Minimum Tension Control In Rolling Mill

The error of motor torque in the k th sample is as follows.

Minimum tension control in rolling mill.

Roundness is defined as the difference between maximum diameter and minimum diameter. δt k t m k t r f t 4. During production the loop and tension control automatically adjust the r factor ensuring minimum material stress between the stands. A non linear state space process model which represents the mill dynamics has been developed and a control scheme is proposed which incorporates an extended kalman filter for estimation of bar tension and optimal state feedback to provide appropriate control action.

Tension control is one of the most important process parameters in tandem cold mill tcm. Interstand tension should be maintained at acceptable levels. This parameter directly related to rolling fundamentals simplifies the setup and operator control. Tolerance is the allowable difference in maximum minimum dimensions with respect to nominal dimensions.

T m is the output torque of motor in minimum tension. The aim of the tension control in the mill is to control the stands speed and to maintain the stable and low tension conditions. F t t r t m 3 where t r is the output torque of motor in tension free rolling. Control target of minimum tension control the definition is as follows.

Looper and tension control shown in fig. Rolling force decreases with the increase of interstand tension while the tension torque increases with the increase of back tension and decreases with the increase of front tension. The problem of achieving minimum bar tension in a merchant bar rolling mill without direct tension measurement is considered. Changing roll velocity stabilizes the interstand tension.