Effects of Different Cutting Patterns and Experimental Conditions on the Performance of a Conical Drag Tool

Copur, Hanifi; Bilgin, N.; Balcı, Cemal; Tumaç, Deniz; Avunduk, E.

doi:10.1007/s00603-017-1172-8

Cited by 59 publications

(16 citation statements)

References 12 publications

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“…12 is a scatter plot of the specific energy consumption calculated by Eq. 6 4 Experimental study A large number of rock cutting experiments have been done at home and abroad [2,[23][24][25][26][27].The experiments were conducted on the Coal-rock Cutting Machine (CCM) in Central South University. As shown in Fig.…”

Section: Se W V Ttnmentioning

confidence: 99%

Establishment of Coal-rock Constitutive Models for Numerical Simulation of Coal-rock Cutting by Conical Picks

Qiao

Xia

et al. 2019

Period. Polytech. Civil Eng.

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One of the key points in numerical simulation of coal-rock cutting by conical picks is to select a proper coal-rock constitutive model. In order to find a reasonable coal-rock constitutive model, a uniaxial compression test was conducted to obtain the constitutive model. The several stages for linear elastic deformation and creep, plastic yielding, hardening, and finally brittle cracking of the constitutive units were studied, and the coal-rock constitutive model was established. As a result, the coal-rock cutting by one conical pick or two conical picks was simulated and the results were compared with coal-rock cutting experiment on a Coal-rock Cutting Machine. According to the simulation and experimental results, it is believed that the numerical simulation can reveal coal-rock crushing process. And the total error rate of coal-rock cutting by one conical pick between the simulation and experiment is 8.5%. The maximum deviation of coal-rock cutting by two conical picks between the simulation and experiment is 9.8%. All simulation values are within a reasonable range. The comparison indicates that the coal-rock constitutive model should better be defined considering the coal-rock crushing process by conical picks.

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Section: Se W V Ttnmentioning

confidence: 99%

Establishment of Coal-rock Constitutive Models for Numerical Simulation of Coal-rock Cutting by Conical Picks

Qiao

Xia

et al. 2019

Period. Polytech. Civil Eng.

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“…A number of researchers discussed the effect of cutting speed before and it was reported that cutting speed has not a considerable effect during rock cutting, especially in low speeds (Nishimatsu 1972;Bilgin et al 2006Bilgin et al , 2012Copur et al 2017). He and Xu (2015) also analyzed it within the ranges of 4-20 mm/s and found that it is insignificant neither on tool forces nor on specific energy.…”

Section: Considerations About the Tool Forces And Specific Energymentioning

confidence: 99%

Tool Forces and Specific Energy Prediction Models in the Process of Sandstones Cutting by Using Conical Picks

Wang¹,

Wang²,

Su³

2018

Bilimsel Madencilik Dergisi

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In this study, unrelieved rock cutting experiments were conducted at the linear rock cutting machine and the characteristics of tool forces were discussed. The correlations among tool forces, specific energy, cutting depth, and rock strength were analyzed using single factor regression analysis method. Based on multiple non-linear regression method, the models of tool forces and specific energy were developed considering the rock strength and cutting depth. The results indicate that models of tool forces have the superior performance. When the model of specific energy is analyzed using the compressive strength of the rock, it was seen that the correlations are weak compared to the model related to tensile strength of rock. In conclusion, it is emphasized that the proposed models presented in this study are particularly recommended for performance prediction of soft and medium-hard strength sandstones in case conical picks are employed. ÖZ Bu çalışmada, doğrusal kesme setinde bağımsız kesme deneyleri yapılmış ve buna göre keski kuvvetlerinin karakteristiği tartışılmıştır. Tek faktörlü regresyon analiz yöntemi kullanılarak keski kuvvetleri, spesifik enerji, kesme derinliği ve kayacın dayanımı arasındaki ilişkiler analiz edilmiştir. Ayrıca, kayacın dayanımı ve kesme derinliği göz önüne alınarak doğrusal olmayan çoklu regresyon yöntemiyle keski kuvvetleri ve spesifik enerji modelleri geliştirilmiştir. Sonuçlar, kesme ve normal kuvvetleriyle ilgili tüm modellerin oldukça üstün olduğunu göstermiştir. Spesifik enerji ile basınç dayanımına bağlı olarak model kurulduğunda ilişki katsayılarının çekme dayanımına göre zayıf olduğu belirlenmiştir. Sonuç olarak, bu çalışmada sunulan modellerin yumuşak ve ortasert dayanımdaki kumtaşının kalem uçlu keski kullanılarak kazılması durumunda kullanımının önerilebileceği vurgulanmıştır.

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“…Furthermore, the cutting depth and confining stress could also change the rock failure mode and cutting performance of a conical pick. Hurt [6] tested conical picks with wedge angles of 76, 80 and 90º at a 45º attack angle, and they found that the yield of the rock was independent of the attack angle (between 40 and 55º) and that the cutting force was clearly affected by the wedge angle. Park [7] found that the specific energies were lower at an attack angle of 60° than at an attack angle of 45° for cutting depths of 4 and 6 mm.…”

Section: Introductionmentioning

confidence: 99%

Discrete Element Modeling of the Effects of Cutting Parameters and Rock Properties on Rock Fragmentation

2020

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Rock properties (e.g., brittleness, fracture toughness, hardness, compressive strength and tensile strength), cutting parameters (e.g., cutting depth, attack angle, wedge angle, cutting velocity) and confining stress are closely related to rock fragmentation behaviors in the design and application of excavation and mining machinery. To investigate the influence mechanism of those factors on rock fragmentation, a series of linear cutting numerical tests were conducted using the discrete element method. Numerical models with different rock mechanical parameters were calibrated by changing the cohesion strength-to-tensile strength ratio of the linear parallel bond model in PFC2D. The effects of cutting parameters on rock fragmentation were studied using orthogonal test and range analysis. The numerical results indicated that the strength ratio had a dominant effect on the specific energy and that the cutting depth and attack angle had a dominant effect on the mean cutting force. The cutting velocity significantly influenced the specific energy, and a higher cutting velocity should be adopted in actual rock cutting. In addition, a cutting force prediction model was proposed that considered factors such as the compressive strength, wedge angle, attack angle and cutting depth. Moreover, the introduction of more rock mechanical parameters into the evaluation indicators can reflect a greater number of fragmentation characteristics.

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Effects of Different Cutting Patterns and Experimental Conditions on the Performance of a Conical Drag Tool

Cited by 59 publications

References 12 publications

Establishment of Coal-rock Constitutive Models for Numerical Simulation of Coal-rock Cutting by Conical Picks

Establishment of Coal-rock Constitutive Models for Numerical Simulation of Coal-rock Cutting by Conical Picks

Tool Forces and Specific Energy Prediction Models in the Process of Sandstones Cutting by Using Conical Picks

Discrete Element Modeling of the Effects of Cutting Parameters and Rock Properties on Rock Fragmentation

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