In order to reduce wear and design high-performance spline coupling, the friction coefficient, wear coefficient, and wear depth of 14\ngroups of material specimens were tested using multifunctional friction and wear tester. The effect of materials, loads, rotation\nspeed, and surface treatment on friction coefficient, wear coefficient, and wear depth was investigated. A method using an\nArchard�s equation based on the finite element method to calculate the wear depth of 14 groups of material specimens was\nproposed, and the results were consistent with the experimental results. Then, the wear of a floating involute spline coupling of\naero-engine was predicted using this method. It can be concluded that carburizing and silvering can decrease the friction\ncoefficient. The wear and wear coefficient decreased after carburizing. So, it is necessary to take 18CrNi4A with carburization\nand 32Cr3MoVA with nitridation as the material of the spline coupling in aero-engine to minimize wear. Furthermore, the\nmethod presented to predicate the wear of spline coupling in this work provided a good fundament for the fatigue prediction\nmethodology of spline coupling.
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