Technical field
[0001]
　The present invention relates to a method of cooling devices and cooling the steel.
　The present application, 2014 October 7 2014-206255 Japanese Patent Application No., filed in Japan on the day, on October 7, 2014 Japanese Patent Application No. 2014-206256, filed in Japan, in Japan on October 16, 2014 based on the Japanese Patent application No. 2014-211903, filed in Japan, filed a Japanese Patent application No. 2014-211900 and October 16, 2014 and claims the benefit of priority, which is incorporated herein by reference.
Background technique
[0002]
　In recent years, the structural steel used in building materials and machinery parts, light weight and high strength are required. For example, in the automotive steel is one of the structural steel, in addition to the growing safety requirements, CO at the time of manufacturing in order to reduce the impact on the environment with respect to the vehicle body 2 to suppress the emission of the request It is growing. To meet the above requirements, additional weight and higher strength of automotive steel is required.
[0003]
　On the other hand, the structure of automotive steel, compared with the previous, have diversified and complex. Such for use in automotive steel, capable bending technique bending a steel material to diverse and complex shapes are required.
[0004]
　Conventionally, as a bending technique described above, the steel was subjected to bending while locally heating, by quenching with water immediately, bending techniques are used to form a predetermined shape including a bent steel ing. According to this bending technique, it is possible bending a steel material into complex shapes, are possible weight and high strength steel. Furthermore, according to the above-described bending processing technology, it is excellent in productivity since it is possible to apply a bending against steel in one step.
[0005]
　Patent Document 1, while extruding a steel which is rotatably held by the supporting device from an upstream side, a heating device provided on the downstream side of the supporting device, with a cooling device and the movable roller die, bend against steel bending technique is disclosed for machining. In bending technique of Patent Document 1, the steel to form a heated portion by heating locally by a heating device, after applying a bending moment with respect to the heated portion by the movable roller die, with respect to the heated portion method for cooling the heated portion is disclosed by injecting a cooling medium from the cooling device Te.
[0006]
　Patent Document 2, after forming the heated portion in the steel by the heating device, between the cooling device with respect to the heated portion to blow a cooling medium, inert gas or reducing with respect to the heated portion to suppress oxidation of the heated portion surface by blowing gas, a method of suppressing the scale occurs is disclosed in the heated surface.
[0007]
　Patent Document 3, extruded while heating the tube of steel or the like fitted to the guide having a curved portion in thermoforming furnace, after forming along the curved portion, such as steel by injecting a cooling medium method of cooling is disclosed a tube.
　Patent Document 4, a header having nozzles for jetting a cooling medium to the steel material using a cooling device of a plurality provided the steel in the longitudinal direction of the steel material, a method of cooling the steel is disclosed. Cooling device steel of Patent Document 4 has an openable coolant supply system independently at least two systems or more, by connecting and either the header and the cooling medium supply system, the position of the longitudinal steel it is possible to change the cooling rate by. The cooling apparatus of steel in Patent Document 4 is a cooling device for cooling the bending is not performed steel (straight pipe).
CITATION
Patent Document
[0008]
Patent Document 1: Japanese Laid-Open Patent Publication No. 2007-83304
Patent Document 2: Japanese Laid-Open Patent Publication No. 2011-89151
Patent Document 3: Japanese Laid-Open Patent Publication No. 8-10856
Patent Document 4: Japanese Patent Laid-Open 2006-283179 Bulletin No.
Summary of the Invention
Problems that the Invention is to Solve
[0009]
　However, we are measuring the temperature of the steel was subjected to collision pressure measurement and numerical analysis such as a cooling medium injected into the heated portion, the cooling method of steel in Patent Document 1, bending of insufficient cooling during processing Therefore, the finding that there is a case where unevenness baked bending member manufactured by carrying out bending with respect to the steel material, that is, unevenness of the steel material structure occurs. Specifically, it was found that unevenness baked on the outside of the bending of the bending element may occur.
　Figure 22 is a cooling method of a steel material 200 of Patent Document 1 is a schematic diagram showing a manner of cooling the steel material 200.
　As shown in FIG. 22, when cooling steel 200 by the cooling device 210, the injected cooling medium from the cooling device 210 moves straight in the feed direction of the steel material 200 (X-axis direction in FIG. 22). The cooling method shown in FIG. 22, the cooling medium to the outer circumferential surface 201 (the region surrounded by a dotted line in FIG. 22) of the bending of the steel material 200 do not collide, the outer peripheral surface 201 of the bending becomes insufficient cooling, steel grilled uneven to 200. Particularly, when bending a steel material 200 into complex shapes, if the feeding speed of the steel product 200 is fast, easily occurs unevenness baked steel material 200.
[0010]
　In a method of cooling steel 200 of Patent Document 2, similarly to the cooling method of steel 200 of Patent Document 1, there is a case where unevenness baked steel material 200 occurs.
　The cooling method of a steel material 200 of Patent Document 2, for injecting the cooling medium from two locations along the feed direction of the steel material 200. When viewed in the feed direction of the steel material 200, referred to as more injection position of the cooling medium located upstream the first position, it referred to more coolant injection position located downstream the second position.
　The cooling method of a steel material 200 of Patent Document 2, in the first position, injecting a cooling medium at an angle toward the feed direction of the steel material 200, the cooling medium in the vertical direction to the feeding direction of the steel material 200 at a second location to injection. However, if the bent shape of the steel 200 complex, the cooling medium injected from the first position to collide with the steel material 200, the cooling medium sprayed from the second position may not collide with the steel material 200 is there.
[0011]
　Further, Patent Document 2, a specific control method of the cooling medium is injected from the second position is not disclosed. Therefore, the cooling medium jetted from the second position can not penetrate the cooling medium injected from a first position in which flow along the steel 200, it injected cooling medium from the second position steel materials 200 it is also conceivable that does not reach to.
　For the reasons mentioned above, even in the cooling method of steel 200 in Patent Document 2, similarly to the cooling method of steel 200 of Patent Document 1, without cooling medium on the circumferential surface of the outer bend collision, the outer bend periphery since the surface becomes insufficient cooling, there is a case where unevenness baked steel material 200 occurs.
[0012]
　The cooling method of a steel material 200 of Patent Document 3, a pair of hollow annular bodies nozzle provided inside, injecting a cooling medium with respect to the steel material 200 for inserting the inner hollow annular body. A pair of hollow annular body is disposed being shifted back and forth in accordance with the bent shape of the steel 200. Therefore, when bending a steel material 200 in a direction different from the direction in which the pair of hollow ring body is provided, along with steel 200 during bending may contact the hollow ring body, bending the outer of the cooling medium on the circumferential surface does not collide, the outer bending becomes insufficient cooling, there is a possibility that the baked unevenness in steel 200.
　Cooling method of steel 200 in Patent Document 4, since bending is a cooling method for cooling the non steel (straight pipe) 200 subjected when bent is used to cool the steel 200 subjected, without cooling medium on the circumferential surface of the outer bend collision, there is a possibility that burnt unevenness.
[0013]
　The present invention has been made in view of the above circumstances, and an object thereof is to provide a cooling apparatus and cooling method capable steel to reduce the baked unevenness of the steel material.
Means for Solving the Problems
[0014]
　The present invention is to solve the above problems, adopts the following means in order to achieve the object.
(1) cooling system for steel according to one embodiment of the present invention, the while heating the longitudinal portion of the steel material while feeding the steel while holding one end portion of the elongated steel material in the longitudinal direction after the end portion is formed into a predetermined shape including a bend by moving the two-dimensional or three-dimensional direction, a cooling device for cooling the heated portion including the bend, first to the heated portion 1 the first cooling device for injecting a cooling medium, disposed downstream of the first cooling device when viewed in the feed direction of the steel product, second cooling to the heated portion and a second cooling device for injecting medium. The second cooling device, the a plurality arranged along the feeding direction, and the flow rate of one another independently of the second cooling medium is controllable.
[0015]
(2) In the above (1) cooling system for steel described in between the adjacent respective second cooling device to each other while maintaining the arrangement distance constant, respectively, the arrangement of the second cooling unit for the predetermined further comprising forming the mobile mechanism to follow the shape may be adopted.
[0016]
(3) In the cooling apparatus of steel according to the above (2), the moving mechanism, follow the above arrangement of the second cooling device to the predetermined shape of the steel by contacting the outer shape of the steel a contact portion which may be adopted a structure which is passive movement mechanism having a connecting portion for connecting the respective second cooling device adjacent to each other.
[0017]
(4) In the cooling apparatus of steel according to the above (2), the moving mechanism, follow the above arrangement of the second cooling device to the predetermined shape of the steel by contacting the outer shape of the steel a contact part for, the may be adopted a passive movement mechanism having a guide portion for defining the moving direction of the second cooling device.
[0018]
(5) In the above (2) cooling device steel according to the moving mechanism, in response to the predetermined shape of the plan given to the steel, the driving unit for moving the respective second cooling device a configuration may be adopted an active movement mechanism having.
[0019]
(6) In the cooling apparatus of steel according to any one aspect of the above (1) to (5), the second cooling device, and with a plurality arranged along the circumferential direction of the steel material, cross each the independent second cooling medium may be adopted a configuration including a cooling mechanism to flow controllably injected.
[0020]
(7) In the cooling apparatus of steel according to (6), wherein the cooling mechanism between the from the cooling mechanism through to the steel, the second cooling medium to be ejected from the respective cooling mechanism each other may be adopted being arranged so as not to cross each other.
[0021]
In the cooling apparatus of steel according to any one aspect of (8) above (1) to (7), when said each second cooling device viewed along the feed direction, relatively upstream who is the second cooling device and the second cooling device downstream side of the can may be adopted inner diameter of the space in which the steel material is inserted is larger.
[0022]
(9) above (1) In the cooling device of steel according to any one aspect to (8), said second cooling ejected from those in the most upstream position among the second cooling device upstream position than collision position and said a medium steel, may be adopted further having a first draining mechanism for draining said first cooling medium towards the downstream side.
[0023]
(10) In (1) to the cooling system of the steel according to any one aspect of (9), wherein said second cooling medium is injected from one of the second cooling device steel downstream position than the collision position with, a configuration may be adopted in further including a plurality of second draining mechanism for draining the second cooling medium towards the downstream side.
[0024]
(11) In the cooling apparatus of steel according to any one aspect of the above (1) to (10), wherein at least one of the second cooling device, imparts pulsation to said second cooling medium a configuration may be adopted with a pulsation grant mechanism.
[0025]
(12) In the cooling apparatus of steel according to any one aspect of the above (1) to (11), at least, the most upstream position momentum of what is injected at the most upstream position of the second cooling medium of a large configuration than the momentum of the first cooling medium to be injected into the adjacent position may be adopted.
[0026]
(13) In the cooling apparatus of steel according to any one aspect of the above (1) to (12), said first cooling medium is a columnar jet, the second cooling medium, flat-shaped jets, may be employed a full cone-shaped jet, and oval-shaped jets, the structure is either.
[0027]
(14) The method of cooling steel according to one embodiment of the present invention, the while heating the longitudinal portion of the steel material while feeding the steel while holding one end portion of the elongated steel material in the longitudinal direction after the end portion is formed into a predetermined shape including a bend by moving the two-dimensional or three-dimensional direction, a cooling method for cooling the heated portion including the bend, first to the heated portion 1 of the first cooling step for injecting a cooling medium, said and a downstream side of the ejection position of the first cooling medium when viewed along the feed direction, a second cooling to the heated portion and a second cooling step for injecting media. In the second cooling step, the steel material, injecting the second cooling medium while independently controlling the flow rate to each other with respect to a plurality of locations along said feeding direction.
[0028]
(15) In the cooling method of steel according to the above (14), the second cooling step, in the feed direction at the time of injecting the second cooling medium with respect to a plurality of locations along said feeding direction while maintaining the injection interval constant, respectively, may be adopted comprising a transfer step to follow the arrangement of the collision position of the relative said steel second cooling medium to the predetermined shape of the steel.
