The name of the invention: hat-shaped cross-section parts method of manufacturing
Technical field
[0001]
　The present invention relates to a method for producing a hat-shaped cross section part which is a hat-shaped cross-section.
Background technique
[0002]
　As the structural members constituting the automobile body of the skeleton, for example, the front side members hat-shaped cross section and shape press-molded parts as in (herein also referred to as "hat-shaped cross-section part") is known. Further, such a hat-shaped cross section part is formed by performing press working (drawing) or the like on a metal plate (e.g. steel) which is a material (e.g., Japanese Patent Application Publication 2003-103306, JP-Japan country Patent application Publication No. 2004-154859, and see the patent application publication 2006-015404 JP Japan).
[0003]
　By the way, when the hat-shaped cross-section parts in so-called spring back after molding occurs, the hat-shaped cross-section parts so that the tip side of the vertical wall of the hat-shaped cross-section parts are open in the width direction is formed. Listing Therefore, in order to suppress the spring back in the hat-shaped cross section parts, hat-shaped cross-section parts which are press-formed (hereinafter, provisionally molded product hereinafter) to shape increase the vertical wall in the width direction of the temporary molded product there is a case to be like. In this case, for example, per preformed article caused the spring back to the punch shoulder part or the like of the wrist-like, there is a problem that the temporary molded product not be placed in a regular position with respect to the punch.
[0004]
　In contrast, the temporary molded product after is accommodated in the molded recess of the die, lists the punch is inserted into the molding recess of the die a hat-shaped cross-section parts like molding by a support member which is extended from the punch to the die side press molding method is disclosed (for example, see Japanese Japanese Patent application Publication 2008-307557).
Summary of the invention
Problems that the Invention is to Solve
[0005]
　However, in the above press molding method, when the temporary molded article was housed in the molding recess of the die, the leading end portion of the vertical walls of the temporary molded product caused springback hits the opening edge of the molding recess of the die in the position of the preliminarily molded article is decided for the die in the width direction of the preformed article. Therefore, the position relative to the temporary moldings die in the width direction of the temporary molded product is a problem of unstable.
[0006]
　The present disclosure relates to consideration of the circumstances described above, to obtain a manufacturing method of the hat-shaped cross section part that can stabilize the position relative to the temporary moldings die during restriking molding.
Means for Solving the Problems
[0007]
　Method for producing a hat-shaped cross-section parts to solve the above problem is to place the temporary molded article forming a hat-shaped cross-section between the restrike punch and restrike die arranged opposite one another, for the restriking and support a process that supports the top plate of the temporary molded article by a support member that is extended to the list like for the die-side from the punch side for the list-like from the punch, it is formed on the list like for the die and the list like punch as well as holding the top plate by the first recess the support member and the list-like die internally to accommodate the top plate of which forms the upper face side of the molded recess that has been open to the side, the temporary molded the positioning step of positioning the temporary molded article in the width direction a pair of longitudinal walls extending from both widthwise ends of the top plate and by the said first recess, constitute an opening side of the forming recesses and the first recess in the article and the list like punch is inserted into the interior of the second recess width dimension is set to be larger than, and a list-like process that lists like the temporary molded article and the list like punch by and the list-like die , it is equipped with a.
[0008]
　According to the manufacturing method of the hat-shaped cross-section parts to solve the problems described above, the list is like a punch and restrike die is arranged to face each other, hat between the restrike punch and restrike die preformed article is arranged to form a cross. And, by the support member is extended from the list like a punch to the list like for the die-side, top plate of the temporary molded article is supported from the list like punch side.
[0009]
　In addition, the list-like die, opened molded recess to list like punch side is formed. Portion constituting the top face of the molded recess is a first recess, the portion constituting the opening side of the forming recessed portion is a second recess, the second recess is larger set width than the first recess It is. And, to accommodate the top plate of the temporary molded products in the interior of the first recess, to holding the top plate of the temporary molded article by a support member and a list-like die. In this state, insert a list like punch to the inside of the second recess, to list like a temporary molded article by a list-like punch and a list-like die. Thus, it is possible to increase the dimensional accuracy of the hat-shaped cross section parts.
[0010]
　Here, in the positioning step, a pair of vertical walls extending from both widthwise ends of the top plate in the temporary molded product, a first recess, the preformed article is positioned in the width direction by. That is, a portion with a first recess of the base end side of the small pair of vertical walls affected by the spring back (top plate side), position relative to restrike die of the preformed article is determined in the width direction of the preformed article. Therefore, the position relative to the temporary molded products die can be stabilized during restriking molding.
Effect of the invention
[0011]
　According to the manufacturing method of the hat-shaped cross section part of the present disclosure, the position relative to the temporary molded products die can be stabilized during restrike molding, has an excellent effect that.
Brief description of the drawings
[0012]
[Figure 1A] Figure 1A is a perspective view showing an example of a temporary curved part molded by the first step in the production method of the hat-shaped cross section part according to the present embodiment.
[FIG 1B] Figure 1B is a plan view of the temporary bending parts shown in FIG. 1A from above.
[Figure 1C] Figure 1C is a side view of a provisional curved parts as seen from one side in the width direction shown in Figure 1A.
[Figure 1D] Figure 1D is a front view of the temporary bending parts shown in FIG. 1A from one side in the lengthwise direction.
FIG. 2 is a perspective view of the provisional bend parts corresponding to FIG. 1A for explaining a ridge portion corresponding to the concave curved portion and the convex curved portion.
[Figure 3A] Figure 3A is a perspective view of a material metal sheet before molding.
[Figure 3B] Figure 3B is a perspective view showing a diaphragm panel.
[4] FIG 4 is a perspective view corresponding to Figure 3B showing the easy site cracks and wrinkles occur in the diaphragm panel.
[5] FIG 5 is an exploded perspective view showing a main portion of a manufacturing apparatus used in the first step.
[Figure 6A] Figure 6A is a cross-sectional view showing a process at the start stage of the manufacturing apparatus shown in FIG.
[Figure 6B] Figure 6B is the manufacturing apparatus shown in FIG. 5 is a sectional view showing the die and the pad, a holder and the punch, the step of the material metal sheet is nipped and restrained by.
[FIG 6C] FIG 6C is a sectional view showing a step of pushed punch from stage shown in Figure 6B.
[FIG 6D] FIG. 6D, further pushing the punch from stage shown in FIG. 6C, a cross-sectional view showing a state in which the punch is pushed completely against the die.
[7] FIG. 7 is an exploded perspective view showing the other manufacturing apparatus used in the first step.
[Figure 8A] Figure 8A is a sectional view showing a process at the start stage of the manufacturing apparatus shown in FIG.
[Figure 8B] Figure 8B is the manufacturing apparatus shown in FIG. 7 is a sectional view showing the die and the pad, a holder and the punch, the step of the material metal sheet is nipped and restrained by.
[Figure 8C] Figure 8C is a sectional view showing a step of pushed punch from stage shown in FIG. 8B.
[Figure 8D] Figure 8D, further pushing the punch from stage shown in FIG. 8C, a cross-sectional view showing a state in which the punch is pushed completely against the die.
[Fig. 9A] Fig. 9A shows a completely pushed into the die punch, the material metal plate after molding to the provisional curved parts, the mold for explaining the problems that can occur when taking out a provisional curved parts from the mold it is a cross-sectional view.
[FIG 9B] FIG 9B is a sectional view showing a mold in a step of retracting the punch from the state shown in FIG. 9A with respect to the die.
[FIG 9C] FIG 9C is a cross-sectional view showing a mold in a stage where fully retracted punch from the state shown in FIG. 9B with respect to the die.
[Fig. 10A] FIG. 10A is a cross-sectional view showing a mold of completely pushed in to the die punch.
[FIG 10B] FIG 10B is a sectional view showing a mold in a step of retracting the punch from the state shown in FIG. 10A with respect to the die.
[FIG 10C] FIG 10C is a sectional view showing a mold in a stage where fully retracted punch from the state shown in FIG. 10B with respect to the die.
[FIG 11A] FIG 11A is a sectional view showing a mold showing the punch fully pressed in the die.
[FIG 11B] FIG 11B is a sectional view showing a mold in a step of retracting the punch from the state shown in FIG. 11A with respect to the die.
[FIG 11C] FIG 11C is a sectional view showing a mold in a stage where fully retracted punch from the state shown in FIG. 11B with respect to the die.
[FIG 12A] FIG 12A is a perspective view showing another temporary curved part molded by the first step.
[FIG 12B] FIG 12B is a plan view of the temporary bending parts shown in Figure 12A from above.
[FIG 12C] FIG 12C is a side view of a provisional curved parts as seen from one side in the width direction shown in FIG. 12A.
[FIG 12D] FIG 12D is a front view of the temporary bending parts shown in FIG. 12A in the longitudinal direction of one side.
[FIG 13A] FIG 13A is a perspective view showing another temporary curved part molded by the first step.
[FIG 13B] FIG 13B is a plan view of the temporary bending parts shown in Figure 13A from above.
[FIG 13C] FIG 13C is a side view of a provisional curved parts as seen from one side in the width direction shown in FIG. 13A.
[FIG. 13D] FIG 13D is a perspective view of the provisional bending parts shown in FIG. 13A from the bottom side.
[FIG 14A] FIG 14A is a perspective view showing another temporary curved part molded by the first step.
[FIG 14B] FIG 14B is a plan view of the temporary bending parts shown in Figure 14A from above.
[FIG 14C] FIG 14C is a side view of a provisional curved parts as seen from one side in the width direction shown in FIG. 14A.
[FIG 14D] FIG 14D is a front view of the temporary bending parts shown in FIG. 14A from the other longitudinal side.
[FIG 15A] FIG 15A is a perspective view showing another temporary curved part molded by the first step.
[FIG 15B] FIG 15B is a plan view of the temporary bending parts shown in Figure 15A from above.
[FIG 15C] FIG 15C is a side view of a provisional curved parts as seen from one side in the width direction shown in FIG. 15A.
[FIG 15D] FIG 15D is a front view of the temporary bending parts shown in FIG. 15A from the other longitudinal side.
[FIG 16A] FIG 16A is a perspective view showing another temporary curved part molded by the first step.
[FIG 16B] FIG 16B is a plan view of the temporary bending parts shown in Figure 16A from above.
[FIG 16C] FIG 16C is a side view of a provisional curved parts as seen from one side in the width direction shown in FIG. 16A.
[FIG 16D] FIG 16D is a perspective view of the provisional bending parts shown in FIG. 16A from the bottom side.
[FIG 17A] FIG 17A is a perspective view showing another temporary curved part molded by the first step.
[FIG 17B] FIG 17B is a plan view of the temporary bending parts shown in Figure 17A from above.
[FIG 17C] FIG 17C is a side view of a provisional curved parts as seen from one side in the width direction shown in FIG. 17A.
[FIG 17D] FIG 17D is a perspective view of the provisional bending parts shown in FIG. 17A from the bottom side.
[FIG 18A] FIG 18A is a perspective view of a material metal sheet before the pre-processing is performed.
[FIG 18B] FIG 18B is a perspective view of a material metal sheet pre-processing is performed.
[FIG 18C] FIG 18C is a perspective view showing a temporary bending parts pre machining molded from the material metal sheet which has been subjected.
[FIG. 18D] FIG 18D is a perspective view showing a state in which trim the provisional curve components shown in FIG. 18C.
[19] FIG 19 is a perspective view showing an example of an intermediate curved part which has been processed by the second step in the production method of the hat-shaped cross section part according to the present embodiment.
[20] FIG 20 is a side view of the intermediate curved part from one side in the width direction shown in FIG. 19.
[21] FIG 21 is a perspective view showing a main portion of a manufacturing apparatus used in the second step.
