变径铝合金无缝管挤压工艺研究

Research on Extrusion Process of Variable Diameter Aluminum Alloy Seamless Tube

摘要: 论述了铝合金外变径、内变径和复合变径挤压的变形机理和运动过程。针对外变径和复合变径时，穿孔针容易出现断裂现象，通过Abaqus仿真模拟计算穿孔针和模具的受力情况，优化工模具参数和结构，穿孔针的选材采用3Cr2W8Vi等重载模具钢。同时，通过控制模型，实现了穿孔针的精确液压定针和准确变位功能，解决了铝合金变径管的应用和生产过程中的难题。

Abstract: The deformation mechanism and motion process of extrusion of aluminum alloy tubes with external diameter change, internal diameter change and composite diameter change are discussed. In view the fact that the punching needle is easy to break when the external diameter and composite diameter change, the force of the punching needle and the mold is calculated by Abaqus simulation and the process parameters and structure of the mold are optimized. The selection of materials for punching needle adopts heavy load die steel such as 3Cr2W8Vi. At the same time, the precise hydraulic locating and accurate shifting function of the punching needle are realized by controlling the model, and the difficult problems in the application and production process of aluminum alloy changing tubes are solved.