Analysis of Metal Flow of Aluminum through Long Choked Die Channels
Analysis of Metal Flow of Aluminum through Long Choked Die Channels
复制标题
铝通过长扼流模具通道的金属流动分析
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
H. Valberg
中科院分区：
文献类型：
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作者：
H. Valberg
研究了无润滑热铝挤压中金属在长流道中的流动机理。实验是在实验室压力机中进行的，在较早的时候，通过让引入到坯料中的网格图案向下流入扼流模具通道中，以出现在通道壁附近。网格图案，然后透露，以表征在通道中的金属流动。建立了挤压过程的二维模型。将该模型应用于挤压实验条件的研究，获得了与实验较好的相似性。通过这种方式，已经获得了关于通过扼流模具通道的金属流动的新知识，例如;接触条件、粘附和滑动区的存在、滑动接触区中的摩擦条件以及通道横截面上的速度分布。
The mechanics of metal flow through long choked die channels have been investigated in unlubricated hot aluminum extrusion. Experiments were performed in a laboratory press at an earlier occasion by letting a grid pattern introduced into the billet flow down into the choked die channel to appear adjacent to the channel wall. The grid pattern was then revealed to characterize the metal flow in the channel. A 2D-model of the extrusion process was made. The model was applied to study the conditions in the extrusion experiments and in this model good similarity was obtained with the experiment. New knowledge regarding the metal flow through a choked die channel have been obtained this way, such as; contact conditions, presence of sticking and sliding zones, friction conditions in the sliding contact zone and the velocity profile over the cross-section of the channel.