JP2966193B2 - Hot press equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum press apparatus, and more particularly to a vacuum press apparatus capable of uniformly pressurizing a workpiece over the entirety, and is advantageously applied to press processing of a workpiece having a partially different thickness. It relates to a vacuum press device to be obtained.

[0002]

2. Description of the Related Art Conventionally, as one type of a press device, a plurality of hot plates disposed between a fixed platen and a movable platen have been used.
A press device for press-forming a predetermined workpiece is known. In recent years, in order to prevent defects such as voids in a laminated press product, a press processing area is covered with a vacuum case, and There has been proposed a vacuum press apparatus in which a press operation on a workpiece is performed under a predetermined vacuum state. Such a vacuum press apparatus is suitably used, for example, when press-forming a laminated printed wiring board, a laminated printed multilayer board, or a flexible laminated thin board.

In such a vacuum press 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 provided therein. During the press working, the work placed on the hot plate is supported and heated.

However, in a conventional vacuum press using a hot plate as described above, if the processing accuracy of the surface of the hot plate is low or deformation occurs, a uniform pressure is applied to the workpiece. In order not to exert a strong press force,
There has been a problem that the quality of the product is deteriorated and defective products are generated.

[0005] When the thickness of the workpiece is partially different, it is extremely difficult to perform uniform pressing over the entire surface. A cushion material or the like had to be used, and it could not always be applied advantageously.

[0006]

Here, the present invention has been made in view of the above-mentioned circumstances, and the object of the present invention is to provide a work having a partially different thickness, a flexible thin plate substrate, and the like. The pressing force between the hot plates,
An object of the present invention is to provide a vacuum press device having a novel structure that can be uniformly and stably applied over the entire surface.

[0007]

A feature of the present invention is to dispose a plurality of hot plates between a fixed plate and a movable plate in a chamber covered with a vacuum case. A vacuum press apparatus configured to sandwich a predetermined workpiece to be mounted on the hot plate between the hot plates and perform press working under heating by the hot plate; The upper and lower surfaces of the plate are formed of swellable and deformable flexible films, a closed chamber is formed between the upper and lower flexible films, and the upper surface in the closed chamber on which the workpiece is placed. A support member for supporting the workpiece is provided behind the flexible film on the side, and a heat transfer medium is supplied to and discharged from the closed chamber to apply pressure to the flexible film. In a vacuum press device provided with a supply / discharge means.

[0008]

In the vacuum press apparatus having the structure according to the present invention, since the press surfaces (upper and lower surfaces) of the respective hot plates are formed of a flexible film, the work to be processed is performed. Heat plates are placed on top of each other, and the heat plates are constrained between the fixed platen and the movable platen, and a heat transfer medium is supplied to the closed chamber of each heat plate to apply pressure to the flexible membrane. By doing so, the flexible film is pressed against the upper and lower surfaces of the workpiece, and a pressing force is exerted.

At this time, the flexible film constituting the press surface of each hot plate is deformed along the surface of the workpiece and comes into close contact with each other. Regardless of the shape, that is, even for a workpiece having a partially different thickness or a flexible workpiece, a substantially uniform pressing pressure can be effectively exerted over the entire surface.

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

[0011] In the vacuum press apparatus according to the present invention,
Since the work is heated by the heat transfer medium that is supplied and discharged to and from the sealed chamber defined by the flexible film, a press machine with a conventional structure that heats the hot plate with a heating wire or the like is used. In addition, uniform heating of the entire workpiece can be achieved, and excellent thermal efficiency can be obtained particularly when a liquid having a large heat capacity is used as the heat transfer medium.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention will be described in detail with reference to the drawings.

