Assessment method for geometric errors of five-axis tool machine

Abstract

The invention discloses an assessment method for geometric errors of a five-axis tool machine, and the assessment method can be applied to a five-axis processing machine. The assessment method includes the steps that an R-test measuring tool with a probe and a standard ball is arranged on the five-axis machining machine, the sphere center of the standard ball serves as the original point of a reference coordinate system, a five-axis synchronous movement path serves as a measuring path to measure the assembly error of the five-axis tool machine, the assembly error obtained through measuring and a known mechanism parameter of the five-axis tool machine are substituted in a geometric error model, and values of 11 items of geometric errors of the five-axis tool machine are obtained through solving by using a method of least square. The assessment method has the advantages of being fast and accurate.

Description

technical field [0001] The present invention is related to tool machinery, in particular to an evaluation method capable of measuring and calculating the geometric error of five-axis tool machinery, which has the advantages of simple construction and high accuracy. Background technique [0002] The error sources of tool machinery are mainly divided into structural errors (Structurally-induced Errors), drive errors (Driven-induced Errors) and static errors (Quasi-static Errors), of which static errors account for about 70% of tool mechanical errors, and static The main source of errors is geometric errors (Geometric Errors). In other words, accurate measurement of geometric errors of tool machinery is a key step to improve tool machining accuracy. [0003] Due to the complex structure of the five-axis machine tool itself, it is very difficult to accurately measure some geometric error items. Therefore, the measurement standard procedure of the five-axis machine tool, such as ...

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Problems solved by technology

[0003] Due to the complex structure of the five-axis machine tool itself, it is very difficult to accurately measure some geometric error items. Therefore, the measurement standard procedure of the five-axis machine tool, such as ISO / 10791-6, is to use a measuring tool, such as the R-Test measuring tool, to carry out After the measurement of the geometric error of the assembly, the partial geometric error items of the rotating shaft are roughly estimated. The overall process is time-consuming, and the estimation results are not accurate enough, which is not conducive to the subsequent error compensation and accuracy improvement of the five-axis tool machinery. It is necessary to further improve

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