Method and system for optimizing assembly tilt error of circular grating encoder

Abstract

The invention discloses a circular grating encoder assembly inclination error optimization method and system, and the method comprises the steps: building an assembly model based on the geometric shape error of a bearing part of a circular grating encoder, calculating the inclination deviation of assembly, taking an initial assembly position as a reference, enabling a coded disc installation hub to rotate for a circle when the coded disc installation hub rotates for 30 degrees relative to a central spindle, and enabling the coded disc installation hub to rotate for a circle; analyzing the assembly inclination deviation at each position, establishing an optimal assembly angle model, finding an optimal assembly angle, analyzing and modeling the assembly angle of the circular grating encoder, and establishing an assembly model by sampling the shape error of the assembly surface, so that the measurement efficiency and the measurement precision are improved; the installation of a circular grating bearing part is guided according to the model, so that the installation inclination deviation is reduced, the influence of the installation inclination deviation on the angle measurement precision of the circular grating encoder is reduced, the angle measurement precision is improved, and the method has a remarkable effect and important significance for a precise angle measurement system of the circular grating encoder.

Description

technical field [0001] The invention belongs to the technical field of precision measurement, and in particular relates to a method and system for optimizing an assembly tilt error of a circular grating encoder. Background technique [0002] The circular grating encoder has the advantages of high resolution, small size, convenient installation, fast response, simple processing circuit, etc., and is widely used in aerospace, intelligent robots, high-end CNC machine tools, high-precision coordinate measuring machines and other fields. With the development of science and technology, various instruments and equipment tend to be miniaturized and the requirements for angle measurement accuracy are getting higher and higher, while the small-sized circular grating perfectly fits the requirements of miniaturization and high precision. In the assembly of the grating system, under the condition of a certain processing level, the assembly inclination between the hub of the code disc ins...

AI Technical Summary

Problems solved by technology

[0003] At present, there are few domestic studies on the influence of the assembly tilt error of the circular grating encoder on the angle measurement accuracy. It is generally believed that the tilt error can be ignored when the encoder can work normally.

However, for precision small-size circular grating encoders, due to their small diameter, they are much more sensitive to tilt deviation than ordinary circular gratings, and the installation tilt deviation caused by the surface shape error of the assembly parts has a significant impact on its angle measurement accuracy

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