Numerical Studies on Chip Formation in Drag-Pick Cutting of Rocks

Loui, John P.; Karanam, U. M. Rao

doi:10.1007/s10706-011-9456-3

Cited by 22 publications

(8 citation statements)

References 21 publications

(32 reference statements)

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“…When the cutting depth and pulling force were constant, the stress intensity factor increased with the crack length. Therefore, it indicated that the crack would enter into the unstable fracture when the crack was initiated, and the phenomenon could be verified through the reacting force reduction after the peak point [23].…”

Section: Mechanical Analysis Of Rockmentioning

confidence: 93%

Theoretical Modeling of Rock Breakage by Hydraulic and Mechanical Tool

Jiang

Liu

et al. 2014

Mathematical Problems in Engineering

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Rock breakage by coupled mechanical and hydraulic action has been developed over the past several decades, but theoretical study on rock fragmentation by mechanical tool with water pressure assistance was still lacking. The theoretical model of rock breakage by mechanical tool was developed based on the rock fracture mechanics and the solution of Boussinesq’s problem, and it could explain the process of rock fragmentation as well as predicating the peak reacting force. The theoretical model of rock breakage by coupled mechanical and hydraulic action was developed according to the superposition principle of intensity factors at the crack tip, and the reacting force of mechanical tool assisted by hydraulic action could be reduced obviously if the crack with a critical length could be produced by mechanical or hydraulic impact. The experimental results indicated that the peak reacting force could be reduced about 15% assisted by medium water pressure, and quick reduction of reacting force after peak value decreased the specific energy consumption of rock fragmentation by mechanical tool. The crack formation by mechanical or hydraulic impact was the prerequisite to improvement of the ability of combined breakage.

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Section: Mechanical Analysis Of Rockmentioning

confidence: 93%

Theoretical Modeling of Rock Breakage by Hydraulic and Mechanical Tool

Jiang

Liu

et al. 2014

Mathematical Problems in Engineering

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“…However, crack propagation and chip separation were not obviously. Meanwhile, two-dimensional discrete element method (DEM 2D) method is also poor in simulating chip separation [26,27], although cracks can be obtained. Stavropoulou [28] and Innauratoetal et al [29] employed finite difference method (FDM) to investigate the chip formation in the rock and cutting tool interaction process and the satisfactory results were achieved.…”

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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“…During rock fragmentation, the cutting force is not only affected by friction and cutting speed, but also by mechanical properties of the rock and tool angle [16], [17]. In the process of breaking hard rock, the increase of cutting force is the main cause of tool failure and low cutting efficiency [18]. In addition, The cutting forces and chip morphology were significantly influenced by sliding velocities and cutting depths [19], [20].…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional Numerical Simulation of Rock Breaking by the Tipped Hob Cutter Based on Explicit Finite Element

Liu

et al. 2019

IEEE Access

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As an important equipment for wellbore construction, the raise boring machine (RBM) has been widely used in subway tunnels and mine construction projects. Its tipped hob cutter for rock breaking is directly related to the cost, safety, and overall performance of the project. However, few open studies research on the rock-breaking by the tipped hob cutter, and there is still a lack of enough understanding of how the cutter breaks rock and the form of the rock breaking. In this paper, we study how the tipped hob cutter breaks the rock, and how to establish the finite-element model of the rock breaking by the cutter, with using the numerical simulation software LS-DYNA to analyze the rolling process and rock fracture form of the cutter. By studying the fracture morphology of rocks, it is proposed that there are three fracture modes of rock breaking: forward slip, no slip, and backward slip, using the experimental verification. On this basis, study the variation laws and correlations of feed force, lateral force, and positive force under different moving speeds and penetration depths. The results in this paper can provide a theoretical basis for improving the tool design of the tipped hob cutter on the RBM against the efficiency of rock-breaking. INDEX TERMS Tipped hob cutter, raise boring machine, rock fragmentation, slip crushing, numerical simulation. The associate editor coordinating the review of this manuscript and approving it for publication was Jiansong Liu.

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Numerical Studies on Chip Formation in Drag-Pick Cutting of Rocks

Cited by 22 publications

References 21 publications

Theoretical Modeling of Rock Breakage by Hydraulic and Mechanical Tool

Theoretical Modeling of Rock Breakage by Hydraulic and Mechanical Tool

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

Three-Dimensional Numerical Simulation of Rock Breaking by the Tipped Hob Cutter Based on Explicit Finite Element

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