JPS63299894A - Vacuum pressing method - Google Patents

Abstract

PURPOSE:To remove forming cost by arranging a vacuum chamber, in which heating and opening/closing drive are possible, and pressurizing and heating a material to be formed under closing condition of the chamber and under vacuum. CONSTITUTION:Upper and lower continuous sheet winding rolls 6b, 6a are arranged and upper and lower continuous sheets 7b, 7a are respectively arranged. Further, the vacuum chamber 10 having the heating mechanism 4 and to be possible to drive to opening/closing is arranged at position between continuous sheet supplying device 6 and sheet drawing device 8. B stage material 5b and A stage material 5a are laid as piling on the lower side continuous sheet 7a and the materials 5b, 5a are charged into the vacuum chamber 10 with the drawing device 8. The movable chamber 10a is ascended with opening/ closing means 13 and the materials 5b, 5a are heated and pressurized to form under vacuum condition between the movable chamber 10a and fixed chamber 10b. As the material is formed under low pressure, the press equipment is miniaturized and the forming cost is reduced.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a vacuum press method for press-molding a molded object using vacuum pressure.

[Conventional technology]

FIG. 2 is a schematic configuration diagram showing a conventional pressing method.
2 is a pressurizing device that moves up and down, 2 is a movable platen supported on the upper end of the pressurizing device 1 and driven up and down by the pressurizing device 1, and 3 is a fixed side disposed above the movable platen 2. A platen, 4 is a heating mechanism that heats each of the stationary platen 3 and the movable platen 2, and 5 is a molded object. A stage material 5a in a semi-cured state where the reaction has been completed halfway, and stage B where the thermosetting material is completely cured.
It consists of a combination with stage material 5b. Next, the operation will be explained. The movable platen 2 and the fixed platen 3 are heated by the heating mechanism 4, and the B stage material 5b is placed on the movable platen 2.
and the A-stage material 5a, and when the pressurizing device 1 is started to rise in this state, the movable platen 2 is pushed up, and the B-stage material 5b and the A-stage material 5a are placed on top of each other.
The stage material 5a is heated and pressurized between the movable platen 2 and the fixed platen 3 to be integrally molded.

[Problems to be solved by the invention]

Since the conventional pressing method is configured as above,
During press molding of the molded object 5, the A stage materials 5a and B
In order to remove air bubbles generated between the stage material 5b and the stage material 5b, it is necessary to apply high pressure (for example, 40 to 45 kg/d) with the pressurizing device 1, which increases the size of the entire device and increases the cost. There were problems such as the considerable cost involved. This invention was made to solve the above-mentioned problems, and an object thereof is to provide a vacuum press method that can easily mold a molded object at low pressure and can reduce costs.

[Means for Solving the Problems] The vacuum press method according to the present invention includes a feeding step of opening a vacuum chamber that is heated and driven to open and close, and feeding a molded object into the vacuum chamber; The process consists of a heating and pressurizing step in which the vacuum chamber is closed and the object to be formed is heated and pressurized in a vacuum state, and a drawing step in which the vacuum chamber is opened after the heating and pressurization and the object to be formed is drawn out. be.

[For use]

In the vacuum pressing method of the present invention, the molded product is supplied into a heated open vacuum chamber, and then the vacuum chamber is closed, so that the molded product is heated and pressurized in this vacuum chamber. It is integrally molded. After the molding, the vacuum chamber is opened and the integral molding is pulled out.

