Кафедра "Ливарне виробництво"

Постійне посилання колекціїhttps://repository.kpi.kharkov.ua/handle/KhPI-Press/3124

Офіційний сайт кафедри http://web.kpi.kharkov.ua/lv

Кафедра "Ливарне виробництво" створена у 1927-1928 роках на базі ливарної лабораторії, що існувала в технологічному інституті ще з 1924 року.

Першим завідувачем кафедри став професор Євген Євгенович Фарафонов. Перший випуск спеціалістів-ливарників у кількості 5 осіб, переведених з інших спеціальностей, відбувся у 1928 році.

Кафедра входить до складу Навчально-наукового інституту механічної інженерії і транспорту Національного технічного університету "Харківський політехнічний інститут".

У складі науково-педагогічного колективу кафедри працюють: 4 доктора технічних наук, 1 кандидат технічних наук, 1 доктор філософії; 4 співробітника мають звання професора.

Переглянути

Зараз показуємо 1 - 20 з 315

Basic principles of creating digital production in the mechanical engineering industry
(Державний біотехнологічний університет, 2024-04-22) Yevtushenko, S .D.; Zapolovskyi, M. Y.; Ponomarenko, O. I.
A systematization of the composition of methods and means for building digital production is proposed. Attention is paid to the development of technology for information support of products of production systems.
The choice of the optimal temperature and time parameters of gas nitriding of steel
(ЧП "Технологический Центр", 2016) Al-Rekaby, Dhafer Wadee; Kostyk, Viktoriia; Kostyk, Kateryna; Glotka, Alexandr; Chechel, Mykola
Mathematical modeling of the gas nitriding process allows solving the problems of control of process parameters, prediction of outcomes and development of various treatment conditions, which is quite an urgent issue today. The research was aimed at selecting the optimum temperature and time parameters of gas nitriding of 38Сr2MoAl steel. Optical and electron microscopy showed that the diffusion layer after gas nitriding in the ammonia environment is the nitrided case and the region of internal nitriding. The experimental data showed that the diffusion layer depth varies from 40 to 650 µm in the range of gas nitriding temperatures of 500-560 °С and time of 20-80 hours, while the surface hardness varies within 6.5-10 GPa. The mathematical models in the form of quadratic polynomials, describing the dependence of the depth of the nitrided case and the surface hardness on the temperature and time of gas nitriding were obtained. The mathematical description of the changes in the depth of the nitrided case and surface hardness depending on the changes in the treatment temperature and time, which allows determining the specific conditions of the gas nitriding (temperature and time) based on the desired depth of the diffusion layer or the surface hardness of 38Сr2MoAl steel was constructed.
Computer-integrated design of cast parts on the criterion of performance on the example of the turbine wheel turbocharger
(2019) Akimov, O. V.; Soloshenko, V.; Kostyk, K. O.
In this work the method of computer modeling solved the problem of reducing the efficiency of the turbocharger associated with the mismatch of the geometry of the resulting casting petal turbine technology geometry, calculated gas-dynamic calculations. Computer methods was calculated crystallization of the casting and hardening of the stencil. Computer simulation showed that there is a significant change in the geometry of the turbine blade, which adversely affected the geometry of the resulting casting. Was proposed and solved by the method of computer simulation of "reverse" task of the task of such a geometry of the mold, the solidification of the stencil in water and its deformation led to a (given) geometry of the resulting casting of the turbine of the turbocharger. The solution of this problem by the method of computer modeling allowed to reduce the production defect on the discrepancy of the turbine blade geometry of the turbocharger by 90 %.
Defects of castings. Part 1
(2021) Kostyk, K. O.
Methodical instructions are intended for students of the specialty 131 Applied Mechanics of the Bachelor's level. Laboratory works are small study researches that allow students to get acquainted in more detail with the main defects of castings of the first and second groups and methods of their definition, to study features of formation of defects from geometry and surface defects. Each laboratory work contains a list of materials, a summary of theoretical information and research methods, the order of execution, which helps students to correctly and consciously perform the practical part of the work and draw conclusions. The purpose of the methodological instructions is to help students to study more deeply the topic "Inconsistency in geometry, surface defects of castings" in the discipline "Foundry alloys and smelting technologies", to develop skills of independent work and scientific research. In addition to the main goal, the methodological instructions are aimed at developing interest in scientific activity, familiarity with complex and varied experimental techniques, and will help students in the future in completing their thesis.
Developing progressive rods production technologies to produce high-quality casting
(АА Тандем, 2019) Berlizeva, T.; Ponomarenko, O. I.; Shvets, M.
