Results 251 to 260 of about 380,756 (310)
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Strength of Materials, 1990
A theory is suggested for rock cutting resistance based on a model of cutting in a brittle mode, i.e. with a latent internal sliding crack. The theory considers any plastic, viscous and other irreversible strains for a body subjected to cutting;. and also any spatial configuration of the cutter.
A. G. Cherepanov, G. P. Cherepanov
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A theory is suggested for rock cutting resistance based on a model of cutting in a brittle mode, i.e. with a latent internal sliding crack. The theory considers any plastic, viscous and other irreversible strains for a body subjected to cutting;. and also any spatial configuration of the cutter.
A. G. Cherepanov, G. P. Cherepanov
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Strength of Materials, 1986
1. Theoretical analysis of oscillations during cutting of rocks detected the presence of three maxima in the oscillation spectrum (located in the ranges 102, 103, and 104 Hz respectively for typical cutting conditions). The first two maxima relate to inertia-free relaxation oscillations of the stick-slip type, occurring as a result of projection ...
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1. Theoretical analysis of oscillations during cutting of rocks detected the presence of three maxima in the oscillation spectrum (located in the ranges 102, 103, and 104 Hz respectively for typical cutting conditions). The first two maxima relate to inertia-free relaxation oscillations of the stick-slip type, occurring as a result of projection ...
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Rock Cutter Interactions in Linear Rock Cutting
Volume 1: Processing, 2016Polycrystalline diamond compact (PDC) cutter, as a major cutting tool, has been widely applied in oil and gas drilling processes. The understanding of the complex interactions at the rock and cutter interfaces are essential for the advancement of future drilling technologies, yet, these interactions are still not fully understood.
Demeng Che +2 more
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Cutting efficiency and life of rock-cutting picks
Mining Science and Technology, 1985Abstract This paper summarises the results obtained in testing rock-cutting picks using a boom tunnelling machine test rig, cutting in hard limestone. Pick life and cutting efficiency were measured under controlled experimental conditions. The parameters investigated included pick type and quality, depth and speed of cutting and the cobalt content of
K.G. Hurt, K.M. MacAndrew
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Experiments in hydraulic rock cutting
International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, 1975Abstract A theory of hydraulic rock cutting was tested by conducting experiments on four different rocks in the laboratory. The tests involved directing a stationary high speed water jet of small diameter onto a moving rock target. The slot thus cut in the rock was measured to determine an average depth. The theory of hydraulic rock cutting provides
G.H. Hurlburt, S.C. Crow, P.V. Lade
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Electric-discharge cutting of rocks
Journal of Mining Science, 2008The test data are reported on rock cutting by the electric discharge with movable and stationary electrodes. The specific crushing energy is determined, the electrode system design is optimized, and the high-voltage impulse parameters selected for highly efficient fracture.
V. F. Vazhov +3 more
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International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, 1973
Abstract The principles of rock cutting are reviewed and differentiation made between linear and impact cutting. Theoretical aspects of cutting are discussed with particular reference to the tensile splitting theory. The role played by the rock fabric in relation to its cutting characteristics is examined.
B.N. Whittaker, A.B. Szwilski
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Abstract The principles of rock cutting are reviewed and differentiation made between linear and impact cutting. Theoretical aspects of cutting are discussed with particular reference to the tensile splitting theory. The role played by the rock fabric in relation to its cutting characteristics is examined.
B.N. Whittaker, A.B. Szwilski
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1994
The paper describes with practical case studies how some of the important factors influencing the excavation performance of boom tunnelling machines equipped with drag tools may be predicted. The pitfalls of basing performance predictions on compressive strength alone are discussed.
R. J. Fowell +2 more
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The paper describes with practical case studies how some of the important factors influencing the excavation performance of boom tunnelling machines equipped with drag tools may be predicted. The pitfalls of basing performance predictions on compressive strength alone are discussed.
R. J. Fowell +2 more
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Rock Customized Shaped Cutters Improve Rock Cutting Efficiency
SPE/IADC International Drilling Conference and Exhibition, 2019Abstract Failing the rock and removal of failed rock are the two primary actions that control drill bit efficiency. A proper design must address both primary actions while focusing on the major efficiency driver. This has been the basis for development of shaped cutter technology where the geometry of polycrystalline diamond compact (PDC)
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