Induction hardening belt retraction gear

Objective Heat the teeth of a soft steel seatbelt retraction gear to 1700°F (926.7ºC) within two seconds for hardening.
Material #4130 steel seatbelt retraction gears, water vortex quenching tank, electronically controlled air valves, adjustable timers
Temperature 1700 °F(926.7ºC)
Frequency 165 kHz
Equipment • Power of 25kW induction heating system equipped with a remote workhead with 1.0 μF capacitance
• An induction heating coil designed and developed specifically for this application.
Process A four-turn helical concentrating coil is specially designed to deliver uniform heat to the steel seatbelt retraction gear. The parts are positioned in the coil above the quenching tank and held in place with a vacuum rosette fixture. Power is applied for two seconds to heat the part. The parts are then expelled
into the quench tank for cooling.
Results/Benefits Induction heating provides:
• Uniform and repeatable results
• Energy efficient
• Non-contact heating