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Patent Searching and Data


Title:
METHOD FOR MANUFACTURING ROLLING DEVICE
Document Type and Number:
Japanese Patent JP2002327213
Kind Code:
A
Abstract:

To provide a method for manufacturing an eco-friendly rolling device without heat treatment for carburizing and carbonitriding, while improving the life and abrasion resistance of bearings.

A method for manufacturing a rolling part comprises quenching the part made from an alloy steel which includes 0.7-1.1 wt.% C, 0.1-0.5 wt.% Si, 0.2-0.8 wt.% Mn, 0.9-2.0 wt.% Cr, and the balance Fe with unavoidable impurities, then subjecting it to a chilling treatment of holding at a cold temperature of -47°C or lower for one or more hours, and tempering it. The method for manufacturing a rolling bearing includes employing the rolling part, on the surface of which carbides with a mean particle diameter of 0.4 μm or less out of all existing carbides have an area rate of 32% or more, and carbides with a mean particle diameter of 1 μm or more have an area rate of 2% or less, and in the whole volume of which the amount of the retained austenite has a volume factor of 0-0.2%.


Inventors:
HORI KEIZO
Application Number:
JP2001131343A
Publication Date:
November 15, 2002
Filing Date:
April 27, 2001
Export Citation:
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Assignee:
NSK LTD
International Classes:
F16C33/32; C21D1/18; C21D9/40; C22C38/00; C22C38/18; F16C33/34; F16C33/62; F16C33/64; (IPC1-7): C21D9/40; C21D1/18; F16C33/32; F16C33/34; F16C33/62; F16C33/64
Attorney, Agent or Firm:
Tetsuya Mori (2 others)