Mold apparatus and method of operating the mold apparatus

Abstract

This process suppresses the occurrence of scratches and cracks during the drawing process, minimizes the generation of chips and burrs during the trimming process, and facilitates clearance control. [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, and a cushion ring 16 with its upper surface facing the lower surface of the upper die 11. Wrinkle suppression is performed between the lower surface of the upper die 11 and the upper surface of the cushion ring 16, and after drawing is performed by sandwiching the material between the pad 13 and the punch 14, the upper die 11 and the cushion ring 16 descend, and trimming is performed by the trim blade provided on the upper die 11 and the trim blade provided on the punch 14.

Description

Technical Field

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

Background Art

[0002] In recent years, trimming and bending of materials using a mold device have been performed. 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, trimming is performed not with a fixed main punch and main die that are advantageous for cross-section synthesis, but with a movable punch and movable die that are disadvantageous in punching rigidity during operation. 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 land 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] On the other hand, there is a mold device that does not use a movable punch or a movable die. FIG. 2 is a diagram showing an example of a cross-section of a related mold device. In this mold device, the pad has a floating structure, and drawing is performed together with the punch and the cushion ring with the initial load of a pressure source arranged directly below.

[0007] 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 pad 103.

[0008] After the drawing process is complete, in this die device, the pad 103 does not descend because it is in contact with the punch 104 through the material, and the downward movement of the press is absorbed by the contraction of the pad pressure source 105. However, the upper die 101 continues to descend with the press, exposing the upper trim blade through the trim blade relief gap provided in the pad 103. The punch 104 is also provided with a groove-shaped lower trim blade, and the trim blade of the upper die 101 bites into this groove, performing the trimming process and achieving the drawing.

[0009] However, in mold equipment, the pad 103 and punch 104 must each have a relief shape for the trim blade, which can cause the material to get caught during the drawing process, leading to scratches or cracks. Furthermore, regarding the trimming process, because the trim blade of the upper die is placed between the pads 103, the trim blade itself cannot ensure sufficient cross-sectional rigidity, making it difficult to control the extraction clearance and causing chips and burrs to easily form during trimming. In addition, the extraction angle also depends on the drawing shape, which can cause chips and burrs to form in different areas.

[0010] Based on the above, there are concerns about the occurrence of scratches and cracks during deep drawing in the relevant mold equipment, and chips and burrs are likely to occur during trimming. Furthermore, negative pressure during panel transport can cause chips to accumulate on the top surface of the punch, and performing deep drawing in this state may result in quality defects.

[0011] This disclosure provides a mold apparatus and a method for operating the mold apparatus that suppress the occurrence of scratches and cracks during deep drawing, minimize the generation of chips and burrs during trimming, and facilitate clearance control. [Means for solving the problem]

[0012] 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, and a cushion ring whose upper surface faces the lower surface of the upper mold. Wrinkle suppression is performed between the lower surface of the upper mold and the upper surface of the cushion ring, and after drawing is performed by sandwiching the material between the pad and the punch, the upper mold and the cushion ring descend, thereby performing trimming by a trim blade provided on the upper mold and a trim blade provided on the punch. This makes it possible to perform the drawing and punching process using the fine blanking method in the same process.

[0013] Furthermore, 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, and a cushion ring whose upper surface faces the lower surface of the upper mold, wherein wrinkle suppression is performed between the lower surface of the upper mold and the upper surface of the cushion ring, drawing is performed by sandwiching the material between the pad and the punch, and then the upper mold and the cushion ring descend, thereby performing trimming by a trim blade provided on the upper mold and a trim blade provided on the punch. This makes it possible to perform the drawing and punching process using the fine blanking method in the same process. [Effects of the Invention]

[0014] This disclosure provides a mold apparatus and a method of operating the mold apparatus that suppress the occurrence of scratches and cracks during deep drawing, minimize the generation of chips and burrs during trimming, and facilitate clearance control. [Brief explanation of the drawing]

[0015] [Figure 1]It is a cross-sectional view of the mold device according to Embodiment 1. [Figure 2] It is a cross-sectional view of a related mold device.

Modes for Carrying Out the Invention

[0016] Embodiment 1 Hereinafter, the mold device 1 according to the present embodiment will be described with reference to the drawings.

[0017] FIG. 1 is a view showing an example of a cross-section of the mold device 1 viewed from the side direction. The mold device 1 includes an upper mold 11, a lower mold 12, a pad 13 whose upper end is connected to the lower surface of the upper mold 11, a punch 14 placed on the lower mold 12, a pressure source 15 arranged between the upper mold 11 and the pad 13, whose upper end is connected to the upper mold 11 and whose lower end is connected to the pad 13, and a cushion ring 16 whose lower end is connected to the lower mold 12.

[0018] Here, in the following description, for the sake of easy explanation, in accordance with the description of FIG. 1, it is described as if the pad 13 and the punch 14 are on the left side from the viewpoint in a predetermined direction, and the upper mold extension part 22 in which the cushion ring 16 and the upper mold 11 extend vertically is arranged on the right side.

[0019] The upper mold 11 has an upper mold plate-shaped part 21 provided on the left side and being thin in the vertical direction, and an upper mold extension part 22 provided on the right side and having a shape extending longer downward than the upper mold plate-shaped part 21. Note that the upper mold 11 is fixed to equipment (not shown). As will be described in detail later, the upper mold 11 can perform a descending operation by the power from the equipment.

[0020] The lower surface of the upper mold plate-shaped part 21 is connected to the pad 13 via a telescopic part 17 that can expand and contract in the vertical direction. Also, a pressure source 15 for applying pressure to operate the pad 13 is provided between the upper mold plate-shaped part 21 and the pad 13.

