带内法兰的超大型阶梯筒体仿形锻造理论与方法  

Profiling forging theory and method of ultra-large stepped cylinder with inner flange

作　　者：陈飞[1] 周琦杰 董凯 陶智勇 张智峰 崔振山[1] Chen Fei;Zhou Qijie;Dong Kai;Tao Zhiyong;Zhang Zhifeng;Cui Zhenshan(Institute of Forming Technology&Equipment,Shanghai Jiao Tong University,Shanghai 200030,China;Shanghai Electric SHMP Casting&Forging Co.,Ltd.,Shanghai 200245,China)

机构地区：[1]上海交通大学塑性成形技术与装备研究院,上海200030 [2]上海电气上重铸锻有限公司,上海200245

出　　处：《锻压技术》2024年第7期147-159,共13页Forging & Stamping Technology

基　　金：国家自然科学基金资助项目(52275352)。

摘　　要：变截面超大型筒体锻件是核岛承压设备的关键金属构件,其直径和高度超过5 m,内外径差达1倍以上,整体成形难度极大,为了解决该问题,提出一种基于收口工艺的变截面超大型筒体仿形锻造新方法。探索了芯轴扩孔过程中材料流动规律,建立了材料变形解析计算模型,实现了筒形件芯轴扩孔工艺的快速设计;探讨了不同坯料形状对收口工艺的影响规律,获得了收口工艺参数,并在此基础上采用局部成形将小尺寸部分锻为带内法兰的阶梯结构,最终通过变径芯轴扩孔拔长工艺进一步成形锻件内法兰结构;通过缩比实验验证了变截面超大型筒体仿形锻造工艺方案的可行性。Ultra-large cylinder forgings with variable cross-section are key metal components of nuclear island pressure equipment,its diameter and height exceed 5 m and the difference of inner and outer diameters is more than one times which make the overall forming extremely difficult.In order to solve this problem,a new method of profiling forging for ultra-large cylinder with variable cross-section based on the closing process was proposed.The material flow law during the mandrel reaming process was explored.A material deformation analysis calculation model was established to realize the rapid design of the mandrel reaming process for cylindrical parts.The influence laws of different billet shapes on the closing process was explored,and the parameters of closing process were obtained.Based on this,the local forming was adopted to forge the small-sized part into a stepped structure with inner flange.Finally,through the variable diameter mandrel reaming and drawing process,the inner flange structure of forgings was further formed.The feasibility of the profiling forging process scheme for ultra-large cylinder with variable cross-section was verified through scaling experiments.

关 键 词：超大型筒体 仿形锻造 收口工艺 局部镦粗 局部整形 

分 类 号：TG385[金属学及工艺—金属压力加工]