JP2009088417A - Heat sink having heat-dissipation fin, and method of manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat sink having a planar heat-dissipation fin capable of preventing injuries by contacts of hands, fingers and the like from occurring by bending the extremity of the knife-edged dissipation fin, and easily bending the extremity of the heat-dissipation fin, and to provide a method of manufacturing the same. <P>SOLUTION: The extremity can be formed as knife-edged by cutting one side of a metal plate 2 excellent in coefficient of thermal conductivity with the edge 5a of a cutting tool 5. At the same time, a plurality of heat-dissipation fins 4 in planar shapes gradually thickening to their base ends are integrally formed upright with the metal plate 2, to bend the knife-edged extremities of the heat-dissipation fins 4 substantially parallel to one side of the metal plate 2. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a radiator for efficiently radiating heat generated from, for example, an electronic component, and more specifically, a radiator having a plate-like radiation fin integrally formed upright on a metal plate by a cutting tool and a method for manufacturing the same. About.

  For example, in order to dissipate heat generated from an electronic component such as a semiconductor integrated circuit, a heat dissipator that has been generally put to practical use has a number of comb-shaped heat dissipating fins standing vertically on a base. By directly or indirectly joining the radiator to an electronic component or the like, heat is radiated outward through the radiation fins of the radiator. This radiator is usually manufactured by extruding or casting a metal material having good thermal conductivity made of aluminum.

Moreover, the manufacturing method of the radiator which forms a radiation fin using a cutting tool is disclosed by Unexamined-Japanese-Patent No. 2005-142247 (patent document 1) and Unexamined-Japanese-Patent No. 2001-177025 (patent document 2). Yes.
In the manufacturing method of the radiator shown in Patent Document 1, a hoop-shaped metal plate having a good thermal conductivity and a cutting tool having a blade portion formed on the tip side in the moving direction have a predetermined angle. The plate-shaped radiating fins are erected integrally by digging up the hoop-shaped metal plate by relative movement in the state, and then from the upstream side of the formation pitch from the work surface on which the radiating fins are erected. The hoop-like metal plate and the cutting tool are moved relative to each other, and the hoop-like metal plate is dug up to integrally form the next plate-shaped heat radiation fin. Thereafter, the cutting process is sequentially repeated to sequentially form the hoop-like metal plate. It is disclosed that a plurality of heat radiation fins are continuously formed on a plate.

  The radiator shown in Patent Document 2 is provided with a plurality of tongue-like fins on one surface of a heat dissipation substrate, the tip of each tongue-like fin is formed in an arc shape, and only the central portion of the entire arc-shaped tip portion is formed. It is disclosed that a curled portion is formed by bending forward, and that both end portions other than the central portion are left as arc-shaped portions without being bent.

JP 2005-142247 A JP 2001-177025 A

  Since the plate-shaped heat radiation fin in the heat radiator shown in Patent Document 1 digs down the hoop-shaped metal plate with a cutting tool, the tip is sharply formed. For this reason, there is a problem that the finger may be injured by touching the tip of the radiating fin with a finger or the like.

  Tongue fins in the radiator shown in Patent Document 2 are formed in a uniform thick tongue shape from the base end to the tip, and the height of the tongue fins falls within a predetermined tolerance range. Of the whole arcuate tip, only the center is bent. However, since the tongue-shaped fin is formed in a uniform thick tongue shape from the base end to the tip, there is little risk of cutting the hand, but only the center of the tip is bent For this reason, there is a potential problem that the hand is cut in portions other than the curled portion. In addition, the curled portion has a curled portion forming member attached to the upper end of the cutting tool so as to project forward, and the tip of the tongue-shaped fin that tries to extend upward is abutted against the curled portion forming member. Thus, the tip is bent forward. However, since the load of the cutting tool increases rapidly because the curled portion forming member is bent sharply, the predetermined tongue-shaped fin height cannot be obtained, and the bending angle is insufficient. In addition, when a hand is applied from the front of the tip, the problem of cutting the hand by the tip still remains.

  Therefore, the object of the present invention is to bend the tip of the radiating fin formed in the shape of a knife edge, so that it is possible to prevent injuries and the like due to contact with fingers and the like, and the tip of the radiating fin is easy. An object of the present invention is to provide a radiator having a plate-like heat radiation fin that can be bent and formed and a method for manufacturing the same.

  In order to solve the above-described problems, a radiator having a plate-like heat radiation fin according to the present invention has a tip formed by cutting one side of a metal plate having a good thermal conductivity with a blade portion of a cutting tool. A plurality of radiating fins that are formed in an edge shape and are formed upright integrally with the metal plate so that the plate thickness gradually increases toward the proximal end side, and the radiating fin has a knife edge shape. Is bent in a direction substantially parallel to one surface of the metal plate.

  Further, the radiating fin is formed by digging down one side of the metal plate by a blade portion of the cutting tool, the proximal end of the radiating fin is located on the other side of the one side of the metal plate, The knife-edge tip of the radiation fin protrudes upward from one side of the metal plate, the knife-edge tip is curled to a radius of curvature smaller than the base end, and the knife-edge tip is the metal It is oriented in the direction of one side of the board.

  A radiator having a plate-like radiation fin is a state in which a metal plate such as aluminum or copper having a good thermal conductivity and a cutting tool having a blade portion formed on the tip side in the moving direction have a predetermined angle. By relatively moving and cutting the metal plate with the blade portion of the cutting tool, the plate-like heat radiation fins are integrally formed upright, and more than the work surface formed by the upright formation of the heat radiation fins. The metal plate and the cutting tool are relatively moved from the upstream side of the pitch, and the metal plate is cut by the cutting tool to integrally stand and form the next plate-like heat radiation fin, and thereafter the cutting process. Are sequentially repeated to form a plurality of the heat radiating fins on the metal plate, and then pressed from the front end side of the plurality of the heat radiating fins with a pressing tool, so that the knife-edge-shaped tip and one surface of the metal plate are Almost It is prepared by bent in the row direction.

  By cutting the metal plate with the blade part of the cutting tool, when the plate-like heat radiation fin is integrally formed upright, it is curled so that the radius of curvature on the tip side of the heat radiation fin is smaller than the base end side. When the pressing tool is pressed from the tip side of the radiating fin, it is desirable that the direction of the knife-edge tip is directed to the one surface of the metal plate.

  According to the radiator having the plate-like heat radiating fin according to the present invention, the knife edge-shaped tip formed by cutting with the blade portion of the cutting tool is bent, so that injuries due to contact with fingers and the like can be prevented. It can be prevented in advance. In addition, since the knife-edge tip is bent in a direction substantially parallel to one side of the metal plate, there is an accident that cuts the hand with the knife-edge tip even if the fingers move in the front-rear direction. Is prevented.

  In addition, when the tip of the radiating fin projecting upward from one side of the metal plate is curled to a small radius of curvature, the knife-edge tip side is directed toward the one side of the metal plate, so that Injuries and the like can be prevented without contacting the knife-edge tip. In addition, since the knife-edge-shaped tip is disposed between the adjacent radiating fins, it is possible to prevent the radiating fins from being deformed or damaged by being prevented from being caught by other radiators or parts. .

  In addition, by cutting the metal plate with the cutting tool blade and standing up integrally with the plate-like heat radiation fin, the plate thickness gradually increases toward the proximal end side, and the distal end side is made thinner. The tip of the radiating fin having a knife edge shape can be easily bent in the direction substantially parallel to the one surface of the metal plate with a small pressing force by pressing the knife edge.

  When plate-like radiating fins are erected integrally, curling so that the radius of curvature on the distal end side of the radiating fin is smaller than that on the proximal end side, so that the pressing tool is in a direction substantially parallel to one surface of the metal plate. When bent, the curled knife-edge tip can be directed to one side of the metal plate, making it easy to manufacture a heatsink that can prevent fingers and other injuries caused by the knife-edge tip. It becomes.

  A radiator having a plate-like radiating fin is formed by cutting one side of a metal plate made of aluminum, copper, or the like having a good thermal conductivity with a blade of a cutting tool so that the tip is formed into a knife edge shape. A plurality of radiating fins formed in a plate shape so as to gradually increase in thickness toward the end side are formed upright integrally with the metal plate. The knife-edge tip of the radiation fin is bent and formed in a direction substantially parallel to one surface of the metal plate.

  The radiating fin has a knife-edge-shaped tip side curled to a radius of curvature smaller than the base-end side, and the knife-edge-shaped tip is directed in the direction of one surface of the metal plate by bending.

  Further, in order to manufacture a radiator having plate-like heat radiation fins, a metal plate such as aluminum or copper having a good thermal conductivity and a cutting tool having a blade portion formed on the front end side in the moving direction are provided in a predetermined manner. The metal plate is cut with the blade portion of the cutting tool by relative movement in a state having an angle, and thereby the plate-like heat radiation fins are integrally formed upright. Thereafter, the metal plate and the cutting tool are relatively moved from the upstream side of the forming pitch with respect to the work surface formed by standing formation of the radiation fins, and the metal plate is cut by the cutting tool. The following plate-like heat radiation fins are integrally formed upright. Thereafter, a plurality of radiating fins are continuously formed on the metal plate by sequentially repeating the cutting process. Then, it presses with the pressing tool from the front end side of a some radiation fin, and it bends and forms so that a knife-edge-shaped front end may become a substantially parallel direction with the one surface of a metal plate.

  When the plate-shaped heat radiation fin is integrally formed upright by cutting the metal plate with the blade portion of the cutting tool, the heat radiation fin is curled. At this time, the radius of curvature on the distal end side of the radiating fin is made smaller than that on the proximal end side. Thereby, when it presses with a press tool, the direction of a knife edge-shaped front-end | tip will be orient | assigned to the direction of the one surface of the said metal plate. Accordingly, each knife edge-shaped tip is disposed between the heat dissipating fins, and fingers and the like are in contact with the cylindrically curved outer surface on the front end side of the heat dissipating fin, so that there is no risk of injuries due to cutting of the hand.

  Next, a radiator having plate-like radiation fins according to the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows a configuration of a radiator having plate-like heat radiation fins 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.

  Then, at a predetermined position on one side farther from the one end side 2a of the metal plate 2, a plurality of thin plate-like heat radiation fins 4 are integrally formed at the same height following the plurality of small small fins 3. Is formed. The small fins 3 are formed so that the height increases in order from the one end side 2a of the metal plate 2 to the heat radiating fin 4 side. The base end portions of the small fins 3 and the heat radiating fins 4 are integrally connected from a recess 2 c formed on one surface of the metal plate 2. Further, the radiating fin 4 is curled as a whole from the base end to the tip. In particular, the distal end side is formed to have a smaller radius of curvature than the proximal end side. And the front-end | tip of the radiation fin 4 is formed in knife edge shape. 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 so that the base end connected to the metal plate 2 is thick, and is thinned toward the tip.

  Moreover, since the plate | board thickness of the small fin 3 and 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. Furthermore, if the plate | board thickness of the radiation fin 4 is formed so that a base end part is thick and it reaches to a front-end | tip part, since a base end part is thick, a heat capacity is large and it becomes easy to receive the heat from the metal plate 2. FIG. Thereafter, the heat is sequentially dissipated as heat is transmitted toward the tip, and the tip can be easily dissipated even with a small heat capacity. Since the heat radiation fin 4 changes the plate thickness in accordance with heat transfer and heat radiation, the heat radiator 1 having high heat radiation efficiency can be obtained.

  In the radiator 1 configured as described above, the tips of the radiation fins 4 formed in a knife edge shape are bent so as to be in a direction substantially parallel to one surface of the metal plate 2. In the embodiment shown in FIG. 1, as shown in the enlarged view in a circle, the direction d of the tip of each radiating fin 4 is directed toward the one surface of the metal plate 2 at an angle of several degrees to several tens of degrees. Yes. This is because the front end side of the radiating fin 4 is curled so as to have a smaller radius of curvature than the base end side. When the curled front end portion is bent, only the knife-edge-shaped front end hangs down. Therefore, the tip is further directed toward one surface of the metal plate 2. As a result, the tip of the knife edge is disposed between the adjacent radiating fins 4.

  Thus, when the knife-edge tip is directed in the direction of one surface of the metal plate 2, even if the fingers or the like come into contact with each other from above the plurality of radiating fins 4, the fingers and the like are formed in a cylindrical shape on the tip side. It contacts the upper surface of the radiating fin 4 and cannot contact the tip of the knife edge. Therefore, it is possible to prevent an accident such as cutting a finger or the like with this knife-edge tip.

  In addition, the bending angle of the front end of each radiation fin 4 should just be substantially parallel to one side of the metal plate 2, and from the minus angle directed in the direction of one side of the metal plate 2 as described above, It can be set to a positive angle directed in the opposite direction to the one side. In the case of the plus angle, it may be in a range that does not damage the fingers, and is preferably set to 10 degrees or less with respect to one surface of the metal plate 2.

  Next, the manufacturing method of the heat radiator 1 which has a plate-shaped radiation fin is demonstrated, referring FIG. The metal plate 2 described above has a plate thickness and a width necessary for forming the radiator 1 and is placed on a press device (not shown). Thereafter, the small fins 3 and the heat radiation fins 4 are formed upright by the cutting tool 5.

  The cutting tool 5 is formed with a blade portion 5 a perpendicular to the moving direction at the bottom end, and the width thereof is set smaller than the width of the metal plate 2. Further, the cutting tool 5 is attached to a drive device (not shown) with an inclination of a predetermined angle θ such that the rear end side is higher than the 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. Although both sides in the width direction of the cutting tool 5 are formed substantially at right angles, 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), the cutting tool 5 is brought into contact with a predetermined position on one surface farther from the one end side 2a of the metal plate 2 and then the cutting tool 5 is cut. Is inserted into the metal plate 2 in the direction of the arrow at a predetermined angle θ by the driving device, the blade portion 5a of the cutting 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 to set the pressure for inserting the cutting tool 5 into the metal plate 2 so as not to deform or stress the metal plate 2. For this reason, since the depth d1 which inserts the cutting tool 5 is shallow, the height of the small fin 3 becomes low. Then, by forming the first small fins 3 upright, the metal plate 2 is formed with a work surface 2 b that is inclined equal to the inclination angle of the cutting tool 5.

  Next, as shown in FIG. 2 (B), the metal plate 2 and the cutting tool 5 are relatively moved, and the blade portion 5a is brought into contact with a position where the cutting allowance t on the upstream side of the processing surface 2b is obtained. Let The cutting allowance t is set to about 0.1 mm to 3.0 mm. Then, as shown in FIG. 2 (C), the cutting tool 5 is moved at a predetermined angle in the direction of the arrow, and the first small fin 3 is formed to be deeper than the depth d2. The second small fins 3 higher than the first small fins 3 are formed upright. Thereafter, the cutting tool 5 is moved from a position where a cutting allowance t upstream of the work surface 2b formed by standing formation of the small fins 3 is obtained, and from the time of standing formation of the small fins 3 formed before that. Then, the erection of the higher small fin 3 is repeated. 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.

  After that, the standing of the small fins 3 is followed by the fin forming step, and the heat radiating fins 4 having the same height are formed. That is, as shown in FIG. 2 (E), the blade portion 5a of the cutting tool 5 is predetermined from a position where a cutting allowance t upstream of the work surface 2b formed by the last formed small fin 3 is obtained. The radiating fin 4 having a predetermined height is formed upright by being moved until the depth d3 is reached. Next, as shown in FIG. 2 (F), the cutting tool 5 is moved to a position upstream of the work surface 2b, and a cutting process for moving the cutting tool 5 until it reaches a predetermined depth d3 is sequentially repeated. A plurality of heat radiation fins 4 are erected at the same angle and the same interval. Then, as shown in FIG. 3, the metal plate 2 is formed with a recess 2c having a thin bottom surface, and the inner walls 2d are formed on both sides.

  In this fin forming step, when the heat radiating fins 4 are formed upright on the metal plate 2 by the cutting tool 5, the heat radiating fins 4 are formed so as to gradually become thinner as the base end side is thicker and reaches the tip. Furthermore, the radiating fin 4 is curled as a whole from the base end portion to the tip end as shown in the figure. In particular, the distal end side is formed to have a smaller radius of curvature than the proximal end side, and the distal ends of the radiation fins 4 are formed in a knife edge shape. This curling phenomenon is the same as the phenomenon when cutting wood thinly with a planer. At the beginning of cutting, the radius of curvature is formed to be small because of thinness, but after that, the radius of curvature gradually increases with increasing thickness. growing.

  Moreover, as shown in FIG. 4, the base end side of the radiation fin 4 bulges in both directions as indicated by the arrow as the plate thickness increases. For this reason, the base end side of the radiation fin 4 is joined in pressure contact with the inner wall 2d. As a result, even if the plate thickness of the radiating fin 4 is thinned to about 0.05 mm, the base end side is held by the metal plate 2, so that the mechanical strength can be increased. Moreover, since the base end side of the radiation fin 4 is thermally connected with the metal plate 2, it becomes possible to improve heat radiation efficiency.

  On the other hand, on the upstream side of the radiating fin 4 on the side opposite to the small fin 3, an inclined work surface 2b extending from the bottom surface of the recess 2c to one surface of the metal plate 2 is left as shown in FIG. ing. The inclined surface that is the surface to be processed 2b can be caused to act as a heat radiating surface. Moreover, the plate | board part 6 of the plate | board thickness which the metal plate 2 has is formed behind the to-be-processed surface 2b.

  Further, on both sides of the plurality of heat radiating fins 4 formed on the metal plate 2, flange portions 6 having a thickness of the metal plate 2 are formed. The flange portion 6 can be formed by setting the width of the cutting tool 5 to be narrower than the width of the metal plate 2. As a result, the flange 6 formed in the radiator 1 is formed so as to surround the radiation fins 4 and the small fins 3 as shown in FIG. The flange 6 is attached to the radiator 1, or an opening portion of a crown member (not shown) is bonded to the upper portion of the radiating fin 4 and sealed to constitute a liquid-cooled heat exchanger such as a heat pump or a vapor chamber. be able to.

  As described above, after the plurality of radiating fins 4 are formed upright, they are pressed by the pressing tool 10 from the front end side of the plurality of radiating fins 4 so that the knife-edge-shaped tip is substantially parallel to one surface of the metal plate 2. Bend in the direction. As shown in FIG. 5, the pressing tool 10 has a flat bottom surface facing the radiation fins 4. In addition, the area of the lower surface of the pressing tool 10 is set to be larger than the area of the entire plurality of radiation fins 4. Then, as shown in FIG. 5, when the pressing tool 10 is pressed from the front end side of the plurality of radiating fins 4, the knife edge-shaped front end is substantially parallel to one surface of the metal plate 2 as shown in the enlarged view in the circle. Bent in the direction. In the example shown in FIG. 5, as described above, the tip end side of the radiating fin 4 is curled so as to have a smaller radius of curvature than the base end side, and therefore only the knife-edge tip hangs down. The tip is further directed in the direction of one surface of the metal plate 2, and the base end side is slightly bent from the tip in a substantially cylindrical shape. As a result, the tip of the knife edge is disposed between the adjacent radiating fins 4.

  The pressure that presses the front end side of the plurality of heat dissipating fins 4 can be bent with a small pressure because the front end side of the heat dissipating fins 4 is formed thin. In addition, a spacer 11 is disposed around one surface of the metal plate 2, and the movement distance of the pressing tool 10 is defined so that the bending dimension on the tip side of the radiating fin 4 is constant.

  In addition, although the bending dimension of the front end side of the radiation fin 4 is suitably set in the range which does not damage a finger, you may make it a large bending dimension as needed. That is, as shown in FIG. 7, when the height of the heat radiation fin 4 is bent to a position of about 1 in about 3 minutes from the front end side, the front end side of the heat radiation fin 4 is greatly bent and the front end of the heat radiation fin 4 is adjacent. The heat dissipating fins 4 can be reached, and in some cases, contact can be made. At this time, if the adjacent radiating fins 4 are intentionally brought into contact with each other, the cavities 7 are formed between the adjacent radiating fins 4. When a liquid cooling heat exchanger such as a heat pump or a vapor chamber is configured, air or A fluid such as a liquid can be circulated in the cavity 7. In order not to allow the fluid in the cavity 7 to flow out, it may be sealed with a desired sealant at a place where the tip of the radiating fin 4 contacts the adjacent radiating fin 4.

  FIG. 8 shows an example in which a hoop-like metal plate 20 is used as the metal plate in the method of manufacturing a radiator having plate-like heat radiation fins according to the present invention. The hoop-like metal plate 20 can be plastically processed as in the above-described embodiments, and a material such as aluminum, an aluminum alloy, a copper alloy, or stainless steel is used as a metal material having a good thermal conductivity. .

  Also in the hoop-shaped metal plate 20, a plurality of heat radiation fins 21 are continuously formed on one surface of the hoop-shaped metal plate 20, as in the above-described embodiment. The plurality of heat radiating fins 21 are formed to have the same width as the width of the hoop-shaped metal plate 20. In order to form such a heat radiating fin 21, the cutting tool 5 having a width equal to or larger than the width of the hoop-shaped metal plate 20 is used. As described above, the plurality of heat dissipating fins 21 formed on one surface of the hoop-shaped metal plate 20 are formed so that the thickness of the base end side is thicker and the thickness is gradually reduced toward the tip, as in the above-described example. The whole curls from the end to the tip, and further, the tip side is formed to have a smaller radius of curvature than the base side, and the tip is formed in a knife edge shape.

  When a plurality of radiating fins 21 are continuously formed on such a hoop-shaped metal plate 20, a knife edge-shaped tip is bent and formed in a direction substantially parallel to one surface of the hoop-shaped metal plate 20 using the pressing roller 22. can do. As shown in the figure, the pressing roller 22 is formed in a cylindrical shape having an outer periphery 22a having a predetermined radius, and is configured to rotate around a center hole 22b. Then, by moving the pressing roller 22 in a state where a predetermined pressure is applied in the direction of the plurality of radiating fins 21, the plurality of radiating fins 21 are bent and formed in a direction substantially parallel to one surface of the hoop-shaped metal plate 20. .

  The moving direction of the pressing roller 22 is preferably the same direction as the curling direction of the plurality of radiating fins 21, but may be in the opposite direction. Further, the pressing of the plurality of radiating fins 21 may be a relative movement between the hoop-shaped metal plate 20 and the pressing roller 22, and therefore the position of the pressing roller 22 is fixed and the hoop-shaped metal plate 20 is moved. Anyway. When the hoop-shaped metal plate 20 is moved, when the plurality of radiating fins 21 are continuously formed by the cutting tool 5, the one radiating fin 21 is erected and then the next radiating fin 21 is formed. For this purpose, when the hoop-shaped metal plate 20 is fed, the tips of the radiation fins 21 may be bent by the pressing roller 22.

  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 good thermal conductivity, processing is performed or post-processing is performed, for example, a print using the metal material as a core. In order to dissipate heat generated by the wiring board, 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. In the embodiment described above, the plurality of heat radiating fins are formed in parallel to one end of the metal plate, but may be formed at a predetermined angle.

It is sectional drawing which shows an example of the heat radiator which has the plate-shaped radiation fin concerning this invention. (A) thru | or (F) is process explanatory drawing which shows the process of forming the plate-shaped radiation fin concerning this invention. It is sectional drawing which shows the intermediate state of the heat radiator formed by the process of FIG. It is front sectional drawing which shows the heat radiator shown in FIG. It is sectional drawing which shows the process of pressing the front-end | tip of a plate-shaped radiation fin. It is a perspective view which shows the heat radiator which has the plate-shaped heat radiation fin concerning this invention. It is a fragmentary sectional view which shows the other Example of the plate-shaped radiation fin concerning this invention. It is a perspective view which shows the 2nd Example of the process of pressing the front-end | tip of a radiation fin.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Radiator 2 Metal plate 4 Radiation fin 5 Cutting tool 5a Blade part 10 Press tool

Claims (4)

By cutting one side of a metal plate with good thermal conductivity with the blade of the cutting tool, the tip is formed into a knife edge shape, and the plate thickness gradually increases toward the base end side. A radiator in which a plurality of heat dissipating fins formed integrally with the metal plate are erected,
A radiator having a plate-like radiation fin, wherein a knife-edge tip of the radiation fin is bent in a direction substantially parallel to one surface of the metal plate.   The radiating fin is formed by digging down one side of the metal plate with a blade portion of the cutting tool, and the base end of the radiating fin is located on the other side of the one side of the metal plate, and the radiating fin The edge of the knife edge protrudes upward from the one surface of the metal plate, and the distal end side of the knife edge is curled to a radius of curvature smaller than that of the proximal end. The heat radiator which has the plate-shaped radiation fin of Claim 1 orient | assigned to the direction of the one surface of a board. A metal plate such as aluminum or copper having a good thermal conductivity and a cutting tool having a blade formed on the tip side in the moving direction, the metal plate and the cutting tool in a state having a predetermined angle. By relatively moving and cutting the metal plate with the blade part of the cutting tool, a plurality of radiating fins formed in a plate shape so that the plate thickness gradually increases toward the base end side is integrally formed upright. In addition, the metal plate and the cutting tool are relatively moved from the upstream side of the forming pitch from the work surface formed by the standing formation of the radiating fin, and the metal plate is cut by the cutting tool. Then, the next plate-shaped heat radiation fin is integrally formed upright, and then the cutting process is sequentially repeated to continuously form the plurality of heat radiation fins on the metal plate.
A method of manufacturing a radiator having a radiation fin, wherein a plurality of the radiation fins are pressed from a front end side by a pressing tool, and a knife-edge-shaped front end is bent in a direction substantially parallel to one surface of the metal plate. .   By cutting the metal plate with the blade part of the cutting tool, when the plate-like heat radiation fin is integrally formed upright, it is curled so that the radius of curvature on the tip side of the heat radiation fin is smaller than the base end side. The method for manufacturing a radiator having a radiation fin according to claim 3, wherein when the pressing tool is pressed from the tip side of the radiation fin, the direction of the knife-edge tip is directed to the one surface of the metal plate.

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