Peculiarities of stress field formation during cutting isotropic material by mining machine cutters

Gabov, V. V.; Задков, Д. А.

doi:10.1088/1755-1315/87/2/022007

Cited by 6 publications

(5 citation statements)

References 2 publications

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“…At the same time, the standards imposed on operating conditions and maintenance of such equipment are very high. It also should be mentioned that the mining technology and equipment are being persistently improved [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25].…”

Section: Modern Trends In Drivage Technology and Equipmentmentioning

confidence: 99%

Reproduction of the longwall panels: modern requirements for the technology and organization of the development operations at coal mines

Kazanin¹,

Sidorenko²,

Sidorenko³

et al. 2020

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The authors point at the criticality of timely reproduction of longwall panels in coal mines toward sustainable and high-rate coal mining based on the utilization potential of modern longwall equipment. A case-study of SUEK-Kuzbass mines shows that there is a need to change approaches to improvement of economic efficiency and competitiveness of coal mining and to shift from the common practice of production cost reduction to productivity enhancement through implementation of high-performance equipment capabilities. Efficiency of road heading in mines of SUEK-Kuzbass is analyzed, and the main causes of long downtime in operation of modern high-performance continuous miners (CM) or continuous bolter miners (CBM) are identified. Recommendations have been developed for improved planning of preparatory works in mines and for introduction of significant action time margin to eliminate downtime when actual drivage performance lags behind the planning data. The action time structure of modern CBM is presented, and recommendations are given on CBM efficiency evaluation as actual action time in cutting road face rocks. The application areas of various modern CBM types are justified. Recommendations are proposed for changing the parameters of longwall panels and to change to multi-entry longwall panels in order to increase efficiency of preparatory works and actual coal production. The authors describe expediency of widespread use of shuttle cars to improve efficiency of haulage of rocks and materials. The organizational and technological principles of the efficiency increase in preparatory works in coal mines are substantiated.

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Section: Modern Trends In Drivage Technology and Equipmentmentioning

confidence: 99%

Reproduction of the longwall panels: modern requirements for the technology and organization of the development operations at coal mines

Kazanin¹,

Sidorenko²,

Sidorenko³

et al. 2020

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“…Coatings obtained by this method are widespread and are used in various fields: aerospace, nuclear energy, automotive, and other fields. Such coatings are also widely used for the cutting part of tools used in the mining, ore, and metal processing industries [15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Improving the Wear Resistance of Piston Rings of Internal Combustion Engines when Using Ion-Plasma Coatings

Krasnyy

Maksarov

Maksimov

2020

KEM

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Modern designs of piston rings of internal combustion engines and wear-resistant coatings used for them are considered. It is noted that the upper (compression) ring undergoes the most intense wear. Among the traditionally used wear-resistant coatings of compression rings, galvanic chrome plating and thermal spraying with molybdenum are most often used. The paper proposes the use of the ion-plasma spraying method for applying hard wear-resistant coatings to the working surface of piston rings based on titanium and molybdenum nitrides. The specified method relates to vacuum coating technologies (PVD methods), in which layers of high-strength materials are sprayed directly onto the surface of the product. The present work aimed to carry out comparative tribotechnical tests of piston ring samples having hard coatings obtained by ion-plasma spraying and to compare them with traditional galvanic chromium plating. A technique has been developed for a comprehensive assessment of comparative tribological characteristics, including the critical load during testing, the specific load of seizing, the coefficients of friction, scoring resistance, and wear resistance. The test results of samples with the galvanic coating with chromium, ion-plasma spraying with titanium nitride, and molybdenum nitride are shown. In contrast, it is shown that samples with an applied ion-plasma coating surpass samples that are electrolytically chrome plated by all tribological parameters. The results obtained allow concluding that the ion-plasma coating of molybdenum nitride is promising for piston rings, as well as other critical parts of internal combustion engines.

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“…The equipment made of titanium carbide allows accelerating in several times the processing of various kinds of steel and increasing of labor productivity in the mining, ore and metalworking industries. In addition, such a tool can easily work with viscous materials that "classic" cutters cannot cope with [9][10][11][12][13]. Titanium carbide coatings are widely used in various fields: aerospace, nuclear power, automotive industry (Fig.…”

Section: Introductionmentioning

confidence: 99%

The Assessment of Wear Resistance of Thin-Layer Carbide Coatings under Vacuum Arc Depositio

Krasnyy¹,

Vazhenin²

2018

Proceedings of the International Symposium “Engineering and Earth Sciences: Applied and Fundamental Research” (ISEES 2018)

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The presented research considers the tribological properties of titanium carbide coatings TiC and their areas of application. It is noted that titanium carbide TiC is one of the most effective materials used as a wear resistant coating. TiC to the greatest extent satisfies the requirements for coatings: good adhesion to the surface of the material-the base; corrosion resistance, low tendency to seizure and cold bonding. Arc plating vacuum deposition (cathodic arc ion plating)-Arc-PVD is widely used to apply high-quality titanium-based coatings. The article considers the issues of wear resistance of carbidetitanium coatings obtained by the Arc-PVD method with respect to friction at high pressures with lubrication. The Arc-PVD method makes it possible to widely vary the structure of the emerging coatings due to the change in pressure in the working chamber and the potential applied to the sublayer. The article shows the results of comparative tests of samples on a friction machine according to the scheme of two rotating rollers. It is shown that at different loading levels (50 and 500 H) the wear resistance of coated samples significantly exceeds the wear resistance of hardened steel samples. On the basis of experimental studies, the technological modes of Arc-PVD are proposed for the formation of coatings with optimal durability.

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Peculiarities of stress field formation during cutting isotropic material by mining machine cutters

Cited by 6 publications

References 2 publications

Reproduction of the longwall panels: modern requirements for the technology and organization of the development operations at coal mines

Reproduction of the longwall panels: modern requirements for the technology and organization of the development operations at coal mines

Improving the Wear Resistance of Piston Rings of Internal Combustion Engines when Using Ion-Plasma Coatings

The Assessment of Wear Resistance of Thin-Layer Carbide Coatings under Vacuum Arc Depositio

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