JP6925574B2 - How to form vertical fins - Google Patents

Description

The present invention relates to, for example, a method for forming vertical fins in which plate-shaped heat radiating fins of a radiator for efficiently radiating heat generated from an electronic component or the like are dug up and vertically formed by a tool.

For example, in order to dissipate heat generated from an electronic component such as a semiconductor integrated circuit, a radiator generally used in practice 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 heat radiation fins of the radiator. This radiator is usually manufactured by extruding or casting a metal material having good thermal conductivity, which is made of aluminum.

Further, a method for manufacturing a radiator for forming radiation fins by using a digging tool is disclosed in Japanese Patent Application Laid-Open No. 2001-156224 (Patent Document 1) and Japanese Patent Application Laid-Open No. 2005-142247 (Patent Document 2). In the method for manufacturing a radiator shown in Patent Document 1, a heat sink material made of an aluminum alloy extruded profile having a projecting work portion for forming fins formed on the upper surface side of a substrate portion is used, and the fins are formed. The work piece is dug up using a cutting tool such as a cutting tool, whereby a plurality of fins are formed.

The method for manufacturing a radiator shown in Patent Document 2 is a state in which a hoop-shaped metal material having good thermal conductivity and a digging tool having a blade formed on the tip side in the moving direction have a predetermined angle. By digging down the hoop-shaped metal material by moving relative to each other, plate-shaped heat-dissipating fins are integrally formed upright, and then the heat-dissipating fins are vertically formed from the upstream side of the formation pitch by the forming pitch. By moving the hoop-shaped metal material and the digging tool relative to each other and digging up the hoop-shaped metal material, the next plate-shaped heat radiation fin is integrally formed upright, and thereafter, by repeating this digging process in sequence, the hoop-shaped metal material is formed. A plurality of heat radiating fins are continuously formed on the surface.

Japanese Unexamined Patent Publication No. 2001-156224 Japanese Unexamined Patent Publication No. 2005-142247

As shown in Patent Documents 1 and 2 described above, when the heat radiation fins are formed by using a digging tool, the heat radiation fins 101 curl and stand up from the metal material 100 as shown in FIG. 7. The plate thickness on the base end side of the is thicker, and the plate is gradually formed thinner toward the tip end. Therefore, the distance G1 on the base end side of the adjacent heat radiation fins 101 is narrow, and the distance G2 on the tip end side is wide. When the heat radiating fin 101 of this form is used as a heat radiator, for example, when the heat 103 generated from the heat source 102 of an electronic component or the like is radiated, the heat 103 is generated between the heat radiating fins 101 via the metal material 100 as shown by the dotted line. And heat is radiated through the heat radiating fins 101. Since heat has the property of rising in the vertical direction, when heat is radiated from between the heat radiating fins 101, if the heat radiating fins 101 are curling, the heat 103 indicated by the dotted line meanders while hitting the side surface of the heat radiating fins 101. To rise. Therefore, the heat radiating fin 101 may be reheated, which is a factor of lowering the heat radiating efficiency.

In order to quickly raise the heat 103 radiated through the metal material 100, it is desirable to vertically erect and form the heat radiating fins. A radiator having such vertical heat radiation fins 101 formed is generally manufactured by extruding or casting a metal material. However, in the extrusion process or the casting process, since the thickness and spacing of the heat radiating fins cannot be reduced, the heat radiating area is reduced, so that the heat radiating efficiency cannot be improved, and there is a problem that the size is inevitably increased. On the other hand, in the method of forming heat-dissipating fins using a digging tool, it is possible to increase the heat-dissipating area and improve the heat-dissipating efficiency by reducing the thickness and spacing of the heat-dissipating fins, but the heat-dissipating fins are vertically erected. There was no way to form it.

Therefore, an object of the present invention is to provide a method for forming vertical fins capable of forming heat radiation fins of a radiator standing upright using a digging tool substantially perpendicular to a flat surface of a metal material. ..

