US 6,145,365 A · Method for forming a recess portion on a metal plate

Abstract

An object of the present invention is to provide a method for forming a recess portion having an predetermined shape on one side of a metal plate without giving the metal plate any remarkable stress while forming the other side flat, which is suitable for a package for electronic parts such as an integrated circuit, etc. The method according to the present invention is characterized in that a recess portion having an predetermined shape is formed by plastically deforming a metal plate having a predetermined thickness by means of a press, etc. so as to form the recess portion having a depth smaller than the thickness on one side thereof and to form at the same time a protruding portion protruding on the other side of the metal plate. In the steps of plastically deforming the metal plate, metal corresponding to the recess portion is displaced to the protruding portion. Then, the protruding portion on the other side is removed by cutting processing to form the recess portion only on the one side of the metal plate and to form the other side flat.

Claims16

Dependent claims

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;
and
repeatedly 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.

2 more elements

A method for forming a recess portion on a metal plate, said method comprising the steps of:

plastically deforming a metal plate in such a manner that a recess portion having a predefined shape with an outer perimeter is formed on a first side of the metal plate wherein, said deforming step causes a protruding portion to simultaneously be formed on a second side of the metal plate opposite the first side, the protruding portion being centered on the recess portion and having an outer perimeter analogous in shape to the outer perimeter of the recess portion and the outer perimeter of the protruding portion is smaller in size than the outer perimeter of the recess portion;
and
removing the protruding portion by cutting sections of the protruding portion away from the metal plate in a plurality of cutting steps.

Dependencies are inferred from the claim text.

Method for forming a recess portion on a metal plate

Life of this patent

Method for forming a recess portion on a metal plate

Life of this patent

Abstract

Claims16