Results 251 to 260 of about 382,665 (308)
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A development in rock cutting technology
International Journal of Rock Mechanics and Mining Sciences, 2000Abstract This paper describes a novel method of rock cutting — oscillating disc cutting (ODC) — in which the forces acting on the cutting tools, and hence on the excavation machine supporting these tools, are extremely low. Four different techniques are incorporated in the cutting method to achieve this result.
Hood, M., Alehossein, H.
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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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Rock cutting by electric pulse method
Izvestiya vysshikh uchebnykh zavedenii. Fizika, 2022The work is devoted to the development of an electric pulse method for processing rocks and other solid dielectric and semiconducting materials. For the first time, experimental studies of the electric pulse method of cutting rocks in water were carried out using a high-voltage pulse generator with a pulse repetition rate of up to 25 impulses per ...
M. Yu. Zhurkov +3 more
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International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, 1972
Abstract The failure process in rock cutting is observed and the formation of a recompacted crushed zone which sticks to the rake face of the cutting tool and acts as ‘the built-up edge’ in metal cutting is described. Based on observation of the process of rock cutting and some simplifying assumptions a theory is developed on the mechanics of rock ...
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Abstract The failure process in rock cutting is observed and the formation of a recompacted crushed zone which sticks to the rake face of the cutting tool and acts as ‘the built-up edge’ in metal cutting is described. Based on observation of the process of rock cutting and some simplifying assumptions a theory is developed on the mechanics of rock ...
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Volume 4: Offshore Geotechnics; Ronald W. Yeung Honoring Symposium on Offshore and Ship Hydrodynamics, 2012
Under atmospheric conditions rock cutting is mostly brittle; either based on tensile cracks or based on shear cracks, although ductile cutting is possible. It is known from the drilling industry that under very high hydrostatic pressures often a sort of ductile cutting process occurs.
Sape A. Miedema, Djurre Zijsling
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Under atmospheric conditions rock cutting is mostly brittle; either based on tensile cracks or based on shear cracks, although ductile cutting is possible. It is known from the drilling industry that under very high hydrostatic pressures often a sort of ductile cutting process occurs.
Sape A. Miedema, Djurre Zijsling
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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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The Depth of Cut in Drilling Mode of Rock Cutting
Applied Mechanics and Materials, 2017Drilling and lateral cutting are two cutting modes used by roadheaders in rock cutting. Accurate estimation of the depth of cut (DOC) of the cutterhead of a roadheader is critical for improving the performance and reliabilityofthe roadheader. Some models have been developed for calculating the DOC of a cutterhead in lateral cutting mode.
Yong Sun, Xing Sheng Li
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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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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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