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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">10.17073/0368-0797-2015-1-35-38</article-id><article-id custom-type="elpub" pub-id-type="custom">blackmet-130</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>ИССЛЕДОВАНИЕ ТОЧНОСТИ ВНУТРЕННЕГО ДИАМЕТРА ГОРЯЧЕКАТАНЫХ ТРУБ ПРИ РАЗДАЧЕ</article-title><trans-title-group xml:lang="en"><trans-title>INVESTIGATION OF THE PRECISION OF THE INTERNAL CHANNEL OF HOT-ROLLED PIPES DURING EXPANSION</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>Богатов</surname><given-names>А. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Bogatov</surname><given-names>A. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>д.т.н., профессор, зав. кафедрой «Обработка металлов давлением»</p></bio><bio xml:lang="en"><p>Dr.Sci., Professor, Head of the Chair “Metal Forming”</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>аспирант, ассистент</p></bio><bio xml:lang="en"><p>Postgraduate, Assistant</p></bio><email xlink:type="simple">salenhall@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Уральский федеральный университет имени первого Президента России Б.Н. Ельцина</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Ural Federal University named after the ﬁ rst President of Russia  B.N. Yeltsin</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2015</year></pub-date><pub-date pub-type="epub"><day>22</day><month>03</month><year>2015</year></pub-date><volume>58</volume><issue>1</issue><fpage>35</fpage><lpage>38</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Богатов А.А., Салихянов Д.Р., 2015</copyright-statement><copyright-year>2015</copyright-year><copyright-holder xml:lang="ru">Богатов А.А., Салихянов Д.Р.</copyright-holder><copyright-holder xml:lang="en">Bogatov A.A., 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/130">https://fermet.misis.ru/jour/article/view/130</self-uri><abstract><p>В настоящее время одним из востребованных видов металлопродукции являются стальные трубы конструкционного назначения. Важнейшими их характеристиками являются точность размеров и чистота поверхности, высокий уровень механических свойств и служебных характеристик. Особое внимание уделяется точности внутреннего канала труб, так как этот параметр определяет эксплуатационную надежность и экономическую эффективность их применения. Одним из наиболее эффективных способов повышения точности является раздача трубы на оправке. Для исследования точности труб целесообразно использовать пакеты конечно-элементного моделирования. Их применение позволило исследовать внеконтактную раздачу на входе и выходе из очага деформации, неравномерность деформации и коэффициент повышения точности. Определение этих характеристик является важным условием для разработки оптимальных режимов деформации и конструкции инструмента для получения особоточных труб по внутреннему диаметру.</p></abstract><trans-abstract xml:lang="en"><p>At present, one of the highly demanded types of metal products is steel pipe for constructional purposes. The most important characteristics are its   dimensional accuracy and surface ﬁ nish, high level of mechanical properties and operating characteristics. Particular attention is paid to the precision of the internal channel of pipes, because this parameter determines the reliability and cost-effectiveness of their use. One of the most effective ways to increase the precision of the internal channel is pipe expansion by a mandrel. To investigate the accuracy of pipes a program of ﬁ nite element simulation should be used. This has allowed us to investigate the extrafocal expansion at the inlet and outlet of the deformation zone, the inhomogeneity of deformation and the increasing pipe accuracy. The evaluation of these characteristics is an important factor for developing optimal conditions of deformation and tool design high-precision pipes in order to produce in terms of their inner diameter.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>горячекатаные трубы</kwd><kwd>точность внутреннего канала труб</kwd><kwd>показатель точности</kwd><kwd>раздача труб на оправке</kwd></kwd-group><kwd-group xml:lang="en"><kwd>hot-rolled pipes</kwd><kwd>the precision of the internal channel in pipes</kwd><kwd>accuracy criterion</kwd><kwd>pipe expansion by a mandrel</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Теория обработки металлов давлением / И.Я. Тарновский, А.А. Поздеев, О.А. 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