JP2017017134A - Radiator manufacturing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radiator manufacturing apparatus capable of manufacturing a heat sink with no deformation or burrs at its end with a small number of steps.SOLUTION: The manufacturing apparatus 20 includes a lower die 21, an upper die 22, a workpiece support 23, and a workpiece retainer 24. The lower die 21 includes two lower shear blades 26 provided with a distance obtained by adding a shaving working margin of a second portion 40B on both sides of a first portion 40A to the length of the first portion 40A serving as the scrap in a workpiece 40, and a plurality of recessed grooves 27 formed in both side portions of the lower shear blades 26 on the upper surface of the lower die 21 and fitting the projecting pieces 42 serving as radiation fins of the workpiece 40. The upper die 22 includes two upper shearing blades 28 for shearing the work 40 together with the lower shear blade 26 of the lower die 21, and two shaving blade portions 29 provided on the upper side of the upper shearing blade 28 and subjected to shaving processing to the shaving processing allowance of the second portion 40B.SELECTED DRAWING: Figure 5

Description

  The present invention relates to an apparatus for manufacturing a radiator used in a liquid cooling type cooling apparatus for cooling a heating element made of an electronic component such as a semiconductor element.

  In this specification and claims, the top and bottom of FIGS.

  In this specification and claims, the term “aluminum” includes aluminum alloys in addition to pure aluminum.

  For example, liquid-cooled cooling devices that cool power devices (semiconductor elements) such as IGBTs (Insulated Gate Bipolar Transistors) used in power conversion devices mounted on electric vehicles, hybrid vehicles, trains, etc. And a casing made of a peripheral wall and a radiator disposed in the casing, and the casing allows the coolant to flow from the coolant inlet, the coolant outlet, and the coolant inlet to the coolant outlet. The heat sink has a corrugated shape including a wave crest portion and a wave bottom portion extending in the flow direction of the coolant in the coolant flow path, and a connecting portion connecting the wave crest portion and the wave bottom portion, and the wave crest portion of the radiator There is known a liquid-cooling type cooling device in which the bottom of the wave is brazed to the bottom wall of the casing (see Patent Document 1).

  In the liquid cooling type cooling device described in Patent Document 1, a heating element is attached to the outer surface of the top wall of the casing, and heat generated from the heating element is dissipated to the cooling liquid flowing through the cooling liquid flow path via the radiator. It has become so.

  By the way, in the liquid cooling type cooling device described in Patent Document 1, it is effective to increase the thickness of the radiator in order to improve the heat dissipation performance to the cooling liquid, but if the thickness of the radiator is increased, Since it is difficult to manufacture a radiator from a plate material, the thickness of the radiator is limited, and as a result, there is a limit to improving the heat dissipation performance.

  Therefore, an aluminum heat dissipation comprising a plate-shaped heat dissipation base and a plurality of heat dissipating fins integrally formed on one side of the heat dissipation base so as to rise up with respect to the heat dissipation base and in parallel with each other at intervals. It is considered to use a vessel. Such a radiator is provided in one piece with a long base flat plate portion and a flat surface on one side of the flat plate portion, extending in the longitudinal direction of the flat plate portion, and spaced apart from each other. A method of manufacturing an extruded aluminum workpiece made of a plurality of fin projecting pieces by cutting the workpiece into a predetermined length with a cutting device is preferable for efficiently manufacturing a radiator.

  By the way, a long base flat plate portion, and a plurality of fin protrusions that are raised on one side of the flat plate portion with respect to the flat plate portion, extend in the longitudinal direction of the flat plate portion, and are integrally provided at intervals. As a device for cutting an aluminum extruded workpiece made of a piece, it is equipped with a lower mold that supports the work and an upper mold that moves up and down relatively with respect to the lower mold. The upper die has a plurality of concave grooves that are formed so that one end faces the lower shearing blade portion on the upper surface of the lower die and into which the projecting piece of the workpiece is fitted. An apparatus having one upper shearing blade part that cuts a workpiece together with the part has been proposed (see Patent Document 2).

  However, when a heat sink is manufactured by cutting a workpiece with the apparatus described in Patent Document 2, there is a possibility that a sheared surface and a fracture surface exist on the end face of the heat sink, resulting in a rough state. As a result, deformation or flash occurs at the end of the, and the dimensional accuracy in the longitudinal direction decreases. Therefore, there is a problem that the number of man-hours increases because it is necessary to perform finishing.

