Metal fusion bonding – Including means to force or clamp work portions together...
Reexamination Certificate
1999-05-11
2001-05-01
Evans, Geoffrey S. (Department: 1725)
Metal fusion bonding
Including means to force or clamp work portions together...
C228S051000
Reexamination Certificate
active
06223970
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a die set for welding fins and a base plate of a heat sink, it is used to complete fixing of the U shaped fins and the base plate of the heat sink by welding. It has the object to increase heat-sinking efficiency and to render the welding process to finish quickly.
2. Description of the Prior Art
Conventional heat sinks are all made of aluminum by virtue that aluminum has high heat conduction efficiency and low cost of material. The structure of such a conventional heat sink is shown in
FIG. 1
, and is comprised of a base plate
1
and a plurality of heat sinking fins
2
provided on the top of the base plate
1
. Wherein, the bottom of the base plate
1
is mounted on the top surface of an appliance
3
to be processed for heat sinking. While the heat sinking fins
2
are mounted above the base plate
1
in order to fast transmit the heat with high temperature absorbed by the base plate
1
to each heat sinking fin
2
. Then by convection of the heat sinking fins
2
with cool air, the high temperature on the appliance
3
can be reduced.
When in manufacturing of a conventional heat sink, extrusion process is always used to integrally make it by virtue that aluminum has high ductility and low melting point. However, the conventional heat sink made by extrusion process has the defect that the heat sinking fins in the extrusion process are supposed not to be too thin, and the distance between every two fins shall not be too short. Otherwise, material supply for the fins in the extrusion process will be sometimes smooth and sometimes intermittent. Therefore, amount of the heat sinking fins is limited, and heat sinking area will be reduced. On the contrary, thicker fins cost higher, and are heavier; they are not good for computers which develop very fast nowadays.
In view of the above mentioned defects of the extrusion process for heat sinks, one kind of heat sink as shown in
FIG. 2 and 3
has been developed in the art. Construction of the heat sink includes serially bending a plurality of heat sinking fins
20
to form a plurality of U shaped bends; the bottom surfaces of the bends are plain. A base plate
10
provided for the heat sinking fins
20
is in the form of a plain plate. The plain bottom surfaces of the bends are placed on and stuck to the top surface of the base plate
10
; and assembling of the heat sink is completed.
Such a heat sink which is combined from the base plate
10
and the heat sinking fins
20
manufactured separately forms a structure having serial U shaped bends, thereby the thickness of the heat sinking fins
20
can be reduced. And the effects of heat conducting and heat sinking can thus be better; this can exactly overcome the defects of the first mentioned conventional heat sinks made integrally. However, there is no appropriate equipment or tool for constructing such a combined heat sink from the base plate
10
and the heat sinking fins
20
. Only glue is applied in advance at the areas where the base plate
10
and the heat sinking fins
20
are to be combined mutually. This is inconvenient for automatic production. Evidently, glue especially adversely influences the heat conducting effect between these two parts.
SUMMARY OF THE INVENTION
In view of this, the inventor of the present invention provides a die set for welding fins and the base plate of a heat sink based upon his professional and doctoral knowledge (from Ohio State University) of manufacturing engineering and practical experience of years in study, designing and development of the structure of such a combined heat sink. Such a die set can solve the problems resided in constructing as well as manufacturing of a heat sink.
Particularly, the die set for welding fins and the base plate of a heat sink is comprised mainly of a first die seat and a second die seat. Wherein, the first die seat is disposed beneath the base plate of the heat sink to support the latter. While the second die seat is disposed above the U shaped heat sinking fins, and is comprised of a pressing portion and a connecting portion. The pressing portion is provided in corresponding to the lower bends of the U shaped heat sinking fins with pressing bars. The connecting portion having a plurality of connecting ends is provided on the bottoms of the pressing bars to supply energy to generate large heat. When the pressing portion exerts force on the pressing bars, the U shaped heat sinking fins are pressed against the top of the base plate and are quickly welded thereto by the large heat produced by the connecting portion.
The primary object of the present invention is to provide a die set for welding process capable of increasing heat-sinking effect of a heat sink. After the U shaped heat sinking fins and the base plate of the heat sink are combined with the welding die set; there is no medium between them. Therefore, the large heat absorbed by the base plate can be transmitted very fast to the U shaped heat sinking fins, and thus heat sinking effect of the heat sink can be increased.
The secondary object of the present invention is to provide a die set for welding process capable of reducing cost of a heat sink by fast production. By providing the structure of the die set, multiple die sets can be provided on a production line. Welding process of each heat sink needs only two seconds to complete combining. This is good for automatic mass production, and therefore can lower cost of production.
The present invention will be apparent in its particular structure and effects after reading the detailed description of the preferred embodiments thereof in reference to the accompanying drawings.
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patent: 5199164 (1993-04-01), Kim et al.
patent: 5358032 (1994-10-01), Arai et al.
patent: 5421406 (1995-06-01), Furusawa et al.
patent: 5548482 (1996-08-01), Hatauchi et al.
patent: 5625229 (1997-04-01), Kojima et al.
patent: 5726495 (1998-03-01), Aihara et al.
patent: 5771966 (1998-06-01), Jacoby
patent: 5894882 (1999-04-01), Kikuchi et al.
patent: 5912802 (1999-06-01), Nelson
Bacon & Thomas
Evans Geoffrey S.
Stoner Kiley
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