导流角对挤压变形流动的影响机理分析

针对平模挤压时常因金属流速不均匀而易产生缺陷,本文采用了带导流角结构的芯模进行挤压研究.通过数值模拟和实验,深入分析了挤压过程中金属变形流动行为的机理,结果表明:带导流角芯模挤压时筒底不出现分流的现象,"死区"显著地缩小;处于塑性区内材料的应变类型由三种变为均一的拉伸类,显著地提高了金属变形流动的均匀性,利于金属的挤出成形及制品质量的提高.

Effects and the Mechanism of Guiding Angle on metal flow in Extrusion

To avoid non-uniform metal flow in conventional extrusion process,a guiding angle was designed. The mechanism of metal flow was studied during extrusion deformation based on both numerical simulation and experiment. It is indicated that when with a guiding angle,the dead metal zone remarkably dwindle,the deformation typed of the metal on plastic deformation area changed from three types to a type of tension,and the homogeneity of the deformation as well as metal flow are greatly improved,which will be helpf...