Study on laser cladding process and friction characteristics of friction pairs of copper-based powder metallurgy materials

Abstract

To address the problems such as abnormal wear and the friction layer falling off caused by insufficient adhesion stability of clutch friction pairs formed by traditional sintering and pressing, the laser cladding process manufacturing method was used to prepare the cladding layer of the copper-based powder metallurgy friction materials by using Laserline LDF 6000–100 semiconductor laser, and the prepared friction pairs were tested and analyzed by SEM in this paper. The numerical model of the friction torque of the wet clutch was established, and the friction performance and wear tests were carried out using MM-3000 performance test machine. The friction characteristics of the wet clutch prepared by the laser cladding process were investigated under typical operating conditions. The results show that the accuracy of the numerical model is verified by the experiments; The friction layer prepared by laser cladding technology has compact structure, without obvious crack defects, and has good wear resistance. Compared with the traditional sintering and pressing technology, the wear rate of the friction pairs is reduced by 59.76%; The maximum slipping friction work under different engagement pressures increases with the increase of rotating speed; The friction torque can rapidly reach the maximum value after the clutch is fully engaged, and the equivalent friction coefficient also reaches the extreme value correspondingly at this time.