Abstract
Dynamic characteristic analysis of a two-stand reversible cold rolling mill in the startup process was carried out. The delay algorithm of the interstand thickness was proposed. A new method combined with the accelerated secant and the tangent methods was established to solve the simultaneous equations. The thickness and interstand tension transition processes with different static tension establishing processes were analyzed. Both mills were operated under constant rolling force control mode in the above process. The results show that the strip thickness in the rolling gap reduces in the static mill screwdown process. The entry stand runs inversely to establish the static interstand tension. This area becomes an abnormal thickness reduction area of the incoming strip. It results in several abnormal interstand tension increases in the subsequent startup process. The tension increase leads to an impact force on the strip that is the main reason of the strip breakage in the startup process. So the static tension establishing process was optimized, and the interstand tension fluctuation and the strip breakage accidents both reduced significantly. The results are beneficial to the startup process of the two-stand reversible cold rolling mill.
Highlights
Two-stand reversible cold rolling mills, a typical layout of which is shown in Figure 1, are called compact cold mill (CCM)
The thickness control and tension establishing process of a five-stand tandem cold rolling mill (TCM) were analyzed using a linearization physical model based on dynamic tension differential equations and the thickness delay method by PHILLIPS [1]
Application and Discussions of New. It can be obtained from the above analyses that the thickness transition area is the main reason that causes the sharp interstand tension increases, and the sharp interstand tension increases result in the strip breakage in the startup stage
Summary
Two-stand reversible cold rolling mills, a typical layout of which is shown in Figure 1, are called compact cold mill (CCM). The thickness control and tension establishing process of a five-stand tandem cold rolling mill (TCM) were analyzed using a linearization physical model based on dynamic tension differential equations and the thickness delay method by PHILLIPS [1]. It is the origin of computer simulation of continuous rolling processes. The transient characteristics of threading, acceleration, deceleration, and tail-out processes with and without AGC [12] were analyzed using the nonlinear method This method was extended to strip crown control and rolling force analysis with a twodimensional dynamic metal model [13]. The running status of the new startup strategy was discussed
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
