Combined processing-type electrode used for machining sealing grooves of aero-engine guide blades

Abstract

The invention provides a combined processing-type electrode used for machining sealing grooves of aero-engine guide blades. The combined processing-type electrode comprises an electrode body, an electrode base, a clamping head, a first copper-tungsten alloy block, a second copper-tungsten alloy block, first electrode bodies and second electrode bodies. The first electrode bodies are located at the end of the first copper-tungsten alloy block and integrated with the first copper-tungsten alloy block. The second electrode bodies are located at the end of the second copper-tungsten alloy block and integrated with the second copper-tungsten alloy block. The first copper-tungsten alloy block and the second copper-tungsten alloy block are fixed to the two ends of the bottom surface of the electrode base respectively. The shapes of the first electrode bodies and the shapes of the second electrode bodies are consistent with the shapes of sealing grooves to be machined in large margin plates of the guide blades and the shapes of sealing grooves to be machined in small margin plates of the guide blades respectively, and the positions of the first electrode bodies and the positions of the second electrode bodies are matched with the positions of the sealing grooves to be machined in the large margin plates of the guide blades and the positions of the sealing grooves to be machined in the small margin plates of the guide blades respectively. The clamping head comprises a main shaft connecting part and a base connecting part, wherein the shape of the main shaft connecting part is matched with a main shaft head of an electro-discharge machine tool, and the base connecting part is provided with a threaded hole. The main shaft connecting part penetrates through a clamping head installing through hole formed in the electrode base, and the base connecting part is in threaded connection with the electrode base.

Description

technical field [0001] The invention belongs to the technical field of manufacturing guide vanes of aero-engines, and in particular relates to a combined processing electrode used for machining sealing grooves of guide vanes 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. In order to reduce the air leakage loss of the aero-engine and improve the sealing effect, it is necessary to process sealing grooves on the guide vanes. The sealing grooves are respectively distributed on the large and small edge plates of the guide vanes. Due to the dee...

AI Technical Summary

Problems solved by technology

Since the processing electrodes of the sealing grooves of the large and small edge plates are in the shape of thin sheets and made of red copper, the wear and tear in the process of processing is very fast. On average, a new electrode needs to be replaced every time a guide vane is processed. Due to the processing position of the sealing groove High precision and machining accuracy are required, so the assembly accuracy of the electrode is very high, and it is difficult to ensure that the relative position of the electrode and the electrode base is consistent during each assembly when the electrode is frequently replaced, which will easily cause fluctuations in the position of the electrode, which in turn will lead to the position of the sealing groove degree is difficult to guarantee

Moreover, the separate processing of the sealing grooves on the large and small edge plates also 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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