According to the movement of blank, forging can be divided into free forging, upsetting and extrusion, die forging, closed die forging, closed upset.
1, free forging. Use impact or pressure to make metal on the up and down two to produce deformation between iron (anvil block) to obtain the required forgings, there are mainly manual forging and mechanical forging two kinds.
2, die forging. Die forging and divided into open die forging and closed die forging. Metal blank in a certain shape in the bore of the forging die forging compression deformation, can divide again for cold heading, roll forging, the radial forging, extrusion and so on.
3, closed die forging and closed upset because there is no flash, material utilization ratio is high. With a process or a few process can complete complex forging finishing. Since there is no flash, forging stress area is reduced, the required load is also reduced. However, we should pay attention to not make blank completely is restricted, so we will strictly control the volume, control the relative position of forging die and measure of forgings, effort to reduce the wear and tear of forging die
