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

Abstract

In order to overcome conical pick wear in the traditional rock cutting method, a new cutting method was proposed on account of increasing free surface of the rock. The mechanical model of rock plate bending under concentrated force was established, and the first fracture position was given. The comparison between experimental and numerical results indicated that the numerical method is effective. A computer code LS-DYNA (3D) was employed to study the cutting performance of a conical pick. To study the rock size influenced on the cutting performance, the numerical simulations with different thickness, width, and height of a rock plate was carried out. The numerical simulation with the different cutting parameters of cutting speed, cutting angle, and cutting position influenced on cutting performance was also carried out. The numerical results indicated that the peak force increased with the increasing thickness of rock plate. With the increasing width and height of the rock plate, the peak force decreased and then became stable. Besides, the peak force decreased with the increasing of cutting position lxp/lx. Moreover, the peak force increased and then decreased with the increasing of cutting angle. The cutting speed has nonsignificant influence on the peak force. The strong exponential relationship was obtained between the peak force and cutting position, thickness, height, and width of the rock plate at a confidence level of 0.95. A binomial relationship was observed between the peak force and cutting angel. The cutting force comparison between traditional rock cutting and rock plate cutting indicated that the new cutting method can effectively reduce peak cutting force.

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

“…After the saw blade slices the rock, the rock plate's formation is with three sides fixed and one side free. During the rock plate cutting process, it is likely to form the rock plate with two sides fixed and two sides free as is shown in Figure 1(b) [19]. e research content of the paper is mainly based on the rock plate with two sides fixed and two sides free.…”

“…Yang et al [18], by establishing rotary cutting model of point attack pick, demonstrated that lower rotary angle and higher cutting angle were beneficial for reducing pick wear. Lu et al [19][20][21] proposed a multi-free-surface-rockcutting method under different constraints and carried out a numerical simulation study on cutting force in crushing process. Jeong et al [22] used the smooth particle hydrodynamics (SPH) technique to build the rock and conical pick interaction mode and the Drucker-Prager model to simulate the brittle fracture.…”

Numerical Research on Cutting Force and Fracture Morphology of Rock Plate with Two Sides Fixed and Two Sides Free

“…On the premise of ignoring the chamfer, the rock plate is a rectangular plate with three sides constrained and one side free. In the process of rock plate cutting, it is very likely to form two sides constrained and two sides free rock plate [24]. e main research content of the paper is carried out on the basis of the rock plate with two sides fixed and two sides free.…”

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

“…Meanwhile, Yasar demonstrates that it is feasible to use small block sample to predict cutting force. Lu et al [18] conclude that cutting speed does not influence cutting force or fracture characteristics, after researching the fracture features of a free rock plate with three sides fixed and one side free. Pick wear is an important factor that influences cutting efficiency and production cost.…”