[0029]
(16) In the cooling method of steel according to the above (15), said moving step, the predetermined shape of the steel obtained by contacting the outer shape of the steel by injecting the second cooling medium along said feed direction is reflected in the arrangement of the second cooling device in which a plurality arranged, wherein by the second cooling device is connected, the injection interval in the feeding direction of the second cooling medium the structure is a passive movement step of each is kept constant may be adopted.
[0030]
(17) In the cooling method of steel according to the above (15), said moving step, the predetermined shape of the steel obtained by contacting the outer shape of the steel by injecting the second cooling medium along said feed direction is reflected in the arrangement of the plurality arranged respective second cooling device, a moving direction of the second cooling device may be adopted a passive moving process as defined by the guide .
[0031]
(18) In the cooling method of steel according to the above (15), wherein the moving step, in response to the predetermined shape of the plan given to the steel, active the ejection position of the second cooling medium a configuration may be adopted an active movement step of moving the.
[0032]
(19) In the above (14) to the cooling method of steel according to any one aspect of (18), in the second cooling step, a plurality of positions along the circumferential direction of the steel the second cooling medium more may be adopted a configuration in which flow controllably injected independently of one another.
[0033]
(20) In the cooling method of steel according to the above (19), so that the second cooling medium adjacent to each other in the circumferential direction does not intersect one another until impinging on the steel, the second the configuration in which the injection position of the cooling medium are arranged may be adopted.
[0034]
(21) (14) in the cooling method of the steel according to any one aspect to (20), upstream of the collision position of the steel to be in the most upstream position of the second cooling medium in the position, a configuration may be adopted that further comprises a first draining step of draining said first cooling medium towards the downstream side.
[0035]
(22) In the above (14) to the cooling method of steel according to any one aspect of (21), in each of a plurality of locations, the downstream position than the collision position between the steel and the second cooling medium, said second cooling medium toward the downstream side may be adopted further including a plurality of second draining step of draining.
[0036]
In the cooling method of steel according to any one aspect of (23) above (14) to (22), the arrangement further comprising a pulsation step of applying a pulsation to at least one of said second cooling medium it may be adopted.
[0037]
(24) In the above (14) to the cooling method of steel according to any one aspect of (23), at least, the most upstream position momentum of what is injected at the most upstream position of the second cooling medium of a large configuration than the momentum of the first cooling medium to be injected into the adjacent position may be adopted.
Effect of the Invention
[0038]
　According to the above embodiment, it is possible to provide a steel material method of a cooling device and cooling which can reduce the shrink unevenness in bending of the steel.
BRIEF DESCRIPTION OF THE DRAWINGS
[0039]
FIG. 1 is a schematic diagram showing the configuration of a bending device provided with a cooling device according to the first embodiment.
FIG. 2 is a schematic diagram showing a configuration of a first cooling device according to the first embodiment.
3 is a schematic diagram showing a configuration of a first cooling mechanism according to the first embodiment.
[4] The first cooling mechanism according to the first embodiment is a schematic diagram showing the state of injecting a second cooling medium.
5 is a schematic diagram showing a configuration of a second cooling mechanism according to the first embodiment.
6 is a schematic view showing a state of cooling the steel material with the first cooling device and according to the first embodiment and the second cooling device.
7 is a schematic diagram showing a schematic configuration of a bending device provided with a cooling device according to the second embodiment.
[8] by using the bending apparatus provided with a cooling device according to the second embodiment is a schematic diagram showing a state of performing bending against steel.
[9] in a state in which bending is not performed on the steel, which is a schematic diagram showing a schematic configuration of a second cooling device according to the second embodiment.
FIG. 10 is a schematic diagram showing a configuration of a first cooling mechanism according to the second embodiment.
11 is a schematic diagram showing a configuration of a second cooling mechanism according to the second embodiment.
It is a schematic view showing a state of cooling the steel material with a second cooling device according to the second embodiment comprises a [12] contact member and the connecting member.
13 is a schematic diagram showing a configuration of a second cooling device according to the first modification of the second embodiment.
14 is a schematic diagram showing a configuration of a second cooling device according to a second modification of the second embodiment.
15 is a schematic view showing a bending apparatus of the steel with a cooling device for a steel material according to the third embodiment.
FIG. 16 is a schematic diagram showing a configuration of a first draining mechanism.
17 is a schematic diagram showing the state of cooling the steel material using a cooling device according to a third embodiment.
18 is a schematic diagram showing a schematic configuration of a bending device provided with a cooling device according to the fourth embodiment.
19 is a schematic view showing a state of cooling the upper surface of the steel with a cooling device according to the fourth embodiment.
FIG. 20 is a schematic diagram showing the configuration of a bending device provided with a cooling device according to a first modification of the fourth embodiment.
21 is a schematic diagram showing a configuration of a first cooling mechanism and the moving mechanism according to a first modification of the fourth embodiment.
FIG. 22 is a schematic diagram showing the state of cooling the steel material by using a cooling method of a steel material of Patent Document 1.
FIG. 23 is a schematic diagram showing the configuration of a bending device comprising a second cooling device according to the second modification of the fourth embodiment.
It is a schematic diagram showing a configuration of a [24] bending device provided with a cooling device according to a fifth embodiment.
[FIG 25 is a schematic diagram showing a configuration of a first cooling mechanism according to a fifth embodiment.
FIG. 26 is a schematic view showing a state of cooling the upper surface of the steel with a cooling device according to a fifth embodiment.
FIG. 27 is a schematic diagram showing the structure of a bending apparatus when a cooling device according to the fifth embodiment has a control unit.
[Figure 28] cooling device according to the fifth embodiment is a schematic diagram showing the structure of a bending apparatus when provided with the moving mechanism.
FIG. 29 is a schematic diagram showing the configuration of the first cooling mechanism and moving mechanism according to the fifth embodiment.
FIG 30 is a schematic diagram showing the structure of a bending apparatus when a cooling device according to the fifth embodiment is provided with a pulsation applying mechanism.
[FIG. 31] is a graph showing the results of Example 1-1.
[FIG. 32] is a graph showing the results of comparative examples 1-1.
[FIG 33 is a graph showing the results of Examples 2-1,2-1 and Comparative Examples 2-1.
FIG. 34 is a graph showing the results of Example 3-1.
DESCRIPTION OF THE INVENTION
[0040]
　Hereinafter, a cooling method of the cooling device and the steel of the steel according to the embodiment will be described with reference to the accompanying drawings.
　(First embodiment, the steel cooling device)
　First, the bending apparatus including a cooling device of steel 10 according to the first embodiment will be described with reference to FIG.
　Figure 1 is a schematic view showing a bending apparatus 1 of the configuration comprising a cooling device for a steel material 10 in the first embodiment.
[0041]
　Bending apparatus 1, while feeding the steel 10 of the elongated intermittently or continuously performs the bending of steel 10. When the bending apparatus 1, as seen in the feed direction of the steel material 10, in order from the upstream side, a feeding device 20, a heating device 21, a first cooling device 22, a second cooling device 23, bending and a device 24.
　In the present embodiment, the steel material 10 that longitudinally feeding direction (X-axis direction in FIG. 1) to be sent to (tube axis direction). Incidentally, unless otherwise specified, refers upstream side in the feed direction of the steel 10 (X-axis negative direction side in FIG. 1) is an upstream side and a downstream side downstream in the feeding direction of the steel material 10 (in FIG. 1 X-axis refers to the positive side).
　Configuration of the bending apparatus 1 is not limited to the structure described above. Also, if in the present embodiment will be described steel material 10 is a flat steel (flat tubes), for example, steel 10 round tube or when the steel material 10 is a steel pipe such as Kukei Kan no tubular also it can be applied.
[0042]
　(Feeder)
　feeding device 20, the steel 10 having one end portion (distal end portion) is gripped by the bending apparatus 24, sends out intermittently or continuously in the longitudinal direction (tube axis direction). Feeder 20 may employ a known structure, not intended to be limited to the particular configuration. Incidentally, as shown in FIG. 1, the feed device 20, the other end portion of the steel material 10 (rear end) may be gripped.
[0043]
　(Heating device)
　the heating device 21, for example by high-frequency induction heating coil provided annularly around the steel 10 to heat the longitudinal direction of a portion of the steel material 10.
[0044]
　(Bending apparatus)
　bending apparatus 24 grips the leading end portion of the steel material 10, the distal end portion of the steel material 10 is moved in two-dimensional directions or three-dimensional direction to form a bent steel 10 (bent portion) 11. Bending apparatus 24 includes a clamp 25 for gripping the leading end portion of the steel material 10, and a driving arm 26 for moving the clamp 25.
[0045]
　(Cooler)
　cooling device for a steel material 10 according to the present embodiment includes a first cooling device (primary cooling device) 22 and a second cooling device (secondary cooling device) 23.
　First cooling device 22, the longitudinal direction of a portion of the steel material 10 heated by the heating device 21 (hereinafter, referred to as the heated part) injecting a first cooling medium 35. Note that the heated portion include bend 11.
[0046]
　Second cooling device 23, when viewed in the feed direction of the steel material 10, than the first cooling device 22 provided on the downstream side to inject the second cooling medium 55 against the heated portion . Second cooling device 23, a plurality arranged along the feeding direction of the steel material 10, a cooling mechanism capable of controlling the flow rate of the second cooling medium 55 independently of one another. Second cooling device 23 shown in FIG. 1 includes a first cooling mechanism 40 and the second cooling mechanism 41.
　As the first cooling medium 35 and the second cooling medium 55, it is preferable to use cooling water.
　The detailed configuration of the first cooling device 22 and the second cooling device 23 will be described later.
[0047]
　In the bending apparatus 1, while holding the distal end portion of the steel material 10 by a clamp 25 feeds the steel 10 by feeder 20. The fed steel 10 is heated to a predetermined temperature by the heating device 21. Furthermore, the drive arm 26 by moving the clamp 25 in the two-dimensional directions or three-dimensional direction, bending moment in the heated portion of the steel material 10 is applied. Thus, it is formed into a predetermined shape including bending 11 steel 10. After the bending moment is applied to the heated portion of the steel material 10, steel 10 is cooled by the first coolant 35 ejected from the first cooling device 22, it is further injected from the second cooling device 23 It is cooled by the second cooling medium 55.
　In the present embodiment, the cooling referred to as the primary cooling of steel 10 according to the first cooling medium 35, the cooling of the secondary cooling of the steel 10 of the second cooling medium 55.
[0048]
　Next, a description will be given of a first cooling device 22 and a second cooling device 23 according to this embodiment. Figure 2 is a schematic diagram showing a configuration of a first cooling device 22 according to this embodiment. Figure 3 is a schematic diagram showing a configuration of a first cooling mechanism 40 of this embodiment. Figure 4 is a schematic diagram showing how a first cooling mechanism 40 of this embodiment is to inject the second cooling medium 55. Figure 5 is a schematic diagram showing the configuration of the second cooling mechanism 41 according to this embodiment.
[0049]
　(First cooling device)
　first cooling device 22 as shown in FIG. 2 are provided annularly around the steel 10 has a header 30 for supplying the first cooling medium 35. The side surface 31 of the downstream side in the header 30, the discharge port 32 for injecting a first cooling medium 35 of the columnar jets are formed. The side surface 31 of the first cooling device 22, when viewed in the feed direction of the steel material 10 is inclined so as to be positioned upstream of the inner end portion 31a outer end 31b. Therefore, the first cooling medium 35 injected from the plurality of discharge ports 32 is injected toward the downstream side.
　By injecting a first cooling device 22 from the first cooling medium 35 having the above configuration, the first cooling medium 35 can be prevented from flowing toward the upstream side. Therefore, without inhibiting the heating of the steel material 10 by the heating device 21, it is possible to perform primary cooling of steel 10 according to the first cooling device 22.
