Кафедра "Технологія машинобудування та металорізальні верстати"

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https://repository.kpi.kharkov.ua/handle/KhPI-Press/3960

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

Кафедра "Технологія машинобудування та металорізальні верстати" заснована в 1934 році. Першим завідувачем кафедри був доцент Ф. К. Корольов – фахівець в області металорізальних верстатів, який беззмінно керував колективом до 1966 року і суттєво вплинув на розвиток кафедри.

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

У складі науково-педагогічного колективу кафедри працюють: 5 докторів технічних наук, 6 кандидатів технічних наук; 5 співробітників мають звання професора, 6 – доцента.

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Зараз показуємо 1 - 20 з 459

Advantages of using channels with different corrugation height in the plate heat exchangers
(Технологический центр, 2018) Khavin, G. L.; Babak, Tatyana
In the case when there is a difference in consumption on the side of the cold and hot heat carriers, the use of channels with the same corrugation height in one heat exchanger leads to a decrease in velocity of the heat carrier on the side with low consumption. Low velocity contributes to appearance of deposits on the heat transfer surface, which leads to disruption of operation mode of the apparatus and a forced clean-up stop. In case of using channels with a different corrugation height (cross-section area), velocities in the channels are aligned and intensity of emergence and growth of contamination falls sharply. It also allows us to reduce the heat transfer surface area of the apparatus and fully implement permissible pressure losses on the sides of the heat exchanger. For designing of heat exchangers of this structure, the authors developed the mathematical model that allows making calculations of heat exchangers for assigned operation conditions with the use of geometrical data of the plates, thermophysical properties of heat carriers and criterial equations for plates of the selected type. The calculation algorithm involves determining of the ratio between corrugation heights. Practical value lies in the fact that the proposed approach makes it possible to extend the service life of the heat exchanger prior to a maintenance stop. This enables provision of continuity of the technological process and decreases operation costs. Calculation of the heat exchanger of hot water supply by the parallel scheme of attachment to heating networks and the heat exchanger of stage 1 of the two-stage hybrid scheme was presented. Calculation data indicate a decrease in the heat transfer surface area compared to heat exchangers with channels of equal height, full realization of pressure losses and their alignment in the channels, which facilitates an increase in resistance to contamination of the plates’ surface. Calculation showed the advantage of using apparatuses with channels of different cross-section area. The higher the ratio between consumption of heat carriers in the channels, the stronger this advantage.
Design and numerical simulation of the new design of the gripper for manipulating of the rotational parts
(Polish Society of Technical Diagnostics, 2018) Basova, Ye. V.; Nutsubidze, K.; Ivanova, M. S.; Slipchenko, S.; Kotliar, A. V.
The analysis of the field of application of gripper is carried out. Are allocated perspective areas of development of a robotics. The main difficulties in the application of kinematic schemes for gripping devices with rotary finger movement are described. The prospective application of the kinematic scheme of the gripper with a straight-parallel plane-parallel motion of the fingers is proved when manipulating an object of the "shaft" type. A new scheme of a gripper with a rectilinear plane-parallel finger movement is presented. Its design is simpler and cheaper than known devices of this type. The capability of the gripper design in the engineering analysis environment has been fulfilled. Numerous computer studies of both individual design elements and pairs of objects that are in interaction have confirmed the operability of the developed design. It is established that the frictional force in the mobile components of the gripper design is insignificant, which will not create the prerequisites for a significant increase in size.
Determination of the coefficient sliding friction value in the contact the cutting tool-composite
(Національний технічний університет "Харківський політехнічний інститут", 2022) Khavin, G. L.; Hou, Zhiwen
One of the most important characteristics in calculating the cutting tool wear in contact with the processed composite is the friction coefficient. In most calculations, including the finite element method, the friction coefficient is traditionally set as a constant, the value of which is often taken from experience without any reason. However, when machining reinforced composites, there are too many mechanical and technological factors that have a very strong effect on the friction coefficient value. This influence is associated not only with the initial heterogeneity of the composite, but also with the constant actual change in the contact conditions over time, caused by the wear of the tool cutting part. The friction coefficient value in real conditions of contact interaction has a very complex physical content due to the presence of products of fibers and binder destruction in the contact, partial a binder melting at a temperature in contact, and the unevenness of the cut fibers presence. This article presents a formulation that allows you to calculate the value of the friction coefficient depending on the volumetric content and the inclination angle of the reinforcing elements. It is proposed to calculate the friction coefficient value as the product of two factors, one of which is responsible for the filler volumetric content, and the other for the reinforcing elements orientation. The calculations use the mixtures theory relations. The presented expressions for calculations are based on the use of limited experimental information presented by various authors. The available data are often contradictory and relate, as a rule, to predicting the processed surface quality of unidirectional glass and carbon fiber reinforced plastics. At the same time, the friction coefficient value in the calculations has a significant impact on the representation of tool wear and life. The model does not take into account the contact pressure effect, mutual sliding velocity and temperature on the friction coefficient value, which will be the subject of further research in this direction.
