Typical case and process selection of high precision machining in aerospace field

In the field of processing aerospace engine with a blade crown integrated turbine disk, due to the complex shape of such turbine disk blades, the minimum channel between the blades is only a few millimeters. Although the numerical control milling process has certain flexibility, the cutting tool interferes with the blade phenomenon. Processing cannot be achieved. So far, the multi-axis linkage precision CNC EDM technology is the most feasible method to realize the machining of the rotor blade with the blade crown integral turbine disk.

For the micro-structures such as integrated circuit molds and nozzles of injectors, the general design technical requirements: 1 has a good shape. Type 2 face or hole edge should be free of burrs. 3 holes should be kept sharp. The in-plane or micropore inner surface of the type 4 maintains a good surface quality. For such requirements, especially for micropores with sharp edges and no burrs and diameters less than 0.1 mm, high-speed milling is simply not possible. Compared with the traditional machining methods, the micro-CNC EDM technology has the advantages of non-contact, strong maneuverability, no dependence on material hardness and strength, no cutting force, etc. It is especially suitable for high hardness and high hardness that is difficult for mechanical cutting. Processing of difficult-to-machine metal materials such as strength, high melting point, high toughness, and high brittleness. At the same time, it has the advantages that other processing methods are incomparable in the processing of micro-axis, micro-hole and micro-three-dimensional structure, and has strong micro-scale manufacturing capability, which has received widespread attention at home and abroad.

CNC electric spark can process materials and complex shape workpieces that are difficult to machine by ordinary cutting methods; no cutting force during machining; no defects such as burrs and knife marks; tool electrode materials do not need to be harder than workpiece materials; Automated; the surface is deformed after processing, and needs to be further removed in some applications; the treatment of smog pollution generated in the purification and processing of working fluid is troublesome.

In general process selection, high-speed milling is used to remove the margin, and finally CNC machining is used for finishing, which can greatly improve the processing efficiency and reduce the cost.