JPS5846133A - Production of one directional fiber tow for reinforcement - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a method for producing a reinforcing unidirectional fiber bundle.

The present inventor first arranges a unidirectional fiber bundle at a predetermined location of a member, and then fills and composites a light alloy as a matrix into the unidirectional fiber bundle using a high-pressure solidification casting method to manufacture a fiber-reinforced composite member. proposed a technology.

As the unidirectional fibers, metal fibers such as stainless steel, non-metallic inorganic fibers such as silicon carbide, carbon, alumina, etc. are used.

Considering the ease of handling the fibers and the ease of installing them in a mold during the production of composite members, it is convenient to form the fibers into fiber bundles in advance, and also to reduce the weight of the composite member. For this reason, it is advantageous to use non-metallic inorganic fibers that have a lower specific gravity than metal fibers.

However, since the above-mentioned nonmetallic inorganic fibers have a relatively high melting point and stable physical properties, they have a problem of poor partial diffusion bonding properties by heating and poor formability as a fiber bundle. Furthermore, when manufacturing composite parts, it is desirable to heat the fibers and retain residual heat before filling them with the matrix in order to improve the composite properties of filling between the +J lux fibers. Fibers have poor thermal conductivity, so they cannot retain residual heat sufficiently, and even after composite parts are manufactured, nonmetallic inorganic fibers have a lower coefficient of thermal expansion than the matrix, so the residual stress in the matrix is reduced. However, there is also the problem that there is no effective means of removing the dog.

In view of the above-mentioned problems, the present invention has developed a unidirectional fiber bundle that is mainly made of non-metallic inorganic fibers, is lightweight, has good residual heat retention, and is capable of removing residual stress in the matrix after composite. For the purpose of easily obtaining unidirectional nonmetallic inorganic fibers, metal fibers or nonmetallic inorganic fibers having a metal coating are added thereto and bundled, and the metal fibers or nonmetallic inorganic fibers having a metal coating are interleaved with each other. It is characterized by partially combining.

Examples will be described below.

〔Example〕

As shown in Figure 1, the outer periphery of a bundle of 306,000 alumina fibers F8 with a diameter of lOμ is
Covered with 2μ stainless fiber (JIS symbol 5US32) F, the bundled fibers F1, E are placed in a heat-resistant tube P made of quartz glass or the like having an elliptical cross section.

Insert and bake at 700℃ for 10 minutes to create stainless steel fiber F.
, by partially diffusion bonding between them, the weight is reduced to 19
．． 1g has a major axis of 12yll, a minor axis of 9゜2, and a length of 1361cm.
A unidirectional fiber bundle F having an oval cross section of 1111 was formed.

Next, the unidirectional fiber bundle F is placed between the cores for forming the small end hole and the large end hole in a mold for a connecting rod for an internal combustion engine, and is subjected to high-pressure solidification casting using an aluminum alloy (JIS symbol AC4D) M as a matrix. A connecting rod 1 shown in FIG. 2 was cast by the method.

This connecting rod 10 rod part 2, small end part 3 and large end part 4
The side portion of the frame 2 is fiber-reinforced by filling and compounding the aluminum alloy M into the unidirectional fiber bundle F during high-pressure solidification casting.

In the connecting rod 1, the minimum cross-section/area A of the rod portion is 209°2, and the unidirectional fiber bundle F in the cross-sectional area A is
The volume content Vf of is 16.4%, of which the alumina fiber F is 11.5% and the stainless fiber F is 24.9%, which is a ratio of approximately 7:3. In addition, in the cross section of the rod part, when the Y axis is parallel to the center line direction of the small end hole and the Y axis is perpendicular to the Y axis, the moment of inertia around the Y axis in the entire cross section is Iy = 1,7001z', and the moment of inertia around the X axis in the entire cross section is IZ = 7,
At 630I11'.

The relationship is Is>Iy.

As mentioned above, the weight of the unidirectional fiber bundle F is 19.15, and the stress reduction rate at the minimum cross-sectional area of the frame after composite is 34.2.
%. On the other hand, a unidirectional fiber bundle of the same shape as above, consisting only of stainless steel fibers with a diameter of 12μ, weighs 36. sy, the stress reduction rate at the minimum cross-sectional area of the frame after composite is 20°7. Therefore, the unidirectional fiber bundle F according to the present invention is lighter in weight and has an improved stress reduction rate than a single metal fiber bundle.

In the production of unidirectional fiber bundles, the fiber blending method involves uniformly dispersing and mixing metal fibers into the main non-metallic inorganic fibers, or forming a metal film on the non-metallic inorganic fibers by plating, etc. It is possible to adopt means such as uniformly dispersing and mixing it into the main non-metallic inorganic fibers, or coating the outer periphery of the main non-metallic inorganic fibers with the non-metallic inorganic fibers having the metal coating. As a method for partially bonding metal fibers or nonmetallic inorganic fibers having a metal coating, in addition to the diffusion bonding by firing, bonding means such as filter welding can be employed.

As described above, according to the present invention, unidirectional nonmetallic inorganic fibers are mainly used, metal fibers or nonmetallic inorganic fibers having a metal coating are added thereto, and the metal fibers or nonmetallic inorganic fibers having a metal coating are bundled. Since they are partially bonded to each other, it is possible to easily form a lightweight unidirectional fiber bundle mainly composed of non-metallic inorganic fibers, which is therefore effective in reducing the weight of fiber-reinforced composite members. It is.

Furthermore, since the unidirectional fiber bundle obtained by the present invention contains a metal or a metallic component therein, the unidirectional fiber bundle is heated to retain sufficient residual heat prior to IJ lux filling composite to form a matrix. It is possible to improve the filling composite properties, and it is also possible to heat the filled composite part of the unidirectional fiber bundle after producing the composite member, thereby making it possible to remove residual stress and force in the matrix.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing a state in which fibers are inserted into a heat-resistant tube in a practical example of the present invention; It is a cross-sectional view. F, ... Alumina fiber as a nonmetallic inorganic fiber, F,
...Patent applicant for stainless steel fiber as metal fiber Honda Motor Co., Ltd. Figure 1 Figure 2

Claims (1)

[Claims] = Directional Nonmetallic inorganic fibers are the main component, and metal fibers or nonmetallic inorganic fibers having a metal coating are added thereto and bundled, and the metal fibers or nonmetallic inorganic fibers having a metal coating are partially bonded to each other. A method for producing a fiber bundle for reinforcing.