JP2010105044A - Press machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a press machine which can prevent the breakage of a heat insulating material caused by collision with the other member. <P>SOLUTION: The press machine 1 comprises: a pair of surface plates 110, 210 driven so as to be approached/separated each other; hot plates 130, 230 fitted to the respective press faces confronted each other in the pair of surface plates 110, 210; heat insulating materials 120, 220 with a thick plate shape inserted between the surface plate and the hot plate; a frame body provided at the surface plate so as to limit the movement of the heat insulating material on the press; and a metal cover fitted to the heat insulating material so as to cover at least the side face of the heat insulating material. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  According to the present invention, a pair of surface plates, to which a heating plate is fixed via a heat insulating material, are driven in a direction to bring them close to each other, and a workpiece placed between the heating plates is heated and pressed to form. The present invention relates to a press device.

  In order to form a workpiece such as a printed wiring board, a press apparatus that presses the workpiece between a pair of hot plates to heat and pressurize is widely used. Such a press device fixes a hot platen to each of a pair of platens, drives one platen close to the other by a hydraulic cylinder, etc., and presses a work piece between the hot plates. I do.

  The hot platen is heated to a predetermined temperature that is equal to or higher than the molding temperature of the resin material constituting the workpiece. When the heat of the hot platen moves to the platen and the temperature of the platen rises, the platen and the frame that supports the platen are distorted and warped, and the flatness accuracy of the hot platen and the parallel of the hot plates Accuracy may be degraded. Since these deteriorations in accuracy also affect the accuracy of the workpiece, it is desirable to prevent the heat from the hot plate from being transmitted to the surface plate as much as possible. For this purpose, a heat insulating material is sandwiched between the surface plate and the heat plate so that the heat of the heat plate is hardly conducted to the surface plate.

  As described above, since the heat conduction from the hot platen to the surface plate hardly occurs, the temperature difference between the hot platen and the surface plate increases when the workpiece is pressed. Since the hot platen is generally made of a metal material having a large linear expansion coefficient such as steel, the amount of deformation due to the thermal expansion of the heated hot platen is large. On the other hand, since the surface plate is not heated so much, the deformation amount of the surface plate at this time is small. As a result, when the hot platen is heated, the region in contact with the hot platen of the heat insulating material is dragged by the hot platen, while the region in contact with the surface plate hardly moves. For this reason, a large shear stress is generated inside the heat insulating material, and the heat insulating material may be damaged.

  In order to prevent breakage of the heat insulating material due to such shear stress, a configuration as described in Patent Document 1 has been proposed. In this configuration, the heat insulating material is coated with a low-friction material such as porous fluororesin on both surfaces that contact the surface plate and the heat plate so that the heat insulating material can slide against the surface plate and the heat plate. Yes. Since the heat insulating material slides with respect to the surface plate and the heat platen, the magnitude of the shear stress inside the heat insulating material is greatly reduced, and damage to the heat insulating material due to the shear stress is prevented.

JP-A-7-112300

  In the configuration where the heat insulating material can move in the surface direction between the surface plate and the heat plate as in the above configuration, the heat insulating material moves so that the heat insulating material does not jump out between the surface plate and the heat platen. It is preferable that a frame body that regulates is provided on the surface plate, and a heat insulating material is disposed in the frame body. However, in such a configuration, there is a possibility that the heat insulating material collides with the frame body due to the movement of the heat insulating material, breaks the heat insulating material and scatters in the press apparatus, and affects the molding of the workpiece.

  The present invention has been made to solve the above problems. That is, an object of the present invention is to provide a press device capable of preventing breakage due to collision of the heat insulating material with other members.

  In order to achieve the above object, a press apparatus according to the present invention includes a pair of surface plates that are driven so as to approach and separate from each other, a hot platen that is attached to each of the press surfaces facing each other of the pair of surface plates, and a surface plate. Covering at least the side surface of the heat insulating material, the thick plate-shaped heat insulating material sandwiched between the panel and the heat plate, the frame provided on the surface plate to limit the movement of the heat insulating material on the press surface And a metal cover attached to the heat insulating material.

  In the press device of the present invention, since at least the side surface of the heat insulating material is protected by the metal cover, even if the heat insulating material slides between the heat platen and the surface plate and the side surface of the heat insulating material collides with another member. The insulation is not damaged.

