A three-dimensional shape detection method of weld bead based on surface structured light

Abstract

The invention proposes a weld pass three-dimensional shape detection method based on surface structured light, and belongs to the technical field of automatic manufacturing. The method comprises the steps: firstly constructing a structured light measuring system composed of a projector and a camera, arranging and fixing the projector, the camera and a to-be-tested weld pass sample, and calibratingthe projector and the camera; enabling the projector to adopt a three-steps phase shift method for projecting an image onto the to-be-tested surface of the to-be-tested weld pass sample, enabling thecamera to capture the image to obtain a corresponding camera image, calculating the world coordinates of all points of the camera image, and obtaining a point cloud of the to-be-tested weld pass sample; perform the effective sampling of the point cloud for many times to obtain the corresponding shape fitting equations, selecting the effective fitting equation from the shape fitting equations, removing the points belonging to the substrate part from the point cloud, forming the point cloud of the to-be-tested weld pass sample through the remaining points, and completing the detection of the three-dimensional shape of the to-be-tested weld pass sample. The method is simple, is low in cost, is comprehensive in measurement and is high in precision.

Description

technical field [0001] The invention proposes a three-dimensional shape detection method of a weld bead based on surface structured light, which can be applied in an additive manufacturing system and belongs to the technical field of automated manufacturing. Background technique [0002] Additive manufacturing is the process of obtaining data from a three-dimensional model, usually by stacking and stacking layers, and connecting materials to create objects. It has strong equipment versatility, simple process steps, short manufacturing cycle, complex parts can be manufactured, and material utilization rate High, low manufacturing costs and other advantages, suitable for small batches, flexible production mode of multiple varieties. The range of materials used in additive manufacturing is very wide, including polymers, metals, ceramics, sand, glass, biological materials, etc., among which the most commonly used materials are polymers and metals. Compared with traditional addi...

AI Technical Summary

Problems solved by technology

[0005] Therefore, the current shape detection technology mainly focuses on the processing of two-dimensional gray value images. The information contained in the image has limited dimensions and lacks depth values, so it cannot fully express three-dimensional information.

The processing of the formed weld bead and surface is limited to certain characteristic parameters, such as bead width, bead height, etc., which greatly limits the precise research on metal additive manufacturing process and parameters

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