An inner cavity variable tool cathode for electrolytic machining of large twisted blade integral blisks

Abstract

A tool cathode with a variable inner cavity and used for performing electrolytic machining on a blisk with a big-twisted blade. According to the cathode structure, several linkages are combined to form the shape of the cross-section on the bottom of a blade. Telescopic linkages (31, 32, 33, 34, 35, 36) are provided on a part of the section, and are provided in a cathode housing (2). The cathode housing (2) is fixed on a cathode fixture (1). Several rotary bases (13) are provided on both sides of the cathode fixture. Electric push rods (4) are disposed on the bases. Probes (41) at the tail end of the electric push rods (4) are provided at the positions where cathode linkages are connected. During machining, a fixture drive shaft drives the cathode fixture, the cathode housing, and the inner cathode linkages for synchronous rotation and feed. At the same time, the electric push rod drives the cathode linkage to move to realize the change in the shape of the inner cavity of the cathode. The problem due to the difficulty in processing a blisk blade with a large-twist variable cross-section by the conventional nesting electrolytic machining, radial forming electrolytic machining, and numerical control generation electrolytic machining is solved in order to allow a processed blade profile to be close to a target blade profile to the greatest extent, and to efficiently reduce the levelling surplus.

Description

technical field [0001] The patent of the present invention relates to a cathode device structural design for electrolytic machining of variable cross-section and large twisted integral blisk blades, and belongs to the technical field of integral blisk electrolytic machining. Background technique [0002] Aerospace technology has now become one of the important indicators to measure a country's scientific and technological level and comprehensive national strength. The blisk is the core component of an aero-engine, and its high-efficiency and high-quality manufacturing methods have also become the key to the development of aero-engines. technology. With the continuous improvement of the thrust of aero-engines, the material of the blisk is also constantly transitioning to the direction of high strength, high hardness, and high temperature resistance such as titanium alloy, making the processing of the blisk a major problem in the manufacturing industry. Compared with traditio...

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Problems solved by technology

Nesting electrolytic machining can only process blisk blades with equal cross-sections; radial forming electrolytic machining belongs to the pre-processing of the cascade channel, and the movement mode of the cathode is a single radial feed or spiral feed, which is suitable for blades with a large degree of distortion. The whole blisk will cause the problem of uneven distribution of blade finishing allowance, or even the problem that it cannot be processed; the movement track of the cathode of the numerical control generated electrolytic machining tool is a straight-grained developable surface, and it is impossible to process the blisk blade with twisted and complex shapes

Aiming at the problem that the existing electrolytic machining technology is difficult to process the blisk with large twist and variable cross-section, it is imperative to study a new cathode device and method for electrolytic machining

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