论文部分内容阅读
将ECAP技术与传统正挤压工艺有机结合,提出了一种新型复合大塑性变形技术——等通道复合挤压(Equal Channel Angular Compound Extrusion,ECACE)。采用DEFORM-3D有限元技术,对纯铝在室温条件下ECACE变形过程进行了数值模拟,获得了挤压载荷、金属流动速度、等效应变等相关场量的变化规律。结果表明:ECACE工艺大致分为3个阶段,即挤压初始阶段、稳定挤压阶段、挤压终了阶段;金属流动速度心部大于外部,且在挤压模口附近金属质点的流速最快,约为3,58 mm/s;3个变形阶段的等效应变呈递增趋势,第Ⅲ阶段获得的累积应变量最大且稳定性最强,等效应变最大值约为26.2。
Based on the organic combination of ECAP technology and traditional extrusion process, a new composite plastic deformation technology (ECAP) was proposed. The DEFORM-3D finite element method was used to simulate the ECACE deformation of pure aluminum at room temperature. The variation of the relevant fields such as compressive load, metal flow velocity and equivalent strain were obtained. The results show that the ECACE process can be divided into three stages: initial stage of extrusion, stable stage of extrusion and final stage of extrusion. Metal flow velocity center is larger than the outer part, and the flow velocity of metal particles near the extrusion die is the fastest, About 3,58 mm / s. The equivalent strain in the three deformation stages showed an increasing trend. The accumulated strain obtained in the third stage was the largest and the most stable. The maximum equivalent strain was about 26.2.