JPS6293058A - Production of composite member - Google Patents

Abstract

PURPOSE:To additionally improve the wear resistance of a metallic porous body part by providing the self-lubricity by carbon to the metallic porous body part in the stage of subjecting the metallic porous body formed by utilizing a synthetic resin foam to insert casting with a desired metal. CONSTITUTION:A molding formed of the synthetic resin foam 1 is subjected to an electrical conducting treatment to form a conductive film 2 on the surface of the skeletal part thereof. Different polarities are thereafter provided between the film 2 and a metal having wear resistance, for example, Ni and a plating layer 3 of Ni is formed on the film 2 to obtain the metallic porous body B. Such body is heated at and for the prescribed temp. and time in a reducing atmosphere of H2, etc. to carbonize the foam 1 and the film 2 so that the carbon 4 obtd. by the carbonization is made to remain (disperse) in the inside surface of the layer 3. The metal constituting the base metal, for example, Al alloy is cast to such body by a high-pressure solidification casting method, etc. The porous body B is then insert-cast by the metal 5 and the composite member dispersed with the carbon 4 in the metal 5 is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for manufacturing a composite member that utilizes the self-lubricating properties of carbon to further improve wear resistance.

(Prior Art) Recently, there have been an increase in the number of composite members in which only predetermined portions of a metal base body are partially formed of different metals in order to improve wear resistance. For example, while the base body of a piston in an internal combustion engine is made of an aluminum alloy, the piston link carrier portion that holds the top ring, which is subject to large repeated loads, is made of a metal porous body made of, for example, nickel, as shown in Japanese Patent Publication No. 5O-Z5EXC+. A composite member has been proposed in which a composite member is constructed by casting a base material around the base material.

Conventionally, as a method for obtaining such a composite member, first,
In order to obtain the above-mentioned porous metal body, (1) conductive treatment of the synthetic resin foam (porous body) to form a conductive film on the surface as a pre-plating treatment, and then (2) use a hard, wear-resistant metal such as nickel. Electroplated by (
After exposure, an oxidation treatment is performed to burn off the synthetic resin foam and the conductive film, and finally, a reduction treatment is performed to remove the oxide film on the hardened wear-resistant metal surface. A porous body of abrasive metal is formed. Then, by casting the metal porous body thus formed with a metal constituting the base body, such as an aluminum alloy, the metal porous body and the base body are firmly integrated.

(Problems to be Solved by the Invention) By the way, the parts that require wear resistance are the parts that receive sliding or repeated loads from normal members. Therefore, in order to improve this wear resistance, it is more preferable to have not only 1ilF# wear resistance simply by improving hardness, but also self-lubricating properties if possible. .

Therefore, it is an object of the present invention, when the wear-resistant part is made of a porous metal material, to provide the porous metal part with self-lubricating properties due to carbon, so that even more wear resistance can be obtained. An object of the present invention is to provide a method for manufacturing a composite member.

(Means and operations for solving the problem) In order to achieve the above-mentioned object, in the present invention, when forming a porous metal body using the synthetic resin foam described in 1iii. The carbon component contained in the foam and the conductive film for electro-scaling treatment is effectively utilized as it is, and this carbon component is dispersed and present in areas where abrasion resistance is required. Specifically, 1: performing conductive treatment on a molded body made of synthetic resin foam to form a conductive film; plating the conductive film of the molded body with a wear-resistant metal; and the metal plating. forming a metal porous body in which carbon is dispersed by subjecting the molded body to a reduction treatment in a non-oxidizing atmosphere; and casting the metal porous body with a desired metal. .

With this structure, carbon is dispersed in the parts where wear resistance is required, and the abrasive metal obtained by plating and the self-lubricating property of this carbon combine, The key is to obtain a composite member that has excellent wear resistance as a whole.

(Example) Examples of the present invention will be described below based on the attached drawings.

Figures 1 to 5 are diagrams showing the principle of the present invention in the order of its main steps, and these Figures 1 to 5 will be explained in comparison with the process diagram (processes 11 to 16) in Figure 6. . First of all,
In FIG. 1, reference numeral 1 denotes a synthetic resin foam made of, for example, urethane foam, which, as is known, has a skeleton portion 1a and a large number of voids 1b. The skeleton portion 1a is appropriately fractured by the cracking treatment, and is formed to have a desired porosity. Then, such a synthetic resin foam 1 is molded into an appropriate shape, for example, a ring shape, depending on the shape of the part where wear resistance is required (Step 11) 6 Figure 2 is similar to Figure 1. This figure shows the cross-sectional shape of the skeleton part 1a of the synthetic resin foam 1 shown in FIG. A thin film containing the above is formed (Step 12).

After this, conductivity 1! ! By giving mutually different polarities between i 2 and a wear-resistant metal such as nickel, a metal porous body B is formed in which a plating layer 3 made of a wear-resistant metal is formed on the conductive film 2. (Step 13).

Further 2. F, record..., the one in which the Ki layer J was formed,
For example, in a reducing atmosphere using H2 and at a temperature of 600 to 800°C.
By heating with V for 1 hour at a temperature of (Step 14).

For the above-mentioned carbon remaining, for example, a matrix such as aluminum Kotsu J4 alloy (e.g. A, C8A) etc. ・5
When the metal 5 is cast by the solidification casting method, as shown in FIG. The obtained carton 4 is dispersed in the metal 5 (step 15).In addition, when the metal 5 is AC8A, the above-mentioned high-pressure solidification casting is performed at a temperature of 700°C and a pressure of 8A.
It may be carried out at 00 kg/cm2.

