Biological 3D printer and topography detection of printing model

doi:10.3785/j.issn.1008-973X.2021.02.009

Journal of ZheJiang University (Engineering Science)

2021, Vol. 55

Issue (2): 289-298 DOI: 10.3785/j.issn.1008-973X.2021.02.009

Biological 3D printer and topography detection of printing model

Da-peng BAI1(

),Bin ZHANG1,*(

),Hao-cen HONG1,Yang LI1,Qing-hua JI2,Hua-yong YANG1

1. State Key Laboratory of Fluid Power and Mechatronic Systems, School of Mechanical Engineering, Zhejiang University, Hangzhou 310027, China
2. Binhai Industrial Technology Research Institute of Zhejiang University, Tianjin 300450, China

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Abstract

An integrated biological 3D printer inspection system was designed in order to observe the printing process of 3D biological printer in real time as well as detect and reconstruct the surface topography of printing model. The online inspection of printing model was realized based on the printing needles with video monitoring. The dispersion confocal displacement measurement technology was adopted to measure the position information of X-axis and Y-axis and the height information of Z-axis. The topography reconstruction work of printing model was processed by MountainsMap. The upper computer operating system was developed by LabVIEW, in which the printing model was mapped with G-code to visualize printing track to ensure the accuracy of the printing model when the program runs to the current code segment. The online real-time detecting function of the proposed biological 3D printer was verified by experiments, and the surface topography detection of grid shaped and convex shaped models was conducted respectively. Results show that the surface topography information of printing model can be reconstructed by the detection system. The visualization data of the surface topography features of the printing model provides data support for the construction of accurate printing models, and the computer vision technology provides an effective detection method for high-precision biological 3D printing.

Key words： biological 3D printing model detection detection technology surface topography reconstruction visualization

Received: 08 August 2020 Published: 09 March 2021

CLC:

TH 122

Fund: 国家重点研发计划资助项目（2018YFA0703000）

Corresponding Authors: Bin ZHANG E-mail: bdp.2008@163.com;zbzju@163.com

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	Da-peng BAI
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	Hao-cen HONG
	Yang LI
	Qing-hua JI
	Hua-yong YANG

Cite this article:

Da-peng BAI,Bin ZHANG,Hao-cen HONG,Yang LI,Qing-hua JI,Hua-yong YANG. Biological 3D printer and topography detection of printing model. Journal of ZheJiang University (Engineering Science), 2021, 55(2): 289-298.

URL:

http://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2021.02.009 OR http://www.zjujournals.com/eng/Y2021/V55/I2/289

生物3D打印装置及打印模型形貌检测

为了能够实时观测生物3D打印全过程，并对打印模型的形貌进行检测及重建，设计集成式生物3D打印机检测系统. 通过开发具备视频监测功能的打印喷头，实现对打印模型的在线检测. 采用色散共焦位移测量技术，通过对打印模型X、Y轴的位置信息及Z轴的高度信息进行扫描得到测量数据，并结合MountainsMap实现打印模型的形貌重建. 使用LabVIEW完成上位机操作系统的设计，建立G-code与打印模型的映射关系，实现打印轨迹的可视化，确保在程序运行到当前代码段时打印模型的准确性. 通过实验验证生物3D打印机的在线检测功能，对网格状及凸台模型的表面进行形貌检测，结果表明检测系统能够实现对打印模型的形貌检测. 打印模型表面形貌特征的可视化数据为构建精准打印模型提供数据支持，计算机视觉技术为高精度生物3D打印提供有效的检测手段.

关键词： 生物3D打印, 模型检测, 检测技术, 形貌重建, 可视化

Fig.1 Structure of biological 3D printer

Fig.2 Motion system of biological 3D printer

Fig.3 Feeding system of biological 3D printer

Fig.4 Temperature control system of biological 3D printer

Fig.5 Structure of printing nozzle under low-temperature environment

Fig.6 Structure of printing nozzle under high-temperature environment

Fig.7 Structural schematic diagram of temperature control system of printing platform

Tab.1 Comparison of advantages and disadvantages of non-contact displacement transducer

Fig.8 Scheme of vision detection system

Fig.9 Control system of biological 3D printer

Fig.10 Schematic diagram of communication system

Fig.11 Schematic diagram of 3D data acquisition

Fig.12 Flowchart of scanner

Fig.13 Flowchart of data acquisition program

Fig.14 Upper computer operating system of biological 3D printer

Fig.15 Functional modules of biological 3D printer

Fig.16 Experimental procedure of vision detection test

Tab.2 Experimental conditions and parameters of printing

Fig.17 Monitoring software interface of biological 3D printer

Fig.18 Printing results of meshed stent

Fig.19 3D reconstruction model of meshed stent

Fig.20 Displacement nephogram of meshed stent

Fig.21 Structural cross-section of meshed stent

Fig.22 Sectional contour curve of meshed stent

Tab.3 Sectional height data of meshed stent

Tab.4 Displacement data of meshed stent

Fig.23 Printed convex structure

Fig.24 3D reconstruction model of convex structure

Fig.25 Displacement nephogram of convex structure

Fig.26 Structural cross-section of convex structure

Fig.27 Sectional contour curve of convex structure


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