Results 261 to 270 of about 1,056,070 (342)

Research on surrounding rock deformation characteristics and support optimization measures for tunnel TBM crossing through fault fracture zones. [PDF]

Sci Rep
Lan F, Du W, Li R, He C, He J, Yan J.
europepmc   +1 more source

Study on vibration characteristics of roadheader cutting pre-cracked hard rock. [PDF]

Sci Rep
Liu H, Li F, He J, Wang W, Zhang H.
europepmc   +1 more source

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Rock Drill

Scientific American
J. Epstein
semanticscholar   +5 more sources

Analysis of Coupled Axial-Torsional Drill-String Vibration Based on Fuzzy Bit-Rock Interaction Model Considering Bit Balling Condition

IEEE Transactions on Industrial Informatics, 2023
In this article, a coupled axial-torsional drill-string vibration model is established, which considers the influence of bit balling on rock-breaking and drill-string vibration.
He Huang, Chengda Lu, Sike Ma, Min Wu
semanticscholar   +1 more source

Influence of Tempering Temperature on the Microstructure and Mechanical Properties of a Cr–Ni–Mo‐Alloyed Steel for Rock Drill Applications

Steel Research International, 2019
This research investigates the mechanical properties of a Cr–Ni–Mo‐alloyed rock drill steel tempered at different temperatures from 150 to 550 °C. The highest strength, hardness, and impact energy occur when the steel is tempered at 180 °C.
Mingchun Zhao, Tuguldur Unenbayar, Ying Zhao, Chao Liu, Yan Tian, D. Yin, A. Atrens   +6 more
semanticscholar   +1 more source

Research on Motion Algorithm for Intelligent Operation of Rock Drill With Eight Degrees of Freedom

International Symposium on Robotics, 2018
An algorithm for intelligent operation of eight-degree-of-freedom hydraulic rock drill is proposed. With the help of a total station instrument, the position the rock driller was obtained.
Yundou Xu, S. Tong, Zhongjin Ju, Zengzhao Wang, Yunfeng Zhao, Jiantao Yao, Yongsheng Zhao   +6 more
semanticscholar   +1 more source

Stochastic modeling for hysteretic bit–rock interaction of a drill string under torsional vibrations

Journal of Vibration and Control, 2019
This paper aims at constructing a stochastic model for the hysteretic behavior of the nonlinear bit–rock interaction of a drill string under torsional vibrations.
F. Real, A. Batou, T. Ritto, C. Desceliers   +3 more
semanticscholar   +1 more source

Rock penetration into cemented carbide drill buttons during rock drilling

Wear, 2008
In percussive and rotary percussive rock drilling, the rock is crushed into small fragments by the repeated hard impact of the drill bit, and subsequently removed by flushing water or air. To avoid excessive wear, the steel drill bit is equipped with a set of cemented carbide buttons that protrude from the bit to take the actual impact.
Ulrik Beste, Staffan Jacobson, Sture Hogmark   +2 more
openaire   +1 more source

Rock Drill

2023
Ma Fei, Xu Kuangdi
openaire   +1 more source