Збірники наукових праць ЦНТУ
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Item Удосконалення процесу обробки тіл обертання електричною дугою(ЦНТУ, 2020) Боков, В. М.; Сіса, О. Ф.; Юр’єв, В. В.; Bokov, V.; Sisa, O.; Yuryev, V.; Сиса, О. Ф.; Юрьев, В. В.Запропоновано та досліджено високопродуктивний спосіб розмірної обробки тіл обертання електричною дугою в гідродинамічному потоці робочої рідини та пристрій для його реалізації, що покращують умови праці оператора за рахунок усунення ефекту розбризкування робочої рідини та усунення світлового ефекту від горіння дуги в зоні обробки, а також підвищують довговічність роботи електродотримача. In modern mechanical engineering, electrical discharge machining (EDM) methods are widely used for machining bodies of rotation from difficult-to-machine materials. Those methods ensure sparing cutting and make it possible to machine any electrically conductive material irrespective of its physical and chemical properties, in particular hardness. There is a known method for dimensional machining of bodies of rotation with electric arc using a wire electrode tool that is pulled along in the machining area thus "compensating" for that tool's EDM wear and tear. The machining accuracy is therefore significantly heightened. However, when implementing this method, an effect of splashing the working fluid outside the working area of the machine and a pronounced luminous effect from the burning of the electric arc in the machining area are observed. That worsens the working conditions. In addition, when pulling the wire electrode tool along the convex surface of the electrode holder, the sliding friction arises, which eventually leads to mechanical destruction of the contact point. As a result, a deep kerf is formed on the electrode holder. When the depth of the kerf reaches the diameter of the wire electrode tool, the destruction of the electrode holder by the electric arc begins. Consequently, the durability of the electrode holder in the known method is unsatisfactory. A method of dimensional machining of bodies of rotation with electric arc using a wire electrode tool with the immersion of the machining area in the working fluid has been proposed, which makes it possible to improve the working conditions of the operator by eliminating the effect of fluid splashing and removing the luminous effect of arc burning in the machining area. In addition, it has been proposed to make the electrode holder in the form of a roller that rotates with a guide groove for the wire electrode tool, while the nozzle for creating the transverse hydrodynamic fluid flow has been proposed to be mounted in a separate fixed housing that is adjacent to the electrode holder. This technical solution replaces the sliding friction with the rolling one thus enhancing the durability of the electrode holder. Mathematical models of the process characteristics of the DMA-process (dimensional machining with electric arc) for bodies of rotation using a wire electrode tool with the immersion of the machining area in the working fluid have been obtained that make it possible to control the machining productivity, the specific machining productivity, the specific electric power consumption, and the roughness of the surface machined. Предложен и исследован высокопроизводительный способ размерной обработки тел вращения электрической дугой в гидродинамическом потоке рабочей жидкости и устройство для его реализации, которые улучшают условия работы оператора за счёт устранения эффекта разбрызгивания рабочей жидкости и устранения светового эффекта от горения дуги в зоне обработки, а также повышают долговечность работы электрододержателя.Item Розмірна обробка електричною дугою бічної поверхні зносостійкого інструменту(ЦНТУ, 2018) Сіса, О. Ф.; Пукалов, В. В.; Юр’єв, В. В.; Сиса, О. Ф.; Юрьев, В. В.; Sisa, O.; Pukalov, V.; Yuryev, V.Виконано обґрунтування технологічної схеми формоутворення зовнішньої бічної поверхні пуансону, способом розмірної обробки електричною дугою з урахуванням особливостей фізичних механізмів їх утворення та гідродинамічних явищ в міжелектродному проміжку. Встановлені аналітичні зв’язки технологічних характеристик процесу розмірної обробки електричною дугою твердого сплаву ВК8 з режимами обробки і геометричними параметрами. Выполнено обоснование технологической схемы формообразования внешней боковой поверхности пуансона, способом размерной обработки электрической дугой с учетом особенностей физического механизма образования и гидродинамических явлений в межэлектродном промежутке. Установлены аналитические связи технологических характеристик процесса размерной обработки электрической дугой твердого сплава ВК8 с режимами обработки и геометрическими параметрами. The article is devoted to development of the technology and equipment for rough