JP2000271765A - Joining method for heat exchanger constituting member using supersonic multiple vibration - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high performance heat sink at a low cost and to provide a method to join an aluminum base member and a fin member constituting various heat exchangers by joining an aluminum base plate and an aluminum fin formed separately from the plate with supersonic multiple vibration. SOLUTION: In joining members constituting a heat exchanger such as radiator, the sections to be joined between a base member 1 and a fin member 2 are face-abutted and positioned, while applying an appropriate load from the upper part or lower part of the faces to be joined in the vertical direction to the flat face, by simultaneously imparting the supersonic vibrations having different directions to the flat face to be joined, the faces to be joined are welded.

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 provided on a heat generating portion thereof, in an electronic or electronic device by welding.

[0002]

2. Description of the Related Art At present, a heat sink having a structure in which cooling fins are arranged at a heat generating portion in an electronic device or the like is used. This heat sink is formed by extruding aluminum or an alloy thereof (hereinafter referred to as aluminum). Since it is formed by molding, the thickness of the fin cannot be reduced to 1 mm or less due to the extrusion molding technique, so that there is a problem that the cost of the heat sink is relatively high and also that resources are wasted. . This problem can be solved if a thin aluminum plate serving as a fin can be easily joined to the aluminum base plate. However, the current aluminum welding technology is not practical because it costs more than extrusion molding.

[0003]

SUMMARY OF THE INVENTION In view of the above-mentioned problems of the current aluminum heat sink, the present invention relates to an aluminum base plate and an aluminum fin formed separately from the aluminum base plate. Providing a low-cost, high-performance heat sink by joining by ultrasonic composite vibration,
It is another object of the present invention to provide a method for joining an aluminum base member and a fin member constituting various heat exchangers.

[0004]

SUMMARY OF THE INVENTION The object of the present invention, which has been made to solve the above-mentioned problems, is to provide a base member which is used to join members constituting a heat exchanger such as a radiator or a radiator. And a fin member to be joined is positioned by abutting the surface, and while applying an appropriate load in a vertical direction to the plane from above or below the surface to be joined, the surface to be joined has a different orientation. The surface to be joined is welded by simultaneously applying sonic vibration.

[0005]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 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 denotes an aluminum base member, 2 denotes an aluminum fin member which is to be positioned on the base member 1 and joined thereto, and 3 denotes a joining surface 1a of the base member 1 facing upward. The support member 4 applied to the lower surface 1b of the base member 1 is an upper surface 2a of the fin member 2.
Disc-shaped welding head, 5 is a round bar-shaped vibration transmission rod (vibration transducer) connected and connected to the center of the welding head, and has an angle of 45 °, a width of 0.5 m, and a length of 10 m on the circumference. 18 diagonal slits are formed. Reference numeral 6 denotes an ultrasonic vibrator in which the transmission rod 5 is coupled to the rear end, 7 denotes an ultrasonic vibrator joined through a horn 8 in a direction perpendicular to the transmission rod 5,
As the vibrators 6 and 7, a Langevin type vibrator is used as an example. The configuration from the joining head 4 to the vibrator 7 having the horn 8 forms an example of an ultrasonic composite vibration joining apparatus for performing the method of the present invention. The joining head 4 is rotated and moved. The joining operation is performed while doing so. F is a load applied from the joining head 4 to the joining 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, an aluminum base member 1 is placed on a support member 3, and a fin member 2 is positioned and mounted on the base member 1. Next, the bonding head 4 is applied to the upper surface 2 a of the fin member 2, and the vibrators 6 and 7 are driven while applying a load F of about 3 to 5 kg per square millimeter as an example, and the bonding is performed via the horn 8. The head 4 and the joining surfaces 1a, 2b are applied while applying ultrasonic composite vibration generated in the head 4 to the surfaces 1a, 2b to be joined.
By relatively moving the base member 1 and the fin member 2, the entire surfaces of the 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 disk-shaped joining head 4 which is a vibration transmitting body acting as a bonding tool from the direction perpendicular to the transmitting rod 5. The two vibrations are generated by combining the two vibrations with the composite vibration of the bending vibration and the torsional vibration in the disc-shaped joining head 4. This complex vibration can be created by other forms of vibration synthesis,
In any of the vibration composite methods, by applying ultrasonic composite vibration to the joint surface between the base member 1 and the fin member 2, a favorable joint state between aluminum materials which has been difficult or impossible in the past. Can be achieved.

