Results 111 to 120 of about 164 (152)

Rotary Percussion and Auger Drilling

2010
In rotary percussion drilling, a variety of blade or roller bits (Fig. 5.2) mounted on the end of a rotating string of rods cut and break the rock. A percussion or hammer action in conjunction with a chisel bit can be used to penetrate hard material.
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Quantitative estimate of rotary–percussion drilling efficiency in rocks

Journal of Mining Science, 2016
The factors that have significant influence on efficiency of rotary–percussion rock drilling with downhole machines are discussed. The results obtained in physical simulation of dynamic driving of rock-breaking indenters in rocks are reported. The results are analyzed from the standpoint of the phenomenon of alternating response of rocks to dynamic ...
V. N. Oparin, V. V. Timonin, V. N. Karpov   +2 more
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Drilling rate of rotary percussion drill bits and rock characteristics

Journal of Terramechanics, 1988
Abstract Fourteen kinds of rock specimen and rock mass were tested to find the main rock mass characteristics affecting the drilling rate of a bit in rotary percussion by 2 hand-type electric and air hammer drills. It was found that the drilling rate of the bit, V (cm/min), consuming constant rotary percussion power of 1050 W could be expressed as ...
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A 3D FEM Methodology for Rock Breakage in Rotary-Percussive Drilling

2010 International Conference on Computational and Information Sciences, 2010
In order to reveal the rock breaking mechanism of the rotary-percussive drilling, considering the coupling effect of the static pressure, impact force and rotary cutting and using the finite element methods (FEM), a three-dimensional (3D) insert-rock mutual action model is established.
Xiao Xiaohua, Zhu Haiyan, Liu Qingyou, Fan Yongtao, Wang Degui, Chen Bo   +5 more
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Development of a rotary-percussive ultrasonic drill for extraterrestrial rock sampling

2017 IEEE International Ultrasonics Symposium (IUS), 2017
Compared with traditional rotary-percussive drills driven by electromagnetic motors, ultrasonic drills show advantages of small size, low power, low weight on bit, and lubrication free, making them available for the extraterrestrial rock sampling, especially for the minor planet with a weak gravitational field.
Qiquan Quan, Deen Bai, Zhijun Zhao, Zongquan Deng, He Li, Yinchao Wang   +5 more
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Effectual design of hammers for rotary-percussive drilling machines

Journal of Mining Science, 2011
Based on the review over theoretical and experimental analyses of influence the drilling machine hammer design exerts on the rock fracture process efficiency, the author draws a conclusion that hammers with curvilinear side surfaces are not an optimal choice as they do not provide a noticeable increase in the impact energy utilization while greatly ...
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Results from Testing of Two Rotary Percussive Drilling Systems

Earth and Space 2010, 2010
The developmental test program for the MSL (Mars Science Laboratory) rotary percussive drill examined the e ect of various drill input parameters on the drill pene- tration rate. Some of the input parameters tested were drill angle with respect to gravity and percussive impact energy. The suite of rocks tested ranged from a high strength basalt to soft
Kristopher Kriechbaum, Kyle Brown, Ian Cady, Max von der Heydt, Kerry Klein, Eric Kulczycki, Avi Okon   +6 more
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Prototype rotary percussive drill for the Mars Sample Return mission

2011 Aerospace Conference, 2011
Since 1990s Honeybee Robotics has been developing and testing surface coring drills for future planetary missions. Recently, we focused on developing a rotary-percussive core drill for the 2018 Mars Sample Return mission and in particular for the Mars Astrobiology Explorer-Cacher, MAX-C mission.
Kris Zacny, Jack Wilson, Phil Chu, Jack Craft   +3 more
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The wear of WC-Co drill bits during rotary-percussive drilling of reinforced concrete

International Journal of Refractory Metals and Hard Materials, 2017
Abstract The wear mechanisms of WC-Co hardmetal drill bits during rotary-percussive drilling of reinforced concrete depend a number of factors such as the loading spectrum (thermo-mechanical stresses); workpiece material (type of concrete and reinforcement steel); hardmetal grade (WC-grainsize and Co-content); and drill bit geometry (design and ...
Siavash Momeni, Steven Moseley, Michael Ante, Jan Allaart   +3 more
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Reduction of power-intensivity at rotary-percussive drilling

Geo-Technical mechanics, 2020
O.Ye. Nazarov, V.F. Gankevych, O.A. Pashchenko, V.Ya. Kiba   +3 more
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