machining of hard-face puncheon's lateral surface with electrical arc as a highly efficient alternative to the conventional methods of rough machining. In order to extend the durability period of the sheet material blanking die, the strong wearproof materials should be used. The hard-face axial puncheons are used due to high strength, hardness and wearproofness. The puncheons are made of the cylindrical hard-face cores, with diameter ranging from 2...20 mm. Then they are grinded. The cores are made of hard alloys with wolfram carbide grain size less than 1 µm, and the 8...25% of cobalt binding content. The cores are produced by the hard-face powder pressing and further sintering in vacuum-compressor furnace. When sintering the cores shrink, followed with the contraction process. The core bending may reach up to 0.35 mm and more. Such curve cores are not used for grinding. Therefore, the problem is to find some optional technologies of treating the hard-face cores for the puncheons. It is suggested to remove the puncheon's lateral surface with electrical arc at the stage of the hard-face blank treatment. This allows removing large allowances of material along with the shortest treatment time. It is suggested to produce the puncheon lateral surface with roughness of Ra = 16…30 µm following rough machining. Thus, the large allowances of material are removed with the shortest treatment time. Here, the treatment cycle of the hard-face puncheon's lateral surface reduces by 1.4...1.8 times. The substantiation was made for the process flow diagram covering fabrication of the hard-face puncheon's lateral surface subject to specifics of the physical mechanism of formation and the hydrodynamic phenomena in the inter-electrode gap. The analytical links were determined between the technological specifications of the process featuring ВК8 alloy rough machining with electrical arc, the processing modes and geometrical parameters. The resulting models enable managing the capacity, specific capacity, specific consumption of electric power and the treated surface accuracy, along with forecasting and optimizing these parameters. The technical solution is offered enabling to expand the processing capacities of the hard-face puncheon's production.Item Розмірна обробка електричною дугою бічної поверхні напрямного ролика з композиційного матеріалу на основі реліту(ЦНТУ, 2018) Сіса, О. Ф.; Пукалов, В. В.; Свяцький, В. В.; Сиса, О. Ф.; Свяцкий, В. В.; Sisa, O.; Pukalov, V.; Sviatskyi, V.Виконано обґрунтування технологічної схеми формоутворення зовнішньої бічної поверхні напрямного ролика, способом розмірної обробки електричною дугою з урахуванням особливостей фізичних механізмів їх утворення та гідродинамічних явищ в міжелектродному проміжку. Встановлені аналітичні зв’язки технологічних характеристик процесу розмірної обробки електричною дугою твердого сплаву «Реліт» з режимами обробки і геометричними параметрами. Выполнено обоснование технологической схемы формообразования внешней боковой поверхности направляющего ролика, способом размерной обработки электрической дугой с учетом особенностей физического механизма образования и гидродинамических явлений в межэлектродном промежутке. Установлены аналитические связи технологических характеристик процесса размерной обработки электрической дугой твердого сплава «Релит» с режимами обработки и геометрическими параметрами. The article is dedicated to development of technology and equipment of rough machining method by electric arc of a guide roller side surface, as high performance alternative to traditional methods of rough machining. During operation, the damage to the surface of the hard alloys guide roller caliber occurs by abrasion and chipping of carbide particles. The development of net shaped roll marks occurs by the occurrence of hotbeds of accelerated cluster abrasion and chipping of smaller particles with subsequent growth of these areas and unification in a closed net shaped roll marks. The turned out particles of hard alloy leave the machining marks on the wire, in such a worn the hard alloy rolling roller does not meet the specified dimensions and it is reground to a smaller diameter by grinding of diamond tool on the rough machining stage. It is proposed on the stage of rough machining to remove the worn-out profile of a guide roller side surface with help of dimensional electric arc, which allows you to remove big allowances of material at the lowest treatment costs. It is suggested to get the lateral surface by dimensional electric arc with a given roughness of Ra = 10..20mkm, which allows you to take great allowances material at the lowest cost processing time.In this case, the processing cycle of hard alloy side surface decreased of 1,4…2,6 times. The justification of technical scheme of forming the guide roller