A Method for Electrolytic Machining of Non-uniform Double-rotating Integral Blisk Cascade Channels

Abstract

The invention discloses a non-uniform-speed double-rotation variable-machining-blade cathode blisk electrolytic machining method. The method comprises the following steps that a rotating feeding shaftof a tool cathode is determined through simulation solution; the rotation angles and the rotation speeds of the tool cathode at different positions are determined through simulation solution, and themotion track of the tool cathode simulation is obtained; the rotation direction, the rotation angle and the rotation speed of a blisk blank is determined through simulation solution; a machining blade of the tool cathode is designed to be a variable-width machining blade; the tool cathode is driven to perform one-way variable-speed rotating radial feeding from the tool setting position along therotating feeding shaft according to the motion track of the simulation by taking the twisting direction of a blisk design model blade profile as the rotation direction; and the blisk blank is driven to cooperate with the variable-direction variable-speed rotation of the tool cathode around the central axis according to the rotation direction, the rotation speed and the rotation angle of simulationoptimization, and a blade lattice channel is formed on the blisk blank. According to the method, the electrolytically-formed blade lattice channel is uniform in allowance distribution and high in surface machining quality, and precise electrolytic machining of the blade lattice channel of the blisk can be realized.

Description

technical field [0001] The invention belongs to the technical field of electrolytic machining, and in particular relates to an electrolytic machining method for non-uniform double-rotating integral blisk blade cascade passages. Background technique [0002] As the core component of the aerospace engine, the blisk has greatly improved the thrust-to-weight ratio and working efficiency of the aerospace engine. However, the blisk is widely used in some difficult-to-machine materials such as nickel-based superalloys and titanium alloys; Strict technical requirements such as precision and surface quality make the machining of the blisk very difficult. [0003] In the process of electrolytic machining, the tool electrode and the workpiece are not affected by the cutting force, so the electrolytic machining is not affected by the strength and hardness of the processed material, and the range of materials that can be processed is wide; and because there is no cutting force, the workp...

AI Technical Summary

Problems solved by technology

Although the existing various electrolytic machining devices and methods for the cascade channel of the overall blisk reduce the margin difference between the blade basin and the blade back of the cascade channel to a certain extent, due to the movement track between the tool cathode and the entire disk blank Due to single, simple tool cathode design and other reasons, the electrolytic machining of the blisk cascade channel is difficult to achieve semi-finishing or even finishing as the final process, and can only be selected as the initial step of the overall blisk machining

In addition, the processing edge of the tool cathode at the present stage is equal in width. During the electrolytic machining process of the overall blisk and cascade channel, the rotation of the entire disk blank will make the side profile of the blade basin of the cascade channel or the side profile of the blade back continuously approach the processing edge or edge of the blade basin. The blade back processing edge, on the contrary, the blade back side profile or blade pot side profile on the other side is constantly moving away from the blade back processing edge or blade pot processing edge, which will cause inconsistent clearance between the blade pot processing area of ​​the cascade passage and the blade back processing area , so that the erosion amount of the side profile of the blade pot processing area and the blade back processing area is inconsistent, resulting in a large difference in the allowance of the electrolytically formed cascade channel

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