Thyssen Krupp Ag

Rothe Erde Gmbh

Efd Induction Gmbh

Wilfried Spintig

Jörg Rollmann

Joerg Rollmann

Johannes Wozniak

Bernd Stakemeier

Kristian Berggren

A method is provided for producing a bearing ring () for large-size rolling bearings including at least one track () 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 () are disposed above a common zone (a) of the annular track () that is to be hardened at the beginning of the hardening process. These inductors () heat the opposite peripheral layer to a hardening temperature at this location. The inductors () are moved in the opposite direction along the annular track in order to heat the adjacent central zones (b). Sprinklers () 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 () and the sprinklers () 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 () are lifted perpendicular to the surface of the track () upon reaching the required hardening temperature. The sprinklers () are directed onto zone (c).

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

A road wheel for a track laying vehicle is made by initially roll pressing and projection drawing a planar disk of temperable steel into a blank having a cylindrical portion, a planar hub portion and an intermediate portion bridging the hub and peripheral projection. Prior to machining at least of the intermediate portions, the blank is tempered and thereby increased in size. The blank is reshaped following the tempering and prior to machining to the original blank shape and is then machined.

Method of producing a road wheel for a track vehicle

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Lippstadt, Germany

Wilfried Spintig