Induction Case Hardening Shaft
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Case hardening shafts
Objective Harden 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 •Power of 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
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