JPH0577071A - Method and apparatus for joining metallic foils - Google Patents

Abstract

PURPOSE:To surely join metallic foils by pressing lapped metallic foils from a side irradiated with a beam, adhering them locally and irradiating them with a high density energy beam. CONSTITUTION:In a lap welding of plural metallic foils 5, the circumference of an irradiation schedule point of high density energy beam 8 of lapped metallic foils 5 is pressed by a pressing nozzle 10 from the irradiation side of the beam 8 at the neighborhood of the irradiation schedule point to be irradiated with high density energy beam as the metallic foils are adhered locally at a small area containing an irradiation schedule point. In this way, the metallic foils can be tight-adhered and welded surely even in case of a three dimensional structure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for joining metal foils.

[0002]

2. Description of the Related Art In recent years, metal foil having a thickness of about 100 .mu.m or several tens of .mu.m has come to be obtained with the progress of the rolling technique of a thin metal plate. In various applications,
When stacking a plurality of metal foils and joining them by welding, welding with a high-density energy beam such as a laser beam is performed. At that time, if the metal foils are simply overlapped with each other, the weld bead width will not be constant, only the upper one will melt, or local heating will occur, causing the molten part to fall off, resulting in sound welding. There was a problem that could not be done.

In order to solve the above problems, Japanese Patent Laid-Open No. 1-
No. 306085, a method of bringing metal foils into close contact with each other by sandwiching both sides of a planned joining portion of superposed metal foils with a jig such as a bolting type and applying a tensile force to the metal foils. Is disclosed. However, the above-mentioned method has a drawback that it takes a lot of time and labor to change the setup when there are many welding points, and the weld seam shape is limited to a straight line. A further major drawback is that when a flat plate and a corrugated plate are superposed and joined together to form, for example, a honeycomb-shaped product, the corrugated plate is crushed at the portion sandwiched by the jig, and the corrugated plate itself extends due to tensile force. Therefore, there is a problem that the above method cannot be applied.

[0004]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, and not only securely adheres metal foils to each other at a site to be joined, but also does not require complicated setup change and has a welded seam shape. It is an object of the present invention to provide a metal foil bonding method and a metal foil bonding method, which are not limited and can be applied to the formation of a two-dimensional or three-dimensional structure such as a honeycomb using a corrugated plate or the like.

[0005]

In order to achieve the above-mentioned object, a method for joining metal foils of the present invention is such that a plurality of metal foils are superposed and a surface of the uppermost metal foil is irradiated with a high-density energy beam. In the method for joining metal foils by seam welding the metal foils together, in the vicinity of the high-density energy beam irradiation planned point of the superposed metal foils, by pressing from the beam irradiation side in the immediate vicinity of the irradiation planned point, It is characterized in that the metal foils are locally brought into close contact with each other in a small region including a planned irradiation point and the high-density energy beam irradiation is performed.

Further, the metal foil joining apparatus for carrying out the method of the present invention is constructed by stacking a plurality of metal foils and irradiating the uppermost metal foil surface with a high-density energy beam so that the metal foils are bonded to each other. In a seam-welding apparatus for joining metal foils, the irradiation target points are arranged around the irradiation target points so that the metal foils are brought into close contact with each other in a small area including the high density energy beam irradiation target points of the superposed metal foils. It is characterized in that it is provided with means for pressing the beam irradiation side most recently.

[0007]

According to the present invention, the periphery of the high-density energy beam irradiation planned point is pressed in the immediate vicinity of the irradiation planned point, and the metal foils are locally brought into close contact with each other at the pressing portion to perform the beam irradiation, so that the bonding site Can be firmly adhered to perform welding reliably. In addition, since the pressing to bring the metal foils into close contact with each other at the planned joining site is performed from the high-density energy beam irradiation side, by combining with various auxiliary equipment, the shape of the welding seam is not limited to a straight line, but a curved line or a polygonal line. Welding seams of a wide variety of shapes such as shapes can be used as needed, and metal foil having a three-dimensional shape such as a corrugated sheet is used to form a two-dimensional or three-dimensional structure like a honeycomb. It can be sufficiently applied to the formation of a structure.

Hereinafter, the present invention will be described in more detail by way of examples with reference to the accompanying drawings.

[0009]

【Example】

[Embodiment 1] FIG. 1 shows an arrangement example in which metal foils are joined by using the apparatus according to the present invention. According to the present invention, a pressing nozzle 10 for pressing a predetermined joining portion of a metal foil includes a sleeve 1 through which a laser beam 8 penetrates, a pressing head 2 for directly contacting and pressing the metal foil, and a pressing for the sleeve 1. A spring 3 for elastically holding the head 2 and a pin 4 inserted into a key groove 2a on the side surface of the pressing head 2 through a hole (not shown) on the side surface of the sleeve 1. A screw 1 for attaching to an irradiation nozzle attachment portion 6 of a laser beam generator (not shown) is provided on the outer periphery of the upper portion of the sleeve 1.
a is cut off.

