JPH10277671A - Method and device for joining extruded materials to each other - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten the dimension of a fin base joining part by rubbing small recessed/projecting parts with each other, then joining extruded materials to each other by a compound fastening force due to the galling/fitting in thereof. SOLUTION: By applying pressure to a flat part 2b of a fin part, the fin 2 and a base 3 are joined. A width of a projecting part 2a of the fin part 2 is roughly equal to a groove (d1) of the base 3, a width (w) between recessed parts is made equal to or smaller tan a width (w1) of a projecting part of the base 3. The width (d), for causing galling in force fitting in the fin 2, is preferably slightly larger than (d1). In this case, a length of the fin has impart on a press capacity in applying pressure. This is a construction for joining extruded material to each other, in which either one is a fin or a base of a heat sink or both are the base or the fin. By this method, a heat sink can be provided at the cost lower than a single body one.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention is mainly used in the field of industrial machines and electrics.

[0002]

2. Description of the Related Art Heat sinks made of aluminum or the like for cooling transistors, thyristors, etc. are usually manufactured from extruded materials. However, since the fins and the base are joined by brazing, there is a problem in cost. Further, in the heat sink in which the fin and the base are fastened by caulking or the like, the fin and the base are not adhered to each other, so that when both materials are different, there is a problem in heat conduction at the time of temperature change. In addition, the heat sink manufactured by using only the extruded material has a limitation in the extrusion technology, and the cooling capacity is not improved although the weight is increased.

[0003]

SUMMARY OF THE INVENTION The present invention utilizes the properties of metals such as aluminum to squeeze under pressure,
Not only does the purpose of manufacturing extruded materials combine with each other by instantly generating the processing effect and compressive stress to produce a high-performance heat sink with good thermal conductivity, but it is also lighter and higher than the heat sink manufactured by extruded material alone. An object of the present invention is to manufacture and provide a high-performance and inexpensive heat sink.

[0004]

SUMMARY OF THE INVENTION The present invention provides a method for joining
A plurality of convex portions provided with a plurality of small uneven portions on the surface are provided on the joining surface of one extruded material of the two independent extruded materials, and the convex surfaces are provided on the joining surface of the other extruded material. A small uneven portion corresponding to the small uneven portion configured in the convex portion is also provided on the surface of the concave portion to be formed,
When the convex portion is press-fitted into the concave portion, the small concave and convex portions provided in the concave portion and the convex portion rub against each other, and the galling that occurs from shaving the surface and the elongation that occurs during the press-fitting. A method of joining extruded materials, characterized in that extruded materials are joined by a combined fastening force that causes the resulting processing effect, stress caused by press-fitting, and the small uneven portion to fit into each other.

According to the present invention, a plurality of convex portions provided with a plurality of small uneven portions on the surface are provided on a joining surface of one of two independent extruded materials to be joined, and the other extruded material is provided on the other extruded material. A small uneven portion corresponding to the small uneven portion configured in the convex portion is also provided on the surface of the concave portion corresponding to the convex portion on the joining surface of the material, and the convex portion is At the time of press-fitting into the concave portion, the small uneven portions provided on the concave portion and the convex portion rub against each other, and the galling caused by shaving the surface and the processing effect caused by the elongation occurring at the time of press-fitting and the small size. A method of joining extruded materials, characterized in that the extruded materials are joined by a composite fastening force in which the concave and convex portions are fitted to each other, and one of the extruded materials is a fin or a base of a heat sink, or both are bases or fins. A coupling structure of a extrusion comrades.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention is mainly used as a heat sink for cooling a power section in the field of industrial electricity.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a heat sink to which the present invention is applied. Fin 2 as shown in FIG.
And base 3 for mounting heating elements such as transistors
The protrusions 2a made of the extruded material and formed on the fin 2 are press-fitted into grooves 3a provided on the base.

