This chapter discusses the induction heating of hollow cylinder from inside. This topic has been included because of its possible practical importance in the preheating of the 'containers' of extrusion presses. These very thick hollow cylinders have to be brought to starting temperature before work commences or kept at temperature during breaks; at present, this is done very ineffectively using surface heaters on the external surface of the cylinder, so that the heat has to find its way through the thick metal. This could be done much more efficient ly, using an induction coil temporarily suspended from the ram to heat the active surface, where it is needed.

Inspec keywords: magnetic fields; coils; induction heating

Other keywords: surface heaters; induction coil; induction heating; hollow cylinder; extrusion presses

Subjects: Process heating