Analysis of vertical shaking mechanism of aluminum plate cold rolling mill based on dynamic friction equation of roll gap

[CHINA ALUMINIUM NETWORK] Cold-rolling mill, a multi-mass, rotating moving body system, often causes rolling mill vibration during its high-speed, transient rolling process. When the parameters of the rolling process, equipment, and control are well matched, this vibration phenomenon is not clearly reflected. However, once the rolling mill operation status exceeds the precision requirement of the product or the equipment's bearing capacity, it will cause frequent vibration of the rolling mill. In the vibration forms of the torsional vibration, vertical vibration and vertical-torsional coupled vibration of the transmission system, which often occur in the cold rolling of strip steel, the frequency of the triple frequency vibration of the vertical system is more harmful, and it is likely to affect the rolling product. The plate thickness-plate quality index has an adverse effect, while it can cause damage to the rolling mill equipment. The scholars of University of Science and Technology of Beijing aim at the phenomenon of vertical vibration of cold rolling mills frequently occurring during the high speed aluminum sheet rolling process. Combined with the rolling process lubrication theory and mechanical vibration theory, the vertical vibration model of rolling mill based on the dynamic friction equation of roll gap is established. The model consists of a roll gap geometry model, a dynamic friction model of the roll-rolling work interface, a forward rolling stress in the deformation area, a friction stress distribution model, and a two-degree-of-freedom vertical system structural model for a single-stand aluminum cold mill. composition. At the same time, in order to study the vertical vibration mechanism and system stability of the cold rolling mill under the influence of the dynamic friction mechanism of the roll-rolling work interface, a single-stand aluminum rolling mill equipment and process parameters were used to build a Matlab/Simulink platform and simulation simulation rolling respectively. The pressure and forward rolling stress curves were validated to verify the effectiveness of the model. The relationship between the mixed friction state in the deformation zone, the roll-rolling surface roughness, the thickness of the rolling insert and the stability of the system was discussed.