摘要
充液成形技术是一种有效解决复杂薄壁零件成形问题的方法。针对321不锈钢V形件常规拉深成形需要多道次成形、工艺冗余的问题,通过分析V形件充液成形过程中易出现失稳现象,设计了带初始反胀的充液成形的技术方案。结合数值模拟,对薄壁V形件充液成形过程中出现的凸模侧壁破裂、法兰区起皱等失稳形式进行了研究,优化了液室压力加载曲线、压边间隙、初始反胀压力及初始反胀高度。结果表明,V形件在优化的工艺参数条件下成形既可产生"摩擦保持"的效果,改善了应力状态,又可避免凸模侧壁破裂和法兰区起皱,提高了零件成形极限和壁厚分布的均匀性。
Hydroforming is an effective method to solve the problem of thin-walled parts forming.Aiming at the multi-stage problem and process redundancy for common deep drawing of 321 stainless steel V-shaped components,hydroforming with pre-bulging proposal was designed by analyzing defects during V-shaped components forming.Combined with numerical simulation,punch sidewall fracture and flange wrinkle during V-shaped component forming were studied,while cavity pressure loading path,blankholder gap,pre-bulge pressure and pre-bulge height were optimized.The results show that a helpful friction can be generated in the optimized parameters condition,stress state can be improved,and sidewall fracture and flange wrinkle can be avoided.Forming limit and the uniformity of thickness can be enhanced.
出处
《锻压技术》
CAS
CSCD
北大核心
2012年第5期51-55,共5页
Forging & Stamping Technology
基金
商飞基金资助项目(829-C919-01-1)
关键词
321不锈钢
V形件
充液成形
数值模拟
初始反胀
321 stainless steel
V-shaped components
hydroforming
numerical simulation
pre-bulge
