Annealing the end of a hydraulic motor shaft prior to machining

Objective

Annealing the end of a steel hydraulic motor shaft prior to machining 

End Product

motor shaft

Equipment

• Ambrell 4.2 kW induction heating system, equipped with a remote workhead containing one 1.0 µF capacitor

• An induction heating coil designed and developed specifically for this application. 

Materials

0.75” (19mm) diameter steel rod, 6” (152.4mm) long with a keyway at the end 

Temperature

1350 ºF (732 ºC)

Frequency

259 kHz

Testing

A three-turn helical coil is used for annealing the motor shaft. The end of the motor shaft is placed in the coil and power is applied for 20 seconds to reach 1350 ºF (732 ºC) and turns the steel red hot 

Benefits

Induction heating provides:

• High efficiency, low energy cost

• Precise and controllable placement of heat to anneal only the required area

• Faster production process

• Consistent results 

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