JP4415604B2 - Manufacturing method of differential thickness plate material and manufacturing apparatus of differential thickness plate material - Google Patents

Description

  The present invention relates to a method for manufacturing a differential thickness plate material and an apparatus for manufacturing the differential thickness plate material.

  In order to save material and reduce the weight of parts, a differential thickness plate material in which a thin portion is partially formed is widely used. The differential thickness plate material is a part that constitutes a part that requires a relatively strong strength among the parts of a part as a thick part, while a part that constitutes a part that does not require a strong strength as a thin part. is there.

  Conventionally, when manufacturing a differential thickness plate material, a technique of rotating a rolling roll to partially form a thin portion has been adopted (see, for example, Patent Document 1 and Patent Document 2).

However, the equipment provided with the rolling roll is relatively large, and the processing time is relatively long. For this reason, there is a problem that the processing fee becomes expensive.
JP 2002-239605 A JP 2002-248503 A

  The present invention has been made in order to solve the problems associated with the above-described prior art, and can easily form a differential thickness plate material, thereby suppressing an increase in processing cost. It is another object of the present invention to provide an apparatus for manufacturing a differential plate material.

  The present invention for achieving the above object is achieved by the following means.

The present invention is a method of manufacturing a differential thickness plate by partially forming a thin-walled portion with a thin thickness compared to other parts in a plate-shaped blank material,
A first pressing step of extending the target region to be the thin-walled portion of the blank material into a cross-sectional corrugated shape by a first press working device having a corrugated press surface;
A second pressing step of returning the target area formed into a corrugated cross-section to an original flat plate shape by a second press working apparatus having a flat cross-section press surface. It is a manufacturing method of a thick board material.

Further, the present invention is a device for manufacturing a differential thickness plate material by partially forming a thin-walled portion with a thin thickness compared to other parts in a plate-shaped blank material,
In order to extend the target region to be the thin-walled portion of the blank material into a cross-sectional corrugated shape, the first press working device provided with a press surface having a corrugated cross-section,
A second press working apparatus having a flat cross-section press surface to return the target area formed into a corrugated cross-section to the original flat plate shape. It is a manufacturing device.

  According to the present invention, the differential thickness plate material can be formed by using a relatively simple facility such as press working, and the working time is shortened as compared with the rolling process. Therefore, it is possible to easily form the differential thickness plate material, and it is possible to suppress an increase in processing cost.

  Embodiments of the present invention will be described below with reference to the drawings.

(First embodiment)
FIGS. 1A to 1C are diagrams showing steps of a method for manufacturing a differential thickness plate W according to the first embodiment of the present invention, and FIGS. 2A to 2C are manufactured differential thicknesses. It is a figure which shows the process of manufacturing components from the board | plate material W. FIG. FIG. 3 shows a first press working apparatus which is provided in the apparatus for manufacturing the differential thickness plate material W according to the first embodiment of the present invention and performs the first pressing step shown in FIG. 1 (B). FIGS. 4 (A) and 4 (B) are schematic structural views showing the second embodiment shown in FIG. 1 (C), which is provided in the apparatus for manufacturing the differential thickness plate material W according to the first embodiment of the present invention. It is a schematic block diagram which shows the 2nd press work apparatus 40 which implements a press process.

  As a part to reduce the weight by applying the differential thickness plate material W, in an automobile part, for example, a suspension member which is one of suspension constituent parts can be cited. FIG. 2 shows an outline of a process for manufacturing the front extension, differential, mount, and lower parts of the suspension member. Briefly, the manufactured differential thickness plate material W is pierced (FIG. 2 (A)), pressed into a part shape (FIG. 2 (B)), and cam flat processing is performed on the portion indicated by reference numeral 11. Application (FIG. 2C), the front extension, differential, mount, and lower part 10 are manufactured. The present invention is applied when manufacturing the differential thickness plate W.