Development of a combined technology for hardening the surface layer of steel 38Cr2MoAl
(Технологический центр, 2017) Idan, Alaa Fadhil І; Akimov, Oleg; Kostyk, Kateryna
Development of new combined strengthening technologies for treatment of steel surface layer is a topical issue. Influence of conditions of combined hardening treatment on variation of properties of the surface layer of 38Cr2MoAl steel was studied. Experimental data have shown that thickness of the hardened layer of 38Cr2MoAl steel, depending on the process conditions of combined treatment, varied in the range 0.18 to 0.69 mm with the surface hardness being 10.5-12.5 GPa. Mathematical models of the hardened layer thickness and surface hardness were obtained depending on variation of velocity of the laser beam travel and duration of nitriding of steel following the combined treatment. In their structure, the models are regression equations. These regularities have practical technological significance and ensure prediction of values of the hardened layer thickness and surface hardness. Nomograms of simultaneous influence of velocity of the laser beam travel and duration of nitriding on thickness of the hardened steel layer and surface hardness were constructed. Nomograms make it possible to determine concrete conditions of hardening processing, starting from specified thickness of the hardened layer or the surface hardness of 38Cr2MoAl steel, respectively and also to solve inverse problems. This method is suitable for hardening hard-to-reach part sectios and local contact areas.
Development of an iron-based alloy with a high degree of shape recovery
(Технологический центр, 2017) Ahmed, Sundus Mohammed; Akimov, Oleg; Kostyk, Kateryna
We examined a technological process for receiving an ironbased alloy with a shape memory effect, substantiated the choice of chemical composition of the alloy, and selected thermal treatment modes. Research results into scale resistance revealed at heating the samples in the temperature range of 600-1000 °C, surface oxidation was not observed. In the course of experiment on corrosion resistance of the alloy, we found that the alloy is corrosion resistant and is not inclined to change the weight when exposed to 10 % solution of sulfuric acid. Study into the microstructure confirmed the existence of dispersion hardening in the alloy after the aging regimes. Diffractogram of the alloy after hardening at a temperature of 1150 °C and cooling in the open air showed a surge that corresponds to γ-Fe, therefore, the content of residual austenite in the alloy is 100 %. Research results demonstrated that the degree of shape recovery of the proposed alloy is 78-97 %. The proposed alloy is plastic enough; it may undergo hot, warm and cold deformation in the open air. We constructed mathematical models of the impact of chemical composition of the alloy on tensile strength of the alloy and the values of a shape memory effect. The iron-based alloy with a shape memory effect can be obtained both under laboratory conditions and on industrial equipment.
Development of innovative method of steel surface hardening by a combined chemical-thermal treatment
(Scientific Route, Estonia, 2016) Kostyk, Kateryna
The aim of the article is a hardening of the surface steel layers due to the combination treatment. Samples of steel 38Cr2MoAl were hardened by complex chemical and thermal treatment such as carburizing and subsequent boriding. It was established that surface double-layer hardening for steel 38Cr2MoAl with sequential saturation with atomic carbon (during carburizing) and atomic boron (during furnace boriding) at different temperatures allowed to form a boride layer with transition zone. The obtaining transition zone can improve operational properties of machine parts and tools by micro-friability reduction of diffusion layer. An optimal mode of complex chemical-thermal treatment (CTT) was obtained for the regime, which includes carburizing at 950 °C for 2 hours, boriding at 950 °C for 2 hours, which allows to get the best value for the surface hardness of 22 GPa with a maximum overall diffusion layer 1.4 mm. Due to the technology of combined treatment we can significantly reduce treatment time compared to traditional hardening means and significantly improve product performance properties due to the transition zone between the borides and the matrix of machine elements. The technology can be used in enterprises where there is any hardening furnace without additional installation or conversion of equipment.
Different Ways of Input of Additions in CHM with Liquid Glass
(АА Тандем, 2018) Yurchenko, V.; Berlizeva, T.; Ponomarenko, O.
Increase of operational properties of tools and machine parts nitriding the powder mixture
(2019) Kostyk, V. O.; Kostyk, K. O.; Kovalov, V. D.; Turmanidze, R.; Dašić, P.
The effect of diffusion layers and alloying elements on surface hardness, microcoarseness, and wear resistance of hardened tool steels in a nitrogen-containing medium is Studied. The experiments showed that nitriding in the powder mixture strengthens the surface layers in 2–3.5 times without reducing the volume strength of the material in question, which contributes to the preservation of high structural strength of tools and machine parts. It was found that nitriding in the dispersed powder mixture provides increased wear resistance of 1.3–2.5 times of steel, which can significantly improve the reliability and durability of products. Mathematical models of wear resistance of the investigated steels after the proposed hardening technology of nitriding are obtained.
