Mold apparatus and method of operating the mold apparatus

Abstract

The present invention provides a mold device that employs a fine blanking method and enables trimming within the wrinkle-holding surface. [Solution] The mold device comprises an upper die 11, a lower die 12, a pad 13 whose upper part is connected to the upper die 11, a punch 14 placed on the lower die 12 with its upper surface facing the lower surface of the pad 13, a first cushion ring 16 whose upper surface faces the lower surface of the upper die 11, and a second cushion ring 17 whose upper surface faces the lower surface of the pad 13. The second cushion ring 17 is attached to the first cushion ring 16 during the drawing process, and is attached to the lower die 12 simultaneously with the completion of the drawing process.

Description

Technical Field

[0001] The present disclosure relates to a die device and a method of operating the die device.

Background Art

[0002] In recent years, trimming and bending of materials using a die device have been performed. Patent Document 1 describes a punching device for a metal plate configured by a combination of a punch die, a die, and a wrinkle presser die, which is characterized by having a pressing means for the wrinkle presser die interlocked with the movement of the punch die.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] FIG. 3 is a configuration example of a die device having a related fine blanking structure. In particular, in FIG. 3, an example of a position where a wrinkle presser PF is originally desired to be set is indicated by a broken line.

[0005] Specifically, the die device includes an upper die 101 having an upper die extending portion 101a extending downward and provided with a trim blade at its lower end, a lower die 102, a pad 103, a punch 104, a pad pressure source 105, and a cushion ring 106 whose upper surface faces the lower surface of the upper die 101.

[0006] In this related die apparatus, the material is restrained by a cushion ring and a wrinkle-holding surface provided on the upper die, and deep drawing is performed using a punch and a pad. After the deep drawing is complete, the upper die descends further in the pressing direction, while still restraining the material together with the cushion ring. At this time, in this die apparatus, the pad does not descend because it is in contact with the punch through the material, and the force acting on the pad is absorbed by the contraction of the pad pressure source. In this die apparatus, during deep drawing, the boundaries between the upper die and the pad, and between the punch and the cushion ring are at the same height, but after the deep drawing is complete and the die descends, the trimming blade of the upper die becomes exposed from the pad, and the trimming blade of the punch becomes exposed from the cushion ring, allowing trimming to begin.

[0007] However, in this related mold device, the wrinkle-holding surface (PF) is the same as the trim line. Therefore, if an attempt is made to set the trim line outside the wrinkle-holding surface (PF), the trim line will be set within the wrinkle-holding surface. Here, the wrinkle-holding surface is the surface on which the material is blanked at the beginning of the drawing process. If the trim line is set within the wrinkle-holding surface, the trimming process will begin when the material is blanked, and the drawing process will not be completed. Consequently, this related mold device has a problem in that it is not possible to set the trim line outside the wrinkle-holding surface (PF), i.e., within the wrinkle-holding surface.

[0008] This disclosure provides a mold apparatus and a method for operating the mold apparatus that achieve trimming within a wrinkle-holding surface while employing a fine blanking process. [Means for solving the problem]

[0009] The mold apparatus according to this disclosure comprises an upper mold, a lower mold, a pad whose upper part is connected to the upper mold, a punch placed on the lower mold with its upper surface facing the lower surface of the pad, a first cushion ring whose upper surface faces the lower surface of the upper mold, and a second cushion ring whose upper surface faces the lower surface of the pad, wherein the second cushion ring is attached to the first cushion ring during the drawing process and is attached to the lower mold simultaneously with the completion of the drawing process. As a result, the first cushion ring continues to descend further while holding the material, exposing the trimming blade of the split cushion ring and allowing trimming to be performed with the upper trimming blade.

