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<article 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" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">RUDN Journal of Engineering Research</journal-id><journal-title-group><journal-title xml:lang="en">RUDN Journal of Engineering Research</journal-title><trans-title-group xml:lang="ru"><trans-title>Вестник Российского университета дружбы народов. Серия: Инженерные исследования</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2312-8143</issn><issn publication-format="electronic">2312-8151</issn><publisher><publisher-name xml:lang="en">Peoples’ Friendship University of Russia named after Patrice Lumumba (RUDN University)</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">23424</article-id><article-id pub-id-type="doi">10.22363/2312-8143-2019-20-4-308-315</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Earth science</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Науки о земле</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Definition of acceptable parameters of defects in basic details of forging and press machines</article-title><trans-title-group xml:lang="ru"><trans-title>Определение допустимых параметров дефектов в базовых деталях кузнечно-прессовых машин</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Kornilova</surname><given-names>Anna V.</given-names></name><name xml:lang="ru"><surname>Корнилова</surname><given-names>Анна Владимировна</given-names></name></name-alternatives><bio xml:lang="en"><p>Professor of Department of Civil Engineering, Academy of Engineering of RUDN University, Doctor of Technical Science, Docent</p></bio><bio xml:lang="ru"><p>профессор департамента строительства Инженерной академии РУДН, доктор технических наук</p></bio><email>Kornilova_av@rudn.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Zaya</surname><given-names>Kyaw</given-names></name><name xml:lang="ru"><surname>Заяр</surname><given-names>Чжо</given-names></name></name-alternatives><bio xml:lang="en"><p>postgraduate of the Composite Materials Department of MSTU “STANKIN”</p></bio><bio xml:lang="ru"><p>аспирант кафедры композиционных материалов МГТУ «СТАНКИН»</p></bio><email>Kornilova_av@rudn.ru</email><xref ref-type="aff" rid="aff2"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Peoples’ Friendship University of Russia (RUDN University)</institution></aff><aff><institution xml:lang="ru">Российский университет дружбы народов</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Moscow State University of Technology “STANKIN”</institution></aff><aff><institution xml:lang="ru">Московский государственный технологический университет «СТАНКИН»</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2019-12-15" publication-format="electronic"><day>15</day><month>12</month><year>2019</year></pub-date><volume>20</volume><issue>4</issue><issue-title xml:lang="en">VOL 20, NO4 (2019)</issue-title><issue-title xml:lang="ru">ТОМ 20, №4 (2019)</issue-title><fpage>308</fpage><lpage>315</lpage><history><date date-type="received" iso-8601-date="2020-04-09"><day>09</day><month>04</month><year>2020</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2019, Kornilova A.V., Zaya K.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2019, Корнилова А.В., Заяр Ч.</copyright-statement><copyright-year>2019</copyright-year><copyright-holder xml:lang="en">Kornilova A.V., Zaya K.</copyright-holder><copyright-holder xml:lang="ru">Корнилова А.В., Заяр Ч.</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/"/><license><ali:license_ref xmlns:ali="http://www.niso.org/schemas/ali/1.0/">http://creativecommons.org/licenses/by/4.0</ali:license_ref></license></permissions><self-uri xlink:href="https://journals.rudn.ru/engineering-researches/article/view/23424">https://journals.rudn.ru/engineering-researches/article/view/23424</self-uri><abstract xml:lang="en"><p>In the Soviet Union, a unique worldwide industry was created for the serial production of forging equipment. Currently, even these machines that have served their design life are in working or maintainable condition. This has led to the fact that there is now a large market for the secondary sale of such machines, including in the countries of Southeast Asia and India. However, with the secondary sale of such equipment, some inevitable damage builds up in the basic parts. In addition, the first copies of such models, put up for secondary sale, were produced at a time when non-destructive testing methods were not developed. Some defects could be undetected. When buying a machine dismantle, transport, install and test. Cases were recorded when defects were strained during installation and testing in the base parts, which made it difficult or impossible to use such equipment. Sometimes this type of equipment (during modernization) is used to carry out technological operations that require more power than previously declared. Therefore, when buying/selling (or upgrading), it is necessary to draw up cards of permissible defects, which, when superimposed on the cards of the detected defects, will allow to reject/determine the remaining life/limit the technological strength of the crank machine so that defects during further operation are not affectted and do not lead to emergency situation. The methodology for determining the permissible parameters of subsurface elliptical cracks is shown on the example of a press bed KD2130 (BZMP).</p></abstract><trans-abstract xml:lang="ru"><p>В Советском Союзе была создана уникальная в мировом масштабе отрасль по серийному производству кузнечно-прессового оборудования. В настоящее время даже отслужившие свой проектный ресурс машины находятся в рабочем или в ремонтопригодном состоянии. Это привело к тому, что сейчас существует большой рынок вторичной продажи таких машин, в том числе в страны Юго-Восточной Азии и в Индию. Однако при вторичной продаже подобного оборудования в базовых деталях накапливается некая неизбежная повреждаемость. Кроме того, первые экземпляры моделей, выставленные на вторичную продажу, выпускались в период, когда методы неразрушающего контроля были не развиты. Часть дефектов могла оказаться необнаруженной. При покупке машины производят демонтаж, транспортировку, монтаж и испытания. Зафиксированы случаи, когда при монтаже и испытаниях в базовых деталях страгивались дефекты, что затрудняло или делало невозможным использование оборудования. Иногда на оборудовании такого типа (при модернизации) пытаются произвести технологические операции, требующие большей силы, чем ранее декларируемые. По этой причине при покупке/продаже (или модернизации) необходимо составлять карты допустимых дефектов, которые при наложении на карты обнаруженных дефектов позволят отбраковать/определить остаточный ресурс/ограничить технологическую силу кривошипной машины таким образом, чтобы дефекты при дальнейшей эксплуатации не стронулись и не привели к аварийной ситуации. Методика определения допустимых параметров подповерхностных эллиптических трещин показана на примере станины пресса КД2130 Барнаульского завода механических прессов.</p></trans-abstract><kwd-group xml:lang="en"><kwd>forging equipment</kwd><kwd>crank press</kwd><kwd>elliptical crack</kwd><kwd>allowable defect parameter</kwd><kwd>threshold value of stress intensity factor</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>кузнечно-прессовое оборудование</kwd><kwd>кривошипный пресс</kwd><kwd>эллиптическая трещина</kwd><kwd>допустимый параметр дефекта</kwd><kwd>пороговое значение коэффициента интенсивности напряжений</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><citation-alternatives><mixed-citation xml:lang="en">Sivak BA, Kornilova AV. Opredelenie obshhej dolgovechnosti i ostatochnogo resursa detalej metallurgicheskih mashin [General durability and residual service life of machine parts]. 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