| 摘要 |
A die for an ironing process according to the present invention is provided with a punch, and with a die that defines a molding aperture in relation to the punch. When the skewness (Rsk) of a surface-treated metal plate is less than -0.6 and at least -1.3, the curvature radius of the die shoulder, and the clearance between the punch and the R tangent, are determined such that Y, which is represented by {(t |
