Device and method for measuring rotation angle error of rotary table of machine tool

Abstract

The invention discloses a device for measuring rotation angle error of a rotary table of a machine tool. The device comprises a support fixed on the rotary table; a reflecting mirror keeping running fit with the support; a magnetic field generator for generating a magnetic field; a magnetic field sensing member fixedly mounted on the reflecting mirror for keeping the direction of the reflecting mirror under the action of the magnetic field; and a laser ranging device for transmitting / receiving a laser beam to / from the reflecting mirror, and transforming the distance change of the reflecting mirror to the actual rotation angle of the rotary table. The device is simple in structure, convenient in measurement and easy to implementation, and can guide the direction of the reflecting mirror without contacting the reflecting mirror through the magnetic field and the magnetic field sensing member so as to facilitate distance measurement by the laser ranging device. The invention also discloses a method for measuring the rotation angle error of the rotary table of the machine tool. The method is convenient and accurate in measurement, and can calculate the error according to the actual rotation angle and a preset angle so as to provide the basis for error compensation of the machine tool.

Description

technical field [0001] The invention relates to the field of measuring devices and methods for the angle error of a rotary table of a machine tool, in particular to a device and method for measuring the angle error of a rotary table of a five-axis linkage numerically controlled machine tool. Background technique [0002] With the continuous development of modern manufacturing technology, higher requirements are put forward for precision machining technology. The accuracy indicators for evaluating CNC machine tools mainly include geometric positioning accuracy and machining accuracy, which are all affected by factors such as machine tool structure, assembly accuracy, servo system performance, and external environment. The precision of machine tools is not only an urgent need in industrial fields such as automobiles, electronics, and medical equipment, but also the foundation of modern defense industries such as aerospace, missile satellites, and new weapons. Therefore, how t...

AI Technical Summary

Problems solved by technology

Although the disclosed measurement method can calculate the rotation angle error through the standard ball and the infrared three-dimensional workpiece probe, the measurement accuracy of the infrared three-dimensional workpiece probe is not high, and there is a certain error in the coordinate measurement of the ball center movement track position of the standard ball. The accuracy of the rotation angle error of the rotary table of the CNC machine tool calculated by this measurement method is low

[0005] The Chinese patent application with the publication number CN102001021A discloses a method for measuring the geometric error parameter value of the swing axis of a five-axis linkage CNC machine tool. The coordinates of the translation axis linkage provided by the RTCP tool center point control function of the five-axis machine tool are used as the measurement reference. The ballbar measures the displacement errors in the X, Y, and Z directions of at least three positions at different rotation angles of the rotary swing axis, and calculates the geometric error of each rotation angle of the rotary swing axis according to the displacement error data processing and identification. Although this measurement method It can comprehensively detect all twelve geometric error parameters of the rotary and oscillating axis of the five-axis linkage CNC machine tool, but this measurement method requires more data to be measured, and the measurement process is more complicated, and its simplicity needs to be further improved

Images