Pressing device and method for processing plate material using the same pressing device

Abstract

To provide a press device capable of suppressing distortion and warping even when irregularities are formed on a plate material and achieving a high material yield, and a method for processing the plate material using the press device. [Solution] The press machine has a pair of clamping sections (blank holders (71a) to (74b) and upper die clamping sections (91a) to (94b)) that clamp the outer peripheral edge (11) of the sheet material (10) while forming the processed section (23), and a pair of non-clamping sections (supporting sections (63a) to (66) (lower die non-clamping sections) and opposing sections (83a) to (86) (upper die non-clamping sections)) that are adjacent to each other in the circumferential direction and do not clamp the outer peripheral edge (11) of the sheet material (10) while forming the processed section (23). The flange section (30) has bent sections (31a) to (37b) that correspond to the pair of clamping sections, and steady sections (32a) to (38) that correspond to the pair of non-clamping sections.

Description

[Technical Field]

[0001] The present invention relates to a press apparatus equipped with a blank holder. [Background technology]

[0002] Patent Document 1 discloses a technique for obtaining a press-formed product in which irregularities are formed in a plate material by press working.

[0003] The press device of Patent Document 1 includes a die on which the plate material is placed, a die holder located on the outer periphery of the die, a punch that forms irregularities together with the die, and a blank holder that can move independently of the punch and that clamps the outer edge of the plate material together with the die holder. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-077621 Summary of the Invention [Problem to be solved by the invention]

[0005] Generally, when a square or rectangular plate is clamped with a blank holder around all four sides to form irregularities in the plate and remove the distortion of the irregularities, because the press-formed product is a thin plate-like material, springback causes tension and compression forces around all four sides, causing the corners of the press-formed product to warp, making it unstable and difficult to transport to the next process using a conveying device, etc.

[0006] To remove distortion, the press device of Patent Document 1 is equipped with a distortion-correcting punch. The distortion-correcting punch is housed in a hole formed in the vertical direction in the die holder and is driven by a hydraulic cylinder built into the lower part of the die holder. The distortion-correcting punch forms a recess on the outer edge of the formed product, thereby removing distortion from the formed product. However, this results in a complex die structure and increases manufacturing costs. Another method for removing distortion is to deeply draw a sheet material, but this method results in poor material yield and leaves room for improvement.

[0007] An object of the present invention is to provide a press device that can suppress distortion and warping even when irregularities are formed in plate material and that has a high material yield, and a plate material processing method using the press device. [Means for solving the problem]

[0008] The present disclosure provides a press apparatus for performing press processing on a plate material to obtain a press-formed product, a die and a punch capable of forming an uneven processed portion on the plate material; a pair of outer peripheral portions located on the outer periphery of the punch and the die and overlapping the outer peripheral edge of the plate material in the thickness direction of the plate material, The pair of outer peripheries, except for the portions corresponding to the corners of the plate material, a pair of clamping portions that clamp the outer peripheral edge of the plate material while the processed portion is being formed; By having a pair of non-clamping portions adjacent to each other in the circumferential direction, which do not clamp the outer peripheral edge of the plate material during the formation of the processed portion, The press-molded product comprises a molded product main body portion having the processed portion and a flange portion surrounding the molded product main body portion, The flange portion has a bent portion corresponding to the pair of sandwiching portions and a constant portion corresponding to the pair of non-sandwiching portions, The press device is provided such that the bent portion and the stationary portion are located at different positions relative to the thickness direction of the press-molded product.

[0009] Furthermore, the present disclosure provides a method for processing a plate material, including a forming step of obtaining a press-formed product from the plate material by a press device, a die and a punch capable of forming an uneven processed portion on the plate material; a pair of outer peripheral portions located on the outer periphery of the punch and the die and overlapping the outer peripheral edge of the plate material in the thickness direction of the plate material, The pair of outer peripheries, except for the portions corresponding to the corners of the plate material, a pair of clamping portions that clamp the outer peripheral edge of the plate material while the processed portion is being formed; By having a pair of non-clamping portions adjacent to each other in the circumferential direction, which do not clamp the outer peripheral edge of the plate material during the formation of the processed portion, The press-molded product comprises a molded product main body portion having the processed portion and a flange portion surrounding the molded product main body portion, The flange portion has a bent portion corresponding to the pair of sandwiching portions and a constant portion corresponding to the pair of non-sandwiching portions, The method for processing a plate material is provided, wherein the bent portion and the steady portion are located at different positions relative to the thickness direction of the press-formed product. [Effects of the Invention]

