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Reducing tube through three-roll dies with stretching mandrel

机译：带有拉伸芯棒的三辊模具缩径管

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摘要

The authors have developed a new technique of reducing tube through three-roll dies with a stretching mandrel. Compared with a conventional die drawing method, the conditions of friction, velocity and deformation have altered in the deformation zone. This new technique is claimed to decrease power consumption and the friction between metal and tool, simplify the process and omit lubrication. In the seamless tube reducing process, the main method used is conventional die drawing. Because of the high tube deformation resistance in cold forming and the large relative slip occurring not only between metal and dies but also between metal and mandrel, the positive forces between metal and dies/metal and mandrel are so high that the friction between metal and tool surface is great.
机译：作者已经开发出一种新技术，可通过带有拉伸心轴的三辊模具减少管材。与传统的模具拉伸方法相比，变形区的摩擦，速度和变形条件发生了变化。这项新技术据称可减少功耗和金属与工具之间的摩擦，简化工艺并省略润滑。在无缝管缩径工艺中，使用的主要方法是常规的模具拉伸。由于冷成形中的高变形抗力以及不仅在金属与模具之间而且在金属与心轴之间发生较大的相对滑动，金属与模具/金属与心轴之间的正向力如此之高，以至于金属与工具之间的摩擦力很大表面很棒。

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