论文部分内容阅读
Zr-4厚壁管件是核电站燃料供给系统中的重要零件,挤压成形后需要三点弯矫直工艺减少后续加工量。其矫直过程是微小弹塑性变形过程,通过分析弹性、弹塑性和回弹三阶段的应力应变变化,形成管件M-ξ-β方程,反映弹塑性弯曲变形和卸载间关系。基于Zr-4管材料特性,建立弹性线性强化本构模型,计算矫直挠度,提出Zr-4厚壁管矫直行程计算方法。经过对多根最大弯曲变形20 mm,具有6个检测点、长5 m厚壁Zr-4管进行矫直实验,矫直后弯曲量均小于0.50 mm,矫直时间由手工矫直1.5 h/根减少到22.5 min/根,表明该矫直行程计算方法具有一定的实用性。
Zr-4 thick-walled pipe is an important part of nuclear power plant fuel supply system, after extrusion forming three-point bending straightening process to reduce the amount of follow-up. The straightening process is a tiny elastic-plastic deformation process. The M-ξ-β equation of the tube is formed by analyzing the stress-strain changes in three stages of elasticity, elasto-plasticity and springback, which reflect the relationship between elastic-plastic bending deformation and unloading. Based on the properties of Zr-4 tube material, a linear elastic constitutive model was established to calculate the straightening deflection, and a method to calculate the straightening stroke of Zr-4 thick-walled tube was proposed. After straightening 20 mm multi-root bending test with 6 test points and 5 m long thick Zr-4 tube, the bending amount after straightening was less than 0.50 mm and straightening time was 1.5 h / Root reduced to 22.5 min / root, indicating that the straightening stroke calculation method has some practicality.