According to the movement type, forging blank can be divided into free forging, upsetting, extrusion, forging, closed forging, closed upset forging.
1, free forging. Use impact or pressure makes the metal in fluctuation two against iron production occurred between spring.i shape to required forgings, basically have inter-linked manual forging and mechanical forging two kinds.
2, forging. Die forging were divided into open-die die forging and close-type metal blank in forging. Have a certain style of forging die within compression chamber variant and inter-linked forgings, can divide again for cold dui, roller forging, the radial forging and extrusion etc.