Induction Preheating Steel Bar For Hot Forming With RF IGBT Induction Heater
Objective Preheating round steel bar stock prior to forging a hot formed u-bolt
Material .795” (20.19mm) diameter round steel bar stock 15” (381 mm) long
Temperature 1500 ºF (816 ºC)
Frequency 20 kHz
Equipment • DW-MF-90kW induction heating system, equipped with a remote workhead containing eight 1.0μF capacitors for a total of 2.0μF
• An induction heating coil designed and developed specifically for this application.
Process A fifteen turn helical coil with ceramic insert is used to preheat the 15” (381 mm) section of steel bar stock. Power is supplied for 9.90 seconds to heat the whole piece to 1500 ºF (816 ºC). The piece is then placed in a die and formed into a u-bolt.
Results/Benefits Induction heating provides:
• Uniform through heating
• High volume, rapid forging
• Scale formation reduced, steel does not remain above oxidation temperature for long periods of time
• Fast, energy-efficient heat