摘要
针对大型锥形筒件传统制造方法存在的成形效率低、成形件性能差和尺寸难控制等缺点,提出一种大型管坯分区冷却缩口、多次扩口混合的热模压成形方法。基于商用有限元软件ABAQUS,构建了热力耦合仿真模型,优化了大型管坯热成形工艺,并通过对比仿真和所设计的缩比实验结果,验证了仿真模型的准确性与成形工艺的可行性。研究结果表明:提出的成形方法能够满足大型锥形筒件的加工要求,同时,分区冷却工艺对大型锥形筒件成形效果有显著影响,在冷却缩口过程中,冷却区和成形区的强度均随冷却时间的增加而增大,当单位厚度冷却时间为1.714 s·mm^(-1)时,冷却缩口成形效果最佳,既保证了冷却区强度,又使成形区具有足够的塑性;管坯最大冷却区长度为1580 mm,当冷却区长度为1480 mm时,能够避免因长度不合适导致冷却过渡区域产生缺陷的现象。
Aiming at the shortcomings of the traditional manufacturing methods of large-scale conical cylinder,such as low forming efficiency,poor performance and difficult size control of the forming parts,a hot die forming method mixing with partitioned cooling shrinkage and multiple flaring for large-scale tube billets was proposed. Based on commercial finite element software ABAQUS,a thermo-mechanical coupled simulation model was built to optimize the hot forming process of large-scale tube billet. The accuracy of the simulation model and the feasibility of the forming process were verified by comparing the simulation results with designed scaled experimental results. The study results show that the proposed forming method can meet the processing requirements of large-scale conical cylinder,and the partitioned cooling process has a great influence on the forming effect of large-scale conical cylinder. The strength of the cooling zone and the forming zone increases as the cooling time increases during cooling necking process. When the cooling time per unit thickness is 1. 714 s·mm^(-1),the cooling necking forming effect is the best,which not only ensures the strength of the cooling zone,but also allows the forming zone to have sufficient plasticity. The maximum cooling zone length of the tube billet is 1580 mm. When the cooling zone length is 1480 mm,the defects caused by unsuitable length in cooling transition zone can be avoided.
作者
孙浩博
陈响军
徐斌
孙明月
SUN Hao-bo;CHEN Xiang-jun;XU Bin;SUN Ming-yue(Key Laboratory of Nuclear Materials and Safety,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;Nano Science and Technology Institute,University of Science and Technology of China,Suzhou 215123,China;Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China)
出处
《塑性工程学报》
CAS
CSCD
北大核心
2021年第5期192-201,共10页
Journal of Plasticity Engineering
基金
国家重点研发计划项目(2016YFB0300401,2018YFA0702900)
国家自然科学基金资助项目(51774265)
国家科技重大专项(2019ZX06004010)
中国科学院战略先导专项(XDC04000000)
中核集团领创项目
中国科学院青年创新促进会和中国科学院2017年度创新交叉团队项目。
关键词
大型锥形筒件
分区冷却
管坯缩扩口
塑性成形
数值模拟
large-scale conical cylinder
partitioned cooling
tube billet necking and expanding
plastic forming
numerical simulation
