JP2013095011A - Vacuum press frame body, and method for manufacturing press molded article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vacuum press frame body capable of suppressing a required vacuum volume as much as possible when performing hot press molding under vacuum.SOLUTION: The vacuum press frame body mounted on a press board of a press apparatus includes a pair of plate-like members having at least one portion of one surface out of a pair of opposing surfaces sinking in a recessed shape to form a closed space in which an object to be processed is stored when the plate-like members are overlapped with each other, and a vacuum pipe arrangement having one end communicated with the closed space and the another end connected to a prescribed vacuum pump. The pair of plate-like members are configured deformable so that press pressure during pressing by the press board is transmitted to the object to be processed in the closed space.

Description

  The present invention relates to a vacuum press frame for hot press molding a workpiece under vacuum, and a method for manufacturing a press-molded product that press-molds the workpiece using the vacuum press frame.

  In order to form a plate-like product such as a printed wiring board, a press apparatus for hot press forming a workpiece placed between hot plates is widely known and put into practical use. A specific configuration example of this type of conventional pressing apparatus is described in Patent Document 1. In the press apparatus described in Patent Document 1, the entire press machine is housed in a vacuum chamber, and after the workpiece is placed on the hot platen of the press machine, the vacuum chamber housing the press machine is sealed. . After the sealed vacuum chamber is evacuated by a vacuum pump or the like and reaches a predetermined degree of vacuum, the workpiece placed on the hot platen is hot press molded. In Patent Document 1, since the workpiece is hot press-molded under vacuum, voids in the press-molded product are suppressed.

JP 2002-307467 A

  However, in order to accommodate the entire press in the vacuum chamber, a large vacuum chamber is required, the press apparatus is enlarged, and a large installation area is required.

  The present invention has been made in view of the above circumstances, and the object of the present invention is to provide a vacuum press frame that can suppress the vacuum volume required when performing hot press molding under vacuum as much as possible, and An object of the present invention is to provide a method for manufacturing a press-formed product, in which a workpiece is press-molded using the vacuum press frame.

  A frame for vacuum press according to an embodiment of the present invention is a frame for vacuum press placed on a press board of a press device, and a closed space in which workpieces are accommodated when they are overlapped with each other. A pair of plate-like members in which at least part of at least one of the opposing surfaces falls into a concave shape, one end communicating with the closed space, and the other end connected to a predetermined vacuum pump so as to be formed The pair of plate-like members can be deformed so that the press pressure is transmitted to the workpiece in the closed space when pressed by the press board.

  The workpiece can be placed under vacuum by driving a vacuum pump connected to the vacuum pipe to deaerate the closed space. By hot-pressing the workpiece placed under vacuum together with the vacuum press frame, voids in the press-formed product can be suppressed as in the case of evacuating the existing vacuum chamber accommodated with the press. Since the vacuum press frame is of a size that can be placed on a press board of a press device, the vacuum volume required for hot press molding is smaller than that of the vacuum chamber. Therefore, it is not necessary to prepare a large vacuum pump with high exhaust capability.

  The pair of plate-like members is, for example, an elastic sheet member having flexibility. During hot press molding, the load from the press plate is deformed flexibly by receiving the load from the press plate, and the workpiece is processed. Can communicate evenly across the entire surface.

  A backflow prevention mechanism that prevents backflow of air from the vacuum pump side to the closed space side may be attached to the vacuum pipe. With the backflow prevention mechanism attached to the vacuum piping, for example, even when the vacuum piping is removed from the vacuum pump, outside air does not flow into the closed space, and the degree of vacuum in the closed space is maintained. It is.

  The pair of plate-like members may be formed larger than a press area where the press machine can press the workpiece. In this case, since the vacuum piping does not hinder hot press molding by the press machine, the vacuum pipe is preferably arranged so as to be positioned outside the press region when the vacuum press frame is placed on the press machine.

