Кафедра "Інтегровані технології машинобудування ім. М. Ф. Семка"

Постійне посилання колекціїhttps://repository.kpi.kharkov.ua/handle/KhPI-Press/3115

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

Від 2005 року кафедра має назву "Інтегровані технології машинобудування" ім. М. Ф. Семка, попередня назва – "Різання матеріалів та різальні інструменти".

Кафедра заснована в 1885 році. Свої витоки вона веде від кафедри механічної технології (у подальшому – кафедра загального машинобудування, кафедра холодної обробки матеріалів, кафедра різання матеріалів та різальних інструментів).

Засновником і першим завідувачем кафедри був фундатор технологічної підготовки інженерів-механіків в ХТПІ Костянтин Олексійович Зворикін.

Кафедра входить до складу Навчально-наукового інституту механічної інженерії і транспорту Національного технічного університету "Харківський політехнічний інститут і є провідним науково-дослідним і освітнім центром України в галузі високих інтегрованих технологій у машинобудуванні. У науковій школі кафедри різання матеріалів підготовлені 18 докторів технічних наук і 104 кандидата технічних наук.

У складі науково-педагогічного колективу кафедри працюють: 3 доктора технічних наук, 9 кандидатів технічних наук; 3 співробітника мають звання професора, 6 – доцента.

