Three-dimensional segmentation method and system for internal defects of complex lattice structure

Abstract

The invention relates to a three-dimensional segmentation method and system for internal defects of a complex lattice structure. The method comprises the following steps: acquiring a plurality of tomographic images of a component, wherein the components are of complex lattice structures; for the kth tomographic image, identifying the defects of the tomographic image by adopting a set gray averagemethod to obtain a defect graph for marking the defects; marking defects in the defect graph by adopting a marking rectangular frame; according to the position coordinates of the marked rectangular frame in the defect image, performing binarization segmentation on the image of the marked rectangular frame in the defect image to obtain a two-dimensional sequence image corresponding to the kth tomographic image, wherein the two-dimensional sequence image comprises segmented defects; and performing three-dimensional reconstruction on the two-dimensional sequence images corresponding to all the tomographic images according to the sequence of all the tomographic images by adopting a volume rendering method to obtain a three-dimensional segmented image comprising all defects. According to the method, three-dimensional segmentation can be carried out on the incomplete fusion defect in the complex lattice structure, and the segmentation accuracy is improved.

Description

technical field [0001] The invention relates to the field of defect segmentation, in particular to a three-dimensional segmentation method and system for internal defects of complex lattice structures. Background technique [0002] With the increasing need for energy saving, the need for lightweight components increases, and in aerospace, the reduction in component weight results in lower fuel consumption and usage. In the automotive industry, a 10% reduction in component weight can reduce fuel consumption by 6-8%, and lattice structures are a better way to achieve these goals. The complex lattice structure of 3D printing is a new type of porous material with periodic arrangement. It has the characteristics of small bulk density, large specific surface area, and high specific mechanical properties. It is currently widely used in aerospace, petrochemical, and metallurgy. Due to the high design freedom and speed of additive manufacturing technology (3D printing), it provides ...

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Problems solved by technology

Therefore, when typical micro-defects such as unfused / over-fused appear in the structure, the gray value of the defect does not change, but the two-dimensional and three-dimensional morphological features change; when there is a fracture defect in the structure, the gray value of the defect The same as the background gray level, the current research method based on gray value segmentation is not yet able to directly segment the defects of the lattice structure, let alone perform three-dimensional segmentation and extraction of defects

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