Numerical control machine tool rotating shaft geometric error three-wire measurement method

Abstract

Disclosed is a numerical control machine tool rotating shaft geometric error three-wire measurement method. High-accuracy calibration of space coordinates of a laser tracker base station can be rapidly finished by the aid of a cat eye and a rotatable cat eye bracket, the influence of a machine tool system error is eliminated by calibration accuracy, rotating movement of three fixed points of a single rotating shaft of a machine tool around an axial line is successively measured at four different measurement positions by the aid of one laser tracker, the cat eye and the rotatable cat eye bracket, real-time poses of the rotating shaft are calculated by the aid of continuous movement tracks of the three fixed points in a space, errors of the rotating shaft of the machine tool are identified, acquired information of the machine tool is rich as the real-time poses of the moving shaft are measured, an error identification algorithm is quite simple and applicable to rapid data processing and rapid compensation of the machine tool errors. The numerical control machine tool rotating shaft geometric error three-wire measurement method has the advantages of low cost, high accuracy, rapidness and simplicity in operation, rich measurement information and the like, and is suitable for accuracy detection in the field of numerical control machine tools.

Description

technical field [0001] The invention relates to the technical field of measurement of a turntable of a numerical control machine tool, in particular to a three-line measurement method for the geometric error of a rotational axis of a numerical control machine tool. Background technique [0002] Geometric error is the most important factor affecting the machining accuracy of CNC machine tools. Therefore, quickly and accurately detecting various geometric errors of the machine tool and performing error compensation is one of the important ways to improve the machining accuracy of the machine tool. At present, there are many methods for detecting the error of the linear axis of machine tools, but there are relatively few methods for detecting the error of the rotary axis, which is also one of the difficulties in machine tool inspection. Using the autocollimator and polyhedron can only evaluate the positioning error of the turntable, but cannot measure other errors. Various err...

AI Technical Summary

Problems solved by technology

Using autocollimator and polyhedron can only evaluate the positioning error of the turntable, but cannot measure other errors

Various errors of the turntable can be measured by using the laser interferometer, the RX10 rotary accuracy measuring instrument of the British Renishaw company and other auxiliary measuring tools, but the detection period is long; when using the ballbar to measure, the multi-axis linkage of the machine tool is required, and The ballbar needs to be measured in different modes, and the measurement process is more complicated

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