Patent ID: 8015852

Claim:
A method for making a metallic cover, comprising: drawing a metallic sheet into a preformed cover having a bottom base and a plurality of side walls, and the bottom base and each of the sidewalls connected at a rounded edge; forging the preformed cover by a first forming die to thicken the side walls, the first forming die comprising a punch having a slanted working surface to form a first slanted pressing surface on a distal end of each of the side walls; forging the preformed cover by a second forming die to further thicken the side walls, the second forming die comprising a punch having a slanted working surface to form a second slanted pressing surface intersecting with the first slanted pressing surface on the distal end of each of the side walls, and the rounded edge of the preformed cover pressed into a beveled edge; and machining the end of each of the side walls of the preformed metallic cover to form the metallic cover.