Response Surface Optimization Design of G20CrMo Composite Surface Cylinder Texture Parameters and Analysis of Tribological Performance

Seventeen sets of gradient-sized cylindrical textures were designed and machined on G20CrMo surface, then filled SnAgCu to form a composite surface. Reciprocating friction tests were conducted under conditions of 10 N, 1 Hz and 8 mm, and data were extracted for response surface analysis, yielding optimal parameters of R = 483 μm, W = 206 μm and H = 48 μm. Further experimental analysis revealed that compared to the base material, the composite surface with optimal parameters exhibited reductions of 23.5% in coefficient of friction, 44% in wear loss, 75% in friction noise, and 66.7% in amplitude. Additionally, the average diameter of wear scars on grinding balls was decreased by 34.6%. The composite surface with optimal parameters effectively improved the tribological performance of G20CrMo base material and demonstrated notable self-lubricating and self-repairing capabilities.