Method of manufacturing a clad material of bronze alloy and steel

Abstract

A manufacturing method of a clad material composed of a bronze alloy and a steel is provided, including: scattering a bronze alloy powder on a steel back metal; sintering the bronze alloy powder to obtain a bilayer material having a porous bronze alloy layer on the steel; dry-rolling and a sintering the bilayer material so that the bronze alloy layer has a porosity of 3% or less; and wet-rolling the bilayer material with supplying a rolling oil to surfaces of rolling rolls. The clad manufactured according to this method can be heat-treated without an disadvantage in a conventional wet-rolling that entering rolling oil vaporizes in the bronze alloy layer during the heat treatment to form new voids. Therefore, it becomes possible to make a bronze alloy layer high in density in small times of rolling, thus enabling an increase in production efficiency.

Description

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1A is a front view showing an end plate made of a clad material manufactured by a method according to the invention, used for a clutch of an automatic transmission for automobiles; and

FIG. 1B is a cross sectional view taken along the line A-A in FIG. 1A.

Claims

1. A method of manufacturing a clad material composed of a bronze alloy and a steel, the method comprising: scattering a bronze alloy powder on a steel back metal;sintering the bronze alloy powder to obtain a bilayer material having a porous bronze alloy layer on the steel;dry-rolling and a sintering the bilayer material so that the bronze alloy layer has a porosity of 3% or less; andwet-rolling the bilayer material with supplying a rolling oil to surfaces of rolling rolls.

2. The method according to claim 1, wherein the bronze alloy is a Cu—Sn based alloy or a Cu—Sn—P based alloy.

3. The method according to claim 1, wherein the steel back metal is made of a low-carbon steel.

4. The method according to claim 1, wherein a paraffinic lubricating oil is used as the rolling oil in the wet-rolling.

5. The method according to claim 2, wherein the steel back metal is made of a low-carbon steel.

6. The method according to claim 2, wherein a paraffinic lubricating oil is used as the rolling oil in the wet-rolling.

7. The method according to claim 3, wherein a paraffinic lubricating oil is used as the rolling oil in the wet-rolling.