... help of punch press, forging machine or other equipments, for instances, hot extrusion of watch case, watch flan, handle, mold ... through the heating based on the principle of hot expansion or hot smelting, for instances, embedded welding of copper core of ... shear (orchard shear).2.Quench for various automobile and motorcycle fittings, such as crankshaft, connecting rod, piston pin, chain wheel, ...