JPH02274365A - Production of fiber reinforced composite member - Google Patents

Abstract

PURPOSE:To provide the fiber reinforced composite material which is free from cracking and crushing and has excellent dimensional accuracy by pressing a fiber reinforced molding and a press plate by an upper mold to form the molding and the plate, then impregnating a molten metal into the fiber reinforced molding and cutting away the unnecessary part, such as press plate, after solidification. CONSTITUTION:The press plate 22 having a cap-shaped hole is fitted to the upper surface in the upper part and outer side face of the fiber reinforced molding 20. The fiber reinforced molding 20 and the press plate 22 are preheated and are then disposed to a lower mold 23a in such a manner that the press plate 22 is positioned upward. The upper mold 23b is mounted from the upper part toward the lower part of the press plate 22 to clamp the fiber reinforced molding 20 and the press plate 22. The molten metal is impregnated in the fiber reinforced molding 20 and is solidified. The unnecessary part, such as the press plate 22, is cut away. The man-hours for forming the molding are decreased in this way.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a method for manufacturing a fiber-reinforced composite member, and in particular,
The present invention relates to a method for producing a fiber-reinforced composite member in which a molded product having a desired shape is obtained.

(Prior art) Recently, whiskers, particles, short fibers, and long fibers of ceramics (S i 3 N 4 ° Al 2 O 3, 20 6 Ti 0 2, carbon), etc. have been used to increase the specific strength and specific rigidity of products. A fiber-reinforced composite member is being developed in which a metal such as aluminum or an alloy is combined as a matrix metal with a fiber-reinforced molded body constructed of the above.

At present, this fiber-reinforced composite member is often used in locations where partial reinforcement of mechanical parts is required. 4, 5(a) and 5(b), 6, and 7 regarding the manufacturing method of a molded article using such a fiber-reinforced composite member.
This will be explained with reference to figures (a) and (b).

The fiber-reinforced composite member is formed into a molded body 10 close to the shape to be molded using a mold (not shown), or the fiber-reinforced composite member is cut into a molded body 10 close to the shape to be molded (see FIG. 5). a)). 50 pieces of this molded body 10 are prepared in advance.
After heating to 0 to 700°C, the molded body 10 is placed in a mold 11 having a shape similar to that of the molded body 10 as shown in FIG. The molten metal 12 is impregnated into the molded body 10 and solidified under pressure to form a molded product 14 (FIG. 5(b)).

Another method is to shape the fiber-reinforced composite member into a molded body 10a approximately similar to the shape to be molded, and to
℃ and placed in a mold 11, molten metal 12 is injected, and then pressurized with a pressure punch 13 to form a molded body 10.
A is impregnated with molten metal 12 and solidified. The impregnated and solidified molded body 10a is taken out from the mold 11 and cut using a cutting device (not shown) to form a molded product 14a.

(Problems to be Solved by the Invention) Although the above method is simple, a fiber-reinforced molded product is molded in advance into a shape close to the shape to be molded, and the molded product is obtained by impregnating and solidifying this with molten metal in a mold. It requires molding at least two times, so it takes a lot of molding man-hours,
Furthermore, there is a problem in that the desired shape of the molded product cannot be obtained due to springback of the molded product itself.

In addition, when a fiber-reinforced molded body is cut in advance into a shape close to the shape to be molded, and the head is preheated and then molten metal is injected and pressurized, springback etc. may occur due to the elasticity of the molded body itself, and the size There are problems in that it is difficult to establish a system, and cracks and collapses occur.

Furthermore, it has been found that the method of cutting a fiber-reinforced molded product after molding it is very difficult to cut the fiber-reinforced molded product because it is strong.

SUMMARY OF THE INVENTION The present invention aims to solve the above-mentioned problems by providing a method for producing a fiber-reinforced composite member in which a desired molded product can be obtained.

[Structure of the invention]

(Means for Solving the Problems) The present invention involves fitting a perforated presser plate into the upper surface and outer surface of a fiber-reinforced molded article, preheating the fiber-reinforced molded article and the presser plate, and then pressing the presser plate. Place the plate on the lower mold so that the ridge is upward, attach the upper mold downward from the top of this presser plate, clamp the fiber-reinforced molded body and the presser plate, and pour the molten metal into the fiber-reinforced molded body. After the impregnation and coagulation, the presser plate is cut and removed.

(Function) A cap-shaped perforated pressing plate was fitted on the upper surface and outer surface of the fiber-reinforced molded product, and after the fiber-reinforced molded product was preheated, it was placed in a mold, and molten metal was injected and pressure molded. , the impregnation solidification of the fiber-reinforced molded body with the molten metal and the molding of the molded product can be performed simultaneously. Therefore, a molded product that does not crack or collapse can be obtained.

