JP3398337B2 - Joining method of heat exchanger components using ultrasonic combined vibration - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for joining components of a heat exchanger, such as cooling fins for cooling, which are provided in a heat generating portion of an electronic or electronic device, by welding.

[0002]

2. Description of the Related Art At present, a heat sink having a structure in which fins for cooling are arranged in rows is used at a heat generating portion in an electronic device. The heat sink is made of aluminum or its alloy (hereinafter referred to as aluminum) extruded. Since it is formed by molding, the fin cannot be molded to a thickness of 1 mm or less in terms of extrusion molding technology, and therefore, there is a problem that the cost of the heat sink is relatively high and resource is wasted. . This problem can be solved if a thin aluminum plate serving as a fin can be easily joined to an aluminum base plate, but the current aluminum welding technology has a higher cost than extrusion molding and is not in practical use.

[0003]

SUMMARY OF THE INVENTION In view of the problems of the current aluminum heat sinks as described above, the present invention provides an aluminum base plate and an aluminum fin formed separately from the aluminum base plate. Providing a low-cost and high-performance heat sink by joining by ultrasonic compound vibration,
Consequently, it is an object of the present invention to provide a method for joining a fin member and a base member made of aluminum, which constitutes various heat exchangers.

[0004]

The joining method of the present invention, which has been made for the purpose of solving the above-mentioned problems, has a base member for joining members constituting a heat exchanger such as a radiator or a radiator. The parts to be joined with the fin member are brought into surface contact with each other for positioning, and bending vibration and torsion are applied to the faces to be joined while applying an appropriate load in the vertical direction from the upper or lower part of the faces to be joined. Combine vibration
The surfaces to be joined are welded by simultaneously applying ultrasonic vibrations.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings. 1 is a front view schematically showing an embodiment of the method of the present invention, and FIG. 2 is a left side view of the embodiment of FIG.

In FIG. 1, reference numeral 1 is an aluminum base member, 2 is an aluminum fin member to be positioned and joined on the base member 1, and 3 is a joining surface 1a of the base member 1 facing upward. The support member 4 applied to the lower surface 1b side of the base member 1 is the upper surface 2a of the fin member 2.
The disc-shaped joining head 5 placed above is a round rod-shaped vibration transmission rod (vibration transducer) connected and connected to the center of the joining head, and has an angle of 45 °, a width of 0.5 m, and a length of 10 m. 18 diagonal slits are formed. 6 is an ultrasonic transducer in which the transmission rod 5 is coupled to the rear end, and 7 is an ultrasonic transducer joined to the transmission rod 5 via a horn 8 in a direction orthogonal to the transmission rod 5.
For example, Langevin type vibrators are used for the vibrators 6 and 7, respectively. An example of the ultrasonic compound vibration bonding apparatus for carrying out the method of the present invention is formed by the structure from the bonding head 4 to the vibrator 7 including the horn 8. The bonding head 4 is rotated and moved. Perform the joining work. Although F is a load applied from the bonding head 4 to the bonding surface, this load may be applied from the support member 3 side, or may be applied from both sides.

In carrying out the method of the present invention, first, the aluminum base member 1 is placed on the support member 3, and the fin member 2 is positioned and placed on the base member 1. Next, the bonding head 4 is applied to the upper surface 2a of the fin member 2, and as an example, the vibrators 6 and 7 are driven while applying a load F of about 3 to 5 kg per square millimeter, and bonding is performed via the horn 8. While applying the ultrasonic composite vibration generated in the head 4 to the surfaces 1a and 2b to be bonded, the bonding head 4 and the bonding surface 1a,
By moving the base member 1 and the fin member 2 relative to each other, the entire joint surfaces 1a and 2b of the base member 1 and the fin member 2 are melted, and the base member 1 and the fin member 2 are joined.