[FIG 22A] FIG 22A is a perspective view showing a machining starting stage of the manufacturing apparatus shown in FIG. 21.
[FIG 22B] FIG 22B, move the stage from the pad and the die shown in FIG. 22A, a perspective view showing a step of the top plate of the temporary curved part is sandwiched and restricted by the pad and the punch.
[FIG 22C] FIG 22C is a perspective view showing a step of bending and stretching step extending bent vertical walls of one side in the longitudinal direction of the provisional bend parts of the die from step move relative to the punch side, shown in Figure 22B.
[FIG. 22D] FIG 22D is a perspective view showing a step of unbending step bent back in the longitudinal direction other side of the longitudinal wall of the provisional bend parts of the holder from step move relative to the die side, shown in Figure 22C.
[23] FIG 23, in a stage shown in FIG. 22B, the cross-sectional view (FIG. 22B showing a state where the longitudinal direction of one side portion of the top plate of the temporary curved part is sandwiched and restricted by the pad and the punch 23 a -23 cross-sectional view taken along a line).
FIG. 24 is 24 in the stage shown in FIG. 22B, cross-sectional view showing a state of being sandwiched and constrained other longitudinal side portion of the top plate of the temporary bending part by the pad and the punch (in FIG. 22B a -24 cross-sectional view taken along a line).
[25] FIG 25 is a sectional view showing a step of unbending step shown in FIG. 22D.
[FIG 26A] FIG 26A is a perspective view showing a state before the temporary bending part in the second step is processed.
[FIG 26B] FIG 26B is a perspective view showing a state of provisional curved part which has been processed by bending and stretching step of the second step.
[27] FIG 27 is a perspective view showing an example of a completed curved part which has been processed by the third step in the production method of the hat-shaped cross section part according to the present embodiment.
[28] FIG 28 is a sectional view seen from the longitudinal direction showing an example of a completed curved part which has been processed by the third step in the production method of the hat-shaped cross section part according to the present embodiment (28-28 in FIG. 27 it is a line cross-sectional view).
[FIG 29A] FIG 29A is the manufacturing apparatus used in the third step, a cross-sectional view showing a step of the top plate of the intermediate curved part is supported from the apparatus underside by the support member.
[Figure 29B] Figure 29B, the stage shown in FIG. 29A, the top plate of the intermediate curved part, is fitted in the first recess of the die, a cross sectional view illustrating a step which is sandwiched and constrained by the die and the support member is there.
[FIG 29C] FIG 29C is a sectional view showing a step of pushed punch from step to a second recess of the die shown in Figure 29B.
[FIG 29D] FIG 29D is further pushed punch from stage shown in FIG. 29C to the second recess of the die, a cross-sectional view showing a state in which the punch is pushed completely against the die.
[FIG 30A] FIG 30A, in another production apparatus used in the third step, a cross-sectional view showing a step of the top plate of the intermediate curved part is supported from the apparatus underside by the support member.
[FIG 30B] FIG 30B is the stage shown in FIG. 30A, the top plate of the intermediate curved part, is fitted in the first recess of the die, a cross sectional view illustrating a step which is sandwiched and constrained by the die and the support member is there.
[FIG 30C] FIG 30C is a sectional view showing a step of pushed punch from step to a second recess of the die shown in Figure 30B.
[FIG 30D] FIG 30D is further pushed punch from stage shown in Fig. 30C in the second recess of the die, a cross-sectional view showing a state in which the punch is pushed completely against the die.
[FIG 31A] FIG 31A, in another production apparatus used in the third step, a cross-sectional view showing a step of the top plate of the intermediate curved part is supported from the apparatus underside by the support member.
[FIG 31B] FIG 31B is the stage shown in FIG. 31A, the top plate of the intermediate curved part, is fitted in the first recess of the die, a cross sectional view illustrating a step which is sandwiched and constrained by the die and the support member is there.
[FIG 31C] FIG 31C is a sectional view showing a step of pushed punch from step to a second recess of the die shown in Figure 31B.
[FIG 31D] FIG 31D is further pushed punch from stage shown in FIG. 31C to the second recess of the die, a cross-sectional view showing a state in which the punch is pushed completely against the die.
[FIG 32A] FIG 32A, in another production apparatus used in the third step, a cross-sectional view the top plate of the intermediate curved part corresponding to FIG. 31A showing a supported phase from the apparatus lower by a support member.
[FIG 32B] FIG 32B is the stage shown in FIG. 32A, the top plate of the intermediate curved part, is fitted in the first recess of the die, Figure 31B showing a step which is sandwiched and constrained by the die and the support member it is the corresponding cross-sectional view.
[FIG 32C] FIG 32C is a sectional view corresponding to FIG. 31C showing a pushed it out of the punch from the stage shown in FIG. 32B in the second recess of the die.
[FIG 32D] FIG 32D is further pushed punch from stage shown in FIG. 32C the second recess of the die, the punch is a sectional view corresponding to FIG. 31D showing a state in which the fully depressed relative to the die .
[FIG 33A] FIG 33A is a stress generated in the longitudinal wall is a perspective view of a provisional bending parts shown schematically.
[Fig. 33B] Fig. 33B is a perspective view of a provisional curved parts showing the shear wrinkles occurring in the vertical wall.
[Figure 33C] FIG. 33C is a side view of the provisional curved parts showing the shear wrinkles occurring in the vertical wall.
[FIG 34A] FIG 34A is a sectional view showing a manufacturing apparatus for explaining the dimensions of respective parts for preventing the occurrence of shear wrinkles.
[FIG 34B] FIG 34B is a sectional view showing a temporary bending part of the cross section for illustrating the dimensions of each part in order to prevent the occurrence of shearing wrinkles.
[FIG 34C] FIG 34C is a sectional view showing a manufacturing apparatus for explaining the dimensions of respective parts for preventing the occurrence of shear wrinkles.
[FIG 34D] FIG 34D is a sectional view showing a temporary bending part of the cross section for illustrating the dimensions of each part in order to prevent the occurrence of shearing wrinkles.
[35] FIG 35 is a table for explaining the occurrence of wrinkles of the provisional bend part when changing various parameters in the first step.
[FIG 36A] FIG 36A is a perspective view showing a temporary curved part manufactured by the manufacturing apparatus shown in FIG.
[FIG 36B] FIG 36B is a plan view of the temporary bending parts shown in Figure 36A from above.
[FIG 36C] FIG 36C is a side view of a provisional curved parts as seen from one side in the width direction shown in FIG. 36A.
[FIG 36D] FIG 36D is a front view of the temporary bending part from one side in the lengthwise direction as shown in FIG. 36A.
[37] FIG 37 is a cross-sectional view of a mold showing the clearance in the table of FIG. 35.
[38] FIG 38 is a perspective view showing an example of a completed curved parts obtained by processing the temporary curved parts through the first step in the production method of the hat-shaped cross-section parts of the embodiment by the third step.
DESCRIPTION OF THE INVENTION
[0013]
　A method for manufacturing a hat-shaped cross section part according to the present embodiment will be explained with reference to the drawings. Method of manufacturing a hat-shaped cross-section parts, change the first step as a "provisional molding process" for forming a temporary molded products (shear molding process), the height of the temporary molded products processing (molding) to provisional molded article to a second step of the "intermediate step" includes a third step of restriking the temporary molded article after the second step. The following describes each of the above steps. Note that like the same members in the drawings are denoted by the same reference numerals, those described above for the same members in the following description, are appropriately omitted.
[0014]
(For the first step)
　as shown in FIG. 5, in a first step, by performing drawing process the material metal sheet 601 by the manufacturing apparatus 500, the provisional bend part as "temporary molded product" and "bail" 10 (see FIG. 2) is molded. Below, it describes the structure of the provisional curved parts 10 at the beginning, and then describes the manufacturing apparatus 500 will be explained and then the first step in for.
[0015]
(Provisional curved configuration of the component 10)
　as shown in FIGS. 1A ~ FIG 1D and 2, the provisional bending part 10 is formed into an elongated shape, it is formed in a hat shape in cross section as viewed from the longitudinal ing. Vertical Specifically, temporary curved part 10, a top plate 11 extending in the longitudinal direction, extending bent toward both sides in the width direction of the top plate 11 on the lower side, respectively (thickness on one side of the top plate 11) and a wall 12a, and 12b, and. Also, temporary curved part 10 has a vertical wall 12a, a flange 13a extending bent respectively from (the end opposite to the top plate 11) outward in the width direction of the top plate 11 the lower end of 12b, a 13b, and .
[0016]
　Top plate 11 and the vertical wall 12a, between the 12b each ridge line 14a extending along a longitudinal direction of the provisional bend parts 10, 14 b are formed. Further, the vertical wall 12a, respectively and the flange 13a of 12 b, talweg 15a extending along a longitudinal direction of the provisional bending part 10 between the 13 b, 15 b are formed.
[0017]
　Ridge line 14a, 14b and talweg 15a, and extends substantially parallel to the 15b. That is, the flanges 13a, a vertical wall 12a extending respectively from 13b to the upper side (thickness of the top plate 11 other side), the height of 12 b, are substantially constant along the longitudinal direction of the provisional bend part 10.
[0018]
　As shown in FIG. 2, a portion of the top plate 11, the convex curved portion 11a which is curved in an arc to the outside of the cross section of the hat, i.e. the outer surface side of the top plate 11 (thickness direction other side) There are formed, on another part of the top plate 11, the concave curved portion 11b which is curved arcuately inwardly of the cross-sectional shape of the hat-shaped, i.e. the inner surface of the top plate 11 (plate thickness direction one side) There has been formed. In the convex curved portion 11a, the concave curved portion 11b, the top plate 11 and the vertical wall 12a, the ridge line 14a between the 12b, 14b also convex curved portion 11a, site 16a which corresponds to the concave curved portion 11b, 16b and 17a, It is curved in an arc in 17b. Where "arcuate" is not intended to be limited to a part of a complete circle, for example, elliptical, hyperbolic, it may be part of a sinusoidal curve other curve.
[0019]
　Provisional bending parts 10 described above, to form a panel 301 diaphragm by applying a drawing into a rectangular shape of the material metal sheet 201 as a "metal plate" shown in FIG. 3A (see FIG. 3B), the diaphragm panel 301 It is formed by trimming the unnecessary part of.
[0020]
　Incidentally, in the case of manufactured through a drawing process a temporary bending part 10 having the hat-shaped cross-section, as shown in FIG. 4, at the stage of molding a diaphragm panel 301, a top plate of the concave curved portion of the aperture panel 301 material is too much in the flange 301b of the 301a and the convex curved portion wrinkles are likely to occur. In order to suppress the occurrence of wrinkles, and increasing the pressure of the blank holder, or such as by adding the site to form a drawbead blank holder, increase the restraint of the surrounding material metal plate 201 in the molding process, material metal it is known to be effective to inhibit the influx into the blank holder plate 201.
[0021]
　However, to strengthen the suppression of the inflow into the blank holder of the material metal plate 201, the convex curved portion of the top plate 301c of the aperture panel 301, of the concave curved portion flange 301d, the longitudinal direction of both ends 301e, various sections, such as 301e in reduced thickness is large, when the material metal sheet 201 is stretched of particularly low material (e.g. high-tensile steel), it is considered that the crack occurs in these portions.
[0022]
　Therefore, the curved parts such is a hat-shaped cross-section as the front side member or the like constituting a part of a vehicle body of the scaffold, by press molding by draw-forming, in order to produce without generating wrinkles and cracks, elongation it is difficult to use a low sexual high strength material as a material metal sheet 201, we had to use a high elongation, low strength material.
[0023]
　However, by going through the first step to be described later with reference to fabrication apparatus 500 of the present embodiment, it is possible to suppress the occurrence of the wrinkles and cracks.
