Three-period minimal curved surface variable density lattice structure design method for additive manufacturing

Abstract

The invention provides a three-period minimal curved surface variable density lattice structure design method for additive manufacturing. The method comprises the following steps: firstly, establishing an elastic structure finite element model based on an elastic structure static balance theory and a unit 'birth and death' technology, and designing a structure unit bearing capacity extraction method; then, obtaining structural unit bearing capacity vector data and structural finite element model unit node data through calculation, and giving a structural unit bearing capacity cloud chart; then, processing the bearing capacity data of the structural unit, including curved surface interpolation, spline interpolation and normalization, and combining the processed bearing capacity data of thestructural unit with a TPMS function; then, serving the porosity of the TPMS porous structure as an evaluation index of the variable density lattice structure, and achieving TPMS variable density curved surface modeling through a March cubes algorithm; and finally, performing Boolean operation on the TPMS variable-density curved surface model and the original structure model to realize curved surface sealing. According to the invention, the problems of unstable topological structure numerical value, low efficiency and the like in the traditional lattice structure design are solved.

Description

technical field [0001] The invention relates to the fields of computer-aided design and additive manufacturing, in particular to a method for designing a three-period minimal curved surface variable-density lattice structure for additive manufacturing. Background technique [0002] The lattice structure has excellent mechanical properties and is widely used in aerospace, automotive and biomedical fields. With the rapid development of additive manufacturing technology, the lightweight design, manufacture and application of lattice structures are developing rapidly. In the actual production process, each area of ​​the mechanical structure usually bears different loads, and the traditional lattice structure design is based on uniform size unit cells. This kind of equal-density lattice structure has the problem that the material properties cannot be fully utilized. [0003] In order to improve the utilization rate of materials, more materials can be allocated to areas with grea...

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Problems solved by technology

[0006] Aiming at the problems existing in the prior art, the present invention provides a three-period minimum surface variable density lattice structure design method for additive manufacturing, mainly to provide a new idea for structural lightweight design and solve the problem of traditional lattice structure design. In order to solve the problems of numerical instability and low efficiency in the topological structure, introduce the unit bearing capacity to guide the variable density change of the lattice material, introduce the three-period minimal surface as the lattice cell structure, and use the additive manufacturing technology as the manufacturing method to realize the structure Lightweight design of lattice structure

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