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Method for increasing aluminum alloy surface hard anode oxidation surface roughness

A technology of hard anodic oxidation and surface roughness, which is applied in the field of surface treatment, can solve problems such as surface grinding of grinding machines, and achieve the effects of enhancing wear resistance, ensuring dimensional accuracy, and improving surface roughness

Active Publication Date: 2008-02-20
CHANGHE AIRCRAFT INDUSTRIES CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the part is made of aluminum alloy, it is not possible to use a grinding machine for surface grinding

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The outer cylinder of aluminum alloy parts, the material is: pre-stretched aluminum plate 7050 / T7451. The inner cavity surface and the piston assembly have mutual movement, which belongs to the movement friction surface. In order to improve the wear resistance of the parts and reduce the frictional movement loss of the mating surface apron, the design requires 100% hard anodization of the stepped holes on the inner cavity surface, the thickness of the anodized layer is 40-60μm, and the surface roughness value Ra0 after plating .32.

[0026] The processing steps are as follows:

[0027] 1. After rough machining, process the outer surface to size first, leaving a margin of 0.01-0.02mm for polishing;

[0028] 2. When processing the inner cavity surface, first finish machining to the size 3 times, leaving a 0.02-0.03mm margin for polishing. After each finishing, the parts are naturally aged and stress is relieved, and the influence of the deformation of the parts is minimized. ...

Embodiment 2

[0032] Carry out hard anodization on the surface of the ball joint, the thickness is 50-60μm, and the surface roughness is Ra0.32. The processing steps are as follows:

[0033] 1. After the rough machining is finished, first process the inner cavity surface to the size, leaving 0.01-0.02mm margin for polishing;

[0034] 2. When processing the outer surface, first finish it to the size 3 times, leaving a 0.02-0.03mm margin for polishing. After each finish processing, the parts are naturally aged and stressed, and the influence of the deformation of the parts is minimized. Effectively ensure the dimensional accuracy of parts;

[0035] 3. Fine polishing on a large area of ​​the spherical outer surface, using point-to-point polishing method, measuring the aperture at any time, comparing the roughness at any time, polishing point by point, successfully making the final aperture of the part qualified, and the roughness value has reached Ra 0.16 or more.

[0036] 4. Hard anodizing adopts...

Embodiment 3

[0038] The outer cylinder of the damper is made of aluminum alloy. The moving friction surface requires 100% hard anodization. The thickness of the anodized layer is 80-100μm. The surface roughness value after plating is Ra0.32, and the surface roughness value before plating is Ra0.16. .

[0039] The finishing steps are as follows:

[0040] 1. After the rough machining is finished, first process the outer surface to the size, leaving a margin of 0.01-0.02mm for polishing;

[0041] 2. When processing the inner cavity surface, first finish it to the size 3 times, leaving a 0.02-0.03mm margin for polishing. After each finishing, the parts are naturally aged and stress is relieved, and the influence of the deformation of the parts is minimized. , Which effectively guarantees the dimensional accuracy of the parts;

[0042] 3. On the basis of the large-area fine polishing of the inner cavity surface, using the precise positioning of the CNC machine tool, the point-to-point polishing met...

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Abstract

The invention belongs to the surface processing technology and discloses the innovation on the method of improving the surface roughness concentration through proceeding hard anode oxidizing operation to the surface of the aluminum alloy spare parts with high accuracy and high wearing requirements. The innovation comprises the following steps: improving the surface roughness concentration of the spare parts before hard oxidizing operation; proceeding hard anode oxidizing operation. The invention is able to ensure the dimensional accuracy of the spare parts and greatly improves the surface roughness concentration; furthermore, the invention effectively improves the surface roughness concentration of the aluminum alloy surface proceeded with hard anode oxidizing operation and reinforces the wearing bearable performance.

Description

Technical field [0001] The invention belongs to surface treatment technology and relates to an improvement of a method for improving the surface roughness of aluminum alloy parts with high precision and high wear resistance requirements after being hard anodized. Background technique [0002] In order to improve the wear resistance of aluminum alloy parts and reduce the frictional loss of the mating surface, hard anodizing is usually performed on the moving friction surface. The surface roughness is a key indicator that affects the wear resistance of the oxide layer. The smoother the surface. The better the abrasion resistance. After the hard anodizing treatment, the surface roughness of the parts will generally drop by one to two grades. To solve this problem, the usual approach is to increase the surface roughness before hard anodizing. For example: if you want to make the parts reach the surface roughness value Ra0.32 after oxidation, it means that the parts require the surfac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/04
Inventor 汪洋黄永亮
Owner CHANGHE AIRCRAFT INDUSTRIES CORPORATION
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