MULTIPLE ROWS OF ROLLING BEARINGS FOR SUPPORTING ROLLS OF ROLLING MILL EQUIPMENT

Title:

MULTIPLE ROWS OF ROLLING BEARINGS FOR SUPPORTING ROLLS OF ROLLING MILL EQUIPMENT

Document Type and Number:

Japanese Patent JP3806261

Kind Code:

B2

Abstract:

PROBLEM TO BE SOLVED: To provide multiple rows of rolling bearings for supporting rolls of a rolling mill equipment whose manufacturing cost is low and maintenance cycle is long.
SOLUTION: The bearing ring and rolling element of 4-row rolling bearings 4 and 5 built in bearing boxes 6 and 7 to support neck portions 2a and 3a of work roll 2 and backup roll 3 is made of steel containing, as alloy elements, 0.2-0.3 mass % C, 2.5-3.0 mass % Ni, 1.0 mass % or less Cr, and 0.2-0.3 mass % Mo, and a carburized layer is formed on the surface to make the surface hordness to be HRC58 or more in Rockwell hardness. This makes it possible to reduce the material cost and heat treatment cost in comparison with the multiple-row rolling bearings using the conventional material for bearing, improve rolling fatigue characteristic and wear resistance and surface damage resistance, and extend the maintenance cycle, thus contributing to extension of the roll changing cycle of the rolling mill equipment.

Inventors:

Kikuo Maeda
Katsunori Ito
Nasu Shinobu

Application Number:

JP5150999A

Publication Date:

August 09, 2006

Filing Date:

February 26, 1999

Export Citation:

Click for automatic bibliography generation Help

Assignee:

ntn corporation

International Classes:

B21B31/07; C22C38/00; C22C38/40; F16C19/38; F16C33/34; F16C33/62; (IPC1-7): B21B31/07; C22C38/00; C22C38/40; F16C19/38; F16C33/34; F16C33/62

Domestic Patent References:

JP10140287A
JP2073950A
JP1168848A
JP1098711A
JP5239550A
JP10184700A

Attorney, Agent or Firm:

Bunji Kamada
Higashio Masahiro
Torii Kazuhisa

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