National University of Science and Technology “MISIS” (Moscow, Russia):

V. N. Shinkin, Dr. Phys.-Math., Prof., Dept. of Physics, e-mail: shinkin-korolev@yandex.ru

During the step-by-step forming of thick steel sheet on the SMS Meer tube-forming press, the sheet is given the O-shape. The sheet forming is realized according to the three-point bending scheme (two lower fixed dies and one upper movable punch). However, at forming between a cylindrical (semicircular in a cross-section) punch and the cylindrical dies of press, there are always the poorly deformed non-contact almost straight sections of sheet (splines) with almost zero curvature. In order to reduce the splines’ size, it is necessary to make a large number of “blows” of punch (forming knife) at forming the sheet. In this case, the step of sheet forming is reduced, and the contact and non-contact zones of sheet forming overlap. The more steps at forming a sheet, the more the energy expenses and the cost of final product (finished pipe). In order to reduce the size of splines (respectively, to reduce the number of steps during forming and the cost of pipe), in this paper it is proposed to use the punch with two parallel half-cylinders. In this case, the sheet will be formed according to the four-point bending scheme, the punch mass will be reduced in several times, and the time of pipe’s forming into the O-shape will be significantly reduced.

1. Shinkin V. N. Mechanics of continuous media for metallurgists. Moscow: MISiS, 2014. 628 p.
2. Nielsen C., Martins P. A. F. Metal forming. USA: Academic Press, 2021. 428 p.
3. Davim J. P. Materials forming and machining: Research and development. USA: Elsevier Science, 2015. 185 p.
4. Hu S. J., Marciniak Z., Duncan J. L. Mechanics of sheet metal forming. USA: Butterworth Heinemann, 2002. 211 p.
5. Lenard J. G. Metal forming science and practice. USA: Elsevier Science, 2002. 378 p.
6. Shinkin V. N., Kolikov A. P. Simulation of the shaping of blanks for large-diameter pipe. Steel in Translation. 2011. Vol. 41. No. 1. pp. 61−66.
7. Zhigulev G. P., Skripalenko M. N., Fadeev V. A., Skripalenko M. M. Modeling of deformation zone during plate stock molding in three-roll plate bending machine. Metallurgist. 2020. Vol. 64. No. 3−4. pp. 348−355.
8. Fadeev V., Kondrushin A. Special aspects of determining parameters for continuous deformation of pipe billets for the specified pipes size range. Materials Today: Proceedings. 2021. Vol. 38. pp. 1322−1325.
9. Shinkin V. N. Taking into account the curvature of non-contact zone curvature of steel pipe billet at its bending on the pre-forming press with non-symmetrical rocking arm of TESA 1020 line. Chernye Metally. 2021. No. 9. pp. 41−46.
10. Goncharuk A. V., Fadeev V. A., Kadach M. V. Seamless pipes manufacturing process improvement using mandreling. Solid State Phenomena. 2021. Vol. 316. pp. 402−407.
11. Shinkin V. N. Analytical calculus of sheet curvature on four-roll mills at tubes production. CIS Iron and Steel Review. 2022. Vol. 23. pp. 50−55.
12. Belskiy S. M., Shopin I. I. Local thickenings and thinnings of hot rolled strips. Materials Science Forum. 2022. Vol. 1052. pp. 340−345.
13. Shkarin A. N., Bel’skii S. M., Pimenov V. A. Influence of the cross-sectional shape of hot semifinished rolled products on the formation of the plot of specific tension in cold-rolled strips. Metallurgist. 2020. Vol. 64. No. 7−8. pp. 699−708.
14. Muhin U., Koinov T., Belskij S., Makarov E. Application of between-stand cooling in the production of hot-rolled strips. Journal of Chemical Technology and Metallurgy. 2014. Vol. 49. No. 1. pp. 65−70.
15. Zhu X., Zhang S., Li S., Wei C. Structural Parameters Optimization of Steel Bar Straightener Based on Large and Small Deformation Theory. Journal of Shenyang Jianzhu University (Natural Science). 2022. Vol. 38. No. 3. pp. 550−558.
16. Hao J.-J., Zhu X.-Y., Cheng Z.-X. Effects of plate error on roll straightening process. Journal of Plasticity Engineering. 2022. Vol. 29. No. 4. pp. 70−74.