Micro-stress combined machining method for aero-engine turbine disc mortise

Abstract

The invention relates to a micro-stress combined machining method for an aero-engine turbine disc mortise, which comprises the following steps of: firstly, carrying out linear cutting on a turbine disc blank (2) along a tooth crest datum line of the mortise to form a mortise with a reserved fine trimming size, then carrying out abrasive flow polishing on the mortise with the reserved fine trimming size, and finally, carrying out fine trimming on the mortise with the reserved fine trimming size, and obtaining the mortise with the preset size and surface roughness. According to the turbine disc mortise combined machining process, the machining precision is high, the broaching procedure is omitted, a broach is not needed, the machining cost is greatly reduced, meanwhile, linear cutting is stress-free machining, the problem that the final tenon tooth size is difficult to guarantee due to large stress generated during broaching is solved, and the machining size precision requirement of the turbine disc mortise is guaranteed. And meanwhile, a recast layer and a heat affected zone which are left on the surface of a workpiece through linear cutting machining are removed through abrasive particle flow, and the service life of the turbine disc is guaranteed.

Description

technical field [0001] The invention relates to a micro-stress composite machining method for a tenon and groove of a turbine disk of an aero-engine, and relates to the technical field of turbine disk machining. Background technique [0002] As the core component of the engine, the turbine disc is connected with the blade and the rotor through the mortise and tenon teeth in high temperature and high pressure operation. In order to ensure the working reliability of the turbine disc, the mortise and tenon teeth are required to have extremely high precision and reliability. mechanical properties. The broaching method is mostly used in the traditional turbine disk tenon and groove processing, but there are problems such as difficult design of the broach, time-consuming maintenance, and fast wear of the broach, which greatly increases the processing cost, and the broaching equipment used in the broaching process is basically imported. , and the price is expensive, and it is diff...

AI Technical Summary

Problems solved by technology

[0003] The present invention is designed to provide a micro-stress composite machining method for the tenon and groove of the turbine disc of an aero-engine just aiming at the above-mentioned prior art situation. The large stress generated during the process makes it difficult to guarantee the final tenon tooth size. The abrasive flow process is further used to remove the recast layer and heat-affected zone left by wire cutting, and finally ensure the dimensional accuracy and service life of the tenon and groove machining of the turbine disc. , At the same time, it improves the processing precision and reduces the processing cost

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