Press molding machine

Abstract

To provide a press molding apparatus in which the mold is deformable, and which maintains a distance of a certain distance or less between the mold and the lifter. [Solution] The press molding apparatus 1 according to the present invention comprises a base plate 11, an elastically deformable elastic plate 12 suspended and supported by the base plate 11, an upper die 13 fixed to the lower surface of the elastic plate 12 so as to be in close contact with it and deformable to follow the shape of the elastic plate 12, a lower die 14 provided below the upper die 13 so as to be opposite to the upper die 13, an upper die demolding lifter 152 that is movable up and down and positioned on the side of the upper die 13, and a stepped bolt 17c connecting the upper die 13 and the upper die demolding lifter 152. The upper die demolding lifter 152 has a through hole 153 through which the shaft portion of the stepped bolt 17c can move up and down, the shaft portion of the stepped bolt 17c passes through the through hole 153 and is fixed to the upper die 13, and the head of the stepped bolt 17c abuts against the side surface of the upper die demolding lifter 152.

Description

Technical Field

[0001] The present invention relates to a press molding device.

Background Art

[0002] As an insulator for a separator of a fuel cell or an electronic substrate, a plate-shaped resin member may be used. Patent Document 1 discloses a method for manufacturing an electronic component including a resin sheet. In the method described in Patent Document 1, a resin sheet is pressed with an elastically deformable plate to extrude air in the resin sheet. Thereby, an electronic component can be manufactured while suppressing the generation of voids.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The method of Patent Document 1 can also be applied to the processing of a resin sheet. For example, by pressing a sheet-shaped resin workpiece using an elastically deformable mold, a product can be processed while extruding air in the workpiece. At this time, for the purpose of demolding the workpiece after pressing from the mold, a lifter that can contact the workpiece during and after pressing may be provided on the side surface of the mold. However, if the mold is deformable, the distance between the mold and the lifter is likely to vary, and problems such as demolding failure may occur.

[0005] The present invention has been made in view of such circumstances, and provides a press molding device that keeps the distance between a mold and a lifter at a certain distance or less in a press molding device in which the mold is deformable.

Means for Solving the Problems

[0006] The press molding apparatus according to the present invention comprises a base plate, an elastically deformable elastic plate suspended and supported from the base plate, an upper die fixed to the lower surface of the elastic plate so as to be in close contact with it and deformable to follow the shape of the elastic plate, a lower die provided below the upper die so as to be opposite to the upper die, an upper die demolding lifter positioned on the side of the upper die and movable up and down, and a stepped bolt connecting the upper die and the upper die demolding lifter, wherein the upper die demolding lifter has a through hole through which the shaft portion of the stepped bolt can move up and down, the shaft portion of the stepped bolt passes through the through hole and is fixed to the upper die, and the head of the stepped bolt abuts against the side surface of the upper die demolding lifter. [Effects of the Invention]

[0007] The present invention provides a press molding apparatus in which the mold is deformable, and which maintains the distance between the mold and the lifter at or below a certain distance. [Brief explanation of the drawing]

[0008] [Figure 1] This is a cross-sectional view of a press molding apparatus according to this embodiment. [Figure 2] This is a cross-sectional view of a press molding apparatus according to this embodiment. [Figure 3] This is a cross-sectional view of the press molding apparatus according to this embodiment while a workpiece is being pressed. [Figure 4] This is a cross-sectional view of a modified upper mold removal unit. [Figure 5] This is a cross-sectional view of a modified upper mold demolding unit when connected to the upper mold. [Modes for carrying out the invention]

[0009] Specific embodiments to which the present invention is applied will be described in detail below with reference to the drawings. For clarity, the following description and drawings have been simplified as appropriate. In each drawing, the same or corresponding elements are denoted by the same reference numerals, and redundant explanations are omitted as necessary for clarity. Furthermore, the right-handed xyz coordinate system shown in Figure 1 and the other figures is for explaining the positional relationships of the components, with the positive z-axis pointing vertically upward.

