Press-forming mold and method for manufacturing protective film for press-forming mold
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United States of America Patent
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Feb 27, 2018
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app pub date -
Apr 3, 2012
filing date -
Apr 18, 2011
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Abstract
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 nth 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.
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