JPS60110830A - Production of fiber-reinforced composite member - Google Patents

Abstract

PURPOSE:To produce a fiber-reinforced composite member having high quality in the stage of casting the reinforced composite member consisting of a bar- shaped fiber molding as a reinforcing material and a metal by forming the cross sectional shapes of the fiber molding and the combining part into a similar figure and adjusting the space and sectional area ratio between the fiber molding and the composite part at specific values. CONSTITUTION:A fiber molding F1 is attached to the top end of a core 71 for forming a piston pin hole in the rod forming part 4C of a casting cavity 4 constituted of upper and lower casting molds 1, 2 in the case of producing a connecting rod for an internal-combustion engine of a fiber reinforced composite material. A molten metal is poured from a hopper 11 through a sprue 3 and is filled into the sprue 3, the cavity 4 and a well 5. A molten metal supply pipe 9 is closed with a seal plunger 12 and a plunger 13 is risen to pressurize the molten metal in the sprue 3; at the same time, the molten metal is pressurized and solidified by pressurizing punches 141-143. The sections of the fiber molding F1 and the combining part 15C are made into a similar figure. The space (t) between the surface of the F1 and the outside surface of the 4C is made to >=2mm.. The sectional area of the F1 is made to >=25% of the sectional area of the 15C.

Description

[Detailed description of the invention] The present invention relates to a method for manufacturing a fiber-reinforced composite member.

The present applicant has previously developed a manufacturing method of this type in which the molten metal filled in the cavity of the mold is pressurized with high hydrostatic pressure, thereby filling and compounding it into a rod-shaped fiber molded body disposed in the composite part of the cavity. We are proposing a manufacturing method that applies the solidification casting method (see Japanese Patent Application No. 173687-1987).
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In order to obtain a high-quality composite member using the above manufacturing method, the cross-sectional shapes of both the fiber molded body and the composite part, the distance between the outer peripheral surface of the fiber molded body and the outer peripheral surface of the composite part, and the cross section of the fiber molded body and the composite part are required. The area ratio becomes a problem.

That is, depending on the cross-sectional shape of the fiber molded body and the composite part, the flow of the molten metal may not be smooth, and if the distance is narrow, the temperature of the molten metal will drop between the fiber molded body and the composite part, causing a hot melt boundary. In order to solve this problem, if the ratio of the cross-sectional area of the fiber molded body to the cross-sectional area of the composite part is reduced in order to widen the above-mentioned spacing, the bulk density of the fiber molded body becomes high due to the predetermined number of constituent fibers of the fiber molded body. Therefore, the distance between the fibers becomes narrow, and the molten metal cannot be sufficiently filled between them, making it impossible to obtain the expected fiber reinforcing ability.

In view of the above, an object of the present invention is to provide the above-mentioned manufacturing method capable of obtaining high-quality fiber-reinforced compound compound,
The cross-sectional shapes of the fiber molded body and the composite part are approximately similar, the distance between the outer peripheral surface of the fiber molded body and the inner peripheral surface of the composite part is set to 2 or more, and the (j'4 cross-sectional area of the fiber molded body is It is set to 25% or more of the cross-sectional area of the section!It has two characteristics.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Figure 2 shows a high-pressure solidification casting apparatus used for casting connecting rods for internal combustion engines whose frames are reinforced with fibers, and the mold M includes a fixed lower mold 1 and an upper mold that can be raised and lowered relative to the lower mold 1. 2, and by the combination of both dies 1 and 2, a sprue 3, a gaviday 4 for forming a connecting rod, and a sump 5 are sequentially formed from the left side in FIG. The cavity 4 has a large end molded part 4a that communicates with the sprue 3 through a gate 61, a small end molded part 4b that communicates with the sump 5 through a gate 62, and both parts 4a and 4h. As a composite part, the cross section is circular, and the frame part molding part 4C and the other part,
The water reservoir portion 5 can keep the small volume of the small end molded portion 4b warm.

The lower mold 1 includes a core 7 for forming a piston pin hole, the tip of which is inserted into the small end molding portion 4h. is provided, and its core 71
One end of the reinforcing round fiber molded body F is press-fitted into a groove 8 formed at the tip of the rod, and the cantilevered molded body F1 extends into the rod molded part 4c. The fiber molded product F is molded to a desired bulk density using fibers such as metal fibers.

As shown in FIG. 3, the cross-sectional shapes of the fiber molded body F and the frame molded part 4C are both circular and substantially similar, and the fiber molded body 1'
The distance l between the outer circumferential surface of °1 and the outer circumferential surface of the scale molded part 4C is 27f.
i+π or more, and the cross-sectional area of the fiber molded body 1"1 is set to be 25 times or more of the cross-sectional area of the frame molded part 4C.

