JP5042702B2 - Manufacturing method of plate fin type radiator - Google Patents

Description

  The present invention relates to a method of manufacturing a radiator for attaching to a heat-generating mechanical / electrical component and lowering the temperature by heat dissipation, and in particular, a plate fin having a plurality of plate fins spaced apart from each other on a heat dissipation substrate. The present invention relates to a method of manufacturing a mold radiator.

  In various electronic devices such as personal computers and television receivers, as well as in railway vehicles and automobiles, a heatsink is indispensable for a stable operation in an installed power supply unit, motor unit, control unit, or the like. In particular, a heat sink is used for cooling an electronic device.

  As a radiator, a so-called plate fin type radiator having a structure in which a plurality of plate fins serving as radiating fins are arranged upright at predetermined intervals on a radiating board serving as a base is generally used. Plate fin type radiators can be broadly classified according to the manufacturing method. Plate fins and heat dissipation substrates are manufactured separately and plate fins are joined to the heat dissipation substrate. Plate fins and heat dissipation substrates are formed by metal extrusion. Are integrally molded, and a plate fin and a heat dissipation substrate are integrally molded from a metal block material by cutting with a multi-wire saw.

  Among these plate fin type radiators, a plate fin type radiator (hereinafter, simply referred to as “heat radiator”) in which a plate fin manufactured separately and a heat radiating substrate are joined is conventionally disclosed in Patent Document 1. There is a manufacturing method as disclosed in the above. In this conventional manufacturing method, a plurality of interval holding plates longer than the length of the plate fins are prepared as jigs, and the interval holding plates are alternately stacked with the plate fins so that both end portions protrude from both ends of the plate fins. . This is placed through a brazing material while standing on the heat dissipation substrate, and the plate fin and the heat dissipation substrate are brazed and joined by heating. And the space | interval holding plate which is a jig | tool is removed from between plate fins, and a heat radiator is obtained.

Japanese Patent No. 3160633

  However, in the above-described conventional radiator manufacturing method, the spacing plate as a jig protrudes from both ends of the plate fin and widely exists from end to end of the plate fin. Excess heat mass becomes excessive. As a result, the heating time required for brazing becomes long.

  Further, since the interval holding plates as the jigs are individually separated, when removing, the interval holding plates must be removed one by one from between the plate fins. As a result, the removal of the spacing plate becomes complicated and the time required for it becomes long.

  Therefore, when manufacturing the radiator, high production efficiency cannot be expected, and the manufacturing cost must be deteriorated. In particular, in the manufacture of a heat sink for cooling an electronic device in a radiator, there is a strong demand for improvement in production efficiency in order to reduce manufacturing costs.

  Then, this invention is made | formed in view of said problem, and it aims at providing the manufacturing method of the plate fin type radiator which can manufacture a plate fin type radiator with high production efficiency.

  In order to achieve the above object, a method of manufacturing a radiator according to the present invention is a method of manufacturing a plate fin type radiator including a plurality of plate fins spaced apart from each other on a heat dissipation substrate, and includes the following steps. . A plurality of spacing plates that are shorter than the length of the plate fins are arranged in a row, alternately overlapping with the plate fins, and the rod-shaped member that passes through each spacing plate is suspended on the top of the plate fins. Process. A joining process of brazing plate fins placed on a heat dissipation board via a brazing material to the heat dissipation board. And the removal process which extracts a space | interval holding plate with a rod-shaped member.

  With such a configuration, the spacing plate as a jig exists only in a part of the range of the plate fin in the length direction, and therefore, an excessive heat mass can be reduced during brazing additional heat. As a result, the heating time required for brazing can be suppressed to a short time. In addition, since the interval holding plates as jigs are connected and integrated through the rod-like member, all the interval holding plates can be extracted from the plate fins and removed at the time of removal. As a result, the jig can be easily removed in a short time. A heat sink is suitable as the radiator here.

  Here, from the viewpoint of sufficiently suppressing the deformation of the plate fins in the joining step, it is preferable that the spacing plate is arranged in a plurality of rows in the length direction of the plate fins in the setting step.

  In order to further strengthen the bonding between the plate fin and the heat dissipation substrate, it is preferable that a load is applied toward the heat dissipation substrate in a portion of the upper end of the plate fin that is separated from the spacing plate in the bonding step.

  According to the radiator manufacturing method of the present invention, the heating time required for brazing can be reduced to a short time, and the jig can be easily removed in a short time. With efficiency, a plate fin type radiator including a heat sink can be manufactured.

Hereinafter, an embodiment of a method for manufacturing a plate fin type radiator of the present invention will be described in detail with reference to the drawings .

FIG. 1 is a view showing the appearance of a radiator manufactured by a plate fin type radiator manufacturing method according to an embodiment of the present invention. FIG. 1 (a) is a top view and FIG. 1 (b) is a front view. FIG. 4C is a side view.