[0010] The present invention can provide a press device that can suppress distortion and warping even when irregularities are formed in plate material and has a high material yield, and a plate material processing method using the press device. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a perspective view of a plate material and a press-formed product obtained by applying press working to the plate material. FIG. [Figure 2] FIG. [Figure 3] Fig. 3A is a diagram showing a plate material placed in a press machine. Fig. 3B is a diagram showing a state in which the punch is lowered and the plate material is in contact with the die. Fig. 3C is a diagram explaining the formation of bent portions during the formation of concaves and convexes. Fig. 3D is a diagram explaining the state after press working is completed. [Figure 4]Figure 4A is a 4A-4A diagram of Figure 3A. Figure 4B is a 4B-4A diagram of Figure 3B. Figure 4C is a 4C-4C diagram of Figure 3C. Figure 4D is a 4D-4D diagram of Figure 3D. Figure 4E is a 4E-4E diagram of Figure 3A. Figure 4F is a 4F-4F diagram of Figure 3B. Figure 4G is a 4G-4G diagram of Figure 3C. Figure 4H is a 4H-4H diagram of Figure 3D. [Figure 5] FIG. [Figure 6] Fig. 6A is a diagram illustrating the lengths of the bent portion and the constant portion. Fig. 6B is a cross-sectional view taken along line 6B-6B in Fig. 6A. Fig. 6C is a diagram illustrating a press-formed product in which the constant portion is set long. Fig. 6D is a cross-sectional view taken along line 6D-6D in Fig. 6C. [Figure 7] FIG. 10 is a diagram illustrating a first cutting step. [Figure 8] FIG. 10 is a diagram illustrating a second cutting step. [Figure 9] FIG. 1 is a diagram schematically showing stresses generated in a flange of a plate material during normal drawing (drawing). [Figure 10] FIG. 2 is a diagram schematically illustrating stresses generated in a flange of a plate material during drawing (drawing) in an example. DETAILED DESCRIPTION OF THE INVENTION

[0012] <Example> The embodiments will be described with reference to the accompanying drawings. Note that the embodiments described here are not intended to particularly limit the present invention. Furthermore, the same reference numerals are used to designate components and parts that perform the same functions, and redundant explanations will be omitted or simplified as appropriate. In the drawings, Fr indicates front, Rr indicates rear, Le indicates left, Ri indicates right, Up indicates top, and Dn indicates bottom.

[0013] (plate material) Please refer to Figure 1. The plate material 10 (blank material) is rectangular with its longitudinal direction extending in the front-to-rear direction and its transverse direction extending in the left-to-right direction. The outer peripheral edge 11 of the plate material 10 has a right edge 12, a left edge 13, a rear edge 14, a front edge 15, and four corners 16. The shape of the plate material 10 may be square or polygonal. The material of the plate material 10 is steel, but other materials such as aluminum alloys, which are used for components that make up a car body, can also be used.

[0014] (press-molded products) When the plate material 10 is subjected to press working, a press-formed product 20 is obtained. The press-formed product 20 has a rectangular product main body 21, a frame-shaped flange 30 surrounding the product main body 21, and a bead 40 formed between the product main body 21 and the flange 30 and protruding downward. The bead 40 may also protrude upward. Furthermore, the bead 40 does not necessarily have to be formed.

[0015] (Molded product main body) The molded article main body 21 has a flat plate portion 22, and four first processed portions 23 (processed portions) and two second processed portions 24 that are processed into an uneven shape on the flat plate portion 22. The shapes and numbers of the first processed portions 23 and the second processed portions 24 can be changed as appropriate.

[0016] (flange part) The flange portion 30 has a right flange portion 30a, a left flange portion 30b, a rear flange portion 30c, a front flange portion 30d, and four flange corner portions 39.

[0017] (bending part, shape part) The right flange portion 30a has three right bent portions 31a to 31c bent relative to the molded article main body portion 21, and two right constant portions 32a and 32b not bent relative to the molded article main body portion 21.

[0018] Similarly, the left flange portion 30b has left bent portions 33a to 33c and left straight portions 34a, 34b. The right flange portion 30a and the left flange portion 30b are symmetrical.

[0019] The rear flange portion 30c has rear bent portions 35a and 35b and a rear steady portion 36. The front flange portion 30d has front bent portions 37a and 37b and a front steady portion 38. The rear flange portion 30c and the front flange portion 30d are symmetrical.

[0020] (Press equipment) Please refer to Figures 1 and 2. A press device 50 that applies press processing to a plate material 10 to obtain a press-formed product 20 will be described. The press device 50 can be attached between a bolster and a slide of a press machine (not shown). The press device 50 includes a lower die 51 that can be fixed to the bolster and an upper die 54 that can be fixed to the slide.

[0021] (lower mold) The lower mold 51 has a punch 52, a lower mold product forming portion 60 in which four first recesses 61 capable of forming the first processing portion 23 and two second recesses 62 capable of forming the second processing portion 24 are formed, a plurality of support portions 63a to 66 capable of supporting the sheet material 10 when forming the processing portions 23, 24, four lower mold corner portions 69 capable of supporting each corner portion 16 of the sheet material 10 when forming the processing portions 23, 24, and a bead recess 68 capable of forming the bead 40.

