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Title:
MANUFACTURING METHOD OF RACE FOR THRUST NEEDLE BEARING
Document Type and Number:
Japanese Patent JP2013164093
Kind Code:
A
Abstract:

To provide a manufacturing method of a race for a thrust needle bearing which is excellent in processing performance, favorable in an yield of a material, and can be manufactured at low cost.

A manufacturing method of a race for a needle bearing comprises: a cutting process for cutting a wire rod or a round rod material of medium carbon steel to a prescribed length, and manufacturing a raw material; a forging process for forging the raw material and forming a flat-shaped first middle raw material; a grinding process for applying grinding processing to the surface of the first middle raw material and finishing it to a second middle raw material having a prescribed shape and surface roughness; a shearing process for press-processing the second middle raw material, thirling its center, and separating it to a ring-shaped third middle raw material and a thirled material 25; a burring process for erecting a flange at the internal peripheral edge side or the external peripheral edge side of the third middle raw material, and forming it to a fourth middle raw material having a prescribed shape; and a heat treatment process for applying hardening treatment such as carbonitriding, quenching and tempering to the fourth middle raw material, and finishing it as the race.


Inventors:
YAMAMOTO KOICHI
TAKEMURA HIROMICHI
Application Number:
JP2012026393A
Publication Date:
August 22, 2013
Filing Date:
February 09, 2012
Export Citation:
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Assignee:
NSK LTD
International Classes:
F16C33/64; B21D19/08; B21D53/10; B21J5/08; B21K1/04; C21D1/06; C21D9/40; C22C38/00; C22C38/22; C23C8/32; F16C19/30; F16C33/62
Domestic Patent References:
JP2011174506A2011-09-08
JP2008082434A2008-04-10
JP2007170447A2007-07-05
JP2009250371A2009-10-29
JP2002180203A2002-06-26