| 摘要 |
A press-forming die set including a first die and a second die which are linearly movable in a press-forming direction for mutual engagement to form a negative-angle portion on a workpiece placed on the second die, the press-forming die further including a rotary cam having a first negative-angle forming portion, and a forming cam having a second negative-angle forming portion. The first negative-angle forming portion is disposed such that the rotary cam is rotatable about an axis of rotation inclined with respect to a bottom surface of the workpiece. The rotary cam is engageable with the second die and is rotated about the axis of rotation in one of opposite directions when the first and second dies are moved toward each other, and is rotated in the other direction when the first and second dies are moved away from each other. The forming cam is held in engagement with the first negative-angle forming portion while the first and second dies are held in engagement with each other, and is disengaged from the first negative-angle forming portion when the first and second dies are spaced apart from each other.
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