JPH05309676A - Hot press device - Google Patents

Abstract

PURPOSE:To provide a vacuum hot press device capable of uniformly pressing an object to be processed over the whole thereof and adaptable even to the press processing of an object to be processed partially different in thickness. CONSTITUTION:In a vacuum press device constituted so that a predetermined object to be processed is subjected to press processing between a plurality of the hot plates 22 arranged between the fixed plate and movable plate provided in the chamber covered with a vacuum case, the upper and under surfaces of each of the hot plates 22 are constituted of deformable flexible films 34, 36 and a hermetical closed chamber 40 is formed between the upper and lower flexible films 34, 36 and the support member 42 supporting the object to be processed is arranged behind the upper flexible film 34 on which the object to be processed is placed in the hermetically closed chamber 40. A supply and discharge means supplying and discharging a heat conductive medium with respect to the hermetically closed chamber to allow pressure to act on the flexible films 34, 36 is provided.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a vacuum pressing apparatus, and in particular, it is possible to apply a uniform pressure to an entire work piece, and is advantageously applied to the press work of a work piece having a partially different thickness. The present invention relates to an obtained vacuum press device.

[0002]

BACKGROUND ART Conventionally, as a kind of press device, between a plurality of hot plates arranged between a fixed platen and a movable platen,
There is known a press device that press-molds a predetermined work piece, and in recent years, in order to prevent defects such as voids in a laminated press product, the press work area is covered with a vacuum case, A vacuum press device has been proposed in which a press operation for a work piece is performed under a predetermined vacuum state. Further, such a vacuum pressing device is preferably used for press molding of, for example, a laminated printed wiring board, a laminated printed multilayer board, or a flexible laminated thin board.

Further, in such a vacuum pressing apparatus, generally, a hot plate made of a rigid material such as metal is used, and the hot plate is heated by a heating wire or the like disposed inside thereof. During press working, the work piece placed on the hot plate is supported and heated.

However, in the conventional vacuum pressing apparatus using such a hot plate, if the processing accuracy of the hot plate surface is low or deformation is caused, it is even with respect to the workpiece. Since the pressing force is not applied,
There is a problem that product quality deteriorates and causes defective products.

Further, when the thickness of the work piece is partially different, it is extremely difficult to perform uniform pressing on the entire surface, and when pressing a flexible thin plate or the like, it is prepared separately. A cushioning material or the like had to be used, and it could not always be applied advantageously.

[0006]

The present invention has been made in view of the circumstances as described above, and a problem to be solved by the present invention is that a work piece having a partially different thickness, a flexible thin plate substrate, or the like. Also, the pressing force between the hot plates is
It is an object of the present invention to provide a vacuum press device having a novel structure that can be uniformly and stably applied over the entire surface.

[0007]

In order to solve such a problem, a feature of the present invention is that a plurality of heating plates are arranged between a fixed plate and a movable plate in a chamber covered with a vacuum case. A vacuum press device configured to press a predetermined workpiece to be placed on the hot plates between the hot plates and to perform pressing under heating by the hot plates. The upper and lower surfaces of the plate are formed of bulge-deformable flexible films, a closed chamber is formed between the upper and lower flexible films, and an upper surface on which the workpiece is placed in the closed chamber. A support member for supporting the workpiece is disposed behind the flexible film on the side, and the heat transfer medium is supplied to and discharged from the sealed chamber to exert a pressure on the flexible film. It is in a vacuum press device provided with a supply / discharge means.

[0008]

In other words, in the vacuum pressing apparatus having the structure according to the present invention, since the pressing surface (upper and lower surfaces) of each hot plate is made of the flexible film, Heat plates are stacked with an object sandwiched between them, and the heat plates are constrained between the fixed platen and the movable platen, and the heat transfer medium is supplied to the closed chambers of the respective heat plates to exert pressure on the flexible membrane. By the pressing, the flexible film is pressed against the upper and lower surfaces of the workpiece, and the pressing force is exerted.

Then, at that time, the flexible film forming the pressing surface of each hot plate is deformed along the surface of the workpiece to be brought into close contact therewith. Regardless of the shape, that is, even in the case of a work piece having a partially different wall thickness or a flexible work piece, a substantially uniform pressing pressure can be effectively exerted over the entire surface thereof.

