Evaluation of drilling efficiency by percussion testing of a drill bit with new button arrangement

Kwon, Ki-Beom; Song, Chang-Heon; Park, Jin‐Young; Oh, Joo-Young; Lee, Jae‐Wook; Cho, Jung-Woo

doi:10.1007/s12541-014-0437-3

Cited by 28 publications

(23 citation statements)

References 9 publications

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“…Last, we examine the unloading condition where t m < t, σ i � 0, F � cku − cku f , u 0 � u m , and _ u 0 � 0. Equation (9) when unloading can be expressed as (A.4).…”

Section: Resultsmentioning

confidence: 99%

“…Also, Song et al [8] designed a labscale testing system to test drilling performance of a drill bit and investigated the e ect of bit design factors on the performance of drilling. Kwon et al [9] validated the e ect of drill bit button arrangement on drilling e ciency through a piston percussion test using piston drop testing system. Lundberg and Okrouhlik [10] conducted a study of the 3D e ects on the e ciency of three representative methods for percussive rock drilling (hammer drilling, DTH drilling, and churn drilling) in which the e ciency of various drilling methods was compared via 1D analysis and 3D FEM.…”

Section: Introductionmentioning

confidence: 99%

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Optimal Design Parameters of a Percussive Drilling System for Efficiency Improvement

Song

Chung

Cho

et al. 2018

Advances in Materials Science and Engineering

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is paper aims to determine the optimal design parameters for percussive drilling systems considering the bit-rock interaction. First, the motion dynamics of a bit impacted by a dropped piston are modeled by impact stress propagation and a rock-breaking mechanism representing the penetration resistance coefficient and unloading constant. Next, the damping vibration behavior of the bit is investigated considering the impact duration and the rock loading/unloading condition. In addition, the proposed dynamics are simplified by adopting two dimensionless parameters representing the bit-piston mass ratio and the rock-piston stiffness ratio. Finally, the drilling efficiency, defined by the energy transmitted from the piston to the rock, is presented in terms of the proposed parameters. e use of optimal design parameters for percussive drilling systems improved the drilling efficiency.ese results are applicable to the design and performance estimation of down-the-hole and top-hammer systems.

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“…Last, we examine the unloading condition where t m < t, σ i � 0, F � cku − cku f , u 0 � u m , and _ u 0 � 0. Equation (9) when unloading can be expressed as (A.4).…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optimal Design Parameters of a Percussive Drilling System for Efficiency Improvement

Song

Chung

Cho

et al. 2018

Advances in Materials Science and Engineering

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“…Additionally, we tried to investigate the effect of design factors of a drill bit on the drilling performance. Song et al 10 and Kwon et al 11 showed that the key factors that determine drilling efficiency of a drill bit are the shape of the internal flushing channel and the arrangement of bit buttons. Optimized flushing channels minimize energy loss of the compressed air for effective discharging of rock particles, thus the drilling efficiency can be increased as it was illustrated by CFD simulation in their study.…”

Section: Purpose Of the Lab-scale Testmentioning

confidence: 99%

“…This study provided the three forces (percussion, feed, and revolution) to the bit at once to minimize the performance deviation between the testing system and the Top hammer drill machine. The previous research 10,11,13 works certainly had their limitations in capturing the actual performance between the actual rock and drill bit.…”

Section: Introductionmentioning

confidence: 99%

Development of lab-scale rock drill apparatus for testing performance of a drill bit

Song

Kwon

Cho

et al. 2015

Int. J. Precis. Eng. Manuf.

Self Cite

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This study experimentally validated the reliability of the lab-scale rock drill apparatus and investigated the effect of bit design factors on the performance of drilling. To test drilling efficiency of a drill bit, a testing system was designed and manufactured. Using the testing system, the drilling rates and specific energy of a conventional drill bit and newly proposed drill bit with different button arrangement were compared. The newly proposed model was tested to be superior in drilling performance than that of the conventional model. The testing system developed in this study could be used to predict and test the performance of newly developed drill bit models. Also, the system has to be improved further for measuring more accurate and quantitative data for future drill bit developments.

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“…Kwon et al [2] designed a drill bit with a new button arrangement to improve the drilling efficiency based on a drop-type piston impact test system. Saksala et al [3,4] constructed a 3D numerical model of a bit/rock system and proposed that side cracks were caused by tensile stresses associated with a quick unload, and there was significant shear and tensile damage underneath the hemispherical button.…”

Section: Introductionmentioning

confidence: 99%

Drilling Performance of Rock Drill by High-Pressure Water Jet under Different Configuration Modes

Liu

Chang

2017

Shock and Vibration

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In the rock drilling progress, the resistant force results in tools failure and the low drilling efficiency; thus, it is necessary to reduce the tools failure and enhance the drilling efficiency. In this paper, different configuration modes of drilling performance assisted with water jet are explored based on the mechanism and experiment analysis of rock drilling assisted with water jet. Moreover, the rotary sealing device with high pressure is designed to achieve the axial and rotation movement simultaneously as well as good sealing effect under high-pressure water jet. The results indicate that the NDB and NFB have better effects on drilling performance compared with that of NSB. Moreover, the high-pressure water jet is helpful not only to reduce the drill rod deflection, but also to reduce the probability of drill rod bending and improve the drill rod service life.

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Evaluation of drilling efficiency by percussion testing of a drill bit with new button arrangement

Cited by 28 publications

References 9 publications

Optimal Design Parameters of a Percussive Drilling System for Efficiency Improvement

Optimal Design Parameters of a Percussive Drilling System for Efficiency Improvement

Development of lab-scale rock drill apparatus for testing performance of a drill bit

Drilling Performance of Rock Drill by High-Pressure Water Jet under Different Configuration Modes

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