JP 2012-29663 A JP 2001-310213 A

  An object of the present invention is to solve the above-described problems and provide a radiator manufacturing apparatus that can manufacture a radiator having no deformation or flash at an end portion with less man-hours.

  In order to achieve the above object, the present invention comprises the following aspects.

1) A plate-shaped metal heat dissipation base, and a plurality of metal heat dissipation fins integrally provided on one side of the heat dissipation base so as to stand up with respect to the heat dissipation base and to be parallel to each other at intervals. Using a long workpiece having the same cross-sectional shape as the radiator, and cutting the scrap at intervals in the longitudinal direction of the workpiece, the end facing the scrap cutting portion in the remaining portion of the workpiece An apparatus for manufacturing by performing shaving processing on the shaving processing cost provided in the part,
It has a lower mold, an upper mold that moves up and down relatively with respect to the lower mold, a work support that moves up and down relatively with respect to the lower mold, and a work presser that moves up and down relatively with respect to the lower mold.
The lower die has two lower shearing blade portions provided at a distance obtained by adding the shaving allowance on both sides of the first portion to the length of the first portion that becomes scrap in the workpiece, A plurality of concave grooves formed on both side portions of the lower cutting blade portion and into which portions to be heat radiation fins of the workpiece are fitted, and the upper die is provided at an interval equal to the length of the first portion to be scrap. And two upper shearing blades that shear the workpiece together with the lower cutting blade part of the lower mold, and two shavings provided on the upper side of each upper shearing blade part in the upper mold and performing a shaving process on the shaving allowance An apparatus for manufacturing a radiator, comprising a blade portion.

  2) The recess that houses the shaving debris generated by the shaving process is inclined diagonally upward from the opening of the recess in the portion that is continuous above the upper shearing blade portion of the upper mold and immediately below the shaving blade portion. The heat radiator manufacturing apparatus according to 1), which is formed.

  3) The radiator manufacturing apparatus according to 2) above, wherein an arc-shaped portion is provided in the back of the recess of the upper mold.

  4) The radiator manufacturing apparatus according to any one of 1) to 3), wherein the workpiece is made of aluminum having a purity of 99% or more.

  5) Either one of the above 1) to 4), wherein both side surfaces of the projecting piece serving as the heat radiating fin of the workpiece are perpendicular to the surface of the flat plate portion serving as the heat radiating base provided with the projecting piece. Heat sink manufacturing equipment.

  6) The protrusion height of the protrusion from the flat plate portion of the workpiece is 3 to 12 mm, the thickness of the protrusion pieces is 0.3 to 1.2 mm, and the pitch between the protrusion pieces is 0.9 to 2.2 mm. The manufacturing apparatus of the heat radiator in any one of 1) -5).

  According to the manufacturing apparatus of 1) to 6) above, the lower mold, the upper mold moving up and down relatively with respect to the lower mold, the workpiece support moving up and down relatively with respect to the lower mold, and the lower mold A workpiece presser that moves relatively up and down is provided, and the lower die is provided at an interval obtained by adding the shaving allowance on both sides of the first portion to the length of the first portion that becomes scrap in the workpiece. Two lower shearing blade portions, and a plurality of concave grooves formed on both side portions of both lower cutting blade portions on the upper surface of the lower die and into which portions to be heat radiation fins of the workpiece are fitted, and the upper die is scrap Two upper shearing blade portions that are provided at an interval equal to the length of the first portion and that shear the workpiece together with the lower cutting blade portion of the lower mold, and are provided above each upper shearing blade portion in the upper mold, And two shavings that are shaved for the shaving allowance. Since the workpiece is supported by the workpiece support, the part that becomes the heat radiation fin of the workpiece is inserted into the groove in the lower mold, and the workpiece is held down by holding the workpiece. Is moved downward relative to the lower die, so that scraps are removed from the workpiece by the lower shear blade portion of the lower die and the upper shear blade portion of the upper die, and at the same time, the remaining of the workpiece by the upper shaving blade portion. A shaving process can be applied to the end of the part that faces the scrap cutting part. Therefore, by repeating such an operation while moving the workpiece in the longitudinal direction, the dimensional accuracy is improved without finishing, and there is no deformation or burr at the ends of the heat dissipation base and the heat dissipation fin. A radiator can be manufactured. As a result, man-hours can be reduced compared with the case where the apparatus described in Patent Document 2 is used, and the manufacturing cost can be reduced.

  According to the manufacturing apparatus of 2) above, shaving debris generated during shaving processing by the upper shaving blade portion can be accommodated in the recess.

