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Ensuring economic efficiency of flexible fixtures in multiproduct manufacturing

Ivanov Vitalii., Liaposhchenko Oleksandr, Denysenko Yuliia, Pavlenko Ivan

Engineering Management in Production and Services

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2021

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Vol. 13, no. 1

53--62

EN

The first-priority directions for modern engineering, especially for multiproduct manufacturing, include the intensification of manufacturing processes, increasing the efficiency of technological equipment, and reducing the time required to implement technological solutions. Fixture design is a complicated and time-consuming process that requires considering many parameters of the closed-loop technological system “machine tool — fixture — cutting tool — workpiece”. One machined part can have several fixture layouts corresponding to all specified parameters; however, their effectiveness differs depending on production conditions. Search for an optimal fixture for specified production conditions is an essential stage of production planning. It has been proved that the efficiency of a manufacturing process should be assessed using single economic indicator — the cost of machining, which considers the costs of time, the total costs for process realisation, and a batch of parts. The paper aims to substantiate the efficiency of manufacturing processes in machining complex parts using flexible fixtures by developing a mathematical model that considers the cost of time, the cost of implementing the manufacturing process, and the batch value of parts production. This approach estimates the efficiency of manufacturing processes for machining complex parts and choosing the flexible fixture layout that corresponds to specific production conditions. It was proved that flexible fixtures could be effectively used for machining small batches of parts with frequent readjustments to new workpieces and short-term machining. A tendency has been established that the higher number of nomenclature of parts contributes to expanding the scope of the effective use of flexible fixtures.

2

Cylindrical flow regulators with core hole - chamber diameter effect

Ochowiak Marek, Włodarczyk Sylwia, Pavlenko Ivan, Krupińska Andżelika, Markowska Małgorzata, Dudek Leszek, Piecka Cezary

Instal

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2020

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nr 10

48--51

EN

The standard and modified liquid flow regulators were tested in this work. In modified regulators a cylindrical core hole was installed in the regulator axis. It takes the shape of a cylinder, without a base being tangent to the wall of the regulator. It is placed on the wall opposite to the outlet. The „core-hole" effect in the outflow or water from the tank contributes to the stabilization of the outflow, however, for the tested devices, a slight increase in the discharge coefficient was observed, which is undesirable in this case. It should be noted that this increase is small and should not be assessed unequivocally negatively, because stabilization of the core and even outflow of liquid are also important. It has been shown that the value of the discharge coefficient decreases with increasing diameter of the swirl chamber. The research with the participation of cylindrical vortex regulators containing a core hole, which is the subject of this article, is to be an extension of the existing knowledge on this phenomenon.

PL

W pracy przebadano standardowe i zmodyfikowane regulatory przepływu cieczy. W regulatorach zmodyfikowanych w osi rozpylacza zainstalowano cylindryczny otwór ślepy (ang. core-hole). Przyjmuje on kształt walca, pozbawionego podstawy, będącej styczną ze ścianą regulatora. Umieszcza się go na ściance przeciwległej do otworu wylotowego. Efekt „core-hole" w odpływie wody ze zbiornika przyczynia się do ustabilizowania wypływu, jednak dla przebadanych urządzeń zaobserwowano nieznaczny wzrost współczynnika wypływu, co jest w tym przypadku niepożądane. Należy zaznaczyć, że wzrost ten jest niewielki i nie należy go oceniać jednoznacznie negatywnie, gdyż ustabilizowanie rdzenia i równomierny wypływ cieczy są również istotne. Wykazano, że wartość współczynnika wypływu maleje ze wzrostem średnicy komory wirowej. Badania z udziałem wirowych regulatorów cylindrycznych zawierających otwór ślepy, które są tematem tej pracy, mogą być rozszerzeniem dotychczasowej wiedzy dotyczącej tego zjawiska.

3

Technology for complex parts machining in multiproduct manufacturing

Ivanov Vitalii, Dehtiarov Ivan, Pavlenko Ivan, Kosov Illia, Kosov Mykyta

Management and Production Engineering Review

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2019

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Vol. 10, No. 2

25–-36

EN

At present, the speed of production and its complexity increases with each passing year due to the shorter product life cycle and competition in the global market. This trend is also observed in the machine-building industry, therefore, in order to ensure the competitiveness of enterprises and reduce the cost of production, it is necessary to intensify production. This is especially true in the machining of complex parts that require a great number of setups, and technological equipment. The problem-oriented analysis of complex parts was carried out, the parts classification was structured and developed according to the design and technological features. This made it possible to offer advanced manufacturing processes for complex parts like levers, forks, and connecting rods. The flexible fixtures for specified complex parts were developed. The effectiveness of the proposed manufacturing processes, as compared with the typical ones, provides significant improvement in the production.

4

Parameter identification of the basset force acting on particles in fluid flow induced by the oscillating wall

Pavlenko Ivan, Liaposhchenko Oleksandr, Pitel Jan, Sklabinskyi Vsevolod

Journal of Applied Mathematics and Computational Mechanics

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2019

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Vol. 18, nr 2

53--63

EN

The article is aimed at the development of the analytical approach for evaluating the parameters of the Basset force acting on a particle in two-dimensional fluid flow induced by the oscillating wall. By applying regression analysis, analytical expressions to determine complementary functions were established for evaluating the Basset force. The obtained dependencies were generalized using the infinite power series. As a result of studying the hydrodynamics of a two-phase flow, analytical dependencies to determine the Basset force were proposed for assessing its impact on particles of the dispersed phase in a plane channel with the oscillating wall. It was discovered that the Basset force affects larger particles. However, in the case of relatively large wavelengths, its averaged value for the vibration period is neglected. Additionally, the value of the Basset force was determined analytically for the case of relatively small wavelengths. Moreover, it was discovered that its impact can be increased by reducing the wavelength of the oscillating wall.