A high-precision global vision measurement method for three-dimensional thin-walled structural welds

Abstract

The invention relates to a high-precision global visual measurement method for three-dimensional thin-walled structural welds, including (1) preparation of workpieces and measurement systems; (2) measurement system calibration and parameter optimization; (3) measurement of space curve welds; (4) ) data splicing and weld seam extraction; (5) splicing skin blanking; (6) robot welding trajectory calibration. The invention’s innovative measurement field for three-dimensional contour welds realizes the on-site automatic measurement of the three-dimensional contours of the actual space curve welds, and identifies and extracts the position of the welds and the contour features of the welds, based on which the robot can be realized Weld track calibration during off-line programming, and accurate blanking of skin during weld assembly can be realized.

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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