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. According to the actual production accuracy of the chain, the sprocket tooth profile is optimized. When used in conjunction with Hengxin chain, the transmission is more stable and the noise is less. The use in conjunction 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%.