锻压技术

拉胀工艺参数对半球形件成形极限的影响研究

英文标题：Study on influence of process parameters on forming limit of hemispherical parts in drawing-bulging

作者：刘利1 孔凡群1 2 林洪1 赵国际1

分类号：

出版年,卷(期):页码：2015,40(7):127-131

摘要：

为了提高半球形件拉胀成形的成形极限，研究了拉胀工艺参数压边力、摩擦系数、冲压速度以及凹模圆角对拉胀成形极限的影响规律。通过数值模拟分析与正交实验设计相结合的研究发现：影响成形极限最大的因素是压边力，其次是凹模圆角和摩擦系数，而冲压速度对成形极限的影响程度相对较弱；成形极限高度随着压边力、摩擦系数以及冲压速度的增加而降低，而随着凹模圆角的增大而增大。综合分析，为了提高半球形件拉胀成形极限，最合适的压边力为20 kN，凹模圆角为12 mm，摩擦系数为0.125，冲压速度为2000 mm·s-1。最后通过工艺实验表明，试验结果与模拟结果相一致，大大提高了半球形件的拉胀成形极限。

In order to improve the forming limit of drawing-bulging hemispherical parts, the influences of blank holder force, friction coefficient, stamping speed and die fillet radius on drawing-bulging forming limit were studied. Combining numerical simulation with orthogonal experiment，it is found that the biggest factor that effects the drawing-bulging forming limit is the blank holder force, which is followed by die fillet radius and friction coefficient, and while the effect of stamping speed is relatively weak. The drawing-bulging forming limit decreases with the increase of blank holder force, friction coefficient and stamping speed and with the decrease of die fillet radius. In a word,in order to improve the drawing-bulging forming limit of hemispherical parts, the suitable parameters are selected as blank holder force 20 kN, die fillet radius 12 mm, friction coefficient 0.125 and stamping speed 2000 mm·s-1. Finally, process testing shows that the simulation result is consistent with the experimental result, and the drawing-bulging forming limit is improved greatly.

基金项目：

重庆市教委科学技术研究项目（KJ132105）

刘利（1968-），女，本科，实验师

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