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| Analytical model of mean roll radius in alloy steel bar rolling |
| LI Song-song, LI Wei, YUE Heng-quan, GAO Tian, WANG Hai-jun, YU Hui |
| College of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, Hebei, China |
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Abstract In alloy steel bar rolling, oval and round pass play a decisive role in the dimensional accuracy and quality defects of finished bar. When calculating the rolling process specification, the mean roll radius is generally used to replace the roll radius of groove profile change. Therefore, the reliability of mean roll radius calculation model plays an important role in the reasonable selection of rolling process (rolling speed, reduction, rolling force, etc.) and the improvement of geometric dimension accuracy of products. On the basis of existing mean roll radius model, considering the influence of spread for different alloy steels, the calculation formulas of section shape and rolling critical point of deformed rolled piece were deduced using the prediction model of pass rolling surface profile. A method for calculating the equivalent rectangular average height using the section area and critical average width of export rolled pieces was proposed. A new calculation model for the mean roll radius of oval and round pass was given and verified by rolling experiments. The rolling experiment results show that, compared with the existing model, the new calculation model improves the calculation accuracy of mean roll radius to a certain extent. At the same time, based on the influence coefficient of alloy composition, the corresponding relationship of critical point distribution after rolling deformation of different alloy steels is explored. Taking into account the existence of straight lines on the side walls of pass, the rolling contact state of round pass is divided into stages. When the alloy composition coefficient is small (carbon structure steel and pearlitic-martensitic steel), the rolling critical point falls on the arc groove, and all calculation models are valid. When the alloy composition coefficient exceeds 1.33 (austenitic steel and ferritic steel), the rolling critical point extends to the straight line of side wall, the original model calculation fails, and the rolling process parameters are solved by the new calculation model. The critical distribution of alloy steel grade rolling based on the new model has important guiding significance for the rapid formulation of process parameters for bar rolling steel grade transformation.
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Received: 05 January 2022
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2022, Vol. 57 
