Method of forming heat dissipating fins

• US 6,000,132 A
• Filed: 12/01/1997
• Issued: 12/14/1999
• Est. Priority Date: 12/01/1997
• Status: Expired due to Term

• Current Assignee: R-Theta Thermal Solutions, Inc. (Mersen SA)
• Original Assignee: R-Theta Inc.
• Inventors: Butler, James R. S.
• Primary Examiner(s): ROSENBAUM, IRENE CUDA
• Application Number:
  US08/980,592
• Time in Patent Office: 743 Days
• Field of Search: 165/80.3, 165/185, 174/16.3, 257/722, 361/704, 361/703, 29/890.03, 29/521, 29/505, 29/557
• US Class Current: 29/890.03
• CPC Class Codes: B23P 15/26 heat exchangers or the like making heat exchangers by methods covered by other subclasses B21D53/02
• CPC Class Codes: B23P 2700/10 Heat sinks
• CPC Class Codes: H01L 21/4882 Assembly of heatsink parts
• CPC Class Codes: H01L 23/3672 Foil-like cooling fins or heat sinks being part of lead-frames H01L23/49568
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• CPC Class Codes: Y10T 29/4935 Heat exchanger or boiler making
• CPC Class Codes: Y10T 29/49936 Surface interlocking
• CPC Class Codes: Y10T 29/49995 Shaping one-piece blank by removing material

Abstract

A method of fabricating a heat sink, including the steps of providing a base plate having a plurality of grooves therein, providing a plurality of blanks each having bell-bottom shaped foot portions on opposite sides thereof, separating each blank into a pair of mirror image heat fin portions, each of the heat fin portions having one of the bell-bottom shaped foot portions and a plurality of tongues projecting therefrom, positioning the heat sink fin portions with the bell-bottom shaped foot portions in respective ones of the grooves of the base plate, and swaging the bell-bottom shaped foot portions into the grooves, thereby creating the heat sink with the tongues projecting from the base plate.

Claims

1. A method of fabricating a heat sink, comprising the steps of:

a) providing a base plate having a plurality of grooves therein;

b) providing a plurality of blanks each having bell-bottom shaped foot portions on opposite sides thereof;

c) separating each said blank into a pair of mirror image heat fin portions, each of said heat fin portions having one of said bell-bottom shaped foot portions and a plurality of tongues projecting therefrom;

d) positioning said heat sink fin portions with said bell-bottom shaped foot portions in respective ones of said grooves of said base plate; and

e) swaging said bell-bottom shaped foot portions into said grooves, thereby creating said heat sink with said tongues projecting from said base plate.

2. The method of claim 1, wherein said step of providing said base plate further comprises extruding said base plate with said grooves therein from a heat conductive metal.

3. The method of claim 1, wherein said step of providing said plurality of blanks further comprises extruding said blanks with said bell-bottom shaped foot portions thereon from a heat conductive metal.

4. The method of claim 1, wherein said step of separating each said blank into said pair of mirror image heat fin portions further comprises one of either shearing or punching said blank along a crenellated scribe line.

5. The method of claim 1, wherein said heat sink fins are positioned such that successive ones of said tongues projecting from said base plate are aligned.

6. The method of claim 1, wherein said heat sink fins are positioned such that successive ones of said tongues projecting from said base plate are offset.