板料成形中的新型可控压边力技术研究  

A new strategy for the optimization of variable blank holder force in sheet metal forming

作　　者：王武荣[1] 陈关龙[1] 林忠钦[1] 李淑慧[1] 

机构地区：[1]上海交通大学机械与动力工程学院车身制造技术中心,上海200030

出　　处：《塑性工程学报》2007年第1期102-108,共7页Journal of Plasticity Engineering

基　　金：国家青年科学基金资助项目(50225520)

摘　　要：板料成形中,压边力是控制板料流动的重要因素。前人大量的研究表明,在拉伸成形的不同行程施加合适的变压边力(VBHF),可有效避免板料成形中起皱和破裂的缺陷。文章基于压边力成形窗口的定义和分析,提出新的控制目标,并采用PID闭环控制策略来优化不同冲压行程中分块压边圈上的压边力。针对一个具有不同角部半径的盒型件进行了闭环的变压边力优化模拟,得到其不同位置的分块压边圈随行程变化的最优压边力曲线,并在变压边力压机上进行实验验证,结果表明,使用铝合金板料并在恒定压边力下难以成形的盒形件,在最优变压边力下成功成形。Blank holder force （BHF） is one of the key parameters controlling material flow in sheet metal forming. Numerous re searches have demonstrated that an appropriate variable blank holder force （VBHF） during punch stroke is an effective technique to suppress the wrinkling for both flange and sidewall and delay the onset of tearing. In this paper, a new control objective is proposed based on the definition and analysis of BHF formability window. And then a closed-loop PID control strategy is established to determine the optimal variable BHF for each segmented binder during the punch stroke. Then a rectangular box with different corner radii using segmental binders is adopted to validate the closed loop simulation, through which the optimal profile of variable BHF is determined for each segmental binder at different punch travel. The simulated result shows the box which is difficult to be formed under constant BHF using aluminum alloy sheet could be stamped successfully without wrinkling and tearing. Finally, the derived trajectories of optimal BHF of the rectangular box were verified on a multipoint variable BHF hydraulic press and the experiment results correspond well with those of FEM simulation.

关 键 词：压边力 闭环模拟 PID控制 板料成形 

分 类 号：TG386.32[金属学及工艺—金属压力加工]