Method and device for hardening bearing surfaces of crankshafts

US6638379B1 · kind B1 · utility

Assignee

• Elotherm GmbH · DE

Inventors

• Peter Schulte · Richmond, US
• Hans-Jürgen Leissner · Remscheid, DE
• Waldemar Gezarzick · Remscheid, DE

Key dates

• Filing date: Jun 6, 2002
• Grant date: Oct 28, 2003
• Expiry date: Jun 6, 2022

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P10/25
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

This invention relates to a procedure for hardening the bearing surfaces (H1,H2,H3,H4) of a shaft or axle, in particular a crankshaft (2) or camshaft, in which the bearing surfaces (H1-H4) to be hardened are hardened sequentially with the shaft or axle turning around their longitudinal axis (L) by means of a heating and quenching device (3), in which the distortion of the shaft or axle that arises in the area of the respective bearing surface (H1) during the course of hardening is determined, in which the shaft or axle is supported by at least one supporting device (9) during hardening of a bearing surface (H1-H6), which is placed against a previously hardened bearing surface (H1), and in which the setting of the supporting device (9) is regulated taking into account the distortion determined for the bearing surface (H1), against which the supporting device (9) is placed, and a device which enables hardening of crankshafts with a minimal distortion.