Abstract
The safety of heavy equipment is directly determined by the quality of heavy-duty sprocket, which is a basic component in transmitting motion and power. However, local overheat of tooth surface, non-homogeneous hardness and microcracking are observed due to the skin effect, corner effect, and annular effect during traditional induction hardening of sprockets with conventional circular coils. Finite-element numerical computation and comparative analysis were carried out for sprocket heating processes between circular coil and profile coil, respectively. The maximum temperature difference of the sprocket along the tooth profile and the heating time required to meet heat treatment expectation were introduced to evaluate heating quality and efficiency. By analyzing and comparing the effects of various electromagnetic and geometric parameters on the evaluation indicators, it is found that the heat transfer process during sprocket induction heating can be changed by suitable profile coil parameters, consequently, the performance of gear type products can be improved.
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