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

S. V. Samusev, Dr. Eng., Prof., Metal Forming Dept.
V. A. Fadeev, Graduate Student, e-mail: fdv_viktor@mail.ru

A technique for calculating the parameters of the shape of the boundary and areas of contact indentations of a pipe billet with a roller tool of a forming mill, in which the boundaries of the shape of the contact indentation are described by rectilinear lines, and the shape is modeled by triangles on the plane of the pipe billet, is investigated. The results of an experiment on fixing the contact sections of a tubular billet with initial dimensions of 160×1.5×1800 mm from steel 09G2S with rolls in the section of open pass are presented. As a result of the experiment, the contact areas of the pipe billet with the lower and upper rolls were fixed. The boundary of the experimental contact areas are curved arcs. Comparison of the experimental data with the technique showed that the parameters of the boundaries of the contact area according to the technique lead to an overestimation of the values by 30-40 % compared to the experimental data. On the basis of experimental data, the development of the existing technique for determining contact areas is presented, in which the boundaries are defined in the form of arcuate curves. The boundaries of the entry contact sections for the lower and upper rolls are determined by the equations of exponential approximation. Taking into account the equations of the boundaries of the sections, a method is presented for determining the areas of contact sections of a pipe billet on the surfaces of the lower and upper rolls, the results of which do not exceed 6 % of the experimental data. The engineering mathematical software PTC Mathcad Prime 6.0 was used to calculate and construct the areas of contact areas.

1. Kolikov A. P., Taupek I. M. Simulation of Continuous Roll Forming Process for Producing Welded Pipes of Small and Medium Diameters. Metallurgist. 2018. Vol. 61. No. 9-10. pp. 839–843.
2. Kolikov A. P., Lelyotko А. S., Matveev D. B., Kulyutin S. А., Kadilnikov S. V. Study of residual stresses in welded pipes. Izvestiya vysshikh uchebnykh zavedeniy. Chernaya metallurgiya. 2014. Vol. 57. No. 11. pp. 48–53. DOI: 10.17073/0368-0797-2014-11-48-53
3. Budnikov А. S., Romantsev B. А., Kharitonov Е. А. Determination of diameter of rolls of screw rolling mills. Izvestiya vysshikh uchebnykh zavedeniy. Chernaya metallurgiya. 2018. Vol. 61. No. 9. pp. 683–688. DOI: 10.17073/0368-0797-2019-9-683-688
4. Garber E. A., Shadrunova I. A., Traino A. I., Yusupov V. S. Analysis of a deformation zone and the refined calculation of the forces for cold rolling of strips thinner than 0.5 mm in a continuous mill. Russian Metallurgy (Metally). 2002. Vol. 2002, Iss. 4. pp. 340–345.
5. Romantsev B. A., Gamin Yu. V., Goncharuk A. V., Aleshchenko A. S. Innovative Equipment for Producing Cost-Effective Hollow Billets for Mechanical-Engineering Parts of Small Diameter. Metallurgist. 2017. Vol. 61, Iss. 3-4. pp. 217–222.
6. Nguyen D. C., Efremov D. B. The method for determining the profile of large diameter pipes and the optimal technological mode during calibration-bending in the weld zone. 2020 IOP Conf. Ser.: Mater. Sci. Eng. 862 032104.
7. Aleshchenko А. S., Budnikov А. S., Kharitonov Е. А. Study of metal deformation in process of pipe reduction on a three-roll mill. Izvestiya vysshikh uchebnykh zavedeniy. Chernaya metallurgiya. 2019. Vol. 62. No. 10. pp. 756–762. DOI: 10.17073/0368-0797-2019-10-756-762
8. Romantsev B. A., Gamin Yu. V., Goncharuk A. V. et al. Innovative Equipment for Producing Cost-Effective Hollow Billets for Mechanical-Engineering Parts of Small Diameter. Metallurgist. 2017. Vol. 61. pp. 217–222. DOI: 10.1007/s11015-017-0480-2
9. Bannikov A. I., Alekseychuk V. I., Makarova, O. A., Dyatlov N. A. The quality of a surface received by processing the end of a large diameter pipe with the use of a single-row cylindrical brush. Materials science forum. 2019. Vol. 973. pp. 75–79. DOI: 10.4028/www.scientific.net/msf.973.75
10. Shinkin V. N. Failure of large-diameter steel pipe with rolling scabs. Steel in Translation. 2017. Vol. 47, No. 6. pp. 363–368.
11. Kolikov А. P., Romanenko V. P., Samusev S. V. et. al. Pipe production machines and units; tutorial for universities. Moscow: MISiS, 1998. 536 p.
12. Samusev S. V., Fadeev V. А. Study of the contact interaction of a strip with work rolls during of continuous scelping of welded pipes in a TESA line. Chernye Metally. 2020. No. 2. pp. 41–46.
13. Park Y., Lee C., Kim J., Kim D., Ahn H. et al. Parametric analysis for minimizing the edge waves in the roll forming. International Journal of Automotive and Mechanical Engineering. 2018. Vol. 15. No 3. pp. 5480–5499.
14. Cheng J., Cao J., Zhao J., Liu J., Zhao R., Liu S. The flower pattern and rolls design for ERW pipes with the different specification in the flexible roll forming process. Thin-Walled Structures. 2020. Vol. 154. 106809. DOI: 10.1016/j.tws.2020.106809
15. Gujre V. S., Anand R. Machine learning algorithms for failure prediction and yield improvement during electric resistance welded tube manufacturing. Journal of Experimental and Theoretical Artificial Intelligence. 2020. Vol. 32, Iss. 4. pp. 601–622.
16. Rymov V. А., Polukhin P. I., Potapov I. N. Improvement of welded pipes production. Мoscow: Metallurgiya, 1983. 286 p.