Gradient gap structure modeling and slicing method and system based on three-dimensional section characteristics

Abstract

The invention discloses a gradient void structure modeling and slicing method and system based on three-dimensional section characteristics, and the method comprises the following steps: calculating the proportion of the number of projection points of section contours at different heights in an X axis and a Y axis according to a distance based on the three-dimensional discrete characteristics of a skin structure; on the basis of an interpolation function of gradient change, a three-dimensional periodic minimized curved surface is adopted to construct a filling model of a target skeleton, TMPS coordinates in each layer are transformed along the gradient of the skin surface, reconstruction and dynamic deletion are carried out after the filling model with the gradient is obtained, and a triangular patch set completely intersecting with a tangent plane is obtained; extracting a model section binary image at a specified height according to a slice position, gradually searching along the edges of the inner and outer contours, extracting a contour curve, and further obtaining a printed slice result; establishing a gradient TPMS filling model according to the curvature or strength change of the skeleton model contour, and reducing the weight according to pores; and the calculation efficiency is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of 3D printing model processing, and in particular relates to a gradient void structure modeling slicing method and system based on three-dimensional cross-sectional features. Background technique [0002] Human bone structure is complex and irregular, especially sparse bone, which is full of interconnected pores with complex shapes. In order to ensure the topological structure inside the bone scaffold, the spatial lattice is usually used as the pore-forming unit to establish the microstructure. After the porous lattice structure and the bone model are subjected to Boolean operations, the STL (stereolithography) model for additive manufacturing can be obtained. . Through a large number of experimental studies, it is found that the interior of the TPMS (triply periodic minimal surface) structure is a connected surface, and the porosity and specific surface area can be precisely designed, which is very useful...

AI Technical Summary

Problems solved by technology

In additive manufacturing, STL triangular mesh data is often used to record 3D models. To accurately express the skeleton model composed of TPMS, it often takes 10 6 -10 8 grid, which greatly increases the slicing time, making the actual forming process difficult to achieve

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