Moreover, in the vacuum pressing apparatus according to the present invention, since the pressing pressure exerted on the workpiece is determined by the pressure of the heat transfer medium supplied to the closed chamber of each hot plate, the unit It is possible to control the pressing pressure per area, and therefore, when forming multiple press stages with three or more hot plates and pressing multiple workpieces simultaneously with each press stage, Even when the size of the work piece on the press stage is different, the same pressing pressure can be applied to each work piece per unit area.

Further, in the vacuum press device according to the present invention,
Since the work piece is heated by the heat transfer medium that is supplied to and discharged from the closed chamber defined by the flexible film, the press device with the conventional structure that heats the hot plate with a heating wire or the like is used. However, it is possible to uniformly heat the entire workpiece, and particularly when a liquid having a large heat capacity is adopted as the heat transfer medium, excellent thermal efficiency can be obtained.

[0012]

The embodiments of the present invention will now be described in detail with reference to the drawings in order to clarify the present invention more specifically.

First, FIG. 1 shows a schematic configuration diagram of a vacuum multi-stage hot pressing apparatus as an embodiment of the present invention. In this figure, 10 is a press apparatus main body, in which an upper plate 12 and a lower plate 14 are arranged to face each other with a predetermined distance in the vertical direction, and fixedly connected to each other by a tie rod (not shown). Has been done. A fixed plate 16 is fixed to the lower part of the upper plate 12, while a movable plate 18 is attached to the lower plate 14 so as to face the fixed plate 16 and is provided on the lower plate 14. Hydraulic cylinder 2
With 0, the movable platen 18 is
It is designed so that it can be driven toward and away from each other.
In the figure, the hydraulic circuit of the hydraulic cylinder 20 that drives the movable plate 18 is omitted.

Further, between the fixed platen 16 and the movable platen 18, three heat plates 22 are vertically spaced apart from each other by a predetermined distance, and are supported by a support mechanism (not shown). Has been done.

Then, on the middle and lower heat plates 22,
After placing a predetermined object to be processed such as a laminated material for an electric printed wiring board, the movable platen 18 is moved toward the fixed platen 16 in an approaching direction and is pressed so that the object to be processed is moved. A hot press process is performed between the hot plates 22.

A space between the opposed surfaces of the upper plate 12 and the lower plate 14 is covered with a vacuum case 24, whereby a plurality of hot plates 22 are arranged inside to form a sealed chamber. 26 are formed.

Here, each heating plate 22 has a frame fitting 28 in the shape of a rectangular frame, as shown in FIGS. Further, upper and lower flange portions 30 and 32 projecting inward are respectively formed in a predetermined width in the upper and lower openings of the frame fitting 28 so as to be continuous in the circumferential direction.

Further, an upper rubber elastic film 34 and a lower rubber elastic film 36, which are thin plate-shaped flexible films, are provided in the upper opening and the lower opening of the frame fitting 28, respectively. There is. In addition, these rubber elastic films 34,
As 36, one having excellent heat resistance and liquid resistance to a heat transfer liquid described later is used, and, for example, fluororubber or silicone rubber is preferably used.

Then, the upper and lower rubber elastic films 34, 3
6, each of the outer peripheral portions thereof is superposed on the inner side surfaces of the upper and lower flange portions 30 and 32 of the frame fitting 28,
Further, the outer peripheral edge portion is overlapped with the inner peripheral surface of the frame fitting 28 so as to be bent. Further, a holding metal fitting 38 is provided on each of the inner peripheral surfaces of the sides of the frame metal fitting 28, and as shown in FIG.
On the other hand, it is fixed by a bolt 39. The outer peripheral edge portions of the rubber elastic films 34 and 36 are liquid-tightly pressed and held between the frame fitting 28 and the pressing fitting 38.

As a result, the upper opening and the lower opening of the frame fitting 28 are liquid-tightly covered by the upper rubber elastic film 34 and the lower rubber elastic film 36, respectively. A sealed chamber 40 having upper and lower wall portions formed of rubber elastic films 34 and 36 is defined inside the plate 22.

