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

N. L. Lisunets,  lisunets@yandex.ru

A.G. Radyuk

”Severstal TPZ-Sheksna” LLC (Cherepovets, Russia):

 A. V. Kolobov

 E. S. Fedotov

Cherepovets State University – Federal State Budgetary Educational Institution of Higher Professional Education (FSBEI HPO) (Cherepovets, Russia):

A.I. Vinogradov

At present time, multi-disk shears mounted in the coil slitting lines (CSL) are used for slitting of coiled steel in manufacture of electric welded tubes of small and medium diameter from tube strip billet. In the conditions of wide strip dimension and steel grade range production, transition from one tube strip size to another with varying of steel grades and its mechanical properties is connected with additional adjusting of technological process parameters for providing the required quality. It is possible to manage the process on the base of the developed generalized model that is built on the results of statistical processing of the passive production experiment and allows to adjust parameters of equipment. Mathematical models of the process of slitting of coiled strip at the coil slitting lines using “Statistika” program have been built based on the results of processing of experimental data as regression equations for the following controlled parameters: gap between shears, overlapping of shears, strip speed, specific tension at uncoiler; it allows to improve line adjusting for fabrication of billets with other dimensions. Recommendations for minimizing of trapezium value and cutting angle are given; they can be used in slitting of coiled strip at the coil slitting lines. These recommendations have been tested in slitting of coiled steel to tube strip billets of 10ХСНД (10KhSND) steel for Tikhvinsky freight car building plant and can be used as generalized model of the process of slitting of coiled steel at multi-disk shears during different production and adjusting stages at coil slitting lines.

1. Mashiny i agregaty metallurgicheskikh zavodov (Machines and units of metallurgical works) in 3 volumes. Vol. 3. Tselikov A. I., Polukhin P. I., Grebenik V. M. et al. Mashiny i agregaty dlya proizvodstva i otdelki prokata (Machines and units for manufacturing and finishing of rolled products). Manual for high schools. Moscow. Metallurgiya. 1981. 576 p.

2. Babkin A. G., Lozovoy V. N., Zagumennov O. V. Osobennosti prodol’noy rezki rulonnogo prokata bz stali 08ps pri proizvodstve shtripsa dlya svarnykh vodogazoprovodnykh trub (Features of slitting of coiled rolled products of 08ps steel in tube strip manufacturing for welded water and gas pipeline tubes). Metallurg – Metallurgist. 2007. No. 9. P. 37-38.

3. Borovkov A. A. Matematicheskaya statistika (Mathematical statistics). Novosibirsk. 1997. 772 p.

4. Pugachev V. S. Teoriya veroyatnostey i matematicheskaya statistika (Theory of probabilities and mathematical statistics). Moscow. Nauka. 1979. 496 p.

5. Borovikov V. P., Borovikov I. P. STATISTICA. Statisticheskiy analiz i obrabotka dannykh v srede Windows (Statistical analysis and data processing in Windows medium). Moscow. “Filin” Information and publishing house. 1997. 608 p.

6. Raskatov E. Yu. Issledovanie protsessa i razrabotka sposoba rezki tonkikh polos iz transformatornykh staley (Study of the process and development of the method of slitting for thin strips of transformer steels). The thesis of Dr. Eng. Ekaterinburg. 2002. P. 29.

7. Shestakov V. V., Kolobov A. V., Seleznev M. S. et al. Razrabotka statistichesloy modeli razrezki rulonnoy stali na APR v usloviyakh OOO “Severstal TPZ – Sheksna” (Development of statistical model for slitting of coiled steel at the coil slitting line of “Severstal TPZ – Sheksna”. Izvestiya VUZov. Chernaya Metallurgiya – News Bulletin of High Schools. Ferrous Metallurgy. 2011. No. 9. P. 39-41.

8. Kolobov A. V., Fedotov E. S., Lisunets N. L. et al. Puti minimizatsiii trapetsiii i ugla reza pri razrezke rulonnoy stali na APR v usloviyakh OOO “Severstal TPZ – Sheksna” (Ways of minimization of cutting trapezium and cutting angle in slitting of coiled steel at the coil slitting line of “Severstal TPZ – Sheksna”. Izvestiya VUZov. Chernaya Metallurgiya – News Bulletin of High Schools. Ferrous Metallurgy. 2012. No. 1. P. 17-19.