DOI: https://doi.org/10.15802/stp2018/147630

STRUCTURAL ANALYSIS AND RATIONAL DESIGN OF MECHANISMS OF CROSS-ROLL TUBE STRAIGHTENING MACHINES

S. S. Zdanevich, R. P. Pogrebnyak, S. V. Zdanevich

Abstract


Purpose. The article is aimed to perform a structural analysis of the main and auxiliary mechanisms of tube straightening machines, to identify structural and local redundant links in the mechanism schemes, and to offer recommendations on their rational design. Methodology. The solution is realized by means of the theory of mechanisms and machines using structural analysis of the mechanisms of tube straightening machines based on the universal structural theory of O.G. Ozol. Findings. The extended principle of the machine’s mechanism formation, which provides inclusion to the mechanism not only невільних solid bodies, but also the deformed bodies, allows us to consider the structure of machines for pressure processing of metals, taking into account the plastically deformed workpiece. Therefore, such machines include in their composition a deformed workpiece as an integral part of the machine mechanism, whose deformation and addition of certain geometric parameters to it is the reason the tube straightener was created for. Defects in the machine structure are determined by the local and structural redundant links included in the kinematic chains of the mechanisms, which transform the mechanism into a statically undetermined system. Movement of the mechanism with defects in the structure is possible in the presence of gaps or due to deformation of the links. The main mechanism of the tube straightening machine is a mechanism of variable structure, therefore, an analysis for its two states is carried out: before the tube is caught by the rollers and during its straightening. For calculation of the number of mobilities of the outer «roll – tube» pair, it was taken into consideration that most of the coordinates are overlaid with non-retentive links, which contain a fractional number of constraints. Fifteen redundant links were identified in the main mechanism and their amount in the auxiliary mechanisms of the tube straightening machine was established. Originality. The structural analysis of tube straightening machines with the search for redundant links was never performed. A structural analysis of the mechanisms of cross roll tube straightening machine was performed for the first time, taking into account the presence of external fractional links that are superimposed in the «roll-tube» pairs. Practical value. The practical recommendations for eliminating the harmful redundant links that were found in the structural analysis of the main and auxiliary mechanisms of the tube straightening machine were developed.


Keywords


tube straightening machine; structural analysis; redundant links; external fractional links

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References


Dobrov, І. V., & Pogrebnyak, R. P. (2017). Strukturnyy analiz skhem mashin obrabotki metallov davleniem. Visnyk Natsionalnoho tekhnichnoho universytetu «KhPI». Seriia: Problemy mekhanichnoho pryvodu, 25(1247), 43-47. (in Russian)

Zavgorodniy, A. V., & Gribkov, E. P. (2016). Sovershenstvovanie tekhnologiy i oborudovaniya protsessov pravki trub na kosovalkovykh trubopravilnykh mashinakh. Obrabotka materialov davleniem. 2(43), 148-155. (in Russian)

Zdanevich, S. V., Yermokratev, V. A., & Zdanevich, S. S. (2015). Sistemnaya dinamika privodov shestivalkovykh trubopravilnykh mashin. Metallurgical and Mining Industry, 7, 137-142. (in Russian)

Maksileyson, A. M., Sapir, V. I., & Komisarchuk, Y. S. (1971). Trubopravilnye mashiny. Moscow: Mashinostroenie. (in Russian)

Ozol, O. G. (1979). Osnovy konstruirovaniya i rascheta mekhanizmov. Riga: Zvaygzne. (in Russian)

Pogrebnyak, R. P. (2018). Repeated connections in the schemes of link slider-crank mechanism of gripping device. Science and Transport Progress, 4(76), 81-88. doi: 10.15802/stp2018/140547 (in Ukranian)

Rotov, I. S. (2013). Mashiny dlya pravki trub. Konstruktsii, raschety, issledovaniya. Moscow: Publisher Bauman Moscow State Technical University. (in Russian)

Semenenko, Y. L. (1972). Otdelka profiley i trub davleniem. Moscow: Metallurgiya. (in Russian)

