发明授权
- 专利标题： Method for manufacturing a piston
- 专利标题（中）： 活塞制造方法
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申请号： US310790申请日： 1989-02-14
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公开(公告)号： US4918806A公开(公告)日： 1990-04-24
- 发明人: Ryuji Watanabe , Motohiko Kosano , Hirokazu Kawakami
- 申请人： Ryuji Watanabe , Motohiko Kosano , Hirokazu Kawakami
- 申请人地址： JPX Osaka
- 专利权人： Sanyo Electric Co., Ltd.
- 当前专利权人： Sanyo Electric Co., Ltd.
- 当前专利权人地址： JPX Osaka
- 优先权： JPX63-35674 19880218
- 主分类号： B23P15/10
- IPC分类号： B23P15/10 ; C21D9/00 ; C23C8/26 ; F02F3/10 ; F16J1/02 ; F16J1/04
摘要：
In a method for manufacturing a piston a metal piston is prepared which has a skirt tapered towards the bottom end to such an extent that a diameter of the metal piston becomes uniform after a heat treating step. The metal piston is heat treated in a gas containing nitrogen and carbon to form a nitride film layer on the outer surface of the piston and to transform the skirt.
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