Method for improving quality of inner surface of 3D printed part

Abstract

The invention provides a method for improving the quality of the inner surface of a 3D printed part. The method comprises the following steps that chemical plating is conducted on a printed part by utilizing a first material so as to deposit a first material layer on the surface of the printed part; and the printed part is placed into a vacuum furnace for heat treatment. According to the method, surface voids and tiny pits of the surface of the printed part with an internal groove structure can be filled with materials, the roughness of the inner surface and the outer surface of the printed part is reduced, and the surface quality of the inner surface and the outer surface of the printed part is improved; and in addition, due to the fact that the thickness of the first material layer usedfor coating a substrate of the printed part is smaller than 5 microns, the internal structure accuracy, the shape accuracy or the size accuracy of the printed part cannot be influenced.

Description

technical field [0001] The invention relates to 3D printing, in particular to a method for improving the inner surface quality of 3D printing parts. Background technique [0002] Now, additive manufacturing (Additive Manufacturing, AM), also known as 3D printing, has received more and more attention because of its rapid manufacturing based on CAD model sketches. 3D printing technology can manufacture parts with complex structures in a short period of time. Selected Laser Melting (SLM) process is a kind of additive manufacturing (Additive manufacturing) technology, mainly used for plastic and metal powder. Among them, selective laser melting uses a high-power laser to melt metal powder and build components / components layer by layer through 3D CAD input, which can successfully manufacture components with complex internal channels. [0003] Despite the great promise of 3D printing technology, the surface quality of its printed parts, such as surface roughness and blemishes, i...

AI Technical Summary

Problems solved by technology

However, the etching rate of electrolytic polishing is greatly affected by the complex electric field defined by the shape of the print, not to mention the possible degradation effects of the etching process (deterioration effects)

Similarly, the grinding speed of abrasive jet polishing will also be greatly affected by the fluid dynamics of the complex internal grooves of the printed part, so it is difficult to control the accuracy without affecting the shape of the internal structure

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