Droplet jetting 3D printing length dimension prediction method

A technology of droplet jetting and 3D printing, which is applied in manufacturing auxiliary devices, processing data acquisition/processing, additive processing, etc., and can solve the problem that the size of droplet jetting 3D printing cannot be measured online

Active Publication Date: 2018-08-17
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the size of droplet jetting 3D printing cannot be measured online, the present invention provides a method for predicting the length and size of droplet jetting 3D printing, which is used to predict the printed length of the current layer online

Method used

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  • Droplet jetting 3D printing length dimension prediction method
  • Droplet jetting 3D printing length dimension prediction method
  • Droplet jetting 3D printing length dimension prediction method

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Experimental program
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Effect test

Embodiment 1

[0026] Use Flow 3D simulation software to simulate the process of printing a straight line. In the simulation, the initial temperature of the printing fluid material is set to 363K, and the initial temperature of the air and the printed layer material (or substrate) is 293K. The vertical distance of droplet falling is h=1.7mm, and the printing frequency f=70Hz.

[0027] Firstly, a single droplet ejection and solidification simulation is carried out, so that the single droplet is at the initial horizontal velocity u x =0.03m / s Spray onto the substrate to solidify and form until it is completely solidified (t=0.33s). The simulation results are processed by post-processing software, and the diameter of a single droplet after solidification is D=420um.

[0028] To further study the situation of printing straight lines, in order not to lose generality, the parameters that have been set when printing a single droplet are not changed, but considering the influence of nozzle movement...

Embodiment 2

[0032] The actual printing is carried out according to the three steps described in the specific implementation method, and the low-melting-point tin-bismuth alloy material is selected, and the melting point is 65 degrees Celsius. Firstly, the dropletability test printing of the molten liquid is carried out with the printing vertical distance h=2mm, and the diameter of a single droplet after solidification is measured D=490um, and the initial velocity in the vertical direction of the droplet when it leaves the nozzle is u y = 1 m / s (acquire the speed with a high-speed camera). Then keep at the level of the vertical distance, keep the pressure, material temperature and other parameters during the trial printing unchanged, and control the nozzle at the initial speed u x =0.003m / s, acceleration a=0.001m / s 2 Do horizontal linear motion, at the same time, set the printing frequency f=7Hz and start printing 8 drops continuously, the result is as follows Figure 4 shown. Measured ...

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Abstract

The invention provides a droplet jetting 3D printing length dimension prediction method. The method comprises the steps of firstly, carrying out a droppable jetting experiment by adjusting printing technological parameters, guaranteeing that a printing material can be jetted out continuously in a single droplet form to obtain droplets with the expected size and measuring the diameter of the solidified single droplet; secondly, inputting parameters including the droplet jetting frequency, the movement speed and acceleration of nozzles and the height of the nozzles from a printing interface through related printing control software; and finally, substituting the parameters into a calculation model provided by the invention and calculating the contour length dimensions of a current printed layer in real time. The droplet jetting 3D printing length dimension prediction method can provide a prediction model and a reference for droplet jetting 3D printing length control.

Description

technical field [0001] The present invention relates to an online estimating method for 3D printing length and size, in particular to a method for predicting the length and size of droplet jetting 3D printing, which is used for online prediction of the length of the printed linear outline of the current layer during the droplet jetting 3D printing process. Background technique [0002] Droplet jetting 3D printing is an emerging rapid prototyping technology, which sprays fluid-like printing materials from nozzles in the form of uniform droplets in a controlled manner at high frequency and continuously, and constructs entities layer by layer according to the design trajectory. With the advantages of wide material selection, relatively low cost, and convenient operation, it has become one of the mainstream technologies in the field of 3D printing. [0003] However, it is currently difficult to control the shape accuracy of droplet jet 3D printing. In occasions where high precis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C64/386B29C64/393B33Y50/00B33Y50/02
CPCB29C64/386B29C64/393B33Y50/00B33Y50/02
Inventor 陈从平吕添胡琼何枝蔚邓扬
Owner CHINA THREE GORGES UNIV
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