News
May 11,2024
How about the appearance inspection of shaft forgings?
The quality inspection of shaft forgings is divided into the inspection of appearance quality and the inspection of internal quality.
The quality inspection of shaft forgings is divided into the inspection of appearance quality and the inspection of internal quality.
Appearance quality inspection is generally non-destructive inspection, usually with the naked eye or low-power magnifying glass inspection, if necessary, also using non-destructive testing methods.
For shaftForgingsThe non-destructive testing methods used in the quality inspection are generally: magnetic powder inspection method, penetration inspection method, eddy current inspection method, ultrasonic inspection method, etc.
The magnetic particle inspection method is widely used to examine ferromagnetic metal or alloy shafts.ForgingsSurface or near-surface defects, such as cracks, hairlines, white spots, non-metallic inclusions, delamination, folds, carbide or ferrite bands, etc. This method is only applicable to the inspection of ferromagnetic material shaft forgings, and is not suitable for shaft forgings made of austenitic steel. Penetration inspection method can not only check the magnetic material shaft forgings, but also check the surface defects of non-ferromagnetic material shaft forgings, such as cracks, looseness, folding, etc. Generally, it is only used to check the surface defects of non-ferromagnetic material shaft forgings, and the defects hidden below the surface cannot be found.
Eddy current testing is used to check the surface or near surface defects of conductive materials.
Ultrasonic testing method is used to check the internal defects of shaft forgings such as shrinkage cavity, white spot, core crack, slag inclusion, etc. Although the method is convenient, fast and economical, it is difficult to accurately determine the nature of the defects.
With the development of non-destructive testing technology, new non-destructive testing methods such as acoustic vibration method, acoustic emission method, laser holographic method, CT method and so on have appeared. The appearance of these new methods and their application in the inspection of shaft forgings will greatly improve the quality inspection level of shaft forgings.
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