Micro-structured surfaces are assuming an ever-increasing role since they define the ultimate performance of many industrial components and products. Surface micro-structures, when carefully designed, can alter the optical, biological, tribological, and thermal properties of the original surfaces. The bottleneck of applying this new technology to commercial products is manufacturing efficiency. This talk demonstrates one example of using a novel vibration-assisted machining method for fast creation of periodic micro/nano-gratings for structural coloration. When the tool vibration is coupled with a constant cutting velocity, periodic cusps can be generated due to the machining marks. The periodic vibration-induced ripples can be precisely controlled in terms of spacing by changing the nominal cutting velocity. These periodic ripples, whose wavelength is in the visible spectrum, can introduce iridescent colors. The device design, theoretical analysis, experimental results, and potential applications of the process will be covered in this talk to demonstrate structural coloration of metals by direct machining.
Dr. GUO Ping received his B.S. degree in Automotive Engineering from Tsinghua University in 2009. He received his Ph.D. degree in Mechanical Engineering under the advisory of Dr. Kornel F. Ehmann from Northwestern University in 2014. He then joined the Department of Mechanical and Automation Engineering at the Chinese University of Hong Kong as an assistant professor starting in August, 2014. His research interests center on the paradigm of micro-manufacturing, including surface texturing, process micro-mechanics, miniature machine tools, micro-additive manufacturing, etc.
Date(s) - 06/01/2017
1062 Bainer Classroom