Performance analysis of rotary blast-hole drills through machine vibration and coarseness index mapping – A novel approach

Kumar, Rakesh; Murthy, V. M. S. R.; Kumaraswamidhas, L.A.

doi:10.1016/j.measurement.2020.108148

Cited by 5 publications

(2 citation statements)

References 22 publications

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“…Nevertheless, the specific energy value calculated in the construction process of TBM varies greatly, which lead to the deviation between calculated specific energy value and actual specific energy value. Heydari et al [14], Mohammadi et al [32], and Kumar et al [33] provided the correlation between the particle size distribution of rock chips and the rock-breaking method, namely, the tunneling parameters.…”

Section: Introductionmentioning

confidence: 99%

Identifying Effective Rock-Breaking Ratio Based on Rock Chip Information for Rock-Breaking Efficiency Evaluation of TBM

Zeng,

Yan,

et al. 2023

Geofluids

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The rock chip information (shape, size, and particle size distribution) could comprehensively reflect the characteristics of rock mass and rock-breaking efficiency of TBM. This study is aimed at defining a novel index (effective rock-breaking ratio, P r ) to identify the rock-breaking efficiency of TBM based on the rock chip information. To evaluate this approach, a series of field sieving and measuring tests of rock chips was conducted at the water conveyance tunnel construction projects of China. The rock-breaking efficiency evaluation and tunneling parameter improvement of TBM were researched based on P r index. The results showed as follows: (1) from the perspective of energy conversion, the rock chip surface area was calculated through the rock chip cumulative volume distribution model. P r is used to evaluate the rock-breaking efficiency of TBM based on the proportion of surface area of rock chips with particle size larger than 5 mm; (2) P r has a good linear correlation with coarseness index (CI) and specific energy (SE), the higher the TBM tunneling efficiency, the larger P r and CI values, the less SE values; (3) P r increases at first and then decreases with the rise of thrust force of TBM. The optimal thrust force intervals for grade II and III surrounding rocks can be determined to improve the rock-breaking efficiency of TBM. Findings from this study are insightful in terms of accurately evaluating the excavation efficiency and improving the tunneling parameters of TBM.

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Section: Introductionmentioning

confidence: 99%

Identifying Effective Rock-Breaking Ratio Based on Rock Chip Information for Rock-Breaking Efficiency Evaluation of TBM

Zeng,

Yan,

et al. 2023

Geofluids

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“…In drilling process and wear mechanics, Wang [ 8 ] measured the fiction coefficient of PDC bearing, especially under drilling fluid environment to provide support for the design of the downhole tool where the bearing friction coefficient obviously affects the feasibility and agility of the tools. Kumar [ 9 ] introduced a drill vibration index (DVI) as an indicator of vibration severity of the drill machine and studied its relationship with ROP and average mean partial size. Khanna [ 10 ] compared drilling performances of carbon fiber reinforced plastic (CFRP) composites under dry and cryogenic environment.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation and Experimental Study on the Drilling Process of 7075-t6 Aerospace Aluminum Alloy

Luo

Tang

et al. 2021

Materials

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A finite element model for setting drilling conditions is established. The effect of feed speed and spindle speed on the drilling process was studied. In the test phase, drilling tests were conducted using three different feed speeds (60, 100, and 140 mm/min) and three different spindle speeds (800, 1000, and 1200 rpm). The correctness of the finite element model was verified by comparing the experimental and numerical simulation data. The results show that the axial force and torque increase significantly with the increase of feed speed, while the axial force and torque increase less as the spindle speed increases. The numerical simulation results show that the temperature of the cutting edge increases as the feed speed increases. Increasing the rotating speed increases the formation of chip curl. When the working conditions are high rotating speed and low feed, the tool wear is reduced, and the machining quality is better. The numerical simulation results obtained for the chip forming effect are similar to the experimental data. In addition, the simulation results show the generation of burrs. A comparison of the finite element simulation and experimental data leads to an in-depth understanding of the drilling process and ability to optimize subsequent drilling parameters, which provide reliable process parameters and technical guarantees for the successful implementation of drilling technology for space suspended ball structures.

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Experimental Investigation into Mixed Tool Cutting of Granite with Stinger PDC Cutters and Conventional PDC Cutters

et al. 2021

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Performance analysis of rotary blast-hole drills through machine vibration and coarseness index mapping – A novel approach

Cited by 5 publications

References 22 publications

Identifying Effective Rock-Breaking Ratio Based on Rock Chip Information for Rock-Breaking Efficiency Evaluation of TBM

Identifying Effective Rock-Breaking Ratio Based on Rock Chip Information for Rock-Breaking Efficiency Evaluation of TBM

Numerical Simulation and Experimental Study on the Drilling Process of 7075-t6 Aerospace Aluminum Alloy

Experimental Investigation into Mixed Tool Cutting of Granite with Stinger PDC Cutters and Conventional PDC Cutters

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