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US 5,672,217 AGranted
Method for producing machine elements of steel
AssigneeSKF GmbH
InventorsFrank Hengerer, Johann Volkmuth
Life of this patent
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Abstract
In a method for producing machine elements of steel having a carbon content of 0.3 to 1.1%, blanks are heated to austenitizing temperature and austenitized, quenched for the formation of martensite, heated from room temperature to a maximum tempering temperature, and immediately after reaching said maximum temperature cooled to room temperature to attain a hardness of 45 to 65 RHC and finish-machined to machine elements.
Claims8
A method for producing rolling bearing rings of martensitically hardened rings of rolling bearing steel 100 Cr 6 comprising:
- (a) heating said rings from room temperature to a tempering peak temperature exceeding up to about 100.degree. K. the tempering temperature of about 230.degree. C. conventionally used for said 100 Cr 6 steel, each said ring being steadily upheated in said heating step during a time satisfying the ratio (t/d) of between about 50 and 210, wherein t is the heating time in seconds and d is the wall thickness of the rings in millimeters, and then,
- (b) cooling the rings immediately after reaching said peak temperature to room temperature to attain a hardness of 45 to 65 HRC in said rings.
Dependencies are inferred from the claim text.