CONICAL PICK FAILURE EFFECT ON ROCK CUTTING PROCESS CONDITIONS

2021 ◽  
pp. 114-124
Author(s):  
E. A. Averin ◽  
A. B. Zhabin ◽  
A. V. Polyakov ◽  
Yu. N. Linnik ◽  
V. Yu. Linnik
Keyword(s):  
Rock Cutting ◽  
Cutting Process ◽  
Process Conditions ◽  
Conical Pick

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

2018 ◽  
Vol 2018 ◽  
pp. 1-21 ◽  
Author(s):  
Zhenguo Lu ◽  
Lirong Wan ◽  
Qingliang Zeng ◽  
Xin Zhang ◽  
Kuidong Gao
Keyword(s):  
Numerical Simulation ◽  
Cutting Force ◽  
Cutting Speed ◽  
Rock Cutting ◽  
Numerical Results ◽  
Peak Force ◽  
Cutting Performance ◽  
Conical Pick ◽  
Cutting Method ◽  
Cutting Angle

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.

scholarly journals Optimization of the Cutting Process Parameters to Ensure High Efficiency of Drilling Tunnels and Use the Technical Potential of the Boom-Type Roadheader

Energies ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 6597
Author(s):  
Piotr Cheluszka
Keyword(s):  
Control System ◽  
Energy Consumption ◽  
Automatic Control ◽  
Automatic Control System ◽  
Process Parameters ◽  
High Efficiency ◽  
Rock Cutting ◽  
High Energy ◽  
Cutting Process ◽  
Underground Mines

This paper deals with the automation of the rock cutting process with roadheaders used widely in civil engineering for drilling roadways in underground mines and tunnels. Although there has been intensive technical development, roadheaders are still manually controlled. Manual control does not allow optimizing the values of the cutting process parameters, which often results in low mining efficiency, especially in the case of hard rocks, as well as high energy consumption and significant dynamic overloading of the roadheader. As part of theoretical and experimental research, an automatic control system was designed for the boom-type roadheader and an algorithm was developed for the optimal control of the cutting process parameters. Control criteria have been formulated, based on which the current values of the cutting process parameters are worked out using the information on the dynamic load state of the roadheader. The paper presents selected results of numerical tests conducted on roadheader dynamics, which simulated the automatic control system operation of the heading face cutting process of drilled roadway or tunnel. These tests were intended to analyze the behavior of the investigated object during simulated rock cutting in automatic mode. The results confirmed the possibility of a significant reduction in mining energy consumption.

scholarly journals Evaluation of gang saws’ performance in the carbonate rock cutting process using feasibility of intelligent approaches

2019 ◽  
Vol 22 (3) ◽  
pp. 990-1000 ◽  
Author(s):  
Alireza Dormishi ◽  
Mohammad Ataei ◽  
Reza Mikaeil ◽  
Reza Khalokakaei ◽  
Sina Shaffiee Haghshenas
Keyword(s):  
Carbonate Rock ◽  
Rock Cutting ◽  
Cutting Process

Modeling of PDC single cutter – Poroelastic effects in rock cutting process

2019 ◽  
Vol 183 ◽  
pp. 106389 ◽  
Author(s):  
Pengju Chen ◽  
Meng Meng ◽  
Rui Ren ◽  
Stefan Miska ◽  
Mengjiao Yu ◽  
...  
Keyword(s):  
Rock Cutting ◽  
Cutting Process

Ultraprecision Ductile-Regime Cutting of Optical Glass

2007 ◽  
Vol 364-366 ◽  
pp. 69-73 ◽  
Author(s):  
Ming Zhou ◽  
Ying Chun Liang ◽  
Shao Nan Huang
Keyword(s):  
Tool Wear ◽  
Optical Glass ◽  
Cutting Process ◽  
Process Conditions ◽  
Diamond Cutting ◽  
Machined Surface ◽  
Vibration Cutting ◽  
Tool Wear Mechanism ◽  
Cutting Zone ◽  
Zone Microstructure

Nano-indentation of glass SF11 was performed for understanding the material deformation behavior in practical cutting process. Diamond cutting tests under different process conditions, i.e. conventional turning and ultrasonic vibration assisted cutting, were also carried out. Cleavage and microchipping appear to be the dominant tool wear mechanism based on the analytical results of wear zone microstructure and machined surface topography. The change in the tribology of the cutting process as well as the alteration of the deformation mechanism of the work material in the cutting zone might be responsible for the reduction in tool wear in vibration cutting.

scholarly journals Discrete Element Simulation of Conical Pick’s Coal Cutting Process under Different Cutting Parameters

2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
Jinxia Liu ◽  
Chao Ma ◽  
Qingliang Zeng ◽  
Kuidong Gao
Keyword(s):  
Angular Velocity ◽  
Cutting Force ◽  
Cutting Parameters ◽  
Discrete Element ◽  
Cutting Process ◽  
Conical Pick ◽  
Force Fluctuation ◽  
Installation Angle ◽  
Coal Cutting ◽  
Coal Particles

To explore how the cutting parameters affect the conical pick’s cutting force in coal cutting process, some simulation tests were carried with EDEM based on analysis of coal cutting process of conical pick and micro mechanical characteristic of coal particles. In this paper, traction speed, drum angular velocity, and installation angle of conical pick were considered as the main coal cutting parameters. The discrete element simulations were conducted under 7 sets of various cutting parameters, which were determined in the range of empirical parameters. From the results of the simulation tests, it can be concluded that the fragmentation of coal particles appears in a compacted, squeezed, and crumbling state in coal cutting process; the traction speed has the greatest impact on the conical pick’s cutting force and cutting force fluctuation and the influence of drum angular velocity and installation angle reduce in turn; the force and force fluctuation tend to decrease and obviously increase, respectively, with the increase of drum angular velocity and traction speed; and they will reach the minimum when the pick’s installation angle is 45° under certain traction speed and drum angular velocity.

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