Five-axis numerical control milling method for integral blade ring

Abstract

The invention provides an integral blade ring five-axis numerical control milling method, and belongs to the technical field of integral blade ring machining, and the integral blade ring five-axis numerical control milling method comprises the steps that an exhaust end upper flow channel area, an exhaust end lower flow channel area, an air inlet end upper flow channel area and an air inlet end lower flow channel area are divided by taking the middle position as a boundary; designing a layer milling cutter rail of each area; the layer milling cutter rails of the exhaust end upper flow channel area and the layer milling cutter rails of the exhaust end lower flow channel area are combined according to a certain proportion, the middle position of the grooving area serves as a lower cutter point, a cutter is at a negative angle, a layer is milled in the direction of the upper flow channel firstly, then a layer is milled in the direction of the lower flow channel, and the steps are repeated, so that grooving and milling of the exhaust end are completed; and combining the layer milling cutter rails in the upper runner area of the air inlet end and the layer milling cutter rails in the lower runner area of the air inlet end according to a certain proportion, and completing the slotting and milling of the air inlet end by the same steps as the slotting and milling steps of the air outlet end. The blade profile surface allowance is uniform, and cutter shaft vector milling does not need to be selected for many times.

Description

technical field [0001] The application relates to the technical field of integral blade ring processing, and in particular, to a five-axis numerical control milling method for an integral blade ring. Background technique [0002] The integral blade ring is a key part of the new integral structure adopted by advanced aero-engines, and is an important component of aero-engines. Compared with traditional blade ring parts, the overall blade ring is light in weight, good in reliability and long in life, so it is widely used in high-pressure compressor rectifiers for advanced turbofan engines. Since the integral blade ring is a key aerospace part serving under extreme environmental conditions (high temperature, high pressure, strong impact), high-strength and heat-resistant materials are used, the blade shape is complex, the flow channel space is narrow, and it is difficult for machining tools to reach the machined surface. Poor accessibility, serious problems in tool connection ...

AI Technical Summary

Problems solved by technology

[0004] 1) During rough machining, an end mill is used for fixed-axis roughing. Due to the small gap between the blades of the overall leaf ring, the blades are relatively twisted, and the size of the tool is limited, resulting in uneven removal of the margin at the R of the blade profile. Larger; it does not meet the process requirements of 0.4-0.6mm margin; because the airfoil itself is a relatively twisted surface, the fixed axis milling of the end mill cannot be processed completely according to the curvature of the airfoil, and the accessibility of the tool is poor, and the surface of the airfoil The luminosity is poor, and the roughness cannot meet the requirements;

[0005] 2) The blade has a twisted surface, the blade is thin, and the blade rigidity is poor. The end mill is used for fixed axis roughing to remove a large margin. The cutting force acting on the blade body surface is too large, which can easily cause deformation and tremor of the part. Semi-finishing Milling cannot completely remove the rough marks, and the surface gloss of the parts is poor;

[0006] 3) The distribution of the allowance is uneven, and the residual amount of the transfer fillet at the leaf basin is too large, resulting in excessive semi-finishing cutting, full cutting of the tool, and reduced service life; it will also lead to uneven stress distribution of the parts themselves, Affects the subsequent stress relief heat treatment process, resulting in incomplete stress release of the parts, thereby increasing the deformation of the parts themselves and increasing the difficulty for subsequent machining

[0007] Therefore, traditional mechanical processing methods are no longer competent, and new processing techniques must be explored

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