JP2003311494A - Press and cushion member therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a press which causes little failure such as a lowering in accuracy in the thickness direction of a work without causing prolonging of a press forming time, and a cushion member for the press disposed between hot plates of the press and the work, regarding the press and a pressing method for forming the work by hot pressing it. <P>SOLUTION: At least one cushion member 150 disposed between the pair of hot plates of the press is composed to have two metal plates 150a placed approximately in parallel and a heating medium 150b sealed between the metal plates. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press device for hot-pressing and forming a work piece, and a cushion member for the press device arranged between a hot plate of the press device and the work piece.

[0002]

2. Description of the Related Art Conventionally, for example, a plastic IC card (integrated circuit card)
BACKGROUND ART A press machine for molding a work piece made of plastic is used for manufacturing a printed wiring board (PWB) and the like. In such a press machine, a workpiece mainly made of resin is placed between two heating plates, and the two heating plates press the workpiece while heating it (thermal compression step), thereby processing the workpiece. It is for molding a product.

When a printed wiring board having a thickness of 100 μm or less is molded using such a press machine, the pressing pressure applied to the product depends on the position of the hot platen unless the flatness accuracy of the hot platen is kept within 10 μm. There is a possibility that a different phenomenon occurs, the accuracy in the thickness direction of the printed wiring board deteriorates, and the press pressure is insufficient depending on the position to be pressed, and the adhesion between the copper foil and the prepreg may not be successful.

[0004]

In recent years, in order to manufacture a large number of molded products with one press, a press machine equipped with a large heating plate has come to be used. The larger the area of the hot platen, the more difficult it is to secure the flatness accuracy of the hot platen, so it is easy to cause problems such as a decrease in accuracy in the thickness direction of the printed wiring board and a poor adhesion between the copper foil and the prepreg. .

In order to avoid such a phenomenon, conventionally, a material, such as kraft paper, which has a small surface roughness and has little influence on the surface accuracy of the other surface even if one surface is slightly deformed is used as the cushion material. It was sandwiched between the work piece and the hot platen. However, a material suitable for such a cushion material is
Since the thermal conductivity is extremely lower than that of the hot platen, it is difficult for the heat of the hot plate to be transmitted to the prepreg that is the workpiece, and there is a problem that the molding time is extended.

[0006]

SUMMARY OF THE INVENTION In view of the above problems, the present invention causes problems such as a decrease in accuracy in the thickness direction of a printed wiring board and a defective adhesion between a copper foil and a prepreg even when a large heating plate is used. An object of the present invention is to provide a pressing device that is difficult and does not extend the molding time, and a cushion member that is arranged between the hot plate of the pressing device and the workpiece.

[0007]

In order to solve the above-mentioned problems, the pressing apparatus of the present invention has at least one cushion member arranged between a pair of heating plates, and the cushion members are arranged substantially parallel to each other. It has two metal plates arranged and a heat medium enclosed between the metal plates.

Since the cushion member is interposed between the hot platen and the workpiece, the metal plate on the cushion member side is pressed against the other hot platen while keeping its planar shape. As a result, the flatness accuracy of the metal plate depends only on its surface roughness, so by suppressing the surface roughness of the metal plate to a low level by mirror finishing, etc.
It is possible to maintain high flatness accuracy of the metal plate when the work piece is hot-pressed. Therefore, when the printed wiring board is pressed by such a pressing device, problems such as a decrease in accuracy in the thickness direction of the printed wiring board and a defective adhesion between the copper foil and the prepreg do not occur. In addition, the metal plate is quickly heated by the heating medium, so that the molding time is not extended.

A metal first intermediate plate may be provided between the cushion member and the workpiece. With such a configuration, since the workpiece and the cushion member do not directly contact with each other, the surface roughness of the metal plate of the cushion member is less likely to deteriorate. Therefore, the life of the cushion member can be extended.

