Flying shear system with adaptive cut-length control and the operational method thereof

A method for cutting a plurality of blooms into a desired number of product billets with predetermined optimum head and tail scrap lengths, comprising steps of:

• successively feeding blooms of known weight;
• successively heating said blooms in a furnace means;
• successively rolling said blooms in a first rolling means after heating so as to product finish rolled billets having reduced cross-sections;
• successively rolling said finish rolled billets in a second rolling means;
• measuring a total length of each of said finish rolled billets downstream of said second rolling means;
• calculating a CLSI value for each of said finish rolled billets, which CLSI value is indicative of a uniform length of each of the product billets that can be cut from each of said finish rolled billets while maintaining predetermined optimum head and tail scrap length, said CLSI value of each of said finish rolled billets being a function of a cross-section of an immediately preceding one of said finish rolled billets, said cross-section of the immediately preceding one of said finish rolled billets being calculated as a function of total length, weight and density of said immediately preceding finish rolled billet;
• adjusting a gap setting of said second roller means so as to correct a cross-section of said finish rolled billets when said CLSI value is not within a safety billet length range so as to produce finish rolled billets having a new CLSI value that falls within said safety billet length range;
• and
• controlling a flying shear means to cut said finish rolled billets into said desired number of product billets.