基于U型钣件弯边精度的分步橡皮垫成形数值模拟与实验  

Numerical simulation and experiment of stepped rubber-pad forming based on U-shaped panel bending accuracy

作　　者：冯远丙 徐雪峰[1] 范玉斌 付春林[1] FENG Yuan-bing;XU Xue-feng;FAN Yu-bin;FU Chun-lin(School of Aviation Manufacturing Engineering,Nanchang Hangkong University,Nanchang 330063,China)

机构地区：[1]南昌航空大学航空制造工程学院

出　　处：《塑性工程学报》2019年第5期70-77,共8页Journal of Plasticity Engineering

基　　金：江西省重大专项大飞机典型难加工钣金件数字化精确成形关键技术研究(20165ABC28002)

摘　　要：针对传统橡皮成形中设备吨位大,零件贴模度差,成形精度低等问题,提出了带水平两侧缸的分步橡皮成形方法,实现了橡皮垫的分步局部加载。基于ABAQUS有限元分析软件,在相等垂直下压量下,对比分析了传统橡皮成形和分步橡皮成形方法下零件的成形性能,同时探究了水平侧缸进给量对板材贴模度的影响,并完成了不同厚度的2A12铝合金U型件弯边实验。数值模拟与实验结果表明:在相等垂直下压量的前提下,分步橡皮成形方法有效地改善了板材贴模度,提高了成形精度,且成形力大大降低;当相对弯边高度h/t <4时,板材不宜采用橡皮成形工艺进行弯边成形;在分步橡皮垫成形过程中,为防止板料发生翘曲,水平侧缸的进给量应大于4 mm。A rubber forming method called stepped rubber-pad forming with horizontal cylinders was proposed for the problems of excessive tonnage of equipment,poor die attachment and low forming accuracy in traditional rubber forming. Local loading of rubber was realized by this method in the forming process. Under the same vertical displacement of container,the effects of traditional rubber forming and stepped rubber forming methods on formability were compared based on ABAQUS finite element analysis software. At the same time,the influence of the feed of horizontal side cylinder on the sticking degree of sheet metal was explored. The bending experiments of 2 A12 aluminium alloy U-shaped parts with different thicknesses were completed. The numerical simulation and experimental results show that the stepped rubber forming method can effectively improve the sticking degree and forming accuracy and greatly reduce the forming force under the same vertical displacement of container. When the relative bending height h/t < 4,the rubber forming process is not suitable for bending of sheet metal. In the stepped rubber-pad forming process,in order to prevent the sheet metal from warping,the feed of horizontal side cylinder should be more than 4 mm.

关 键 词：橡皮成形 分步成形 局部加载 U型件 精度 

分 类 号：TG386.41[金属学及工艺—金属压力加工]