锻压技术

大型铝合金C形截面环轧制过程数值模拟和轧制区成形规律分析

英文标题：Numerical simulation on rolling process and analysis on rolling zone forming law for large aluminum alloy C-shaped cross-section ring

作者：于华民董方吴运新龚海刘磊阳代军

单位：中南大学首都航天机械有限公司

关键词：2219铝合金辊系运动控制等效应变金属流动填充深度

分类号：TG335

出版年,卷(期):页码：2021,46(11):197-206

摘要：

以目标外径为Ф2500 mm的C形截面铝合金环件为研究对象，采用Abaqus有限元软件对环件轧制过程进行数值模拟。对2219铝合金材料试样进行热压缩实验，得到不同的应变速率（0.01~10 s-1）以及温度(350~500 ℃)条件下材料的真应力-真应变曲线，将其作为模拟实验的材料属性。通过数学建模建立辊系运动控制策略，并以环件外径稳定长大为条件计算了芯辊的进给速度；针对实际轧制过程中出现的前滑现象，修正了锥辊的实时转速；运用Fortran语言对子程序进行二次开发，以控制仿真过程中辊系的运动；在提交运算时调用子程序，由此建立了C形截面环件轧制过程的有限元模型，分析并得出了环件轧制区内部温度场和应力场呈轴向对称分布的特点，以及轴向中部金属横向流动速度较快及环件在第8道次时完全充型等成形规律。

For the aluminum alloy C-shaped cross-section ring with an outer diameter of Ф2500 mm, the rolling process of ring was simulated numerically by finite element software Abaqus. Then, the sample of 2219 aluminum alloy material was subjected to a hot compression experiment, and the true stress-true strain curve of the material at different strain rates (0.01~10 s-1) and temperatures (350~500 ℃) were obtained, which was used as material properties in the simulation experiment. Furthermore, the roller system motion control strategy was established by mathematical modeling, and the feeding speed of core roller was calculated in the condition that the outer diameter of ring grew steadily. In view of the forward slip phenomenon in the actual rolling process, the real-time rotational speed of tapered roller was modified, and the secondary development of subroutine was conducted by language Fortran to control the movement of the roller system in the simulation process. When submitting the calculation, the subroutine was called, and thereby the finite element model of the rolling process for C-shaped cross-section ring was established. Finally, through analysis, it is concluded that the temperature field and stress field in the rolling zone of ring shows axially symmetrical distribution characteristics, the metal lateral flow speed in the middle of the axial direction is faster, and the ring is completely filled in the eighth pass.

基金项目：

国家自然科学基金航天联合基金项目（U1637601）

作者简介：于华民（1995-），男，硕士研究生，E-mail：huamin_yu1008@163.com；通信作者：吴运新（1963-），男，博士，教授，博士生导师，E-mail：wuyunxin@csu.edu.cn

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