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

Song, Chang-Heon; Kwon, Ki-Beom; Cho, Min-Gi; Oh, Joo-Young; Shin, Dae-Young; Cho, Jung-Woo

doi:10.1007/s12541-015-0185-z

Cited by 12 publications

(6 citation statements)

References 15 publications

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“…To predict the performance of the percussive drilling system, an analysis of the performance of the percussive drilling tool (e.g., DTH hammer), location of the drill button bit, and its effect on the subsequent fracturing of the rock is required. As there is no standard for button impact testing, researchers have conducted tests by building vertical or horizontal button test machines [12][13][14][15][16]. In this study, the test system shown in Figure 6 was used for quantitative analysis of the button impact.…”

Section: Drilling Performance With Buttonsmentioning

confidence: 99%

Prediction Model of Drilling Performance for Percussive Rock Drilling Tool

Kim

Lee

et al. 2020

Advances in Civil Engineering

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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 relations representing the orifice opening areas of the air tube, the piston, and bit flushing channels. A drill bit motion model was developed to represent the dynamics of a drill bit impacted by a dropped piston and explain the impact stress propagation and rock-crushing mechanism. The rock-crushing effect of the drill button bit was measured through a piston drop test. The pneumatic hammer model and drill bit motion model were then combined in a prediction model to determine the impact efficiency according to different rock types (i.e., soft, medium-hard, and very hard). The drilling efficiency was defined as the input value of the prediction model, which was used to simulate the drilling performance of DTH hammers considering the rock type and dynamic effect of the drill bit. Finally, the simulation results were compared with the results of in situ drilling tests for verification.

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Section: Drilling Performance With Buttonsmentioning

confidence: 99%

Prediction Model of Drilling Performance for Percussive Rock Drilling Tool

Kim

Lee

et al. 2020

Advances in Civil Engineering

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“…Song et al [1] proposed optimal design factors and range for top-hammer drill bit based on multiphase ow simulation and response surface methodology (RSM). 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.…”

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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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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“…1). The operation of the hydraulic drifter co mprises propulsion (the hydraulic cy linder applies propulsion to the drifter to ensure that the drill shank is constantly in contact with the rock), impact (the hydraulic pump prov ides fluid pressure energy to the drifter; the impact piston reciprocally impacts the shank adapter; and the drill shank transfers the impact energy to the rock in the form of stress waves, thus causing the rock to rupture), gyration (the torque output by the hydraulic motor causes the drill bit to gyrate to a new position after each impact, and part of the cracked rock surface is removed), and flushing (the auxiliary water pu mp flushes the broken rock powder in the borehole) (Lin, 2014;Zou, 2017;Song, et al, 2015) (Fig . 2).…”

Section: Introductionmentioning

confidence: 99%

Existence scope of only primary vibration within one impact period of a hydraulic drifter piston via point transformation

Yang

Hong

Li³

2018

JAMDSM

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The impact p rocess of hydraulic drifter is a periodic vibrat ion course with position feedback and p iston control by shuttle valve. For the phenomena of secondary or mult iple v ibrations within one period during cyclic impact process of hydraulic drifter, this study establishes a dynamic mod el of the system during hydraulic impact and analyzes the vibration behavior of piston in the impact process of hydraulic drifter fro m the perspectives of velocity recovery coefficient R, acceleration ratio K F , and accelerat ion switching t ime K t . Then, the impact point position for the nonlinear periodic motion of the piston is observed through point transformation and Jacobian technique. Subsequently, a spatial scope defined by correlated system parameters R, K F , and K t is identified, within this scope, the p iston only stably vibrates once within one impact period. Finally, the position of the signal port is redesigned on the basis of the existence scope, and the design parameters for the hydraulic drifter are improved. The correctness of the derivation p rocess and the conclusion of this study are experimentally verified. The present findings provide a basis for reasonably match ing the relationships among design parameters and can help improve drifter impact efficiency.

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

Cited by 12 publications

References 15 publications

Prediction Model of Drilling Performance for Percussive Rock Drilling Tool

Prediction Model of Drilling Performance for Percussive Rock Drilling Tool

Optimal Design Parameters of a Percussive Drilling System for Efficiency Improvement

Existence scope of only primary vibration within one impact period of a hydraulic drifter piston via point transformation

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