  According to the manufacturing apparatus of 3) above, shaving debris generated during shaving processing by the upper die shaving blade is housed in a recess in a state of being rounded into a cylindrical shape. For example, the upper die reaches the bottom dead center and is shaved. When the processing is completed, the shaving residue can be easily discharged by pushing the shaving residue from the direction in which the recess extends by some means.

  According to the manufacturing apparatus of 4) above, the thermal conductivity of the manufactured radiator is increased, and the heat dissipation performance is improved. By the way, since a workpiece made of aluminum having a purity of 99% or more is soft, when the apparatus described in Patent Document 2 is used, deformation and burrs are likely to occur particularly at the end portion. According to the apparatus, it is possible to manufacture a radiator in which deformation and burrs are not present at the end portions of the heat dissipation base and the heat dissipation fin with less man-hours.

  According to the manufacturing apparatus of 5) above, it is possible to reduce the distance between adjacent radiating fins of the manufactured radiator, and the number of radiating fins per unit area increases. Therefore, the heat dissipation performance is improved.

  According to the manufacturing apparatus of 6) above, it is possible to achieve downsizing while suppressing a decrease in the heat dissipation performance of the manufactured radiator.

It is a disassembled perspective view which shows the liquid cooling type cooling device which has the heat radiator manufactured by the manufacturing apparatus of this invention. FIG. 2 is a vertical sectional view of the liquid cooling type cooling device of FIG. 1. It is the sectional view on the AA line of FIG. FIG. 3 is a sectional view taken along line B-B in FIG. 2. It is the vertical sectional view seen from the side perpendicular to the longitudinal direction of the work which shows the manufacturing device of this invention. It is CC sectional view taken on the line of FIG. FIG. 6 is an enlarged vertical sectional view showing an upper mold of the manufacturing apparatus of FIG. 5. FIG. 6 is a vertical cross-sectional view corresponding to FIG. 5 showing a method of manufacturing a radiator using the manufacturing apparatus of FIG. 5 in order of steps. FIG. 8 is a view corresponding to FIG. 7 showing a modification of the upper mold used in the manufacturing apparatus of FIG. 5.

  Embodiments of the present invention will be described below with reference to the drawings.

  In this specification, the term “aluminum” includes aluminum alloys in addition to pure aluminum.

  1 to 4 show a liquid cooling type cooling apparatus having a radiator manufactured by the manufacturing apparatus of the present invention, and FIGS. 5 to 7 show the manufacturing apparatus of the present invention. Moreover, FIG. 8 shows the method of manufacturing a heat radiator using the manufacturing apparatus of this invention in the order of steps.

  In the following description of the liquid cooling type cooling device, the downstream side in the coolant flow direction (the right side in FIGS. 2 and 3) is referred to as the front, and the opposite side is referred to as the rear. Let (left and right in FIG. 4) be left and right. The top and bottom in FIGS. 2 and 4 are referred to as top and bottom.

  1 to 4, the liquid cooling type cooling device (1) is fixed to an aluminum casing (2) having a top wall (2a), a bottom wall (2b) and a peripheral wall (2c), and the casing (2). And an aluminum extruded shape radiator (3).

  The casing (2) is a box-shaped aluminum lower component member (4) that opens upward and forms a bottom wall (2b) and a peripheral wall (2c), and a plate-shaped aluminum upper member that forms a top wall (2a). An outward-facing flange comprising a component member (5), wherein a constant width portion near the periphery of the upper component member (5) is integrally provided at the upper end of the portion constituting the peripheral wall (2c) of the lower component member (4) It is brazed to the upper surface of (4a). In the casing (2), the coolant flows from one side (rear side) in the longitudinal direction of the casing (2) to the other side (front side), and more than the coolant channel (6). An inlet header portion (7) that is located upstream (rear side) and into which the coolant flows, and an outlet header portion that is located further downstream (front side) than the coolant channel (6) and from which the coolant flows out ( And 8). A coolant inlet (9) leading to the inlet header (7) is provided at the center in the left-right direction of the rear portion of the bottom wall (2b) of the casing (2), and the bottom wall (2b) of the casing (2) A coolant outlet (11) communicating with the outlet header (8) is provided at the center in the left-right direction of the front portion. The end of the aluminum inlet pipe (12) that feeds the coolant into the inlet header (7) is inserted into the coolant inlet (9) of the casing (2) and brazed to the bottom wall (2b) for cooling. An end of an aluminum outlet pipe (13) that sends out the coolant from the outlet header (8) is inserted into the liquid outlet (11) and brazed to the bottom wall (2b).