[0024]
(For manufacturing apparatus 500)
　Next, the manufacturing apparatus 500 will be explained. Figure 5 shows an exploded perspective view of a production apparatus 500 used for manufacturing the provisional bending part 501 as a "temporary molded article" is. The configuration of the temporary bending part 501 is substantially the same configuration as the temporary bending part 10 (see FIG. 1A). Further, FIG. 6A is a sectional view showing the time of processing start of the manufacturing apparatus shown in FIG. 5, FIG. 6B, in the manufacturing apparatus shown in FIG. 5, a temporary molding die 502 and the preformed pads 503, preformed It is a cross-sectional view of material metal plate 601 shows a sandwich and constrained stage between the use blank holder 505 and the temporary molding punch 504, FIG. 6C, shoved the provisional molding punch 504 from the stage shown in FIG. 6B is a sectional view showing a step further, FIG. 6D, further pushing the preformed punch 504 from the stage shown in FIG. 6C, a state in which the preformed punch 504 is pushed completely against the provisional molding die 502 it is a cross-sectional view showing a.
[0025]
　As shown in FIG. 5, the manufacturing apparatus 500, the temporary vertical wall 501a of the curved parts 501, 501b and the flange 501d, the provisional molding die 502 having a shape corresponding to the shape of each of the outer surface side of 501e (hereinafter, simply as the "die 502 '), the preformed pads 503 having a shape corresponding to the shape of the outer surface of the top plate 501c (hereinafter, which is simply configured to include a, and the" pad 503 "). The manufacturing apparatus 500 preliminarily molded with the top plate 501c of the die 502 and is disposed so as to face the pad 503 provisionally curved part 501, the vertical wall 501a, a shape corresponding to the shape of each of the inner surface side of the 501b use a punch 504 (hereinafter, simply referred to as "punch 504") and a flange 501d, preliminarily molded blank holder 505 as a "preformed holder" having a shape corresponding to the shape of the inner surface side of 501e (hereinafter, simply " a blank that holder 505 "), and a.
[0026]
　As shown in FIGS. 6A ~ FIG 6D, the die 502 and the punch 504 are positioned to face the apparatus vertically, the die 502 is placed in the apparatus above the punch 504. This central portion in the width direction of the die 502 (left-right direction), the recess 502a which is opened on the device bottom (punch 504 side) is formed. Further, the inner peripheral surface of the concave portion 502a of the die 502, the vertical wall 501a of the provisional bend parts 501, there is a forming surface corresponding to the shape of the outer surface of 501b (see FIG. 5). Furthermore, device lower in the both side portions in the width direction of the die 502 the end face of the (blank holder 505 side), a flange 501d, upper surface of the 501e of the provisional bend part 501 (the surface of the vertical wall 501a, 501b (see FIG. 5) side) It is a forming surface corresponding to the shape. Also, the closed end of the recess 502a formed in the die 502 (the upper end), the pad pressure device 506 to be described later is fixed. Furthermore, the die 502, for example a gas cushion, a hydraulic device, a spring is coupled to the mobile device 509 such as an electric drive. Then, the die 502 is moved in the device vertically by the mobile device 509 is activated.
[0027]
　Pad 503 is disposed in a recess 502a formed in the die 502, the pad 503 is, for example the gas cushion, a hydraulic device, a spring is coupled to the pad pressure device 506, such as an electric drive. The surface of the die 502 side of the pad 503 is a forming surface including the shape of the outer surface of the top plate 501c of the temporary bending part 501 (see FIG. 5). Then, by pad pressure device 506 is operated, the pad 503 is pressed toward the punch 504 side, a central portion 601a in the width direction of the material metal sheet 601 (left-right direction) between the pad 503 and the punch 504 It is adapted to be pressurized and nipped in between.
[0028]
　Punch 504 is formed by a portion facing in the vertical direction with the pads 503 in the lower mold is convex toward the pad 503 side, on the side of the punch 504, the blank holder will be described later pressurization 507 is fixed. Further, the outer surface of the punch 504, there is a temporary vertical wall 501a of the curved parts 501, 501b and the top plate 501c forming surface corresponding to the shape of the inner surface (see FIG. 5).
[0029]
　Blank holder 505, for example a gas cushion, a hydraulic device, a spring is coupled to the blank holder pressure device 507 as a holder pressurizing device, such as an electric drive. Further, the end faces of the device upper side in the blank holder 505 (the die 502 side), a flange 501d of the provisional bend parts 501, corresponding to the shape of the (surface opposite to the vertical wall 501a, and 501b (see FIG. 5)) the lower surface of the 501e It has been with the molding surface. Then, by the blank holder pressure device 507 is actuated, the blank holder 505 is pressed toward the die 502 side, the width direction of the both side portions 601b of the material metal sheet 601, 601c by the die 502 and the blank holder 505 It is adapted to be pressurized and nipped.
[0030]
　Next, a description will be given of the first step of pressing the material metal plate 601 by the manufacturing equipment 500.
[0031]
　First, as shown in FIG. 6A, the material metal sheet 601, the die 502 and the pads 503, the punch 504 and the blank holder 505 is disposed between the.
[0032]
　Next, as shown in Figure 6B, the central portion 601a of the material metal sheet 601 (i.e., a top plate 501c in the material metal plate 601 (the portion see FIG. 5) is molded) is pressed against the punch 504 by the pad 503 It is, is pressure and sandwiched between them. In addition, both sides portion 601b of material metal plate 601, 601c (that is, the vertical wall 501a in material metal plate 601, 501b and flange 501d, 501e (the part that refer to FIG. 5) is molded, respectively), the die 502 by the blank holder 505 pressed against the, it is pressure and sandwiched between them.
[0033]
　Further, by pad pressure device 506 and the blank holder pressure device 507 is operated, the central portion 601a and the both side portions 601b of the material metal sheet 601, 601c are pressurized and nipped at a predetermined pressing force. As a result, the central portion 601a and side portions 601b, 601c of the material metal sheet 601 is formed in a curved shape along the curved shape of the pressurized 圧湾 surfaces.
[0034]
　In this state, the mobile device 509 operates is, the blank holder 505 and the die 502 by being moved (lowered) to the device bottom, temporary curved part 501 is molded. In addition, the pad pressure device 506 and the blank holder pressure device 507 as the die 502 is lowered shrinks in the vertical direction. In case the pad pressure device 506 and the blank holder pressure device 507 contracts in the vertical direction, a central portion 601a and the both side portions 601b of the material metal sheet 601, 601c is pressurized with a predetermined pressing force.
[0035]
　As shown in FIG. 6C, according to the blank holder 505 and the die 502 is moved to the device bottom, material metal sheet 601 which is sandwiched between the die 502 and the blank holder 505, a punch 504 and the blank holder 505 vertical wall 501a flows into the recess 502a between, 501b (see FIG. 5) is gradually formed.
[0036]
　Then, as shown in FIG. 6D, the blank holder 505 and the die 502 is moved a predetermined distance, the vertical wall 501a, the molding is completed at the time when the height 501b becomes a predetermined height.
[0037]
　Here, in the example shown in FIGS. 6A ~ FIG 6D, in a state where the punch 504 and the pads 503 do not move, was molded provisional bending part 501 by moving the blank holder 505 and the die 502 to the device bottom. However, the present invention is not limited thereto, may be molded provisional bending part 501 as described below.
[0038]
　Figure 7 is another manufacturing apparatus 600 for manufacturing the provisional bending part 501 is shown. Also, FIG. 8A is a sectional view showing a process at the start stage of the manufacturing apparatus shown in FIG. 7, FIG. 8B, the provisional molding die 602 (hereinafter, simply referred to as a die 602) of the manufacturing apparatus shown in FIGS. 7 and provisional molding pad 603 (hereinafter, simply referred to as pad 603) and, provisional molding blank holder 605 (hereinafter, simply referred to as the blank holder 605) and the temporary molding punch 604 (hereinafter, simply referred to as punch 604) material metal between the is a sectional view showing a step of the plate 601 is sandwiched and constrained, FIG. 8C is a sectional view showing a step of pushed the punch 604 from the stage shown in FIG. 8B, FIG. 8D, a punch from the stage shown in FIG. 8C 604 further pushed in, and a cross-sectional view showing a state in which the punch 604 is fully depressed relative to the die 602.
[0039]
　Manufacturing apparatus 600, unlike FIG. 5 and FIGS. 6A ~ FIG 6D hat-shaped cross-section parts of the manufacturing apparatus 500 shown in, the blank holder 605 and the punch 604 are provided in the apparatus above the die 602 and pads 603. In the manufacturing apparatus 600, together with the fixing die 602, with the blank holder 605 does not move against the material metal sheet 601 in a die 602, a provisional bending part 501 by moving the pad 603 and the punch 604 (lowering) Form. In the manufacturing apparatus 600 and the manufacturing equipment 500, the relative movement of the mold is the same, it is possible to mold the material metal sheet 601 in the provisional curve part 501 With either fabrication apparatus 500, 600 .
[0040]
　Then, the material metal sheet 601 after the pressing, i.e., after forming the provisional bend parts 501, step will be described taking out from the temporary bending part 501 a manufacturing apparatus 500 (the mold).
[0041]
　Meanwhile, as shown in FIGS. 9A ~ Figure 9C, to release from the temporary bending part 501 a manufacturing apparatus 500 (the mold), the mold away from the punch 504 and die 502 to the device upward from the state of FIG. 6D it may be Akere the gap between. In this case, as shown in FIGS. 9B and 9C, when the pad 503 and the blank holder 505 is pressurized by the pad pressure device 506 and the blank holder pressure device 507, respectively, provisionally curved part 501, releasing during, because it would undergo pressing force toward opposite directions from the pad 503 and the blank holder 505, temporary curved part 501 as shown in FIG. 9C by pressure directed to this opposite direction is deformed It collapses on.
[0042]
　Therefore, as shown in FIGS. 10A ~ FIG 10C, a material metal sheet 601 after forming the temporary curved part 501, the blank holder 505 so as not to move relative the punch 504, bending the blank holder 505 is molded the parts in the state of being so as not pressed against the die 502, release the die 502 and the pad pressure device 506 from the blank holder 505. Then, the pad 503 to the pad pressure device 506 is extended to the end of the stroke although the pressurized curved parts, stretched pad pressure device 506 to the stroke end pad pressure device 506 is moved above a certain distance after, the pad 503 is moved away from the punch 504. Thus, without temporary bending part 501 is subjected to simultaneous pressure from the pad 503 and the blank holder 505, the die 502 and pads 503, it can be separated and the blank holder 505 and the punch 504, to deform the provisional bending parts 501 it can be removed from the mold without.
[0043]
　Other embodiments, as shown in FIGS. 11A ~ FIG 11C, after forming the material metal sheet to the temporary bending part 501, the pad 503 so as not to move relative the die 502, the pad 503 is molded the provisional curved parts 501 so as not pressed against the punch 504. In this state, the pad 503 and # 502, and away from the blank holder 505 and the punch 504, to the blank holder pressure device 507 is extended to the stroke end, the blank holder 505 is pressurized the curved parts. And, then when the blank holder pressure device 507 die 502 is moved above a certain distance is cut extends to the end of the stroke the blank holder 505 is moved away from the die 502. Thus, without temporary bending part 501 is subjected to simultaneous pressure from the pad 503 and the blank holder 505, the die 502 and pads 503, it is possible to release the blank holder 505 and the punch 504, the provisional bending part 501 from the mold it can be taken out.
