Patent ID: 6571595
Filing Date: 2003-06-03
Classification: B21K,B23P,H01L

Abstract:
A method for making a package for supporting electronic parts, the package being made from a metal plate, said method comprising steps of:plastically deforming a part of the metal plate so as to form a recessed portion in a first side surface of the metal plate; simultaneously forming a first initial protruded portion on a second opposing side surface of the metal plate opposite from the first side surface of the metal plate by displacing a volume of metal corresponding to the recessed portion; cutting the first initial protruded portion in a regular direction after forming the first initial protruded portion; plastically deforming a part of the metal plate so as to make the recessed portion deeper in the first side surface of the metal plate; simultaneously forming a second protruded portion on the second side surface of the metal plate by displacing a volume of metal corresponding to the deeply recessed portion; cutting the second protruded portion in an opposing counter direction opposite to the regular direction after forming the second protruded portion; and repeatedly executing said plastically deforming step and the cutting step in alternating cutting directions until the recessed portion has a predetermined depth.