矩形盒件拉深成形规律及失效分析  

Analysis on deep drawing forming regularity and failure of rectangular box parts

作　　者：陈渝 胡志力[2] 严勇[2] 刘双喜 苏永成 黄叶萍 

机构地区：[1]江麓机电集团有限公司工艺研究院,湖南湘潭411100 [2]武汉理工大学汽车工程学院,湖北武汉430073 [3]中国铁建重工集团有限公司,湖南长沙410100

出　　处：《锻压技术》2015年第8期52-58,共7页Forging & Stamping Technology

基　　金：江麓机电集团有限公司科研项目:铝合金薄板零件深成形工艺研究(江机研发字【2014】)

摘　　要：矩形盒件在拉深成形过程中易出现起皱、拉裂等形式的失效,严重制约着成形件的使用性能。基于Dynaform进行了三维动态仿真,分析了毛坯形状、压边间隙等因素对其成形极限及壁厚分布的影响,预测了坯料成形过程中失效的产生,并结合实际进行了验证。结果表明:相同尺寸的坯料,采用圆形切弓形坯料比圆形坯料更有利于获得成形效果较好的盒形件;随着压边间隙的增大,成形盒形件的拉裂趋势有所减缓,但失稳起皱趋势越来越严重,当压边间隙从1.2t增大到1.4t时,壁厚的最大减薄率从87.79%减小到33.48%,成形件的拉裂趋势得到有效缓解;实际的拉深试验验证了有限元仿真分析的有效性。In the process of deep drawing forming for rectangular box parts, failures such as wrinkling and crack are easy to occur, which seriously affect the performance of forming parts. Three-dimensional dynamic simulation was conducted by Dynaform, and influences of factors such as the blank shape and the blank holder gap etc. on the forming limit and wall thickness layout were analyzed, from which the failure of production during forming process was predicted and verified. The results show that with the same size of the blank, it ob- tains a better forming result of box-shaped part by the circular cutting bow-shaped blank than by the circular blank. By enlarging the blank holder gap, the crack trend of forming box-shaped parts gets smaller, but the possibility instability wrinkling increases. When the blank holder gap increases from 1.2t to 1.4t, the maximum wall thickness reduction ratio decreases from 87. 79% to 33.48% , therefore the crack trend of forming part is effectively eased. Finally, the effectiveness of finite element simulation analysis is verified in the drawing tests.

关 键 词：矩形盒件 坯料形状 压边间隙 有限元仿真 

分 类 号：TG386[金属学及工艺—金属压力加工]