Large-distortion blade precise electrolytic machining device and process method

Abstract

The invention relates to a large-distortion blade precise electrolytic machining device and a process method. The device comprises a cathode positioning and clamping device, a workpiece quick-changingdevice and an electrolyte flow guiding device. According to the large-distortion blade precise electrolytic machining device and the process method, a fully-closed electrolytic machining tool clamp is adopted, the cathode design is integrated, and a composite flow guiding segment combined with a metal segment and an insulating segment arranged on a blade basin cathode and a blade rear cathode arecombined, so that a flow field in the machining process is stable; the workpeice space pose is optimized through a particle swarm algorithm, and the optimal feeding angle can be achieved only feedingthe blade basin cathode and the blade rear cathode in an opposite-linear mode, so that the electrolytic forming precision is improved. According to the method, the high-precision of blade space positioning can be ensured; and meanwhile, quick workpiece changing can be realized by means of a quick-change reference element arranged on a fully-closed tool, and one-time clamping can be achieved to complete the integral forming of a blade basin surface, a blade rear surface and inlet and exhaust edges, and the purpose of improving the machining precision and machining efficiency of a blade can beachieved.

Description

technical field [0001] The invention relates to the technical field of numerical control electrolytic machining, in particular to a precision electrolytic machining device and a process method for large twisted blades. Background technique [0002] Electrolytic machining is based on the principle of anodic dissolution and removal of materials. It has the advantages of no loss of tool cathode, good surface quality, no residual stress, no limitation of material hardness, and all conductive materials can be processed. Under the condition of ensuring reasonable process regulations, electrolytic machining The technology can obtain better surface quality and machining accuracy, especially the unique advantages in processing difficult-to-machine materials, making it widely used in the manufacture of aviation and aerospace engine blades. [0003] As the core components of aircraft, aero-engine components are developing in the direction of lightweight and integration. Due to its com...

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Problems solved by technology

[0005] The traditional blade electrolysis fixture usually fixes the workpiece blank on the fixture body. After a blade is processed, the workpiece needs to be removed and installed with a new blank. The whole process is time-consuming and labor-intensive, and the processing efficiency is low. Therefore, it is necessary to study a The split anode fixture which is independent of the main body of the fixture realizes the rapid replacement of the workpiece under the premise of ensuring the repeated positioning accuracy of the blank to improve the efficiency of blade replacement

[0006] In the past electrolytic processing of blades, the electrolyte usually adopts a side-flow liquid inlet method, and the electrolyte is divided into two streams from the air inlet (exhaust) side to flow through the leaf pot and the blade back processing area, and then self-discharge (into) the edge Outflow, leaf basin and blade back shape are better, but for large twisted blades, this liquid inlet method will cause sudden changes in electrolyte flow velocity at the inlet and outlet edges, and the flow field is poor, resulting in blade inlet and exhaust Edge forming is difficult, so it is necessary to study a new fixture flow channel structure to ensure the stability of the flow field during machining and improve the precision and efficiency of electrolytic machining of blades

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