A method for measuring the fillet radius of shaft parts with multiple fillets on the end face

Abstract

The invention discloses a fillet radius measuring method of an end-surface multi-fillet shaft type part. The method includes the following steps that: (1) the end face image of the end-surface multi-fillet shaft type part is collected; (2) an image coordinate mapping matching relation between the end face image of the end-surface multi-fillet shaft type part to be detected and a template image is built through template matching; (3) the edge blur interference of the end-surface multi-fillet shaft type part is eliminated through morphological opening operation; (4) the contour coordinates of the end-surface multi-fillet shaft type part in a region of interest is obtained through an edge detection operator and an eight-neighborhood boundary tracking algorithm; (5) the segmentation points of each fillet area are obtained through discrete point curvature calculation, and the pixel value of the radius of each fillet is obtained through least square circle fitting; and (6) the actual values of the radiuses of the fillets of the shaft type part are obtained through calibration. With the method of the invention adopted, non-contact measurement can be realized, the problems of slow detection speed, low efficiency and poor precision of manual detection can be solved, and the automation degree and product quality of the end surface multi-fillet shaft type part is improved.

Description

technical field [0001] The invention relates to the field of machine vision, in particular to a machine vision-based method for measuring the fillet radius of shaft parts with multiple fillets on the end face. Background technique [0002] In the aviation industry and the automobile industry, the precision requirements for shaft parts with multiple fillets on the end face are very strict, and there are even further strict requirements on the fillet radius. During the process of shaft parts being processed into fillets, there is more or less a certain deviation in the fillet radius. Therefore, it is necessary to check whether the fillet radius of the fillet meets the requirements. However, the traditional measurement method is generally through manual measurement of the R gauge. Visual comparison shows that this method not only has low efficiency and poor precision, and cannot adapt to the needs of modern production, but also cannot measure parts with multiple rounded corners...

AI Technical Summary

Problems solved by technology

However, this invention patent application can only be used for the detection of shaft parts with single rounded corners on the end face, and cannot be used for the detection of shaft parts with multi-rounded corners on the end face. The size cannot be expressed, and the accuracy of the test results of the invention patent application is greatly affected by the environment

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