Mechanical Surface Treatment in the Gear Production

Author:  Jürgen Hoffmeister, Jörg Hermes
Source:  ICSP-13
Doc ID:  2017080
Year of Publication:  2017
Introduction: The power density of industrial gear boxes increases continuously, so it is necessary to improve the performance of the gear wheels. Beside modified materials and adapted heat treatments mechanical surface treatments are a good possibility to increase the strength of gear wheels. For gears two failure methods must be differentiated [1, 2]: damage of the tooth flank and fracture of the tooth root. For the tooth flank different mechanical surface treatments e.g. shot peening or slide grinding can improve the strength. For the tooth root shot peening is the most common process to increase the performance. [2] explains the increase of tooth root strength to the compressive residual stresses. This benefit can be used in the calculation of tooth bending strength of gear wheels. Because of the great number of load cycles which a gear can see during his life cycle, the high cycle fatigue phoneme must not be neglected during the process optimization [3].

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