JPS6122238B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a heat sink for semiconductor devices such as transistors and thyristors.

Generally, this type of radiator is required to be lightweight and compact. However, since conventional heat sinks are manufactured from extruded aluminum, it is difficult to form thin fins, and therefore it is difficult to meet the demands for weight reduction and compactness.

The present invention has been made in view of the above points, and an object of the present invention is to provide a heat radiator that can be made lighter and more compact.

The manufacturing method of the radiator according to the present invention is to form a horizontal pipe part and one side thereof by extrusion molding, and cut out the lower part to a required width in the right half of the same shape material to form a rectangular right side remaining part. The upper and lower sides of the extruded aluminum molded material, which is made up of a plate part and a plate part forming the same, are cut to have an inclined length so as to form a left side remaining part of an inclined rectangle that slopes downward from the upper right to the lower left in the left half part. The left and right remaining portions are bent into a hairpin shape when viewed from above so that the left and right remaining portions face each other and their lower edges are on the same horizontal plane, and the working fluid is introduced into the tube. By enclosing it, the tube part becomes a heat pipe part, and the plate part becomes a heat dissipation fin part.

Hereinafter, the present invention will be specifically explained with reference to illustrated embodiments.

In this specification, vertical and horizontal relationships are based on FIG. 1.

In FIGS. 3 to 5, reference numeral 1 denotes a heat pipe part constituting the aluminum radiator according to the present invention, which has a hairpin shape when viewed from above.
The condensing side straight pipe section 1a is inclined upward in the distal direction with respect to the horizontal evaporation side straight pipe section 1b. Reference numeral 2 denotes a vertical thick plate-shaped heating element attachment part formed integrally with the outside of the heat pipe part 1 over its entire length, and a heating element H such as a transistor is attached to the evaporation side of this part. Reference numeral 3 denotes a thin plate-shaped lower heat dissipation fin portion integrally formed on the lower side of the mounting portion 2 over its entire length, and its outer surface is flush with the outer surface of the mounting portion 2. This has a small width on the evaporation side and runs along the straight pipe section 1b on the evaporation side, and on the condensation side, the width gradually increases from the bent part to the tip, and the upper side runs along the straight pipe section 1a on the condensation side. It is tilted like this. Reference numeral 4 denotes a thin plate-like upper heat dissipation fin portion which is formed integrally with the heating element mounting portion 2 over almost the entire length except for the tip on the condensing side, and its outer surface is also formed integrally with the heating element mounting portion 2 over almost the entire length thereof, except for the tip on the condensing side. It is flush with the outside. This has a large width on the evaporation side and runs along the evaporation side straight pipe section 1b, and on the condensation side, the width gradually decreases from the bent part to the tip, and the lower side runs along the condensation side straight pipe section 1a. It is slanted to follow. A paemite film for anticorrosion is formed on the surfaces of these fins 4 and 6.

Next, a method of manufacturing the above heat radiator will be explained.

First, by extrusion molding, as shown in Figs. 1 and 2, a horizontal pipe part 11, a thick plate part 12 provided on one side of this, and a pair of upper and lower parts provided on both upper and lower sides of this are formed. An extruded aluminum member 15 consisting of thin plate portions 13 and 14 is formed. Next, mold material 15
The lower thin plate part 14 is cut out to a required width from the lower end in the right half part of the right half part 16 to form a rectangular right remaining part 17 of the right half part 16.
form. Further, on the left half portion 18 of the profile 15, a left side remaining portion 19 having a width and length equal to the width and length of the right side remaining portion 17 and having an inclined rectangular shape that slopes downward from the upper right to the lower left of the left half portion 18 is provided. Cut the top and bottom sides in an oblique shape and remove. Next, the V-shaped bent plate consisting of the left and right remaining portions 17 and 19 formed in this way is bent so that the left and right remaining portions 17 and 19 face each other and their lower edges lie on the same horizontal plane, as shown in FIGS. 3 to 5. It bends into a hairpin shape. Finally, one end of the pipe section 11 is closed, and the other end is closed after degassing and injection of the working fluid. In this way, the tube part 11 is made into a heat pipe part, the thick plate part 12 is made into a heating element mounting part 2, and the thin plate parts 13 and 14 are made into heat radiation fin parts 3 and 4.
Nasu.

Note that a U-shaped tube may be connected to both ends of the hairpin-shaped tube portion 11 to form an elliptical loop tube, and this may be used as a heat pipe. The heat sink according to the invention can also be manufactured from roll-bonded material. That is, an anti-crimping agent is interposed between two rectangular aluminum plates in a dogleg pattern, these aluminum plates are pressed together to form a laminated plate having a dogleg-shaped non-crimped part, and this rectangular laminated plate is bent into a hairpin shape. The flat plate portions are made to face each other, the non-crimped portion is expanded to form an expanded tube portion, and finally, a working fluid is sealed in the expanded tube portion. In this way, a heat sink is manufactured.

Since this invention is configured as described above,
A compact and lightweight heatsink can be manufactured by simple operations such as cutting and bending the material. Furthermore, since the heat pipe section 1 has the condensing side straight pipe section 1a tilted upward in the distal direction with respect to the horizontal evaporating side straight pipe section 16, the recirculation of the condensed working fluid from the condensing section to the evaporating section is prevented. This is done smoothly and the heat transfer by the heat pipe is done efficiently. In addition, the heat pipe part 1 and the heat dissipation fin part 3,
4 are integrated, so the heat dissipation efficiency is extremely good.

[Brief explanation of the drawing]

The drawings show embodiments of the invention,
Figure 1 is a plan view of the extruded material, Figure 2 is a right side view of the same material, Figure 3 is a front view of the radiator, Figure 4 is a plan view of the radiator, and Figure 5 is the right side of the radiator. It is a diagram. 1... Heat pipe section, 1a... Condensing side straight pipe section, 1
b...Evaporation side straight pipe part, 2...Heating element mounting part, 3, 4
...Radiation fin, 11...Pipe part, 12...Thick plate part, 1
3, 14...Thin plate part, 15...Extruded molded material, 16...Right half part, 17...Right side remaining part, 18...Left half part, 19...Left side remaining part.

Claims (1)

[Claims] 1. Form an aluminum extruded material 15 consisting of a horizontal pipe portion 11 and plate portions 13 and 14 provided on one side of the horizontal tube portion 11 using an extruded material, and cut the lower side part to the required width with the right half 16 of the same material 15. At the same time, the upper and lower sides of the left half portion 18 are cut in an inclined shape so as to form a rectangular left side remaining portion 19 that slopes downward from the upper right to the lower left. left and right remaining parts 17,
The left and right remaining parts 17,
19 are bent in a hairpin shape when viewed from above so that the lower edges thereof face each other and lie on the same horizontal plane, and a working fluid is sealed in the tube portion 11 to form the tube portion 11 as a heat pipe portion. A method of manufacturing a heat radiator in which radiating fin parts 13 and 14 are made into radiating fin parts 3 and 4.