发明名称 |
METHOD OF MANUFACTURING UMBRELLA PORTION OF HOLLOW ENGINE VALVE, AND HOLLOW ENGINE VALVE |
摘要 |
Forming of a valve head portion (1) of a hollow engine valve (V) comprising a material particularly satisfactory in heat resistance is performed by cold forging. On this occasion, the material with excellent heat resistance is worked to form a valve head portion semifinished product (11) having a hollow hole (Sll) whose inner diameter (Æ11) is equal to the maximum inner diameter (Æ 11) of a hollow hole (Sl) of a finished product of the valve head portion (1), and having a diameter-increased section (111) whose maximum outer diameter (Æ 12) is equal to the maximum outer diameter (Æ12) of a diameter-increased section (la) of the finished product. Parts of the valve head portion semifinished product other than a central part to a lower part of the diameter-increased section (111) are necked down by cold forging performed a plurality of times to obtain the finished product of the valve head portion (1). This method of obtaining the finished product is provided by the present invention. |
申请公布号 |
KR20110059617(A) |
申请公布日期 |
2011.06.02 |
申请号 |
KR20117006196 |
申请日期 |
2009.09.17 |
申请人 |
MITSUBISHI HEAVY INDUSTRIES, LTD.;YOSHIMURA COMPANY |
发明人 |
YOSHIMURA HYOJI |
分类号 |
F01L3/14;F01L3/24 |
主分类号 |
F01L3/14 |
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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