加载路径对扭力梁内高压成形壁厚分布和精度的影响.pdfVIP

第20卷摇 第4期 材摇 料摇 科摇 学摇 与摇 工摇 艺 Vol.20 No.4 摇 摇 20 12年8月 MATERIALS SCIENCE TECHNOLOGY Aug. ,2012 摇 摇 摇 摇 摇 摇 加载路径对扭力梁内高压成形壁厚分布和 精度的影响 1 1 1 2 2 2 张伟玮 ,韩摇 聪 ,苑世剑 ,曹摇 伟 ,丁摇 勇 ,赵福全 (1.哈尔滨工业大学 金属精密热加工国家重点实验室,哈尔滨 150001;2.浙江吉利汽车研究院有限公司,杭州310000) 摘摇 要:为研究加载路径(内压力和轴向补料的匹配关系)对扭力梁内高压成形的影响,通过数值模拟和试 验研究的方法,研究了不同加载路径对局部截面壁厚分布和管件成形精度的影响规律.研究发现:当补料初 始压力过低时,在端部区域起皱;当补料初始压力过高时,补料全部集中在端部区域;当补料量过小时,壁厚 改善不明显;补料量过大时,端部区域起皱.研究结果表明:初始压力为30 MPa,补料量15 mm 时为合理加载 路径,此时内高压成形件壁厚减薄较小,成形精度较高. 关键词:加载路径;减薄率;成形精度;内高压成形;扭力梁 中图分类号:TG394 文献标志码:A 文章编号:1005-0299(2012)04-0001-06 Effect of loading paths on thickness distribution and precision of a hydroformed torsion beam 1 1 1 2 2 2 ZHANG Wei鄄wei ,HAN Cong ,YUAN Shi鄄jian ,CAO Wei ,DING Yong ,ZHAO Fu鄄quan (1 .National Key Laboratory of Precision Hot Processing of Metals,Harbin Institute of Technology,Harbin 150001,China; 2. Zhejiang Geely Automobile Research Institute Co.Ltd. ,Hangzhou310000,China) Abstract:The performance of hydroformed torsion beam can be affected by loading paths (relations between pressure and axle feed).This article analyzes the effect of different loading paths during hydroforming on re鄄 duction rateofthicknessandformingprecisionbynumericalsimulationandexperiments.Whentheinitialpres鄄 sure is lower,there will be a wrinkle,and when the initial pressure ishigher,the thicknessonly in the end in鄄 creases.If the axle feed is smaller,its effect on thickness distribution is not obvious,otherwise,there