[0022] The multiple support portions 63a to 66 include right support portions 63a, 63b capable of supporting the right edge 12 of the plate material 10, left support portions 64a, 64b capable of supporting the left edge 13, a rear support portion 65 capable of supporting the rear edge 14, and a front support portion 66 capable of supporting the front edge 15.

[0023] The bead recess 68 is rectangular and has a right recess 68a, a left recess 68b, a front recess 68c, and a rear recess 68d.

[0024] (blank holder) On the outer periphery of the lower die product forming section 60, a plurality of blank holders 71a to 74b (lower die clamping sections) are provided which are movable in the vertical direction independently of the punch 52.

[0025] The blank holders 71a to 74b include three right holders 71a to 71c capable of clamping the right edge 12 of the sheet material 10, three left holders 72a to 72c capable of clamping the left edge 13, two rear holders 73a, 73b capable of clamping the trailing edge 14, and two front holders 74a, 74b capable of clamping the leading edge 15.

[0026] (Blank holder and support position) The three right holders 71a to 71c and the two right support portions 63a and 63b are arranged alternately with respect to the direction along the right edge 12 of the plate material 10 (front-rear direction). The right holders 71a and 71c are located at both ends. Similarly, the three left holders 72a to 72c and the two left support portions 64a and 64b are arranged alternately with respect to the direction along the right edge 12 of the plate material 10 (front-rear direction). The right holders 71a and 71c are located at both ends.

[0027] The two rear holders 73a, 73b and the rear support portion 65 are arranged alternately with respect to the direction along the rear edge 14 of the plate material 10 (left-right direction). The rear holders 73a, 73b are located at both ends. Similarly, the two front holders 74a, 74b and the front support portion 66 are arranged alternately with respect to the direction along the rear edge 14 of the plate material 10 (left-right direction). The rear holders 73a, 73b are located at both ends.

[0028] (upper mold) The upper mold 54 has a die 55, an upper mold product forming section 80 having four first protrusions 81 capable of forming the first processing section 23 and two second protrusions 82 capable of forming the second processing section 24, a plurality of upper mold clamping sections 91a to 94b that clamp the outer peripheral edge 11 of the sheet material 10 together with the blank holders 71a to 74b, a plurality of opposing sections 83a to 86 (upper mold non-clamping sections) that face the plurality of support sections 63a to 66 of the lower mold 51 via the sheet material 10, an upper mold corner section 89 that can contact the four corners 16 of the sheet material 10, and a bead protrusion 88 that can form a bead 40.

[0029] The multiple upper mold clamping portions 91a to 94b include right clamping portions 91a to 91c capable of clamping the right edge 12 of the sheet material 10, left clamping portions 92a to 92c capable of clamping the left edge 13, rear clamping portions 93a, 93b capable of clamping the rear edge 14, and front clamping portions 94a, 94b capable of clamping the front edge 15.

[0030] The multiple opposing portions 83a to 86 include right opposing portions 83a, 83b, left opposing portions 84a, 84b, a front opposing portion 85, and a rear opposing portion 86. The opposing portions 83a to 86 are recessed higher than the upper mold sandwiching portions 91a to 94b.

[0031] The bead projection 88 has a right projection 88a, a left projection 88b, a rear projection 88c, and a front projection 88d.

[0032] (Outer periphery) The blank holders 71a to 74b and the support portions 63a to 66 form the lower die outer periphery 52. ​​The upper die sandwiching portions 91a to 94b and the opposing portions 83a to 86 form the upper die outer periphery 53. The lower die outer periphery 53 and the upper die outer periphery 56 form a pair of outer peripheries 53, 56.

[0033] (press molding) The following describes press molding (molding process) using the press device 50. Here, the right flange portion 30a will be described, but this description also applies to the other flange portions 30b to 30d.

[0034] Please refer to Figures 2, 3A, 4A and 4E. First, the plate material 10 is placed on the die. The right holders 71a to 71c support the plate material 10.

[0035] Next, the die 55 is lowered, and the right holders 71a to 71c and the right clamping portions 91a to 91c clamp the right edge 12 of the plate material 10. The first protrusion 81 and the second protrusion 82 of the upper die product forming portion 80 come into contact with the plate material 10 (although they do not necessarily have to come into contact).

[0036] The right support portions 63a, 63b and the lower die corner portion 69 of the lower die 51 are spaced apart from the right edge 12 of the plate material 10. The right opposing portions 83a, 83b and the upper die corner portion 89 of the punch 52 are spaced apart from the right edge 12 of the plate material 10.

[0037] See Figures 3B, 4B, and 4F. When the die 55 is further lowered, the right holders 71a to 71c also lower while clamping the right edge 12 of the sheet material 10. When the right holders 71a to 71c lower, the right edge 12 of the sheet material 10 comes into contact with the lower die product forming portion 60, the right support portions 63a and 63b, and the lower die corner portion 69. At this time, the right opposing portions 83a and 83b of the punch 52 and the upper die corner portion 89 are separated from the right edge 12 of the sheet material 10.

