JP7093495B2 - How to make a radiator - Google Patents

Description

The present invention relates to, for example, a method for manufacturing a radiator having plate-shaped heat dissipation fins for efficiently dissipating heat generated from an electronic component or the like.

For example, in order to dissipate heat generated from an electronic component such as a semiconductor integrated circuit, a radiator that has been generally put into practical use conventionally has a large number of comb-shaped heat radiating fins vertically erected on a base. By directly or indirectly joining the radiator to an electronic component or the like, heat is dissipated to the outside through the radiator fins of the radiator. This radiator is usually manufactured by extruding or casting a metal plate made of aluminum having good thermal conductivity.

Further, a method for manufacturing a radiator for forming a heat radiating fin by using a digging tool is disclosed in Japanese Patent No. 4888721 (Patent Document 1). FIG. 6 shows an outline of the method for manufacturing a radiator shown in Patent Document 1. In this radiator 100, the metal plate 102 having good thermal conductivity and the digging tool 106 are inserted at a predetermined position separated from one end side 102a of the metal plate 102 with the digging tool 106 having a predetermined angle. The small fins 103a are formed, and a plurality of small fins 103a are sequentially formed until the blade portion 106a of the digging tool 106 reaches a predetermined depth. After that, following the small fins 103a, a fin forming step of integrally standing up and forming the plate-shaped heat radiating fins 103 with the digging tool 106 is sequentially repeated to continuously form the plurality of heat radiating fins 103 on the metal plate 102.

Japanese Patent No. 4888721

The method for manufacturing the radiator 100 shown in Patent Document 1 described above makes it possible to form the radiator fin 103 from a predetermined position separated from the one end side 102a of the metal plate 102. However, for example, as shown in FIG. 6, when a cover is put around the heat radiating fin 103 and the radiator is used as a radiator in which a liquid or gas refrigerant is circulated between the heat radiating fins 103, the size is small. A large space 105 is formed between the fin 103a and the cover 104. Since the flow resistance of this space 105 is smaller than that between the heat radiation fins 103, the refrigerant is concentrated and circulates in the space, so that there is a problem that the heat radiation efficiency cannot be improved. Further, since the small fins 103a are in a nodule state due to the narrow space between the fins, the distribution resistance becomes large and does not contribute to heat dissipation, so that the heat dissipation efficiency cannot be improved.

Therefore, an object of the present invention is to provide a method for manufacturing a radiator capable of forming a formed portion of a small fin on the same surface as a metal plate even if the heat radiating fin is formed from a position separated from one end side of the metal plate. There is something in it.

In order to solve the above problems, the method for manufacturing a radiator according to the present invention includes a metal plate such as aluminum or copper, and a digging tool having a blade formed on the tip side in the moving direction, and the metal plate and the radiator. By advancing the digging tool at a predetermined angle and digging down the metal plate with the blade portion of the digging tool, plate-shaped heat radiation fins having a predetermined height are integrally formed upright and formed upright. By digging up the metal plate with the digging tool retracted by a predetermined pitch from the radiating fins, the next plate-shaped radiating fins are integrally formed upright, and then the digging with the digging tool is repeated in sequence to form the metal plate. It has a heat radiation fin forming step of continuously forming a plurality of the heat radiation fins, and the heat radiation fins are formed at a predetermined height by the digging tool from a predetermined position separated from one end side of the metal plate. A pretreatment step of sequentially digging to a predetermined depth is provided, and the pretreatment step is performed after the digging tool is inserted in a state of having a predetermined angle to erect and form a small first small fin and retract it. The digging tool is moved forward horizontally to cut the tip of the first small fin to form a flat surface, and then the digging tool is retracted by a predetermined pitch and the digging tool is moved to the first small fin. The second small fin is formed upright and retracted by inserting it deeper than at the time of upright formation and digging up the metal plate, and then the digging tool is horizontally advanced to the tip of the second small fin and the above. The tip of the first small fin is cut to form a flat surface, and thereafter the digging tool is retracted by a predetermined pitch, and the digging tool is previously upright formed to form the first small fin and the second small fin. After the small fins are formed upright and retracted by inserting the metal plate deeper than when the metal plate is formed, the digging tool is horizontally advanced to form the first small fins in advance. And the step of cutting the tip together with the second small fin to form a flat surface is repeated n times in sequence until the heat radiation fin reaches a predetermined height, and all the steps formed from the first small fin to the nth time. The gist is that the tip of the small fin is formed on the same surface as the metal plate.

