Metallic cover and method for making the same

• US 8,015,852 B2
• Filed: 02/01/2008
• Issued: 09/13/2011
• Est. Priority Date: 11/16/2007
• Status: Active Grant

• Current Assignee: Hong Fu Jin Precision Industry (Shenzhen) Co., Ltd. (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Hong Fu Jin Precision Industry (Shenzhen) Co., Ltd. (Hon Hai Precision Industry Co., Ltd.), Hon Hai Precision Industry Co., Ltd.
• Inventors: Su, Bao-Ping
• Primary Examiner(s): Tolan; Edward
• Assistant Examiner(s): Yusuf; Mohammad I
• Application Number:
  US12/012,298
• Publication Number:
  US 20090126450A1
• Time in Patent Office: 1,320 Days
• Field of Search: 72347-348, 723/56, 723/40, 723/700.3, 724/04, 724/050.1, 723/92, 723/84, 723/532, 723/792, 723/86, 413/8
• US Class Current: 72/348
• CPC Class Codes: H05K 5/03 Covers
• CPC Class Codes: H05K 5/04 Metal casings

Abstract

An exemplary metallic cover (20) includes a bottom base (21) and a side wall (22) extending from the bottom base. The side wall is formed by cold forging so that a thickness of the side wall is greater than that of the bottom base. A method for making the metallic cover described above, includes: drawing a metallic sheet into a preformed cover (30) having a bottom base (31) and a number of side walls (32); forging the preformed cover by a first forming die (200) to thicken the side walls; forging the preformed cover by a second forming die (300) to further thicken the side walls; and machining an end of each of the side walls of the preformed metallic cover to form the metallic cover.

Claims

1. 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.

2. The method as claimed in claim 1, wherein the first forming die comprises an upper die, a lower die, a pressing member, a punch, a first resilient member, and a second resilient member;

the lower die and the pressing member are disposed adjacent to and on opposite sides of the punch correspondingly;

the upper die is disposed above the lower die, the pressing member, and the punch; and

the first resilient member is disposed below the lower die, the second resilient member is disposed below the pressing member.

3. The method as claimed in claim 2, wherein the first resilient member and the second resilient member are both compression spring;

the punch, the lower die, and the pressing member cooperatively define a molding groove for receiving the side walls of the preformed metallic cover; and

a thickness of the molding groove is greater than the thickness of each of the side walls of the preformed metallic cover.

4. The method as claimed in claim 2, wherein the upper die comprises a working surface formed on a bottom surface thereof for pressing the bottom base of the preformed metallic cover;

the lower die comprises a mounting surface formed on a top surface thereof for mounting the preformed metallic cover; and

the pressing member comprises a side surface and an upper surface perpendicular to the side surface; and

an extending portion is formed on the side surface and is adjacent to the upper surface, the extending portion comprises a pressing surface for pressing the side walls of the preformed cover, and the pressing surface is perpendicular to the working surface of the upper die and parallel to the side surface.

5. The method as claimed in claim 2, wherein the punch of the first forming die comprises a punching portion having a first side surface, and a second side surface, the slanted working surface of the first forming die is formed at a distal end of the punch;

the first side surface is parallel to the second side surface, and the first side surface and the second side surface are on opposite sides of the punching portion correspondingly;

a ratio of a distance between the first side surface and the second side surface with respect to a thickness of sidewalls of the metallic cover is in a range from 0.7 to 0.9; and

the slanted working surface slants towards the first side surface, and an angle defined by the slanted working surface and the first side surface is in a range from 45 degrees to 70 degrees.

6. The method as claimed in claim 1, wherein the second forming die comprises an upper die, a lower die, a pressing member, a punch, a first resilient member, and a second resilient member;

the lower die and the pressing member are disposed adjacent to and on opposite sides of the punch correspondingly;

the upper die is disposed above the lower die, the pressing member, and the punch; and

the first resilient member is disposed below the lower die, the second resilient member is disposed below the pressing member.

7. The method as claimed in claim 6, wherein the first resilient member and the second resilient member are both springs;

the punch, the lower die, and the pressing member cooperatively define a molding groove for receiving the side walls of the preformed metallic cover; and

a thickness of the molding groove is greater than the thickness of the side walls of the preformed metallic cover.

8. The method as claimed in claim 6, wherein the upper die comprises a working surface formed on a bottom surface thereof for pressing the bottom base of the preformed metallic cover;

the lower die comprises a mounting surface formed on a top surface thereof for mounting the preformed metallic cover; and

the pressing member comprises a side surface and an upper surface perpendicular to the side surface; and

an extending portion is formed on the side surface and is adjacent to the upper surface, the extending portion comprises a pressing surface for pressing the side walls of the preformed cover, and the pressing surface is perpendicular to the working surface of the upper die and parallel to the side surface.

9. The method as claimed in claim 6, wherein the punch of the second forming die comprises a punching portion having a first side surface, and a second side surface, the slanted working surface of the second forming die is formed at a distal end of the punch;

the first side surface is parallel to the second side surface, and a distance between the first side surface and the second side surface equals to a thickness of the sidewalls of the metallic cover;

the slanted working surface slants towards the second side surface, and an angle defined by the slanted working surface and the first side surface is in a range from 45 degrees to 70 degrees.

10. The method as claimed in claim 2, further comprising a precision machining process before machining the end of each of the side walls of the preformed metallic cover, the sidewalls of the preformed metallic cover is processed by a precision forming die.

11. The method as claimed in claim 10, wherein the precision forming die comprises an upper die, a lower die, and a pressing plate;

the preformed metallic cover is fixed on the lower die by the pressing plate, the side walls of the preformed metallic cover extend out of the lower die, the upper die moves towards the lower die and a part of the side walls of the preformed metallic cover is cut off.