The procedure for assembling the pressure nozzle 10 is as follows. The spring 3 is first inserted from the lower end (laser beam emitting side) of the sleeve 1, and then the pressing head 2 is inserted. When the pressing head 2 is pushed in, the upper end of the spring 3 comes into contact with the shoulder 1b at the upper part of the sleeve 1 (below the screw 1a). When the spring 3 is further pushed in to compress the spring 3 and the key groove 2a on the side surface of the pressing head 2 and the hole (not shown) on the side surface of the sleeve 1 are aligned with each other, a pin is inserted from the outside to the key groove 2a through the hole. As a result, the pressing head 2 has the tip portion 2
In the state where b is projected downward from the lower edge of the sleeve 1 and is pressed downward by the spring 3, the key groove 2a
The upper end of is hooked on the pin 4 and held. Pressing head 2
Is a key groove 2a when a pressure (pressing force) that overcomes the repulsive force of the spring 3 at the current position is applied to the pressing surface 2c.
It is possible to move along the direction of the beam 8 (arrows A and B in the drawing) within the range of the distance defined by the length L of.

The pressure nozzle 10 assembled as described above.
(1, 2, 3, 4) are attached and fixed to the irradiation nozzle attachment portion 6 of the laser beam generator (not shown) with the screw 1a on the upper portion of the sleeve 1, and welding is performed. Laser beam 8
Is radiated from the irradiation nozzle mounting portion 6 through the inside of the sleeve 1 of the pressing nozzle 10 and from the irradiation opening 2d at the tip of the pressing head 2 to the surface of the uppermost foil of the metal foils 5 superposed on each other.

The method of mounting the pressure nozzle 10 is as follows.
A method other than the above may be used depending on the shape of the irradiation nozzle mounting portion 6 of each laser generator. The focus of the laser beam is adjusted so as to correspond to the position where the pressing head 2 is pushed up in the direction A to some extent. Then, when welding is performed, the necessary pressing is started when the focal point of the laser beam 8 is focused on the surface of the uppermost metal foil 5. The pressing force is adjusted to an appropriate magnitude by changing the strength of the spring 3 to be used according to the material, thickness, and cross-sectional shape (waveform, etc.) of the metal foil to be joined. For this purpose, the spring 3 can be replaced easily by removing the pin 4 in accordance with the above-mentioned assembly procedure, and therefore no complicated setup replacement is required.

When the laser beam is focused, the repulsive force of the spring 3 in the compressed state causes the pressing surface 2 of the pressing head 2 to move.
At c, the uppermost surface of the metal foil 5 is loaded as a pressing force. As a result, the two metal foils 5 have laser beam irradiation planned points 5a.
It is pressed in the immediate vicinity of the planned irradiation point 5a with which the pressing surface 2c is in contact with, and locally adheres in a small area including the planned irradiation point 5a. By moving the pressing nozzle 10 on the surface of the metal foil while irradiating the laser beam in this state, it is possible to bring the planned joining portions into close contact with each other and perform seam welding.

Furthermore, welding with a seam shape other than a straight line and a two-dimensional or three-dimensional shape of metal foil, which is impossible with the conventional method in which the metal foil is restrained by a jig and a tensile force is applied, are used. Also applicable to structures. Some examples will be described below. [Embodiment 2] In FIG. 2, a corrugated metal foil 5B is superposed on a flat metal foil 5A according to the present invention to form a honeycomb-shaped structure 2
An example of forming 0 will be shown.

In this case, by adjusting the pressing force so that the corrugated sheet metal foil 5B is not crushed, the corrugated sheet metal foil 5B can be welded without being deformed. [Embodiment 3] FIG. 3 shows an example in which two flat sheet metal foils 5 are welded and joined together by a curved seam 30 or a bent line seam 31 according to the present invention.

In this case, two flat sheet metal foils 5 are superposed on each other on an X-Y axis numerical control table (not shown) and welded by the pressing nozzle 10 of the present invention, so that a complicated shape other than a straight line is obtained as shown in the figure. It is possible to perform welding with a welding seam along various paths. [Embodiment 4] As shown in FIG. 4, by mounting the pressing nozzle 10 on an appropriate welding robot (not shown), it is possible to perform three-dimensional welding while winding the honeycomb 40.

