Machine tool rotating shaft geometric error identification method and device and storage medium

Abstract

The invention provides a machine tool rotating shaft geometric error identification method and device and a storage medium, and the method comprises the steps: installing a visual target and a monocular camera, and calibrating the installation error; identifying a C-axis geometric error; measuring the cutter length and the Y offset of the visual target; a plurality of machine tool program coordinates are randomly selected, at each machine tool program coordinate, an A axis is controlled to be static, a C axis is controlled to do RTCP motion and stop at equal intervals, a mark C sequence image is collected, a three-dimensional coordinate deviation of a visual target at each stop position of each machine tool program coordinate is obtained, and a geometric error of the C axis is calculated; a plurality of machine tool program coordinates are randomly selected, at the positions of the machine tool program coordinates, the C axis is controlled to be static, the A axis does RTCP motion and stops at equal intervals, mark A sequence images are collected, the three-dimensional coordinate deviation of the visual target at each stopping position of the machine tool program coordinates is obtained, and the geometric error of the A axis is calculated according to the three-dimensional coordinate deviation. The method is high in measurement efficiency and precision.

Description

technical field [0001] The disclosure belongs to the field of geometric error measurement of machine tools, and is aimed at a geometric error identification method, device and storage medium of a rotating axis of a five-axis numerically controlled machine tool. Background technique [0002] According to the error definition of the machine tool, the difference between the ideal response and the actual response of the machine tool is the error of the machine tool. There are many sources of error in the machine tool. According to the different sources of machine tool errors, machine tool errors can be divided into geometric errors, thermal errors, force errors and Control errors, etc., the first three error sources are called quasi-static error sources, which are the source of the gap between the ideal position and the actual position of the machine tool in the workpiece coordinate system. The quasi-static error sources will change slowly over time and depend on the machine tool...

AI Technical Summary

Problems solved by technology

[0006] The main disadvantages of the existing R-test measuring instrument and ballbar are that the measurement cost is relatively high, the structure is relatively complicated, and the measurement time of the ballbar is long, while the visual measurement has the advantages of low measurement cost, high measurement accuracy and measurement efficiency. It can be applied to the error measurement of the rotary axis of the five-axis machine tool

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