METHOD OF DETERMINATION (FORECASTING) OF QUALITY OF CONTINUOUSLY CAST BILLET Russian patent published in 2003 - IPC

FIELD: metallurgy; particularly, production of billets in continuous casting machines. SUBSTANCE: method of forecasting quality of billet being cast in continuous casting machine containing roller apparatus incorporates steps of creation of standardized continuous casting process technology in the form of appropriate coefficients, set-up values, functional dependence, based on chemical composition and temperature of metal, sizes of billet and number of heat in series. This method also includes monitoring and recording deviations from standardized process technology, forecasting quality of cast billet depending upon quantity of deviations, their types and values. Mistakes of forecast are revealed and divided into two types, and decreased. In so doing coefficients, set-up values and functional dependence are changed in such a way, that mistake of forecast of first type becomes mistake of forecast of second type, while mistake of forecast of second type becomes mistake of forecast of first type. Proportion of mistakes prior to change and after change is determined. Then in accordance with their relationship with due consideration for character of functional dependence between actual and assumed billet defect and changed coefficients, set-up values or dependence these coefficients, set-up values or dependence are corrected based on relationship as follows: ΔX_i = M•(PB/PA)•F(x_i) where ΔX_i is value of correction of corresponding i coefficient, i set-up value or functional dependence; M is degree of influence of parameter X_i on certain type of defect; PB is proportion of mistakes prior to change of coefficients, set-up values or dependence; PA is proportion of mistakes after change of coefficients, set-up values or dependence; F(x_i) is functional which coordinates parameter X_i and its influence on certain type of defect. EFFECT: reduced power consumption and labor input; increased production output; reduced manufacturing cost of continuously cast billets. 2 cl, 4 dwg