Title:
HEAT TREATMENT METHOD OF RING-SHAPED MEMBER, PRODUCTION METHOD OF RING-SHAPED MEMBER, BEARING RING OF ROLLING BEARING AND ROLLING BEARING
Document Type and Number:
Japanese Patent JP2017210631
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a heat treatment method for a ring-shaped member capable of forming a ring-shaped hardened region homogeneous in the circumferential direction while suppressing the production cost of a hardening apparatus, and capable of suppressing decarbonization and hardening crack on a surface, and a production method of a ring-shaped member.SOLUTION: A heat treatment method of a ring-shaped member includes a step of forming a ring-shaped heating region heated to a temperature equal to or higher than an Apoint to a compact 10 by relatively rotating a coil 21 that is arranged so as to face a rolling face 11 of a ring-shaped compact 10 made of steel and heats by induction the compact 10 along a circumferential direction of the compact 10, and a step of simultaneously cooling an entire heating region to a temperature equal to or lower than a M. In the step of heating the heating region, the compact is heated such that a maximum arrival temperature of a surface temperature of the compact is 1000°C or lower.SELECTED DRAWING: Figure 2
Inventors:
YUKI KEIJI
OKI TSUTOMU
OKI TSUTOMU
Application Number:
JP2016102348A
Publication Date:
November 30, 2017
Filing Date:
May 23, 2016
Export Citation:
Assignee:
NTN TOYO BEARING CO LTD
International Classes:
C21D9/40; C21D1/10; F16C33/64
Attorney, Agent or Firm:
Fukami patent office