First, FIG. 1 shows a schematic configuration diagram of a vacuum multi-stage hot press apparatus as one embodiment of the present invention. In this figure, reference numeral 10 denotes a press device main body, in which an upper plate 12 and a lower plate 14 are arranged facing each other at a predetermined distance in the vertical direction, and are fixedly connected to each other by tie rods (not shown). Have been. A fixed plate 16 is fixed to the lower part of the upper plate 12, while a movable plate 18 is mounted on the lower plate 14 so as to face the fixed plate 16, and is provided on the lower plate 14. Hydraulic cylinder 2
0, the movable plate 18 moves relative to the fixed plate 16
It can be driven in the approach / separation direction.
In the figure, a hydraulic circuit of a hydraulic cylinder 20 for driving the movable plate 18 is omitted.

Further, between the fixed platen 16 and the movable plate 18, three heating plates 22 are arranged at a predetermined distance from each other in the vertical direction, and are supported by a support mechanism (not shown). Have been.

Then, on the middle and lower hot plates 22,
After placing a predetermined workpiece such as a laminated material for an electric printed wiring board, the movable plate 18 is moved in a direction approaching the fixed plate 16 and pressed to act on the workpiece. A hot press process is performed between the hot plates 22.

A space between the opposing surfaces of the upper plate 12 and the lower plate 14 is covered by a vacuum case 24, whereby a closed chamber in which the plurality of hot plates 22 are disposed is provided. 26 are formed.

Here, as shown in FIGS. 2 and 3, each heating plate 22 has a frame fitting 28 in the shape of a rectangular frame. In addition, upper and lower flange portions 30 and 32 projecting inward are formed in the upper and lower openings of the frame metal fitting 28 at predetermined widths, respectively, continuously in the circumferential direction.

Further, an upper rubber elastic film 34 and a lower rubber elastic film 36 as a thin flexible film are provided at the upper opening and the lower opening of the frame fitting 28, respectively. I have. In addition, these rubber elastic films 34,
As the material 36, one having excellent heat resistance and liquid resistance against a heat transfer liquid described later is used. For example, fluorine rubber, silicon rubber, or the like is preferably used.

The upper and lower rubber elastic films 34, 3
6, the outer peripheral portions thereof are superimposed on the inner surfaces of the upper and lower flange portions 30 and 32 of the frame fitting 28, respectively.
Further, the outer peripheral edge portion is superimposed on the inner peripheral surface of the frame fitting 28 so as to be bent. Press-down fittings 38 are provided on the inner peripheral surface of each side of the frame fitting 28, respectively, as shown in FIG.
Are fixed by bolts 39. The outer peripheral edges of the rubber elastic films 34 and 36 are held between the frame fitting 28 and the holding fitting 38 in a liquid-tight manner and are held.

As a result, the upper opening and the lower opening of the frame fitting 28 are liquid-tightly covered with the upper rubber elastic film 34 and the lower rubber elastic film 36, respectively. Inside the plate 22, a closed chamber 40 having upper and lower walls formed of rubber elastic films 34 and 36 is defined.

A flat supporting plate 42 is accommodated and arranged inside the closed chamber 40. The outer peripheral edge of the supporting plate 42 is formed as shown in FIG.
By being sandwiched between the holding member 38 and the holding member 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 toward the closed chamber 40. The support plate 42 is provided with a plurality of through holes 44 penetrating in the plate thickness direction.
Through both sides of the closed chamber 40 partitioned by the support plate 42 (the upper rubber elastic film 34 side and the lower rubber elastic film 36
Side) portions are in communication with each other.

Further, a liquid supply port 46 and a liquid discharge port 48 are formed on the heat plate 22 in which the closed chamber 40 as described above is formed, with respect to its peripheral wall, respectively.
And through the presser fitting 38.

Each hot plate 2 having such a structure is
As shown in FIG. 1, a heat transfer liquid supply / discharge pipe is connected to 2, so that the heat transfer liquid supply / discharge means allows the liquid to pass through the liquid supply port 46 and the liquid discharge port 48. The heat transfer liquid is supplied and discharged into the closed chamber 40. The heat transfer liquid has a high boiling point and does not adversely affect the hot plate 22 and the like. And the like can be suitably used.

