Investigation of elastic-dissipative stabilization of dynamic processes 
of hydropulse systems of mining machines

SHEVCHUK, Stepan

SLIDENKO, Viktor

English

Scientific hub Dnipro University of Technology

135  Methodology. The investigations were carried out on Al-Cu alloy samples with copper content 25,0 -36,0% (mass.), the rest is aluminum. The melting of samples was carried out in a Taman furnace at temperatures of 820-1100 K with a graphite heater in alund crucibles. Cooling rate of alloys was 10 K/s. Part of the samples were made using the same method, but after heating poured into wedge shapes, at the expense of which when cooled in the wide part of the wedge the cooling rate was obtained 102 K/s, and in the thin part  104 K/s. In the work we use differential thermal, metallographic, chemical and X-ray spectroscopic analyses. Findings. The effect of overheating of the melt and cooling rate of alloys of the Al-Cu system with a copper content of 25.0-36.0% ( mass.), the rest of the aluminum is investigated. It is shown that an overheating of the liquid at 50-100 K above the liquid-liquid line leads to the formation of a fine-dispersed eutectic structure and the inhibition of the formation of primary aluminum crystals in the pre-evacuation of alloys and the Al2Cu phase in hypereuvtectic alloys, in accordance. An increase in the melt overheating temperature by 150 K above the liquid-liquid line and the subsequent cooling at 103-104 K/s leads to the complete inhibition of the formation of primary crystals. An overheating of the melt on 100-150 K alloys above the liquid line and subsequent cooling with a velocity of 103-104 K /s reduces the rate of corrosion by 30-45% and increases the numerical value in 1,3-1,45 times the relative wear resistance, and the brittleness of alloys decreases in 1,2-1,35 times in comparison with the samples after casting. Keywords: melt, overheating of the alloy above the liquidus line, Al-Cu alloy, Al2Cu phase, eutectic References 1. Murray J. L., (1985) The aluminium-copper system, Meta. International ls Reviews. 30, 211-235.  2. Plevachuk Y., Sklyarchuk V., Yakymovych A, Eckert S., Willers B., (2008) Eigenfeld Density, Viscosity, and Electrical Conductivity of Hypoeutectic Al-Cu Liquid Alloys, Metallurgical and Material stransactions. 39, 3040-3045.  3. Konstantinova N.Yu., Popel P.S., Yagodin D.A., (2009)  Kinematicheskaya vyazkost zhyidkih splavov med-alyuminiy, ТВТ, 47, №3 pp. 354- 359.   ELASTIC-DISSIPATIVE STABILIZATION OF DYNAMIC PROCESSES OF HYDROPULSE SYSTEMS OF MINING MACHINES  SHEVCHUK Stepan & SLIDENKO Viktor National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute", Ukraine  Purpose. Investigation of elastic-dissipative stabilization of dynamic processes of hydropulse systems of mining machines. 136  Methodology. The studies were carried out through analyzing effective elastic-dissipative connections of elements of structures. Parameters are calculated by methods of finite and differential differences with conducting of experimental researches. Findings. The results of investigations of the dynamic processes of the functioning of the hydropulse system and means of reducing the impact on the base machine that are given in the article. Effective elastic-dissipative connections of elements of structures that influence the stabilization of dynamic processes are offered. Their parameters are calculated by methods of finite and differential differences with conducting of experimental researches. Connections: the waveguide reduces the dynamic factor by 25 ... 30%; heterogeneous lyophobic system, which provides an increase in the decrement of the damping vibrations of 1,4 ... 1,95. Keywords: stabilization, stiffness, dissipation, hydraulic hammer, waveguide, heterogeneous lyophobic system References 1. Impact machines for the destruction of rocks / D.P. Lobanov, V.B. Horowitz, E.G. Fonberstein and others. M .: Nedra. 1983.-152 p. 2. Chuprov I.V. Interrelation of specific energy of destruction of a rock with energy of a single impact // Izvestiya Vuzov. Mining journal. - 2004 - №5. P.66-69. 