Machining accuracy reliability analysis of multi-axis CNC machine tools based on polynomial chaos expansions

Abstract

Abstract: To improve the machining accuracy reliability of multi-axis CNC machine tools, an accuracy design method is proposed based on polynomial chaos expansion theory. The comprehensive geometric error model and machining accuracy reliability model of machine tools are built through the use of the coordinate system differential motion matrix method. Through analyzing the reliability sensitivity of machining accuracy, critical geometric error terms which have a large impact on accuracy reliability can be identified. On this basis, combining sensitivity analysis results and accuracy reliability design requirements, the accuracy of machine tools can be optimized to meet the requirement of reliability by adjusting the parameters of geometric error terms with higher sensitivity. Taking a large-scale CNC gantry guideway grinder as an example, the effectiveness of the proposed method is verified. The results show that the proposed method can improve the machining accuracy reliability of machine tools.

Key words: polynomial chaos expansions, differential motion matrix, comprehensive geometric error model, accuracy design, machining accuracy reliability

CLC Number:

TG659
TB114

WANG Zhi-ming, ZHOU Jian, XU Teng. Machining accuracy reliability analysis of multi-axis CNC machine tools based on polynomial chaos expansions[J]. Journal of Lanzhou University of Technology, 2024, 50(6): 42-50.

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