side surface by electric arc sizing method is done taking into account features of physical formatting mechanism and hydrodynamic phenomena in the electrode gap. The analytical communication of technological characteristics of rough machining process by electric arc made of composite material, based on relit, with the modes of processing and geometric parameters are established. The obtained models allow to control the productivity and specific productivity, specific electricity consumption, quality and surface accuracy which is processed, predicted and optimized given characteristics. A technical solution is proposed that allows to expand the technological possibilities of processing the guide roller.Item Технологія виготовлення зовнішньої бічної поверхні катків гранулятора(ЦНТУ, 2017) Сіса, О. Ф.; Пукалов, В. В.; Кислюк, О. В.; Sisa, О.; Pukalov, V.; Kislyuk, О.Виконано обґрунтування технологічної схеми формоутворення зовнішньої бічної поверхні катка гранулятора, способом розмірної обробки електричною дугою з урахуванням особливостей фізичних механізмів їх утворення та гідродинамічних явищ в міжелектродному проміжку. Встановлені аналітичні зв’язки технологічних характеристик процесу розмірної обробки електричною дугою сталі ШХ15СГ з режимами обробки і геометричними параметрами. The article is dedicated to the development of technology and equipment a roller of granulators processing with dimensional electric arc as high-performance alternative to traditional methods of processing. It is suggested to get the lateral surface by dimensional electric arc with a given roughness of Ra = 6,3..22mkm, which allows you to take great allowances material at the lowest cost processing time. In such a case the cycle of matrix processing decreases in 4,1-8,2 times. The objectivity of technological schema the roller of a granulator by the method of dimensional processing by electric arc with consideration of specialties of physical mechanism of creation and hydrodynamic phenomena in electrode period was performed. The analytical connections of technological processing characteristics of sized processing by electrical arc of steel SHH15SG were established, with the modes of processing and geometrical parameters.Item Технологія виготовлення порожнин високоміцних гайок спеціального призначення(ЦНТУ, 2017) Сіса, О. Ф.; Пукалов, В. В.; Юр’єв, В. В.; Sisa, O.; Pukalov, V.; Yuryev, V.Виконано обґрунтування технологічної схеми формоутворення поверхонь порожнини високоміцної гайки спеціального призначення, способом розмірної обробки електричною дугою з урахуванням особливостей фізичних механізмів їх утворення та гідродинамічних явищ в міжелектродному проміжку. Встановлені аналітичні зв’язки технологічних характеристик процесу розмірної обробки електричною дугою сталі 20Г2Р з режимами обробки і геометричними параметрами. The article is devoted to the development of technology and equipment for the method of electric arc machining of cavities of high-strength screw-nuts for special purposes, as a highly effective alternative to traditional methods of processing. In the conditions of a single and small-scale production, high-strength nuts of special purpose with an internal cavity under a special key for tightening are used to assemble and fasten the critical elements of mining equipment, therefore it is economically disadvantageous to use the technology of stamping such nuts because of the high cost of the die tooling. The technology for manufacturing of special screw-nuts consists of two basic operations: obtaining a special nut billet and forming an internal special profile. An important factor in increasing the load-bearing capacity of high-loaded high-strength screw-nuts is to increase the elasticity of the thread. This is ensured by the grade of material and the quality of the steel billet. When developing technology and equipment, it is necessary to take into account the conditions that will ensure the production of high-quality threads and the formation of a reinforced cavity under a special tightening key with an appropriate surface roughness. Therefore, the method of dimensional processing by electric arc makes it possible to obtain hardened cavities with an appropriate roughness for a special tightening key. It is established that the optimal parameters of the walls of the cavities of high-strength screw-nuts of special purpose at processing capacity M = 6010 mm³ / min., dimensional electric arc, there is a roughness Ra = 6,3..21 mkm, which provides the necessary geometric dimensions and surface quality. It is proposed to receive cavities of high-strength screw-nuts of special purpose with a dimensional electric arc with a given roughness Ra = 6,3..21 mkm, side walls, which allows you to shoot large material allowances with the least time spent on processing. At