The influence of the driving speed and vertical acceleration of the mobile machine on the change of soil packing
(Ukrainian State University of Railway Transport, 2018) Artiomov, M. P.; Klets, D. M.; Boldovskyi, V. M.; Makovetskyi, A. V.; Kostyk, K. O.
The article deals with the processes of changing the vertical forces acting on the propulsion of mobile machines, causing soil compaction when changing the driving speed and vertical accelerations of a mobile machine moving on a deformable soil. The influence of parameters and characteristics of the running gear system of the wheeled tractor, as well as the traction load on the value of vertical accelerations when moving along the soil, is determined. The dependence of the influence of vertical accelerations on the dynamic loads on the axle of the tractor front and rear axles is determined. The dependence of the soil density variation caused by the action of dynamic loads from the propulsion of the tractor front and rear axles has been determined.
Mathematical model of server requests intensity description
(Національний технічний університет "Харківський політехнічний інститут", 2020) Pustovoitov, Pavlo; Kostyk, Kateryna; Kompaniiets, Volodimir; Voronets, Vitalii; Haidar, Hasan
The paper is devoted to the mathematical model development of non-stationary flow of requests from clients to the database in order to modulate the quality of service. The mathematical model of the queries number fluctuations to the database has the form of a regression equation and allows more accurate modeling of the connections pool size in the servlet. Connection pool is a pattern that helps to reduce responding time for queries to databases. To another hand the extra used memory wasting server resources. The task of calculating the optimal connection pool size could be solved by verity of mathematical apparatuses that demand information about intensity of stationary incoming queries flow. It is known, that real incoming queries flow is non-stationary. In the paper was suggested mathematical model of flow intensity fluctuations with daily and hourly harmonic vibrations. Statistics analyses of model adequacy was made, homogeneity of variances is checked, the significance of the coefficients of the regression equation was estimated. The obtained mathematical model describes fluctuations in the intensity of clients' requests to the servlet during the week. The mathematical model can be used to predict the load on the server or to build a simulation model of the query service system. The adequacy of the model is checked, the homogeneity of variances is checked, the significance of the coefficients of the regression equation is estimated, the adequacy of the regression equation is checked, the analysis of the autocorrelation of the residues is carried out. The results obtained in the article give further development for modeling process technologies in the field of information systems and can be used to calculate the load on the server with a non-stationary flow of requests from clients to the database.
Mathematical modeling of properties of forming mixture using bischofite
(Донбаська державна машинобудівна академія, 2019) Ponomarenko, O. I.; Berlizeva, T.
Modeling of the case depth and surface hardness of steel during ion nitriding
(ЧП "Технологический Центр", 2016) Khalaf, Mohanad Muzahem; Kostyk, V.; Demin, D.; Kostyk, Kateryna
Modeling of the ion nitriding process allows solving many problems of operations management, forecasting of results and development of new treatment regimes, which is an urgent issue today. The goal of the paper was modeling of the case depth and surface hardness of 38Cr2MoAl А steel during ion nitriding. The experimental data showed that the case depth varies from 20 to 620 µm in the ion nitriding temperature range of 500-560 °С and duration of 1-12 hours, with the surface hardness varying from 8 to 12 GPa. The mathematical models in the form of quadratic polynomials, describing the dependence of the nitrided case depth and surface hardness on the temperature and duration of thermochemical treatment were obtained. The graph-analytical description of variations in the nitrided case depth and surface hardness depending on variations in temperature and duration of treatment, which allows determining the specific conditions of ion nitriding 38Cr2MoAl steel is constructed.
Nanodispersed boriding of titanium alloy
(Одеський національний політехнічний університет, 2015) Kostyk, K. O.; Kostyk, V. O.