  Referring to FIGS. 1A to 1C, the manufacturing method of the differential thickness plate material W will be summarized as follows: a thin portion 21 having a thin thickness compared to other portions is partially formed on the plate-like blank material 20. In the method of manufacturing the differential thickness plate material W, the target region 22 to be the thin portion 21 of the blank material 20 is formed into a cross-sectional waveform by the first press working device 30 having a press surface having a cross-sectional waveform. A target region formed into a corrugated cross section by a first press step (see FIGS. 1A and 1B) that is extended and stretched and a second press working apparatus 40 having a flat cross section press surface. And a second pressing step (see FIG. 1C) for returning 22 to the original flat plate shape. Although the material and thickness of the blank material 20 are not specifically limited, For example, it is an aluminum plate (for example, A5154), The thickness is 4.5 mm, for example. In the example of illustration, the object area | region 22 used as the thin part 21 is the approximate center part of the blank material 20, and the left-right both sides in the figure of the object area | region 22 become the non-object area | region 23 which is not thinned.

  In each of FIGS. 1B and 1C, a plan view and a cross-sectional view of the plate members 26 and W are shown. As shown in FIG. 1 (B), there are both peak apex 24 and trough apex 25 as apexes of the cross-sectional waveform. The vertex 25 is marked with a broken line. Furthermore, in the cross-sectional view of FIG. 1C, the degree of difference thickness is exaggerated for easy understanding.

  With reference to FIGS. 3 and 4, the manufacturing apparatus of the differential thickness plate material W that embodies the above manufacturing method will be summarized as follows. The thin blank portion 20 is thinner in the plate-shaped blank material 20 than other portions. 21 is a device for producing a differential thickness plate material W by partially forming 21, and in order to extend the target region 22 to be the thin-walled portion 21 of the blank material 20 by extending the cross-sectional waveform into a cross-sectional waveform, In order to return the first press working apparatus 30 (see FIG. 3) having the press surface of FIG. 3 and the target region 22 formed into a corrugated cross section to the original flat plate shape, the press surface having a flat cross section was provided. A second press working apparatus 40 (see FIG. 4).

  As shown in FIG. 3, the first press working apparatus 30 includes an upper die 31 and a lower die 32 that are relatively close to and away from each other. In order to extend and extend the target region 22 to be the thin wall portion 21 of the blank material 20, the upper die 31 is provided with a plurality of dies 33 (four in the illustrated example) having a circular arc surface in section, and the lower die. 32 is provided with a plurality of punches 34 (three in the illustrated example) each having an arcuate cross section. The die 33 is held on the upper die 31 so as to be movable up and down, and the punch 34 is held on the lower die 32 so as to be movable up and down. Each punch 34 is disposed between the dies 33. The die 33 and the punch 34 are arranged so that their axes are parallel to each other. The die 33 and the punch 34 correspond to a press surface having a corrugated cross section provided in the first press working apparatus 30.

  In order to constrain both ends of the target region 22, the upper die 31 is provided with an upper blank holder 35, and the lower die 32 is provided with a lower blank holder 37 supported by cushion pins 36.

  In the figure, a member simplified by a T-shape indicates a cushion 38 to which a cushion pressure by hydraulic pressure or the like is applied. The die 33 and the punch 34 are applied with a cushion pressure and are driven from a position indicated by a solid line to a position indicated by a broken line. Further, the upper and lower blank holders 35 and 37 are applied with a cushion pressure and sandwich both end portions of the target region 22. At this time, the dies 33 at both ends also sandwich the both end portions of the target region 22 with the lower blank holder 37. As clearly shown in FIGS. 1A and 1B, inflow of material from the non-target region 23 is allowed to some extent in the target region 22. The pressure for sandwiching both end portions of the target region 22 is appropriately selected within a range that allows a certain amount of material to flow into the target region 22 and that can be thinned by projecting the target region 22 into a cross-sectional waveform.

  As shown in FIGS. 4A and 4B, the second press working apparatus 40 includes an upper die 41 and a lower die 42 that are relatively close to and away from each other. Flat die faces 43 and 44 are provided on the upper and lower molds 41 and 42 in order to return the target region 22 formed into a cross-sectional waveform to the original flat plate shape. The die faces 43 and 44 correspond to a press surface having a flat cross section provided in the second press working apparatus 40.

  Next, the operation will be described.