Further, in the pretreatment process, when the digging tool is inserted to form a small fin upright, the next small fin is set to the pitch for retracting the digging tool after cutting the tip of the small fin. It is desirable to join.

According to the method for manufacturing a radiator according to the present invention, when forming a radiator fin from a position separated from one end side of a metal plate, in the pretreatment step, a digging tool is inserted to form a small first small fin. After the upright formation, the digging tool is advanced horizontally to cut the tip of the small fin, and then the digging tool is inserted deeper than when the first small fin was upright formed, and the second small fin is smaller. After the upright formation, the digging tool is advanced horizontally to cut the tips of the first and second small fins, and then the heat dissipation fins of a predetermined height are sequentially repeated until the upright formation is formed. The tip surface of the small fin can be formed on the same surface as the metal plate. At this time, since the tip side of the small fin is cut thinly by moving the digging tool, the load of the digging tool is small and the risk of shortening the life of the digging tool can be eliminated. Even when the cover is covered around the heat dissipation fins, the tips of the plurality of small fins are flat surfaces on the same surface of the metal plate, so that the cover can be dissipated without being disturbed by the small fins. Since it can be close to the side surface of the fin, it is possible to prevent the adverse effect of the small fin in advance.

Further, in the pretreatment process, when the digging tool is inserted to form a small fin upright, the next small fin is set to the pitch for retracting the digging tool after cutting the tip of the small fin. By joining, the side surfaces of the small fins are face-joined and sealed, so that the state can be almost the same as that of the metal plate. Therefore, it is possible to almost ignore the formation of the small fins.

It is sectional drawing which shows the outline of the manufacturing method of the radiator according to this invention. It is a perspective view which shows the radiator formed by the manufacturing method of a radiator. (A) to (K) are process explanatory views which show the manufacturing process of a radiator. It is explanatory drawing which shows the state which covered the cover on the radiator by this invention. It is explanatory drawing which shows the conventional radiator. It is explanatory drawing which shows the state which covered the cover on the conventional radiator.

The method for manufacturing a radiator according to the present invention includes a metal plate such as aluminum or copper and a digging tool having a blade formed on the tip side in the moving direction, and the metal plate and the digging tool have a predetermined angle. By advancing the metal plate with the blade of the digging tool and digging down the metal plate, a plate-shaped heat radiation fin having a predetermined height is integrally formed upright, and the heat radiation fin is formed upright by a predetermined pitch. By digging up the metal plate with the retracted digging tool, the next plate-shaped radiating fins are integrally formed upright, and then digging up with the digging tool is repeated in sequence to continuously connect a plurality of the radiating fins to the metal plate. A pretreatment for forming heat-dissipating fins by sequentially digging from a predetermined position separated from one end side of the metal plate to a predetermined depth at which the heat-dissipating fins are formed at a predetermined height by the digging tool. The pretreatment step comprises a step of inserting the digging tool in a state of having a predetermined angle to erect and retract a small first small fin, and then advancing the digging tool horizontally. The tip of the small fin is cut, and then the digging tool is retracted by a predetermined pitch, and the digging tool is inserted deeper than when the first small fin is formed upright to dig up the metal plate. After the second small fin is formed upright and retracted, the digging tool is horizontally advanced to cut the tip of the second small fin and the first small fin, and thereafter, the digging tool is used. The digging tool is retracted by a predetermined pitch, and the digging tool is inserted deeper than when the small fin was formed upright in advance to dig up the metal plate to form the small fin upright and retracted. The process of advancing horizontally and cutting the tip together with the preformed small fin is sequentially repeated until the heat radiation fin reaches a predetermined height, and the tips of the plurality of small fins are flush with the metal plate. It is formed.

