Development of Microscopic Hardness and Stiffness Investigation System with Microrobot 2nd Report, Vision Based Precise Navigation
Montree Pakkratoke*, Shinnosuke Hirata**, Chisato Kanamori*,
and Hisayuki Aoyama*
*Department of Mechanical Engineering and intelligent systems, The University of Electro-Communications, 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585, Japan
**Department of Mechanical and Control Engineering, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro, Tokyo 152-8552, Japan
A microsurface measurement system that is composed of the microrobot with the indenter and a vision based navigation system is proposed for investigating hardness and stiffness of such microparts. Here the tiny robot with the electromagnetic legs and the piezo elements incorporates with an electromagnetic driven microforce generator. This force generator can provide small forces up to 17 mN with 50 µN resolutions and push down the microindenter to the surface. The displacement of the indenter head can be also measured by the Linear Valuable Differential Transformer (LVDT) on machine. Thus, this mechanism can generate the small force and monitor the depth behaviour of the indenter during whole dwell time. Since the overall size of this mechanism is small enough to implement on the piezo-driven microrobot, the tiny robot with the microindenter is capable tomove precisely step by step with 1 µm per step so that the microindenter could be penetrated anywhere on the sample surface. With the help of an image processing technique, the vision based coordination system with the local close-up view and the overall global view has been developed to identify the locations of small robot and the indenter precisely within ±3 µm accuracy over the working range. In the experimental results, several results that the indentation load-depth characteristics of the unhealthy human tooth are measured automatically at the specified point are discussed.
-  M. Gasko and G. Rosenberg, “Correlation between hardness and tensile properties in ultra-high strength dual phase steels-short communication,” Materials Engineering, Vol.18., pp. 155-159, 2011.
-  Y.-L. Shen and N. Chawla, “On the correlation between hardness and tensile strength in particle reinforced metal matrix composites,” Materials science and engineering, A297, pp. 44-47, 2001.
-  M. A. Salazar-Guapuriche, Y. Y. Zhao, A. Pitman, and A. Greene, “Correlation of strength with hardness and electrical conductivity for aluminum alloy 7010,” Materials science forum., Vol.519-521, pp. 853-858, 2006.
-  J. B. Pethica, “Ion implantation into metals,” Proc. of the 3rd Int. Conf. on Modification of Surface Properties of Metals by Ion Implantation, held at UMIST, Manchester, p. 147, 1981.
-  E. T. Lilleodden, W. Bonin, J. Nelson, J. T. Wyrobek, and W. W. Gerberich, “In situ imaging of µN load indents into GaAs,” J. of Materials Research, Vol.10, Issue 09, pp. 2162-2165, 1995.
-  N. A. Burnham and R. J. Colton, “Measuring the Nanomechanical Properties and Surface Forces of Materials Using an Atomic Force Microscope,” J. of Vacuum Science and Technology A, Vol.7, No.4, p. 2906, 1989.
-  T. J. Bell, A. Bendeli, J. S. Field, M. V. Swain, and E. G. Thwaite, “The determination of surface plastic and elastic properties by ultramicro-indentation,” Metrologia, Vol.28, No.6, pp. 463-469 1992.
-  CSIRO Telecommunication & Industrial Physics, Lindfield NSW 2070 Australia, “Ultra-micro indentation system (UMIS),” unpublished.
-  P.Montree, S. Hirata, C. Kanamori, and H. Aoyama, “Development of microscopic hardness and stiffness investigation system with microrobot,” J. of Robotics and Mechatronics, Vol.24, No.1, pp. 123-132, 2012.
-  S. Fatikow, J. Seyfriend, St. Fahlbusch, A. Buerkle, and F. Schmoeckel, “A Flexible Microrobot-Base Microassembly Station,” J. of Intelligent and Robotic Systems, Vol.27, pp. 135-169, 2000.
-  “IMAQ Vision concept manual,” National Instruments, June 2003.
-  J. K. Avery, “Oral development and history 3rd ed.,” Thieme medical publishers Inc., pp. 72-73, 2002.
Copyright© 2013 by Fuji Technology Press Ltd. and Japan Society of Mechanical Engineers. All right reserved.