Electrolytic small hole processing method of transient frozen ice layer

A hole processing method and ice layer technology, applied in the electrolytic processing of small holes, based on the field of electrolytic small hole processing of the frozen ice layer on the processed wall, to improve the quality of the hole, suppress stray corrosion, and slow down stray corrosion Effect

Inactive Publication Date: 2019-11-01
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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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

Method used

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  • Electrolytic small hole processing method of transient frozen ice layer
  • Electrolytic small hole processing method of transient frozen ice layer

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Embodiment Construction

[0017] The following is a specific description in conjunction with the figure:

[0018] figure 1 Shows ice conditions at the beginning of processing. Because the electrolyte has a certain temperature, the ice layer is only formed in the far range from the processing area at the beginning, and the processing area is still normal electrolytic processing.

[0019] figure 2 Shows the condition of the ice layer after processing for a period of time. As the processing progresses, the small hole becomes deeper and deeper, and the flow of the working fluid backflow along the hole wall becomes longer and longer. The working fluid gradually cools, and the ice layer continues to expand from the outside to the inside, and finally covers the hole on the processed surface. wall, so that the stray corrosion around the hole wall is reduced. At the same time, since the upper surface of the hole is also covered with ice, the stray corrosion of the hole will also be suppressed.

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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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Application Information

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IPC IPC(8): B23H9/16
CPCB23H9/16
Inventor 徐正扬陆江伟张璟阳
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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