Calculation and impact assessment method of geometric error contribution value of motion axis of five-axis machine tool

Abstract

The invention discloses a calculation and influence evaluation method of a geometric error contribution value of a motion axis of a five-axis machine tool. The method comprises steps of S1, setting astructural parameter q of each motion axis according to a five-axis machine tool structure; S2, acquiring geometric error spins of three translation axes and three rotary axes; S3, calculating and obtaining a geometric error component of each motion axis in a cutter coordinate system; S4, building a motion axis error matrix in a cutter coordinate system, and obtaining a geometric error contribution value of each motion axis; S5, adding geometric error contribution values of all motion axes of the five-axis machine tool so as to obtain a comprehensive cutter position error and a cuter gesture error of the five-axis machine tool; S6, evaluating influence of errors of the motion axes on the five-axis machine tool in all directions, and selecting a motion axis with high influence in each direction of the five-axis machine tool; and S7, calculating a position error influence coefficient and a gesture error influence coefficient of the motion axis, evaluating influence of the motion axes onprocessing accuracy of the five-axis machine tool, and selecting a key motion axis of the five-axis machine tool.

Description

technical field [0001] The invention belongs to the technical field of numerically controlled machine tools, and in particular relates to a method for calculating contribution value of geometric errors of motion axes of a five-axis machine tool and evaluating its impact. Background technique [0002] High precision has become an inevitable trend in the development of high-end CNC machine tools including five-axis CNC machine tools. Among the many factors affecting the machining accuracy of CNC machine tools, geometric errors and thermal errors are the main error sources of high-end CNC machine tools, accounting for about 60% of the total manufacturing errors. The good repeatability and long-term stability of geometric error make geometric error compensation technology an important economical and effective means. The difference between thermal error and geometric error is that it has temperature-changing characteristics. Under a certain temperature environment, thermal error...

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Problems solved by technology

[0004] The purpose of the present invention is to address the above-mentioned deficiencies in the prior art, and provide a method for calculating and evaluating the contribution value of the geometric error of the motion axis of a five-axis machine tool, so as to solve or improve the above-mentioned problems

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