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2024
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Surface roughness is a parameter that describes the degree of microscopic unevenness on the surface of an object
Source：
Different surface roughness
| surface characteristics | surface roughness(Ra) Value | Examples of processing methods |
| Knife marks are visible | Ra100、Ra50、Ra25 | Rough turning, rough planing, rough milling and drilling |
| Slight knife marks | Ra12.5、Ra6.3、Ra3.2 | Fine turning, fine planing, fine milling, rough hinge |
| No processing traces can be seen in rough grinding, and the processing direction is slightly resolved. | Ra1.6、Ra0.8、Ra0.4 | Fine car, fine grinding, fine hinge, grinding |
| Dark Gloss Surface | Ra0.2、Ra0.1、Ra0.05 | Grinding, honing, ultra-precision grinding,Polishing |
Surface roughness is a parameter that describes the degree of microscopic irregularities on the surface of an object. This degree of unevenness can be obtained by various processing methods, and different processing methods will result in different surface roughness. Here is a detailed explanation about the table you gave:
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Different surface roughness：
- The surface roughness is expressed by an Ra value in units of micrometers (μm). The smaller the Ra value, the smoother the surface.
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surface characteristics：
- Describes what the surface looks like. For example, "clearly visible knife marks" means that there are obvious cutting marks on the surface after processing.
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Surface roughness (Ra) value：
- These values represent different ranges of Ra values. For example, Ra100 means that the maximum and minimum height difference of the surface is around 100 μm.
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Examples of processing methods：
- This section lists common processing methods that produce the surface roughness described above. For example, rough turning, rough planing, and the like will produce a larger Ra value, while grinding, polishing, and the like will produce a smaller Ra value.
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Measurement method：
- The surface roughness can be measured by various methods, such as using a surface roughness meter, a profilometer, etc. These instruments make it possible to measure the degree of microscopic irregularities of the surface, thereby obtaining the Ra value.
Summary: Surface roughness is an important parameter to describe the microscopic unevenness of the surface of an object, and it is closely related to the processing method and surface quality. Understanding and controlling surface roughness is very important for many industrial applications, such as wear resistance, sealing, and lubricity of mechanical parts.
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