| 摘要 |
A process for hydroforming sheet metal, in which a blank (1) is secured with the help of a blank holder (2', 2'', 2''') on a matrix (4') provided with a cavity (3') for stamping the blank (1) with the help of a die (5', 5'', 5''') entering the matrix, characterized in that during the stamping phase, the play between the die (5', 5'', 5''') and the blank holder (2', 2'', 2''') is confined within a range of values preventing, between the die and matrix, the formation of a fold, as a function of one and/or the other of the following parameters: pressure of fluid in the cavity (3') of the matrix (4'), and position of the die (5', 5'', 5''') relative to the matrix.
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