Experimental research on wear of conical pick interacting with coal-rock

Liu, Songyong; Ji, Huifu; Liu, Xiaohui; Jiang, Haifeng

doi:10.1016/j.engfailanal.2017.01.013

Cited by 57 publications

(13 citation statements)

References 17 publications

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“…However, the driving speed of the rock roadway and semicoal rock roadway lags behind the mining speed of coal obviously, which is restricting the mining speed of coal and affects the safety of coal mining. Due to the limitation of the tool material, tool wear seriously and rock breaking efficiency are low while breaking the hard rock, and too many researchers studied that [22,23]. In order to overcome the problem that the wear of pick seriously restricts the driving speed of hard rock, method of rock breaking by combination of diamond sawblade and conical pick was put forward to improve the driving ability of driving equipment, as displayed in Figure 1(a).…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Conical Pick Cutting Arc Rock Plate Fracture Based on ANSYS/LS‐DYNA

Wang

Zeng

et al. 2020

Advances in Materials Science and Engineering

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The new method of rock breaking based on the combination of circular sawblade and conical pick was proposed to improve the effectiveness of hard rock breaking. The numerical simulation method was applied to research the conical pick cutting arc rock plate by ANSYS/LS-DYNA. The conical pick cutting arc rock plate numerical simulation model was established to research the influence of arc rock plate structural parameters and cutting parameters on cracks formation and propagation of the arc rock plate and the cutting force in the process of conical pick cutting arc rock plate. The amount of cracks is positively correlated with arc rock plate thickness, the cutting speed, and distance of cutting point to arc rock plate central axis and negatively correlated with the cutting angle. The mean peak cutting force is positively correlated with the thickness of arc rock plate and the distance of cutting point to arc rock plate central axis; however, it is negatively correlated with the arc rock plate height and width and cutting angle of conical pick. The simulation results can be used to predict the conical pick work performance with various cutting parameters and structural parameters.

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Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Conical Pick Cutting Arc Rock Plate Fracture Based on ANSYS/LS‐DYNA

Wang

Zeng

et al. 2020

Advances in Materials Science and Engineering

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“…In numerical studies of picks, the main methods are the finite-element method (FEM) [11][12][13] and the discrete-element method [14][15][16]. In pick experiments, different testbeds have been established, such as the coal-rock cutting testbed [17,18] and automated rotary coal/rock cutting simulator (ARCCS) testbed [19][20][21] used for rotary cutting, the single-pick testbed [22,23], the fullscale cutting testbed [24,25] and some modified test devices [26,27]. Research attention is now turning to pick failure.…”

Section: Introductionmentioning

confidence: 99%

Effect of contact characteristics on the self-rotation performance of conical picks based on impact dynamics modelling

Liu

Geng

2020

R. Soc. open sci.

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Conical picks have a harsh working environment and 70% of their failures are caused by wear. It has been found that conical picks can rotate while interacting with the working material. This self-rotation ability is an important factor affecting pick wear, but the self-rotation mechanism remains unclear. Researching the mechanism involves the impact and friction dynamics of the interaction between a pick and its holder. Thus, a dynamic finite-element numerical model for the pick–holder interaction is established. How the handle–holder gap width, pick body and handle lengths and pick handle diameter affect the settling time and the percentage of time with no contact is studied to compare the numerical results with the equivalent effects on the rotation angle in experiments. Doing so indicates that the main factor in the self-rotation ability of a conical pick is not the magnitude of the contact load but its duration. The present research provides a new method for revealing the mechanism for the self-rotation of conical picks.

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“…Conical picks work usually under high impact and stress conditions, resulting in frequent failure. The failure modes include premature wear, carbide tip drop off, fracture, and normal wear [1][2][3][4][5][6][7]. In order to understand the cutting properties of a pick, researchers have carried out substantial experimental work on pick cutting force prediction.…”

Section: Introductionmentioning

confidence: 99%

“…Studies have examined the relationship of the amount of wear represented by the size of wear flats at the tip of bits, cutting forces, and specific energy [5]. Liu also investigated the influence of pick cutting types, structures, and working angle parameters on pick wear, and the effect of wear on the pick cutting performance, by using an experimental apparatus to cut coal rock [6]. Bilgin et al [8] carried out full-scale linear cutting tests, with different cutting depths and cut spacing, to study the conical pick performance on 22 different rock specimens, having compressive strength varying from 10 to 170 MPa.…”

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confidence: 99%

A Stress Analysis of a Conical Pick by Establishing a 3D ES-FEM Model and Using Experimental Measured Forces

2019

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This paper presents a procedure for an accurate and reliable stress analysis in a conical pick used in mining operations, aiming to improve their wear resistance. This is achieved by (1) establishment of a three-dimensional (3D) edge-based smoothed finite element method (ES-FEM), and algorithms of creating the smoothing domain for accurate solution in terms of stress and strain distributions; and (2) use of experimentally measured actual forces using a full-scale rotary cutting machine. In our 3D ES-FEM model, the physical domain for the pick is first discredited using linear triangular elements that can be generated easily for complicated geometries. The smoothing domains are then constructed based on edges of these elements in an automated fashion. In order to create the smoothing domains for the smoothed strain computation in the ES-FEM, an algorithm is presented for establishing connection between nodes, edges, faces, and elements. Each smoothing domain is bounded by a set of enclosed line-segments, besides, leading to a connectivity list for later effective computation. To show the effectiveness and accuracy of the strain energy and the displacement solution of ES-FEM, based on the actually measured forces from the laboratory rock cutting tests with a single pick, a comparison study is carried out against the standard finite element method (FEM). It can be concluded that ES-FEM has a higher convergence in energy norm and better accuracy than FEM using the same mesh from the comparison results. The 3D ES-FEM model solves the problem of the lower solution accuracy, caused by the poor quality of mesh, by using the standard FEM in solving the stress distribution of mining machinery parts, such as picks, and offers accurate and reliable solutions that are critical for improving the wear resistance of the pick for the mining industry.Experimental studies were performed to obtain the cutting performance parameters of conical picks, such as the pick force and wear influenced by cutting parameters and rock properties. Full-scale cutting tests in different types of sedimentary rocks, with bits having various degrees of wear, have been conducted to evaluate the influence of bit wear on cutting forces and specific energy. Studies have examined the relationship of the amount of wear represented by the size of wear flats at the tip of bits, cutting forces, and specific energy [5]. Liu also investigated the influence of pick cutting types, structures, and working angle parameters on pick wear, and the effect of wear on the pick cutting performance, by using an experimental apparatus to cut coal rock [6]. Bilgin et al. [8] carried out full-scale linear cutting tests, with different cutting depths and cut spacing, to study the conical pick performance on 22 different rock specimens, having compressive strength varying from 10 to 170 MPa. They found that the pick force and specific energy are positively correlated with rock properties, especially the uniaxial compressive strength and Brazilian tensile strength. Dewangan et a...

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Experimental research on wear of conical pick interacting with coal-rock

Cited by 57 publications

References 17 publications

Numerical Simulation of Conical Pick Cutting Arc Rock Plate Fracture Based on ANSYS/LS‐DYNA

Numerical Simulation of Conical Pick Cutting Arc Rock Plate Fracture Based on ANSYS/LS‐DYNA

Effect of contact characteristics on the self-rotation performance of conical picks based on impact dynamics modelling

A Stress Analysis of a Conical Pick by Establishing a 3D ES-FEM Model and Using Experimental Measured Forces

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