| High speed milling technology has the advantages of high efficiency, low energy consumption and high quality, which has been developed rapidly in recent years. Due to lacking relatively complete database to choose from, its superiority can not be fully played. According to the characteristics of five-axis machine center during working, this article resolves milling speed into spindle speed, title angle and yaw angle, for ball end mill high speed finishing of RoyAlloy die steel, the effects of milling parameters on milling force and surface quality are investigated, the prediction equation of milling force and surface quality are established, which provide a basis for the rational use of milling parameters.Through the milling force test, to analyze the influence of milling parameters on the milling force. The prediction equation of the milling force is established, it is proved to be of good significance, which can be used to predict the milling force.The influence of milling parameters on surface roughness is analyzed by surface roughness test. The results show that the roughness is influenced by the parameters of the milling parameters from big to small in turn: milling width, yaw angle, title angle, milling depth, feed per tooth, spindle speed; the prediction equation of surface roughness is derived and verified.Based on surface hardening test, a better combination of milling parameters is obtained: spindle speed 20000r/min, feed per tooth 0.08mm/z, milling depth 0.20 mm, milling width 0.70 mm, title angle 30°, yaw angle 10°; the prediction equation of surface hardening is established and the accuracy of the equation is verified.The optimization model based on the optimal surface quality is established, according to the results obtained by non-dominated sorting genetic algorithmⅡ(NSGA-Ⅱ), such parameters are suggested: spindle speed 20000r/min, feed per tooth 0.14mm/z, milling depth 0.05 mm, milling width 0.25 mm, title angle 40°, yaw angle 40°. |
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