Turntable error identification and compensation method for cylindrical coordinate measuring machine

Abstract

The invention provides a turntable error identification and compensation method for a cylindrical coordinate measuring machine. The method comprises the steps that a turntable coordinate system is established in the center of the turntable, six geometric errors are identified through a rotary shaft calibration device, a laser interferometer and a ball rod instrument according to a turntable geometric error transformation matrix, and the operation process is as follows: when the turntable coordinate system is established in the center of the turntable and the turntable rotates for an angle, thecorresponding turntable geometric error transformation matrix is obtained; six geometric errors of the turntable of the cylindrical coordinate measuring machine are identified in two steps: a) a rotary shaft calibration device and a laser interferometer are matched for use to identify error terms; and b) the other five geometric errors are identified by adopting five attitudes of the installationpositions of the ball rod instruments at two heights, and six geometric errors corresponding to any rotation angle by utilizing linear interpolation is obtained after a discrete angle six geometric error table is obtained through the above two steps, so that the operation difficulty is reduced.

Description

technical field [0001] The invention relates to the technical field of precision measurement, in particular to a method for identifying and compensating errors of a turntable of a cylindrical coordinate measuring machine. Background technique [0002] The traditional three-coordinate measuring machine can detect the size, shape and position of parts, and has a wide range of applications in the fields of machining measurement such as machinery manufacturing, automobile production lines and aerospace. However, for the measurement of rotating parts, such as engine sleeves, aeroengine blades, etc., it is possible to construct a cylindrical coordinate measuring machine-including two translational axes and a rotating axis for measurement, compared to directly measuring on a traditional three-dimensional coordinate measuring machine Configure the turntable to become a four-axis coordinate measuring machine to measure rotary parts. The cylindrical coordinate measuring machine has on...

AI Technical Summary

Problems solved by technology

The typical equipment is a five-axis CNC machine tool, which is equipped with two turntables. The ballbar is a very important instrument for geometric error identification. There are high requirements for the real-time position of the ballbar in various identification methods, such as the rotation of the turntable. In the process, it is necessary to ensure that the ballbar is parallel to the coordinate axes in real time. Since the cylindrical coordinate measuring machine has only two translation axes, it is very difficult to use only the ballbar to compensate the six geometric errors of the cylindrical coordinate measuring machine turntable.

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