Method for curing and shaping slurry spray used for 3D printing

A 3D printing and materials technology, applied in the direction of additive processing, etc., can solve the problems of high impact force of powder, poor surface quality of parts, short life, etc., and achieve the effect of good parts performance, high production efficiency and time saving

Active Publication Date: 2015-10-07
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The 3D printing curing agent injection technology is a process that uses a nozzle to spray a binder or a free radical catalyst on the "ink" layer to cure and shape the "ink" layer. However, in the traditional 3D printing curing agent process, the thermal foam nozzle only It can spray water-soluble curing agent that can be evaporated. The nozzle has thermal stress and its life is short. In addition, it has a strong impact on the powder, which makes the surface quality of the printed parts poor.
At present, there are no relevant reports on the use of spray curing and setting methods in the 3D printing process.

Method used

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  • Method for curing and shaping slurry spray used for 3D printing

Examples

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Comparison scheme
Effect test

Embodiment 1

[0024] Implementation example 1: 3D printing the green body of stainless steel metal parts by spray curing and shaping method

[0025] 1) Mix organic monomer hydroxyethyl methacrylate, solvent toluene, and initiator dibenzoyl peroxide to prepare a mixed solution, add stainless steel metal powder with a particle size of 1um to the mixed solution under shearing and stirring, and prepare Form a stainless steel powder "ink" slurry with high solid phase and low viscosity;

[0026] 2) Printing of the front "ink" layer: the 3D printer prints the front "ink" layer of stainless steel powder according to the 2D contour section program diagram;

[0027] 3) Spray curing and shaping: The extrusion sprayer atomizes the liquid curing agent N,N-dimethylaniline into a particle size of 0.01% according to the mass ratio of the liquid curing agent N,N-dimethylaniline to the stainless steel powder layer to be cured mm of mist beads, the mist beads evenly fall into the surface of the "ink" layer t...

Embodiment 2

[0031] Implementation example 2: 3D printing alumina ceramic parts green body by spray curing shaping method

[0032] 1) Mix the organic monomer hydroxyethyl methacrylate, solvent toluene, and initiator dibenzoyl peroxide evenly to prepare a mixed solution, and add alumina ceramic powder with a particle size of 50um to the mixed solution under shearing and stirring, Preparation of alumina powder "ink" slurry with high solid phase and low viscosity;

[0033] 2) Printing of the front "ink" layer: the 3D printer prints out the front "ink" layer of alumina according to the 2D contour section program diagram;

[0034] 3) Spray curing and shaping: the squeeze sprayer atomizes the liquid curing agent polyetherimide into mist beads with a particle size of 1mm according to the mass ratio of the liquid curing agent polyetherimide to the alumina powder layer to be cured at 2%. The beads fall evenly on the surface of the "ink" layer, forming a solidified layer with a thickness of 200um, ...

Embodiment 3

[0038] Implementation example 3: 3D printing of NdFeB magnetic alloy parts by spray curing method

[0039] 1) Mix organic monomer hydroxyethyl methacrylate, solvent toluene, and initiator dibenzoyl peroxide to prepare a mixed solution, and add NdFeB magnetic alloy with a particle size of 25um to the mixed solution under shearing and stirring Powder, prepared into a high-solid low-viscosity alumina powder "ink" slurry;

[0040] 2) Printing of the front "ink" layer: the 3D printer prints the front "ink" layer of NdFeB powder according to the 2D contour section program diagram;

[0041] 3) Spray curing and shaping: The extrusion sprayer atomizes the liquid curing agent ethylenediamine into fog beads with a particle size of 0.5mm according to the mass ratio of the liquid curing agent ethylenediamine to the NdFeB powder layer to be cured, and the fog beads are uniform It has to fall into the surface of the "ink" layer to form a solidified layer with a thickness of 100um, and solid...

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Abstract

The invention provides a method for curing and shaping slurry spray used for 3D printing and belongs to the field of material preparation of advanced rapid manufacturing. The method is characterized by comprising the steps that first a 3D printer prints a front 'ink' layer according to a 2D contour cross section program graph with prepared 'ink' slurry; then, a sprayer atomizes liquid curing agent into tiny spray beads according to the mass ratio ranging from 0.01% to 2% between the liquid curing agent and powder to be cured, the spray beads fall into the surface of the 'ink' layer uniformly, a solidified layer with the thickness ranging from 1 um to 200 um is formed, and after the front 'ink' layer is cured and shaped, the 3D printer prints a rear 'ink' layer according to the 2D contour cross section program graph; finally, the printing is conducted repeatedly until a part blank is formed through printing. By means of the method, the problems that in the traditional curing agent jet technique, the curing agent is not jetted uniformly, the surface of the 'ink' layer is defective, the jetting time is too long and the parts are prone to 'collapse' are effectively solved, and it is facilitated to print complex parts of large dimensions more conveniently and more rapidly and promote the development of the 3D printing technique.

Description

technical field [0001] The invention relates to a method for spraying and solidifying slurry for 3D printing, which belongs to the field of material preparation in advanced rapid manufacturing. Background technique [0002] 3D printing technology is a kind of rapid prototyping technology. The basic forming process is to use layered slicing software to slice the model layeredly along the height direction of the workpiece model to obtain 2D contours of the cross-sections of each layer. After that, the 3D printer follows these 2D The contour cross-section layer deposits materials in layers to form a series of 2D cross-sectional thin surface layers, and then sprays the curing agent to bond the layers to each other, and then prints out the 3D workpiece entity. [0003] 3D printing curing agent injection technology is a process that uses nozzles to spray binders or free radical catalysts on the "ink" layer to cure and shape the "ink" layer. However, in the process of traditional 3...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/22B33Y30/00
Inventor 林涛任向远邵慧萍郑航张乐盛超宇赵磊
Owner UNIV OF SCI & TECH BEIJING
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