JPS6049089B2 - Manufacturing method of FRP antenna reflector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a manufacturing method for efficiently obtaining a highly accurate antenna reflector.

In the conventional FRP antenna reflector, as shown in FIG. 9, a radio wave reflecting surface was obtained by spraying metal onto one side of the FRP molded product.

In this case, since the metal spraying itself has a small anchoring effect on the FRP surface, the FRP surface is sandblasted in advance and then the metal spray is applied to improve adhesion. Therefore, one side of the FRP molded product, which has the same high mirror surface precision as the mold, was precisely damaged using plastic spray, and then a metal particle layer of varying thickness was attached to the surface precision. caused deterioration.

Also, the metal sprayed surface had poor weather resistance and required painting to protect it. Figure 10 shows the FR manufactured in the above process.
A schematic cross section of the P surface is shown.

That is, the sandblasted rough surface 11 and the metal sprayed surface 12 of the FRP molded product 10 are shown. Conventionally, the method for molding FRP antenna reflectors has been a manual method (pant-lay-up method) that uses only the mold on the mirror side (generally a male mold), but this method has low productivity;
The quality is unstable, and it is difficult to ensure the surface precision necessary to reflect radio waves efficiently.

In addition, the compression molding method using male and female molds is common as a highly productive FRP molding method, but in this molding method, metal spraying is performed inside the mold installed in a press machine. The workability of the mold itself is poor, and it is inevitable that metal spray droplets will adhere to the dynamic, moving parts and precision fitting parts of the mold and press.Also, since the thermal spraying process gets into the press process, the molding cycle becomes longer and efficiency decreases significantly.

An object of the present invention is to provide a manufacturing method for efficiently producing a highly accurate FRP antenna reflector.

This invention is a resin injection molding method in which male and female resin molds (or molds may be used) are used, reinforcing fibers are charged into the molds in advance, and resin is injected from a pressurized tank. It is in what you get the antenna reflector.

In other words, in this molding method, a large number of relatively inexpensive molds are prepared, and metal thermal spraying as shown in the process diagram of Figure 5, reinforcing fiber charge as shown in the process diagram of Figure 6, and reinforcing fiber charge as shown in the process diagram of Figure 7 are used. It is possible to perform the steps of resin injection in the process diagram, demolding and mold cleaning in the process diagram in Figure 8 in parallel using separate molds, and these processes can be performed individually or in combination. By combining processes and performing parallel operations, one molding machine (machine for resin injection) can be operated continuously to perform efficient molding work.

Since the reinforcing fiber 1 is placed between the male mold 3 and the female mold 4 and the resin 2 is injected under pressure to form the molded product, the quality of the molded product such as strength and surface precision is stable.

In addition, since metal spraying is performed directly on the mold to obtain a radio wave reflecting surface, as long as the mold surface is made with high precision, a high precision radio wave reflecting mirror surface that is exactly the same as that of the mold can be obtained by demolding the molded product. becomes possible.

FIG. 11 shows an example of the cross section of the antenna reflector thus obtained. That is, in the FRP molded product 13 obtained by resin injection molding, the radio wave reflecting surface 14 is obtained by transferring the surface of the mold, thereby making it possible to obtain a highly accurate radio wave reflecting surface. Furthermore, since a resin with high adhesive strength such as polyester resin is injected and molded after metallization, the adhesion between the metal layer and the FRP part is also significantly improved. Note that if a spray equivalent to a paint film (gel coat) is applied in advance before metallization, painting, which has conventionally been done to protect the metallized surface, becomes unnecessary. As a result of the above, high-precision FRP
Reflectors can be mass-produced economically.

[Brief explanation of the drawing]

1 to 4 are manufacturing process diagrams of a conventional FRP antenna reflector, and FIGS. 5 to 8 show an embodiment of the manufacturing method according to the present invention.

Claims (1)

[Claims] 1 After molding an FRP antenna mold consisting of a male mold and a female mold, metal spraying is applied in advance to the surface of either the male mold or the female mold on the side that will become the radio wave reflecting surface, and reinforcing fibers are placed on top of it. The other mold of the mold is placed on top of this, and resin is injected under pressure between them to obtain an FR antenna reflector.
Method for manufacturing P antenna reflector.