Title of the invention: Rolling machine setting method and rolling mill
Technical field
[0001]
　The present invention relates to a rolling mill for rolling a material to be rolled and a method for setting the rolling mill.
Background technology
[0002]
　As a phenomenon that causes sheet passing trouble in the hot rolling process, for example, there is meandering of steel sheets. One of the factors that cause the steel sheet to meander is the thrust force generated by a minute cloth (also referred to as roll skew) between the rolls of the rolling mill, but it is difficult to directly measure the thrust force. Therefore, the thrust reaction force or roll skew angle detected as the reaction force of the total value of the thrust forces generated between the rolls is measured, and the thrust force generated between the rolls based on the thrust reaction force or the roll skew angle It has been proposed to identify and control the meandering of steel sheets.
[0003]
　For example, in Patent Document 1, the thrust reaction force in the roll axis direction and the load in the rolling direction are measured, one or both of the rolling zero and the deformation characteristics of the rolling mill are obtained, and the rolling position is set at the time of rolling. A plate rolling method for rolling control is disclosed. Further, in Patent Document 2, the thrust force generated in the roll is calculated based on the minute cross angle (skew angle) between rolls measured by using the distance sensor provided inside the rolling mill, and based on the thrust force. A meandering control method is disclosed in which a difference load component due to meandering is calculated from a load measurement value in the rolling direction to control meandering leveling. Further, Patent Document 3 discloses a cross point correction device for correcting a deviation of a point (cross point) where the central axes of the upper and lower rolls intersect in the horizontal direction in a pair cross rolling mill. Such a device includes an actuator that absorbs the play generated between the crosshead and the roll chock, and a detector that detects the roll chock position, and corrects the deviation of the cross point based on the roll chock position.
[0004]
　Further, in Patent Document 4, when the load difference between the driving side and the operating side is detected and the meandering of the rolled material is controlled by independently operating the rolling position between the driving side and the operating side based on the detected load difference. By estimating the differential load due to the thrust during rolling, the differential load during rolling is separated into those due to the meandering of the rolled material and those due to the thrust, and the drive is performed based on these separated differential loads. A method of controlling a rolling mill that operates the rolling position on the side and the operating side is disclosed.
Prior art literature
Patent documents
[0005]
Patent Document 1:
Japanese Patent Application Laid-Open No. 3499107 Patent Document 2: Japanese Patent Application Laid-Open No. 2014-4599
Patent Document 3: Japanese Patent Application Laid-Open No. 8-294713
Patent Document 4: Japanese Patent Application Laid-Open No. 4962334
Outline of the invention
Problems to be solved by the invention
[0006]
　However, in the technique described in Patent Document 1, it is necessary to measure the thrust reaction force of a roll other than the reinforcing roll at the time of zero adjustment of the rolling position and during rolling, but when measuring the thrust reaction force during rolling, rolling. Depending on changes in rolling conditions such as load, characteristics such as the point of action of thrust reaction force may change, and asymmetric deformation due to thrust force may not be correctly specified. Therefore, it may not be possible to accurately perform the reduction leveling control.
[0007]
　Further, in the technique described in Patent Document 2, the roll skew angle is obtained from the horizontal distance of the roll measured by a distance sensor such as a whirlpool type. However, the roll vibrates in the horizontal direction due to machining accuracy such as eccentricity or cylindricity of the roll body length part, and the chock position in the horizontal direction fluctuates due to the impact at the time of biting at the start of rolling. It is difficult to accurately measure the horizontal displacement of the roll that causes the occurrence of. Further, the coefficient of friction of the roll changes from moment to moment because the roughness of the roll changes with time as the number of rolled rolls increases. Therefore, it is not possible to accurately calculate the thrust force only from the roll skew angle measurement without identifying the friction coefficient.
[0008]
　Further, in the technique described in Patent Document 3, the cross angle between rolls is caused by the relative cross between rolls, and the roll bearing or the like also has play. Therefore, each roll chock position is individually controlled in the rolling direction. However, the relative positional relationship of the roll itself is not eliminated. Therefore, the thrust force generated by the cross angle between rolls cannot be eliminated.
[0009]
　Further, in the technique described in Patent Document 4, prior to rolling, a bending force is applied while driving the rolls in a state where the upper and lower rolls do not contact, and the bending force is obtained from the load difference between the driving side and the working side generated at that time. The differential load due to thrust is estimated from the thrust coefficient or skew amount. In Patent Document 4, the thrust coefficient or the skew amount is identified only from the measured value in one rotation state of the upper and lower rolls. Therefore, if the zero point of the load detector is displaced or the influence of the frictional resistance between the housing and the roll chock is different on the left and right, a left-right asymmetric error may occur between the measured value on the driving side and the measured value on the working side. is there. In particular, when the load level is small, such as a bending force load, such an error can be a fatal error in identifying the thrust coefficient or skew amount. Further, in Patent Document 4, the thrust coefficient or the skew amount cannot be identified unless the friction coefficient between rolls is given.
[0010]
　Further, in Patent Document 4, the thrust reaction force of the backup roll acts on the position of the roll axis, and the change in the position of the action point of the thrust reaction force is not taken into consideration. Normally, since the chock of the backup roll is supported by a reduction device or the like, the position of the action point of the thrust reaction force is not always located at the roll axis. For this reason, an error occurs in the thrust force between rolls obtained from the load difference between the reduction load on the drive side and the load in the reduction direction on the work side, and the thrust coefficient or skew amount calculated based on the thrust force between rolls also has an error. Occurs.
[0011]
　Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to reduce the thrust force generated between rolls to suppress meandering and camber of the material to be rolled. It is an object of the present invention to provide a new and improved method for setting a rolling mill and a rolling mill.
Means to solve problems
[0012]
　In order to solve the above problems, according to a certain aspect of the present invention, there is a method of setting a rolling mill, wherein the rolling mill includes at least a pair of working rolls and a pair of reinforcing rolls supporting the working rolls. This is a rolling mill having four or more stages and equipped with the above rolls. Roll is a lower roll system, and one of the rolls arranged in the rolling direction is used as a reference roll, and a torque measuring device that measures the torque acting on the work roll by driving a motor that drives the work roll. And, at least on the lower side or the upper side of the rolling mill, rolling is performed on a rolling reduction device provided on the working side and the driving side to measure the rolling load in the rolling direction, and at least a roll chock of a roll other than the reference roll. A pressing device provided on either the entry side or the exit side to press the material to be rolled in the rolling direction, and at least a roll chock of a roll other than the reference roll are provided so as to face the pressing device in the rolling direction. It is equipped with a roll chock drive device that moves the roll chock in the rolling direction of the material to be rolled, and is carried out before the rolling reduction position is adjusted or before the start of rolling, and the roll gap of the working roll is opened to open the upper roll system and the upper roll system. In each of the lower roll systems, in the roll system on the side where the rolling load measuring device is installed, the torque acting on the work roll is measured by the torque measuring device, or the pair of working rolls differs depending on the rolling load measuring device. The rolling load in the two rolling states is measured on the working side and the driving side, respectively, and in the roll system on the side where the rolling load measuring device is not installed, the torque acting on the working roll is measured by the torque measuring device. , The rolling direction position of the roll chock of the reference roll is fixed as the reference position, and based on the torque or the reduction load difference between the reduction load on the working side and the reduction load on the drive side, other than the reference roll By moving the roll chock of the roll by the roll chock driveAfter performing the first step of adjusting the position of the roll chock and the first step, the work roll is put into a kiss roll state, and the rolling load in the rolling direction is loaded by the rolling load measuring device in two different rotating states of the pair of working rolls. Is measured on the work side and the drive side, respectively, and the rolling direction position of the roll chock of the reference roll is fixed as the reference position, and the roll system on the opposite side of the reference roll is set so that the load difference in the reduction direction is within a predetermined allowable range. A method for setting a rolling mill, including a second step of adjusting the position of the roll chock by moving the roll chock of each roll in the same direction at the same time while maintaining the relative position between the roll chock by the roll chock drive device. Is provided.
[0013]
　Here, among the plurality of rolls, the roll located at the bottom or the top in the rolling direction may be used as the reference roll.
[0014]
　Further, in the four-stage rolling mill, when the working rolls are independently driven by different motors, in the first step, the position of the roll chock of the upper roll system and the position of the roll chock of the lower roll system are simultaneously or , Each is adjusted separately, and in the roll system on the side where the rolling load measuring device is installed, the rolling load difference is within a predetermined allowable range, or the torque value is minimized. The position of the roll chock of the roll other than the reference roll is adjusted, and the position of the roll chock of the roll other than the reference roll is adjusted so that the torque value is minimized in the roll system on the side where the rolling reduction load measuring device is not installed. May be done.
[0015]
　Further, in the four-stage rolling mill, when a pair of working rolls are simultaneously driven by one motor, in the first step, the position of the roll chock of the upper roll system and the position of the roll chock of the lower roll system are separated from each other. In the roll system on the side where the rolling down load measuring device is installed, the roll system other than the reference roll is adjusted so that the rolling down load difference is within a predetermined allowable range or the torque value is minimized. In the roll system on the side where the position of the roll chock of the roll is adjusted and the rolling load measuring device is not installed, the position of the roll chock of the roll other than the reference roll may be adjusted so that the torque value becomes the minimum. ..
[0016]
　さらに、圧延機は、上ロール系及び下ロール系にそれぞれ作業ロールと補強ロールとの間に中間ロールを備える６段の圧延機であり、作業ロールがそれぞれ異なるモータにより独立して駆動されるとき、第１工程では、上ロール系及び下ロール系それぞれについて、中間ロールのロールチョックと補強ロールのロールチョックとの位置を調整する第１調整と、第１調整を実施した後、中間ロールのロールチョックと作業ロールのロールチョックとの位置を調整する第２調整と、が実施され、第１調整では、圧下方向荷重測定装置が設置されている側のロール系については、トルクの値が極小となるように、または、圧下方向荷重差が所定の許容範囲内となるように、作業ロールのロールチョックと中間ロールのロールチョックとの位置を当該ロールチョック間の相対位置を保持しながら同時かつ同方向に調整され、または、基準ロールではない補強ロールのロールチョックの位置が調整され、圧下方向荷重測定装置が設置されていない側のロール系については、トルクの値が極小となるように、作業ロールのロールチョックと中間ロールのロールチョックとの位置が当該ロールチョック間の相対位置を保持しながら同時かつ同方向に調整され、または、基準ロールではない補強ロールのロールチョックの位置が調整され、第２調整では、圧下方向荷重測定装置が設置されている側のロール系については、トルクの値が極小となるように、または、圧下方向荷重差が所定の許容範囲内となるように、作業ロールのロールチョックの位置が調整され、または、基準ロールではない補強ロールのロールチョックと中間ロールのロールチョックとの位置を当該ロールチョック間の相対位置を保持しながら同時かつ同方向に調整され、圧下方向荷重測定装置が設置されていない側のロール系については、トルクの値が極小となるように、作業ロールのロールチョックの位がを調整され、または、基準ロールではない補強ロールのロールチョックと中間ロールのロールチョックとの位置が当該ロールチョック間の相対位置を保持しながら同時かつ同方向に調整されてもよい。
[0017]
　また、圧延機は、上ロール系及び下ロール系にそれぞれ作業ロールと補強ロールとの間に中間ロールを備える６段の圧延機であり、一対の作業ロールが１つのモータにより同時に駆動されるとき、第１工程では、上ロール系及び下ロール系それぞれ別個に、中間ロールのロールチョックと補強ロールのロールチョックとの位置を調整する第１調整と、第１調整実施した後、中間ロールのロールチョックと作業ロールのロールチョックとの位置を調整する第２調整と、が実施され、第１調整では、圧下方向荷重測定装置が設置されている側のロール系については、トルクの値が極小となるようにまたは、圧下方向荷重差が所定の許容範囲内となるように、作業ロールのロールチョックと中間ロールのロールチョックとの位置が当該ロールチョック間の相対位置を保持しながら同時かつ同方向に調整され、または、基準ロールではない補強ロールのロールチョックの位置が調整され、圧下方向荷重測定装置が設置されていない側のロール系については、トルクの値が極小となるように、作業ロールのロールチョックと中間ロールのロールチョックとの位置が当該ロールチョック間の相対位置を保持しながら同時かつ同方向に調整され、または、基準ロールではない補強ロールのロールチョックの位置が調整され、第２調整では、圧下方向荷重測定装置が設置されている側のロール系については、トルクの値が極小となるように、または、圧下方向荷重差が所定の許容範囲内となるように、作業ロールのロールチョックの位置が調整される、または、基準ロールではない補強ロールのロールチョックと中間ロールのロールチョックとの位置が当該ロールチョック間の相対位置を保持しながら同時かつ同方向に調整され、圧下方向荷重測定装置が設置されていない側のロール系については、トルクの値が極小となるように、作業ロールのロールチョックの位置が調整され、または、基準ロールではない補強ロールのロールチョックと中間ロールのロールチョックとの位置が当該ロールチョック間の相対位置を保持しながら同時かつ同方向に調整されてもよい。
[0018]
　Further, in order to solve the above problems, according to another aspect of the present invention, a rolling mill having four or more stages including a plurality of rolls including at least a pair of working rolls and a pair of reinforcing rolls supporting the working rolls. A torque measuring device for measuring the torque acting on the working roll by driving a motor for driving the working roll, and at least rolling, using any one of the rolls arranged in the rolling direction as a reference roll. On the lower or upper side of the machine, with respect to a rolling load measuring device provided on the working side and the driving side to measure the rolling load in the rolling direction, and at least a roll chock of a roll other than the reference roll, the rolling direction entry side or A pressing device provided on either one of the exit sides to press the material to be rolled in the rolling direction and a roll chock of a roll other than the reference roll are provided so as to face the pressing device in the rolling direction, and the roll chock is covered. The roll chock drive device that moves the rolled material in the rolling direction and the rolling direction position of the roll chock of the reference roll are fixed as the reference position, and the rolling force is the difference between the torque and the rolling direction load on the working side and the rolling direction load on the driving side. Provided is a rolling mill comprising a roll chock position control device that controls a roll chock drive device based on a directional load difference and adjusts a position of a roll chock other than a reference roll in a rolling direction.
