Heat exchange – With retainer for removable article – Electrical component
Reexamination Certificate
2000-05-31
2001-08-28
Flanigan, Allen (Department: 3743)
Heat exchange
With retainer for removable article
Electrical component
C165S185000, C165S301000, C165SDIG119, C165S091000, C165SDIG119, C165SDIG119, C165SDIG119
Reexamination Certificate
active
06279648
ABSTRACT:
The invention relates to a method of manufacturing cooling devices consisting of a plurality of shaped-section part elements made from metal, by which grooves and beads formed on the shaped-section part elements are plugged into each other and joined in the transverse direction by application of pressure.
Cooling devices intended for mounting on semiconductor components are known in the form of hollow chambers with inserted cooling ribs, which permit flow-through in the longitudinal direction and consist of two extruded, about U-shaped shaped-section part elements made of aluminum. The outer section walls of such elements engage each other in each case like a groove and a spring. A groove is shaped by molding in each case on one of said section walls of a shaped-section part element, and a bead on the wall of the other shaped-section part element. However, the two shaped-section part elements, which are preferably identical, are actually joined with one another via bridge-like cooling ribs having hollow chambers. With their suitably designed, approximately U-shaped ends, such cooling ribs are fitted in matching grooves on the inner sides of the shaped-section part elements and locked in place in said grooves by application of pressing pressure as required. However, due to the high pressing pressure required for this purpose it is not possible in practical life to manufacture such cooling devices. by the described method with adequately long lengths. Consequently only relatively short cooling device units can be manufactured in the form of shaped-section part elements, which makes the cooling devices produced by said method relatively expensive.
Processes for producing semi-open cooling devices are known from both DE-PS 25 02 472 and DE-PS 35 18 310, in which the cooling ribs are retained on a base plate pressed into matching receiving grooves. Roller-like pressing dies are employed in said processes for acting on the intermediate bridges on the base plate between the individual cooling ribs, forcing material into adjacent rib spaces on the cooling ribs. However, only semi-open cooling devices can be manufactured in this way. Because of the type of mounting employed it is not possible to produce the spacings between the cooling ribs with any desired narrowness.
A process for manufacturing cooling devices—which are semi-open as well—is known from DE-PS 34 15 554, in which metal shaped-section part elements with an approximately T-shaped cross section are joined by plugging with grooves and bridges shaped by molding on or in the head bridge, and each plug connection is fixed by cold welding in the direction transverse relative to said joint. Such cold welding, however, required very high pressing pressures, which with conventional dies can be applied to only relatively short lengths. During cold welding, an atomic convergence of the surfaces contacting each other takes place due to the high contact pressure. The relative motion or surface enlargement occurring in this process on the lines of separation destroys the oxide skin, as a rule, and permits a welded connection. In the manufacture of such cooling devices, however, the high pressing pressures require additional inner support, which can be realized only with semi-open cooling devices, to begin with. Inner cooling were found to be disadvantageous in this connection, as such ribs make accessibility for the support more difficult.
The problem of the invention is to propose a process for the manufacture of cooling devices preferably of the hollow section construction, but also with the semi-open construction, by which cooling devices with good thermal conductivity, adequate torsional strength and strength can be manufactured at low cost. Furthermore, the problem of the invention is to propose shaped-section part elements for such manufacture, as well as cooling devices produced by the process.
The problem of the invention is solved by a method according to claim
1
. Claims
2
and
3
propose suitable molding methods permitting also plastic deformation of the outwardly protruding or projecting groove walls. Different structural heights of cooling devices can be realized with a small number of different shaped-section part elements belonging, however, to the same system family.
It is possible by such a method as defined by the invention to manufacture cooling devices or strands of cooling devices of a very great length with relatively low expenditure in terms of production engineering. If need be, such strands can be divided in shorter segments. The shaped-section part elements required at the same are at least partly fixed against each other already during mounting, so that additional holding devices can be omitted. Following mounting of the shaped-section part elements against each other, molding or deformation of the outwardly projecting groove walls takes place on the connection sides of the cooling devices or strands of cooling devices, which leads to a very intimate and mechanically strong connection with the adjacent beads of the corresponding shaped-section part elements, such connection promoting the passage of heat. This connection technique, which is applicable to both closed and semi-open cooling devices, does not influence the type and the arrangement of the inner cooling ribs, so that their design is freely selectable at least under this aspect.
Shaped-section part elements with the features of claims
4
to
6
are suitable in a particularly favorable way for carrying out the method as defined by the invention. With such embodiments of the shaped-section elements, a particularly intimate positive clamping of two beads in a site of connection is obtained within the zone of their points of connection following mounting and molding. Both the shaped-section elements according to claims
4
to
6
and
10
and also shaped-section elements according to claim
11
can be manufactured in a simple way as extruded sections made from aluminum alloys.
With cooling devices according to claims
7
and
8
, possible bending of their contact surfaces, which have to be smooth and plane, is avoided.
With shaped-section part elements according to claims
9
and
10
it is possible to manufacture hollow cooling devices in which the walls of the shaped-section part elements serving for the connection, following a smoothing treatment, form the contact surface for mounting thereon a semiconductor component. The heat conduction is promoted in such a cooling device because the currents of heat pass through the outer wall segments of the shaped-section element disposed perpendicular to the contact area, and through the wall segments of the shaped-section element disposed parallel with said area.
REFERENCES:
patent: 3517472 (1970-06-01), Toth
patent: 3735465 (1973-05-01), Tibbetts et al.
patent: 5042257 (1991-08-01), Kendrick et al.
patent: 5193498 (1993-03-01), Futami
patent: 5282364 (1994-02-01), Cech
patent: 5689873 (1997-11-01), Luhm
patent: 5912802 (1999-06-01), Nelson
patent: 34 15 554 (1984-10-01), None
patent: 35 18 310 (1986-11-01), None
patent: 93 15 056 (1994-02-01), None
patent: 94 09 517 (1994-09-01), None
patent: 94 12 818 (1994-12-01), None
patent: 295 20 474 U (1996-04-01), None
patent: 0 335 589 (1989-10-01), None
Bayer Joachim
Bockholt-Bayer Martina
Diels Manfred
Bockholt-Bayer Martina
Collard & Roe P.C.
Diels Manfred
Flanigan Allen
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