The heat flow coupling effect of laser-assisted magnetorheological polishing

Abstract

During the magnetorheological polishing process of concave workpieces, the magnetorheological fluid tends to accumulate at the entrance of the polishing zone, resulting in a decrease in the polishing efficiency and quality. To solve this problem, in this paper, laser-assisted magnetorheological polishing technology was proposed. Based on the theory of fluid mechanics and heat transfer, a three-dimensional temperature field distribution model of the spherical polishing film was established to achieve local temperature control at the entrance of the polishing zone. Then, the functional relationship between the viscosity of the magnetorheological fluid and the temperature was obtained experimentally. On this basis, the shear force and hydrodynamic pressure models of the polishing zone were established, which reveal that the heat flow coupling effect can increase temperature at the inlet of the polishing zone and reduce the viscosity of the local magnetorheological fluid, thereby reducing the shear stress in the polishing zone. The results show that when the laser power is 3 W and the magnetorheological fluid flow rate is 6 ml/s, the viscosity of the magnetorheological fluid at the entrance can be effectively reduced, and the shear force in the polishing zone decreases slightly.