Machine tool error modeling method based on two-dimensional Abbe error and instantaneous movement center

Abstract

The invention discloses a machine tool error modeling method based on a two-dimensional Abbe error and an instantaneous movement center, and relates to the technical field of machine tool error compensation. The machine tool error modeling method comprises the following steps: analyzing a deflection instantaneous center, a pitching instantaneous center and a rolling instantaneous center of an X and Y-axis guide track system of a stack working table; analyzing the deflection instantaneous center, the pitching instantaneous center and the rolling instantaneous center of a Z-axis guide track system; establishing corresponding deflection-Abbe error, pitching-Abbe error and rolling-Abbe error models. By adopting the machine tool error modeling method, the deflection instantaneous center, the pitching instantaneous center and the rolling instantaneous center of guide track systems in different motion directions can be analyzed, and the corresponding deflection-Abbe error, pitching-Abbe error and rolling-Abbe error models can be established. The zero drift error, the indication error and the guide track system Abbe error of a grating measurement system can be comprehensively considered according to the multi-body dynamic theory, a comprehensive numerically-controlled machine tool error model can be established, basis can be provided for next error compensation, and thus the processing precision of a numerically-controlled machine tool can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of machine tool error compensation, in particular to a machine tool error modeling method based on two-dimensional Abbe errors and instantaneous motion centers. Background technique [0002] At present, most machine tools adopt a stacked structure, that is, the slide plates in the two moving directions of x and y are superimposed and installed on the bed, and each direction is supported by two guide rails to move in one direction. The workbench is installed on the sliding plate, and the workpiece is positioned on the workbench, so the comprehensive error of the two guide rails in each direction will directly affect the machining accuracy of the workpiece. [0003] The influence of the error of the guide rail system in one direction of the machine tool is two-dimensional. It will not only produce the common linear value error and angular motion error in this direction, but also transmit it to the guide rail s...

AI Technical Summary

Problems solved by technology

[0014] The technical problem to be solved by the present invention is to provide a machine tool error modeling method based on two-dimensional Abbe error and instantaneous center of motion, consider the concept of two-dimensional Abbe error in one-way motion of the guide rail, and establish a guide rail system for each axis. The Bay error compensation model overcomes the traditional method of analyzing the center of rotation of the worktable, which considers the center of rotation to be the reference point of the grating measurement system. The existing error compensation method uses the coordinates of the workpiece processing point to calculate the Abbe arm and the actual Abbe arm size different, making the effect of machine tool error compensation unsatisfactory

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