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High Surface roughness by Ningbo Tianhui

2022-05-12

Surface roughness refers to the unevenness of small distances and small peaks and valleys of the machined surface [1]. The distance (wave pitch) between the two wave crests or two wave troughs is very small (below 1mm), which belongs to the micro-geometric error. The smaller the surface roughness, the smoother the surface.

Surface roughness is generally formed by the processing method used and other factors, such as the friction between the tool and the surface of the part during processing, the plastic deformation of the surface metal when the chips are separated, and the high-frequency vibration in the process system. Due to different processing methods and workpiece materials, the depth, density, shape and texture of marks left on the machined surface are different.

Surface roughness is closely related to the matching properties, wear resistance, fatigue strength, contact stiffness, vibration and noise of mechanical parts, and has an important impact on the service life and reliability of mechanical products. Ra is generally used for marking.

The relevant specifications are "GB/T 1031-2009 "Surface Structure-Profile Method Surface Roughness Parameters and Their Values" and "GB/T 131-2006 (ISO 1302:2002) "Surface Structure Representation".

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