[0019]
　The upper work roll and the lower work roll may be driven vertically independently by different motors.
[0020]
　Alternatively, the upper work roll and the lower work roll may be driven up and down at the same time by one motor.
The invention's effect
[0021]
　As described above, according to the present invention, it is possible to reduce the thrust force generated between the rolls and suppress the occurrence of meandering and camber of the material to be rolled.
A brief description of the drawing
[0022]
FIG. 1A is a schematic side view and a schematic front view of the rolling mill for explaining the thrust force and the thrust reaction force generated between the rolls of the rolling mill during rolling.
FIG. 1B is a flowchart illustrating an outline of a method for setting a rolling mill according to each embodiment of the present invention.
FIG. 2 is an explanatory diagram showing a configuration of a rolling mill according to the first embodiment of the present invention and an apparatus for controlling the rolling mill.
FIG. 3A is a flowchart illustrating a method of setting a rolling mill according to the same embodiment.
FIG. 3B is a flowchart illustrating a method of setting a rolling mill according to the same embodiment.
FIG. 4A is an explanatory view showing a procedure of roll position adjustment in the setting method of the rolling mill shown in FIGS. 3A and 3B, and shows the first adjustment.
FIG. 4B is an explanatory view showing a procedure of roll position adjustment in the setting method of the rolling mill shown in FIGS. 3A and 3B, and shows the second adjustment.
FIG. 5 is an explanatory diagram showing a configuration of a rolling mill according to a second embodiment of the present invention and an apparatus for controlling the rolling mill.
FIG. 6A is a flowchart illustrating a method of setting a rolling mill according to the same embodiment.
FIG. 6B is a flowchart illustrating a method of setting a rolling mill according to the same embodiment.
FIG. 6C is a flowchart illustrating a method of setting a rolling mill according to the same embodiment.
7A is an explanatory view showing a procedure of roll position adjustment in the setting method of the rolling mill shown in FIGS. 6A to 6C, and shows the first adjustment.
7B is an explanatory view showing a procedure of roll position adjustment in the setting method of the rolling mill shown in FIGS. 6A to 6C, and shows the second adjustment.
FIG. 7C is an explanatory view showing a procedure of roll position adjustment in the setting method of the rolling mill shown in FIGS. 6A to 6C, and shows a third adjustment.
FIG. 8 is a schematic side view and a schematic front view showing an example of a state in which a thrust force between rolls of a rolling mill is generated when a cross angle between rolls is changed.
FIG. 9 is an explanatory view showing the difference in rolling load obtained in the rolling mill in the state of FIG. 8 when the lower roll is rotated forward and when it is reversed.
FIG. 10 is an explanatory diagram showing a difference in rolling load obtained in the rolling mill in the state of FIG. 8 when the lower roll is stopped and when the lower roll is rotated.
FIG. 11 is an explanatory view showing the arrangement of working rolls and reinforcing rolls in a rolling mill with an open roll gap.
FIG. 12 is an explanatory diagram showing a definition of a cross angle between rolls.
FIG. 13 is a graph showing a relationship between a working roll cross angle, a load difference in the reduction direction, a motor torque, and a spindle torque when the roll gap is open.
FIG. 14A is an explanatory diagram showing a mechanism in which a relationship between the inter-roll cross angle shown in FIG. 13 and various values ​​occurs, and shows a case where there is no inter-roll cross angle.
FIG. 14B is an explanatory diagram showing a mechanism in which a relationship between the inter-roll cross angle shown in FIG. 13 and various values ​​occurs, and shows a case where there is an inter-roll cross angle.
FIG. 15 is an explanatory view showing the arrangement of working rolls and reinforcing rolls of a rolling mill in a kiss roll state.
FIG. 16 is a graph showing one relationship between the pair cross angle between the work roll and the reinforcing roll and the load difference in the reduction direction in the kiss roll state.
FIG. 17A is an explanatory diagram showing a procedure for adjusting the roll position when the setting method of the rolling mill shown in FIGS. 4A and 4B is applied to the 6-stage rolling mill, and shows the first adjustment.
FIG. 17B is an explanatory diagram showing a procedure for adjusting the roll position when the setting method of the rolling mill shown in FIGS. 4A and 4B is applied to the 6-stage rolling mill, and shows the second adjustment.
FIG. 17C is an explanatory diagram showing a procedure for adjusting the roll position when the setting method of the rolling mill shown in FIGS. 4A and 4B is applied to the 6-stage rolling mill, and shows the third adjustment.
FIG. 18A is an explanatory diagram showing a procedure for adjusting the roll position when the setting method of the rolling mill shown in FIGS. 7A to 7C is applied to the 6-stage rolling mill, and the adjustment of the upper roll system in the first adjustment is performed. Shown.
FIG. 18B is an explanatory diagram showing a procedure for adjusting the roll position when the setting method of the rolling mill shown in FIGS. 7A to 7C is applied to the 6-stage rolling mill, and the adjustment of the lower roll system in the first adjustment is performed. Shown.
FIG. 18C is an explanatory diagram showing a procedure for adjusting the roll position when the setting method of the rolling mill shown in FIGS. 7A to 7C is applied to the 6-stage rolling mill, and the adjustment of the upper roll system in the second adjustment is performed. Shown.
FIG. 18D is an explanatory diagram showing a procedure for adjusting the roll position when the setting method of the rolling mill shown in FIGS. 7A to 7C is applied to the 6-stage rolling mill, and the adjustment of the lower roll system in the second adjustment is performed. Shown.
FIG. 18E is an explanatory diagram showing a procedure for adjusting the roll position when the setting method of the rolling mill shown in FIGS. 7A to 7C is applied to the 6-stage rolling mill, and shows the third adjustment.
Mode for carrying out the invention
[0023]
　Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the present specification and the drawings, components having substantially the same functional configuration are designated by the same reference numerals, so that duplicate description will be omitted.
[0024]
　<1. Objective> In the
　rolling mill according to the embodiment of the present invention and the method for setting the rolling mill, the thrust force generated between the rolls is eliminated, and a product having no meandering and camber or having extremely slight meandering and camber can be stably manufactured. The purpose is to make it possible. FIG. 1A shows a schematic side view and a schematic front view of the rolling mill for explaining the thrust force and the thrust reaction force generated between the rolls of the rolling mill when the material S to be rolled is rolled. In the following, as shown in FIG. 1A, the working side in the roll body length direction is referred to as WS (Work Side), and the driving side is referred to as DS (Drive Side).
[0025]
　The rolling mill shown in FIG. 1A has a pair of working rolls including an upper working roll 1 and a lower working roll 2, and an upper reinforcing roll 3 and a lower working roll 2 that support the upper working roll 1 in the rolling direction (Z direction). It has a pair of reinforcing rolls including a supporting lower reinforcing roll 4. The upper work roll 1 is supported by the upper work roll chock 5a on the work side and the upper work roll chock 5b on the drive side. The lower work roll 2 is supported by a lower work roll chock 6a on the work side and a lower work roll chock 6b on the drive side. Similarly, the upper reinforcing roll 3 is supported by the upper reinforcing roll chock 7a on the working side and the upper reinforcing roll chock 7b on the driving side. The lower reinforcing roll 4 is supported by a lower reinforcing roll chock 8a on the working side and a lower reinforcing roll chock 8b on the driving side.
[0026]
　The upper work roll 1, the lower work roll 2, the upper reinforcing roll 3 and the lower reinforcing roll 4 are arranged so that the body length directions of the rolls are parallel to each other so as to be orthogonal to the conveying direction of the material S to be rolled. At this time, the roll slightly rotates around an axis (Z axis) parallel to the reduction direction, and the upper work roll 1 and the upper reinforcement roll 3 are displaced in the body length direction, or the lower work roll 2 and the lower reinforcement roll 4 When a deviation in the body length direction occurs, a thrust force acting in the body length direction of the roll is generated between the work roll and the reinforcing roll. The inter-roll thrust force causes an extra moment in the roll, which causes asymmetric roll deformation. This asymmetric roll deformation contributes to the instability of rolling, causing, for example, meandering or cambering. This inter-roll thrust force is generated when the work roll and the reinforcing roll are displaced in the roll body length direction and a cross angle between the rolls is generated. For example, it is assumed that a cross angle between rolls is generated between the lower work roll 2 and the lower reinforcing roll 4. At this time, a thrust force is generated between the lower working roll 2 and the lower reinforcing roll 4, and as a result, a moment is generated in the lower reinforcing roll 4, and the load distribution between the rolls changes so as to be balanced with this moment. However, asymmetric roll deformation occurs. This asymmetrical roll deformation causes meandering or camber, and the rolling becomes unstable.
[0027]
　In the present invention, in rolling the material to be rolled by the rolling mill, the rolling mill setting method described below is carried out before the rolling reduction position zero point is adjusted or before the rolling is started so that the thrust force between the rolls generated is eliminated. Then adjust the roll chock position of each roll. The purpose of this is to make it possible to stably manufacture a product without meandering and camber, or with extremely little meandering and camber.
[0028]
　FIG. 1B shows a flowchart illustrating an outline of a method for setting a rolling mill according to each embodiment of the present invention described later. Here, in a rolling mill in which the roll chock position is adjusted, a plurality of rolls provided on the upper side in the rolling direction with respect to the material to be rolled are used as an upper roll system, and a plurality of rolls provided on the lower side in the rolling direction with respect to the material to be rolled. The roll of is the lower roll system. Further, any one of the rolls arranged in the rolling direction is set as the reference roll.
[0029]
　As shown in FIG. 1B, in the setting of the rolling mill, first, as the first step, the roll gap of the working roll is opened, and the inter-roll thrust force generated between the rolls in each of the upper roll system and the lower roll system is established. The roll chock position of each roll is adjusted so that there is no such thing (S10). At this time, the roll chock position where the cross angle between the rolls does not occur is specified from the change in the torque acting on the work roll by driving the motor that drives the work roll. Here, the "torque" measured to specify the roll chock position may be the motor torque specified based on the motor current value, and is one of the components for transmitting the rotation of the motor to the work roll. The spindle torque may be measured by attaching a sensor such as a strain gauge to the spindle. When the term "torque" is simply used in the following description, it means motor torque or spindle torque.
[0030]
　If it is possible to measure the reduction direction load in the reduction direction by the reduction direction load measuring device on the work side and the drive side of the rolling mill, the reduction direction load on the work side and the reduction direction load on the drive side It is also possible to specify the roll chock position where the cross angle between rolls does not occur based on the difference in the load in the reduction direction, which is the difference. In the first step, in each of the upper roll system and the lower roll system, adjustments are made to eliminate the cross angle between the rolls generated between the plurality of rolls constituting the roll system.
[0031]
　After the first step is carried out, as the second step, the working rolls are put into a kiss roll state, and adjustments are made to eliminate the cross angle between the rolls in the entire upper roll system and the lower roll system (S20). In the second step, the rolling direction position of the roll chock of the reference roll is fixed as the reference position, and the load difference in the rolling direction in the two different rotation states of the pair of working rolls is within a predetermined allowable range, which is opposite to the reference roll. The roll chock position of each roll of the roll system on the side is adjusted. At this time, the roll chock of the roll system to be adjusted is moved by the roll chock drive device at the same time and in the same direction while maintaining the relative position between the roll chock. As a result, the roll chock position as a whole can be adjusted without breaking the positional relationship of the roll chock adjusted in the first step.
[0032]
　Hereinafter, the configuration of the rolling mill according to each embodiment of the present invention and the setting method of the rolling mill will be described in detail.
[0033]
　<2. First Embodiment>
　Based on FIGS. 2 to 4, the configuration of the rolling mill according to the first embodiment of the present invention, the apparatus for controlling the rolling mill, and the setting method of the rolling mill will be described. In the first embodiment, before adjusting the zero point of the rolling position or before starting rolling, the position of the roll chock is adjusted so that the cross angle between the rolls of the reference reinforcing roll and the other roll is zero, and a thrust force is generated. It realizes rolling without rolling.
[0034]
　[2-1. Configuration of Rolling Machine]
　First, a rolling machine according to the present embodiment and an apparatus for controlling the rolling machine will be described with reference to FIG. FIG. 2 is an explanatory diagram showing a configuration of a rolling mill according to the present embodiment and an apparatus for controlling the rolling mill. It is assumed that the rolling mill shown in FIG. 2 shows a state seen from the working side in the roll body length direction. Further, FIG. 2 shows a configuration when the lower reinforcing roll is used as a reference roll. The reference roll is preferably a roll located at the bottom or top where the contact area between the chock and the housing is large and the position is stable.
[0035]
　The rolling mill shown in FIG. 2 is a four-stage rolling mill having a pair of working rolls 1 and 2 and a pair of reinforcing rolls 3 and 4 supporting the rolling mills 1 and 2. As shown in FIG. 1A, the upper work roll 1 is supported by the upper work roll chock 5a and 5b, and the lower work roll 2 is supported by the lower work roll chock 6a and 6b. Although FIG. 2 shows only the upper work roll chock 5a and the lower work roll chock 6a on the work side, as shown in FIG. 1A, the upper work roll chock 5b and the lower work roll chock 6b are on the drive side on the back side of the paper in FIG. Is provided.
[0036]
　The upper work roll 1 is rotationally driven by the upper drive motor 21a, and the lower work roll 2 is rotationally driven by the lower drive motor 21b. That is, the upper work roll 1 and the lower work roll 2 are configured to be independently rotatable. The upper drive electric motor 21a and the lower drive electric motor 21b are, for example, motors, and the spindles thereof are provided with spindle torque measuring devices 31a and 31b for measuring the spindle torque, respectively. The spindle torque measuring devices 31a and 31b are, for example, load cells. The upper spindle torque measuring device 31a provided in the upper driving electric motor 21a measures the spindle torque of the upper driving electric motor 21a and outputs the spindle torque to the inter-roll cross control device 23 described later. Similarly, the lower spindle torque measuring device 31b provided in the lower drive electric motor 21b measures the spindle torque of the lower drive electric motor 21b and outputs the spindle torque to the inter-roll cross control device 23 described later.
