BALL-AND-ROLLER BEARING FOR ROLLING MILL

Title:

BALL-AND-ROLLER BEARING FOR ROLLING MILL

Document Type and Number:

Japanese Patent JP3553434

Kind Code:

B2

Abstract:

PROBLEM TO BE SOLVED: To provide a ball-and-roller bearing for rolling mills which has more effective rust-preventing function while maintaining the performance for a conventional ball-and-roller bearing using carbonized and quenched steel and is useable over a long period of time as compared with this conventional type of ball-and-roller bearing.
SOLUTION: The material of at least outer races 2a, 2b, 2c among inner races 1a, 1b, outer races 2a, 2b, 2c and rolling elements 5 is made of martensitic stainless steel and hardened surface layers SH including at least raceway track surfaces are formed. By making the hardness of the hardened surface layers SH to ≥HRC 57 and the hardness in parts other than those layer to HRC 28-47, toughness equal to that of the this conventional type of bearing using the carburized steel is provided and, besides, peeling caused by season rust is drastically reduced.

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Inventors:

Kazuhiko Fujimoto
Kohei Takezawa

Application Number:

JP28508899A

Publication Date:

August 11, 2004

Filing Date:

October 06, 1999

Export Citation:

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Assignee:

Koyo Seiko Co., Ltd.
jfe Steel Corporation

International Classes:

B21B31/07; C22C38/00; C22C38/18; F16C19/38; F16C33/58; F16C33/62; (IPC1-7): B21B31/07; C22C38/00; C22C38/18; F16C19/38; F16C33/58; F16C33/62

Domestic Patent References:

JP11062946A
JP11061351A

Attorney, Agent or Firm:

河▲崎▼ 眞樹

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