Electric spark processing method for sealing grooves of aero engine guide vane

Abstract

This invention provides an electric spark processing method for sealing grooves of an aero engine guide vane. The method comprises the following steps: (1) two copper-tungsten alloy blocks are fixed on an electrode pedestal and are processed into two electrodes by adopting a milling mode, wherein the two electrodes have the shapes same as and the positions matching with those of the sealing grooves, formed in large and small margin plates of the guide vane, to be processed respectively; and (2) the two electrodes are placed aligning to the parts, to be processed, of big and small margin plates of the guide vane respectively, an electric spark processing machine is started to ensure that the two electrodes carries out electric spark processing on the parts to be processed in the depth direction of the sealing grooves; the two electrodes are aligned to a next part to be processed after processing of the sealing groove of the processed surface is finished, and processing continues according to the process conditions until all the sealing grooves, in the same type, formed in the guide vane are processed; and after the electrodes wears, the two copper-tungsten alloy blocks which are fixed on the electrode pedestal are reprocessed into electrodes by using the milling mode, and then the sealing grooves are continuously processed.

Description

technical field [0001] The invention belongs to the technical field of manufacturing guide blades of aero-engines, in particular to an electric spark machining method for sealing grooves of guide blades of aero-engines. Background technique [0002] The guide vane is the part that bears the most high temperature and thermal shock in the aero-engine components, and its working conditions are very harsh. In addition to being subjected to large aerodynamic work and unstable pulsating load, the guide vane is also surrounded by high-temperature gas. The temperature of the working environment is high and the temperature changes greatly, and the heating of the guide vane is seriously uneven. Because superalloys have excellent high-temperature strength and hardness, they are often used as the first choice for making guide vanes. [0003] In order to reduce air leakage loss of aero-engines and improve the sealing effect, it is necessary to process sealing grooves on the guide vanes....

AI Technical Summary

Problems solved by technology

Since the electrode is made of red copper, it wears out quickly during the processing process. On average, a new electrode needs to be replaced every time a guide vane is processed. Due to the high requirements for the processing position and processing accuracy of the sealing groove, the assembly accuracy of the electrode is required. Very high, and frequent electrode replacement is difficult to ensure that the relative position of the electrode and the electrode base is consistent during each assembly, which will easily cause fluctuations in the electrode position, which in turn makes it difficult to ensure the position of the sealing groove

Moreover, the processing of the sealing grooves on the large and small edge plates separately still has the problem of low processing efficiency

At the same time, because the electrode is made of red copper and is in a thin sheet shape, there is a problem of insufficient strength. During the processing of the sealing groove, the electrode is easily deformed, which affects the processing accuracy, and the processing pass rate of the sealing groove is extremely low.

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