In order to solve the above problems, the method for forming a vertical fin according to the present invention includes a digging tool having a blade portion formed on the tip side moved by a moving device, and the moving device uses the digging tool as the metal. A digging process in which an inclined plate-shaped fin is formed upright by moving the material at a predetermined angle with respect to a flat surface and digging up, and the digging tool is raised in the vertical direction to incline the blade portion. The movement of the digging tool includes a straightening step of standing up and straightening the metal material so as to be in contact with the fin and retreating the digging tool to a position where the next fin is digged. The gist is to vertically straighten the fins formed upright from the metal material.

According to the method for forming a vertical fin according to the present invention, an inclined plate-shaped fin is vertically formed by tilting and moving a digging tool having a blade portion formed on the tip side with respect to a flat surface of a metal material. After the digging step, the digging tool used in this digging step is moved in the direction perpendicular to the plane of the metal material, so that the inclined plate-shaped fins can be vertically straightened. Therefore, there is no need for a mechanism or device for vertically straightening the inclined plate-shaped fins, and the vertical fins can be formed easily and inexpensively.

It is a side view which shows an example of the method of forming a vertical fin which concerns on this invention. It is a perspective view which shows the radiator formed by the vertical fin. It is explanatory drawing which shows the movement locus of a digging tool. (A) to (H) are process explanatory views which show the process of forming a vertical fin. (A) to (D) are process explanatory views which show other Examples of a correction process. It is explanatory drawing which shows the heat dissipation state of the heat dissipation fin by this invention. It is explanatory drawing which shows the heat dissipation state of the conventional curling heat dissipation fin.

The method for forming a vertical fin according to the present invention includes a digging tool having a blade formed on the tip side moved by a moving device, and the moving device makes the digging tool at a predetermined angle with respect to a flat surface of a metal material. The metal in the digging step of erecting and forming an inclined plate-shaped fin by moving and digging while holding the metal, and the metal while raising the digging tool in the vertical direction and bringing the blade portion into contact with the inclined fin. The straightening step of upright straightening perpendicular to the plane of the material and the retreating step of retracting the digging tool to the position where the next fin is dug up are included, and the digging tool is moved to erect and form the metal material. Straighten the fins vertically.

Hereinafter, a method for forming a vertical fin according to the present invention will be described in detail with reference to the drawings. FIG. 1 shows an example of a method for forming a vertical fin according to the present invention. The digging tool 1 is attached to a drive device (not shown) and moves forward and backward with a predetermined angle θ with respect to the plane of the metal material 2 described later. A blade portion 1a is formed on the tip side of the digging tool 1 in the moving direction. As shown in FIG. 2, the width of the blade portion 1a is set smaller than the width of the metal material 2. The width of the blade portion 1a is set according to the width of a plurality of vertical fins formed on the radiator 10 described later.

Further, the digging tool 1 is a flat surface parallel to the angle θ at which the bottom surface moves, and the blade portion 1a is formed with a sliding contact surface 1b inclined with respect to the bottom surface so as to have an acute angle at which the metal material 2 can be cut. Has been done. The sliding contact surface 1b has a low coefficient of friction so as not to become a resistance when the vertical fin 3 described later is dug up and formed. By reducing the friction of the sliding contact surface 1b in this way, when the vertical fins 3 are dug up and formed, the metal material 2 slides along the sliding contact surface 1b without receiving the resistance of the sliding contact surface 1b. , The flat plate-shaped vertical fin 3 can be formed upright. Further, the inclination angle θ of the digging tool 1 is appropriately set depending on the height and plate thickness of the vertical fin 3 described later, the material of the metal material 2, and the like, but is generally set to 5 to 20 degrees. .. Although both sides of the digging tool 1 in the width direction are formed at substantially right angles, both sides of the bottom surface side on which the blade portion 1a is formed are formed in a tapered shape or an arc shape that becomes narrower toward the bottom surface. You may.

The digging tool 1 moves under the control of a movement locus as shown in FIG. 3 by a driving device. Reference numeral (2) is a digging step, in which the digging tool 1 moves forward while maintaining the inclination angle θ, and the metal material 2 is formed with fins upright. Next, b is a straightening step, in which the fin is dug up from the position where the fin is formed upright, the tool 1 is raised in the vertical direction, and the blade portion 1a is brought into contact with the inclined fin, and is perpendicular to the plane of the metal material 2. Orthodontic correction. c is a retracting step, in which the digging tool 1 is retracted to a position where a digging allowance D for digging the next fin is obtained, and a series of circulation operations in which the blade portion 1a is brought into contact with the metal material 2 by the descending step of d. Is repeated.

