Hole making and riveting quality control method and device based on machine vision

Abstract

The invention discloses a hole making and riveting quality control method and device based on machine vision. The device can achieve shooting of a plane hole or a curved hole in a workpiece through a CCD camera through the linkage of a first sliding table, a second sliding table, a first sliding block, a second sliding block and a connecting rod, the diameter and the roundness of the hole are detected through gray processing, median filtering, threshold segmentation, edge extraction, least square fitting and other operations, the structure is stable, the automation degree is high, operation is easy, the detection precision is high, and distortion can be avoided when the curved hole is detected. The method is based on an engineering calculation method, a relation model of a pressing riveting force and the size of an upset head is obtained under the condition that the influence of friction force of the end face of the upset head on normal stress is considered, a process monitoring riveter is arranged for workers to indirectly control the size of the upset head through the pressing riveting force, the pressing riveting quality control precision is high, timely discovery and timely remedy can be achieved, error accumulation is avoided, and therefore, the riveting quality and efficiency are improved.

Description

technical field [0001] The invention relates to the technical field of riveting, in particular to a machine vision-based hole making and riveting quality control method and device thereof. Background technique [0002] The riveting process is widely used in equipment manufacturing in the aviation and aerospace fields due to its simple process and stable and reliable connection strength. However, with the high-quality and high-efficiency development requirements of the equipment manufacturing industry, higher requirements are put forward for the quality of riveting, and the quality of hole making and the size of the upset head after riveting directly affect the quality of riveting. Therefore, the research and development of It is of great practical significance to develop a hole quality detection device and study the method of heading size control. [0003] The current patent disclosure and literature data show: 1) The patent (CN201410683172.3) installs the visual imaging sy...

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Problems solved by technology

[0005] The purpose of the present invention is to solve the above problems and provide a machine vision-based hole making and riveting quality control method and its device. The device has a stable structure, a high degree of automation, and simple operation. Two light sources, white light and green light, can be selected. , whether it is detecting the hole-making quality of large workpieces or small workpieces, clear original pictures can be collected; the original pictures are processed by grayscale processing, median filter processing, threshold segmentation, edge extraction, etc., and the images are removed by bwareaopen and imdilate commands The interference point in the center can significantly improve the detection accuracy of the hole-making quality; the linkage between the first slider and the second slider can drive the conical head to move to the position of the hole to be tested, and the conical head can be inserted into the hole by pulling out the push rod. According to the automatic centering function of the conical head, the conical head is aligned with the hole to be measured, and then the CCD camera is aligned with the hole to be measured by rotating the turret 180 degrees, thereby realizing the detection of the quality of the curved surface and avoiding distortion; based on engineering calculations The relationship model between the pressure riveting force and the size of the head is obtained under the condition of considering the influence of the friction force of the end surface of the head on the normal stress. The precision is high, and the size of the head can be indirectly controlled by the pressure riveting force, thereby improving the quality of the pressure riveting; Equip workers with process monitoring riveting guns to control the size of the heading head through the pressure riveting force, which can realize timely detection and timely remedy, avoid error accumulation, thereby improving assembly quality and efficiency

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