  The pair of plate-like members may be ones whose sides are fixed so that the opposing surfaces open in a booklet shape. In this case, when the pair of booklet-shaped plate members is opened, the workpiece can be placed on the opposing surface of one plate-like member, and when the pair of plate-like members are closed, the workpiece is placed on the opposing surface. The placed workpiece can be accommodated in the closed space. That is, the workpiece can be accommodated in the closed space through a simple operation of opening and closing the pair of plate-like members.

  A method for producing a press-formed product according to an embodiment of the present invention is a method for press-molding a workpiece using the vacuum press frame, and is an opposing surface that defines a closed space in the vacuum press frame. A workpiece placing step for placing the workpiece on the region, a housing step for housing the workpiece in a closed space by overlapping a pair of plate members, and a vacuum pipe. A deaeration step of driving a predetermined vacuum pump and degassing the closed space via the vacuum pipe, and a frame body mounting step of mounting the vacuum press frame body after degassing on the press panel of the press device And a press-forming step of pressing the workpiece together with the vacuum press frame mounted on the press board to form the workpiece. Further, after the deaeration step, before the press molding step, a step of removing the vacuum piping and the vacuum pump may be further included.

  ADVANTAGE OF THE INVENTION According to this invention, the vacuum press frame which can suppress a vacuum volume required when performing hot press molding in a vacuum as much as possible, and a workpiece is press-molded using this vacuum press frame. A method for manufacturing a press-formed product is provided.

It is a front view of the press apparatus of embodiment of this invention. It is a disassembled perspective view which shows the structure of the frame for vacuum presses of embodiment of this invention. It is the upper side figure and sectional drawing of the frame for vacuum presses of embodiment of this invention. It is a figure for demonstrating the manufacturing method of the press molded product which hot-press-forms a to-be-processed object using the frame for vacuum presses of embodiment of this invention.

  Hereinafter, a press device according to an embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a front view of the press device 1 of the present embodiment. As shown in FIG. 1, a press device 1 is a vertical hot press device in which a pair of hot press hot plate bodies are arranged side by side in a vertical direction, and for example, hot press a coverlay against a base material. To produce FPC (Flexible Printed Circuits). The press apparatus 1 includes a press frame 2 that is rigidly supported by a base B that is an installation unit. The press frame 2 includes a frame base 21 and a frame ceiling board 22 that are arranged opposite to each other in a vertical direction with a predetermined interval, and these are coupled via a plurality of frame columns 23.

  The press device 1 includes a ram cylinder portion 300 supported by the frame base 21. The ram cylinder unit 300 includes a cylinder 310 having a substantially cylindrical shape with an upper end surface opened and a lower end surface closed. A substantially cylindrical ram 320 that can move up and down while sliding on the inner wall surface of the cylinder 310 is accommodated in the cylinder 310. A hydraulic pump is connected to the controller of the press apparatus 1 (not shown). The controller moves the ram 320 up and down relative to the cylinder 310 by driving the hydraulic pump to pressurize or depressurize the hydraulic oil in the cylinder 310.

  The press apparatus 1 includes a lower heating platen 100 supported by the ram cylinder unit 300. The lower heating platen 100 is formed by laminating a table surface plate 110, a heat insulating plate 120, and a lower heating plate 130 in order from below, and fixing them together. The lower heating platen 100 is joined to the front end surface of the ram 320 at the lower surface of the table surface plate 110 and is fixed to the ram 320. The lower heating platen 100 moves up and down together with the ram 320 in accordance with the hydraulic control in the cylinder 310 by the controller. That is, the lower heating platen 100 is supported by the press frame 2 via the ram cylinder part 300 so as to be movable up and down.

  The press device 1 includes an upper heating platen 200 supported by the frame ceiling board 22. The upper heating platen 200 is formed by laminating a crown surface plate 210, a heat insulating plate 220, and an upper heating plate 230 in order from the top and fixing them together. The lower surface of the upper hot plate 230 is a press surface, and is disposed to face the upper surface of the lower hot plate 130 that is a press surface on the lower hot platen 100 side.

