Punching and riveting assembly of a heat dissipater and heat conducting tubes

Abstract

A method for punching heat dissipating tubes to fins comprises the steps of arranging a plurality of heat dissipating fins in parallel; aligning the via holes of the fins; inserting a plurality of heat dissipating tubes into the through holes formed by the via holes; inserting a plurality of press rods into the recesses of the via holes; positioning the fins upon a fixture; using a plurality of punching plates to impact the press rods to further impact the heat dissipating tubes so that the heat dissipating tubes are clamped tightly by the walls of the via holes; and drawing out the press rods from the recesses. In another case, the press rods can be removed and the recesses are made to extend to the edges of the fins and the punching plates punches the heat dissipating tubes directly.

Description

FIELD OF THE INVENTION

The present invention relates to heat dissipation, and in particular to a method for punching heat dissipating tubes to fins and the device formed by the method, wherein oil is removed after shaping of the fins and thus it is not affected the punching process. Thereby the punching is completed to all the fins so that the punching times are reduced and the fins and heat dissipating tubes will not be destroyed.

BACKGROUND OF THE INVENTION

One prior art about the heat dissipation of central processing unit is formed by a plurality of fins. Heat of the fins are dissipated by flowing air into the fins.

In another prior art, a plurality of heat dissipating tubes are installed into the fins. This prior art is used to a compact space which is not suitable for installing with a fan.

In one prior art, the welding material is used to combine the heat dissipating tube to the wall of the via hole of the fin and then they are placed in a vacuum oven for heating so that welding material will permeate into the gaps between the heat dissipating tubes and the via holes. However the cost of the oven is high and time period is long so that the yield rate is low. Furthermore, the welding material will pollute the environment and harm human bodies.

With reference to FIG. 1, a prior art is illustrated. Each fin 10 has a plurality of via holes 12 and then the heat dissipating tubes 11 are placed into the via holes 12. Each time only one fin 10 is installed with the heat dissipating tubes 11. The fin 10 is punched so as to tighten the heat dissipating tubes 11 to the via holes 12. Then another fin is installed with the heat dissipating tubes 11 and the process is repeated.

However the punching process will generate gaps between the heat dissipating tubes 11 and the via holes 12, see FIG. 2. The yield ratio is low and the heat dissipation from the heat dissipating tube 11 to the fin 10 is affected. The punching process is performed one by one, and thus the punching process will destroy the fins and heat dissipating tubes.

Furthermore, in the punching process, oil is added between the heat dissipating tubes and the walls of the via holes. The oil will permeate into the combining surfaces so that the material of the heat dissipating tubes will oxidize to increase the heat resistance of the combining surface and the heat dissipation ability is reduced.

SUMMARY OF THE INVENTION

Accordingly, the primary object of the present invention is to provide a method for punching heat dissipating tubes to fins and the device formed by the method, wherein the oil is removed after shaping of the fins and thus it is not affected the punching process. Thereby the punching is completed to all the fins so that the punching times are less and the fins and heat dissipating tubes will not be destroyed.

To achieve above objects, the present invention provides a method for punching heat dissipating tubes to fins comprising the steps of: arranging a plurality of heat dissipating fins in parallel; wherein each of the fin having a plurality of via holes; each via hole having a respective slot; each via hole having an annular wall protruded from the respective fin; aligning the via holes of the fins so that the plurality of fins are formed with a plurality of through holes formed by via holes at the same positions of the fins; inserting a plurality of heat dissipating tubes into the through holes formed by the via holes; wherein each via hole only receives one heat dissipating tube; a size of each heat dissipating tube is smaller than that of each via hole so that a gap is formed between the heat dissipating tube and the respective via hole; inserting a plurality of press rods into the recesses of the via holes; positioning the fins upon a fixture; using a plurality of punching plates to impact the press rods to further impact the heat dissipating tubes so that the heat dissipating tubes will collide the walls of the via holes so as to deform and then the heat dissipating tubes are clamped tightly by the walls of the via holes and the contact areas between the walls of the via holes and the outer walls of the heat dissipating tubes are enlarged so that the heat dissipation of the fins are increased; and drawing out the press rods from the recesses.

In another embodiment, the recesses can be extended to edge of the fins and no press rod is used. The punching plates punch the heat dissipating tubes directly so that the heat dissipating tubes are deformed to tightly engage with the walls of the via holes.

The various objects and advantages of the present invention will be more readily understood from the following detailed description when read in conjunction with the appended drawing.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic view of the prior art fins.

FIG. 2 is an elevational view of the first embodiment of the present invention.

FIG. 3 is an exploded perspective view of the present invention.

FIG. 4 is a schematic view showing the assembly of the present invention.

FIG. 5 is a schematic view showing the impacting process of the present invention.

FIG. 6 is a schematic view showing the state of the present invention after impacting process.

FIG. 7 is an assembly view of the present invention.

FIG. 8 is an exploded perspective view of another embodiment of the present invention.

FIG. 9 is a schematic view about the embodiment in FIG. 8.

FIG. 10 is a schematic view showing the punching process in the second embodiment of the present invention.

FIG. 11 is a schematic view showing the structure of the present invention.

FIG. 12 is a perspective view of the second embodiment of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

In order that those skilled in the art can further understand the present invention, a description will be described in the following in details. However, these descriptions and the appended drawings are only used to cause those skilled in the art to understand the objects, features, and characteristics of the present invention, but not to be used to confine the scope and spirit of the present invention defined in the appended claims.

With reference to FIGS. 3 to 5, the structure of the present invention is illustrated.

