Title:
PROCESS FOR MANUFACTURING ROLLING MEMBER, PROCESS FOR MANUFACTURING ROLLING BEARING, RACEWAY MEMBER OF ROLLING BEARING AND ROLLING BEARING
Document Type and Number:
WIPO Patent Application WO/2007/138903
Kind Code:
A1
Abstract:
A process for manufacturing a rolling member that while simultaneously avoiding the
problem attributed to generation of decarburized layer and the problem attributed to
scale generation, attains reduction of manufacturing cost. The process comprises
the steel-made member preparation step of preparing a steel-made member consisting
of a steel containing 0.7 mass% or more of carbon; the hot forging step of performing
hot forging of the steel-made member prepared in the steel-made member preparation
step to thereby obtain a blank ring as the first forged member; the first lathe
turning step of performing lathe turning of the blank ring obtained in the hot
forging step to thereby remove part of the blank ring; and the cold forging step
of performing cold forging of the blank ring wrought in the first lathe turning step
to thereby obtain a stepped ring. In the steps subsequent to the cold forging step,
on the stepped ring, the area wrought in the first lathe turning step is not subjected
to cutting operation.
Inventors:
MAEDA, Kikuo (3066 Aza Oyumida, Oaza Higashikata, Kuwana-sh, Mie 11, 5110811, JP)
前田 喜久男 (〒11 三重県桑名市大字東方字尾弓田３０６６番地 ＮＴＮ株式会社内 Mie, 5110811, JP)
前田 喜久男 (〒11 三重県桑名市大字東方字尾弓田３０６６番地 ＮＴＮ株式会社内 Mie, 5110811, JP)
Application Number:
JP2007/060333
Publication Date:
December 06, 2007
Filing Date:
May 21, 2007
Export Citation:
Assignee:
NTN CORPORATION (3-17, Kyomachibori 1-chome Nishi-ku, Osaka-sh, Osaka 03, 5500003, JP)
ＮＴＮ株式会社 (〒03 大阪府大阪市西区京町堀１丁目３番１７号 Osaka, 5500003, JP)
MAEDA, Kikuo (3066 Aza Oyumida, Oaza Higashikata, Kuwana-sh, Mie 11, 5110811, JP)
ＮＴＮ株式会社 (〒03 大阪府大阪市西区京町堀１丁目３番１７号 Osaka, 5500003, JP)
MAEDA, Kikuo (3066 Aza Oyumida, Oaza Higashikata, Kuwana-sh, Mie 11, 5110811, JP)
International Classes:
F16C33/64; B21K1/04; B23P13/00; F16C33/58; B21K1/00; B23P13/00
Attorney, Agent or Firm:
FUKAMI, Hisao et al. (Fukami Patent Office, Nakanoshima Central Tower 22nd Floor,2-7, Nakanoshima 2-chome,Kita-ku, Osaka-sh, Osaka 05, 5300005, JP)