Process Optimization of CNC End Milling of Integral Impeller Channels

Abstract

The process optimization model was established in finish machining of the bottom surface of the integral impeller channels. The optimization objective was the maximal productivity, and three process parameters such as spindle speed, feed speed and cutter row space are chosen as design variables. Constrains were analyzed from three aspects: machine tool, cutter and machining quality in accordance with the actual 5-axis machining conditions. The genetic algorithm (GA) was employed to seek the optimum solution. A machining experiment was conducted to compare the efficiency of the optimum parameters with that of the empirical parameters. The results showed that the optimum solution reduced by 29.4% time in comparison with the empirical parameters, which represented that the process optimization was significant in improving the finish machining efficiency of impeller channels.