| 摘要 |
PROBLEM TO BE SOLVED: To provide a press forming die and its surface treating method which hardly generate failures such as seizing and galling. SOLUTION: This press forming die is used for press-forming in the warm range of 600-900°C and boronized film 13 is provided by salt-bath treatment of boron at treating temperature higher than that of the warm region on the die forming surface 12 of the die body 11 consisting of a ferrous material, micro-blasting is performed to the surface of the boronized film 13 and a smooth surface 16 is formed by smoothing the surface of the boronized film 13. COPYRIGHT: (C)2007,JPO&INPIT
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