東京農工大学 大学院工学研究院先端機械システム部門 夏研究室 東京農工大学 大学院工学研究院先端機械システム部門 夏研究室


The research interest in our laboratory is mainly focused on manufacturing, especially on non-traditional machining technologies. The research topics are related with the electro-chemical machining (ECM) and electrical discharge machining (EDM) technologies for micro metallic parts no matter how hard they arse, and the polishing technology for precise molds used for mass-production of aspheric lenses.

Biography of Dr. Natsu

Dr. Wataru Natsu is currently a distinguished professor working in the Department of Mechanical Systems Engineering and the Department of Industrial Technology and Innovation, Tokyo University of Agriculture and Technology (TUAT). Dr. Natsu obtained his bachelor degree and master degree in Mechanical Engineering from Shanghai Jiao Tong University (SJTU), respectively in 1982 and 1987. He had served as a lecturer during December, 1988 and October, 1990 in SJTU. After obtaining his doctor degree in Mechanical Systems Engineering from TUAT in 1995, He had worked as a chief engineer, and then the deputy chief in the R&D division in Kuroda Precision Industries Ltd., a precision equipment manufacturer, for 7 years. Dr. Natsu’s research and teaching interests are in manufacturing and machining, shape measurement of semiconductor wafers, and management of technology (MOT).


  • Dr. Eng., 3/1995, Mechanical Systems Engineering, Tokyo University of Agriculture and Technology (TUAT)
  • M.S., 1/1987, Mechanical Engineering, Shanghai Jiao Tong University (SJTU)
  • B.S., 7/1982, Mechanical Engineering, SJTU

Work History

  • 7/2016-date: Distinguished Professor, Mechanical Systems Engineering, TUAT
  • 11/2008-6/2016: Professor, Mechanical Systems Engineering, TUAT
  • 4/2005-10/2008: Associate Professor, Mechanical Systems Engineering, TUAT
  • 4/2002-3/2005: Assistant Professor, Mechanical Systems Engineering, TUAT
  • 4/1995-4/2002: Kuroda Precision Industries LTD. Chief Engineer (4/1998-3/2000) and Deputy Chief (4/2000-4/2002) in R&D Division.
  • 12/1988-10/1990: Lecturer, Mechanical Engineering, SJTU
  • 2/1987-11/1988: Research Associate, Mechanical Engineering, SJTU
  • 8/1982-8/1984: Shanghai Ship and Shipping Research Institute. Assistant Engineer (8/1983-8/1984) in Manufacturing Center.

Main Service to Academic Association

  • Fellow, The Engineering Academy of Japan
  • Executive Board Director, Japan Society for Precision Engineering
  • Chairman, Committee of Ethics for Engineers, Japan Society of Mechanical Engineers
  • Editorial Board Member, International Journal of Electrical Machining
  • Past President, Japan Society of Electrical Machining Engineers
  • Past Executive Board Director, Japan MOT Society
  • Past Editorial Board Member, International Journal of Machine Tools and Manufacture
  • Past Associate Editor, Precision Engineering (Journal of the International Societies for Precision Engineering and Nanotechnology)
  • Past Associate Editor, Journal of Advanced Mechanical Design, Systems and Manufacturing
  • Past Editor-in-Chief, Journal of Japan Society of Electrical Machining Engineers

Selected Research Topics

1) Research on Electrochemical Machining (ECM)

  • Realization of Eco-friendly Electrochemical Micro-machining by Using Ultra-low Concentration Electrolyte
  • ECM Method for Holes with Complex Internal Features by Controlling Conductive Area Ratio along Tool Electrode
  • Shape Generation with Suction Tool with function of Gap-width Detection and Machining Area Confinement
  • Research of Area-limited Electroplating with Suction Tool
  • Study on Electrochemical Machining of Oil Pocket on Sliding Surface with Electrolyte
  • Fast Fabrication of Tungsten Carbide Alloy Micro-pin with Environment-Responsive ECM
  • Investigation of Machining Characteristics of Tungsten Carbide Rod by Using Electrolyte Jet Machining
  • Study on effect of ECM conditions on wettability of machined surface
  • Detection and Control of Gap-width with Peak Current in Pulse ECM
  • Understanding ECM Phenomenon by Using Equivalent Circuit for Electrolytic Reaction
  • Proposal of Pulse Power Supply with Raised Low-level Voltage for Accuracy Improvement in Wire ECM

2) Research on Electrical Discharge Machining (EDM)

  • Study on Influence of Electrode Material on Hole Drilling in Micro-EDM
  • Improvement of Machining Characteristics of Micro-EDM with Ultrasonically Vibrated Machining Fluid under Ultra-small Discharge Energy
  • Micro-Probe Fabrication Utilizing Abnormal Wear on Tool End-Surface in Micro-EDM
  • Understanding Behavior of Working Fluid Movement in Micro EDM through flow analysis

3) Research on Mechanical Polishing

  • Research on Surface Generation with Rotating Polishing Tool
  • Fabrication of Small Polishing Tool by Using Electrophoresis Phenomenon