[0038] (Formation of bent parts) See Figures 3C, 4C, and 4G. When the die 55 is further lowered, the first processed portion 23, the second processed portion 24, and the bead 40 begin to be formed (processed portions 23, 24 are being formed). While processed portions 23, 24 are being formed, the right holders 71a-71c and the right clamping portions 91a-91c are lowered while clamping the right edge 12 of the plate material 10, and right bent portions 31a-31c are formed.

[0039] (Formation of the stationary part) During the formation of the processed portions 23 and 24, the right support portions 63a and 63b and the lower die corner portion 69 support the right edge 12 of the sheet material 10. The right opposing portions 83a and 83b and the upper die corner portion 89 are spaced apart from the right edge 12 of the sheet material 10. In other words, during the formation of the processed portions 23 and 24, the right edge 12 of the sheet material 10 is not sandwiched between the right support portions 63a and 63b and the right opposing portions 83a and 83b. Similarly, the corner 16 of the sheet material 10 is not sandwiched between the lower die corner portion 69 and the upper die corner portion 89. When the right bent portions 31a to 31c are formed, the right steady portions 32a and 32b begin to form relatively. The "steady portion" can also be defined as the portion between the corner and the bent portion of the press-formed product 20, or the portion located between the bent portions.

[0040] (Completion of press molding) Please refer to Figures 3D, 4D, and 4H. When the die 55 contacts the sheet material 10, the formation of the first processing portion 23, the second processing portion 24, and the bead 40 is completed, and the press-formed product 20 is obtained. When press forming is completed, the right opposing portions 83a, 83b contact the right stationary portions 32a, 32b. That is, the right stationary portions 32a, 32b are sandwiched between the right support portions 63a, 63b and the right opposing portions 83a, 83b. The corner portion 39 is sandwiched between the lower mold corner portion 69 and the upper mold corner portion 89. Note that when forming is completed, the right opposing portions 83a, 83b do not necessarily need to contact the right stationary portions 32a, 32b.

[0041] (Step of flange portion 30) Please refer to FIG. 3D and FIG. The right bent portions 31a to 31c and the right steady portions 32a, 32b are arranged alternately. The right bent portions 31a to 31c and the right steady portions 32a, 32b are located at different positions in the up-down direction (thickness direction of the press-formed product 20).

[0042] If there is only one right bent portion 31a-31c and one right steady portion 32a, 32b, the right flange portion 30a will be stepped. If there are multiple right bent portions 31a-31c, the right flange portion 30a will be wavy. A wavy shape increases the rigidity of the press-formed product 20. The same applies to the other flange portions 30b-30d. A detailed description will be omitted.

[0043] It is sufficient that at least one bent portion and at least one steady portion are formed in any one of the flange portions 30a to 30d, but it is preferable that at least one bent portion and at least one steady portion are formed in each of the flange portions 30a to 30d.

[0044] (length of curved and steady sections) Please refer to Figure 5. The lengths of the curved portions 31a to 37b and the lengths of the steady portions 32a to 38 can be changed as appropriate, but in any of the flange portions 30a to 30d, it is preferable that the length of any curved portion selected from each of the flange portions 30a to 30d be longer than the length of any steady portion selected from each of the flange portions 30a to 30d. An example will be described.

[0045] The length L1 of the left bent portion 33b is longer than the length L2 of the left steady portion 34b. The left bent portions 33a to 33c have the same length (all length L1). The left steady portions 34a, 34b have the same length (all length L2). The right flange portion 30a has a similar configuration.

[0046] See Figure 6A. The length L3 of the rear bent portion 35a (35b) is longer than the length L4 of the rear steady portion 36. The same is true for the front flange portion 30d. Note that, when the outer circumferential direction of the flange portion 30 is used as the reference, the rear steady portion 36 is the longest steady portion among the steady portions 32a to 38.

[0047] (Bead) Please refer to Figure 5. In a plan view, the bead 40 is annular, and has a right bead portion 41, a left bead portion 42, a front bead portion 43, and a rear bead portion 44. The bead 40 only needs to be formed at least between each of the steady portions 32a to 38 and the molded article main body portion 21.

[0048] (cross-sectional shape of the bead) Please refer to Figures 6A and 6B. The bead 40 (front bead portion 41) of the press-formed product 20 has a depth D1 and a radius of curvature R1.

[0049] See Figure 6C. The press-formed product 20A shown here is formed by a press (not shown) other than the press 50 (see FIG. 2). The length L5 of the rear steady portion 36A of the press-formed product 20A is longer than the length L4 of the rear steady portion 36 of the press-formed product 20 (L5>L4). In other words, the length of the rear steady portion 36, which is the longest steady portion of the press-formed product 20, is longer, and it can be said that this is the rear steady portion 36A of the press-formed product 20A. Relatively, the rear bent portions 35c and 35d are shorter than the rear bent portions 35a and 35b. The press-formed product 20A is symmetrical left to right and front to back.

