发明名称 |
METHOD FOR MANUFACTURING HOLLOW ENGINE VALVE |
摘要 |
A method for manufacturing a hollow engine valve includes inserting a half-finished hollow shaft section in sequence into die holes which have different hole shapes, and sequentially drawing so as to reduce the outer diameter and the inner diameter of the hollow shaft section and stretch its length in stages. The half-finished product is subjected to heat treatment so that the hardness thereof is lower than or equal to a predetermined level. A shaft end sealing section is formed by increasing the wall thickness of the opening end of the hollow shaft section toward the inside of the opening and the gap in the shaft end sealing section is welded.
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申请公布号 |
US2012304464(A1) |
申请公布日期 |
2012.12.06 |
申请号 |
US201013519813 |
申请日期 |
2010.10.06 |
申请人 |
MORII HIROKAZU;YOSHIMURA HYOJI;YOSHIMURA COMPANY;MITSUBISHI HEAVY INDUSTRIES, LTD. |
发明人 |
MORII HIROKAZU;YOSHIMURA HYOJI |
分类号 |
B21K1/22 |
主分类号 |
B21K1/22 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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