Further, preferably, the heat medium is an incompressible heat medium. Further, the heat medium is preferably heat medium oil. This type of heat transfer oil maintains its liquid state even when heated to the molding temperature of the work piece, preventing the heat transfer medium from evaporating and having compressibility and causing the metal plate to bend. can do.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing a basic configuration of a press section 1 of a press device according to the first embodiment of the present invention. In the following description, “upper” and “lower” are defined as shown in FIG. 1, but the structure of the press unit 1 may be upside down.

The press section 1 includes a press frame 3, an upper heating plate section 100, a lower heating plate section 200, and a cylinder section 300.
Have. The press frame 3 is rigidly supported by the base of the press device installation section. Fixed platen 2 of lower hot platen 200
10 is fixed on the base portion 3b of the press frame 3. The cylinder portion 300 is fixed to the lower surface of the ceiling portion 3 a of the press frame 3.

The cylinder portion 300 includes a cylinder 310,
It has 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 bored in the center of the lower surface of the cylinder 310, and the shaft 330 moves up and down while sliding on the through hole 311 as the piston 320 moves up and down. The movable platen 110 of the upper heating platen 100 is fixed to the lower end of the shaft 330.

The cavity 340 of the cylinder 310 is moved by the piston 320 into a cavity (upper) 341 and a cavity (lower).
It is divided into 342. The cavity (upper) 341 and the cavity (lower) 342 are filled with hydraulic oil. In addition, this cavity (top) 341 and cavity (bottom)
342 is connected to the hydraulic pump 4. Hydraulic pump 4
Is connected to the controller 8. The controller 8 drives the hydraulic pump to pressurize one of the hydraulic oils injected into each of the cavity (upper) 341 and the cavity (lower) 342 and depressurize the other. Thereby, the piston 320 can be freely moved up and down. Therefore, the controller 8 controls the hydraulic pump 4 to move the upper heating plate 100 up and down.

The upper heating plate 130 of the upper heating plate 100 is suspended and fixed from the lower surface of the movable plate 110 via a heat insulating material 120. Similarly, the lower heating plate 230 of the lower heating plate unit 200 is fixed to the upper surface of the fixed plate 210 via the heat insulating material 220. Further, the lower surface of the upper heating plate 130 of the upper heating plate 100 and the upper surface of the lower heating plate 230 of the lower heating plate 200 are the top plate 140 and the carrier plate 24, respectively.
It is covered with 0.

By driving the hydraulic pump to drive the upper heating plate 100 downward, the printed wiring board 2 placed on the carrier plate 240 of the lower heating plate 200.
Can be pressed between the carrier plate 240 of the hot platen 200 and the top plate 140 of the upper hot platen 100. In the present embodiment, a plurality of printed wiring boards 2 are vertically stacked with an intermediate plate 400, which is a thin plate made of stainless steel, being formed, and a plurality of printed wiring boards 2 are formed by one pressing operation. ing.

An upper cushion member 150 is placed on the uppermost intermediate plate 400. Similarly, a lower cushion member 250 is placed below the lowermost intermediate plate 400. These cushion members include the top plate 140 and the carrier plate 24.
It absorbs 0 distortion and inclination. Both surfaces of the cushion member are mirror-finished. As a result, during pressing, the uppermost and lowermost intermediate plates 400 maintain a high flatness and a horizontal state. The structures of the upper cushion member 150 and the lower cushion member 250 will be described later.

Both surfaces of the intermediate plate 400 are mirror-finished, and the surface roughness thereof is within several μm. Therefore, if the flatness of the uppermost and lowermost intermediate plates 400 is maintained, the flatness accuracy of both surfaces of the intermediate plate 400 is maintained within 10 μm.

While pressing the printed wiring board 2,
The upper heating plate 130 and the lower heating plate 2 of the upper heating plate 100
The lower heating plate 230 of No. 00 is heated by the heater 5 to the molding temperature of the prepreg of the printed wiring board 2. The method of heating the heating plate by the heater 5 will be described later. In this way, the copper foil of the printed wiring board 2 is bonded to the prepreg by a so-called heat compression step of pressing the printed wiring board 2 while heating. In the embodiment of the present invention, the printed wiring board 2 having a thickness of 86 μm in which both surfaces of a prepreg having a thickness of 50 μm are covered with copper foil having a thickness of 18 μm is pressed.

