Method and system for measuring geometric error of machine tool based on one-dimensional measuring head and standard balls

Abstract

The invention relates to a method and a system for measuring geometric error of a machine tool based on a one-dimensional measuring head and standard balls. The method comprises the following steps ofS1, according to the type of a numerically-controlled machine tool, arranging the standard balls at multiple position points on the numerically-controlled machine tool, and utilizing the one-dimensional measuring head in the vertical direction to measure the three-dimensional offset of the center of each standard ball on the numerically-controlled machine tool; S2, on the basis of a geometric error model of the numerically-controlled machine tool, obtaining the position-related geometric error of the numerically-controlled machine tool according to the obtained three-dimensional offset of thecenter of each standard ball at each position point in S1. Compared with the prior art, the method has the advantages that the eccentricity of the center of each standard ball due to the geometric error of the machine tool is measured by the one-dimensional measuring head, the measuring value is used as coordinate reference, and the problem of failure of the machine-mounted measuring head due todegrading of the accuracy of the machine tool is effectively solved; the geometric constraint on the measuring head in the measuring process is avoided, the difficulty in numerical control programmingof the movement track of the measuring head is effectively decreased, and the damage risk of the measuring system due to mistake of the movement track is eliminated.

Description

technical field [0001] The invention relates to the field of geometric error measurement of numerical control machine tools, in particular to a method and system for measuring the geometric error of machine tools based on a one-dimensional probe and a standard sphere. Background technique [0002] The geometric accuracy of CNC machine tools is a key indicator to measure the machining accuracy of machine tools. In order to improve the machining accuracy of machine tools, the error compensation method has been widely used and researched because of its economical and effective characteristics. The error measurement and identification of CNC machine tools to obtain the spatial distribution of geometric errors is a key step in the implementation of error compensation. The existing geometric error measurement methods are mainly divided into two categories: direct measurement method and indirect measurement method. The direct measurement method mainly uses precision measuring ins...

AI Technical Summary

Problems solved by technology

However, since the airborne probe uses the internal coordinates of the machine tool, the accuracy of the internal coordinates decreases with the use of the machine tool, and the error accuracy obtained by using the airborne probe will be affected by it.

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