题目：Investigation on Vibration Assisted Micro Machining Processes
报告人：Dr. Xiaoliang JIN
报告人简介：Xiaoliang JIN，男，博士，是美国机械工程师协会（ASME）和美国精密工程师协会（ASPE）会员。Dr. JIN博士毕业于加拿大英属哥伦比亚大学（University of British Columbia）机械制造专业，师从世界著名切削专家加拿大皇家科学院、工程院院士Yusuf Altintas教授。目前在美国俄克拉荷马州立大学（Oklahoma State University）任教。Dr. JIN长期从事切削工艺动力学机理研究，主要研究方向包括精密加工过程，微切削力学和动力学，振动辅助加工过程，精密机床设计，并在CIRP ANNALS、ASME JMSE、JMPT等国际知名期刊发表数篇论文。
(1) Fundamental mechanism of micro-cutting process with round tool edge effect is investigated. Mechanics and dynamics of micro-cutting are modeled based on the physics of the process. Cutting forces, tool vibrations and chatter stability of micro-milling process are predicted from material property and cutting conditions with experimental validation.
(2) Vibration assisted machining is a technique to apply high frequency vibration between tool and workpiece in addition to original cutting motion. Surface generation in the vibration assisted milling of BK-7 glass is experimentally investigated. The effects of vibration direction, vibration amplitude and frequency on the surface roughness and brittle-ductile transition of glass material is determined. Furthermore, the effect of vibration assistance on the chatter vibration amplitude in the micro-milling of Al-6061 is studied.
(3) The coupled axial-torsional vibration of micro drill plays a significant role in the vibration assisted micro drilling process. An efficient algorithm based on 2D finite element method is proposed to characterize the coupled axial-torsional dynamics of micro drill due to the warping effect. The effects of helix angle, aspect ratio and web thickness on the frequency response function of the micro drill are determined.