Calculation and Analysis of Force in Roll System of 20-High Sendzimir Mill

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% —10. 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.