The flexible type of heater is the induction heater. Operating in 'lot size 1' mode, it allows the operator to set any desired temperature profile – the so-called "taper" – over the length of the billet for an isothermal extrusion process. As the induction heater heats every billet individually, billet-to-billet temperature or length variations (in conjunction with a cold saw) can be implemented without impairing the particularly close temperature tolerance
Induction heating is used in many industrial processes, such as heat treatment in metallurgy, Czochralski crystal growth and zone refining used in the semiconductor industry, and to melt refractory metals that require very high temperatures. It is also used in induction cooktops.
Working Principle
Induction heater units incorporate high frequency generators for non-contact heating of metal using electromagnetic induction. When AC is applied to a coil surrounding the work (metal), a magnetic field is generated by the current flowing in the coil, and induced loss (hysteresis loss) is generated causing a heat.
Specifications
- Applications: Boosting temperature for rolling
- Billet size: SQ 65 - SQ 250 mm
- Temperature rise: 100 - 400 °C
- Power rating: 500 kW and above
- Heating: Progressive / Oscillating