[0037]
　The upper reinforcing roll 3 is supported by the upper reinforcing roll chock 7a, 7b, and the lower reinforcing roll 4 is supported by the lower reinforcing roll chock 8a, 8b. The upper reinforcing roll chock 7a, 7b and the lower reinforcing roll chock 8a, 8b are also provided on the back side (driving side) of FIG. 2 as shown in FIG. 1A, and the upper reinforcing roll 3 and the lower reinforcing roll 4 are provided, respectively. Supports. The upper working roll chock 5a and 5b, the lower working roll chock 6a and 6b, the upper reinforcing roll chock 7a and 7b, and the lower reinforcing roll chock 8a and 8b are held by the housing 30.
[0038]
　The upper work roll chock 5a and 5b are provided on the rolling direction entry side and are provided on the upper work roll chock pressing device 9 for pressing the upper work roll chock 5a and 5b in the rolling direction, and are provided on the rolling direction exit side to determine the position in the rolling direction. An upper work roll chock drive device 11 that detects and drives the upper work roll chock 5a and 5b in the rolling direction is provided. The upper work roll chock drive device 11 includes a position detecting device for detecting the position of the upper work roll chock. Similarly, the lower work roll chock 6a, 6b is provided on the lower work roll chock pressing device 10 provided on the rolling direction entry side and presses the lower work roll chock 6a, 6b in the rolling direction, and is provided on the rolling direction exit side, and is provided in the rolling direction. A lower work roll chock driving device 12 is provided which detects the position of the lower working roll chock 6a and 6b and drives the lower working roll chock 6a and 6b in the rolling direction. The lower work roll chock drive device 12 includes a position detection device that detects the position of the lower work roll chock.
[0039]
　For example, a hydraulic cylinder is used as the drive mechanism of the upper work roll chock drive device 11, the lower work roll chock drive device 12, the upper work roll chock pressing device 9, and the lower work roll chock pressing device 10. In FIG. 2, the upper and lower work roll chock drive devices 11 and 12 and the upper and lower work roll chock pressing devices 9 and 10 are displayed only on the work side, but are also provided on the back side (drive side) of the paper. Has been done.
[0040]
　The upper reinforcing roll chocks 7a and 7b are provided with an upper reinforcing roll chock pressing device 13 provided on the outside in the rolling direction to press the upper reinforcing roll chocks 7a and 7b in the rolling direction, and an upper reinforcing roll chock pressing device 13 provided on the inward side in the rolling direction to determine the position in the rolling direction. An upper reinforcing roll chock driving device 14 that detects and drives the upper reinforcing roll chock 7a and 7b in the rolling direction is provided. The upper reinforcing roll chock driving device 14 includes a position detecting device for detecting the position of the upper reinforcing roll chock. For example, a hydraulic cylinder is used as the drive mechanism of the upper reinforcement roll chock drive device 14 and the upper reinforcement roll chock pressing device 13. In FIG. 2, the upper reinforcing roll chock driving device 14 and the upper reinforcing roll chock pressing device 13 display only the working side, but are also provided on the back side (driving side) of the paper surface.
[0041]
　On the other hand, since the lower reinforcing roll chock 8a and 8b use the lower reinforcing roll 4 as the reference roll in the present embodiment, they are the reference reinforcing roll chock. Therefore, since the lower reinforcing roll chock 8 is not driven to adjust the position, it is not always necessary to provide the roll chock driving device and the position detecting device like the upper reinforcing roll chock 7a and 7b. However, in order to prevent the position of the reference reinforcing roll chock used as the reference for position adjustment from changing, for example, a lower reinforcing roll chock pressing device 40 or the like is provided on the entry side or the exit side in the rolling direction to suppress the rattling of the lower reinforcing roll chock 8a and 8b. You may do so. In FIG. 2, the lower reinforcing roll chock pressing device 40 displays only the working side, but is also provided on the back side (driving side) of the paper surface.
[0042]
　The reduction device 50 is provided between the housing 30 and the upper reinforcing roll chocks 7a and 7b, and adjusts the roll position in the reduction direction. Between the reduction device 50 and the upper reinforcement roll chock 7a, 7b, an upper reduction downward load measuring device 71 for measuring the reduction direction load applied to the upper reinforcement roll chock 7a, 7b is provided. In FIG. 2, the reduction device 50 and the upper reduction downward load measuring device 71 show only the working side, but are also provided on the back side (driving side) of the paper surface. Further, in the present embodiment, the downward load is measured by installing the upward and downward load measuring device 71 on the upper side of the rolling mill, but the present invention is not limited to this example, and the lower side of the rolling mill (that is, that is, , A reduction direction load measuring device may be provided between the housing 30 and the lower reinforcing roll chocks 8a and 8b) for measurement.
[0043]
　The rolling mill according to the present embodiment includes an inlet upper incremental bending device 61a and an outgoing upper incremental bending device 61b in a project block between the upper working roll chock 5a and 5b and the housing 30, and the lower working roll chock 6a, The project block between 6b and the housing 30 is provided with an inlet lower incremental bending device 62a and an outer lower incremental bending device 62b. Further, although not shown, on the back side (driving side) of FIG. 2, the entry side upper ink lease bending device 61c, the exit side upper ink lease bending device 61d, the inlet lower ink lease bending device 62c, and the exit A lower side increase bending device 62d is similarly provided. Each incremental bending device applies an incremental bending force for applying a load to the upper working roll 1 and the upper reinforcing roll 3, the lower working roll 2 and the lower reinforcing roll 4 to the working roll chock. As these incremental bending devices, those usually used for bending the upper and lower working rolls to adjust the roll crown may be used.
[0044]
　As devices for controlling the rolling mill, for example, as shown in FIG. 2, a roll chock rolling direction force control device 15, a roll chock position control device 16, a drive electric motor control device 22, a roll-to-roll cross control device 23, and the like. It has a roll bending control device 63.
[0045]
　The roll chock rolling direction force control device 15 controls the pressing force in the rolling direction of the upper work roll chock pressing device 9, the lower working roll chock pressing device 10, the upper reinforcing roll chock pressing device 13, and the lower reinforcing roll chock pressing device 40. The roll chock rolling direction force control device 15 drives and controls the upper work roll chock pressing device 9, the lower working roll chock pressing device 10, and the upper reinforcing roll chock pressing device 13 based on the control instruction of the inter-roll cross control device 23 described later. A state in which the roll chock position can be controlled is formed by applying a predetermined pressing force corresponding to the target roll chock.
[0046]
　The roll chock position control device 16 controls the drive of the upper work roll chock drive device 11, the lower work roll chock drive device 12, and the upper reinforcement roll chock drive device 14. The roll chock position control device 16 is based on the control instruction of the inter-roll cross control device 23 so that the load difference in the reduction direction is within a predetermined range or the torque is minimized. The work roll chock drive device 12 and the upper reinforcing roll chock drive device 14 are driven. The roll chock drive devices 11, 12, and 14 are arranged on both the work side and the drive side, and the same amount is controlled in the opposite directions on the work side and the drive side with respect to the positions of the work side and the drive side in the rolling direction. By doing so, only the roll cross angle can be changed without changing the average rolling direction positions on the working side and the driving side.
[0047]
　The drive motor control device 22 controls the upper drive motor 21a that rotationally drives the upper work roll 1 and the lower drive motor 21b that rotationally drives the lower work roll 2. The drive motor control device 22 according to the present embodiment drives the upper drive motor 21a and the lower drive motor 21b based on the instruction from the inter-roll cross control device 23, and the upper work roll 1 or the lower work roll 2 Control the drive.
[0048]
　The inter-roll cross control device 23 positions the roll chocks of the upper working roll 1, the lower working roll 2, the upper reinforcing roll 3, and the lower reinforcing roll 4 constituting the rolling mill so that the inter-roll cross angle becomes zero. The position of each roll is controlled by adjusting. In the rolling mill according to the present embodiment, the spindle torque of the upper drive electric motor 21a measured by the upper spindle torque measuring device 31a, the spindle torque of the lower drive electric motor 21b measured by the lower spindle torque measuring device 31b, and the upper The position of the roll chock is adjusted based on the difference between the reduction direction load on the working side and the reduction direction load on the drive side (hereinafter, also referred to as “reduction direction load difference”) measured by the reduction direction load measuring device 71. Based on these measured values, the inter-roll cross control device 23 gives a control instruction to the roll chock rolling direction force control device 15, the roll chock position control device 16, and the drive electric motor control device 22, and is generated between the rolls. Make sure there are no crosses. The details of the setting method of the rolling mill will be described later.
[0049]
　The roll bending control device 63 is a device that controls the incremental bending devices 61a to 61d and 62a to 62d. Based on the instruction from the inter-roll cross control device 23, the roll bending control device 63 according to the present embodiment controls the increase bending device so as to give an increase bending force to the work roll chock. The roll bending control device 63 may be used not only when adjusting the inter-roll cloth according to the present embodiment, but also when, for example, performing crown control or shape control of the material to be rolled.
[0050]
　The configuration of the rolling mill according to the present embodiment has been described above. In FIG. 2, regarding the working roll chocks 5a, 5b, 6a, and 6b, the roll chock driving devices 11 and 12 are on the outlet side of the rolling mill, the pressing devices 9 and 10 are on the inlet side, and the reinforcing roll chock 7a, 7b, 8a, 8b. Has described an example in which a roll chock driving device 14 is provided on the entrance side of the rolling mill and a pressing device 13 is provided on the exit side, but the present invention is not limited to this example. For example, these arrangements may be installed in reverse on the entry side and the exit side of the rolling mill, or may be installed in the same direction by the working roll and the reinforcing roll. Further, although the roll chock driving devices 11, 12, and 14 are arranged on both the working side and the driving side and the position control of each is described, the present invention is not limited to such an example. It is possible to control the roll cross angle by arranging these devices on only one side of the work side and the drive side, or by operating only one side and controlling the position with the other side as a fulcrum of rotation. Needless to say, the same effect of reducing the cross between rolls can be obtained.
[0051]
　Further, in the above description, an example in which the roll chock driving device is arranged on the working side and the driving side other than the reference roll has been described, but the present invention is not limited to such an example. For example, the roll chock drive device may be arranged in all rolls, the reference roll may be changed according to the situation, and control may be performed based on the changed reference roll. Alternatively, the cross angle between rolls may be similarly controlled by arranging the roll chock drive device on either the working side or the drive side and controlling only the roll chock position on one side with the opposite side as the turning axis.
[0052]
　[2-2. Setting method of rolling mill] The setting method of the rolling mill
　according to the present embodiment will be described with reference to FIGS. 3A to 4B. 3A and 3B are flowcharts for explaining the setting method of the rolling mill according to the present embodiment. 4A and 4B are explanatory views showing a procedure for adjusting the roll position in the method for setting the rolling mill according to the present embodiment. In addition, in FIG. 4A and FIG. 4B, the description of the load distribution acting between the rolls is omitted.
[0053]
　In this example, the lower reinforcing roll 4 is described as a reference roll, but the upper reinforcing roll 3 may be a reference roll. As the reference roll, any one of the rolls constituting the rolling mill may be set, and it is preferable to use either one of the uppermost roll or the lowermost roll in the rolling direction as the reference roll. For example, when the upper reinforcing roll 3 is used as the reference roll, the roll farthest from the reference roll (upper reinforcing roll 3) (lower reinforcing roll 4) and the second farthest roll (lower working roll) are performed in the same procedure as follows. Position adjustment with 2), position adjustment between these two rolls and the third farthest roll (upper work roll 1), and position adjustment between these three rolls and the reference roll, which is the opposite of the reference roll. The position of the roll may be adjusted in order from the roll system on the side. In the present invention, the "roll system" means a roll group composed of a plurality of rolls.
[0054]
(First Adjustment: S100 to S110) The first adjustment according to the
　present embodiment corresponds to the first step shown in FIG. 1B. In the first adjustment, as shown in FIG. 3A, first, the inter-roll cross control device 23 is in an open state in which the roll gap between the upper work roll 1 and the lower work roll 2 has a predetermined gap with respect to the reduction device 50. The roll position in the rolling direction is adjusted so as to be (S100). Based on the instruction, the reduction device 50 sets the increase bending force in a balanced state and opens the roll gaps of the working rolls 1 and 2. Here, the balanced state means a state in which a bending force that lifts the weight of the work roll, roll chock, etc. is applied, and the load acting between the work roll and the reinforcing roll is almost zero. It means that there is.
[0055]
　Further, the inter-roll cross control device 23 loads a predetermined oil lease bending force on the work roll chocks 5a, 5b, 6 from the balanced state by the oil lease bending devices 61a to 61d and 62a to 62d with respect to the roll bending control device 63. Instruct to do (S102). The roll bending control device 63 controls the incremental bending devices 61a to 61d and 62a to 62d based on the instruction, and applies a predetermined incremental bending force to the working roll chocks 5a, 5b, and 6. As a result, the roll gap between the working rolls is opened. Either step S100 or step S102 may be executed first.
[0056]
　Next, the inter-roll cross control device 23 drives the upper drive motor 21a and the lower drive motor 21b with respect to the drive motor control device 22. By driving the upper drive motor 21a and the lower drive motor 21b, the work rolls 1 and 2 rotate at a predetermined rotation speed (S104).
[0057]
　Next, the position of each roll is adjusted stepwise. At this time, the rolling direction position of the roll chock of the reference roll is fixed as the reference position, and the position of the roll chock of the roll other than the reference roll in the rolling direction is moved to adjust the position of the roll chock.
[0058]
　Specifically, the upper roll system composed of the upper work roll 1 and the upper reinforcement roll 3 and the lower roll system composed of the lower work roll 2 and the lower reinforcement roll 4 are measured by the spindle torque measuring devices 31a and 31b, respectively. Adjust the position of the roll chock so that the spindle torque becomes the minimum value. This is based on the finding that the spindle torque becomes the minimum value when the cross angle between the work roll and the reinforcing roll is zero when the work roll is in the open state. Therefore, in the first adjustment, the spindle torque measurement (S106) by the spindle torque measuring devices 31a and 31b and the drive of the roll chock position (S108) are repeatedly performed, and the spindle torque is minimized for each of the upper roll system and the lower roll system. The roll chock position is specified (S110).