FIG. 3 is a partially enlarged view of the connecting portion after the connection. FIG. 4 is a partial view of the connection portion before connection, in which pressure is applied to the flat portion 2b of the fin portion to connect the fin and the base. Here, the width d of the convex portion 2a of the fin portion is substantially the same as the groove d1 of the corresponding base, and the concave portion w is made the same or slightly smaller than the convex portion w1 of the corresponding base. In order to cause galling when press-fitting the fins, it is better that d is slightly larger than d1,
In this case, since the length of the fin affects the applied pressure, this value depends on the pressing ability to apply the pressure.

As shown in the enlarged view of the small uneven portion in FIG. 5, the convex portion of the fin is formed with small uneven portions having a height h pitch p, and the corresponding concave portion of the base is formed. Similarly, a small uneven portion having a height h and a pitch p is formed.

When the convex portions of the fins are pressed into the corresponding concave portions of the base by pressure, the small uneven portions 2c and 3c having a pitch P and a height h provided on the fins and the base are rubbed against each other. Are instantaneously peeled off, and the new surfaces of the concave and convex portions are pressed against each other due to the stress generated at the time of press-fitting, and galling occurs. At this time, if a stable new surface cannot be formed due to the tolerance, the small concave and convex portions provided on the concave portion and the convex portion can be fitted to each other to secure the connection. Can maintain the binding force.

Further, since the concave portion w of the fin is slightly smaller than the convex portion w1 of the base, the portion 2b shown in FIG. 4 is stretched at the time of press-fitting to cause a processing effect, and this connection is ensured.

[0012]

According to the present invention, by providing the fins and the base with small uneven portions, the dimensions of the fin base connection portion can be shortened, so that the base plate thickness can be suppressed, and the weight of the extruded material alone increases. The price of the heat sink, which increases the price, can be provided at a higher performance and at a lower price than when the heat sink is manufactured alone. Further, according to the present invention, since the fin and the base are connected by galling, the heat conductivity is good.

[0013]

[Brief description of the drawings]

FIG. 1 is a perspective view of a heat sink.

FIG. 2 Before heat sink assembly

FIG. 3 is an enlarged view of a heat sink fitting portion.

[Fig. 4] Diagram before fitting of fin and base

FIG. 5 is an enlarged view of a fin convex portion and a base concave portion.

FIG. 6 is a partially enlarged view after the fin and the base are combined.

(A) Plan view of the heat sink (b) Front view of the heat sink (c) Side view of the heat sink (d) Left side view of the heat sink (e) Right side view of the heat sink

[Explanation of symbols]

FIG. 1 1 heat sink 2 fin portion 3 base portion

FIG. 2 2 Fin portion 2a Fin convex portion 3 Base portion 3a Base concave portion

FIG. 3 shows 2 fin portions 2a fin convex portions 3 base portion

FIG. 4: 2 fin portions 2a fin convex portions 2b fin flat portions 3 base portion 3a base concave portions

FIG. 5: 2 fin portion 2a fin convex portion 2c fin small uneven portion 3 base portion 3a base concave portion 3c base small uneven portion h small uneven portion height p small uneven portion pitch

FIG. 6: 2 fin portions 3 base portion

FIG. 7: 2 fin portions 3 base portion

Claims (2)

[Claims] An extruded member having one of two independent extruded members to be joined is provided with a plurality of convex portions provided with a plurality of small uneven portions on a surface on a joining surface of one of the extruded members. On the surface of the concave portion corresponding to the convex portion on the joining surface, a small concave / convex portion corresponding to the small concave / convex portion formed in the convex portion is provided, and the convex portion is formed by the concave portion. During press-fitting, the small uneven portions provided on the concave and convex portions rub against each other, causing galling caused by shaving the surface and the processing effect resulting from elongation occurring during press-fitting and stress generated by press-fitting. Wherein the extruded materials are joined to each other by a composite fastening force in which the small uneven portions are fitted to each other. 2. The combination of extruded materials as claimed in claim 1, wherein either one is a fin or a base of a heat sink or both are bases or fins.