反胀对双相钢复杂曲面件充液拉深变形的影响  

Influence of backward-bulging on deformation of complex-shaped parts of dual-phase steel in hydrodynamic deep drawing process( HDD)

作　　者：陈保国 宋波 黄志斌 何雪婷 徐永超[2] 苑世剑[2] 

机构地区：[1]上海飞机制造有限公司,上海200043 [2]哈尔滨工业大学材料科学与工程学院,黑龙江哈尔滨150001

出　　处：《锻压技术》2015年第1期43-47,共5页Forging & Stamping Technology

摘　　要：采用包含反胀、压平和拉深成形三个阶段的反胀充液拉深成形方法,得到不同反胀预变形时双相钢DP590的反胀预成形件和终成形件,研究了反胀对充液拉深成形件壁厚、应变的影响。结果表明:对于复杂曲面件反胀充液拉深,反胀高度存在极限值,当超过极限值时,试件出现折叠缺陷,限制了反胀量的提高;相对于普通充液拉深,反胀充液拉深对复杂曲面件底部有一定的强化效果,当相对反胀高度为16%时,可使底部壁厚减薄率增加2%、等效应变增大0.03,并且底部变形量随着反胀高度的增大而增加,而对直壁处变形基本无影响。Performed and final formed parts of DP590 steel with different backward-bulging pre-deformations were obtained by backward-bulging and HDD including three stages of backward-bulging, flatting and hydrodynamic forming, and the influence of backward -bulging on wall thickness and strain of HDD parts was studied. The results show that the height of pre-bulging has a limitation in complex curved surface part. When it exceeds its limit value, the fold defect occurs to prevent the backward-bulging value from increasing. Method of back-bulging and HDD has a certain strengthen effect on the bottom of complex curved surface part compared with normal HDD. The thinning rate of the thickness increases by 2% and the equivalent strain increases by 0. 03 when the relative pre-bulging height is up to 16%. Furthermore, pre-bulging height increases with the enlarging of bottom deformation, and it has little effects on the deformation of straight wall.

关 键 词：充液拉深 反胀 双相钢 复杂曲面件 

分 类 号：TG386.32[金属学及工艺—金属压力加工]