[0044]
　Still other embodiments, although not shown, after forming the material metal sheet to the temporary bending part 501, the pad 503 so as not to move relative to the blank holder 505, the curved parts pad 503 was molded the so as not pressed against the punch 504. In this state, the pad 503 and the die 502 and the blank holder 505, and away from the punch 504, to the blank holder pressure device 507 is extended to the stroke end, the blank holder 505 is pressurized provisional curved parts 501. And, then when the blank holder pressure device 507 die 502 is moved above a certain distance is cut extends to the end of the stroke the blank holder 505 is moved away from the die 502. Thus, without temporary bending part 501 is subjected to simultaneous pressure from the pad 503 and the blank holder 505, the die 502 and pads 503, it is possible to release the blank holder 505 and the punch 504, the provisional bending part 501 from the mold it can be taken out.
[0045]
　Thus, in order to prevent damage to the temporary bending part 501 during mold release is producing a pressurization limit device which can prevent the temporary bending part 501 is subjected to simultaneous pressure from the pad 503 and the blank holder 505 it may be provided to the apparatus 500.
[0046]
　By the above, by but provisional curved part 501 as a temporary molded article is formed in the first step, the die 502 of the manufacturing equipment 500, pad 503, to change settings of the punch 504 and the blank holder 505 (shape, etc.) as appropriate , it is possible to change the shape of the provisional bend parts. Below, it shows a modification of the provisional curved parts.
[0047]
(Modification 1 of the provisional bend part)
　Provisional curved parts 100 of the preformed article shown in FIGS. 12A ~ FIG. 12D, not curved in side view together are curved in a generally S-shape in plan view. The provisional bending part 100 includes a top plate 102, the edge line 102a of the top plate 102, a vertical wall 104 which extends in parallel to each other along the 102b, a flange 108a formed at the tip end of the vertical wall 104, 106 is configured to include and 108b, the.
[0048]
　As shown in FIG. 12B, the top plate 102 is made of a flat plate which is curved into a substantially S-shape in a plane parallel to the plane of FIG. 12B, the flanges 108a, 108b are extended substantially parallel to the top plate 102 is set, a flat plate curved in a substantially S-shaped. Further, vertical wall 104 is a curved plate arranged parallel to each other along with being curved in a substantially S-shape in a thickness direction of the vertical wall 104.
[0049]
(Modification 2 of the provisional bend parts)
　as shown in FIGS. 13A ~ FIG 13D, a provisional bending part 110 as a tentative molded article, substantially S also in side view together are curved in a generally S-shape in plan view It is curved in shape. The provisional bending part 110 includes a top plate 112, the edge line 112a of the top plate 112, a vertical wall 114 which extends in parallel to each other along the 112b, a flange 118a formed at the tip end of the vertical wall 114, 116 is configured to include and 118b, the. Further, the top plate 112 is a curved plate which is curved in a substantially S-shape in a thickness direction of the top plate 112. Flanges 118a, 118b is extended substantially parallel to the top plate 112, like the top plate 112, the flange 118a, a curved plate which is curved in a substantially S-shape in the thickness direction of 118b. Vertical walls 114 and 116 is also a curved plate which is curved in a substantially S-shape in a thickness direction of the vertical wall 114.
[0050]
(Modification 3 of the provisional bend parts)
　as shown in FIGS. 14A ~ FIG 14D, a provisional bending part 120 as a tentative molded article, an intermediate portion in the longitudinal direction is curved in an arc in a side view. The provisional bending part 120 includes a top plate 122, the ridge line of the top plate 122 128a, and the vertical wall 124a, 124b which extend in parallel to each other along the 128b, the vertical wall 124a, a flange 126a which is formed at the tip of the 124b is configured to include and 126b, the. The vertical walls 124a, 124b and flange 126a, the talweg between 126b talweg 129a, there is a 129b.
[0051]
　The top plate 122 is made of a curved plate which is curved in the thickness direction of the top plate 122, the flange 126a, 126b is a curved plate that extends substantially parallel to the top plate 122. Further, the longitudinally intermediate portion of the top plate 122, the convex curved portion 122a which is curved arcuately at the outer surface side of the top plate 122 (thickness direction other side) is formed. Further, the vertical wall 124a, 124b is a flat plate parallel to the plane of FIG. 14C.
[0052]
(Modification 4 of the provisional bend parts)
　as shown in FIGS. 15A ~ FIG 15D, a provisional bending part 130 as a tentative molded article is curved as opposed to the temporary bending part 120 of the modification 3 in a side view there. The provisional bending part 130 includes a top plate 132, the edge line 132a of the top plate 132, a vertical wall 134, 136 which extend parallel to each other along the 132b, a flange molded into the distal end of the vertical wall 134 138a is configured to include and 138b, the. The top plate 132 is a curved plate that is curved in the thickness direction of the top plate 132, the flange 138a, 138b consists of a curved plate that extends substantially parallel to the top plate 132. Vertical wall 134, 136 is a flat plate parallel to the plane of FIG. 15C.
[0053]
(Modification 5 of the provisional bend parts)
　as shown in FIGS. 16A ~ FIG 16D, a provisional bending part 140 as a tentative molded article, a top plate 142, the edge line 142a of the top plate 142, along 142b parallel to each other and extending been vertical walls 144 and 146, a flange 148a which is formed at the tip of the vertical wall 144, 146 is configured to include and 148b, the. The top plate 142 is a curved plate which is curved in a substantially S-shape in a thickness direction of the top plate 142. Flanges 148a, 148b is substantially S-shaped curved plate that extends substantially parallel to the top plate 142. Vertical walls 144 and 146 are also made of a curved plate which is curved in a substantially S-shape in a thickness direction of the vertical wall 144. Then, in the provisional curve part 140, the flange 148a, 148b are not extended in the entire length of the vertical wall 144. In other words, the vertical walls 144 and 146 includes a part that does not have a flange 148a, a 148b. In Figure 16A ~ FIG 16D, the flange 148a, the length of 148b is set to a length shorter length than the vertical wall 144, 146 along the lower edge of one end vertical wall 144, 146 from the provisional curve part 140 there. In addition, the flange 148a is a long dimension than the flange 148b.
[0054]
(Modification 6 of the provisional bend parts)
　as shown in FIGS. 17A ~ FIG 17D, a provisional bending part 150 as a tentative molded article, a longitudinal direction while in a plan view along with curved into a substantially S-shaped in side view It has gradually become wider toward the side. The provisional bending part 150 includes a top plate 152, the edge line 152a of the top plate 152, a vertical wall 154 and 156 which extend parallel to each other along the 152 b, a flange formed at the distal end of the vertical wall 154 158a is configured to include and 158b, the. Top plate 152 is made of a curved plate which is curved in a substantially S-shape in a thickness direction of the top plate 152. Flanges 158a, 158b are composed of a curved plate that extends substantially parallel to the top plate 152. Each of the vertical wall 154 consists of a flat plate which is curved into a substantially S-shaped in side view as shown in Figure 24C. The width of the top plate 152 is gradually widened toward the end of one side of the temporary bending part 150. Further, the vertical wall 154 and vertical wall 156 are gradually spaced toward the end of one side of the temporary bending part 150.
[0055]
(Provisional bending Modification 7 parts)
　provisionally curved part 70 of the preformed article shown in FIG. 18D, pre processed metal plate which is formed by the pre-processing is performed on the material metal sheet is press-working is formed by the rear trimming is performed.
[0056]
　Rectangular material metal plate 72 shown in FIG. 18A, the pre-processed metal plate 72-1 is formed by a plurality of convex portions 74 shown in FIG. 18B is formed. Then, comprising by pressing is subjected to pre-processing metal plate 72-1 by the foregoing hat-shaped cross-section parts of the manufacturing apparatus 500 (see FIG. 5), as shown in FIG. 18C, unnecessary portions as a product provisional curved part 70-1 is formed. And, provisional curved parts 70, unnecessary portions of the provisional curved part 70-1 is shown in FIG. 18D by being trimmed is formed.
[0057]
　Here, as shown in FIG. 18C, the pre-processing metal plate 72-1 having a convex portion 74 at the time of molding by the manufacturing apparatus 500 (see FIG. 5), the top plate portion by the pad 503 to the punch 504 since pressing, it is conceivable that convex portions 74 was pre-processed is deformed. Therefore, a shape corresponding to the convex portion 74 on each of the pads 503 and the punch 504 are provided, it is preferable to allow pressurized and nipped without deforming the convex portion 74.
[0058]
(The second step)
　will be described second step. In the following description, it explained initially the configuration of the intermediate curved part 700 which is formed (processed) by the second step, and then describes the manufacturing apparatus 710 used in the second step will be described subsequently for the second step. In the following description, it is the case of molding the intermediate curved part 700 of the provisional bend part 120 as a "temporary molded products" by the second step.
[0059]
(Intermediate curved for the part 700)
　as shown in FIG. 19, the intermediate curved part 700 is formed in a cross-sectional hat-shaped forming a likewise elongated and provisionally curved part 120. That is, the intermediate curved part 700 includes a top plate 702 extending in the longitudinal direction, a pair of vertical walls 704a that extends from each of both widthwise ends of the top plate 702 to the lower side (thickness direction one side of the top plate 702), and 704b, vertical wall 704a, a pair of extending each from a lower end of 704b to the outside in the width direction of the top plate 702 flange 706a, is configured to include and 706b, the. In addition, the top plate 702 and the vertical wall 704a, the ridge line between the 704b is, the ridge line 708a, has been with the 708b, the vertical wall 704a, 704b and flange 706a, is talweg between 706b, talweg 709a, 709b It has been with. Further, the longitudinally intermediate portion of the top plate 702, the convex curved portion 702a which is curved arcuately at the outer surface side of the top plate 702 (thickness direction other side) is formed.
[0060]
　The intermediate curved part 700 is configured similarly to the temporary bending part 120 except as described below. That is, the width of the intermediate curved part 700 is set equal to the width of the temporary curved parts 120, intermediate curved part 700 (the vertical wall 704a, 704b) of the height dimension is provisionally curved part 120 (the vertical wall 124a , it is set to different dimensions and height of the 124b). It will be specifically described below. Since the intermediate curved part 700 forms a symmetrical shape in the width direction, in the following description, a description of the parts of one side in the widthwise direction of the intermediate curved part 700, the other widthwise side of the intermediate curved part 700 description of the parts will be omitted.
[0061]
　As shown in FIG. 20, the intermediate curved part 700, the portion in the longitudinal direction one side (specifically, the arrow A direction side portion of FIG. 20 with respect to the convex curved portion 702a) height of the temporary bending It is highly configured as compared to the height of the component 120. More specifically, the intermediate curved part 700 flange 706a-1 in the longitudinal direction on one side is, the intermediate curved part 700 relative to the flange 126a of the provisional bend part 120 (see flange 126a as shown by the two-dot chain line in FIG. 20) It is inclined away the lower (direction away from the top plate 702) as it goes toward the one side in the lengthwise direction. Therefore, the height of the vertical wall 704a-1 connected to the flange 706a-1 is set to be larger as it goes toward the one side in the longitudinal direction of the intermediate curved part 700.
[0062]
　Further, the intermediate curved part 700, the portion of the other longitudinal side (specifically, the arrow B direction side portion of FIG. 20 with respect to the vertical walls 704a-1 and the flange 706a-1) height of the temporary bending parts It is formed lower than the height of 120. Specifically, intermediate curved part 700 flange 706a-2 in the other longitudinal side, relative to the flange 126a of the provisional bend part 120 (see flange 126a as shown by the two-dot chain line in FIG. 20) of the intermediate curved part 700 It is inclined so as to approach the upper side (direction approaching the top plate 702) as it goes toward the other longitudinal side of the. Therefore, the height of the vertical wall 704a-2 that is connected to a flange 706a-2 is set to be smaller as it goes toward the other longitudinal side. Thus, the height dimension of the intermediate curved part 700 is configured to be larger as it goes from the end of the other longitudinal side of the intermediate curved part 700 in the longitudinal direction of one side.