FIG. 1 is a front view of a press apparatus according to an embodiment of the present invention. FIG. 2 is a perspective view of the table surface plate according to the embodiment of the present invention. FIG. 3 is a perspective view of a table surface plate to which a heat insulating unit is attached in the embodiment of the present invention. FIG. 4 is a perspective view of the heat insulating unit according to the embodiment of the present invention. FIG. 5 is a cross-sectional view taken along the line II of FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a front view of the press apparatus according to the present embodiment. As shown in FIG. 1, the press device 1 of the present embodiment includes a press frame 3, an upper heating platen part 100, a lower heating platen part 200, and a cylinder part 300. The press frame 3 is rigidly supported on the base B of the press device installation portion. The table surface plate 210 of the lower heating platen part 200 is fixed on the base part 3 b of the press frame 3. Further, the cylinder part 300 is fixed to the lower surface of the ceiling part 3 a of the press frame 3.

  The cylinder unit 300 includes a cylinder 310, a piston 320 that can move up and down while sliding on the inner wall of the cylinder 310, and a shaft 330 that extends vertically downward from the center of the lower surface of the piston 320. A through hole 311 is perforated in the center of the lower surface of the cylinder 310, and the shaft 330 moves up and down while sliding with the through hole 311 according to the vertical movement of the piston 320. A crown surface plate 110 of the upper heating platen 100 is fixed to the lower end of the shaft 330.

  The cavity portion 340 of the cylinder 310 is divided into an upper cavity portion 341 and a lower cavity portion 342 by the piston 320. Each of the upper cavity portion 341 and the lower cavity portion 342 is filled with hydraulic oil. Further, the upper cavity portion 341 and the lower cavity portion 342 are connected to a hydraulic pump (not shown). The hydraulic pump is connected to the controller of the press device 1, and the controller drives the hydraulic pump to pressurize one of the hydraulic oils injected into each of the upper cavity portion 341 and the lower cavity portion 342 and depressurize the other. Thus, the piston 320 can be freely moved up and down. Therefore, the controller can move the upper heating platen 100 fixed to the shaft 330 up and down by controlling the hydraulic pump.

  The upper heating platen 130 of the upper heating platen 100 is fixed to the lower surface side of the crown surface plate 110 via a fixing member 150, and heat insulation is provided between the lower surface of the crown surface plate 110 and the upper surface of the upper heating platen 130. The unit 120 is sandwiched. The fixing member 150 is fastened to the crown surface plate 110 and the upper heat platen 130 by bolts (not shown). Similarly, the lower heat platen 230 of the lower heat platen unit 200 is fixed to the upper surface side of the table surface plate 210 via a fixing member 250, and between the upper surface of the table surface plate 210 and the lower surface of the lower heat platen 230. The heat insulating unit 220 is sandwiched between the two.

  The upper heating platen 130 and the lower heating platen 230 incorporate temperature adjusting means (not shown). By this temperature adjustment means, the upper heating platen 130 and the lower heating platen 230 are equal to or higher than the molding temperature of the resin material constituting the workpiece P (printed wiring board or the like) (for example, the thermosetting temperature in a thermosetting resin). Maintained at a predetermined temperature. Then, in a state where the upper heating platen 130 and the lower heating platen 230 are maintained at a predetermined temperature, the hydraulic pump is driven to drive the upper heating platen unit 100 downward, so that the upper heating platen 130 and the lower heating platen 230 are placed on the lower heating platen 230. The workpiece P can be pressed while being sandwiched between the lower heating platen 230 and the upper heating platen 130.

  Next, the attachment structure of the heat insulation unit to the surface plate will be described. Since there is no difference in structure between the upper heating platen 100 side and the lower heating platen 200 side, in the following description, only the lower heating platen 200 will be described, and the description of the upper heating platen 100 will not be given. Omitted.

  A perspective view of the table surface plate 210 of the present embodiment is shown in FIG. As shown in FIG. 2, the table surface plate 210 has a lattice-shaped heat insulation in which an upper surface 211 a of a thick plate-shaped surface plate body 211 is combined with an external frame 212 a that is a square frame and a cross-shaped internal frame 212 b. A unit holding grid 212 is attached. FIG. 3 is a perspective view of the table surface plate 210 in which the heat insulating unit 220 is accommodated. In the present embodiment, as shown in FIG. 3, each of the four meshes of the heat insulation unit holding grid 212 accommodates a rectangular thermal insulation unit 220 that is slightly smaller than the mesh. Since the inner frame 212b is located between the heat insulation units 220, the heat insulation units 220 do not contact each other.

  As described above, the lower heating platen 230 is placed on the table surface plate 210 to which the heat insulating unit 220 is attached, and the fixing member 250 that connects the table surface plate 210 and the lower heating plate 230 is bolted and fixed from both sides. Accordingly, the lower heating platen 230 is integrated with the table surface plate 210. In a state where the lower heating platen 230 is fixed to the table surface plate 210, the heat insulating unit 220 is sandwiched between the table surface plate 210 and the lower heating platen 230 and does not move in the plate thickness direction.

