摘要
薄壁管弯曲成形过程中芯棒对弯管的成形质量影响较大,芯棒形式的选取是否合理直接关系着管件成形质量的优劣。采用有限元平台ABAQUS/Explicit建立不锈钢管三维仿真模型,讨论了圆柱式、圆头式、弧式、球窝式和圆头球窝式5种形式的芯棒对弯管成形质量的影响,并对球窝式芯棒进行了实验验证。结果表明:在球窝式和圆头球窝式等关节式芯棒的支撑下弯曲管件的外壁减薄率比圆柱式、圆头式以及弧式芯棒等整体式芯棒高;弧式芯棒较有利于减轻管件弯曲后外壁减薄情况;球窝式芯棒有利于获得综合性能更好的成形管件;有限元仿真模型能够较可靠地模拟实际数控弯曲成形,为生产加工芯棒的选取提供了理论指导。
Mandrel shows a great influence on the quality of the tube during tube bending process. Especially, the selection of mandrel type directly affects the forming quality of the tube. In the paper, a 3D simulation model of stainless steel tube was established by finite element platform ABAQUS/Explicit. The influence of five kind mandrels on the quality of bended tube was investigated by simulation and experiment. It is found that the cylin- der, round and arc mandrels show a great advantage in controlling the outer wall thinning compared with ball and round ball mandrels. Arc mandrel is benefit to reduce wall thinning of tube bending, while the ball mandrel exhibits the best performance among all the five kind mandrels during tube bending. The finite element simulation results show good agreement with the experimental results, and provide a theoretical guidance for the selection of the mandrel type in the actual production.
出处
《机床与液压》
北大核心
2015年第12期52-59,共8页
Machine Tool & Hydraulics
基金
supported by the Fundamental Research Funds for the Central Universities ( 2014-IV042)
关键词
薄壁管
数控弯曲
芯棒
有限元仿真
Thin-walled tube, NC bending, Mandrel, Finite element simulation
