Title:
HEAT TREATMENT SYSTEM
Document Type and Number:
Japanese Patent JP2005133211
Kind Code:
A
Abstract:
To restrain the unevenness of heat treatment quality in each steel-made part and the variation of heat treatment quality among the steel-made parts.
A heater 21 in a secondary heat treatment apparatus 2, is constituted of a high frequency heating apparatus for heating a bearing part by induction heating (high frequency heating). In the heater 21, each bearing part is heated piece by piece at the temperature exceeding an A1 transformation point for a predetermined time. Since each bearing part is heated piece by piece, the unevenness of the heat treatment quality in each bearing part and the variation of the heat treatment quality among mutual bearing parts, are reduced.
Inventors:
NAKAJIMA HIROKAZU
MAEDA KIKUO
MAEDA KIKUO
Application Number:
JP2004296163A
Publication Date:
May 26, 2005
Filing Date:
October 08, 2004
Export Citation:
Assignee:
NTN TOYO BEARING CO LTD
International Classes:
F16C33/32; C21D1/06; C21D1/18; C21D9/40; C22C38/00; C22C38/46; F16C33/34; F16C33/64; (IPC1-7): C21D9/40; C21D1/06; C21D1/18; F16C33/32; F16C33/34; F16C33/64
Attorney, Agent or Firm:
Shogo Ehara
Hideka Tanaka
Yoshiyuki Shiraishi
Kunihiko Shiromura
Tsuyoshi Kumano
Hiroaki Yamane
Hideka Tanaka
Yoshiyuki Shiraishi
Kunihiko Shiromura
Tsuyoshi Kumano
Hiroaki Yamane