Results 181 to 190 of about 13,374 (211)
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Evaluation of drilling efficiency by percussion testing of a drill bit with new button arrangement
International Journal of Precision Engineering and Manufacturing, 2014Rock drilling machines are commonly used for surface drilling, soil nailing reinforcement, tunnel excavation, and underground mining. These machines use drill bits that directly impact into the rock and are operated by percussive force and torque. Drill-bit buttons need to be designed to increase drilling efficiency; here, we present the results of a ...
Jae-Wook Lee +2 more
exaly +2 more sources
Numerical and experimental study of percussive drilling with a triple-button bit on Kuru granite
International Journal of Impact Engineering, 2014Abstract This paper deals with numerical and experimental research of percussive drilling. A finite element based modelling approach, developed earlier by the authors, was employed in the simulation of the dynamic bit-rock interaction process. The rock fracture in this approach was modelled with a damage-viscoplasticity model accounting for the main ...
Mikko Hokka +2 more
exaly +2 more sources
Modeling of force-penetration curves for a button bit during impact penetration into rock
International Journal of Rock Mechanics and Minings Sciences, 2017K. Hashiba +4 more
exaly +2 more sources
Research on Diamond Enhanced Rare-Earth and Iron-Rich Carbide Tungsten Composite Button and Its Bit
Key Engineering Materials, 2004Xiao Liang Shi +2 more
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WEAR TESTING OF BUTTONS IN BITS FOR BLASTHOLE DRILLING
Tribologia, 2018The article presents the results of the wear testing of buttons in selected types of bits with the diameter of 95 mm used for blast hole drilling in a rock mining. The purpose of the testing was to determine the type of the wear of peripheral and frontal buttons in the actual operating conditions of bits and the impact of selected parameters of the ...
Rafał DUDEK, Krzysztof WŁADZIELCZYK
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Critical Investigation of Wear Behaviour of WC Drill Bit Buttons
Rock Mechanics and Rock Engineering, 2012Mining and petroleum drill bits are subjected to highly abrasive rock and high-velocity fluids that cause severe wear and erosion in service. To augment the rate of penetration and minimize the cost per foot, such drill bits are subjected to increasing rotary speeds and weight.
Anurag Gupta +2 more
openaire +1 more source
International Journal for Numerical and Analytical Methods in Geomechanics, 2012
SUMMARYThis paper considers numerical modelling of rock fracture induced by dynamic bit–rock interaction in percussive drilling. The work presented here extends the author's earlier research on the topic from the axisymmetric case to 3D case. The numerical method for modelling rock fracture includes a constitutive model for rock and a contact mechanics‐
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SUMMARYThis paper considers numerical modelling of rock fracture induced by dynamic bit–rock interaction in percussive drilling. The work presented here extends the author's earlier research on the topic from the axisymmetric case to 3D case. The numerical method for modelling rock fracture includes a constitutive model for rock and a contact mechanics‐
openaire +2 more sources
Evaluation of a Drill Bit Button Arrangement for Enhanced Drilling Efficiency
Transactions of the Korean Society of Mechanical Engineers A, 2015The drill bit, which directly transmits percussive forces and torque to the rock, is the core part of a rock drilling machine. For effective drilling, the button arrangement of a drill bit should be optimized because it is the most important design factor in determining drilling efficiency.
Hoon Kang +5 more
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Comparison of Drilling Performance of Chisel and Button Bits on the Electro Hydraulic Driller
Rock Mechanics and Rock Engineering, 2012Electro hydraulic drillers have been widely used in mining for drilling and roof-bolting. In the drilling process, the performance of the machine is predicted by selecting an appropriate bit type prior to drilling operations. In this paper, a series of field drilling studies were conducted in order to examine and compare the performance of chisel and ...
Olgay Yaralı, Nuri Ali Akcin, Okan Su
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