[0010] Figures 1 and 2 are cross-sectional views of the press forming apparatus 1 according to this embodiment. Figure 1 is a cross-sectional view along cutting line II in Figure 2. Figure 2 is a cross-sectional view along cutting line II-II in Figure 1. Figure 3 is a cross-sectional view of the press forming apparatus 1 when pressing a workpiece W. As shown in Figures 1 to 3, the press forming apparatus 1 comprises a base plate 11, an elastic plate 12, an upper die 13, a lower die 14, an upper die demolding unit 15, a lower die demolding unit 16, and stepped bolts 17a to 17c. The press forming apparatus 1 is symmetrical with respect to the yz and zx planes with respect to the center line C.

[0011] The press molding apparatus 1 is a device that presses a workpiece W with an upper die 13 and a lower die 14 to mold the workpiece W. The workpiece W is a sheet of resin, and the shape of the lower surface of the upper die 13 and the upper surface of the lower die 14 are transferred to it by the press process. The workpiece W may be heated during the pressing process.

[0012] The base plate 11 is a component that serves as a base for supporting the elastic plate 12 and the upper die 13. The base plate 11 is a rigid body and is made of, for example, metal. During pressing, the base plate 11 descends and presses against the workpiece W.

[0013] The elastic plate 12 is an elastically deformable plate suspended and supported by the base plate 11. The material of the elastic plate 12 is not particularly limited as long as it is elastically deformable and can withstand the maximum load during pressing (e.g., 200 tons). The ends of the elastic plate 12 in the x-axis direction are suspended from the base plate 11 by bolts or wires (not shown). Under normal conditions, the elastic plate 12 hangs down at its center due to its own weight (see Figure 1). The shaft of a stepped bolt 17a is engaged with the center of the elastic plate 12, and the lower surface of the head of the stepped bolt 17a is in contact with the upper surface of the base plate 11. The length of the hanging of the elastic plate 12 can be adjusted by changing the length of the stepped bolt 17a that engages with the elastic plate 12. The hanging length of the elastic plate 12 can be, for example, 1 mm.

[0014] The upper die 13 is fixed so as to be in close contact with the lower surface of the elastic plate 12 and is formed to be deformable to follow the shape of the elastic plate 12. The upper die 13 is fixed to the lower surface of the elastic plate 12 by, for example, stepped bolts 17b. The material of the upper die 13 is not particularly limited as long as it is elastically deformable and can withstand the maximum load during pressing (for example, a load of 200 tons). Similar to the elastic plate 12, under normal conditions the upper die 13 hangs down near the center (see Figure 1). During pressing, the central part of the upper die 13 first contacts the workpiece W, and then the outer part of the upper die 13 gradually contacts the workpiece W from the part closer to the center (see Figure 3). As a result, the air contained in the workpiece W is pushed out, thereby suppressing the generation of voids.

[0015] The lower die 14 is positioned below the upper die 13, facing the upper die 13. The lower die 14 is a base plate on which the workpiece W is placed. The material of the lower die 14 is not particularly limited as long as it can withstand the maximum load during pressing (for example, a load of 200 tons).

[0016] The upper mold stripping unit 15 and the lower mold stripping unit 16 are unit components for stripping the upper mold 13 and the lower mold 14 from the workpiece W. Specifically, the upper mold stripping unit 15 abuts against the upper surface of the workpiece W during pressing and after press molding, and fixes the position of the workpiece W. By raising the upper mold 13 in this state, the workpiece W can be stripped from the upper mold 13. Further, the lower mold stripping unit 16 pushes up the workpiece W from below after press molding. Thereby, the workpiece W can be stripped from the lower mold 14.

[0017] The upper mold stripping unit 15 includes a lifter spring 151 and an upper mold stripping lifter 152. The lifter spring 151 is a spring member suspended from above on the outside of the upper mold 13. In the example of the present embodiment, the lifter spring 151 is housed inside the elastic plate 12. The upper mold stripping lifter 152 is connected to the lower end of the lifter spring 151.

[0018] The lower mold stripping unit 16 includes a lifter spring 161 and a lower mold stripping lifter 162, and is provided so as to face the upper mold stripping unit 15. The lifter spring 161 is a spring member provided so as to extend from the lower side to the upper part. In the example of the present embodiment, the lifter spring 161 is housed inside the lower mold 14. The lower mold stripping lifter 162 is connected to the upper end of the lifter spring 161.

