Device and method for forming by stamping at high speed

A method for deforming by stamping of a curved metal sheet, comprising the steps of:

• placing the curved metal sheet within a die of a forming device, the die is a predetermined shape substantially rotationally symmetrical about a longitudinal axis;
• placing a punch of the forming device inside the metal sheet, the punch is made of deformable and substantially non-compressible material and is rotationally symmetrical about the longitudinal axis;
• generating a magnetic field to impart to a hammer of the forming device, an axial speed greater than or equal to a minimum axial speed for obtaining a plastic deformation of the curved metal sheet;
• striking the hammer against the punch along the longitudinal axis;
• radially deforming the punch at a radial impact speed sufficient to obtain a plastic deformation of the curved metal sheet.

A device for forming by stamping a curved metal sheet, comprising:

• a punch made of deformable and substantially non-compressible material;
• a hammer configured to strike the punch along a longitudinal axis;
• a generator to generate a magnetic field configured to impart to the hammer an axial speed;
• a controller to impart and control the axial speed of the hammer to be greater than or equal to 20 m/s for obtaining a plastic deformation of the curved metal sheet;
• a die of predetermined shape substantially rotationally symmetrical about the longitudinal axis;
• and
• the punch is rotationally symmetrical about the longitudinal axis and configured to face the die such that the punch has a non-zero predetermined distance between the curved metal sheet and the die.