FIG. 2 shows the upper heating plate 13 of the upper heating plate portion 100.
It is sectional drawing which cut | disconnected 0 in the horizontal direction. The lower heating plate 230 of the lower heating plate 200 and the upper heating plate 130 of the upper heating plate 100 are members having the same shape.

The upper heating plate 130 is a substantially square steel plate. In the upper hot platen 130, first holes 131a to 131h that are eight through holes that are parallel to each other and are formed in the vertical direction in FIG.
(131a, 131b, 13 in order from the left side in FIG.
1c, 131d, 131e, 131f, 131g, 13
1h), and the first hot plate 130 is provided at the lower end of FIG.
2 so as to be orthogonal to all of the holes 131a to h of FIG. 2 and the first hole 131a to f of the upper heating plate 130 from the left side of the upper end in FIG. A third hole 133 that is drilled in the left-right direction in FIG. 2 and a fourth hole that is drilled in the left-right direction in FIG. 2 so as to be orthogonal to the first holes 131g and 131h from the right side of the upper end portion of the upper heating plate 130 in FIG. Holes 134 are formed. First hole 131
Blind caps 136 are fitted on both ends of b to g, respectively. The first holes 131a and 131h are shown in FIG.
The blind cap 136 is fitted only in the upper middle portion. Further, of the second hole 132, both ends, a portion between the first holes 131a and 131b, a portion between the first holes 131c and 131d, a portion between the first holes 131e and 131f, and A blind cap 136 is fitted in each of the portions between the holes 131g and 131h. A blind cap 136 is fitted in each of the left end of the third hole 133, the portion between the first holes 131b and 131c, and the portion between the first holes 131d and 131e. A blind cap 136 is fitted on the right end of the fourth hole 134. The first holes 131a to h, the second holes 132,
By inserting the blind cap 136 into each of the third hole 133 and the fourth hole 134 as described above,
The holes 131a to h, the second hole 132, the third hole 133, and the fourth hole 134 have the lower end 138 of the first hole 131a and the lower end 139 of the first hole 131h as both ends, and the upper hot platen 1
It functions as a single heating medium pipe line that meanders in 30.

A heater 5 (FIG. 1) is provided in the heating medium line for heating.
The heat carrier oil heated by is circulated by the pump 6 (FIG. 1), and the heat carrier oil heats the upper heating plate 130. A temperature sensor (not shown) is attached to the upper heating platen 130. This temperature sensor is connected to the controller 8 (Fig. 1) of the press machine,
When the pressing device presses the printed wiring board 2, the controller 8 sets the heater 5 so that the temperature of the upper heating plate 130 measured by the temperature sensor is around 200 degrees which is the molding temperature of the prepreg of the printed wiring board 2. Is controlled to adjust the temperature of the heat transfer oil flowing in the pipe.

FIG. 3 is a vertical sectional view of the peripheral portion of the upper cushion member 150 when the printed wiring board 2 is pressed. The structure of the lower cushion member 250 is similar to that of the upper cushion member 150.
The upper cushion member 150 has two metal plates 150a made of stainless steel which are parallel to each other. Both metal plates 150a are welded at their ends 150c all around and joined to each other, and the space 150b between both metal plates 150a is completely sealed from the outside. This space 150
Heat transfer oil is sealed in b without any gap.

Since the upper cushion member 150 is constructed as described above, even if the top plate is slightly distorted or tilted, the distortion or tilt is absorbed by the heat transfer oil which is a fluid. . Since the heat transfer oil uniformly presses the metal plate 150a, the lower metal plate 150a of the upper cushion member 150 is pressed against the uppermost intermediate plate 400. Therefore, the lower metal plate 150a maintains a flat state with high accuracy.