The lower mold 1 is provided with a crank bottle hole forming core 72 whose tip end extends into the large end molding portion 4a.

A molten metal supply pipe 9 is connected to the sprue 13 so as to be inclined downwardly toward the sprue 3 thereof. A hopper 11 is attached to the molten metal supply pipe 9 so that molten metal can be supplied to the sprue 3 via the hopper 11 and the molten metal supply pipe 9. A seal plunger 12 that seals the inside of the pipe 9 after supplying the molten metal to the sprue 3 - 1 is slid onto the molten metal supply pipe 9 .

The lower mold 1 includes a plunger 1 with its tip inserted into the sprue 3.
3 are slidably provided, and the upper die 2 includes local pressing bunches 14. 14, 14. ~14. is slidably provided.

When casting a connecting rod, after the molten aluminum alloy (hff) is supplied to the sprue 3, the inside of the molten metal supply pipe 9 is sealed by the seal plunger 12. Next, the plunger 13 is lifted and removed to fill the cavity 4 and the sump 5 with molten metal, and then the molten metal is initially pressurized to a pressure of approximately 600 kg.

When filling the molten metal, the cross-sectional shapes of the fiber molded body 1.1 and the frame molded part 4C are similar, and the distance between the two F+ and 4c is set to 2 mm or more, so the molten metal is filled between them. The molten metal flows smoothly in a laminar flow state, and the molten metal is cooled from the fiber molded body p4 and the frame molded part 4C, so that there is no formation of a melt boundary.

Then, the molten metal is held under the pressure for 1 to 10 seconds, and when the molten metal becomes semi-solidified, each locally pressurized bunch 1. '4
, ~' 143 pressure 1000~2500kgA-
Locally pressurize the large end and small end molded parts 4a, 4b and the sump 5 with nl, and at the same time pressurize the sprue 3 with a pressure of 1000 to 20 ok using the plunger 13 to perform secondary hIJ pressure. , fill the fiber molded body F1 with molten metal jj
The molten metal is completely solidified under this pressurized condition.

At the time of this filling and compounding, the cross-sectional area of the fiber molded body F1 is set to 25% or more of the cross-sectional area of the frame molded part 4c.
The bulk density of the fiber molded body I° becomes an optimum value, and the molten metal is easily filled between the constituent fibers.

A connecting rod material is obtained through the above process, and by performing predetermined machining on this material, the large end 15σ and the small end 15b shown in FIGS. 4 to 6 are connected, and a fiber-reinforced frame is formed. Part 15 (connecting rod 1 with
You can get it.

FIG. 7 shows an example in which the cross-sectional shapes of the fiber molded body F2 and the frame molded portions 4c/' are each formed into a rectangular shape, and FIG. This is an example of the formation. In addition, the present invention can be applied to cases where the shapes of the two transverse helmets are substantially similar.

Note that the present invention is applicable not only to connecting rods but also to the manufacture of long fiber-reinforced composite members.

As described above, according to the present invention, the cross-sectional shapes of both the fiber molded body and the composite part, the distance between the outer peripheral surface of the fiber molded body and the composite part inner peripheral surface, and the ratio of the cross-sectional areas of the fiber molded body and the composite part are specified. By doing so, it is possible to obtain a high-quality fiber-reinforced composite member that does not cause melting and has excellent molten metal filling and composite properties.

[Brief explanation of the drawing]

Figure 1 is a longitudinal sectional front view of the high-pressure solidification casting equipment for connecting rods.
Figure 2 is a view from the ■-■ arrow in Figure 1, and Figure 3 is a view from Figure 1 III.
-III line sectional view, Fig. 4 is a plan view of the connecting rod, Fig. 5
The figure is a sectional view taken along the line V-V in Figure 4, and Figure 6 is a cross-sectional view taken along the line Vl-V in Figure 4.
L-line cross-sectional view, 7th. FIG. 8 is a sectional view of a modified example taken at the same position as FIG. 3. l"1 to l゛°3...Fiber molded body, M...Mold, 4
...Cavity, 4 C, 4C', 4C'... Frame molding part as a composite part Patent applicant Honda Motor Co., Ltd.

Claims (1)

[Claims] The fiber-reinforced composite part is manufactured by applying a high-pressure solidification casting method, in which the molten metal filled in the cavity of the mold is pressurized with high hydrostatic pressure to fill and compose the rod-shaped fiber molded body disposed in the composite part of the cavity. In the manufacturing method, the cross-sectional shapes of the fiber molded body and the i-composite portion are substantially similar, the distance between the outer circumferential surface of the fiber molded body and the outer circumferential surface of the composite portion is set to 2 mm or more, and A method for manufacturing a fiber-reinforced composite part, characterized in that the cross-sectional area of the molded body is set to 25% or more of the cross-sectional area of the composite part.