  Next, the heat insulation unit of this embodiment is demonstrated. Since the heat insulating unit 120 of the upper heat platen unit 100 is the same as the heat insulating unit 220 of the lower heat platen unit 200, only the heat insulating unit 220 of the lower heat platen unit 200 will be described in the following description. A description of the heat insulating unit 120 of the panel unit 100 is omitted.

  FIG. 4 is a perspective view of the heat insulating unit 220 of the present embodiment. As shown in FIG. 4, the heat insulating unit 220 includes a plate-shaped heat insulating material 221 and metal covers 222 and 223 that cover the outer periphery thereof.

  The heat insulating material 221 is formed of a material having extremely low thermal conductivity such as a porous resin material. Further, the metal covers 222 and 223 are formed of a stainless steel plate whose front and back surfaces are mirror-finished in a tray shape by bending or drawing. The metal covers 222 and 223 have bottom surfaces 222 a and 223 a that cover the front and back surface portions of the heat insulating material 221, respectively, and side walls 222 b and 223 b of the cover cover the side surfaces of the heat insulating material 221.

  Further, a low friction sliding agent is applied to both the front and back surfaces of the bottom surfaces 222a and 223a of the metal covers 222 and 223. With this low friction sliding agent, the bottom surface 222a of the metal cover 222 and the lower heating plate 230, the bottom surface 222a and the upper surface of the heat insulating material 221, the bottom surface 223a of the metal cover 223 and the lower surface of the heat insulating material 221, and the bottom surface 223a and the table surface plate 210. The frictional force acting between the upper surface 210a and the upper surface 210a is reduced. In addition, instead of applying a low friction sliding agent to the back surfaces of the bottom surfaces 222a and 223a of the metal covers 222 and 223 (that is, the heat insulating material 221 side), low friction is applied to the contact surfaces of the heat insulating material 221 with the metal covers 222 and 223. A sliding agent may be applied.

  FIG. 5 is a cross-sectional view taken along the line II in FIG. 1 when each heat insulating material unit 220 is disposed at substantially the center of each heat insulating unit holding grid 212. Each size of the mesh of the heat insulation unit holding grid 212 is slightly larger than that of the heat insulation unit 220, so that a predetermined space is formed between the heat insulation unit 220 and the heat insulation unit holding grid 212.

  In the present embodiment, when the press is not performed, the temperature of the lower hot platen 230 is room temperature, and the temperature of the lower hot platen 230 is raised to a predetermined temperature immediately before the press is performed. However, even when the temperature of the lower heat platen 230 reaches a predetermined temperature, the heat insulation unit 220 is sandwiched between the lower heat platen 230 and the table surface plate 210, so that the heat of the lower heat platen 230 is It is not transmitted directly to the table surface plate 210. Accordingly, the temperature of the table surface plate 210 is sufficiently lower than the predetermined temperature of the lower heat platen 230. As the temperature of the lower heating plate 230 rises, the lower heating plate 230 is displaced laterally with respect to the table surface plate 210 (any direction perpendicular to the thickness direction of the lower heating plate 230) due to thermal expansion. It will be.

  In the present embodiment, as described above, the friction coefficient between the heat insulating unit 220 and the lower heating plate 230 is extremely small due to the low friction sliding agent. Therefore, when the lower heating plate 230 is thermally expanded in the lateral direction, the heat insulating unit 220 slides with respect to the lower heating plate 230. In addition, the temperature of the table surface plate 210 rises to some extent due to radiation from the lower heat platen 230 and heat conduction through the heat insulation unit 220, and thermal expansion occurs. Slip. Thus, in this embodiment, since the heat insulation unit 220 slides according to the expansion of the lower heating plate 230 and the table surface plate 210, almost no shear stress is applied to the heat insulation unit 220.

  As described above, the coefficient of friction between the heat insulating unit 220 and the lower heat plate 230 and the table surface plate 210 is extremely small due to the low friction sliding agent. As the lower hot platen 230 and the table surface plate 210 expand, some frictional force is generated between the lower heat platen 230 and the table surface plate 210 and the metal covers 222 and 223 of the heat insulating unit 220. Will be added. However, even in such a case, since there is a predetermined space between the heat insulating unit 220 and the heat insulating unit holding grid 212, the heat insulating unit 220 itself can move according to the expansion of the hot platen and the surface plate. In addition, since the metal covers 222 and 223 slide with respect to the heat insulating material 221, the shear stress due to this frictional force is hardly applied to the heat insulating material 221. As described above, in the present embodiment, even when the lower heating plate 230 and the table surface plate 210 expand, friction is generated between the lower heating plate 230 and the table surface plate 210 and the metal covers 222 and 223 of the heat insulating unit 220. Even when force is applied, since the shearing stress is hardly applied to the heat insulating material 221, the heat insulating material 221 is not damaged.

