Experimental and numerical analysis of friction in high aspect ratio combined forward-backward extrusion with retreat and advance pulse ram motion on a servo press
Experimental and numerical analysis of friction in high aspect ratio combined forward-backward extrusion with retreat and advance pulse ram motion on a servo press
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DOI：
10.1016/j.jmatprotec.2013.11.017
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发表时间：
2014-04
影响因子：
6.3
通讯作者：
R. Matsumoto;Kazunori Hayashi;H. Utsunomiya
中科院分区：
文献类型：
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作者：
R. Matsumoto;Kazunori Hayashi;H. Utsunomiya
提出了一种在轻质结构部件深孔反向挤压过程中保持润滑的方法，该方法利用伺服压力机和带有用于液体润滑剂供应的内部通道的冲头。在这种成形方法中，用伺服压力机以脉冲和步进模式相结合的方式将冲头推入试样中。当冲头后退时，足够的液体润滑剂通过内部通道周期性地供应到变形区。在本研究中，这种采用脉冲冲头冲头运动的成形方法在具有高长径比（高度/直径）的组合正向-反向挤压工艺中进行了测试。研究了脉冲冲头冲头运动挤压过程中铝样品的材料流动，以确定样品与冲头界面处的剪切摩擦系数。通过对脉冲冲头冲头运动挤压期间样品的材料流动进行有限元分析来评估冲头磨损。
A method for maintaining lubrication in the backward extrusion of deep holes for lightweight structural components is proposed utilizing a servo press and a punch with an internal channel for liquid lubricant supply. In this forming method, the punch is pushed into the specimen with a servo press in a manner that combines pulsed and stepwise modes. Sufficient liquid lubricant is periodically supplied to the deformation zone through the internal channel upon the retreat of the punch. This forming method with pulse punch ram motion was tested in combined forward-backward extrusion process with a high aspect ratio (height/diameter) in this study. The material flow of the aluminum specimen during the extrusion with pulse punch ram motion was investigated to determine the coefficient of shear friction at the specimen–punch interface. The punch wear was assessed by a finite element analysis of the material flow of the specimen during the extrusion with pulse punch ram motion.