[0059]
　The drive of the roll chock position in step S108 is targeted at the roll chock of a roll other than the reference roll. That is, for the upper roll system, the spindle torque may be measured by changing the positions of the upper working roll chocks 5a and 5b as shown in the upper side of FIG. 4A (P11), and as shown in the lower side of FIG. 4A, the upper roll system may be measured. The spindle torque may be measured by changing the position of the reinforcing roll chock (P13). On the other hand, regarding the lower roll system, since the lower reinforcing roll 4 is a reference roll, the lower reinforcing roll chocks 8a and 8b are not moved, and the positions of the lower working roll chocks 6a and 6b are changed as shown in the upper and lower sides of FIG. And measure the spindle torque (12, P14). The inter-roll cross control device 23 ends the first adjustment when the roll chock position when the spindle torque becomes the minimum is specified from the measurement results of the spindle torque by the spindle torque measuring devices 31a and 31b.
[0060]
(Second Adjustment: S112 to S126)
　Next, as shown in FIGS. 3B and 4B, the inter-roll cross control device 23 adjusts the inter-roll cross between the upper roll system and the lower roll system as the second adjustment. The second adjustment according to the present embodiment corresponds to the second step shown in FIG. 1B. First, the inter-roll cross control device 23 causes the reduction device 50 to adjust the roll position in the reduction direction so that the upper work roll 1 and the lower work roll 2 are in a predetermined kiss roll state (S112). The reduction device 50 applies a predetermined load to the rolls based on the instruction, and brings the work rolls 1 and 2 into contact with each other to bring them into a kiss roll state.
[0061]
　Next, the inter-roll cross control device 23 drives the drive motors 21a and 21b by the drive motor control device 22 to rotate the upper work roll 1 and the lower work roll 2 in a predetermined rotation direction at a predetermined rotation speed. (S114, P15 of FIG. 4B). The rotation of the upper work roll 1 and the lower work roll 2 of step S114 is set to normal rotation. Then, when the reduction direction load on the work side and the drive side at the time of normal rotation is measured by the reduction direction load measuring device 71 and input to the roll-to-roll cross control device 23, the roll-to-roll cross control device 23 is reduced by the work side. The difference between the directional load and the reduction load on the drive side is calculated and set as a reference value for the reduction load difference (S116).
[0062]
　The reference value of the load difference in the reduction direction set in step S116 does not have to be the value at the time of normal rotation of the work roll. For example, as shown in the upper right of FIG. 4B, the upper work roll 1 and the lower work roll 2 are stopped. It may be set based on the reduction load on the working side and the driving side measured in the state of being in the state. In this case, the process of step S114 is omitted, and the process of step S116 is executed while the upper work roll 1 and the lower work roll 2 are stopped.
[0063]
　When the reference value of the load difference in the reduction direction is set in step S116, the inter-roll cross control device 23 controls the drive of the drive motors 21a and 21b by the drive motor control device 22, and the upper work roll 1 and The lower work roll 2 is rotated at a predetermined rotation speed in the direction opposite to that of step S114 (S118, P16 in FIG. 4B). The rotation of the upper work roll 1 and the lower work roll 2 of step S118 is reversed.
[0064]
　When the reduction direction load on the work side and the drive side at the time of reversal measured by the reduction direction load measuring device 71 is input, the inter-roll cross control device 23 receives the reduction direction load on the work side and the reduction direction load on the drive side. The difference is taken and the load difference in the reduction direction is calculated. Then, the inter-roll cross control device 23 calculates a control target value from the deviation between the calculated reduction load difference and the reference value calculated in step S116 (S119). The control target value may be, for example, half the deviation of the reference value by utilizing the characteristic that the absolute value of the load difference in the rolling direction due to the thrust force between the rolls during normal rotation and reverse rotation is substantially the same.
[0065]
　Further, when the inter-roll cross control device 23 calculates the reduction direction load difference at the time of work roll reversal (S120), the inter-roll cross control device 23 controls the reduction direction load difference set in step S116. The positions of the roll chocks of the working roll and the reinforcing roll on the opposite side of the reference roll are controlled so as to reach the target value (S122). In the example shown in FIG. 4B, since the lower reinforcing roll 4 is the reference roll, the positions of the upper working roll chocks 5a and 5b and the upper reinforcing roll chocks 7a and 7b are controlled. At this time, since the cross angle of the upper roll system has been adjusted, the upper work roll 1 and the upper reinforcement roll 3 are simultaneously held while maintaining the relative positions of the upper work roll chocks 5a and 5b and the upper reinforcement roll chocks 7a and 7b. The positions of the upper working roll chocks 5a and 5b and the upper reinforcing roll chocks 7a and 7b are adjusted so as to move in the same direction.
[0066]
　The processes of steps S120 to S124 are repeatedly executed until it is determined in step S124 that the reduction load difference has reached the control target value. The reduction load difference does not have to completely match the control target value, and if the difference between these values ​​is within the allowable range, the roll-to-roll cross control device 23 uses the reduction load difference as the control target value. It may be determined that the product has been used. Then, when it is determined that the load difference in the reduction direction has reached the control target value, the roll-to-roll cross control device 23 has a roll gap between the upper work roll 1 and the lower work roll 2 with respect to the reduction device 50. It is adjusted so as to be (S126). After that, rolling of the material to be rolled by the rolling mill is started.
[0067]
　The method of setting the rolling mill and the rolling mill according to the first embodiment of the present invention has been described above. According to the present embodiment, utilizing the characteristic that the spindle torque changes with the change of the cross angle, in the first adjustment, the upper roll system and the lower roll system are based on the spindle torques of the upper work roll and the lower work roll. Adjust the cross angle between the work roll and the reinforcing roll. In the second adjustment, the work roll is put into the kiss roll state, and the cross angle between the upper work roll and the lower work roll is adjusted based on the load difference in the reduction direction. In the kiss roll state, the close force due to the roll profile affects between the upper work roll and the lower work roll, so the load difference in the reduction direction is used instead of the spindle torque. By setting the rolling mill in this way, the thrust force generated between the rolls can be reduced by the cross angle between the rolls, and the meandering and camber of the material to be rolled during rolling can be suppressed.
[0068]
　In the above description, in the first adjustment, the roll chock position is adjusted based on the spindle torques of the upper work roll and the lower work roll, but the present invention is not limited to this example, and for example, the motors of the drive motors 21a and 21b. The rolling mill can be set in the same manner by using torque. Since the motor torque is proportional to the current values ​​of the drive motors 21a and 21b, the roll chock position can be adjusted as the motor torque value based on the current values ​​of the drive motors 21a and 21b.
[0069]
　In the first adjustment, the roll chock position of the upper work roll and the lower work roll was adjusted based on the torque, but at least for the roll system on the side where the reduction load measuring device is not installed, the roll chock position is adjusted based on the torque. do it. For the roll system on the side where the reduction direction load measuring device is installed, the position of the roll chock may be adjusted so that the reduction direction load difference is within a predetermined allowable range. Here, the predetermined allowable range is a range that is equal to or less than the control target value of the reduction load difference calculated based on the reference value obtained in the roll rotation state or the roll stop state, which is opposite to the adjustment of the roll chock position, for example. May be. The predetermined allowable range does not have to completely match the range determined in this way, and may be slightly different.
[0070]
　<3. Second Embodiment>
　Next, based on FIGS. 5 to 7C, the configuration of the rolling mill according to the second embodiment of the present invention, the apparatus for controlling the rolling mill, and the setting method of the rolling mill. explain. The rolling mill according to the second embodiment is a so-called single drive mill, and the upper work roll 1 and the lower work roll 2 are driven by one drive electric motor 21 via a pinion stand (not shown) or the like. To. Therefore, when adjusting the roll chock position based on the motor torque, only one of the upper roll system and the lower roll system can be adjusted. Hereinafter, the configuration of the rolling mill according to the present embodiment and the setting method thereof will be described in detail.
[0071]
　[3-1. Configuration of Rolling Machine]
　First, the rolling mill according to the present embodiment and the apparatus for controlling the rolling mill will be described with reference to FIG. FIG. 5 is an explanatory diagram showing a configuration of a rolling mill according to the present embodiment and an apparatus for controlling the rolling mill. The rolling mill shown in FIG. 5 shows a state seen from the working side in the roll body length direction, and shows a configuration when the lower reinforcing roll is used as a reference roll.
[0072]
　The rolling mill according to the present embodiment shown in FIG. 5 is a four-stage rolling mill having a pair of working rolls 1 and 2 and a pair of reinforcing rolls 3 and 4 supporting the rolling mills 1 and 2. Compared with the rolling mill of the first embodiment shown in FIG. 2, the rolling mill according to the present embodiment has one drive electric motor 21 for the upper work roll 1 and the lower work roll 2 via a pinion stand or the like. The difference is that the motor is driven by the rolling mill, the spindle torque measuring device is not provided, and the down pressure down load measuring device 73 is installed on the lower side of the rolling mill instead of the up pressure down load measuring device 71. Since the other configurations are the same, the description thereof will be omitted in the present embodiment.
[0073]
　The drive electric motor 21 is a drive device that simultaneously rotates the upper work roll 1 and the lower work roll 2. The drive electric motor 21 is, for example, a motor. In this embodiment, the motor torque of the drive motor 21 is used as the detection end. Specifically, as the motor torque, the current value of the drive motor 21 having a proportional relationship with the motor torque may be output to the inter-roll cross control device 23.
[0074]
　The lower rolling downward load measuring device 73 is provided on the lower side of the rolling mill (that is, between the housing 30 and the lower reinforcing roll chocks 8a and 8b), and measures the rolling downward load applied to the lower reinforcing roll chocks 8a and 8b. .. The downward load measured by the downward downward load measuring device 73 is output to the inter-roll cross control device 23. In FIG. 5, the downward pressure downward load measuring device 73 displays only the working side, but is also provided on the back side (driving side) of the paper surface. Further, in the present embodiment, the downward load is measured by installing the downward downward load measuring device 73 on the lower side of the rolling mill, but the present invention is not limited to this example and is the same as that of the first embodiment. , A reduction direction load measuring device may be provided on the upper side of the rolling mill (that is, between the reduction device 50 and the upper reinforcing roll chocks 7a and 7b) for measurement.
[0075]
　[3-2. Method of setting the rolling mill]
　Next, a method of setting the rolling mill according to the present embodiment will be described with reference to FIGS. 6A to 7C. 6A to 6C are flowcharts showing a setting method of the rolling mill according to the present embodiment. 7A to 7C are explanatory views showing a procedure of roll position adjustment in the setting method of the rolling mill shown in FIGS. 6A to 6C. In addition, in FIGS. 7A to 7C, the description of the load distribution acting between the rolls is omitted. Further, in the following description, the lower reinforcing roll 4 will be described as a reference roll, but the reference roll may be either the uppermost roll or the lowermost roll in the rolling direction, and the upper reinforcing roll 3 is the reference roll. In some cases. In this case as well, the position of the roll may be adjusted by the same procedure as follows.
[0076]
　In the present embodiment, the first adjustment of steps S200 to S214 and the second adjustment of steps S216 to S220 are performed as the first step performed with the roll gap shown in FIG. 1B open. Further, as the second step performed in the kiss roll state shown in FIG. 1B, the third adjustment of steps S222 to S236 is performed.
[0077]
(First Adjustment: S200 to S214)
　First, in the first adjustment, the roll chock position of the lower roll system provided with the lower pressure downward load measuring device 73 is adjusted. As shown in FIGS. 6A and 7A, first, the inter-roll cross control device 23 is in an open state in which the roll gap between the upper work roll 1 and the lower work roll 2 has a predetermined gap with respect to the reduction device 50. As described above, the roll position in the rolling direction is adjusted (S200). Based on the instruction, the reduction device 50 sets the increase bending force in a balanced state and opens the roll gaps of the working rolls 1 and 2.
[0078]
　Further, the inter-roll cross control device 23 loads a predetermined oil lease bending force on the work roll chocks 5a, 5b, 6 from the balanced state by the oil lease bending devices 61a to 61d and 62a to 62d with respect to the roll bending control device 63. Instruct to do (S202). The roll bending control device 63 controls the incremental bending devices 61a to 61d and 62a to 62d based on the instruction, and applies a predetermined incremental bending force to the working roll chocks 5a, 5b, and 6. As a result, the roll gap between the working rolls is opened. Either step S200 or step S202 may be executed first.
[0079]
　Next, with the upper work roll 1 and the lower work roll 2 stopped, the lower pressure downward load measuring device 73 measures the lower pressure downward load on the work side and the lower pressure downward load on the drive side (S204). Then, the inter-roll cross control device 23 calculates the difference between the reduction direction load on the working side and the reduction direction load on the drive side measured in step S204, and sets it as the first control target value (S206, FIG. 7A P21). When the first control target value is set in step S206, the inter-roll cross control device 23 controls the drive of the drive motor 21 by the drive motor control device 22, and rotates the lower work roll 2 in a predetermined manner. Rotate in a predetermined rotation direction at a speed (S208). The rotation of the lower work roll 2 in step S208 is set to normal rotation. Then, as shown in FIG. 6B, when the downward load on the work side and the drive side when the lower work roll is rotated is measured by the downward load measuring device 73 and input to the inter-roll cross control device 23, the inter-roll is The cross control device 23 takes a difference between the reduction direction load on the working side and the reduction direction load on the drive side, and calculates the reduction direction load difference (S210).
[0080]
　When the reduction load difference during the rotation of the lower work roll is calculated in step S210, the inter-roll cross control device 23 sets the reduction load difference as the first control target value set in step S206. As described above, the position of the roll chock of the lower working roll 2 is controlled (S212, P22 of FIG. 7A). In the example shown in FIG. 7A, since the lower reinforcing roll 4 is the reference roll, the positions of the lower reinforcing roll chock 8a and 8b are fixed. Therefore, the inter-roll cross control device 23 controls the positions of the lower work roll chock 6a and 6b, and adjusts the load difference in the reduction direction when the lower work roll is rotated to be the first control target value (S214). The processes of steps S210 to S214 are repeatedly executed until it is determined in step S214 that the reduction load difference has reached the first control target value. The reduction load difference does not have to completely match the first control target value, and if the difference between these values ​​is within an allowable range, the roll-to-roll cross control device 23 has a first reduction load difference. It may be determined that the control target value of is reached.
