The basic principle and application of flywheel energy-storing technique of cold shear are introduced,its design idea and method stated.

The paper analyses the structure of 160 t cold shear,calculates in theory and applies in practice,excludes the more difficult ways for carrying out that the improving ability of 160t cold shear,then finds a useful way.

Design of protector of 400 t cold-shearing machine;

The working principle of CM250 cold-shearing mill in bars production line at Xingang is introduced.

Analysis on main body breakage of 8.5MN cold shear and the solution to repair;