  As shown in the figure, the plate fin type radiator 1 in this embodiment includes a rectangular heat radiating substrate 2 having flat upper and lower surfaces, and a horizontally long and rectangular plate fin 3 standing on the heat radiating substrate 2. Consists of. Both the heat dissipation substrate 2 and the plate fin 3 are metal molded products such as copper, aluminum and alloys thereof having high thermal conductivity. For example, pure aluminum (# 1000 series), Al-Mn alloy (# 3000 series), An Al—Mg—Si alloy (6000 series) is preferably used.

  A plurality of plate fins 3 are arranged on the heat radiating board 2 at a predetermined interval, and their lower ends are joined to the heat radiating board 2 by brazing with a brazing material 4. The radiator 1 has a structure in which the plate fin 3 is not provided on the peripheral edge of the heat radiating substrate 2. The radiator 1 is suitably used as a heat sink for cooling electronic devices.

  A method for manufacturing such a radiator 1 will be described below.

2A and 2B are views showing the appearance of a single spacing plate applied to a method for manufacturing a plate fin-type radiator according to an embodiment of the present invention. FIG. 2A is a plan view and FIG. 2B is a side view. FIG. In the present embodiment, a plurality of strip-shaped interval holding plates 10 are used as jigs for brazing the plate fins 3 to the heat dissipation substrate 2 as shown in FIG. The spacing plate 10 is a metal molded product having the same material as that of the heat dissipation substrate 2 and the plate fin 3, that is, the same coefficient of thermal expansion, and its width w is the length L of the plate fin 3 (FIGS. 1A and 1B). See below.) In the present embodiment, the width w of the spacing plate 10 is about 1/10 of the length L of the plate fin 3.

  The thickness t of the spacing plate 10 is set to the desired thickness C of the gap between the plate fins 3 (see FIGS. 1A and 1C). A through hole 11 is formed in the upper portion of the spacing plate 10. The dimension x from the lower end of the spacing plate 10 to the position where the through hole 11 is formed is made smaller than the height H of the plate fin 3 (see FIGS. 1B and 1C). A rod-like member 12 described later is inserted into the through hole 11.

Figure 3 is a diagram showing the appearance of the radiator in a state assembled with the jig in the manufacturing method of the plate-fin heat sink according to an embodiment of the present invention, FIG. (A) is a top view, FIG. ( b) is a front view, and FIG.

  As shown in the figure, in manufacturing the radiator 1, first, the interval holding plates 10 are alternately overlapped with the plate fins 3 so that the upper portions of the interval holding plates 10 protrude from the upper ends of the plate fins 3. To place. One rod-like member 12 is inserted from the spacing member 10 at one end to the spacing member 10 at the other end into the through hole 11 at the top of each spacing member 10 protruding from the upper end of the plate fin 3. As the rod-like member 12 here, a wire having a certain degree of rigidity, an elongated metal pin, or the like is used.

  In this way, the spacing plates 10 are sandwiched between the required number of plate fins 3, respectively, and are placed on the heat dissipation substrate 2 in a standing manner. At this time, the brazing material 4 is preliminarily applied on the heat dissipation substrate 2, the sheet-like brazing material 4 is stacked, or a clad plate in which the brazing material 4 is laminated on both surfaces is stacked. That is, the brazing material 4 is interposed between the lower end of the plate fin 3 and the heat dissipation substrate 2.

  Further, in a state where the plate fins 3 are placed on the heat radiating substrate 2, the interval holding plates 10 are connected and integrated by the bar-shaped members 12 penetrating each of the plate-shaped members 12. It will be in a state of being caught on the upper end of the. Thereby, each space | interval holding | maintenance board 10 is put in the state suspended by the appearance which floated from the thermal radiation board | substrate 2. As shown in FIG.

  In the present embodiment, the interval holding plates 10 through which the rod-like members 12 are inserted are arranged at three positions, that is, both end portions and a central portion in the length direction of the plate fins 3. In other words, the spacing plates 10 are arranged in three rows in the length direction of the plate fins 3.

  This completes the setting, and the process proceeds to the joining of the plate fins 3 and the heat dissipation board 2 by brazing.

  The heat radiating substrate 2 on which the plate fins 3 are placed is placed in a heating furnace together with the spacing plate 10 and the rod-shaped member 12 including the spacing plate 10, and heated at a predetermined temperature at which the brazing material 4 is melted. At that time, at the upper end of the plate fin 3, a portion deviating from the region where the spacing plate 10 is present, that is, in this embodiment, between each end portion and the central portion in the length direction of the plate fin 3 is used for pressurization. A jig is applied and a load is applied toward the heat dissipation substrate 2. If it does so, the lower end of the plate fin 3 and the thermal radiation board | substrate 2 will be brazed by the brazing | wax material 4 mutually pressing, and both will be joined firmly.

  When the heating for a predetermined time has passed and the joining is completed, the process proceeds to removal of the interval holding plate 10 as a jig.

  Here, the both ends of the rod-shaped member 12 are gripped and pulled upward. Then, the interval holding plates 10 integrated and connected by the rod-shaped member 12 are extracted from between the plate fins 3 at once.