[0010] The method of operating a mold apparatus according to this disclosure comprises an upper mold, a lower mold, a pad whose upper part is connected to the upper mold, a punch placed on the lower mold with its upper surface facing the lower surface of the pad, a first cushion ring whose upper surface faces the lower surface of the upper mold, and a second cushion ring whose upper surface faces the lower surface of the pad, wherein during deep drawing, the second cushion ring is attached to the first cushion ring, and simultaneously with the completion of the deep drawing, the second cushion ring is attached to the lower mold. As a result, the first cushion ring continues to descend further while holding the material, exposing the trimming blade of the split cushion ring and allowing trimming to be performed with the upper trimming blade. [Effects of the Invention]

[0011] This disclosure provides a mold apparatus and a method for operating the mold apparatus that achieve trimming within the wrinkle-holding surface while employing a fine blanking method. [Brief explanation of the drawing]

[0012] [Figure 1] This is a cross-sectional view of the mold apparatus at the completion of the clamping process according to Embodiment 1. [Figure 2] This is a cross-sectional view of the mold apparatus at the completion of the trimming process according to Embodiment 1. [Figure 3] This is a cross-sectional view of the related mold apparatus. [Modes for carrying out the invention]

[0013] Embodiment 1 The mold apparatus 1 according to this embodiment will be described below with reference to the drawings.

[0014] Figure 1 shows an example of a cross-section of the mold apparatus 1 viewed from the side, at the completion of the deep drawing process and just before the start of the trimming process. The mold apparatus 1 comprises an upper die 11, a lower die 12, a pad 13 connected to the upper die 11, a punch 14 placed on the lower die 12, a pressure source 15 positioned between the upper die 11 and the pad 13, with its upper end connected to the upper die 11 and its lower end connected to the pad 13, a first cushion ring 16 with its lower end connected to the lower die 12, and a second cushion ring 17.

[0015] Furthermore, the first cushion ring 16 and the second cushion ring 17 are considered a single cushion ring, with the first cushion ring 16 being treated as the main cushion ring body and the second cushion ring 17 as a divided cushion ring.

[0016] Herein, for the sake of clarity, the following explanation will be based on the description in Figure 1, assuming that the pad 13 and punch 14 are on the left side, the first cushion ring 16 and upper die 11 are below the upper die plate-shaped portion 21, and the upper die extension portion 22 is on the right side, from a viewpoint in a predetermined direction.

[0017] The upper mold 11 has a thin upper mold plate-like portion 21 located on the left side and extending downward from the upper mold plate-like portion 21, and an upper mold extension portion 22 located on the right side. The upper mold 11 is fixed to the equipment (not shown). As will be described in detail later, the upper mold 11 can be lowered by power from the equipment.

[0018] A pad 13 is connected to the lower surface of the upper plate-shaped part 21 via an expandable / contractable part 18 that is expandable / contractible in the vertical direction. A pressure source 15 is provided between the upper plate-shaped part 21 and the pad 13 to provide the pressure necessary to operate the pad 13.

[0019] The lower surface 22a of the upper mold extending portion 22 faces the upper surface 16a of the first cushion ring 16. The lower surface 22a of the upper mold extending portion 22 and the upper surface 16a of the first cushion ring 16 form a wrinkle suppressing surface for pressing the material. A convex portion 22b that protrudes downward is formed in a part of the lower surface 22a of the upper mold extending portion 22, and it is inserted into a concave portion 16b provided on the upper surface of the first cushion ring 16.

[0020] Also, on the surface where the upper mold extending portion 22 faces the pad 13, that is, the left side surface in FIG. 1, a trimming portion 22c that protrudes to the left is formed from the lower left corner portion upward to be close to the pad 13 and the second cushion ring 17 provided below the pad 13 around the lower end portion. A trimming blade is provided on this trimming portion 22c.

[0021] The lower mold 12 is typically placed and fixed on equipment. The lower mold 12 has a plate-shaped lower mold plate portion 31 formed thin in the vertical direction, a lower mold extending portion 32 extending upward from the lower mold plate portion 31, and a lower mold protruding portion 33 protruding upward from the lower mold plate portion 31 at a position separated from the lower mold extending portion 32.

[0022] The lower mold plate portion 31 is provided on the right side in FIG. 1 and is arranged below the first cushion ring 16 and the second cushion ring 17. The lower end portion of the first cushion ring 16 is connected to the lower mold plate portion 31.

