金属材料の機械加工面性状の不規則性評価に関するフラクタル解析の適用

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Roughness of a mechanically finished surface of any machine component is expected to depend on both finishing methods and evaluation procedures. It is supposed that the surface finished by buffpolishing is flat and smooth comparing with the surface finished by a shaper. Even if a surface is finished by a definite procedure, the roughness depends on the technical procedure of the measurement. If one observes a surface finished by a certain method with the naked eye, it looks flat and smooth. But the surface looks rough, if one observes it by means of a high-resolution microscope. The roughness tends to be distinct with an increase of the resolution of the microscope. This aspect can be attributed to a fractal nature of the mechanically finished metal surface. From this point of view, the fractal analysis is applied to evaluate the geometrical irregularity of the surface finished by typically different methods of shaper finishing, milling, grinding and buff-polishing. It is finally found that the geometrical irregularity of the surface is well evaluated by combining the fractal dimension and additional indices peculiar to the machining methods.
社団法人日本機械学会の論文
1998-04-26

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