A kind of curved plate incremental forming in-situ shape adjustment detection system and method

Abstract

The invention provides a system and method for in-situ shape adjustment detection of curved plate progressive forming. The detection bracket is arranged on the upper mold base and can slide horizontally along the upper mold base; the detection bracket is provided with an image acquisition device and an active light projection device. ; The image acquisition device is used to collect three-dimensional point cloud data on the surface of the curved plate on the lower mold base; the active light projection device is used to provide a light source for the image acquisition device; the method is based on the optical shape adjustment detection technology, by means of the active light projection device. Scan the curved plate, use the image collector to collect the picture of the curved plate irradiated by active light, and obtain the three-dimensional point cloud data of the curved plate through image processing, and use the point cloud splicing technology to measure the registration and deviation of the point cloud and the theoretical point cloud Computational technology to obtain the deviation data of curved plate processing and forming, and automatically generate processing shape adjustment files. Compared with the traditional sample case detection and manual shape adjustment method, the present invention has the advantages of high efficiency and precision of in-situ shape adjustment detection, quantifiable shape adjustment detection results and good readability.

Description

technical field [0001] The invention relates to the fields of shipbuilding and in-situ shape adjustment detection, in particular to a system and method for in-situ shape adjustment detection of curved plate progressive forming. Background technique [0002] Hull construction is an important part of the entire ship production, accounting for about 30% to 40% of the total ship production workload. Due to the complex line shape of the hull shell, the forming and processing of ship curved plates has always been a difficult problem in the shipbuilding industry. The most representative bending plate operation accounts for about 10% to 18% of the hull steel processing workload. At present, the forming process of curved plate mainly relies on experienced workers to make the plate forming meet the requirements through repeated processing. Therefore, due to the inadequacy of the current curved plate processing technology, it is difficult to process the complex ship curved plate in on...

AI Technical Summary

Problems solved by technology

[0004] (1) The accuracy of shape adjustment detection is low, and the accuracy of curved plate forming is difficult to guarantee

When using the sample box to adjust the shape, the workers directly observe the forming state of the curved plate with the naked eye, resulting in a large detection error

In addition, for the wooden sample box, it is easily deformed by the influence of ambient temperature and humidity, and its precision is not high;

[0005] (2) High work intensity and low efficiency of shape adjustment detection

Moreover, in the process of curved plate forming, it is often necessary to repeat the measurement many times.

Therefore, the manual shape adjustment detection of the sample box is not only labor-intensive, but also the shape adjustment detection efficiency is low;

[0006] (3) Quantitative shape adjustment test results cannot be formed

However, the measurement range of the system is small, and it is difficult to adapt to larger ship plates

(4) Wang Zhenxing from Shanghai Jiaotong University projected circular spots on the surface of the ship's curved plate as the measurement feature, and used the area array structured light active binocular stereo vision technology based on the circular spot array to measure the ship's curved plate. The system measured speed Fast, but the measurement range is small, and due to the complex environment of the shipyard, it is very difficult to accurately detect the projected circular spots on the surface of the ship plate, making the system not stable

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