The processing quality of machine parts, in addition to the processing accuracy, also has the processing surface quality, which is the representation of the integrity of the surface layer after processing.
With the rapid development of modern machine manufacturing industry, the requirements for machine parts are increasing day by day. Some important parts must work under the conditions of high speed, high temperature, high pressure and heavy load. Any defect in the surface layer not only directly affects the working performance of parts, but also causes accelerated wear, corrosion and failure of parts. Therefore, we must pay attention to the surface quality.
① Surface roughness surface roughness refers to the micro geometric error of machined surface. In Figure 5-8 (a), R. Represents the arithmetic mean deviation of the roughness profile. The surface roughness is usually formed by the movement path of cutting tool in machining, and the ratio of wavelength to wave height is generally less than 50.
② Surface waviness and surface transition are periodic geometric errors between macro geometric errors (△ *) and micro geometric errors (roughness). In Fig. 58 (b), a represents the height of waviness. The surface waviness is usually caused by the low frequency vibration of the process system in the process of machining, and the ratio of the surface waviness to the wave height is generally 50 ~ l ∞ 0
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