摘要
连续多点成形中的皱曲是一重要的成形缺陷。阐述连续多点成形技术的原理,建立球形件的有限元模型,并采用数值模拟的方法研究连续多点成形中皱曲的情况。得到0.5mm厚08Al钢板在成形过程中起皱缺陷的模拟结果。结果表明:皱曲主要产生在板材的两侧区域和两端区域。利用板材不同区域壳单元中面的主应变状态分析不同区域不起皱和起皱的原因。得到0.5mm、1.0mm、1.5mm和2.0mm厚08Al钢板在不同压下量下的端部起皱模拟结果。结果表明:板厚相同,压下量越大,起皱越严重;压下量相同,板厚越大,越不易起皱。分析端部皱曲的变化规律并做出合理解释,做了相关的试验验证,试验结果与模拟结果基本吻合。
Wrinkling is a crucial forming defect in continuous multi-point forming process.Principle of continuous multi-point forming is explained.Finite element analysis model of spherical surface is established.Numerical simulation method is adopted to study the wrinkling.Simulation result of wrinkle of 08Al sheet metal with 0.5 mm thickness during forming process is obtained.The result shows that wrinkles happen on two sides and two ends of sheet metal.Reasons for wrinkles happening and not happening are analyzed by use of principal strain states of shell element middle surface in different regions of sheet metal.Simulation results of wrinkles on ends of 08Al sheet metal with 0.5 mm,1.0 mm,1.5 mm and 2.0 mm thickness under different displacements of upper flexible roller are obtained.The results show that when thicknesses of sheet metal are identical,the deeper the displacement of upper flexible roller is,the more serious the wrinkles will be ;when displacements of upper flexible roller are identical,the thicker the sheet metal,the more difficult the happening of wrinkles.The change rule of wrinkles on ends of sheet metal is analyzed and explained reasonably.Experiments are carried out.Experimental results basically agree with simulation results.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2010年第22期31-35,共5页
Journal of Mechanical Engineering
基金
国家高技术研究发展计划(863计划
2009AA04Z117)
国家自然科学基金(50575090)资助项目
关键词
板材成形
柔性成形
三维曲面
数值模拟
Sheet metal forming Flexible forming Three-dimensional surface Numerical simulation
