Device and method for removing re-melting layers on inner walls of air film holes of blades

Abstract

The invention provides a device and method for removing re-melting layers on inner walls of air film holes of blades. In the invention, the re-melting layers on the inner walls of the air film holes of the blades are uniformly removed by adopting an electrolyte-plasma machining technology. The device is characterized by comprising a direct-current (DC) power supply, a control system, a temperature control system, a filter system and a hydraulic system. The invention has the beneficial effects that the inner walls of the air film holes of the blades are processed with high-pressure internal flushing electrolyte in a non-immersion manner so as to effectively remove the re-melting layers of micro-holes; the device and method provided by the invention are convenient for implementation, achieve the effects of uniform allowance, no re-melting layer residue and high dimensional precision, have high operating efficiency improved by dozens of times as compared with an abrasive flow method, greatly enhance the air film cooling effect and prolong the service life of the blades.

Description

technical field [0001] The invention belongs to the technical field of electrical machining, and relates to a device and a process method for removing a remelted layer on the inner wall of a gas film hole of an aeroengine turbine blade. Background technique [0002] Turbine blades are the key components of aero-engines. In order to improve the performance of the engine, multiple rows of cooling air film holes with different apertures are distributed along the blade body of the turbine blades. At present, high-speed EDM drilling and laser drilling are commonly used for processing. These processing methods will produce a remelted layer on the inner wall of the gas film hole that affects the quality of the blade. At present, abrasive flow and other methods are mostly used to remove the remelted layer at home and abroad. The processing efficiency is low, the cost is high, the margin is not uniformly removed, and there is a residual remelted layer; And other reasons, it is easy ...

AI Technical Summary

Problems solved by technology

At present, abrasive flow and other methods are mostly used at home and abroad to remove the remelted layer, which has low processing efficiency, high cost, uneven removal of the margin and residual remelted layer; it is found in the test that the blade with the residual remelted layer is due to vibration fatigue. and other reasons, it is easy to form microcracks and cause fracture failure, which seriously affects the safety of the engine

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