A system and method for measuring and adjusting the shape of a numerically controlled three-dimensional plate bending machine

Abstract

The invention discloses a system and method for measuring and adjusting the shape of a numerical control three-dimensional plate bending machine, relating to the field of measuring and adjusting, including an active light projector group, an image acquisition device, a measuring bracket, an electric slide rail, a connecting plate, a control panel, and an industrial computer and a high-speed communication unit; the method is based on the optical measurement shape adjustment technology, projects a plurality of active light strips on the object to be measured by means of an active light projector group, collects images with light strips and analyzes theoretical data by processing an image acquisition device , extract measurement point cloud and theoretical point cloud; through resampling technology, digital-analog registration technology, and NURBS surface reconstruction of two point clouds, calculate each indenter group of CNC 3D plate bending machine during the forming process According to the forming deviation at the center, combined with the springback theory of curved plate cold forming, the shape of the CNC three-dimensional plate bending machine is adjusted. Compared with the traditional method for measuring and adjusting the shape of a sample box, the present invention has the advantages of high efficiency and precision of measuring and adjusting the shape, and improves the forming quality of the three-dimensional plate bending machine.

Description

technical field [0001] The invention relates to the fields of shipbuilding and measurement and shape adjustment, and in particular to a system and method for measurement and shape adjustment of a numerically controlled three-dimensional plate bending machine. Background technique [0002] CNC three-dimensional bending plate forming technology adopts multi-pressure head forming technology. Its principle is to discretize the traditional overall mold. The upper and lower molds are composed of many height-adjustable pressure heads, and the upper and lower molds can be adjusted Surfaces of any shape, thus turning the overall mold into a flexible mold with variable shape. [0003] When the CNC three-dimensional plate bending machine bends the plate, it needs to go through many times of "shape adjustment of the lower die, pressure of the upper die, and forming measurement", which can gradually compensate for the rebound of the plate and ensure the forming accuracy of the outer plat...

AI Technical Summary

Problems solved by technology

[0004] Although the CNC three-dimensional plate bending machine has realized mechanization and automation in the forming of curved plates, most shipyards in China still mainly use manual sample boxes to estimate the springback of formed curved plates when measuring and adjusting the shape, and then manually adjust Although the method of measuring and adjusting the shape of the sample box has a strong adaptability to complex production sites, it also has some obvious shortcomings: 1. The accuracy of measuring the shape is low, and the forming accuracy of the curved plate is difficult to guarantee

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

Therefore, manual sample box measurement and adjustment is not only labor-intensive, but also has low efficiency of measurement and adjustment; 3. Quantitative measurement and adjustment results cannot be formed

The process of measuring and adjusting the shape of the sample box is mainly judged by the experience of the workers. Quantitative forming error data cannot be obtained, and accurate measurement and adjustment data and evaluation standards cannot be provided. There is a lack of measurement and adjustment specifications.

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