Calculating method for ball center coordinate of non-contact R-test measuring instrument using eddy current displacement sensor

Abstract

The invention discloses a calculating method for a ball center coordinate of a non-contact R-test measuring instrument using an eddy current displacement sensor. The calculating method includes the steps that a measuring coordinate system of the non-contact R-test measuring instrument is calibrated according to design and measuring characteristics of the non-contact R-test measuring instrument; and a coordinate result of a ball center point in the measuring coordinate system is solved and exacted using a differential evolution algorithm according to an eddy current displacement sensor inducedvoltage characteristic curve equation and a sensor induced plane equation. According to the calculating method for the ball center coordinate of the non-contact R-test measuring instrument using the eddy current displacement sensor, accurate measuring of three-direction displacement errors of five-axis numerically controlled machine tool knife tool cutter location points is realized, and the measuring accuracy, range and stability are better.

Description

Technical field [0001] The invention relates to the technical field of error measurement of numerical control machine tools, in particular to a method for calculating spherical center coordinates of a non-contact R-test measuring instrument using an eddy current displacement sensor. Background technique [0002] With the improvement of machining accuracy, the geometric error measurement of five-axis CNC machine tools has become increasingly important. For the rotation axis of five-axis CNC machine tools, accurate measurement of the error of the machine tool tip point is the key to error compensation to improve its machining accuracy. There are no special precision measuring instruments and specifications for the geometric error measurement of the machine tool rotation axis. The measuring instruments usually used are ballbar and laser interferometer. However, these measuring instruments are not dedicated to the error measurement of the rotating shaft, and have disadvantages such a...

AI Technical Summary

Problems solved by technology

The measurement algorithm of the contact R-Test instrument is relatively simple, and the deviation of the sensor installation position will not affect the measurement results, but the reading sensitivity of the sensor is not high due to mechanical structure problems, and the contact wear also affects the measurement accuracy to a certain extent

The non-contact R-test instrument can avoid the measurement error caused by the measurement of wear, and can be measured under the condition of high-speed rotation of the spindle. The measurement sensitivity and stability are better, but the spherical center coordinate measurement algorithm is complex and not yet perfect.

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