INDUCTION UNIT FOR HEATING DISCS Russian patent published in 1995 - IPC

FIELD: metal pressure forming. SUBSTANCE: induction unit includes a rotary table in the form of heat-and electroinsulated rods and a removable sleeve, being driven to rotation by a drive assembly and mounted coaxially with possibility of rotation around a vertical axis and supporting the disc to be heated along its periphery and in its central portion respectively. The disc had been heated, the heating temperature is being lowered iron a temperature of maximum ductility of the material on a flange of the disc up to a temperature of plastic deformation on an annular portion of the disc, arranged on a necking radius of a die; cooling the central portion of the disc, restricted by the necking radius of the die; performing temperature lowering after heating from the flange towards the annular portion with a predetermined temperature gradient, directed along a radius of the disc towards its center and providing constant stress values along a cross section of the disc at process of plastic deformation. EFFECT: enhanced quality of heating of disc material. 7 cl, 7 dwg