On-line detection method for line heating forming

Abstract

The invention discloses an on-line detection method for line heat forming of a ship outer plate, and belongs to the field of shipbuilding technologies and optical measurement. The method comprises the following steps: A, establishing a ship theoretical model point cloud; B, scanning and obtaining a ship measurement point cloud; C, performing coordinate system registration for ship theoretical model point cloud and the ship measurement point cloud; D, calculating the distance between every point in the ship measurement point cloud and a theoretical curve surface so as to present the deviation between the measurement point cloud and the theoretical model point cloud; E, expressing the deviation value by a color map. Compared with a traditional sample case / sample plate detection method, the method is high in detection efficiency and precision, and the detection result can be quantized and is good in readability.

Description

technical field [0001] The invention relates to an on-line detection method for bent plate forming, in particular to an on-line detection method in the water-fired plate bending process. It belongs to the field of shipbuilding technology and optical measurement. Background technique [0002] Water-fire bending plate forming technology is a widely used plate forming process with strong technicality, great difficulty and many influencing factors in the world shipbuilding industry. How to quickly and accurately detect and judge the shape error between the processed hull curved plate and the target curved plate is a key technology that needs to be solved urgently in the shipbuilding industry. [0003] At present, shipyards mainly rely on experienced workers to detect and judge the shape error between the processed hull curved plate and the target curved plate by clamping the sample plate and sample box. However, there are many disadvantages in this method: (1) The preci...

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Problems solved by technology

However, there are many disadvantages in this method: (1) The precision of the template and sample box determines the processing accuracy of the curved plate, and most of the template and sample box are made of wood, which will be greatly deformed due to environmental influences such as weather. The detection error is relatively large, and the forming accuracy is difficult to guarantee, which sets up obstacles for the follow-up shipbuilding precision control. According to the research, this kind of processing error can sometimes reach 20mm, which cannot meet the requirements of precision shipbuilding; The technical level is high; (3) a large number of sample boxes and samples need to be produced, which wastes wood; (4) the production efficiency is low, resulting in a long shipbuilding cycle, which is seriously inconsistent with the increasingly competitive world shipbuilding market, etc.

But there are also many disadvantages: (a) the measurement process requires a lot of manual operations, resulting in low measurement efficiency; (b) the use of CMM has high requirements for on-site environmental conditions; (c) the expansion of CMM measurement range requires a lot of cost, etc.

But there are still many disadvantages: (a) The input requirements for theoretical models are relatively high, and for many ship design software, it is difficult for users to obtain complete design information and geometric information of the entire hull surface; (b) the use of boundary-based The matching method of measured data and theoretical data has a large error

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