摘要
采用有限元数值模拟方法研究了薄板鞍型件在有压边多点成形过程中的拉裂现象。提出了能够避免拉裂的柔性压边成形方式,分析了刚性压边与柔性压边成形时的成形极限和成形效果,证明柔性压边成形能够很好地解决板料起皱与拉裂之间的矛盾,并利用压边面中板料的流动分析了柔性压边成形时压边力大小与拉裂之间的关系。当采用刚性压边多点成形时,加大压边力板料可能拉裂,减小压边力板料可能起皱;而采用柔性压边多点成形方式可以有效避免起皱和拉裂,大大提高变形量,得到更好的成形结果。
FEA numerical method was employed to study the sheet metal crack in the deformation of multi-point forming （MPF）, and to analyze the crack of saddle workpiece with blank holder forming. Then a flexible blank holder forming mode was proposed to avoid crack by improving the processes. The forming limits and forming effects of rigid and flexible blank holder formings were analyzed. It was shown that the contradiction between wrinkle and crack can be settled by flexible blank holder forming. The relation between crack and the holding force was also studied by analyzing the sheet metal flow on the surface of the blank holder. Results indicate that in rigid blank holder forming, large holding force may induce crack in the sheet metal, while small holding force may lead to wrinkle. In flexible blank holder forming, both crack and wrinkle can be avoided and the deformation can be significantly increased, thus much better forming result is obtained.
出处
《吉林大学学报（工学版）》
EI
CAS
CSCD
北大核心
2007年第5期1101-1105,共5页
Journal of Jilin University:Engineering and Technology Edition
基金
国家自然科学基金资助项目(50275063)
吉林大学'985工程'资助项目
关键词
材料合成与加工工艺
多点成形
柔性压边
刚性压边
数值模拟
拉裂
materials synthesis and processing technology
multi-point forming
flexible blank holder
rigid blank holder
numerical simulation
crack