Forecasting of the productivity of parts machining by high-speed milling with the method of half-overlap
(Polish Society of Technical Diagnostics, 2018) Dobrotvorskiy, S. S.; Basova, Ye. V.; Ivanova, M. S.; Kotliar, A. V.; Dobrovolska, L. G.
In the article the technology of high-speed milling was observed as a key to the most promising methods of engineering products machining. It is indicated that the correct choice of the strategy for moving the cutting tool in the manufacture of products is the basis for ensuring the desired surface quality of the workpiece and its high processing efficiency. A review of the work devoted to the diagnosis of high-speed processing strategies was performed. Based on the up-to-date knowledge of the physics of the process of establishing of a qualitative surface, the article proposes to consider a new technology of high-speed milling with half-overlap. As the main idea of this technology, it is suggested to consider the work of the deformation component of cutting process as the main component of the complex energy-intensive process of high-speed milling. In addition, the paper suggests a technique for estimating the productivity of machining by the method of high-speed milling with half-overlap. It is theoretically justified that the specific productivity of the proposed technology is quite high Q=12.5÷4.2 cm2/min and depends on the technological regimes. The place of technology of high-speed milling with half-overlap in the technological process of manufacturing details of any complexity was noted. The area of further research is indicated.
High speed machining – современный метод механической обработки
(Національний технічний університет "Харківський політехнічний інститут", 2010) Добротворский, Сергей Семенович; Иващенко, Е. В.
Проведён анализ современного состояния и принципов высокоскоростной механической обработки и обоснованы области её эффективного применения; рассмотрены особенности образования высоты профиля неровностей при построчной обработке высокоскоростным фрезерованием плоских поверхностей.
The innvestigation of the process streams integration in the multieffect evaporation plant for the concentration of sorghum syrup
(Технологический центр, 2018) Babak, Tatyana; Golubkina, Olga; Ponomarenko, Yevgeniya; Solovey, Ludmila; Khavin, G. L.
The study on the integration of heat streams of the evaporation station for sorghum syrup concentrating is presented. The relevance of the research is is why the research, aimed at reducing the consumption of external energy and enhancing operating efficiency, is relevant and has practical value. The main purpose of the work is to create a scientifically substantiated design with enhanced economic indicators of operation, ensuring saving in consumption of hot utility (steam) and cooling water. The problem was solved using the pinch-analysis. Heat streams, requiring heating and cooling, were identified, and the alternative project based on the selection of the value of minimum temperature difference ΔTmin, was created. This value was calculated and substantiated based on the data on thermal streams. The stream of condensate of return steam, the heat excess of which had not been used so far, was added to the system. For the alternative project, the layout of heat exchange equipment was proposed, calculation of plate heat exchangers was performed. The designed network of heat exchangers made it possible to decrease the annual steam consumption by 18 %. Cost-effectiveness analysis was conducted by comparing the indicators for two of the projects of the syrup preheating department for the evaporation station. The proposed alternative project saves power consumption of cooling water by 35.9 kW, of heating vapor steam – by 60.5 kW. At the interest rate of profit tax of 18 %, implementation of the alternative project will pay off in 4 months. As a result, net annual gain of an enterprise is planned to increase by 16 %, at virtually the same payback period of the projects. Application of the methods of heat streams integration made it possible to develop an effective project of sorghum syrup preheating before evaporation and ensure saving of external utilities.
Investigation of Elastic Displacements of Two-Stage Reamers by the Finite Element Method
(National Technical University "Kharkiv Polytechnic Institute", 2021) Ivanova, M. S.; Aslam, Muhammad Ashar
JavaMach Cluster – единая платформа образования, науки и производства
(НТУ "ХПИ", 2017) Сокол, Евгений Иванович; Добротворский, Сергей Семенович; Пермяков, Александр Анатольевич; Гнучих, Сергей Сергеевич
Mathematical Modeling of Elastic Displacements of a Stepped Drill Axis in the Presence of Eccentricity of its Steps
(National Technical University "Kharkiv Polytechnic Institute", 2021) Ivanova, M. S.; Hourani, Youssef El
Modeling npp power unit steam turbine installation steam separatorsuperheater temperature characteristics by interval analysis methods
