Optimization Research On Influence Factors Of Surface Quality Of NC Machining Of Integral Impeller

The integral impeller is an important component that is widely used in various fields like aviation,energy power and petrochemical industries.While using the integral impeller,the quality of the machining surface often directly affects its performance,and the important influence on the quality of machining surface is the selection of cutting parameters.At present,the selection of the integral impeller cutting parameters is mainly adjusted by the workers according to their own machining experience through the rate knob.Each worker has different selection of cutting parameters,which makes the optimization of the machining surface and the maximum machining efficiency impossible.Therefore,how to scientifically and effectively select the cutting parameters is of great significance for the integral impeller to complete high quality and efficient manufacturing activities.In order to make the integral impeller machining can be completed with high quality and efficiency,this paper takes the radial-flow open integral impeller with the chassis as the research object,by analyzing the influence of cutting parameters on the surface roughness and residual stress of the integral impeller,the influence of cutting parameters on the surface roughness and residual stress of the integral impeller is summarized in the machining process of the integral impeller,and then the cutting parameters are optimized.The optimal combination of cutting parameters is used to guide the actual machining of the integral impeller and does the following research on its high quality and efficient processing techniques:(1)By analyzing the structural characteristics and machining difficulties of the radial-flow open integral impeller with the chassis,combining with the machining characteristics of the four-axis CNC milling machine,this paper makes a rational plan on the NC machining process of the radial-flow open integral impeller with the chassis.(2)Based on the orthogonal test of the integral impeller cutting parameters,the single impeller blade is numerically machined,and the surface roughness of each set of impeller blade is measured.The empirical formula of surface roughness is obtained by fitting through calculation.(3)Based on the finite element technique,the finite element simplified model of the blade milling process is established.According to the designed milling process of impeller blade under various cutting parameters of orthogonal test simulation,the residual stress of the machining surface is obtained.Finally,The empirical formula of residual stress of surface roughness is obtained by fitting through calculation.(4)Based on the optimization theory,the minimum residual stress and the maximum material removal rate are taken as the optimization targets.The multi-target genetic algorithm is used to optimize the cutting parameters,and finally the combination of cutting parameters that can achieve high quality and high efficiency machining is obtained.