An integral inner cavity screw feed electrolytic machining fixture

Abstract

The invention discloses an overall inner cavity screw feed electrolytic machining fixture, and belongs to the field of electrolytic machining. The device comprises a base, an upper sealing cover, an electrode head, a cathode rod, a diversion block and a sealing device. An annular sealing ring is arranged on the contacted surface of a blade disc blank with the base and the upper sealing cover; an upper cover plate and a fixture body are connected through a stud and a butterfly-shaped nut; a sealing filler is filled between the electrode rod and a sealing nut; and the blade disc blank is positioned and clamped on the fixture body by a pin and a screw. During machining, an electrode axially performs a spiral motion; and meanwhile, the diversion block synchronously performs linear feeding along with the electrode. The overall inner cavity screw feed electrolytic machining fixture solves the difficulties of electrolyte leakage and flowing field turbulence in screw feed electrolytic machining of a blade disc cascade channel, and is suitable for electrolytic machining of aviation engine blade discs and similar parts.

Description

technical field [0001] The invention discloses a fixture for electrolytic processing of integral inner chamber spiral feed, which belongs to the field of electrolytic processing of integral blisks, and in particular relates to the field of electrolytic processing of integral blisks of aeroengines with spiral feed. Background technique [0002] With the rapid development of the aviation industry, more and more attention has been paid to the research and development of the aero-engine as the heart of the aircraft, and the thrust-to-weight ratio is one of the important indicators for evaluating the performance of the engine. In order to reduce the structural weight and the number of parts of the engine, the overall components have been improved more and more widely used. As the core component of the aero-engine, the integral blisk eliminates the traditional locking plate and tongue-and-groove connection, and combines the blade and the disc into one, reducing the original blisk ...

AI Technical Summary

Problems solved by technology

Nesting electric machining is only limited to the processing of the overall blisk of blades with equal cross-sections, and cannot process the overall blisks of distorted blades with variable cross-sections

Profiling electrolytic machining is suitable for processing straight-grained and twisted profiles, but this technology processes a blisk corresponding to a specific profiling fixture and pattern, which has poor versatility, long production cycle preparation, and processing flexibility.

NC electrolytic machining is a processing method that combines electrolytic machining technology with computer numerical control technology, but it is limited to machining blisks with straight grain and developable surfaces, and its tool electrode adopts a hollow and thin-walled structure. Easy to deform under washing

Radial electrolytic machining adopts a linearly movable forming cathode, which has high forming precision, but it is only suitable for machining the open cascade channel, and it is difficult to process the complex and twisted cascade channel

The Chinese invention patent with the patent application number 201410013249.6 discloses an integral blisk electrolytic machining tool capable of linear and rotary combined feed, which consists of a clamp body, a drainage cover body, and a cathode body, which solves the problem of electrolyte flow field in principle. Disturbance, and the problem of follow-up sealing, make it possible to feed the molded cathode radially, but its cylindrical inner cavity is composed of two semi-cylindrical surfaces on the upper cover of the clamp body and the base of the clamp body, and the clamp body and blade The disk and the cathode are in rigid contact. Under high pressure conditions, electrolyte leakage will occur, resulting in a lack of liquid in the internal electrolyte flow field, and the inner cavity shape of the follow-up drainage cover is more complicated and difficult to process. large, poor applicability

Therefore, there is an urgent need to find a fixture that can meet the needs of linear and rotary combined feed electrolytic machining, so that it can meet the problems of follow-up sealing and electrolyte flow field turbulence during tool electrode feeding. At the same time, the device should also have good Versatility

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