Blanking-forging (improving the direction of metal fibers and eliminating the segregation of materials)-normalizing (eliminating the internal stress of workpieces)-rough turning (the average side allowance of each part is 1- 1.5mm). )-Quenching and tempering (to obtain the comprehensive mechanical properties of the workpiece, quenching and tempering is generally 28-30 HRC)-Grinding allowance of finish turning (the allowance of each part is 0.2-0.25mm on one side)-Fitter cuts the milling line-Milling the snake tail and related holes to the requirements-Pre-drilling the wire-cut holes-cutting the square holes to the requirements-High-frequency quenching-Grinding all parts to the requirements.