  By the way, the press apparatus 1 of this embodiment is not provided with a vacuum chamber necessary for evacuating the atmosphere around the workpiece P. In this embodiment, by using the vacuum press frame 50 instead of the vacuum chamber, voids in the press-formed product can be suppressed.

  FIG. 2 is an exploded perspective view showing the configuration of the vacuum press frame 50. 3A is a top view of the vacuum press frame 50, and FIG. 3B is a cross-sectional view taken along line AA in FIG. 3A. As shown in FIG. 2 or FIG. 3, the vacuum press frame 50 includes an upper elastic sheet member 51 and a lower elastic sheet member 52. The upper elastic sheet member 51 and the lower elastic sheet member 52 are formed of a flexible resin such as silicon rubber. In the present embodiment, the lower surface (upper facing surface 51a) of the upper elastic sheet member 51 has a planar shape, while the upper surface (lower facing surface 52a) of the lower elastic sheet member 52 facing the upper facing surface 51a has a planar shape. is not. Specifically, the lower facing surface 52a has a shape in which the central region 52C falls in a concave shape with respect to the peripheral region 52P. Therefore, when the upper elastic sheet member 51 and the lower elastic sheet member 52 are overlapped, the substantially closed space CS is defined by the upper facing surface 51a and the lower facing surface 52a (see FIG. 3). ).

  As shown in FIG. 3, the upper elastic sheet member 51 and the lower elastic sheet member 52 are arranged on one side (in FIG. 3A) so that the upper facing surface 51a and the lower facing surface 52a open in a booklet shape. The sides having the joining region 54 indicated by hatching are joined by welding or the like. As shown in FIG. 3B, the workpiece P is mounted on the central region 52C when the vacuum press frame 50 is in a double-spread state (a state in which the upper elastic sheet member 51 is indicated by a two-dot chain line). Placed. The workpiece P placed on the central region 52C is obtained by changing the vacuum press frame 50 from the double-open state to the closed state (in FIG. 3B, the upper elastic sheet member 51 is indicated by a solid line). Is stored in the closed space CS.

  Thus, in this embodiment, when the upper elastic sheet member 51 is opened with respect to the lower elastic sheet member 52, the workpiece P can be placed on the central region 52C, and the upper elastic sheet member 51 is closed. The workpiece P placed on the central region 52C can be accommodated in the closed space CS. That is, the workpiece P can be accommodated in the closed space CS through a simple operation of opening and closing the upper elastic sheet member 51.

  A support groove 52V is formed in the lower facing surface 52a. The support groove 52V is formed so as to cross one side of the peripheral region 52P including the bonding region 54. One end of a vacuum pipe 53 is fixed to the support groove 52 </ b> V by welding the upper elastic sheet member 51 and the lower elastic sheet member 52. The vacuum pipe 53 is a pipe for degassing the inside of the closed space CS, and the other end is detachably connected to a vacuum pump not shown. In the middle of the vacuum pipe 53, a backflow prevention mechanism 53a such as a check valve for preventing a backflow of air from the vacuum pump side to the closed space CS side is attached. The closed space CS is in a sealed state because the gap between the support groove 52V and the vacuum pipe 53 is filled by the deformation of the upper elastic sheet member 51 and the lower elastic sheet member 52 by welding. Therefore, outside air does not flow in through the support groove 52V.

  FIG. 4A to FIG. 4C are diagrams for explaining a method for manufacturing a press-formed product, in which the workpiece P is hot press-molded using the vacuum press frame 50. As shown in FIG. 4A, the vacuum press frame 50 in which the workpiece P is accommodated in the closed space CS is placed on a metal carrier plate M such as stainless steel. The carrier plate M is a jig that is used supplementarily to smoothly convey the vacuum press frame 50 having low rigidity to the upper surface (press surface) of the lower hot plate 130.

