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Friction-assisted pressing of PM components

机译:摩擦辅助压制PM组件

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Friction between powder and tools plays a major role during cold compaction of PM components with results on the inhomogeneous densification present work deals with a new method of compaction for PM components by using the friction force between die and compacts as an active pressing force in order to reduce the density gradient. The proposal technique consists in moving the container of the die, during pressing stage to the punch direction according of a particularly speed. As a result, the friction force acts in the same sense as the pressing load with better distribution of powder flow during compaction. The experimental results of compaction parameters versus density, for Al and 316L stainless steel across the height of cylindrical specimens, have proved the decreasing of the density gradient by Increasing container/punch speed rate, even for high and low h/d geometrical factor. A sharp density gradient on the specimen height moving container contrarily to the punch.
机译:粉末和工具之间的摩擦在PM组件的冷压制过程中起主要作用,其结果是不均匀致密化。目前的工作是通过利用模具和压坯之间的摩擦力作为主动压力来处理PM组件的一种新的压紧方法。降低密度梯度。提出的技术在于在压制阶段期间根据特别的速度将模具的容器移动到冲压方向。结果,摩擦力的作用与压紧载荷相同,压实过程中粉末流分布更均匀。对于Al和316L不锈钢在整个圆柱形试样高度上的压实参数与密度的实验结果证明,即使对于高/低h / d几何因子,通过增加容器/冲压速度也可以减小密度梯度。与冲头相反,样品高度移动容器上的密度梯度很大。

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