Method for composite machining of blisk flow passage

Abstract

The invention belongs to the technical field of aircraft engines, and discloses a method for the composite machining of a blisk flow passage. The method is a numerical control machining method of selecting the adaptive machining strategy based on regional characteristics. The method comprises the following steps of: (1) dividing a machining region; and (2) selecting the adaptive numerical control machining strategy based on the regional characteristics. In the method, a rough slotting numerical control machining method of combining milling, drilling milling and slotting milling of a cycloid is adopted, so that a medial cambered surface is approximate to a curved surface of a blade profile, and the boundary contour and the optimal cutter-axis vector of a rough machining region in a channel are determined. The method has the advantages that the machining method of region division and cutting-in changing enhances the rigidity and machining stability of blades; a process method of combining the milling and slotting milling of the cycloid improves the durability of cutters and the removal rate of materials; and the vibration phenomenon in the rough machining process is prevented effectively, the cutting force is reduced, the movement space of the cutters is expanded farthest, and the machining efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of aero-engines, and is a numerically controlled machining method based on regional characteristics to select an adaptive machining strategy, which can be used for the processing of industrial products such as blisks and impellers, and particularly relates to a method for composite processing of flow channels of blisks . Background technique [0002] The processing of blisk parts from forging blanks to final parts requires removal of a large amount of excess material. The flow passage area of ​​the blisk is composed of free-form surfaces in space, and the blade space in the flow passage area is narrow, and the rigidity of the blade is poor. In the past, the blisk used the conventional method of full-blade slot milling, which caused serious tool wear, poor processing conditions, and poor milling depth. (Ap) cannot exceed half of the diameter of the milling cutter at most. Due to the complex structure of the ...

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Problems solved by technology

The flow passage area of ​​the blisk is composed of free-form surfaces in space, and the blade space in the flow passage area is narrow, and the rigidity of the blade is poor. In the past, the blisk used the conventional method of full-blade slot milling, which caused serious tool wear, poor processing conditions, and poor milling depth. (Ap) can not exceed half of the diameter of the milling cutter. Due to the complex structure of the flow passage area of ​​the blisk parts and the sharp change of the cutter axis, the multi-axis linkage processing method has to be adopted, and the processing process is not suitable for control

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