超大型环件径轴向轧制过程偏移机理及自适应模糊控制方法研究

超大型环件径轴向轧制过程容易产生偏移，影响环件轧制稳定性和成形质量。为研究环件偏移机理及其控制方法，分析了轴向孔型滑移区中前滑区和后滑区的分布变化规律，建立了理想情况下不产生环件偏移时锥辊旋转运动学条件，获得了滑移区的最优速度匹配系数。此外，从历史轧制数据中归纳人工控制经验后提出了基于锥辊转速自适应模糊调节的环心偏移量控制方法，基于ABAQUS软件和VUAMP子程序开发，建立了集成有环心偏移量模糊控制算法的?10 m超大型环件径轴向轧制有限元模型，研究了采用最优速度匹配系数的常规控制和自适应模糊控制下的环心偏移量变化规律。结果表明，自适应模糊控制下的平均环心偏移量相比于常规控制降低了72.4%,仿真结果和试验数据均验证了所提超大型环件轧制过程偏移自适应模糊控制方法的有效性。

Study on Offset Mechanism and Adaptive Fuzzy Control Method for Radial-axial Ring Rolling Processes of Super Large Rings

During the radial-axial ring rolling processes of super large rings, the rings offset was easy to appear, which might affect the rolling stability and forming quality. To study the rolled rings offset mechanism and the control method,the law of distribution changes of the forward slip zones and the back slip zones in the axial rolls slip zones was analyzed.The rotational kinematic conditions of the axial roll without rings offset were established under ideal states and the optimal velocity matching coefficient in the slip regions was obtained. In addition, after summing up the experience of manual control from the historical ring rolling data,a control method of ring center offset was put forward based on adaptive fuzzy adjustment of axial rolls rotational speed. Based on ABAQUS software and the VUAMP subroutine, the finite element model of radial-axial ring rolling with an integrated fuzzy control algorithm for ring center offset of a 10 m super large ring was established and the variation law of the ring center offset under the conventional control and the adaptive fuzzy control with the optimal velocity matching coefficient was studied. The results show that,compared with the conventional control, the average ring center offset of the adaptive fuzzy control is reduced by 72.4%. The simulation results and experimental data verify the effectiveness of the proposed adaptive fuzzy control method for super large ring rolling processes which has rings offset.