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工程设计学报
Chinese Journal of Engineering Design  2019, Vol. 26 Issue (1): 110-115    DOI: 10.3785/j.issn.1006-754X.2019.01.015
    
Development of FDM 3D printer based on hybrid coordinate system
CAO Wen-yi1,2, CHEN Ji-min1,2, YUAN Yan-ping1,2, LIU Si-da1,2
1. Beijing Engineering Research Center of 3D Printing for Digital Medical Health, Beijing 100124, China;
2. Institute of Laser Engineering, Beijing University of Technology, Beijing 100124, China
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Abstract  

Traditional FDM(fused deposition molding)3D printer needs to set up auxiliary foothold structure when it prints inverted parts, and the foothold structure needs to be removed from the prints after printing, which will reduce the precision of prints. In order to solve the problem, a FDM 3D printer based on hybrid coordinate system was designed. The principle of motion in new FDM 3D printer was based on quasi-spherical coordinate system instead of Cartesian coordinate system. The rotational motion in X-Z plane and X-Y plane combined with the linear motion in Z-axis direction made up the motion in quasi-spherical coordinate system, to realize the unsupported 3D printing. The hardware and software design for control system of the FDM 3D printer based on hybrid coordinate system was introduced. Printing experiments were performed by using traditional FDM 3D printer and FDM 3D printer based on hybrid coordinate system. The comparison result showed that the FDM 3D printer based on hybrid coordinate system had higher printing accuracy under the same level of precision hardware configuration. The FDM 3D printer based on hybrid coordinate system has high innovation and low cost with independent intellectual property rights, and it has vast market prospect.

Key words： 3D printing      hybrid coordinate system      inverted printing      no foothold     
Received: 10 July 2018      Published: 28 February 2019
CLC:  TP23  
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Cite this article:

CAO Wen-yi, CHEN Ji-min, YUAN Yan-ping, LIU Si-da. Development of FDM 3D printer based on hybrid coordinate system. Chinese Journal of Engineering Design, 2019, 26(1): 110-115.

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https://www.zjujournals.com/gcsjxb/10.3785/j.issn.1006-754X.2019.01.015     OR     https://www.zjujournals.com/gcsjxb/Y2019/V26/I1/110


基于混合坐标系的FDM型3D打印机研制

传统FDM（fused deposition molding，熔融沉积成型）型3D打印机在打印倒体件的过程中需设置辅助支撑结构，打印完成后去除支撑结构，这会导致成型件的精度降低。为解决传统FDM型3D打印机存在的问题，设计了一种基于混合坐标系的FDM型3D打印机。将基于笛卡尔坐标系的运动方式转换为基于拟球坐标系的运动方式，由X-Z平面内的旋转运动、X-Y平面内的旋转运动和Z轴方向的直线运动组合成拟球坐标系内的运动，达到无支撑3D打印的目的。介绍了基于混合坐标系的FDM型3D打印机控制系统的硬件和软件设计。用传统FDM型和基于混合坐标系的FDM型3D打印机进行打印实验并作对比，结果表明在同等级精度硬件配置的情况下，基于混合坐标系的FDM型3D打印机可以实现更高的打印精度。基于混合坐标系的FDM型3D打印机创新性强、造价低，拥有自主知识产权，具有广阔的市场前景。


关键词： 3D打印,  混合坐标系,  倒体打印,  无支撑 

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