Results 11 to 20 of about 5,423 (259)
Effect of Bit Configuration in Impact Penetration Tests with Button Bits
Journal of MMIJ, 2016 Computer simulation of percussive rock drilling requires appropriate numerical models for the interactions among the drill body, rod, rod joint, bit, and rock.
Yingzong LIANG +4 more
doaj +1 more source
Applied Sciences, 2023 The interaction between the drill bit and rock is a complex dynamic problem in the process of drilling and breaking rock. In this paper, the dynamic process of drilling and breaking rock is analyzed using ABAQUS software.
Xinxing Liu +3 more
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Drilling Processes with Hydraulic Percussion Rock Drills
Journal of MMIJ, 2017 Rock drills were developed about two hundred years ago, and hydraulic percussion rock drills are about half-century old. Performance and efficiency of rock drills have been increased by a number of researchers and engineers.
Kimihiro HASHIBA +2 more
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On Rock Drilling Machinery [PDF]
Proceedings of the Institution of Mechanical Engineers, 1874 n ...
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Prediction Model of Drilling Performance for Percussive Rock Drilling Tool
Advances in Civil Engineering, 2020 This study suggests a method for quantitatively estimating the drilling performance of the down-the-hole (DTH) hammer during percussive drilling of rock surfaces. A pneumatic dynamic model of the DTH hammer was developed that considers the mass flow rate
Dae-Ji Kim +6 more
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Dust Control in Rock Drilling [PDF]
American Journal of Public Health and the Nations Health, 1940 THE importance of silicosis as an occupational disease has been demonstrated in many industries. Such investigations have shown rock drilling in hard-rock mining and other drilling operations to be hazardous, even including open drilling in quarries, road construction, and building excavation.
L, Greenburg +3 more
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Shock and Vibration, 2018 In the production and manufacturing process of hydraulic rock drill, there are small impact energy and low impact frequency, and a fault diagnosis method based on the internal mechanism testing and testing of the hydraulic rock drill is proposed.
Yelin Li, Youxin Luo, Xiao Wu
doaj +1 more source
On Recent Trials of Rock Drills [PDF]
Proceedings of the Institution of Mechanical Engineers, 1891 n ...
Carbutt, Edward H., Davey, Henry
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Study on Monitoring Rock Burst through Drill Pipe Torque
Shock and Vibration, 2015 This paper presents a new method to identify the danger of rock burst from the response of drill pipe torque during drilling process to overcome many defects of the conventional volume of drilled coal rubble method.
Zhonghua Li +3 more
doaj +1 more source
British Educational Research Journal, EarlyView., 2023 Abstract Children's relationship with time in preschools is an under‐researched area. Young children rarely know how to measure time using a clock, but their experiences of time may contribute to understanding children's well‐being and debates about quality in preschools.
Kristín Dýrfjörð +3 more
wiley +1 more source