摘要
针对某车型翼子板冲压成形过程的回弹变形问题,介绍了汽车覆盖件回弹产生的机理及影响因素,在运用汽车板成形分析软件Auto Form模拟制件的回弹量并进行模具型面补偿的基础上,提出了基于变压边力的拉伸过程回弹控制方法,即在成形初期采用小压边力而在成形后期采用大压边力的拉伸工艺,使板料由弹塑性变形转变为纯塑性变形,增加钣金成形的稳定性与精度。试验结果表明,通过采取上述措施,翼子板回弹现象基本消除,制件尺寸合格率由88.2%提升至92.6%。可为汽车覆盖件冲压模具设计提供参考。
Aiming at springback of a model fender in stamping process, the forming mechanism and influencing factors about springback of automobile covering parts were introduced in this paper. On the basis of using sheet metal forming analysis software AutoForm to simulate product springback and making compensation to die surface, a method of springback control in stretching process based on variable blank-holder force was proposed. The drawing technique that applied light blank holder force in the early of deformation and later using hard blank holder force was put to used, making sheet metal turn from elasto-plastic deformation into pure plastic deformation and increasing the stability and accuracy of sheet metal forming. Test results showed that by adopting the above measures, fender springback had been removed and pass rate of products improved from 88.2% to 92.6%. This paper can provide references for the mechanical design for cold die of automobile covering parts.
出处
《模具制造》
2018年第2期15-20,共6页
Die & Mould Manufacture
关键词
翼子板
回弹
型面补偿
变压边力
塑性变形
fender
springback
surface compensation
variable blank-holder force
plastic deformation
