Affiliation:
1. School of Mechanical Engineering, Yangzhou University, Yangzhou, Jiangsu, China
2. Guangxi Key Laboratory of Manufacturing System and Advanced Manufacturing Technology, Nanning, Guangxi, China
3. State Key Laboratory of Mechanical Transmissions, Chongqing University, Chongqing, China
Abstract
Taking into consideration the dynamic characteristics of motion error propagation in CNC machine tools, in order to enhance the accuracy of PRUL (precision remaining useful life) prediction analysis, this paper presents a precision degradation modeling approach based on MAU (meta-action unit) for CNC machine tools. Firstly, from the perspective of motion, the CNC machine tool is divided into the smallest unit by the decomposition of FMA (Function-Motion-Action). Secondly, the MBS (multi-body systems) theory is used to topologically describe the motion relationship between the MAU, and the spinor theory is used to model the motion error. Thirdly, considering the influence of multiple error sources on the PRUL of the CNC machine tool MAU, the motion transmission ratio is used to synthesize multiple error sources, and combined with the constructed error model, the precision degradation model of MAU is constructed, and its PRUL is accurately predicted. Finally, the CNC turntable is selected as the experimental subject to compare the proposed method with commonly used methods in terms of rationality, applicability, and simplicity, and the results verify the applicability and correctness of the method proposed in this paper.
Funder
National Major Scientific and Technological Special Project for “Highgrade CNC and Basic Manufacturing Equipment” of China
National Natural Science Foundation of China
Guangxi Key Laboratory of Manufacturing System & Advanced Manufacturing Technology of China