挤吹件后冲切工艺中刀具展角对高温管体的残余应力影响  

Effect of Tool Angle on Residual Stress of High-temperature Pipe in Punching Process After Extrusion Blowing Parts

作　　者：刘晓杰 李国富[1,2] 陈韬 LIU Xiaojie;LI GuoFu;CHEN Tao(Faculty of Mechanical Engineering and Mechanics,Ningbo University,Ningbo Zhejiang 315211,China;Institute Of Advanced Energy Storage Technology And Equipment,Ningbo Zhejiang 315211,China)

机构地区：[1]宁波大学机械工程与力学学院,浙江宁波315211 [2]宁波大学先进储能技术与装备研究院,浙江宁波315211

出　　处：《机械设计与研究》2021年第2期117-121,127,共6页Machine Design And Research

摘　　要：为解决挤吹件生产中的高温管体在后冲切工艺中过度变形,基于冲裁力公式分析工艺参数中的刀具展角带来的剪切线变化对残余应力的影响,发现在刀具侧刃在即将离开管体时,剪切线会有短暂的激增。并通过简化刃尖刺破管体的受力模型,得到冲切截面中的变形状态验证仿真模型。后以管体端面的平均应力和刀具的冲裁力为指标,仿真发现相比90°的平切刀,45°~65°展角的刀具通过增加16%行程平均作用力,降低了近50%的残余应力,此规律与剪切线理论相吻合。In order to solve the excessive deformation of the high-temperature pipe body in the production of extruded blowing parts in the post-punching process,based on the blanking force formula,the influence of the shear line change caused by the tool spread angle in the process parameters on the residual stress is found.And it is found that the the shear line will increase briefly when the blade is about to leave the tube.And by simplifying the force model of the blade tip piercing the pipe body,the deformation state verification simulation model in the punching section is obtained.After taking the average stress of the pipe end surface and the blanking force of the tool as indicators,the simulation found that compared with the 90°flat cutter,the 45°~65°spread angle of the tool increases 16%stroke average force,which reduces nearly 50%residual stress,and this law is consistent with the shear line theory.

关 键 词：后冲切工艺 刀具展角 剪切线 残余应力 

分 类 号：TH122[机械工程—机械设计及理论]