[0050] In this way, when the length of the longest steady portion is increased (L4 → L5), the bead depth D2 of the press-formed product 20A is deeper than the bead depth D1 of the press-formed product 20 (D2 > D1). The curvature radius R2 of the bead 43A (40A) is set smaller than the curvature radius R1 of the bead 43 of the press-formed product 20.

[0051] Because the constant portion 36A is longer, material is more likely to move from the constant portion 36A to the molded product main body portion 21, which may cause wrinkles, but by using a configuration such as bead 43A, the movement of material from the constant portion 36A to the molded product main body portion 21 can be suppressed.

[0052] (Method of processing board materials) Next, a method for processing the plate material 10 using the press device 50 (see FIG. 2) will be described.

[0053] (molding process) Please refer to Figure 5. In the first forming step, a press-formed product 20 is obtained from a plate material 10 by a press device 50 .

[0054] (1st cutting process) Please refer to Figure 7. In the first cutting step after the molding step, the flange portion 30 is cut from the press-molded product 20 using a predetermined press machine to obtain the molded product main body portion 21 (first trim product). Note that the specific cutting method is not important as long as the molded product main body portion 21 is obtained. Another step may be performed between the molding step (see FIG. 5) and the first cutting step.

[0055] (2nd cutting process) Please refer to Figure 8. In the second cutting process following the first cutting process, a portion including the second processed portion 24 is cut from the molded article main body 21 (first trim portion) to obtain a second trim portion 26. The shape of the second trim portion 26 is not important as long as the portion including the second processed portion 24 is cut. The second trim portion 26 is, for example, approximately T-shaped and has a rectangular portion 26a including the first processed portion 23 and a protruding portion 26b protruding forward from a part of this portion 26a. The protruding portion 26b is a portion that was located between the two cut second processed portions 24.

[0056] It should be noted that another process may be performed between the first cutting process (see FIG. 7) and the second cutting process (see FIG. 8). In this embodiment, the second trim product 26 is the final molded product, but another process may be performed after the second cutting process. Furthermore, in this embodiment, one final molded product (second trim product 26) is obtained from one plate material 10, but multiple molded product main body portions may be obtained from one plate material, and final molded products may be obtained from each of the molded product main body portions.

[0057] The second trim product 26 is a battery housing cover for an electric vehicle. The present invention is applicable to any process for forming irregularities in the sheet material 10, but is particularly suitable for use in manufacturing body panel materials such as vehicle floor panels, roof panels, and outer panels.

[0058] (Effects of the Example) Please refer to Figures 1, 2 and 5. First, A press device 50 that applies press processing to a plate material 10 to obtain a press-formed product 20, a punch 52 and a die 55 capable of forming an uneven processed portion 23 on the plate material 10; a pair of outer peripheral portions 53, 56 located on the outer periphery of the die 55 and the punch 52 and overlapping the outer peripheral edge 11 of the sheet material 10 in the thickness direction of the sheet material 10; The pair of outer peripheral portions 53, 56 are formed in a manner such that, except for the portions corresponding to the corners 16 of the plate material 10, a pair of clamping portions (blank holders 71a to 74b and upper die clamping portions 91a to 94b) that clamp the outer peripheral edge 11 of the plate material 10 during the formation of the processed portion 23; By having a pair of non-sandwiching portions (supporting portions 63a to 66 (lower die non-sandwiching portions) and opposing portions 83a to 86 (upper die non-sandwiching portions)) adjacent to each other in the circumferential direction, which do not sandwich the outer peripheral edge 11 of the plate material 10 during the formation of the processed portion 23, The press-molded product 20 includes a molded product main body 21 having a processed portion 23 and a flange portion 30 surrounding the molded product main body 21. The flange portion 30 has bent portions 31a to 37b corresponding to the pair of sandwiching portions and flat portions 32a to 38 corresponding to the pair of non-sandwiching portions, A press device 50 is provided in which the curved portions 31a to 37b and the stationary portions 32a to 38 are located at different positions relative to the thickness direction (vertical direction) of the press-molded product 20.

[0059] Refer to FIG. 9. As a comparative example, the diagram shows the stresses generated in the flange 102 during and after forming of the formed product main body 101 of the sheet material 100 in a draw (squeezing) forming process in which the entire periphery (flange) of a flat sheet material is clamped by a blank holder and pulled during forming. When forming a concave-convex shape in the sheet material, the blank holder clamps the flange 102 around the entire periphery of the sheet material 100, and press working is performed to form the formed product main body 101 with the concave-convex shape and the flange 102 surrounding the formed product main body 101. During forming, the flange 102 is formed over the entire width of the side of the sheet material 100, for example, and is therefore compressed from both ends of the side toward the center of the side (see arrow C). After forming, this compressive force is released by springback, the compressive stress is reversed, and all four sides become tensile stress (see arrow T). The panel's behavior, with nowhere to go, acts along the diagonal, causing the corner to bounce up and, as a result, the corner to warp.

[0060] Next, the construction of the press device 10 will be described in simplified form. Please refer to Figure 10. The press device has a pair of clamping portions (see a pair of clamping portions 71b, 91b in Figure 3C) that clamp the flange portion 30A during molding of the molded product main body portion 21B of the plate material 20B, and a pair of non-clamping portions (see a pair of non-clamping portions 63b, 83b in Figure 3C) that do not clamp the flange portion 30B of the plate material 20B during molding of the molded product main body portion 21B.

[0061] As a result of the stress analysis, it was found that, on one side of the plate material 20B, the flange portion 30B of the plate material 20B is bent in a wavy (stepped) shape, and the compressive stress is divided at the steady portions 32a to 38, and divided and smaller tensile stress (see arrow T) is generated at the bent portions 31a to 37b. A large compressive stress directed from both ends of the side toward the center of the side, as in the draw of the comparative example, is not generated.

[0062] In other words, during forming, compressive stress is broken down into small tensile stress, and panel rigidity is improved, suppressing springback. Even if compressive stress (see arrow T) occurs after forming, the corners do not warp, so transportation is not hindered. The simple structure of bending the flange portion 30A of the plate material 20B into a wave shape can suppress warping and distortion of the corners that would hinder transportation of the press-formed product 20.

[0063] Please refer to Figure 5. Second, in the first press device 50, The plate material 10 is square (not shown) or rectangular having a long side and a short side. Each edge (flange portions 30a to 30d) of the press-formed product 20 has at least one bent portion 31a to 37b and at least one constant portion 32a to 38 formed thereon.

[0064] Since the straight portions 32a to 38 and the bent portions 31a to 37b are formed on each edge (flange portions 30a to 30d), the effect of dividing the tensile stress is further enhanced.

[0065] Third, in the press device 50 described in the second aspect, The press-molded product 20 has a rectangular shape, The flange portion 30 has longitudinally extending portions (right flange portion 30a and left flange portion 30b) that are symmetrical to each other. The flange portion 30 has portions (rear flange portion 30a and front flange portion 30d) extending in the short side direction that are symmetrical to each other, The number of steady portions formed in the longitudinal direction (three steady portions 31a to 31c formed on the right flange portion 30a) is This is greater than the number of steady portions formed in the short direction (one steady portion 36 formed on the rear flange portion 30c).

[0066] When the press-formed product 20 is rectangular, forming more constant portions 32a to 38 on the longitudinal sides than on the lateral sides enhances the effect of dividing the tensile stress, thereby suppressing warping at the corners of the press-formed product 20.

[0067] Fourth, in the first press device 50, Regarding each edge 12 to 15 (flange portions 30a to 30d) of the press-molded product 20, The length of the curved portions 31a to 37b is longer than the length of the stationary portions 32a to .

[0068] That is, in each of the flange portions 30a to 30d, any of the curved portions 31a to 37b is longer than any of the flat portions 32a to 38. The long curved portions allow the press-formed product 20 to be formed while being stable by removing any distortion caused by projections and recesses.

[0069] Fifth, in the first to fourth press devices 50, A bead 40 is formed between the molded product main body 21 of the press-molded product 20 and the stationary portions 32a to 38.

[0070] When the steady portions 32a to 38 are formed, the material flows toward the molded product main body 21, but the beads 40 prevent this flow, thereby preventing wrinkles from forming in the molded product main body 21.

[0071] Sixth, in the fifth press device 50, The bead 40 is annular.

[0072] By setting the press device 50 so that the bead-shaped portion is annular, it is possible to suppress the inflow of material around the entire outer edge 11 when forming the processed portion. This increases the rigidity of the press-molded product 20 and stabilizes its transportation.

[0073] Seventh, A method for processing a plate material (10), including a forming step of obtaining a press-formed product (20) from the plate material (10) by a press device (50), a punch 52 and a die 55 capable of forming an uneven processed portion 23 on the plate material 10; a pair of outer peripheral portions 53, 56 located on the outer periphery of the die 55 and the punch 52 and overlapping the outer peripheral edge 11 of the sheet material 10 in the thickness direction of the sheet material 10; The pair of outer peripheral portions 53, 56 are formed in a manner such that, except for the portions corresponding to the corners 16 of the plate material 10, a pair of clamping portions (blank holders 71a to 74b and upper die clamping portions 91a to 94b) that clamp the outer peripheral edge 11 of the plate material 10 during the formation of the processed portion 23; By having a pair of non-sandwiching portions (supporting portions 63a to 66 (lower die non-sandwiching portions) and opposing portions 83a to 86 (upper die non-sandwiching portions)) adjacent to each other in the circumferential direction, which do not sandwich the outer peripheral edge 11 of the plate material 10 during the formation of the processed portion 23, The press-molded product 20 includes a molded product main body 21 having a processed portion 23 and a flange portion 30 surrounding the molded product main body 21. The flange portion 30 has bent portions 31a to 37b corresponding to the pair of sandwiching portions and flat portions 32a to 38 corresponding to the pair of non-sandwiching portions, The method for processing a plate material 10 is provided, in which the curved portions 31a to 37b and the stationary portions 32a to 38 are located at different positions relative to the thickness direction of the press-formed product 20. The same effects as those of the first press device 50 described above are achieved.

