EXPERIMENTAL VERIFICATION OF THE MATHEMATICAL MODEL FOR ACCELERATED COOLING OF ROLLED FLAT PRODUCTS

  • Emmanuil Beygelzimer OMD-Engineering LLC, Dnipro, Ukraine
Keywords: rolled flat products, accelerated cooling, temperature, mathematical model, scale, experiment

Abstract

Purpose. Checking the adequacy of the new version of the mathematical model and its individual components by reliable temperature measurements across the thickness of the sheet during its accelerated cooling.
Methods. The data of previously performed experimental studies of temperature across the thickness of a sheet with thermocouples during its heating and quenching in a roller machine (RQM) of a sprayer type are used. Furnace temperature measurements were used to calculate the scale thickness. The measurement data after the furnace were compared with the results of calculations using the cooling model. Comparison was made for all experiments with varying heating temperature, leaf speed, water flow rate in cooling sections, and water temperature.
Results. The calculated temperature at the control points along the sheet thickness at the exit from the RQM corresponds to the temperature measured with an accuracy of ± 10 ºС. In experiments with interrupted cooling, the calculated temperature graphs repeat the characteristic changes in the course of the experimental curves. The closeness of the calculated and experimental data remains at the same level at different water temperatures. It is shown that the consistency of the model with the experiment is determined mainly by the thickness of the scale layer on the sheet surface, and the random nature of the scale removal during jet cooling can introduce significant uncertainty when modeling cooling in a wide temperature range. For this reason, it is advisable to consider the scale thickness as the main parameter for adapting the sheet temperature control process.
Originality. The data obtained confirm the scientific developments of the author included in the new version of the model, including: calculation of the speed and size of the spray jet irrigation spot taking into account the resistance of the medium, inclination and rotation of the nozzle; analytical calculation of the critical surface temperatures corresponding to the change in boiling regimes taking into account the thickness of the scale layer; assessing the thickness, speed and length of characteristic zones of water spreading over the surface of the sheet.
Practical implications. The new version of the model is recommended for use in automated control systems for industrial systems for accelerated cooling of sheet metal, including quenching.

References

Beygelzimer, E. E. (2008). Matematicheskaya model ohlazhdeniya listovogo metalla v rolikovoy zakalochnoy mashine [Mathematical model of sheet metal cooling in a roller quenching machine]. Chernaya metallurgiya. Byulleten nauchno-tehnicheskoy i ekonomicheskoy informatsii, 8, 49-54

Beygelzimer, E. E., Ostapenko, A. L., Kuzmin, A. V., Kozlenko, D. A. (2006). Kompleksnoe programmnoe obespechenie ASU kontroliruemogo ohlazhdeniya listovogo prokata [Integrated software for ACS of controlled cooling of rolled sheets]. Stal, 8, 18-23

Ivantsov, O. V., Kaskin, B. K., Vaskin, A. M., Viventsov, A. S., Zimakov, E. A. (2004). Rekonstruktsiya sistemyi laminarnogo ohlazhdeniya polosyi na nepreryivnom shirokopolosnom stane 1700 OAO "Ispat-Karmet" [Reconstruction of the laminar strip cooling system at the Ispat-Karmet’s 1700 hot strip mill]. Trudyi pyatogo kongressa prokatchikov. Cherepovets, 21-24 oktyabrya 2003 g. Moskva: MOO "Ob'edinenie prokatchikov", OAO "Chermetinformatsiya", 70-72

Ivantsov, O. V., Kaskin, B. K., Vaskin, A. M., Viventsov, A. S., Zimakov, E. A. (2005) Stabilizatsiya mehanicheskih svoystv prokata posle rekonstruktsii sistemyi laminarnogo ohlazhdeniya NShPS 1700 [Stabilization of the mechanical properties of rolled products after the reconstruction of the laminar cooling system on 1700 Hot Strip Mill]. Metallurg, 2, 42-44

