Journal of the Japan Society for Abrasive Technology
Online ISSN : 1880-7534
Print ISSN : 0914-2703
ISSN-L : 0914-2703
Volume 54, Issue 3
MAR.
Displaying 1-4 of 4 articles from this issue
  • Akira MIZOBUCHI, Hitoshi OGAWA
    2010 Volume 54 Issue 3 Pages 145-150
    Published: March 01, 2010
    Released on J-STAGE: January 12, 2011
    JOURNAL FREE ACCESS
    This paper discusses through hole drilling of soda-lime glass plate using an electroplated diamond tool to determine appropriate drilling conditions, grain size, and tool geometries for smaller cracks and higher processing efficiency. The machining times of helical drilling were short in comparison with step drilling, because the drilling method has a rapid feed speed. In addition, the tool with a space for chip removal is effective for chip removal and crack control. The crack sizes at the entrance and exit are smallest under a spindle revolution of 20000 min-1, feed speed (tangential direction) of 20 mm/min, helical pitch of 0.3 mm, and mesh size of #600. The crack size at the exit is small in the case of reciprocating drilling.
    Download PDF (1387K)
  • Shizuichi HIGUCHI, Masaru TSUCHIYA
    2010 Volume 54 Issue 3 Pages 151-156
    Published: March 01, 2010
    Released on J-STAGE: January 12, 2011
    JOURNAL FREE ACCESS
    Vibration-assisted finishing, which leaves a detailed continuous circular line pattern crossing mutually on the metal surfaces, is a newly developed ornamental abrasive finishing method. However, application of this finishing method and evaluation of the finished surfaces require skill and are dependent on sensory examination. This paper presents a quantitative evaluation of the finished surfaces obtained by vibration-assisted finishing. For this purpose, textural features were extracted from finished surface images by the gray level co-occurrence matrix and 2-D DFT. Moreover, the effects of finishing conditions on their geometric characteristics were investigated.
    Download PDF (1843K)
  • – Fundamental analysis of the wear behavior of grain cutting edges based on cluster overcut fly grinding tests –
    Shigeru HABU, Yoshio ICHIDA, Hitoshi KAJINO, Masakazu SATO
    2010 Volume 54 Issue 3 Pages 157-163
    Published: March 01, 2010
    Released on J-STAGE: January 12, 2011
    JOURNAL FREE ACCESS
    To clarify the wear characteristics of vitrified diamond grinding wheels, the wear behavior of grain cutting edges on the wheel surface was analyzed experimentally based on cluster overcut fly grinding tests using diamond abrasive grains of some different grades. The wear of diamond wheels decreased with increases in strength of the diamond abrasive grain. However, as the strength of the diamond grain increased, the grain cutting edges on the wheel surface became dull more easily because the self-sharpening due to microfractures of cutting edges does not occur easily. Average sectional area of the grain cutting edge measured from the three-dimensional profile of the wheel surface can be used to identify the differences in wear mode of the cutting edge due to the strength of the diamond grain.
    Download PDF (2689K)
  • Shigeru HABU, Yoshio ICHIDA, Hitoshi KAJINO, Masakazu SATO
    2010 Volume 54 Issue 3 Pages 164-171
    Published: March 01, 2010
    Released on J-STAGE: January 12, 2011
    JOURNAL FREE ACCESS
    This study was performed to clarify the influence of wheel wear on the wheel surface topography in the grinding process with a vitrified diamond wheel. To investigate the relation between wheel surface topography and grain wear behavior, cylindrical plunge grinding experiments of alumina ceramics were conducted using vitrified diamond wheel with the 200 concentration, and the changing wheel surface during the grinding process was observed using a replica-SEM method. The wear process of the grain cutting edge can be classified into three types based on the changes in attritious wear flat area of the grain cutting edge with grinding: (a) attrition wear type, (b) attrition wear-fracture wear type, and (c) self-sharpening type. Even if the self-sharpening by micro-fracture occurs, attritious wear flat is always left on the apical surface of the grain cutting edge. Therefore, the self-sharpening phenomenon by micro-fracture hardly causes any unevenness in the height of the cutting edge on the wheel working surface.
    Download PDF (3001K)
feedback
Top