A. The specifications of various types of parts and structures vary greatly, and the generality of machine tools and other process equipment is not high. Such as the processing of fuselage structure requires the use of high rigidity, high efficiency, large-scale, high-speed machine tools, processing engine key parts require the use of precision and flexibility of high precision machine tools, processing of airborne equipment parts require the use of multi-functional composite machine tools.

B. Modern aviation manufacturing industry is usually faced with multi-species, small batch, short production cycle of the production task, so the process system is required to have a high response speed.

C. The structure of product parts is complex and difficult to process. The shape of the parts involves the fuselage shape, wing shape, wing and body fusion area, most of the parts are related to the aerodynamic shape of the aircraft, the peripheral contour and other parts and complex assembly coordination relationship.

D. The cutting and processing of parts is large. Due to the increasing use of overall structural design, making the number of parts requiring cutting and processing has increased dramatically, and most of the parts in the cutting process material removal is very large, some of the aircraft structural parts of the material removal rate of more than 90%.

E. Thin-walled, easy to produce machining deformation. There are a large number of thin-walled, deep cavity structure, a typical weak rigid structure.

F. High machining accuracy. Because of the need to realize the no-surplus assembly, the requirements for the process separation surface of the alignment of the seam, clearance, etc. are very strict, and the parts manufacturing precision is required to be high.

G. Difficulty in the selection of tools and cutting parameters. Due to the development of the tool industry can not catch up with the pace of development and application of new materials, and the lack of processing and cutting database support, so that how to reasonably select the tool and scientific selection of machining parameters has become a difficult point of technology.