  Used to fix the radiator (3) to the casing (2) on either the top wall (2a) or the bottom wall (2b) of the casing (2), here the top wall (2a) The square opening (14) to be formed is formed so as to face the coolant flow path (6).

  The radiator (3) has a rectangular plate shape larger than the opening (14) of the casing (2), and the first surface (15a) (lower surface) faces the coolant channel (6) and the second surface. The heat dissipating base (15) provided with the heat generating element mounting portion (F) for attaching the heat generating element (P) to the surface (15b) (upper surface), and the heat dissipating base (15) on the first surface (15a) of the heat dissipating base (15) ), And a plurality of vertical plate-like heat dissipating fins (16) extending in the front-rear direction so as to be parallel and spaced apart in the left-right direction. The radiator (3) is disposed in the casing (2), and a constant width portion near the periphery of the second surface (15b) of the heat dissipation base (15) is located on the lower surface of the top wall (2a) of the casing (2). A portion around the opening (14) is brazed, and the heat dissipating fin (16) protrudes into the coolant channel (6). The tips of the radiation fins (16) are brazed to the inner surface of the bottom wall (2b) of the casing (2). The tips of all the radiation fins (16) may be brazed to the inner surface of the bottom wall (2b), or only the tips of some of the radiation fins (16) are brazed to the inner surface of the bottom wall (2b). It may be.

  The radiator (3) is preferably made of aluminum having a purity of 99% or more. Moreover, it is preferable that the left and right side surfaces of the heat radiating fin (16) are perpendicular to the first surface (15a) provided with the heat radiating fin (16) of the heat radiating base (15). Furthermore, the protrusion height from the 1st surface (15a) of the radiation base (15) in a radiation fin (16) is 3-12 mm, and the thickness of a radiation fin (16) is 0.3-1.2 mm, 2 adjacent. The pitch, which is the distance between the thickness direction centers of the two radiating fins (16), is preferably 0.9 to 2.2 mm. In either case, the heat dissipation performance of the radiator (3) is improved, and the radiator (3) can be reduced in size and weight.

  The heating element (P) is a power device such as an IGBT, an IGBT module in which the IGBT is integrated with a control circuit and stored in the same package, or a protection circuit integrated with the IGBT module and stored in the same package. It consists of an intelligent power module or the like, and is attached to a heating element mounting portion (F) provided on the second surface (15b) of the heat dissipation base (15) of the radiator (3) via an electric insulating member (not shown).

  In the liquid cooling type cooling device (1) having the above-described configuration, the coolant flowing from the inlet pipe (12) through the coolant inlet (9) into the inlet header (7) enters the coolant channel (6). It flows forward between the adjacent radiator fins (16) of the arranged radiator (3) and between the radiator fins (16) and the peripheral wall (2c) at both front and rear ends. The coolant that has flowed forward through the coolant channel (6) enters the outlet header (8), passes through the coolant outlet (11), and is sent out to the outlet pipe (13). The heat generated from the heating element (P) is radiated to the coolant flowing in the coolant channel (6) through the radiation base (15) and the radiation fin (16) of the radiator (3), and the heating element (P ) Is cooled.

In the embodiment described above, the opening (14) is formed in the top wall (2a) of the casing (2), but conversely, the opening (14) is formed in the bottom wall (2b) of the casing (2). Formed,
It may be. In this case, the radiator (3) is disposed in the casing (2) so as to be upside down from the above-described embodiment, and has a constant width near the periphery of the second surface (15b) of the heat dissipation base (15). The part is brazed to the part around the opening (14) on the upper surface of the bottom wall (2b) of the casing (2), and the radiation fin (16) protrudes into the coolant channel (6), so that at least part of the heat radiation The tips of the fins (16) are brazed to the inner surface of the top wall (2a) of the casing (2).

