Multi-material 3D printing method and micro-flow extrusion type printer based on multi-material 3D printing method

Abstract

The invention relates to a multi-material 3D printing method and a micro-flow extrusion type printer based on the multi-material 3D printing method. The method comprises the following steps that 1, an stl format file of a to-be-printed object is read, the stl format file is processed and sliced, path planning is conducted on a printing nozzle, path information is obtained, a moving step length is set, and material information is added to points on the path; 2, the printer reads the material information, the printing nozzle does idle stroke motion in the period when a blank runner is filled with a mixture, the printing nozzle is located at the starting point of the path when the idle stroke motion is finished, the printer continues to read the material information and starts to read the path information, and a printing task is started; and 3, after the material information is read, the printer does not read the material information any more and continues to read the path information until the mixture in a charging barrel is completely extruded out, and the printing nozzle completes the whole printing task. The method can eliminate the delay error generated in the process of filling the blank runner with the mixture, and the printer is suitable for a ceramic functionally graded material.

Description

technical field [0001] The invention belongs to the technical field of 3D printing, and specifically relates to a multi-material 3D printing method and a microflow extrusion printer based on the method, which are mainly used for 3D printing of ceramic functionally graded materials. Background technique [0002] Desktop-level 3D printers generally print by fusion deposition. Although the printer is small, light and cheap, the material used is too single. It can only print with a single material, that is, a single color, and it is difficult to print parts made of functionally graded materials. The ceramic slurry is a non-Newtonian fluid and has the property of "shear thinning". The viscosity without stirring is 285pa.s. It is difficult for ordinary 3D printers to extrude high-viscosity ceramic slurry. [0003] The existing 3D printing process is based on the principle of single-material printing. The material information read by the printer corresponds to the path information ...

AI Technical Summary

Problems solved by technology

Due to the stage of mixing materials and conveying materials from the barrel to the print nozzle in the multi-material printing process, there is a material delay phenomenon, which causes the path information of the print nozzle to produce an offset distance, resulting in a delay error in printing

figure 1 Schematic diagram of the position where the material composition changes for dual-material printing, where a represents the schematic diagram of the position where the material composition changes under ideal conditions, and b represents the schematic diagram of the position where the material composition changes in the actual situation; each point in the figure represents the position of the printed The path information of the nozzle, at the point (82.60), ideally, the color of the material at this point, that is, the composition changes, from red to blue, but because the printer has the stage of mixing materials and delivering the mixed materials to the printing nozzle, As a result, there is an offset distance in the process of extruding the material from the feeding mechanism to extruding from the printing nozzle, so that in the actual printing process, the composition change of the material composition that should have occurred at the point (82.60) is actually It is fully displayed at the point (108.70), and the print nozzle moves according to the ideal path information, resulting in printing deviation, and the material information and path information are not one-to-one correspondence.

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