八万吨模锻压机主缸焊接应力场有限元分析

发布时间：2018-06-15 04:08

本文选题：大型结构件 + 低合金高强钢　；参考：《焊接学报》2017年05期

【摘要】：针对八万吨模锻压机主缸焊接应力和变形难于精确控制的问题,建立了主缸焊接有限元模型,通过模拟计算和试验验证,得到了主缸焊接温度场、应力场和变形.结果表明,主缸焊接过程中焊缝温度最高,约为2 100℃,接头区域温度梯度最大.主缸焊后最大位移位于主缸顶部,位移量约为7.4 mm,焊缝区位移量较小.在焊接前应考虑对主缸底部和顶部进行约束,防止焊后产生较大变形.主缸焊缝区等效应力最大,约为470 MPa,热影响区应力次之,母材应力最小.在热处理前要注意接头上表面是否存在焊接裂纹等缺陷.以上结果为主缸实际焊接提供了计算数据参考.
[Abstract]:In view of the problem that the stress and deformation of the main cylinder of eighty thousand tons die forging press is difficult to accurately control, a finite element model of the main cylinder welding is established. The welding temperature field, stress field and deformation of the main cylinder are obtained by simulation calculation and test. The results show that the weld temperature of the main cylinder is the highest, about 2100 C, and the temperature gradient of the joint area is the most. The maximum displacement of the main cylinder after welding is located at the top of the main cylinder, the displacement amount is about 7.4 mm, the displacement of the weld zone is small. Before welding, the constraint of the bottom and the top of the main cylinder should be considered to prevent the large deformation after welding. The equivalent stress of the weld area of the main cylinder is about 470 MPa, the stress in the heat affected zone is the second and the base material stress is the least. The attention should be paid to the heat treatment before the heat treatment. There are defects such as welding cracks on the upper surface of the joint. The above results provide reference for the actual welding of the cylinder.
【作者单位】：内蒙古科技大学材料与冶金学院;
【基金】：国家科技重大专项资助项目(2009ZX04014-064-05) 内蒙古自治区自然科学基金资助项目(2016MS0510)
【分类号】：TG315;TG404

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