在大型钛环热辗扩成形过程中,驱动辊半径R1与芯辊半径R2的比值R1/R2对变形区几何形状有重要影响,而后者对于获得高质量环件起着决定性的作用。本实验首先对变形区几何形状进行了解析描述,定量确定了其与R1/R2之间的关系;其次,基于动力显式FE程序ABAQUS/Explicit,建立了可靠的大型钛环热辗扩成形过程的热力耦合3D-FE模型;最后,采用FE模拟方法,从变形区几何形状角度研究了该成形过程中R1/R2对环件成形质量的影响及机制。研究结果表明,存在R1/R2的一个优化取值范围。R1/R2在此范围内取值,能够获得端面质量良好、应变和温度分布较均匀的大型钛环。 In the large titanium ring rolling process, the ratio R1 / R2 of the driving roller radius R1 to the core roller radius R2 has an important influence on the deformation zone geometry, which plays a decisive role in obtaining a high quality ring. In this experiment, the geometry of the deformation zone was first analyzed and the relationship between R1 and R2 was quantitatively determined. Secondly, based on the dynamic explicit FE program ABAQUS / Explicit, a reliable and large titanium ring hot rolling process was established Finally, FE simulation method was used to study the influence of R1 / R2 on the forming quality of the ring and its mechanism from the perspective of deformation geometry. The results show that there is an optimal range of R1 / R2. R1 / R2 in the range of values, can get a good end face, strain and temperature distribution more uniform large titanium ring.