Next, with reference to FIG. 4, a method of standing upright formation of the vertical fins 3 formed on the radiator 10 as shown in FIG. 2 will be described. The metal material 2 used as the radiator 10 is formed of a metal material that can be plastically processed and has good thermal conductivity, for example, aluminum, an aluminum alloy, a copper alloy, or stainless steel. A material having a predetermined plate thickness is used. The metal material 2 may be a block material having a thickness of several cm or more, or a component provided with a heat source that requires heat dissipation, for example, in addition to a metal plate having a plate thickness of about several mm.

First, as shown in FIG. 4A, the blade portion 1a of the digging tool 1 is brought into contact with a predetermined position on one surface separated from one end side of the metal material 2, and then the digging step of a shown in FIG. 3 is performed. When the digging tool 1 is brought into contact with the flat surface of the metal material 2 by a driving device (not shown) in the direction indicated by the arrow at a predetermined angle θ, and then the blade portion 1a of the digging tool 1 is moved, the metal material 2 As shown in FIG. 4A, small fins 3a having a low height and a thin wall are formed upright. At this time, it is desirable that the pressure for inserting the digging tool 1 into the metal material 2 is set to such an extent that the metal material 2 is not deformed or stressed. Therefore, since the depth for inserting the digging tool 1 is shallow, the small fins 3a are formed to stand up low.

After the blade portion 1a of the digging tool 1 erects and forms the small fins 3a, as shown in FIG. 4B, the blade portion 1a of the digging tool 1 is formed from that position as in the straightening step of b shown in FIG. Ascend vertically. At this time, the blade portion 1a is vertically straightened with respect to the flat surface of the metal material 7 while being brought into contact with the inclined small fin 3a.

Next, as shown in FIG. 4C, the digging tool 1 is moved as in the retreating step of c shown in FIG. 3, and the blade portion 1a is moved to a position where the digging allowance D on the upstream side (left side in the drawing) can be obtained. In addition to abutting by the lowering step of d shown in FIG. 3, the digging step is performed by digging deeper than when the previous small fin 3a was formed upright, and the next small fin 3a higher than the previous small fin 3a is erected. Form. The next small fin 3a formed upright in this way is also vertically uprightly straightened by raising the blade portion 1a in the vertical direction as in the straightening step b shown in FIG.

After that, the digging step shown in FIG. 4D, the straightening step shown in FIG. 4E, the retreating step shown in FIG. 4F, and the descending step are sequentially repeated, and the digging tool 1 is sequentially dug deeply. The small fins 3a are formed to stand up higher than the small fins 3a formed in the above, and the process of forming the small fins is completed when the blade portion 1a reaches a predetermined depth.

Following the step of forming the small fins 3a as described above, the process proceeds to the step of forming the vertical fins 3 to form a plurality of vertical fins 3 having the same height as shown in FIG. That is, after the blade portion 1a of the digging tool 1 is brought into contact with the metal material 2 from a position where the digging allowance on the upstream side can be obtained from the last formed small fin 3a, the blade portion 1a of the digging tool 1 is brought into contact with the metal material 2 and then brought to a predetermined depth while maintaining the inclination angle. By moving until it reaches, the digging step shown in FIG. 4 (G) is performed. After that, the vertical fin 3 is formed by performing the straightening step shown in FIG. 4 (H). Subsequently, similarly to the above-described small fin 3a forming step, the blade portion 1a of the digging tool 1 sequentially repeats the digging step, the straightening step, the retracting step, and the lowering step, so that the plurality of vertical fins 3 stand up. It is formed.

