Electrical Upsetting Machine

a machine designed to produce bosses on bar stock, contoured workpieces, and tubing by upsetting. The portion of a workpiece to be upset is induction heated as it moves through a furnace; heating in continuous resistance furnaces or by electric contact may also be used. Electrical upsetting machines can produce bosses on the ends of workpieces or staggered along the length. Because the movement of the workpiece into the heating zone is gradual, the length of the boss produced can be made considerably greater than is possible in upsetting on horizontal forging machines. Electrical upsetting machines are used in the production of valves, tubes with flanges and corrugations, stepped shafts, sections with flared ends, and other parts made from steels and alloys of titanium, aluminum, and sometimes copper and nickel. They are also used to produce workpieces of variable cross section for subsequent forging.