Effect of skew angle on the cutting performance and cutting stability of point-attack type picks

Jeong, Hoyoung; Choi, Seungbeom; Jeon, Seokwon

doi:10.1016/j.tust.2020.103507

Cited by 4 publications

(2 citation statements)

References 19 publications

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“…Therefore, the traditional pick arrangement method for the drum is not suitable for the design and analysis of the cutting head with a complex spatial structure [ 6 – 8 ]. The pick spatial position and attitude are the main factors affecting pick consumption and rock cutting performance for the cutting head [ 9 – 13 ]. When the characteristic size of the cutting head is confirmed, the pick spatial position can be determined by the two parameters of the helix shape and the cutting line spacing [ 14 – 16 ].…”

Section: Introductionmentioning

confidence: 99%

A new method for roadheader pick arrangement based on meshing pick spatial position and rock cutting verification

Zhang

Yan

Qin³

2021

PLoS ONE

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This paper proposes a cutting head optimization method based on meshing the spatial position of the picks. According to the expanded shape of the spatial mesh composed of four adjacent picks on the plane, a standard mesh shape analysis method can be established with mesh skewness, mesh symmetry, and mesh area ratio as the indicators. The traversal algorithm is used to calculate the theoretical meshing rate, pick rotation coefficient, and the variation of cutting load for the longitudinal cutting head with 2, 3, and 4 helices. The results show that the 3-helix longitudinal cutting head has better performance. By using the traversal result with maximum theoretical meshing rate as the design parameter, the longitudinal cutting head CH51 with 51 picks was designed and analyzed. The prediction model of pick consumption is established based on cutting speed, direct rock cutting volume of each pick, pick rotation coefficient, uniaxial compressive strength, and CERCHAR abrasivity index. And the rock with normal distribution characteristics of Uniaxial Compressive Strength is used for the specific energy calculating. The artificial rock wall cutting test results show that the reduction in height loss suppresses the increase in pick equivalent loss caused by the increase in mass loss, and the pick consumption in this test is only 0.037–0.054 picks/m3. In addition, the correlation between the actual pick consumption and the prediction model, and the correlation between the actual cutting specific energy and the theoretical calculation value are also analyzed. The research results show that the pick arrangement design method based on meshing pick tip spatial position can effectively reduce pick consumption and improve the rock cutting performance.

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Section: Introductionmentioning

confidence: 99%

A new method for roadheader pick arrangement based on meshing pick spatial position and rock cutting verification

Zhang

Yan

Qin³

2021

PLoS ONE

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“…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%

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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A prediction model for specific energy required by point attack picks based on a hybrid evolutionary machine learning technique

et al. 2022

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Effect of skew angle on the cutting performance and cutting stability of point-attack type picks

Cited by 4 publications

References 19 publications

A new method for roadheader pick arrangement based on meshing pick spatial position and rock cutting verification

A new method for roadheader pick arrangement based on meshing pick spatial position and rock cutting verification

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

A prediction model for specific energy required by point attack picks based on a hybrid evolutionary machine learning technique

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