Gas-assisted protection integral impeller trepanning electrolytic machining process and device

Abstract

The invention discloses an integral impeller trepanning electrolytic machining process and device with a gas-assisted protection function, and belongs to the field of electrolytic machining. The upper part of the device is provided with a cylindrical cathode seat which is in clamping connection with a main shaft, and the bottom of the cylindrical cathode seat is provided with a pin hole so as to realize the positioning of a cathode; a vent hole is formed in the middle of the device and used for conducting gas-assisted insulation on a machined blade and a blade to be machined. An insulation sealing device is arranged on the lower portion of the device, and the insulation sealing device and the front blade insulation sleeve and the rear blade insulation sleeve inside the device form a closed machining area to achieve closing of an electrolytic machining flow field. In the machining process, the blade sleeved with the blade insulation sleeve is always in the gas auxiliary insulation state, and the stray corrosion degree of the machined blade is effectively reduced. The method solves the problems that the machined blade is subjected to stray corrosion and the flow field open type electrolyte remains in a non-machining area during the trepanning electrolytic machining of the uniform-section blade type integral impeller, and is beneficial to improving the machining precision of the blade and enhancing the stability of the machining process.

Description

technical field [0001] The invention relates to the technical field of special processing, in particular to a gas-assisted protective integral impeller casing electrolytic processing process and device. Background technique [0002] The constant-section blade-type integral impeller is an integral component with complex curved surface, which is widely used in turbofan engines, compressor rotors and high- and low-pressure turbines in the aerospace field. The integral component has the advantages of light weight, high fatigue strength, and compact structure. [0003] The processing methods of integral impellers with equal cross-section blades include electric discharge machining, precision casting, numerical control milling, linear friction welding, and nesting electrolytic machining. If EDM technology is used to process the overall impeller with equal cross-section blade shape, micro-cracks and recast layers will appear on the surface of the impeller to varying degrees, which...

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Problems solved by technology

[0007] The purpose of the present invention is to provide a gas-assisted protective integral impeller casing electrolytic process to solve the problems that the blades cannot be fully insulated and the open flow field is unstable during electrolytic processing of equal-section blades at the present stage. Processing technology and devices to improve the processing accuracy, processing stability and life of the machine tool of the integral impeller of equal section blade shape

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