  Further, even if the heat insulating unit 220 slides against the table surface plate 210 and hits the heat insulating unit holding grid 212, the heat insulating material 221 is damaged because the side surfaces of the heat insulating material 221 are protected by the metal covers 222 and 223. There is nothing.

  The direction of displacement due to thermal expansion of the lower heat plate 230 relative to the table surface plate 210 is opposite between one end side and the other end side of the surface direction of the lower heat plate 230. Therefore, the direction of the frictional force applied from the lower heating plate 230 to the heat insulating unit 220 is also opposite in the one end side and the other end side. For this reason, when there is only one heat insulating unit 220 between the lower heat platen 230 and the table surface plate 210, a large tensile stress in a direction along the surface of the lower heat platen 230 is applied to the heat insulating unit 220. On the other hand, in this embodiment, since the heat insulation unit 220 is divided into four parts, the magnitude of the tensile stress applied to each heat insulation unit 220 is reduced, and deformation and breakage of the heat insulating material 221 can be suppressed. .

  In the present embodiment, stainless steel plates are used as the materials for the metal covers 222 and 223 that cover the heat insulating material 221. However, the present invention is not limited to the above configuration, and the metal cover may be formed of other metal materials. However, since the metal cover covers the heat insulating material of the press device and is desired to be slidable without resistance between the lower heating plate 230 and the heat insulating material 221, it has a low thermal conductivity and a rough surface. It is preferable to use a small stainless steel plate.

  Moreover, although the heat insulation unit 220 is divided into 4 in this embodiment, this invention is not limited to this structure. That is, the heat insulation unit 220 may not be divided, or the heat insulation unit 220 may be divided into a number other than four.

  Moreover, in this embodiment, although the metal covers 222 and 223 are comprised so that the surface and the back surface of the heat insulating material 221 may be covered, this invention is not limited to this structure, At least of the heat insulating material 221. The side surface only needs to be protected by a metal cover. In this case, the metal cover is configured as a metal frame surrounding the side surface of the heat insulating material, and the heat insulating unit 220 is formed by press-fitting the heat insulating material 221 into the metal frame. In this case, the surface and the back surface of the heat insulating material 221 are in direct contact with the lower heating plate 230 and the table surface plate 210. However, if a low friction sliding agent is applied to the surface and the back surface of the heat insulating material 221, the heat insulating material 221 is applied. The coefficient of friction between the lower heating platen 230 and the table surface plate 210 is kept extremely low.

DESCRIPTION OF SYMBOLS 1 Press apparatus 100 Upper heating board part 110 Crown surface plate 120 Insulating material part 130 Upper heating board 200 Lower heating board part 210 Table heating board 212 Insulating material holding grid 220 Insulating material part 221 Insulating material 222 Metal cover 223 Metal cover

Claims (9)

A pair of surface plates that are driven close to and away from each other;
A heating plate attached to each of the press surfaces facing each other of the pair of surface plates;
A thick plate-shaped heat insulating material sandwiched between the surface plate and the heat plate;
A frame provided on the surface plate to limit the movement of the heat insulating material on the press surface;
A metal cover attached to the heat insulating material so as to cover at least a side surface of the heat insulating material;
Press machine.   2. The press device according to claim 1, wherein a low friction sliding agent is applied to a contact surface of the heat insulating material with each of the surface plate and the heat platen.   The press apparatus according to claim 1 or 2, wherein the metal cover further covers two surfaces of the heat insulating material facing the surface plate and the heat platen.   The press device according to claim 3, wherein a low friction sliding agent is applied to two surfaces of the metal cover facing the surface plate and the heat platen.   The press device according to claim 3 or 4, wherein a low friction sliding agent is applied to a contact surface of the metal cover with the heat insulating material.   The press apparatus according to any one of claims 1 to 5, wherein the metal cover is formed of a steel plate.   The press apparatus according to claim 6, wherein the steel sheet is a stainless steel sheet.   The press apparatus according to claim 1, wherein a plurality of heat insulating materials covered with the metal cover are arranged on the press surface on the surface plate. The press apparatus according to claim 8, wherein the frame body includes an internal frame provided between the heat insulating materials covered with the two metal covers adjacent to each other on the surface plate.

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