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Документ Theoretical justification of rational conditions for produsing diamond wheels on ceramic bonds(Національний технічний університет "Харківський політехнічний інститут", 2022) Fedorovich, Vladimir; Ostroverkh, Y.; Pyzhov, Ivan; Lavrinenko, V.The article describes the results of theoretical studies using 3D finite element modeling, which made it possible to determine the rational characteristics of diamond wheels on ceramic bonds. The influence of the parameters of the diamond-bearing layer on the change in its stress-strain state in the sintering zone of the diamond wheel has been studied. The results of finite element and microlevel 3D modeling of the sintering process of a ceramic-matrix diamond-containing composite are analyzed. The influence of the technological parameters of the process and the characteristics of the diamond wheel on the integrity of the grains during sintering was established, on the basis of which practical recommendations were given for the selection of diamond compositions with rational properties.Документ The methodology of sharpening of blade tools made of superhard materials(Національний технічний університет "Харківський політехнічний інститут", 2019) Fedorovich, V.; Ostroverkh, Y.; Kozakova, N.High durability of the blade tool from superhard materials (SНM), which have unique physical and mechanical properties, creates the prerequisites for its effective use in automated production. However, the widespread use of such tools is constrained by its relatively low reliability during operation. This disadvantage is due to the imperfection of the processes of obtaining SНM: the presence in it residual stresses, internal defects, which appear even after sharpening and thermo-activated finishing. The processes of sharpening of tool blade from superhard materials and cutting with this tool are characterized by high levels of contact pressures and temperatures in the treatment area. Therefore, it seems inappropriate to choose sparing conditions for its sharpening and refinement to ensure the defect of these processes. In connection with this, a new methodological approach is proposed, which makes it possible to determine the cutting conditions and other conditions for sharpening and finishing the SНM blade tool, in which material defects are revealed even at the tool manufacturing stage. To this end, in the software packages COSMOS, ANSYS, NOSTRAN, Third Wave AdvantEdge, thermo-force stress in the cutting edge of the tool simulated under extreme conditions while its operation. This simulations are the initial data for solving the inverse problem – finding conditions (speed, cross feed, normal pressure in the contact) and other diamond grinding modes (physical and mechanical properties of the bond and diamond grains of the wheel, grain size and concentration) according to the well-known stress-strain state cutter from SНM in extreme conditions of its operation. The proposed methodology allows rejecting defective cutters at the stage of their manufacture, thereby increasing the reliability of operation of blade tool from superhard materials.Документ Прогностический сопоставительный расчет рабочего ресурса алмазно-абразивных инструментов из шлифовальных порошков с различным заострением зерен(Национальный технический университет "Харьковский политехнический институт", 2018) Гуцаленко, Юрий ГригорьевичВ геометрически определенной системе представления режущей части алмазного зерна и его расположения в шлифовальном круге, применительно к высокопроизводительным технологиям устойчивого алмазного шлифования со стабильно развивающимся обновлением изнашиваемого режущего рельефа показано технологическое превосходство в ресурсной работоспособности алмазних кругов с более заостренными зернами.Документ Simulation of effects of metal phase in a diamond grain and bonding type on temperature in diamond grinding(Springer-Verlag London, 2012) Mamalis, A. G.; Grabchenko, A. I.; Fedorovich, V. A.; Kundrak, J.Manufacturing diamond wheels on various bonds is a relatively high-cost process, requiring high labour and high consumption of expensive diamond grains but yielding relatively low productivity. With better knowledge of the various factors involved in the sintering process, the most efficient combinations can be found, leading to higher productivity. Currently, there are no scientifically based recommendations for the choice of the rational combinations of strength, brand of grain, graininess and concentration with the physical–mechanical properties of bonds. The aim of this research is the development of a technique for the theoretical definition of an optimal combination of strength properties of diamond grains and bond to provide maximum retention of diamond grain integrity during the process of diamond wheel manufacture. This is investigated using 3D simulations of the deflected mode of the sintering area of the wheel's diamond bearing layer.