锻压技术

反胀对双相钢复杂曲面件充液拉深变形的影响

英文标题：Influence of backward-bulging on deformation of complex-shaped parts of

关键词：充液拉深反胀双相钢复杂曲面件

分类号：

出版年,卷(期):页码：2015,40(1):43-47

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.

基金项目：

陈保国(1979-)，男，博士研究生

参考文献：

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