[0050]
　(Second cooling device)
　as shown in FIG. 1, the second cooling device 23, a first cooling mechanism 40 and the second cooling mechanism 41 is arranged from the upstream side arranged in order. The first cooling mechanism 40 and the second cooling mechanism 41, it is possible to inject the second cooling medium 55 independently of one another, the flow velocity and flow rate of the second cooling medium 55 independently of one another it is possible to control. The number of the cooling mechanism is not limited to the example of the present embodiment can be arbitrarily set.
[0051]
　(First cooling mechanism)
　As shown in FIG. 3, the first cooling mechanism 40 constituting the second cooling device 23, a plurality arranged along the circumferential direction of the steel material 10, the second cooling medium 55 it may comprise a supply header 50-53. If the first cooling mechanism 40 has a header 50 to 53 upper header 50 is disposed vertically above the steel 10, the lower header 51 is disposed vertically below the steel 10, the side headers 52 and 53, respectively They are arranged horizontally side of the steel material 10. Each header 50-53, it is possible to inject the second cooling medium 55 independently of one another, to control the flow rate and the flow rate of the second cooling medium 55 independently of one another.
　By first cooling mechanism 40 comprises a header 50-53, it is possible to reliably cool the circumferential entire direction of the steel material 10. Therefore, even when the steel 10 is formed in a complicated shape, it is possible to reduce the baked unevenness occurring in steel 10.
　The number of header 50-53 is not limited to this embodiment, it can be arbitrarily set.
[0052]
　Each header 50-53, spray nozzles 54 are provided. The spray nozzle 54, for example a flat nozzle, full cone nozzle, etc. oval nozzles are used. When the nozzle described above is used as the spray nozzle 54, second cooling medium 55 is flat-shaped jets, respectively, full cone shaped jets are oval jet.
　The number of spray nozzles 54 provided in each header 50-53 is not limited to that shown in FIG. 3, it can be arbitrarily set.
　As shown in FIG. 4, the second cooling medium 55 to flow toward the downstream side may be set the orientation of the spray nozzles 54 of each header 50-53.
[0053]
　Spray nozzles 54 of each header 50-53, the ejection direction of the second cooling medium 55 may be configured to allow adjustment. This makes it possible to inject the second cooling medium 55 in accordance with the shape of the steel material 10, even in the case of forming a steel material 10 in the complex shape, the peripheral surface of the outer bend 11 of steel 10 It may inject a second cooling medium 55. Therefore, even when forming a steel material 10 into complex shapes, it is possible to reduce the baked unevenness when performing bending a steel material 10.
　In particular, the spray nozzles 54 of the upper header 50 and lower header 51, a collision angle θ of the second cooling medium 55 and a steel material 10 ejected from the spray nozzles 54 1 is preferably arranged in the direction is below 45 degrees . Impact angle θ between the second cooling medium 55 and the steel member 10 1 by a below 45 degrees, it is possible to prevent the second cooling medium 55 that has collided with the steel 10 flows to the upstream side. Incidentally, the collision angle θ of the second cooling medium 55 and the steel member 10 1 Preferred lower limit of include 20 degrees.
[0054]
　Each spray nozzle 54 of the header 50-53, until the second coolant 55 ejected from the spray nozzle 54 reaches the steel 10, the second cooling medium 55 with each other to be injected from the spray nozzles 54 There is preferably arranged so as not to cross each other. By thus each spray nozzle 54 is disposed, a second for cooling medium 55 with each other do not interfere with each other, the second desired impact location and impact angle a cooling medium 55 to be injected from the spray nozzles 54 in can be injected into the steel 10.
　Upper header 50 and injection angle θ of the second cooling medium 55 is injected from the spray nozzles 54 of the lower header 51 2 injection angle of the second cooling medium 55 is injected from the spray nozzle 54 and of the side headers 52, 53 theta 3 is preferably 10 to 70 degrees. However, with proper cooling capability of the upper header 50 and lower header 51, to prevent excessive increase in the number of nozzles, the injection angle theta 2 and theta 3 is preferably as wide as possible angle. Incidentally, when the injection angle is increased, there is a possibility that it becomes difficult to uniformly cool the steel 10, the injection accuracy theta 2 and theta 3 is preferably about 50 degrees. However, when the cooling surface of the steel material 10 is narrow, the injection accuracy theta 2 and theta 3 may be about 10 degrees.
[0055]
　(Second cooling mechanism)
　As shown in FIG. 5, the second cooling mechanism 41 with the first cooling mechanism 40 constituting the second cooling device 23 has the same configuration as that of the first cooling mechanism 40 . That is, the second cooling mechanism 41 is provided with a header 60-63 having the same configuration as the header 50-53. Further, each header 60-63 is provided with a spray nozzle 64 having the same structure as the spray nozzle 54.
[0056]
　Incidentally, as shown in FIG. 1, in a first cooling mechanism 40 and the second cooling mechanism 41, the width (space steel 10 is inserted in the direction (Y-axis direction in FIG. 1) perpendicular to the feed direction when comparing inner diameter), than the width D1 of the first cooling mechanism 40 in a relatively upstream side, constructed as towards the width D2 of the second cooling mechanism 41 on the downstream side is increased it may be. Because steel 10 has a large bending width of the downstream side, bending as steel 10 after processing does not contact the second cooling mechanism 41, than the width D1 of the first cooling mechanism 40 width of the second cooling mechanism 41 It is to increase the D2. Note that the width D1 of the first cooling mechanism 40 may be the same as the width D2 of the second cooling mechanism 41.
[0057]
　(First embodiment, the cooling method of steel)
　Next, the method of cooling steel 10 in which the first cooling device 22 according to this embodiment and is performed by using the second cooling device 23, with reference to FIG. 6 explain.
　Figure 6 is a schematic diagram showing a state of cooling the steel material 10 by using a first cooling device 22 according to the first embodiment and the second cooling device 23.
　As shown in FIG. 6, the cooling method of steel 10 according to the present embodiment includes the steps of injecting a first cooling medium 35 with respect to the heated portion, a first cooling when viewed along the feed direction from the downstream side of the ejection position of the medium 35, and a step of injecting a second cooling medium 55 with respect to the heated portion. In the present embodiment, the step of injecting a first cooling medium 35 against the heated portion is called a first cooling step, the step of injecting a second cooling medium 55 against the heated portion that 2 of the cooling process.
　The cooling method of a steel material 10 according to the present embodiment, in the second cooling step, injecting a second cooling medium 55 while independently controlling the flow rate to each other with respect to a plurality of locations along the feed direction of the steel material 10.
[0058]
　As shown in FIG. 6, is heated to a predetermined temperature (e.g., 1000 ° C.) in the heating device 21, the steel 10 a moment is imparted bending, first, a first cooling medium jetted from the first cooling device 22 It is cooled by 35. The cooling by first cooling medium 35, the surface of the steel material 10, Ar 3 is cooled to below the transformation starting temperature (e.g. 200 ~ 800 ℃).
[0059]
　After cooling by first cooling medium 35, steel 10 is cooled by the second coolant 55 ejected from the first cooling mechanism 40 and the second cooling mechanism 41. The second cooling medium 55, steel 10 is cooled to the martensite transformation finish temperature Mf below or near room temperature (e.g., room temperature ~ 300 ° C.). Because it is already lowered the temperature of the steel material 10 by the primary cooling, stably and efficiently steel 10 is cooled by nucleate boiling region in the secondary cooling.
[0060]
　As shown in FIG. 6, in the cooling method of steel 10 according to the present embodiment, with respect to steel 10, for injecting the second cooling medium 55 from the first cooling mechanism 40 and the second cooling mechanism 41. The first cooling mechanism 40 and the second cooling mechanism 41, in accordance with the curvature of the bend 11 in the heated portion, it is possible to control the flow rate distribution of the second cooling medium 55. Thus, in the cooling method of steel 10 according to the present embodiment, it has been difficult in the conventional cooling, it is possible to outward cooled reliably bend 11 of steel 10.
　For the reasons mentioned above, according to the cooling method of steel 10 of the present embodiment, it is possible to reduce the shrink unevenness during bending of the steel material 10 has been a problem of the prior art. Therefore, it is possible to apply with respect to the steel 10, an appropriate bending.
[0061]
　When compared with the momentum of momentum and the second cooling medium 55 of the first cooling medium 35, first injected from the first cooling mechanism 40 at the most upstream position of the at least second cooling device 23 2 momentum of the cooling medium 55, the first is greater than the momentum of the cooling medium 35 injected from the first cooling device 22 at the position adjacent to the first cooling mechanism 40 preferably.
[0062]
　Momentum of the second coolant 55 ejected from the first cooling mechanism 40, first by greater than the momentum of the cooling medium 35 injected from the first cooling device 22, a first cooling mechanism 40 second cooling medium 55 that is injected during the collision with the steel 10, even if the first cooling medium 35 is present between the second cooling medium 55 and a steel 10, a first cooling mechanism 40 second cooling medium 55 injected from is possible to penetrate the first cooling medium 35.
　Thus, the second cooling medium 55 injected from the first cooling mechanism 40 to reliably reach the steel 10, cooling the first coolant 35 temperature has risen by cooling the steel material 10 is first since not flow downstream of the mechanism 40, it is possible to cool the steel material 10 efficiently.
　Incidentally, the momentum of the second cooling medium 55 is preferably 1.5 times to 5 times the momentum of the first cooling medium 35.
[0063]
　In the second cooling step, the second cooling medium 55 from the plurality of positions along the circumferential direction of the steel material 10 may flow controllably injected independently of one another. A second cooling medium 55 from the plurality of positions along the circumferential direction of the steel material 10, by independently flow controllably injected another, it is possible to reliably cool the circumferential entire direction of the steel material 10. Therefore, even when the steel 10 is formed in a complicated shape, it is possible to reduce the baked unevenness occurring in steel 10.
[0064]
　(Second Embodiment, steel cooling device)
　will now be described cooling apparatus of steel 10 according to the second embodiment.
　Figure 7 is a schematic diagram showing the structure of a bending apparatus 1 steel 10 provided with a cooling device for a steel material 10 according to the second embodiment. 8, by using the bending apparatus 1 steel 10 provided with a cooling device for a steel material 10 according to the second embodiment is a schematic diagram showing a state of performing bending against steel 10.
　Incidentally, elements having the same configuration as that of the bending apparatus 1 steel 10 according to the first embodiment, and detailed description thereof will be omitted.
[0065]
　Cooling device of steel 10 according to the present embodiment has a first cooling device 22 as in the first embodiment includes a second cooling device 223 differs from the first embodiment.
　The second cooling device 223 according to this embodiment, as shown in FIG. 7 comprises a first cooling mechanism 240, the second cooling mechanism 241 and the third cooling mechanism 242. Furthermore, the second cooling device 223, the center of the first center and the connecting member 290 and the second cooling mechanism 241 for connecting the center of the second cooling mechanism 241 of the cooling mechanism 240 and the third cooling mechanism 242 comprising a connecting member 293 which connects the center of the.
　Since the second cooling device 223 has a coupling member 290,293, as shown in FIG. 8, even when the bending against the steel 10, the first cooling mechanism 240 and the second cooling mechanism 241 center distance and the second cooling mechanism 241 and it is possible to keep the distance between the centers of the third cooling mechanism 242 constant.
[0066]
　Next, the detailed configuration of the second cooling device 223 according to this embodiment.
　9, in a state in which bending is not performed on the steel 10 is a schematic diagram showing a configuration of a second cooling device 223 according to the second embodiment. Figure 10 is a schematic diagram showing a configuration of a first cooling mechanism 240 according to the second embodiment. Figure 11 is a schematic diagram showing a configuration of a second cooling mechanism 241 according to the second embodiment.
