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A Stray Corrosion Ice Suppression Method in Electrochemical Machining

A technology of electrochemical machining and stray corrosion, applied in the supply of machining working medium, etc., can solve the problems of unknown protection effect, loss of electrode penetration conductive tape, difficult removal of acrylic glue, etc., to improve orifice quality and accuracy, The effect of saving post-processing time and improving processing efficiency

Active Publication Date: 2020-08-14
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the protection effect of AC auxiliary power on the unprocessed surface in this method is unknown, and this method lacks stability and predictability compared with insulation treatment
[0008] On October 26, 2016, the patent CN106041235A disclosed a servo-type auxiliary anode electrolytic wire cutting processing system and method. The potential of the working voltage can effectively suppress the stray corrosion phenomenon in the non-processing area near the processing area of ​​the workpiece, but this method only describes the effect of applying to electrolytic wire cutting, and the applicability of other electrochemical processing is not mentioned
However, the acrylic glue used in this method is not easy to remove in the subsequent cleaning, and the electrode penetration of the conductive tape may cause a certain loss
[0010] Patent CN106270842A on January 4, 2017 discloses a processing device and method for suppressing stray corrosion in micro-electrochemical processing. The invention places an insulating cover on the periphery of the processing electrode and realizes processing control through a vertical and three-dimensional displacement stage, which can suppress type The stray corrosion on the surface of the cavity can also avoid the adverse effects of using a fixed insulating layer on the electrode side wall in the past to mill the side wall. However, the insulating cover proposed by this method needs to be customized for different shapes and sizes of the electrode.
[0011] Patent CN104801801B issued on March 1, 2017 discloses a freezing-assisted micro-hole processing method and device based on a low-temperature environment. This invention mainly utilizes a low-temperature environment to form an ice layer on the bottom of the workpiece as a contrast to maintain processing stability and improve the flow field of the working fluid. , but no solution involving stray corrosion
[0012] On November 16, 2018, the patent CN108817582A disclosed a device for cathode insulation in electrolytic machining. The invention prepares a super-hydrophobic microstructure on the surface of the cathode where insulation is required to achieve selective insulation, thereby confining the electric field to the processing area and reducing the Stray corrosion and sidewall taper, improve machining efficiency and accuracy, but this method is not suitable for electrolysis-EDM composite machining that requires sidewall electrolysis

Method used

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  • A Stray Corrosion Ice Suppression Method in Electrochemical Machining
  • A Stray Corrosion Ice Suppression Method in Electrochemical Machining
  • A Stray Corrosion Ice Suppression Method in Electrochemical Machining

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Apply a small amount of deionized water evenly to the lower edge of the annular mold 8 and attach it to the surface to be processed of the workpiece 5;

[0032] (2) Low-temperature implementation measures are adopted. The nozzle 3 continuously sprays the cooling substance 4 to cool down the area of ​​the workpiece to be processed, so that the deionized water between the lower edge of the ring mold 8 and the surface of the workpiece 5 is solidified and frozen, thereby making the ring mold 8. The lower edge is in close contact with the surface of the workpiece 5;

[0033] (3) In a low temperature environment, slowly pour an appropriate amount of deionized water into the container formed by the annular mold 8 and the surface of the workpiece 5, the deionized water in the container is frozen, and naturally freezes with the surface of the workpiece 5 to be processed and It has connection strength and forms an ice insulating protective film 6 with a certain thickness;

...

Embodiment 2

[0040] (1) Use the preformed ice layer 10 with the processing channel 11 to directly connect the prefabricated ice layer 10 to the surface of the workpiece 5 by freezing in a low temperature environment;

[0041] (2) Connect the workpiece 5 to the positive pole of the pulse power supply 7, and connect the tool electrode 2 to the negative pole of the pulse power supply 7. The working fluid 1 is supplied by flushing the inside of the tube electrode, and the tool electrode 2 moves under the drive of the feed mechanism. , the temperature controller controls the temperature of the working fluid 1, the heat and pressure of the flushing fluid in the tool electrode partially melt the ice layer to form a processing channel, and then perform electrochemical processing, the product 9 in the processing process is discharged smoothly, and the workpiece 5 The machined surface is better protected due to the existence of ice insulation 6;

[0042] (3) After the processing is finished, the tem...

Embodiment 3

[0045] (1) Apply a small amount of working fluid evenly on the lower edge of the ring mold 8 and then attach it to the surface to be processed of the workpiece 5;

[0046] (2) Low-temperature implementation measures are adopted. The nozzle 3 continuously sprays the cooling substance 4 to cool down the area of ​​the workpiece to be processed, so that the working fluid between the lower edge of the annular mold 8 and the surface of the workpiece 5 is solidified and frozen, so that the annular mold 8 The lower edge is in close contact with the surface of the workpiece 5;

[0047] (3) In a low temperature environment, slowly pour an appropriate amount of working fluid into the container formed by the annular mold 8 and the surface of the workpiece 5, the working fluid in the container is frozen, and naturally freezes with the surface of the workpiece 5 to be processed and has a connection Strength, forming an ice insulating protective film 6 with a certain thickness;

[0048] (4)...

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Abstract

The invention discloses a stray corrosion ice layer inhibition method in electrochemical processing, and belongs to the technical field of electrochemical processing. A low-temperature environment isutilized, the stray corrosion effect of stray current in the processing process is reduced by covering the non-processing surface of a workpiece with an ice layer, and the quality of the workpiece processing surface is improved. The stray corrosion ice layer inhibition method comprises the following steps that (1) an ice layer insulating protective film is prepared on the surface of a workpiece tobe processed; (2) the working environment is kept at a low temperature, and the surface needing to be processed is subjected to electrochemical processing through a processing channel; and (3) afterprocessing is finished, the temperature of the processing environment is raised, and after the ice layer is melted, the workpiece is taken out.

Description

technical field [0001] The invention belongs to the technical field of electrochemical machining, and in particular relates to a stray corrosion ice layer suppression method in electrochemical machining. Background technique [0002] Electrochemical processing technology is a processing method based on the principle of electrochemical anodic dissolution to achieve rapid removal of metal materials. Compared with the traditional mechanical processing method, this processing method is non-contact processing, which has the advantages of high speed, good surface quality, no loss of tools, no residual stress, no plastic deformation, etc. It can batch process difficult-to-machine materials and workpieces with complex shapes . However, since the electric field and flow field cannot be restrained in the desired processing area during processing, the non-processing area of ​​the workpiece is susceptible to stray corrosion caused by stray current, which affects the surface quality and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23H3/10
CPCB23H3/10
Inventor 徐正扬张璟阳张辰翔张心怡陆江伟
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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