  First, the first pressing step is performed (FIG. 1B). That is, as shown in FIG. 3, after transporting the blank material 20 between the upper and lower molds 31, 32 of the first press working device 30, a cushion pressure is applied to the upper and lower blank holders 35, 37, and the blank material 20 The both ends of the target area 22 are sandwiched. Further, a cushion pressure is also applied to the die 33 and the punch 34, and the die 33 and the punch 34 are driven from a position indicated by a solid line to a position indicated by a broken line. By this press working, the target region 22 is stretched and formed into a corrugated cross-sectional shape, and is evenly extended and thinned. In the first pressing step, both end portions of the target region 22 are restrained while allowing the material to flow from the non-target region 23 to the target region 22 to some extent. For this reason, as shown in FIGS. 1A and 1B, the plate material that has undergone the first pressing step is slightly shrunk from the blank material 20 in the left-right width direction in the drawing. Since the axes of the die 33 and the punch 34 are parallel to each other, the target region 22 subjected to the overhang forming has a parallel wave shape.

  Next, a second pressing step is performed (FIG. 1C). That is, as shown in FIG. 4A, after the plate material 26 that has undergone the first pressing step is conveyed between the upper and lower molds 41 and 42 of the second press working apparatus 40, the flat die faces 43 and 44 are transferred. Press at. By this press working, as shown in FIG. 4B, the target region 22 formed into a cross-sectional waveform is returned to the original flat plate shape. As a result of the wave shape of the target region 22 being returned to the flat plate shape, as shown in FIGS. 1A and 1C, the differential thickness plate material W is slightly extended from the blank material 20 in the width direction. The yield of the material is improved by this elongation dimension L.

  By going through the first and second pressing steps, the hardness of the target region 22 increases, and the tensile strength due to work hardening also improves. When tested using a test piece, the tensile strength of the aluminum material was improved by 1.1 to 1.3 times.

  In this way, the differential thickness plate material W can be formed using a relatively simple facility such as press working, and since the press work is performed, the processing time is also shorter than that of the rolling process. Therefore, the differential thickness plate material W can be easily formed, and it is possible to suppress an increase in processing cost.

  As described above, in the manufacturing method of the differential thickness plate material W according to the first embodiment, the thin blank portion 21 that is thinner than other portions is partially formed on the plate-like blank material 20. In the method of manufacturing the differential thickness plate material W, the target region 22 to be the thinned portion 21 of the blank material 20 is stretched and formed into a corrugated cross section by the first press working device 30 having a corrugated press surface. The target region 22 formed into a corrugated cross section is returned to the original flat plate shape by the first press step (see FIG. 1B) to be extended and the second press working apparatus 40 having a flat cross section press surface. Since the second pressing step (see FIG. 1C) is included, the differential thickness plate material W can be easily formed, and the increase in the processing cost can be suppressed.

  Moreover, the manufacturing apparatus of the differential thickness board | plate material W of 1st Embodiment partially forms the thin part 21 with thin thickness compared with another site | part in the plate-shaped blank material 20, and a differential thickness board | plate material In the apparatus for manufacturing W, in order to extend the target region 22 to be the thin-walled portion 21 of the blank material 20 into a corrugated cross section, the first press working apparatus 30 (including a press surface having a corrugated cross section) ( 3), and a second press working device 40 (see FIG. 4) having a flat cross-section press surface in order to return the target region 22 formed into a cross-sectional waveform to the original flat plate shape. Therefore, the differential thickness plate material W can be easily formed, and the increase in the processing cost can be suppressed.

(Second Embodiment)
FIG. 5 (A) is a cross-sectional view showing the differential thickness plate material W in which the bending wrinkles 50 remain in the portions that were the apex portions 24 and 25 of the cross-sectional waveform after the second pressing step, FIG. 5 (B). These are the schematic block diagrams which show the 2nd press processing apparatus 60 with which the manufacturing apparatus of the differential thickness board | plate material W which concerns on the 2nd Embodiment of this invention is implemented, and implements a 2nd press process, FIG.5 (C) These are sectional drawings which show the difference thickness board | plate material W in which the bending habit 50 was correct | amended. 6A and 6B are perspective views showing the reverse bending protrusion 66 added to the press surface 64 of the second press working apparatus 60. FIG.

  As shown in FIG. 5 (A), depending on the material of the blank material 20, the thickness, the extent of bulging, and the like, even after the second pressing step, the apex portions 24 and 25 of the cross-sectional waveform were obtained. There is a possibility that the bending habit 50 may remain in the part due to work hardening. The apex portions 24 and 25 of the cross-sectional waveform include both the apex portion 24 of the mountain (see the two-dot chain line in FIG. 1B) and the apex portion 25 of the valley (see the broken line in FIG. 1B). It is. The bending warp 50 protrudes about 1 mm from the flat surface, has a convex shape in the upward direction in the figure at the peak part 24 of the mountain, and downward in the figure at the part that is the peak part 25 of the valley. Convex shape.