Hereinafter, the method for manufacturing the radiator according to the present invention will be described in detail with reference to the drawings. 1 and 2 show a radiator 1 formed by the method for manufacturing a radiator according to the present invention. The radiator 1 is formed upright with a plurality of heat radiation fins 3 formed vertically in a plate shape separated from a metal plate 2 made of, for example, aluminum or copper, which has good thermal conductivity. A flat surface 2a is formed on one end side of the plurality of heat radiation fins 3 on the right side of the drawing so as to be flush with the surface of the metal plate 2 by the plurality of small fins. Further, on the other end side on the left side of the drawing of the plurality of heat radiation fins 3, an inclined machined surface 2b formed when the heat radiation fins 3 are upright formed by the digging tool 4 is formed. The metal plate 2 is a metal plate having a thickness of about several cm, or a metal plate used for a part provided with a heat source that requires heat dissipation, for example, in addition to a metal plate having a thickness of about several mm. May be there.

Next, the flat surface 2a formed by the plurality of small fins and the heat radiation fin 3 are formed by the digging tool 4. The digging tool 4 is attached to a drive device (not shown) and moves back and forth with a predetermined angle θ with respect to the plane of the metal plate 2 described later. A blade portion 4a is formed on the tip end side of the digging tool 4 in the moving direction. As shown in FIG. 2, the width of the blade portion 4a is set to be smaller than the width of the metal plate 2. The width of the blade portion 4a is set according to the width of the plurality of heat radiating fins 3 formed in the radiator 1, and the width of the heat radiating fin 3 and the width of the blade portion 4a of the digging tool 4 may be the same. ..

Further, the digging tool 4 is a flat surface parallel to the angle θ at which the bottom surface moves, and the blade portion 4a is formed with a sliding contact surface 4b inclined with respect to the bottom surface so as to have an acute angle at which the metal plate 2 can be cut. Has been done. The sliding contact surface 4b has a low coefficient of friction so as not to become a resistance when the heat radiation fin 3 is dug up and formed. By reducing the friction of the sliding contact surface 4b in this way, when the heat radiation fins 3 are dug up and formed, the metal plate 2 slides along the sliding contact surface 4b without receiving the resistance of the sliding contact surface 4b. It is possible to form the flat plate-shaped heat radiation fins 3 upright. Further, the inclination angle θ of the digging tool 4 is appropriately set depending on the height of the heat radiation fin 3 described later, the plate thickness, the material of the metal plate 2, and the like, but is generally set to 5 to 20 degrees. .. Although both sides of the digging tool 4 in the width direction are formed at substantially right angles, both sides of the bottom surface side on which the blade portion 4a is formed are formed in a tapered shape or an arc shape that becomes narrower toward the bottom surface. May be.

Next, with reference to FIG. 3, a pretreatment step for forming a flat surface 2a formed by a plurality of small fins will be described. First, as shown in FIG. 3A, the blade portion 4a of the digging tool 4 is brought into contact with a predetermined position on one surface separated from one end side of the metal plate 2, and then the digging tool 4 is brought into contact with the digging step. After contacting the flat surface of the metal plate 2 with a drive device (not shown) at a predetermined angle θ in the direction indicated by the arrow, the blade portion 4a of the excavation tool 4 is moved to be slightly smaller than the surface of the metal plate 2. By biting into the depth, as shown in the circle of FIG. 3A, the first small fin 3a having a low height is formed upright.

After the first small fin 3a is erected and formed by the digging tool 4, the digging tool 4 is retracted to the left in the figure until a position where a digging allowance can be obtained, and the blade portion 4a of the digging tool 4 is moved to move the metal plate 2 The first small fin 3a is made to bite deeper than when the first small fin 3a is upright formed from the surface of the above surface, and the next second small fin 3a is upright formed as shown in FIG. 3 (B). At this time, the pitch at which the digging tool 4 is retracted is adjusted so that the side surfaces of the two small fins 3a are surface-joined to the side surfaces of the first small fin 3a that has been formed upright in advance. After that, the digging tool 4 was retracted to the left in the figure until the digging allowance was obtained, and the blade portion 4a of the digging tool 4 was moved to erect and form the second small fin 3a from the surface of the metal plate 2. The third small fin 3a is formed upright as shown in FIG. 3 (C) by biting deeper than the depth of the time. By continuously forming the three small fins 3a upright in this way, the integrated first small fin 3a is formed upright. The reason why the three small fins 3a are formed upright in this way is that the thin-walled small fins are surface-bonded and integrated to facilitate the next cutting step of the tip. In the embodiment shown in FIG. 3, the three small fins 3a formed upright are referred to as the first small fin 3a. This is because the small fins themselves are thin and easily bent, and it is difficult to cut them with the digging tool 4. Therefore, about three pieces are polymerized to increase the strength and enable cutting.

