The design principle of Pneumatic machine is to convert the circular motion into linear motion, by the force of the main motor, drive the flywheel, drive the clutch gear, crankshaft (or eccentric gear), connecting rod operation, to achieve the linear motion of the slider, the motion from the main motor to the connecting rod is circular motion. Between the connecting rod and the slider, there need to be a connection point of circular motion and linear motion. There are roughly two kinds of mechanisms in the design, one for the ball type and the other for the pin type (cylindrical type). The circular motion is converted into the linear motion of the slider by this mechanism. Pneumatic punching machine exerts pressure on the material, so that its plastic deformation, and obtain the required shape and accuracy, so it must be matched with a group of molds (divided into upper and lower die), the material placed in the middle of the machine to exert pressure, deformation, processing force caused by the force on the material, Absorbed by the punch machine body.