铝合金复杂曲面薄壁罩体充液拉深失稳控制技术  

Failure control on hydroforming process of thin-walled aluminum alloy with complex surface covers

作　　者：王永铭[1] 祝世强[1] 杨微[1] 李杰[1] 张文忠[1] 袁楠[1] 康洪泽 付茂银 刘岩松 赵良 

机构地区：[1]首都航天机械公司,北京100076

出　　处：《锻压技术》2017年第9期69-73,共5页Forging & Stamping Technology

基　　金：民用航天技术预先研究项目(科工一司(2014)618号)

摘　　要：以某典型铝合金复杂曲面薄壁罩体为研究对象,采用数值模拟与工艺试验相结合的方法分析了凸模初始反胀位置与液室压力对成形失稳的影响规律,优化了成形工艺参数。结果表明,当凸模初始反胀位置低于凹模型面时,凸模进入凹模时悬空区板料没有液室压力的作用,悬空区板料处于一拉一压的应力状态,悬空区容易起皱;当凸模初始反胀位置在凹模型面上方时,凸模进入凹模时悬空区板料已经受到液室压力的作用,处于双向拉应力状态,因此可以抑制悬空区起皱;当液室压力较高时,悬空区板料承受较大的拉应力容易破裂。合理控制凸模初始反胀位置与液室压力可以消除悬空区起皱与破裂。For one typical thin - walled aluminum alloy cover with complex surface, the influences of the punch initial reverse bugling po- sition and the die cavity pressure on wrinkle were analyzed by numerical simulation and experiment method, and the process parameters were optimized. The resuhs indicate that if the punch initial reverse bugling position is below the die surface, there is no pressure in the die cavity with the punch entering the die, and the unsupported blanks are subjected to tensile stress along one direction and compressive stress along another direetion and easy to wrinkle. If the punch initial reverse bugling position is above the die surface, the unsupported blanks have been acted by the pressure in the die cavity with the punch entering the die and subjected to bidirectional tensile stress. Thus, the wrinkle can be controlled. If＇ the die cavity is over high, the unsupported blanks will suffer higher tensile stress, and crack is easy to occur. The unsupported blank wrinkle and crack can be eliminated by a reasonable control on the punch initial revere bugling po- sition and the die cavity pressure.

关 键 词：充液拉深 铝合金 薄壁复杂曲面罩体 失稳控制 初始反胀 

分 类 号：TG389[金属学及工艺—金属压力加工]