the same time, the treatment cycle of the cavity of high-strength screw-nuts for special purposes decreased 10 times. The feasibility study of the technological scheme for the formation of cavities of high-strength screw-nuts of a special purpose by the method of dimensional processing by an electric arc is made, taking into account the features of the physical mechanism of formation and hydrodynamic phenomena in the interelectrode gap. Analytical links of technological characteristics to the process of dimensional processing by an electric arc of steel 20G2Р, with processing modes and geometrical parameters are established.Item Обробка електричною дугою матриць для брикетування(КНТУ, 2015) Сіса, О. Ф.; Sisa, OlehВиконано обґрунтування технологічної схеми формоутворення бічних поверхонь утвору матриць для брикетування способом розмірної обробки електричною дугою з урахуванням особливостей фізичних механізмів їх утворення та гідродинамічних явищ в міжелектродному проміжку. Встановлені аналітичні зв’язки технологічних характеристик процесу розмірної обробки електричною дугою сталі Х12МФ з режимами обробки і геометричними параметрами. The article is dedicated to the development of technology and equipment method of packing dies processing with dimensional electric arc as high-performance alternative to traditional methods of processing. Fuel briquettes are formed by pressing force with the pressure up to 500 kN of pre-shredded waste wood and plant in the hole of matrix, where the process of aggregation goes. In the development of equipment and tools it is necessary to take into account the conditions that will ensure the formation of fuel briquettes. The most important parameter for pressing fuel briquettes is the energy which corresponds to the work of frictional forces against the walls of the die hole, since the pressure force transmitted to the side surface, is proportional to pressure in the longitudinal direction. The optimal parameter of the walls of the die hole is the roughness Ra = 3,2..6,3 mkm, which provides the frictional force when unitizing. It is suggested to get the die hole for briquetting by dimensional electric arc with a given roughness of Ra = 3,2..6,3 mkm of the side walls of the matrix, which allows you to take great allowances material at the lowest cost processing time. In such a case the cycle of matrix processing decreases in 4,1-5,2 times. The objectivity of technological schema of die hole formation by the method of dimensional processing by electric arc with consideration of specialties of physical mechanism of creation and hydrodynamic phenomena in electrode period was performed. The analytical connections of technological processing characteristics of sized processing by electrical arc of steel X12MF were established, with the modes of processing and geometrical parameters.Item Розмірна обробка твердосплавних волок(КНТУ, 2014) Сіса, О. Ф.; Осипенко, М. В.; Стебліна, К. В.; Sisa, Oleg; Osipeko, Marina; Steblina, KaterinaВиконано обґрунтування технологічних схем формоутворення поверхонь твердосплавної волоки способом розмірної обробки електричною дугою з урахуванням особливостей фізичних механізмів їх утворення та гідродинамічних явищ в між електродному проміжку. Встановлені аналітичні зв’язки технологічних характеристик процесу чорнової розмірної обробки електричною дугою сплаву ВК8, з режимами обробки і геометричними параметрами. Article is dedicated to the development of technology and equipment of mode of roughing of carbide drawplate by electric arc as an alternative to traditional methods of high performance choice of roughing. During operation, in the hole of drawplate along with uniform abrasion, occurs severe wear, as a consequence of welding of the processed material to the material of drawplate. As a result of the periodic separation of these places the structure obtained by sintering is broken by chipping of the carbide grains. Torn carbide particles leave marks on the wire, with such wear the drawplate does not meet the specified size and it is to bore with larger diameter by the grinding with the diamond tool at the roughing. It is proposed to bore carbide drawplate by dimensional electric arc as at roughing chisel carbide dies dimensional arc of electricity that can take large allowances of material at the lowest time expenditure for processing. At that the machining cycle was down by 4,4-5,2 times. It was made the justifications of the technological scheme of forming of holes of carbide drawplate in the way of sizing by arc taking into account the features of physical formation mechanism and hydrodynamic phenomena in the electrode gap. Analytical roots of technological characteristics of the process of rough sizing with the arc VK8 alloy with treatment regimens and geometrical parameters established.