3. Saginov A.S. Theoretical foundations for the creation of hydroimpulse systems of shock bodies of machines. Saginov, I.A. Yatsen, D.N. Eshutkin, G.G. Piven. Alma-Ata: Science, 1985. 256 p. 4. Investigation of the interaction of tools and rocks during impact destruction / E.V. Alexandrov, V.B. Sokolinsky, G.M. Zakharikov et al. - Moscow: IGD them. A.A. Skochinskogo, 1967. - 62 p. 5. Slidenko V.М. Mathematicians modulation of shock processes of hydropulse systems of mining machines: monograph / V.M. Slidenko, O. M. Slidenko -NTUU "KPI" , 2017. - 220 p. 6. Slidenko V.М. Stabilization of the operation of a mining machine with a pulsed executive body: monograph / V.M. Slidenko, S.P. Shevchuk -K.: NTUU "KPI", 2010. - 192 p. 7. Y. A. Vetrov. Soil cutting with digging machines / Yu.A. Winds - Moscow: Mechanical Engineering, 1971.- 360 p. 8. Baladinsky V.L. Dynamic destruction of soils / V.L. Baladinsky. - К .: Nadra, 1971.- 128 with. 9. Alimov O.D. Graphodynamic calculation of rotational-shock mechanisms / O.D. Alimov, L.T. Dvornikov, I.D. Shaposhnikov // Proceedings of the Frunze Polytechnic Institute. - No. 1971. - No. 45. - P. 53-62. 10. Sveshnikov I.A. Influence of the mutual arrangement of incisors on the energy intensity of the destruction of a solid rock / I.A. Sveshnikov, A.L. Maistrenko, S.D. Zabolotniy and others. Metalworking tools - machinery and 137  technology of its manufacture and use: V.N. Bakulev National Academy of Sciences of Ukraine, 2009. -Vyp.12. -FROM. 89-93. 11. Kichigin A.F. Mechanical destruction of rocks in a combined way / A.F. Kichigin, S.N. Ignatov, A.G. Lazutkin, I.A. Yantsen // M .: Nedra, 1972. - 254 p. 12. Eroshenko V.A. A new paradigm of mechanical energy dissipation. Part 1: theoretical aspects and practical solutions // J. Proc. of mechanical Engineers, Vol. 221. Part D: J. of Automobile Engineering. - 2007. - Vol. 221, No. 3. - P. 285-300. 13. Eroshenko V.A Power dissipation of the energy of oscillations of mining machines by heterogeneous leiophobic systems / Eroshenko V.A., V.M. Slidenko, S.P. Shevchuk, V.P. Studenets V.P.: NTUU "KPI", 2016 -180 p. 14. Ivanov A.P. Dynamics of systems with mechanical collisions / A.P. Ivanov .- Moscow: International Program of Education, 1997. - 336p. 15. Pat. 88954 of Ukraine, Е02F 3/04. A device for stabilizing the dynamic process of destruction of strong soil or rocks/ Eroshenko V.A., V.M. Slidenko, V.P. Studenets V.P. [and others.];  - Kyiv Polytechnic. Institute of Education.  No. 201311667; claimed. 10/03/2013; publ. 10.04.2014/   THEORETICAL INVESTIGATIONS OF THE STRESSED STATE ON THE EXCHANGE RATE OF MATRIX AT HIGHLY CYLINDER PARTS  ARHAT R.1, PUZYR R.1, HAIKOVA T.1 & MARKEVYCH A.2 1Kremenchuk Mykhailo Ostrohradskyi National University, Ukraine 2Lanzhou University, China  Purpose. investigations of the stressed state on the exchange rate of matrix at highly cylinder parts. Methodology. The studies were carried out through mathematical modeling of the change of stresses at extraction on a void surface of a matrix and used fo r more accurate description of their distribution in comparison with existing dependencies. Findings. The paper presents the results of theoretical studies on the distribution of components of the stress tensor on the extractor rib of the matrix during the extraction without the clamping of the cylindrical part. Such studies should more fully disclose the laws of stress distribution and deformation during plastic deformation in order to obtain formal connections between the parameters of the process and their impact on the quality of the final product. A mathematical model of the change of stresses at extraction on a void surface of a matrix is obtained, which more accurately describes their distribution in comparison with existing dependencies Keywords: extract; blank; meridian voltage; extracting edge of the matrix 

ELASTIC-DISSIPATIVE STABILIZATION OF DYNAMIC PROCESSES  OF HYDROPULSE SYSTEMS OF MINING MACHINES

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ELASTIC-DISSIPATIVE STABILIZATION OF DYNAMIC PROCESSES OF HYDROPULSE SYSTEMS OF MINING MACHINES

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