发明名称 INTERNAL-COMBUSTION ENGINE FORGED PISTON, MATERIAL AND MANUFACTURING METHOD FOR THE SAME
摘要 PROBLEM TO BE SOLVED: To provide a method for manufacturing an internal-combustion engine forged piston capable of improving mechanical properties in a side of last solidification surface, reducing variation of mechanical properties, improving efficiency of machining process and quality by using an aluminum alloy forging material fabricated by one-way coagulation. SOLUTION: This method for manufacturing the internal-combustion engine forged piston includes a process for fabricating forging material by casting molten aluminum alloy with one-way coagulation casting method, a process for pre-heating the forging material, a process for forging the forging material to a piston workpiece having 70% or more modulus of plastic working on a piston head surface and a projection part on a center of the piston head surface after storing the forging material in a die with making the one-way coagulation last solidification surface side face to a surface of the die foe making the piston head surface, and a process for machining the piston workpiece to the internal-combustion engine forged piston. COPYRIGHT: (C)2004,JPO
申请公布号 JP2004027922(A) 申请公布日期 2004.01.29
申请号 JP20020183763 申请日期 2002.06.25
申请人 SHOWA DENKO KK 发明人 SATO MASAHIRO;FUKUDA MASASHI
分类号 F02F3/00;B21J5/00;B21K1/18;B22D21/04;B22D27/04;C22C21/02;F16J1/01;(IPC1-7):F02F3/00 主分类号 F02F3/00
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