Induction Surface Hardening Shaft for Armature Shaft

Induction Surface Hardening for Armature Shaft

Objective Induction Surface Hardening the gear end of an armature shaft to 58-65 Rockwell C at a depth of 0.02"(.51mm) on the center line of the teeth and to 49-55 Rockwell C at a depth of .010" (.3mm) on the center line of the root. Material: Steel armature shaft measuring 7" (177.8mm) in length with a gear diameter of approximately 1/2 (12.7mm). Temperature: 1700ºF(926.7ºC) Frequency: 140 kHz Equipment • DW-UHF-30kW induction heating system equipped with a remote workhead containing two (2) capacitors totaling 0.5 µF • 4-20 mA input simulator • An induction heating coil designed and developed specifically for this application. Process A five turn helical coil is used to heat the gear end of the shaft to 1700ºF (926.7ºC) for 2.5 seconds to achieve the desired hardness. Results/Benefits Induction Heating Provides: • Pin-point accuracy • Maximum repeatability • Faster cycle time