無潤滑下の調質圧延における表面粗さ転写(<特集>調質圧延のミクロ変形解析および実機操業技術の最近の進歩)

概要

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One of the important qualities of cold rolled steel sheet is the surface texture, which is obtained with imprinting of a dull roll surface texture. It is controlled by real operation data and experience, because the mechanism of the surface imprinting has not been clarified. In this study, surface imprinting is investigated in temper rolling as a dry condition by the 4Hi rolling mill. Temper rolling experiments for as-annealed low carbon steel strips and as-annealed high carbon steel strips are conducted in the range of 1 to 11% in reduction. A shot dull roll and an electric-discharged dull roll were employed. Surface microstructures of temper rolled strips are observed directly, as well as surface textures in terms of mean roughness (Ra), three dimensional textures, cross section profiles, material ratio curves, and probability densities applied to compare the surface imprinting. As a result, the rolled steel strip surfaces have been transcribed with the same texture with peaks of the roll surface. The electric-discharged dull roll shows better surface imprinting than the shot dull roll.
2008-10-01