  The radiator (3) uses a manufacturing apparatus (20) as shown in FIGS. 5 to 7, and the long workpiece (40) to the workpiece (40) having the same cross-sectional shape as the radiator (3). The scrap is cut out at intervals in the longitudinal direction of the workpiece, and the shaving process is performed on the end of the remaining portion of the work (40) facing the scrap cutting portion. The workpiece (40) is made of an extruded aluminum material, and has a long base flat plate portion (41) and a flat plate portion (41) on one side of the flat plate portion (41) and a flat plate portion (41). 41) and a plurality of fin projecting pieces (42) provided integrally in the longitudinal direction and spaced apart from each other. The first part that becomes scrap in the work (40) is indicated by (40A), and the second part remaining on both sides of the scrap excision part is indicated by (40B). The second part (40B) is composed of a part serving as a radiator (3) and a shaving machining allowance provided on both front and rear sides of the part serving as a radiator (3) and subjected to the shaving process described above. The length in the front-rear direction of the portion (40B) is a length obtained by adding two shaving processing allowances to the length in the front-rear direction of the radiator (3).

  In the following description of the manufacturing apparatus (20), the forward direction (right side in FIG. 5) of the work (40) is referred to as the front, and the opposite side is referred to as the rear. Left and right) are called left and right.

  The manufacturing apparatus (20) includes a lower mold (21), an upper mold (22) that moves up and down relatively with respect to the lower mold (21), and a workpiece support that moves up and down relatively with respect to the lower mold (21) ( 23) and a work presser (24) that moves up and down relatively with respect to the lower mold (21). Here, the lower mold (21) is fixed, and the upper mold (22), the work support (23) and the work presser (24) move up and down.

  The lower die (21) has a length in the front-rear direction added to the length of the first part (40A) of the workpiece (40) plus the shaving allowance for the second part (40B) on both sides of the first part (40A). The lower die (21) and the lower die (21) in which the scrap generated by cutting the first part (40A) is discharged downward and the upper die (22) that is lowered and the lower die enters Lower shear blade portions (26) provided on both front and rear side edges of the mold hole (25), and formed on the upper surface of the lower mold (21) on both front and rear sides of the mold hole (25), and the protrusion of the work (40) A plurality of concave grooves (27) into which the pieces (42) are fitted. Since the lower shearing blade part (26) is provided at both front and rear edge portions of the mold hole (25) in the lower mold (21), the lower mold (21) is disposed in the front-rear direction in the front-rear direction of the first part (40A). It has two lower shearing blade portions (25) provided at a distance obtained by adding the shaving allowance of the second portion (40B) on both sides of the first portion (40A) to the length in the direction.

  As shown in detail in FIG. 7, the upper die (22) is provided at both front and rear side edges of the lower end, and shears the work (40) together with the lower shear blade portion (26) of the lower die (21). Two upper shearing blade portions (28) for cutting out the first portion (40A) from the workpiece (40), and provided on the upper portion of each upper shearing blade portion (28) on both the front and rear sides of the upper die (22); It has two shaving blade parts (29) which perform shaving processing instead of the shaving processing margin of the end of the 2nd portion (40B). The upper shearing blade portion (28) is provided in the front-rear direction at an interval equal to the length of the first portion (40A) of the work (40) in the front-rear direction. The upper die (22) is opened at both the front and rear side surfaces of the upper die (22) at a height position above both upper shearing blade portions (28) and directly below both shaving blade portions (29). ), A recess (31) inclined upward toward the center in the front-rear direction is formed. The upper and lower surfaces of the recess (31) are each inclined upward toward the center portion in the front-rear direction of the upper mold (22), and the inner side of the recess (31) has an arc shape. The recess (31) is formed immediately below the shaving blade (29), and the shaving blade (29) has an acute angle. The left and right ends of the recess (31) are open to the left and right sides of the upper mold (22).

  Next, a method for manufacturing the radiator (3) using the manufacturing apparatus (20) will be described with reference to FIG.

  First, as shown in FIGS. 5 and 6, the upper die (22) and the work retainer (24) are moved upward, and the upper surface of the work support (23) is flush with the upper surface of the lower die (21). The workpiece (40) is sent to the manufacturing apparatus (20) from behind and placed on the workpiece support (23).

  Next, the upper die (22), the workpiece support (23) and the workpiece retainer (24) are lowered to fit the protruding piece (42) of the workpiece (40) into the recessed groove (27) of the lower die (21). The flat plate portion (41) is supported by the upper surface of the lower mold (21) and the work support (23) (see FIG. 8 (a)).

  Next, the upper die (22) is further lowered, and the work (40) is sheared between the first part (40A) and the second part (40B) on both sides of the first part (40A), The scrap (43) consisting of the part (40A) is cut out, and the rear end of the part that becomes the radiator (3) is shaved before the lower mold (21) mold hole (25) in the work (40). A semi-finished product (44) having a margin is formed (see FIG. 8 (b)).