Further, a flat plate-shaped support plate 42 is accommodated and arranged inside the closed chamber 40, and as shown in the drawing, the outer peripheral edge portion thereof has an upper flange portion 3 of the frame fitting 28.
By being sandwiched between 0 and the holding metal fitting 38, it is disposed and supported so as to be located behind the upper rubber elastic film 34. The support plate 42 prevents the upper rubber elastic film 34 from bulging and deforming toward the closed chamber 40 side. The support plate 42 is provided with a plurality of through holes 44 penetrating in the plate thickness direction.
On both sides (upper side rubber elastic film 34 side and lower side rubber elastic film 36) of the sealed chamber 40 partitioned by the support plate 42.
The side portions are in communication with each other.

Further, in the hot plate 22 having such a sealed chamber 40 formed therein, a liquid supply port 46 and a liquid discharge port 48 are respectively provided on the peripheral wall portion of the hot plate 22 and the frame fitting 28.
And, it is formed by penetrating the pressing metal fitting 38.

Then, each heating plate 2 having such a structure
As shown in FIG. 1, a heat transfer liquid supply / discharge pipe line is connected to 2, so that the heat transfer liquid supply / discharge means passes through the liquid supply port 46 and the liquid discharge port 48. The heat transfer liquid is supplied to and discharged from the sealed chamber 40. The heat transfer liquid has a high boiling point and does not adversely affect the hot plate 22 and the like, and includes, for example, Barrel Therm # 200, # 400 (manufactured by Matsumura Oil Co., Ltd.), Sam Ace # 600, # 900 (Nippon Nippon. (Manufactured by Tetsu Kagaku Co., Ltd.) and the like can be suitably adopted.

More specifically, the heat transfer liquid supply / discharge means is provided with a pump 50, and a liquid supply for supplying the heat transfer liquid pressure-fed from the pump 50 to the closed chambers 40 of the respective heat plates 22. A liquid passage having a closed circuit structure including a pipe 52 and a liquid discharge pipe 54 that guides the heat transfer liquid discharged from the closed chamber 40 of each heating plate 22 to the pump 50 is provided. Note that FIG.
The numeral 56 is an auxiliary tank for heat transfer liquid. Then, the heat transfer liquid is made to flow through the sealed chamber 40 of each heating plate 22 by the pump 50.

On the liquid supply conduit 52, a heater 58 for heating the liquid and a cooler 60 for cooling the liquid are arranged in parallel. Then, based on the switching operation of the three-way valve 62, the heat transfer liquid is made to flow through either one of the heater 58 and the cooler 60, whereby the heat transfer liquid is supplied to the closed chamber 40 of the hot plate 22. The heat transfer liquid is heated or cooled.

Although not explicitly shown in the drawing, the liquid supply conduit 52 and the liquid discharge conduit 54 are branched by branch pipes 64 and 66, respectively, on the connection sides to the respective heat plates 22. Pipe lines for supplying and discharging the heat transfer liquid to and from each heat plate 22 are provided in parallel with each other. Further, a supply side valve 68 and a discharge side valve 70 are arranged on the supply / discharge pipe lines for the respective heat plates 22 which are provided in parallel. Thereby, the supply / discharge control of the heat transfer liquid to the closed chamber 40 of each heating plate 22 can be performed independently of each other.

The supply / discharge pipe lines connected to the respective heat plates 22 are made of flexible pipes so that movement of the heat plates 22 during press working can be permitted. ..

Further, a compressor 72 is connected to the auxiliary tank 56 via a pressurizing valve 71 so that a pressure is exerted on the heat transfer liquid contained in the auxiliary tank 56. It has become. Also, this auxiliary tank 5
The pressure applied to 6 is controlled by the pressure control valve 74. In FIG. 1, reference numeral 76 is a pressure release valve for releasing the pressure exerted on the auxiliary tank 56.

That is, by applying a pressure to the heat transfer liquid stored in the auxiliary tank 56 by the compressor 72, the liquid supply pipe line 52 and the liquid discharge pipe line 54.
The heat transfer liquid that is circulated through the pressurization is pressurized, so that the heat transfer liquid causes the closed chamber 4 of the heating plate 22 to flow.
A predetermined pressure is applied to 0.

On the other hand, the upper plate 12 of the press device body 10
Is provided with a through hole 78 that opens into the chamber 26, and the inside of the chamber 26 is connected to a vacuum pump 80 via an air suction conduit 82 connected to the through hole 78. The inside of the chamber 26 is evacuated by the operation of the vacuum pump 80.

Furthermore, in the chamber 26 of the press apparatus main body 10, the air compression pipe line 8 connected to the through hole 78 is provided.
4 to the compressor 72. Then, the pressurized air from the compressor 72 is introduced into the chamber 26, so that the inside of the chamber 26 is pressurized.

A suction side opening / closing valve 86 and a compression side opening / closing valve 88 are provided on the air suction conduit 82 and the air compression conduit 84, respectively. Based on chamber 2
Evacuation and pressurization of 6 are performed alternatively. A pressure reducing valve 90 is provided on the air compression line 84.
Is provided and is set so that the pressure in the chamber 26 becomes low. Specifically, it is set so that a pressure of about ² to 3 kg / cm ² is exerted on the chamber 26.

Then, in the press machine having such a structure, press molding is carried out as follows. In the following description of the press molding operation, in order to simplify the explanation and facilitate understanding, the fixed plate 1
It is assumed that two heat plates 22 and 22 are arranged between the movable plate 18 and the movable plate 18, and the main parts thereof are schematically shown in FIGS. 4 to 6.

First, the pressure exerted on the auxiliary tank 56 is released by the pressure relief valve 76 to make the inside of the closed chamber 40 of the heating plate 22 non-pressurized, and then the pressure valve 71 is closed and the pressure relief valve 76 is closed.
Is opened, and the compression side opening / closing valve 88 is opened, and the suction side opening / closing valve 86 is closed to pressurize the inside of the chamber 26. Thereby, as shown in FIG.
The upper and lower rubber elastic films 34, 36 of each heating plate 22 are sealed in the sealed chamber 40.
When the lower rubber elastic film 36 is depressed by being pressed to the side, a space for disposing an unprocessed object is ensured between the heat plates 22 and 22.

Next, the supply side valve 68 and the discharge side valve 70 for supplying and discharging the heat transfer liquid to and from the closed chamber 40 of each heating plate 22.
And the lower rubber elastic body 36 of each heat plate 22 is held in a recessed state, and then the compression side opening / closing valve 88 is closed and the suction side opening / closing valve 86 is opened, so that the inside of the chamber 26 is substantially at atmospheric pressure. Depressurize to.

After that, the opening / closing door (not shown) of the vacuum case 24 is opened, and the workpiece 92 is inserted between the heating plates 22 and 22 and placed on the upper rubber elastic film 34 of the heating plate 22.
At this time, the upper rubber elastic film 34 is attached to the support plate 4
Since the deformation toward the closed chamber 40 side is prevented at 2, the workpiece 92 can be placed on the upper rubber elastic film 34.

Then, after closing the opening / closing door of the vacuum case 24, the suction side opening / closing valve 86 is opened to reduce the pressure in the chamber 26, thereby evacuating the chamber 26. By this vacuuming, the degassing existing between the materials (laminated materials) of the workpiece 92 can be performed at the same time.

Next, as shown in FIG. 5, the movable platen 18 is driven by the hydraulic cylinder 20 toward the fixed platen 16 side so that heat is generated between the movable platen 18 and the fixed platen 16. The plates 22 and 22 are overlapped and pinched. Thereby, the work piece 92 is provided between the two hot plates 22, 22.
The area in which is arranged is closed in a substantially bag shape.
The area formed between the two heating plates 22 and 22 does not need to be hermetically sealed, and the frame fittings 28 and 2 of the both heating plates 22 need to be sealed.
It may be communicated with the outside by providing a through hole between 8 and the like.

After that, the pressurizing valve 71 is opened to pressurize the inside of the auxiliary tank 56 by the compressor 72, and the supply side valve 68 and the discharge side valve 70 are opened, so that the closed chambers of the respective heat plates 22 are closed. A pressurized liquid under pressure is introduced into 40. Further, at that time, the three-way valve 62 is operated to circulate the pressure liquid through the heater 58 to heat it and introduce it as a heating pressure liquid into the closed chamber 40 of each heating plate 22.