Similarly, the upper metal plate of the lower cushion member 250 is pressed against the lowermost intermediate plate 400, and the upper metal plate of the lower cushion member 250 maintains a flat state with high accuracy.

The heat transfer oil enclosed in the upper cushion member 150 is transferred from the upper heating plate 130 to the top plate 1.
The heat reaching the upper metal plate 150a of the upper cushion member 150 via 40 is quickly transmitted to the lower metal plate. Therefore, the uppermost intermediate plate 40
0 heats up quickly. Similarly, the heat medium oil sealed in the lower cushion member 250 quickly heats the lowermost intermediate plate 400.

As described above, according to the pressing apparatus of this embodiment, the flatness accuracy of both surfaces of the intermediate plate 400 is 10 μm.
Since it is maintained with a high accuracy of m, problems such as a decrease in accuracy in the thickness direction of the printed wiring board and a defective adhesion between the copper foil and the prepreg do not occur. Further, the upper cushion member 150
And the heat transfer oil enclosed in the lower cushion member 250 allows the upper heat plate 130 and the lower heat plate 23 to be quickly heated.
Since heat of 0 is transferred to the printed wiring board 2, molding can be performed in a short time.

In the present embodiment described above, the upper cushion member 150 and the lower cushion member 250 are members in which the ends of two metal plates are welded all around and the heat medium oil is sealed inside. However, the present invention is not limited to the above-described configuration, and another configuration in which a member including two substantially parallel metal plates and a heat medium sealed between both metal plates is used as a cushion member is also possible. Is. The pressing device according to the second embodiment of the present invention is a pressing device using such a cushion member. The configuration of the present embodiment other than the cushion member is the same as that of the first embodiment of the present invention, and thus the description thereof is omitted. Also,
In the following description, the same members as those in the first embodiment of the present invention are designated by the same reference numerals.

FIG. 4 is a vertical sectional view of the peripheral portion of the upper cushion member 1150 when the printed wiring board 2 is being pressed. The upper cushion member 1150 includes two stainless steel metal plates 1150 parallel to each other.
a. An annular frame member 1150c whose horizontal dimension is slightly smaller than the horizontal dimension of the metal plate 1150a is inserted between both metal plates 150a. The frame member 1150c guides the two metal plates 1150a so that the two metal plates 1150a are in equilibrium with each other being separated by about several millimeters. The frame member 1150c and both metal plates 1150a are welded at their abutting portions 1150d all around and joined to each other.
Space 1150b formed by 50a and frame member 1150c
Is completely sealed from the outside. The heat transfer oil is enclosed in this space 1150b without any gap.

Therefore, according to this embodiment, as in the case of the first embodiment of the present invention, even if the top plate is slightly distorted or tilted, the distortion or tilt is a fluid. It is absorbed by heat transfer oil. Since the heat transfer oil uniformly presses the metal plate 1150a, the lower metal plate 1150a of the upper cushion member 1150 is pressed against the uppermost intermediate plate 400. Therefore, the lower metal plate 1150a maintains a flat state with high accuracy.

Further, the heat transfer oil sealed in the upper cushion member 1150 quickly lowers the heat that has reached the upper metal plate 1150a of the upper cushion member 1150 from the upper heating plate 130 via the top plate 140. To the metal plate 1150a. Therefore, the uppermost intermediate plate 400 is quickly heated.

Further, according to this embodiment, both metal plates of the cushion member are kept substantially parallel to each other over a wide area guided by the frame member, so that the metal plate on the printed wiring board 2 side is the same as that of the first embodiment. The plane state is maintained with the above accuracy.

As described above, according to the present embodiment, even if the top plate is slightly distorted or tilted, the flatness accuracy of both surfaces of the intermediate plate is kept as high as 10 μm. Also, problems such as a decrease in accuracy in the thickness direction of the printed wiring board and a defective adhesion between the copper foil and the prepreg do not occur. Further, the heat transfer oil enclosed in the upper cushion member and the lower cushion member quickly transfers the heat of the upper heating plate 130 and the lower heating plate 230 to the printed wiring board 2, which enables molding in a short time. Become.