More specifically, the means for supplying and discharging the heat transfer liquid is provided with a pump 50, which supplies the heat transfer liquid pressure-fed from the pump 50 to the closed chamber 40 of each heat plate 22. A liquid flow path having a closed circuit structure including a pipe 52 and a liquid discharge pipe 54 for guiding the heat transfer liquid discharged from the closed chamber 40 of each heating plate 22 to the pump 50 is provided. FIG.
Reference numeral 56 denotes an auxiliary tank for the heat transfer liquid. The pump 50 allows the heat transfer liquid to flow through the closed chambers 40 of the heat plates 22.

A heater 58 for heating the liquid and a cooler 60 for cooling the liquid are arranged in parallel on the liquid supply pipe 52. Then, based on the switching operation of the three-way valve 62, the heat transfer liquid is made to flow through 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 line 52 and the liquid discharge line 54 are branched at their connection sides to the respective hot plates 22 by branch pipes 64 and 66, respectively. Pipes for supplying and discharging the heat transfer liquid to and from each hot plate 22 are provided in parallel with each other. A supply-side valve 68 and a discharge-side valve 70 are provided on the supply / discharge conduits for the respective hot plates 22 provided in parallel with each other. Thus, the supply and discharge control of the heat transfer liquid to and from the closed chamber 40 of each heating plate 22 can be performed independently of each other.

The supply / discharge conduit connected to each hot plate 22 is formed of a flexible tube so that the movement of the hot plate 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 applied to the heat transfer liquid stored in the auxiliary tank 56. It has become. In addition, this auxiliary tank 5
The pressure applied to 6 is controlled by a pressure control valve 74. In FIG. 1, reference numeral 76 denotes a pressure relief valve for releasing the pressure applied to the auxiliary tank 56.

That is, when a pressure is applied to the heat transfer liquid stored in the auxiliary tank 56 by the compressor 72, the liquid supply pipe 52 and the liquid discharge pipe 54
The heat transfer liquid circulated through the heat transfer liquid is pressurized.
A predetermined pressing force is applied to zero.

On the other hand, the upper plate 12 of the press 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 through an air suction pipe 82 connected to the through hole 78. The operation of the vacuum pump 80 evacuates the inside of the chamber 26.

Further, the inside of the chamber 26 of the press body 10 is provided with an air compression line 8 connected to a through hole 78.
4 to the compressor 72. When the pressurized air from the compressor 72 is guided to the chamber 26, 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 pipe 82 and the air compression pipe 84, respectively. Chamber 2 based on
The evacuation and pressurization of 6 are performed alternatively. Further, a pressure reducing valve 90 is provided on the air compression line 84.
Is set, and the pressure in the chamber 26 is set to be low. Specifically, the pressure is set so that a pressure of about ² to 3 kg / cm ² is applied to the chamber 26.

In the press apparatus having such a structure, press molding is performed as follows. In the following description of the press forming operation, the fixed platen 1 is used for simplifying the description and facilitating the understanding.
It is assumed that two hot plates 22, 22 are arranged between the movable plate 6 and the movable plate 18, and the operation is performed based on FIGS.

First, the pressure applied to the auxiliary tank 56 is released by the pressure relief valve 76 to make the inside of the closed chamber 40 of the hot plate 22 non-pressurized, and then the pressure valve 71 is closed and the pressure relief valve 76
, And further, 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 and 36 of each hot plate 22 are
As a result, the lower rubber elastic film 36 is depressed, so that a space for disposing the non-processed object is secured between the hot plates 22.

Next, a supply side valve 68 and a discharge side valve 70 for supplying and discharging the heat transfer liquid to and from the closed chamber 40 of each heating plate 22.
Is closed, the lower rubber elastic body 36 of each heating 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. Reduce pressure to

Thereafter, the opening / closing door (not shown) of the vacuum case 24 is opened, and the workpiece 92 is inserted between the hot plates 22, 22 and placed on the upper rubber elastic film 34 of the hot plate 22.
At this time, the upper rubber elastic film 34 is
At 2, the workpiece 92 can be placed on the upper rubber elastic film 34 because the deformation toward the closed chamber 40 is prevented.

