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Investigation of Parameters Influencing the Hardening Distortion of Driving Bevel Gears

Abstract From an economic and ecological point of view, mastering the distortion behavior of gear components continues to represent a considerable potential for reducing reworking and scrap costs. In particular, the constraints arising in the course of electrification, for rapid implementation of drive solutions that are as CO2-neutral as possible, require leaner processes. Within the scope of this work, investigations were carried out to identify parameters influencing the hardening distortion of drive bevel gears. The primary goal was to identify influences and disturbance variables in a standard large series process that have to be either eliminated or controlled in order to ensure consistent delivery quality with the most constant lapping settings possible, especially during the final lapping process, in which crown wheel and drive bevel gear are „married“. This publication presents the experimental results of investigations on drive bevel gears from 41 melt batches under near-series case hardening with oil quenching as well as a heat treatment experiment with intermediate stress relief annealing and a third series of tests in which case hardening is carried out in a low-pressure carburizing plant with varied heating rate, temperature holding stages and high-pressure gas quenching.