Ostapenko, A. L., Kuzmin, A. V., Beygelzimer, E. E. [et al]. (2008). Programmnoe obespechenie avtomatizirovannogo rabochego mesta rolikovoy zakalochnoy mashinyi [Roller Quenching Machine Workstation Software]. Chernaya metallurgiya. Byulleten nauchno-tehnicheskoy i ekonomicheskoy informatsii, 8, 39-43

Ostapenko A. L., Beygelzimer E. E., Kuzmin A. V. [et al] (2010). Razrabotka i otsenka rezhimov rabotyi rolikovoy zakalochnoy mashinyi [Development and evaluation of the operating modes of the roller quenching machine]. Vestnik DGMA, 2(19), 212-217

Tiunov, V. N., Gritsenko, S. A., Ostapenko, A. L. [et al] (2014). Rolikovyie zakalochnyie mashinyi konstruktsii PAO NKMZ. Stal, 12, 67-71

Belobrov, Yu. N., Gritsenko, S. A., Eletskih, V. I. [et al] (2008). Sozdanie sovremennogo kompleksa termoobrabotki tolstolistovogo prokata na metallurgicheskom zavode HSW HUTA STALI, Polsha [Creation of a modern complex for heat treatment of heavy-plate products at the HSW HUTA STALI metallurgical plant, Poland]. Chernaya metallurgiya. Byulleten nauchno-tehnicheskoy i ekonomicheskoy informatsii, 8, 36-39

Ostapenko, A. L., Beygelzimer, E. E., Kozlenko, D. A. [et al.]. (2014). Issledovanie tehnologicheskih vozmozhnostey rolikovyih zakalochnyih mashin konstruktsii NKMZ [Research of technological capabilities of roller quenching machines designed by NKMZ]. Chernaya metallurgiya. Byulleten nauchno-tehnicheskoy i ekonomicheskoy informatsii, 11, 62-67

Beygelzimer, E. E. (2017). Podhod k modelirovaniyu struynogo ohlazhdeniya na osnove opornyih tochek krivoy kipeniya [Approach to the simulation of jet impingement cooling based on the reference points of boiling curve]. Metallurgicheskaya i gornorudnaya promyishlennost, 5, 85-90

Beygelzimer E. E. (2018). Vliyanie okalinyi na vid krivoy kipeniya pri struynom ohlazhdenii [Effect of scale on the shape of the boiling curve during jet-impingement cooling]. Metallurgicheskaya i gornorudnaya promyishlennost, 1, 59-62

Beygelzimer, E. E. (2012). Metodika rascheta ploschadi kontakta metalla s rolikami rolganga na listovyih stanah goryachey prokatki [Method for evaluation of the contact area between metal and roller-table rolls on hot rolling mills for flat products]. Metall i lite Ukrainyi, 8(231), 6-12

Beygelzimer E. E., Beygelzimer Ya. E. (2012). Inzhenernyiy raschet formyi spreyernoy strui dlya ohlazhdeniya metallicheskih listov [Engineering calculation of the spray pattern for cooling of metal flat products]. Izvestiya vuzov. Chernaya metallurgiya. No. 6. P. 43-47 (in Russian).

Beygelzimer, E. E., Beygelzimer, Ya. E. (2012). Raschet teoreticheskih razmerov pyatna orosheniya spreyernoy strui s uchetom naklona i povorota forsunki [Calculation of the theoretical dimensions of the spray footprint taking into account the inclination and rotation of the nozzle]. Izvestiya vuzov. Chernaya metallurgiya, 8, 32-36

Beygelzimer, E. E., Beygelzimer, Ya. E. (2013). Metodika rascheta deystvitelnyih razmerov pyatna orosheniya spreyernoy strui na gorizontalnoy listovoy poverhnosti [Method for calculating the actual size of the spray footprint on a horizontal flat surface]. Izvestiya vuzov. Chernaya metallurgiya, 2, 40-45

