Additive manufacturing self-supporting structure topological optimization method suitable for variable critical angle

Abstract

The invention discloses an additive manufacturing self-supporting structure topological optimization method suitable for a variable critical angle. The method comprises the steps of 1, pretreatment, wherein a structure geometric model and a discrete design domain are defined, boundary conditions are added, design variables are initialized, and optimization parameters are set; 2, topological optimization of the self-supporting structure: constructing an additive manufacturing self-supporting structure topological optimization mathematical model adaptive to a variable critical angle, and solving to obtain an optimal layout of the unit density of a design domain; and 3, post-processing: setting a unit size, and extracting a density contour surface to obtain an optimal self-supporting structure design scheme. A four-node rectangular unit discrete structure design domain with the variable length-width ratio is adopted, a self-supporting unit filtering method with the variable critical angle is constructed based on the design domain, an additive manufacturing self-supporting structure topological optimization method with the variable critical angle is established, optimization design adapts to a self-supporting structure with the variable critical angle, no support is achieved in the printing process, and printing materials and time are saved.

Description

technical field [0001] The invention belongs to the related field of structural optimization design, and in particular relates to a method for topology optimization of a self-supporting structure adapted to additive manufacturing with a variable critical angle. Background technique [0002] In recent years, additive manufacturing technology has developed rapidly due to its outstanding advantages of being able to manufacture complex structures, providing a powerful tool for structural preparation and broadening the space for structural design. However, there are some process constraints in additive manufacturing, especially when forming overhanging features, it is often necessary to add supports below them, and then manually remove them after printing, which greatly wastes printing materials and time, and also affects the performance and surface quality of parts. caused damage. [0003] In response to this problem, some scholars have begun to study the topology optimization ...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a topology optimization method for additive manufacturing self-supporting structures with variable critical angles, which realizes the optimal design of self-supporting structures with variable critical angles, saves printing materials and time, and solves the problem of traditional topology optimization structures. Issues requiring support during printing

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