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Embedded printing trace planning for aluminum droplets depositing on dissolvable supports with varying section

机译：嵌入式印刷迹线计划，用于将铝滴沉积在具有可变截面的可溶支撑上

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摘要

Droplet-based 3D printing is a promising method to manufacture thin-walled parts with high-quality cavity surfaces of a complex geometry by virtue of dissolvable supports. However, conventional equispaced droplet scanning strategies cannot be used for dissolvable support assisted droplet printing that involves more complex impingement conditions, particularly when the dissolvable supports possess varying sections. This paper investigates the printing strategies for aluminum droplets depositing on dissolvable support that possesses preset dimensions, inclined surfaces and corners. Experimental and numerical results show that: (1) printing orientation on the oblique surfaces of dissolvable supports significantly influences the formation of hole-defects; (2) the printing strategy for corners should be specially adjusted to minimize defects. Moreover, the droplet scanning spacings on the support surfaces with preset shape and dimensions are elaborately regulated according to four different cases. Finally, the fabrication experiments of aluminum horns are performed to further examine the formability of the established droplet scanning strategies. The density of the printed horn is measured to be ～98% using the standard Archimedes method, and the corresponding industrial CT scanning results also verify a porosity-free inner structure. The cavity surfaces of the horn are smooth without obvious defects, and the average surface roughness of the inner surface is ～Ra 4.2 μm (only 0.53% of the droplet diameter). These measurement results indicate that the proposed strategies can effectively eliminate hole-defects that are commonly seen in equispaced printing.
机译：基于液滴的3D打印是一种有前途的方法，该方法可通过可溶解的支撑物来制造具有复杂几何形状的高质量腔体表面的薄壁零件。然而，常规的等距液滴扫描策略不能用于涉及更复杂的撞击条件的可溶解的载体辅助的液滴印刷，特别是当可溶解的载体具有变化的截面时。本文研究了铝液滴沉积在具有预设尺寸，倾斜表面和拐角的可溶解支撑物上的印刷策略。实验和数值结果表明：（1）在可溶载体的倾斜表面上的印刷方向显着影响孔缺陷的形成; （2）角落的印刷策略应特别调整，以最大程度地减少缺陷。此外，根据四种不同情况精心地调节了具有预定形状和尺寸的支撑表面上的液滴扫描间隔。最后，进行铝角的制造实验以进一步检查已建立的液滴扫描策略的可成形性。使用标准阿基米德方法测得的印刷号角的密度约为98％，相应的工业CT扫描结果也证明了内部无孔隙。喇叭的内腔表面光滑，无明显缺陷，内表面的平均表面粗糙度约为Ra 4.2μm（仅为液滴直径的0.53％）。这些测量结果表明，所提出的策略可以有效消除等间距打印中常见的孔缺陷。

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  • 来源
    《Robotics and Computer-Integrated Manufacturing》 |2020年第6期|101898.1-101898.10|共10页
  • 作者

  • 作者单位

    School of Mechanical Engineering Northwestern Polytechnical University Xi'an 710072 PR China;

    College of Mechanical Engineering Chongqing University Chongqing 400044 PR China;

    Department of Mechanical Engineering College of Engineering Computer Science and Technology California State University Los Angeles 90032 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    3D printing; Printing trace; Collision conditions; Dissolvable support; Variable section;

    机译：3D打印印刷痕迹;碰撞条件;可溶解的支持;可变部分;

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