Method, computer program and rolling mill train for rolling a metal strip

Computer program product with a program code for being run on a microprocessor in the control device of a rolling mill train with a plurality of rolling stands,

• characterized in that
• the program code is designed for actuating the rolling stands and transporting the metal strip in accordance with the method for rolling a metal strip (200) in a rolling mill train with 1≦n≦N and N≧2 active rolling stands arranged one after the other in the rolling direction, and comprising the following steps:
• a) setting of the roll gap of the n-th rolling stand (300) to a predetermined first initial pass thickness Dk,n where k=1;
• b) transporting the metal strip with the strip head (210) upstream of the n-th rolling stand (300);
• c initial sass of the metal strip to the first initial sass thickness D in the n-th rolling stand;
• d) setting the roll gap of the n+1-th rolling stand (300) to a predetermined first initial pass thickness Dk=1,n+1, which is smaller than the first initial pass thickness Dk=1,n of the n-th active rolling stand;
• e) transporting the metal strip to the n+1-th rolling stand;
• initial sass of the metal strip to the first initial sass thickness Dk=1,n+1 of the n+1-th rolling stand;
• and
• g) building up a tensile stress in the metal strip between the n-th and the n+1-th rolling stand;
• h) reducing the initial pass thickness of the n-th rolling stand in accordance with the tensile stress between the n-th and the n+1-th rolling stands to a second predetermined initial pass thickness D2,n, which is smaller than the first initial pass thickness Dk=1,n of the n-th active rolling stand.

Rolling mill train with

• 1≦n≦N and N>2 active rolling stands (300) arranged one after the other in the rolling direction;
• a tensile stress measuring device (50) for measuring the tensile stress between two active stands arranged one after the other;
• and
• a control device for the individual setting of the roll gap of the rolling stands to a respective predetermined initial pass thickness,
• characterized in that
• the control device and the rolling mill train are designed for carrying out the method for rolling a metal strip (200) in a rolling mill train with 1≦n≦N and N≧2 active rolling stands arranged one after the other in the rolling direction, and comprising the following steps:
• a) setting of the roll gap of the n-th rolling stand (300) to a predetermined first initial pass thickness Dk,n where k=1;
• b) transporting the metal strip with the strip head (210) upstream of the n-th rolling stand (300);
• c initial sass of the metal strip to the first initial sass thickness Dk=1,n in the n-th rolling stand;
• d) setting the roll gap of the n+1-th rolling stand (300) to a predetermined first initial pass thickness Dk=1,n+1, which is smaller than the first initial pass thickness Dk=1,n of the n-th active rolling stand;
• e) transporting the metal strip to the n+1-th rolling stand;
• initial sass of the metal strip to the first initial sass thickness Dk=1,n+1 of the n+1-th rolling stand;
• and
• g) building up a tensile stress in the metal strip between the n-th and the n+1-th rolling stand;
• h) reducing the initial pass thickness of the n-th rolling stand in accordance with the tensile stress between the n-th and the n+1-th rolling stands to a second predetermined initial pass thickness D2,n, which is smaller than the first initial pass thickness Dk=1,n of the n-th active rolling stand.