WO2014029066A1 - Pure aluminium/copper radiator, production method thereof and production mould therefor - Google Patents

Abstract

Disclosed is a pure aluminium/copper radiator, comprising a base (11) and heat dissipation pipes (12), with the base and the heat dissipation pipes being integrated together; further disclosed is a method for producing the pure aluminium/copper radiator, wherein the base (11) and the heat dissipation pipes (12) are integrally formed by stamping and stretching pure aluminium/copper blanks; and further disclosed is a production mould for producing the pure aluminium/copper radiator, the mould comprising an upper mould (21) and a lower mould (22), with the lower mould being provided with segmented holes formed with different diameters(23). The pure aluminium/copper radiator has advantages of a good heat dissipation effect, a simple production method, and an artful mould design.

Description

 Pure aluminum/pure copper radiator, production method thereof and production mold

Technical field

The invention relates to the field of heat sinks.

Background technique

Electronic components, such as LED modules, generate more heat during operation, which requires the installation of a heat sink to transfer and dissipate heat in a timely manner. Ordinary heat sinks are mostly base and fin structures. The base is used to contact the heat source. The fins are used to increase the surface area and increase the heat dissipation efficiency. However, the heat dissipation effect of this conventional heat sink structure is not very satisfactory. The constraints here include the material of the heat sink itself, as well as the structure and processing difficulty of the heat sink.

At present, the heat sinks on the market are produced by processes such as die casting or extrusion stretching. These processes require heating to form, although pure aluminum/pure copper is a good thermal conductive material, but because they are highly viscous after heating, The mold will be stuck, so pure aluminum or pure copper cannot be used as the heat sink material in the prior art.

Now there is a new type of radiator design concept, which uses a base and chimney-like heat pipe, and a structure with fins attached to the heat pipe. Since the heat pipe can generate a chimney effect, the heat is dissipated more quickly, so the heat dissipation effect is In theory it is very good. However, due to the limitation of the manufacturing process, it can not make the shape of small base and multi-tube arrangement in actual production, and can not integrate the heat-dissipating tube with the base, and it is not preferable to use pure aluminum/pure copper as the soft metal and high thermal conductivity. Sexual materials to make. Combined with the above-mentioned material heat processing production difficulty, it can be known that there is no suitable production process and production mold in the market to actually produce such a chimney tube type radiator.

Summary of the invention

The object of the present invention is to provide a pure aluminum/pure copper heat sink with excellent heat dissipation effect, and a supporting production method of the pure aluminum/pure copper heat sink, and a production mold used in the method.

The solution to solve the technical problem of the present invention is:

(1) The present invention provides a pure aluminum/pure copper heat sink comprising a base, at least one heat pipe is disposed on one side of the base, one end of the heat pipe is connected to the base, and the pipe body is perpendicular to the base The inner hole of the tube penetrates through the base; the base and the heat dissipation tube are the same whole, and the whole is a pure aluminum/pure copper member.

As a further improvement of the above technical solution, a plurality of fins are disposed on the outer wall of the heat dissipation tube, and the fins extend along the tube body; the base, the heat dissipation tube and the fin are the same whole, and the whole is a pure aluminum/pure copper member. .

As a further improvement of the above technical solution, the heat pipe has a rectangular cross section, and the plurality of heat pipes are disposed on the base in parallel with each other.

(2) The present invention further provides a method for producing a pure aluminum/pure copper heat sink, comprising the following steps:

 1) making a pure aluminum/pure copper ingot, the pure aluminum/pure copper ingot comprising a base prototype having at least one boss on one side of the base shape;

2) punching the pure aluminum/pure copper billet, the hole starts from the top end of the boss, and vertically penetrates the boss and the base shape, so that the boss is formed into a prototype heat pipe;

 3) The actual size of the heat pipe of the pure aluminum/pure copper heat sink is drawn by drawing the prototype heat pipe.

As a further improvement of the above technical solution, in the step 3), a plurality of fins extending in the direction of the tube body are formed on the outer wall of the heat dissipation tube while punching and stretching the heat dissipation tube.

As a further improvement of the above technical solution, the press stretching in the step 3) is a cold stamping drawing.

(3) The present invention also provides a production mold of a pure aluminum/pure copper heat sink, comprising an upper mold and a lower mold; the upper surface of the lower mold is provided with at least one vertical molding hole, and the molding hole is axially The variable diameter is divided into three sections: the upper section, the transition section and the lower section. The upper section has a larger aperture than the lower section, and the transition section has a funnel shape which is gradually narrowed, and connects the upper section and the lower section; the lower surface of the upper mold is provided with a fixing jig, which is aligned with the forming hole. .

As a further improvement of the above technical solution, the inner wall of the lower hole is provided with a plurality of sharp ribs distributed around the central axis of the forming hole.

