Minimal distortion induction hardening of crankshafts

During induction hardening of crankshafts, undesirable distortion occurs in the component, in particular in case of fillet hardening. The procedure patented by SMS Elotherm solves this problem by means of a combination of distortion simulation, an appropriate hardening sequence, specific power control, and a special mechanical workpiece handling system. This paper sets out the principles and the current techniques for minimal distortion induction hardening.