  In the second embodiment, it is intended to return the differential thickness plate material W to a more flat state. Therefore, in the second pressing step, the portions that are the apex portions 24 and 25 of the corrugated cross section are formed by the reverse bending protrusions 65 and 66 added to the die faces 63 and 64 that are the pressing surfaces of the second pressing apparatus 60. The reverse bending process which correct | amends the bending beak 50 which remains in is included.

  In FIGS. 5A and 5B and FIGS. 6A and 6B, the bending fold 50 and the reverse bending protrusions 65 and 66 are exaggerated for easy understanding.

  As shown in FIG. 5 (B), the upper die 61 of the second press working apparatus 60 has a plurality of reverse bending projections 65 for correcting the bending folds 50 remaining in the portion that was the peak portion 24 of the mountain. (3 in the illustrated example) are provided, and the lower die 62 is provided with a plurality of reverse bending protrusions 66 (in the illustrated example, 4) for correcting the bending shank 50 remaining in the portion that was the apex portion 25 of the valley. It has been.

  The reverse bending protrusions 65 and 66 are provided at positions corresponding to the portions that are the apex portions 24 and 25 in a state where the target region 22 formed into a cross-sectional waveform is returned to the original flat plate shape. Further, when performing the second pressing step, the positions of the reverse bending projections 65 and 66 and the portions that are the apex portions 24 and 25 are determined by a positioning mechanism (not shown) provided in the second press working device 60. Matching is done.

  The reverse bending protrusions 65 and 66 are, for example, rib shapes extending in the longitudinal direction along the vertex portions 24 and 25 (see FIG. 6A), or dimple shapes scattered along the vertex portions 24 and 25. An arbitrary shape can be adopted depending on the dimension of the bend mark 50 (see FIG. 6B). The heights of the reverse bending protrusions 65 and 66 may be appropriately determined according to the degree of the remaining bending comb 50, but when the remaining bending comb 50 has a height of about 1 mm, for example, 0. What is necessary is just to set to about 5 mm-1 mm. Moreover, it is preferable to set the contact surface with the bending beak 50 to an arc surface.

  In the second embodiment, when the second pressing step is performed, the target region 22 formed into a cross-sectional waveform is returned to the original flat plate shape, as in the first embodiment. By the reverse bending protrusions 65 and 66, the reverse bending process is performed on the portions that are the apex portions 24 and 25 of the cross-sectional waveform. This reverse bending process corrects and eliminates or eliminates the bending habit 50 remaining in the portions of the apex portions 24 and 25. Therefore, as shown in FIG. 5C, a flatter differential thickness plate material W can be obtained.

  In addition, you may provide a micro recessed part in the press surface facing the protrusions 65 and 66 for reverse bending.

  As described above, in the manufacturing method of the differential thickness plate material W of the second embodiment, the second pressing step is the reverse bending applied to the press surfaces 63 and 64 of the second press working device 60. In addition to the operation and effect of the first embodiment, the projections 65 and 66 include a reverse bending process that corrects the bending wrinkle 50 remaining in the apex portions 24 and 25 of the cross-sectional waveform. The differential thickness plate material W can be formed even more flat.

(Third embodiment)
FIG. 7A is a front view showing the differential thickness plate material W on which the beads 71 and 72 are formed after the second pressing step according to the third embodiment of the present invention, FIG. These are sectional views which follow the 7B-7B line of Drawing 7 (A). FIG. 8 is a schematic perspective view showing a second press working apparatus 80 which is provided in the apparatus for manufacturing the differential thickness plate material W according to the third embodiment of the present invention and performs the second pressing step. . FIG. 8 specifically shows the bead protrusions 86 and 87 added to the press surfaces 83 and 84 of the second press working apparatus 80.

  Through the first and second pressing steps described in the first or second embodiment, parallel traces are formed at equal intervals in the target region 22 of the differential thickness plate material W. Although the tensile strength of the target region 22 is increased by work hardening, there is a possibility that the fatigue strength is reduced by bending back. For this reason, after the differential thickness plate material W is press-molded into a part shape, if the part is damaged for some reason, the damage may proceed along the bending trace.

