Patent ID: 7971464
Filing Date: 2011-07-05
Classification: B21C,B21D,Y10T

Abstract:
1. A method of manufacturing a small-sized electronic casing, the method comprising: extruding an aluminum alloy to form an extruded shape of a prescribed length, the extruded shape including a flat and hollow section having spaced, opposing flat side walls defining a central hollow, one of the flat side walls having an exterior surface extending across the width of the extruded shape, with ribs extending along opposing edges of the one flat side wall and extending outwardly, curving in a circular arc, from the respective opposing edges, toward each other, to free tip ends facing each other; and press punching component-mounting notches in the ribs by inserting a core, serving as a die, into the hollow section of the extruded shape, in contact with the inner surface of the hollow section; and wherein the extruded shape is constrained in a longitudinal direction by pressing the extruded shape against the core with a press member from one direction orthogonal to the longitudinal direction of the extruded shape and to a punching direction.