[0081]
　The first control target value set in step S206 does not have to be the value when the work roll is stopped. For example, as shown in the upper right of FIG. 7A, the lower work roll 2 is in the direction opposite to the rotation direction of step S208. It may be set based on the reduction load on the working side and the driving side measured in the state of rotating to.
[0082]
(Second adjustment: S216 to S220)
　Next, in the second adjustment, the roll chock position of the upper roll system, which is not provided with the reduction load measuring device, is adjusted. As shown in FIGS. 6B and 7B, in the second adjustment, the measurement of the motor torque of the drive motor 21 (S216) and the drive of the roll chock position (S218) are repeatedly performed, and the roll chock position where the motor torque is minimized. (S220).
[0083]
　Since the roll chock position of step S218 may be driven by a roll chock of a roll other than the reference roll, the motor torque of the upper roll system is changed by changing the positions of the upper work roll chock 5a and 5b as shown in the upper side of FIG. (P23), or as shown in the lower side of FIG. 7B, the position of the upper reinforcing roll chock may be changed to measure the motor torque (P24). The inter-roll cross control device 23 ends the second adjustment when the roll chock position when the motor torque becomes the minimum is specified from the measurement result of the motor torque.
[0084]
(Third Adjustment: S222 to S236)
　Next, as shown in FIGS. 6C and 7C, the inter-roll cross control device 23 adjusts the inter-roll cross between the upper roll system and the lower roll system as the third adjustment. First, the inter-roll cross control device 23 causes the reduction device 50 to adjust the roll position in the reduction direction so that the upper work roll 1 and the lower work roll 2 are in a predetermined kiss roll state (S222). The reduction device 50 applies a predetermined load to the rolls based on the instruction, and brings the work rolls 1 and 2 into contact with each other to bring them into a kiss roll state.
[0085]
　Next, in the inter-roll cross control device 23, with the upper work roll 1 and the lower work roll 2 stopped, the lower pressure lower load measuring device 73 applies the lower pressure downward load on the work side and the lower pressure downward load on the drive side. Is measured (S224). Then, the inter-roll cross control device 23 calculates the difference between the reduction direction load on the working side and the reduction direction load on the drive side measured in step S224, and sets it as the second control target value (S226, FIG. 7C P25). When the second control target value is set in step S226, the inter-roll cross control device 23 controls the drive of the drive motor 21 by the drive motor control device 22, and the upper work roll 1 and the lower work roll 1 2 is rotated in a predetermined rotation direction at a predetermined rotation speed (S228). The rotation of the work rolls 1 and 2 in step S228 is set to normal rotation. Then, when the downward load on the work side and the drive side at the time of rotation of the work roll is measured by the downward load measuring device 73 and input to the inter-roll cross control device 23, the inter-roll cross control device 23 moves to the work side. The difference between the reduction direction load and the reduction direction load on the drive side is taken, and the reduction direction load difference is calculated (S230).
[0086]
　When the reduction direction load difference during the rotation of the work roll is calculated in step S230, the inter-roll cross control device 23 makes the reduction direction load difference the second control target value set in step S226. In addition, the positions of the roll chocks of the working roll and the reinforcing roll on the opposite side of the reference roll are controlled (S232, P26 in FIG. 7C). In the example shown in FIG. 7C, since the lower reinforcing roll 4 is the reference roll, the positions of the upper working roll chock 5a and 5b and the upper reinforcing roll chock 7a and 7b are controlled. At this time, since the cross angle of the upper roll system has been adjusted by the second adjustment, the upper work roll 1 and the upper reinforcement are maintained while maintaining the relative positions of the upper work roll chocks 5a and 5b and the upper reinforcement roll chocks 7a and 7b. The positions of the upper working roll chocks 5a and 5b and the upper reinforcing roll chocks 7a and 7b are adjusted so that the rolls 3 move in the same direction at the same time.
[0087]
　The processes of steps S230 to S234 are repeatedly executed until it is determined in step S234 that the reduction load difference has reached the second control target value. The reduction load difference does not have to completely match the second control target value, and if the difference between these values ​​is within the permissible range, the roll-to-roll cross control device 23 has a second reduction load difference. It may be determined that the control target value of is reached. Then, when it is determined that the load difference in the reduction direction has reached the control target value, the roll-to-roll cross control device 23 has a roll gap between the upper work roll 1 and the lower work roll 2 with respect to the reduction device 50. It is adjusted so as to be (S236). After that, rolling of the material to be rolled by the rolling mill is started.
[0088]
　The second control target value set in step S226 does not have to be the value when the work roll is stopped. For example, as shown in the upper right of FIG. 7C, the lower work roll 2 is in the direction opposite to the rotation direction of step S228. It may be set based on the reduction load on the working side and the driving side measured in the state of rotating to.
[0089]
　The method of setting the rolling mill and the rolling mill according to the second embodiment of the present invention has been described above. According to the present embodiment, when the rolling mill is a single drive mill, for the roll system on the side where the reduction direction load measuring device is provided, the cross angle between rolls is adjusted based on the reduction direction load difference, and the reduction direction. For the roll system on the side where the load measuring device is not provided, the cross angle between rolls is adjusted based on the motor torque of the drive motor by utilizing the characteristic that the motor torque changes as the cross angle changes. Then, when the adjustment of the cross angle between the rolls of the upper and lower roll systems is completed, the work roll is put into the kiss roll state, and the cross angle between the upper work roll and the lower work roll is adjusted based on the load difference in the reduction direction. By setting the rolling mill in this way, the thrust force generated between the rolls can be reduced by the cross angle between the rolls, and the meandering and camber of the material to be rolled during rolling can be suppressed.
[0090]
　In the above description, in the second adjustment, the roll chock position is adjusted based on the motor torque of the drive motor, but the present invention is not limited to this example, and the spindle of the drive motor is the same as in the first embodiment. The rolling mill can be set in the same manner by using torque. At this time, the rolling mill is provided with a spindle torque measuring device for measuring the spindle torque of the drive motor, but if two spindle torque measuring devices, one for the upper work roll and the other for the lower work roll, are provided, the upper and lower rolls are provided. For both systems, the roll chock position can be adjusted based on the spindle torque without using the reduction load difference.
[0091]
　Further, in the above description, in the first adjustment, the position of the roll chock is adjusted so that the reduction load difference is within a predetermined allowable range for the roll system on the side where the reduction direction load measuring device is installed. The invention is not limited to this example, and the roll chock position may be adjusted based on the torque as in the second adjustment.
[0092]
　<4. Relationship between roll-to-roll cross angle and various values> In the
　method for setting the rolling mill according to the first and second embodiments described above, the rolling load difference is zero or a value within an allowable range in order to eliminate the roll-to-roll cross. The position of the roll chock is controlled so as to be the same and the torque is minimized. This is based on the finding that there is a correlation as shown below between the reduction load difference, the motor torque, the spindle torque and the cross angle between rolls. Hereinafter, the relationship between the cross angle between rolls and various values ​​will be described with reference to FIGS. 8 to 16.
[0093]
　[4-1. Behavior of load difference in the rolling direction during forward and reverse rotation of the roll and calculation method of control target value] In
　the first and second embodiments described above, when adjusting based on the load difference in the rolling direction, the roll is reversed between normal rotation and reverse rotation. The relationship between the reduction load on the working side and the reduction load on the drive side, which is the difference between time and time, was investigated. In this study, for example, as shown in FIG. 8, in a rolling mill having a pair of working rolls 1 and 2 and a pair of reinforcing rolls 3 and 4 supporting them, the upper working roll 1 and the lower working roll 2 are used. The roll gap between the working rolls 1 and 2 was opened.
[0094]
　The upper work roll 1 is supported by the upper work roll chock 5a on the work side and the upper work roll chock 5b on the drive side. Further, the lower work roll 2 is supported by a lower work roll chock 6a on the work side and a lower work roll chock 6b on the drive side. Further, the upper reinforcing roll 3 is supported by the upper reinforcing roll chock 7a on the working side and the upper reinforcing roll chock 7b on the driving side. Further, the lower reinforcing roll 4 is supported by a lower reinforcing roll chock 8a on the working side and a lower reinforcing roll chock 8b on the driving side. An increase bending force is applied to the upper work roll chocks 5a and 5b and the lower work roll chocks 6a and 6b by an increase bending device (not shown) with the work rolls 1 and 2 separated from each other.
[0095]
　As shown in FIG. 8, when each roll is rotated while a cross angle between the rolls is generated between the lower work roll 2 and the lower reinforcement roll 4, the space between the lower work roll 2 and the lower reinforcement roll 4 is formed. A thrust force is generated in the lower reinforcing roll 4, and a moment is generated in the lower reinforcing roll 4. In such a state, in this verification, the downward load was detected in the case where the roll was rotated forward and the case where the roll was reversed. For example, as shown in FIG. 9, the lower working roll is rotated around an axis (Z axis) parallel to the rolling direction by a predetermined cross angle change section at the time of roll forward rotation and roll reverse rotation, respectively, and the cross angle between rolls is adjusted. The reduction load when changed was detected. FIG. 9 shows a small rolling mill having a working roll diameter of 80 mm, when the cross angle between the rolls of the lower working roll is changed by 0.1 ° so as to face the exit side on the drive side, and when the roll is forward and reverse. This is a measurement result in which a change in the load difference in the rolling direction is detected. The increasing bending force applied to each work roll chock was 0.5 tonf / chuck.
[0096]
　Looking at the detection results, the load difference in the rolling direction acquired during the forward rotation of the rolls becomes larger in the negative direction than before the cross angle between the rolls was changed. On the other hand, the load difference in the reduction direction acquired at the time of roll reversal becomes larger in the positive direction than before the cross angle between the rolls is changed. As described above, the magnitude of the load difference in the rolling direction is substantially the same between the forward rotation of the roll and the reverse rotation of the roll, but the directions are opposite.
[0097]
　Therefore, based on the above relationship, with reference to the roll forward rotation state, the deviation from the reference in the roll reverse state is halved, and the thrust force between the upper and lower work rolls and the reinforcing roll becomes zero. Set as the control target value. The control target value can be expressed by the following equation (1).
[0098]
[Number 1]

[0099]
　Here, P ' DFT T is the control target value of the upper roll system, P ' DFT B is a control target value of the lower roll system. Also, P df T and P ' df T is the difference of the work side and drive side of the rolling direction measured load of the upper roll system in and reverse state during roll forward, P df B and P ' df B is It is the difference in the downward load on the working side and the driving side of the reduced load measured value of the lower roll system in the roll forward rotation and roll reverse states. In this way, the control target values ​​of the upper roll system and the lower roll system can be calculated.
[0100]
　Therefore, based on the above relationship, for example, the control target value is calculated with the roll normal rotation state as a reference (that is, the reference value of the reduction direction load difference), and the reduction direction load difference in the roll reversal state matches the control target value. By doing so, the thrust force between rolls can be made zero.
[0101]
　[4-2. Behavior of reduction load difference during roll stop and rotation and calculation method of control target value] In
　addition, FIG. 10 shows the reduction direction load on the work side and the reduction direction load on the drive side between roll stop and roll rotation. The change in the load difference in the reduction direction, which is the difference between the two, is shown. Here, a predetermined cross angle between the rolls is provided between the lower work roll 2 and the lower reinforcing roll 4, a reduction load is detected when the roll is stopped, and then the roll is rotated to apply the reduction load. It shows the load difference in the reduction direction when it is detected. In addition, FIG. 10 shows a small rolling mill having a working roll diameter of 80 mm, when the cross angle between the rolls of the lower working roll is changed by 0.1 ° so as to face the exit side of the drive side, and when the roll is forward and reverse. It is one measurement result which detected the change of the load difference in the rolling direction with and. The incremental bending force applied to each work roll chock was 0.5 tonf / chuck.
[0102]
　As shown in FIG. 10, the reduction load difference when the roll is rotated becomes larger in the negative direction than the reduction load difference when the roll is stopped. In this way, the load difference in the reduction direction differs between when the roll is stopped and when the roll is rotated. This is because it is considered that the reduction load difference appearing in the roll stopped state is caused by a cause other than the thrust force.
[0103]
　From the above, it is considered that the reduction load difference appearing in the roll stopped state is caused by a cause other than the thrust force. From this, the thrust force between the upper and lower working rolls and the reinforcing rolls can be made zero by setting the control target value based on the load difference in the rolling direction in the roll stopped state and controlling the roll chock position. That is, the control target value is expressed by the following equation (2).
[0104]
[Number 2]

[0105]
Here, P r DFT T is the control target value of the upper roll system, P r DFT B is a control target value of the lower roll system. P 0 df T is the reduction load difference between the working side and the drive side of the reduction load measurement value of the upper roll system in the roll rotation stop state, and P 0 df B is the reduction direction load difference of the lower roll system in the roll rotation stop state. It is the difference in the reduced load between the working side and the driving side of the reduced load measurement value. The roll rotation state referred to here does not particularly specify the direction of rotation, and the rotation of the roll may be either forward rotation or reverse rotation. In this way, the control target values ​​of the upper roll system and the lower roll system can be calculated.
[0106]
　Therefore, based on the above relationship, the roll chock position during roll rotation (for example, during roll reversal) is controlled with the reduction direction load difference when the roll is stopped as the control target value, and the reduction direction load difference in the roll reversal state is controlled. By making it match the target value, the thrust force between rolls can be set to zero.
[0107]
　The above-mentioned experimental results and the calculation method of the control target value show the influence of the thrust force acting between the working roll and the reinforcing roll on the load difference in the downward direction when the roll gap is opened. is there. Even in the kiss roll state, if the cross angle between the rolls between the work roll and the reinforcing roll is adjusted, the effect of the thrust force acting between the upper and lower work rolls on the reduction load difference is in the open state. The same applies to the calculation method of the control target value.
[0108]
　[4-3. Relationship in the open state of the roll gap]
　First, based on FIGS. 11 to 14B, the relationship between the cross between rolls and various values ​​when the roll gap of the working roll is in the open state will be described. FIG. 11 is an explanatory view showing the arrangement of the working rolls 1 and 2 and the reinforcing rolls 3 and 4 in the rolling mill in which the roll gap is open. FIG. 12 is an explanatory diagram showing the definition of the cross angle between rolls. FIG. 13 shows the results of an experiment conducted on a small rolling mill having a working roll diameter of 80 mm, and is a graph showing a relationship between the working roll cross angle and the reduction load difference, the motor torque, and the spindle torque when the roll gap is open. Is. FIG. 14A is an explanatory diagram showing a mechanism in which the relationship between the inter-roll cross angle shown in FIG. 13 and various values ​​occurs, and shows a case where there is no inter-roll cross angle. FIG. 14B is an explanatory diagram showing a mechanism in which the relationship between the inter-roll cross angle shown in FIG. 13 and various values ​​occurs, and shows a case where there is an inter-roll cross angle. In FIG. 13, the reduction load difference is measured when the working roll cross angle is set in the increasing direction and when the working roll cross angle is set in the decreasing direction, respectively, and is the measured value in the increasing direction and the measured value in the decreasing direction. The averaged value of is displayed.
[0109]
　As shown in FIG. 11, the roll gap between the upper work roll 1 and the lower work roll 2 is opened, and an increase bending force is applied to the work roll chock by the increase bending device. Then, changes in the reinforcing roll thrust reaction force, the working roll thrust reaction force, and the load difference in the reduction direction when the cross angles of the upper reinforcing roll 3 and the lower reinforcing roll 4 were changed were investigated. As shown in FIG. 12, the cross angle of the reinforcing roll is represented as positive in the direction in which the working side of the roll axis Aroll extending in the roll body length direction faces from the width direction (X direction) to the exit side. Further, the increase bending force was loaded with 0.5 tonf per roll chock.
[0110]
　As a result, as shown in FIG. 13, when the cross angle between the upper work roll 1 and the lower work roll 2 is gradually increased from a negative angle to an angle of zero and a positive angle, the load difference in the reduction direction is increased. It was found that there is a relationship that the value increases as well as the cross angle. Regarding the motor torque and spindle torque, when the cross angle between the upper work roll 1 and the lower work roll 2 is gradually increased from a negative angle to a zero angle and a positive angle, the cross angle of the work roll is increased. It was confirmed that when is zero, it takes a minimum value.
[0111]
　As shown in FIG. 14A, when there is no cross angle between the rolls between the work roll WR and the reinforcing roll BUR, the force F1 acting on the work roll WR from the reinforcing roll BUR and the reinforcing roll BUR are rotated. The vector direction coincides with the force F2 required to make it. On the other hand, as shown in FIG. 14B, when there is a cross angle between the rolls between the work roll WR and the reinforcing roll BUR, the force F1 acting on the work roll WR from the reinforcing roll BUR and the reinforcing roll BUR are rotated. The vector direction is different from the force F2 required for. Therefore, in order to rotate the reinforcing roll BUR, a larger driving force is required than when there is no cross angle between the rolls. Since the torque changes according to the cross angle between rolls in this way, it is considered that the correlation shown in FIG. 13 occurs between the motor torque and the spindle torque and the cross angle between rolls.
[0112]
　[4-4. Relationship in the kiss roll state (with pair cloth)]
　Next, the relationship between the cross between rolls and various values ​​when the work roll is in the kiss roll state will be described with reference to FIGS. 15 and 16. FIG. 15 is an explanatory view showing the arrangement of the working rolls 1 and 2 and the reinforcing rolls 3 and 4 in the rolling mill in the kiss roll state. FIG. 16 is a graph showing one relationship between the pair cross angle between the work roll and the reinforcing roll and the load difference in the reduction direction in the kiss roll state. In FIG. 15, the reduction load difference is measured when the pair cross angle is set in the increasing direction and when it is set in the decreasing direction, and the measured value in the increasing direction and the measured value in the decreasing direction are averaged. The converted value is displayed.
[0113]
　Here, as shown in FIG. 15, when the upper work roll 1 and the lower work roll 2 are in the kiss roll state and the pair cross angle between the work roll and the reinforcing roll is changed, the change in the load difference in the reduction direction is investigated. .. At this time, the kiss roll tightening load was set to 6.0 tonf (3.0 tonf on one side).
[0114]
　As a result, as shown in FIG. 16, when the pair cross angle is gradually increased from a negative angle to an angle of zero and a positive angle, it changes in response to a change in the pair cross angle, and the load difference in the reduction direction is also large. It was found that when the pair cross angle is zero, the load difference in the reduction direction is also zero. From this, it is possible to detect the influence of the thrust force caused by the cross between the upper and lower working rolls from the reduction load difference in the state where the kiss roll tightening load is applied. Then, it was confirmed that the thrust force between the upper and lower work rolls may be reduced by controlling the roll chock position by integrating the upper and lower work rolls and the reinforcing rolls so that these values ​​become zero.
Example
[0115]
(Example 1) In
　a so-called twin-drive hot plate rolling mill in which the upper work roll 1 and the lower work roll 2 shown in FIG. 2 are independently rotatable, the thrust force due to the cross between rolls is applied. The conventional method and the method of the present invention were compared with respect to the rolling down leveling setting in consideration of the influence.
[0116]
　First, in the conventional method, the housing liner and the chock liner were periodically replaced without using the function of the inter-roll cross control device of the present invention, and the equipment was managed so that the inter-roll cross did not occur.
[0117]
　On the other hand, in the method of the present invention, the position of the roll chock was adjusted according to the processing flow shown in FIGS. 3A and 3B before rolling by using the function of the inter-roll cross control device according to the first embodiment. That is, first, with the roll gap open and the increased bending force applied, the upper and lower spindle torques were measured by the spindle torque measuring device, and the positions of the upper and lower working roll chocks were controlled. Next, in the kiss roll state, the reduction load on the work side and the drive side is measured, the reduction load difference is calculated, and the upper and lower work rolls and the reinforcing rolls are set so that the reduction load difference becomes a preset control target value. The position of the roll chock was controlled.
[0118]
　Table 1 shows the measured values ​​of camber generation with respect to the number of representative rolled rolls for the present invention and the conventional method. Of the actual camber values ​​per 1 m of the tip of the material to be rolled, the values ​​immediately before the reinforcement roll rearrangement and immediately before the housing liner replacement are suppressed to a relatively small value of 0.13 mm / m in the case of the present invention. You can see that. On the other hand, in the case of the conventional method, the actual camber value is larger than that in the case of the present invention at the time immediately before the reinforcement roll is rearranged or immediately before the housing liner is replaced.
[0119]
[table 1]

[0120]
　As described above, in the method of the present invention, the positions of the upper and lower working roll chocks are controlled based on the upper and lower spindle torques measured with the roll gap open before rolling, and then the rolling direction when the roll gap is set to the kiss roll state. By controlling the chock position of each roll of the roll system on the opposite side of the reference roll so that the load difference becomes a preset control target value, the inter-roll cross itself is eliminated and the thrust force caused by the inter-roll cross is generated. Left-right asymmetric deformation of the material to be rolled can be eliminated. Therefore, it is possible to stably produce a metal plate material without meandering and camber, or with extremely slight meandering and camber.
[0121]
(Example 2)
　Next, hot finishing in which each stand is configured such that the upper work roll and the lower work roll as shown in FIG. 5 are driven by one drive electric motor via a pinion stand or the like. For the 5th to 7th stands of the rolling mill, the conventional method and the method of the present invention were compared with respect to the reduction leveling setting in consideration of the influence of the thrust force between rolls due to the cross between rolls.
[0122]
　First, in the conventional method, the housing liner and the chock liner were periodically replaced without using the function of the inter-roll cross control device of the present invention, and the equipment was managed so that the inter-roll cross did not occur. As a result, when a thin wide material having a protruding side plate thickness of 1.2 mm and a width of 1200 mm was rolled immediately before the replacement of the housing liner, meandering of 100 mm or more occurred at the sixth stand, which caused narrowing down.
[0123]
　On the other hand, in the method of the present invention, using the function of the inter-roll cross control device according to the second embodiment, first, the upper work roll and the upper work roll are opened with the roll gap open according to the processing flow shown in FIGS. 6A to 6C. With the lower work roll stopped, the reduction load on the work side and the reduction load on the drive side are measured to calculate the reduction load difference, and the reduction load difference is the first control target value. The roll chock position of the lower work roll was adjusted so as to be. Next, the roll chock position of the upper roll system, which is not provided with the reduction load measuring device, was adjusted so that the motor torque was minimized. After that, the kiss roll state is set, the reduction load on the work side and the drive side is measured, the reduction load difference is calculated, and the upper work roll and the upper reinforcement roll are set so that the reduction load difference becomes the second control target value. The position of the roll chock was controlled.
[0124]
　As a result, even in the period immediately before the replacement of the housing liner, even when a thin wide material having a protruding side plate thickness of 1.2 mm and a width of 1200 mm, which had been narrowed down by the conventional method, was rolled, meandering of 15 mm or less remained and the material to be rolled was rolled. It was possible to pass the rolling line through the material without causing drawing.
[0125]
　As described above, in the method of the present invention, before rolling, the roll gap is opened, the roll chock position of the work roll on the side where the reduction direction load measuring device is provided is adjusted based on the reduction direction load difference, and reduction is performed. After adjusting the roll chock position of the roll system on the side where the directional load measuring device is not provided so that the motor torque is minimized, the roll system is put into a kiss roll state, and the roll system on the side where the indentation direction load measuring device is not provided By controlling the position of the roll chock based on the load difference in the rolling direction, the cross between rolls itself can be eliminated, and the left-right asymmetric deformation of the material to be rolled caused by the thrust force caused by the cross between rolls can be eliminated. Therefore, it is possible to stably produce a metal plate material without meandering and camber, or with extremely slight meandering and camber.
[0126]
　Although preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, the present invention is not limited to such examples. It is clear that a person having ordinary knowledge in the field of technology to which the present invention belongs can come up with various modifications or modifications within the scope of the technical ideas described in the claims. , These are also naturally understood to belong to the technical scope of the present invention.
[0127]
　<5. Deformation Example> In the
　above embodiment, a four-stage rolling mill provided with a pair of working rolls and a pair of reinforcing rolls has been described, but the present invention is applicable to a rolling mill having four or more stages. In this case as well, any one of the rolls constituting the rolling mill may be set as the reference roll. For example, in the case of a 6-stage rolling mill, any of a working roll, an intermediate roll and a reinforcing roll can be set as a reference roll. At this time, as in the case of the four-stage rolling mill, it is preferable to use the roll located at the lowermost portion or the uppermost portion as the reference roll among the rolls arranged in the rolling direction.
[0128]
(1) In the case of vertically independent drive In the
　6-stage rolling mill, intermediate rolls 41 and 42 are provided between the working rolls 1 and 2 and the reinforcing rolls 3 and 4, respectively, as shown in FIG. 17A, for example. The upper intermediate roll 41 is supported by the upper intermediate roll chock 43a on the working side and the upper intermediate roll chock 43b on the driving side (the upper intermediate roll chock 43a and 43b are collectively referred to as the "upper intermediate roll chock 43"). The lower intermediate roll 42 is supported by the lower intermediate roll chock 44a on the working side and the lower intermediate roll chock 44b on the driving side (the lower intermediate roll chock 44a and 44b are collectively referred to as the "lower intermediate roll chock 44").
[0129]
　The upper work roll 1 is rotationally driven by the upper drive motor 21a, and the lower work roll 2 is rotationally driven by the lower drive motor 21b. That is, in the example shown in FIG. 17A, the upper work roll 1 and the lower work roll 2 are configured to be independently rotatable. The upper drive electric motor 21a and the lower drive electric motor 21b are, for example, motors, and the spindles thereof are provided with spindle torque measuring devices 31a and 31b for measuring the spindle torque, respectively.
[0130]
　On the upper work roll chock 5a and 5b, an upper work roll chock pressing device (upper work roll chock pressing device 9 in FIG. 2) is provided on the working side and the driving side on the rolling direction entry side, respectively, like the four-stage rolling mill shown in FIG. An upper work roll chock drive device (upper work roll chock drive device 11 in FIG. 2) is provided on the work side and the drive side on the rolling direction exit side, respectively. Similarly, the lower work roll chock 6a and 6b are provided with lower work roll chock pressing devices (lower work roll chock pressing device 10 in FIG. 2) on the working side and the driving side on the rolling direction entry side, respectively. (Lower work roll chock drive device 12 in FIG. 2) is provided on the work side and the drive side on the rolling direction exit side, respectively. The upper and lower work roll chock drive devices are provided with position detection devices that detect the positions of the work roll chock 5a, 5b, 6a, and 6b, respectively.
[0131]
　Further, the upper intermediate roll chock 43a and 43b are provided with upper intermediate roll chock pressing devices (not shown) on the working side and the driving side on the rolling direction exit side, respectively, and the upper intermediate roll chock driving device (not shown) is provided. It is provided on the work side and the drive side on the entry side in the rolling direction, respectively. Similarly, the lower intermediate roll chock 44a and 44b are provided with lower intermediate roll chock pressing devices (not shown) on the working side and the driving side on the rolling direction exit side, respectively, and lower intermediate roll chock driving devices (not shown). ) Are provided on the work side and the drive side on the entry side in the rolling direction, respectively. The upper and lower intermediate roll chock drive devices are provided with position detection devices that detect the positions of the intermediate roll chock 43a, 43b, 44a, and 44b, respectively.
[0132]
　Further, on the reinforcing roll chock 7a and 7b, an upper reinforcing roll chock pressing device (upper reinforcing roll chock pressing device 13 in FIG. 2) is provided on the working side and the driving side on the rolling direction exit side as in the 4-stage rolling mill shown in FIG. An upper reinforcing roll chock driving device (upper reinforcing roll chock driving device 14 in FIG. 2) is provided on each of the working side and the driving side on the rolling direction entry side, respectively. The upper reinforcing roll chock drive device includes a position detecting device for detecting the positions of the upper reinforcing roll chock 7a and 7b.
[0133]
　On the other hand, since the lower reinforcing roll chock 8a and 8b use the lower reinforcing roll 4 as the reference roll in the present embodiment, they are the reference reinforcing roll chock. Therefore, since the lower reinforcing roll chock 8 is not driven to adjust the position, it is not always necessary to provide the roll chock driving device and the position detecting device like the upper reinforcing roll chock 7a and 7b. However, as shown in FIG. 2, for example, a lower reinforcing roll chock pressing device 40 or the like is provided on the entry side or the exit side in the rolling direction so that the position of the reference reinforcing roll chock used as the reference for position adjustment does not change. The rattling of the roll chocks 8a and 8b may be suppressed.
