Cutting Process Of Pneumatic Cutter

The cutting process of the pneumatic cutter is to use the gunpowder in the power bomb to burn at high speed to generate high-pressure gas, which pushes the movable knife piston group, so that the movable knife and the fixed knife form a scissors-type shear. The entire cutting process is milliseconds, which is an instantaneous impact. , The impact force is as high as 100KN, and the material to be sheared varies greatly. Therefore, the requirements for the movable and fixed knife materials are extremely high, and the selection of materials also requires comprehensive consideration.

During the trial production of pneumatic cutting pliers, Cr12MnV steel and 6CrNiSiMnMoV (commonly known as GD steel) were used successively as moving and fixed knives, but the service life of the moving knives was within 50 times, and the main failure mode was bending or breaking of the moving knives. After several explorations and experiments, 7Cr7Mo2V2Si (commonly known as LD steel) was finally selected.