JPS5881125A - Manufacture of fan cover of reinforced plastic - Google Patents

Abstract

PURPOSE:To obtain inexpensively a lightweight motor cover good in corrosion resistance for an electric aplliance, by molding glass fibers and a unsaturated polyester or the like using a mold that has ridges for forming an inlet section for fresh air, and cutting the ridges of the molded item to be flushed with the remaining part. CONSTITUTION:Using a reinforced plastic consisting of a reinforcing base material mainly of glass fibers and of mainly an unsaturated polyester resin or other synthetic resins (e.g. epoxy resin, etc.), a motor cover 1 for an electric aplliance is molded to have ridges 3 on the fresh air introducing section by hand lay-up, and the ridges 3 are flushed from the inside or outside of the fresh air introducing section by a hand grinder or the like, so that slits are formed for introducing fresh air to obtain the intended fan cover.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a motor fan cover made of reinforced glass, which is mainly used as an interior/exterior part for medium-sized or larger heavy electric machines and is intended for corrosion resistance, weight reduction, and cost reduction.

Conventionally, fan covers and other parts for motors for heavy electrical machinery (e.g. windbreak plates, air guides, etc.) are produced relatively easily (for motors with small overflows, sheet metal pressing is required from steel plates); If it is larger than a motor, since it is a deep drawing shape, it is necessary to integrate several parts made of sheet metal press parts and laminated steel sheets with #l contact, or the number of sheet metal steps is p.
If it is made of sheet metal (steel plate), it will be heavy to handle, and it will corrode easily, so there will be a problem with its service life.Furthermore, it can also be made into cast, welded, or hand-made products during production. The drawback was that it was complicated and expensive to process. Also, when painting a finished product, it was necessary to apply a rust preventive coating in advance.

In order to improve these drawbacks, the present invention has conducted various studies, and as a result, we have developed a molded product that can be expected to be cost-reduced, has corrosion resistance, is lightweight, and has satisfactory strength.
We discovered that reinforced glass (hereinafter referred to as ``1PRP''), which is mainly made of glass fiber as a base material, unsaturated polyester resin as a living body, and a good thermosetting resin, is extremely suitable, and developed a fan cover as a single body to allow outside air to be taken in. The fan power is characterized by making a groove so that the part has an uneven shape and cutting the inner or outer surface of the outside air intake part of the product on the t-plane of the convex part to expose a slit for outside air intake. There is a lot about the manufacturing method for children. In addition, in the present invention, the outside air intake part with an uneven shape may be molded integrally with the main body, or in some cases, only the outside air intake part may be separately molded using FRP, a slit is formed, and then the main body cover and FRF overlay or ** agent are used. It may be joined.

In addition to glass fiber, the base material used for these reinforced plastics may be synthetic fibers such as Tetron, Vinylon, or other base materials commonly used in IFRP.As the thermosetting resin, unsaturated polyester resin Ixy resin may be used. ,
Phenol resins and the like are commonly used.

FRP molding methods include hand lay atsuno, suruiag, resin injection, cold press, and BM.
General molding methods such as O, BMO, etc. may be used. In addition, in order to obtain a predetermined external color, the straw may be colored with resin in advance, or the surface may be gel coated, or it may be post-painted in some cases.

The reinforced plastic motor fan cover obtained by the present invention has nine excellent characteristics as described below. Even deep-drawn shapes without trenches can be integrally molded, and the molded product is corrosion resistant, so it can withstand long-term use even in corrosive atmospheres. When assembling the product, the tools used when handling conventional heavy objects are no longer required, and assembly time and personnel can be reduced, making it easy to carry out inspections and repairs after installation. There are many advantages such as.

Furthermore, since it is integrally molded, it is possible to produce any number of pieces of the same shape as long as the molding is done, and cutting, welding, etc.
A significant cost reduction can be expected due to the reduction in processing fees. In addition, in order to obtain the exterior color, the resin can be colored in advance or treated with a gel coat, and if post-painting is required, it can be painted without the need for anti-rust paint, making it more streamlined from this perspective. can contribute to

Having described the numerous advantages of the present invention above, Yonekyu will now present an example of a method for manufacturing a fan cover made of reinforced glass.

Example 1 A scalpel lid for hand-lay horn molding with a product shape as shown in Figure 1 and a slit shape as shown in Figure 3 was made, and after applying gel coat resin, unsaturated polyester resin and chopped strand mat ( A fan cover with a wall thickness of 3.0 to 3.5 cm is formed using glass content (approx.
) so that it is flush with PAv (c-
os) Polished to create a finishing slit (Figure 4).

Example 2 The product shape of Example 1 (Fig. 1) was made (male and female molds were made, and chopped strand mats were placed on the male molds so that the glass content of the FRP was well adjusted. Approximately 450
t/ml) along the shape of the mold, fit the female mold onto it, and it is attached to a four-sided guide. After injecting and curing the polyester resin and demolding, an FRP (FIG. 1) having the same shape as in Example 1 was obtained. A fan cover with a slit for taking in outside air was obtained by cutting the part a-o in FIG. 3 (FIG. 4).

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and 1 in FIG. 1 is a front view, 2 in FIG. 1 is a side view, 2 is a sectional view, and 3.
Figure 4 is a partially enlarged view. 1: Fan power bar body 2: Outside air intake part 3: Convex part when looking at the outside air intake part from inside the product 4 Nislit part 5: Center part

Claims (1)

[Claims] An electric machine made of reinforced plastic made of a reinforced base material mainly made of glass fiber and mainly unsaturated polyester resin and other synthetic resins, the outside air intake part of the cover has a four convex shape 7. A method for manufacturing a 7-anchor par, characterized in that after molding the product, a convex portion is cut flush with the inner surface or expanded outer surface of the outside air intake portion of the product to expose a slit for outside air intake.