Spectrum Analysis of Surface Roughness Wave Generated by Friction Stir Forming on A5083 Aluminum Alloy Plate

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  • A5083アルミニウム合金板の摩擦攪拌成形における表面粗さのスペクトル分析

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<p>In this paper, surface-roughness-waves generated by friction stir forming with a mirror-polished die were evaluated with spectrum analysis utilizing maximum entropy method (MEM). An A5083P-O aluminum plate, 3 mm thick, was put on the die, and friction stirring was conducted on its back surface with a probe-less tool in 18 mm shoulder diameter. Then, the surface of a mirror-finished die was transferred onto the metal plate, and power spectrum of surface-roughness-waves of the printed surface was investigated. As the result, a 0.34mm-wavelength roughness-wave observed on the original surface of the base metal was removed via the transcription of the mirror-finished surface. Maximum wavelength of remained roughness-wave tended to be shorter with faster tool-rotate-speed except 1750rpm. On the other hand, it did not seem that the tool feed rate was associated with the remained maximum wave length.</p>

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