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| Rapid prediction of rolling force of precision thin strip based on non circular arc theory |
| WANG Jiaqi1,2, LIU Xiao1,2, ZHANG Zengqiang1,2, WANG Zhenhua1,2, WANG Tao1,2 |
1. College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China;
2. Advanced Forming and Intelligent Equipment Research Institute, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China |
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Abstract Precision stainless steel ultra-thin strip is an important industrial raw material in high-end fields such as microelectronics and micro-forming, High-precision steel strips are generally rolled by multi-roll mills. The rolling force model plays a decisive role in the rolling process control of ultra-thin strip, and the accuracy of the rolling force model is mainly affected by the two parameters of deformation resistance and friction coefficient. In the rolling process, the arc length of the contact deformation zone between the extremely thin strip and the roll is generally much larger than the thickness of the rolled piece. The roll profile is flattened into a non-circular arc profile, and the traditional rolling force model based on the assumption of the arc profile is no longer applicable. In view of the above problems, based on the non circular arc theory, the rolling force model applied to 304 stainless steel strip is developed by deducing the analytical equation based on Fleck theory and computer programming. In order to optimize the rolling parameters and improve the calculation accuracy of the rolling force model, considering that the process characteristics of the ultra-thin strip rolling process are large tension rolling, the yield strength change of the rolled piece is determined by the rolling-tensile experiment and the corresponding deformation resistance model is fitted. The friction coefficient calculation program based on Fleck rolling force model is designed. Combined with the data collected in the rolling process, the friction coefficient model about the change of rolling speed is calculated and fitted in reverse. The data show that during the rolling process of the ultra-thin strip, the friction coefficient decreases with the increase of the rolling speed within a certain range. This is because as the rolling speed increases, the lubricant is more easily brought into the deformation zone, making the oil film lubrication effect in the deformation zone enhanced. The calculation and verification show that the error between the calculated value and the measured value of the model is -10%-10%, which can meet the high efficiency control requirements in the production process.
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Received: 04 May 2023
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2023, Vol. 58 
