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.