(Національний технічний університет "Харківський політехнічний інститут", 2020) Potanina, Tetiana Volodymyrivna; Yefimov, Olexander Vyacheslavovych; Khavin, G. L.
The determination of the temperature characteristics of one of the significant elements of the wet-steam turbines of nuclear power units – the steam separator-superheater is considered: namely the construction of the dependence of the temperature of the heated steam at the outlet of the second stage on the changing load of the power unit. Modeling is carried out taking into account the error limitation without reliable information about its distribution. To evaluate the coefficients of empirical dependence, constructed according to the results of experimental data, it is proposed to use numerical methods of interval analysis. The interval approach allows building a refined tube, guaranteed to contain acceptable dependences of the temperature of the heated steam on the electric power of the power unit. In a situation of data uncertainty and limited errors, numerical methods of interval analysis allow creating models of processes and equipment of NPP units with the maximum possible correspondence to a real object.
Nanotechnology in aviation and general machine building industry
("Planeta-Print" Ltd, 2020) Kostyk, G. I.; Popov, V. V.
On the basis of the analysis of the results of processing critical and complex parts of aggregates, difficult-to-process materials and the most commonly used types of processing have been selected: turning and milling with cutting tools with interchangeable inserts hardened by various methods. The second section is devoted to the theory of hardening of radiation sources and parts by plasma -ion processing, where all the main sources and sinks of heat are taken into account. In addition, the crystallization energy and the influence of quantum- mechanical effects were taken into account in the theoretical determination of the thermophysical and thermomechanical characteristics of materials, as well as different speeds of heat propagation (from the speed of light to the speed of sound). Taking into account these effects, the boundaries of the adequacy of certain methods for finding the technological parameters for producing nanostructures are found. A similar study was carried out for the case of the action of conventional pulsed lasers (operating time 10-7 - 10-4 s) and femtosecond pulsed lasers, where problems with different speeds of heat propagation from speeds equal to the speed of light to the speed of sound are also considered, the energy nanograin formation, and quantum-mechanical effects in the theoretical determination of the values of the thermophysical and thermomechanical characteristics of the X-ray material and parts. The adequacy of the model in determining the grain size is shown. For the combined technology (Section 4) based on plasma-ion, ion-beam, electron-beam and laser processing, the possibility of implementing such a technology to obtain unique operability and efficiency of a cutting tool and resource of parts by creating hardened layers up to 1-2 mm is shown. A computational model of the performance of this technology is given, which also allows you to get the performance of each of the technologies considered. Experimental studies of the physicomechanical characteristics of coatings and materials with coatings and nanostructured layers have been carried out The decisive influence of grain size on them is shown. The characteristics of the cutting tools were investigated: the efficiency of the forming of the part (the removed volume of material during the durability period), the resistance of radiation sources, and the processing productivity (Section 6). A significant effect of grain size in the coating and RI material on these values was found. The seventh section is devoted to the creation of the concept and principles of designing the chemical composition and type of hardening in order to obtain maximum erformance and efficiency of shaping the surface of parts. It was experimentally shown that to obtain the most effective composition of the hard alloy, its hardening and taking into account the adhesive interaction of the material RI, coating and the processed material. For milling, successful types of modification of the RI material were obtained, and for turning based on the results of other authors, agreement with the theory was obtained. In conclusion, practical recommendations on the use of materials from the monograph are given. In applications for plasma-ion, ion-beam, and laser technologies, the results on the production of nanostructures on various X-ray materials (tool steels, high-speed steels, hard alloys, and polycrystalline superhard materials) are presented, which make it possible to evaluate the technological parameters of their formation.
New strength for recovery of geared circles
(Національний технічний університет "Харківський політехнічний інститут", 2020) Gasanov, Magomediemin; Permyakov, Alexander; Klochko, Alexander; Shelkovoy, Alexander
The subject matter of the research is issues related to the optimization of the technology for reconditioning large-size high precision gear rims of the drives of mining complexes, mine lifting equipment, heavy vehicles; these issues are a perspective trend for reducing the cost of reconditioning and operation of expensive unique equipment. The goal is to ensure intensifying production processes, increasing workloads and speeds, reducing the deterioration of high precision gear rims. The objective is to develop a new technology to optimize reconditioning large high precision gear rims. To achieve this, the following method is suggested – to machine gear rims after they have been surfaced by pre-milling with special hob cutters with a prominence and by final machining the teeth with special cutters equipped with hardmetal inserts that process teeth along the line of engagement, which does not require making full-length cutting teeth and increases the quality of machining, the durability of hardmetal milling cutters. The following results are obtained. Conclusions. The technology for the optimization of reconditioning large high precision gear rims with the use of special and universal hardmetal single- and double-flute cutters that have both re-sharpened cutting elements and disposable rotary tools was developed and introduced.
