scholarly journals Determination of contact temperature on cutting disc during rock destruction

2020 ◽  
Vol 174 ◽  
pp. 03005
Author(s):  
Vladimir Kuznetsov ◽  
Elena Preis ◽  
Kirill Ananyev ◽  
Aleksander Ermakov
Keyword(s):  
Disc Cutter ◽  
Water Cooling ◽  
Cutting Depth ◽  
Rock Destruction ◽  
Disc Cutters ◽  
Geological Conditions ◽  
Increase Wear Resistance ◽  
Forced Cooling ◽  
Destruction Of Rocks

During the destruction of rocks by disc cutters the question of their operation without water cooling is arising. To implement this an approach to determining the temperature of the disk cutter is considered in the article. The calculations of heating of the disc cutter with various geometric parameters (diameter, sharpening angles, blunting edge radius) and geological conditions under different cutting conditions (cutting depth) are presented. The disc cutter temperature and comparison with a critical one is given. The results allow to increase wear resistance and thereby determine the modes of operation in which forced cooling of the cutting disc is not required.

scholarly journals FOREIGN EXPERIENCE OF THE USE OF V-TYPE DISC CUTTERS IN TUNNELING AS A REFERENCE POINT FOR PROSPECTIVE STUDIES IN RUSSIA

2018 ◽  
pp. 41-50
Author(s):  
E. A. Averin
Keyword(s):  
Cutting Tools ◽  
Small Diameter ◽  
Field Tests ◽  
Texture Features ◽  
Energy Performance ◽  
Disc Cutter ◽  
Rock Destruction ◽  
Foreign Experience ◽  
Disc Cutters ◽  
Wide Range

Equipping of TBMs with rock cutting tools in the modern foreign practice of tunneling is based on the usage of CCS-type disc cutters. But there is also another type of tool for rock destruction when tunneling. It is a V-type disc cutter. As practice shows, in some situations it can provide greater work efficiency than a standard tool. Domestic research in this direction is mainly limited to the study of V-type tools of relatively small diameter for equipping roadheaders. Thus, this experience cannot be applied, if necessary, to the tunneling operations with TBM. Therefore, the studying of foreign experience on this issue is advisable. The paper analyzes studies conducted by foreign experts in the process of tunneling for various purposes in Turkey in the first decade of this century. These studies include the determination of a wide range of physical and technical properties of rocks, laboratory and field tests to determine the strength characteristics of the rock destruction process, comparison of laboratory, field and theoretical values of forces and energy performance of TBMs. As a result of the tests, it was found that the effectiveness of rock destruction is determined not only by their strength, but also by struc-tural and texture features. Differences were also observed when comparing laboratory experiments with field data, and comparing laboratory and full-scale force values on disc cutters in the process of rock destruction with theoretical values. In addition, the prospective areas of application of V-type disk cutters include the destruction of viscous non-abrasive rocks with a small amount of mineral inclusions or, with some reservations, the destruction of very hard and abrasive rocks. Not all conclusions made on the basis of the analysis performed coincide with the opinions of the authors of the initial studies, therefore, for a more complete understanding of the topic, it is recommended to read the literature (especially foreign literature) from the list of quoted sources.

Improving the Efficiency of Rock Destruction Tools when Drilling Wells in difficult Mining and Geological Conditions

2021 ◽  
Vol 9 (3) ◽  
pp. 198-202
Keyword(s):  
Temperature Regime ◽  
Cutting Tool ◽  
Cutting Tools ◽  
Experimental Studies ◽  
Rock Cutting ◽  
Rock Destruction ◽  
Bottom Hole ◽  
Geological Conditions ◽  
Difficult Terrain ◽  
Forced Cooling

Air blast drilling is effective in the most unfavorable conditions for liquid flushing: when drilling in areas with significant circulation losses, when there are difficulties with water supply, in high mountainous or difficult terrain, or in areas with harsh climates. However, air has a low heat capacity compared to liquid flushing solutions, this affects the operation of rock cutting tools through high contact temperatures with irreversible consequences such as deformation of matrices, destruction of diamonds, grinding, reduction of diamond hardness and tool burns. To prevent these problems, there is a need to develop technical means and technology to effectively ensure the temperature regime of the rock-cutting tool. This article discusses the possibility of normalizing and regulating the temperature regime of the rock-cutting tool due to forced cooling of the cleaning air at the bottom hole to negative temperatures, and a new design of the drilling projectile for drilling with air purging is developed. The results of experimental studies of the developed design of the drilling projectile are also presented.

Determination of the rock destruction depth by PDC cutters with account of the medium resistance

2020 ◽  
pp. 23-27
Author(s):  
V.V. Neskoromnykh ◽  
◽  
M.S. Popova ◽  
A.V. Chikhotkin ◽  
A.E. Golovchenko ◽  
...  
Keyword(s):  
Rock Destruction ◽  
Medium Resistance

Grapho-Analytical Determination of the Profile Disc Tool for Manufacturing of Complex Helicoidal Surfaces

2013 ◽  
Vol 837 ◽  
pp. 164-169 ◽  
Author(s):  
Gheorghe Pleşu
Keyword(s):  
Point Of View ◽  
Disc Cutter ◽  
Analytical Determination ◽  
Great Effort ◽  
Numerical Determination ◽  
Projection System ◽  
Tool Profile ◽  
Helicoidal Surfaces ◽  
Helicoidal Surface