A plurality of heat dissipating fins 20 are arranged in parallel. Each of the fin 20 has a plurality of via holes 21. Each via hole 21 has a slot 22. Each via hole 21 has an annular wall 23 protruded from the respective fin 20 so as to increase the clamping force of the via holes 21.

The via holes 21 of the fins 20 are aligned so that the plurality of fins 20 are formed with a plurality of through holes.

A plurality of heat dissipating tubes 3 insert into the through holes formed by the via holes 21. Each via hole 21 only receives one heat dissipating tube 3. A size of each heat dissipating tube 3 is smaller than that of each via hole 21 so that a gap S1 is formed between the heat dissipating tube 3 and the respective via hole 21.

A plurality of press rods 4 are inserted into the recesses 22 of the via holes 21, as illustrated in FIG. 5.

The fins 20 are positioned upon a fixture 5.

Then a plurality of punching plates 6 are used to impact the press rods 4 to further impact the heat dissipating tubes 3. The heat dissipating tubes 3 will collide the walls of the via holes 21 so as to deform and then the heat dissipating tubes 3 are clamped tightly by the walls of the via holes 21. Moreover the contact areas between the walls of the via holes 21 and the outer walls of the heat dissipating tubes 3 are enlarged so that the heat dissipation of the fins are increased.

After the punching process, the press rods 4 are drew out so as to complete the process, see FIG. 7.

Referring to FIGS. 8 and 9, another embodiment of the present invention is illustrated.

A plurality of heat dissipating fins 20a are arranged in parallel. Each of the fin 20a has a plurality of via holes 21a. Each via hole 21a has a slot 22a. Each slot 22a is extended to one edge of the respective fin 20. Each via hole 21a has an annular wall 23 protruded from the respective fin 20.

The via holes 21a of the fins 20 are aligned so that the plurality of fins 20 are formed with a plurality of through holes.

A plurality of heat dissipating tubes 3 insert into the through holes formed by the via holes 21a. Each via hole 21a only receives one heat dissipating tube 3. A size of each heat dissipating tube 3 is smaller than that of each via hole 21a so that a gap is formed between the heat dissipating tube 3 and the respective via hole 21a.

The fins 20 are positioned upon a fixture 5.

Then a plurality of punching plates 6 are used to impact the heat dissipating tubes 3 through the slots 22a. The heat dissipating tubes 3 will collide the walls of the via holes 21 so as to deform and then the heat dissipating tubes 3 are clamped tightly by the walls of the via holes 21. Moreover the contact areas between the walls of the via holes 21 and the outer walls of the heat dissipating tubes 3 are enlarged so that the heat dissipation of the fins are increased.

The present invention is thus described, it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the present invention, and all such modifications as would be obvious to one skilled in the art are intended to be included within the scope of the following claims.

Claims

1. A method for punching heat dissipating tubes to fins comprising the steps of:

arranging a plurality of heat dissipating fins in parallel; wherein each of the fin having a plurality of via holes; each via hole having a respective slot; each via hole having an annular wall protruded from the respective fin;

aligning the via holes of the fins so that the plurality of fins are formed with a plurality of through holes formed by via holes at the same positions of the fins;

inserting a plurality of heat dissipating tubes into the through holes formed by the via holes; wherein each via hole only receives one heat dissipating tube; a size of each heat dissipating tube is smaller than that of each via hole so that a gap is formed between the heat dissipating tube and the respective via hole;

inserting a plurality of press rods into the recesses of the via holes;

positioning the fins upon a fixture;

using a plurality of punching plates to impact the press rods to further impact the heat dissipating tubes so that the heat dissipating tubes will collide the walls of the via holes to deform and then the heat dissipating tubes are clamped tightly by the walls of the via holes and the contact areas between the walls of the via holes and the outer walls of the heat dissipating tubes are enlarged so that the heat dissipation of the fins are increased; and

drawing out the press rods from the recesses.

2. The method of claim 1, wherein each via hole has an annular wall protruded from the respective fin to increase the clamping force of the via holes to the heat dissipating tubes.

3. A heat dissipating device comprising:

a plurality of heat dissipating fins arranged in parallel; each of the fin having a plurality of via holes; each via hole having a slot; each via hole having an annular wall protruded from the respective fin so as to increase the clamping force of the via holes to the heat dissipating tubes; the via holes of the fins being aligned so that the plurality of fins being formed with a plurality of through holes;

a plurality of heat dissipating tubes located in the through holes formed by the via holes; each via hole only receives one heat dissipating tube; a size of each heat dissipating tube being smaller than that of each via hole; wherein the heat dissipating tubes are tightly engaged in the via holes by punching.

4. A method for punching heat dissipating tubes to fins comprising the steps of:

a plurality of heat dissipating fins arranged in parallel; wherein each of the fin has a plurality of via holes; each via hole has a slot; each slot is extended to one edge of the respective fin; each via hole has an annular wall protruded from the respective fin;

aligning the via holes of the fins aligned so that the plurality of fins are formed with a plurality of through holes;

inserting a plurality of heat dissipating tubes into the through holes formed by the via holes; each via hole only receiving one heat dissipating tube; wherein a size of each heat dissipating tube is smaller than that of each via hole so that a gap is formed between the heat dissipating tube and the respective via hole;

positioning the fins upon a fixture.

using a plurality of punching plates to impact the heat dissipating tubes through the slots; the heat dissipating tubes will collide the walls of the via holes so as to deform and then the heat dissipating tubes are clamped tightly by the walls of the via holes; moreover the contact areas between the walls of the via holes and the outer walls of the heat dissipating tubes are enlarged so that the heat dissipation of the fins are increased.