Topological optimization design method of self-supporting structure in additive manufacturing

Abstract

The invention discloses a topological optimization design method of a self-supporting structure in additive manufacturing and aims at solving the technical problem of low practicability of the topological optimization design method of an existing self-supporting structure. The design method is characterized in that a certain number of closed polygonal holes are formed in a physical design area, and the topological layout evolution of the structure is driven by actions, such as movement, deformation, fusion, reduction, expansion and the like, of the holes. Furthermore, relative positions among apexes of all polygons are controlled, so that the inclined angle of the suspended portion of the overall structure is larger than the critical angle value, and accordingly self-supporting of the structure is achieved. Compares with a design method of the background technology, the topological optimization design method sacrifices less flexibility for achieving self-supporting of the structure. Furthermore, design variables are independent of units, small in number, little in calculation amount and easy to convergence. In addition, the designed structure boundaries are smooth, no intermediate density unit exists inside, and the design method is beneficial to later processing processes such as model reconstruction conducted by engineering designers and is high in practicability.

Description

technical field [0001] The invention relates to a topology optimization design method of a self-supporting structure, in particular to a topology optimization design method of a self-supporting structure in additive manufacturing. Background technique [0002] Since additive manufacturing uses cross-sections to build objects layer by layer, for some suspended parts in the model, common types of printing equipment such as fused deposition, photocuring, digital light processing, and laser selective melting require Additional supports are added under these parts to prevent deformation and collapse of the structure, and these supports are removed after printing to obtain the final structure. The presence of these supports not only causes waste of raw materials and increases manufacturing costs, but also the post-processing process to remove the supports reduces the surface finish of the structure and increases the manufacturing time. Therefore, it is of great engineering applic...

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Problems solved by technology

[0005] In order to overcome the shortcomings of poor practicability of the existing topology optimization design method for self-supporting structures, the present invention provides a topology optimization design method for self-supporting structures in additive manufacturing

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