Measurement method and system for detecting coaxiality by using single laser sensor

Abstract

The invention discloses a measurement method and system for detecting coaxiality by using a single laser sensor. According to the measurement method, a measuring system is constructed; the relative positions of the laser sensor and the two to-be-tested holes of a part are adjusted; the feature points of local regions in the two to-be-tested holes are collected through the laser sensor a; data columns collected each time and point intervals on a line light source are combined so as to be converted into a two-dimensional coordinate system, so that elliptic equations are obtained by means of fitting, and the geometric center point of each ellipse is calculated; all the calculated center points of the ellipses are converted to a global three-dimensional coordinate system; the ideal axes and common axis of the two holes are separately obtained by means of fitting; and the coaxiality measurement value of the two to-be-tested holes to be tested is calculated. The method and system of the invention have the advantages of low cost, high efficiency and high industrial automation level in measurement.

Description

technical field [0001] The invention belongs to the technical field of machine vision measurement, and in particular relates to a method and system for measuring the coaxiality of a part with a double-hole structure by using a single laser sensor. Background technique [0002] Coaxiality is a common position error. As a technical index of mechanical parts processing, it has very common requirements in the processing of parts in various fields such as vehicles, medical equipment, and aviation. There are two types of commonly used detection methods for coaxiality errors. One is contact measurement. Although it can achieve better measurement accuracy, it has low efficiency, few sampling points and is easily affected by environmental factors. The other is non-contact measurement. Typical non-contact measurement methods include ultrasonic testing, eddy current testing and laser sensor testing. Among them, the laser sensing detection method has the characteristics of complete in...

AI Technical Summary

Problems solved by technology

At present, most of the research schemes use multiple laser sensors to be placed in the hole to be measured respectively, but this scheme is difficult to realize the detection of the hole to be measured with a small diameter or a large hole depth and uses multiple sensors for measurement. The system structure design is complex, the cost is high and the level of industrial automation is low

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