JPS61238002A - Production of fiber-reinforced plastic reflecting mirror - Google Patents

Abstract

PURPOSE:To obtain the titled mirror having high accuracy by vapor depositing a metal on a forming die suitable for using as a reflecting mirror and having dimensional accuracy and the small coefficient of linear expansion and by laminating fiber-reinforced plastics on the vapor deposited metal followed by curing with heating under pressure. CONSTITUTION:The forming diel having the dimensional accuracy as the reflecting mirror and the small coefficient of linear expansion is made of a heat resisting glass such as 'Pyrex(R)'. The vapor-deposited film 7 made of Al is formed on the surface of the forming die 1 and a FRP plate 3 is laminated on a film 7 and is made of the carbon fiber reinforced plastics. The reflecting mirror is formed by directly vapor-depositing the metal on the forming die 1 without coating a releasing agent on the die to form the vapor-deposited film 7 followed by laminating the FRP plate 3 on the film 7 and then curing by heating under the pressure. As the molding die 1 has the small coefficient of linear expansion, when the vapor-deposited film 7 is adhered with the FRP laminate, the FRP plate and the vapor-deposited film 7 are not peeled off from the forming die 1 in the molding and the surface of the forming die having the dimensional accuracy as the reflecting mirror is transferred to the surface of the molded article resulted in the reflecting film 4. As the molded article has small adhesive strength between the vapor-deposited film 7 and the forming die 1, the molded article is released from the die therebetween resulted to obtain the reflecting mirror 4.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing a mirror made of fiber-reinforced plastic (hereinafter referred to as FRP) that reflects light in the infrared to visible light range.

[Conventional technology]

FIG. 4 is a sectional view showing a conventional manufacturing method, and FIG. 5 is a sectional view showing a manufactured reflecting mirror.

In the figure, (1) is the mold, (2) is the mold release agent applied to its surface, and (3) is the FR laminated on the mold (1).
It is a P board. Figure 5 shows the molded product shown in Figure 4 after being removed from the mold.
The surface is polished and a reflective film (4) is provided by vapor deposition.

In the conventional manufacturing method, as shown in Figure 4, a mold (1)
After applying a mold release agent (2) on top, an FRP board (3) is laminated on top of it, and this is heated under pressure to harden the resin and removed from the mold.
At the same time as removing the mold release agent (2), the surface is polished so that it has the shape accuracy as a reflecting mirror. By forming the reflective film (4) by polishing machine vapor deposition, the FRP shown in FIG.
reflector is manufactured.

FIG. 6 is a cross-sectional view showing another manufacturing method of Itaku, and shows a manufacturing method for obtaining a molded product having a sandwich inch structure, whereas the molded product is an FRP veneer.

In the figure, (3a) is an FRP board, and (5) is a core material made of a honeycomb core or polymer foam, which is bonded to the FRP boards (3) and (3a) with an adhesive (6).

The manufacturing method shown in FIG.
The RP board (3) and the separately manufactured FRP board (3a) are glued to the front and back sides of the core material (5) to obtain a molded product with a sandwich inch structure, and this is surface treated in the same manner as above to create a reflective mirror. Manufactured.

[Problem that the invention seeks to solve]

According to the conventional manufacturing method as described above, there is a problem in that the resin on the FRP surface is polished before the fibers are polished during the polishing process, and the reflective surface becomes uneven and light rays are diffusely reflected. Furthermore, since a mold release agent is used, the adhesion of the deposited film is also poor. Furthermore, this polishing process takes time and there are other problems such as inefficient manufacturing.

This invention was made in order to solve the above-mentioned problems, and aims to provide a manufacturing method that can obtain a highly accurate FRP reflecting mirror.

[Means for solving problems]

The method for manufacturing an FRP reflective mirror according to the present invention is to vapor-deposit metal on a mold with a small coefficient of linear expansion and have shape accuracy as a reflective mirror, layer FRP on top of the mold, and heat and pressurize this. It is designed to harden the resin.

[For production]

According to this invention, since the reflective film is simultaneously molded on a mold with a low coefficient of linear expansion that has the shape precision of a reflective mirror, the highly accurate shape of the mold is transferred to the reflective surface side. At this time, the adhesion between the reflective film 1 and the FRP skin is good, but the adhesion with the mold is poor, so the film is removed from the mold between the mold and the reflective film, and in this state it becomes a highly accurate reflective mirror.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of the manufacturing process, and FIG. 2 is a sectional view of the FRP reflector in a demolded state.

In the figure, (1) is a mold with a small coefficient of linear expansion that has the precision of a shape as a reflecting mirror, and is made of a heat-resistant glass mold such as Pyrex (Corning Co., Ltd., Commercial S). (7)
) is a vapor-deposited film applied to the surface of the mold (1), and in this embodiment, it is made of, for example, an aluminum vapor-deposited film. An FRP board (3) is laminated thereon. In this embodiment, carbon fiber reinforced plastic is used.

The manufacturing method of the reflective mirror is to deposit metal directly onto the mold (1) without applying a mold release agent to form a deposited film (7), and then to apply the FR.
P plates (3) are laminated and cured under pressure and heat. At this time, the vapor deposited film (7) is bonded to the FRP laminate, and at the same time,
Because the coefficient of linear expansion of the mold (1) is small, the special mold (
The FRP plate (3) and the deposited film (7) do not peel off from 1), and the surface of the mold, which has the shape precision of a reflecting mirror, is transferred to the surface of the molded product to become the reflective film (4). Since the molded product has a weak adhesion between the vapor deposited film (7) and the mold (1), the mold is removed between them, thereby obtaining a highly accurate reflecting mirror.

In the above example, a single FRP reflector was shown, but
Even when manufacturing a molded product with a sandwich structure as shown in Figure 3, after the FRP board (3) is cured, adhesive (6 ) by FRP board (3) and other FRP boards (
A similar high-precision reflecting mirror can be obtained by bonding and sandwich-molding 3a).

〔Effect of the invention〕

As explained above, according to the present invention, metal is vapor-deposited on the mold, FRP is laminated on top of the metal, and the FRP is heated and hardened. Therefore, there is no need for polishing work, and high precision is achieved without diffusely reflecting light. An FRP reflective mirror is obtained in a package. In addition, the manufacturing process is simple and high-precision molds can be used repeatedly, resulting in lower manufacturing costs.

[Brief explanation of drawings]

1 and 3 are sectional views showing a manufacturing method according to another embodiment of the present invention, FIG. 2 is a sectional view of the reflecting mirror manufactured in FIG. 1, and FIGS. 4 and 6 are sectional views, respectively. A sectional view showing another conventional manufacturing method, FIG. 5 is a sectional view of the reflecting mirror manufactured in FIG. 4. In the figure, (1) is a mold, (3) and (3a) are FRP plates, (4) is a reflective film, (5) is a core material, and (7) is a deposited film. Note that in each figure, the same reference numerals indicate the same parts.

Claims (2)

[Claims] (1) A fiber-reinforced plastic reflector characterized by depositing metal on a mold with a low coefficient of linear expansion and having shape accuracy as a reflector, laminating fiber-reinforced plastic on top of the mold, and curing under pressure and heat. How to make mirrors. (2) The method for manufacturing a fiber-reinforced plastic reflecting mirror according to claim 1, wherein the fiber-reinforced plastic is bonded to a core material made of a honeycomb core or a polymer foam.