After that, as shown in FIG. 3D, the digging tool 4 is retracted at a predetermined angle θ when the small fins 3a are upright formed, and the digging tool 4 is horizontally advanced from the three small fins. Only the tip of the first small fin 3a is thinly cut, and the small chips 3b are discharged. At this time, the position of the blade portion 4a of the digging tool 4 is set to be the same as the height at which the tip of the first small fin 3a is cut, and is retracted. In this way, cutting thinly prevents the first small fin 3a from being deformed by the pressure of the digging tool 4 due to the thinness, and reduces the wear of the blade portion 4a of the digging tool 4. Because. By this cutting, the tip surface of the first small fin 3a is formed flat, and in this state, the tip surface is higher than the surface of the metal plate 2.

Next, as shown in FIG. 3 (E), the digging tool 4 is retracted to the left in the drawing to a position where a digging allowance can be obtained, the blade portion 4a of the digging tool 4 is moved, and the first from the surface of the metal plate 2. The small fin 3a is made to bite deeper than when the small fin 3a is formed upright, and the second small fin 3a is formed upright. Also at this time, the pitch at which the digging tool 4 is retracted to obtain the digging allowance is set so as to be face-joined to the side surface of the first small fin 3a. Then, after retreating the position of the blade portion 4a of the digging tool 4 to a height for cutting the tip of the second small fin 3a, the digging tool 4 is horizontally set as shown in FIG. 3 (F). At the same time, only the tips of both the second small fin 3a and the first small fin 3a are thinly cut, and the chips 3b are discharged. As a result, the first small fin 3a is formed lower than the height shown in FIG. 3 (D).

After that, by repeating the formation of the small fin 3a and the cutting on the tip side n times, the blade portion 4a of the digging tool 4 reaches the position DL at a predetermined depth as shown in FIG. 3 (G). Then, as shown in FIG. 3 (G), the digging tool 4 is advanced horizontally and cut thinly so that the tips of all the small fins 3a are flush with the surface of the metal plate 2 and the chips 3b. To discharge. As a result, the pretreatment step of gradually forming the small fins 3a upright and repeating the step of cutting the tip thinly until it becomes flush with the surface of the metal plate 2 is completed. At this time, as described above, the side surfaces of the plurality of small fins 3a are integrated in a surface-bonded state.

Next, the process proceeds to the heat radiation fin forming step shown in FIGS. 3 (H) to 3 (K). The blade portion 4a of the digging tool 4 described above has reached the position DL at a predetermined depth by the pretreatment step. This depth is a depth required to form the heat radiation fins 3 having a predetermined height. First, as shown in FIG. 3H, the blade portion 4a of the digging tool 4 is retracted to a position where a digging allowance D can be obtained, and the digging tool 4 is set to a predetermined position until the tip reaches a position DL at a predetermined depth. When the tool is advanced at an angle θ, the heat radiation fins 3 are formed upright along the sliding contact surface 4b of the excavated tool 4, as shown in FIG. 3 (I). After that, as shown in FIG. 3 (J), the heat radiation fin 3 is vertically straightened by raising the digging tool 4 vertically.

Next, as shown in FIG. 3 (K), the blade portion 4a of the digging tool 4 is retracted to the position of the pitch where the digging allowance D can be obtained, and the digging tool 4 is designated until the tip reaches the position DL of the predetermined depth. By repeating the upright forming step of advancing at the angle θ of the above to form the radiating fins 3, a plurality of radiating fins 3 are sequentially formed, and when a predetermined number of radiating fins 3 are formed, this forming step is performed. finish. Then, as shown in FIGS. 1 and 2, an inclined cut surface 2b is formed behind the heat radiation fin 3 formed at the end on the left side of the drawing. The inclined cut surface 2b is formed each time when the above-mentioned small fins 3a are formed upright and when a plurality of heat radiation fins 3 are sequentially formed.