Beygelzimer, E. E. (2011). Inzhenernaya metodika rascheta radiusa pyatna kontakta ohlazhdayuschey strui na verhney poverhnosti goryachekatanogo lista [An engineering method for estimation of the radius of a contact-spot formed by the round liquid jet on the upper surface of hot rolled sheet]. Metall i lite Ukrainyi, 8(219), 12-19

Beygelzimer, E. E. (2011). K raschetu dlinyi zonyi intensivnogo ohlazhdeniya listovogo prokata vodyanyimi zavesami [About the calculation of the length of intensive cooling of sheet metal by water curtains]. Metall i lite Ukrainyi, 12(223), 48-54

Beygelzimer, E. E. (2012). Inzhenernaya metodika rascheta tolschinyi i skorosti sloya vodyi, rastekayuscheysya po verhney poverhnosti shirokoy polosyi pri struynom ohlazhdenii [Engineering method for evaluation of thickness and velocity of the water layer, spreading over the upper surface of the wide strip when jet cooling]. Metall i lite Ukrainyi, 11(234), 21-30

Beygelzimer, E. E. (2012). Raschetnaya otsenka dlinyi svobodnogo rastekaniya vodyi po verhney poverhnosti polosyi pri struynom ohlazhdenii [Estimation of length of the water layer, unlimitedly spreading over the upper surface of strip when jet cooling]. Metall i lite Ukrainyi, 12(235), 19-24

Ostapenko, A. L., Goncharov, N. V., Kuzmin A. V. [et al]. (2008). Eksperimentalnyie issledovaniya ohlazhdeniya listov v rolikovoy zakalochnoy mashine [Experimental investigations into cooling the sheets and plates in the rolling quenching machine]. Chernaya metallurgiya. Byulleten nauchno-tehnicheskoy i ekonomicheskoy informatsii, 8, 43-49

Ostapenko, A. L., Beygelzimer, E. E., Kozlenko, D. A. [et al]. (2016). Eksperimentalnaya otsenka ohlazhdeniya lista pri obrabotke v rolikovoy zakalochnoy mashine [Experimental evaluation of cooling process during the treatment of a plate in the roll quenching machine]. Stal, 5, 29-34

Severdenko, V. P., Makushok, E. M., Ravin, A. N. (1977). Okalina pri goryachey obrabotke metallov davleniem [Scale during hot plastic forming]. Moskva: Metallurgiya

Gubinskiy, V. I., Minaev, A. N., Goncharov, Yu. V. (1981). Umenshenie okalinoobrazovaniya pri proizvodstve prokata [Reducing of scale formation in the production of rolled products]. Kyiv: Tehnika

Peretyatko, V. N., Temlyantsev, N. V., Temlyantsev, M. V., Mihaylenko, Yu. E. (2008). Nagrev stalnyih slyabov [Heating of steel slabs]. Moskva: Teplotehnik

Sukov, G. S., Tiunov, V. N., Gritsenko, S. A. (2016). Sovershenstvovanie konstruktsii rolikovoy zakalochnoy mashinyi dlya termoobrabotki lista [Improvement of the design of the roller quenching machine for heat treatment of flat products]. Chernaya metallurgiya. Byulleten nauchno-tehnicheskoy i ekonomicheskoy informatsii, 4, 68-74

Makovskiy, V. A. (1972). Empiricheskie formulyi dlya vyirazheniya temperaturnoy zavisimosti teplofizicheskih svoystv stali [Empirical formulas for expressing the temperature dependence of the thermophysical properties of steel]. Stal, 1, 87-89

Geraschenko, O. A. (ex. ed.). (1989). Temperaturnyie izmereniya: Spravochnik [Temperature measurements: Handbook]. Kyiv: Naukova dumka

Published
2021-03-30
How to Cite
Beygelzimer, E. (2021). EXPERIMENTAL VERIFICATION OF THE MATHEMATICAL MODEL FOR ACCELERATED COOLING OF ROLLED FLAT PRODUCTS. Metallurgical and Ore Mining Industry, (1), 3-19. https://doi.org/10.34185/0543-5749.2021-1-3-19