A review on the erosion mechanisms in
abrasive waterjet micromachining of brittle
As an advanced manufacturing technology with distinct advantages over the other technologies on various aspects, ultrahigh pressure abrasive waterjet (AWJ) has been increasingly used by industry for processing various materials. The research group at the University of New South Wales (UNSW) in Australia has been developing this technology and explore the associated sciences for over 20 years. A recently published bibliometric analysis of abrasive water jet machining research has identified the UNSW group as the most influential and active group in the world in this subject area. Since 2000, this group has been taking a new avenue to develop micro AWJ technologies to meet the need of industry in the fabrication of miniature structures with high-integrity surface quality. This effort is motivated by the fact that the materials used to construct miniature structures are often difficult-to-machine and many readily available technologies either cannot realise the necessary precision or are costly. As a result, damage-free fabrication of micro structures at commercially viable cost has been claimed as one of the most cutting-edge technologies in the 21st Century. This review summarises some of the work that has been undertaken at UNSW on the development of an AWJ micro-machining technology, focusing on the system design currently employed to generate a micro abrasive jet, the erosion mechanisms associated with the processing of some typical brittle materials of both single- and two-phases, and the processing models developed for mathematically and quantitatively estimating the process performance measures. The review concludes on the viability of the technology and the prevailing trend in its development.
Prof. Jun Wang
received a bachelor’s degree from Dalian University of Technology in 1982 and a PhD from the University of Melbourne in 1993. He then worked at the University of Melbourne as a Research Fellow before moving to Queensland University of Technology in 1995 and then to UNSW in 2005. His current research interests include multi-length scale machining and fabrication using impacting particles and high energy beams, advanced cutting tools and cutting tool materials, engineering tribology and 3D printing. He has had some 500 publications, including more than 350 refereed journal articles. Wang has served as the Chairman of the International Committee for Abrasive Technology (2011-2015) and the founding Editor-in-Chief of the International Journal of Abrasive Technology, in addition to his past and present roles in four other international journals as an editor and further ten journals as a member of the editorial board. He has also served on a number of other professional positions, including Chairman/Co-chairman for 24 international academic conferences, the President of the Ausinan Science and Technology Society (2013-2015), and the Mechanical College Board of the Institution of Engineers Australia (2013-2015). He currently serves on a number of positions for government, academic, industry and professional organisations in Australia, China, USA, Japan and Malaysia, notably the Expert Consulting Committee for the Chinese Government, and the Chairman of the Academic Committee for the National Centre for International Research on Special Purpose Equipment and Advanced Manufacturing Technology of the Ministry of Science and Technology of China. Wang is a Fellow of the Institution of Engineers Australia and a Fellow of the International Society of Nano-manufacturing.
Dr Thai Nguyen received a BE (First Class Honours) from the University of Technology, Sydney in 1999 and a PhD from The University of Sydney in 2005. He is now a Research Fellow at UNSW Sydney. He has been awarded an Australian Postdoctoral Fellowship and was a Chief Investigator of two Australian Research Council Discovery-Projects grants. His research is to develop new technologies for precision machining, and to provide insight into the complex interactions of fluid dynamics, thermal cycling and mechanical deformation in the integrity and microstructure changes of the machined surfaces. He has published more than 50 peer-reviewed articles with more than 850 citations and an h-index of 17.