  When the vacuum press frame 50 is placed on the carrier plate M and the vacuum pipe 53 is connected to the vacuum pump, the vacuum pump is driven and the inside of the closed space CS is deaerated through the vacuum pipe 53. Since the inside of the closed space CS is degassed and a pressure difference from the atmospheric pressure around the vacuum press frame 50 is generated, as shown in FIG. 4B, the upper facing surface 51a and the lower facing surface 52a. And the upper elastic sheet member 51 (actually the lower elastic sheet member 52) is elastically deformed so that they are adsorbed directly or via the workpiece P. Deaeration in the closed space CS is performed until the inside of the closed space CS reaches a predetermined degree of vacuum.

  After the deaeration process, when the vacuum pipe 53 is removed from the vacuum pump, the carrier plate M on which the vacuum press frame 50 is placed is transferred to the upper surface (press surface) of the lower hot plate 130 by a transfer device such as a loader. Placed. The backflow prevention mechanism 53a prevents outside air from flowing into the closed space CS through the vacuum pipe 53 removed from the vacuum pump. Further, when there is a possibility that the degree of vacuum may change greatly due to generation of gas or the like from the workpiece P during hot press molding, the vacuum pipe 53 and the vacuum pump are not removed, and the closed space CS is also used during hot press molding. May be degassed.

  Each heating plate of the lower heating plate 130 and the upper heating plate 230 is provided with well-known heating means (for example, an electric heater) (not shown). The press surface of each hot plate is raised and maintained up to the molding temperature of the resin material constituting the workpiece P (for example, the thermosetting temperature in the case of a thermosetting resin) by the operation of the temperature adjustment unit. With the press surface of each hot plate maintained at a predetermined molding temperature, the hydraulic pump is driven to drive the lower hot plate 130 upward, and the vacuum press frame 50 placed on the lower hot plate 130 and By sandwiching the carrier plate M between the lower hot plate 130 and the upper hot plate 230, the upper elastic sheet member 51 and the lower elastic sheet member 52 are flexibly deformed so that the press pressure is applied to the workpiece P. Then, the workpiece P in the vacuum press frame 50 (closed space CS) is hot-press molded (see FIG. 4C). At this time, since the workpiece P is placed under vacuum in the vacuum press frame 50, voids in the press-formed product are suppressed.

  Thus, the vacuum press frame 50 can place the workpiece P under vacuum. Therefore, the press apparatus 1 of this embodiment does not require a vacuum chamber. Moreover, since the vacuum volume of the vacuum press frame 50 is large enough to accommodate the workpiece P, a large vacuum pump having a high exhaust capacity is unnecessary. Therefore, the press device 1 can be reduced in size, and the cost, maintenance cost, power consumption, etc. of the press device 1 can be suppressed. Moreover, since the vacuum volume is small, evacuation can be completed in a short time, and the process time of the vacuum press can be greatly shortened.

  The upper elastic sheet member 51 and the lower elastic sheet member 52 are deformed flexibly in response to loads from the hot plates of the lower hot plate 130 and the upper hot plate 230 during hot press molding, thereby The load is evenly transmitted to the entire processing surface of the workpiece P. That is, the vacuum press frame 50 also serves as a cushion member for hot pressing. From another viewpoint, the vacuum press frame 50 can also be expressed as a hot press cushion member to which a function of a vacuum chamber is added.

  Since the vacuum pipe 53 does not hinder hot press molding by the two hot platens, the two hot platens and the machine are placed with the vacuum press frame 50 placed on the upper surface (press surface) of the lower hot plate 130. It is installed in a position where it is difficult to interfere. Specifically, the vacuum press frame 50 is formed to be larger than the press area where the lower hot plate 130 and the upper hot plate 230 can press, and the vacuum pipe 53 is formed as shown in FIG. ), The vacuum press frame 50 is placed on the upper surface (press surface) of the lower hot plate 130 and is placed in the support groove V so as to be located outside the press region. .

