微型铜圆柱体镦粗实验研究

为了找出微小尺度下材料流动及流动应力等的新特点及为微成形工艺设计、模具设计提供相关数据，在常温下以不同变形速度和变形量进行了微小尺度下圆柱体镦粗实验。结果表明，材料流动呈现出各向异性，且随压下量增大而明显；屈服应力降低，出现较大波动；流动应力出现明显波动；变形速度对材料流动、屈服应力、流动应力没有明显影响。本研究对于微成形技术的实用化具有一定意义。

The Upsetting Test in Micro Scale

In order to obtain the new characteristics of material flow and flow stress etc,as well as provide the relevant data for the design of process and mold in microforming,the micro scale cylinder upsetting test has been done with different speed and stroke in room temperature,Resulting in that in micro dimension,the material flow was anisotropic and the anisotropy more severe with the increase of stroke;the yield stress was decreased and fluctuated severely;the flow stress was obviously fluctuant;the material flow, yield stress and flow stress were not apparently influenced by the deforming speed.It may have some practical meanings to microforming.