A study on rock cutting efficiency and structural stability of a point attack pick cutter by lab-scale linear cutting machine testing and finite element analysis

Park, Jin‐Young; Kang, Hoon; Lee, Jae‐Wook; Kim, Jong-Hyoung; Oh, Joo-Young; Cho, Jung-Woo; Rostami, Jamal; Kim, Hyun Deok

doi:10.1016/j.ijrmms.2018.01.034

Cited by 44 publications

(8 citation statements)

References 19 publications

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“…It has been shown that the cutting mode or setting a cut spacing significantly affects the cutting forces and specific energy [1,3,[7][8][9]. Moreover, it has been shown that the cutting forces and specific energy in unrelieved cutting mode have higher value than those in relieved cutting mode [3,[26][27][28]].…”

Section: Figurementioning

confidence: 99%

“…The important design parameters of mechanical excavators are the arrangement of cutting tools, thrust, torque, and rotational speed of the cutterhead. These design parameters should be estimated carefully by considering the effect of the cutting conditions (i.e., penetration depth (p), cut spacing (s), and cutting angle) on the cutting force, cutting efficiency, and mechanical stability of a machine [1,2].…”

Section: Introductionmentioning

confidence: 99%

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Rock Cutting Simulation of Point Attack Picks Using the Smooth Particle Hydrodynamics Technique and the Cumulative Damage Model

et al. 2020

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Various numerical methods have been used to simulate the rock cutting process. Numerical simulation is a useful tool for estimating the performance of a cutting tool and for understanding the mechanism of rock cutting and interaction between a cutting tool and the rock. These methods supplement the rock cutting test, which is commonly referred to as the linear cutting machine (LCM) test. Mechanical excavators, such as roadheaders, longwall shearers, and trenchers, generally use pick cutters as the cutting tool. In this study, a rock cutting simulation with a pick cutter was developed using the smooth particle hydrodynamics (SPH) technique, which is a mesh-free Lagrangian method. The Drucker–Prager (DP) strength model was used to simulate the brittle behavior of rock. The cumulative damage (CD) model was used to simulate the degraded fragmentation process of rock and the distinctive behavior of rock in the compression and tensile stress regions. In this study, an attempt was made to simulate sequential cutting by multiple pick cutters. The results showed that the numerical simulation matched the experimental results closely in terms of cutter forces, specific energy, and the fragmentation phenomenon. These results confirmed the applicability of the SPH technique in simulating the rock cutting process.

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Section: Figurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Rock Cutting Simulation of Point Attack Picks Using the Smooth Particle Hydrodynamics Technique and the Cumulative Damage Model

et al. 2020

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“…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. Li [8] suggested that a smaller wedge angle resulted in longer median cracks; however, a smaller wedge angle was unfavorable for the formation of lateral cracks and chippings.…”

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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“…Li et al [16,17] and Zhu et al [18] also used the 3D FEM to research the cutting performance of the conical pick, but the mechanism of rock fragmentation has not been mentioned. Park et al [19] used 3D FEM to study the structural stability and wear of the point attack pick in the rock cutting process. Lu et al [20] employed ANSYS/LS-DYNA to research the cutting force and fracture morphology in the rock plate cutting process; the cutting position and cutting angle influencing cutting performance were investigated, and the relationship between cutting force and the rock fracture process was given.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Studies on Rock Cutting with Saw Blade and Conical Pick Combined Cutting Method

Zeng

Wang

et al. 2019

Mathematical Problems in Engineering

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In the rock cutting process, conical pick wear is often encountered. In order to restrain this condition, a saw blades and conical pick combined cutting method was put forward. Saw blades were employed to slit the rock for increasing the free surface, and then the conical pick was used to break the rock. To research the cutting performance of the new cutting method, the corresponding experimental device and a three-dimensional finite element model are established. In order to obtain crack propagation and fragment separation and to study the fracture process of the rock plate, a damage constative model and failure mechanism were combined in the numerical model. The mechanical tests were carried out to achieve the mechanical parameters of the rock. To investigate different parameters affecting rock plate cutting performance, experiments with different compressive strengths, physical parameters, and cutting depths were carried out. Moreover, the confining pressures affecting the cutting performance were adopted to simulate deep mining conditions. The experimental results demonstrated that the peak cutting force shows the exponential positive correlation with compressive strength, thickness of the rock plate, and cutting depth of the conical pick, and exhibits the exponential positive correlation with rock plate height and width. Besides, the numerical simulation results show that peak cutting force and confining pressure have a binomial relationship.

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A study on rock cutting efficiency and structural stability of a point attack pick cutter by lab-scale linear cutting machine testing and finite element analysis

Cited by 44 publications

References 19 publications

Rock Cutting Simulation of Point Attack Picks Using the Smooth Particle Hydrodynamics Technique and the Cumulative Damage Model

Rock Cutting Simulation of Point Attack Picks Using the Smooth Particle Hydrodynamics Technique and the Cumulative Damage Model

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

Experimental and Numerical Studies on Rock Cutting with Saw Blade and Conical Pick Combined Cutting Method

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