Title:
RING MANUFACTURING METHOD
Document Type and Number:
Japanese Patent JP2015205305
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a ring manufacturing method which enables the omission of heat treatment for softening and the suppression of abnormal grain growth on carburization.SOLUTION: A hollow cylindrical steel material made of case hardening steel is heated to a temperature of a recrystallization temperature of the steel material (T(°C)+50°C or more and 1100°C or less. Next, the heated steel material is rolled by ring roll under the condition of a diameter enlarging ratio of 130% or more and 400% or less, and a processing termination temperature of T(°C) or more and 1000°C or less to obtain a ring. Further, the ring after rolling termination is cooled so that the average cooling rate in a temperature interval of 750°C to 600°C is 0.1°C/s or more and 1.0°C/s or less. The ring may be treated by carburization after cooling.
Inventors:
MIYACHI YUSUKE
YOSHIDA HIROAKI
FUJIWARA MASANAO
YOSHIDA HIROAKI
FUJIWARA MASANAO
Application Number:
JP2014086998A
Publication Date:
November 19, 2015
Filing Date:
April 21, 2014
Export Citation:
Assignee:
DAIDO STEEL CO LTD
International Classes:
B21H1/06; B21B5/00; C21D1/06
Domestic Patent References:
| JP2009208135A | 2009-09-17 | |||
| JPH09176740A | 1997-07-08 | |||
| JPH01205029A | 1989-08-17 | |||
| JPH0213004B2 | 1990-04-03 | |||
| JP2004250768A | 2004-09-09 | |||
| JPH10330847A | 1998-12-15 |
Attorney, Agent or Firm:
Fumio Hatakeyama
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