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There are many necessary conditions for the good peening effect: good material surface; choosing the right shot pressure; select suitable steel pellets; process and technical problems and so on, which are very important. Today we will talk about the quality of steel pills, the impact on the quality of peening.
Steel shot peening may cause plastic deformation on the surface of the part change the surface roughness of parts. Surface roughness is a kind of micro geometry error, also known as micro irregularity. The surface roughness is the same as the surface wave-degree and shape error, which belong to the geometric shape error of the part, and the surface roughness has an important influence on the performance of machine parts.
The influence of steel pellets on the surface roughness of materials is usually within the range of Ra0.6 ~ 20mm. Without changing the process parameters, the higher the original surface roughness of the material, the larger the Ra value after shot peening. Production practice has proved that the surface roughness which below 6.3mm can improved or maintained by shot blasting. If the original surface roughness is above 6.3mm, the surface roughness will be reduced after shot peening.
We know that different sizes of steel pellets have different hardness and performance, but what is the difference in the cleaning effect of steel pellets with different hardness? The harder the steel pill, the more brittle it will be. When cleaning the workpiece, although the cleaning efficiency is greatly improved, the consumption of steel pellets will increase, and the service life of steel pellets will also be shortened. Therefore, from the perspective of economic benefits, for general workpieces, we recommend choosing steel balls with moderate hardness for rust removal.
The effect of workpiece treatment is not only related to the hardness of steel pellet, but also to the type and shape of steel pellet.. For example, steel pellets with irregular surfaces are more efficient in removing rust than round pellets. However, when choosing steel pills for derusting, consumers must start from the models, hardness, specifications and shape of steel pills according to their actual requirements.