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| 锅炉蛇形管弯头模弯成形数值模拟研究 |
| Numerical Simulation Study on the Elbow Die Bending of Boiler Coil Tubes |
| 投稿时间：2017-05-09 |
| DOI：10.13259/j.cnki.eri.2017.03.004 |
| 中文关键词: 蛇形管 弯头 模弯成形 数值模拟 |
| 英文关键词:coil-tube elbow die bending numerical simulation |
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| 中文摘要: |
| 蛇形管广泛应用于大型电站锅炉的省煤器、过热器、再热器等高温高压组件.对蛇形管弯头在模弯成形过程中的结构、尺寸和残余应力变化进行了数值模拟，并通过试验数据对数值模型进行了验证.研究结果表明：弯头的圆度随弯曲角度增加呈现先上升后减小的趋势，并在45°附近达到峰值；弯头壁厚的最大变化量与弯头变形率呈线性关系，塑性应变和残余应力水平均随弯头变形率的减小而呈现整体降低的趋势；此外，弯头弯制后残余应力在受滚轮挤压侧的内表面较为明显，而在弯头外表面的塑性变形更为显著. |
| 英文摘要: |
| Coil-tube is widely used as high-temperature and high-pressure components in large-scale utility boilers,such as economizer,superheater and reheater,etc.In this paper,numerical simulation study on the changes of the elbow structure,size and residual stress during the die bending process was carried out.The model was validated by the experiments.The results showed that as the bending angle increased,the roundness increased firstly,then reached the peak value at 45°,and decreased at last.The maximum changes of the tube wall thickness were linearly correlated with the deformation rate of the elbow.The elastic strain and residual stress reduced as the elbow deformation rate decreased.In addition,the residual stress existed obviously at the inner surface of elbow endline,while the elastic deformation occurred significantly at the outer surface of the elbow. |
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