[0067]
　As shown in FIG. 9, when viewed in the feed direction of the steel material 10, the second cooling device 223 includes, in order from the upstream side, the first cooling mechanism 240, the second cooling mechanism 241 and the third a cooling mechanism 242. The first cooling mechanism 240, the second cooling mechanism 241 and the third cooling mechanism 242 is similar to the first embodiment for the point can control the flow rate of the second cooling medium 55 independently of one another . The number of the cooling mechanism is not limited to the example of the present embodiment can be arbitrarily set.
[0068]
　As shown in FIG. 10, the first cooling mechanism 240 according to this embodiment is provided annularly around the steel 10, the second cooling medium 55 may have a supply header 250. The side of the feed direction of the steel material 10 in the header 250, discharge port 251 for injecting a second cooling medium 55 in the columnar jets are formed. Second cooling medium 55 injected from the plurality of discharge ports 251 is injected toward the downstream side.
　Also, on the inner surface of the header 250, discharge port 252 for injecting a second cooling medium 55 in the columnar jets are formed. Second cooling medium 55 injected from the plurality of discharge ports 252, as the upper and lower surfaces of the steel material 10 is cooled, is injected toward the vertical direction.
[0069]
　The outer peripheral portion of the header 250, the supply pipes 260-263 are connected for supplying a second cooling medium 55. Upper supply pipe 260, 261 is connected to the upper surface of the header 250, the lower supply pipe 262 is connected to the lower surface of the header 250. Reason for the plurality installing supply tubes 260-263 in the tangential direction of the header 250 is for stabilization and water ensuring the discharge of the second cooling medium 55.
　For example, when viewed in the feed direction of the steel material 10, the second cooling medium 55 is supplied to the header 250 from the upper supply pipe 260 and a lower supply pipe 263 located on a diagonal line of the header 250, the other upper supply pipe 261 and to stop the supply of the second cooling medium 55 from the lower supply pipe 262. In the case of supplying the second cooling medium 55 as described above, since the second cooling medium 55 which is supplied flows swirling annular header 250, a discharge port 251 and 252 of the header 250, steel It can be injected uniformly the second cooling medium 55 in the circumferential direction of 10.
　Note that when supplying the second cooling medium 55 in the header 250 is supplied from the upper supply pipe 261 and a lower supply pipe 262 second cooling medium 55, first from the upper supply pipe 260 and a lower supply pipe 263 the supply of the second cooling medium 55 may be stopped. To ensure the water of the second cooling medium 55 may be supplied to the second cooling medium 55 from all of the supply pipe 260-263.
[0070]
　As shown in FIG. 10, the header 250 is fixed to the second support member 271 through the first support member 270. Therefore, the first cooling mechanism 240 is capable of injecting a second cooling medium 55 without moving.
[0071]
　As shown in FIG. 11, the second cooling mechanism 241 according to this embodiment is provided annularly around the steel 10, the second cooling medium 55 may have a supply header 255. In the header 255, the side of the feed direction of the steel material 10, the discharge port 256 for injecting a second cooling medium 55 in the columnar jets are formed. Second cooling medium 55 injected from the plurality of discharge ports 256 is injected toward the downstream side. Also, on the inner surface of the header 255, discharge port 257 for injecting a second cooling medium 55 in the columnar jets are formed. Second cooling medium 55 injected from the plurality of discharge ports 257, as the upper and lower surfaces of the steel material 10 is cooled, is injected toward the vertical direction.
[0072]
　The outer peripheral portion of the header 255, the supply pipes 265 to 268 are connected to supply the second coolant 55. Upper supply pipe 265 and 266 are connected to the upper surface of the header 255, the lower supply pipe 267 is connected to the lower surface of the header 255. The supply method of the second cooling medium 55 from the supply pipe 265 to 268 to the header 255, the method of supplying the second cooling medium from the supply pipe 260-263 of the first cooling mechanism 240 described above to the header 250 is the same as that.
　Although not shown, the third cooling mechanism 242 has a structure similar to that of the second cooling mechanism 241 described above.
[0073]
　Upstream of the header 255, a pair of contact members (contact portion) 280,280 are provided. The contact member 280 has a substantially triangular shape in side view, in contact with the outer shape of the steel material 10. The contact member 280, without damaging the steel material 10, and material having heat resistance, such as fluorocarbon resin.
　The contact member 280 is supported by the supporting member 281 attached to the header 255. The contact member 280 is to be replaced according to the size of the steel material 10 is the processing object, it is detachable from the support member 281.
[0074]
　In the second cooling mechanism 241 and the third cooling mechanism 242, the contact for the member 280 is in contact with the steel 10, following the movement of the steel material 10 formed into a predetermined shape including a bend 11, the contact member 280 is moved. With the movement of the contact member 280, the header 255 of the second header 255 and the third cooling mechanism 241 of the cooling mechanism 242 is moved following the movement of the steel 10.
　Thus, even when performing complex bending against steel 10, the second coolant 55 ejected from the header 255 of the header 255 and the third cooling mechanism 242 of the second cooling mechanism 241 steel 10 it is possible to keep the collision position and the collision angle impinging on constant. Therefore, it is possible to inject the second cooling medium 55 against the peripheral surface including the outer bend 11 of the steel material 10 regardless of the shape of the steel material 10, to reduce the shrink unevenness in bending steel 10 it can.
[0075]
　The first cooling mechanism 240 and the second cooling mechanism 241 adjacent as shown in FIG. 9, the connecting member (connecting portion connecting the center of the first cooling mechanism 240 and the center of the second cooling mechanism 241 ) 290 is provided. One end portion of the connecting member 290 is fixed to the fixed shaft 291 of the first cooling mechanism 240, the coupling member 290 is rotatable about a fixed shaft 291. Further, the other end of the connecting member 290 is fixed to the fixed shaft 292 of the second cooling mechanism 241, the coupling member 290 is rotatable about a fixed shaft 292.
　As shown in FIG. 10 and FIG. 11, the connecting member 290 and the fixed shaft 291 and 292 is provided vertically above and vertically below the steel 10. As shown in FIG. 9, the connecting member 290, center distance L between the first cooling mechanism 240 and the second cooling mechanism 241 1 is maintained constant.
[0076]
　Similarly, the second cooling mechanism 241 and the third cooling mechanism 242, the coupling member 293 is provided for connecting the center of the second cooling mechanism 241 and the center of the third cooling mechanism 242. One end portion of the connecting member 293 is fixed to the fixed shaft 292 of the second cooling mechanism 241, the coupling member 293 is rotatable about a fixed shaft 292. Further, the other end of the connecting member 293 is fixed to the fixed shaft 294 of the third cooling mechanism 242, the coupling member 293 is rotatable about a fixed shaft 294.
　Incidentally, as shown in FIG. 11, the connecting member 293 and the fixed shaft 292 (, 294) are provided vertically above and vertically below the steel 10. As shown in FIG. 9, the connecting member 293, center distance L between the second cooling mechanism 241 third cooling mechanism 242 2 is maintained constant.
[0077]
　The first cooling mechanism 240 and the center-to-center distance L between the second cooling mechanism 241 1 center distance L between the or the second cooling mechanism 241 third cooling mechanism 242 2 when is not maintained constant since the collision position and the collision angle which the second coolant 55 strikes the steel 10 is not constant, depending on the site of the surface of the steel material 10, the second cooling medium 55 may not be properly ejected. Therefore, there is a possibility that unevenness baked steel material 10 occurs.
　On the other hand, according to this embodiment, the first cooling mechanism 240 and the second cooling mechanism 241 center distance L of 1 -center distance L and second cooling mechanism 241 and the third cooling mechanism 242 2 is by being kept constant, the collision position and the collision angle which the second coolant 55 strikes the steel 10 is maintained constant.
　Further, according to this embodiment, even in the case of forming a steel material 10 into complex shapes, it can be injected second cooling medium 55 in the circumferential surface of the outer steel 10.
[0078]
　For the reasons mentioned above, according to this embodiment, it is possible in the prior art cooling reliably even outside the bend 11 it is difficult to cool, it is possible to reduce the shrink unevenness in bending steel 10.
　Further, according to this embodiment, without requiring a complicated driving mechanism, it can be realized secondary cooling described above.
[0079]
　Second cooling medium 55 injected from the first cooling mechanism 240 after the steel 10 is cooled, the temperature is increased. Therefore, when the second cooling medium 55 injected from the second cooling mechanism 241 to cool the steel material 10, a second cooling medium injected from the first cooling mechanism 240 after the steel 10 is cooled 55 When there exists, it is impossible to effectively cool the steel 10.
　However, the contact member 280 provided in the second cooling mechanism 241 also has a function of draining the second coolant 55 ejected from the first cooling mechanism 240. That is, the second cooling medium 55 injected from the second cooling mechanism 241, without interfering with the second cooling medium 55 injected from the first cooling mechanism 240, it is possible to cool the steel material 10 . Therefore, according to this embodiment, it is possible by the second cooling medium 55 injected from the second cooling mechanism 241 for cooling the steel material 10 effectively.
[0080]
　Similarly, the contact member 280 of the third cooling mechanism 242 also has a function of draining the second coolant 55 ejected from the second cooling mechanism 241. That is, the third cooling mechanism 242 second coolant 55 ejected from without interfering with the second cooling medium 55 injected from the second cooling mechanism 241, it is possible to cool the steel material 10 . Therefore, according to this embodiment, it is possible by the second cooling medium 55 injected from the third cooling mechanism 242 for cooling the steel material 10 effectively.
　Therefore, according to this embodiment, it is possible to perform secondary cooling of the steel 10 by the second cooling device 223 more efficiently.
[0081]
　In the present embodiment, while keeping a constant, respectively the arrangement interval of each cooling mechanism adjacent, the arrangement of the cooling mechanism mechanism to follow the bent shape of the steel 10, as the moving mechanism. In the second cooling device 223 shown in FIGS. 9 to 11, the contact members 280 and the connecting member 290,293 constitute a moving mechanism described above. Moving mechanism constituted by the contact member 280 and the connecting member 290 to 293 are for moving the second cooling device 223 in response to movement of the steel 10, a passive movement mechanism.
[0082]
　(Second embodiment, the cooling method of steel)
　Next, the method of cooling steel 10 using the second cooling device 223 according to this embodiment will be described with reference to FIG. 12.
　Figure 12 is a schematic diagram showing a state of cooling the steel material 10 by using the second cooling device 223 according to the second embodiment comprises a contact member 280 and the connecting member 290 to 293.
　The cooling method of a steel material 10 according to the present embodiment, as shown in FIG. 12, the center of the first cooling mechanism 240 and the center of the second cooling mechanism 241 are connected by a connecting member 290, the second center of the cooling mechanism 241 and the center of the third cooling mechanism 242 is connected by a connecting member 293. Therefore, the injection interval in the feed direction at the time of injection with respect to a plurality of locations along the feeding direction of the second cooling medium 55 is kept constant, respectively.
[0083]
　Further, in the cooling method of steel 10 according to the present embodiment, as shown in FIG. 12, the contact member 280 provided in the second cooling mechanism 241 and the third cooling mechanism 242 is in contact with the steel 10. Thus, in the cooling method of steel 10 according to the present embodiment, the arrangement of the collision position of the second cooling medium 55 against the steel 10, into a predetermined shape of steel 10 obtained by contacting the outer shape of the steel material 10 It is made to follow-up (moving step).
　According to the cooling method of steel 10 according to the present embodiment, the injection interval in the feed direction at the time of injection with respect to a plurality of locations along the feeding direction of the second cooling medium 55 is kept constant, respectively, the arrangement of the collision position of the second cooling medium 55 against the steel 10 because it to follow the predetermined shape of the steel material 10, it is possible to reduce the baked unevenness of the steel material 10.
