Method and apparatus for sheet forming a blank using a variable bead
First Claim
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1. A method for sheet forming a blank using at least one variable point bead comprising the following steps of:
- holding said blank between a blank holder and an opposing die so that wrinkling is essentially prevented in said blank;
forming said blank to an objective shape with a punch; and
selectively imposing separate individual point-like bead forces on said blank at selected positions through one or more variable point beads and only during a partial time period of said forming step,wherein said variable point beads are not line beads.
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Abstract
A sheet forming method including the steps of: holding a blank between a blank holder and an opposing die so that wrinkling is prevented in the blank; and forming the blank to an objective shape with a punch, while imposing a force of a variable bead on the blank at a selected position in a point manner and only during a part of the entire forming period selectively. An apparatus for conducting the above method.
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Citations
23 Claims
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1. A method for sheet forming a blank using at least one variable point bead comprising the following steps of:
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holding said blank between a blank holder and an opposing die so that wrinkling is essentially prevented in said blank; forming said blank to an objective shape with a punch; and selectively imposing separate individual point-like bead forces on said blank at selected positions through one or more variable point beads and only during a partial time period of said forming step, wherein said variable point beads are not line beads. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 16)
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12. An apparatus for sheet forming a blank using at least one variable point bead comprising:
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a blank holder and an opposing die for holding said blank therebetween so that wrinkling is essentially prevented in said blank; a punch for forming said blank to an objective shape; and one or more variable point beads for selectively imposing separate individual point-like bead forces on selected portions of said blank and during only a part of an entire forming time period, wherein said variable point beads are not line beads. - View Dependent Claims (13, 14, 15, 17, 18, 19, 20, 21, 22, 23)
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Specification