Estimation of depth and degree of mill roll surface hardening during grit texturing
https://doi.org/10.17073/0368-0797-2020-9-735-741
Abstract
The paper presents shot blasting (SB) as the most common method of arrangement of temper mills rolls surface microgeometry, providing required roughness of the cold-rolled strip. The surface riffing studies were carried out at the Willibrator industrial unit; metallographic studies were performed using MEIJI 2700 optical microscope and JSM-6490LV scanning electron microscope. Refinement of the surface layer structure during interaction of the roll material with the grit was revealed. In the work the lower bound method, one of the methods of plasticity theory, is used for theoretical analysis of the SB process. To make computations easier, the roll microcave is approximated to spherical shape. Quantitative estimates of deformation degree and the depth of hardened layer were determined by speed of the grit and hardness of the roll surface. The depth of hardened layer is obtained by the size of used grit, and to a lesser extent, by the speed of grit impact on the roll surface and textured surface hardness. It has been searched out in literature that increase in hardness by one unit leads in average to 3 % increase in resistance. Thus, SB application allows reduction of time of rolls rehandling of temper mills by 6.0 – 10.5 %, depending on application modes of rolls riffing with grit. Analysis of microstructure have shown that increase in hardness of the surface layer is a consequence of refinement of its structure in process of interaction with the grit. It has been revealed that increase in hardness of the surface layer leads to an increase in its wear resistance and fatigue strength. The authors of the work have found that at speed of 60 m/s the hardness increases by 3.5 units.
About the Authors
E. Yu. Zvyagina
G.I. Nosov Magnitogorsk State Technical University
Russian Federation
Russian Federation
Cand. Sci. (Eng), Assist. Professor of the Chair “Machinery and Metal Forming Technology and Mechanical Engineering”
Magnitogorsk
N. N. Ogarkov
G.I. Nosov Magnitogorsk State Technical University
Russian Federation
Russian Federation
Dr. Sci. (Eng), Professor of the Chair “Machinery and Metal Forming Technology and Mechanical Engineering”
Magnitogorsk
M. A. Polyakova
G.I. Nosov Magnitogorsk State Technical University
Russian Federation
Russian Federation
Dr. Sci. (Eng), Professor of the Chair “Materials Processing Technologies”
Magnitogorsk
M. D. Sukhova
G.I. Nosov Magnitogorsk State Technical University
Russian Federation
Russian Federation
MA Student of the Chair “Machinery and Metal Forming Technology and Mechanical Engineering”
Magnitogorsk
References
1. Bel’skii S.M., Mazur S.I., Mukhin Y.A., Goncharov A.I. Influence of the cross section of hot – rolled steel on the flatness of cold-rolled strip. Steel in Translation. 2013, vol. 43, no. 5, pp. 313–316.
2. Ogarkov N.N., Zvyagina E.Yu., Ismagilov R.R. Theoretical analysis of formation of automobile sheet roughness during temper rolling in shot-blasted rolls. Izvestiya. Ferrous Metallurgy. 2019, vol. 62, no. 8, pp. 600–605. (In Russ.).
3. Ogarkov N.N., Zaletov Yu.D., Las’kov S.A., Zvyagina E.Yu., Pozhidaev Yu.A. Improvement of shot blasting for rolling mill production. Vestnik Magnitogorskogo Gosudarstvennogo tekhnicheskogo universiteta im. G.I. Nosova. 2010, no. 2 (30), pp. 41–43. (In Russ.).
4. Rasp W., Wichern C.M. Effects of surface-topography directionality and lubrication condition on frictional behavior during plastic deformation. Journal of Material Processing Technology. 2002, vol. 125, Special Issue, pp. 379–386. (In Russ.).
5. Lebedenko V.G. Mathematical modeling of formation of surface layer geometric and hardening parameters at parts grit processing. Vestnik Donskogo gosudarstvennogo tekhnicheskogo universiteta. 2008, vol. 8, no. 4 (39), pp. 202–212. (In Russ.).