[0023] Here, the first cushion ring 16 will be described. The first cushion ring 16 has an extending portion 41 extending vertically and a plate portion 42 formed thin vertically. The extending portion 41 extends vertically below the upper mold extending portion 22 of the upper mold 11 as shown on the right side in FIG. 1. The plate portion 42 is arranged below the second cushion ring 17 as shown in the central portion in FIG. 1.

[0024] Furthermore, the first cushioning ring 16 is connected to the lower die plate-shaped portion 31 of the lower die 12 in a manner that allows it to move downward when pressed downward by the upper die extension portion 22. Specifically, the first cushioning ring 16 is connected to the lower die plate-shaped portion 31 of the lower die 12 at the lower part of the extension portion 41 and at the lower part of the plate-shaped portion 42.

[0025] As a result, when the upper mold extension 22 moves downward, the lower surface 22a of the upper mold extension 22 and the wrinkle-holding surface formed as the upper surface 16a of the first cushion ring 16 move downward.

[0026] As shown in Figure 1, the first cushion ring 16 can be shaped to protrude slightly to the left from the upper left corner, which is close to the pad 13 and punch 14.

[0027] Let's return to the explanation of the lower die 12. As shown on the left side of Figure 1, the punch 14 is placed above the lower die extension 32. That is, the lower surface of the punch 14 is in contact with the upper surface of the lower die extension 32.

[0028] Furthermore, the lower die projection 33 is a projection that protrudes upward from the lower die plate-shaped portion 31 at a position away from the lower die extension portion 32. As shown in Figure 1, at the completion of the drawing process and immediately before the start of the trimming process, the height of the upper end of the lower die projection 33 is approximately the same as the height of the upper surface of the plate-shaped portion 42 of the first cushion ring.

[0029] On the other hand, Figure 2 is a cross-section shown from the same viewpoint as Figure 1, and shows the state when trimming is complete and the upper die 11 and the first cushion ring 16 have moved to the bottom dead center. In this case, the height of the upper end of the lower die projection 33 is higher than the height of the upper surface of the plate-like portion 42 of the first cushion ring.

[0030] The pad 13 performs drawing of the material in combination with the punch 14 or in combination with the second cushion ring 17. In this case, the lower surface of the pad 13 has a shape such that the first lower surface 13a, which is above the punch 14, is higher than the second lower surface 13b, which is above the second cushion ring 17.

[0031] The first lower surface 13a of the pad 13 faces the upper surface 14a of the punch 14, allowing the pad to be lowered and drawing performed with material placed between these two surfaces. Furthermore, the second lower surface 13b of the pad 13 faces the upper surface 17a of the second cushion ring 17, allowing the pad to be lowered and drawing performed with material placed between these two surfaces.

[0032] Here, as shown in Figure 1, the boundary between the first lower surface 13a of the pad 13 and the upper surface 14a of the punch 14 is continuous with the boundary between the second lower surface 13b of the pad 13 and the upper surface 17a of the second cushion ring 17, and is higher on the left side, which is farther from the upper die extension 22, and lower on the right side, which is closer to the upper die extension 22.

[0033] As shown in Figure 1, the pad 13 can be shaped to protrude slightly upward from the lower right corner, which is close to the upper mold extension portion 22 and the first cushion ring 16.

[0034] The punch 14 is located below the first lower surface 13a of the pad 13, and in combination with the pad 13, it performs drawing of the material.

[0035] The pressure source 15 is a device that can generate a force to move the pad 13 downward. This allows the mold apparatus 1 to perform a drawing process by moving the pad 13 downward while the upper mold 11 and lower mold 12 are fixed.

[0036] The pressure source 15 can extend and retract in the vertical direction. Typically, the extension and retraction of the pressure source 15 is synchronized with the expandable / contractable portion 18 connected to the upper plate-shaped portion 21 and the pad 13.

[0037] The second cushioning ring 17 is positioned above the plate-shaped portion 42 of the first cushioning ring 16. The second cushioning ring 17 is also positioned below the second lower surface 13b of the pad 13, with the upper surface 17a of the second cushioning ring 17 and the second lower surface 13b of the pad 13 facing each other.

