COMPOSITE COMPACTING METHOD FOR SUPERLIGHT, HIGH STRENGTH AND HIGH COOLING PISTON

摘要

PROBLEM TO BE SOLVED: To provide a method for producing a lighweight piston in which the cooling efficiency of the groove part of a top ring is good, and joining strength between the upper part of the piston and an aluminum alloy body is high, and to provide a piston obtained by the method.;SOLUTION: A salt core 19 is set on the upper groove of a casting 18 at the lower part of a piston using an AC8A material, powders 20 and 21 having good conductivity are charged tehreto, and are sintered at 500°C under the pressure of 50 MPa by plasma discharge. After the sintering, a drill hole 24 is bored from the inside, the salt core is dissolved with hot water and is allowed to flow out, thereby forming a cooling hole 23.;COPYRIGHT: (C)2001,JPO