[0134]
　Also in such a 6-stage rolling mill, the setting of the rolling mill to be performed before the rolling reduction position zero adjustment or before the start of rolling may be performed in the same manner as in the case of the 4-stage rolling mill shown in FIGS. 4A and 4B. That is, the first step is first carried out with the roll gaps of the work rolls 1 and 2 opened. The first step corresponds to the first step shown in FIG. 1B. In the first step, the positions of the intermediate roll chocks 43a, 43b, 44a, 44b of the intermediate rolls 41 and 42 and the reinforcing roll chocks 7a, 7b, 8a, 8b of the reinforcing rolls 3 and 4 are determined for the upper roll system and the lower roll system, respectively. After the first adjustment to be adjusted and the first adjustment are completed, for the upper roll system and the lower roll system, the intermediate roll chocks 43a, 43b, 44a, 44b of the intermediate rolls 41 and 42 and the work roll chock 5a of the work rolls 1 and 2 are used. It consists of a second adjustment for adjusting the positions of the 5b, 6a, and 6b.
[0135]
　For example, in the first adjustment, as shown on the upper side of FIG. 17A, the work roll chocks 5a, 5b, 6a, 6b of the work rolls 1 and 2 are set so that the torque values ​​of the upper roll system and the lower roll system are minimized. And the intermediate roll chocks 43a, 43b, 44a, 44b of the intermediate rolls 41 and 42 are adjusted simultaneously and in the same direction while maintaining the relative positions between the roll chocks (P31, P32). By adjusting the positions of the working roll chock 5a, 5b, 6a, 6b and the intermediate roll chock 43a, 43b, 44a, 44b in this way, the positions of the intermediate rolls 41, 42 with respect to the reinforcing rolls 3 and 4 are adjusted.
[0136]
　Alternatively, as shown in the lower side of FIG. 17A, in the first adjustment, the reinforcing roll chocks 7a and 7b can be adjusted when the roll system is on the side opposite to the reference roll side. Therefore, similarly to the above, the positions of the roll chock 7a and 7b of the reinforcing roll 3 may be adjusted so that the torque value becomes the minimum (P33).
[0137]
　Further, FIG. 17A shows a case where the reduction direction load measuring devices 71a and 71b are installed in the roll system on the side opposite to the reference roll side. At this time, regarding the roll system on the side where the reduction direction load measuring device is installed (that is, the upper roll system in FIG. 17A), the pair of working rolls 1 and 2 are different 2 depending on the reduction direction load measuring devices 71a and 71b. The reduction direction load in each rotating state is measured on the work side and the drive side, respectively, and the intermediate roll chock between the work roll chock 5a and 5b of the work roll 1 and the intermediate roll 41 is adjusted so that the reduction direction load difference is within a predetermined allowable range. The positions of 43a and 43b may be controlled simultaneously and in the same direction while maintaining the relative positions between the roll chocks. Similarly, when the reduction load measuring device is installed in the roll system on the reference roll side, the positions of the work roll chock of the work roll and the intermediate roll chock of the intermediate roll are simultaneously and the same while maintaining the relative positions between the roll chocks. It can be controlled in the direction.
[0138]
　In the case of FIG. 17A, since the reduction direction load measuring device is installed in the roll system on the opposite side to the reference roll side, the positions of the reinforcing roll chocks 8a and 8b of the lower reinforcing roll 4 are adjusted as described above. May be good. At this time, with respect to the roll system on the side where the reduction load measuring device is not installed, that is, the lower roll system of FIG. 17A, as in the upper side of FIG. 17A, the lower work roll 2 is set so that the torque value is minimized. The positions of the lower working roll chocks 6a and 6b and the lower intermediate roll chocks 44a and 44b of the lower intermediate roll 42 may be controlled simultaneously and in the same direction while maintaining the relative positions between the roll chocks (P34).
[0139]
　In the first adjustment, the bending device of the intermediate rolls 41 and 42 is used, and the bending force is applied between the intermediate rolls 41 and 42 and the reinforcing rolls 3 and 4. At this time, the bending device of the work rolls 1 and 2 applies a bending force to the extent that the intermediate rolls 41 and 42 and the work rolls 1 and 2 do not slip.
[0140]
　Next, in the second adjustment, for example, as shown on the upper side of FIG. 17B, the work roll chocks 5a, 5b, and 6a of the work rolls 1 and 2 are set so that the torque values ​​of both the upper roll system and the lower roll system are minimized. , 6b may be adjusted (P35, P36).
[0141]
　Alternatively, as shown on the lower side of FIG. 17B, for the roll system on the opposite side of the reference roll, that is, the upper roll system, the upper reinforcing roll chocks 7a and 7b of the reinforcing roll 3 and the upper middle are so as to minimize the torque value. The positions of the upper and middle roll chocks 43a and 43b of the roll 41 are adjusted by moving them in the same direction at the same time while maintaining the relative positions between the roll chocks (P37). In this way, the positions of the upper work roll chock 5a and 5b may be adjusted to adjust the positions of the upper work roll 1 and the upper intermediate roll 41. At this time, with respect to the roll system on the reference roll side, that is, the lower roll system, the positions of the lower work roll chock 6a and 6b of the lower work roll 2 are adjusted so that the torque value becomes the minimum as in the upper side of FIG. 17B. (P38).
[0142]
　Further, in the second adjustment, for the roll system on the side where the reduction direction load measuring device is installed, even if the position of the roll chock of the work roll is adjusted so that the reduction direction load difference is within a predetermined allowable range. Good. For example, in FIG. 17B, the downward load measuring devices 71a and 71b are provided in the upper roll system. Therefore, for the upper roll system, the positions of the upper work roll chocks 5a and 5b are adjusted so that the reduction load difference obtained from the measured values ​​of the reduction load measuring devices 71a and 71b is within a predetermined allowable range. The positions of the upper working roll 1 and the upper intermediate roll 41 may be adjusted. Alternatively, when the roll system on the side where the reduction load measuring device is not installed is the roll system on the opposite side to the reference roll, the reinforcing roll chock can be adjusted. In this case, the positions of the upper reinforcing roll chocks 7a and 7b of the reinforcing roll 3 and the upper intermediate roll chocks 43a and 43b of the upper intermediate roll 41 are adjusted by moving them in the same direction at the same time while maintaining the relative positions between the roll chocks. .. In this way, the positions of the upper work roll chock 5a and 5b may be adjusted to adjust the positions of the upper work roll 1 and the upper intermediate roll 41.
[0143]
　On the other hand, for the roll system on the side where the reduction load measuring device is not installed, that is, the lower roll system of FIG. 17B, the lower work roll chock of the lower work roll 2 is made so that the torque value is minimized as described above. The positions of 6a and 6b may be adjusted. Further, when the roll system on the side where the reduction load measuring device is not installed is the roll system on the opposite side to the reference roll, the reinforcing roll chock can be adjusted. In this case, the positions of the upper reinforcing roll chocks 7a and 7b of the reinforcing roll 3 and the upper intermediate roll chocks 43a and 43b of the upper intermediate roll 41 are controlled simultaneously and in the same direction while maintaining the relative positions between the roll chocks. The positions of the upper work roll chock 5a and 5b may be adjusted to adjust the positions of the upper work roll 1 and the upper intermediate roll 41.
[0144]
　In the second adjustment, the bending device of the work rolls 1 and 2 is used, and a load is applied between the work rolls 1 and 2 and the intermediate rolls 41 and 42. At this time, the bending devices of the intermediate rolls 41 and 42 are set to zero or balanced. When the intermediate rolls 41 and 42 have a decay bending device, the decay bending device acts in the direction (minus direction) of unloading the load between the intermediate rolls 41 and 42 and the reinforcing rolls 3 and 4. You may let me.
[0145]
　Next, when the first step is completed, the work rolls 1 and 2 are put into a kiss roll state as shown in FIG. 17C, and the second step is carried out. At this time, the reduction direction load measuring devices 71a and 71b measure the reduction direction load of the pair of work rolls 1 and 2 in two different rotational states on the work side and the drive side, respectively. Then, the rolling direction position of the roll chock of the reference roll (that is, the lower reinforcing roll chock 8a, 8b) is fixed as the reference position, and the roll chock driving device is driven so that the load difference in the rolling direction is within a predetermined allowable range. Adjust the position of the roll chock of each roll of the roll system (that is, the upper roll system) opposite to the reference roll. At this time, these roll chocks are controlled simultaneously and in the same direction while maintaining the relative positions of the roll chocks of the rolls constituting the upper roll system (P39 in FIG. 17C).
[0146]
　The second step corresponds to the second step shown in FIG. 1B, and may be carried out in the same manner as the second adjustment of the four-stage rolling mill shown in FIG. 4B. That is, for example, as shown in FIG. 17C, a normal rotation state and a reverse rotation state may be set as two different rotation states of the pair of work rolls 1 and 2, and a stop state and a rotation state (forward rotation or rotation). And may be set.
[0147]
(2) In the case of simultaneous vertical drive In
　addition, as shown in FIG. 18A, for example, as shown in FIG. In some cases, it is driven by one drive electric motor 21. The configuration of the rolling mill shown in FIG. 18A does not include a spindle torque measuring device as compared with the 6-stage rolling mill shown in FIG. The difference is that the downward rolling downward load measuring devices 73a and 73b are installed on the lower side of the rolling mill instead. Other configurations are the same. The driving motor 21 of the rolling mill shown in FIG. 18A rotates the upper work roll 1 and the lower work roll 2 at the same time.
[0148]
　Also in such a 6-stage rolling mill, the setting of the rolling mill to be performed before the rolling reduction position zero adjustment or before the start of rolling may be performed in the same manner as in the case of the 4-stage rolling mill shown in FIGS. 7A to 7C. That is, the first step is first carried out with the roll gaps of the work rolls 1 and 2 opened. The first step corresponds to the first step shown in FIG. 1B. In the first step, the positions of the intermediate roll chocks 43a, 43b, 44a, 44b of the intermediate rolls 41 and 42 and the reinforcing roll chocks 7a, 7b, 8a, 8b of the reinforcing rolls 3 and 4 are determined for the upper roll system and the lower roll system, respectively. After the first adjustment to be adjusted and the first adjustment are completed, for the upper roll system and the lower roll system, the intermediate roll chocks 43a, 43b, 44a, 44b of the intermediate rolls 41 and 42 and the work roll chock 5a of the work rolls 1 and 2 are used. It consists of a second adjustment for adjusting the positions of the 5b, 6a, and 6b.
[0149]
　In the upper roll system and the lower roll system, the order in which the first adjustment and the second adjustment are performed is not particularly limited. For example, the first adjustment and the second adjustment may be sequentially performed for the upper roll system and the lower roll system, respectively, and after the first adjustment of the upper roll system and the lower roll system is performed, the upper roll system and the lower roll system may be performed. A second adjustment may be carried out.
[0150]
　For example, in the first adjustment, as shown on the upper side of FIG. 18A, first, the upper roll system, which is the roll system on the side where the reduction direction load measuring device is not installed, is subjected to the upper work so that the torque value is minimized. The positions of the upper working roll chocks 5a and 5b of the roll 1 and the upper intermediate roll chocks 43a and 43b of the upper intermediate roll 41 are controlled simultaneously and in the same direction while maintaining the relative positions between the roll chocks (P41). By adjusting the positions of the upper working roll chock 5a and 5b and the upper intermediate roll chock 43a and 43b in this way, the position of the upper intermediate roll 41 with respect to the upper reinforcing roll 3 is adjusted.
[0151]
　Alternatively, as for the upper roll system, as shown in the lower side of FIG. 18A, if the roll system is not on the reference roll side, the reinforcing roll chock can be adjusted, so that the upper reinforcing roll 3 is adjusted so that the torque value is minimized. The positions of the reinforcing roll chocks 7a and 7b of the above may be adjusted (P42).
[0152]
　On the other hand, with respect to the lower roll system, which is the roll system on the side where the lower pressure downward load measuring device is installed, as shown in FIG. The reduction load in two different rotational states is measured on the working side and the driving side, respectively. Then, the positions of the lower working roll chocks 6a and 6b of the lower working roll 2 and the lower intermediate roll chock 44a and 44b of the lower intermediate roll 42 are adjusted so that the load difference in the rolling direction is within a predetermined allowable range. At this time, these roll chocks are controlled simultaneously and in the same direction while maintaining the relative positions between the lower working roll chocks 6a and 6b and the lower intermediate roll chocks 44a and 44b (P43). As two different rotation states of the pair of work rolls 1 and 2, a normal rotation state and a reverse rotation state may be set, or a stop state and a rotation state (forward rotation or rotation) may be set. If the lower roll system is the roll system on the opposite side of the reference roll, the reinforcing roll chock can be adjusted. In this case, the positions of the lower reinforcing roll chock 8a and 8b of the lower reinforcing roll 4 may be adjusted so that the load difference in the rolling direction is within a predetermined allowable range.
[0153]
　In the first adjustment, the bending device of the intermediate rolls 41 and 42 is used, and the bending force is applied between the intermediate rolls 41 and 42 and the reinforcing rolls 3 and 4. At this time, the bending device of the work rolls 1 and 2 applies a bending force to the extent that the intermediate rolls 41 and 42 and the work rolls 1 and 2 do not slip.
[0154]
　Next, in the second adjustment, first, for the upper roll system, which is the roll system on the side where the reduction direction load measuring device is not installed, the torque value is minimized, for example, as shown in the upper side of FIG. 18C. In addition, the positions of the upper work roll chock 5a and 5b of the upper work roll 1 may be adjusted (P44). Alternatively, as shown on the lower side of FIG. 18C, the positions of the upper intermediate roll chocks 43a and 43b of the upper intermediate roll 41 and the upper reinforcing roll chocks 7a and 7b of the upper reinforcing roll 3 are adjusted so that the torque value becomes the minimum. It is also good. In this case, these roll chocks are controlled simultaneously and in the same direction while maintaining the relative positions between the upper intermediate roll chocks 43a and 43b and the upper reinforcing roll chocks 7a and 7b (P45).