[0019] Here, the structure of the upper mold stripping lifter 152 will be described in more detail. The upper mold stripping lifter 152 is disposed on the side portion of the upper mold 13 and has a through hole 153 penetrating in the x-axis direction. The shaft portion of the stepped bolt 17c is formed to be vertically movable through the through hole 153. The shaft portion of the stepped bolt 17c passes through the through hole 153 and is fixed to the upper mold 13, and the head of the stepped bolt 17c abuts against the side surface of the upper mold stripping lifter 152. In this way, the upper mold 13 and the upper mold stripping lifter 152 are connected by the stepped bolt 17c. The upper die stripping lifter 152 having the above configuration can move up and down, but its left - right movement is restricted by the stepped bolt 17c. Therefore, the distance between the upper die 13 and the upper die stripping lifter 152 is maintained at a certain distance or less.

[0020] Note that the distance between the upper die 13 and the upper die stripping lifter 152 is preferably 0.1 mm or less. If the distance between the upper die 13 and the upper die stripping lifter 152 exceeds 0.1 mm, the work W may enter the gap between the upper die 13 and the upper die stripping lifter 152 during pressing, which may cause product defects.

[0021] (Modified example) Next, referring to FIGS. 4 and 5, a modified example of the upper die stripping unit 15, the upper die stripping unit 25, will be described. FIG. 4 is a cross - sectional view of the upper die stripping unit 25. FIG. 5 is a cross - sectional view of the upper die stripping unit 25 when connected to the upper die 13. The upper die stripping unit 25 includes a lifter spring 251 and an upper die stripping lifter 252, and is similar to the upper die stripping unit 15 in that the upper die stripping lifter 252 has a through - hole 253. However, the upper die stripping unit 25 is different from the upper die stripping unit 15 in that the upper die stripping lifter 252 has a notch 254 that enlarges the upper side of the opening of the through - hole 253 on the surface where the head of the stepped bolt 17c abuts.

[0022] The side surface of the above - mentioned upper die stripping lifter 152 always abuts against the head of the stepped bolt 17c. Therefore, if the upper die 13 is curved, the upper die stripping lifter 152 will also tilt inward as if it falls (see FIG. 1). For this reason, a horizontal load is applied to the lifter spring 151. On the other hand, although the side surface of the upper die stripping lifter 252 also always abuts against the head of the stepped bolt 17c, because it has a notch 254, even when the upper die 13 is curved, the tilt of the upper die stripping lifter 252 can be kept small (see FIG. 5). For this reason, the load applied to the lifter spring 251 can be greatly suppressed.

[0023] Although the present invention has been described in accordance with specific embodiments, it is not limited to the embodiments described above. 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. [Explanation of Symbols]

[0024] 1. Press molding machine 11 Base Plate 12 Elastic plates 13 Upper mold 14 Lower mold 15, 25 Upper mold removal unit 151, 251 Lifter Springs 152, 252 Upper mold demolding lifter 153, 253 through holes 254 Notch 16 Lower mold demolding unit 161 Lifter Spring 162 Lower mold demolding lifter 17a~17c Stepped bolts Double job

Claims

1. base plate and An elastic plate that is elastically deformable and suspended from the base plate, An upper mold, which is fixed so as to be in close contact with the lower surface of the elastic plate and is deformable to conform to the shape of the elastic plate, A lower mold is provided below the upper mold so as to be opposite to the upper mold, An upper mold demolding lifter that is movable vertically and is positioned on the side of the upper mold, A stepped bolt connects the upper mold and the upper mold demolding lifter, The upper mold removal lifter has a through hole through which the shaft portion of the stepped bolt can move up and down, The shaft portion of the stepped bolt is fixed to the upper mold by passing through the through hole. The head of the stepped bolt abuts against the side surface of the upper mold removal lifter. Press molding machine.

2. The distance between the upper mold and the upper mold demolding lifter is 0.1 mm or less. The press molding apparatus according to claim 1.

3. The upper mold removal lifter has a notch on the side of the stepped bolt that contacts the head of the bolt, which enlarges the upper side of the opening of the through hole. The press molding apparatus according to claim 1.

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