Method for predicting surface roughness of additive manufacturing part

Abstract

The invention discloses a method for predicting the surface roughness of an additive manufacturing part, and belongs to the technical field of additive manufacturing. The prediction method for the surface roughness of the additive manufacturing part comprises the following steps of setting the placing angle and the slice layer thickness, obtaining the inclination angles of the upper surface and the lower surface of each inclination area of the part, and calculating theoretical values of the upper surface roughness and the lower surface roughness of each inclination area of the part through a mathematical model of the surface roughness; judging whether the surface roughness of the part meets the design requirement or not; if yes, manufacturing the part in an additive mode according to the current placing angle and the slice layer thickness, and if not, adjusting the placing angle or the slice layer thickness till the surface roughness of the part meets the design requirement, and manufacturing the part in an additive mode according to the current placing angle and the slice layer thickness. According to the prediction method for the surface roughness of the additive manufacturing part, the roughness of the part under different placement angles and different slice layer thicknesses can be predicted, process guidance is provided for SLM forming, the workload is reduced, and the working efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of additive manufacturing, in particular to a method for predicting the surface roughness of additively manufactured parts. Background technique [0002] Additive Manufacturing (AM) is based on the discrete-accumulation principle, using layered slicing software to slice the part model layeredly, after data processing and numerical control system control, the powder is melted layer by layer, solidified and accumulated layer by layer, and finally completed Rapid prototyping of parts. Selective laser melting (SLM) technology, as a newly developed additive manufacturing technology, has received extensive attention in recent years because it can directly process powder into parts with complex shapes and high precision. Such as figure 1 As shown, in the selective laser melting process, under the protection of an inert atmosphere, the computer-controlled laser is used to selectively scan the powder bed, thereby s...

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Problems solved by technology

In addition, the larger the overhanging part is, the more laser energy is directly irradiated on the powder bed. Due to the relatively poor thermal conductivity of the powder, the heat in the molten pool cannot be transferred to the surroundings in time, resulting in a longer time in the liquid phase state of the molten pool, which is prone to Overhangs increase the roughness of the lower surface and affect the forming accuracy

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