As a result, the internal pressure of the closed chamber 40 of each heating plate 22 is increased, and as shown in FIG. 6, the upper and lower rubber elastic films 34, 36 of each heating plate 22 are thus increased.
However, it is bulged outward and deformed. At that time, the displacement of each heating plate 22 in the separating direction is determined by the fixed platen 16 and the movable platen 1.
Since it is regulated by the tightening force of the hydraulic cylinder 20 exerted between the lower hot plate 22 and the lower hot plate 22, the lower rubber elastic film 36 and the lower hot plate 22 in the upper hot plate 22 are shown.
And the upper rubber elastic film 34 are deformed along the outer surface shape of the work piece, and the work piece 9
It will be in close contact with the outer surface of 2. The upper hot plate 2
The outward bulging deformation of the upper rubber elastic film 34 in 2 and the lower rubber elastic film 34 in the lower heating plate 22 are
It is regulated by the fixed platen 16 and the movable platen 18.

Further, since the inside of the chamber 26 is evacuated therein, the rubber elastic film 3 is adhered even when the rubber elastic films 36 and 34 are closely attached to the outer surface of the workpiece 92.
The entry of air between 6, 34 and the workpiece 92 is
It can be prevented as much as possible. Further, those rubber elastic films 36,
It suffices that 34 is in close contact with at least substantially the entire upper and lower surfaces of the work piece 92, and need not be in close contact with the side surface of the work piece 92. Then, so as to be in close contact with the upper and lower surfaces of the workpiece 92,
In consideration of the size and shape of the workpiece 92, the material and thickness of the rubber elastic films 36 and 34, the size thereof, and the like are
It will be decided.

That is, in this way, the hot plates 22, 2
2 is restrained between the fixed platen 16 and the movable platen 18, and the rubber elastic films 36, 34 of the two heating plates 22, 22 are held.
Is adhered to the upper and lower surfaces of the workpiece 92,
The heat and pressure of the heat transfer liquid that is made to flow in the closed chamber 40 of the hot plate 22 is exerted on the workpiece 92 through the rubber elastic films 36 and 34, and thus the workpiece 92 is processed. The hot pressing is applied to the object 92.

After the pressing of the work piece is completed, the three-way valve 62 is switched to circulate the heat transfer liquid through the cooler 60 and guide the heat transfer liquid to the closed chamber 40 of each heat plate 22. To cool the pressed product.

After that, the pressure relief valve 76 is opened to reduce the pressure of the auxiliary tank 56 and the pressure of the closed chamber 40 of the heating plate 22, and then the movable platen 18 is fixed by the hydraulic cylinder 20.
The heating plates 22 are moved away from each other to move the heating plates 22 away from each other.

After that, the inside of the chamber 26 is pressurized by the compressor 72 according to the same operation as the above-mentioned initial step,
The lower rubber elastic film 36 of each heating plate 22 is concavely deformed, and then the pressure inside the chamber 26 is reduced to approximately atmospheric pressure, and then the opening / closing door of the vacuum case 24 is opened, whereby the press product can be taken out. Of. Further, when the next press working is continuously carried out, after the press product is taken out, the work to be processed is inserted between the hot plates 22 and 22 to repeat the above-mentioned press process again. It is possible.

Therefore, in the vacuum pressing apparatus having the above-mentioned structure, the pressing surface of each hot plate 22, which is brought into close contact with the surface of the work piece 92, has the rubber elastic film 3.
6 and 34, the work piece 92 is deformed in accordance with the surface shape of the work piece 92. Therefore, when the work piece 92 has a partially different thickness, a flexible substrate or the like is used. Even if there is, a uniform pressing pressure can be exerted on the entire surface.

Moreover, in such a vacuum pressing apparatus, since the pressing pressure exerted on the workpiece 92 is determined by the liquid pressure of the heat transfer liquid supplied to the closed chamber 40 of each hot plate 22, Regardless of the clamping force exerted by the hydraulic cylinder 20 between the fixed platen 16 and the movable platen 18, the pressure exerted on the heat transfer liquid by the compressor 72 is adjusted by the pressure regulating valve 74, whereby It is possible to control the pressing pressure per unit area exerted on the work piece 92. Therefore, when a plurality of press stages are formed by three or more hot plates 22 and a plurality of workpieces 92 are simultaneously pressed by each press stage, the sizes of the workpieces 92 in each press stage are different. Even in such a case, the same press pressure can be applied to each workpiece 92 per unit area, and the press pressure can be advantageously controlled regardless of the shape and size of each workpiece 92. It will be possible.

