大型锥形环件成型制造新工艺及其数值模拟

New Techniques for Prototype Manufacturing of Great Conical Ring and Its Numerical Simulation

针对600MW蒸汽发生器壳体大型锥形环件成型制造上的困难,提出了在大型数控径轴向RAW200/160-5型轧环机上实现锥形环件轧制成型的新工艺,并基于动力显式有限元Ansys/Ls_dyna软件建立了径轴向轧环机三维数值仿真模型,对锥形环件一个生产周期内的环件轧制过程进行了数值模拟,验证了新工艺的可行性。仿真计算结果还表明,采用计算机模拟环件轧制成形过程,能够实现观察环件扩展和缺陷生成的实时动态过程,能够实现从设备改造、毛坯结构设计到轧制工艺的优化,可以避免费时耗资的重复实验。

Aiming at solving the difficulties of prototype manufacturing of conical ring for the steam generator shell of 600MW Nuclear Reactor, this paper developed a new techniques for the prototype manufacturing of the great conical ring utilizing ring rolling technology based on RAW200/160-5 ring rolling. And based on the common dynamical explicit FEM software Ansys/Ls-dyna, a 3D model of Radial-axial Ring Rolling Mill is created to simulate the dynamic process of ring rolling within a conical ring producing period so as to prove the reliability of the new techniques. The result of the simulation also shows that the method can observe the real time dynamical process of ring enlarging and fleck generating; optimizing the billet structure and the rolling techniques, and at the same time, the repeated tests can be avoided.