Aluminum alloy has the advantages of high specific strength, good processing properties (such as weldability and pressure processing properties), strong corrosion resistance and excellent environmental performance (easy recycling), and has become a civil building and track. Important engineering materials in the fields of transportation, aerospace and shipbuilding.Complex multi-cavity aluminum profiles are representative of aluminum alloy extrusion products and have high difficulty in mold design and extrusion production.

At present, experience and analogy are still dominant in the design process of aluminum extrusion die. The trial process has a long cycle, high cost and low efficiency.In recent years, with the rapid development of computer simulation technology, numerical simulation technology can be used to intuitively analyze the temperature and speed changes during the extrusion process, which can effectively reduce the number of production trials, improve production efficiency, improve product quality, and promote aluminum profiles. The development of the extrusion industry is of great significance.

In this paper, for a complex multi-cavity aluminum profile, the extrusion process of the profile is simulated by numerical simulation technology, the velocity profile of the outlet profile is analyzed to optimize the die structure, and the actual die manufacturing and aluminum profile extrusion production are guided.