发明名称 |
VALVE ELEMENT IN SWING VALVE, METHOD FOR MANUFACTURING THE SAME, AND REHEAT STEAM STOP VALVE HAVING THE VALVE ELEMENT |
摘要 |
<P>PROBLEM TO BE SOLVED: To provide sufficient impact absorbability to the connection part of a valve element in a swing valve and a swing arm. <P>SOLUTION: A method for manufacturing the valve element in the swing valve includes: a polygonal column forming step S10 of obtaining a polygonal column 130 formed of a heat-resistant steel by executing swaging and cogging of a steel block 100 of heat-resistant steel which is the base stock of a valve element 20; a stepped body forming step S20 of obtaining a stepped body 140 having a small diameter section 140b formed by executing tap forging of an end of the polygonal column and a large diameter section 140a; a disk-with-projection forming step S30 of obtaining a disk 150 with a projection by inserting the small diameter section in the stepped body in a hole 510 in a hole base 500, and swaging the stepped boy in its axial direction Z; and a machine-forming step S40 for machine-forming the disk with the projection so that a projection part 20b is formed from the small diameter part 150b in the disk with the projection, and a body 20a is formed from the large diameter part 150a. <P>COPYRIGHT: (C)2013,JPO&INPIT |
申请公布号 |
JP2013046918(A) |
申请公布日期 |
2013.03.07 |
申请号 |
JP20110185642 |
申请日期 |
2011.08.29 |
申请人 |
MITSUBISHI HEAVY IND LTD |
发明人 |
NISHIMURA TOSHIYA;FUKUYOSHI TAKASHI |
分类号 |
B21K1/24;B21J5/08;F01D25/00 |
主分类号 |
B21K1/24 |
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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