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Surface Oxidation of Aeroengine Titanium Alloy Hub and Removal of Residual Silver

An aero-engine surface oxidation technology, which is applied in the field of aero-engine titanium alloy hub surface oxidation and residual silver removal process, can solve the problems of affecting the maintenance cycle, delaying the engine maintenance cycle, and the quality cannot be fully guaranteed, so as to achieve simple operation, Realize the effect of mass production

Active Publication Date: 2017-07-28
珠海保税区摩天宇航空发动机维修有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no oxidation and residual silver removal technology in China, and there is no ability to remove oxidation and residual silver. This part cannot be cleaned and inspected within the company, and the silver removal process of the high-pressure compressor hub of the engine has to be sent abroad. Not only does it affect our maintenance cycle, but at the same time, the unpredictability in the transportation process often delays the entire engine maintenance cycle, and it is impossible to achieve deeper maintenance, which cannot be fully guaranteed in terms of quality

Method used

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  • Surface Oxidation of Aeroengine Titanium Alloy Hub and Removal of Residual Silver
  • Surface Oxidation of Aeroengine Titanium Alloy Hub and Removal of Residual Silver
  • Surface Oxidation of Aeroengine Titanium Alloy Hub and Removal of Residual Silver

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) Workpiece pre-cleaning: Use degreasing method to remove oil stains on the surface of the high-pressure compressor hub of the engine, specifically: immerse the workpiece in the degreasing solution TURCO5948DPM for 15 minutes to remove the oil stains on the surface of the workpiece. The workpiece is washed with cold water and sprayed with high-pressure water successively to remove the residual solution and residue on the surface of the workpiece. Then soak the workpiece in 85ºC hot water for 10 seconds. Remove the moisture on the surface of the workpiece, use compressed air to blow off excess moisture on the surface of the workpiece, and then put it in a hot air circulating oven for drying at 125ºC for 20 minutes.

[0040] Clamp the degreasing workpiece in the support fixture. like image 3 As shown, the support fixture is composed of a base 4 , two small-end brackets 2 and two large-end brackets 3 . Both the small end bracket 2 and the big end bracket 3 are provid...

Embodiment 2

[0050] (1) Workpiece pre-cleaning: use the degreasing method to remove the oil stains on the surface of the high-pressure compressor hub of the engine, specifically: immerse the workpiece in the degreasing solution TURCO5948DPM for 18 minutes to remove the oil stains on the surface of the workpiece. The workpiece is then rinsed with cold water and then sprayed with high-pressure water to remove the solution — and residues — remaining on the surface of the workpiece. Then soak the workpiece in 85ºC hot water for 15 seconds. Remove the moisture on the surface of the workpiece, use compressed air to blow off the excess moisture on the surface of the workpiece, and then put it in a hot air circulation oven for drying, temperature: 130ºC, time 15 minutes.

[0051] Clamp the degreasing workpiece in the support fixture. After clamping the high pressure compressor hub of the engine, use sand blowing equipment to blow sand into the tenon groove of the workpiece, and rotate the high pr...

Embodiment 3

[0060] (1) Workpiece pre-cleaning: use the degreasing method to remove the oil stains on the surface of the high-pressure compressor hub of the engine, specifically: immerse the workpiece in the degreasing solution TURCO5948DPM for 20 minutes to remove the oil stains on the surface of the workpiece. The workpiece is then rinsed with cold water and then sprayed with high-pressure water to remove the solution — and residues — remaining on the surface of the workpiece. Then immerse the workpiece in hot water at 75ºC for 20 seconds. Remove the moisture on the surface of the workpiece, use compressed air to blow off excess moisture on the surface of the workpiece, and then put it in a hot air circulation oven for drying, temperature: 135ºC, time 10 minutes.

[0061] Clamp the degreasing workpiece in the support fixture, clamp the engine high pressure compressor hub, use sand blowing equipment to blow sand into the groove of the workpiece, and rotate the engine high pressure compres...

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Abstract

The invention discloses a process for removing surface oxidation and residual silver of an aero-engine titanium alloy hub, which comprises the following steps: (1) pre-cleaning of workpieces; (2) coating protection treatment of workpieces; (3) thermal etching of workpieces; (4) ) nitric acid corrosion; (5) inspection; (6) removal of protective coating; (7) cleaning; (8) workpiece heating dehydrogenation. The goal of comprehensively and efficiently removing the surface oxidation and residual silver of the high-pressure compressor hub workpiece of the engine has been achieved.

Description

technical field [0001] The invention relates to a process for removing oxidation and residual silver on the surface of an aero-engine titanium alloy hub. Background technique [0002] The nuts of the connecting bolts between the high-pressure compressor hub (titanium alloy material) and other hubs of civil aviation engines are silver-plated. During the operation of the engine, the halogen elements in the air react with the silver-plated layer on the nut to form halogenation. The silver falls off and is immersed in the titanium alloy disk. Since the titanium alloy is very sensitive to halogen, the titanium alloy disk is corroded after the silver halide is immersed. During the operation, at a higher temperature, due to the action of stress, corrosion cracks are developed. A fatal hazard to the normal operation of the engine. [0003] In order to ensure the safe operation of the engine, the residual oxide or residual silver attached to the surface of the titanium alloy hub mus...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F1/00C23F1/26B24C1/00
Inventor 郭平
Owner 珠海保税区摩天宇航空发动机维修有限公司