The calculation of force for a roll system has significant effects on cold rolled thin strip gauge adjustment of a 20-high Sendzimir mill.According to the rolling parameters and rolling plans of a ZR-22BS-42 Sendzimir mill in a silicon steel factory,the contact force and the resultant force of each roll in the roll system were calculated both in the static state and in the rolling state through C++programs.It was found that the contact force between the second intermediate driven roll and the back-up rolls B and C was much lower than that between the other rolls in static state.The results also demonstrated that the resultant force are 59.5%-62%,37.7%-40.3%,87.1%-88.7% and 53.9%-56.7%of the rolling force at the second intermediate driven roll,the second intermediate idler roll,the back-up rolls B and C and the back-up rolls A and D,respectively.It was also revealed that the minimum contact force generated between the first intermediate roll and the second intermediate idler roll is 206.7 kN on the first rolling pass,and that on the second rolling pass,the minimum contact force generated between the second intermediate driven roll and the back-up roll C is 470.7 kN.
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