关键词: 直纹面侧铣加工, 精度可靠度, 代理模型, 高斯随机过程

Abstract: Aiming at the problems of low efficiency of accuracy reliability calculation and difficulty of reliability prediction caused by dynamic uncertainties in side milling of the ruled surface,a method of precision reliability analysis based on Gauss Process(GP)model of processing contact points was proposed.Considering the driving errors of machine tools and the uncertainty of tool parameters,the transformation values of contact coordinates were characterized with Gauss stochastic process,and an accuracy reliability model was established based on the topological structure of LU400 BC-axis machine tool.By decomposing the contact stochastic process with K-L transform,the GP agent model of accuracy reliability was obtained.The calculation model was updated iteratively with the model accuracy index,and the reliability value was obtained by Monte Carlo method based on the agent model.The results showed that the method had high efficiency and accuracy,and provided an effective method for predicting the reliability of the processing accuracy of the side milling of ruled surface.

Key words: side milling of ruled surface, precision reliability, agent model, Gaussian random process