Further, in such a vacuum pressing apparatus, since the workpiece 92 is heated and cooled by the heat transfer liquid which is circulated in the closed chamber 40 of the hot plate 22, the wall portion of the closed chamber 40. Coupled with the fact that the rubber elastic films 34 and 36 constituting the above are adhered to substantially the entire upper and lower surfaces of the workpiece 92,
The entire workpiece 92 can be heated uniformly.

Furthermore, in such a vacuum pressing apparatus, since the heating and pressurizing operation (hot pressing) on the workpiece 92 is carried out in the evacuated chamber, heat dissipation by air convection is possible. Therefore, it is possible to obtain higher thermal efficiency.

Further, particularly in the present embodiment, since a liquid having a larger heat capacity than gas is used as the heat transfer medium, excellent heat efficiency can be obtained, and the heating and cooling time can be shortened advantageously. It can be achieved.

The embodiments of the present invention have been described in detail above, but these are literal examples and the present invention should not be construed as being limited to such specific examples.

For example, the number of heat plates 22 arranged between the fixed platen 16 and the movable platen 18 is not limited to that in the above embodiment, and four or more heat plates 22 may be arranged. good.

Further, the supporting member arranged in the closed chamber 40 of the heating plate 22 may be any member as long as it can support the workpiece 92, and in addition to the porous supporting plate 42 as illustrated, a lattice-like member. It is also possible to use a rod or the like.

Furthermore, the supply / discharge means for supplying / discharging the heat transfer fluid to / from each heat plate 22 and the air pressure control means for pressurizing and evacuating the inside of the chamber are not limited to the structures as illustrated.
never.

In the above embodiment, the heat transfer medium is
Although liquid was used, it is possible to use gas instead.

Although not listed one by one, the present invention
Based on the knowledge of those skilled in the art, it can be implemented in various modified, modified, and improved modes, and
It goes without saying that all such embodiments are included in the scope of the present invention without departing from the spirit of the present invention.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a vacuum multi-stage hot pressing apparatus as an embodiment of the present invention.

FIG. 2 is an enlarged sectional view showing a hot plate used in the vacuum multi-stage hot pressing apparatus shown in FIG.

3 is a diagram showing another cross section of the hot plate shown in FIG. 2. FIG.

FIG. 4 is a process diagram for explaining a pressing operation by the vacuum multi-stage hot pressing device shown in FIG.

FIG. 5 is another process diagram for explaining the pressing operation by the vacuum multi-stage hot pressing device shown in FIG.

FIG. 6 is still another process drawing for explaining the pressing operation by the vacuum multi-stage hot pressing apparatus shown in FIG.

[Explanation of symbols]

 10 Pressing device main body 12 Upper plate 14 Lower plate 16 Fixed plate 18 Movable plate 22 Heat plate 24 Vacuum case 26 Chamber 28 Frame metal fitting 34 Upper rubber elastic film 36 Lower rubber elastic film 38 Holding metal fitting 40 Sealing chamber 42 Support plate 44 Through hole 50 Pump 56 Auxiliary Tank 58 Heater 60 Cooler 72 Compressor 80 Vacuum Pump 92 Workpiece

Claims (1)

[Claims] 1. In a chamber covered with a vacuum case, a plurality of hot plates are provided between a fixed platen and a movable platen, and a predetermined workpiece to be placed on the hot plate is provided. A vacuum press device which is sandwiched between hot plates and pressed under heating by the hot plates, wherein the upper and lower surfaces of each of the hot plates are formed by bulging and deformable flexible films. A support for forming a closed chamber between the upper and lower flexible films and supporting the work behind the upper flexible film on which the work is placed in the closed chamber. A vacuum press device characterized in that while a member is provided, a supply / discharge means for supplying / discharging a heat transfer medium to / from this flexible chamber to exert a pressure on the flexible film is provided.