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Analysis of metal flow of aluminum through long choked die channels

机译：通过长呼吸模具通道分析铝金属流动

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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.
机译：在非悬浮的热铝挤出中研究了通过长呼吸模具通道的金属流量的机制。通过使引入坯料流入的栅格图案流入呼吸模道，在实验室压力机中进行实验在实验室压力机中进行，以邻近通道壁。然后显示网格图案以表征通道中的金属流动。制造了2D模型的挤出过程。应用模型以研究挤出实验中的条件，并在这种模型中获得良好的相似性。通过这种方式获得了通过Choked模频通道的金属流动的新知识，例如;接触条件，存在粘附和滑动区域的存在，滑动接触区域中的摩擦条件和通道横截面上的速度曲线。

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