Calculation model of asynchronous rolling pressure during flattening process
The phenomenon of asynchronous rolling,where the friction coefficients between the upper and lower sur-faces of the strip differ due to the uneven distribution of leveling fluid droplets on the lower surface of the strip dur-ing the temper rolling process,leads to limited accuracy when predicting the rolling pressure using conventional en-gineering-level leveling models.To address the issue of significant errors in calculating the rolling pressure for asyn-chronous rolling using these models,a calculation method suitable for asynchronous rolling is proposed.This study takes into account the process characteristics of asynchronous rolling and the actual operating conditions of the e-quipment.Firstly,the differences in lubrication conditions and force deformation between the upper and lower sur-faces of the strip are analyzed,and equilibrium equations for the deformation zone and the equation for calculating the unit rolling pressure are established.Secondly,the differences in flattening between asynchronous and synchro-nous rolling are investigated.Based on the geometric relationships of deformation and the theory of elastoplastic me-chanics during the rolling process between the upper and lower rolls,the calculation methods for various parameters in the deformation zone are determined.An iterative method is then employed to improve the accuracy of the calcula-tion model.A rolling pressure calculation model suitable for the asynchronous rolling process in leveling units is es-tablished,along with a method for back-calculating the friction coefficient between the upper and lower surfaces of the strip.Finally,to validate the accuracy of the model,equipment parameters from a domestic leveling unit and typical process parameters for strip production are used.The theoretical values obtained from the rolling pressure model under different lubrication conditions are compared with calculating the rolling pressure for rolling using engi-neering model and the on-site measured data.The results demonstrate that the proposed asynchronous rolling pres-sure model can applicable to asynchronous rolling,it reduces the error by 5％compared to the engineering model during the temper rolling process and provides valuable insights.
wet levelingasynchronous rollingrolling pressuremathematical modelback calculation of friction coefficient
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