Four-point dynamic measurement and separation method of spindle rotation errors

Abstract

The present invention provides a four-point dynamic measurement and separation method of spindle rotation errors. A sensor support is positioned, and high-precision displacement sensors are subjectedto system calibration; each two of the four sensors are installed on the sensor support in an opposite mode, a tested part is operated, and a sampling frequency f, single-loop sampling points and sampling duration are calculated according to a rotating speed of the tested part; the displacement sensors are employed to obtain rotation position information of the tested part, and the obtained displacement sampling signals are calculated and analyzed through an error separation formula, and rotation errors and section circularity errors of a rotated shaft are obtained; and the circularity errorsand the rotation errors are subjected to quantification evaluation, and dynamic rotation errors of the tested part in the rotation operation and the shape errors of a tested section contour are obtained. The four-point dynamic measurement and separation method of the spindle rotation errors can reduce the change amount of the shaft section errors caused by thermal deformation, and employs a dynamic separation equation to separate the circularity errors and the rotation errors of the same magnitude so as to accurately obtain the rotation errors of the spindle.

Description

technical field [0001] The invention belongs to the technical field of spindle detection, and in particular relates to a four-point dynamic measurement and separation method of a spindle rotation error. Background technique [0002] The accuracy of the core components of the machine tool determines the overall machining quality of the machine tool to a large extent, and as the most important part of the core components, the rotation error of the spindle system is one of the main factors affecting the machining accuracy of the machine tool. Spindle rotation error is of great significance for the evaluation of spindle rotation accuracy, detection of spindle operation failure, prediction of machine tool surface shape error, and machining error compensation for the purpose of improving the machining accuracy of machine tools. In practice, due to the processing and assembly errors of the spindle and the dynamic and static forces in the rotation process, the rotation axis of the s...

AI Technical Summary

Problems solved by technology

In addition, when the installation angle between the sensors does not have the least common divisor, there is a large sampling error in the real-time calculation of the single-turn sampling amount between the spindle speed and the sampling frequency

Due to the sensitivity of the error separation result to the sensor installation angle error, many difficulties have been caused to the actual measurement

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