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3D printing method and printing device for extrusion molding

A 3D printing and extrusion molding technology, applied in the field of 3D printing, can solve the problems of inability to print macro-aperture, limit the degree of freedom of printing functions, and have a large impact on the gravity of the printing line, so as to improve the narrowing of the printing line path and the improvement of the meniscus. Problems, the overall function is convenient and reliable, and the effect of increasing the size of the macro aperture

Active Publication Date: 2019-01-29
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] 3D printing, especially the 3D printing method of extrusion, is greatly affected by the gravity of the printing line, the printed grid is prone to shape defects such as narrow path and meniscus, and the grid with a large span between lines is difficult to form.
This leads to the inability to print grids with large macroscopic aperture and high porosity, which limits the functional freedom of printing, especially the printing of sparse grids and filled multi-material grids

Method used

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  • 3D printing method and printing device for extrusion molding
  • 3D printing method and printing device for extrusion molding
  • 3D printing method and printing device for extrusion molding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Based on low temperature deposition 3D printing (FT-FDM), the actual printing process of the nozzle is as follows:

[0062] Such as figure 2 As shown, the printing device includes a coaxial nozzle 201, a nozzle temperature control device 202, and a printing platform 203 in a cold environment. Among them, the material A loaded in the inner channel of the coaxial nozzle can be a solution of polymer printing materials such as PLGA and PCL in organic solvents such as 1,4-dioxane and acetone; An organic solvent that is the same but does not contain polymeric materials.

[0063] The composite material extruded through the coaxial nozzle 201 is provided with thermal insulation and heating by the nozzle temperature control device 202 before extrusion to avoid premature solidification. When the material is extruded on the printing platform 203 , since the printing platform 203 is placed in a cold environment, the composite material can be rapidly solidified by the low tempera...

Embodiment 2

[0066] The invention is applied to a cell 3D printer in the field of biological 3D printing. The printer can realize the printing of hydrogel with cells, and usually adopts a physical-chemical two-step cross-linking method to achieve curing, that is, the initial shape of the printed product is achieved through temperature control during printing, and a chemical cross-linking agent is added dropwise after printing to improve the product quality. mechanical strength. In a preferred embodiment, gelatin is used for preliminary setting, and sodium alginate-calcium chloride system is used for chemical crosslinking.

[0067] Applying the present invention, the coaxial nozzle is used for printing, the gelatin-sodium alginate composite gel is printed in the inner flow channel, and the gelatin is printed in the outer flow channel. Afterwards, chemical crosslinking is carried out to improve the mechanical strength of the composite gel, and the outer layer of gelatin is peeled off by tem...

Embodiment 3

[0069] The invention is applied to common fused deposition printing such as plastic printing, raw materials for inner channel printing, wax for outer channel printing and other sacrificial materials with lower melting point and better fluidity after melting. It can play a certain supporting role in the printing line shape, and can be easily removed by micro-heating after printing.

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Abstract

The invention provides an extrusion molding 3D printing method and device. A coaxial spray nozzle or an abreast spray nozzle is used. A printing material is extruded through an inner flow channel of the coaxial spray nozzle or a main flow channel of the abreast spray nozzle. A sacrifice material flows out from an outer flow channel of the coaxial spray nozzle or an auxiliary flow channel of the abreast spray nozzle, has the viscosity lower than that of the printing material, and can fully flow. When the printing material is subjected to scanning printing along preset printing paths, gaps between the printing paths are filled with the sacrifice material which has a supporting effect. After the printing material and the sacrifice material are jointly solidified, the sacrifice material is removed through aftertreatment, and only the printing material is left. The extrusion molding 3D printing method is simple and easy, requirements for printing conditions and the printer design are low, and extrusion molding with the macroscopic hole diameter and linear defects can be improved.

Description

technical field [0001] The invention relates to 3D printing, in particular to an extrusion molding 3D printing method and printing device. Background technique [0002] 3D printing is the main form of "additive manufacturing". The concept of "additive manufacturing" is different from traditional "removal" manufacturing. Additive manufacturing technology is a technology that uses computer design data to manufacture entities by layer-by-layer accumulation of materials. [0003] There are many different technologies for 3D printing, including fused deposition, electron beam forming, laser sintering, laser melting, and stereolithography. Among them, extrusion molding based on physical or chemical curing is a simple and widely used process. However, most of the printed products have a structure in the form of a cross grid. This structure is affected by gravity when the grid direction is changed (such as horizontal and vertical printing alternately), which is prone to shape def...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C64/209B29C64/118B33Y30/00
CPCB33Y30/00
Inventor 弥胜利孙伟徐圆圆郭潇
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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