[0084]
　(Second embodiment Modification 1)
　Next, Modification 1 of the second embodiment will be described with reference to FIG. 13.
　Figure 13 is a schematic diagram showing a configuration of a second cooling device according to the first modification of the second embodiment.
　In the second cooling device 223 described above, is provided with the connecting member 290 to 293 and the contact member 280 as a moving mechanism, the structure of the moving mechanism is not limited thereto.
[0085]
　The second cooling mechanism as shown in FIG. 13 241, a drive unit 295 having a built-in, for example, a motor. Drive unit 295 is attached to the guide (guide portion) 296 which extends in the center of the concentric first cooling mechanism 240. Drive unit 295, in response to a predetermined shape of the plan given to the steel 10, it is moved along the header 255 of the second cooling mechanism 241 to guide 296. That is, the guide 296 defines a movement direction of the second cooling mechanism 241.
[0086]
　Similarly, the third cooling mechanism 242 has a drive unit 297 having a built-in, for example, a motor. Drive unit 297 is attached to the guide (guide portion) 298 which extends in the center of the concentric first cooling mechanism 240. Drive unit 297, in response to a predetermined shape of the plan given to the steel 10, it is moved along the header 255 of the third cooling mechanism 242 to guide 298. That is, the guide 298 defines a moving direction of the third cooling mechanism 242.
　According to this modification, it is moved along the guide 296 to the header 255 of the second cooling mechanism 241 driver 295 in response to a predetermined shape of the plan given to the steel 10, the drive unit 297 steel the header 255 of the third cooling mechanism 242 is moved along the guide 298 in accordance with a predetermined shape of the plan given to 10. Thus, the second coolant 55 ejected from the header 255 of the header 255 and the third cooling mechanism 242 of the second cooling mechanism 241, to keep the collision position and the collision angle impinging on the steel 10 constant can.
　For the reasons mentioned above, according to this modification, similarly to the second embodiment, since in the prior art can be cooled reliably also outside of the bend 11 it is difficult to cool, baked in bending steel 10 it is possible to reduce the non-uniformity.
[0087]
　In Modification 1 of the second embodiment, a driving unit 295, 297 and the guide 296 constitutes a moving mechanism. Moving mechanism constituted by the drive unit 295, 297 and the guide 296, 298 for moving the second cooling device 223 in accordance with the bent shape of the pre-programmed steel 10, an active movement mechanism.
　The guide 296, 298 is not limited to the rail-like guide may take a variety of configurations. For example the guide includes a second cooling mechanism 241 third cooling mechanism 242 and the may be guided suspended from vertically upward, respectively.
[0088]
　Further, in this modification, omitting the guide 296 and 298, in advance according to the bending shape of the programmed steel 10, center distance L 1 , L 2 control the driving unit 295, 297 so that each constant it may be. However, reliably center distance L 1 , L 2 in order to a constant, it is preferable that the guide 296, 298 is provided.
[0089]
　(Second embodiment, Modification 2)
　Next, modified example 2 of the second embodiment will be described with reference to FIG. 14.
　Figure 14 is a schematic diagram showing a configuration of a second cooling device 223 according to a second modification of the second embodiment.
　The second cooling device 223 shown in FIG. 14, as a moving mechanism includes a contact member 280 and the guide 296.
[0090]
　In this modification, the header 255 of the second cooling mechanism 241, the sliding member 295 'can be moved along the guide 296. Similarly, the header 255 of the third cooling mechanism 242, the sliding member 297 'can be moved along the guide 298.
　Further, in this modification, since the second cooling mechanism 241 and the third cooling mechanism 242 is provided with the contact member 280, the header 255 of the second header 255 and the third cooling mechanism 242 of the cooling mechanism 241 , to move to follow the movement of the steel 10.
[0091]
　Thus, even when performing complicated bending against steel 10, the second coolant 55 ejected from the header 255 of the second cooling mechanism 241 and the third cooling mechanism 242 collides with the steel 10 it can be kept in the collision position and the collision angle constant. Therefore, regardless of the bent shape of the steel material 10, it is possible to inject a bending 11 second cooling medium 55 against the outer peripheral surface of the steel material 10, it can reduce the shrink unevenness in bending is there.
　The movement mechanism of this modification, for moving the second cooling device 223 in response to movement of the steel 10, a passive movement mechanism.
[0092]
　(Third embodiment, the steel of the cooling device)
　Next, the cooling apparatus of steel 10 according to the third embodiment will be described with reference to FIGS. 15 to 17.
　Figure 15 is a schematic diagram illustrating a bending device provided with a cooling device for a steel material 10 according to the third embodiment. Figure 16 is a schematic diagram showing a configuration of a first draining mechanism 300. Figure 17 is a schematic diagram showing the state of cooling the steel material 10 by using a cooling apparatus of steel 10 according to the third embodiment.
　As shown in FIG. 15, of the second cooling device 323 according to this embodiment, the first cooling mechanism 40 at the most upstream position includes a first draining mechanism 300 for ejecting the draining water. The first draining mechanism 300 is provided between the first cooling mechanism 40 located at the most upstream of the first cooling device 22 and the second cooling device 23. The first draining mechanism 300, at a position upstream than the crash position of the second cooling medium 55 in which the steel 10 injected from the first cooling mechanism 40, toward the downstream side from the first cooling device 22 injection to draining the first cooling medium 35 that is.
[0093]
　The first draining mechanism 300 as shown in FIG. 16, provided by dividing the circumferential direction of the steel material 10, having a header 350-353 supplying draining water. Upper header 350 is located vertically above the steel 10, the lower header 351 is disposed vertically below the steel 10. Side header 352 and 353 are respectively arranged horizontally side of the steel material 10. Each header 350-353 can control the flow rate or amount of water draining water independently. The number of header 350-353 is not limited to the number of the present embodiment can be arbitrarily set.
[0094]
　Each header 350-353, spray nozzle 354, respectively are provided. The spray nozzle 354, for example a flat nozzle, full cone nozzle, etc. oval nozzles are used. The number of spray nozzles 354 provided in each header 350-353 is not limited to the number shown in FIG. 16, it can be arbitrarily set.
[0095]
　Spray nozzles 354 of each header 350-353 as shown in FIG. 17, draining water from the spray nozzle 354 upstream, i.e. are disposed in a direction that is injected into the first cooling device 22 side. Then, by draining water sprayed from the first draining mechanism 300, the first cooling medium 35 does not flow to the downstream side because it is drained. Thus, without being affected by the first cooling medium 35 injected from the first cooling device 22, it impinging second coolant 55 ejected from the first cooling mechanism 40 to the steel 10 it can. Therefore, it is possible to the second cooling device 323 by providing the first draining mechanism 300, engages with the secondary cooling of the steel 10 by the first cooling mechanism 40 more effectively.
[0096]
　The second cooling device 323 as shown in FIG. 15 may further include a second drainage mechanism 320 and the third draining mechanism 321 for ejecting the draining water. The second draining mechanism 320 is provided between the first cooling mechanism 40 and the second cooling mechanism 41. Third draining mechanism 321 is provided downstream of the second cooling mechanism 41.
　By the second cooling device 323 comprises a second draining mechanism 320, by draining water sprayed from the second draining mechanism 320, the second coolant 55 ejected from the first cooling mechanism 40 is drained It does not flow to the downstream side because it is. Thus, without being influenced by the second cooling medium 55 injected from the first cooling mechanism 40, it impinging second coolant 55 ejected from the second cooling mechanism 41 to the steel 10 it can. Therefore, it is possible to the second cooling device 323 by providing the second draining mechanism 320, engages with the secondary cooling of the steel 10 by the second cooling mechanism 41 more effectively.
[0097]
　By draining water sprayed from the third draining mechanism 321, since the second cooling medium 55 injected from the second cooling mechanism 41 is drained, the second cooling ejected from the second cooling mechanism 41 medium 55 can be prevented from scattering beyond the steel 10.
　The second drainage mechanism 320 and the third draining mechanism 321 has the same configuration as the first draining mechanism 300.
[0098]
　(Third embodiment, the cooling method of steel)
　Next, the method of cooling steel 10 according to the third embodiment will be described with reference to FIG. 17.
　(First draining step)
　cooling method of a steel material 10 according to this embodiment, the second cooling medium 55 and a steel material injected from the first cooling mechanism 40 located at the most upstream of the second cooling device 23 upstream position than the collision position of the 10, has a first water draining step of draining the first cooling medium 35 injected toward the downstream side.
　By cooling method of steel 10 according to the present embodiment has a first draining step, without being affected by the first cooling medium 35 injected from the first cooling device 22, a first cooling mechanism 40 a second cooling medium 55 injected from the can collide the steel 10. Therefore, it is possible to perform secondary cooling of the steel 10 by the first cooling mechanism 40 more effectively.
[0099]
　(Second draining step)
　cooling method of a steel material 10 according to this embodiment, at the downstream position than the collision position between the one and the steel 10 of the second cooling medium 55, a second cooling toward the downstream side medium 55 may have further a plurality of second draining step of draining the.
　By cooling method of steel 10 according to the present embodiment has a plurality of second draining process, without being affected by the second cooling medium 55 injected from the first cooling mechanism 40, the second cooling mechanism a second cooling medium 55 injected from the 41 can collide in the steel 10. Further, since the cooling method of steel 10 according to the present embodiment has a plurality of second draining step, since the second coolant 55 ejected from the second cooling mechanism 41 can be drained, the second of the cooling medium 55 can be prevented from scattering beyond the steel 10.
　Therefore, by cooling method of steel 10 according to the present embodiment has a second water draining step, it is possible to perform secondary cooling of the steel 10 by the second cooling mechanism 41 more effectively.
[0100]
　(Fourth embodiment, the steel of the cooling device)
　Next, the cooling apparatus of steel 10 according to the fourth embodiment will be described with reference to FIG. 18.
　Figure 18 is a schematic diagram showing a schematic configuration of a bending apparatus of a steel material 10 having a cooling device for a steel material 10 according to the fourth embodiment.
[0101]
　In the second cooling device 423 according to this embodiment, the second coolant 55 ejected from the first cooling mechanism 40 and the second cooling mechanism 41 is controlled by a control unit 400 shown in FIG. 18. Control unit 400 is, for example, a computer, a control unit 400, a program that controls the flow rate and water flow rate of the second cooling medium 55 is stored.
　Control unit 400, the second flow rate 2 ~ 30 m / sec of the cooling medium 55, water flow rate is 5 ~ 100 m 3 / m 2 so that / min, and controls the second cooling medium 55. The cooling by the second cooling medium 55, the steel 10 is cooled to the martensite transformation than finishing temperature Mf or about room temperature, for example. Specifically, the steel 10 is cooled to, for example, room temperature ~ 300 ° C..
　In the present embodiment, water density (m 3 / m 2 / min), the unit area of the cooling material surface which is a region where the cooling water collides, with the amount of water per unit time.
[0102]
　Although the above control unit 400 has been described for the case provided in the second cooling device 423 is provided with a control unit 400 to the first cooling device 22, first the control unit 400 is ejected from the first cooling device 22 of the cooling medium 35 may be controlled. When the control unit 400 controls the first cooling medium 35, the control unit 400, the flow rate of the first cooling medium 35 is 2 ~ 8m / sec, water flow rate is 20 ~ 80 m 3 / m 2 and / min and it controls the first cooling medium 35 such that.
　By control unit 400 controls the second cooling medium 55 as described above, the second cooling medium 55 injected from the first cooling mechanism 40, ejected from the first cooling device 22 1 it can be drained of coolant 35.
[0103]
　For cooling the steel material 10 efficiently, i.e. to increase the heat transfer to the steel 10 should be generally less the thickness of the temperature boundary layer. In the present embodiment, since the second cooling medium 55 injected from the first cooling mechanism 40 performs the draining of the first cooling medium 35, the first cooling medium 35 that the temperature increase flow downstream it is possible to prevent. This can prevent the development of the thermal boundary layer of the second cooling medium 55 injected from the first cooling mechanism 40. Therefore, it is possible to effectively cool the steel 10.
