Thyssenkrupp Rothe Erde Gmbh

Rothe Erde Gmbh

Thyssen Krupp Ag

Thyssenkrupp Rothe Erde Germany Gmbh

Efd Induction Gmbh

Enrx Gmbh

Bernd Stakemeier

Marco Burtchen

Mathieu Langels

Jörg Rollmann

Joerg Rollmann

Gunther Elfert

Johannes Wozniak

Andreas Palmer

Wilfried Spintig

Kristian Berggren

Josef Bracht

Wiilfried Spintig

Johannes Dr-Ing Wozniak

Jörg Dr-Ing Rollmann

A rolling bearing may have at least two bearing rings arranged rotatably relative to each other, at least one row of rolling elements arranged such that they can roll between the bearing rings, and a position-determining device for determining an absolute angular position of the bearing rings relative to each other. The position-determining device includes field patterns that are arranged on a surface of a first of the bearing rings and distributed around a circumference thereof, with fields of the field patterns having field heights with discrete values. The position-determining device also includes at least one eddy current sensor that is provided on a second of the bearing rings to scan the field patterns. An evaluation device may be configured to assign an associated angular position signal, which describes the absolute angular position of the first and second bearing rings relative to each other, to a scan of each field pattern.

Rolling bearing having position-determining device

A method for induction surface hardening includes, when in a feed mode, moving an induction coil of a hardening device over a ring surface of a work piece in a treatment direction, to heat the ring surface from an initial zone to a final zone. A sprayer, located downstream of the induction coil in the direction of treatment, is activated to apply quenching liquid to the heated ring surface to both cool and harden the ring surface. An unhardened soft zone is provided between the initial zone and the final zone. A supplementary induction coil, the induction coil and the sprinkler are respectively activated and deactivated separately at the start and end of the hardening, while the relative feed speed between the hardening device and the work piece, and/or the power supplied to each of the supplementary induction coil and the induction coil, are varied at the same time.

Method for induction surface hardening of a ring surface

The invention relates to a method for the progressive induction surface hardening of a closed curve trace of a workpiece, the closed curve trace and a hardening device being moved relative to one another in a feed mode to harden the closed curve trace starting from an initial zone to an end zone, an unhardened soft zone being provided. According to the invention, the workpiece is provided with a marking, the hardening device having a sensor for detecting said marking. The curve trace and the hardening device are moved relative to one another along the treatment direction until the senor detects the marking. Once the marking is detected, another movement takes place in the treatment direction before the hardening device is activated, the curve trace being hardened by the relative movement. The marking is again detected by means of the sensor and the hardening device is then deactivated. The invention also relates to an arrangement which is suitable for carrying out the method described.

Method and arrangement for progressive surface hardening

The invention relates to a method for the induction surface hardening of a ring surface of a workpiece, the ring surface and a hardening device having an induction coil being moved relative to one another in a treatment direction in a feed mode. A sprinkler is located downstream of the induction coil when seen in the direction of treatment and serves to heat the ring surface, starting from an initial zone to a final zone, by means of the induction coil and then to harden it by cooling the ring surface by means of the sprinkler, an unhardened soft zone being provided between the initial zone and the end zone. According to the invention, the supplementary induction coil, the induction coil and the sprinkler are activated and deactivated separately from one another at the start of the hardening process and at the end of the hardening process, respectively, the speed between the hardening device and the workpiece and/or the power supplied to the supplementary induction coil and the induction coil being varied at the same time.

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 bearing ring for a large roller bearing is formed with at least one annular race which is hardened by heating by juxtaposing that race with an inductor across a spacing which is maintained during the heating and then quenching. The spacing is controlled selectively so that it is:

Method of making a bearing ring for a large roller bearing

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Erwitte, Germany

Bernd Stakemeier