EUROPEAN STEEL TECHNOLOGY AND APPLICATION DAYS 2017 - ESTAD 2017

Pair Cross mill(hereinafter PC mill) was developed widely to control the shape and crown of rolled strips for high productivity and saving energy. Recently, the demand for harder and thinner hot rolled strip, such as high strength steel or dual phase type high strength steel, has been increasing. In such production for harder and thinner hot rolled strip, higher reductions and larger rolling forces are required on the finishing mill stands. With the increase in rolling forces, in reduction and in rolling speed, the impact forces during the threading of the strip head end increase and mill vibrations can start to occur. The larger impact force or mill vibration causes not only the reduction of life time of the mechanical parts but also reduction of operational stability and productivity. In order to counter these effects, Mill Stabilizing Device, which consists of hydraulic cylinders equipped with damping orifices, was developed and applied for PC mill. This paper will present the PC mill equipped with Mill Stabilizing Device technology and the results of reduction of mill vibration and impact forces in an actual production line.