FIG. 4 is used for a radiator 1 in which a cover 5 is covered around the heat radiating fins 3 and a liquid or gas refrigerant is circulated between the radiating fins 3, as in the conventional example shown in FIG. An example of this is shown. In this example, by covering the flat surface 2a of the plurality of small fins 3a whose tip is flush with the surface of the metal plate 2 with the open end of the cover 5, the cover 5 can be brought close to the heat radiation fin 3. .. At this time, a space 6 is formed between the base end side of the small fin 3a and the base end side of the heat radiation fin 3, but the metal plate 2 has flanges on both sides of the heat radiation fin 3 as shown in FIG. Since 2c is formed, by covering with the open end of the cover 5, the space 6 is almost closed, and only the gap between the inner surface of the cover 5 and the side surface of the heat radiation fin 3 is formed. Therefore, since the refrigerant flows between the heat radiation fins 3, the heat radiation efficiency can be improved. Further, even if the refrigerant flows into the space 6, since the stepped slope 2a has a large heat dissipation area and the contact area of the refrigerant is large, the heat dissipation efficiency is not impaired.

In the above-mentioned manufacturing method of the present invention, the heat radiating fins 3 are erected perpendicularly to the flat surface of the metal plate 2. However, in order to further improve the heat radiating performance depending on the application of the radiating device 1, the heat radiating fins 3 are used. It may be slightly tilted at the desired angle. In this case, the slightly inclined heat radiation fin 3 can be formed by moving the blade portion 4a of the digging tool 4 so as to have a predetermined angle with respect to the flat surface of the metal plate 2.

Although the present invention has been specifically described above based on the examples, it is needless to say that the present invention is not limited to the above examples and can be variously modified without departing from the gist thereof. For example, as a metal plate, in addition to a plate-shaped metal material such as aluminum or copper having good thermal conductivity, processing or post-processing is performed, for example, printed wiring having the above metal material as a core. A heat dissipation fin may be formed on a part of a metal holding member, a housing that requires a heat dissipation function, or the like in order to dissipate heat generated by a substrate, a light emitting element, or the like. Further, in the above-described embodiment, the plurality of heat radiation fins are formed parallel to one end of the metal plate, but they may be formed at a predetermined angle. Further, when forming a plurality of fin groups, the first fin group and the second fin group may be made orthogonal to each other, and the formation angles may be appropriately different from each other.

1 Heat sink 2 Metal plate 2a Flat surface 3 Heat sink fin 3a Small fan 4 Digging tool 4a Blade

Claims (1)

A metal plate such as aluminum or copper and a digging tool having a blade formed on the tip side in the moving direction are provided, and the metal plate and the digging tool are advanced at a predetermined angle to advance the blade of the digging tool. By digging down the metal plate, the plate-shaped heat radiation fins having a predetermined height are integrally formed upright, and the metal plate is formed by the digging tool retracted by a predetermined pitch from the upright heat radiation fins. It has a heat radiation fin forming step in which the next plate-shaped heat radiation fin is integrally formed upright by digging up, and then the digging up by the digging tool is sequentially repeated to continuously form a plurality of the heat radiation fins on the metal plate. ,
It is provided with a pretreatment step of sequentially digging the heat radiation fins from a predetermined position separated from one end side of the metal plate to a predetermined depth at which a predetermined height is formed by the digging tool.
In the pretreatment step, the digging tool is inserted in a state of having a predetermined angle to form a small first small fin upright and retracted, and then the digging tool is horizontally advanced to the first step. The tip of the small fin 1 is cut to form a flat surface, and then the digging tool is retracted by a predetermined pitch, and the digging tool is inserted deeper than when the first small fin is formed upright to form the metal plate. After the second small fin is raised and retracted by digging up, the digging tool is advanced horizontally to cut the tip of the second small fin and the tip of the first small fin to make it flat. The metal is formed in After the small fins are formed upright and retracted by digging up the plate, the digging tool is moved forward horizontally to cut the tip together with the preformed first small fins and the second small fins. The step of forming the heat flat is sequentially repeated n times until the heat radiating fin reaches a predetermined height, and the tips of all the small fins formed from the first small fin to the nth time are flush with the metal plate. A method for manufacturing a radiator, which is characterized by being formed.

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