FABRICATION OF FUNCTIONAL COMPOSITE PLATES AND IRREGULAR SHAPE PARTS BY DIFFERENTIAL SPEED ROLLING

在严格控制进给量的条件下，对一种电解铜粉进行了差速轧制。通过选择轧辊转数或轧辊直径的组合，轧辊速比在1.00到1.50的范围内变化。轧制负荷随着给粉量与带钢速度之比的增加而增加。无论轧辊速比如何，带钢厚度随轧制负荷的增加而增加。带钢的相对密度比常规轧制的密度大。利用粉末压实力学分析了粉末的差速轧制，并提出了采用常规或差速轧制的速度场。得到了带钢的厚度、密度和轧制载荷。结合轧机弹簧，利用电解铜粉可以预测轧制厚度和轧制负荷。预测结果与上述实验结果吻合较好。将上述结果应用于复合板、功能异形板或机械零件的制作。通过对轧制速度的选择，实现了不锈钢和电解铜粉冲孔板的同步轧制。具有高强度和低热阻的复合板或不规则形状的功能机械零件易于制造。

Differential speed rolling of an electrolytic copper powder was conducted under conditions of carefully controlled powder feed volume. Roll speed ratios are changed in the range from 1.00 to 1.50 by choosing roll revolutions or combinations of roll diameters. The rolling load increases with an increase in the ratio of the powder feed volume to the strip speed. The strip thickness increases with increasing the rolling load for each roll gap regardless of the roll speed ratio. The relative density of the strip is grater than that achieved by conventional rolling.Differential speed rolling of powder was analyzed using the mechanics of powder compacting and a proposed velocity field utilizing for conventional or differential speed rolling of the powder. The thickness and density of the strips and the rolling load were obtained. Combined with the mill spring, it is possible to predict the thickness and rolling load using the electrolytic copper powder. The predicted results agree well with the above experimental results obtained.The above mentioned results were applied to make a composite plate and functional irregular plate or machine parts. Simultaneous rolling of a punching plate made of stainless steel and an electrolytic copper powder was conducted by choosing the roll speeds. The composite plate with a high strength and a low thermal resistance or the functional machine parts with an irregular shape was easily fabricated.