  In the third embodiment, it is intended to prevent the breakage from proceeding along the bending trace. Therefore, in the second pressing process, the first protrusion intersecting the apex portions 24 and 25 of the cross-sectional waveform by the bead protrusions 86 added to the die faces 83 and 84 which are the pressing surfaces of the second press working apparatus 80. The bead formation process which forms the bead 71 extended along this direction is included.

  7 and 8, the first direction intersecting the apex portions 24 and 25 of the cross-sectional waveform is the X direction, and the second direction orthogonal to the first direction is the Y direction. This Y direction is also a direction in which one vertex 24, 25 extends. Therefore, a plurality of the bending traces are formed in the Y direction and in parallel in the X direction. In FIG. 7A, the bead 71, 72 having a valley shape appearing on the surface Wa (the surface of the paper surface in the drawing) of the differential thickness plate W is represented by a broken line, and the bead 71, 72 having a mountain shape is a two-dot chain line. It is represented by 7 and 8, the beads 71 and 72 and the bead protrusions 86 and 87 are exaggerated for easy understanding. In this specification, the Y direction is defined as a “column”.

  As shown in FIGS. 7A and 7B, in the target region 22, a plurality of beads 71 are formed in the X direction and a plurality of beads 71 in the Y direction. More specifically, three rows of valley bead rows 73 having a valley shape and four rows of mountain bead rows 74 having a mountain shape are alternately formed with respect to the surface Wa of the differential thickness plate material W. Each of the valley bead rows 73 includes five beads 71 extending in the X direction, and each of the mountain bead rows 74 includes four beads 71 extending in the X direction. Further, each of the bead rows 73 and 74 is also formed with a bead 72 extending in the Y direction through a substantially central portion of the bead 71 extending in the X direction. In the following description, the bead 71 extending in the X direction is also abbreviated as “X direction bead 71”, and the bead 72 extending in the Y direction is also abbreviated as “Y direction bead 72”. Further, both the X-direction bead 71 and the Y-direction bead 72 may be collectively referred to simply as a bead 70.

  The plurality of X-direction beads 71 in one row and the plurality of X-direction beads 71 in other rows adjacent to the one row are alternately arranged.

  Further, the X-direction beads 71 in one row and the X-direction beads 71 in other rows adjacent to the one row are only in the X direction by the dimension indicated by the symbol “m” in FIG. Overlapping along.

  A second press working apparatus 80 for forming the X-direction bead 71 and the Y-direction bead 72 is shown in FIG.

  As shown in the drawing, the lower die 42 of the second press working apparatus 80 is provided with a plurality of bead projections 86 in the X direction and a plurality of bead projections 86 in the Y direction. Similarly, the upper die 41 is provided with a plurality of bead projections in the X direction and a plurality of bead projections in the Y direction. The upper and lower molds 41 and 42 are provided with a concave groove 96 extending in the X direction into which the bead protrusion 86 is fitted.

  The bead protrusion row is provided with a bead protrusion 87 extending in the Y direction through a substantially central portion of the bead protrusion 86 extending in the X direction. Correspondingly, the groove array is provided with a groove 97 extending in the Y direction through a substantially central portion of the groove 96 extending in the X direction. In the following description, the bead protrusion 86 extending in the X direction is also abbreviated as “X direction bead protrusion 86”, and the bead protrusion 87 extending in the Y direction is also abbreviated as “Y direction bead protrusion 87”. The groove 96 extending in the direction is also abbreviated as “X-direction groove 96”, and the groove 97 extending in the Y direction is also abbreviated as “Y-direction groove 97”.

  It is preferable that the Y-direction bead protrusion 87 has the functions of the reverse bending protrusions 65 and 66 described in the second embodiment.

  The plurality of X-direction bead projections 86 in one row and the plurality of X-direction concave grooves 96 in another row adjacent to the one row are alternately arranged.

  Further, the X-direction bead protrusion 86 in one row and the X-direction concave groove 96 in another row adjacent to the one row are only in the X direction by the dimension indicated by the symbol “m” in FIG. Overlapping along.