In the present invention, the ultrasonic composite vibration of the above example is transmitted to the disc-shaped bonding head 4 which is a vibration transmitting body acting as a bonding tool from the directions perpendicular to the transmission rod 5. It is generated by combining two vibrations into a composite vibration of bending vibration and torsional vibration in the disk-shaped joining head 4. This complex vibration can be generated by other vibration synthesis forms,
Whichever vibration combination method is used, by applying ultrasonic composite vibration to the joint surface between the base member 1 and the fin member 2, a favorable joining state of aluminum materials, which has been difficult or impossible to achieve in the past, is achieved. Can be achieved.

Incidentally, when aluminum materials are joined together by utilizing conventional single-mode ultrasonic vibration, the locus of vibration applied to the joining head 4 is linear (one-dimensional),
In many cases, there is a directional result in the joining, and the joining in the direction orthogonal to the vibration direction is not sufficient in many cases. In contrast to such a conventional technique, in the joining method of the present invention, the vibration locus of the joining head 4 is given a two-dimensional composite vibration such as an elliptical or circular shape instead of a unitary linear shape. Therefore, there is no directionality in the joining, and this makes it possible to realize a very good joining state between the aluminum materials.

It goes without saying that the joining method of the present invention can be applied not only to the above-mentioned aluminum materials but also to other metals. Further, in the present invention, as a method of making the vibration locus of the bonding head 4 into various two-dimensional modes, for example,
This can be performed by changing the frequency and phase difference of the vibration system for driving the vibrators 6, 7 and the horn 8. Especially when the vibrators 6 and 7 are driven at the same frequency,
If the phases are the same, the Lissajous figure draws a straight line,
By changing the phase by 90 degrees, it becomes circular, and it is possible to change the vibration locus variously to an ellipse or other shapes by different phase differences.

[0011]

The present invention is as described above, and when, for example, aluminum members constituting a heat exchanger such as a radiator or a radiator are joined together, the aluminum base member and the fin member are joined together. Position the part to be surface-contacted,
While applying an appropriate load from the upper or lower part of the part to be joined in a direction perpendicular to the plane thereof, by simultaneously applying ultrasonic vibration that is a combination of bending vibration and torsional vibration in the plane of the part to be joined, Since the surfaces of the portions to be joined are welded, it is possible to perform strong joining with high adhesion even with aluminum or its alloys, which was impossible with the conventional ultrasonic welding technology. In addition, even in the case of joining by ultrasonic vibration, since the composite vibration that does not cause directivity in joining is used, a joined portion having a uniform and large area can be obtained. Furthermore, in the ultrasonic composite vibration used in the method of the present invention,
The amplitude of ultrasonic vibration required for welding is less than half that of the conventional single-mode ultrasonic welding equipment, and the time required for welding is less than half due to compound vibration. It is possible to obtain a remarkable effect that cannot be obtained by joining with.

[Brief description of drawings]

FIG. 1 is a front view schematically showing one mode of carrying out the method of the present invention.

2 is a left side view of the embodiment of FIG.

[Explanation of symbols]

1 Base member 2 fin members 3 Support members 4 splicing head 5 transmission rod 6,7 Langevin type transducer 8 horns

─────────────────────────────────────────────────── --- Continuation of the front page (56) References JP-A-10-200022 (JP, A) JP-A-63-242479 (JP, A) JP-A-5-345356 (JP, A) JP-A-9- 253774 (JP, A) JP 6-29357 (JP, A) JP 56-99090 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) B23K 20/10 B29C 65 / 08

Claims (3)

(57) [Claims] 1. When joining members constituting a heat exchanger such as a radiator and a radiator, the base member and the fin member are brought into surface contact with each other and positioned so that the parts to be joined are positioned. While applying an appropriate load in the vertical direction from the upper or lower part to the plane, bending and vibration should be applied to the surfaces to be joined.
A method for joining heat exchanger constituent members using ultrasonic composite vibration, wherein the surfaces to be joined are welded by simultaneously applying ultrasonic vibrations that combine torsional vibrations. 2. The method for joining heat exchanger constituent members using ultrasonic composite vibration according to claim 1, wherein the base member and the fin member are made of aluminum or an alloy thereof. 3. The ultrasonic complex vibration, the bonding method of the heat exchanger components using ultrasonic complex vibration according to claim 1 or 2 is transmitted to the movable disc-shaped welding head rolling along the joint plane .