Press-forming mold and method for manufacturing protective film for press-forming mold

摘要

A press-forming mold has a protective film for preventing seizing during press-forming formed on at least a forming surface that comes into contact with a formed body. The protective film is formed by PVD. An arbitrary selection section extracted from the surface of the protective film is divided into a plurality of individual sections; and, when the gradient of the surface at the n^th division point is represented by (dZn/dXn), taking N to represent the number of divisions, the root-mean-square RΔq calculated by the following numerical expression is no greater than 0.032.; $$ R\Delta q=\sqrt{\frac{1}{N}\sum _{n=1}^N{\left(\frac{d{Z}_n}{d{X}_n}\right)}^2}$$ ;It is thereby possible to improve the seizing resistance of a press-forming mold having a protective film formed by PVD.