JPS63251205A - Embossing die for sheet lamination - Google Patents

Abstract

PURPOSE:To prevent a sheet from adhering on an embossing mold, by forming a fluid layer between a molding surface of the embossing mold and a surface of a molded sheet when the embossing mold is retreated after molding by means of the embossing mold. CONSTITUTION:A mold 12 is coated with a releasing agent and a sheet 13 such as a prepreg sheet placed thereon. Then, an embossing mold 11 for sheet lamination is lowered and its molding surface 3 is pushed under pressure on the mold 12. Then, transferring of the embossing mold is stopped, and a fluid such as air is supplied under pressure from a fluid supplying line 10 to flow a fluid between the molding surface 3 and a molded sheet 13 from a port 7. At the same time, a fluid supplying and discharging line 5 is opened to discharge under vacuum a fluid in an elastic hollow container 2 and to make the deformation into a recess of the molding surface 3 easy. A fluid layer 16 flowing in the outer circumferential direction is formed between the molding surface and the molded sheet 13, and no adherence of the sheet 13 occurs on the molding surface 3 at the time of peeling.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is necessary for aerospace parts, automobile parts, railway vehicle parts, high-speed rotating parts, semiconductor manufacturing equipment, robot parts, etc. where high-speed movement and positioning are desired. The present invention relates to a sheet laminating die for use in manufacturing laminated lightweight, high-strength members.

[Conventional technology] As a laminated lightweight and high-strength member, composite material prepreg sheets, which are partially cured sheets made by impregnating matrix materials in fibers such as carbon, glass, or Kevlar, are laminated and heat-cured. Materials are known and have come to be widely used in the fields mentioned above.

When manufacturing such laminated lightweight, high-strength members, conventionally, an operator would iron the prepreg sheets one by one into a mold of the desired shape coated with a mold release agent such as Teflon or silicone. The pieces were piled up while being pushed out, and finally covered with an upper mold and heated and cured in a furnace.

[Problems to be Solved by the Invention] However, since the matrix material of the prepreg sheet has viscosity, it is sticky and difficult to handle, resulting in poor lamination efficiency and low productivity.

Therefore, there is a need for a means to automatically laminate prepreg sheets, but when using the conventional method of forming metals, plastics, paper, etc. into molds and presses, the method shown in Figs. 9 to 11 is used. The prepreg sheet b can be molded by applying a mold release agent to the mold a, placing the prepreg sheet b thereon, and pressing from the center with a pressing die C made of an elastic material such as rubber.

However, when the pressing mold C is returned, the prepreg sheet b is sticky and the mold a is coated with a mold release agent, so the molded prepreg sheet b remains attached to the pressing mold C and is removed from the mold a. The prepreg sheet b peels off from the mold a, making it impossible to laminate the prepreg sheet b on the mold a.

[Means for Solving the Problems] The present invention was made for the purpose of solving the above-mentioned problems and enabling laminated molding by allowing the molded sheet to easily separate from the mold and remain on the mold side. In a press die that presses and forms a sheet facing a die, at least the forming surface of the hollow body is formed of a flexible material. A laminated sheet characterized in that a flexible fluid supply line for connecting a supply/discharge line and supplying fluid to the outside of the molding surface of the hollow body is arranged so as to penetrate through the non-molding surface of the hollow body. It depends on the stamping die.

[Operation] A sheet is placed between a mold and a press die, and the press die is pressed against the die while the fluid supply/discharge line is opened and fluid is supplied, or the press die is pressed against the die while the fluid supply/discharge line is closed, and the sheet is molded.

Next, when fluid is supplied from the fluid supply line and at the same time the fluid supply and discharge line of the mold is opened to discharge the fluid in the mold, a fluid layer is formed between the molded sheet and the molding surface of the mold, and the molding surface further dents, and the sheet and mold are completely separated.

Laminate molding can be performed by separating the press and molding the next sheet in the same manner.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an explanatory view of one embodiment of the present invention, in which an elastic hollow container 2 formed of a flexible material such as rubber or synthetic resin is airtightly fixed to the outer peripheral edge of a press-type mounting plate l. A conical convex portion 4 is provided in the center of the molding surface 3 of the elastic hollow container 2 to give the molding surface 3 a desired shape.

A fluid supply/discharge line 5 for supplying and discharging fluids such as air, nitrogen gas, water, etc. into the elastic hollow container 2 is connected to a port 6 provided on the press mold mounting plate l. Furthermore, a flexible hose 9 is connected to a port 7 opened at the top of the conical convex portion 4 of the molding surface 3 and another port 8 provided on the press mold mounting plate l.
A fluid supply line IO for supplying fluid to the other port 8 is connected inside the elastic hollow container 2 to form a sheet laminating press die ll.

Next, a process of stacking sheets using the sheet stacking die 11 of the present invention will be explained.