Wang, C., Yu, G., Wang, W., & Zhao, J. (2018). Deflection detection and curve fitting in three-roll continuous straightening process for LSAW pipes. Journal of Materials Processing Technology, 255, 150-160. doi: 10.1016/j.jmatprotec.2017.11.060 (in English)

Sarode, V. B., Prashant, D. R., Hiraman, D. R., Chavan Kalyan, V., & Pawar Amol, R. (2017). Modification of straightning machine. International Journal of Modern Trends in Engineering & Research, 4(4),22-29. doi: 10.21884/ijmter.2017.4112.cruei (in English)

Reshetov, L. (1986). Self-Aligning Mechanisms: Reference book. Moscow: Mir. (in English)

Zhang, Z. Q., Yan, Y. H., & Yang, H. L. (2016). A simplified model of maximum cross-section flattening in continuous rotary straightening process of thin-walled circular steel tubes. Journal of Materials Processing Technology, 238, 305-314. doi: 10.1016/j.jmatprotec.2016.07.034 (in English)


GOST Style Citations


  1. Добров, И. В. Структурный анализ схем машин обработки металлов давлением / И. В. Добров, Р. П. Погребняк // Вісник Нац. техн. ун-ту «ХПІ». Серія: Проблеми механічного приводу. – Харків, 2017. – № 25 (1247). – С. 43–47.
  2. Завгородний, А. В. Совершенствование технологий и оборудования процессов правки труб на косовалковых трубоправильных машинах / А. В. Завгородний, Э. П. Грибков // Обработка материалов давлением : сб. науч. тр. – Краматорск, 2016. – № 2 (43). С. 148–155.
  3. Зданевич, С. В. Системная динамика приводов шестивалковых трубоправильных машин / С. В. Зданевич, В. А. Ермократьев, С. С. Зданевич // Металургійна і горнорудна промисловість. – 2015. – № 7. – С. 137–142.
  4. Максилейсон, А. М. Трубоправильные машины / А. М. Максилейсон, В. И. Сапир, Ю. С. Комисарчук. – Москва : Машиностроение, 1971. – 208 с.
  5. Озол, О. Г. Основы конструирования и расчета механизмов / О. Г. Озол. – Рига : Звайгзне, 1979. – 360 с.
  6. Погребняк, Р. П. Повторювані зв’язки у схемах стрижньового повзунно-шатунного механізму захоплювального пристрою / Р. П. Погребняк // Наука та прогрес транспорту. – 2018. – № 4 (76). – С. 81–88. doi: 10.15802/stp2018/140547
  7. Ротов, И. С. Машины для правки труб. Конструкции, расчеты, исследования / И. С. Ротов. – Москва : Изд-во Моск. гос. ун-та им. Н. Э. Баумана, 2013. – 269 с.
  8. Семененко, Ю. Л. Отделка профилей и труб давлением / Ю. Л. Семененко. – Москва : Металлургия, 1972. – 232 с.
  9. Deflection detection and curve fitting in three-roll continuous straightening process for LSAW pipes / Chunge Wang, Gaochao Yu, Wei Wang, Jun Zhao // Journal of Materials Processing Technology. – 2017. – Vol. 255. – P. 150–160. doi: 10.1016/j.jmatprotec.2017.11.060
  10. Modification of straightening machine / V. B. Sarode, D. R. Prashant, D. R. Hiraman, V. Chavan Kalyan, R. Pawar Amol // International Journal of Modern Trends in Engineering and Research. – 2017. – Vol. 4. – Iss. 4. – P.22–29. doi: 10.21884/ijmter.2017.4112.cruei
  11. Reshetov, L. Self-Aligning Mechanisms : Reference book // Transl. from Russian by L. Sachs. –Moscow: Mir, 1986. – 528 p.
  12. Zhang, Z. Q. A simplified model of maximum cross-section flattening in continuous rotary straightening process of thin-walled circular steel tubes / Z. Q. Zhang, Y. H. Yan, H. L. Yang // Journal of Materials Processing Technology. – 2016. – Vol. 238. – P. 305–314. doi: 10.1016/j.jmatprotec.2016.07.034




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