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| Analysis of contact contour and contact pressure in deformation zone of ultra-thin strip rolling |
| REN Zhong-kai，WANG Tao，WANG Yue-lin，FAN Wan-wan，FU Wen-shi，GUO Xiong-wei |
| （School of Mechanical Engineering， Taiyuan University of Technology， Taiyuan 030024， Shanxi， China） |
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Abstract The accuracy of the rolling force model plays a decisive role in the control of the strip thickness in the rolling process. The conventional rolling theories assumes that the roll is a circular arc. However，as the ultra-thin strip thickness decreases，the contact arc length of the deformation zone is much greater than the strip thickness，resulting in a non-circular contour. For the above problems，Fleck accurately solved the roll contour in the deformed zone based on the Hertzian contact theory，and established a new rolling force model. However，the Fleck’s analytical method is more complex，where different calculation methods have been established for different rolling conditions. To establish a simplified analysis method，not only the expression forms of rolling force and friction force in the entire deformation zone are unified，but also the elastic unloading phenomenon in the neutral zone is ignored. Then，by comparing the results calculated by simplified model with the results calculated by Fleck model and measurements，the accuracy of the simplified analytical model is verified. The influence of different factors on the contact arc profile and contact pressure distribution in the deformation zone is analyzed by the simplified model. The results show that with the decrease of the inlet strip thickness and the elastic modulus of the work roll，and the increase of the reduction，the elastic flattening of the work roll in the deformation zone becomes more and more serious.
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Received: 23 May 2018
Published: 24 December 2018
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2018, Vol. 53 
