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


Do great inventions themselves make our daily life abundant and happy? The answer, of course, is "no“, because our rich life is supported not only by inventions, but also by design and manufacturing technologies which realize these inventions. 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 professor working in the Department of Industrial Technology and Innovation, Tokyo University of Agriculture and Technology (TUAT). Dr. Natsu obtained his bachelor degree and master degree in the Mechanical Engineering from Shanghai Jiao Tong University (SJTU), respectively in 1982 and 1987. He served as a lecture during December, 1988 and October, 1990 in SJTU. After obtaining his doctor degree in Mechanical Engineering from TUAT in 1995, He had worked as a chief engineer, and then the deputy chief in R&D division in a precision equipment manufacturer for 7 years. Professor Natsu’s research and teaching interests are in manufacturing and machining, especially in non-traditional machining, such as electrochemical machining (ECM) and electrical discharge machining (EDM).

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