Device and method for detecting size of internal groove of small-size workpiece through asynchronous exposure of multipoint light source

Abstract

The invention discloses a device and method for detecting the size of an internal groove of a small-size workpiece through the asynchronous exposure of a multipoint light source. The device comprises an experiment table, a square framework, a small-size workpiece visual collection assembly, a control cabinet, and a buzzer. The method comprises the steps: enabling the lightproof square framework to be disposed on the experiment table in a covering manner and forming an internal dark box environment; placing the small-size workpiece visual collection assembly in the internal dark box environment; carrying out the calibration of an industrial camera, and obtaining the value of a pixel single quantity; taking a contour image, and marking a measuring point as a template image; placing a to-be-detected workpiece, respectively turning on parallel light sources at two sides for asynchronous exposure, collecting the upper and lower contour images, carrying out the matching with the template image, moving the measuring point of the template image to the lower contour image, carrying out the fusion of upper and lower contour images, calculating the distance between the lower and upper contour images, and obtaining a result. The device can method can carry out the multipoint detection of the size of the internal groove of a complex workpiece quickly and accurately, is high in detection efficiency, and is high in precision.

Description

technical field [0001] The device relates to a workpiece detection device and method, in particular to a machine vision-based detection device and method for detecting the inner groove size of a small workpiece with multi-point light source asynchronous exposure, and is applicable to various sizes of inner grooves of different workpieces. Point size measurement is also applicable to workpieces with complex inner groove contour structure and various inner groove structure shapes. Background technique [0002] For inner groove workpieces, taking car keys as an example, there are many inflection points that need to be detected. Using traditional calipers to measure, there will be problems such as low quality efficiency and low precision, and it is easy to damage the surface of the workpiece and scratch it. The measurement method of machine vision is used to detect the inner groove size of the workpiece, which can realize the rapid and accurate detection of the multi-point size ...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is: the traditional detection of the size of the inner groove of the small workpiece is mainly the size and width of each inflection point, the corner point, the measurement points are more, the measurement error is large, and the efficiency is relatively low. In order to overcome the existing large detection error and low efficiency, Human factors determine the disadvantages of product quality, and provide an efficient, fast and accurate multi-point detection device and method for inner tank size

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