METHOD FOR PLUGLESS ROLLING OF TUBES IN MULTIPLE-STAND ROLLING MILL

Invention relates to the methods of non-cutting shaping of metals and may be used in multiple-stand reducing and sizing mills at plugless continuous casting of weldless and welded tubes. The method ofplugless continuous casting of tubes in multiple-stands consists in forming of a tube in two last st...

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Hauptverfasser: DRUIAN VOLODYMYR MYKHAILOVYCH, KOZLOVSKYI ALFRED IVANOVYCH, HULIAIEV YURII HENNADIIOVYCH
Format: Patent
Sprache:eng
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Zusammenfassung:Invention relates to the methods of non-cutting shaping of metals and may be used in multiple-stand reducing and sizing mills at plugless continuous casting of weldless and welded tubes. The method ofplugless continuous casting of tubes in multiple-stands consists in forming of a tube in two last stands numbered (n-1) and n according to the scheme "oval - circle" in absence of reduction along diameter in nth stand of rolling mill, at this in a pair of stands numbered (n-3) and (n-2) the forming of a tube is made according to the scheme "oval - circle" with deformation along diameter, and in the stands numbered (n-4) and (n-1) the re-elongation of tube is made without deformation along the diameter. The invention ensures the increase of precision of tubes owing to the reduction of their difference in diameters.