[0063]
(Manufacturing apparatus 710 for)
　as shown in FIG. 21, the manufacturing apparatus 710, the intermediate molding die 711 constituting the apparatus upper part of the manufacturing apparatus 710 (hereinafter, simply referred to as "die 711") and the intermediate molded pad 712 (hereinafter, simply referred to as "pad 712") is configured to include a. The manufacturing apparatus 710, the intermediate formed punch 713 constituting the apparatus lower part of the manufacturing apparatus 710 (hereinafter, simply referred to as "punch 713") and the intermediate molded holder 714 (hereinafter, simply referred to as "holder 714") and , it is equipped with a. Incidentally, in FIG. 21, for convenience, the die 711 is illustrated as being divided in the width direction of the manufacturing apparatus 710, the die 711 is coupled integrally at the upper end thereof. Further, the holder 714 is also shown as being divided in the width direction of the manufacturing apparatus 710, but the holder 714 are also coupled together at its lower end.
[0064]
　FIGS 22A to FIG. 22D, and as shown in FIGS. 23 to 25, a die 711 is disposed in the apparatus above the punch 713. Further, the widthwise central portion of the die 711, the concave portion 711a which is opened to the apparatus bottom and is formed, the inner circumferential surface at the lower end of the recess 711a, the provisional bend parts 120 top plate 122 and the vertical wall 124a It is formed in a shape corresponding to the outer surface of 124b. That is, the width of the recess 711a are substantially the same in configuration and width of the outer surface of the temporary curved part 120 (intermediate curved part 700).
[0065]
　Further, the lower surface of the die 711 (the end face of the device lower side), the flange 706a of the intermediate curved part 700, there is a forming surface corresponding to the shape of the outer surface of 706b. Then, the die 711 is connected to a mobile device configured similarly to the mobile device 509 of the manufacturing apparatus 500 (not shown), so that the die 711 is moved in the device vertically by the mobile device is activated going on.
[0066]
　Pad 712 is disposed in the recess 711a of the die 711. The pad 712 is connected to the pad pressurizing device configured similarly to the pad pressure device 506 of the manufacturing apparatus 500 (not shown). Further, the lower surface of the pad 712 (the surface of the device bottom) is formed in a shape corresponding to the shape of the outer surface of the top plate 122 of the provisional bend parts 120. And, by that pad pressure device is activated, the pad 712 is pressed to the top plate 122 of the device under side of the provisional curved part 120 (punch 713 side), provisional curved parts by a punch 713 and a pad 712, which will be described later 120 the top plate 122 is adapted to be pressurized and nipped in.
[0067]
　Punch 713 is disposed on the device the lower side of the pad 712 is opposed to the device up and down direction as the pad 712. The outer surface of the punch 713, the top plate 702 and the vertical wall 704a of the intermediate curved part 700 has a shape corresponding to the shape of each of the inner surface side of the 704b. Further, in the longitudinal direction on one side of the portion of the punch 713, the pair of flange forming portion 713a is formed integrally with the flange forming portion 713a is protruded from a punch 713 outward in the width direction. Then, the upper surface of the flange forming portion 713a is a flange 706a of the intermediate curved part 700, which is a forming surface corresponding to the shape of the inner surface of 706b.
[0068]
　Holder 714 is disposed adjacent to the outside in the width direction of the punch 713, is disposed adjacent to the other longitudinal side of the punch 713 relative to the flange forming portion 713a. Further, the holder 714 is disposed on the device underside to the longitudinal direction other end portion of the die 711, is disposed opposite the die 711 in the device vertically. Further, the upper surface of the holder 714, the flange 706a of the intermediate curved part 700, which is a forming surface corresponding to the shape of the inner surface of 706b. Then, the holder 714 is connected to the holder pressing device configured similarly to the blank holder pressure device 507 of the manufacturing apparatus 500 (not shown), by the holder pressurizing device is operated, the holder 714 device It is adapted to move up and down direction.
[0069]
　Further, in the inoperative state of the holder pressing device, the holder 714 is arranged on the device bottom side of the flange forming portion 713a of the punch 713. That is, in this state, the upper surface of the flange forming portion 713a of the upper surface and the holder 714 are arranged shifted in the device vertically.
[0070]
　Next, the second step of forming the intermediate curved part 700 referring to manufacturing apparatus 710 with reference to FIGS. 22A-FIG. 22D, and FIGS. 23 to 25. Note that in FIG. 22A ~ FIG 22D, are omitted for convenience shown a provisional bending part 120 (intermediate curved part 700).
[0071]
　First, in the state of the manufacturing apparatus 710 shown in FIG. 22A, the temporary bending part 120 from the device upper side is set to the punch 713, the top plate 122 of the provisional bend part 120 is disposed on the punch 713. As a result, the top plate 122 is supported from the device lower by the punch 713. Next, FIG. 22B, as shown in FIG. 23, and 24, by moving the die 711 and pads 712 to the device bottom (punch 713 side), pressing and the top plate 122 by the pad 712 and the punch 713 nipped.
[0072]
　In this state, by further movement to the die 711 the device bottom (punch 713 side) (falling) as shown in FIG. 22C, the vertical wall in the longitudinal direction on one side of the intermediate curved part 700 704a-1,704b- 1 and to mold the flange 706a-1,706b-1 (bending and stretching process). More specifically, as indicated by two-dot chain line in FIG. 23, with the descent of the die 711, the lower surface in the longitudinal direction on one side of the die 711, in the longitudinal direction on one side of the temporary bending part 120 flange 126a, abuts the upper surface of the 126b (see die 711-1 shown by two-dot chain line in FIG. 23), presses the flange 126a, the 126b to device bottom. As a result, the vertical wall 124a of the provisional curved parts 120, 124b and flange 126a, 129a talweg between 126b, together with 129b is moved to gradually apparatus lower side (direction side that is spaced from the top plate 122), one side in the longitudinal direction of the flange 126a of the provisional curved parts 120, 126b is moved to the device lower side while following the lower surface of the die 711. Then, (see die 711-2 shown by two-dot chain line in FIG. 23) the die 711 when reaching the position of the stroke end, the flange forming portion 713a and the flange 126a, 126b punch 713 of the provisional bend parts 120 are pressurized and nipped by the die 711, the flange 706a-1,706b-1 of intermediate curved part 700 is formed.
[0073]
　According to the above, in the bending and stretching process, in the longitudinal direction on one side of the provisional curved parts 120, talweg 129a, the vertical wall 124a of the provisional curved parts 120 so that the position of 129b is separated from the top plate 122, to 124b an apparatus lower It is bending stretched. As a result, the flange 126a of the provisional curved part 120, part of the 126b is the vertical wall 124a, along with the vertical wall 704a-1,704b-1 of the intermediate curved parts 700 to be part of 124b is formed, intermediate curved flange 706a-1,706b-1 of component 700 is formed (provisional bending part 120 is molded to the shape shown in FIG. 26B from the shape shown in FIG. 26A).
[0074]
　Incidentally, as indicated by two-dot chain line in FIG. 24, when the die 711 reaches the position of the stroke end in the bending and stretching step, a die 711 with respect to the other longitudinal side of the flange 126a, 126b of the provisional bend parts 120 There is spaced apart from the device upper side. That is, in the bend-elongation step, the vertical wall 124a in the longitudinal direction on one side of the temporary bending part 120., 124b only is stretched bending, the vertical wall 124a of the other longitudinal side of the provisional bend parts 120., 124b are not extended bend ( see Fig. 26B).
[0075]
　Then, as shown in FIG. 22D, after the bend-elongation step, it actuates the holder pressurizing device, by moving the holder 714 to the device upper side (elevation), in the other longitudinal side of the intermediate curved part 700 vertical wall molding a 704a-2,704b-2 and flange 706a-2,706b-2 (bending back process). More specifically, as shown in FIG. 24, with the rise of the holder 714, the upper surface of the holder 714, other longitudinal side of the flange 126a of the provisional bend parts 120, in contact with the lower surface of the 126b (FIG. 24 refer to the holder 714-1 represented by the two-dot chain line of), pressing flange 126a, 126b and to the device upside. As a result, the vertical wall 124a of the longitudinal direction the other side of the provisional curved parts 120, 124b and flange 126a, between the 126b talweg 129a, 129b is moved to gradually apparatus upper side (direction side to approach the top plate 122) Rutotomoni, longitudinal direction the other side of the flange 126a of the provisional curved parts 120, 126b is moved to the upper side of a device while following on the top surface of the holder 714. Then, as shown in FIG. 25, when the holder 714 has reached the position of the stroke end, the flange 126a of the provisional bend parts 120 by the holder 714 and the die 711, 126b is pressurized and nipped, intermediate curved part flange 706a-2,706b-2 of 700 is molded.
[0076]
　According to the above, in the unbending process, bending in the longitudinal direction the other side of the provisional curved parts 120, talweg 129a, the vertical wall 124a of the provisional curved parts 120 so that the position of 129b is close to the top plate 122, 124b is in the apparatus upper It is returned. As a result, the vertical wall 124a of the provisional curved part 120, part of the 124b flange 126a, along with the flange 706a-2,706b-2 of intermediate curved parts 700 to be part of 126b is formed, intermediate curved parts vertical walls 704a-2,704b-2 700 is formed (molded into the shape shown in FIG. 19 from the shape shown in FIG. 26B).
[0077]
　Thus, in the second step, the bend-elongation step, by lowering the die 711, the vertical wall 124a in the longitudinal direction on one side of the temporary bending part 120., 124b is extended bent device bottom. Then, in the bending back step after the bending and stretching process, by raising the holder 714, the vertical wall 124a of the longitudinal direction the other side of the provisional curved parts 120, 124b has been bent back to the apparatus upper, intermediate curved part 700 It is molded. Accordingly, the vertical wall 124a of the provisional bend parts 120, the height of 124b is changed by the second step.
[0078]
(Third step)
　Next explained is the third step of restriking the intermediate curved part 700 which is formed by the second step. In the third step, the intermediate curved part 700 spring back occurs and restriking, so as to mold a finished curved part 800 as the "hat-shaped cross-section parts." In the following description, discusses a third shaped by step (process) has been completed curved part 800 initially, and then describes the manufacturing apparatus 820 used in the third step, it will be described subsequently for the third step.
[0079]
(Completed bending the parts 800)
　as shown in FIGS. 27 and 28, completing the bending part 800 is formed in a sectional hat shape elongate. Specifically, the finished bent parts 800, a top plate 802 extending in the longitudinal direction, the pair of first vertical wall extending respectively (thickness direction one side of the top plate 802) downward from the widthwise end of the top plate 802 804a, 804b and the first vertical wall 804a, a pair of lateral wall 806a respectively extending from the distal end of the 804b to the outside in the width direction of the top plate 802, 806b and, lateral wall 806a, the second vertical from the distal end of the 806b of the pair extending respectively to the lower side walls 808a, 808b and a second vertical wall 808a, a pair of flanges respectively extending from the distal end of 808b to the outside in the width direction of the top plate 802 810a, is configured to include and 810b, the. That is, in the finished bent parts 800, transverse direction outer side portion of the top plate 802, a first vertical wall 804a, 804b and transverse wall 806a, is formed in a stepped shape by the 806b.
[0080]
　The first vertical wall 804a of the finished curved part 800, the width dimension of the outer surface W1 (see FIG. 28) at the site of 804b, the width of the outer surface of the intermediate curved part 700 W3 (see FIG. 29A), There has been set to the same size. On the other hand, the second vertical wall 808a, the width W2 of the outer surface at the site of 808b of the finished curved part 800 is set larger than the width W3 of the outer surface of the intermediate curved part 700. That is, in the third step, by restriking the intermediate curved part 700 so as to increase the width W3 at the opening side of the intermediate curved part 700, by molding a finished curved part 800, the dimensional accuracy of the finished bent parts 800 so that the increased.
