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Typically, highly stressed gears  are heat treated to satisfy operational demands. Case hardening is a common heat treatment associated with power train components. In the heat treatment process complex distortion takes place, which has been studied in these examinations. Object of the actual investigations were spur wheels with small module. The case hardening was realized utilizing low pressure carburization with subsequent high pressure gas quenching in a heat treatment furnace of industrial proportion. The systematic analysis was guided using design of experiment methods. In strategic focus were the three contributing heat treatment steps heating, carburization and quenching. Heating related factors were the batch design and the preheating temperature. During carburization the temperature, carburization depth and surface carbon content were altered. Finally no quenching related variations were performed. The influences of the different parameters on the size and shape changes of the gear wheels were evaluated statistically. The identified main factors on size as well as on shape changes of the base body and the toothing will be presented and discussed.

Systematische Untersuchung verschiedener Einflussgrößen auf die Maß- und Formänderungen von einsatzgehärteten Stirnrädern: Teil 2: Verzahnungsverzug