The present invention is applied to a wide variety of foil shapes and welded structures as shown in Examples 2 to 4 by adopting a method of pressing metal foils from the laser beam irradiation side to bring them into close contact with each other. It has extremely high flexibility. In Examples 1 to 4 described above, the example in which the pressing force for bringing the metal foils into close contact with each other is applied by the elastic force of the spring 3 has been described, but the pressing force applying means need not be limited to the spring and can be applied to the metal foils. Any means capable of elastically applying a pressing force may be used. Such an example is shown below. [Embodiment 5] The sleeve 1, the pressing head 2, and the pin 4 are the same as those in Embodiment 1, but an air cylinder 7 is provided on the outer circumference of the sleeve 1 as a pressing force applying means instead of the spring 3.

Air supply ports 7a are provided at the upper and lower portions, respectively.
Also, the air cylinder 7 having the air discharge port 7b is fixed to the outer peripheral surface of the sleeve 1 by a holding member 9, and the piston shaft 7c extending below the air cylinder 7 is held on the outer peripheral surface of the pressing head 2. It is fixed to the member 2e with a nut 7d. According to this aspect, since the pressing force can be adjusted at any time by adjusting the supply air pressure, it is not necessary to replace the spring 3 as in the first embodiment, and the shape and size of the metal foil to be joined and the welded structure can be adjusted. The required pressing force can be changed and adjusted more easily.

[0019]

As described above, according to the present invention,
No complicated setup change is required, the weld seam shape is not limited, and not only for joining flat plates but also for forming a two-dimensional or three-dimensional structure such as a honeycomb using corrugated plates. , The metal foils can be reliably brought into close contact with each other at the planned joining portion and seam welding can be performed.

[Brief description of drawings]

FIG. 1 is a partial cutaway view showing an example of an apparatus for performing metal foil bonding according to the present invention and an arrangement example of objects to be bonded.

FIG. 2 is a perspective view showing a state in which a flat metal foil and a corrugated metal foil are bonded together to form a honeycomb structure according to the present invention.

FIG. 3 is a perspective view showing a state in which metal foils are joined with curved and polygonal seams according to the present invention.

FIG. 4 is a front view showing a state of seam welding while winding a honeycomb according to the present invention.

FIG. 5 is a partial cutaway view showing another example of an apparatus for performing metal foil bonding according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Sleeve 2 ... Pressing head 3 ... Spring 4 ... Pin 5 ... Metal foil 6 ... Irradiation nozzle attachment part 7 ... Air cylinder 8 ... Laser beam 9 ... Holding member 10 ... Pressing nozzle 20 ... Honeycomb 30 ... Curved welding seam 31 ... Polyline weld seam 40 ... Honeycomb

Claims (8)

[Claims] 1. A method for joining metal foils, comprising laminating a plurality of metal foils, and seam-welding the metal foils together by irradiating the surface of the uppermost metal foils with a high-density energy beam. By pressing the periphery of the high-density energy beam irradiation planned point from the beam irradiation side in the immediate vicinity of the irradiation planned point, the metal foils are locally brought into close contact with each other in a small area including the irradiation planned point, A method for joining metal foils, characterized in that the high-density energy beam irradiation is performed. 2. A pressing head, which is elastically movable within a predetermined range along the beam direction at a beam exit of a pressing nozzle through which a high-density energy beam penetrates, is provided on the uppermost metal foil surface. The method for joining metal foils according to claim 1, wherein the metal foils are pressed against each other, and the pressing is performed by the elasticity. 3. The elastic force for pressing is applied by a spring, and the necessary pressing force according to the metal foil to be joined is set by selecting the spring.
A method for joining the described metal foils. 4. The elastic force for pressing is applied by an air cylinder, and the necessary pressing force according to the metal foil to be joined is set at any time by the air pressure supplied to the air cylinder. The method for joining metal foils according to claim 2. 5. A metal foil joining apparatus for laminating a plurality of metal foils, and seam-welding the metal foils by irradiating the surface of the uppermost metal foil with a high-density energy beam. A means for pressing the periphery of the planned irradiation point from the beam irradiation side in the immediate vicinity of the planned irradiation point so that the metal foils are brought into close contact with each other in a small area including the planned point for irradiation of the high-density energy beam. A device for joining metal foils. 6. A pressing head is provided at a beam exit of a pressing nozzle through which a high-density energy beam penetrates, and a pressing head is provided so as to be elastically movable within a predetermined range along the beam direction. The metal foil joining apparatus according to claim 4, which is characterized in that. 7. A spring having a resilient force for pressing the spring, and setting the necessary pressing force according to the metal foil to be joined is performed by selecting the spring. Item 2. A method for joining metal foils according to item 2. 8. An air cylinder for imparting elasticity for pressing is provided, and a necessary pressing force according to the metal foil to be joined is set at any time by the air pressure supplied to the air cylinder. The method for joining metal foils according to claim 2, wherein: