Structure Around Through Holes In Metal Sheet, And Blank And Automotive Part

Abstract: In the present invention, a metal sheet 200 has a flat sheet part 102 and a processed part 204 in which a through-hole 104a is formed in the center part thereof. The processed part 204 includes a flat surface 406 formed on one side with respect to the thickness direction A relative to the flat surface 102a of the flat sheet part 102, and an inclined surface 408 extending from the flat surface 406 towards the flat surface 102a, and "1.0=W=–3.8314×(R/t)+11.47=5.0" and "0.1=H=–0.6604×(R/t)+2.0489=1.0". In the above relationships, W is the length (mm) of the inclined surface 408 in a direction orthogonal to the thickness direction A, R is the curvature radius (mm) of the through-hole 104a as viewed from the thickness direction A, t is the thickness (mm) of the metal sheet 200, and H is the distance (mm) between the flat surface 102a and the flat surface 406 in the thickness direction A.

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