Фундаментальные и прикладные проблемы черной металлургии

DOI: 10.52150/2522-9117-2026-40-030

Yu. D. Uhriumov1, Ph. D. (Tech.), Senior Engineer
V. D. Dobriak1,Ph. D. (Tech.), Senior Engineer
I. A. Mazur2,*, Ph. D. (Tech.), Associate professor, ORCID 0000-0003-2177-7110
D. Yu. Uhriumov3, Technical Director

1 SE “Ukrainian institute for designing iron and steel works”
2 Ukrainian State University of Science and Technologies
3 LLC “Marine Survey Company”
* Corresponding author: i.a.mazur@ust.edu.ua

NEW PROCESSES FOR PREPARING BLANKS FOR STITCHING ON A SLANTING ROLL MILL

Abstract. The issue of improving the production of sleeves on oblique-roll piercing mills of various pipe rolling units is relevant due to their impact on the quality of the resulting pipes and the productivity of the units, as well as due to the complexity of the piercing process itself. One of the important indicators of the quality of the sleeves obtained is the accuracy of their wall thickness, which, due to the peculiarities of the process, has an increased value at the front and rear ends, which leads to an increase in the cut of the pipe ends and an increase in the metal consumption coefficient. To improve the piercing process, a number of technical solutions have been proposed for preparing blanks for piercing both by centering their ends and profiling on the cone of the front end. In this case, such preparation can be carried out both separately and practically simultaneously. Previously, the process of preparing a sleeve was considered, when the profiling of its front end is carried out by pressing into a conical matrix using a power hydraulic cylinder, and the formation of a centering hole is carried out from the side of the front end of the workpiece using another power hydraulic cylinder. To preserve the axis of the matrix and the workpiece when changing its diameter, both in connection with a change in the assortment and fluctuations in the diameter within one standard size, it is proposed to change the position of the workpiece in height and the corresponding design of the installation. G. M. Kuschinsky proposed a method and device for preparing the front ends of the workpieces before stitching on a cross-rolling mill of a pipe rolling unit 200 with a three-roll rolling mill. A feature of this technology is the planetary running-in of the front end of the workpiece and simultaneous (at one position) centering of the front end using a power hydraulic cylinder. Given the complexity of the equipment and, as a result, its low reliability, a method of preparing the front end of the workpiece sequentially at the first position with profiling of the front end by planetary running-in with a drive cage with idle rollers, followed by transverse transfer of the workpiece to the second position, where the front end is centered in a conical matrix with simultaneous centering of the rear and front ends of the workpiece, is considered. New technologies allow to increase the accuracy of pipes by reducing the final wall difference to 4÷5%, which leads to a reduction in the cut of the front ends of pipes by 1.5÷2.0 times. The proposed new technical solutions for preparing the ends of the workpieces before threading on a cross-rolling mill can be used on pipe rolling units with automatic, three-roll, rolling mill and others, which will allow to reduce the wall difference of the ends of sleeves and pipes, and reduce the metal consumption factor.

Key words: blanks, slant-roll piercing mill, sleeve, sleeve accuracy, workpiece preparation area, hydraulic cylinder, rotary table, roller table, matrix, punch, centering hole, planetary running-in of workpieces, metal consumption coefficient.

For citation: Uhriumov, Yu. D., Dobriak, V. D., Mazur, I. A., & Uhriumov, D. Yu. (2026). New processes for preparing blanks for stitching on a slant roll mill. Fundamental and applied problems of ferrous metallurgy, 40, 501-524. https://doi.org/10.52150/2522-9117-2026-40-030

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Рукопис надійшов до редакції / Received  14.11.2025
Рекомендовано до друку / Accepted 28.05.2026
Опубліковано / Published 30.05.2026

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Фундаментальные и прикладные проблемы черной металлургии
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