The problem of improving the operational reliability of machines is becoming increasingly important due to the increased mechanical, thermal and other loads on the details. There are many surface hardening methods for machines parts which breakdown begins with surface corruption. The most promising methods are chemical-thermal treatment. Aim: The aim of this work is to study the impact of boriding on the structure and properties of titanium alloy. Materials and Methods: The material of this study is VT3-1 titanium alloy. The boriding were conducted using nanodispersed powder blend based on boric substances. Results: It is established that boriding of paste compounds allows obtaining the surface hardness within 30...29 GPa and with declining to 27...26 GPa in layer to the transition zone (with total thickness up to 110 μm) owing to changes of the layer phase composition where Ti2B, TiB, TiB2 titanium borides are formed. The increasing of chemical-thermal treatment time from 15 minutes to 2 hours leads to thickening of the borated layer (30...110 μm) and transition zone (30...190 μm). Conclusions: Due to usage of nanodispersed boric powder, the boriding duration is decreasing in 2...3 times. This allows saving time and electric energy. The developed optimal mode of boriding the VT3-1 titanium alloy allows obtaining the required operational characteristics and to combine the saturation of the surface layer with atomic boron and hardening.
Process of Obtaining High-Quality Sand-Plaster Moulds for Thin-Walled Aluminum Castings
(АА Тандем, 2020) Berlizeva, T.; Ponomarenko, O.; Grimzin, I.; Marynenko, D.
The aim of the research is to develop a technology for the preparation and drying of moulds and cores based on sand-plaster mixtures, which allows to obtain exact details of a complex form of required quality.
Research of influence of gas nitriding duration on formation of diffusion layer of steel 20Kh2N4A
(Одеський національний політехнічний університет, 2015) Kostyk, K. O.
The research of the gas nitriding process, which allows to obtain a high surface quality of steel parts and has a wide application in mass production, is relevant. Aim of the research is to study the influence of gas nitriding modes on the structure and properties of alloy steel. The research material in this work is steel 20Kh2N4A. Nitriding of the samples is carried out in a shaft furnace at the temperature of 510…530 °C during 35, 40, 46 and 48 h. It is found that the alloy steel 20Kh2N4A preliminary heat treatment before nitriding provides the hardness of products core to 279...321 HV due to the formation of perlitesorta structure with carbides of alloying elements. The results show that increasing the duration of nitriding from 35 to 48 hours at 510…530 °С increases the depth of nitrided layer from 0,35 to 0,55 mm with surface hardness up to 648 MPa at the maximum depth of the layer. The results of this research can be used in industry and research works.
Research of the effect of different hardware on properties of cold-hardening mixtures
(Національний технічний університет "Харківський політехнічний інститут", 2019) Berlizeva, T.; Ponomarenko, O. I.
Surface hardening of steel parts
(Одеський національний політехнічний університет, 2017) Idan, Alaa Fadhil І; Akimov, O. V.; Kostyk, K. O.
Development of new resource-saving and costeffective technologies of combined hardening of steel parts with a significant reduction of the process duration is an important and urgent task. Aim: The aim of the work is to create a technology for combined toughening of steel parts to provide high operational properties of the steel surface layer by intensifying the nitriding process through the laser pre-treatment of steel products. Materials and Methods: Materials for study are types of steels 40, 40Cr and 38Cr2MoAl. Laser treatment of steel was performed at the LATUS-31 installation. Nitriding carried out in the environment of fine nitrogen-containing substance with activators at a temperature of 530…560 ºC during 2…3 hours. The nitriding process was carried out in the closed atmosphere in the chamber furnace without application of the protective atmospheres. Influence of laser pre-treatment and final nitriding on structure, thickness, phase structure, microhardness of surface layers of steel samples has been investigated. Results: It is shown that preliminary hardening by laser increases surface hardness in 0.88…1.15 times after nitriding, depending on brand of steel and speed of a laser beam movement, in comparison with steel nitriding in similar conditions. The combined treatment promotes significant increase in the strengthened layer – up to 0.49 mm for 40 steel type, up to 0.55 mm for 40Cr steel type and up to 0.65 mm for 38Cr2MoAl steel type.
A systematic approach to determining the level of safety risk of foundry equipment
(Донбаська державна машинобудівна академія, 2023) Yevtushenko, N. S.; Tverdokhliebova, Natalia; Ponomarenko, O. I.
Foundries are the most dangerous production facilities of machinebuilding enterprises. That is why risk assessment, aimed at identifyingpreventing and reducing the negative impact of risks in the manufacture offoundry elements, is so important. The most typical accidents for hazardousproduction facilities in foundries are accidents associated with the productionuse of liquid metal (smelting, transportation and casting of the meltexplosions caused by contact of the melt with water; explosions of closed containers filled with liquid that fell into the melt along with the charge, as well fires caused by the ignition of flammable materials upon contact.