Method for the production of a bearing ring for large-size rolling bearings

US8091239B2 · kind B2 · utility

Assignees

• Rothe Erde GmbH · DE
• EFD Induction Private Limited · DE

Inventors

• Joerg Rollmann · Lippstadt, DE
• Wilfried Spintig · Lippstadt, DE
• Bernd Stakemeier · Erwitte, DE
• Kristian Berggren · Bürgel, DE

Key dates

• Filing date: Feb 11, 2006
• Grant date: Jan 10, 2012
• Expiry date: May 9, 2029

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T29/49707
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A method is provided for producing a bearing ring (1) for large-size rolling bearings including at least one track (3) that is provided with a hardened peripheral layer. With the method the peripheral layer that is to be hardened is exposed to the electric field of an inductor in order to be heated and is then quenched. At least two inductors (2) are disposed above a common zone (a) of the annular track (3) that is to be hardened at the beginning of the hardening process. These inductors (2) heat the opposite peripheral layer to a hardening temperature at this location. The inductors (2) are moved in the opposite direction along the annular track in order to heat the adjacent central zones (b). Sprinklers (5) that are directed onto the heated peripheral layers are turned on following a short distance, and the peripheral layers are quenched starting from the center of the zone (a) that was heated at the beginning. The inductors (2) and the sprinklers (5) continue to be moved on the halves of the rings thereof until coinciding again in a zone (c) located opposite the point of departure and once again forming a joint heating zone there. Both inductors (2) are lifted perpendicular to t…