As described above, when the straightening process is performed by the blade portion 1a of the digging tool 1, the vertical fins 3 are inclined at the start of the straightening process, so that the blade portion 1a side of the inclined sliding contact surface 1b And the side surface of the vertical fin 3 come into contact with each other. After that, when the digging tool 1 is moved in the vertical direction, the vertical fin 3 is pressed in the vertical direction while the sliding contact surface 1b and the side surface of the vertical fin 3 are in sliding contact with each other. Sliding contact. However, in the straightening step, when the load is most applied to the blade portion 1a of the digging tool 1, it is at the start of the straightening step, and then the load on the blade portion 1a becomes smaller as the vertical fins 3 stand up. Therefore, in the straightening step, when a load is applied to the blade portion 1a, the sliding contact surface 1b receives the load, and then the blade portion 1a is reduced as the load becomes smaller, so that the life of the digging tool 1 is extended. Adverse effects are reduced.

As described above, by performing the step of forming the vertical fins 3, the radiator 10 in which the plurality of vertical fins 3 perpendicular to the metal material 2 are formed as shown in FIG. 2 is manufactured. By forming the vertical vertical fins 3 in this way, as shown in FIG. 6, for example, the heat 103 generated from the heat source 102 of an electronic component or the like is transferred to the vertical fins 3 via the metal material 2 as shown by the dotted line. The heat is dissipated between the spaces and through the vertical fins 3, but since the heat 103 has a property of rising in the vertical direction, the heat 103 smoothly rises from between the vertical fins 3 and is dissipated. Therefore, the heat dissipation efficiency can be improved.

In the above-described forming method of the present invention, the vertical fins 3 are vertically straightened with respect to the plane of the metal material 2, but in order to further improve the heat dissipation performance depending on the application of the radiator 10, the vertical fins 3 are formed. In some cases, 3 is slightly tilted at an angle of 10 degrees or less. In this case, in the straightening step, the slightly inclined vertical fin 3 can be formed by moving the blade portion 1a of the digging tool 1 so as to have a predetermined angle with respect to the flat surface of the metal material 2. That is, in the present invention, "vertical" also includes vertical fins 3 that are slightly inclined.

In the method for forming the vertical fin 3 described above, when the plate thickness of the vertical fin 3 is as thin as 0.1 mm to 0.8 mm, the blade portion 1a of the digging tool 1 is vertically moved from the digging step to the straightening step. It can be performed. However, when the digging process is performed by the digging tool 1, the tip of the blade portion 1a is in a state of biting into the base of the vertical fin 3 as shown in FIG. 5A. Therefore, when the plate thickness of the vertical fin 3 exceeds 0.8 mm, if the cutting process is started from the state where the blade portion 1a is bitten, a large load is applied to the blade portion 1a, and in some cases, the blade portion 1a is damaged. there's a possibility that. As described above, when the vertical fin 3 is relatively thick, as shown in FIG. 5 (B), the digging tool 1 is retracted by a slight dimension from the position where the digging process or the end is completed, and the vertical fin 3 is inclined. Provide a gap between the side surface and the side surface. After that, as shown in FIG. 5 (C), the blade portion 1a of the digging tool 1 is moved in the vertical direction to move the vertical fins 3 vertically, and as shown in FIG. By performing the above, the load on the blade portion 1a at the start of the straightening step can be reduced and damage can be prevented.

Although the present invention has been specifically described above based on the examples, it goes without saying 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 material, 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. The heat radiating fins may be formed on a part of a metal holding member, a housing that requires a heat radiating function, or the like in order to dissipate heat generated by the substrate, the 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 material, but they may be formed at a predetermined angle. Further, when forming a plurality of fin groups, the formation angles may be appropriately different, such as making the first fin group and the second fin group orthogonal to each other.

1 Digging tool 1a Blade 1b Sliding contact surface 2 Metal material 3 Vertical fin 10 Radiator

Claims (1)

Equipped with a digging tool with a blade formed on the tip side that is moved by the moving device,
The moving device includes a digging step of moving the digging tool at a predetermined angle with respect to a flat surface of a metal material to dig up to form an inclined plate-shaped fin, and a vertical direction of the digging tool. A straightening step in which the blade portion is brought into contact with the inclined fin and is vertically straightened with respect to the flat surface of the metal material, and a retreating step in which the digging tool is retracted to a position where the next fin is dug up. Including and
A method for forming a vertical fin, which vertically straightens the fins formed upright from the metal material by moving the digging tool.

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