Ivanov A. A., Petrov V. V
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The paper template UDC 621.983 empty line Ivanov A.A., Petrov V.V. empty line THE DEFORMATION MECHANISMS OF COPPER FIBERS DURING PRESSING empty line The deformation mechanisms of fibers of different size during production of high-density briquettes have been investigated. It has established that they are dependent from fibers’ size at the initial stage of process. The deformation mechanisms at high pressure are upsetting, drawing, bending and more complicated deformation schemes. Keywords: porous body, pressing parameters, counter-pressure, density, mechanical properties. empty line Pressing of metallic fibres is very alike to densification of powders. However there are distinctions due to sizes of pressed materials [1]. It is well-known [2-4], that on the first stage moving, sliding and rotation of elements are possible, then, bending of fibres and upsetting of contact surfaces are taking place. Sliding and rotation of fibres is highly constrained. The purpose of this work is experimental study of deformation mechanism of fibres of large diameters at production of high-density briquettes. empty line  (1)empty line where  - is coefficient of dependence for parameter i of process; - is j argument of unknown function.empty line Table 1 The deforming parameters
  a b Fig. 1. The wave propagation scheme - a and dependence of frequency from height - b: 1 – is the direct wave; 2 - is the reflected wave empty line The possibility of using of copper fibres obtained from wastes of current copper conductors has been investigated. The production technology of making copper rod from fibres, which consists of following operations - preparation of fibrous charge, cold pressing and direct extrusion has developed [4]. The difference of proposed technology of direct extrusion consists in using of initial pressing with compensator for removal of defects at extrusion. The technology for making of copper tubes allows producing the welding tips. Conclusions. The deformation mechanisms of fibres in pressings consisting of fibres of different diameters and lengths have been established experimentally. It has shown that deforming process is carrying out due to upsetting, drawing, bending and more difficult schemes during flowing of metal into the interfibrillar space. The sizes of fibres are making an influence on the deformation mechanisms at initial stage. empty line REFERENCES 1. Djachkova L.N. Intensification of diffusion processes at sintering of the alloyed ferrous materials / L.N. Djachkova, L.F. Kerghentseva, L.I. Frajman [and others] // Powder Metallurgy. – 1991. – №2. – P. 44-49. 2. Onaka S. Unified Analysis for Various Diffusion-controlled Deformation and Fracture Processes / S. Onaka, M. Kato // ISIJ International. – 1991. – Vol. 31. – №4. – P. 331-341. 3. Geguzin Ya.E. Physics of sintering / Ya.E. Geguzin. – M.: Nauka, 1967. – 360 p. 4. Vershinin V.A. Estimation of diffusion parameters during sintering of mechanical mixtures of iron and nickel powders / V.A. Vershinin, V.I. Kostikov, T.G. Egorova // Powder Metallurgy. – 1991.– №9.– P. 16-21. empty line Іванов А.А., Петров В.В. Механізми деформування мідних волокон при пресуванні. Досліджені механізми деформування волокон різних розмірів при одержанні брикетів високої щільності. Показано, що вони залежать від розмірів волокон на початковій стадії процесу. При високому тиску пресування механізмами деформування є осаджування, протягування, згин та більш складні схеми деформування. Ключові слова: пористе тіло, параметри пресування, протитиск, щільність, механічні властивості. empty line Иванов A.A., Петров В.В. Механизмы деформирования медных волокон при прессовании. Изучены механизмы деформирования волокон различных размеров при получении брикетов высокой плотности. Показано, что они зависят от размеров волокон на начальной стадии процесса. При высоком давлении прессования механизмами является осадка, протяжка, изгиб и более сложные схемы деформирования. Ключевые слова: пористое тело, параметры прессования, противодавление, плотность, механические свойства. empty line Ivanov A.A. – Dr. tech. sci, Full professor of the Volodymyr Dahl East Ukrainian National University, Lugansk e-mail: ivanov@gmail.com Petrov V.V. – PhD, Assistant professor of Donbass State Machine-building academy, Kramatorsk e-mail: petrov@gmail.com empty line The date of submission: Reviewer: surname, initials, Dr. tech. sci, Full professor. |
