Method for hardening camshafts and linear inductor for the implementation of said method

US6259076A · kind A · utility

Assignee

• Elotherm GmbH · DE

Inventors

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

Key dates

• Filing date: Sep 29, 1999
• Grant date: Jul 10, 2001
• Expiry date: Sep 29, 2019

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T29/49293
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A method for simultaneously hardening a group of cams on a camshaft comprises first heating the group of cams at low power for at least one heating interval, then pausing the heating for a pause interval during which no power is applied to the group of cams, and then subsequently heating the group of cams at high power for one heating interval. The pause intervals, during which no power is applied to the group of cams, are sufficient as to allow heat stored in the cams to distribute uniformly throughout the cams. Each group of cams is hardened by a linear inductor and the regions of the camshafts that are not to be hardened are shielded by a cooling device.