Imported CNC lathe is used to complete the inner hole with one clamping to achieve the accuracy of precision gears. 45# high-quality carbon structural steel, forged and formed, the material streamline is complete, and the sprocket life is increased by 15% compared with machining. The sprocket tooth profile optimization design is carried out in combination with the actual production accuracy of the chain. The combination of the chain and the chain can make the transmission more stable and the noise less. The combination can improve the service life of the chain sprocket by 50%. High-precision hobbing machine for hobbing processing, accurate pitch, consistent tooth profile, small runout, accurate meshing, not easy to jump chain. The use of CNC double-station quenching machine, hardening layer uniform, no soft point, to avoid local transition wear. The ternary sub-surface strengthening treatment technology is used to eliminate the stress in the processing process and generate compressive stress on the surface, which improves the wear resistance by 20%.