[0104]
　The control unit 400 by controlling the second cooling medium 55 as described above, the second coolant 55 ejected from the second cooling mechanism 41 has been ejected from the first cooling mechanism 40 it can be drained second cooling medium 55. Thus, for the same reason as described above, it is possible to prevent the development of the thermal boundary layer of the second cooling medium 55 injected from the second cooling mechanism 41, is possible to cool the steel material 10 more effectively it can.
[0105]
　To cool the stable and efficient steel 10 in the nucleate boiling region in the secondary cooling is required to ensure the water density of the second cooling medium 55. From the viewpoint of securing the water density, the lower limit of the flow rate of the second cooling medium 55 and 2m / sec.
[0106]
　On the other hand, the upper limit of the flow rate of the second cooling medium 55 performs draining of the first cooling medium 35 is not particularly limited in terms of adequately performing the secondary cooling of the steel 10. However, from the viewpoint of maintenance and economy of the second cooling device 23, the amount of water as small as possible is preferable in the second cooling medium 55, the flow rate of the second cooling medium 55 as much as possible slow preferred. Therefore, the upper limit of the flow rate of the second cooling medium 55 and 30 m / sec.
　In the present embodiment, the flow rate of the second cooling medium 55 refers to the velocity at the spray nozzle 54 and 64 outlets.
[0107]
　(Fourth embodiment, the cooling method of steel)
　Next, the method of cooling steel 10 according to the fourth embodiment will be described with reference to FIG. 19.
　Figure 19 is a schematic diagram showing the state of using a cooling apparatus of steel 10 according to the fourth embodiment to cool the upper surface of the steel 10.
[0108]
　As shown in FIG. 19, the first cooling medium 35 injected from the first cooling device 22, the impact angle phi 1 collides with the steel 10. First cooling medium 35, after the steel material 10 and the primary cooling flows toward the downstream side.
　Second cooling medium 55 injected from the spray nozzles 54 of the upper header 50 of the first cooling mechanism 40, the impact angle theta 4 collides with the steel 10. Incidentally, as shown in FIG. 19, the control unit 400 is provided in the first cooling mechanism 40 and the second cooling mechanism 41, the flow rate of the second cooling medium 55 is 2 ~ 30 m / sec, water density There ~ 100 m 5 3 / m 2 is controlled so that / min.
[0109]
　Of the second cooling medium 55 injected from the spray nozzles 54 to the steel 10, a portion of the second cooling medium 55a flows in the upstream side performs the draining of the first cooling medium 35, the remaining second the cooling medium 55b flows to the downstream side, performing a secondary cooling of the steel 10. According to this cooling method, since the first cooling medium 35 is drained, the second cooling medium 55b to perform secondary cooling is not affected by the first cooling medium 35, second steel 10 primary cooling can be appropriately performed.
　The second cooling medium 55a is used for draining the first cooling medium 35, it is exhausted from the side of the steel material 10 together with the first cooling medium 35 flows to the upstream side (the heating device 21 side) it is not.
[0110]
　Second cooling medium 55 injected from the spray nozzles 64 of the upper header 60 of the second cooling mechanism 41, the impact angle theta 5 strikes the steel 10. Of the second cooling medium 55 injected from the spray nozzles 64 to the steel 10, a portion of the second cooling medium 55a is flowing upstream, draining of the second cooling medium 55b ejected from the spray nozzles 54 was carried out, the remaining second coolant 55b flows to the downstream side, performing a secondary cooling of the steel 10. According to this cooling method, since the second cooling medium 55b whose temperature rise can be prevented from flowing to the downstream side, it is possible to perform secondary cooling of the steel 10 of the second cooling medium 55 efficiently .
[0111]
　In the present embodiment, since the flow rate of the second coolant 55 is controlled to 2 ~ 30 m / sec, a part of the second cooling medium 55a of the second cooling medium 55 injected into the steel 10 perform draining of the first cooling medium 35 flows to the upstream side, the secondary cooling of the steel material 10 is performed by the remaining second coolant 55b.
　Therefore, it is possible to second cooling medium 55b without being affected by the first cooling medium 35 to cool the steel material 10, the outer peripheral surface of the second cooling medium 55b bending steel 10 11 to it is possible to injection Te. Thus, it is possible to suppress the baked unevenness of the steel material 10, it can be provided with suitable bending a steel material 10. Moreover, since the second cooling medium 55 is provided with a secondary cooling function of draining function and a steel material 10 of the first cooling medium 35, it is not necessary to provide the draining mechanism in the first cooling medium 35 separately, economics It has excellent.
[0112]
　Case of cooling the lower surface of the steel material 10, a similar cooling method is used. That is, in the cooling of the lower surface of the steel material 10, a second cooling medium which is sprayed from the spray nozzles 64 of the lower header 61 of the spray nozzle 54 and the second cooling mechanism 41 of the lower header 51 of the first cooling mechanism 40 55 the flow rate by a 2 ~ 30 m / sec, the lower surface of the cooling of the steel 10 of the second cooling medium 55 can be properly carried out. Incidentally, the flow rate of the second coolant 55 ejected from the spray nozzle 64 side header 62 and 63 of the spray nozzle 54 and the second cooling mechanism 41 side header 52 and 53 of the first cooling mechanism 40 , like the second cooling medium 55 injected from the upper header 50, 60 and lower header 51 and 61 and is preferably in the 2 ~ 30 m / sec.
[0113]
　Depending on the cooling conditions of the steel material 10, not only the flow rate of the second cooling medium 55, the collision angle is also controlled by the control unit 400 of the water density and the second cooling medium 55 and the steel member 10 of the second cooling medium 55 it may be. By the control unit 400 can control the impact angle of the water density and the second cooling medium 55 and the steel member 10 of the second cooling medium 55, in the case where a complicated bending process against the steel 10 also, without generating burnt unevenness, it is possible to cool the steel material 10.
[0114]
　(Fourth embodiment, Modification 1)
　Next, a modification 1 of the fourth embodiment will be described with reference to FIGS. 20 to 22.
　Figure 20 is a schematic diagram showing the structure of a bending apparatus 1 steel 10 provided with a cooling device for a steel material 10 according to a first modification of the fourth embodiment. Figure 21 is a schematic diagram showing a configuration of a first cooling mechanism 40 and the moving mechanism 470 according to a first modification of the fourth embodiment. Figure 22 is a schematic diagram showing the state of cooling the steel material 200 using the cooling method of a conventional steel 200.
　The second cooling device 423 according to this modification further comprises a moving mechanism 470 for moving the spray nozzle 54 and 64 as shown in FIGS. 20 and 21. Moving mechanism 470 includes a support member 471 for supporting the header 50 to 53, 60 to 63, the support member 471 (header 50 ~ 53, 60 ~ 63 and spray nozzle 54, 64) a drive arm 472 which moves the drive arm and a driving unit 495 for driving the 472. The configuration of the moving mechanism 470 is not limited to this modification, if it is possible to move the spray nozzles 54 and 64 may take any configuration.
　Although not shown, the moving mechanism 470 provided in the second cooling mechanism 41 has the same configuration as the moving mechanism 470 provided in the first cooling mechanism 40.
[0115]
　Here, for example, when using a cooling method of a conventional steel 200 described in Patent Document 1, that is, when the steel 200 after heat processing as shown in FIG. 22 is cooled by the cooling device 210, ejected from the cooling device 210 the cooling medium is, for straight in the feed direction of the steel material 200 (X-axis direction in FIG. 22), the peripheral surface 201 (the region surrounded by a dotted line in FIG. 22) of the outer bend of steel 200 (convex side) not collide with. Therefore, not performed outside of the circumferential surface 201 cooling is sufficiently bending, unevenness baked steel material 200 occurs. In particular, when the feed speed when and steel 200 for bending complex shapes is high, baked unevenness is likely to occur in the steel 200.
[0116]
　On the other hand, the moving mechanism 470 of the present embodiment is bent to follow the movement of the steel 10 formed in a predetermined shape including the 11 bending by apparatus 24, spray nozzles 54 provided in the header 50 to 53, 60 to 63 , it can be moved 64. Therefore, even for steel 10 being processed into complex shapes, it can be injected bend 11 second cooling medium 55 against the outer peripheral surface of the steel 10. As a result, it is possible to adequately cool the circumferential surface of the outer bend 11, it is possible to suppress the baked unevenness of the steel material 10.
[0117]
　Furthermore, since it is possible to move the spray nozzle 54 and 64 by the moving mechanism 470 can be a second coolant 55 ejected from the spray nozzles 54 and 64 to adjust the impact angle impinging on the steel 10.
　By adjusting the impact angle of the second cooling medium 55 and a steel 10 below 45 degrees, the second cooling medium 55 that has collided with the steel 10 is returned to the upper header 50, 60 or the lower header 51 and 61 side it is possible to prevent. Further, by adjusting the impact angle of the second cooling medium 55 and a steel 10, the momentum of the second cooling medium 55 about the feed direction of the steel material 10, to the feed direction of the steel material 10 of the first cooling medium 35 it can be made larger than the momentum.
　Therefore, by the second cooling device 423 is provided with a moving mechanism 470, it is possible to perform secondary cooling of the steel material 10 more effectively.
[0118]
　Further, in the embodiment shown in FIG. 3, in order to cope with the case where the steel material 10 is formed in various shapes, to increase the width of the upper header 50 and lower header 51, respectively to the upper header 50 and lower header 51 It is provided with a plurality of spray nozzles 54.
　On the other hand, in this modification, it is possible to reduce as well as reduce the width of the upper header 50 and lower header 51 as shown in FIG. 21, the number of spray nozzles 54. The number of spray nozzles 54 is not limited to the number shown in this embodiment, it can be arbitrarily set. For example a spray nozzle 54 provided on the side headers 52, 53 and side header 52 and 53 may be omitted.
　In FIG. 21, it is omitted controller 400.
[0119]
　Further, by the second cooling device 423 is provided with a moving mechanism 470, since the spray nozzles 54 provided in the header 50-53 can be made to follow the movement of the steel 10, the second injected from the spray nozzles 54 the cooling medium 55 can collide reliably the steel 10. Therefore, it is possible to reduce the amount of water in the second cooling medium 55 required to cool the steel material 10 to a predetermined temperature. Thus, it is possible to improve the maintenance and economy of the second cooling device 423.
[0120]
　(Fourth embodiment, Modification 2)
　Next, a modification 2 of the fourth embodiment will be described with reference to FIG. 23.
　Figure 23 is a schematic diagram showing the structure of a bending apparatus 1 steel 10 with a second cooling device 423 according to the second modification of the fourth embodiment.
　As shown in FIG. 23, the first cooling mechanism 40 and the second cooling mechanism 41 of this embodiment, in addition to the control unit 400, further pulsation imparting mechanism 480 for imparting pulsating second cooling medium 55 provided. Configuration of the pulsation imparting mechanism 480 may be employed a known structure, not limited to a particular configuration.
[0121]
　To perform secondary cooling of the steel material 10 in the nucleate boiling region, generally latent since and steel 10 second cooling medium 55 on a steel material 10 is agitated in the second cooling medium 55 is properly applied it is necessary. The second cooling medium 55 to be injected into the steel 10, when the pulsation is applied by pulsation applying mechanism 480, the second cooling medium 55 is stirred, steel 10 according to the second cooling medium 55 can be performed more reliably nucleate boiling region of secondary cooling. Therefore, it is possible to perform secondary cooling of the steel material 10 more effectively.
[0122]
　(Fifth embodiment, the steel of the cooling device)
　will be described with reference to FIGS. 24 and 25 for the cooling apparatus of steel 10 according to the fifth embodiment.
