Force-Penetration Curves with a Worn Button Bit in the Percussive Long-Hole Drilling

DOI Web Site 6 Citations 45 References Open Access

Bibliographic Information

Other Title
  • 長尺さく孔におけるボタンビットの貫入特性
  • チョウシャク サクコウ ニ オケル ボタン ビット ノ カンニュウ トクセイ
Published
2008
Resource Type
journal article
DOI
  • 10.2473/journalofmmij.124.785
Publisher
The Mining and Materials Processing Institute of Japan

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Description

A force-penetration relationship is considered to be closely related to the deformation and fracture mechanism at the bit-rock interface. In this study, a series of percussive long-hole drilling tests using Inada granite were carried out to examine the effects of hole length on drilling performace. Stress wave was measured by a pair of strain gauges, and then force-penetration curve of a button bit was calculated by the measured stress wave. The main results are summarized as follows:<BR>1) It can be said that characteristic impedance of hard metal chips has negligible effect on the calculated force-penetration curve, but characteristic impedance of the bit and travelling time from strain gauges to the bit have considerable effect.<BR>2) With increase of hole length, the energy transmitted to the rock decreases, damage around the bottom of the hole decreases, and then the variation in slope of each force-penetration curve decreases.<BR>3) Average advance per blow of rock drill can be expressed by following equations:<BR>(Average advance per blow of rock drill) <BR> = 0.26× (Maximum penetration) <BR>= 0.51× (Final penetration) .

Journal

  • Journal of MMIJ

    Journal of MMIJ 124 (12), 785-793, 2008

    The Mining and Materials Processing Institute of Japan

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