Helicoidal surfaces correspond to a cathegory of widely spread surfacesin the technical field. From the point of view of the manufacturing of helicoidal surfaces through the moving of a profile around the helix, the two elements defining such a surface can be distinguished: the profile and the helix. The numerical determination of the profile of the disc type tool drawn on an analytical method with a large number of points [1- (the number reaches even 1500 in some cases) implies a great effort so that the technician can verify the correctness of results, even in the present case when there is the possibility of the numerical determination through the resolution of the inverse problem of the frontal profile of the complex helicoidal surface. In order to facilitate this work and to give the possibility of introducing some new profiles in the projection system, some methods of grapho-analytical determination have been conceived to process the profiles of the complex helicoidal surfaces, as well as the profiles of the helicoidal surfaces for a given tool profile. This paper presents the graphic-analytical determination of the disc tool profile designed to dress the complex helicoidal surfaces. The methods referred to by using the possibilities provided by the programming environment AutoCAD and its development languages allow to determin numerically the profile of the disc-cutter with a high precision, above the precision level required in practice.

Specific Features of Blasting Operations in Mining Minerals in Northern and Arctic Regions of Russia

2021 ◽  
pp. 102-106
Author(s):  
V.A. Tikhonov ◽  
G.A. Dudnik ◽  
S.Yu. Panfilov ◽  
V.V. Zhulikov
Keyword(s):  
Size Composition ◽  
The Arctic ◽  
Physical Parameters ◽  
Arctic Zone ◽  
Arctic Regions ◽  
Priority Task ◽  
Geological Conditions ◽  
The Russian Federation ◽  
Remote Operations

A priority task for facilitating the development of the Arctic zone of the Russian Federation is to design new blasting technologies to be efficiently used in extremely difficult climatic, mining and geological conditions at remote operations. This is further motivated by the fact that up to 40% of Russia's gold reserves, 60–90% of its natural gas resources and 100% of its primary diamond deposits are located in the Arctic zone. The article analyses the problems of blasting operations while developing deposits in the Arctic zone. The main formulations of ordinary explosives are reviewed that allow to solve a number of challenges associated with blasting operations in remote and hard-to-reach Arctic regions. Based on the performed analysis of existing methods, further areas of research are identified that can improve the quality and safety of blasting operations: 1) determination of optimum weight and dimensions of boosters based on ordinary explosives depending on the initiating borehole size; 2) determination of the relation between the particle size / composition of the booster and the detonation velocity; 3) determination of physical parameters of transition from deflagration to detonation and gaining sensitivity to the initiating pulse from the detonator cap by the ordinary explosive compositions.

scholarly journals Multiobjective Optimization Design for Structural Parameters of TBM Disc Cutter Rings Based on FAHP and SAMPGA

2019 ◽  
Vol 2019 ◽  
pp. 1-13 ◽  
Author(s):  
Laikuang Lin ◽  
Yimin Xia ◽  
Dun Wu
Keyword(s):  
Multiobjective Optimization ◽  
Optimization Design ◽  
Structural Parameters ◽  
Rock Breaking ◽  
Ring Structure ◽  
Structure Design ◽  
Disc Cutter ◽  
Load Bearing ◽  
Geological Conditions ◽  
Weight Coefficients

As a key component of tunnel boring machines (TBMs), the disc cutter ring and its structural parameters are closely related to the TBM tunneling quality. Literature review shows that investigations on optimization design methods for cutter ring structure are seriously insufficient. Therefore, in this paper, a multiobjective optimization design model of structural parameters for disc cutter rings is developed based on the complex geological conditions and the corresponding cutter ring structure design requirements. The rock breaking capability, energy consumption, load-bearing capability, wear life, and wear uniformity of disc cutter are selected as the objectives, and the geometric structure of cutter rings, ultimate load-bearing capability, and cutterhead drive performance are determined as constraints. According to the characteristics of this model, a self-adaptive multipopulation genetic algorithm (SAMPGA) is utilized to solve the optimization problem, and the Fuzzy analytical hierarchy process (FAHP) is employed to calculate weight coefficients for multiple objectives. Finally, the applicability of the proposed method is demonstrated through a case study in a TBM project. The results indicated that the rock breaking performance and service life of the disc cutter are improved after optimization by using the proposed method. The utilization of SAMPGA effectively solves the premature local convergence problems during optimization. The geological adaptability should be considered in the cutter ring structure design, which can be realized by using the proposed method based on the suitable weight coefficients.

scholarly journals Determination of the transfer step of the ore chute while mining the technogenic deposit of the bulk type

2020 ◽  
Vol 166 ◽  
pp. 02004
Author(s):  
Volodymyr Peregudov ◽  
Ihor Hryhoriev ◽  
Serhii Joukov ◽  
Yulian Hryhoriev
Keyword(s):  
Raw Materials ◽  
Mining Industry ◽  
Process Conditions ◽  
Geological Conditions ◽  
Scientific Task ◽  
Technogenic Deposit ◽  
Mining Works ◽  
The Cost

Further development of the open mining works on the domestic enterprises will be accompanied by the worsening of mining-geological conditions and declining of the quality of iron ore raw materials. In the same time, the accumulated mining wastes, that can make the technogenic deposits, pass into one of the important sources of the mineral raw materials. Taking into account this thing, the development and implementation of the modern technological circuits of the technogenic deposit development is an actual calling for mining industry, and determination and optimization of process conditions of the technogenic deposit development – is the scientific task of this publication. The obtained results of studies of the optimum step value of the ore chute transfer during the technogenic deposit development can be used by design organizations and mining enterprises for designing works. The obtained methodology and the proposed mathematical dependencies will reduce the cost of mining of the technogenic deposit due to the reasonable timely transfer of the open ore chute.

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