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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">cvmet</journal-id><journal-title-group><journal-title xml:lang="ru">Известия вузов. Цветная металлургия</journal-title><trans-title-group xml:lang="en"><trans-title>Izvestiya. Non-Ferrous Metallurgy</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">0021-3438</issn><issn pub-type="epub">2412-8783</issn><publisher><publisher-name>НИТУ МИСИС</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.17073/0021-3438-2017-1-40-52</article-id><article-id custom-type="elpub" pub-id-type="custom">cvmet-425</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>Литейное производство</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>Foundry</subject></subj-group></article-categories><title-group><article-title>ОПРЕДЕЛЕНИЕ КОЭФФИЦИЕНТОВ ТЕПЛОПЕРЕДАЧИ И ТЕПЛООТДАЧИ ДЛЯ МОДЕЛИРОВАНИЯ ПРОЦЕССА ЛИТЬЯ АЛЮМИНИЯ В ГРАФИТОВЫЕ ФОРМЫ</article-title><trans-title-group xml:lang="en"><trans-title>DETERMINATION OF HEAT TRANSFER COEFFICIENT BETWEEN ALUMINUM CASTING AND GRAPHITE MOLD</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>Баженов</surname><given-names>В. Е.</given-names></name><name name-style="western" xml:lang="en"><surname>Bazhenov</surname><given-names>V. E.</given-names></name></name-alternatives><bio xml:lang="ru"><p>канд. техн. наук, ст. препод. кафедры литейных технологий и художественной обработки материалов (ЛТиХОМ),</p><p>119049, г. Москва, Ленинский пр-т, 4</p></bio><bio xml:lang="en"><p>Cand. Sci. (Tech.), senior lecturer, Department of foundry technologies and material art working (FT&amp;MAW),</p><p>119049, Moscow, Leninskii pr., 4</p></bio><email xlink:type="simple">V.E.Bagenov@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Колтыгин</surname><given-names>А. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Koltygin</surname><given-names>A. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>канд. техн. наук, доцент той же кафедры</p></bio><bio xml:lang="en"><p>Cand. Sci. (Tech.), assistant prof., Department of FT&amp;MAW</p></bio><email xlink:type="simple">misistlp@mail.com</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Целовальник</surname><given-names>Ю. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Tselovalnik</surname><given-names>Yu. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>студент той же кафедры</p></bio><bio xml:lang="en"><p>student, Department of FT&amp;MAW</p></bio><email xlink:type="simple">TselovalnikYuri@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Санников</surname><given-names>А. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Sannikov</surname><given-names>A. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>канд. техн. наук, нач. участка Инжинирингового центра «Литейные технологии и материалы»</p></bio><bio xml:lang="en"><p>Cand. Sci. (Tech.), section foreman, Engineering Centre «Foundry technologies and materials»</p></bio><email xlink:type="simple">sannikov.ltm@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Национальный исследовательский технологический университет «МИСиС»</institution><country>Россия</country></aff><aff xml:lang="en"><institution>National University of Science and Technology (NUST) «MISIS»</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2017</year></pub-date><pub-date pub-type="epub"><day>21</day><month>02</month><year>2017</year></pub-date><volume>0</volume><issue>1</issue><fpage>40</fpage><lpage>52</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Баженов В.Е., Колтыгин А.В., Целовальник Ю.В., Санников А.В., 2017</copyright-statement><copyright-year>2017</copyright-year><copyright-holder xml:lang="ru">Баженов В.Е., Колтыгин А.В., Целовальник Ю.В., Санников А.В.</copyright-holder><copyright-holder xml:lang="en">Bazhenov V.E., Koltygin A.V., Tselovalnik Y.V., Sannikov A.V.</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://cvmet.misis.ru/jour/article/view/425">https://cvmet.misis.ru/jour/article/view/425</self-uri><abstract><p>Для получения отливок из титановых, никелевых, медных, алюминиевых и цинковых сплавов могут использоваться формы из графита, что позволяет обеспечить высокую скорость охлаждения. При этом не нужны краски и смазки. Компьютерное моделирование процессов литья в графитовые формы требует знания теплофизических свойств заливаемого сплава и графита. Помимо этого для получения адекватных результатов моделирования необходимо определить ряд граничных условий – таких, как коэффициенты теплопередачи и теплоотдачи. Наиболее важными являются коэффициент теплопередачи между отливкой и формой, коэффициент теплопередачи между элементами формы и коэффицент теплоотдачи