As a further improvement of the above technical solution, the transition angle of the transition section is 27°.

As a further improvement of the above technical solution, the holes of the upper section are rounded.

As a further improvement of the above technical solution, the upper mold is divided into upper and lower layers, the fixing jig is disposed on the lower layer, and a buffer device is disposed between the upper layer and the lower layer.

As a further improvement of the above technical solution, the lower mold is divided into an inner portion and an outer portion, and the outer portion is divided into a fixed base, and a central hole is opened in the fixed base for the inner portion to be inserted; the inner portion includes a plurality of vertical flaps A sub-mold that encloses the shaped hole.

Specifically, the production mold according to the present invention described above can be used to produce the pure aluminum/pure copper radiator provided by the present invention in accordance with the production method provided by the present invention.

The invention has the beneficial effects that the pure aluminum/pure copper radiator in the invention has a heat dissipating tube, can simultaneously exert the chimney effect of air convection and increase the heat dissipating area, and adopts pure aluminum/pure copper as a manufacturing material, and has excellent performance. The heat-dissipating effect; the production mold and the production method of the invention are specially designed for the material of the pure aluminum/pure copper radiator itself, and the stamping process can make the base and the heat-dissipating tube integrally formed, and the production is efficient, fast and feasible.

In addition, the present invention preferably has a cold stamping process, which ensures that the product can be completed, the process does not require any external heating, does not generate waste gas, saves energy, and is environmentally friendly and economical.

In addition, the pure aluminum/pure copper radiator of the invention is provided with fins on the outer wall of the heat dissipation pipe, which can further increase the heat dissipation area; the corresponding production mold and production method can ensure that the base, the heat dissipation pipe and the fin are integrally formed at the same time, and the operation Simple and easy to use, saving production costs.

The invention can be applied to the field of manufacturing of heat sinks.

DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is apparent that the described drawings are only a part of the embodiments of the present invention, and not all of the embodiments, and those skilled in the art can obtain other designs and drawings according to the drawings without any creative work.

1 is a schematic perspective view of a pure aluminum/pure copper heat sink according to the present invention, in order to clearly show the overall structure, only fins are drawn on one of the heat pipes;

2 is a schematic structural view of a production mold in the present invention, wherein the lower mold is in a half-sectional state, and the upper mold is clamped with a schematic pure aluminum/pure copper ingot, and the arrow in the figure indicates the punching direction;

Figure 3 is a schematic view of a pure aluminum/pure copper ingot in the production method of the present invention, which is in an unpunched state;

Figure 4 is a schematic view of a pure aluminum/pure copper ingot in the production method of the present invention, which is in a punched state;

Fig. 5 is a perspective view showing another three-dimensional structure of a pure aluminum/pure copper heat sink according to the present invention. In order to clearly show the overall structure, only fins are drawn on one of the heat pipes.

detailed description

The concept, the specific structure and the technical effects of the present invention will be clearly and completely described in conjunction with the embodiments and the accompanying drawings in order to fully understand the objects, features and effects of the present invention. It is apparent that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments, based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without creative efforts belong to The scope of protection of the present invention. In addition, all the coupling/joining relationships mentioned in the text are not directly connected to the components, but rather may constitute a better coupling structure by adding or reducing the coupling accessories according to the specific implementation.

(1) Referring to FIG. 1, a pure aluminum/pure copper heat sink includes a base 11. One side of the base 11 is provided with at least one heat pipe 12 having a plurality of fins 13 on the outer wall. One end of the tube 12 is connected to the base 11 , the tube body is perpendicular to the base 11 , the inner hole of the tube penetrates the base 11 , and the fin 13 extends in the direction of the tube body; the base 11 , the heat dissipation tube 12 and the fin 13 are the same whole. The whole is a pure aluminum/pure copper component.

Further, as a preferred embodiment, the heat pipe 12 has a rectangular cross section, and the plurality of heat pipes 12 are disposed on the base 11 in parallel with each other. The heat-dissipating tube 12 of rectangular cross-section facilitates the grasping and clamping during assembly without losing its guiding function. The pure aluminum/pure copper heat sink has better heat conduction and heat dissipation effect than the ordinary aluminum alloy material. Since the base 11, the heat pipe 12 and the fins 13 are the same as a whole, there is no blockage in the middle of heat transfer, and the heat transfer efficiency is higher than that of the split-mounted heat sink.