[0074] Eighth, in the seventh method for processing the plate material 10, After the molding process, The method includes a first cutting step of cutting the flange portion 30 from the press-molded product 20 to obtain the molded product main body portion 21.

[0075] Because the flange portion 30 is cut and removed, it can be performed without affecting the design of the press-molded product 20 or the final molded product, making this a highly versatile molding method. Furthermore, because the stationary portions 32a-38 of the press-molded product 20 are not bent, they have a shape that protrudes outward more than the bent portions 31a-37b. This shape makes them easy to grasp by a conveying tool that conveys them from the molding process to the first cutting process, which has the effect of preventing them from falling during automatic conveyance.

[0076] Ninth, in the eighth method for processing the plate material 10, In the molding process, In addition to the processed portion, a second processed portion 24 having a concave-convex shape is formed on the press-molded product 20; After the first cutting step, The method includes a second cutting step of cutting the area including the second processed portion 24 from the molded article main body portion 21.

[0077] The second molded product obtained by cutting the portion including the second processed portion 24 from the molded product main body 21 is also press molded, so the second molded product can be manufactured without distortion or warpage at the corners.

[0078] Tenth, in the seventh method for processing the plate material 10, The press-molded product 20 has a bead 43 (40) formed between the molded product main body 21 and the stationary portion 36, With the outer circumferential direction of the flange portion 30 of the press-formed product 20 as a reference, the longest one of the plurality of steady portions 32a to 38 of the press-formed product 20 is defined as the longest steady portion (rear steady portion 36). When the length of the rear stationary portion 36, which is the longest stationary portion, is increased (L4 → L5), The press equipment is The bead 43A is deep (see D2) and / or the radius of curvature of the bead 43A (see R2) is small. It is set.

[0079] By using a configuration such as the bead 43A, the movement of material from the stationary portion 36A to the molded article main body portion 21 can be suppressed. [Explanation of symbols]

[0080] 10...Plate material 11...Outer edge 16...corner 20...Press-molded products 21…Molded product body part 23…Processing section 24…Second processing section 30...Flange 31...Right bending part 32...Right stationary part 33...Left bend 34...Left stationary part 35...Backward bending part 36... Posterior steady section (longest steady section) 37...Front bend 38...Post-stationary section 39...Flange corner 40...Bead 50...Pressing device 51…Lower mold 52...Punch 53...Outer periphery of lower die 54…Upper mold 55...Die 56...Outer periphery of upper die 63...Right support part (non-pinched part) 64...Left support part (non-clamping part) 65...Rear support part (non-clamping part) 66...Front support part (non-clamping part) 71...Right holder (clamping part) 72...Left holder (clamping part) 73...Rear holder (clamping part) 74...Front holder (clamping part) 83...Right facing part (non-pinched part) 84...Left facing part (non-pinched part) 85...Front facing part (non-clamping part) 86...Rear facing part (non-clamped part) 91...Right clamping part (clamping part) 92...Left clamping part (clamping part) 93... Rear clamping part (clamping part) 94...Front clamping part (clamping part)

Claims

1. A press device that applies press processing to a plate material to obtain a press-formed product, a die and a punch capable of forming an uneven processed portion on the plate material; a blank holder that clamps the plate material together with the die during formation of the processed portion; Equipped with The die and the blank holder are a pair of clamping portions configured to clamp the outer peripheral edge of the plate material during the formation of the processed portion; The punch and the die are a pair of non-clamping portions that do not clamp the outer periphery of the plate material during the formation of the processed portion; The pair of clamping portions and the pair of non-clamping portions are adjacent to the plate in the circumferential direction except for portions corresponding to the corners of the plate, The press-molded product comprises a molded product main body portion having the processed portion and a flange portion surrounding the molded product main body portion, The flange portion has a bent portion corresponding to the pair of sandwiching portions and a constant portion corresponding to the pair of non-sandwiching portions, The press device, wherein the bent portion and the steady portion are located at different positions relative to the thickness direction of the press-molded product.

2. The plate material is square or rectangular having a long side and a short side, At least one bent portion and at least one constant portion are formed on each edge of the press-formed product. The press device according to claim 1 .

3. When the press-molded product has a rectangular shape, The flange portions are symmetrical to each other in longitudinal direction, The flange portions have portions extending in a lateral direction that are symmetrical to each other, The number of the constant portions formed in the longitudinal direction is greater than the number of the constant portions formed in the lateral direction. The press device according to claim 2 .

