Electric Motors Power Modes at Synchronization of Roughing Rolling Stands of Hot Strip Mill

The performed research is devoted to the development and testing of synchronization process for the electric motors of rough group stands of the hot strip mill (HSM) 1700 PJSC “ILYICH IRON AND STEEL WORKS OF MARIUPOL”. The load on the electric motors directly depends on the distribution of pre-rolled strip reductions, which was developed in the research as favourable schedule and is in accordance with analytical calculations and experimental studies in the HSM 1700 shop environment. Reducing peak loads on electric motors due to the redistribution of reductions and synchronization of their work allowed increasing the mass of hot rolled coils at the intermediate stage of reconstruction of HSM 1700 from 9 tons to 15.83 tons. It was determined by calculation that the maximum length of a slab with a basic thickness of 150 mm, which allows implementing the synchronization processes on the HSM 1700, is 9320 mm. It is shown that a further increasing in the slab length requires of additional synchronization of electric motors of HSM 1700 rough stands No. 2-4. The required power of the electric motors of the stands was determined after synchronization, taking into account the load while the pre-rolled strip was in two adjacent stands at the same time. It was found that the required electric motor power does not exceed the design value of 8000 kW.