Electrolytic small hole processing method of transient frozen ice layer

Abstract

The invention discloses an electrolytic small hole processing method of a transient frozen ice layer, and belongs to the field of special processing. The electrolytic small hole processing method is characterized in that when a low-temperature workpiece is impacted by positive-flow electrolyte, the temperature of the electrolyte is cooled in the backflow process, the electrolyte is transiently frozen into ice when reaching the freezing point, and the ice is wrapped around the periphery of the processed hole wall and the periphery of the hole. Due to the reduction of the ionic activity at low temperature, the electrochemical dissolution phenomenon at the wrapping part of the ice layer almost disappears, the phenomenon of stray corrosion at the hole wall and the hole opening can be effectively relieved, and processing of small holes with high quality and small taper can be realized.

Description

technical field [0001] The invention relates to an electrolytic processing method for small holes, which belongs to the technical field of special processing, and specifically relates to an electrolytic small hole processing method and device based on the instantaneously frozen ice layer on the processed wall surface. Background technique [0002] With the development and progress of technology, the small hole structure has been widely used in aviation, aerospace, machinery, ships and other aspects. At the same time, the requirements for the structure of the small holes are getting higher and higher, and a large number of difficult-to-machine structures such as group holes, inclined holes, and small holes with a large depth-to-diameter ratio are widely used. At the same time, most of the processed materials are high-temperature alloys, hard alloys and other difficult-to-machine materials. All of these put forward high requirements on the processing technology of small holes...

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Problems solved by technology

[0006] Ma Ning, Shenyang Aerospace University, etc. conducted an experimental study on the electrolytic machining of small holes with tube electrodes (Electrolytic Machining and Die, 2018, Supplement 1: 33~36), using neutral salt solution instead of acid solution, and analyzed the voltage and electrolyte concentration The effect on the hole diameter, different electrolysis speeds and different voltage values ​​affect the processing depth, but the stray corrosion phenomenon still exists

Wei Zeng of Qingdao University of Science and Technology proposed an experimental study on the electrolytic machining of small holes by ultrasonic disturbance electrolyte (Mold Technology, 2018 (5): 57~63). By studying the impact of ultrasonic disturbance electrolyte and conventional electrolytic machining on the side clearance, The influence of processing speed and processing accuracy shows that ultrasonic disturbance electrolyte can reduce the processing gap, improve processing speed and processing accuracy, but it still does not solve the occurrence of stray corrosion in the processing process

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