Mold apparatus and method of operating the mold apparatus

Abstract

By employing a fine blanking method, the formation of wrinkles is suppressed, and trimming with a punch and upper die is facilitated, thereby suppressing the generation of chips and burrs. [Solution] The mold apparatus comprises an upper mold 11, a lower mold 12, a pad 13 whose upper part is connected to the upper mold 11, a punch 14 placed on the lower mold 12 with its upper surface facing the lower surface of the pad 13, a cushion ring 16 whose upper surface faces the lower surface of the upper mold 11, and a movable punch 17 connected to the lower mold 12 via a pressure source 18, with its upper surface facing the lower surface of the upper mold 11 and corresponding to the excess material shape. The material is restrained by being sandwiched between the upper mold 11 and the cushion ring 16, and the fine blanking method is performed using the movable punch 17 and the upper mold 11.

Description

Technical Field

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

Background Art

[0002] In recent years, trimming and bending of materials have been performed by using a mold device. Patent Document 1 discloses a composite mold device capable of continuously achieving trimming and bending in the same process.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the composite mold device described in Patent Document 1, instead of the main punch and the main die that are fixed and advantageous for cross-section synthesis, trimming is performed with a movable punch and a movable die that operate and are disadvantageous in die rigidity. Therefore, it is difficult to manage the knockout clearance, which is the cause of easy generation of chips and burrs during trimming.

[0005] From this, there is a possibility that chips will be placed on the upper surface of the punch due to negative pressure during panel conveyance, and quality defects such as unevenness of the panel may occur by performing drawing processing in that state.

[0006] Figure 2 shows an example of the configuration of a mold apparatus having a related fine blanking structure. Specifically, the mold apparatus comprises an upper mold 101 having an upper mold extension portion 101a that extends downward and has a trim blade at its lower end, a lower mold 102, a pad 103 having a gap for trim blade relief, a punch 104 having a trim blade and having a shape in which a part of the upper surface is recessed downward, a pad pressure source 105, and a cushion ring 106 whose upper surface faces the lower surface of the upper mold 101.

[0007] As shown in Figure 2, when an excess material shape is set on the cushion ring 106, the excess material shape is set within the wrinkle-retaining surface, which should ideally be a smooth, flat surface, causing undulations. This results in blank wrinkles being generated during the initial blanking stage of the drawing process, making the drawing process difficult.

[0008] This disclosure provides a mold apparatus and a method of operating the mold apparatus that employs a fine blanking method to suppress the occurrence of wrinkles and facilitate trimming with a punch and upper die, thereby suppressing the generation of chips and burrs. [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 cushion ring whose upper surface faces the lower surface of the upper mold, and a movable punch connected to the lower mold via a pressure source, with its upper surface facing the lower surface of the upper mold and corresponding to the excess material shape. The apparatus restrains the material by sandwiching it between the upper mold and the cushion ring, and performs a fine blanking process using the movable punch and the upper mold. This allows for the separation of excess material from the wrinkle-holding surface using a movable punch, thereby preventing wrinkles from forming in that area. This facilitates trimming using a movable punch and an upper die.

[0010] Furthermore, the method of operating 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 cushion ring whose upper surface faces the lower surface of the upper mold, and a movable punch connected to the lower mold via a pressure source, with its upper surface facing the lower surface of the upper mold and corresponding to an excess material shape, wherein the material is restrained by being sandwiched between the upper mold and the cushion ring, and the fine blanking method is performed using the movable punch and the upper mold. This allows for the separation of excess material from the wrinkle-holding surface using a movable punch, thereby preventing wrinkles from forming in that area. This facilitates trimming using a movable punch and an upper die. [Effects of the Invention]

[0011] This disclosure provides a mold apparatus and a method of operating the mold apparatus that employs a fine blanking method to suppress the occurrence of wrinkles and facilitate trimming with a punch and upper die, thereby suppressing the generation of chips and burrs. [Brief explanation of the drawing]

[0012] [Figure 1] This is a cross-sectional view of the mold apparatus according to Embodiment 1. [Figure 2] 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 from a side view, at the time of completion of the drawing process and immediately before the start of the trimming process. The mold apparatus 1 comprises an upper die 11, a lower die 12, a pad 13 whose upper end is connected to the lower surface of the upper die 11, a punch 14 placed on the lower die 12, a first 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 cushion ring 16 whose lower end is connected to the lower die 12, a movable punch 17, and a second pressure source 18.

[0015] 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 and the upper die extension 22, which extends vertically and horizontally from the cushion ring 16 and upper die 11, is on the right side when viewed from a predetermined direction.

[0016] The upper mold 11 has a thin, vertically oriented upper mold plate-like portion 21 located on the left side, and an upper mold extension portion 22 located on the right side that extends vertically. 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.

[0017] The lower surface of the upper plate-shaped portion 21 is connected to the pad 13 via an expandable portion that is expandable and contractible in the vertical direction. A first pressure source 15 is provided between the upper plate-shaped portion 21 and the pad 13 to provide the pressure necessary to operate the pad 13.

[0018] The lower surface 22a of the upper die extension 22 faces the upper surface 16a of the cushion ring 16. The lower surface 22a of the upper die extension 22 and the upper surface 16a of the cushion ring 16 form a wrinkle-retaining surface that holds down the material. A portion of the lower surface 22a of the upper die extension 22 has a convex portion 22b that protrudes downward and is inserted into a recess 16b provided on the upper surface of the cushion ring 16.

[0019] Furthermore, the lower surface 22a of the upper die extension portion 22 faces the upper surface 17a of the movable punch 17 that is disposed below the upper die extension portion 22 and between the cushion ring 16 and the punch 14.

[0020] Also, on the surface of the upper die extension portion 22 that faces the pad 13, that is, the left side surface in FIG. 1, a trim portion 22c that protrudes to the left is formed from the lower left corner portion upward and slightly to the left so as to be close to the pad 13 and the punch 14 in the vicinity of the lower end portion. A trim blade is provided on this trim portion 22c.

[0021] The lower die 12 is typically placed and fixed on equipment. The lower die 12 includes a plate-shaped lower die plate portion 31 formed thin in the vertical direction, a first lower die extension portion 32 extending upward from the lower die plate portion 31, and a second lower die extension portion 33 formed between the lower die plate portion 31 and the first lower die extension portion 32 and shorter in the vertical direction than the first lower die extension portion 32.

[0022] The lower die plate portion 31 is provided on the right side in FIG. 1 and is disposed below the cushion ring 16. The lower end portion of the cushion ring 16 is connected to the lower die plate portion 31.

[0023] As shown on the left side of FIG. 1, the punch 14 is placed above the first lower die extension portion 32. That is, the lower surface of the punch 14 is in contact with the upper surface of the first lower die extension portion 32.

[0024] The movable punch 17 is connected to the second lower die extension portion 33 via the second pressure source 18.

[0025] The pad 13 performs drawing of the material in combination with the punch 14. More specifically, the lower surface 13a of the pad 13 faces the upper surface 14a of the punch 14, and the pad is lowered with the material placed between these two surfaces to perform drawing. Here, the boundary between the lower surface 13a of the pad 13 and the upper surface 14a of the punch 14 is assumed to be higher on the left side, which is farther from the upper die extension 22 and the cushion ring 16, and lower on the right side, which is closer to the upper die extension 22 and the cushion ring 16, as shown in Figure 1.

[0026] 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 cushion ring 16.

[0027] The punch 14 is located below the lower surface 13a of the pad 13 and, in combination with the pad 13, performs drawing of the material. As shown in Figure 1, the punch 14 has a trim portion 14b that protrudes to the right from the upper right corner, which is close to the upper die extension portion 22 and the movable punch 17, slightly downward. A trim blade is provided on this trim portion 14b.

[0028] The first pressure source 15 is a device that can generate a force to move the pad 13 downward. This allows the mold device 1 to perform a drawing process by moving the pad 13 downward while the upper mold 11 and lower mold 12 are fixed.

[0029] The first pressure source 15 can extend and retract in the vertical direction. Typically, the extension and retraction of the first pressure source 15 are synchronized with the expandable / contractable portion connected to the upper mold plate portion 21 and the pad 13.

[0030] The cushion ring 16 is positioned below the upper die extension portion 22 of the upper die 11. The cushion ring 16 is also connected to the lower die plate portion 31 of the lower die 12 in a state that allows it to move downward when pressed downward by the upper die extension portion 22. As a result, when the upper die extension portion 22 moves downward, the position of the lower surface 22a of the upper die extension portion 22 and the wrinkle-holding surface formed as the upper surface 16a of the cushion ring 16 move downward.

[0031] As a result, the upper die extension 22 can move downward while pressing against the cushion ring 16 during trimming. At this time, the boundary between the lower surface 22a of the upper die extension 22 and the upper surface 17a of the movable punch 17 also moves downward.

[0032] The movable punch 17 is positioned above the second lower die extension 33. A portion of the movable punch 17 may also extend above the first lower die extension 32.

[0033] The upper surface 17a of the movable punch 17 faces the lower surface 22a of the upper die extension 22 and is used for fine blanking. In this case, the upper surface 17a of the movable punch 17 is higher towards the punch 14 side and lower towards the cushion ring 16 side. In other words, the boundary between the upper surface 17a of the movable punch 17 and the lower surface 22a of the upper die extension 22 is higher towards the punch 14 side on the left in Figure 1 and lower towards the cushion ring 16 side on the right.

[0034] As shown in Figure 1, the movable punch 17 can be shaped to protrude slightly downward from the upper left corner, which is close to the pad 13 and punch 14, and extend to the left.

[0035] The second pressure source 18 supplies the force to move the movable punch 17 up and down. Typically, the lower end of the second pressure source 18 is connected to the upper surface of the second lower die extension 33 of the lower die 12. The upper end of the second pressure source 18 is connected to the lower end of the movable punch 17.

[0036] 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.

[0037] First, let's explain the operation when drawing the material. 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 cushion ring 16 by lowering the upper mold 11.

[0038] The first pressure source 15 generates a force to cause the pad 13 to move downward. This causes drawing to occur between the lower surface 13a of the pad 13 and the upper surface 14a of the punch 14.

[0039] The second pressure source 18 generates a force to cause the movable punch 17 to move upward. As a result, the material is sandwiched between the upper surface 17a of the movable punch 17 and a portion of the lower surface of the upper die extension 22 of the upper die 11 that faces the upper surface 17a, and the excess material is drawn.

[0040] At this time, the right end of the boundary between the lower surface 13a of the pad 13 and the upper surface 14a of the punch 14, and the left end of the boundary between the lower surface 22a of the upper die extension 22 and the upper surface 17a of the movable punch 17 are at the same height. In other words, at the end of the drawing process, the points where these two boundaries are close to each other are at the same height.

[0041] Next, we will explain the trimming process after the drawing process is complete.

[0042] After the drawing process is complete, the upper die 11 moves downward 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 22 of the upper die 11 and the upper surface 16a of the cushion ring 16, and between the lower surface 22a of the upper die extension 22 and the upper surface 17a of the movable punch 17.

[0043] 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 first pressure source 15 and the expandable / contractible portion connected to the upper die 11 and the pad 13.

[0044] On the other hand, the upper mold extension 22 moves downward while pressing the cushion ring 16 downward. In other words, the cushion ring 16 moves downward in response to the downward pressure from the upper mold 11.

[0045] Furthermore, the upper die extension 22 moves downward while pressing the movable punch 17 downward. Here, the movable punch 17 is supported in a state where it can move downward by a predetermined distance because the second pressure source 18 is retractable. Therefore, the movable punch 17 moves downward while retracting the second pressure source 18.

[0046] Therefore, the position of the boundary between the lower surface 22a of the upper mold extension 22 and the upper surface 17a of the movable punch 17 is lowered.

[0047] This exposes the trim portion 22c of the upper die extension 22 and the trim blade of the trim portion 14b of the punch 14, allowing for trimming of the material.

[0048] Based on the above, in the mold device 1, the portion corresponding to the excess material shape can be separated from the wrinkle-holding surface by aligning it with the movable punch 17. Therefore, the mold device 1 can realize a fine blanking method using a movable punch and an upper die without generating blank wrinkles.

[0049] Trimming can also be performed using a punch 14 fixed to the equipment via an upper die 11 and a lower die 12, both of which are fixed to the equipment, do not move, and have advantageous cutting rigidity. Therefore, in the mold device 1, the punch clearance can be easily controlled, and the generation of burrs from the chips during trimming can be kept to a minimum.

[0050] 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]

[0051] 1. Mold equipment 11 Upper mold 12 Lower mold 13 pads 13a Bottom side 14 Punch 14a Top side 14b Trim section 15. First pressure source 16 Cushion Rings 16a Top side 16b recess 17 Movable Punch 17a Top side 18. Second pressure source 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 First lower mold extension 33 Second lower mold extension

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 cushioning ring whose upper surface faces the lower surface of the upper mold, The lower mold is connected to the upper mold via a pressure source, its upper surface faces the lower surface of the upper mold, and it comprises a movable punch corresponding to the excess material shape portion, The material is restrained by sandwiching it between the upper mold and the cushion ring. Using the movable punch and the upper die, a fine blanking method is performed. Mold equipment.

2. The aforementioned movable punch is When the upper mold moves downward, the pressure source is retractable, so that it is supported in a state that allows it to move downward by a predetermined distance. Trimming is performed using the trimming blade provided on the upper die and the trimming blade provided on the punch. The mold apparatus according to claim 1.

3. 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 cushioning ring whose upper surface faces the lower surface of the upper mold, A method for operating a mold apparatus comprising a movable punch connected to the lower mold via a pressure source, with its upper surface facing the lower surface of the upper mold, and corresponding to the excess material shape portion, The material is restrained by sandwiching it between the upper mold and the cushion ring. Using the movable punch and the upper die, a fine blanking method is performed. The operating method of a mold device.

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