  In the third embodiment, when the second pressing step is performed, the target region 22 formed into a cross-sectional waveform is returned to the original flat plate shape in the Y direction as in the second embodiment. By the bead projection 87, the reverse bending process is performed on the portions which are the apex portions 24 and 25 of the cross-sectional waveform. Further, the bead forming process is performed by the X-direction bead protrusion 86 and the Y-direction bead protrusion 87. By the reverse bending process, the bending habits 50 remaining in the portions of the apex portions 24 and 25 are corrected, and the X direction bead 71 and the Y direction bead 72 are formed by the bead forming process.

  Since the minute X-direction bead 71 is formed, the strength against bending in the direction intersecting the apex portions 24 and 25 of the cross-sectional waveform, that is, the direction intersecting the bending trace is increased. Further, since the minute Y-direction beads 72 are also formed, the strength against bending in the direction along the apex portions 24 and 25 of the cross-sectional waveform, that is, the direction along the bending trace, can be increased. For this reason, the work hardening of the target region 22 through the first and second pressing steps and the effect of the microbeads 70 are combined, so that a decrease in fatigue strength due to bending back is suppressed, and stress is dispersed. Therefore, even if the part is damaged for some reason after the thickness difference plate material W is press-formed into the part shape, the damage is prevented from proceeding along the bending trace.

  Here, since a plurality of X direction beads 71 are formed in the X direction and in the Y direction, a decrease in fatigue strength due to bending back can be suppressed and stress can be dispersed over almost the entire surface of the target region 22. It is possible to reliably prevent the breakage from proceeding along the bending trace.

  Further, since the plurality of X-direction beads 71 in one row and the plurality of X-direction beads 71 in other rows adjacent to the one row are alternately arranged, the stress is preferably dispersed. It is possible to prevent the breakage from proceeding along the bending trace.

  Further, since the X-direction beads 71 in one row and the X-direction beads 71 in other rows adjacent to the one row overlap each other along the X direction, the stress is more preferably distributed. It is possible to prevent the breakage from proceeding along the bending trace.

  As described above, in the manufacturing method of the differential thickness plate material W according to the third embodiment, the second pressing step is a bead protrusion 86 (added to the pressing surface of the second pressing apparatus 80 ( The bead formation process which forms the bead 71 (X direction bead 71) extended along the 1st direction (X direction) which cross | intersects with the vertex parts 24 and 25 of a cross-sectional waveform by the protrusion 86 for X direction beads is included. Therefore, in addition to the operational effects of the first embodiment, it is possible to suppress a decrease in fatigue strength due to bending back and to distribute the stress, and the parts made of the differential thickness plate material W are damaged for some reason. Even if it occurs, it is possible to prevent the breakage from proceeding along the bending trace.

  In addition, since a plurality of beads 71 (X direction beads 71) are formed in the first direction (X direction) and in a second direction (Y direction) orthogonal to the first direction, It is possible to suppress a decrease in fatigue strength due to bending back and to distribute stress over almost the entire surface of the target region 22, and to reliably prevent breakage from proceeding along the bending trace.

  In addition, a plurality of beads 71 (X direction beads 71) in one row and a plurality of beads 71 (X direction beads 71) in another row adjacent to the one row are alternately arranged. Therefore, the stress can be suitably dispersed, and the breakage can be more reliably prevented from proceeding along the bending trace.

  Further, the bead 71 (X direction bead 71) in one row and the bead 71 (X direction bead 71) in another row adjacent to the one row are along the first direction (X direction). Therefore, the stress can be more suitably distributed, and the breakage can be further reliably prevented from proceeding along the bending trace.

  In addition, although embodiment which formed the bead 70 which makes a valley shape and the bead 70 which makes a mountain shape on the basis of the surface Wa of the difference thickness board | plate material W was demonstrated, either bead 70 which makes a valley shape or a mountain shape was demonstrated. You may form only. Moreover, although the case where both the X direction bead 71 and the Y direction bead 72 were formed was shown, even if only the X direction bead 71 is formed, a decrease in fatigue strength due to bending back can be suppressed and stress can be dispersed. Even if the component made of the differential thickness plate material W is damaged for some reason, it is possible to prevent the damage from proceeding along the bending trace.

  The present invention can be applied to form a differential thickness plate using a relatively simple facility called press working.

