In the manufacturing departments with large batch production such as die forging, roll forging, rolled parts cold warm extrusion parts, bar material is the main raw material in the production, the bar shearing machine is the main equipment for preparing blank for these forging processes. The bar shearing machine is a kind of cutting blanking equipment with high production efficiency. Generally, the diameter of the bar can be sheared φ 20 mm to φ 200 mm, for large diameter, the diameter of the bar can be cut For example, the ratio of working hours between sawing shearing is about 1:20, the material utilization rate of cutting can be increased by 15% ~ 20%. It is easy to realize mechanization automation for carbon steel low alloy steel in cold hot state Compared with other cutting processes, the bar shearing process has obvious economic effect.