@ARTICLE{Salikhyanov_D._The_2018, author={Salikhyanov, D. and Bogatov, A. and Dyja, H.}, volume={vol. 63}, number={No 2}, journal={Archives of Metallurgy and Materials}, howpublished={online}, year={2018}, publisher={Institute of Metallurgy and Materials Science of Polish Academy of Sciences}, publisher={Committee of Materials Engineering and Metallurgy of Polish Academy of Sciences}, abstract={This research work is devoted to the theoretical study of the pipe calibration on a mandrel. The aim of the study is to improve the precision of the calibrated pipes. As the paper shows, it is advisable to apply different methods of research depending on the purpose of the study of metal forming processes: mathematical, computer or physical simulation. Analytical review of existing mathematical models of the pipes calibration on a mandrel showed that the set of assumptions adopted in the mathematical modeling does not allow assessing the precision of the pipes during calibration. Therefore, finite-element method simulation package was used for this research. Research method and pipes precision index were developed on the basis of the computer simulation using Deform-3D package. The investigations have allowed us to get the dependence of the pipe precision on technological factors and to identify the root cause of reduced efficiency calibration – extrafocal deformation.}, type={Artykuły / Articles}, title={The Choice of Initial Conditions and of Solution in the Problem of Efficiency Increase of Pipes Calibration on a Mandrel}, URL={http://www.journals.pan.pl/Content/106680/PDF/AMM-2018-2-26-Dyja.pdf}, doi={10.24425/122399}, keywords={hot-rolled pipe, pipe calibration on a mandrel, pipe precision index, extrafocal deformation, finite element simulation FEM}, }