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The proposal and development of surface roughness standards are closely related to the development of industrial production technology. It has gone through two stages from qualitative assessment to quantitative assessment. The effect of surface roughness on the surface performance of machine parts has been the first to be noticed since 1918. In the design of aircraft and aircraft engines, due to the requirement of using the least material to achieve maximum strength, people began to treat the surface of the tool marks and scratches on the fatigue strength Study the impact. However, due to the difficulty of measurement, there was no quantitative evaluation requirement at that time, which was only determined based on visual perception. In the 1920s and 30s of the 20th century, many industrial countries in the world widely used a combination of triangular symbols (▽) to represent processed surfaces with different precisions.
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