A General Semi-Theoretical Model for Conical Picks

Yasar, Serdar

doi:10.1007/s00603-020-02078-3

Cited by 22 publications

(12 citation statements)

References 23 publications

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“…In the traditional rock breaking mode of continuous coal and rock, the cutting force required for breaking limestone is 29.4 kN when the cutting depth is 9 mm. According to [32], the ratio of peak cutting force to mean cutting force is 2.45 kN. e peak cutting force for limestone cutting should be 72.03 kN, which is far greater than that of 5.646 kN when the granite thickness is 30 mm.…”

Section: Advantages Of the Methodmentioning

confidence: 99%

Research on Cutting Characteristics of Rock Plate with Two Sides Fixed and Two Sides Free

Zeng

Liu

et al. 2020

Advances in Materials Science and Engineering

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Conical pick wear is an urgent problem in the roadway excavation caused by hard rock difficult to break. The traditional method of increasing cutting power to improve cutting performance of conical pick significantly increases pick wear. In the paper, a saw blade and conical pick combined cutting method is proposed based on increased free surface. To research the fracture morphology and cutting force of rock plate, theoretical, numerical, and experimental methods are used. By theoretical research, the bending mechanical model of rock plate bending is established. The cutting position and the junction between the free sides and fixed sides are preferentially broken. A numerical model combining the erosion and damage constitutive model is built, and the cutting process of rock plate was presented. According to rock plate experiment, the peak cutting force increases with the increasing uniaxial compressive strength, thickness of rock plate, and cutting depth of conical pick and decreases with the increasing width and height of rock plate. Exponential relationships exist between peak cutting force and thickness, width and height of rock plate, and cutting depth of conical pick. Linear relationship exists between peak cutting force and uniaxial compressive strength. The size of rock fragments increases with uniaxial compressive strength, width, and height of rock plate.

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Section: Advantages Of the Methodmentioning

confidence: 99%

Research on Cutting Characteristics of Rock Plate with Two Sides Fixed and Two Sides Free

Zeng

Liu

et al. 2020

Advances in Materials Science and Engineering

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“…Authors of [6] introduced a theoretical-empirical cutting approach, where the interaction between the rock and the cutting tool is highlighted in a zero-degree angle cutting scenario. In the study [7], a detailed comparative analysis of the cutting force was conducted in the case of conical pick cutting mechanisms, based on nearly 200 test results of several different rock materials. Numerous studies using linear cutting machines (LCM) were conducted to evaluate parameters of excavating machines.…”

Section: Introductionmentioning

confidence: 99%

Determination of the Bucket Wheel Drive Power by Computer Modeling Based on Specific Energy Consumption and Cutting Geometry

et al. 2021

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Starting from the general principles of material cutting, with applicability to coal and overburden excavation using bucket wheel excavators (BWEs), this paper proposes another method for calculating the drive power of the bucket wheel excavator by computer modeling. This approach required two steps. In the first step, the volume of the excavated material for one slewing movement of the boom and for a particular excavation geometry was determined, and the slewing time in the open pit coal mine was measured. In the second one, the values of the specific energy (SE) consumption for cutting were determined by laboratory tests on samples of material taken from the open pit mine. The proposed method allows for the estimation of the load of the bucket wheel drive motor by taking into account only the specific energy necessary for the cutting of the material, the excavated volume during one slewing, and the time required to excavate this volume, and not the wear coefficients of the teeth or bucket edge. This method is important for establishing the correlation between the height of the excavated slice and the slewing speed of the boom in order to optimize the drive power of the bucket wheel and thus improve energy efficiency, increase the performance of excavators, and reduce operating costs.

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“…Wang and Su [15] point out that the maximum volume of rock fragment is proportional to cutting depth and that the specific energy decreases exponentially with the increase of cutting depth. Yasar [16,17] points out that there are inherent defects in the traditional theoretical model. Test results of different rocks show that semitheoretical model of rock cutting can better reflect the actual situation.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation on Cutting and Fracturing of Rock Plate with One Side Fixed and Three Sides Free

Zeng

Meng

et al. 2020

Advances in Materials Science and Engineering

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Conical pick is a rock cutting tool that is commonly used in roadway driving. Pick wear frequently happens in the course of breaking hard rock. The current paper shows a new method to solve the problem of pick wear. The rock is preslit with the saw blade and then broken by the conical pick. In order to study the cutting force and features of rock fragment, the numerical model is built between rock plate and conical pick. And element erosion is added in the code to obtain the fracture result. The rock plate cutting testbed is made to testify the correctness of numerical simulation. The width, height, and thickness of the rock plate, as well as cutting angle and cutting position, which influence cutting force and rock fracture are studied. According to the results, there exist exponential relationships between cutting force and width and thickness of rock plate. In addition, a linear relationship is found between the cutting force and the height of rock plate. Furthermore, both the cutting angle and cutting depth have an influence on cutting force. In particular, the factors of thickness and height or rock plate have the most obvious influence on cutting force. It is proven that what is beneficial to rock fracture is higher height and lower thickness of rock plate.

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A General Semi-Theoretical Model for Conical Picks

Cited by 22 publications

References 23 publications

Research on Cutting Characteristics of Rock Plate with Two Sides Fixed and Two Sides Free

Research on Cutting Characteristics of Rock Plate with Two Sides Fixed and Two Sides Free

Determination of the Bucket Wheel Drive Power by Computer Modeling Based on Specific Energy Consumption and Cutting Geometry

Numerical Simulation on Cutting and Fracturing of Rock Plate with One Side Fixed and Three Sides Free

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