6. Stone M.D. Rolling of Thin Strip. Part 1. In: Iron and Steel Engineer Year Book. 1953, pp. 115–128.
7. Zyk E.N. Assessment of possibility of increasing fatigue strength level of machine parts during operation by impact SPD methods. Sovremennye naukoemkie tekhnologii. 2016, no. 11-1, pp. 36–40. (In Russ.).
8. Tamarkin M.A., Tishchenko E.E., Lebedenko V.G. Surface-layer quality in shot treatment. Russian Engineering Research. 2010, vol. 30, no. 2, pp. 144–148.
9. Dudkina N.G., Abramenko S.A., Barinov V.V. Determination of thickness of hardened surface layer of steel parts subjected to shot blasting. Uprochnyayushchie tekhnologii i pokrytiya. 2018, vol. 14, no. 12 (168), pp. 547–549. (In Russ.).
10. Utsch M., Vinke P. Roll Texturing technology as a base of modern surfaces in automotive cold mill flat products. In: MS&T: Conference Proceeding. 2004, pp. 599–607.
11. Johnson W., Mellor P.B. Engineering plasticity. London, New York: Van Nostrand Reinhold Co., 1973, 646 p. (Russ. ed.: Johnson W., Mellor P.B. Teoriya plastichnosti dlya inzhenerov. Ovchinnikov A.G. ed. Moscow: Mashinostroenie, 1979, 567 p.).
12. Shkatov V.V., Pogodaev A.K., Romanenko D.N., Mazur I.P. The influence of nanoscale precipitation of aluminum nitride on the formation of recrystallization texture in aluminum deoxidized low-carbon steels. Journal of Chemical Technology and Metallurgy. 2017, vol. 52, no. 4, pp. 617–620.
13. Ogarkov N.N., Platov S.I., Zvyagina E.Yu., Molochkova O.S., Makarova I.V. Choosing the materials performance and the form of an indenter for arrangement of texture at the surface of skin mill rolls. In: IOP Conference Series: Materials Science and Engineering. 2019, article 012195.
14. Shmyrin А.М., Mazur I.P., Kavygin V.V., Yartsev А.G. Parametrical neighborhood modelling of the process of forming the temperature of hot-rolled strip coiling. Journal of Chemical Technology and Metallurgy. 2016, vol. 51, no. 4, pp. 401–404.
15. Roberts W.L. An Approximate Theory of Temper Rolling. In: Iron and Steel Engineer Year Book. 1972, pp. 530–542.
16. Konovalov Yu.V. Spravochnik prokatchika. Kniga 2. Proizvodstvo kholodnokatanykh listov i polos [Rollerman’s Handbook. Book 2. Production of Cold Rolled Sheets and Strips]. Moscow: Teplotekhnik, 2008, 608 p. (In Russ.).
17. Efremov D.B., Gerasimova A.A., Gorbatyuk S.M., Chichenev N.A. Study of kinematics of elastic-plastic deformation for hollow steel shapes used in energy absorption devices. CIS Iron and Steel Review. 2019, vol. 18, pp. 30–34.
18. Polukhin V.P., Nikolaev V.A., Tylkin M.A. etc. Nadezhnost’ i dolgovechnost’ valkov kholodnoi prokatki [Reliability and Durability of Rolls for Cold Rolling]. Moscow: Metallurgiya, 1976, 448 p. (In Russ.).
19. Оgarkov N.N., Рlatov S.I., Zvyagina E.Yu. Modeling of roll roughness transfer process to strip during skin-pass rolling. Lecture Notes in Mechanical Engineering. 2019, vol. 2, pp. 1–7.
20. Otenii Ya.N., Privalov N.I., Shchegolev N.G., Murav’ev O.P., Tkacheva Yu.O. Features of formation of hardening depth at parts processing by surface plastic deformation Mezhdunarodnyi zhurnal prikladnykh i fundamental’nykh issledovanii. 2016, no. 12-3, pp. 452–455. (In Russ.).
Review
For citations:
Zvyagina E.Yu., Ogarkov N.N., Polyakova M.A., Sukhova M.D. Estimation of depth and degree of mill roll surface hardening during grit texturing. Izvestiya. Ferrous Metallurgy. 2020;63(9):735-741. (In Russ.) https://doi.org/10.17073/0368-0797-2020-9-735-741
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