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Method for protecting non-processed workpiece surface by utilizing passivation metal coating in electrochemical machining

A metal coating and workpiece surface technology, applied in the direction of electrochemical processing equipment, metal processing equipment, manufacturing tools, etc., can solve the problem that the influence of stray corrosion cannot be fundamentally eliminated, and solve the problem of stray corrosion. It is widely applicable and The effect of simple and convenient operation

Inactive Publication Date: 2015-03-04
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

The above methods can effectively reduce stray corrosion, but they all have their limitations, and cannot fundamentally eliminate the influence of stray corrosion

Method used

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  • Method for protecting non-processed workpiece surface by utilizing passivation metal coating in electrochemical machining
  • Method for protecting non-processed workpiece surface by utilizing passivation metal coating in electrochemical machining
  • Method for protecting non-processed workpiece surface by utilizing passivation metal coating in electrochemical machining

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Experimental program
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Effect test

Embodiment Construction

[0022] figure 1 It is a schematic diagram of stray corrosion in different electrolytic machining. It can be seen that stray corrosion is ubiquitous in electrolytic machining, and stray corrosion leads to poor forming accuracy of processed workpieces.

[0023] combine figure 2 , 3 , illustrate the implementation process of the present invention:

[0024] (1) Apply a layer of passivating metal coating on the entire initial workpiece surface by thermal spraying technology or electrochemical deposition method; since the applied passivating metal coating may have a small amount of corrosion on the non-processed surface, the coating The thickness of the layer can be slightly adjusted according to the amount of corrosion;

[0025] (2) Use electrolytic machining to remove workpiece material in the machining area;

[0026] (3) After processing, remove the passivating metal coating with passivating properties;

[0027] (4) Clean the parts.

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Abstract

The invention relates to a method for protecting a non-processed workpiece surface by utilizing a passivation metal coating in electrochemical machining. The method comprises the following steps: step 1, coating the surface of an initial workpiece with a layer of passivation metal coating by adopting a thermal spraying technology or an electrochemical deposition method; step 2, removing a workpiece material by utilizing an electrochemical machining way; step 3, removing the passivation metal coating after the machining is completed; step 4, washing a component. The method has an important significance in reducing stray corrosion in the electrochemical machining and improving the machining precision.

Description

Technical field [0001] The invention discloses a method for protecting the surface of a non-machined workpiece by using a passivation metal coating in electrolytic machining, which belongs to the technical field of electrolytic machining. Background technique [0002] Electrolytic machining is the use of electrochemical reactions to remove workpiece material, which is non-contact processing. Compared with traditional machining, it has the advantages of no residual stress on the surface of the workpiece, no cold hardening, no plastic deformation, low surface roughness, and no tool loss. Therefore, electrolytic machining is suitable for the processing of thin-walled parts, space curved surfaces, and complex-shaped difficult-to-cut materials, and has been widely used in many fields such as aviation, automobiles, national defense, and medical equipment. However, due to the difficulty of controlling the precision, the development of electrolytic machining has been greatly restri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23H3/00
CPCB23H3/00
Inventor 王登勇鲍均朱增伟朱荻
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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