Method for detecting surface roughness of internal rods in 3D printed lattice structure
A technology of surface roughness and lattice structure, which is applied in computer components, measuring devices, image enhancement, etc., can solve problems such as the inability to measure the surface roughness of rods, the inability of optical interferometers to measure reflections, and measurement errors. To achieve the effect of overcoming the roughness of the internal surface
Active Publication Date: 2021-02-26
江苏航浦国创复材研究院有限公司
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However, when the surface quality of the workpiece rod is poor, the optical interferometer cannot measure the reflection correctly, which will lead to large errors in the measurement; in addition, the method of measuring based on optics is not suitable for rough SLM additive parts, and Only the outer surface can be measured, and the surface roughness of the internal lattice structure cannot be measured
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[0037] In this embodiment, the topological structure of the three-dimensional lattice unit of the three-dimensional printing lattice lattice structure is as follows figure 1 shown. A three-dimensional lattice unit includes a node and 8 rods, and the 8 rods are divided into upper and lower parts with the node as the boundary, so it is a centrosymmetric topological structure.
[0038] The method for detecting the surface roughness of the internal rod of the three-dimensional printing lattice structure in this embodiment includes the following steps:
[0039] Step 1. Carry out CT scanning (preferably scanning by cone beam MicroCT) on the sample of the lattice lattice structure to obtain multiple frames of the first image. During scanning, the scanning section of CT is parallel to the printing reference plane of the 3D printer; select each The area of the preset size and position in the first image of the frame is used as the second image, and the second image contains a plural...
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The invention relates to a method for detecting the surface roughness of internal rods of a three-dimensional printing lattice structure, comprising the following steps: performing CT scanning on a sample of a lattice structure, and finding out all the rods in each slice image The boundary contour of the member; then find out the boundary contour of the rod in each slice image corresponding to one of the rods, and divide the boundary contour of the rod into upper and lower surface contours according to the corner points; finally establish the lattice lattice structure The surface roughness mathematical model calculates the overall surface roughness value of a single rod with a lattice structure. The invention can measure the surface roughness of the rods inside the complex lattice structure without destroying the lattice structure.
Description
technical field [0001] The invention relates to a method for detecting the surface roughness of internal rods in a three-dimensional printing lattice lattice structure, and belongs to the technical field of surface roughness detection. Background technique [0002] Lattice materials are divided into two-dimensional lattice structure and three-dimensional lattice structure (also called lattice lattice structure) according to the form of lattice structure. The three-dimensional lattice structure is composed of geometric structures such as nodes and rods according to certain rules. The materials arranged according to a certain periodic rule have strong ability to resist impact, absorb energy and vibration, and have been used in the aerospace field, with great application potential. In recent years, the continuous development of additive manufacturing technology has provided great convenience for the preparation of three-dimensional lattice structures. [0003] At present, the ...
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IPC IPC(8): G01B15/08G06T7/00G06K9/46
CPCG01B15/08G06T7/0004G06T2207/10028G06T2207/10081G06V10/44
Inventor 戴宁项磊苏仕祥
Owner 江苏航浦国创复材研究院有限公司