[0038] The upper surface 17a of the second cushion ring 17 is at approximately the same height as the upper surface 16a provided on the extended portion 41 of the first cushion ring 16. More specifically, as shown in Figure 1, upon completion of the drawing process, the height of the upper surface 16a of the first cushion ring 16 and the height of the upper surface 17a of the second cushion ring 17 are at approximately the same height, and as shown in Figure 2, upon completion of the trimming process, the height of the upper surface 16a of the first cushion ring 16 is lower than the height of the upper surface 17a of the second cushion ring 17.

[0039] The lower part of the second cushion ring 17 still has a first body portion 17b and a second body portion 17c formed thereon. The first body portion 17b is the part that abuts against the upper surface of the plate-shaped portion 42 of the first cushion ring 16 during the drawing process. On the other hand, when trimming is performed, the first body portion 17b is separated from the upper surface of the plate-shaped portion 42 of the first cushion ring 16 as the first cushion ring 16 is pressed downward by the upper die 11 and moves downward.

[0040] On the other hand, the second body portion 17c is attached to the upper part of the lower die projection 33 of the lower die 12 as soon as the drawing process is completed. As shown in Figure 2, when trimming is performed, the second body portion 17c is supported by the lower die projection 33.

[0041] As a result, the second cushion ring 17 can be attached together with the first cushion ring 16 during the drawing process, and simultaneously attached to the lower die 12 upon completion of the drawing process.

[0042] Then, when the drawing process is completed and trimming is performed, the second cushion ring 17 becomes separated from the first cushion ring 16. In other words, the second cushion ring 17 and the first cushion ring 16 are released from their attached state.

[0043] Furthermore, in the second cushion ring 17, a trim portion 17d is formed that protrudes to the right slightly downward from the upper right corner, which is close to the upper mold extension portion 22 and the first cushion ring 16. A trim blade is provided on this trim portion 17d.

[0044] Next, we will explain the operation of the mold device 1 in which the material is drawn and the trimming process after drawing is performed.

[0045] First, the operation during the drawing process of the material will be explained. The mold device 1 restrains the material between the lower surface 22a of the upper mold extension 22 of the upper mold 11 and the upper surface 16a of the first cushion ring 16 by lowering the upper mold 11.

[0046] Subsequently, the pressure source 15 generates a force to cause the pad 13 to move downward. At this time, the boundary between the second lower surface 13b of the pad 13 and the upper surface 17a of the second cushion ring 17 also acts as a wrinkle-reducing surface for the material.

[0047] A drawing process is performed between the first lower surface 13a of the pad 13 and the upper surface 14a of the punch 14. Furthermore, a drawing process is performed between the second lower surface 13b of the pad 13 and the upper surface 17a of the second cushion ring 17.

[0048] As shown in Figure 1, the right end of the boundary between the second lower surface 13b of the pad 13 and the upper surface 17a of the second cushion ring 17, and the left end of the boundary between the lower surface 22a of the upper die extension 22 and the upper surface 16a of the first cushion ring 16 are at the same height. In other words, at the end of the drawing process, the areas where these two boundaries are close to each other are at the same height.

[0049] Next, we will explain the trimming process after the completion of the drawing process.

[0050] After the drawing process is complete, the upper die 11 lowers while holding the material between its lower surface 13a and the upper surface 14a of the punch 14, and while the material is constrained between the lower surface 22a of the upper die extension portion 22 of the upper die 11 and the upper surface 16a of the first cushion ring 16.

[0051] Here, as the upper die 11 descends, the upper die plate portion 21 also descends, but the pad 13 cannot descend because it is in contact with the punch 14 through the material. Therefore, the downward force acting on the pad 13 due to the downward movement of the upper die 11 is absorbed by the contraction of the pressure source 15 and the expandable portion 18. As a result, the downward force acting on the second cushion ring 17 from the pad 13 is limited to a predetermined strength.

[0052] On the other hand, the upper mold extension 22 descends while pressing the first cushion ring 16 downwards. That is, since the first cushion ring 16 can descend in response to the downward pressure from the upper mold 11, the position of the boundary between the lower surface 22a of the upper mold extension 22 and the upper surface 16a of the first cushion ring 16 descends.

