JPH0237262B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for manufacturing an aluminum composite in which a part of a mechanical part made of an aluminum alloy is reinforced with metallic fibers.

(Prior art) Generally speaking, mechanical parts such as the tappets of automobile engines, whose sliding parts are subject to severe wear, are made from chilled cast iron materials or carburized and quenched steel materials from the standpoint of wear resistance. Applied. However, in recent years, there has been a need to improve the engine speed limit and reduce the amount of drift during reciprocating motion of the tapepet, so there is a demand for a lighter machine part. No suitable metal materials have been put to practical use.

On the other hand, as disclosed in, for example, Japanese Unexamined Patent Publication No. 55-24763, an aluminum composite is formed by compositely reinforcing the slipper surface of a rocker arm made of a light alloy such as an aluminum alloy with an inorganic fiber molded body with a random orientation direction. The body is known.

(Problem to be Solved by the Invention) However, in the above composite, since the direction of orientation of the reinforcing fibers is random regardless of the direction of the load acting on the sliding part, There is a problem in that the reinforcing fibers, which are arranged substantially perpendicular to the direction of the load acting on the sliding portion, may peel off, making it impossible to sufficiently improve wear resistance.

The present invention has been made in view of these problems, and it is possible to reduce the weight of machine parts by manufacturing them from aluminum alloy, and to provide a sliding part that comes into pressurized contact with other members of the machine part. It is an object of the present invention to provide a method for producing an aluminum composite which has wear resistance by providing a fiber composite in which almost all the fibers are arranged substantially parallel to the direction of the load acting on the part.

(Means for Solving the Problem) In order to achieve the above object, the solution of the present invention is a rod-shaped fiber composite made of an aluminum alloy and long fibers of inorganic or metallic material, and the long fibers are arranged in the longitudinal direction. The fiber composite is cut at right angles to the fiber arrangement direction to make chips of a predetermined length, and the chips are set in a mold, and then an aluminum alloy is poured into the mold. By casting the chip into the sliding part of an aluminum alloy machine part, the sliding part is reinforced with inorganic or metallic fibers, and the fibers are in a direction approximately parallel to the direction of the load acting on the sliding part. They are characterized by being arranged in parallel.

(Function) Accordingly, in the present invention, the sliding portion of the mechanical component made of aluminum alloy that comes into pressure contact with other members is reinforced with inorganic or metallic fibers, and Almost all of them are arranged almost parallel to the direction of the load acting on the sliding part, so it is easy to obtain a lightweight aluminum composite with sufficiently improved wear resistance without causing fiber plucking. be able to.

(Example) Examples of the present invention will be described in detail below.

An example of the structure of the aluminum composite is shown in FIG. In the figure, reference numeral 1 is an aluminum composite formed on the tappet of an automobile engine, and the shaft portion 2 is made of an aluminum alloy (for example, Si22 in Al).
%, Cu4.6%, Mg0.3%, Fe1.0%, Mn0.3%,
(0.2% Ni, 0.1% Sn), and alumina fibers 5, 5...
A fiber composite body 6b, 7b with a circular cross section reinforced with is cast. The alumina fibers 5, 5... of each fiber composite have a wire diameter of 10μ and a fiber density of, for example,
30 to 50%, and almost all of them are arranged approximately parallel to the direction of the load (arrows F ₁ , F ₂ ) acting on each sliding portion 3, 4.

Incidentally, the fiber composites 6b, 7b may be made of carbon fiber or ceramic fiber instead of the alumina fibers 5, 5, . . . of this example.

Since the shaft part 2 of the above aluminum composite 1 is made of an aluminum alloy, it can be used in mechanical parts such as tappets by 50% or more compared to conventional chilled cast iron materials, carburized and hardened steel materials, etc. It is possible to reduce weight, thereby reducing the spring force of the valve spring, and also to reduce the amount of drift by 10%, which has the effect of improving engine rotation and reducing noise.

