Note: Shrink Fitting Cam Shaft Gears
Objective:
To heat aluminum and steel camshaft gears to over 500°F within 4 minutes for a shrink fitting application.
End Product:
camshaft gears
Equipment:
Ambrell 5 kW power supply, remote heat station with one 0.66 μF capacitor and a specially designed induction coil.
Materials:
6” diameter, 2” thick steel and aluminum camshaft gears, “K” type thermocouple, digital thermometer
Temperature:
518° F for the steel gear; 320°F for the aluminum gear
Frequency:
151 kHz for the steel gear; 158 kHz for the aluminum gear
Testing:
Best results were achieved with the 3.5 kW power supply. Heating times of 3 minutes for the steel gear and 4 minutes for the aluminum gear resulted in uniform expansion of the gears for effective shrink fitting. The shafts dropped easily into the gears after the heat cycle.
Benefits:
The shafts were gripped tightly after 30 seconds, resulting in total heat cycle times of 3.5 minutes for steel and 4.5 minutes for aluminum.
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