DOI: 10.18503/1995-2732-2024-22-4-89-97
Abstract
A literary review of papers describing asymmetric rolling of round blanks on smooth rolls in two and four-roll passes has been completed. The experience of using high-speed asymmetric sheet rolling has been studied and generalized. The feasibility of developing processes of sorted asymmetric rolling has been substantiated. A mathematical finite element model of flattening in the Deform-3d software has been developed. The calculation has been done for the conditions of flattening a round blank with a diameter of 12.1 mm to a size of 8.0 mm with a variable ratio of the rotational speed of the rolls from 1 to 5. Analytical studies have been completed, which have shown that as the ratio of roll speeds increases, the rolling force decreases, and the accumulated level of deformation along the section of the blank increases. A higher level of accumulated deformation is noted in the blank on the side of the roll having a higher speed. Distribution diagrams of the accumulated deformation have been built. Stress fields are given for the considered flattening options in which an increase in the proportion of shear stresses and a decrease in tensile stresses with an increase in the ratio of the rotational speeds of the rolls are observed. Experimental studies of high-speed asymmetric rolling of round samples with a diameter of 12.1 mm were carried out at the mill 400 in the A.P. Zhilyaev laboratory of mechanics of gradient nanomaterials. Hardness measurements and metal pressure on the rolls were recorded. It was shown that as the roll speed ratio increases, hardness rises and rolling force decreases. Moreover, the surface of the samples in contact with the faster rotating roll exhibits increased hardness. The results obtained were used in the development of technical specifications for the design of a four-roll stand with an individual roller drive.
Keywords
high-speed asymmetric flattening, multi-roll rolling, modeling, stress state, strain state, hardness, pressure
For citation
Kharitonov V.A., Usanov M.Yu., Lokotunina N.M., Pesin I.A., Melikhov E.D. Speed Asymmetry During Cold Rolling of Round Blanks in Cylindrical Rolls. Vestnik Magnitogorskogo Gosudarstvennogo Tekhnicheskogo Universiteta im. G.I. Nosova [Vestnik of Nosov Magnitogorsk State Technical University]. 2024, vol. 22, no. 4, pp. 89-97. https://doi.org/10.18503/1995-2732-2024-22-4-89-97
1. Gromov N.P. Teoriya obrabotki metallov davleniyem [Theory of metal processing by pressure] Moscow: Metallurgizdat, 1978, 360 p. (In Russ.)
2. Nagornov V.S. Plastic flow during low-temperature rolling of rods on a smooth barrel. Proizvodstvo prokata [Rolled products manufacturing], 2014;(1):2-11. (In Russ.)
3. Joong-Ki Hwang. Deformation behavior of longitudinal surface flaws in flat rolling of steel wire. ISIJ International. 2021;61(6):1935-1945.
4. Joong-Ki Hwang. Strain hardening rate dependency of deformation shape, strain distribution, and contact pressure during wire flat rolling. Iron and Steel Research International. 2023;30(3):475-486.
5. Polyakov M.G., Nikiforov B.A., Gun G.S. Deformatsiya metalla v mnogovalkovykh kalibrakh [Metal deformation in multi-roll calibres]. Moscow: Metallurgy, 1979, 240 p. (In Russ.)
6. Brovman M.Ya. Primeneniye teorii plastichnosti v prokatke [Application of the theory of plasticity in rolling]. Moscow: Metallurgy, 1991, 254 p. (In Russ.)
7. Pesin A.M., Salganik V.M., Kuranov K.Yu. Plyushcheniye stalnoy lenty: monografiya [Flattening of steel strip: monograph]. Magnitogorsk: MSTU, 2004, 157 p. (In Russ.)
8. Tkachenko V.A. Issledovanie processa prokatki pri upravlyaemom rassoglasovanii okruzhnyh skorostej valkov v chetyrekhvalkovom kalibre: avtoref. dis. … kand. tekhn. nauk [Research of rolling process at controlled mismatch of circumferential speeds of rolls in a four-roll caliber. Extended abstract of Ph.D dissertation]. Magnitogorsk, 1976. 24 p.
9. Steblyanko V.L., Polyakov M.G., Mamkin V.A., Tkachenko V.A. Method of regulation of profile dimensions at rolling in a four-roll calibre. Author’s certificate USSR, No. 610581. Applied: 28.02.1975. Published: 15.05.1978.
10. Steblyanko V.L., Tkachenko V.A., Mamkin V.A., Polyakov A.M. Investigation of asymmetric cases of rolling in four-roll calibres. Obrabotka metallov davleniem: mezhvuzovskij sbornik [Metalworking by pressure]. Sverdlovsk: S.M. Kirov UPI Publishing House. 1978;5:70-77. (In Russ.)
11. Pesin A.M., Tkachenko A.P., Pustovoitov D.O., Lokotunina N.M., Gorkin N.A., Biryukov M.A. Sposob asimmetrichnoj prokatki metalla [Method of asymmetric rolling of metal]. Patent RF, no. 2528601, 2014.
12. Pesin A.M., Tkachenko A.P., Pustovoitov D.O., Lokotunin N.M., Biryukov M.A., Gorkin N.A. Sposob asimmetrichnoj prokatki metalla [Method of asymmetric rolling of metal]. Patent RF, no. 2531337, 2014.
13. Konstantinov D.V., Pesin A.M., Pustovoitov D.O. Multiscale modelling of the stress-strain state at asymmetric rolling of a steel strip. Tekhnologii metallurgii, mashinostroyeniya i materialoobrabotki [Technologies of metallurgy, mechanical engineering and material processing], 2019;(18):27-32. (In Russ.)
14. Koptseva N.V., Efimova Yu.Yu., Pesin A.M., Chukin M.V. Investigation of the peculiarities of 08Y steel structure formation during asymmetric rolling at the new mill 400. Chernyye metally [Ferrous Metals], 2022;(10):39-44. (In Russ.)
15. Sverchkov A.I., Pesin A.M., Pustovoitov D.O., Telgin V.E. et al. Reduction of the number of technological cycles “rolling-annealing” of cold-rolled strip from 65G steel in the conditions of Sheet Rolling Shop 8 of Magnitogorsk Iron and Steel Works. Trudy 13 Kongressa prokatchikov [Proceedings of the 13th Congress of rolling millers], Moscow, 25-27 October, 2022. Moscow. 2023;2:126-129. (In Russ.)
16. Terentyev D.V., Usanov M.Yu., Shemetova E.S., Platov S.I., Kharitonov V.A. Assessing the stress and strain state of steel-copper wire based on modeling of drawing in a monolithic die. Vestnik Magnitogorskogo Gosudarstvennogo Tekhnicheskogo Universiteta im. G.I. Nosova [Vestnik of Nosov Magnitogorsk State Technical University], 2024;(3):170-177. (In Russ.)
17. Arkulis G.E., Dorogobid V.G. Teoriya plastichnosti [Theory of plasticity]. Moscow: Metallurgy, 1987, 352 p. (In Russ.)