12月21日上午10点，在吕琳老师的主持下，香港中文大学的王昌凌教授在山东大学计算机学院为我们带来了题目为“Geometric Computing for Multi-Axis Additive Manufacturing”的精彩报告。
报告主要介绍了王昌凌教授团队从2015年开始到现在在3D打印方面的工作。3D打印面临着打印目标有部分悬空(Overhang)的问题，目前常见的解决方法是使用支撑，然而这会造成支撑材料难以移除、破坏打印物体的表面、浪费材料等很多问题。虽然材料打印的方法能够使用可溶解性支撑材料，但多材料会造成结合处性质完全无法控制的问题，从而带来更大的麻烦。所以王昌凌教授团队提出了一种基于单材料的，使用物体本身的结构来做支撑的方法。
他们首先研究了通过修改模型结构的方式来让模型变得能够自支撑，例如，让恐龙抬起脑袋，怪兽抬起手臂等等。但是，人们往往不希望为了进行3D打印而改变模型。为了在保持原来模型的同时不使用支撑，王教授的团队又提出了一系列通过旋转来进行3D打印的方法。他们提出了基于物体分解的方法，使得每一组件都可以不需要支撑就能打印出来。从用电机进行离散的旋转开始，到使用连续的旋转，他们解决了使用2.5D方式来进行多方向打印的问题。
2.5D的打印一方面只能使有限的模型能够不需要支撑地打印，另一方面也造成结构强度不够。所以，王教授团队又进一步研究了Multi-Axis的打印方法，通过5DOF不断降维(Volume-to-Surface and Surface-to-Curve)以及通过inverse peeling启发式的方式，实现了解决冲突并按分层方式进行的真正意义上的3D打印方法。最后，王昌凌教授还介绍了3D打印日渐增大的影响力和广阔的应用前景，为今天的报告画上了圆满的结束符。
讲者简介：Prof. Charlie C. L. Wang is a Fellow of American Society of Mechanical Engineers (ASME) with expertise in geometric computing, design and manufacturing. Before being re-appointed back to the Chinese University of Hong Kong (CUHK) in July 2018, he worked as Professor and Chair of Advanced Manufacturing at Delft University of Technology, The Netherlands (2016-2018) and Professor (2015-2016) / Associate Professor (2009-2015) / Assistant Professor (2003-2009) of Mechanical and Automation Engineering at CUHK. He also holds a non-paid position as Professor of Advanced Manufacturing at TU Delft (2018-2023), and he was a visiting professor at University of Southern California (2011). Prof. Wang received a few awards from professional societies including the ASME CIE Excellence in Research Award (2016), the ASME CIE Young Engineer Award (2009), the Best Paper Awards of ASME CIE Conferences (twice in 2008 and 2001 respectively), the Prakash Krishnaswami CAPPD Best Paper Award of ASME CIE Conference (2011), and the NAMRI/SME Outstanding Paper Award (2013). He received his B.Eng. degree (1998) in mechatronics engineering from Huazhong University of Science and Technology and his M.Phil (2000) and Ph.D. (2002) degrees in mechanical engineering from Hong Kong University of Science and Technology (HKUST).
主页：http://www.mae.cuhk.edu.hk/~cwang/
文 / 陈 昕
编 / 潘志一
图 / 陆树梁 吴光楠
