A topology-optimized design method for self-supporting structures for additive manufacturing

Abstract

The invention discloses a topology optimization design method for a self-supporting structure for additive manufacturing, which belongs to the related technical field of structure optimization design. The "four-unit method" is used to calculate and constrain the overhang angle α, and the overhang angle constraint is combined with the SIMP method. In combination, the method for obtaining the overhang structure that is a self-supporting structure in additive manufacturing can effectively suppress the appearance of overhang structures that need to be supported, avoid the addition of support structures, effectively reduce the consumption and cost of consumables, and improve the surface quality of the workpiece; The calculation method is completely applicable to the continuum structure, with high flexibility and wide application range.

Description

technical field [0001] The invention relates to a topology optimization design method of a self-supporting structure for additive manufacturing, and belongs to the technical field of structure optimization design. Background technique [0002] Topology optimization is an effective method to realize the lightweight design of workpiece structure. However, because the optimized workpiece is often complex in structure, most topology optimization is only used for the conceptual design of the structure, and it is difficult to carry out the later processing stage due to the limitation of traditional processing technology. In recent years, with the rise and development of additive manufacturing technology, domestic and foreign scholars and industrial designers generally believe that additive manufacturing technology has significant advantages such as strong ability to process complex components, short processing cycles, and no need for tooling and molds. Limited by the workpiece str...

AI Technical Summary

Problems solved by technology

However, there are still manufacturing constraints in the additive manufacturing process, among which the overhang structural constraints are the most serious

In additive manufacturing, the model is sliced ​​by software and printed layer by layer. In order to avoid printing collapse, it is required that there is enough material under each part of each layer after the model is sliced. If there is insufficient support material under the layer, it will form For overhanging structures, auxiliary supports must be artificially added to ensure successful printing. These supports are formed during processing and removed during post-processing, resulting in a serious waste of raw materials and time costs, and even damage the surface of the workpiece during removal.

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