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The purpose of this paper is to propose a general precision allocation method to improvemachining performance of CNC machine tools based on certain design requirements. Acomprehensive error model of machine tools is established by using the differential motionrelation of coordinate frames. Based on the comprehensive error model, a reliability modelis established by updating the primary reliability with an advanced importance samplingmethod, which is used to predict the machining accuracy reliability of machine tools. Besides, to identify and optimize geometric error parameters which have a great influence on machining accuracy reliability of machine tools, the sensitivity analysis of machining accuracy is carried out by improved first-order second-moment method. Taking a large CNC gantry guide rail grinder as an example, the optimization results show that the method is effective and can realize reliability optimization of machining accuracy.

Enhancing machining accuracy reliability of multi-axis CNC Indexed by: machine tools using an advanced importance sampling method