摘要
针对2A12铝合金塑性较低,复杂曲面零件常规拉深成形容易产生起皱、破裂缺陷,提出预胀充液拉深成形。通过数值模拟和工艺试验对液压加载路径进行优化研究,获得不同加载路径对壁厚、应力及缺陷的影响规律,结合试验确定了合理的液压加载路径。结果表明:复杂曲面件成形过程中在优化的加载路径条件下既可产生必要的有益摩擦,改善成形过程的应力状态,又可避免悬空区的起皱及破裂,提高了零件壁厚分布的均匀性和成形极限。
Aiming at the poor pasticity of 2A 12 alluminum alloy, the wrinkling and the fracture in conventional deep drawing of complex-shaped components, hydromechanical deep drawing with prebulging is proposed. Loading path is optimized by numerical simulations and experiments, and effects of loading paths are obtained on thickness, stress and defects. Reasonable loading path is determined. The results show that a helpful friction can be generated, stress state can be improved, and wrinkle and fracture can be avoided. The uniformity of thickness and forming limit can be enhanced.
出处
《航天制造技术》
2009年第5期5-8,共4页
Aerospace Manufacturing Technology
基金
清华大学先进成形制造教育部重点实验室开放基金资助项目(2008005)
国家自然科学基金资助项目(50875062)
关键词
铝合金
预胀
充液拉深
液室压力
数值模拟
alluminum alloy prebulging hydromechanical deep drawing chamber pressure numerical simulation deep drawing
