JPS6348640B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION According to the present invention, a metal support part having a thickness approximately equal to the thickness of the fins and a height equal to or greater than the thickness of the fins is placed almost perpendicularly on a metal seat plate at a predetermined interval. The metal seat plate and the metal supporting part are extruded into one body, and the metal fins are directly or indirectly soldered onto the metal supporting part of the metal seat plate. The present invention relates to a method of joining heat dissipation fins.

As shown in FIG. 6, in the conventional method of joining heat dissipation fins, the seat plate 21 of the heat dissipation fin 26 requires a certain degree of strength in order to be attached to an electronic component, so the plate thickness is large. The thickness of the fin 24, which is soldered onto the seat plate 21, should be as thin as possible, for example, about 3 mm thick.
mm. Between the thick seat plate 21 and the thin fins 24, the thick seat plate 21 has a large heat capacity, while the thin fins 24 have a small heat capacity, so if the seat plate and the fins are heated under the same conditions, the temperature of the seat plate will rise. Since the temperature rise is much later than the temperature rise of the fin, it is not possible to properly solder the seat plate and the fin. Therefore, in the past, it was necessary to provide heating conditions so that the temperatures of the seat plate and the fins were almost the same at the soldering temperature. For example, as shown in Figure 7, the temperature inside the furnace was set to 200℃
Leave the seat plate and fins for 15 to 20 minutes until the temperature rises to about 200℃, then raise the temperature inside the furnace to about 550℃, and then let the seat plate and fins cool. After leaving the furnace for 15 to 20 minutes until the temperature rises to around 550°C, the temperature inside the furnace is raised from 600°C to around 620°C and the seat plate and fins are brazed together, so the brazing time between the seat plate and fins is The disadvantage is that it takes a long time.

The purpose of this invention is to solve the disadvantage of the conventional method of joining heat dissipation fins, which requires a long time due to the stepwise temperature rise, and to reduce the difference in temperature rise between the seat plate part and the fin part, and to perform brazing joining in a short time. That is.

In the method for joining heat dissipation fins of the present invention, the upper side of the metal base plate, which has a large plate thickness and a large heat receiving capacity, has a thickness that is approximately the same as the thickness of the metal fin, and a height that is greater than or equal to the thickness of the fin. Metal supports having a height of The metal seat plate and the metal support portion are extruded and provided as one body.

By making the thickness of this support part as thin as the thickness of the fins, the heat capacity of the support part becomes almost the same as that of the fins, and the height of the support part is made higher than the thickness of the fins. As a result, the temperature of the tip of the support part increases as quickly as the fins when the temperature rises.

The tip of the support provided on the upper side of the seat plate may have any suitable shape such as a flat shape, an inverted V-shape, a V-shape, or a wavy shape.
Since the volume of the tip decreases, the temperature of the tip of the support part rises faster during heating, and when the pipe fin is used as a fin for soldering, the pipe fin and the tip of the support part are brazed in a stable state. Therefore, it is preferable that the tip of the support part be in an inverted V shape.

The method of joining the heat dissipation fins of this invention is to form a support part on the upper side of the seat plate, the thickness of which is approximately the thickness of the fin, and the height of which is greater than the thickness of the fin, and the seat plate and the support part are formed into one body. The fins are placed directly or indirectly on the support and soldered together using a composite brazing sheet, so the temperature rises quickly at the tip of the support. This method allows the seat plate and the fin to be brazed together in a short time because the temperature rise with the fin continues to rise almost simultaneously under the same conditions.

Next, an example will be described.

Example 1 An aluminum alloy support part 2 is extruded and provided on the upper side of an aluminum alloy seat plate 1 in one piece.

This support part 2 has a thickness of about 2 mm and a height of about 3 mm.
Install them perpendicularly to the seat plate 1 at 10 mm intervals.

A composite brazing sheet 3 is interposed on a support part 2 provided on this seat plate 1, and fins 4 are provided at predetermined intervals.

The composite brazing sheet 3 is made by cladding a 1.6 mm thick aluminum alloy sheet with 0.2 mm thick brazing material on both the upper and lower surfaces.

A composite brazing sheet 3 is placed on the support portion 2 of this seat plate 1, and then the composite brazing sheet 3
Fix the end of a fin with a thickness of 2 mm on top with a jig (not shown) and place it in a heating furnace to a predetermined temperature, approx.
The heat dissipation fins 5 are made by heating to 620°C and soldering.

Example 2 An aluminum alloy support part 12 is extruded and provided in one piece on the upper side of an aluminum alloy seat plate 11,
In addition, the tip of the support portion 12 is formed into an inverted V shape.

The thickness of this support portion 12 is approximately 3 mm, and the height is approximately 8 mm.
They are installed almost perpendicularly to the seat plate 11 at intervals of about 10 mm.

On the support part 12 provided on the seat plate 11, a pipe fin 14 with a wall thickness of 1.0 mm is laminated with brazing material clad on the outside, fixed with a jig, heated in a heating furnace, and soldered together. Then, the heat dissipation fins 16 are manufactured.

In the heat dissipation fin 16 of this second embodiment, the support portion 12
Since the tip of the support part is shaped like an inverted V shape, the volume of the tip is reduced, so when the tip is heated and soldered, the temperature of the tip of the support rises faster, and the temperature rises almost in the same way as the pipe fin 14, so the soldering can be done quickly. This can be done smoothly, and since the pipe fin 14 is supported by the inverted V-shaped tip of the supporting part 12 and the inverted V-shaped tip of the adjacent supporting part 12, the pipe fin 14 is in the opposite position of both supporting parts even before soldering. It can be stably placed on the tip of the V-shape, and even after soldering, the soldering can be performed more firmly.

[Brief explanation of drawings]

Figure 1 is a front view before joining, Figure 2 is a front view after joining, Figure 3 is a front view of another embodiment after joining, and Figures 4 and 5 are front views of different seat plates. Figure, 6th
The figure is a front view of a conventional heat dissipation fin, and FIG. 7 is a graph of a conventional soldering method. 1 is a seat plate, 2 is a support part, 3 is a composite brazing sheet, 4 is a fin, and 5 is a heat radiation fin.

Claims (1)

[Claims] 1. A metal seat plate in which metal support parts having a thickness approximately the same as the thickness of the fins and a height equal to or greater than the thickness of the fins are provided almost vertically at predetermined intervals on the upper side of the metal seat plate. 1. A method for joining heat dissipating fins, which comprises extruding and molding a metal support part into one body, and brazing the metal fin onto the metal support part of the metal seat plate.