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Chemical method for checking defects on processed carburized surface of steel part

A surface processing and chemical method technology, applied in the preparation of test samples, color/spectral characteristic measurement, etc., can solve the problems of long operation cycle and inability to inspect defects macroscopically, and achieve the effect of effective product quality

Active Publication Date: 2015-01-14
SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, for the inspection of defects on the carburized surface, the method of metallographic inspection on the sample is adopted, which not only has a long operation cycle, but also cannot perform macroscopic inspection on the defects generated during the processing of parts

Method used

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  • Chemical method for checking defects on processed carburized surface of steel part
  • Chemical method for checking defects on processed carburized surface of steel part
  • Chemical method for checking defects on processed carburized surface of steel part

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] For an inner bearing ring part, the bearing ring part has a carburized surface, and the rest of the surface has no carburized layer. The present invention is used to perform a macroscopic inspection of the carburized surface processing defects according to the following steps:

[0027] (1) Water-based oil removal: Use Turco4215 with a concentration of 36 g / L to remove oil, the dosage is 28.8 kg, and the solution temperature is 55 °C;

[0028] (2) When performing the water washing process, wash with running water at room temperature for 10 seconds, turn on the spray device, and rinse the parts with a water gun to remove residual solution traces, and the parts will not appear rusted;

[0029] (3) Water film inspection: Drain for 5s to check the water film, the water film inspection time is 20s, and the water film is continuous;

[0030] (4) Anode cleaning: parts are used as anodes, and the tank body is used as cathodes. The solution composition is 52kg of sodium hydroxide...

Embodiment 2

[0038] For a low-pressure short shaft part, the bearing ring part has a carburized surface, and the rest of the surface has no carburized layer. The present invention is used to perform a macroscopic inspection of the carburized surface processing defects according to the following steps:

[0039] (1) Water-based oil removal: Use Turco4215 with a concentration of 42g / L to remove oil, the dosage is 42kg, and the solution temperature is 60°C;

[0040] (2) During the water washing process, wash with running water at room temperature for 20 seconds, turn on the spray device, and rinse the parts with a water gun to remove residual solution traces, and the parts will not appear rusted;

[0041] (3) Water film inspection: Drain for 10s to check the water film, the water film inspection time is 25s, and the water film is continuous;

[0042] (4) Anode cleaning: parts are used as anodes, and the tank body is used as cathodes. The solution composition is 80kg of sodium hydroxide solutio...

Embodiment 3

[0050] The front short shaft part of a certain compressor has a carburized surface on the bearing ring, and no carburized layer on the rest of the surface. The present invention is used to perform a macroscopic inspection on the processing defects of the carburized surface according to the following steps:

[0051] (1) Water-based oil removal: Use Turco4215 with a concentration of 48g / L to remove oil, the dosage is 57.6kg, and the solution temperature is 50°C;

[0052] (2) During the water washing process, wash with running water for 30s at room temperature, turn on the spray device, and rinse the parts with a water gun to remove residual solution traces, and the parts will not appear rusty;

[0053] (3) Water film inspection: Drain for 20s to check the water film, the water film inspection time is 30s, and the water film is continuous;

[0054] (4) Anode cleaning: the part is used as the anode, and the tank is used as the cathode. The solution composition is 110.4kg of sodium...

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Abstract

The invention belongs to the field of checking of defects on processed carburized surface of a steel part and particularly relates to a chemical method for checking the defects on the processed carburized surface of the steel part. The chemical method comprises specific operation steps of performing pre-processing, first performing water-base oil removal, performing alkaline anodic treatment and sulfuric acid anodic corrosion to remove oxides on the surface and obtain clean surface and then performing nitric acid corrosion, wherein the carburized surface is gray after the nitric acid corrosion, the positions where the defects exist presents different colors and shapes, and accordingly the defects including softening, rehardening, carbonized soft spots, decarburization, grinding traces or scratch, crack, corrosion and the like of a carburizing layer in the carburizing and grinding process are displayed clearly. By means of the chemical method, the surfaces of the parts with the carburizing layers and parts without the carburizing layers can be placed into a tank simultaneously, the positions where the carburizing layers do not exist do not need insulating protection, the defects of the carburizing layers can be ensured to be displayed, and over corrosion are caused at other positions. In addition, macroscopic checking can be directly performed to parts, and the product quality can be effectively monitored.

Description

technical field [0001] The invention belongs to the field of inspection of carburized surface processing defects of steel parts, in particular to a chemical method for inspecting carburized surface processing defects of steel parts. Background technique [0002] During the use of steel parts, in order to meet the hardness requirements of a certain part, carburizing treatment is used to increase the carbon content of the surface layer of the steel part, and after proper heat treatment, the surface layer has high hardness, wear resistance and Contact fatigue strength. However, in the carburizing process and subsequent carburizing surface processing, there will be defects that affect the quality of carburizing. These defects are extremely harmful in production and application, and seriously affect the service life of parts. It can accurately display the defects produced in carburizing and grinding, and monitor the appropriate amount of products, which directly affects the safe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/25G01N1/28
Inventor 赵永岗冯湛赵玉生王辉周英杰
Owner SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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