4. For each edge of the press-formed product, The length of the bending portion is longer than the length of the constant portion. The press device of claim 1.

5. A press device for performing press processing on a plate material to obtain a press-formed product, a die and a punch capable of forming an uneven processed portion on the plate material; a pair of outer peripheral portions located on the outer peripheries of the punch and the die and overlapping the outer peripheral edge of the plate material in the thickness direction of the plate material, The pair of outer peripheries, except for the portions corresponding to the corners of the plate material, a pair of clamping portions that clamp the outer peripheral edge of the plate material while the processed portion is being formed; By having a pair of non-clamping portions adjacent to each other in the circumferential direction, which do not clamp the outer peripheral edge of the plate material during the formation of the processed portion, The press-molded product comprises a molded product main body portion having the processed portion and a flange portion surrounding the molded product main body portion, The flange portion has a bent portion corresponding to the pair of sandwiching portions and a constant portion corresponding to the pair of non-sandwiching portions, The bent portion and the steady portion are located at different positions relative to the thickness direction of the press-formed product, A press device capable of forming a bead between the molded product main body portion and the stationary portion of the press-molded product.

6. The bead is annular. The press device according to claim 5.

7. A method for processing a plate material, comprising a forming step of obtaining a press-formed product from the plate material by a press device, a die and a punch capable of forming an uneven processed portion on the plate material; a blank holder that clamps the plate material together with the die during formation of the processed portion, The die and the blank holder are a pair of clamping portions configured to clamp the outer peripheral edge of the plate material during the formation of the processed portion; The punch and the die are a pair of non-clamping portions that do not clamp the outer periphery of the plate material during the formation of the processed portion; The pair of clamping portions and the pair of non-clamping portions are adjacent to the plate in the circumferential direction except for portions corresponding to the corners of the plate, The press-molded product comprises a molded product main body portion having the processed portion and a flange portion surrounding the molded product main body portion, The flange portion has a bent portion corresponding to the pair of sandwiching portions and a constant portion corresponding to the pair of non-sandwiching portions, The method for processing a plate material, wherein the bent portion and the steady portion are located at different positions relative to the thickness direction of the press-formed product.

8. A method for processing a plate material, comprising a forming step of obtaining a press-formed product from the plate material using a press device, a die and a punch capable of forming an uneven processed portion on the plate material; a pair of outer peripheral portions located on the outer peripheries of the punch and the die and overlapping the outer peripheral edge of the plate material in the thickness direction of the plate material; The pair of outer peripheries, except for the portions corresponding to the corners of the plate material, a pair of clamping portions that clamp the outer peripheral edge of the plate material while the processed portion is being formed; By having a pair of non-clamping portions adjacent to each other in the circumferential direction, which do not clamp the outer peripheral edge of the plate material during the formation of the processed portion, The press-molded product comprises a molded product main body portion having the processed portion and a flange portion surrounding the molded product main body portion, The flange portion has a bent portion corresponding to the pair of sandwiching portions and a constant portion corresponding to the pair of non-sandwiching portions, The bent portion and the steady portion are located at different positions relative to the thickness direction of the press-formed product, After the molding step, a first cutting step of cutting the flange portion from the press-molded product to obtain the molded product main body, In the molding step, In addition to the processed portion, a second processed portion having a concave-convex shape is formed on the press-molded product, After the first cutting step, A second cutting step of cutting a portion including the second processed portion from the molded article main body portion, How to process boards.

9. A method for processing a plate material, comprising a forming step of obtaining a press-formed product from the plate material using a press device, a die and a punch capable of forming an uneven processed portion on the plate material; a pair of outer peripheral portions located on the outer peripheries of the punch and the die and overlapping the outer peripheral edge of the plate material in the thickness direction of the plate material; The pair of outer peripheries, except for the portions corresponding to the corners of the plate material, a pair of clamping portions that clamp the outer peripheral edge of the plate material while the processed portion is being formed; By having a pair of non-clamping portions adjacent to each other in the circumferential direction, which do not clamp the outer peripheral edge of the plate material during the formation of the processed portion, The press-molded product comprises a molded product main body portion having the processed portion and a flange portion surrounding the molded product main body portion, The flange portion has a bent portion corresponding to the pair of sandwiching portions and a constant portion corresponding to the pair of non-sandwiching portions, The bent portion and the steady portion are located at different positions relative to the thickness direction of the press-formed product, The press-molded product has a bead formed between the molded product main body portion and the stationary portion, When the longest one of the plurality of steady portions of the press-formed product is defined as the longest steady portion based on the outer circumferential direction of the flange portion of the press-formed product, The longer the length of the longest constant portion, The method for processing a plate material, wherein the press device is set so that the bead is deep and / or the radius of curvature of the bead is small.

Images