Study of separation force in constrained surface projection stereolithography
Study of separation force in constrained surface projection stereolithography
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DOI：
10.1108/rpj-12-2015-0188
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发表时间：
2017-01-01
影响因子：
3.9
通讯作者：
Feinerman, Alan
中科院分区：
文献类型：
--
作者：
Pan, Yayue;He, Haiyang;Feinerman, Alan
目的-最近，约束表面投影光固化成型（SL）技术正受到广泛关注，并已广泛应用于3D打印行业。在约束表面投影SL系统中，新固化的层与约束表面的分离是历史技术障碍。它极大地限制了可打印尺寸、工艺可靠性和打印速度。此外，过大的分离力会导致制造过程中的粘附失效，导致断裂的约束表面和零件缺陷。在此背景下，本文探讨了形成的分离力和各种因素，影响分离过程中的约束表面投影SL systems.Design/方法/途径-一个自下而上的投影SL试验台，集成了一个原位分离力测量单元，开发的实验研究。在各种制造工艺设置和约束表面条件下的分离力进行了原位测量。此外，考虑到液态树脂充填过程，建立了物理模型。实验进行调查的影响，制造工艺设置，约束的表面条件和打印的几何形状上的分离力。调查结果-分离力与分离速度呈线性增加。变形和氧抑制层附近的约束表面大大降低分离力。印刷面积，面积/周长比和印刷几何形状的多孔性的程度上确定分离力的综合影响。独创性/价值-本文研究了在约束表面SL过程中的分离力的影响因素。研究了阻氧层厚度、变形和透氧能力等表面约束条件对分离力的影响。此外，印刷层的几何因素，是确定分离力的显着已被确定和量化。对分离力的研究为以后约束曲面投影光凝过程的自适应控制研究奠定了基础。
Purpose - Recently, the constrained surface projection stereolithography (SL) technology is gaining wider attention and has been widely used in the 3D printing industry. In constrained surface projection SL systems, the separation of a newly cured layer from the constrained surface is a historical technical barrier. It greatly limits printable size, process reliability and print speed. Moreover, over-large separation force leads to adhesion failures in manufacturing processes, causing broken constrained surface and part defects. Against this background, this paper investigates the formation of separation forces and various factors that affect the separation process in constrained surface projection SL systems.Design/methodology/approach - A bottom-up projection SL testbed, integrated with an in-situ separation force measurement unit, is developed for experimental study. Separation forces under various manufacturing process settings and constrained surface conditions are measured in situ. Additionally, physical models are constructed by considering the liquid resin filling process. Experiments are conducted to investigate influences of manufacturing process settings, constrained surface condition and print geometry on separation forces.Findings - Separation forces increase linearly with the separation speed. The deformation and the oxygen inhibition layer near the constrained surface greatly reduce separation forces. The printing area, area/perimeter ratio and the degree of porousness of print geometries have a combined effect on determining separation forces.Originality/value - This paper studied factors that influence separation force in constrained surface SL processes. Constrained surface conditions including oxygen inhibition layer thickness, deformation and oxygen permeation capability were investigated, and their influences on separation forces were revealed. Moreover, geometric factors of printing layers that are significant on determining separation forces have been identified and quantified. This study on separation forces provides a solid base for future work on adaptive control of constrained surface projection SL processes.