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Effects of Elastic Behaviours of Dies and Servo Press Machine on Deep Drawing Process
A. Watanabe,Y. Kotani,K. Nishimura,H. Watari,T. Yamazaki 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
Various characteristic features of elastic deformation of dies and presses during deep drawing were presented. It was very important to examine the effects of elastic deformation of these units on product accuracy. Strains were measured on the press system including dies, a slide and a bolster of a servo press. A strain magnitude of 63 ×10<SUP>-6</SUP> was obtained when the overall slide position was at the lowest point. Two slide motions of the servo press were selected to determine appropriate manufacturing conditions. An elastic deformation analysis of the die structure was then required by CAD simulation. To find the appropriate die structure model, the vertical displacement of the die structure in the CAD simulation only was compared to the experiment results. It was found that the vertical displacement of the die structure was 0.176 mm at the top surface of the die considering elastic deformation of the die structure as well as the bolster of the servo press.
P. G. Gucciardi,R. Micheletto,M. Allegrini,T. Kotani,T. Hatada,Y. Kawakami 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.47 No.1
Distributed Bragg Reflectors (DBRs) have been found to be very effective in increasing the efficiency of light emitting diodes and semiconductor laser devices. By using polarization-modulated scanning near-field optical microscopy (PM-SNOM), we investigate the optical response to different illumination polarization states of a DBR structure that consists of a stack of quarter wavelength thick slabs of dielectrics with alternating high and low refractive index. The DBR has been optically characterized in the near-field at different wavelengths in illumination- and in collection- mode with light excitation orthogonal to the probe axis, for fixed as well as for modulated polarization. We have found that the optical signal does not follow the morphological structure of the slabs, as expected but it shows a different spatial periodicity related to the excitation properties and to the interplay of the different DBR planes.