梯度拉延筋拟合下降型变压边力方法研究  

Research on Fitting Method of Descending VBHF by Gradient Drawbead

作　　者：龚志辉[1,2] 周顺峰[1] 兰质纯 李琳[1] 

机构地区：[1]湖南大学汽车车身先进设计削造国家重点实验室,湖南长沙410082 [2]华中科技大学塑性成形模拟及模具技术国家重点实验室,湖北武汉430074

出　　处：《热加工工艺》2014年第19期1-6,共6页Hot Working Technology

基　　金：国家863计划项目(2012AA111802);华中科技大学材料成形与模具技术国家重点实验室开放基金项目(2011-P10);重庆理工大学汽车零部件制造及检测技术教育部重点实验室开放基金项目(2011KLMT06);湖南大学“青年教师成长计划”项目(2012-2007065)

摘　　要：针对变压边力中最常见的下降型变压边力,提出了梯度拉延筋拟合的方法,从而可以在恒压边力情况下拟合出下降型变压边力冲压的效果。该方法首先通过恒压边力计算获取需要的变压边力的区域,然后应用优化计算获取下降型变压边力曲线。通过转换计算出变压边力对板料约束力随板料边缘流动距离变化的关系曲线,并由此拟合出梯度拉延筋约束力曲线,再根据它确定拉延筋的数目、分布位置及约束力大小。该方法既可以用来拟合整体下降型变压边力,也可以用来拟合分区变压边力。通过算例验证了该方法的可行性。Aiming at the most common descending type in variable blank holder force（VBHF）, a gradient drawbead fitting method was presented, which could fit the stamping effect of descending type VBHF in the constant BHF condition.First, the needful VBHF region is obtained by the calculation of the constant BHF. And then, the descending VBHF curve is obtained by using optimization calculation. The relationship curve of VBHF on the constrained force（changing with the edge of the sheet moving distance） of the sheet metal is computed out through conversion, from which the gradient drawbead constrained force curve is fitted. Then, according to the gradient drawbead constrained force curve,the number and distribution position of drawbead and constrained force size are determined. The method can be used for fitting the whole descending type in VBHF and fitting the partition in VBHF. The feasibility of the method was verified through an example.

关 键 词：冲压 变压边力 拉延筋 

分 类 号：TG386.3[金属学及工艺—金属压力加工]