1. Improve the surface roughness, the roughness can basically reach Ra≤0.08μm.
2. Correct roundness, ellipticity can be ≤0.01mm.
3. Improve surface hardness, eliminate stress deformation, increase hardness HV≥4 °
4. After processing, there is a residual stress layer, which can increase the fatigue strength by 30%.
5. Improve the quality of fit, reduce wear and prolong the service life of parts, but the processing cost of parts is reduced
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