After the opening and closing door of the vacuum case 24 is closed, the suction side opening and closing valve 86 is opened to reduce the pressure in the chamber 26, thereby evacuating the inside of the chamber 26. In addition, by this vacuuming, the gas existing between the materials (laminated materials) of the workpiece 92 can be simultaneously removed.

Next, as shown in FIG. 5, the movable plate 18 is driven toward the fixed plate 16 by the hydraulic cylinder 20, so that heat is generated between the movable plate 18 and the fixed plate 16. The plates 22, 22 are overlapped and pressed. Thereby, the workpiece 92 is located between the hot plates 22 and 22.
Is closed in a substantially bag shape.
The area formed between the two hot plates 22 does not need to be sealed, and the frame fittings 28, 2
It may be communicated with the outside by providing a through-hole between 8, for example.

Thereafter, the pressurizing valve 71 is opened, and the inside of the auxiliary tank 56 is pressurized by the compressor 72, and the supply side valve 68 and the discharge side valve 70 are opened. A pressurized pressurized liquid is introduced into 40. At this time, the three-way valve 62 is operated to circulate the pressure liquid through the heater 58, thereby heating the liquid and guiding it as a heated pressure liquid into the closed chamber 40 of each hot 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 formed.
However, they are bulged outward and deformed. At this time, the displacement of each heating plate 22 in the separation direction is caused by the fixed plate 16 and the movable plate 1.
8, the lower rubber elastic film 36 and the lower hot plate 22 of the upper hot plate 22 are controlled as shown in FIG.
And the upper rubber elastic film 34 is deformed along the outer surface shape of the workpiece, respectively.
2 will be in close contact with the outer surface. The upper heating plate 2
The outward bulging deformation of the upper rubber elastic film 34 and the lower rubber elastic film 34 in the lower hot plate 22 in FIG.
It is regulated by the fixed platen 16 and the movable plate 18.

Further, since the inside of the chamber 26 is evacuated, even when the rubber elastic films 36 and 34 are in close contact with the outer surface of the workpiece 92, the rubber elastic film 3
Air between 6, 34 and the workpiece 92 is
It can be prevented as much as possible. Further, these rubber elastic films 36,
34 may be in close contact over at least substantially the entire upper and lower surfaces of the workpiece 92, and may not necessarily be in close contact with the side surfaces of the workpiece 92. Then, so as to be in close contact with the upper and lower surfaces of the workpiece 92,
Considering the size and shape of the workpiece 92, the material and thickness of the rubber elastic films 36 and 34, or the size thereof,
Will be determined.

That is, in this way, the hot plates 22, 2
2 is constrained between the fixed platen 16 and the movable plate 18, and the rubber elastic films 36, 34 of the hot plates 22, 22 are held.
Are adhered to the upper and lower surfaces of the workpiece 92,
The heat and the pressure of the heat transfer liquid flowing through the closed chamber 40 of the hot plate 22 are applied to the workpiece 92 via the rubber elastic films 36 and 34, so that the workpiece 92 is heated. The object 92 is subjected to hot pressing.

After the pressing of the workpiece 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, whereby the heat transfer liquid Thereby cooling the pressed product.

Thereafter, the pressure relief valve 76 is opened to reduce the pressure in the auxiliary tank 56 and the pressure in the closed chamber 40 of the hot plate 22, and then the movable plate 18 is moved to the fixed plate 1 by the hydraulic cylinder 20.
6 is moved in a direction away from the heat plate 6, and each heating plate 22 is moved away.

Thereafter, the inside of the chamber 26 is pressurized by the compressor 72 in accordance with the same operation as in the above-described initial step.
After the lower rubber elastic film 36 of each hot plate 22 is depressed and deformed, and then the pressure in the chamber 26 is reduced to approximately atmospheric pressure, the press product can be taken out by opening the opening and closing door of the vacuum case 24. It is. When the next press working is continuously performed, after the press product is taken out, the work is inserted again between the hot plates 22 and 22 to repeat the above-described press process again. It is possible.

