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Method for judging overheating discoloration trace of aero-engine main bearing

A technology for aero-engines and main bearings, which is used in the testing of mechanical bearings, the use of mechanical devices, and the measurement of color/spectral properties. , the effect of stable state

Active Publication Date: 2020-04-07
SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] (2) Material discoloration due to overheating
[0010] Since the main bearing is a precision part, the hardness inspection can only be performed on the non-working surface (such as the end face of the ring). For parts such as rolling elements, the entire surface is the working surface, so the hardness inspection cannot be performed. A method for judging the traces of overheating and discoloration of main bearings of aeroengines

Method used

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  • Method for judging overheating discoloration trace of aero-engine main bearing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] In Example 1, the main bearing material is M50 steel, and the mass percentages of the components of the acid solution are oxalic acid: 10%, nitric acid: 10%, and distilled water: the balance.

[0050] The above-mentioned method for judging the overheating and discoloration traces of the main bearing of the aero-engine, the specific implementation steps are as follows:

[0051] Step 1, pre-processing:

[0052] Use gasoline to clean the surface of the main bearing to remove oil and impurities to ensure that there is no blockage;

[0053] Step 2, judging the discoloration of overheating traces:

[0054] (1) Weigh distilled water, oxalic acid and nitric acid according to the mass percentage, and add them into the tank of the ultrasonic cleaning machine in turn, stir and heat the acid solution to 50°C, and the ultrasonic frequency is 30KHz; put the main bearing that needs to determine the trace of overheating discoloration into In the acid solution, ultrasonic for 60 minut...

Embodiment 2

[0061] In Example 2, the main bearing material is W9Cr4V2Mo steel, and the mass percentages of the components of the acid solution are oxalic acid: 10%, nitric acid: 5%, and distilled water: the balance.

[0062] The above-mentioned method for judging the overheating and discoloration traces of the main bearing of the aero-engine, the specific implementation steps are as follows:

[0063] Step 1, pre-processing:

[0064] Clean the surface of the main bearing with acetone, remove impurities and oil, and ensure no blockage;

[0065] Step 2, judging the discoloration of overheating traces:

[0066] (1) Weigh distilled water, oxalic acid and nitric acid according to the mass percentage, and add them to the tank of the ultrasonic cleaning machine in turn, stir and heat the acid solution to 70°C, and the ultrasonic frequency is 25KHz; put the main bearing that needs to determine the trace of overheating discoloration into In the acid solution, ultrasonic for 40 minutes; among them...

Embodiment 3

[0073] In Example 3, the main bearing material is Cr15 steel, and the mass percentages of the components of the acid solution are oxalic acid: 5%, nitric acid: 10%, and distilled water: the balance.

[0074] The above-mentioned method for judging the overheating and discoloration traces of the main bearing of the aero-engine, the specific implementation steps are as follows:

[0075] Step 1, pre-processing:

[0076] Clean the main bearing with gasoline to remove surface attachments and residual lubricating oil to ensure no blockage;

[0077] Step 2, judging the discoloration of overheating traces:

[0078] (1) Weigh distilled water, oxalic acid and nitric acid according to the mass percentage, and add them to the tank of the ultrasonic cleaning machine in sequence, stir and heat the acid solution to 50-70°C, and the ultrasonic frequency is 20KHz; it will be necessary to determine the main bearing of overheating and discoloration marks Put it into the acid solution and ultras...

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Abstract

The invention relates to a method for judging an overheat discoloration trace of a main bearing of an aero-engine, in particular to a method for judging the overheat discoloration trace of the main bearing after running-in test run of the aero-engine. The method specifically comprises the following steps: 1) removing impurities and oil on the main bearing surface; 2) carrying out overheating tracediscoloration judgment, and judging whether the main bearing is scrapped or can be normally used according to the surface color wiping condition; 3) confirming that main bearing with oxidized and coked grease is added in to saturated sodium carbonate solution for cleaning and neutralizing; 4) detecting the size of the main bearing. According to the method, on-site engineering application is good,the state is stable, and the problem that the main bearing is scrapped due to inaccurate judgment of an overheat discoloration trace is solved.

Description

technical field [0001] The invention belongs to the technical field of mechanical system design of aero-engines, and specifically relates to a method for judging overheating and discoloration traces of main bearings after aero-engine running-in tests, so as to avoid the scrapping of main bearings due to inaccurate judgment of overheating and discoloration traces, and the need to reassemble new main bearings Performing additional test runs increases costs and delays production cycles. Background technique [0002] An aero engine generally consists of a compressor system, a turbine system, a mechanical system, a control system, a combustion chamber system, and a nozzle system. One of the mechanical systems, which can also be called power transmission system or transmission and lubrication system, mainly includes engine main bearing, lubricating oil system and components, main bearing cavity, main bearing sealing booster system and sealing device, central transmission and exter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M13/04G01N21/29G01N19/00
CPCG01M13/04G01N19/00G01N21/29
Inventor 梁存良郭颖王志哲徐玮王斌
Owner SHENYANG LIMING AERO-ENGINE GROUP CORPORATION