Friction in Double Action Extrusion
Friction in Double Action Extrusion
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双动挤压中的摩擦
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
Jurek Duczczyk
中科院分区：
文献类型：
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作者：
Li Wang;J. Zhou;Jurek Duczczyk
提出了一种新的挤压试验方法--双动挤压法（DAE），以突出铝挤压过程中模具轴承处摩擦的影响。结果发现，挤出物的长度和挤出力确实对模具轴承长度敏感，从而对摩擦力敏感。进行DAE的FEM模拟以在从0.2到1的宽范围的摩擦因子/系数上评估剪切摩擦模型和库仑摩擦模型。完全粘着摩擦似乎最能代表热铝与模具之间的界面接触。剪切摩擦模型中的摩擦系数值在0.3到0.6的范围内，通常用于描述有限元模拟中的坯料-模具界面处的接触，似乎太低。实验结果与模拟结果的比较表明，m = 1时的剪切摩擦模型对挤出力的预测效果最好，而μ = 1时的库仑摩擦模型对挤出物长度的预测效果最好。在现有的摩擦模型和摩擦因子/系数中，推荐使用m = 1的剪切摩擦模型来描述有限元模拟中的坯料-模具界面处的摩擦。
A novel extrusion testing method, double action extrusion (DAE), to highlight the effect of friction at the die bearing in aluminum extrusion was developed. It was found that the lengths of the extrudates and extrusion force were indeed sensitive to the die bearing length and thus to the friction. FEM simulations of DAE were carried out to evaluate the shear and Coulomb friction models over a wide range of friction factors/coefficients from 0.2 to 1. The full sticking friction appeared to represent the interfacial contact between hot aluminum and die the best. The friction factor values in the shear friction model over a range of 0.3 to 0.6 commonly used to describe the contact at the billet-die interface in FEM simulation appeared to be too low. The comparison between the experimental and simulation results indicated that the shear friction model at m = 1 predicted the extrusion force the best, while the Coulomb friction model at µ = 1 predicted the extrudate lengths the best. Of the existing friction models and friction factors/coefficients, it is recommended to use the shear friction model at m = 1 to describe the friction at the billet-die interface in FEM simulation.