Feasibility Study Of Increasing Slab Lateral Pressure In 2050 Hot Rolling

Founded and put into operation in 1989. Baosteel 2050 has a twenty-year's history of new product development to face the market competition. It has a major breakthrough in the varieties and specifications than the original design. However, it now turns hard for original lateral pressure to roll high deformation-resistance slab efficiently. Thus, increasing slab lateral pressure becomes a key issue that 2050 hot rolling needs to solve.This paper discusses the entire process of increasing slab lateral pressure. It includes preliminary necessity studies, reform plan's determination and influence on the following horizontal mill after reform. Take this as project background, it studys the influence of different die shapes on rolling force and slab shape by establishing the FEM model of SSP process. The result provides reference in SSP selection during the application of transformation process. In addition, it also has important theoretical reference value in improving the stability of pressing process and the quality of rolled slab shape. This research has main results as following:1. Slab width reduction is mainly completed by E1 edger mill. Reform necessity has been proven by frequent lateral pressure insufficiency of E1 during practical production. Adding SSP has been chosen as the best option comparing to others. Besides, products' characteristics from there different SSP manufactures have been compared.2. Based on the analysis of rolling theory, SSP structure and motion model. the FEM model of SSP process has been built by software Marc, which simulates and studys the influence of die's working face quantity and section shape on the peak of rolling force. And refering to slab shape deformation, it regresses the function between slab head width reduction, head and tail cut, dog-bone height and edging draughts respectively. Thus, the merits of three SSP die on rolling force and slab shape has been compared.3. Influence of abraded and lathed vertical roll groove on the dog-bone shape of rolled slab has been studied during actual production of edger mill. Besides, influence of the unalignment of vertical roll groove and slab on rolled slab shape has also been analyzed, which demonstrates the reason of corresponding slab deterioration.4. E1 mill's working condition has been studied when further increasing lateral pressure of edger mill. Through establishing FEM model of E1 edger mill's key components such as mill stand and screw/nut pairs, the location of probable mechanical failure under ultimate rolling load 8MN has been forecasted, and corresponding improving solution has been proposed. The result provides a theoretical reference in increasing slab lateral pressure of present equipment.5. The following R1 horizontal mill's working condition after adding SSP has been studied. Taking the slab rolled by SSP under maximum amount of lateral pressure 350mm as research object, this chapter calculates R1 mill's both maximum pressing volume under the requirements of biting condition and subsequent stable rolling condition. In addition, by establishing the comprehensive FEM model of both SSP pressing and horizontal rolling, it calculates the rolling force and then checks R1 mill's main electric motor power, result shows that it still meets the rolling requirements after adding SSP.