Next, the upper die (22) is further lowered to the bottom dead center, and the shaving blade (29) is subjected to shaving processing for the shaving processing of the semi-finished product (44), and the semi-finished product (44) is connected to the radiator (3). To do. At the same time, a shaving process is applied to the shaving allowance for the front end of the second part (40B) remaining on the rear side of the scrap cutting part of the work (40). The shaving residue (45) generated during the shaving process is accommodated in a cylindrical shape in the recess (31) of the upper mold (22) (see FIG. 8 (c)).
Next, the shaving residue (45) is pushed out from the inside of the recess (31) from either the left or right side by an appropriate device (not shown) (see FIG. 8D).

  Thereafter, the upper die (22), the workpiece support (23) and the workpiece holder (24) are raised, and the radiator (3) is taken out (see FIG. 8 (e)). By repeating such an operation, the radiator (3) is continuously manufactured.

  FIG. 9 shows a modification of the upper mold used in the manufacturing apparatus (20) described above.

  In the case of the upper mold (50) shown in FIG. 9, the upper surface of the recess (52) provided immediately below the shaving blade (51) and containing the shaving residue is horizontal, and the shaving blade (51) is at a right angle. It has become. The lower surface of the recess (52) is inclined downward from the center of the upper mold (50) in the front-rear direction toward the outside.

  The radiator manufacturing apparatus according to the present invention is suitable for manufacturing a radiator of a liquid-cooled cooling device that cools a power device such as an IGBT used in a power converter mounted in an electric vehicle, a hybrid vehicle, a train, or the like. Used for.

(3): Heatsink
(15): Heat dissipation base
(16): Radiation fin
(20): Radiator manufacturing equipment
(21): Lower mold
(22) (50): Upper mold
(23): Work support
(24): Workpiece holder
(25): Mold hole
(26): Lower shear blade
(27): Groove
(28): Upper shearing blade
(29) (51): Shaving blade
(31) (52): Recess
(40): Work
(40A): 1st part
(40B): Second part
(41): Flat plate
(42): Protruding piece
(43): Scrap
(44): Semi-finished product
(45): Shaving residue

Claims (6)

It consists of a plate-shaped metal heat dissipation base and a plurality of metal heat dissipation fins that are integrally formed on one side of the heat dissipation base so as to rise up with respect to the heat dissipation base and to be parallel to each other with a space between each other. Use a long work piece with the same cross-sectional shape as the heat dissipator, cut the scrap at intervals in the longitudinal direction of the work piece, and at the end facing the scrap cut part in the remaining part of the work piece An apparatus that is manufactured by performing shaving processing on the provided shaving processing cost,
It has a lower mold, an upper mold that moves up and down relatively with respect to the lower mold, a work support that moves up and down relatively with respect to the lower mold, and a work presser that moves up and down relatively with respect to the lower mold.
The lower die has two lower shearing blade portions provided at a distance obtained by adding the shaving allowance on both sides of the first portion to the length of the first portion that becomes scrap in the workpiece, A plurality of concave grooves formed on both side portions of the lower cutting blade portion and into which portions to be heat radiation fins of the workpiece are fitted, and the upper die is provided at an interval equal to the length of the first portion to be scrap. And two upper shearing blades that shear the workpiece together with the lower cutting blade part of the lower mold, and two shavings provided on the upper side of each upper shearing blade part in the upper mold and performing a shaving process on the shaving allowance An apparatus for manufacturing a radiator, comprising a blade portion. A recess that accommodates shaving residue generated by the shaving process is formed in a portion that is continuous above the upper shearing blade portion of the upper mold and immediately below the shaving blade portion so as to be inclined obliquely upward from the opening of the recess. The heat sink manufacturing apparatus according to claim 1. The heat radiator manufacturing apparatus according to claim 2, wherein an arc-shaped portion is provided in a back portion of the recess of the upper mold. The apparatus for manufacturing a radiator according to any one of claims 1 to 3, wherein the workpiece is made of aluminum having a purity of 99% or more. The heat radiator according to any one of claims 1 to 4, wherein both side surfaces of the projecting piece serving as a heat radiating fin of the workpiece are perpendicular to a surface of the flat plate portion serving as a heat radiating base. Manufacturing equipment. The protrusion height from the flat plate portion of the protruding piece of the workpiece is 3 to 12 mm, the thickness of the protruding pieces is 0.3 to 1.2 mm, and the pitch between the protruding pieces is 0.9 to 2.2 mm. The manufacturing apparatus of the heat radiator in any one of -5.

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