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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">blackmet</journal-id><journal-title-group><journal-title xml:lang="ru">Известия высших учебных заведений. Черная Металлургия</journal-title><trans-title-group xml:lang="en"><trans-title>Izvestiya. Ferrous Metallurgy</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">0368-0797</issn><issn pub-type="epub">2410-2091</issn><publisher><publisher-name>National University of Science and Technology "MISIS"</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.17073/0368-0797-2019-3-195-200</article-id><article-id custom-type="elpub" pub-id-type="custom">blackmet-1630</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>МЕТАЛЛУРГИЧЕСКИЕ ТЕХНОЛОГИИ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>METALLURGICAL TECHNOLOGIES</subject></subj-group></article-categories><title-group><article-title>К ВОПРОСУ О ДЕФОРМАЦИИ КОЛЕЦ ВНУТРЕННИМ ДАВЛЕНИЕМ</article-title><trans-title-group xml:lang="en"><trans-title>ON RING DEFORMATION BY INTERNAL PRESSURE</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Волков</surname><given-names>В. П.</given-names></name><name name-style="western" xml:lang="en"><surname>Volkov</surname><given-names>V. P.</given-names></name></name-alternatives><bio xml:lang="ru"><p>к.т.н., ведущий инженер</p><p>620049, Россия, Екатеринбург, ул. Комсомольская, 34</p></bio><bio xml:lang="en"><p>Cand. Sci. (Eng.), Senior Engineer</p><p>Ekaterinburg</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Салихянов</surname><given-names>Д. Р.</given-names></name><name name-style="western" xml:lang="en"><surname>Salikhyanov</surname><given-names>D. R.</given-names></name></name-alternatives><bio xml:lang="ru"><p>к.т.н., научный сотрудник кафедры «Обработка металлов давлением»</p><p>620049, Екатеринбург, ул. Комсомольская, 34; 620002, Екатеринбург, ул. Мира, 19</p></bio><bio xml:lang="en"><p>Cand. Sci. (Eng.), Research Associate of the Chair “Metal Forming”</p><p>Ekaterinburg</p></bio><email xlink:type="simple">salenhall@gmail.com</email><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Институт машиноведения УрО РАН</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Institute of Engineering Science, RAS (Ural Branch)</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Институт машиноведения УрО РАН; Уральский федеральный университет имени первого Президента России Б.Н. Ельцина</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Institute of Engineering Science, RAS (Ural Branch); Ural Federal University named after the first President of Russia B.N. Yeltsin</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2019</year></pub-date><pub-date pub-type="epub"><day>19</day><month>06</month><year>2019</year></pub-date><volume>62</volume><issue>3</issue><fpage>195</fpage><lpage>200</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Волков В.П., Салихянов Д.Р., 2019</copyright-statement><copyright-year>2019</copyright-year><copyright-holder xml:lang="ru">Волков В.П., Салихянов Д.Р.</copyright-holder><copyright-holder xml:lang="en">Volkov V.P., Salikhyanov D.R.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://fermet.misis.ru/jour/article/view/1630">https://fermet.misis.ru/jour/article/view/1630</self-uri><abstract><p>Крупногабаритные кольца, изготавливаемые различными способами обработки металлов давлением, используются во многих отраслях промышленности. Для энергетической промышленности актуальным является производство бандажных колец из немагнитной аустенитной стали для укрепления лобовых частей обмоток роторов турбогенераторов большой единичной мощности. В процессе эксплуатации установки бандажное кольцо является одним из наиболее нагруженных элементов. Вследствие этого материал бандажных колец должен обладать высокими прочностными свойствами, достаточной пластичностью и хорошей магнитной проницаемостью. Деформация колец внутренним давлением является наиболее перспективным и эффективным способом их холодного упрочнения, обеспечивающим благоприятное и равномерное напряженно-деформированное состояние металла при производстве немагнитных бандажных колец мощных турбогенераторов. Поскольку к окончанию процесса холодного упрочнения готовое кольцо должно приобрести конкретные размеры и заданную степень деформации, актуальной задачей является расчет размеров исходного кольца. Существующая методика во многом опирается на опытные данные производства и применима лишь для узкого диапазона колец, что снижает точность расчета и, в конечном счете, приводит к увеличению припусков кольца и снижению коэффициента использования металла. В работе разработана и предложена новая методика расчета исходных размеров колец, в основе которой лежит условие несжимаемости. С учетом заложенных краевых условий составлена система из двух уравнений с тремя неизвестными. Для решения неполной системы уравнений предложено ввести дополнительные уравнения: в первом варианте методики использовано известное решение А. Надаи, во втором – условие постоянства относительной толщины стенки кольца, допустимое исходя из опытных данных деформирования колец разных размеров. Результаты расчета размеров исходных колец по обеим предложенным методикам были сопоставлены с опытными данными. Максимальное расхождение не превышает 4 %, а среднее значение не превышает 1 %, что указывает на достаточно высокую точность предложенных методик расчета и возможность использования их в производственной практике.</p></abstract><trans-abstract xml:lang="en"><p>Large-sized rings, manufactured by various methods of metal forming, are used in many industries. For the power industry, it is relevant to manufacture of retaining rings made of non-magnetic austenitic steel in order to strengthen the winding frontal parts of the rotors of turbine-type generators of a large unit capacity. In the process of generator operating, the retaining ring is one of the most loaded elements. As a result, material of retaining rings should have high strength properties, sufficient plasticity and good magnetic inductivity. Deformation of rings by internal pressure is the most promising and effective way of their cold hardening, providing a favorable and uniform stress-strain state of the metal in the manufacture of non-magnetic retaining rings for powerful turbine-type generators. Since the finished ring must acquire specific dimensions and a specified deformation degree in the process of cold hardening, the urgent task is calculation of the billet dimensions. The existing calculation procedure relies heavily on experimental manufacture data and is applicable only to a narrow range of rings, which reduces the accuracy of calculation and, ultimately, leads to an increase in ring allowances and a decrease in the metal utilization factor. In this research work a new technique for calculating the initial dimensions of rings, which is based on the incompressibility condition was developed and proposed. Taking into account the assumed boundary conditions, a system of two equations with three terms is compiled. To solve an incomplete equation system, it was suggested to introduce additional equations – in first version of the technique, the well-known solution of Nadai was used. In the second version – the condition of constancy of relative thickness of the ring wall permissible from the experimental data of deformation of rings of different sizes was used. The results of calculating the rings initial dimensions for both proposed techniques were compared with the experimental data. The maximum deviation from experimental data does not exceed 4 % and the deviation average value does not exceed 1 %, which indicates a sufficiently high accuracy of the proposed calculation techniques and the possibility of using them in manufacturing practice.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>бандажное кольцо</kwd><kwd>раздача колец внутренним давлением</kwd><kwd>гидрораздача</kwd><kwd>холодное упрочнение</kwd><kwd>холодная деформация</kwd><kwd>математическая модель</kwd></kwd-group><kwd-group xml:lang="en"><kwd>retaining ring</kwd><kwd>ring expansion by internal pressure</kwd><kwd>hydrostreching</kwd><kwd>cold hardening</kwd><kwd>cold deformation</kwd><kwd>mathematical model</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работа выполнена при финансовой поддержке постановления № 211 Правительства Российской Федерации, контракт № 02.A03.21.0006.</funding-statement><funding-statement xml:lang="en">The work was financially supported by the Resolution no. 211 of the Government of the Russian Federation, Contract no. 02.A03.21.0006.</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Готлиб Б.М., Вакалюк А.А. 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