[0155]
　On the other hand, with respect to the lower roll system, which is the roll system on the side where the downward load measuring device is installed, as shown in FIG. 18D, the downward downward load measuring devices 73a and 73b are used to make the pair of working rolls 1, 2 The reduction load in two different rotational states is measured on the working side and the driving side, respectively. Then, the positions of the lower work roll chocks 6a and 6b of the lower work roll 2 are adjusted so that the load difference in the reduction direction is within a predetermined allowable range (P46). As two different rotation states of the pair of work rolls 1 and 2, a normal rotation state and a reverse rotation state may be set, or a stop state and a rotation state (forward rotation or rotation) may be set. If the lower roll system is a roll system on the opposite side of the reference roll, the lower reinforcing roll chock 8a, 8b and the lower intermediate roll of the lower reinforcing roll 4 are set so that the load difference in the rolling direction is within a predetermined allowable range. The positions of the lower intermediate roll chocks 44a and 44b of 42 may be adjusted by controlling them simultaneously and in the same direction while maintaining the relative positions between the roll chocks.
[0156]
　In the second adjustment, the bending device of the work rolls 1 and 2 is used, and a load is applied between the work rolls 1 and 2 and the intermediate rolls 41 and 42. At this time, the bending devices of the intermediate rolls 41 and 42 are set to zero or balanced. When the intermediate rolls 41 and 42 have a decay bending device, the decay bending device acts in the direction (minus direction) of unloading the load between the intermediate rolls 41 and 42 and the reinforcing rolls 3 and 4. You may let me.
[0157]
　Next, when the first step is completed, the work rolls 1 and 2 are put into a kiss roll state as shown in FIG. 18E, and the second step is carried out. At this time, the downward load measuring devices 73a and 73b measure the downward load of the pair of working rolls 1 and 2 in two different rotational states on the working side and the driving side, respectively. Then, the rolling direction position of the roll chock of the reference roll (that is, the lower reinforcing roll chock 8a, 8b) is fixed as the reference position, and the roll chock driving device is driven so that the load difference in the rolling direction is within a predetermined allowable range. The position of the roll chock of each roll of the roll system (that is, the upper roll system) opposite to the reference roll is adjusted (P47). At this time, these roll chocks are controlled simultaneously and in the same direction while maintaining the relative positions of the roll chocks of the rolls constituting the upper roll system. The second step corresponds to the second step shown in FIG. 1B, and may be carried out in the same manner as the third adjustment of the four-stage rolling mill shown in FIG. 7C.
[0158]
　As described above, the present invention can be applied not only to a 4-stage rolling mill but also to a 6-stage rolling mill. Further, the present invention is similarly applicable to a 4-step rolling mill and a 6-step rolling mill, and is also applicable to, for example, an 8-step rolling mill or a 5-step rolling mill.
Description of the sign
[0159]
　1 Upper work roll
　2 Lower work roll
　3 Upper reinforcement roll
　4 Lower reinforcement roll
　5a Upper work roll chock (work side)
　5b Upper work roll chock (drive side)
　6a Lower work roll chock (work side)
　6b Lower work roll chock (drive side)
　7a Upper Reinforcing roll chock (working side)
　7b Upper reinforcing roll chock (driving side)
　8a Lower reinforcing roll chock (working side)
　8b Lower reinforcing roll chock (driving side)
　9 Upper working roll chock pressing device
　10 Lower working roll chock pressing device
　11 Upper working roll chock driving device
　12 Lower Work roll chock drive device
　13 Upper reinforcement roll chock pressing device
　14 Upper reinforcement roll chock drive device
　15 Roll chock rolling direction force control device
　16 Roll chock position control device
　21 Drive electric motor
　21a Upper drive electric motor
　21b Lower drive electric motor
　22 Drive electric motor control device
　23 Roll-to-roll cross control device
　30 Housing
　31a Upper spindle torque measuring device
　31b Lower spindle torque measuring device
　40 Lower reinforcing roll chock pressing device
　41 Upper intermediate roll
　42 Lower intermediate roll
　43 Upper intermediate roll chock
　43a Upper middle roll chock (working side)
　43b Upper middle roll chock (driving side)
　44 Lower middle roll chock
　44a Lower middle roll chock (working side)
　44b Lower middle roll chock (driving side)
　50 Reduction device
　61a Entering side Upper increment bending device
　61b Outing side upper Increase bending device
　62a Inlet side lower Increase bending device
　62b Out side lower Increase bending device
　63 Roll bending control device
　71 Up and down load measuring device
　73 Lower pressure downward load measuring device
The scope of the claims
[Claim 1]
　A method of setting a rolling mill, the
　rolling mill is a
　four-stage or higher rolling mill having a plurality of rolls including at least a pair of working rolls and a pair of reinforcing rolls supporting the working rolls, and is to
　be rolled. A plurality of rolls provided on the upper side in the rolling direction with respect to the material were designated as an upper roll system, and
　a plurality of rolls provided on the lower side in the rolling direction with respect to the material to be rolled were designated as a lower roll system and
　arranged in the rolling direction. Using any one of the rolls as a reference roll,
　a torque measuring device for measuring the torque acting on the working roll by driving a motor for driving the working roll, and
　at least on the lower side or the upper side of the rolling mill. ,
　A rolling load measuring device provided on the working side and the driving side to measure the rolling load in the rolling direction , and at least one of the rolling direction entry side and exit side with respect to the roll chock of the roll other than the reference roll. A pressing device for pressing the material to be rolled in the rolling direction and a
　roll chock of the roll other than the reference roll are provided so as to face the pressing device in the rolling direction, and the roll chock is pressed against the material to be rolled.
It is equipped with a roll chock drive device for moving in the rolling direction of the rolling chocks, which
　is carried out before the rolling reduction position is adjusted or before the start of rolling, and
　the roll gap of the working roll is opened to open the upper roll system and the lower roll system. In each
　In the roll system on the side where the reduction direction load measuring device is installed, the torque acting on the work roll is measured by the torque measuring device, or the pair of working rolls differ depending on the reduction direction load measuring device. The reduction direction load in one rotating state is measured on the working side and the driving side, respectively, and in
　the roll system on the side where the reduction direction load measuring device is not installed, the torque measuring device acts on the working roll. The torque is measured and
　fixed with the rolling direction position of the roll chock of the reference roll as the reference position, and the torque or the reduction direction load difference which is the difference between the reduction direction load on the working side and the reduction direction load on the drive side. The first step of adjusting the position of the roll chock by moving the roll chock of the roll other than the reference roll by the roll chock drive device, and
　after performing the first step, the work roll is moved. In the kiss
　roll state, the reduction direction load measuring device measures the reduction direction load of the pair of work rolls in two different rotation states on the work side and the drive side, respectively, and
　the rolling direction of the roll chock of the reference roll. The position is fixed as a reference position, and the roll chock of each roll of the roll system opposite to the reference roll is held at a relative position between the roll chocks so that the reduction load difference is within a predetermined allowable range. A
method for setting a rolling mill , which includes a second step of adjusting the position of the roll chock by moving the roll chock in the same direction at the same time by the roll chock drive device .
[Claim 2]
　The method for setting a rolling mill according to claim 1, wherein the roll located at the bottom or the top of the plurality of rolls in the rolling direction is the reference roll.
[Claim 3]
　In the four-stage rolling mill, when the working rolls are independently driven by different motors, in
　the first step, the positions of the roll chocks of the upper roll system and the positions of the roll chocks of the lower roll system are set. In
　the roll system on the side where the rolling down load measuring device is installed, which are adjusted simultaneously or separately, the rolling down load difference is within a predetermined allowable range, or the torque value is set. The position of the roll chock of the roll other than the reference roll is adjusted
　so as to be the minimum, and the torque value is minimized in the roll system on the side where the rolling load measuring device is not installed. The method for setting a rolling mill according to claim 2, wherein the position of the roll chock of the roll other than the reference roll is adjusted.
[Claim 4]
　When the pair of working rolls are simultaneously driven by one motor in the four-stage rolling mill, in
　the first step, the positions of the roll chock of the upper roll system and the position of the roll chock of the lower roll system are different. In
　the roll system on the side where the rolling down load measuring device is installed, which are adjusted separately, the rolling down load difference is within a predetermined allowable range, or the torque value is minimized. In addition to the reference roll, in
　the roll system on the side where the position of the roll chock of the roll other than the reference roll is adjusted and the rolling load measuring device is not installed, the torque value is minimized. The method for setting a rolling mill according to claim 2, wherein the position of the roll chock of the roll is adjusted.
[Claim 5]
　The rolling mill is a six-stage rolling mill having an intermediate roll between the working roll and the reinforcing roll in the upper roll system and the lower roll system, respectively, and the
　working rolls are independent by different motors. In
　the first step, 　the first adjustment for adjusting the positions of the roll chock of the intermediate roll and the roll chock of the reinforcing roll and the first adjustment for
　each of the upper roll system and the lower roll system are performed 　. After performing one adjustment, a second adjustment for adjusting the position of the roll chock of the intermediate roll and the roll chock of the working roll is performed, and in 　the first adjustment, the rolling 　load measuring device is installed. With respect to the roll system on the side of the 　work roll, the roll chock of the working roll and the roll chock of the intermediate roll are set so that the value of the torque is minimized or the load difference in the rolling direction is within a predetermined allowable range. The position of the roll chock is adjusted simultaneously and in the same direction while maintaining the relative position between the roll chocks, or the position of the roll chock of the reinforcing roll that is not the reference roll is adjusted, and the rolling 　load measuring device is installed. For the roll system on the non- 　existing side, the positions of the roll chocks of the working roll and the roll chocks of the intermediate roll are simultaneously and in the same direction while maintaining the relative positions between the roll chocks so that the torque value is minimized. Adjusted,

Alternatively, the position of the roll chock of the reinforcing roll that is not the reference roll is adjusted, and in
　the second adjustment, the 　torque value becomes the minimum
　for the roll system on the side where the rolling load measuring device is installed.
The position of the roll chock of the working roll is adjusted so that the load difference in the rolling direction is within a predetermined allowable range,
or the roll chock of the reinforcing roll and the roll chock of the intermediate roll which are not the reference rolls. The position of and is adjusted in the same direction at the same time while maintaining the relative position between the roll chocks, and the 　torque value is minimized
　for the roll system on the side where the rolling load measuring device is not installed.
In addition, the position of the roll chock of the working roll is adjusted,
or the positions of the roll chock of the reinforcing roll that is not the reference roll and the roll chock of the intermediate roll are simultaneously and in the same direction while maintaining the relative position between the roll chocks. The method for setting the rolling mill according to claim 2, wherein the rolling mill is adjusted to.
[Claim 6]
　The rolling mill is a six-stage rolling mill in which an intermediate roll is provided between the working roll and the reinforcing roll in the upper roll system and the lower roll system, respectively, and the
　pair of working rolls is driven by one motor. When driven at the same time, in
　the first step, 　the first adjustment for adjusting the positions of the roll chock of the intermediate roll and the roll chock of the reinforcing roll and the first adjustment
　are performed separately for the upper roll system and the lower roll system 　. After performing the adjustment, a second adjustment for adjusting the positions of the roll chock of the intermediate roll and the roll chock of the working roll is performed, and in 　the first adjustment, the 　side where the rolling load measuring device is installed. In the roll system of the 　above, the positions of the roll chock of the working roll and the roll chock of the intermediate roll are set so that the value of the torque is minimized or the load difference in the rolling direction is within a predetermined allowable range. , While maintaining the relative position between the roll chocks, they are adjusted in the same direction at the same time, or the position of the roll chocks of the reinforcing roll that is not the reference roll is adjusted, and the rolling 　direction load measuring device is not installed. With respect to the roll system, 　the positions of the roll chock of the working roll and the roll chock of the intermediate roll are adjusted simultaneously and in the same direction while maintaining the relative positions between the roll chocks so that the torque value is minimized.

Alternatively, the position of the roll chock of the reinforcing roll that is not the reference roll is adjusted, and in
　the second adjustment, the 　torque value becomes the minimum
　for the roll system on the side where the rolling load measuring device is installed.
The position of the roll chock of the working roll is adjusted so that the load difference in the rolling direction is within a predetermined allowable range,
or the roll chock of the reinforcing roll and the roll chock of the intermediate roll which are not the reference rolls. The position of and is adjusted in the same direction at the same time while maintaining the relative position between the roll chocks, and the 　torque value is minimized
　for the roll system on the side where the rolling load measuring device is not installed.
In addition, the position of the roll chock of the working roll is adjusted,
or the positions of the roll chock of the reinforcing roll that is not the reference roll and the roll chock of the intermediate roll are simultaneously and in the same direction while maintaining the relative position between the roll chocks. The method for setting the rolling mill according to claim 2, wherein the rolling mill is adjusted to.
[Claim 7]
　A four-stage or higher rolling mill having a plurality of rolls, including at least a pair of working rolls and a pair of reinforcing rolls supporting the working rolls, and
　any one of the rolls arranged in the rolling direction. the relative roll,
　and a torque measuring device for measuring the torque acting on the work roll by the driving of the motor for driving the work rolls,
　at least the rolling mill in the lower side or upper side, provided on the working side and the driving side ,
　A rolling load measuring device for measuring the rolling load in the rolling direction and a roll chock of the roll other than the reference roll are provided on either the entry side or the exit side in the rolling direction to roll the material to be rolled.
　A roll chock drive device that is provided so as to face the pressing device in the rolling direction with respect to the pressing device that presses in the direction and at least the roll chock of the roll other than the reference roll, and moves the roll chock in the rolling direction of the material to be rolled. And,
　the rolling direction position of the roll chock of the reference roll is fixed as a reference position, and the torque and the reduction direction load difference which is the difference between the reduction direction load on the work side and the reduction direction load on the drive side are obtained. A rolling mill comprising a roll chock position control device that controls the roll chock drive device and adjusts the position of the roll other than the reference roll in the rolling direction
.
[Claim 8]
　The rolling mill according to claim 7, wherein the upper work roll and the lower work roll are driven by different motors independently in the vertical direction.
[Claim 9]
　The rolling mill according to claim 7, wherein the upper work roll and the lower work roll are driven up and down at the same time by one motor.