Development Of The New Y-type Rolling Mill And Research Of Its Controlling Characteristics

Cold-rolled strips are increasingly valued by industrialized countries due to their high dimensional accuracy and excellent mechanical properties.The production capacity and equipment level are one of the important indicators to evaluate the industrial technology development of a country.In recent years,strip production enterprises in China have made important breakthroughs in many key technical problems through the absorption and digestion from foreign advanced technologies and independent research,and both the product output and quality have made great progresses.However,cold-rolled strip production in China still faces the dilemma of low-end product overcapacity and high-end product production capacity deficiency.China's cold-rolled strip industry still needs further reform and adjustment to make the cold-rolled strip industry continue to develop healthily.From the perspective of development trends,the market demand for cold-rolled strips is more diverse and demanding,so the development and research of single-stand high-precision thin strip reversing mills should be accelerated to meet the market demand for specialized production and product flexibility.Based on the background,this research takes the roll profile electromagnetic regulation technology as the core,and combines it with different-diameter single-roller rolling technology to develop a new Y-style rolling mill,and researches its key technique problems.The main contents are as follows:A new Y-style rolling mill was designed and developed.According to the design process of the upper roll system of the rolling mill,and the force and deformation characteristics of the double-support-roll structure,the calculation model of the roll deformation was established,and the model was then verified by a finite element method.The overall structure of the new Y-style rolling mill was designed,and the key components such as rolling mill frame,roll and screwdown were also calculated and analyzed.The tension control system of the rolling mill and the rolling process monitoring system were developed to realize the collection and storage of various process parameters in the rolling process.The rolling process of new Y-style mill was modeled by using the finite element analysis software,analyzing different strip parameters and the shape of the deformation zone in the roll gap under the reduction.A different-diameter single-roller rolling experiment was carried out to verify the finite element calculation results.The finite element model was used to study the cross shear zone of the different-diameter single-roller rolling,and the influences of the initial thickness of strip,reduction and specific diameter ratio on the cross shear zone were analyzed.The minimum thickness model for the different-diameter single-roller rolling technology was proposed according to the research on the deformation zone.In addition,the influence of the drag torque of the driven roll on the deformation zone was studied,and this new rolling method was further explored.An electromagnetic-thermal-mechanical multi-field coupled finite element model was established based on the technical characteristics of the electromagnetic control roll technology on lower roller.According to the working principle of the electromagnetic control roll,the roll profile detection platform was designed and developed,and the electromagnetic control roll profile could be tested.The finite element model was verified by the experimental results.The effects of heating processes,size and position of different electromagnetic rods on the control characteristics of the roll profile were studied.According to the roll profile calculated by the electromagnetic control roll model,a theoretical analysis of the no-load roll gap of the experimental platform was conducted,and the control characteristics of the no-load roll gap of the electromagnetic control rolling test platform were studied.A three-dimensional finite element model of the new Y-style mill rolling process was established,and its roll gap characteristics under different working conditions were studied.The aluminum plate indentation experiment was carried out on the electromagnetic control rolling test platform.The variation of aluminum plate thickness distribution under different temperatures and rolling forces of electromagnetic rod were tested and analyzed.In order to further study the roll profile electromagnetic regulation technology,the aluminum strip rolling experiment was carried out,and the actual adjustment effect of the electromagnetic control roll on the shape of strip during the continuous rolling process was studied.The research provides a certain guiding significance for the design,manufacturing and development of single-stand high-precision reversing mills,and also provides technical support for the theoretical and experimental research of roll profile electromagnetic control technology in the future,laying a foundation for the application and promotion of this technology.