等通道转角挤压模具探讨与展望

Discussion and Future Expectation on the Die Structures for Equal Channel Angular Pressing

等通道转角挤压是能够获得块状超细晶组织的一种新的材料加工方法。其工艺和模具结构有他自身的特点。模具结构的合理设计对改善材料变形均匀性,增强晶粒细化效果,节省加工成本,优化工艺等有着较为重要的作用。本文对各种不同结构的等通道转角挤压模具进行了较为详细地评述,着重探讨了单转角模具的结构特点,尤其是方形通道模具各结构参数之间的关系。并总结了目前模具发展中存在的不足和未来的发展趋势,为工艺优化和模具设计提供了重要的参考依据。

Equal channel angular pressing(ECAP) is a promising technology for producing bulk ultra-fine grained(UFG) materials. The process and die structure are of its own characteristics. Reasonable die structure plays important role in developing uniformity of deformation, enhancing effectiveness of UFG production, reducing the cost of process, optimizing the process and so on. In this paper, the various ECAP dies are introduced in detail, especially, one-angle die structure characteristics and the relation among structure parameters of square channel are emphasized. The deficiency and further application prospects of the ECAP die also are discussed. which has a significant contribution to the optimization of the technology and die design.