　Figure 24 is a schematic diagram bend showing the configuration of a processing apparatus 1 comprises a cooling apparatus of steel 10 according to the fifth embodiment. Figure 25 is a schematic diagram showing a configuration of a first cooling mechanism 540 according to the fifth embodiment.
[0123]
　As shown in FIG. 24, the bending apparatus 1 steel 10 according to this embodiment, in place of the second cooling device 23, a second cooling device 523.
　As shown in FIG. 25, the spray nozzles 554 of each header 550-553 of the first cooling mechanism 540 according to this embodiment, the upstream side of the second cooling medium 55 is feed direction ejected from the spray nozzle 554 They are arranged in a direction to be injected.
　Incidentally, the spray nozzle 554 of the upper header 550 and the lower header 551, a collision angle θ second coolant 55 ejected from the spray nozzle 554 collides against the steel 10 6 being oriented so is below 60 degrees It is preferred. Impact angle theta 6 a by 60 degrees or less, can be suppressed to return to the second cooling medium 55 upper header 550 or the lower header 551 side to reverse, which collides with the steel 10.
[0124]
　Spray nozzles 554 of each header 550-553, the second cooling medium 55 until reaching the steel 10, the second cooling medium 55 to each other to be injected from the spray nozzles 554 to be sprayed from the spray nozzle 554 it is preferably disposed at a position that does not intersect with each other.
　Furthermore, even when performing bending of a complex shape with respect to the steel material 10, as can be the second cooling medium 55 to properly cool the steel 10, the spray of the upper header 550 and lower header 551 injection angle θ of the second cooling medium 55 injected from the nozzle 54 7 and the injection angle θ of the second cooling medium 55 is injected from the spray nozzle 54 side header 552 and 553 8 and, above to the extent that between the second cooling medium 55 does not intersect with each other so that preferably a largest possible angle.
　However, considering the maintainability and economy of the second cooling device 523, the injection angle theta 7 , theta 8 about 30 to 90 degrees respectively are preferred. Furthermore, when the moving mechanism 570 is provided in the second cooling device 523 as described later, the injection angle theta 7 , theta 8 about 30 to 50 degrees respectively are preferred. However, when the cooling surface of the steel material 10 is narrow is, theta 7 , theta 8 is may be 10 to 30 degrees.
[0125]
　Although described configuration of the first cooling mechanism 540 with reference to FIG. 25, has a similar configuration the second cooling mechanism 541.
　In the first cooling mechanism 540 and the second cooling mechanism 541, the second cooling medium 55 to be injected from the spray nozzles 554, 564 may be controlled by the control unit 500 shown in FIG. 27.
[0126]
　If the flow rate of the second coolant 55 is controlled by the control unit 500 is preferably set to 2 ~ 15 m / sec.
　The lower limit of the flow rate of the second coolant 55 ejected from the second cooling device 523 of this embodiment, for the same reason as described above, the 2m / sec. On the other hand, the flow rate of the second cooling medium 55 is greater than 15 m / sec, the second cooling medium 55 in some cases may flow to the heating device 21. In this embodiment, the upper limit of the flow rate of the second cooling medium 55 and 15 m / sec.
[0127]
　The second cooling device 523 according to this embodiment, as shown in FIGS. 28 and 29, may have a moving mechanism 570. Although Figure 29 represents a moving mechanism 570 provided in the first cooling mechanism 540, (not shown) having the same configuration moving mechanism 570 provided in the second cooling mechanism 541.
　The second cooling device 523 according to this embodiment, as shown in FIG. 30, may have a pulsation applying mechanism 580.
　As the moving mechanism 570 and the pulsation applying mechanism 580 can be formed of the same configuration as the fourth embodiment.
[0128]
　(Fifth embodiment, the cooling method of steel)
　Next, the method of cooling steel 10 according to the fifth embodiment will be described with reference to FIG. 26.
　Figure 26 uses the cooling device of steel 10 according to the fifth embodiment is a schematic diagram showing how to cool the upper surface of the steel 10.
[0129]
　First cooling medium 35 injected from the first cooling device 22, the impact angle phi 1 collides with the steel 10. First cooling medium 35 after the steel 10 to the primary cooling, flow downstream.
[0130]
　Second cooling medium 55 from the spray nozzle 554 of the upper header 550 of the first cooling mechanism 540, the impact angle theta 6 strikes the steel 10. Of the second cooling medium 55 from the spray nozzle 554 in steel 10, a portion of the second cooling medium 55a is flowed on the upstream side performs the draining of the first cooling medium 35. According to this cooling method, since the first cooling medium 35 is drained when performing the secondary cooling, the second coolant 55b ejected from the spray nozzle 554 the effect of the first cooling medium 35 without being, it is possible to perform secondary cooling of the steel 10. The second cooling medium 55a after used for draining the first cooling medium 35, is exhausted from the side of the steel material 10 together with the first cooling medium 35 flows into the heating device 21 of the upstream-side Absent.
[0131]
　Second cooling medium 55 from the spray nozzle 564 of the upper header 560 of the second cooling mechanism 541, the impact angle theta 11 strikes the steel 10. Of the second cooling medium 55 from the spray nozzle 564 in steel 10, a portion of the second cooling medium 55a is flowed on the upstream side performs the draining of the second coolant 55b. According to this cooling method, since the second coolant 55b ejected from the spray nozzle 554 in performing the secondary cooling is drained, the second cooling medium 55b is a spray nozzle which is injected from the spray nozzle 564 without being affected by the second cooling medium 55b injected from 554, it is possible to perform secondary cooling of the steel 10.
[0132]
　According to the cooling method of steel 10 of the present embodiment, for the reasons described above, it is possible to reduce the thickness of the temperature boundary layer of the second cooling medium 55, it is possible to cool the steel material 10 efficiently .
[0133]
　According to this embodiment, since the second cooling medium 55 is injected toward the upstream side in the feeding direction, the second cooling medium 55a ejected from the spray nozzle 554 in steel 10 flows upstream the performing draining the first cooling medium 35. The second cooling medium 55a may flow to the upstream side performs the draining of the second cooling medium 55b ejected from the spray nozzle 554 that is sprayed from the spray nozzle 564 in steel 10.
　Accordingly, without being affected by the second cooling medium 55b injected from the first cooling medium 35 and the spray nozzles 554 and the temperature rise, the circumferential surface of the convex side of the bend 11 of the steel 10 to the second cooling medium 55 it is possible to injection, the bending can be suppressed baked unevenness of the steel material 10 during processing, a result, it is possible to perform appropriate bending a steel material 10.
　Further, since the second cooling medium 55 is both a secondary cooling function of draining function and a steel material 10 of the first cooling medium 35, it is possible to efficiently cool the steel 10.
[0134]
　In this embodiment, the momentum of the second cooling medium 55 about the feed direction of the steel material 10 may be slightly larger than the momentum of the first cooling medium 35 about the feed direction of the steel material 10. However, the momentum of the second cooling medium 55 is at least twice the movement amount of the first cooling medium 35, the second cooling medium 55a is a heating device 21 of the upstream-side penetrate the first coolant 35 there is a possibility that flows through the momentum of the second cooling medium 55 is preferably 1 to 1.5 times the momentum of the first cooling medium 35.
[0135]
　In the above has been described for cooling the upper surface of the steel material 10 with reference to FIG. 26, the same cooling method may cool the lower surface of the steel material 10 is used. That is, in the cooling of the lower surface of the steel material 10, the second coolant 55 ejected from the spray nozzles 554, 564 of the lower header 551,561 as described above is injected to the upstream side of the feeding direction, and the second by controlling the flow rate of the cooling medium 55 to 2 ~ 15 m / sec, the lower surface of the cooling of the steel 10 of the second cooling medium 55 can be properly carried out.
　Incidentally, the flow rate of the second coolant 55 ejected from the spray nozzles 554, 564 of the side headers 552,553,562,563, like the upper header 550, 560, and lower headers 551,561, 2 ~ 15m preferably limited to / sec.
[0136]
　The present invention is not limited to the embodiment described above, changes of deviant not the scope of the configuration the gist of the present invention, combination etc. are also included. Further, it is needless to say that can be used in combination with each configuration shown in the embodiments as appropriate.
Example
[0137]
　Hereinafter, examples and comparative examples, the present invention will be described more specifically. The present invention is not limited to the following examples.
Example 1
[0138]
　In the case of using a cooling apparatus of steel material according to the first embodiment, the surface temperature of the steel material for the feed position of the steel material, will be described with reference to FIGS. 31 and 32.
　Figure 31 is a graph showing the results of Example 1-1, FIG. 32 is a graph showing the results of Comparative Example 1-1.
　In Examples 1-1 and Comparative Examples 1-1, a first cooling device, with a first cooling device shown in FIG. In Example 1-1, the second cooling device, and using a second cooling mechanism shown in a first cooling mechanism and 5 shown in FIGS. On the other hand, in Comparative Example 1-1, using the second cooling device described in Patent Document 2.
[0139]
　In Example 1-1, the following conditions were used.
　Water of the first cooling medium is 110L / min, the flow rate was 4m / sec.
　Water in the second cooling medium from the upper header of the first cooling mechanism 50L / min, the flow rate was 12m / sec, the amount of water in the second cooling medium from the lower header 50L / min, the flow rate 12m / a sec, water in the second cooling medium, respectively 18L / min from the side headers, the flow rate was 10 m / sec. The second quantity of cooling medium is 75L / min from the top header of the second cooling mechanism, the flow rate is 12m / sec, the amount of water in the second cooling medium from the lower header 75L / min, the flow rate 12m / a sec, respectively water of the second cooling medium 20L / min from the side headers, the flow rate is 10 m / sec. The first cooling medium is plume, water density is 40 m 3 / m 2 was / min.
[0140]
　The secondary cooling, using a flat spray nozzle as a nozzle header. , The spread angle in the upper header and a lower header, the spread angle (injection accuracy) of 50 degrees of the second cooling medium is injected from the nozzle, water density is 80 m 3 / m 2 was / min, and. The side header in order to be injected into the flat side, a spray divergence angle of above 10 degrees, water density is 40 m 3 / m 2 was / min.
　Momentum of the second cooling medium were both more than 1.5 times of the first cooling medium.
[0141]
　In Comparative Example 1-1, the following conditions were used. As described above, the first cooling device used in Comparative Example 1-1, the same as the first cooling device used in Example 1-1, the first cooling in Comparative Examples 1-1 conditions relating to media also using the same conditions as for the first cooling medium in example 1-1.
　Water in the second cooling medium is 200L / min, the flow rate of the second cooling medium is 4m / sec, water density of the second cooling medium is 12m 3 / m 2 was / min. Moreover, the injection mode of the second cooling medium was plume.
　Momentum of the second cooling medium about the feed direction of the steel material was 1 times the momentum of the first cooling medium about the feed direction of the steel material.
[0142]
　Based on the above conditions it was subjected to bending against the steel. Note that in FIG. 31 and FIG. 32, the abscissa indicates position of the feed direction of the steel material (the feed position) and the vertical axis represents the surface temperature of the steel material. Further, in FIG. 31 and FIG. 32, solid line shows the temperature change in one point located on the bend inner side of the steel material, the dotted line shows the temperature change in one point located on the bend outer steel.
　When comparing FIGS. 31 and 32, in Comparative Example 1-1, while the temperature difference is caused between the inside and the outside of the bend, in Example 1-1, the inner bent portion and the outer temperature difference is hardly occurred in the.
　Therefore, according to the present invention, it is possible to uniformly cool the inside and outside of the bent portion of the steel material was found to be suppressed baked unevenness is a problem of the prior art.
Example 2
[0143]
　Residual stresses in the case of using a cooling apparatus of steel material according to the first embodiment will be described with reference to FIG. 33.
　Figure 33 is Example 2-1 is a graph showing the results of Example 2-2 and Comparative Example 2-1.
