High-efficiency precision milling method for aeroengine blade airfoil profile

Abstract

The invention relates to a high-efficient fine-milling machining method for a blade body molded surface of an aviation engine. The high-efficient fine-milling machining method for the blade body molded surface of the aviation engine is characterized by comprising the steps of drawing an equal-step rough milling cutter rail on a workblank molded surface three-dimensional model obtained through reconstruction, adopting a self-adaption variable feed processing method based on a constant cutting load for calculating a rough milling feed rate of a cutter at each cutter location point, and rough milling the blade body molded surface through a variable feed manner; and then drawing an equal-step fine-milling cutter rail on a rigid three-dimensional model, adopting a self-adaption variable feed method based on a molded surface normal-direction constant elastic deformation for calculating a fine-milling feed rate of the cutter at each cutter location point of the fine-milling cutter rail, and fine-milling the blade body molded surface through the variable feed manner. According to the high-efficient fine-milling machining method for the blade body molded surface of the aviation engine provided by the invention, the rough milling efficiency and the fine-milling machining efficiency of the blade body molded surface are remarkably improved, an effect improvement effect on machining products in batch is particularly remarkable, the cutter back-off for machining weak-rigidity blades is effectively avoided, and the machining surface quality is improved.

Description

technical field [0001] The invention relates to a technology in the field of aircraft manufacturing, in particular to a high-efficiency precision milling method for an aeroengine blade airfoil profile. Background technique [0002] Aeroengine blade airfoil profile is usually a free-form surface, and the airfoil is very thin, especially in weakly rigid areas such as the inlet and outlet air edges, which are prone to flutter during cutting. At the same time, the dimensional accuracy and surface roughness of the blade are required to be high, so It is a typical difficult-to-machine structural part. Because the blades of aero-engines work under high-temperature and high-frequency loads for a long time, and the service environment is extremely harsh, titanium alloys are usually used as blade materials because of their low elastic modulus, poor thermal conductivity, high chemical activity, high strength, and severe work hardening. It is recognized as a difficult-to-machine materi...

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Problems solved by technology

[0004] The present invention aims at the rough milling of die-forging blade airfoil profile in the prior art, which causes the tool to have a large load change when the tool moves at a constant feed rate due to uneven surface allowance, and the resulting low tool life, The problem of low rough milling efficiency, and in the fine milling process of the airfoil profile, due to the large difference in rigidity at different positions of the twisted airfoil profile, the blade body weak rigidity area is prone to occur when the tool is cutting at a constant feed rate In order to solve the problem of low cutting efficiency in the cutting tool and strong rigid area, a high-efficiency precision milling method for the airfoil profile of the aero-engine blade is proposed, which significantly improves the efficiency of rough milling and fine milling of the airfoil profile of the blade, and is beneficial to batch processed products. The effect of improving efficiency is particularly significant; effectively avoiding the processing of weakly rigid blades, improving the quality of the processed surface

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