1 文氏管零件特征及加工难度某飞机文氏管(材料为1Cr18Ni9Ti)是飞机环控系统中的一个重要零件,其两头大、中间小,两端内孔面积是喉部内孔面积的8.5倍,如图1所示。喉部尺寸的变化直接影响系统的压力,要求精度高,成形难度大。由于图纸规定的是管材成形件,采用常规工艺加工困难,产品质量难以保证。因此,文氏管的成形是一个技术关键。 1 Venturi parts features and processing difficulty An aircraft Venturi (material 1Cr18Ni9Ti) is an important part of the aircraft loop control system, the two large, middle small, both ends of the inner bore area is 8.5 times the inner throat area ,As shown in Figure 1. Throat size changes directly affect the system pressure, high precision, forming difficult. As the provisions of the drawings are pipe forming parts, the use of conventional processing difficulties, difficult to guarantee the quality of the product. Therefore, the formation of venturi is a key technology.