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Method for determining bulk modulus of ink in direct writing printing

A bulk modulus and ink technology, which is applied in manufacturing tools, processing data acquisition/processing, processing material handling, etc., can solve the problems of large material consumption and insufficient precision, and achieve the effect of material saving and high precision

Active Publication Date: 2022-06-24
BEIHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When using these two types of methods to determine the bulk modulus of ink in direct writing printing, there is a need to consume a large amount of materials, and the measurement results are related to the measurement device, resulting in the measured bulk modulus being used in the evaluation of the actual extrusion process of the ink. The problem of insufficient precision

Method used

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  • Method for determining bulk modulus of ink in direct writing printing
  • Method for determining bulk modulus of ink in direct writing printing
  • Method for determining bulk modulus of ink in direct writing printing

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Embodiment Construction

[0029] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but the following embodiments do not limit the present invention by any means.

[0030] like figure 1 As shown, the method of the present application is used to determine the bulk modulus of a certain cellulose bioink, and the specific implementation steps are as follows:

[0031] S1. Establish the flow model of ink in the needle tube and the flow model of ink in the nozzle;

[0032] Specifically, the specific implementation process of this step S1 is as follows:

[0033] Since the original intention of the design of this method is to propose a method for determining the bulk modulus of the ink during printing during the extrusion process of the ink in the direct writing printer, so as to realize that the determined value of the bulk modulus is highly consistent with the actual bulk modulus. Therefore, First, the extrusion process of the direct-w...

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Abstract

The invention discloses a method for determining the volume modulus of ink in direct writing printing, which comprises the following steps of: constructing a flow model of the ink in a needle tube and a flow model of the ink in a nozzle based on the structure of a direct writing printer and an ink extrusion process, and obtaining a volume modulus calculation formula of the ink according to the two flow models, respectively testing to obtain the density, yield stress and delay time of the ink; substituting the test result into a bulk modulus calculation formula to obtain the bulk modulus of the ink; according to the method, the extrusion process of the ink in the direct-writing printer is directly utilized, materials are saved, the bulk modulus of the ink in the actual extrusion process of direct-writing printing is visually and accurately reflected, and high precision is achieved.

Description

technical field [0001] The invention relates to the technical field of physical property parameter measurement of materials in additive manufacturing, in particular to a method for determining the bulk modulus of ink in direct writing printing. Background technique [0002] According to the additive manufacturing standard ISO / ASTM52900:2015 issued by the American Society for Testing and Materials (ASTM), additive manufacturing technology is divided into 7 categories: binder jetting technology, direct energy deposition technology, material extrusion technology, material jetting technology , powder bed melting technology, lamination technology and photopolymerization technology. Direct-writing printing belongs to the material extrusion technology in the additive manufacturing technology according to the principle. The ink is extruded from the nozzle into continuous filaments by piston or screw drive) or pneumatic force, and the filaments are stacked into three-dimensional par...

Claims

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Application Information

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IPC IPC(8): B29C64/118B29C64/343B29C64/386B29C64/393B33Y40/00B33Y50/00B33Y50/02
CPCB29C64/118B29C64/343B29C64/386B29C64/393B33Y40/00B33Y50/00B33Y50/02
Inventor 蔡庆中涂勇强杨功流李晶
Owner BEIHANG UNIV
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