Results 11 to 20 of about 177 (131)
Measurement of Stress Waves Propagation in Percussive Drilling [PDF]
Sensors, 2021 This work describes the results of a test campaign aimed to measure the propagation of longitudinal, torsional, and flexural stress waves on a drill bit during percussive rock drilling. Although the stress wave propagation during percussive drilling has been extensively modeled and studied in the literature, its experimental characterization is poorly ...
Scaccabarozzi D., Saggin B.
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Advances in Femtosecond Laser GHz-Burst Drilling of Glasses: Influence of Burst Shape and Duration
Micromachines, 2023 The femtosecond GHz-burst mode laser processing has attracted much attention in the last few years. Very recently, the first percussion drilling results obtained in glasses using this new regime were reported. In this study, we present our latest results
Pierre Balage +8 more
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Design and Numerical Simulation of Bidirectional Coupling Percussion Drilling Tool
Shiyou jixie, 2022 In order to improve the rock-breaking efficiency in hard formations and meet the needs of deep and ultra-deep well drilling, the bidirectional coupling percussion drilling technique was proposed on the basis of torsional impact rock breaking and ...
Zha Chunqing +5 more
doaj
Shiyou jixieThe compatibility of percussion tools， PDC cutter types and hard rock formations is a key factor in extending the service life of percussion tools and drill bits and achieve the best rock breaking effect， but it has been rarely studied.
Leng Youheng +4 more
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Challenges of rock drilling and opportunities from bio-boring
Biogeotechnics, 2023 Drilling plays a significant role in the history of human civilization. The exploration of greater depths, extreme environments, or hazardous areas calls for more energy-efficient and high levels of autonomous drilling technologies with reduced cost and ...
Yumeng Zhao, Sheng Dai
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Influence of Mechanical Rotary Percussion Tool on Bit Feed Friction of Horizontal Well
Shiyou jixie, 2023 Weight-on-bit(WOB)congestion is one of the main factors restricting the penetration rate of sliding drilling in horizontal wells, and the use of vibration friction reduction tools is the most direct and effective way to reduce friction in horizontal ...
Yan Yan +5 more
doaj
Micromachining of Invar Foils with GHz, MHz and kHz Femtosecond Burst Modes
Micromachines, 2020 In this work, a burst mode laser is used for micromachining of 20 µm–250 µm thick Invar (Fe64/Ni36) foils. Holes were drilled by firing multiple pulses transversely onto the sample without moving the beam (percussion drilling).
Simas Butkus +4 more
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High Efficiency Drilling Methods for Through Beds Hole in Underground Coal Mine
Meikuang Anquan, 2020 Considering the drilling efficiency problem encountered by crossing holes in underground coal mine, the paper divided roof and floor rock stratum into three grades in order to facilitate the study of technology in underground coal mine: high hard rock (4≤
DOU Xuqian
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Identification of Impact Frequency for Down-the-Hole Drills Using Motor Current Signature Analysis
Applied Sciences, 2023 In rotary-percussion drilling, the impact frequency is a crucial variable that is closely linked to operational factors that determine the efficacy of the drilling process, such as the rate of penetration, bit wear, and rock mass characteristics. Typical
Diego Brito +4 more
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