Wyniki 1-2 spośród 2 dla zapytania: authorDesc:"Valentyna ZAGIRNYAK"

The Estimation of Suspended Iron Separators with Arch Poles with the Use of Magnetic Modulus Method DOI:10.15199/48.2018.11.38

Czytaj za darmo! »

The experience of the operation of suspended electromagnetic iron separators used for the protection of the production equipment against accidental drop of ferromagnetic objects during the transportation of bulk materials by belt conveyors reveals that the common drawback of such devices consists in the insufficiency of the extracting effort created by them at the edges of the working zone [1]. As a result, a part of unwanted ferromagnetics passes through these areas not being separated from the transported non-magnetic material and gets into the operating devices of the production equipment, which results in its breakage. Based on the analysis of the distribution of the field in the working zone of suspended iron separators, to provide the required magnetic intensity and the degree of the field heterogeneity in a relatively big volume of the extraction working zone, a new design of a suspended electromagnetic iron separator was worked out [2]. It is equipped with arch wedged-shaped pole pieces forming a gap situated at an angle to the conveyor longitudinal axis. The use of the iron separator is shown in the production chain is shown in Fig. 1. The purpose of the paper To demonstrate the expediency of the use of archshaped pole pieces in suspended iron separators based on the theoretical and experimental research, to obtain expressions for the calculation of the rational geometry of such pole pieces and to provide specific recommendations as to the relevant modernization of the devices produced in series. The calculation of the poles parameters The magnetic field of the analyzed U-shaped electromagnetic system of the suspended iron separator with arch poles is essentially 3D and it is impossible to use calculation methods from [3-6] as in our case we cannot single out such a direction along which the magnetic field of the system could be assumed quasi-plane-parallel. It caused the necessity for the choice of the method [...]

Application of explosion treatment methods for production Items of powder materials DOI:10.15199/48.2019.05.10

Czytaj za darmo! »

To successfully solve a set of interrelated tasks to maintain competitiveness in the world market, increase labor productivity, use capital efficiency and maintain high rates of economic development, the major role belongs to the methods of the powder metallurgy. These methods, due to a number of advantages, in comparison with the other methods of metal working find wide application in the production of blanks and parts of gas turbine engines, cutting and stamping tools, energy conversion and generation systems, surgical implants, etc. At the present time, the compaction of powder materials is most efficiently performed using the high-energy methods of deformation and shaping, such as: the hot isostatic pressing, intensive plastic deformation, dynamic pressing, isothermal stamping into a closed volume, explosive pressing, etc. [1]. The main disadvantage of the blanks obtained by all known methods of the powder metallurgy is the residual porosity, which reduces the mechanical and physical properties and performance characteristics of the resulting parts. To further maintain the high growth rates of key sectors of production and economy it is necessary to find methods to improve the mechanical properties of blanks and parts of the powder metallurgy. The pulse methods of the metal working in a series of cases allow either significantly improve the quality indices of parts wedging in the existing methods or entirely substitute them. For instance, in case an additional pulse effect of insignificant intensimty is made on the workable blank during the hot isostatic pressing after the primary sintering, then the parts will have the structure with the unsurpassed density [2]. The mechanism of obtaining the dense structures is theoretically and experimentally grounded by the authors [2, 3]. Research methods In the explosive pressing the density of the products obtained practically reaches the density of a solid. However, at the ex[...]

 Strona 1