介绍了一种新型空心铝型材挤压模具即蝶形模的设计技术,蝶形模是将传统分流组合模的矩形分流桥设计成拱形,而且分流桥的中心部位较低,用来减少突破挤压力,改善金属的流动性。系统研究了蝶形模的主要结构及特点。列举了蝶形模在空心铝型材挤压中的一些应用实例,并与传统分流组合模进行了比较研究,通过对比表明:使用蝶形模可以有效降低挤压力,提高挤压速度,显著改善金属的成形性能,是一种高效的空心铝型材挤压成形技术。 This paper introduces the design technique of a new type of extrusion die for hollow aluminum extrusion, namely, butterfly die. The butterfly die is designed as an arch with a rectangular splitter bridge with a traditional split-flow modular die and has a lower central part of the shunt bridge to reduce the breakthrough Squeeze pressure to improve metal flow. The main structure and characteristics of the butterfly die are systematically studied. Some application examples of the butterfly die in hollow aluminum extrusion are listed and compared with the traditional split composite die. The comparison shows that the use of butterfly die can effectively reduce the extrusion pressure, improve the extrusion speed and improve significantly Metal forming performance, is an efficient hollow aluminum extrusion technology.