难成形材料复杂型面零件充液成形失稳控制研究

Research on hydroforming failure control strategy of complex surface part made of hard shaping material

探讨了充液成形过程中,关键工艺参数之一的液室压力大小对起皱和破裂两种失稳现象的作用和影响规律。从应力、应变、减薄率和FLD曲线等方面研究了液室压力对起皱和失稳现象的影响。首先模拟液室压力为12 MPa时的成形过程,分析了起皱的原因,再通过加大压力对起皱进行控制;而后模拟液室压力为35 MPa时的成形过程,分析了破裂的原因,再通过减小压力对破裂进行控制;最后利用难成形航空材料2806-M进行实验验证,得到了成形此零件的合理压力范围18～25 MPa。

The effect rule of one key technologic parameter in sheet hydroforming to the winkling and cracking failures of liquid pressure was discussed. The rule of liquid pressure affecting the winkling and cracking was researched from the factors of stress, strain, thinning and FLD. Firstly, the cause of winkle was analyzed by simulating lower pressure of 12 MPa, and then , wrinkling was solved by increasing the pressure. Secondly, the cause of crack was analyzed by simulating higher pressure of 35 MPa and the cracking was solved by decreasing the pressure. At last, by forming the part of 2B06 - M, one of the difficult forming materials used in aerial manufacture, the better range for forming this part gained was 18-25 MPa.