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Coil Failures pt. 8: Gap by Gap Gear Hardening

July 12th, 2010

Gears are induction hardened by either encircling the part with a coil (so-called spin hardening) or, for larger gears, hardening them “tooth-by-tooth” or “gap-by-gap.” Article concentrates on analyzing main coil failure modes of “gap-by-gap” inductors for hardening large and medium size gears. Several case studies are discussed including degradation of laminations, copper overheating, distortion, arcing, coil abuse and improper handling.

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