冷挤压模具磨损优化设计

Optimum Design of Cold Extrusion Die Wear

以凸缘螺母冷挤压模芯为例,建立凸缘螺母冷挤压成形的三维几何模型和有限元模型。通过对冷挤压成形过程的模芯磨损分析,设计基于摩擦系数、模具初始硬度、上冲棒冲压速度、模芯入口圆角半径大小的四因素三水平标准正交实验。通过Archard磨损模型和理论,在Deform-3D数值模拟分析软件中进行冷挤压模芯磨损的正交实验,获得模芯磨损量最小的最优四因素组合,研究四因素与模具磨损的影响关系,分析上冲棒冲压速度是模芯磨损的最大因素的原因。结果表明,通过正交实验和磨损模型能够准确地计算模芯磨损量,预测模芯寿命,改善工艺设计。

The cold extrusion three-dimensional geometric model and the finite element model of the flange nut were established by taking the flange nut＇s cold extrusion die as an example. By analyzing the core wear of the cold extrusion process, the four-factor three-level orthogonal experiment was designed based on the friction coefficient, initial hardness,punching speed, and the radius of the fillet entrance fillet. Through the Archard-wear model and theory, the orthogonal experiment of cold extrusion die wear in Deform-3 D numerical simulation software was carried out. The optimal four-factor combination with the smallest core wear was obtained, the relationship between four factors and mold wear was studied,and the reason why the punching speed of punching rods becomes the biggest factor of core wear was analyzed. The results show that, through the orthogonal experiment and wear model can accurately calculate the core wear, predict the life of the core, improve the process design.