  The above is the description of the exemplary embodiments of the present invention. The embodiments of the present invention are not limited to those described above, and can be arbitrarily changed within the scope of the technical idea expressed by the description of the scope of claims. For example, the press device of the present embodiment is a type that hot press-molds a workpiece with a pair of hot platens, but the press device of another embodiment enables a large number of press-formed products to be manufactured at a time. Therefore, a multi-stage type in which a plurality of hot platens are arranged in the stacking direction may be used.

  Further, the shapes of the upper facing surface 51a and the lower facing surface 52a are not limited to the shapes of the present embodiment. For example, the lower facing surface 52a may have a planar shape, and the upper facing surface 51a may have a shape in which the central region falls in a stepped manner with respect to the peripheral region (hereinafter referred to as a “concave surface”). Moreover, in order to hot press-mold the thick workpiece P, both the upper facing surface 51a and the lower facing surface 52a may be concave surfaces.

DESCRIPTION OF SYMBOLS 1 Press apparatus 2 Press frame 21 Frame base 22 Frame ceiling board 23 Frame support 50 Vacuum press frame 51 Upper elastic sheet member 51a Upper opposing surface 52 Lower elastic sheet member 52a Lower opposing surface 52C Central region 52P Peripheral region 52V Support Groove 53 Vacuum piping 53a Backflow prevention mechanism 54 Joining area 100 Lower heat plate body 110 Table surface plate 120 Heat insulation plate 130 Lower heat plate 200 Upper heat plate body 210 Crown surface plate 220 Heat insulation plate 230 Upper heat plate 300 Ram cylinder section 310 Cylinder 320 Ram CS Closed space M Carrier plate

Claims (7)

A vacuum press frame placed on a press panel of a press device,
A pair of plate-like members in which a part of at least one of the opposing surfaces falls into a concave shape so as to form a closed space in which workpieces are accommodated when they are overlapped with each other;
A vacuum pipe having one end communicating with the closed space and the other end connected to a predetermined vacuum pump;
With
The frame for a vacuum press, wherein the pair of plate-like members can be deformed so that a pressing pressure is transmitted to a workpiece in the closed space when pressed by the press board.   The frame for a vacuum press according to claim 1, wherein the pair of plate-like members are elastic sheet members having flexibility.   The vacuum press frame according to claim 1 or 2, wherein a backflow prevention mechanism for preventing a backflow of air from the vacuum pump side to the closed space side is attached to the vacuum pipe. body. The pair of plate-like members are formed larger than a press area where the press plate can press the workpiece,
4. The vacuum pipe according to any one of claims 1 to 3, wherein the vacuum pipe is disposed so as to be located outside the press area when the vacuum press frame is placed on the press board. A frame for a vacuum press according to claim 1.   The vacuum according to any one of claims 1 to 4, wherein the pair of plate-like members are fixed to each other such that the opposing surfaces of the pair of plate-like members open in a booklet shape. Press frame. A method for producing a press-formed product, wherein the workpiece is press-molded using the vacuum press frame according to any one of claims 1 to 5,
A workpiece placement step of placing the workpiece on a region of the facing surface that defines the closed space;
An accommodation step of accommodating the workpiece in the closed space by overlapping the pair of plate-like members;
A deaeration step of driving a predetermined vacuum pump connected to the vacuum pipe and degassing the closed space via the vacuum pipe;
A frame body placing step of placing the vacuum press frame body after degassing on a press panel of a press device;
A press molding step of pressing the workpiece together with the vacuum press frame mounted on the press board to mold the workpiece;
A method for producing a press-formed product, comprising: The method for manufacturing a press-formed product according to claim 6, comprising a step of removing the vacuum pipe and the vacuum pump after the degassing step and before the press forming step.

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