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Зараз показуємо 1 - 10 з 11

Analyzing the effect of the tool pass number and the direction of sliding burnishing on surface roughness
(Національний технічний університет "Харківський політехнічний інститут", 2022) Nagy, Antal; Varga, Gyula
Nowadays, the concern of environmental protection is becoming more and more important in production as well. They often contribute to this by reducing or eliminating the amount of coolants and lubricants, or by using alternative machining methods. One of them is burnishing, which makes a positive effect on surface integrity, while reduces the environmental load. In this paper we examined the change in surface roughness achieved by burnishing after turning on a corrosion-resistant steel workpiece, where the number of burnishing passes and burnishing direction were changed. The results showed increased smoothness, bearing capacity and dimensional stability by increasing the number of passes from 1 to 2, however, the 3 times repetition did not show any additional favorable improvement on the surfaces. In case of the forward-backward-forward burnishing directions, further chipping occurred, in other cases the effect of the directions was negligible on the amplitude roughness parameters, but considerable on the parameters characterizing the roughness peak. The greatest improvement was achieved with the backward-forward settings.
The effect of burnishing process on skewness and kurtosis of the scale limited surface
(Національний технічний університет "Харківський політехнічний інститут", 2022) Ferencsik, Viktoria; Varga, Gyula
In this paper roughness examination and analysis on burnished low alloyed aluminium surfaces are reported, highlighting 2 parameters from the vertical deviations of the roughness profile from the mean line. From the input parameters of the burnishing process, the effect of burnishing force, feed rate, speed and number of passes are investigated. Measurements of the surface topography – before and after burnishing – are conducted on an Altisurf 520 3D measuring device. The generated and calculated values of the machined surface roughness are analysed in detail with the drawing of the conclusions as well.
Preliminary analysis of surface topography in tangential turning
(Національний технічний університет "Харківський політехнічний інститут", 2022) Sztankovics, I.; Pásztor, I.
Among the productivity-increasing high feed turning procedures, the tangential turning is studied in this paper. Our main focus was a preliminary analysis of the machined surface topography by the DoE method. To achieve this goal 2 kinds of cutting speed, feed and depth of cut were chosen as factors which are influence the surface topography, resulting in 8 experimental setups. After the cutting experiments 2D profile measurements and shape error measurements were done. In this paper the Ra, Rz parameters of the roughness profile, Wa, Wz parameters of the waviness profile and the straightness error were analysed in more depth. We determined their alteration as a function of the studied parameters and designated our further research directions.
Методичні вказівки до виконання лабораторної роботи "Контроль шорсткості поверхні" з дисциплін "Взаємозамінність, стандартизація та технічні вимірювання", "Метрологія і стандартизація", "Метрологія, сандартизація і сертифікація", "Метрологія, стандартизація, сертифікація і акредитація", "Метрологічне забезпечення якості", "Сертифікація і метрологічне забезпечення якості", "Метрологія і основи вимірювань"
(2022) Козакова, Наталія Віталіївна
Точність вигтовлення виробів визначається комплексом показників, одним з яких, є шорсткість поверхонь. Шорсткість – це сукупність нерівностей поверхні з відносно малими кроками, які утворюються при її обробці. Метою роботи є практичне ознайомлення з методами контролю шорсткості поверхні та параметрами шорсткості.
Analysis of the change in roughness on a face-milled surface measured every 45° direction to the feed
(Національний технічний університет "Харківський політехнічний інститут", 2021) Nagy, Antal; Kundrak, Janos
In this article, we analyze the difference (inhomogeneity) of the roughness values measured on a nonalloy carbon steel surface milled with a parallelogram-shaped (κr = 90°) insert as a function of the the tool movement direction and the relative position of the examining points on the workpiece surface. The characteristic distribution of roughness and the magnitude of the deviations were examined by measuring at selected points along several planes on a surface characterized by the movement conditions of the workpiece and the symmetrically arranged tool perpendicular to the machined surface, which formed double milling marks. The selected points mark the lines with specified inclinations with respect to the feed direction, and their measured values were compared. In these directions, the magnitude of the difference in roughness measures was obtained.
Influence of the geometric characteristics of the discontinuous profile working surfaces of abrasive wheels for precision and temperature when grinding
(Національний технічний університет "Харківський політехнічний інститут", 2021) Yakimov, A.; Bovnegra, L.; Tonkonogyi, V.; Vaysman, V. O.; Strelbitskyi, V.; Sinko, I.
Grinding is the most common finishing method for hardened steel parts. Grinding is accompanied by a large heat release in the cutting area, under the influence of which structural changes appear in the thin surface of the processed parts, tensile stress and even microcracks, which significantly reduce the operational reliability of machines that include these parts. The use of abrasive wheels with an intermittent working surface makes it possible to reduce the temperature in the area of contact of abrasive grains with the material of the workpiece and, as a consequence, stabilize the quality of the surface layer of the workpieces. High-frequency vibrations in the elastic system of the machine, accompanying the work of an intermittent wheel, are a positive factor that reduces the energy consumption of the grinding process. However, under certain conditions of dynamic interaction of the tool with the workpiece, parametric resonance may occur, which worsens the geometric and physical-mechanical parameters of the quality of the surface layer of the processed part. The aim of the work is to realize the possibility of predicting the quality parameters of the surface layer of parts during intermittent grinding by studying the influence of the design features of the macrotopography of the working surface of abrasive wheels and processing modes on the nature of the dynamic interaction of the tool with the workpiece and the heat stress in the cutting area. It was found that the parametric vibrations of the elastic system of the machine tool can be shifted to a more stable area, due to an increase in the number of interruptions of the working surface of the abrasive whee l with a constant ratio of the length of the protrusions and depressions. The increase in the number of breaks on the wheel also contributes to a decrease in temperature in the cutting area. It was found that to maintain the stable operation of the elastic system of the machine, it is necessary to reduce the number of cavities on the grinding wheel with an increase in the cutting speed. However, both of these actions are accompanied by an increase in the heat stress of the grinding process. It has been experimentally established that for ordinary (pendulum) grinding, it is possible to achieve an increase in processing productivity by increasing the speed of the longitudinal movement of the table.
Finish machining of the cutting inserts from cubic borine nitride BL group composite
(Національний технічний університет "Харківський політехнічний інститут", 2021) Chumak, A.; Klimenko, S.; Klimenko, S.; Manokhin, A.; Naydenko, A.; Kopeikina, M.; Burikin, V.; Bondarenko, M.; Burlakov, V.
Finishing methods of machining of superhard composite’s working elements based on cubic boron nitride BL group are considered. The results of the microgeometry formation research of the cutting inserts’ surfaces during machining by free powders of synthetic diamond, grinding wheels and a method of vibro-magnetic-abrasive machining (VMAM) are presented. It is shown that during VMAM the friction between the inserts’ surfaces and the abrasive particles result in microremoval of the material, which reduces the roughness of the cutting inserts’ surfaces. It is established that additional fine grinding with 14/10 mkm synthetic diamond powder provides the absence of microgeometry defects of the cutting inserts’ surfaces left by pre-machining. The result of high-quality rounding of cutting edges and the formation of surfaces of cutting inserts with less roughness is an increase in strength and wear resistance of metal-cutting tools in high-speed machining under conditions of significant loads.
Experimental investigation of surface topography of AL7075-T6 alloy machined by EDM
(Національний технічний університет "Харківський політехнічний інститут", 2021) Balanou, M.; Papazoglou, E. L. ; Markopoulos, Angelos P.; Karmiris-Obratański, P.
Electrical discharge machining is one of the most important non-conventional machining processes for removing material from electrically conductive materials by the use of controlled electric discharges. EDM is a non-contact machining process, therefore, is free from mechanical stresses. This paper investigates the machining Al7075-T6 alloy by EDM using a copper electrode. Al7075-T6 alloy was selected, because of its growing use in a lot of engineering applications. The effect of electrical parameters, peak current and pulse-on time, on the surface integrity, was studied. Area surface roughness parameters (arithmetical mean height, Sa, and maximum height, Sz) were measured on all samples and 3D surface characterization has been carried out with confocal laser scanning microscopy. The experimental results showed that the surface roughness is mainly affected by the pulse-on time.
On the machining of aluminum alloy AL6063 with EDM
(Національний технічний університет "Харківський політехнічний інститут", 2020) Papazoglou, E. L.; Karkalos, Nikolaos E.; Markopoulos, Angelos P.; Karmiris-Obratański, P.
Electrical Discharge Machining (EDM) is a non-conventional machining process, which allows the machining of any electrical conductive material, regardless its mechanical properties, with high dimensional accuracy, and in complex shapes and geometries. EDM widely utilized by modern industry, taking advantage of its unique inherent capabilities. Aluminum alloys find extensive use in numerous applications, and their machining consist an interesting topic, with tangible industrial interest. The current study presents an experimental investigation of machining Al6063 alloy with EDM. A full scale experiment was conducted, with control parameters the pulse-on current and time. The productivity of the process calculated based on the Material Removal Rate (MRR), while the Surface Roughness of the machined surfaces was estimated in terms of Ra and Rt. For these performance indexes Analysis Of Variance was performed and semi-empirical relations that correlate machining parameters with obtained results were proposed. Finally, the cross sections of the specimens were observed inoptical microscopy, in order the formation of the White Layer to be studied.
Fe investigation of surface burnishing technology abstract
(Національний технічний університет "Харківський політехнічний інститут", 2020) Ferencsik, Viktoria; Gal, V.
This paper investigates the finite element analysis of cold forming diamond burnishing process on aluminium alloy, where the input parameters are force, feed rate and speed, as an output parameter the changing of surface roughness is analysed. This lifetime increasing process effectively reduces roughness, improves shape correctness, and increases the hardness of the sub-surface area. Machining simulation of the turned surface before burnishing is based on the real model, corresponding to the measured values, by using DEFORM-2D software in order to validate the improvement of surface quality with numerical values too.