First, a mold release agent such as Teflon or silicone is applied to the mold 12, a sheet 13 such as a prepreg sheet is placed on top of it (FIG. 2), and the sheet lamination press 11 is moved down to form the molding surface 3. is pressed against the mold 12 side (Fig. 3). At this time, the fluid supply/discharge line 5 may be open to supply the required amount of fluid, closed to seal the inside of the elastic hollow container 2, or open to discharge the required amount of fluid from the elastic hollow container 2. You may also do so.

In this way, the molding surface 3 of the sheet laminating press 11 is brought into close contact with the mold 12 from the conical convex portion 4 in the center via the sheet 13, and the air between the sheet 13 and the mold 12 is directed toward the outer periphery. While discharging, the sheet 13 is closely molded on the entire surface (
Figure 4).

Next, the feeding of the press mold 11 in the direction of the arrow is stopped, and fluid such as air is supplied under pressure from the fluid supply line 10, and the port 7
At the same time, the fluid is poured between the molding surface 3 and the molded sheet 13, and the fluid supply/discharge line 5 is opened to evacuate the fluid inside the elastic hollow container 2, thereby facilitating the concave deformation of the molding surface 3 ( w15 figure).

In this way, a fluid layer 1B flowing in the outer circumferential direction is formed between the molding surface 3 and the molded sheet 13, and when the sheet laminating mold 11 is separated from the mold 12 while peeling the sheet 13 from the molding surface 3, The molded sheet 13 is the molding surface 3
It remains in the molded state on the mold 12 without adhering to the mold (FIG. 6). The mold 11 returns to its original shape due to the elastic restoring force of the elastic hollow container 2. At this time, the fluid supply/discharge line 5 may be left open to communicate with the atmosphere, or fluid may be supplied into the elastic hollow container 2 as necessary.

In the above deformation of the elastic hollow container 2, since the boats 7 and 8 are connected by the flexible hose 9, the deformation of the elastic hollow container 2 can be closely followed.

Next, a new sheet is stacked on the forming sheet 13 on the mold 12, and laminated molding is performed again by the same operation as described above.

By repeating the above operations, a required number of laminated sheets 14 are formed (FIG. 7). Further, the upper mold is placed on the mold, and the laminated sheet is integrally cured by placing it in a heating furnace and performing a heat treatment. After heating and curing, the laminated sheet 14 is removed from the mold 12 to obtain a laminated lightweight high-strength member 15 (FIG. 8). Since the mold 12 is coated with a mold release agent, it can be easily removed.

The sheet lamination press mold of the present invention can be used not only for lamination molding of prepreg sheets, but also for molding many other sheet materials.
It goes without saying that various modifications may be made without departing from the gist of the present invention, such as applicability to laminate molding.

[Effects of the Invention] As described above, according to the sheet laminating die of the present invention,
It exhibits various excellent effects as described below.

■ After molding, a fluid layer is formed between the molding surface of the mold and the surface of the molded sheet when the mold retreats.
It is possible to prevent the sheet from adhering to the mold, and automatic lamination molding can be performed by machine work, eliminating the need for manual work as in the past.

<n> Lamination time can be shortened as automation is possible◎
■ Labor savings are possible because automation is possible.

■ Since automation is possible, quality can be improved and stabilized.

■ Since automation is possible, all-night operation is possible.

(2) (ID-(7) can significantly reduce the cost of laminated lightweight, high-strength members.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of one embodiment of the pressing mold of the present invention, FIGS. 2 to 8 are explanatory diagrams showing the lamination molding process of sheets using the pressing mold shown in FIG. 1, and FIG. An explanatory diagram of the state set on the mold, Fig. 3 is an explanatory diagram of the state in which molding by the press mold starts, Fig. 4 is an explanatory diagram of the state in which molding is completed, Fig. 5 is an explanatory diagram of the state in which the separation of the press molds starts, and Fig. 6 The figure is an explanatory diagram of the state in which the pressing mold has been separated, Fig. 7 is an explanatory diagram of the state in which the sheet is laminated and molded on the mold, Fig. 8 is an explanatory diagram of the product after heat curing, and Figs. 9 to 11 9 is an explanatory diagram of a prepreg sheet forming operation using a conventional sheet pressing die, FIG. 9 is an explanatory diagram of a state in which a prepreg sheet is set on a mold, and FIG. 10 is an explanatory diagram showing a state in which a prepreg sheet is formed by a pressing die. 11A and 11B are explanatory diagrams showing a state in which the pressing molds are separated. ■ is a press die mounting plate, 2 is an elastic hollow container, 3 is a molding surface, 5 is a fluid supply/discharge line, 9 is a flexible hose, IO is a fluid supply line, 11 is a press die for sheet lamination, 12 is a mold, 13 indicates a sheet.

Claims (1)

[Claims] 1) In a press die that presses and forms a sheet facing a die, at least the forming surface of the hollow body is formed of a flexible material, and a fluid supply for supplying and discharging fluid to the non-molding surface of the hollow body is provided. For sheet lamination, characterized in that a flexible fluid supply line for connecting a drainage line and supplying fluid to the outside of the molding surface of the hollow body is arranged so as to penetrate through the non-molding surface of the hollow body. Press type.