Abstract
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.
Highlights
Mechanical excavation is the most widely used rock excavation approach in the mining and civil industries [1]
E main cracks are located in the middle of rock plate as well as at the junction between rock plate and base rock. e numerical results are the same as the experimental results, which demonstrate that the numerical simulation is feasible
As the conical pick moves, the maximum bending moment is produced at the junction of base rock and rock plate, which leads to rock plate broken
Summary
Mechanical excavation is the most widely used rock excavation approach in the mining and civil industries [1]. E most classical theoretical study shows the cutting depth of conical pick and compressive and tensile strength of rock as the main parameter influencing cutting force [2]. Su [14] employs PFC 3D code to build the interaction model between cutter and rock and gives the relationship between rake angle and cutting depth. He demonstrates that the Nishimatsu theory is only suitable for hard rock. In order to reveal the wear mechanism of conical pick, Liu et al [25] propose finite element method to research cutting form and the characteristics of cutting force influencing pick wear. It is considered that the interference between the back of the pick and the rock is the main factor that causes wear of the pick
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