JP3133720B2 - Heat sink and manufacturing method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat sink comprising a large number of plate-like fins and a base plate, and a method for manufacturing the same.

[0002]

2. Description of the Related Art FIG. 11 is a partially exploded side view of a conventionally known heat sink. In this heat sink, the plate-like fin 1 which is an extruded shape member has ribs 11 and 1.
In a state where a large number of them are superposed at equal intervals via the base 2, the end 14 is brazed to the one surface 21 of the base plate 2.

[0003] The plate-like fin 1 is manufactured by extruding a long body 3 having the same shape as the plate-like fin 1 as shown in FIG. However, in the elongated body 3 obtained by extrusion molding, the dimension H of the ribs 11 and 12 is hardly always constant, and specifically, about ± 0.1.
There is a problem that a variation of about mm occurs. That is, there is a problem that the dimensions H are not uniform between the ribs 11 and 12, and the dimension H is not constant in the longitudinal direction of the ribs 11 and 12 themselves. In particular, the dimension H of the ribs 11 and 12 was greatly different between the front end and the rear end in the longitudinal direction of the elongated body 3. For this reason, the following problem has occurred.
Since the size differs from the originally planned size, the fit is poor. The number of fins with respect to the base plate is determined in advance. If the number of fins exceeds 20 to 30, the dimensions are incorrect and the number of fins is not constant. As a result, the state in which a large number of plate-like fins 1 are stacked, which causes problems such as performance degradation and cost increase, is opened upward and downward, and the quality is reduced.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and the protrusion dimensions of the ribs are uniform in the ribs and are constant in the longitudinal direction of the ribs themselves. It is an object of the present invention to obtain a heat sink having stable thermal performance and a manufacturing method capable of obtaining such a heat sink.

[0005]

In order to achieve the above object, according to the first aspect of the present invention, two plates are provided on the same side in the thickness direction of the plate.
In a heat sink in which a plurality of extruded members having at least two ribs are superposed and integrated at equal intervals via ribs, the tip of the rib has a projection having a thickness smaller than the thickness of the rib. The ribs are characterized in that the protrusion dimensions of the ribs from the plate body are corrected to be uniform in the ribs and constant in the longitudinal direction of the ribs themselves.

According to a second aspect of the present invention, an extruded member having two or more ribs on the same side in the thickness direction of the plate is formed by extruding a long member having the same shape as the extruded member. In a method of manufacturing a heat sink having a process of cutting a predetermined size later and stacking a large number of the extruded members at equal intervals via ribs, when extruding the long body, Forming an extra projection with a thickness smaller than the thickness of the rib, and after extrusion molding, correcting the projection dimension of the projection by a roller or a press, aligning the projection dimension of the rib from the plate body with the rib, and And a step of keeping the same constant in its own longitudinal direction.

[0007]

(Embodiment 1) FIG. 1 is a side view of a heat sink manufactured by the method of the present invention. In this heat sink, the plate-like fin 1 shown in FIG.
It is obtained by laminating a large number of pieces at equal intervals via the first and second parts 12 and brazing them to the one surface 21 of the base plate 2 at the edges 14 thereof. Note that the plate-like fin 1 is provided with a plate 1 and a rib 1 protruding on the same side in the thickness direction of the plate 10.
The rib 11 is provided at one edge of the plate 10, and the rib 12 is provided at the middle of the plate 10 in the vertical direction.

By the way, the plate-like fin 1 is
After forming a long body having the same shape by extrusion molding, it is cut to a predetermined size to make it. In the present invention, as shown in FIG.
As the long body 31, one having extra protrusions 111 and 121 at the tips of the ribs 11 and 12 is formed by extrusion molding. Then, as shown in FIG. 4, the long body 31 is corrected by the roller 4. That is, the rib 11 including the protrusion 111
The rib 1 including the protrusion size and the protrusion 121 from the plate body 10 of FIG.
The protrusions 111 and 121 are crushed by the roller 4 so that the protrusion size from the second plate body 10 is the same and the protrusion size is constant in the longitudinal direction of the ribs 11 and 12.

