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Title:
VALVE ELEMENT IN SWING VALVE, METHOD FOR MANUFACTURING THE SAME, AND REHEAT STEAM STOP VALVE HAVING THE VALVE ELEMENT
Document Type and Number:
Japanese Patent JP2013046918
Kind Code:
A
Abstract:

To provide sufficient impact absorbability to the connection part of a valve element in a swing valve and a swing arm.

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.


Inventors:
NISHIMURA TOSHIYA
FUKUYOSHI TAKASHI
Application Number:
JP2011185642A
Publication Date:
March 07, 2013
Filing Date:
August 29, 2011
Export Citation:
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Assignee:
MITSUBISHI HEAVY IND LTD
International Classes:
B21K1/24; B21J5/08; F01D25/00
Domestic Patent References:
JP2002048264A2002-02-15
JP2000117386A2000-04-25
JP2002356729A2002-12-13
JPS5835034A1983-03-01
JPS60102241A1985-06-06
JPH04351241A1992-12-07
JP2000135543A2000-05-16
JPS6415357A1989-01-19
JPH04351241A1992-12-07
JPS5835034A1983-03-01
JPS60102241A1985-06-06
JPS6415357A1989-01-19
JP2002048264A2002-02-15
JP2000117386A2000-04-25
JP2002356729A2002-12-13
JP2000135543A2000-05-16