[0021] The lower surface 22a of the upper die extending portion 22 faces the upper surface 16a of the cushion ring 16. The lower surface 22a of the upper die extending portion 22 and the upper surface 16a of the cushion ring 16, which will be described later, 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 die extending portion 22, and it is inserted into a concave portion 16b provided on the upper surface of the cushion ring 16.

[0022] Also, on the surface of the upper die extending portion 22 that 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 and a little 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 trimming blade is provided on this trimming portion 22c.

[0023] The lower die 12 is typically placed and fixed on equipment. The lower die 12 has a plate-shaped lower die plate portion 31 that is formed thin in the vertical direction and a lower die extending portion 32 that extends upward from the lower die plate portion 31.

[0024] The lower die plate portion 31 is provided on the right side in FIG. 1 and is arranged below the cushion ring 16 and the upper die extending portion 22. The lower end portion of the cushion ring 16 is connected to the lower die plate portion 31.

[0025] The punch 14 is placed above the lower die extending portion 32. That is, the lower surface of the punch 14 is in contact with the upper surface of the lower die extending portion 32.

[0026] The pad 13 performs squeezing processing 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 squeezing processing is performed by lowering the pad with the material provided between these two surfaces. Here, it is assumed that the boundary portion between the lower surface 13a of the pad 13 and the upper surface 14a of the punch 14 is high on the left side, which is a location far from the upper die extending portion 22 and the cushion ring 16, and low on the right side, which is a location close to the upper die extending portion 22 and the cushion ring 16, as shown in FIG. 1.

[0027] 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.

[0028] 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 cushion ring 16, slightly downward. A trim blade is provided on this trim portion 14b.

[0029] 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.

[0030] The pressure source 15 can extend and retract in the vertical direction. Typically, the extension and retraction of the pressure source 15 are synchronized with the expandable / contractable section 17 connected to the upper plate-shaped section 21 and the pad 13.

[0031] 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.

[0032] As shown in Figure 1, the 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.

[0033] 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.

[0034] 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.

[0035] Subsequently, the pressure source 15 generates a force to cause the pad 13 to move downward. This causes a drawing process to occur between the lower surface 13a of the pad 13 and the upper surface 14a of the punch 14.

[0036] 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 16a of the cushion ring 16, are at the same height at the end of the drawing process. 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.

[0037] Next, we will explain the trimming process after the drawing process is complete.

[0038] 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.

[0039] 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 17.

[0040] On the other hand, the upper die extension 22 moves downward while pressing the cushion ring 16 downward. That is, since the cushion ring 16 can move downward in response to the downward pressure from the upper die 11, the position of the boundary between the lower surface 22a of the upper die extension 22 and the upper surface 16a of the cushion ring 16 moves below the position of the boundary between the lower surface 13a of the pad 13 and the upper surface 14a of the punch 14.

[0041] At this time, the trim portion 22c of the upper die extension 22 is exposed, and the trim blade of the trim portion 14b of the punch 14 is exposed, allowing for trimming of the material.

[0042] Based on the above, in the mold apparatus 1, the upper mold extension portion 22 and the cushion ring 16 allow the material to be trimmed in the vertical direction relative to the wrinkle-holding surface, and the portion provided on the side is used as a trim line. This eliminates the need for the trim blade relief shape provided on the punch and pad in the related mold apparatus shown in Figure 2, thereby suppressing the occurrence of scratches and cracks during the tightening process.

[0043] 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.

[0044] Furthermore, since the trimming process performed by this mold device 1 is a fine blanking process, the extraction conditions are more favorable compared to the related mold device shown in Figure 2. This also means that with mold device 1, the generation of burrs during trimming can be minimized.

[0045] Therefore, the mold device 1 can perform drawing and punching in the same process, and can also improve the quality of material processing.

[0046] 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]

[0047] 1. Mold equipment 11 Upper mold 12 Lower mold 13 pads 13a Bottom side 14 Punch 14a Top side 14b Trim section 15 Pressure source 16 Cushion Rings 16a Top side 16b recess 17 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

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, The upper mold comprises a cushioning ring whose upper surface faces the lower surface of the upper mold, Wrinkle suppression is performed between the lower surface of the upper die and the upper surface of the cushion ring, and after the material is sandwiched between the pad and the punch, As the upper die and the cushion ring descend, trimming is performed by the trimming blade provided on the upper die and the trimming blade provided on the punch. Mold equipment.

2. It is positioned between the upper mold and the pad and includes a pressure source that generates a force to operate the pad, The aforementioned pad is When the upper die descends, it does not descend because, due to contact with the punch via the material, the force is absorbed by the contraction of the pressure source. The upper mold and the punch are, The upper die descends, and the trimming process is performed by the trimming blade that is exposed because the pad does not descend. The mold apparatus according to claim 1.

3. The aforementioned upper mold is, Upper plate-shaped part, It has an upper mold extension portion that extends downward from the upper mold plate-shaped portion, The punch is positioned below the upper die plate-like portion. The cushion ring is positioned below the upper mold extension. The mold apparatus according to claim 1 or claim 2.

4. The aforementioned lower mold is, Lower plate-shaped part, It has a lower mold extension portion that extends upward from the lower mold plate-like portion, The cushion ring is connected to the lower plate-shaped portion. The punch is placed on the lower mold extension. 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 method for operating a mold apparatus comprising a cushion ring whose upper surface faces the lower surface of the upper mold, Wrinkle suppression is performed between the lower surface of the upper die and the upper surface of the cushion ring, and after the material is sandwiched between the pad and the punch, As the upper die and the cushion ring descend, trimming is performed by the trimming blade provided on the upper die and the trimming blade provided on the punch. The operating method of a mold device.

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