1 (A) to 1 (C) are diagrams showing steps of a method for manufacturing a differential thickness plate material according to the first embodiment of the present invention. FIGS. 2A to 2C are views showing a process of manufacturing a part from the manufactured differential thickness plate material. It is a schematic block diagram which shows the 1st press work apparatus with which the manufacturing apparatus of the difference thickness board material which concerns on the 1st Embodiment of this invention is implemented, and implements the 1st press process shown by FIG. 1 (B). . 4 (A) and 4 (B) are provided in the apparatus for manufacturing a differential thickness plate material according to the first embodiment of the present invention, and the second pressing step shown in FIG. 1 (C) is performed. It is a schematic block diagram which shows a press work apparatus. FIG. 5 (A) is a cross-sectional view showing the differential thickness plate material in which the bending habit remains in the portion that was the apex portion of the cross-sectional waveform after the second pressing step, and FIG. FIG. 5C is a schematic configuration diagram showing a second press working apparatus that is provided in the apparatus for manufacturing a differential thickness plate material according to the second embodiment and performs the second pressing process, and FIG. It is sectional drawing which shows the different thickness board | plate material. 6 (A) and 6 (B) are perspective views showing reverse bending protrusions added to the press surface of the second press working apparatus. FIG. 7A is a front view showing a differential thick plate material on which beads are formed after the second pressing step according to the third embodiment of the present invention, and FIG. It is sectional drawing which follows the 7B-7B line of (A). It is a schematic perspective view which shows the 2nd press work apparatus with which the manufacturing apparatus of the difference thickness board material which concerns on the 3rd Embodiment of this invention is implemented, and implements a 2nd press process.

Explanation of symbols

20 blank material,
21 Thin part,
22 target area,
24, 25 The apex of the cross-sectional waveform,
30 First press working apparatus,
33 die (the press surface of the corrugated cross section of the first press working device),
34 punch (press surface of the corrugated cross section of the first press working device),
40, 60, 80 Second press working device,
43, 44 Die face (press surface having a flat cross section of the second press working apparatus 40),
50.
63, 64 die face (press surface of the second press working device 60),
65, 66 Reverse bending protrusion,
71 X-direction bead (bead extending along the first direction intersecting the vertex of the cross-sectional waveform),
72 Y direction bead,
83, 84 Die face (press surface of second press working apparatus 80),
86 X-direction bead protrusion (bead protrusion),
87 Y-direction bead protrusion,
96 X-direction groove,
97 Y-direction groove,
W differential plate material,
A first direction intersecting the apex of the X-section waveform,
Y Second direction orthogonal to the first direction.

Claims (7)

In the method of manufacturing a differential thickness plate material by partially forming a thin-walled portion with a thin thickness compared to other parts on the plate-shaped blank material,
A first pressing step of extending the target region to be the thin-walled portion of the blank material into a cross-sectional corrugated shape by a first press working device having a corrugated press surface;
A second pressing step of returning the target area formed into a corrugated cross-section to an original flat plate shape by a second press working apparatus having a flat cross-section press surface. A manufacturing method of thick plate material.   The second pressing step includes a reverse bending process of correcting a bending defect remaining at a top portion of the corrugated cross section by a reverse bending protrusion added to the press surface of the second pressing apparatus. The manufacturing method of the differential thickness board | plate material of Claim 1 characterized by the above-mentioned.   In the second pressing step, a bead that forms a bead extending along a first direction intersecting with the apex of the corrugated section is formed by a bead protrusion added to the press surface of the second press working apparatus. The method for producing a differential thickness plate material according to claim 1, further comprising a forming process.   4. The manufacturing of the differential thickness plate according to claim 3, wherein a plurality of the beads are formed in the first direction and in a second direction orthogonal to the first direction. 5. Method.   5. The differential thickness plate according to claim 4, wherein a plurality of beads in one row and a plurality of beads in another row adjacent to each other in the one row are alternately arranged. Manufacturing method.   6. The differential thickness according to claim 5, wherein a bead in one row and a bead in another row adjacent to each other in the one row overlap with each other in the first direction. A method for manufacturing a plate material. In an apparatus for manufacturing a differential thickness plate material by partially forming a thin-walled portion that is thinner than other parts in a plate-shaped blank material,
In order to extend the target region to be the thin-walled portion of the blank material into a cross-sectional corrugated shape, the first press working device provided with a press surface having a corrugated cross-section,
A second press working apparatus having a flat cross-section press surface to return the target area formed into a corrugated cross-section to the original flat plate shape. Manufacturing equipment.

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