Seminar on Magnetically Driven Internal Finishing, Strengthening and Measurement of Metallic Tubes

24 Aug 2026 10.30 AM - 11.30 AM MAE Meeting Room D (Blk N3.2-02-59) Current Students, Public

Assistant Professor Zhang Jiong

City University of Hong Kong (CityU)

This seminar will be chaired by Prof Li Hua.

Seminar Abstract

Metallic tubes are widely used in high-end engineering applications, including aerospace systems, nuclear energy equipment and precision moulds. The integrity of their internal surfaces directly affects component performance and service life. However, geometrical constraints such as narrow passages, curved channels and varying cross-sections make many internal surfaces difficult to access with conventional processing and measurement tools, posing major challenges for surface finishing, strengthening and measurement. To address these challenges, the speaker developed a magnetically driven approach in which an external magnetic field remotely drives and controls a magnetic tool inside the tube. Based on this principle, three technologies have been developed: Magnetically Driven Internal Finishing (MDIF), Magnetically Driven Impact Treatment (MDIT), and Magnetically Driven Internal Measurement (MDIM). This seminar will focus on the design, fabrication and motion control of magnetic tools, as well as the working principles and underlying mechanisms through which different magnetic tools enable internal surface finishing, impact-induced strengthening and surface measurement. These studies offer new approaches to ensuring the quality and performance of critical internal surfaces in high-end engineering components.

Speaker's Biography 

Dr. Zhang is an Assistant Professor in the Department of Mechanical Engineering at City University of Hong Kong (CityU). Prior to joining CityU, he was a Research Fellow in the Department of Mechanical Engineering at the National University of Singapore, where he also obtained his PhD degree. His research focuses on advanced manufacturing, particularly internal surface finishing, internal surface engineering, and post-processing for additive manufacturing. His research achievements in precision engineering have been recognized by the Heidenhain Scholarship from the European Society for Precision Engineering and Nanotechnology (euspen) in 2018 and the Young Researcher Award from the Asian Society for Precision Engineering and Nanotechnology (ASPEN) in 2023.

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