[0081]
(Manufacturing equipment for 820)
　as shown in Fig. 29A ~ FIG. 29D, manufacturing equipment 820, a list like for die 822 that make up the device the upper portion of the manufacturing equipment 820 (hereinafter, simply referred to as "# 822"), manufacturing restriking punch 826 constituting the apparatus lower part of the device 820 (hereinafter, simply referred to as "punch 826") is configured to include a, a.
[0082]
　The die 822 is formed with shaped recesses 824 which is opened to the device bottom, forming recess 824 is extended along the longitudinal direction of the die 822 corresponds to the longitudinal direction of the intermediate curved part 700. The molded recess 824 includes a first recess 824a constituting part of the top surface side of the molded recess 824 (device upper side), and a second concave portion 824b constituting a portion of the opening side of the forming recess 824 (device bottom), the comprise are configured, the width dimension of the second concave portion 824b is set larger than the width dimension of the first recess 824a.
[0083]
　The first recess 824a is top plate 702 and the vertical wall 704a of the intermediate curved part 700, it is formed in a shape corresponding to the outer surface at the top of 704b. That is, the top surface of the first concave portion 824a is curved in correspondence with the top plate 702 of the intermediate curved part 700, the width dimension of the width of the first recess 824a W4 (see FIG. 29A) is intermediate curved part 700 W3 ( It is substantially the same set as the reference FIG. 29A). Then, although details will be described later, in the third step, while the upper portion of the intermediate curved part 700 (portion of the top plate 702 side) is fitted in the first recess 824a (see FIG. 29B), an intermediate curved part 700 It is adapted to list like the.
[0084]
　The second recess 824b, the lateral walls 806a of the finished curved parts 800, 806b and a second vertical wall 808a, is formed in a shape corresponding to 808b. That is, the inner peripheral surface of the second concave portion 824b is, lateral wall 806a of the finished curved parts 800, 806b and a second vertical wall 808a, there is a forming surface corresponding to the shape of the respective outer surface of 808b. Furthermore, the die 822 is connected to a mobile device configured similarly to the mobile device 509 of the manufacturing apparatus 500 (not shown), that the mobile device is operated, so that the die 822 is moved in the device vertically It is configured.
[0085]
　Punch 826 is arranged in the apparatus below the die 822, it is extended along the longitudinal direction of the die 822. Further, the punch 826, together form a projecting projecting into the molding recess 824 side of the die 822, is opposed to the molded recess 824 device vertically. Then, the outer surface of the punch 826, lateral walls 806a of the finished curved parts 800, 806b and a second vertical wall 808a, there is a forming surface corresponding to the shape of each of the inner surface of 808b.
[0086]
　In addition, the punch 826, in the width direction central portion, and the support member 828 is provided for supporting the top plate 702 of the intermediate curved parts 700, support member 828 is continuous over the top plate 702 in the longitudinal direction It is extended along the longitudinal direction of the punch 826 so as to support the. The support member 828 is disposed in the apparatus below the molding recess 824 of the die 822, which is extendable constructed from punch 826 to the device upper side. Specifically, the support member 828, for example a gas cushion, a hydraulic device, a spring, a support member a pressure device, such as an electric drive unit is connected to (not shown), by the support member pressing device is actuated, supporting member 828 is adapted to be extended from the punch 826 to the device upper side.
[0087]
　The support member 828 is formed in a substantially T-shape when viewed from the longitudinal direction. In other words, the upper portion of the support member 828, Zhang out portions are formed outward in the width direction. The upper support member 828 is a support portion 828a. Further, in the inoperative state of the support member pressing unit, the support portion 828a is positioned adjacent to the device upper side of the punch 826. Further, the support portion 828a may, top plate 702 and the pair of vertical wall 704a of the intermediate curved part 700, is formed in a shape corresponding to the inner surface side of the top of 704b. That is, the upper surface of the support portion 828a has curved in correspondence with the top plate 702, the width dimension of the supporting portion 828a is set substantially the width of the inner surface side of the intermediate curved part 700 the same. Then, although details will be described later, in the third step, the support portion 828a in the first recess 824a of the molding recess 824 of the die 822 is adapted to be fitted together with the intermediate curved part 700 (see FIG. 29B). Therefore, the height dimension of the supporting portion 828a has, as compared with the depth of the first recess 824a, is set smaller by the thickness dimension of the top plate 802 min.
[0088]
　Next, a description will be given of the third step of the list like the intermediate curved part 700 by the manufacturing device 820.
[0089]
　First, to actuate the support member pressure device the support member 828 to extend from the punch 826 to the device upper side. In this state, by setting the intermediate curved part 700 from the device upper side supporting portion 828a of the support member 828, thereby placing the top plate 702 of the intermediate curved part 700 on the upper surface of the support portion 828a (see FIG. 29A). As a result, the whole of the top plate 702 of the intermediate curved part 700 is supported from the device lower side by the support member 828 (support process). In this state, since the width dimension of the supporting portion 828a is set substantially the width of the inner surface side of the intermediate curved part 700 the same, the both widthwise end portions of the supporting portion 828a of intermediate curved part 700 vertical wall 704a, in contact with the 704b, movement in the width direction of the intermediate curved part 700 is limited relative to the support member 828. In this state, the vertical wall of the intermediate curved part 700 704a, so that the tip portion of the 704b will not contact the punches 826, extension length of the support member 828 is suitably set to be extended from the punch 826.
[0090]
　Then, by operating the moving device to move the die 822 to the device bottom (punch 826 side). Accordingly, the supporting member 828 together with the intermediate curved part 700, is moved relative device upward relative to the die 822, it is inserted into the molding recess 824 of the die 822. Then, as shown in FIG. 29B, the die 822 is lowered to a predetermined position, the upper and the support portion 828a of the intermediate curved part 700 is fitted into the first recess 824a of the die 822 (positioning step). In this state, since the width dimension W4 of the first concave portion 824a is substantially the same set as the width dimension W3 of the intermediate curved part 700, moving in the width direction of the intermediate curved part 700 is limited by the first recess 824a . Thus, with the intermediate curved part 700 is positioned in the widthwise direction by the first concave portion 824a in the longitudinal direction of each portion of the intermediate curved part 700, pressing the top plate 702 of the intermediate curved part 700 by the support portion 828a and the die 822 and it is held.
[0091]
　Then, as shown in FIG. 29C, the top plate 702 of the intermediate curved part 700 further moves the die 822 to the device lower in sandwiched state by the support portion 828a and the die 822. Thus, the punch 826, is moved relative device upward relative to the die 822, it is inserted into the molding recess 824 of the die 822. And, the second vertical wall 808a of the finished curved parts 800, 808b is molded by the punch 826 and die 822. The second vertical wall 808a of the finished bent parts 800 by the punch 826 and die 822, at the time of molding the 808b, the flange 706a of the intermediate curved part 700, 706b is released. Then, the flange 706a of the intermediate curved part 700, and a state where 706b is released, the second vertical wall 808a, the flange 706a at the time of molding the 808b, 706b are, and the die 822 and the punch 826 (or holder, etc.) It refers to a state which is not pressurized and nipped. As will be described later, at the time of completion of molding to the intermediate curved part 700, the flange 706a, 706b may be pressurized and nipped by the punch 826 and die 822.
[0092]
　Furthermore, as shown in FIG. 29D, the die 822 reaches the position of the stroke end, lateral wall 806a of the finished bent parts 800 by a punch 826 and the die 822, 806b and flange 810a, 810b are molded (restriking step ). Thus, the finished curved part 800 so as to widen the intermediate curved part 700 in the width dimension outwardly is molded.
[0093]
　Incidentally, in the manufacturing apparatus 820 of the aforementioned third step, a die 822 are relatively moved to the punch 826 and the support member 828 side and the intermediate curved part 700 are restrike, the configuration of the manufacturing apparatus 820 is limited to the Absent. For example, the punch 826 and the support member 828 are relatively moved to the die 822 side, an intermediate curved part 700 may be restriking. In this case, it may be arranged by inverting the positional relationship between the punch 826 and the support member 828 and die 822 in the device vertically. That is, the punch 826 and the support member 828 may be configured to be disposed in the apparatus an upper relative die 822.
[0094]
　Further, the manufacturing apparatus 820 may be configured as in the modified examples shown below.
(Modification 1 of the production apparatus 820)
　as shown in FIGS. 30A ~ FIG 30D, in the modified example 1, the support member 828 of the manufacturing apparatus 820, is extended in the device vertically when viewed from the longitudinal direction of the punch 826 cage, the support portion 828a of the support member 828 is not issued Zhang outward in the width direction. For this reason, as shown in FIG. 30A, at the time to support the top plate 702 of the intermediate curved part 700 from the device the lower side by the support member 828, configured to support portion 828a supports the width direction central portion of the top plate 702 It is. Then, by moving the die 822 to the punch 826 side, the top plate 702 of the intermediate curved part 700 is fitted into the first recess 824a of the die 822 (see FIG. 30B). Moreover, by further moving the die 822 to the punch 826 side, intermediate curved part 700 is restriking by the die 822 and the punch 826 (see FIGS. 30C and FIG. 30D).
[0095]
(Modification of the manufacturing apparatus 820 2)
　, as shown in FIGS. 31A ~ FIG 31D, in the second modification, the top surface of the first concave portion 824a of the die 822, the opened housing recess 830 is formed to the device bottom ing. Furthermore, the die 822 has restriking pad 832 is provided constituting a part of the die 822, restriking pad 832, the pad pressing constructed similarly to the pad pressure device 506 of the first step It is connected to a pressure device (not shown). Then, in the inoperative state of the pad pressure device, restriking pad 832 is received in the receiving recess 830. On the other hand, if the pad pressure device is actuated, restriking pad 832, it is extended from the die 822 to the device bottom, so as to press the outer surface of the top plate 702 of the intermediate curved part 700.
[0096]
　Then, as shown in FIG. 31A, when by the support member 828 for supporting the top plate 702 of the intermediate curved parts 700, became the top plate 702 so as to pressure and sandwiched by a list-like pad 832 and the support member 828 ing. Therefore, relative movement of the device the upper with respect to the supporting member 828 of the intermediate curved part 700 is limited by restriking pad 832. Then, by moving the die 822 to the punch 826 side, with a list-like pad 832 is received in the receiving recess 830, the narrow top plate 702 of the intermediate curved part 700 by restriking pad 832 and the support member 828 equity It is while fitted into the first recess 824a of the die 822 (see FIG. 31B). Thus, in the second modification, while favorably maintaining the supporting state for the intermediate curved part 700 by the support member 828, which is an intermediate curved part 700 so as to fit within the first recess 824a. Then, by further moving the die 822 to the punch 826 side, intermediate curved part 700 is restriking by the die 822 and the punch 826 (see FIGS. 31C and FIG. 31D).
[0097]
　Incidentally, in the second modification, as described above, while holding the top plate 702 of the intermediate curved part 700 by restriking pad 832 and the support member 828, fitting the upper portion of the intermediate curved part 700 inside the first recess 824a It is configured to writing. Accordingly, apparatus which load is set low to the lower side of the restriking pad 832 relative to the load on the device upper support member 828, moves to an apparatus underside of the die 822, restrike use pad 832 is adapted to move relative to shrink to die 822. Further, as shown in FIGS. 32A ~ FIG 32D, even in the modified example 2, may be the same shape as the supporting member 828 form a first modification of the support member 828. In other words, it may be sandwiched between the top plate 702 of the intermediate curved part 700 by the support member 828 and a list-like pad 832 while supporting the width direction central portion of the top plate 702 from the device lower side by the support member 828.