  Thus, the spacing plate 10 and the rod-like member 12 are removed, and as a result, the plate fin type radiator 1 shown in FIG. 1 is obtained.

  According to the manufacturing method of this embodiment, since the spacing plate 10 serving as a jig exists only in a part of the range of the plate fin 3 in the length direction, extra heat is applied during the brazing heat. Heat mass can be reduced. Therefore, the heating time required for brazing can be suppressed to a short time.

  In addition, since the interval holding plates 10 serving as jigs are connected and integrated through the rod-shaped members 12, all the interval holding plates 10 together with the rod-shaped members 12 are removed at once when the plate fins 3 are removed. Can be removed from between the two. Therefore, it is possible to easily remove the jig in a short time.

  As a result, the radiator 1 can be manufactured with high production efficiency. In particular, it is possible to manufacture a heat sink for cooling electronic equipment, which has a strong demand for cost reduction, with high production efficiency.

  Further, since the interval holding plate 10 serving as a jig is floated from the heat radiating substrate 2, the lower end of the interval holding plate 10 is in contact with the brazing material 4 on the heat radiating substrate 2 during brazing. In other words, the spacing plate 10 and the heat dissipation substrate 2 are never inadvertently joined.

  In addition, in this embodiment, since the interval holding plates 10 are arranged in three rows in the length direction of the plate fins 3, an area for restricting the posture of the plate fins 3 is increased. As a result, deformation such as undulation of the plate fins 3 can be sufficiently suppressed during brazing addition heat, and as a result, a high-quality radiator 1 can be obtained. However, the arrangement number of the spacing plates 10 may be increased or decreased in consideration of the deformation allowance of the plate fins 3.

  In the present embodiment, only one gap holding plate 10 is inserted between the plate fins 3 in the setting, but a plurality of gap holding plates 10 can be overlapped. For example, when the thickness of the desired gap between the plate fins 3 is 10 mm and the thickness of the prepared spacing plate 10 is 5 mm, the two spacing plates 10 are overlapped and placed between the plate fins 3. be able to.

  In addition, compared with the conventional manufacturing method, the conventional manufacturing method uses a very long interval holding plate extending from both ends of the plate fin, while the manufacturing method of the present embodiment uses an interval holding plate shorter than the plate fin. Therefore, it is possible to reduce the amount of material used for the jig, resulting in a reduction in manufacturing costs.

  Such a manufacturing method of the present embodiment is particularly effective for manufacturing a large radiator 1 including the long plate fins 3. For example, the plate fin 3 is suitable for a plate having a length of 100 to 1000 mm, a height of 50 to 200 mm, and a thickness of about 0.6 to 3.0 mm. It is preferable that the width corresponding to the length of the plate fin 3 is about 10 to 100 mm and the thickness is about 0.5 to 20.0 mm.

Others The invention is not limited to the implementation form described above, without departing from the scope of the present invention, various modifications are possible.

  According to the manufacturing method of the plate fin type radiator of the present invention, it is possible to perform brazing addition heat and jig removal in a short time, and the radiator can be manufactured with high production efficiency. Therefore, the present invention is extremely useful for manufacturing a heat radiator, in particular, a heat sink, for which further cost reduction is desired.

It is a figure which shows the external appearance of the heat radiator manufactured by the manufacturing method of the plate fin type heat radiator which is one Embodiment of this invention, The figure (a) is a top view, The figure (b) is a front view, The figure (C) is a side view. It is a figure which shows the external appearance of the space | interval holding | maintenance board single-piece | unit applied to the manufacturing method of the plate fin type heat radiator which is one Embodiment of this invention, The figure (a) is a top view, The figure (b) is a side view. . It is a figure which shows the external appearance of the heat sink in the state which assembled | attached the jig | tool in the manufacturing method of the plate fin type heat radiator which is one Embodiment of this invention, The figure (a) is a top view, The figure (b) is the figure. A front view and the figure (c) are side views .

1 plate-fin radiator 2 radiating board 3, 3A, 3B plate fins 4 brazing material 10 space holding plate 11 through hole 12 rod-like member

Claims (3)

A method of manufacturing a plate fin type radiator comprising a plurality of plate fins spaced apart from each other on a heat dissipation substrate,
A plurality of spacing plates that are shorter than the length of the plate fins are arranged in a row, alternately overlapping with the plate fins, and the rod-shaped member that passes through each spacing plate is suspended on the top of the plate fins. Process,
A bonding step of brazing the plate fins placed on the heat dissipation substrate via the brazing material to the heat dissipation substrate;
A step of removing the spacing plate together with the rod-shaped member.   2. The method of manufacturing a plate fin-type radiator according to claim 1, wherein, in the setting step, a plurality of the spacing plates are arranged in a length direction of the plate fin.   3. The plate fin-type radiator according to claim 1, wherein a load is applied toward a portion of the upper end of the plate fin that is separated from the gap maintaining plate toward the heat radiating substrate. Method.

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