A Method for Identifying Key Error Sources Affecting Accuracy Decay of Three-axis Machining Center

Abstract

The invention relates to a key error source identification method that affects the precision decay of a three-axis machining center, and belongs to the field of precision design of numerical control machine tools. The method first uses a precision measuring device to obtain the error values ​​of various precision of the machine tool at different measurement time nodes, and calculates each precision The error mean value of each item from the first measurement to each measurement time node is determined, and the error mean value distribution interval of each precision is determined; then, the error mean value of each item is integrated at the tool forming point, and the error mean value of the spatial distribution is integrated in the space dimension , and then establish the comprehensive spatial error mean value model of the three-axis machining center; finally, according to the distribution interval of each error mean value, the sensitivity analysis method is used to analyze the influence of the error mean value of each precision index in the interval on the comprehensive spatial error mean value, and determine the comprehensive spatial error value For the sensitivity of various precision indicators, the identification of key error sources is completed.

Description

technical field [0001] The invention belongs to the field of precision design of numerical control machine tools, in particular to a key error source identification method that affects the precision decay of a three-axis machining center. Background technique [0002] Accuracy decay is one of the important factors affecting the performance of CNC machine tools. Compared with foreign machine tools of the same type, domestic machine tools generally expose the problem of rapid accuracy decay. The accuracy change of CNC machine tools is a complex, multi-factorial, and comprehensive process that evolves dynamically over time. In the process of machine tool design and manufacture, due to unreasonable design and concentrated stress generated by improper assembly, the basic parts of the machine tool are abnormally deformed and excessively worn during the service process, resulting in the rapid decline of single or several accuracy indicators of the machine tool , resulting in a ra...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of the existing methods, aiming at the accuracy decay problem of the three-axis machining center, and inventing a key error source identification method that affects the accuracy decay of the three-axis machining center

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