Possibility of Heat Pump use in Hot Water Supply Systems
(2016) Babak, Tatyana; Duić, Neven; Khavin, G. L.; Boldyryev, Stanislav; Krajačić, Goran
The problem of modernization of the heat module with two-stage mixing scheme connection of hot water supply by installations of the heat pump during interheating period is considered. Heating water of the in-house circuit of the building heating system is used as a heat source for heat pump. The district cooling of the residential areas is possible through the heaters during the summer. R600 refrigerant is chosen for heat pump for its environmental-friendliness and low-pressure of evaporation and condensation. The economic calculation is made for interheating period comparing the operation with and without heat pump. This paper advances selection of optimum amount of heat to be recovered during low potential heat utilisation and targets for heating and cooling capacities.
Project scope optimization model and method on criteria profit, time, cost, quality, risk. Integrating Project Management Standards
(Elsevier Ltd., 2012) Kononenko, Igor; Fadeyev, Valeriy; Kolisnyk, Mariia
The paper presents a mathematical model of the structural optimization of the project scope, which includes five objective functions. One of the functions reflects the profit for the entire project life cycle. The others reflect the time of its realization, the cost of the project, the value of the generalized indicator of project product quality and the risk assessment associated with the project. The model takes into account the restrictions on the lack of financial debt after each phase completion, the duration of the project, the quality of the separate stages products. It is assumed that the project scope is given in the form of a network model with the alternatives of the work execution. The suggested model is a multi-objective, dynamic, containing Boolean variables, algorithmic and analytical objective functions and constraints. A method of multi-objective structural optimization of the project scope with constraints was proposed to solve the problem.
Quality assurance of the surface layer of processing parts by vibration hardening
(ТОВ "Планета-Прінт", 2021) Dobrotvorskiy, Sergiy; Dobrovolska, L.; Prikhodko, V.
Simulation of the contact temperature in the cylindrical plunge grinding process
(Polish Society of Technical Diagnostics, 2020) Syzyi, Yu.; Ushakov, O.; Slipchenko, S.; Basova, Ye. V.; Ivanova, M. S.
The intensifying of the manufacturing process and increasing the efficiency of production planning of parts are the first-priority task in modern manufacturing. The use of various methods for controlling the cutting force and temperature in cutting zone under cylindrical infeed grinding and studying its impact on the quality and accuracy of parts machining can improve machining efficiency. The peculiarity of the work is to the proposal to consider a fast-moving source like a heat source in the plunge grinding process. Based on the Peclet analysis, the further development of the method for calculating the allowance removed at each workpiece revolution by optimizing the cylindrical plunge grinding cycle parameters has been justified. The methodology for determining the optimal parameters of a cylindrical plunge grinding cycle, which based on a simulation of the dynamics of such a process represented by a three-mass model of a 3M151 circular grinding machine has been used in research. The practical value of the study lies in studying the ways of improving the grinding performance of the parts by intensifying cutting modes and optimizing the structure of machining cycles.
Technological provision of tribological properties of the surface of stainless steel blades by means of structuring by high-speed milling and laser impact
(2023) Kharchenko, Oleksandr
The aim of this work is to develop technological support for the tribological properties of the surface of stainless steel blades, creating LIPSS structures on their surface by structuring the surface through high speed milling and laser influence.
To the creation of specialized software for the purpose of data synchronization between small machine building enterprises
(ТОВ "Планета-Прінт", 2021) Dobrotvorskiy, Sergiy; Basova, Y.; Zinchenko, A.; Balog, M.; Edl, M.
Абразивні круги для імпульсного зубошліфування на органічних матрицях
(Донбаська державна машинобудівна академія, 2019) Пермяков, Олександр Анатолійович; Гасанов, Магомедємін Ісамагомедович; Пермінов, Євген Віталійович; Стрелець, О. С.; Поварніцин, Д. А.
Автоматизация проектирования тепловых пунктов системы централизованного теплоснабжения
(Национальный технический университет "Харьковский политехнический институт", 2016) Хавин, Валерий Львович; Арсеньева, Ольга Петровна; Мацегора, Александр Иванович; Кусаков, Сергей Константинович; Бочарников, Игорь Александрович; Василенко, Александр Анатольевич
Розроблено автоматизовану систему проектування теплових пунктів на основі пластинчатих теплообмінників. Представлено їх класифікацію за встановленим обладнанням. Надана номенклатура системи управління роботою теплового пункту та допоміжного обладнання.

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