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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  • Ескіз
    Документ
    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.
  • Ескіз
    Документ
    Wear grinding wheels with precise working surface
    (Національний технічний університет "Харківський політехнічний інститут", 2020) Yakimov, A.; Bovnegra, L.; Uminsky, S.; Tonkonogyi, V.; Shichireva, Y.
    The use of circles with an intermittent working surface is an effective means of increasing productivity and reducing the heat stress of the grinding process. These positive effects are largely determined by the appearance of high-frequency oscillations in the elastic system of the machine, which facilitate the chip formation process and create conditions for continuous selfformation of the cutting microrelief of the working surface of the abrasive tool. However, for certain aggregates of rigidity of the elastic system of the machine, geometric parameters of the macrorelief of the working surface of an intermittent circle, and parameters of the cutting mode, parametric resonance may occur, which is accompanied by catastrophic wear of an abrasive tool and a deterioration in the geometric and physical-mechanical characteristics of the quality of the surface layer of the workpiece. The aim of the work is to study the influence of grinding mode parameters and geometric parameters of the working surface of intermittent abrasive wheels on their dimensional and linear wear, as well as identifying areas of their rational use. It was found that oscillations during intermittent grinding caused by parametric resonance can be significantly reduced or eliminated completely by increasing the rigidity of the elastic system of the machine, using discontinuous circles of a certain geometry, and increasing the peripheral speed of the circle. Based on the experiments to determine the specific wear of the elbore dashed circles, the expediency of their use in deep encryption is substantiated. t is established that to increase dimensional stability of an abrasive tool it is necessary to increase the circular velocity to 40 m / s and to provide in the machines the possibility of preserving the constancy of the circular velocity of the circle as it is worn.