Specifically, for example, as shown in FIG.
Projection dimension X1 of rib 11 including projection 111 = 2.65
mm, the protrusion size X2 of the rib 12 including the protrusion 121 =
The long body 31 (left in the figure) which is 2.55 mm is X3 =
It is corrected to become a long body 31 (right in the figure) of 2.50 ± 0.03 mm. The size of the protrusions 11 and 12 is, as shown in FIG.
m, thickness W = 0.2-0.4 mm.

When the long body 31 thus corrected is cut into a predetermined size to produce a large number of plate-like fins 1, the respective projecting dimensions of the ribs 11 and 12 from the plate body 10 are equal in each plate-like fin 1 itself. And the protrusion dimensions are ribs 11,
12 are constant in the longitudinal direction. In addition, the plate-like fin 1
The ribs 11 and 12 have the same protrusion dimensions from the plate body 10.

Therefore, when a heat sink is formed using such a plate-like fin 1, the following operation and effect can be obtained. That is, since the plate-shaped fins 1 are finished to the expected dimensions, a state in which a large number of the plate-shaped fins 1 are superimposed is very good, and the plate-shaped fins 1 are finished to the expected dimensions. Therefore, the number of fins with respect to the base plate can be made to be a predetermined value, so that the problems of performance degradation and cost increase due to the inconsistent number of fins can be avoided.
Since a large number of are superimposed into a stable rectangular parallelepiped instead of being opened upward or downward, the quality is improved.

The straight body 31 may be corrected by a press 5 as shown in FIG.

(Embodiment 2) FIG. 7 is a side view of a heat sink manufactured by the method of the present invention. This heat sink is configured by superposing a large number of plate-shaped extruded members 6 shown in FIG. 8 and joining each other with solder or brazing material 7. That is, the extruded profile 6 is composed of the plate 10 and the plate 1
0, the ribs 11 and 12 and the protrusion 61 projecting to the same side in the thickness direction.
Three. The rib 11 is provided at one end of the plate 10, the rib 12 is provided at the middle of the plate 10 in the vertical direction, and the projection 61 is provided at the other end of the plate 10.

The extruded profile 6 has ribs 11, 12,
A large number of pieces are superposed at regular intervals via the solder 13, and in this state, the gaps formed below the ribs 13 are densely filled with the solder or the brazing material 7 and joined to each other. In this heat sink, the base plate 2 is constituted by the convex portions 61 and the filled solder or brazing material 7, and the plate-like fins 1 are constituted by other portions.
In order to densely fill the gap below the rib 13 with the solder or brazing material 7, the gap portion of the extruded profiles 6 in a state where a large number of pieces are overlapped with each other is melted in the molten solder or molten brazing material in the bath. , And in that state, an ultrasonic wave may be applied to the extruded member 6 or the bath.

The extruded profile 6 is manufactured by extruding a long body having the same shape as the extruded profile 6 and then cutting it to a predetermined size. In the present invention, as shown in FIG. The ribs 11 and 12 and the ribs 13 of the convex portion 61 are used as the elongated body 32.
Are formed by extrusion molding, each having extra projections 111, 121, 131 at the tip end. Then, similarly to the case of FIG. 4, the long body 32 is corrected by the roller 4. That is, the protrusion dimension of the rib 11 including the protrusion 111 from the plate 10 and the plate 10 of the rib 12 including the protrusion 121
From the plate body 10 so as to be the same as the protrusion size from the plate body 10 including the protrusion 131 and the rib 13.
The protrusions 111, 121, 131 are crushed by the roller 4 so that the protrusion dimension is constant in the longitudinal direction of the ribs 11, 12, 13.

More specifically, for example, as shown in FIG. 10, the protrusion dimension X4 of the rib 11 including the projection 111 = 2.
65 mm, protrusion size X5 of the rib 12 including the protrusion 121
Elongate body 32 having a protrusion dimension X6 of 2.55 mm = 2.55 mm and a protrusion 61 including the protrusion 131 and the rib 13.
(Left in the figure) is corrected to become a long body 32 (right in the figure) in which X7 = 2.50 ± 0.03 mm. As shown in FIG. 9, the size of the protrusions 11, 12, and 13 is such that the protrusion dimension H is 0.2 to 0.4 mm and the thickness W is 0.2 to 0.4.
mm.

