铝合金异形截面环件轧制及其拉缩缺陷分析  

Analysis on rolling and shrinkage defects for aluminum alloy irregular cross-section ring

作　　者：郑继荣 兰箭[1,2] 周黎 韩振 Zheng Jirong;Lan Jian;Zhou Li;Han Zhen(School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,China;Hubei Key Laboratory of Modern Auto Parts Technology,Wuhan 430070,China)

机构地区：[1]武汉理工大学材料科学与工程学院,湖北武汉430070 [2]现代汽车零部件技术湖北省重点实验室,湖北武汉430070

出　　处：《锻压技术》2023年第10期129-133,共5页Forging & Stamping Technology

基　　金：国家重点研发计划(2022YFB3705500);国家自然科学基金资助项目(51975439)。

摘　　要：以外径为Φ350 mm的内凹形截面铝合金环件为研究对象,设计了两种不同的环件毛坯,采用ABAQUS有限元软件对环件轧制过程进行数值模拟。通过模拟计算分析了内凹型截面铝合金环件轧制过程中拉缩缺陷的形成过程和形成机理,发现环件内侧的径向拉缩随着环坯与芯辊的逐渐贴合呈现先增大后消失的现象,底部的轴向拉缩越靠近内侧,其尺寸越大。轧制过程中,最大塑性等效应变位于环件外表面中部位置;轧制结束时,环件中部的塑性变形较大,下部区域的等效应变较小。此外,对两种环件毛坯的填充效果、轧制力和等效应变进行了对比分析,结果表明,采用异形毛坯具有更好的填充效果和更小的轴向偏载。根据模拟结果对异形毛坯进行了轧制实验,轧制出合格的目标环件。For an concave cross-section aluminum alloy ring with an outer diameter ofΦ350 mm,two different ring blanks were designed,and the ring rolling process was numerically simulated by finite element software ABAQUS.Then,the formation process and formation mechanism of shrinkage defects during the rolling process of aluminum alloy rings with concave cross-sections were analyzed by simulation calculations.The results show that the radial shrinkage on the inside of the rings first increases as the ring blank and the mandrel rollers gradually fits together,and then gradually disappears,and the closer the axial shrinkage at the bottom is to the inside,the larger its size is.During the rolling process,the maximum plastic equivalent strain is located in the middle position of the outer surface of the ring,and at the end of the rolling,the plastic deformation is larger in the middle section of the ring,while the equivalent strain in the lower area is smaller.Furthermore,the filling effect,rolling force,and equivalent strain of the two ring blanks were comparatively analyzed.The results show that using the irregular blanks,the parts have better filling effect and smaller axial offset load.Based on the simulation re-sults,rolling experiments are conducted on irregular blanks,and qualified target ring parts are rolled.

关 键 词：异形截面 环件轧制 拉缩缺陷 铝合金环件 异形毛坯 

分 类 号：TG306[金属学及工艺—金属压力加工]