[0098]
(Function and effect of this embodiment of the invention, the preferred values of various parameters, etc.)
　Next, a description will be given of a preferred value, and the like of the operation and effects and various parameters of the present embodiment.
[0099]
　As described above, the portion in the first step of the present embodiment, the vertical wall 501a of the provisional bend parts 501 by the manufacturing apparatus 500, while going to form 501b, which is molded into the top plate 501c of the material metal sheet 601, It is pressurized and held between the pad 503 and the punch 504. Therefore, if is sufficient pressure, a portion formed in the top plate 501c in the material metal sheet 601 can not be deformed in the thickness direction in the molding process, it is possible to suppress the occurrence of wrinkles in the portion . The flange 501d of the material metal sheet 601, since it is pressurized and nipped by partial also the blank holder 505 and the die 502 to be molded to 501e, if is sufficient pressure, the flange 501d in the material metal sheet 601, portion formed on 501e can not be deformed in the thickness direction, it is possible to suppress the occurrence of wrinkles in the portion.
[0100]
　However, in the case where the pressing force is insufficient can not prevent deformation in the thickness direction of the material metal sheet 601, the portion and the flange 501d, which are molded on the top plate 501c of the material metal sheet 601 is shaped to 501e that wrinkle is generated in the part. Thickness commonly used in the structural member which forms the automobile body of the skeleton (e.g. front side member) is below the above 0.8 mm 3.2 mm, further the tensile strength is the 1600MPa less steel than 200 MPa, FIGS. 5 to in the case of molding by the hat-shaped cross-section parts of the manufacturing apparatus 500 shown in 6D, it is desirable the pressing pressure is 0.1MPa or higher.
[0101]
　Figure 33A is a vertical wall 501a of the provisional bend parts 501, there is shown a stress generated in 501b. Further, in FIGS. 33B and FIG. 33C is a vertical wall 501a of the provisional bend parts 501, resulting in 501b, shear wrinkle W is shown.
[0102]
　As shown in FIG. 33A, the vertical wall 501a of the provisional bend parts 501, when molding the 501b, the vertical wall 501a of the material metal sheet 601, the portion to be molded to 501b, be accompanied by a deformation mainly comprising shear deformation It is seen. Vertical wall 501a of with modification mainly comprising shear deformation provisional curved part 501, by molding 501b, the vertical wall 501a, that thickness of 501b is reduced compared to the plate thickness of the material metal sheet 601 It is suppressed. Thus, it is possible to prevent the wrinkles and cracks are generated vertical wall 501a, the 501b.
[0103]
　In addition, and as it shaped vertical wall 501a, the 501b, the part to be molded vertical wall 501a, 501b in the material metal plate 601, the compressive deformation to minimum principal strain direction of shear deformation. Accordingly, the clearance between the die 602 and the punch 604 is increased, as shown in FIGS. 33B and FIG. 33C, the vertical wall 501a of the provisional bend parts 501, in 501b, shear wrinkle W occurs. In order to suppress this shear wrinkle W while the vertical wall 501a, the molding of the 501b are formed, by reducing the clearance between the die 602 and the punch 604, close the clearance plate thickness of the material metal sheet 601 it is effective.
[0104]
　As shown in FIGS. 34A ~ FIG 34D, the vertical wall 501a, the θ interior angle formed between 501b and the top plate 501c, but may be set to 90 ° or more so as not to negatively angle of the mold during molding, from 90 ° since forming the initial clearance and too large increases, it is advantageous angle closer to 90 ° at 90 ° or more. Also, in the structural member which forms the automobile body of the skeleton it is commonly used, thickness: 0.8 mm or more 3.2mm or less, tensile strength: 200 MPa or more 1600MPa or less of the vertical wall in the steel plate 501a, the height of 501b is 200mm when molding the following parts, the top plate 501c and the vertical wall 501a, it is desirable internal angle formed by the 501b is 90 ° or more and 92 ° or less, the vertical wall 501a, at the time of molding has been completed 501b, vertical walls 501a, the clearance b between the die 502 and the punch 504 at a portion to be formed 501b is desirably not more than 120% to 100% more than the thickness of the material metal sheet 601.
[0105]
　Then, (1) the vertical wall 501a, the angle between 501b and the top plate 501c, (2) (changing the thickness t for a constant clearance b) the mold clearance, the pressure to be applied to (3) Pad 503 (pad pressure), (4) pressure to be applied to the blank holder 505 (holder pressure), (5) the tensile strength of the material, as a parameter, the verification result of the presence or absence of occurrence of wrinkles occurring in the provisional curve component 501 in FIG. 35 It will be described with reference to the table shown.
[0106]
　Further, FIG. 36A is a perspective view showing a temporary bending part 501, FIG. 36B is a plan view of the temporary bending part 501 in FIG. 36A from above, FIG. 36C, the temporary bending part 501 in FIG. 36A is a side view, FIG. 36D is a sectional view showing a section of temporary bending part 501 taken along the line D-D shown in FIG. 36C. Further, FIG 37 is a cross-sectional view of a mold.
[0107]
　Then, the angle .theta in the table shown in FIG. 35, as shown in FIG. 36 D, a vertical wall 501a, an interior angle formed between 501b and the top plate 501c .theta. Moreover, the gap between the clearance b is in the table shown in FIG. 35, as shown in FIG. 37, between the pad 503 and the punch 504, between the die 502 and the punch 504, the die 502 and the blank holder 505 it is.
[0108]
　Both Examples 1 to 19 in the table shown in FIG. 35 is an example molded in the first step of the present embodiment, attached circled in Table as "wrinkling" is tooth acceptable degree It indicates that my generation, given the "no occurrence" is a double circle, which shows that there is no occurrence of wrinkles. In addition, (1) No. 1-5 the vertical wall 501a, a case of changing an angle between 501b and the top plate 501c, (2) No. 6-9 mold clearance, more specifically a case of changing the thickness t for a constant clearance b, (3) No. 10-13 are examples of changing the pressure (pad pressure) applied to the pad 503, (4) No. 14-16 are examples of changing the pressure applied to the blank holder 505 (holder pressure), (5) No. 17-19 are examples of changing the tensile strength of the material. It was verified the presence or absence of the occurrence of wrinkles in each curved parts manufactured in Example.
[0109]
　As shown in the above Table, in the range of verified parameters, it can be seen that wrinkles unacceptable as a product does not occur in the provisional curve part 501. Thus, according to the first step of the present embodiment, it is possible to satisfactorily mold the provisional bending part 501.
[0110]
　In the third step of this embodiment, the finished curved part 800 of the intermediate curved part 700 to restrike it is molded by the manufacturing apparatus 820. Then, the manufacturing apparatus 820, a support member 828 which is extended from the punch 826 to the device upper side is provided with an inner surface of the top plate 702 of the intermediate curved part 700 is supported by the support member 828. Thus, when setting the intermediate curved part 700 caused springback in the manufacturing apparatus 820 (support member 828), since the intermediate curved part 700 is placed in the apparatus the upper with respect to the punch 826, the vertical intermediate curved part 700 wall 704a, 704b can be prevented from hitting the punch 826. As a result, for example, it can be suppressed that the vertical wall of the intermediate curved parts 700 704a, intermediate curved part 700 in a state that 704b was riding on the shoulder portion of the punch 826 is set to the manufacturing apparatus 820. Therefore, (in the normal posture) the intermediate curved part 700 to a normal position with respect to the manufacturing device 820 when the list like the intermediate curved part 700 can be arranged.
[0111]
　Moreover, the first recess 824a width W4 of the die 822, are substantially the same as setting the width dimension W3 of the intermediate curved part 700. Therefore, in the third step, when holding the top plate 702 of the intermediate curved part 700 by the die 822 and the support member 828, the upper portion of the intermediate curved part 700 is fitted inside the first recess 824a of the die 822. Thus, a pair of vertical walls 704a of the intermediate curved part 700, intermediate curved part 700 by the 704b and the first concave portion 824a is positioned in the width direction. That is, the less the vertical walls 704a affected by the spring back, by the portion and the first concave portion 824a on the base end side of the 704b (top panel 702 side), position relative to the die 822 of the intermediate curved part 700 is determined. Therefore, the position to the die 822 of the intermediate curved part 700 can be stabilized at the time of restriking molding.
[0112]
　In the third step, a second vertical wall 808a of the finished bent parts 800 by the punch 826 and die 822, at the time of molding the 808b, the flange 706a of the intermediate curved part 700, 706b is released. Therefore, in the manufacturing apparatus 820, the flange 706a of the intermediate curved part 700, is necessary to provide a holder for pressing the 706b disappears. Thus, it is possible to make the manufacturing apparatus 820 in a simple structure.
[0113]
　Further, in the third step of the manufacturing apparatus 820, the width dimension of the supporting portion 828a is set substantially the width of the inner surface side of the intermediate curved part 700 the same support member 828. For this reason, at the time to support the top plate 702 of the intermediate curved part 700 by the support portion 828a, both widthwise ends of the support portion 828a is a vertical wall of the intermediate curved parts 700 704a, it is brought into contact with 704b. Accordingly, while limiting the movement in the width direction of the intermediate curved part 700 to the support member 828 can be fitted into the upper portion of the intermediate curved part 700 to the first concave portion 824a of the die 822.
[0114]
　In addition, in the second step, in the bending and stretching process, by lowering the die 711, of the provisional curved parts 120 longitudinal direction on one side of the vertical wall 124a, 124b is stretched bending to a device under side, of the intermediate curved part 700 vertical wall 704a-1,704b-1 is molded. Then, in the bending back step after the bending and stretching process, by raising the holder 714, of the provisional curved parts 120 longitudinal direction the other side of the vertical wall 124a, 124b have been bent back to a device the upper side, of the intermediate curved part 700 vertical wall 704a-2,704b-2 is molded. This makes it possible to change the vertical wall of the intermediate curved part 700 704a, the vertical wall 124a of the provisional bend parts 120 while suppressing the occurrence of cracks and wrinkles in 704b, the height of 124b.
[0115]
　Hereinafter, this point, a step back bending bending and stretching step will be described in comparison with comparative examples that occur simultaneously. In this comparative example, since the step back bending bending and stretching steps are carried out simultaneously, lowered simultaneously with the holder 714 of the die 711 of the manufacturing apparatus 710 is increased. Therefore, as shown in FIG. 20, the longitudinally intermediate portion of the vertical wall of the intermediate curved part 700 704a (704b) (specifically, be a boundary portion between the vertical wall 704a-1 and the vertical wall 704a-2 , there is a possibility that cracking occurs at the site) surrounded by a two-dot chain line C in FIG. 20. That is, in the longitudinally intermediate portion of the vertical wall 704a (704b), well as bending stretched device lower in the longitudinal direction on one side, back bending device upper side in the other longitudinal side. For this reason, in the longitudinal direction intermediate portion of the vertical wall 704a (704b), and back bending and bending and stretching deformation of the vertical wall 704a (704b) in the reverse direction is carried out at the same time. Thus, there is a possibility to occur a crack in the longitudinally intermediate portion of the vertical wall 704a (704b).
[0116]
　On the other hand, in the second step of the present embodiment, the step back bending after the bending and stretching process is performed. Thus, in the longitudinally intermediate portion of the vertical wall 704a (704b), and a return bend with the bending and stretching to deform vertical wall 704a and (704b) in the opposite direction it is prevented from being performed simultaneously. Accordingly, it is possible to suppress the cracking occurs in the longitudinally intermediate portion of the vertical wall 704a (704b). In particular, as described above, in the first step of forming a vertical wall 124a, temporary curved parts 120 parts by shear deformation corresponding to 124b of the provisional bend parts 120 in the material metal plate 601, the vertical wall 124a, the 124b High is formed in a substantially uniform in the longitudinal direction of the provisional bending part 120 is dimension. Thus, the hat-shaped cross-section parts of various specifications, even if the height of the hat-shaped cross section parts are different in the longitudinal direction, by forming the intermediate curved part 700 by the second step, effectively with respect to the various specifications it is possible to cope with.
