High-precision small modulus gear vision measurement method

Abstract

A high-precision small modulus gear vision measurement method is disclosed. The method is characterized by after a CCD camera is calibrated, carrying out small modulus gear coordinate conversion, outputting an actual physical coordinate of a small modulus gear and calculating a correlation parameter coordinate scale factor, a rotation matrix and a translation matrix; reflecting a space position relation between a gear to be measured and a measurement system in the measurement system; carrying out image processing, wherein a processed object is a small modulus gear edge contour image acquired from a CCD camera 3; and carrying out denoising; then using and carrying out 1 / 8 sub-pixel edge extraction, extracting an edge point coordinate, carrying out center fitting and acquiring a center coordinate of the image; according to an edge point, acquiring a basic gear parameter, wherein the basic parameter is a tooth number, a mode number, a reference circle diameter and a pressure angle; fitting a standard gear contour curve; and comparing an actually-acquired edge contour curve with a theoretical contour curve so as to acquire a pitch deviation and a tooth profile deviation. The basic gear parameter and quality can be comprehensively analyzed and evaluated.

Description

technical field [0001] The invention relates to the field of precision testing technology and instruments, in particular to a high-precision small modulus gear visual measurement method. Background technique [0002] Due to its high transmission precision, small modulus gears are widely used in aviation machinery, electronic products, precision machinery, instrumentation and timing structures. Small modulus gears are affected by their geometric dimensions and mechanical properties, and their measurement difficulty is much higher than that of medium modulus gears. With the rapid development of the precision manufacturing industry, the requirements for the precision of small modulus gears are getting higher and higher, and their sizes are getting smaller and smaller. challenge. How to improve the measurement accuracy of small modulus gears has gradually become a research hotspot in recent years. [0003] Small modulus gears have small tooth space, poor tooth stiffness, and ...

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Problems solved by technology

[0003] Small modulus gears have small tooth space, poor tooth stiffness, and are easy to deform. The central aperture problem affects positioning. In the actual gear measurement process, it is difficult to clamp and find the measurement reference. In the actual clamping of the workpiece, especially For some gear workpieces without a mandrel, the center of rotation of the gear workpiece does not coincide with the center of rotation of the gear measurement center, and the installation eccentricity has a direct impact on the measurement results of the tooth pitch error and tooth profile error. Among them, the eccentricity of the tooth pitch The largest impact, the installation eccentricity affects the cumulative error of the tooth pitch with a relationship of nearly two times, and the exact deviation of each item cannot be measured

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