When the long body 32 thus corrected is cut into a predetermined size to produce a large number of extruded profiles 6, each extruded profile 6
The projections of the protrusions 61 including the ribs 11, 12 and the ribs 13 from the plate body 10 are the same, and the projections are constant in the longitudinal direction of the ribs 11, 12 and 13. . In addition, the ribs 1 are mutually extruded.
The protrusions of the projections 61 including the ribs 1 and 12 and the ribs 13 from the plate body 10 are equivalent.

Therefore, when a heat sink is formed using such an extruded member 6, the following operation and effect can be obtained. That is, since the extruded profile 6 is finished to the expected dimensions, the heat sink itself is also finished to the expected dimensions, and has a stable rectangular parallelepiped shape. Therefore, the performance and quality are improved, and the problem of increased production cost is avoided.

The straight body 32 may be corrected by the press 5 as in the case of FIG.

[0020]

According to the first aspect of the present invention, since the protrusions of the corrected ribs have the same protrusion size in the ribs and are constant in the longitudinal direction of the ribs themselves, the heat sink has a stable rectangular parallelepiped shape. And thus performance and quality are improved.

According to the second aspect of the present invention, since the extruded profile can be finished to the expected dimensions, the heat sink itself can also be finished to the expected dimensions, and a stable rectangular parallelepiped can be obtained. Therefore, the performance and quality of the obtained heat sink can be improved, and the problem of increased production cost can be avoided.

[Brief description of the drawings]

FIG. 1 is a side view showing a heat sink manufactured by a method according to Embodiment 1 of the present invention.

FIG. 2 is a perspective view of a plate-like fin constituting the heat sink of FIG. 1;

FIG. 3 is a perspective partial view of a long body serving as a base of a plate-like fin.

FIG. 4 is a perspective view showing an example of a method for correcting a long body.

FIG. 5 is a side view showing a change in the elongated body of FIG. 3 due to correction.

FIG. 6 is a side sectional view showing another example of a method for correcting a long body.

FIG. 7 is a side view showing a heat sink manufactured by the method of Embodiment 2 of the present invention.

FIG. 8 is a perspective view of an extruded member constituting the heat sink of FIG. 7;

FIG. 9 is a partial perspective view of a long body serving as a base of an extruded shape member.

FIG. 10 is a side view showing a change in the elongated body of FIG. 9 due to correction.

FIG. 11 is a partially exploded side view of a conventional heat sink.

12 is a partial perspective view of a long body serving as a base of the plate-like fins constituting the heat sink of FIG. 11;

[Explanation of symbols]

 4 Roller 5 Press 10 Plate 11, 12, 13 Rib 31, 32 Long body 111, 121, 131 Projection

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H05K 7/20 B21D 53/04

Claims (2)

(57) [Claims] An extruded member having two or more ribs on the same side in the thickness direction of a plate body is superposed at equal intervals via a plurality of ribs to form a unitary heat sink. A protrusion having a thickness smaller than the thickness of the rib, and the protrusion is corrected so that the protrusion dimension of the rib from the plate body is uniform in the ribs and constant in the longitudinal direction of the rib itself. Features heat sink. 2. An extruded profile having two or more ribs on the same side in the thickness direction of the plate is extruded from a long body having the same shape as the extruded profile, and then cut into a predetermined size. Manufacturing
In a method for manufacturing a heat sink, comprising a step of superimposing a large number of the extruded members at regular intervals via ribs, when extruding the long body, an excess of a thickness smaller than the thickness of the rib is added to the tip of the rib. A step of forming the protrusions after the extrusion, and a step of correcting the protrusions of the protrusions by a roller or a press after the extrusion molding so that the protrusions of the ribs from the plate body are aligned with each other and constant in the longitudinal direction of the ribs. A method for manufacturing a heat sink, comprising: