JP2010245357A - Method of manufacturing tip-split radiation fin - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing a radiator having plate-like fins in which a plurality of radiation fins can be formed at arbitrary positions of a metal material without producing any scrap. <P>SOLUTION: The method of manufacturing radiation fins includes forming a compact fin 3 by inserting a digging-up tool 5 at a predetermined position apart from one end side 2a of the metal plate 2 having excellent thermal conductivity in a state where the metal plate 2 and the digging-up tool 5 are at a predetermined angle, and forming a plurality of compact fins 3 one after another until the blade portion 5a of the digging-up tool 5 reaches a predetermined depth. Then, a plurality of radiation fins 4 are formed on the metal plate 2 successively after the formation of the compact fins 3 by repeating a fin forming step of raising the plate-like radiation fins 4 in one body with the digging-up tool 5. At this time, the plurality of compact fins 3 and the plurality of radiation fins 4 each have a base coupled to the metal plate 2 in one body, so that no scrap is produced. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a radiator for efficiently dissipating heat generated from, for example, an electronic component, and more specifically, a heat dissipating fin in which a plurality of small fins in which a tip side is divided into cracks is formed by a digging tool. It is related with the manufacturing method of the tip crack heat radiation fin which has.

  For example, in order to dissipate heat generated from an electronic component such as a semiconductor integrated circuit, a radiator in which a plurality of thin radiating fins are formed using a shaving tool has been proposed. As a method of forming such a heat sink, for example, in Japanese Patent Laid-Open No. 2001-156224 (Patent Document 1), a projecting part for fin-formed fin formation is formed on the upper surface side of a heat sink material made of an aluminum alloy extruded profile. Then, a method of manufacturing a radiator is disclosed in which the fin forming work part is cut and raised using a cutting tool such as a cutting tool, thereby forming a plurality of fins.

  JP 2005-142247 A (Patent Document 2) discloses, as shown in FIG. 7, a metal plate 100 having good thermal conductivity and a digging tool 101 in which a blade portion is formed on the tip side in the moving direction. Are moved relative to each other in a state having a predetermined angle, and the metal plate 100 is dug down so that the plate-like heat radiation fins 102 are integrally formed upright, and then the work surface on which the heat radiation fins are formed upright. The metal plate 100 and the digging tool 101 are moved relative to each other from the upstream side of the formation pitch, and the metal plate 100 is dug up to form the next plate-like heat radiation fin 102 upright integrally. A method of manufacturing a radiator in which a plurality of plate-like heat radiation fins 102 are continuously formed on a metal plate 100 by sequentially repeating the steps is disclosed.

JP 2001-156224 A JP 2005-142247 A

  As is well known, the heat dissipation efficiency of a radiator varies particularly with the surface area. Since the manufacturing method shown in Patent Document 1 or Patent Document 2 described above can form a large number of thin plate-shaped heat radiation fins 102 as shown in FIG. 8, the surface area can be increased by these heat radiation fins 102. Is possible. For this reason, the heat dissipation efficiency as a heatsink compared to a heatsink manufactured by extruding or casting a metal material with good thermal conductivity made of aluminum, which has been generally used in the past. Can be greatly increased. However, in recent electronic devices or electrical equipment for automobiles, needs for lightness, thinness, and smallness are accelerated, and the appearance of a heatsink having higher heat dissipation efficiency while being small is desired. In the manufacturing method shown in the above, there is a limit in forming more plate-like heat radiation fins, and therefore there is a problem that the heat radiation efficiency in the heat radiator cannot be further increased.

  Therefore, an object of the present invention is to provide a method for manufacturing a heat radiating fin capable of greatly increasing the surface area so that the heat radiation efficiency can be improved even with a small heat radiator.

In order to solve the above-described problems, the method for manufacturing a cracked heat dissipating fin according to the invention of claim 1 includes a metal plate such as aluminum or copper having good thermal conductivity, and a blade portion formed on the tip side in the moving direction. The metal plate and the digging tool are moved relative to each other in a state having a predetermined angle, and from the upstream side of the formation pitch than the work surface formed in advance on the metal plate. By digging up the metal plate with the blade part of the digging tool, the digging process of standing up and forming plate-like radiating fins is repeated sequentially to form a plurality of the radiating fins of a predetermined size on the metal plate in succession. A method of manufacturing a heat dissipating fin,
Relative movement of the metal plate and the digging tool from the upstream side of the formation pitch with respect to the work surface, and digging the metal plate shallowly with the digging tool, is smaller than the radiating fin of a predetermined dimension. A small-sized fin forming step of standing and integrally forming a small fin, and repeating the small-sized fin forming step a plurality of times to form n small-sized fins upright, and then forming the small-sized fins upright. From the upstream side of the forming pitch from the processing surface, the radiating fin forming step of standing up and forming the radiating fin of a predetermined dimension integrally by digging up the metal plate to a predetermined depth with the digging tool,
The small fin forming step and the heat dissipating fin forming step are repeated a plurality of times, and a plurality of the heat dissipating fins, the tip side of which is divided into a cracked shape by the n small fins, are integrally raised on the metal plate. The gist is to form.

  The invention according to claim 2 is the invention according to claim 1, wherein when n small fins are erected and formed by the small fin forming step, the n th sheet from the first small fin is formed. The gist is to sequentially increase the size of the n small fins by sequentially digging up the metal plate in the metal plate until the small fins are erected.

  Furthermore, the invention described in claim 3 is the invention described in claims 1 and 2, wherein the n pieces of small fins divided in a tip-shaped manner at the tip end side of the radiating fin are thinner than the radiating fin. The gist of the present invention is to form a thin film gradually from the connecting portion of the radiating fin to the tip.

  Furthermore, the invention according to claim 4 is the invention according to claim 1 or 2, wherein the digging tool has a plurality of recesses formed in a blade portion formed on the tip side in the moving direction, and the digging tool Repeating a plurality of times a small fin forming step of standing and forming small fins integrally and a heat dissipating fin forming step of standing and integrally forming the heat dissipating fins of a predetermined size by digging up to a predetermined depth. The gist is to form a plurality of concave grooves at the positions of the n small fins and the heat radiating fins corresponding to the concave portions.

  Further, the invention according to claim 5 is the invention according to claim 4, wherein the shape of the tip side of the blade portion is rectangular, trapezoidal, triangular, sinusoidal by a plurality of recesses formed in the digging tool. The gist is that it is formed into a waveform such as.

  According to the manufacturing method of the cracked heat dissipating fin according to the present invention, the small fin forming step of digging up and forming a small fin smaller than the heat dissipating fin and integrally standing up with a tool is repeated a plurality of times to erect n small fins. After forming, the radiating fin forming process of digging up the radiating fin of a predetermined size and standing up with the tool is repeated a plurality of times, and the radiating fin is erected integrally with the metal plate. N pieces of small fins divided into shapes can be formed. In this way, by forming n small fins on the tip side of the radiating fins, the surface area of each radiating fin is increased, so that it is possible to improve the radiating efficiency even with a small radiator. Become. Also, in the radiator, the heat capacity is large when external heat is transmitted to the metal plate, and a large heat conduction path is required to transmit this heat capacity, but the metal plate has thick heat radiation fins. Since it is erected integrally, heat can be radiated and dissipated with a small loss by this radiating fin. Thereafter, a small heat conduction path may be used when the heat capacity is reduced as the heat moves to the tip side, and at that time, the heat is transferred to n small fins having a large surface area formed on the tip side of the radiating fin. Since heat can be dissipated with efficiency, it is possible to approach an ideal heat radiator.

  In addition, when n small fins are erected by the small fin formation process, the size of the small fins from the first to the nth sheet is increased gradually so that the radiating fin reaches the tip side. Since it is branched sequentially by the small fins, heat is gradually transferred to the small fins to dissipate heat, so that the heat dissipation efficiency can be further improved.

  By forming n small fins, which are divided in a cracked manner on the tip side of the radiating fin, thinner than the radiating fin, and gradually forming thinner from the connecting portion of the radiating fin to the tip, Heat can be transmitted and dissipated in accordance with the required heat capacity that becomes smaller as it is shifted, and the useless metal plate material that matches the heat capacity is used, so that the efficiency with respect to the material used can be increased.

  By digging and raising tools with a plurality of recesses in the blade on the tip side, the small fins and the heat dissipation fins are formed upright, making it easy to form a plurality of grooves corresponding to the recesses in the small fins and the heat dissipation fins. Can be formed. As described above, since the small fins and the heat radiation fins having a plurality of concave grooves are formed in a waveform such as a rectangular wave, a trapezoidal wave, a triangular wave, and a sine wave, the surface area is further increased. It becomes possible to raise.

  In order to form a tip-dissipating heat radiating fin having n small fins formed on the tip side from a metal plate such as aluminum or copper having good thermal conductivity, first, in the small fin forming step, the metal plate is preliminarily formed. By digging the metal plate shallowly from the upstream side of the forming pitch from the formed work surface by the blade part of the digging tool, small sized fins smaller than the heat radiating fins of a predetermined size are integrally formed upright. The small fin forming process is repeated a plurality of times, and n small fins are formed upright. After that, in the radiating fin forming step, a radiating fin of a predetermined dimension is formed by digging up a metal plate to a predetermined depth by a digging tool from the upstream side of the forming pitch from the work surface formed by standing formation of small fins. Stand up together. When the small fin forming step and the heat dissipating fin forming step are repeated a plurality of times, a plurality of heat dissipating fins whose tip side is divided into tip-shaped portions by n small fins are integrally formed upright on the metal plate. .

  Next, with reference to drawings, the manufacturing method of the cracking heat radiation fin concerning this invention is demonstrated in detail.

  FIG. 1 shows the structure of a heatsink having a cracked heat dissipating fin manufactured according to the present invention. The metal material used for the radiator 1 can be plastically processed and has a predetermined thermal conductivity, such as aluminum, aluminum alloy, copper alloy, or stainless steel. A metal plate 2 having a plate thickness is used.

  A thin plate-like heat radiation fin 4 is formed upright on one surface of the metal plate 2 following the plurality of small small fins 3. The base ends of the small fins 3 and the radiating fins 4 are integrally connected to the metal plate 2 as shown in FIG. Moreover, the front end side of the radiation fin 4 is divided | segmented into the tip crack shape by n pieces of small fins 4a. The plurality of radiating fins 4 are formed at the same angle and are erected at the same interval. Further, the plurality of heat radiating fins 4 of the radiator 1 are formed such that a base end portion connected to the metal plate 2 is formed thick, thinly formed toward the tip end portion, and is divided into tip-shaped portions. The dimension fin 4a is formed so as to gradually become thinner from the connecting portion 4b to the heat radiating fin 4 to the tip.

  Moreover, since the plate | board thickness of the radiation fin 4 is formed by digging up from the one surface of the metal plate 2, it can be made thin. For example, a thickness of about 0.03 mm to 1.0 mm is suitable for the heat radiating fins 4 of the radiator used for small electronic components. Moreover, the space | interval of each radiation fin 4 is arbitrarily set as 0.01 mm or more. In addition, you may form so that the plate | board thickness or space | interval of each radiation fin 4 may each differ. Further, the n small fins 4 a divided in a tip-shaped manner at the front end side of the radiating fins 4 are set so that the plate thickness is thinner than that of the radiating fins 4. Incidentally, the plate thickness is about 0.01 mm to 0.5 mm. Furthermore, the plate | board thickness of the radiation fin 4 is formed so that a base end part is thick and it goes to the front end direction. When the base end portion of the radiating fin 4 is thickened, the heat capacity increases, so that the heat from the metal plate 2 can be easily received. Thereafter, the heat is sequentially dissipated as it is transmitted toward the tip. For this reason, although a heat capacity becomes small as it goes to the front end direction, it can be radiated easily. Further, since the n small fins 4a are formed so as to gradually become thinner from the connecting portion 4b to the tip, the heat is sequentially radiated as heat is transferred to the tip. At this time, the heat capacity of the small fins 4a may also be reduced toward the tip. Thus, since the heat dissipation fins 4 and the small fins 4a have different thicknesses according to heat transfer and heat dissipation, the radiator 1 having high heat dissipation efficiency can be obtained.

  Next, with reference to FIG. 2, a method for manufacturing a cracked radiating fin will be described. The metal plate 2 described above has a plate thickness and a width necessary for forming the radiator 1, and the heat radiating fins 4 are formed upright on the metal plate 2.

  The digging tool 5 is formed with a blade portion 5a perpendicular to the moving direction at the tip on the bottom side, and the width thereof is set to be the same as or slightly larger than the width of the metal plate 2. Further, the digging tool 5 is attached to a driving device (not shown) inclined at a predetermined angle θ so that the rear end side becomes higher with respect to one surface of the metal plate 2. This inclination angle θ is appropriately set depending on the height of the heat radiating fins 4, the plate thickness, the material of the metal plate 2, etc., but is generally set to 5 to 20 degrees. Both sides in the width direction of the digging tool 5 are formed substantially at right angles, but both sides on the bottom surface side where the blade portion 5a is formed may be formed in a tapered shape or an arc shape that becomes narrower as it reaches the bottom surface. good.

  First, as shown by a two-dot chain line in FIG. 2 (A), after the blade portion 5a of the digging tool 5 is brought into contact with a predetermined position on one surface separated from the one end side 2a of the metal plate 2, the digging tool 5 Is inserted into the metal plate 2 at a predetermined angle θ by the drive device in the direction of the arrow, the blade portion 5a of the digging tool 5 bites into one surface of the metal plate 2, as shown by a solid line in FIG. The small fin 3 having a low height and a thin thickness is formed upright. At this time, it is desirable that the pressure for inserting the digging tool 5 into the metal plate 2 is set so as not to deform or stress the metal plate 2. For this reason, since the depth d1 into which the digging tool 5 is inserted is shallow, the height of the small fin 3 is reduced. Then, by forming the first small fins 3 upright, the workpiece surface 2 b is formed on the metal plate 2 at an inclination equal to the inclination angle of the digging tool 5.

  Next, as shown in FIG. 2B, the metal plate 2 and the digging tool 5 are relatively moved so that the blade portion 5a comes into contact with the position where the digging allowance t on the upstream side of the processing surface 2b is obtained. Let The digging allowance t is set to about 0.1 mm to 3.0 mm. Then, as shown in FIG. 2 (C), the digging tool 5 is moved in the direction of the arrow at a predetermined angle, and the first small fin 3 is formed so as to be deeper than the depth d2. The second small fin 3 having a size larger than that of the first small fin 3 is formed upright. Thereafter, the digging tool 5 is moved from the position where the digging allowance t on the upstream side of the work surface 2b formed by the standing formation of the small fins 3 is obtained, and from the time of the standing formation of the small fins 3 formed before that. Then, the small fins 3 having larger dimensions are erected repeatedly. The formation process of such a small fin 3 is terminated when the blade portion 5a reaches a predetermined depth d3 as shown in FIG.

  Thus, after forming the 1st small fin 3 in the predetermined position of the one surface spaced apart from the one end side 2a of the metal plate 2, the several small fin 3 is changed, changing the depth which digs up and bites the tool 5 sequentially. When formed sequentially, the dimensions of the plurality of small fins 3 are gradually increased.

  Then, following the standing formation of the small fins 3, the heat radiating fins 4 whose front ends are divided into tip-shaped portions by the n small fins 4a are formed. The small fins 4a are formed by a small fin forming process shown in FIGS. That is, as shown in FIG. 2 (E), as shown by a two-dot chain line at a position where an excavation allowance t upstream of the processed surface 2b formed by the small fin 3 formed last is obtained. By bringing the blade portion 5a of the digging tool 5 into contact with the blade portion 5a of the digging tool 5 and moving the blade portion 5a to dig up the metal plate 2 shallowly, a first small size smaller than a heat radiation fin 4 having a predetermined size described later is obtained. The fins 4a are formed upright integrally. Next, as shown in FIG. 2 (F), the digging tool 5 as shown by a two-dot chain line at a position where the digging allowance t upstream of the work surface 2b formed by the small fins 4a is obtained. The blade portion 5a of the digging tool 5 is moved deeper than the first small fin 4a so that the size becomes larger than the first small fin 4a. The second small fins 4a are formed upright. Thereafter, similarly, the digging tool 5 blade portion 5a is moved deeper than the second small fin 4a, and the third small fin 4a having a larger dimension than the second small fin 4a is formed upright. . As in the embodiment shown in FIG. 2, when forming the trident small fin 4a on the tip side of the radiating fin 4, the small fin forming step is performed when the third small fin 4a is formed upright. Exit once.

  After the small fin forming process, the process proceeds to the heat radiating fin forming process. As shown in FIG. 2 (G), the radiating fin forming step is a digging tool 5 from a position where a digging allowance t on the upstream side of the work surface 2b formed by the standing formation of the third small fin 4a is obtained. The blade portion 5a is moved until it reaches the depth d4, and the metal plate 2 is dug up to a predetermined depth, whereby the heat radiation fins 4 having a predetermined dimension are integrally formed upright.

  In this way, by performing the radiating fin forming step after the small sized fin forming step, the leading end side of the radiating fin 4 is n = 3 small sized toward the tip from the connecting portion 4b as shown in FIG. It is divided into a cracked shape by the fins 4a.

  Next, the process proceeds to the small fin formation process again, and from the position where the excavation allowance t on the upstream side of the processed surface 2b formed by the standing formation of the radiation fins 4 is obtained, as in FIG. After the metal plate 2 is dug shallowly by the digging tool 5, the first small fins 4a smaller than the heat radiating fins 4 are integrally formed upright, and then the first through third small pieces are formed as in FIG. The fin 4a is formed upright. Thereafter, the process proceeds to the radiating fin formation process again, and the second radiating fin 4 is integrally formed by digging up the metal plate 2 to a predetermined depth by the blade portion 5a of the digging tool 5 as in FIG. 2 (G). Stand up and form.

  Thereafter, as shown in FIG. 2 (H), the above-described small fin forming step and heat radiating fin forming step are repeated a plurality of times, whereby the tip side of the metal plate 2 is cracked by three small fins 4a. The n number of heat dissipating fins 4 divided into a single shape are integrally formed upright, and the heat radiator 1 shown in FIG. 1 is manufactured. Further, a bottom portion 2c is formed between the adjacent radiating fins 4 by leaving the processed surface 2b. The plate thickness of the bottom portion 2 is about 1/2 to 1/5 thinner than the original plate thickness of the metal plate 2.

  In the above-described embodiment, an example is shown in which the small fins 4a are divided in a tip-shaped manner by three small fins 4a from the connecting portion 4b of the heat radiating fin 4 toward the tip, but the number n of the small fins 4a is two or more. Any number of can be set. However, it goes without saying that the number n is naturally limited by the thickness of the small fins and the thickness of the radiating fins. In the example shown in FIG. 4, the tip of the heat radiating fin 4 is divided into five pieces by the small fins 4 a. The dimensions of the five small fins 4a are different from each other so as to increase in order from the small fin 4a formed on the first sheet to the small fin 4a formed on the fifth sheet. In order to form such a small fin 4a, the depth at which the metal plate 2 is dug by the digging tool 5 in the small fin forming step shown in FIGS. It is formed by deepening sequentially as it reaches the sheet. In this way, by varying the digging depth, the connecting portions 4b of the radiating fins 4 are arranged in a line substantially perpendicular to the metal plate 2 as shown in FIG.

  FIG. 5 shows an example in which the radiating fin 4 is divided into a tip-like shape by two small fins 4a from the connecting portion 4b to the tip. In this example, the tips of the small fins 4a formed on the adjacent radiating fins 4 are formed so as to be joined to the tips of the small fins 4a on both sides. When formed in this way, a closed pipe portion 5 is formed between the joined tip and one surface of the metal plate 2. When the liquid refrigerant is circulated between the radiating fins and the small fins as the radiator 1, the refrigerant circulates through the pipe portion 5, so that leakage to the other is reduced and the heat radiation efficiency can be improved. Become.

  FIG. 6 shows a method of forming a heat dissipating fin and n small fins in a corrugated shape to further increase the surface area. The digging tool 10 used in this embodiment is substantially the same as the digging tool 5 used in the above-described embodiment, except that the digging tool 10 is perpendicular to the moving direction at the bottom end. That is, a plurality of substantially trapezoidal concave portions 11 are formed at equal intervals.

  Then, n small fins 20a are formed by the digging tool 10 in the same process as the small fin forming process shown in FIGS. After this small fin forming step, the process proceeds to the heat dissipating fin forming step shown in FIG. 2 (G), and the metal plate 2 is dug up to a predetermined depth by the excavating tool 10 so that the heat dissipating fins 20 having a predetermined size are integrated. Stand up and form.

  Thus, by performing the radiation fin forming step after the small fin forming step, the tip end side of the radiation fin 20 is divided into a tip crack shape by the three small fins 20a from the connecting portion 20b toward the tip. The However, since a plurality of substantially trapezoidal concave portions 11 are formed in the blade portion 10a of the digging tool 10, the small fins 20a and the radiating fins 20 are dug up by the concave portions 11 with a small size. A plurality of concave grooves 12 are formed in the fins 20 a and the heat radiating fins 20 at positions corresponding to the concave portions 11. By forming the concave grooves 12, the surface areas of the small fins 20a and the heat radiating fins 20 are larger than the surface areas of the small fins 4a and the heat radiating fins 4 described above. improves.

  FIG. 6 shows an example in which a plurality of substantially trapezoidal wavy concave grooves 12 are formed in the small fins 20a and the heat radiating fins 20 when a plurality of substantially trapezoidal corrugated concave portions 11 are formed at equal intervals in the blade portion 10a of the digging tool 10. Is shown. As described above, the shape of the concave grooves 12 formed in the small fins 20 a and the heat radiation fins 20 is determined according to the shape of the plurality of concave portions 11 formed in the blade portion 10 a of the digging tool 10. Therefore, by changing the shape of the plurality of recesses 11 formed in the blade portion 10a of the digging tool 10 to various waveforms such as a rectangular waveform other than the trapezoidal waveform, a triangular waveform, and a sine waveform, a small fin having an arbitrary waveform 20a and the radiation fin 20 can be formed. Moreover, the recessed part 11 formed in the blade part 10a of the digging tool 10 may be formed not at regular intervals, but at all or part of the interval, or the width of the recessed part 11 may be varied.

  Thus, by forming a plurality of substantially trapezoidal, rectangular, triangular, sinusoidal, etc. concave grooves on the small fins 20a and the radiating fins 20, the surface areas of the small fins 20a and the radiating fins 20 are reduced. Since it becomes large, it becomes possible to further improve the thermal radiation efficiency as the heat radiator 1. FIG.

  Further, as a modification of the blade portion 10a of the digging tool 10 shown in FIG. 6, when a plurality of recesses 11 are formed in a rectangular wave shape and the depth of the recesses 11 is significantly increased, a portion corresponding to the recesses 11 Therefore, the small fins 20a and the heat radiating fins 20 are not formed upright. For this reason, the small fins 20a and the heat radiating fins 20 are erected only at locations corresponding to the blade portions 10a of the digging and raising tool 10 at intervals. Therefore, a plurality of rows of small fins 20a and heat radiating fins 20 having a narrow width are formed upright on the metal plate 2.

  Although the present invention has been specifically described above based on the embodiments, it is needless to say that the present invention is not limited to the above embodiments and can be variously modified without departing from the gist thereof. For example, as a metal plate, in addition to a plate-like metal material such as aluminum or copper having a good thermal conductivity, processing or post-processing is performed, for example, printed wiring having the metal material as a core. In order to dissipate heat generated by the substrate, the light emitting element, etc., a heat dissipating fin may be formed on a part of a metal holding member, a case that requires a heat dissipating function, or the like.

It is a perspective view which shows the outline | summary of the manufacturing method of the tip crack radiation fin concerning this invention. (A) thru | or (H) is process explanatory drawing which shows the process of forming the front crack heat radiation fin concerning this invention. It is an expanded sectional view of a tip crack radiating fin. It is sectional drawing which shows the thermal radiation fin divided | segmented into the front crack shape by the five small fins. It is sectional drawing which shows the thermal radiation fin divided | segmented into the front crack shape by the two small fins. It is a perspective view which shows the method of forming in a radiation fin waveform. It is principal part sectional drawing which shows the formation method of the conventional heat radiator. It is explanatory drawing which shows the radiation fin formed with the formation method of the conventional radiator.

DESCRIPTION OF SYMBOLS 1 Radiator 2 Metal plate 2a One end 2b Work surface 3 Small fin 4 Radiation fin 4a Small fin 5 Digging tool 5a Blade part t Digging allowance

Claims (5)

A metal plate such as aluminum or copper with good thermal conductivity and a digging tool having a blade formed on the tip side in the moving direction, the metal plate and the digging tool in a state having a predetermined angle The plate-shaped heat radiation fins are integrally raised by digging the metal plate with the blade portion of the digging tool from the upstream side of the formation pitch from the work surface previously formed on the metal plate by relative movement. A method of manufacturing a heat radiating fin in which a plurality of heat radiating fins having a predetermined size are continuously formed on the metal plate by sequentially repeating the digging process to be formed,
Relative movement of the metal plate and the digging tool from the upstream side of the formation pitch with respect to the work surface, and digging the metal plate shallowly with the digging tool, is smaller than the radiating fin of a predetermined dimension. A small-sized fin forming step of standing and integrally forming a small fin, and repeating the small-sized fin forming step a plurality of times to form n small-sized fins upright, and then forming the small-sized fins upright. From the upstream side of the forming pitch from the processing surface, the radiating fin forming step of standing up and forming the radiating fin of a predetermined dimension integrally by digging up the metal plate to a predetermined depth with the digging tool,
The small fin forming step and the heat radiating fin forming step are repeated a plurality of times, and a plurality of the heat radiating fins, the tip side of which is divided into a cracked shape by the n small fins on the metal plate, are integrally formed upright. A manufacturing method of a cracked radiating fin characterized by:   When the n small fins are erected by the small fin forming process, the digging tool is formed on the metal plate until the nth small fin is erected from the first small fin. The manufacturing method of the tip crack radiation fin of Claim 1 which forms the dimension of n said small-sized fins sequentially large by digging up deeply sequentially.   The n pieces of small-sized fins that are divided in a tip-shaped manner on the tip side of the heat radiating fins are formed thinner than the heat radiating fins, and gradually formed thinner from the connecting portion of the heat radiating fins to the tip. Item 3. A method for producing a cracked radiating fin according to Item 1 or 2.   The digging tool has a plurality of recesses formed in the blade portion formed on the tip side in the moving direction, and digs up to a predetermined depth with a small fin forming step of standing up and forming small fins integrally with the digging tool. The heat dissipating fin forming step of standing and integrally forming the heat dissipating fins having a predetermined dimension is repeated a plurality of times to form a plurality of concave grooves at the positions of the n small fins and the heat dissipating fins corresponding to the plural concavities The manufacturing method of the tip crack radiating fin of Claim 1 and 2 to form.   The manufacturing method of the tip crack radiation fin of Claim 4 which formed the shape of the front end side of a blade part into a waveform, such as a rectangular wave, a trapezoid wave, a triangular wave, a sine wave, by the some recessed part formed in the digging tool.

Images