1. Improve surface roughness.
2. Correct roundness and ellipticity ≤0.01mm.
3. Improve surface hardness, eliminate stress deformation, increase hardness HV≥4 °
4. There is a residual stress layer after processing to increase the fatigue strength by 30%.
5. Improve the quality of coordination, reduce wear and prolong the service life of parts, but the processing cost of parts is reduced.