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.

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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.
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.
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.
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.
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.