[0117]
　Further, in the second step, since the step bent back after the bend-elongation step is performed, as compared with the case of performing the step stretch bending after unbending step, the occurrence of cracks and wrinkles in the longitudinal direction intermediate portion of the intermediate curved part 700 it can be suppressed. That is, when performing the bending back step earlier, with the movement of the upper flange 706a-2, a boundary portion between the flange 706a-1 and the flange 706a-2 comes to be pulling upward. Then, when a step stretch bending in this state, since the boundary portion between the flange 706a-1 and the flange 706a-2 that is pulled upward are extended bend, the boundary portion between the flange 706a-1 and the flange 706a-2 there is a possibility that a crack or the like occurs.
[0118]
　In contrast, when the bending and stretching step ahead, the material of the flange 706a-2 acts to converge the boundary side of the flange 706a-1 and the flange 706a-2. Then, when the unbending process in this state, to draw material collected on the boundary side, the flange 706a-2 is moved to the upper side. As a result, it is possible to suppress that the cracks or wrinkles or the like in the boundary portion between the flange 706a-1 and the flange 706a-2 is generated. In particular, the intermediate curved part 700, the flange 706a corresponds to the convex curved portion 702a, since 706b is bent in side view, the cracks and wrinkles for easily occurs near the bent portion of the cracking and wrinkling while suppressing generation, it is possible to change the height of the intermediate curved part 700.
[0119]
　In the present embodiment, by forming the provisional bend part by the first step to change the height of the provisional bend part by the second step, restriking molded provisional curved parts through the second step by the third step finished bending parts are molded. In contrast, by omitting the second step may be molded finished curved parts and restriking shaped by the temporary curvature part molded by the first step third step. That is, when the height dimension of the finished bent parts by various specifications of the finished bent parts is constant in the longitudinal direction, there is no need to apply a second step the temporary curved part, in such a case, the second step it can be omitted. More specifically, as shown in FIG. 38, the finished bent parts provisionally curved part 120 which is formed by the first step by restriking molded by the third step, the height is constant in the longitudinal direction 800 It is molded.
[0120]
　In order to enhance the positioning accuracy of the curved part with respect to the die and the punch in the second step and the third step of this embodiment may be provided positioning pins on the punch and the support member. For example, referring to the third step, provided with a positioning pin that protrudes in the apparatus upper side supporting portion 828a of the support member 828, a positioning hole in which the positioning pin is inserted into the top plate 702 of the intermediate curved part 700 it may be formed. In this case, for example, in the previous step of the first step, thereby forming a positioning hole by applying a pre-processed material metal sheet, the die 822, previously formed recesses to avoid interference with the positioning pins .
[0121]
　In order to increase the longitudinal positioning accuracy of the intermediate curved part 700 to the die 822 and the punch 826, for example guide pins and the vertical wall 704a is brought into contact with both longitudinal ends of the top plate 702, both ends in the longitudinal direction of the 704b skilled the contact is being guide wall may be provided on the support member 828.
[0122]
　Also, in the manufacturing device 820 used in the third step of the present embodiment, as the support member 828 is continuously support across the top plate 702 of the intermediate curved part 700 in the longitudinal direction, length of the intermediate curved part 700 Although extending in the direction, may be configured to intermittently supported by the support member 828 and top plate 702 of the intermediate curved part 700 divides the support member 828. For example, it may be configured to support the both longitudinal ends and a longitudinally intermediate portion of the support member 828 of the top plate 702.
[0123]
　Further, in the manufacturing apparatus 820 used in the third step of the present embodiment, the molding recess 824 formed in the die 822 is configured to include a first recess 824a and second recess 824b. That is, forming the recess 824 is configured with two recesses. Alternatively, it may be configured molding recess 824 by three or more recesses. For example, the opening side of the second concave portion 824b, may be formed larger third recess width dimension than the second recess 824b. In this case, the outer shape of the punch 826 is changed appropriately in correspondence with the molding recess 824.
[0124]
　Having thus described exemplary embodiments of the present invention, the present invention is not limited to the above, it within the scope not departing from the spirit and can be implemented in various modifications other than the above are as a matter of course.
[0125]
　Also, the disclosure of 2013 December 26, Japanese Patent Application No. 2013-269854, filed on, the entirety of which is incorporated herein by reference.
[0126]
(Note)
　method for producing a hat-shaped cross section part according to the first embodiment is to place the temporary molded article forming a hat-shaped cross-section between the restrike punch and restrike die disposed so as to face each other, and support a process that supports the top plate of the temporary molded article by a support member that is extended to the list like for the die-side from the list like a punch from the list like punch side, formed in the list like for the die and the by accommodating the top plate to the inside of the first recess which forms the upper face side of the open molded recess to list like punch side to the support member and the list-like die while holding the top plate a positioning step for positioning the temporary molded article in the width direction said pair of vertical walls extending from opposite widthwise ends of the top plate in the temporary molded product by a first concave portion, and constitutes the opening side of the forming recess said was inserted restriking punch inside the second recess width dimension than the first recess is set larger, and restriking the temporary molded product and the restriking punch by the said restrike die list includes a like process, the.
[0127]
　Further, in the restriking step, the state in which a flange constituting the both widthwise end portions of the preformed article is released, the temporary molded product is restriking by the said restrike die and the restriking punch it is preferred.
[0128]
　In addition, in the positioning process, the heavens of the list-like pads that make up the part of the list like die arranged so as to extend to the list like punch side, it said is supported by the support member was the provisional molded article plates and while sandwiched by the said support member and the restriking pad, be accommodated inside the first recess are preferred.
[0129]
　Further, it is preferable that with the support member which is brought into contact with the pair of the vertical wall in the temporary molded products.
[0130]
　Further, the an intermediate step of changing the height of the vertical wall of the provisional formed article prior to restriking the temporary molded article, in the intermediate step, said by the intermediate forming punch and the intermediate molded pads preformed article of the top plate sandwiched, opposed to the intermediate molding die the intermediate said to molding punch side are relatively moved by the intermediate molding die provisional molded article in the longitudinal direction on one side said the vertical wall the top plate of bending and stretching to the side said, after stretching bending the vertical wall, by the intermediate molding holder, which is provided on both sides in the width direction of the intermediate molding punch moved relative to the intermediate molding die side said intermediate molded holder it is preferable that the return bending the vertical wall in the longitudinal direction the other side of the temporary molded products to the top plate side.
[0131]
　Further, the temporary molded product, is a curved member having a curved portion which is convex to the outer surface or the inner surface of the top plate in side view, with the temporary molding process for molding the temporary molded product, for preformed and a metal plate curved in a vertically sandwiching the central portion of the metal plate is punched and preformed pad, wherein the temporary molding holder provided on both sides in the width direction of the provisional molding punch, the temporary molding die, by sandwiched between the both side portions of the metal plate, said that the relatively moving provisional molding punch and and the temporary molding pad and the said provisional molding holder and the provisional molding die up and down, the hat-shaped cross-section parts be molded is preferred.
[0132]
　Further, the temporary molded product, together with the plate thickness is 0.8 ~ 3.2 mm, it is preferred that the tensile strength are composed of steel plate 200 ~ 1600 MPa.
[0133]
　Method for producing a hat-shaped cross section part according to the second aspect, die and, using a press-forming apparatus comprising a punch which is disposed opposite to the die, a top plate elongated Both ends of the top plate and two longitudinal walls extending in a direction substantially perpendicular to the top plate connected to parts, next to the formed hat by two outward flange leading to each of the two vertical walls
and having a cross-sectional shape, the top the top plate in the longitudinal direction of the part of the plate, both the two vertical walls and the two outward flange is an intermediate molded article comprising a body having an outer shape which is curved in an arc shape in the height direction of the longitudinal wall curved parts, by performing press molding, a method of producing a curved part which is a finished product, to set the curved part is an intermediate molded article in the punch, in the intermediate molded article which rides on the punch while supporting the inner surface of the top plate of a curved part, performing the press forming by contacting the die curved part is an intermediate molded article.
[0134]
　Also, the portion which is supported an inner surface of the top plate is preferably a longitudinal or some or all of the width direction of the inner surface of the top plate.
The scope of the claims
[Claim 1]
　Support member to place the temporary molded article forming a hat-shaped cross-section, is extended from the list like a punch to the list like for the die-side between the opposing list like punch which is arranged and a list-like die support process and, to support the top plate of the temporary molded article from the punch side for the list-like by
　configuring the top surface side of the formed on the list like die and open molded recess to the list like punch side together to accommodate the top plate into the first recess and holding the top plate by the said restrike die and the support member, a pair of longitudinal extending from both widthwise ends of the top plate of the temporary molded product a positioning step of positioning the temporary molded article in the width direction by the wall and the first recess,
　the inside of the second recess width that is greater than and the first concave portion constitutes the opening side of the forming recess is larger the list like for and was inserted into the punch, the list and the list-like process that lists like the temporary molded products like punch and by the said list-like die, the
　method for producing a hat-shaped cross-section parts with a.
[Claim 2]
　In the restriking step claim wherein in a state where a flange constituting the both widthwise end portions of the preformed article is released, said preformed article is restriking by the said restrike die and the restriking punch hat-shaped cross-section parts method of manufacturing described in 1.
[Claim 3]
　In the positioning step, the restriking pad forming part of the restrike die disposed so as to extend to the restriking punch side, a top plate supported by said preliminarily molded article by the support member while sandwiched between the restriking pad by the said support member, hat-shaped cross-section components the method of manufacture according to claim 1 or claim 2 is accommodated inside the first recess.
[Claim 4]
　The one hat-shaped cross-section components the method of preparation according to one of the support claims that members are used 1 to claim 3 is brought into contact with the pair of the vertical wall in the temporary molded products.
[Claim 5]
　An intermediate step of changing the height of the vertical wall of the provisional molded article before listing like the temporary molded article,
　said in an intermediate step,
　the temporary molded products by the middle forming punch and the pad for intermediate molded sandwiched the top plate, the side opposite to the said vertical wall of said by the intermediate molding die with the intermediate molding die are moved relative to the intermediate molding punch side tentative molded article longitudinal direction on one side of the top plate to bending and stretching,
　said after stretching bending the vertical wall, said by the intermediate molding holder, which is provided on both sides in the width direction of the intermediate molding punch moved relative to the intermediate molding die side said intermediate molded holder provisional other longitudinal side hat-shaped cross-section components the method of manufacture according to the longitudinal wall in any one of claims 1 to 4, bent back to the top plate side of the molded article.
[6.]
　The preformed article is a curved member having a curved portion which is convex to the outer surface or the inner surface of the top plate in side view,
　with the temporary molding process for molding the temporary molded product,
　and the provisional shaping punch in the preformed pads to sandwich the center portion of the metal plate and a metal plate curved in the vertical,
　said a provisional formed holder provided on both sides in the width direction of the provisional molding punch, the temporary molding die, by sandwiching the both side portions of the metal plate,
　by relatively moving said provisional shaping holder and the provisional shaping punch and the preformed pad and a provisional molding die up and down, according to molding the temporary molded product hat-shaped cross-section components the method of manufacture according to any one of claim 1 to claim 5.
[7.]
　The preformed article, hat described in conjunction with the plate thickness is 0.8 ~ 3.2 mm, in any one of the tensile claims strength are composed of steel plate 200 ~ 1600MPa 1 ~ claim 6 method of manufacturing a form cross-section parts.