Optimization of milling parameters considering surface quality and hardness of screw rotor

In order to improve the machining quality of multi-head screw rotors, this paper explores the influence of outer envelope milling parameters on surface roughness and hardness was investigated, and the parameters were optimized. Orthogonal tests were carried out with spindle speed, intermittent feed rate and machining rate as factors. The results show that machining rate is the most important factor affecting surface roughness value, and intermittent feed is the most important factor affecting microhardness value. The multi-objective optimization algorithm was used to optimize the process parameters, and the optimal combination of process parameters was obtained as follows: the spindle speed was 191 r/min, the intermittent feed rate was 3.1 mm, and the machining rate was 15%. The surface roughness value can be reduced by 17.15% and the microhardness value can be increased by 7.60%. The method presented in this paper can provide reference for the optimization of process parameters.