METHOD OF secondary cooling of the slab in the continuous casting machines under steady-state and transient conditions CASTING

摘要

method u0443u043fu0440u0430u0432u043bu0435u043du0438u00a0 secondary cooling in continuous u0441u043bu00a0u0431u0430 car u043bu0438u0442u044cu00a0 blanks for stationary and transitional regimes, including pitch metal crystal u0438u0437u0430u0442u043eu0440 of intermediate bucketu0432u044bu0442u00a0u0433u0438u0432u0430u043du0438u00a0 of billets and its variable speed cooling zones by a u043eu0445u043bu0430u0434u0438u0442u0435u043bu00a0 (water or water - air mixture) on the surface of billets with the large and small radii and the definition of cost u043eu0445u043bu0430u0434u0438u0442u0435u043bu00a0, u043eu0442u043bu0438u0447u0430u044eu0449u0438u0439u0441u00a0, however, that the u043eu0445u043bu0430u0434u0438u0442u0435u043bu00a0 zones u043eu043fu0440u0435u0434u0435u043bu00a0u044eu0442 of u0432u044bu0440u0430u0436u0435u043du0438;where to see the water in the second zone u043eu0445u043bu0430u0436u0434u0435u043du0438u00a0, m3 / h;;(i = 1, 2,..., n is the number of secondary u043eu0445u043bu0430u0436u0434u0435u043du0438u00a0 u043eu043fu0440u0435u0434u0435u043bu00a0u044eu0449u0438u0439 zone;;current u0432u0440u0435u043cu00a0, counted from the beginning of casting, with.;[*] - the dependence of heat transfer coefficient on the surface of the u0441u043bu00a0u0431u0430 (w / m2) from time to time, u043au043eu0442u043eu0440u0430u00a0 u043eu043fu0440u0435u0434u0435u043bu00a0u0435u0442u0441u00a0 depending on the regime u043eu0445u043bu0430u0436u0434u0435u043du0438u00a0 u0434u043bu00a0 brand became a and by calculation with the task of u0437u0430u0442u0432u0435u0440u0434u0435u0432u0430u043du0438u00a0 with a given change in surface temperature u0441u043bu00a0u0431u0430 t = t [*];;* a = * (zi) u0432u0440u0435u043cu00a0 (c), the u043cu043du043bu0437 element u0441u043bu00a0u0431u0430, which in the current time u043du0430u0445u043eu0434u0438u0442u0441u00a0 point zi technology axis, and which u043eu043fu0440u0435u0434u0435u043bu00a0u0435u0442u0441u00a0 numerically from and u043du0442u0435u0433u0440u0430u043bu044cu043du043eu0433u043e u0443u0440u0430u0432u043du0435u043du0438u00a0:;where (') - the change of casting speed in time, m / s;;gi {} - u0444u0443u043du043au0446u0438u00a0, u043eu0431u0440u0430u0442u043du0430u00a0 to dependence (gi), where gi - the u043eu0445u043bu0430u0434u0438u0442u0435u043bu00a0 flow (m3 / u043c2u0447) in the second zone u043eu0445u043bu0430u0436u0434u0435u043du0438u00a0, coefficient of heat transfer on the surface of u0441u043bu00a0u0431u0430 in this zone, the p rich dependence (gi) (i = 1, 2,..., n) can u0440u0430u0437u043bu0438u0447u0430u0442u044cu0441u00a0 u0434u043bu00a0 separate zones;;z = z0i - zi; zi characteristic coordinates zones, m, starting from the she had a meniscus.;z0i coordinates u0441u0435u0440u0435u0434u0438u043d zones, m;;li - length zone, m;;u0432i - u043eu0445u043bu0430u0436u0434u0430u0435u043cu0430u00a0 width u0441u043bu00a0u0431u0430 in the second zone.