Shape prediction method of extrusion type 3D printing bio-ink extrusion filament

Abstract

The invention discloses a shape prediction method for extrusion type 3D printing bio-ink extrusion filaments, and the method comprises the following steps: S1, modeling bio-ink to be predicted, and determining and obtaining three material characteristic parameters for constructing a bio-ink model, namely the density rho b of the bio-ink, the surface tension coefficient sigma of the bio-ink and the viscosity mu b of the bio-ink; s2, performing modeling on the basis of an OpenFOAM extrusion type 3D printing process, the modeling being realized through three steps of constructing a geometric model of an extrusion type 3D printer extrusion device, dividing grids and determining boundary conditions in sequence; s3, performing numerical simulation solution on the model constructed in the step S2 by using a fluid volume method; and S4, performing post-processing on the simulation result by using ParaView, and drawing a boundary between the bio-ink and air at different moments to obtain a prediction result of the shape of the extruded filament of the bio-ink. The method is high in prediction result precision, has higher consistency compared with an actual result, and is reasonable and effective.

Description

technical field [0001] The invention relates to the technical process analysis field of bio-ink in extrusion 3D printing, in particular to a shape prediction method of extrusion-type 3D printing bio-ink extrusion filaments. Background technique [0002] Bioink refers to a mixture gel containing biological components or biomaterials. In recent years, as a representative of bio-ink, cellulose bio-ink is prepared from plant components. It has the advantages of low price, non-toxic and harmless, sustainable, sufficient source and good mechanical properties. It has become widely used in medical and industrial fields. The application of green materials has attracted great attention in the research of material preparation and printing process of bio-ink. Extrusion 3D printing technology is to use the piston to squeeze the bio-ink in the needle tube at room temperature to extrude the extruded filaments formed in the air through the nozzles, and move the nozzles through the three-ax...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a solution to the lack of a complete extrusion method that solves the difficulty of predicting the shape of bio-ink extrusion filaments due to the numerous factors that affect the shape of bio-ink extrusion filaments and the dynamic prediction requirements. 3D Printing Bioink Extruded Filament Shape Prediction Method Problems Extrusion 3D Printing Bioink Extruded Filament Shape Prediction Method

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