Therefore, in the vacuum press apparatus having the above-described structure, the pressing surface of each hot plate 22, which is to be in close contact with the surface of the workpiece 92, has the rubber elastic film 3.
6 and 34, which are deformed following the surface shape of the workpiece 92, such that the workpiece 92 has a partially different thickness, a flexible substrate, or the like. Even so, a uniform pressing pressure can be exerted over the entire surface.

Further, in such a vacuum press apparatus, since the press pressure applied to 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, The pressure applied to the heat transfer liquid by the compressor 72 is adjusted by the pressure adjusting valve 74 regardless of the pressing force applied between the fixed board 16 and the movable board 18 by the hydraulic cylinder 20, so that It is possible to control the pressing pressure per unit area exerted on the workpiece 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 in each press stage, the size of the workpiece 92 in each press stage differs. Even in this 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 is possible.

In this vacuum press apparatus, the heating and cooling of the workpiece 92 is performed by the heat transfer liquid circulated through the closed chamber 40 of the hot plate 22, so that the wall of the closed chamber 40 is heated. And the rubber elastic films 34 and 36 constituting the upper and lower surfaces of the workpiece 92 are in close contact with each other.
Thus, the entire workpiece 92 can be uniformly heated.

Further, in such a vacuum press apparatus, since the heating and pressurizing operation (hot press working) for the workpiece 92 is performed in the evacuated chamber, heat can be released by convection of air. Therefore, more excellent thermal efficiency can be obtained.

Further, in this embodiment, in particular, since a liquid having a larger heat capacity than gas is employed as the heat transfer medium, excellent thermal efficiency can be obtained, and the time for heating and cooling can be advantageously reduced. It can be achieved.

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

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

The support member provided in the closed chamber 40 of the hot plate 22 may be any member that can support the workpiece 92. In addition to the porous support plate 42 as shown in the example, a grid-like support member is provided. It is also possible to use a bar or the like.

Further, the supply / discharge means for supplying / discharging the heat transfer fluid to / from each heating 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 a liquid has been used, a gas may be used instead.

In addition, although not enumerated one by one, the present invention
Based on the knowledge of those skilled in the art, various changes, modifications, improvements and the like can be implemented in an embodiment,
It goes without saying that all such embodiments are included within the scope of the present invention, without departing from the spirit of the present invention.

[Brief description of the drawings]

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

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

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

FIG. 4 is a process chart for explaining a pressing operation by the vacuum multi-stage hot press apparatus shown in FIG. 1;

FIG. 5 is another process diagram for explaining the pressing operation by the vacuum multi-stage hot press device shown in FIG. 1;

FIG. 6 is still another process drawing for explaining a pressing operation by the vacuum multi-stage hot press device shown in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Press apparatus main body 12 Upper plate 14 Lower plate 16 Fixed plate 18 Movable plate 22 Hot plate 24 Vacuum case 26 Chamber 28 Frame fitting 34 Upper rubber elastic film 36 Lower rubber elastic film 38 Pressing fitting 40 Sealing chamber 42 Support plate 44 Through hole Reference Signs List 50 pump 56 auxiliary tank 58 heater 60 cooler 72 compressor 80 vacuum pump 92 workpiece

Claims (1)

(57) [Claims] In a chamber covered with a vacuum case, a plurality of hot plates are arranged between a fixed platen and a movable platen, and a predetermined workpiece to be placed on the hot plate is What is claimed is: 1. A vacuum press apparatus comprising a hot plate and a press working under heating by the hot plate, wherein the upper and lower surfaces of each of the hot plates are formed of a swellable and deformable flexible film. Forming a closed chamber between the upper and lower flexible membranes, and supporting the workpiece in the closed chamber behind the upper flexible membrane on which the workpiece is mounted. A vacuum press device comprising a member, and a supply / discharge means for supplying / discharging a heat transfer medium to / from the closed chamber and applying pressure to the flexible film.