Документ Определение оптимального сочетания компонентов в спекаемом слое алмазно-абразивного инструмента(НТУ "ХПИ", 2018) Федорович, Владимир Алексеевич; Островерх, Евгений Владимирович; Козакова, Наталия ВитальевнаПредставлены результаты теоретического определения структуры и физико-механических свойств алмазно-абразивных инструментов на этапах их проектирования и изготовления. Путем расчетов методом конечных элементов напряженно-деформированного состояния зоны спекания алмазно-абразивного инструмента без длительных и трудоемких экспериментальных исследований можно определять оптимальные характеристики алмазных кругов.Документ Моделирование процесса правки алмазных кругов алмазными роликами(НТУ "ХПИ", 2017) Федорович, Владимир Алексеевич; Островерх, Евгений Владимирович; Козакова, Наталия Витальевна3D исследование процесса правки алмазных шлифовальных кругов, позволяющее получить качественное и количественное представление о его физико-механических особенностях, дает возможность оптимизировать процесс правки и увеличить работоспособность правящего инструмента.Документ 3D моделирование напряженно-деформированного состояния процесса алмазного шлифования(НТУ "ХПИ", 2017) Федорович, Владимир Алексеевич; Пыжов, Иван НиколаевичРассмотрены вопросы, связанные с особенностями формирования напряженно-деформированного состояния системы "связка – алмазное зерно – металлофаза – обрабатываемый материал". Показана существенная роль концентрации зерен в алмазоносном слое круга и высоты их выступания над уровнем связки. Установлена зависимость напряжений в системе от указанных факторов и даны практические рекомендации.Документ Моделирование процесса спекания алмазных кругов на металлических связках с целью определения их рациональных характеристик(НТУ "ХПИ", 2017) Грабченко, Анатолий Иванович; Федорович, Владимир Алексеевич; Островерх, Евгений Владимирович; Козакова, Наталия ВитальевнаПредставлены результаты трехмерного моделирования процесса изготовления алмазно-абразивного инструмента, позволяющие определить взаимовлияние технологических параметров и физико-механических свойств компонентов спека на целостность алмазных зерен и их эффективное использование при шлифовании.Документ Exploitative destruction features for detonation ultra-dispersed diamonds of initial metallic protection for abrasive powder grains to diamond-spark grinding tools(Constantin Brancusi University of Targu Jiu, 2015) Gutsalenko, Yury; Iancu, Cătălin; Bratan, SergeyThe problem of exploitation of diamond grinding wheels with metal coating for their grains including detonation ultra-dispersed diamonds to increase functional reliability to maintain the initial integrity of grains in the pressing and sintering of diamond-metal composites in the tool production is considered. One problem is that the presence of detonation ultra-dispersed diamonds in the grain metal coating of diamond powders not only improves the coating functional reliability in protection from destruction in the subsequent pressing and sintering in the production tool, but also resistance of such coating to the opening of the diamond cutting basis of the grains on the grinding wheel working surface that come into working contact with the material being processed. An analysis of the features of an effective exploitative destruction of detonation ultra-dispersed diamonds in the metal coating using electric current in the tool of the diamond-spark grinding processes is presented.Документ 3D simulation of diamond grinding process by finite element method(НТУ "ХПИ", 2011) Mamalis, A. G.; Grabchenko, A. I.; Fedorovich, V. A.; Kundrak, J.; Babenko, A. E.Process of manufacture of diamond wheels on various bonds is characterized by high labour content and low productivity, high consumption of expensive diamond grains and, as consequence, the high cost price of a further operational process of diamond wheels. It is necessary to attain reliability and quality heightening at diamond-abrasive tool manufacture without which its effective application in production is impossible. Production of diamond - abrasive tool is founded on establishment of physical and technological regularities of sintering process of diamond-bearing layer. Now there are no scientifically based recommendations for choice of the rational combinations of strength, brand of grain, graininess, concentration with the physical-mechanical properties of bonds. The aim of given research is the development of the technique of the theoretical definition of an optimal combination of strength properties of diamond grains and bond at which ones retention of diamond grain integrity at the process of manufacture of diamond wheel is ensured by using 3D simulations of deflected mode of sintering area of its diamond-bearing layer.