Straightness error detection method of linear guide rail of CNC machine tool

Abstract

The invention provides a linearity error detecting method of a linear guide rail of a numerically-controlled machine tool having higher measurement precision. The method comprises the following stepsthat 1, a water trough is put under the linear guide rail; 2, a slide plate is installed on the linear guide rail, a laser displacement sensor is fixed to the slide plate, and a measurement head detection point of the laser displacement sensor is pointed to water surface; 3, the slide plate is moved to one end of a detection journey before detection, then the slide plate is opened to perform constant-speed movement, meanwhile the measurement head and water surface distance measured by the laser displacement sensor is recorded, data recording is stopped when the slide plate moves to the other end of the detection journey, change of the distance between the measurement head of the laser displacement sensor and the water surface of the water trough is obtained, namely the linearity error of the linear guide rail. The water surface is adopted as a reference object, the change between the measurement head and the water surface is detected through the laser displacement sensor, and accordingly the linearity error of the linear guide rail is obtained. Due to the fact that the water surface has excellent planeness, the detection precision is higher.

Description

technical field [0001] The invention belongs to the field of industrial automatic processing and detection, and in particular relates to a straightness error detection method of a linear guide rail of a numerically controlled machine tool. Background technique [0002] The precision linear guide is the key moving part of the CNC machine tool. As the key performance index of the precision linear guide, the straightness error has an important impact on the machining accuracy. The traditional measurement methods of straightness error mainly use level instrument, autocollimator, laser interferometer and so on. When using a level meter and an autocollimator to measure, the measured straight line is divided into several small segments or pitches, and after the relative value of each segment is measured, the overall straightness error is obtained through data processing. Therefore, each segment measured by this method The error value of the distance is the comprehensive effect of ...

AI Technical Summary

Problems solved by technology

When using a level meter and an autocollimator to measure, the measured straight line is divided into several small segments or pitches, and after the relative value of each segment is measured, the overall straightness error is obtained through data processing. Therefore, each segment measured by this method The error value of the pitch is the comprehensive effect of the pitch of this section, the distance between adjacent measurement points is greatly limited, and the measurement accuracy is difficult to reach a high level

The accuracy of laser interferometer detection is better, but its price is higher, which limits its popularization and application

ZL201410215860.7 discloses a method of measuring the straightness error by measuring the standard mirror with a laser displacement sensor. However, the standard mirror used for measurement has certain errors, which affects the measurement accuracy.

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