[0034]

As described above, according to the pressing apparatus and the pressing method of the present invention, problems such as a decrease in accuracy in the thickness direction of the workpiece are less likely to occur, and the molding time is not extended.

[Brief description of drawings]

FIG. 1 is a side view showing a basic configuration of a press section of a press device according to a first embodiment of the present invention.

FIG. 2 is a horizontal sectional view of a heating plate of the pressing device according to the first embodiment of the present invention.

FIG. 3 is a vertical cross-sectional view around a cushion member of the pressing device according to the first embodiment of the present invention.

FIG. 4 is a vertical sectional view around a cushion member of a pressing device according to a second embodiment of the present invention.

[Explanation of sign]

1 Press Department 2 printed wiring board 8 controller 130 Upper heating plate 140 top plate 150 Upper cushion member 150a metal plate 400 Intermediate plate 1150 Upper cushion member 1150a Metal plate 1150c Frame member

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification symbol FI theme code (reference) B29L 9:00 B29L 9:00 F term (reference) 4E088 EA03 4E090 AB01 BA01 CA01 DA01 4F204 AB25 AD03 AD16 AG03 AH36 AM32 FA01 FB01 FB13 FN11 FN15 FQ08 FQ10 FQ17

Claims (18)

[Claims] 1. At least one pair of hot plates that heat-compresses a workpiece to sandwich it, and at least one cushion member that is arranged between the pair of hot plates, wherein the cushion member is substantially A press device comprising two metal plates arranged in parallel and a heat medium enclosed between the metal plates. 2. The press device according to claim 1, wherein the end portions of the two metal plates are welded to each other all around. 3. The spacer member according to claim 1, further comprising a spacer member interposed between the two metal plates to maintain a distance between the two metal plates at a predetermined distance. Press machine. 4. The spacer member is an annular member, the heat medium is enclosed in a space surrounded by the inner periphery of the spacer member and the two metal plates, and the spacer member and the two metal plates. The press device according to claim 3, wherein the press device is welded all around the plate. 5. The pressing device according to claim 1, wherein the pressing device has two cushion members, and the workpiece is sandwiched between the two cushion members and heat-pressed. The pressing device according to any one of the above. 6. The pressing device according to claim 1, wherein the metal plate of the cushion member on the side of the workpiece is mirror-finished. 7. The first intermediate plate made of metal is interposed between the cushion member and the workpiece, and the first intermediate plate is made of metal. Press equipment. 8. The press device according to claim 7, wherein the first intermediate plate is mirror-finished. 9. The press device is a multi-stage press device capable of simultaneously pressing a plurality of workpieces that are superimposed in the pressing direction, and a metal second member is provided between the plurality of workpieces.
The press device according to any one of claims 1 to 7, characterized in that the intermediate plate (1) is interposed. 10. The press device according to claim 9, wherein the second intermediate plate is mirror-finished. 11. The press device according to claim 1, wherein the heat medium is a non-compressible heat medium oil. 12. The press device according to claim 1, wherein the work piece is a printed wiring board. 13. A cushion member arranged between a hot platen of a pressing device and a work piece, the two metal plates being arranged substantially in parallel, and a heat medium sealed between the metal plates. A cushion member for a press device, comprising: 14. The cushion member for a press device according to claim 13, wherein the end portions of the two metal plates are welded to each other around the entire circumference. 15. A spacer member is interposed between the two metal plates to maintain a distance between the two metal plates at a predetermined distance.
The cushion member for a press device according to item 3. 16. The spacer member is an annular member, and the heat medium is enclosed in a space surrounded by the inner circumference of the spacer member and the two metal plates, and the spacer member and the two metal plates. The cushion member for a press device according to claim 15, wherein the cushion member is welded to the entire circumference of the plate. 17. The cushion member for a press device according to claim 13, wherein a metal plate of the cushion member on the side of the workpiece is mirror-finished. 18. The cushion member for a press device according to claim 13, wherein the heat medium is an incompressible heat medium oil.