In addition, each sliding portion 3, 4 is made of alumina fiber 5, 5.
... is formed by fiber composites 6b, 7b with almost all of them parallel to the direction of load, so the alumina fibers 5, 5... located on the surface of each sliding portion 3, 4 may be peeled off, etc. This prevents the occurrence of oxidation and provides excellent abrasion resistance. Incidentally, the fiber composite 6
When test specimens having the same quality as those in Example No. b and No. 7b were subjected to characteristic tests using the testing apparatus shown in FIG. 7, favorable results were obtained. In other words, a test fixed piece Pf with a friction area of 9 mm ²
and rotating piece Pr (size 100mm〓×10mm disk, speed 9.2
m/s, hardness Rc61~62, roughness 3s, material Cr22
Lubricating oil R-ATF using carburizing and quenching)
(M2C33F) Wet pin at 40℃ test condition,
Seizure characteristics using desk method (Figure 6), load 100Kg (high load acceleration test), rotation speed 3000r.p.
m, time 20Hr, lubricating oil 10W-40 (light oil 20%) oil temperature
In the wear test using motoring under test conditions of 80℃ (Fig. 5), both showed values close to those of chilled cast iron, so we applied it to each sliding part 3 and 4 to ensure its durability. There are promising effects.

Furthermore, even when comparing a fiber molded body made of the same randomly oriented alumina fibers as in the above example with a conventional fiber composite made of the same aluminum alloy as in the above example, the results of the above example The fiber composite has excellent anti-seizure and anti-wear properties.

Next, a method for manufacturing the aluminum composite 1 will be explained based on FIGS. 1 to 3.

First, in advance, alumina long fibers with a wire diameter of 10μ are arranged in the longitudinal direction, and an aluminum alloy (for example, Si22,
Cu4.6%, MgO0.3%, Fe1.0%, Mn0.3%, Ni0.2
%, Sn0.1%) and the diameter is 20mm, respectively.
10 mm rod-shaped fiber composites (FRM) 6a, 7a are formed (Fig. 1a, b).

Next, from the rod-shaped fiber composites 6a, 7a, the chip-shaped fiber composites 6 adapted to each of the sliding portions 3, 4 are
b, 7b and perform preliminary processing (Fig. 2a,
b).

Subsequently, the chip-shaped fiber composites 6b, 7b are set inside a mold for forming the shaft portion 2, and cast into a mold by a die-casting method (FIG. 3). in this case,
Since the impregnated material of the fiber composites 6b, 7b and the shaft portion 2 of the aluminum composite 1 are made of the same aluminum alloy, they easily come into close contact with each other and have good compatibility.

Finally, the sliding surfaces of each fiber composite 6b, 7b are machined to finish the product (FIG. 4).

As mentioned above, the rod-shaped fiber composites 6a and 7a can be mass-produced and stocked according to each shape.
Further, since the chip-shaped fiber composites 6b, 7b can be easily cast by die casting or molten metal casting, they have the effect of improving the productivity of machine parts such as tapepets.

(Effects of the Invention) As described above, according to the method for producing an aluminum composite of the present invention, it is possible to easily produce an aluminum composite that does not cause fiber plucking and has sufficiently improved wear resistance and weight reduction. And it can be manufactured at low cost.

[Brief explanation of drawings]

The drawings illustrate embodiments of the present invention, and FIGS. 1 and 2 are external perspective views of the fiber composite material and casting material, respectively, and FIGS. 3 and 4 are casting molding of the aluminum composite, respectively. Figures 5 and 6 are graphs showing the amount of wear and seizure characteristics of the fiber composite, respectively, and Figure 7 is a schematic diagram of the wear test device. be. DESCRIPTION OF SYMBOLS 1... Aluminum composite, 3... Cam sliding part, 4... Push rod sliding part, 5... Alumina fiber, 6a, 6b... Fiber composite, 7a, 7
b...Fiber composite, F, _F1 , _F2 ...Load direction.

Claims (1)

[Claims] 1. A rod-shaped fiber composite is made of an aluminum alloy and inorganic or metallic long fibers, and the long fibers are arranged in the longitudinal direction, and the fiber composite is cut at right angles to the fiber arrangement direction to a predetermined length. After making a chip and setting the chip in a mold, aluminum alloy is poured into the mold and the chip is cast into the sliding part of an aluminum alloy machine part to make the sliding part. A method for manufacturing an aluminum composite, characterized in that the portion is reinforced with inorganic or metallic fibers, and the fibers are arranged substantially parallel to the direction of the load acting on the sliding portion.