Method for recognizing key error source affecting precision decay of triaxial machining center

Abstract

The invention discloses a method for recognizing a key error source affecting the precision decay of a triaxial machining center, and belongs to the precision design field of numerical control machinetools. The method comprises the steps: firstly obtaining the error value of each precision item of a machine tool at different measurement time nodes by using a precision measuring device, calculating the error mean value of each precision item from the first measurement to each measurement time node, and determining the distribution interval of the error mean value of each precision item; secondly integrating all error mean values at a tool forming point, integrating the error mean values which are spatially distributed in the space dimension, and then building an integrated spatial error mean value model of the triaxial machining center; finally analyzing the impact on the spatial error mean value from the error mean value of each precision item in the interval according to the distribution interval of each error mean value through a sensitivity analysis method, determining the sensitivity of the integrated spatial error to each precision item, and completing the recognition of thekey error source.

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...

AI Technical Summary

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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