Nesting electrolytic machining fixture and method for blade trailing edge insoluble diffuser

Abstract

The invention discloses a trepanning electrolytic machining clamp for diffusers with insoluble blade trailing edges and a method thereof, and belongs to the field of electrolytic machining. The clampcomprises a left part and a right part, a cathode and an insulating block are located between a left clamp body and a right clamp body, a controllable liquid outlet gap is formed between the clamp bodies on two sides and the outer contour of the cathode, a liquid outlet corner type is used as the flowing way of electrolyte, the electrolyte flows in from the upper ends of blades and flows out fromthe liquid outlet gap, and a closed flow field is formed by the gap among an insulating sleeve, the cathode and the clamp. The insulating block is attached to the non-machining face of the cathode, sothat three-face machining of the leading edges, the concave surfaces and the convex surfaces of the blades is achieved. Concentric arc surfaces of leading and trailing edge supporting blocks are usedfor clamping annular workpieces. In the machining process, the adjacent machined blades are always sleeved with machined blade protecting sleeves, so that stray corrosion of the machined blades is effectively avoided. Through the trepanning electrolytic machining clamp and the method thereof, the problems of overlarge clamp pressure and electrolyte leakage easiness during diffuser trepanning electrolytic machining are solved, the stability of the flow field is improved easily, and machining quality is improved.

Description

technical field [0001] The invention discloses a jig and a method for electrolytic processing of casing materials for insoluble diffusers at blade trailing edges, which belong to the field of electrolytic processing, and in particular relate to the field of electrolytic processing of casing materials for aeroengine diffusers. Background technique [0002] Electrolytic machining technology is a method based on the principle of electrochemical anodic dissolution to etch the metal material of the workpiece to achieve the purpose of processing. It has many advantages such as wide processing range, good surface quality, high processing efficiency, no loss of cathode, and no residual stress of the workpiece. It has great advantages in the manufacture of parts with complex cutting materials and blade profiles, and is widely used in aviation, aerospace and other fields. [0003] Electrolytic machining electrolyte flow modes mainly include forward flow, reverse flow and lateral flow....

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Problems solved by technology

But since there is still electrolyte entering the machined surface from the gap between the insulating cavity and the machined area, the machined area is still affected by stray corrosion

[0006] In the patent "Electrolytic processing device and processing method for non-dissolving casing of blade trailing edge" (application number 201710880612.8 applicant Nanjing University of Aeronautics and Astronautics, inventor Zhu Dongxu Juewu Xu Zhengyang Zhu Di), a sealed casing electrolysis Processing fixture, the processing method of this invention can realize three-sided machining edge electrolytic machining, and can reduce the electrolyte leakage during processing, but because the fixture is a closed structure, the pressure on the fixture and the workpiece gradually increases during processing, to a certain extent It will affect the feeding of the workpiece, and even cause the workpiece to crawl in severe cases

[0007] Although the existing sealed sleeve electrolytic machining fixture can realize the processing of diffuser parts with the same cylindrical surface as the trailing edge of the blade and the outer circle of the hub, the device is complicated and the installation is difficult. In actual processing, short-circuit phenomenon is often prone to occur, and the flow field is uniform. Poor performance, which is not conducive to improving processing stability and processing accuracy; and the protection of the processed area cannot effectively reduce the stray corrosion suffered by the processed area

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