Patent ID: 6145365
Filing Date: 2000-11-14
Classification: B21K,B23P,H01L,H05K

Abstract:
A method for forming a recess portion on a metal plate comprising steps of:plastically deforming a section of a metal plate in such manner that a recess portion is formed on a first side of the metal plate;simultaneously forming a protruding portion on a second side of the metal plate that is opposite the first side by displacing a volume of metal corresponding to the recess portion;removing said protruding portion of the metal plate by cutting the protruding portion away from the metal plate; andrepeatedly performing said step of plastically deforming the section of the metal plate subjected to the initial deforming step while simultaneously performing said step of forming the protruding portion until the recess portion defines a predetermined shape and repeatedly performing the step of removing the protruding portion.