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

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.

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

scholarly journals New Computer Simulation Procedure of Heading Face Mining Process with Transverse Cutting Heads for Roadheader Automation

2017 ◽  
Vol 62 (1) ◽  
pp. 83-104 ◽  
Author(s):  
Marian Dolipski ◽  
Piotr Cheluszka ◽  
Piotr Sobota ◽  
Eryk Remiorz
Keyword(s):  
Underground Mining ◽  
Rock Cutting ◽  
Operating Conditions ◽  
Cutting Process ◽  
Experimental Investigations ◽  
Technical Parameters ◽  
Rock Mining ◽  
Conical Picks ◽  
Actual Shape ◽  
Cutting Path

Abstract The key working process carried out by roadheaders is rock mining. For this reason, the mathematical modelling of the mining process is underlying the prediction of a dynamic load on the main components of a roadheader, the prediction of power demand for rock cutting with given properties or the prediction of energy consumption of this process. The theoretical and experimental investigations conducted point out – especially in relation to the technical parameters of roadheaders used these days in underground mining and their operating conditions – that the mathematical models of the process employed to date have many limitations, and in many cases the results obtained using such models deviate largely from the reality. This is due to the fact that certain factors strongly influencing cutting process progress have not been considered at the modelling stage, or have been approached in an oversimplified fashion. The article presents a new model of a rock cutting process using conical picks of cutting heads of boom-type roadheaders. An important novelty with respect to the models applied to date is, firstly, that the actual shape of cuts has been modelled with such shape resulting from the geometry of the currently used conical picks, and, secondly, variations in the depth of cuts in the cutting path of individual picks have been considered with such variations resulting from the picks’ kinematics during the advancement of transverse cutting heads parallel to the floor surface. The work presents examples of simulation results for mining with a roadheader’s transverse head equipped with 80 conical picks and compares them with the outcomes obtained using the existing model.

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

2020 ◽  
Vol 10 (15) ◽  
pp. 5314
Author(s):  
Hoyoung Jeong ◽  
Seungbeom Choi ◽  
Sudeuk Lee ◽  
Seokwon Jeon
Keyword(s):  
Numerical Simulation ◽  
Cutting Tool ◽  
Damage Model ◽  
Rock Cutting ◽  
Cumulative Damage ◽  
Cutting Process ◽  
Smooth Particle Hydrodynamics ◽  
Cutting Simulation ◽  
Brittle Behavior ◽  
Particle Hydrodynamics

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.

scholarly journals Interrelationships between Acoustic Emission and Cutting Force in Rock Cutting

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Sifei Liu ◽  
Peng Shi ◽  
Zhijun Wan ◽  
Shuaifeng Lu ◽  
Jiakun Lv ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Fractal Dimension ◽  
Cutting Force ◽  
Intelligent Control ◽  
Rock Cutting ◽  
Cutting Process ◽  
Structure Stability ◽  
Whole Process ◽  
Ae Energy ◽  
Precursor Information

Cutting force is the key signal to realize intelligent control of shearer and mastering the change process of cutting force is helpful to improve the adaptive cutting of shearer. In this paper, full scale rock cutting tests are used to carry out single pick cutting experiments on three kinds of coal, and the acoustic emission (AE) signals of coal and rock cutting are monitored in the whole process. The relationship between AE and cutting force is also discussed. The results show that the development of AE energy can represent the different stages of the cutting process, and the time fractal dimension of AE energy can reveal the change law of coal structure stability. In addition, the acoustic emission waveform at the peak cutting force of the same kind of coal has the same main frequency, power spectrum density (PSD) variation law, and the area under PSD curve; for different types of coal, the area under PSD curve at peak cutting force increases with the increase of USC. In the cutting process, the AE signal has obvious characteristics and internal evolution law in energy amplitude, fractal dimension, and PSD index. The change characteristics of AE energy can be used as the precursor information of the peak cutting force, and the coal failure at the peak cutting force has the identity. The above conclusions are of great significance for intelligent control of shearer and intelligent mining of coal mine.

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