Furthermore, since the cap-shaped perforated presser plate and unnecessary solidified metal are removed after molding, it is possible to obtain a molded product that does not reduce dimensional accuracy due to springback.

(Embodiment) An embodiment of the manufacturing method of the present invention will be described below with reference to the drawings in a case where it is applied to a molded product for reinforcing parts. In addition,
Figure 4, Figure 5 (a) and (b), Figure 6, Figure 7 (
The same parts as in a) and (b) are given the same reference numerals, and detailed explanation thereof will be omitted.

The fiber-reinforced molded body indicated by the reference numeral 20 is composed of whiskers, particles, short fibers, and long fibers of ceramic, etc., and is formed into a substantially cylindrical shape, for example. This fiber-reinforced molded body 20 has about 50 to 80% voids. A plurality of holes 21 are provided on the upper surface and outer surface of this fiber-reinforced molded body 20.
The cap-shaped perforated presser plate 22 is fitted (third
Figures (a) (b)). This fiber-reinforced molded body 20 is heated to 500°C to 70°C using a heating device (not shown) such as an electric heater.
The temperature of the presser plate 22 is 200°C to 550°C.
The lower die 23 of the mold is preheated to a temperature of and formed into an appropriate shape.
A is arranged so that the presser plate 22 is on top. An upper mold 23b for pressing the fiber-reinforced molded product 20 via a presser plate 22 is provided on the upper part of the fiber-reinforced molded product 20 to perform mold clamping.

A molten metal 12 of aluminum or other alloy is injected from a molten metal inlet 24 through a runner 25 into the clamped fiber-reinforced molded body 20, and at the same time, this molten metal 12 is pressed into a fiber-reinforced molded body by a pressurizing piston 26. The voids in the body 20 are impregnated. In this impregnation, the molten metal 12 passes through the plurality of holes 21 of the holding plate 22 and is sufficiently impregnated into the voids of the fiber-reinforced molded body 20.

This pressurization by the pressurizing piston 26 is continued until the molten metal 12 solidifies, forming a reinforced composite member.

The solidified composite member is taken out from the mold and placed on the presser plate 22.
The molded product 14 of the piston head is formed by cutting off unnecessary portions of the molten metal 12 using a cutting device (not shown).

In such a case, if the molded product 14 is to be partially reinforced, the presser plate 22 should be made similar to the alloy base material and the molten metal 1
2 should be cast.

〔Effect of the invention〕

A cap pressing plate with multiple holes is fitted onto the fiber-reinforced molded body, and the fiber-reinforced molded body and presser plate are preheated while being fitted, then placed in a mold, and molten metal is injected and pressurized to impregnate and solidify. After the composite material is integrally molded, unnecessary parts of the cap and cast metal are cut away to form the molded product, which reduces the number of man-hours required for molding the molded product. This method protects the body and prevents molded products from cracking and soaking.It is possible to obtain products with superior accuracy.

In addition, the fiber-reinforced molded product is placed in a mold while being preheated, and after the molten metal is injected, it is pressurized and impregnated and solidified. The high and low points are formed continuously without any breaks, making it possible to form a strong composite material.

Therefore, it is possible to obtain a molded article molded by this manufacturing method with high precision without causing deformation due to elastic deformation or springback.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a mold showing the method for producing a fiber-reinforced molded article of the present invention, FIG. 2 is an explanatory view showing the operating state of the mold in FIG. 1, and FIGS. 3(a) and (b) ) are a cross-sectional view and a plan view of a member in which a cap-shaped perforated presser plate is fitted to a fiber-reinforced molded body, FIGS. 4, 5 (a) and (b), and 6
7(a) and (b) are schematic explanatory diagrams illustrating a method for manufacturing a fiber-reinforced composite molded article by a conventional method. 10.10a...m fiber-reinforced molded body, 11...mold,
12... Molten metal, 13... Pressure punch, 14.14a
... Molded product, 20... Fiber-reinforced molded product, 21...
Hole, 22... Pressing plate, 23a... Lower mold. 236... Upper mold, 24... Molten metal inlet, 25...
Runway, 26...pressure piston. Kun 1 figure 2 figure (b) 3 figure 4 figure (σ) Horse 5 figure (b)

Claims (1)

[Claims] A cap-shaped perforated presser plate is fitted on the upper surface and outer surface of the fiber-reinforced molded body, and after preheating the fiber-reinforced molded body and the presser plate, the presser plate is placed on the lower mold so that the presser plate faces upward;
An upper die is attached downward from the top of the presser plate, and the fiber-reinforced molded body and the presser plate are clamped. After the fiber-reinforced molded body is impregnated with the molten metal and solidified, unnecessary parts such as the presser plate are removed. A method for producing a fiber-reinforced composite member, characterized by cutting and removing the material.