CONTROL METHOD OF SECONDARY COOLING USING CONTINUOUS-CASTING MACHINE UNDER CHANGE OF INGOT DRAWING SPEED

摘要

FIELD: metallurgy.;SUBSTANCE: invention refers to ferrous metallurgy. Control of secondary cooling of an ingot using a continuous-casting machine is performed by sections of a secondary cooling zone depending on change of the drawing speed. During the transient process, the temperature of a continuously cast ingot surface is changed by the cooling rate adjustment in each section of the secondary cooling zone by relation $G\left(\tau \right)=\Delta G{\left(1-\frac{\tau }{{\tau }_{\text{trans}}}\right)}^{\frac{n}{c\tau +m}+1}+G_2,\mathop{\mathrm{image}}$ where ΔG=G₁-G₂, where G₁, G₂ are water consumption under the drawing speed ν₁ to its change and under the drawing speed ν₂ after its change as applied; τ_trans is transient process time, determined by relation τ_trans=z/ν₂, where z is a characteristic coordinate of the secondary cooling zone section; t is the current time from the moment of the speed change, s; c is a constant equal to 0.01; n and m are coefficients depending on coordinate of the secondary cooling zone section and the new steady drawing speed in the form of power polynomials, which differ for cases of the drawing speed increase and decrease.;EFFECT: improving finished products quality due to reduction of temperature tensions in the continuously cast ingot and increasing strength of the ingot cover during transient processes under change of the drawing speed.;3 dwg, 2 tbl, 1 ex