Shrink Fit Steel Gear onto Shaft With High Frequency Induction Heating Units
Objective Heat the bore of a hardened spur steel gear to shrink fit onto aย gear motor shaft. This is part of a chair for the disabled.
Material Steel gear 2.5โ (63.5mm) OD, .75โ (19mm) ID x .625โ (16mm)ย thick, temperature indicating paint
Temperature 400 ยบF (204 ยบC)
Frequency 300 kHz
Equipment โข DW-UHF-3.2 kW induction heating system, equipped with aย remote workhead containing two 0.66 ฮผF capacitors for aย total of 1.32 ฮผF
โข An induction heating coil designed and developedย specifically for this application.
Process A four turn helical internal coil is used to heat the gear bore.
The coil is inserted into the gear bore and power is applied forย 90 seconds to reach the required 400 ยบF (204 ยบC) and expand
the gear bore. The gear is then placed on the shaft andย allowed to cool, creating the shrink fit between the gear and
the shaft.
Results/Benefits Induction heating provides:
โข No pre-heat cycle, heat is available on demand
โข Energy efficient, heats only the part, not the atmosphereย around it
โข Controlled, even distribution of heating
โข Faster production times
