Patent ID: 6708542
Filing Date: 2004-03-23
Classification: B21D,B23D,B26D,B26F,Y10S,Y10T

Abstract:
A method for forming a metal plate (306, 436) comprising:(a) providing a mold having an overall annular shape and a forming plane, which in operation faces the plate and which has rounded edges; (b) placing the metal plate against said forming plane; (c) by means of a rapid and intense electric current pulse discharged from a capacitor battery of a power source generating an abrupt and intense force and applying it onto said plate to force it towards said mold, whereby said plate is formed to assume a 3-D shape corresponding to contours of the mold while edged portions of the plate being bent about said rounded edges; and (d) applying through an auxiliary pulsed magnetic force (PMF) device with an auxiliary forming coil, a PMF force onto said edge portion in a direction which is essentially normal to said edge portion against a shearing line defined between a face having said edged portion and a wall portion normal thereto, whereby said edge portion is cut along said shearing line.