Title:
MANUFACTURE OF ROLLER FOR ROLLER BEARING
Document Type and Number:
Japanese Patent JP3648801
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To manufacture a roller for a roller bearing without forming any sharp edge at the joint part of the rolling contact surface and the chamfered part of a roller.
SOLUTION: When close-forging the roller for the roller bearing, by using split dies consisting of an upper die 1B for forming the rolling contact surface of the roller and a lower die 1A for forming a chamfered part R, a step difference 12 enlarged in the outside diameter of the rolling contact surface of the roller is formed at the position of the joint part 4 of the upper die 1B and the lower die 1A of the forged roller. Next, the outside diameter surface of the forded product is ground to remove the step difference 12, and then is barreled. Since grinding is performed so that the step difference 12 is removed, a sharp edge like a conventional method is not formed on the joint part 4.
Inventors:
Kamijo Osamu
Nobuo Suzuki
Eiichi Kawamura
Nobuo Suzuki
Eiichi Kawamura
Application Number:
JP23685095A
Publication Date:
May 18, 2005
Filing Date:
September 14, 1995
Export Citation:
Assignee:
Nippon Seiko Co., Ltd.
International Classes:
B21D39/00; B21J5/02; B21K1/02; (IPC1-7): B21K1/02; B21J5/02
Domestic Patent References:
| JP63278629A | ||||
| JP60244436A |
Attorney, Agent or Firm:
Tetsuya Mori
Yoshiaki Naito
Cui Shu Tetsu
Yoshiaki Naito
Cui Shu Tetsu
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