ABSTRACT

Additive manufacturing has shown giant potential in advanced manufacturing industry. However, distortion of additive-manufactured parts may interrupt the printing process and decrease manufacturing precision, causing a significant waste of time and money. Distortion, a common problem in additive manufacturing, has not been sufficiently researched. In this study, we provide a comprehensive understanding of distortion in additive manufacturing based on assumption of constraining force. A quantitative model was established to illustrate inconsistent shrinkage during the additive process. A qualitative model was then built for showing the distortion caused by inconsistent shrinkage. It can be founded that inconsistent shrinkage accumulated during the additive process drives the final distortion of part. We concluded most influencing factors of distortion together, forming towards a comprehensive understanding of distortion in additive manufacturing. This study not only links micro melting-solidification process and macro structural mechanics in science, but also provides systematic solutions for decreasing the distortion in additive manufacturing for engineering.

摘要

增材制造在先进制造业中显示出巨大的潜力。然而，增材制造零件的变形可能会中断打印过程并降低制造精度，从而造成大量时间和金钱的浪费。失真是增材制造中的一个常见问题，尚未得到充分研究。在这项研究中，我们基于约束力的假设全面了解增材制造中的变形。建立了一个定量模型来说明添加剂过程中不一致的收缩。然后建立一个定性模型来显示由不一致收缩引起的变形。可以发现，在增材过程中积累的不一致收缩导致了零件的最终变形。我们总结了变形的大部分影响因素，形成了对增材制造变形的全面理解。该研究不仅在科学上将微观熔化-凝固过程与宏观结构力学联系起来，而且为减少工程增材制造中的变形提供了系统的解决方案。