Incidentally, when aluminum materials are joined using conventional single-mode ultrasonic vibration, the locus of the vibration applied to the joining head 4 is linear (one-dimensional).
A directional result is produced in the joining, and the joining in the direction orthogonal to the vibration direction is often insufficient. In contrast to such a conventional technique, the joining method of the present invention provides a composite vibration in which the vibration trajectory of the joining head 4 is not a single linear shape but is two-dimensional, such as an elliptical or circular shape. Therefore, there is no directionality in the joining, and thereby an extremely good joining state between the aluminum materials can be realized.

The bonding method of the present invention can be applied not only to the above-mentioned aluminum materials but also to the bonding of other metals. Further, in the present invention, as a method of making the vibration trajectory of the joining head 4 into various two-dimensional modes, for example,
This can be performed by changing the frequency and phase difference of the vibrating system for driving the vibrators 6, 7 and the horn 8. In particular, when the vibrators 6 and 7 are driven at the same frequency,
If the phases are the same, the lizard figure draws a straight line,
By making the phases different by 90 degrees, a circular shape is obtained, and furthermore, the vibration trajectory can be variously changed to an elliptical shape or another shape by a different phase difference.

[0011]

The present invention is as described above, and constitutes a heat exchanger such as a radiator or a radiator. For example, when joining aluminum members, the joining between an aluminum base member and a fin member is performed. Position the part to be contacted with the surface,
By simultaneously applying ultrasonic vibrations of different directions in the plane of the part to be joined while appropriately applying a load from the upper or lower part of the part to be joined to the plane perpendicular to the plane, the part to be joined is Since the surfaces are welded, strong joining with high adhesion is possible even with aluminum or its alloys, which was impossible with conventional ultrasonic welding technology. In addition, even in the case of joining by ultrasonic vibration, a joint having a uniform and large area can be obtained because a composite vibration in which no directionality occurs in joining is used. Furthermore, in the ultrasonic composite vibration used in the method of the present invention, the amplitude of the ultrasonic vibration required for bonding is about half or less of the vibration of the conventional single mode ultrasonic bonding apparatus, and the time required for welding is also complex. It is possible to obtain a remarkable effect that can be obtained by the conventional joining by ultrasonic vibration, that is, half or less is required due to the vibration.

[Brief description of the drawings]

FIG. 1 is a front view schematically showing one embodiment of the method of the present invention.

FIG. 2 is a left side view of the embodiment of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base member 2 Fin member 3 Support member 4 Joining head 5 Transmission rod 6,7 Langevin type vibrator 8 Horn

Claims (4)

[Claims] When joining members constituting a heat exchanger such as a radiator or a radiator, a portion to be joined between a base member and a fin member is brought into surface contact with and positioned, and the surface to be joined is determined. An ultrasonic wave characterized in that the surfaces to be joined are welded by simultaneously applying ultrasonic vibrations in different directions to the surfaces to be joined while applying an appropriate load in the vertical direction to the plane from the upper or lower part. A method for joining components of a heat exchanger using complex vibration. 2. The method according to claim 1, wherein the base member and the fin member are made of aluminum or an alloy thereof. 3. The method of joining heat exchanger components using ultrasonic vibration according to claim 1 or 2, wherein the ultrasonic vibration applied to the bonding surface is an ultrasonic vibration combined with bending vibration and torsional vibration. . 4. A heat exchanger component using the ultrasonic composite vibration according to claim 1, wherein the ultrasonic composite vibration is transmitted to a disk-shaped welding head that can be rolled and moved along the joining surface. Joining method.