　In Examples 2-1, the first cooling device used in Examples 2-2 and Comparative Examples 2-1, the same as the first cooling apparatus used in Examples 1-1 and Comparative Examples 1-1 it is. The second cooling device used in Examples 2-1 and Example 2-2 is the same as the second cooling device used in Example 1-1. Further, a second cooling device used in Comparative Example 2-1 is the same as the second cooling apparatus used in Comparative Example 1-1.
[0144]
　Conditions of Example 2-1, except that the amount of water in the second cooling medium to be injected from the side header of the second cooling mechanism and 18L / min, the use of the same conditions as in Example 1-1 It had.
[0145]
　Conditions of Example 2-2 is as follows.
　The first quantity of cooling medium is 110L / min, the flow rate of the first cooling medium is 3m / sec, water density of the first cooling medium is 40 m 3 / m 2 and / min, the injection mode of the first cooling medium It was the plume.
　The second cooling medium is injected from the upper header and the lower header of the first cooling mechanism, the amount of water 60L / min, the flow rate was set to 14m / sec. The second cooling medium to be injected from the side header of the first cooling mechanism, the amount of water 23L / min, the flow rate was set to 12m / sec.
[0146]
　The second cooling medium is injected from the upper header and the lower header of the second cooling mechanism, the amount of water 90L / min, the flow rate was set to 14m / sec. The second cooling medium to be injected from the side header of the second cooling mechanism, the amount of water 23L / min, the flow rate was set to 12m / sec.
　The nozzle headers of the first cooling mechanism and a second cooling mechanism, using the oblong blow spray nozzles.
[0147]
　The second cooling medium is injected from the upper header and the lower header of the first cooling mechanism and a second cooling mechanism, spread angle (spray angle) of 50 degrees, the water flow rate 25 m 3 / m 2 and / min did.
　The second cooling medium to be injected from the side header of the first cooling mechanism and a second cooling mechanism, spread angle (spray angle) 10 degrees, the water flow rate 28 m 3 / m 2 was / min.
　Momentum of the second cooling medium about the feed direction of the steel material was 1.5 times the momentum of the first cooling medium about the feed direction of the steel material.
[0148]
　In Comparative Example 2-1, using the same conditions as in Comparative Example 1-1.
[0149]
　It was bent with respect to the steel material under the conditions described above. The results are shown in Figure 33. In Figure 33, the vertical axis represents the stress remaining in the steel after cooling, indicating a ratio of a case of the 1 residual stress of Comparative Example 2-1. Also, the positive residual stresses are tensile stress, negative residual stress is compressive stress.
[0150]
　Referring to FIG. 33, in Comparative Example 2-1, while the tensile stress steel material remaining, in Examples 2-1 and 2-2, the compression stress remaining in the steel. Therefore, according to the present invention, it was found to improve the strength of the steel material.
Example 3
[0151]
　In the case of using a cooling apparatus of steel according to the fifth embodiment, the surface temperature of the steel material for the feed position of the steel material, will be described with reference to FIG. 34.
　Figure 34 is a graph showing the results of Example 3-1.
　In Example 3-1, using the second cooling device according to the first cooling device and the fifth embodiment shown in FIG.
[0152]
　In Example 3-1, except for using the second cooling device shown in FIG. 25 as the second cooling device, using the same conditions as in Example 1-1 were subjected to bending with respect to steel.
　The horizontal axis of FIG. 34 shows the position of the feed direction of the steel material (the feed position) and the vertical axis represents the surface temperature of the steel material. Further, in FIG. 34, solid line shows the temperature change in one point located on the bend inner side of the steel material, the dotted line shows the temperature change in one point located on the bend outer steel.
[0153]
　As shown in FIG. 34, in Example 3-1, no temperature difference is hardly generated inside the bent portion and an outer temperature difference such as in Comparative Example 1-1 did not occur. Therefore, according to the present invention, it is possible to uniformly cool the inside and outside of the bent portion of the steel material was found to be suppressed baked unevenness is a problem of the prior art.
Industrial Applicability
[0154]
　According to the above embodiments, it is possible to provide a cooling apparatus and cooling method capable steel to reduce the baked unevenness of the steel material.
DESCRIPTION OF SYMBOLS
[0155]
1 bending apparatus
10, 200 steel
11 bent (bent
portion) 20 feeder
21 the heating device
22 the first cooling device (primary cooling
device) 23,223,323,423,523 second cooling device (secondary cooling device )
24 bending apparatus
25 clamp
26 drives arm
35 first coolant
40,240,540 first cooling mechanism
41,241,541 second cooling mechanism
55 second cooling medium
280, 281 contact member (contact portion)
290,293 connecting member (connecting
portion) 295,297,495 driver
296 guides (guide
portion) 300 first dewatering mechanism
320 second dewatering mechanism
321 third draining mechanism
400, 500 control unit
480,580 pulsation applying mechanism

The scope of the claims
[Claim 1]
　Bending by moving the one end portion in a two-dimensional or three-dimensional direction while heating the longitudinal portion of the steel material while feeding the steel while holding one end portion of the elongated steel material in the longitudinal direction after forming into a predetermined shape, including, a cooling device for cooling the heated portion including the bend,
　the first cooling device and for injecting the first cooling medium with respect to the heated portion;
　of the steel than the first cooling device when viewed in the feed direction is provided on the downstream side, the second cooling device for injecting a second cooling medium with respect to the heated portion;
comprises a,
　the second 2 of the cooling device, the a plurality arranged along the feeding direction and flow rate of the independently the second cooling medium to each other is controllable
, characterized in that, the steel material of the cooling device.
[Claim 2]
　Wherein while maintaining the arrangement distance between each of the second cooling apparatus to a constant, respectively adjacent to each other, further comprising a moving mechanism to follow the arrangement of the second cooling device to the predetermined shape
, characterized in that, according cooling device of steel according to claim 1.
[Claim 3]
　The moving mechanism,
　; wherein arrangement the contact portion and to follow the predetermined shape of the steel of each of the second cooling device by contact with the outer shape of the steel
　each second cooling device adjacent to each other a connecting portion connecting;
a passive movement mechanism having
, characterized in that the cooling device of steel according to claim 2.
[Claim 4]
　The moving mechanism,
　a contact portion to follow the arrangement of the respective second cooling device by contact with the outer shape of the steel to the predetermined shape of the steel;
　the movement direction of the respective second cooling device and defining guide portion;
a passive movement mechanism having
, characterized in that the cooling device of steel according to claim 2.
[Claim 5]
　The moving mechanism, in response to the predetermined shape of the plan given to the steel, is an active movement mechanism having a drive unit for moving the respective second cooling device
, characterized in that, claims cooling device of steel according to 2.
[Claim 6]
　The second cooling device,
　and with a plurality arranged along the circumferential direction of the steel material, each comprising a cooling mechanism for injecting the second cooling medium, independently of one another flow controllably
and wherein the to, the cooling device of steel according to any one of claims 1 to 5.
[Claim 7]
　Wherein each cooling mechanism, wherein between the respective cooling mechanism up to the steel, the second cooling medium between ejected from the respective cooling mechanism is disposed so as not to cross each other
and wherein the to, the cooling device of steel according to claim 6.
[8.]
　When said each second cooling device viewed along the feed direction, the direction of the second cooling device in the downstream side of the second cooling device in a relatively upstream side, the steel There inside diameter of the space for inserting a large
cooling device steel according to any one of claims 1 to 7, characterized in that.
[Claim 9]
　The upstream position than the collision position with the injected second cooling medium than in the most upstream position and the steel material of the second cooling device, the first cooling medium toward the downstream side having further a first draining mechanism for draining
, characterized in that the cooling device of steel according to any one of claims 1-8.
[Claim 10]
　The downstream position than the collision position between the second cooling medium is injected from one and the steel out of the second cooling device, a second for draining said second cooling medium toward the downstream side further plurality have a drainage mechanism
, characterized in that the cooling device of steel according to any one of claims 1 to 9.
[Claim 11]
　At least one of the respective second cooling device comprises a pulsation imparting mechanism that imparts pulsation to the second cooling medium
, wherein the steel product as claimed in any one of claims 1 to 10, of the cooling device.
[Claim 12]
　At least, greater than the momentum of the first cooling medium momentum of those injected at the most upstream position is injected to adjacent positions of the most upstream position of the second cooling medium
, characterized in that, according cooling device of steel according to any one of claims 1 to 11.
[Claim 13]
　Said first cooling medium, be a columnar jets;
　the second cooling medium, flat-shaped jet, full cone shaped jets, and oval-shaped jet, which is either
characterized by, cooling device of steel according to any one of claims 1 to 12.
[Claim 14]
　Bending by moving the one end portion in a two-dimensional or three-dimensional direction while heating the longitudinal portion of the steel material while feeding the steel while holding one end portion of the elongated steel material in the longitudinal direction after forming into a predetermined shape, including, a cooling method for cooling the heated portion including the bend,
　first cooling step and for injecting the first cooling medium to the heated portion;
　said feeding direction wherein and the first downstream side of the ejection position of the cooling medium when viewed along the second cooling step of injecting a second cooling medium with respect to the heated portion;
have,
　the in the second cooling step, the steel, the injecting the second cooling medium while independently controlling the flow rate to each other with respect to a plurality of locations along the feed direction
, characterized in that, the steel material cooling method.
[Claim 15]
　The second cooling step, while maintaining the injection interval in the feeding direction at the time of injecting the second cooling medium with respect to a plurality of locations along said feeding direction at a constant, respectively, said second to said steel the arrangement of the collision position of the cooling medium comprising a moving step to follow the predetermined shape of the steel
, wherein the steel product cooling method according to claim 14.
[Claim 16]
　The moving step, the predetermined shape said second cooling medium by ejecting the feed direction each second cooling device in which a plurality arranged along the steel obtained by contacting the outer shape of the steel arranged in reflecting of the by the second cooling device is connected, the injection interval in the feeding direction of the second cooling medium is passive movement process is kept constant, respectively
, characterized in that to a method of cooling steel according to claim 15.
[Claim 17]
　The moving step, the predetermined shape said second cooling medium by ejecting the feed direction each second cooling device in which a plurality arranged along the steel obtained by contacting the outer shape of the steel arranged in reflecting of the moving direction of the second cooling device is a passive moving process as defined by a guide
, wherein the method of cooling steel according to claim 15.
[Claim 18]
　The moving step, in response to the predetermined shape of the plan given to the steel, the ejection position of the second cooling medium is an active movement step of moving actively
, characterized in that, according steel cooling method according to claim 15.
[Claim 19]
　In the second cooling step, from a plurality of positions along the circumferential direction of the steel the second cooling medium to flow controllably injected independently of one another
, characterized in that, the claims 14-18 steel cooling method according to any one.
[Claim 20]
　As the second cooling medium adjacent to each other in the circumferential direction does not intersect one another until impinging on the steel, injection position of the second cooling medium is arranged
, characterized in that , steel cooling method according to claim 19.
[Claim 21]
　Upstream position than the collision position of the steel to be in the most upstream position of the second cooling medium, further comprising a first water draining step of draining said first cooling medium toward the downstream side
that wherein the steel product cooling method according to any one of claims 14-20.
[Claim 22]
　In each of the plurality of locations, downstream position than the collision position between the steel and the second cooling medium, which further plurality have a second draining step for draining the second cooling medium toward the downstream side
that wherein, steel cooling method according to any one of claims 14-21.
[Claim 23]
　At least one further having a pulsation step of applying the pulsation of the second cooling medium
, characterized in that, the steel cooling method according to any one of claims 14-22.
[Claim 24]
　At least, greater than the momentum of the first cooling medium momentum of those injected at the most upstream position is injected to adjacent positions of the most upstream position of the second cooling medium
, characterized in that, according steel cooling method according to any one of claims 14-23.