High-precision global vision measurement method for three-dimensional thin-wall structure weld joint

Abstract

The invention relates to a high-precision global vision measurement method for a three-dimensional thin-wall structure weld joint. The method comprises the following steps: (1) preparing a workpiece and a measurement system; (2) calibrating the measurement system and optimizing parameters; (3) measuring a space curve weld joint; (4) carrying out data splicing and welding seam extraction; (5) splicing a skin and blanking; and (6) calibrating a robot welding track. The method is innovatively applied to the field of measurement of the three-dimensional contour weld joint; on-site automatic measurement of the three-dimensional contour of the actual space curve weld joint is achieved, the weld joint position and the contour characteristics of the weld joint are recognized and extracted, on thisbasis, weld joint track calibration in the robot off-line programming process is achieved, and accurate discharging of the skin in the weld joint assembling process can be achieved.

Description

technical field [0001] The invention belongs to the technical field of mechanical engineering, and relates to a high-precision global vision measurement method for three-dimensional thin-walled structural welds. Background technique [0002] In the structure of large spacecraft, in order to ensure the heat dissipation of power devices or the temperature control of the manned airtight cabin, there are a large number of thin-walled thermal control components. Manned spacecraft, Tiangong series, high-power satellites and other spacecraft are all involved in the manufacture of such products question. As a new type of thermal control component, the heat pipe fluid pipe coupled plate radiator is arranged on the outside of the spacecraft in a circular, tapered or square shape, and each cylinder is composed of multiple units. In the heat control design, a structure composed of finned heat pipes and thin-walled skins is used to increase heat dissipation. The materials are all alumin...

AI Technical Summary

Problems solved by technology

[0003] In the manufacturing process of large and complex thin-walled welding structures in aerospace, heat pipes with fins are bent by hand, and the actual processing shape and position accuracy of the edge contour of the three-dimensional variable curvature region to be welded is difficult to control, resulting in the actual contour of the region to be welded and the design The contour of the area to be welded on the digital model has a large deviation, and the material is aluminum alloy, the surface is highly reflective, and the traditional visual non-contact measurement method is prone to data distortion or measurement deviation

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