Patent ID: 9630230
Date: 2017-04-25
CPC Classifications: B21C,B21D,B21J,B30B

Claim:
1. 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 a minimum axial speed 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.