基于滑移线场的钢质薄壁活塞冷挤压工艺研究

Study on Cold Extrusion Process for Thin-wall Steel Piston Based on Slip-lines Field

依据钢质薄壁活塞的冷挤压工艺方案绘制出解决活塞类轴对称杯形件薄壁成形问题的滑移线场。首次建立了壁厚、摩擦因子、材料剪切强度与单位接触应力的数学模型;利用Qform-3D对活塞冷挤压工艺过程进行了数值模拟分析,证实了上述数学模型对活塞冷挤压成形中挤压力的计算是有用的。

According to the cold extrusion process for steel thin-wall piston, the slip line field of solving forming problems of axis symmetrical cup-shaped thin-wall pieces for the pistons was drawn. A mathematical model which contains wall thickness, friction factor, material shear strength and unit contact stress was first established; the process of cold extrusion forming for pistons was numerically simulated by Qform-3D. It was confirmed that the above mathematical model is useful to pressure calculation of cold extrusion forming for pistons.