Finally, a final product C is obtained by performing a hardening treatment (T6 treatment) that is normally performed on aluminum alloys. In addition, during this hardening treatment, an intermetallic compound between the metal 5 and the plated metal 3 (
AfL-Ni compound) is produced to strengthen the bond, and since the Ajl-Ni compound has high hardness, it improves wear resistance and set resistance (Step 16). For this, after step 15, 450-55
Heat and hold at 0°C for 1 to 10 hours, then water quench (
Solutionization of the base material (metal 5) made of aluminum alloy),
Tempering can be performed sequentially.

Here, a test example will be described in which the wear resistance of a carbon-containing product of the present invention was compared with a conventional product that does not contain carbon. First, a nickel porous body was used as the metal porous body B (the porosity was 8% by volume, and the carbon content was 1.5% by volume only for the product of the present invention), and the metal surrounding this nickel porous body was Aluminum alloy (A C8A
) was used. In addition, the casting in step 15 in Fig. 6 is 7
00℃, 800kg/cm2 pressure casting, No. 6
The heat treatment (T6 treatment) in step 16 in the figure is performed by 510°C × 5 hours of compaction treatment + water quenching, and then 180°C × 6 hours of artificial aging treatment + air cooling.
-Ni compound was produced.

The composite members obtained as described above, both the inventive product and the conventional product, were 3 mm thick and 10 mm long.

And the tip surface has a radius of 3 mm over its entire length (10 mm)
A test piece with a convex surface was formed. Each test piece (the tip end surface thereof) was pressed against a slider disk under the following conditions, and the degree of wear was compared. The material of the slider disc is cast iron (C3.5% Si2.0%
MnO, 7% F0.10% or less So, 10% or less
Cr0.2% (balance Fe), test piece pressing load 1.5 kg, @sliding condition without lubrication, circumferential speed of slider disk at test piece pressing part 5.17 m/s
, test time is 20 minutes. As a result of this abrasion test, the conventional product wore 60 IL, but the product of the present invention wore only 40 IL, confirming that the carbon-containing product of the present invention has superior wear resistance.

Next, referring to FIGS. 7 to 10, a case will be described in which the product C as a composite member is a piston for an internal combustion engine, and the ring carrier portion for holding the top ring is made to have wear resistance.

FIG. 7 shows a piston 21 as a composite member C obtained by the present invention, and its side peripheral surface has three ring grooves 22, 23, and 24 in order from the top. Of these three ring grooves 22.23.24, the upper two ring grooves 22.2
3 is used for the gas ring, and the lowermost ring groove 24 is used for the oil ring. The top ring 22 located at the uppermost position is formed into a structure as shown in FIG. 5 in a molded body 25 using a metal porous body having abrasive properties.

Based on the above, the molded body 25 made of the synthetic resin foam 1 formed into a ring shape as shown in FIG. 8 is subjected to conductive treatment (step 12) and plating treatment (step 13). ), a reduction treatment is performed (step 14). The molded body 25 after this reduction treatment is divided into a split mold S1,
The molded body 25 is set at a predetermined position in the casting mold S made up of S2 and S3, and then a desired molten metal 5, such as aluminum or aluminum alloy, is cast into the cavity 26 in the casting mold S. Both 25 and 5 (
26) are integrated (step 15). Then, T6 treatment (total living compound generation treatment) is performed (step 16),
The molded body 25 and the base body 1 (metal 5) are more strongly integrated, and the high hardness intermetallic compound improves wear resistance and set resistance. By forming the top ring groove 22 by machining the molded body 25 integrated with the base body in this manner, a piston 21 as a product C as shown in FIG. 7 is obtained.

Although the embodiments have been described above, the present invention is not limited to these, for example, the pawl of a shift fork in a Schilling litchi, a brake disc, a gear type transmission, the inner surface of a cylinder of a brake or clutch master ring, etc., which require wear resistance. It can be similarly applied to various members. In addition, the carbon 4 remaining in step 14
The ratio can be easily adjusted by adjusting the thickness of the conductive film 2 in step 12. Of course, the porosity of the metal porous body B can also be easily adjusted.

(Effects of the Invention) As is clear from the above, the wood invention is even more advantageous in terms of improving wear resistance because it further provides self-lubricating properties with carbon to the wear-resistant metal porous body portion. A composite member can be obtained.

In addition, the carbon for self-lubricating properties may be directly used as the material used to obtain the wear-resistant metal porous body.
Since it can be effectively utilized, it is advantageous in terms of cost and manufacturing.

[Brief explanation of drawings]

Figures 1 to 5 are diagrams showing the main steps of the wood invention. Figure 6 is a blog diagram showing an example of the process of the invention. FIG. 7 is a partially sectional side view showing an example of a piston as a composite member according to the present invention. 8 to 10 are cross-sectional views showing the manufacturing process of the piston shown in FIG. 7. B: Metal porous body C: Product (composite member) S: Split synthetic resin foam 2: Conductive film 3: Plating layer 4: Carbon 5: Metal (base body) 21: Piston (composite member) 22: Ring groove 25: Molded body (carbon dispersed fully bent porous body) 27: Base body Fig. 1 Fig. 4 Fig. 5 Fig. 7 Fig. 9 Fig. 10

Claims (1)

[Claims] (1) A step of performing conductive treatment on a molded body made of synthetic resin foam to form a conductive film; a step of plating the conductive film of the molded body with a wear-resistant metal; and a step of plating the conductive film of the molded body with a wear-resistant metal. It is characterized by comprising the steps of: forming a metal porous body in which carbon is dispersed by reducing the molded body in a non-oxidizing atmosphere; and casting the metal porous body with a desired metal. Method for manufacturing composite parts.