【Example】

An embodiment of the present invention will be described below with reference to the drawings. 1st
The figure is a schematic front view of a vacuum press method according to an embodiment of the present invention, and the same or corresponding parts as in FIG. 2 are given the same reference numerals. In the figure, 6a is a roll for winding the lower continuous sheet (hereinafter referred to as lower roll), 6b is a roll for winding the upper continuous sheet (hereinafter referred to as upper roll), and these lower roll 6a and upper roll 6b constitutes a continuous sheet feeding device 6. 7a is the lower continuous sheet wound around the lower roll 6a, 7b is the upper roll 6
8 is a sheet pull-out device disposed in front of the continuous sheet supply device 6 in the sheet feeding direction, and in the illustrated example, the sheet draw-out device 8 includes a cylinder 8a and a It consists of a chucking part 8b that is provided at the extensible end of the chucking part 8a and chucks the most advanced sealed parts of the lower continuous sheet 7a and the upper continuous sheet 7b. The sheet drawing device 8 and the continuous sheet feeding device 6 transfer the molded article 5 mounted on the lower continuous sheet 7a to the upper continuous sheet 7b.
It constitutes a transfer means that transfers the material by sandwiching it between the two. Reference numeral 10 denotes a vacuum chamber which is disposed between the continuous sheet feeding device 6 and the sheet drawing device 8 and is heated by the heating mechanism 4 and can be driven to open and close.
It consists of a lower movable chamber 10a and an upper fixed chamber 10b. lla is a heat-resistant lower rubber sheet stretched inside the movable side chamber 10a, llb is a heat-resistant upper rubber sheet stretched inside the fixed side chamber 10b, 12a and 12b.
are sealing members such as O-rings provided at the upper end of the movable chamber 10a and the lower end of the stationary chamber 10b, respectively, and these sealing members 12a, 1
2b, the lower rubber sheet 11a, and the upper rubber sheet 11b form a vacuum chamber when the vacuum chamber 10 is closed. 13 is a chamber opening/closing means such as a cylinder that drives the movable chamber 10a up and down; 14 is a vacuum pump connected to the vacuum chamber 10; in the illustrated example, it is connected to the inside of the lower rubber sheet lla; There is. Reference numeral 15a is an inlet side work table which is arranged on the population side of the vacuum chamber 10 and movably supports the lower continuous sheet 7a, and 15b is arranged at the outlet side of the vacuum chamber 10 and supports the lower continuous sheet 7a. This is a movably supported exit side work table. Next, the operation will be explained. When the B stage material 5b and the A stage material 5a are stacked and stacked on the lower continuous sheet 7a on the entrance side work table 15a, the lower continuous sheet 7a and the upper continuous sheet 7b are removed by the sheet pull-out device 8. By being pulled in the direction of the arrow in the figure, the B-stage material 5b and the A-stage material 5a are drawn into the open vacuum chamber IO, and the sheet pull-out bag W8 stops at that position (product feeding step). . After this feeding process, the chamber opening/closing means 13 is activated to move the movable chamber 1
0a is raised, and the movable chamber 10a is pressed against the fixed chamber 10b via the seal members 12a and 12b. As a result, the vacuum chamber 10 is closed, and a sealed vacuum chamber is formed between the lower rubber sheet lla and the upper rubber sheet 11b inside the vacuum chamber 10, and a negative pressure (suction force) is applied to this vacuum chamber by the vacuum pump 14. acts, and the movable side chamber 10a and the fixed side chamber 1
0b is heated by the heating mechanism 4, the above B
The stage material 5b and the A-stage material 5a are heated and pressurized to be integrally molded (heating and pressurizing the molded object). Thereafter, the movable chamber 10a is driven downward by the chamber opening/closing means 13 to open the vacuum chamber 10, and then the sheet pull-out device 8 opens the lower continuous sheet 7a and the upper continuous sheet 7b. By being pulled, the integrally molded product formed as described above is pulled out from the vacuum chamber 10 onto the outlet-side work table 15b and recovered (molded product drawing step). In the above embodiment, the B-stage material 5b and the A-stage material 5a were used as the object to be formed 5, but the object to be formed 5 may be only the upper continuous sheet 7b. As a means, lower continuous sheet 7a and upper continuous sheet) 7b were used, but these lower continuous sheets) 7a
Alternatively, the object to be molded 5 may be the upper continuous sheet 7b itself.

【Effect of the invention】

As described above, according to the present invention, the vacuum chamber, which is heated and driven to open and close, is opened and the molded article is introduced into the vacuum chamber, and then the vacuum chamber is closed, so that the molded article is vacuumed. Since the process is one-piece molding by heating and pressurizing the product in the same state, the above-mentioned objects can be molded in one piece at a lower pressure than with conventional pressing methods.This allows the press equipment to be small-scale and reduces costs. There are effects such as being able to achieve this.

[Brief explanation of drawings]

FIG. 1 is a schematic front view of a vacuum pressing method according to an embodiment of the present invention, and FIG. 2 is a schematic front view showing a conventional pressing method. In the figure, 5 is the object to be formed, 6 is a continuous sheet feeding device (
8 is a sheet pull-out device (transfer means), and 10 is a vacuum chamber. In the drawings, the same reference numerals indicate the same or corresponding parts. Patent applicant: Mitsubishi Electric Corporation (2 others)

Claims (3)

[Claims] (1) A feeding step in which a vacuum chamber that is heated and driven to open and close is opened and the object to be formed is fed into the vacuum chamber, and then the vacuum chamber is closed and the object to be formed is heated in a vacuum state by the vacuum chamber. A vacuum press method comprising a heating and pressurizing step of applying pressure, and a drawing step of opening the vacuum chamber and drawing out the molded object after the heating and pressurizing. (2) In the feeding step, the object to be molded is mounted on a continuous sheet fed out at the entrance side of the vacuum chamber and fed in. Vacuum press method. (3) The vacuum pressing method according to claim 1, wherein the object to be molded is a thermosetting material.