[0053] On the other hand, the second cushion ring 17 does not move downwards because it is supported by the second body portion 17c. Therefore, the position of the boundary between the lower surface 22a of the upper mold extension portion 22 and the upper surface 16a of the first cushion ring 16 moves below the position of the boundary between the lower surface 13a of the pad 13 and the upper surface 17a of the second cushion ring 17.

[0054] At this time, the trim portion 22c of the upper die extension 22 is exposed, and the trim blade of the trim portion 17d of the second cushion ring 17 is exposed, allowing for trimming of the material.

[0055] Based on the above, in the mold device 1, the cushion ring, which also serves as the lower cutting edge in the trimming process, is divided, and during the drawing process, the divided cushion ring, the second cushion ring 17, can be attached to the first cushion ring 16, which is the cushion ring body. Then, upon completion of the drawing process, the second cushion ring 17 can be attached to the lower die 12.

[0056] As a result, the first cushion ring 16 can descend while holding the material. At this time, the second cushion ring 17 is supported by the lower die 12, exposing the trim blade of the trim portion 17d provided on the second cushion ring 17, and fine blanking is achieved with the trim upper blade of the trim portion 22c provided on the upper die extension 22, thereby enabling trimming.

[0057] Therefore, the mold device 1 can perform both drawing and punching in the same process, as well as trimming within the wrinkle-holding surface.

[0058] It should be noted that the present invention is not limited to the embodiments described above, and can be modified as appropriate without departing from the spirit of the invention. In other words, the above description has been omitted and simplified as appropriate for the sake of clarity, and those skilled in the art can easily change, add, and modify each element of the embodiments within the scope of the present invention. [Explanation of symbols]

[0059] 1. Mold equipment 11 Upper mold 12 Lower mold 13 pads 13a First lower surface 13b Second lower surface 14 Punch 14a Top side 15 Pressure source 16. First cushioning ring 16a Top side 16b recess 17. Second cushioning ring 17a Top side 17b First body attachment section 17c Second torso section 17d Trim section 18 Telescopic part 21 Upper plate-shaped part 22 Upper mold extension part 22a Bottom side 22b Convex part 22c trim section 31 Lower plate-shaped part 32 Lower mold extension part 33 Lower mold protrusion 41 Extension 42 Plate-shaped part

Claims

1. Upper mold and, Lower mold and A pad whose upper part is connected to the upper mold, A punch placed on the lower mold, with its upper surface facing the lower surface of the pad, A first cushioning ring whose upper surface faces the lower surface of the upper mold, The pad comprises a second cushioning ring whose upper surface faces the lower surface of the pad, The aforementioned second cushioning ring is During the drawing process, the first cushion ring is attached to the body, and simultaneously with the completion of the drawing process, the body is attached to the lower die. Mold equipment.

2. The aforementioned second cushioning ring is When the aforementioned drawing process is completed and trimming is performed, the state in which the first cushion ring is attached to the body is released. The mold apparatus according to claim 1.

3. The aforementioned second cushioning ring is When the upper mold and the first cushioning ring move downward, they are supported by the lower mold. Trimming is performed using the trimming blade provided on the upper die and the trimming blade provided on the second cushion ring. The mold apparatus according to claim 1 or claim 2.

4. The aforementioned lower mold is, Lower plate-shaped part, A lower mold extension portion extending upward from the lower mold plate-like portion, It has a lower mold projection that protrudes upward from the lower mold plate-shaped portion at a position separate from the lower mold extension portion, The first cushioning ring is connected to the lower plate-shaped portion. The punch is placed on the lower mold extension portion. The second cushion ring is attached to the lower mold projection. The mold apparatus according to claim 1 or claim 2.

5. Upper mold and, Lower mold and A pad whose upper part is connected to the upper mold, A punch placed on the lower mold, with its upper surface facing the lower surface of the pad, A first cushioning ring whose upper surface faces the lower surface of the upper mold, A method for operating a mold apparatus comprising a second cushioning ring whose upper surface faces the lower surface of the pad, During the drawing process, the second cushion ring is attached to the first cushion ring. Simultaneously with the completion of the aforementioned drawing process, the second cushion ring is attached to the lower die. The operating method of a mold device.

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