Patent ID: 6588244
Filing Date: 2003-07-08
Classification: B21D

Abstract:
Process for hydroforming sheet metal, comprising the steps of:fixing with the help of a blank holder (2â€², 2â€³, 2â€²â€³) a blank (1) to a matrix (4â€²) provided with a cavity (3â€²) for stamping said blank (1) with a die (5â€², 5â€³, 5â€²â€³) penetrating the matrix; and keeping the play between the die (5â€², 5â€³, 5â€²â€³) and the blank holder (2â€², 2â€³, 2â€²â€³) within a range of values preventing the formation of a fold between said die and matrix, as a function of fluid pressure in the cavity (3â€²) of the matrix (4â€²) during stamping.