Metal deforming – By use of closed-die and coacting work-forcer – Forcing work into or within closed die; e.g. – forging
Reexamination Certificate
1999-10-13
2001-02-20
Tolan, Ed (Department: 3725)
Metal deforming
By use of closed-die and coacting work-forcer
Forcing work into or within closed die; e.g., forging
C072S267000, C029S890030
Reexamination Certificate
active
06189363
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates generally to a cooling device, and more particularly to a molding tool for manufacturing the cooling device.
BACKGROUND OF THE INVENTION
As shown in
FIG. 1
, a prior art cooling device
1
is intended for use in a CPU (central processing unit) and is formed of a base
3
. The base
3
is provided with a plurality of cooling fins
4
. Now referring to
FIG. 2
, a prior art molding tool
7
is shown for manufacturing the cooling fins
8
by extrusion molding. In the process of making the cooling fins, the structural strength of the molding tool
7
must be taken into consideration in relation to the pressure of the extrusion molding. The ratio of height (H) and width (W) of the cooling fins
8
, as well as the distance (D) between the two cooling fins
8
must be kept in an appropriate range. If the cooling fins
8
are too thin, the molding tool
7
is susceptible to damage in the extrusion molding. If the cooling fins
8
are excessively thick, there will be less cooling fins
8
to result in a reduction in the cooling area.
SUMMARY OF THE INVENTION
The primary objective of the present invention is to provide a molding tool for manufacturing a cooling device having a plurality of cooling fins capable of removing heat effectively.
In keeping with the principle of the present invention, the foregoing objective of the present invention is attained by a molding tool comprising a lower mold, a lower mold housing, a punching head, and an urging plate. The lower mold is provided with a plurality of through holes. The lower mold housing is provided with a molding hole and is fixed on the lower mold such that the molding hole is corresponding in location to the through holes of the lower mold. The punching head is fastened with the bottom of the upper mold seat of a punching machine and is provided with a plurality of cavities and ribbed slots. The urging plate is provided with an opening and is disposed under the upper mold seat of the punching machine such that the punching head is put through the opening. The urging plate is further provided at the bottom thereof with an insertion slot extending along edge of the opening. A blank is first kept in the molding hole of the lower mold housing and is then extruded by the punching head to form a plurality of cooling fins in the through holes of the lower mold. The cavities and the ribbed slots are filled with the blank, so as to facilitate the releasing of the cooling fins from the molding tool.
REFERENCES:
patent: 4051708 (1977-10-01), Beane et al.
patent: 4706051 (1987-11-01), Dieleman et al.
patent: 4879891 (1989-11-01), Hinshaw
patent: 5937517 (1999-08-01), Smith et al.
patent: 2-205214 (1990-08-01), None
Browdy and Neimark
Tolan Ed
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