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Volume 38 (2004)
- Issue 89 Pages 5-
- Issue 88 Pages 8-
- Issue 87 Pages 7-
Volume 38, Issue 89
Displaying 1-4 of 4 articles from this issue
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Katsunori TAMIYA, Hidehiko MAEHATA2004 Volume 38 Issue 89 Pages 5-12
Published: November 30, 2004
Released on J-STAGE: March 12, 2010
JOURNAL FREE ACCESSDownload PDF (7978K) -
J. A. McGeough2004 Volume 38 Issue 89 Pages 13-17
Published: November 30, 2004
Released on J-STAGE: March 12, 2010
JOURNAL FREE ACCESSDefinitions for micro and nano-technology are introduced and discussed. Applications within microelectronics are first described. Attention is then drawn to the utilisation of micro- technology in orthopaedic engineering, where micro- and nano-sized effects occur in surgery. The role of unconventional micro and precision machining and deposition methods is considered, especially in relation to the use of titanium alloy for implants. Micromotions that occur in implants following surgery are discussed. The paper concludes with a discussion on the use of the rapid prototyping technology, micro stereolithography, for repair of diseased bone scaffolds.View full abstractDownload PDF (7696K) -
Chika FURUDATE, Masanori KUNIEDA2004 Volume 38 Issue 89 Pages 18-26
Published: November 30, 2004
Released on J-STAGE: March 12, 2010
JOURNAL FREE ACCESSThis paper describes the influence of oscillation of the gap length on gap phenomena in dry-WEDM. Dry-WEDM was found to have some problems such as a higher susceptibility to wire breakage due to the localization of discharge spots and a lower material removal rate than conventional WEDM, because of the frequent occurrence of short circuiting due to a narrower discharge gap length Since the material removal rate depends on the normal discharge frequency, the gap length was altered periodically using a piezoelectric actuator to obtain the relation between the gap length and normal discharge frequency. It was found that 1) The fluctuation of total discharge frequency corresponding to the change in gap length is larger in the dry method than in the conventional method because of the narrower gap length in dry-WEDM. 2) Hysteresis was observed in the change in total discharge frequency, and the total discharge frequency was higher during the period of gap widening compared with the period of gap narrowing. 3) Since the short circuiting rate is high in dry-WEDM, the normal discharge frequency is one third that in conventional WEDM. 4) The ratio of the normal discharge frequency in dry-WEDM to that in conventional WEDM is higher than the ratio of the material removal rates. Hence, it is considered that the total volume of debris evacuated from the gap per one pulse discharge in the dry method is smaller than that in the conventional method.View full abstractDownload PDF (9417K) -
Akira OKADA, Yoshiyuki UNO, Kohsuke SATO, Ken HACHINOTA, Kensuke UEMUR ...2004 Volume 38 Issue 89 Pages 27-34
Published: November 30, 2004
Released on J-STAGE: March 12, 2010
JOURNAL FREE ACCESSA new surface finishing process for bio-titanium alloy products by wide-area electron beam (EB) irradiation is proposed. In the wide-area EB irradiation equipment, a high-energy-density EB can be irradiated without concentrating the beam. Therefore, a wide-area EB with a maximum diameter of 60mm can be used for instantaneously melting or evaporating a metal surface. Experimental results clarified that the surface roughness becomes smaller and the surface glossiness becomes higher with increasing energy density of the beam. Under an appropriate irradiation condition, the surface roughness of titanium alloy machined with an end mill could be decreased from 10μmRz to less than 1μmRz in 150 seconds. Moreover, the corrosion resistance and the repellency could be improved simultaneously. Therefore, the wide-area EB irradiation method may enable the highly efficient surface smoothing and surface modification of bio-titanium alloy.View full abstractDownload PDF (11543K)
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