(2) Referring to Figures 1 to 4, a method of producing the pure aluminum/pure copper heat sink comprises the following steps:

1) making a pure aluminum/pure copper ingot 31 comprising a base prototype 32 having at least one boss 33 on one side of the base prototype 32; in actual production, the boss 33 The number should correspond one-to-one with the number of heat pipes 12;

2) punching the pure aluminum/pure copper ingot 31, the hole starting from the top end of the boss 33, vertically penetrating the boss 33 and the base shape 32, so that the boss 33 is shaped into a prototype heat pipe;

 3) The actual size of the heat pipe 12 of the pure aluminum/pure copper heat sink is drawn by drawing the prototype heat pipe.

In the step 3), a plurality of fins 13 extending in the direction of the tube body are formed on the outer wall of the heat dissipation tube 12 while punching and stretching the heat dissipation tube. This can be achieved by using the production mold described below.

Further as a preferred embodiment, the press stretching in the step 3) is a cold stamping drawing. The stamping and stretching action of step 3) can be completely completed by a cold stamping process without a heat source, and the material is not heated, so that the processing method has the effect of energy saving and environmental protection. However, if the pure aluminum/pure copper ingot 31 is heated to a certain extent in advance to improve its plasticity, this embodiment can also be used as one of the specific embodiments of the method as long as it does not bond the mold.

(3) Referring to FIG. 2, a production mold for manufacturing the pure aluminum/pure copper heat sink includes an upper mold 21 and a lower mold 22; and an upper surface of the lower mold 22 is provided with at least one vertical formed hole 23, the forming hole 23 is reduced in the axial direction, and is divided into an upper section, a transition section and a lower section, the upper section has a larger diameter than the lower section, and the transition section has a funnel shape which is gradually narrowed, and connects the upper section and the lower section, and the lower section is connected. The inner wall is provided with a plurality of sharp ribs 24 distributed around the central axis of the forming hole 23; the lower surface of the upper mold 21 is provided with a fixing jig aligned with the forming hole 23; the number of the forming holes 23 and the pure aluminum/purity to be produced The number of heat pipes 12 on the copper heat sink match.

Further as a preferred embodiment, the transition section has a cone apex angle of 27°. After many tests, the cone angle of 27° is a preferred lead-in angle, which facilitates the pressing of pure aluminum/pure copper billets during the stamping process.

Further as a preferred embodiment, the upper section of the hole is rounded. Here, the hole is rounded, so that the root of the heat pipe 12 during stamping is not easily broken, and the pure aluminum/pure copper ingot is also pressed and drawn.

Further, as a preferred embodiment, the upper mold 21 is divided into upper and lower layers, the fixing jig is disposed on the lower layer, and a buffer device is disposed between the upper layer and the lower layer. Specifically, the buffer device may be a strong spring and a cushion rubber provided between the upper and lower layers, and the buffer device may exist to prevent the impact force from being excessively caused to cause the lower mold 22 to collapse.

Further, as a preferred embodiment, the lower mold 22 is divided into an inner portion and an outer portion, and the outer portion is divided into a fixed base, and a central hole is opened in the fixed base for the inner portion to be inserted; the inner portion includes a plurality of vertical flaps A sub-mold that encloses the shaped hole 23. At the time of production, the heat pipe of the pure aluminum/pure copper radiator needs to strike the molding hole 23 with a large impulse, and in the case of uneven force, the lower mold material near the molding hole 23 is easily broken, and the inner portion is designed into a sub-assembly. The form of the mold is beneficial to disperse the impact stress and protect the mold.

It should be noted that, in FIG. 2, only the inner portion of the lower mold 22 is partially divided, and only one molding hole 23 is shown in the figure, and if a plurality of heat dissipation tubes 12 are arranged side by side on the base 11, the corresponding ones are correspondingly A plurality of molding holes 23 may be added to the portion.

In addition, referring to Fig. 5, if a horizontal row arrangement of the center holes is employed, a heat sink having heat pipes arranged in a horizontal row can be produced. In practice, the skilled person can refer to this example, freely transform the arrangement of the heat pipe, and the pure aluminum/pure copper heat sink produced is an equivalent transformation of the utility model.

The following details how to use the production mold to complete its production steps:

1), the production of pure aluminum / pure copper ingot 31, note that the cross-sectional shape of the boss 33 is slightly larger than the section of the lower section of the forming hole 23; here can be used cutting and forging method to produce pure aluminum / pure copper ingot 31;

2) punching the pure aluminum/pure copper ingot 31 to form the boss 33 into a tubular shape;

3), the completed pure aluminum / pure copper ingot 31 is clamped to the fixing fixture of the upper mold 21, the base prototype 32 is clamped, the boss 33 is facing downward, aligned with the forming hole 23 of the lower mold 22;

4), the upper mold 21 is quickly undershot, the boss 33 is driven into the forming hole 23, the upper and lower molds are closed, and then the upper mold 21 is lifted up until the boss 33 is pulled out of the forming hole 23, at which time the boss 33 is pulled. Long and forming fins 13 on the outer wall;

5), complete step 4) a number of times until the boss 33 is no longer elongated, or has been elongated to the actual size of the heat pipe 12 of the pure aluminum/pure copper heat sink.