формы в окружающую атмосферу. В данной работе определяли коэффициент теплопередачи h (iHTC – interface Heat Transfer Coefficient) между цилиндрической отливкой из алюминия (99,99 %) и формой, выполненной из блочного графита марки ГМЗ. Форму изготавливали путем фрезерования на станке с числовым программным управлением. Нахождение коэффициента теплопередачи производилось путем минимизации значения функции ошибок, отражающей разницу между экспериментальными и полученными в процессе математического моделирования значениями температуры в форме и в отливке в процессе заливки, затвердевания и охлаждения отливки. Построены зависимости величины коэффициента теплопередачи между алюминием и графитом от температуры поверхности отливки и от времени, прошедшего с начала заливки. Установлено, что при температурах поверхности металла, контактирующего с формой, 1000, 660, 619 и 190 °С значения h равны 1100, 4700, 700 и 100 Вт/(м2 ·К) соответственно, т.е. при понижении температуры расплава от 1000 °C (температура заливки) до 660 °C (температура кристаллизации алюминия) величина h растет от 1100 до 4700 Вт/(м2 ·К), а после образования слоя твердого металла на поверхности отливки и уменьшения ее температуры – снижается. Уменьшение коэффициента теплопередачи при температурах поверхности отливки менее 660 °C, по нашему мне- нию, связано с появлением зазора между поверхностями формы и отливки вследствие линейной усадки последней. Коэффициент теплопередачи между элементами формы (графит–графит) постоянен, составляя 1000 Вт/(м2 ·К). Коэффициент теплоотдачи графита в воздушную атмосферу равен 12 Вт/(м2 ·К) при температуре поверхности формы до 600 °С.</p></abstract><trans-abstract xml:lang="en"><p>Graphite molds can be used to produce titanium, nickel, copper, aluminum and zinc castings. Using of the graphite molds provides a high cooling rate. Moreover no die coatings and lubricants are required. To get appropriate results of the casting process simulation in graphite molds it is necessary to know thermophysical properties of materials and boundary conditions such as interface heat transfer coefficients, but they are still unknown. The most important properties are heat transfer coefficient between casting and mold, and between mold parts and between mold and environment. The heat transfer coefficient h (iHTC – interface Heat Transfer Coefficient) was determined between cylindrical aluminium (99,99 % Al) casting and mold made of low-ash graphite. The mold was produced by milling graphite blocks on the CNC machine. The heat transfer coefficient was determined by minimizing the error function, representing the difference between the experimental and obtained by simulation temperature in the mold during pouring, solidification and cooling of the casting. The dependences of the iHTC between aluminium and graphite on the temperature of the casting surface and time elapsed from the start of pouring of the casting. Determined values of the heat transfer coefficient at metal temperatures 1000, 660, 619 and 190 °С are 1100, 4700, 700 and 100 W/(m2 ·К) respectively. Therefore, with decreasing of the melt temperature from 1000 °C (pouring temperature) to 660 °C (aluminium melting point), the heat transfer coefficient increases. After casting surface forming and lowering its temperature, the heat transfer coefficient decreases. Decrease of the iHTC at temperatures below 660 °C (lower the melting point) is associated primarily with the appearance of an air gap between the mold surface and casting surface as a result of linear shrinkage. The iHTC between the mold parts (graphite– graphite) is constant 1000 W/(m2 ·К). The heat transfer coefficient between graphite and the air environment is 12 W/(m2 ·К) at the mold surface temperature up to 600 °C.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>компьютерное моделирование литейных процессов</kwd><kwd>ProCast</kwd><kwd>коэффициент теплопередачи</kwd><kwd>графитовая форма</kwd><kwd>теплофизические свойства</kwd><kwd>процесс затвердевания</kwd></kwd-group><kwd-group xml:lang="en"><kwd>computer simulation of foundry processes</kwd><kwd>ProCast</kwd><kwd>interface heat transfer coefficient</kwd><kwd>iHTC</kwd><kwd>graphite mold</kwd><kwd>thermal properties</kwd><kwd>solidification</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Правительство Российской Федерации, стипендия Президента РФ молодым ученым и аспирантам, осуществляющим перспективные научные исследования и разработки по приоритетным направлениям модернизации российской экономики (конкурс 2016—2018 гг.).</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">O’Connor S. 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