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US 2008/0184764 A1Published application
Press forming die set and method
AssigneeHonda Motor Co., Ltd.
InventorsTsuyoshi Nakamura, Yasuhiko Kitano, Yoshimitsu Ishihara, Shingo Maeda
Life of this patent
Estimating the term…
Abstract
A die set for press-forming a blank of thin metallic sheet. The die set has a punch and a blank holder. The blank holder has a first bead for restraining an edge of the blank with a constant force. The first bead is disposed further to an inside than a second bead for restraining the edge of the blank with a force that varies during pressing of the blank.
Claims4
A die set for press-forming a blank, comprising:
- a die having a concave part;
- a punch disposed in confronting relation to the die and having a convex part for penetrating into the concave part;
- and
- a blank holder disposed to surround the punch and having a first bead for restraining an edge of the blank with a constant force during pressing of the blank and a second bead, disposed further to an outside than the first bead, for restraining the blank edge with a force that varies during pressing of the blank.
1 more element
A method for press-forming a blank using a press-forming die set comprising:
- a die having a concave part;
- a punch disposed in confronting relation to the die and having a convex part for penetrating into the concave part;
- and a blank holder disposed to surround the punch and having a first bead for restraining an edge of the blank with a constant force during pressing of the blank and a second bead, disposed further to an outside than the first bead, for restraining the blank edge with a force that varies during pressing of the blank, the method comprising the steps of:
- forming while restraining the blank using the second bead that is controlled to an intermediate restraining force which is sufficient to prevent wrinkling from occurring during forming of the blank;
- forming while restraining the blank using the second bead that is controlled to a small restraining force which is smaller than the intermediate restraining force and that does not impede a flow of the blank into the concave part;
- and
- forming while restraining the blank using the second bead that is controlled to a large restraining force which is larger than the intermediate restraining force and which inhibits the blank from flowing into the concave part.
4 more elements
A die set for press-forming a blank, comprising:
- a die having a concave part;
- a punch disposed in confronting relation to the die and having a convex part for penetrating into the concave part;
- a first blank holder disposed to surround the die and having a first bead for restraining an edge of the blank with a constant force during pressing of the blank and a first holder surface, disposed adjacent to the first bead, for supporting the blank edge;
- a second blank holder disposed further to an outside than the first holder surface and having a second bead for restraining the blank edge with a force that varies during pressing of the blank and a second holder surface, disposed adjacent to the second bead, for supporting the blank edge;
- and
- a pad, disposed on the die, for elastically pushing on the second holder surface via the blank.
3 more elements
Dependencies are inferred from the claim text.