The principle of this method is:

The upper mold 21 is quickly undercut, and the prototype of the heat pipe, that is, the boss 33, is quickly flushed into the upper portion of the molding hole 23, and then pressed by the transition portion to be quickly inserted into the lower portion. Due to the rapid stamping action, the soft metal such as pure aluminum/pure copper has a lower melting point, so that the outer surface of the boss 33 is slightly melted under rapid friction, so that it can still enter the inner diameter when the outer diameter is large. The lower molding hole 23 is in the lower section. Then, the upper mold 21 is lifted up, at this time, the sharp ribs 24 will scrape the outer surface of the boss 33. Since the pure aluminum/pure copper has excellent ductility, the adhesion will lengthen the surface metal, so that after the mold is opened, The overall length of the boss 33 is elongated and a fin 13 matching the sharp rib 24 is formed on the outer surface. Repeated operation multiple times, can produce the actual size of pure aluminum / pure copper radiator.

The above is a detailed description of the preferred embodiments of the present invention, but the invention is not limited to the embodiments, and various modifications and substitutions can be made by those skilled in the art without departing from the spirit of the invention. Such equivalent modifications or alternatives are intended to be included within the scope of the claims.

Claims (12)

A pure aluminum/pure copper heat sink, comprising: a base (11), at least one heat pipe (12) is disposed on one side of the base (11), and one end of the heat pipe (12) is connected to the base (11) The tube body is perpendicular to the base (11), and the inner hole of the tube penetrates the base (11); the base (11) and the heat dissipation tube (12) are the same whole, and the whole is a pure aluminum/pure copper member. The pure aluminum/pure copper heat sink according to claim 1, wherein a plurality of fins (13) are disposed on an outer wall of the heat pipe (12), and the fins (13) extend in a direction of the pipe body; The base (11), the heat pipe (12) and the fins (13) are the same whole, and the whole is a pure aluminum/pure copper member. The pure aluminum/pure copper heat sink according to claim 1 or 2, wherein the heat pipe (12) has a rectangular cross section, and the plurality of heat pipes (12) are disposed in parallel with each other at the base ( 11) On. A method of producing a pure aluminum/pure copper heat sink according to claim 1, comprising the steps of:  1) making a pure aluminum/pure copper ingot, the pure aluminum/pure copper ingot comprising a base prototype having at least one boss on one side of the base shape; 2) punching the pure aluminum/pure copper billet, the hole starts from the top end of the boss, and vertically penetrates the boss and the base shape, so that the boss is formed into a prototype heat pipe;  3) The actual size of the heat pipe (12) of the pure aluminum/pure copper heat sink is drawn by drawing the prototype heat pipe. The method for producing a pure aluminum/pure copper heat sink according to claim 4, wherein in the step 3), the original heat-dissipating tube is drawn and stretched, and the outer wall of the heat-dissipating tube (12) is formed. A plurality of fins (13) extending in the direction of the tube body are formed. A method of producing a pure aluminum/pure copper heat sink according to claim 4 or 5, characterized in that the press stretching in the step 3) is a cold stamping drawing. A production mold for realizing a pure aluminum/pure copper heat sink according to claim 4, comprising: an upper mold (21) and a lower mold (22); at least one upper surface of the lower mold (22) is provided a vertical forming hole (23), the forming hole (23) is reduced in the axial direction, and is divided into an upper section, a transition section and a lower section, the upper section aperture is larger than the lower section, and the transition section is gradually narrowed in a funnel shape, and the upper section is The lower section is connected; the lower surface of the upper mold (21) is provided with a fixing jig aligned with the forming hole (23). A production mold for a pure aluminum/pure copper heat sink according to claim 7, characterized in that the inner wall of the lower section is provided with a plurality of sharp ribs (24) distributed around the central axis of the forming hole (23). A production mold for a pure aluminum/pure copper heat sink according to claim 7, wherein the transition section has a cone angle of 27°. A production mold for a pure aluminum/pure copper heat sink according to claim 7, wherein the upper portion of the hole is rounded. The production mold of a pure aluminum/pure copper heat sink according to claim 7, wherein the upper mold (21) is divided into upper and lower layers, the fixing jig is disposed in the lower layer, and a buffer device is disposed between the upper layer and the lower layer. . A production mold for a pure aluminum/pure copper heat sink according to claim 7, wherein the lower mold (22) is divided into an inner portion and an outer portion, and the outer portion is divided into a fixed table, and a central hole is opened in the fixed table. The inner portion is inserted; the inner portion includes a plurality of vertical molds, and the sub-modules enclose the shaped holes (23).

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