JPH0435272B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for welding a metal honeycomb carrier used in a catalytic converter.

[Conventional technology]

Generally, a metal honeycomb carrier such as that disclosed in Japanese Patent Application Laid-Open No. 13462/1984 is disposed in the exhaust system of an automobile in order to purify exhaust gas.

FIG. 5 shows details of this type of metal honeycomb carrier. This metal honeycomb carrier consists of corrugated metal plates 11 and flat plates 13 stacked alternately, and these are arranged in a circular shape with the core material at the center. The core portion 17 is formed by multiple winding in a shape.

In such a core part 17, the corrugated plate 11 and the flat plate 1
3 remains wound, the corrugated plate 11 and flat plate 13 located at the center of the core part 17 will protrude in the axial direction of the core part 17 due to the flow of exhaust gas into the core part 17. To avoid this, the so-called film-out phenomenon occurs, so after the core portion 17 is formed, the corrugated plates 11 and the flat plates 13 are alternately welded.

FIG. 6 shows an example of a conventional welding method for a metal honeycomb carrier.
7 with the end surface 19 facing upward, a laser beam 23 is irradiated toward the end surface 19 from the welding head 21 disposed above this end surface 19, and the welding head 21 is moved in the radial direction of the core portion 17. As a result, the part of the corrugated plate 1 irradiated with the laser beam 23
1 and the flat plate 13 are welded at the end face 19.

[Problem that the invention seeks to solve]

However, in such a conventional metal honeycomb carrier welding method, when welding by focusing the laser beam 23 on the end face 19 position of the core part 17, the laser beam 23 at the end face 19 position is
3 is a small diameter of about 0.2 mm, for example, in order to weld a width of 2 mm, it is necessary to move the welding head 21 back and forth 5 times, which poses a problem that welding takes a lot of time. .

Therefore, it is conceivable to position the end surface 19 of the core portion 17 closer to the welding head 21 than the focal position of the laser beam 23 and weld at a position where the diameter of the laser beam 23 is relatively large, but in this case,
Since there is a large difference in power density between the central part and the peripheral part of the laser beam 23, there is a problem in that it is difficult to perform welding at a uniform level.

[Purpose of the invention]

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a welding method for a metal honeycomb carrier that can quickly and reliably weld a corrugated plate and a flat plate to each other. .

[Means for solving problems]

The welding method for a metal honeycomb carrier according to the present invention involves stacking a metal corrugated plate and a flat plate, and applying a laser beam oscillated from a laser oscillator to the end face of a core portion formed by multiple winding of these metal plates. irradiate,
In the metal honeycomb carrier welding method for welding the corrugated plate and the flat plate to each other, the laser beam is converted into a linear beam by a condensing member and then irradiated onto the end face of the core portion.

[Action of the invention]

In the method for welding a metal honeycomb carrier of the present invention, a laser beam is converted into a linear beam by a condensing member, and then is irradiated onto the end face of the core portion.

Therefore, by setting the axis of the linear beam in a direction that is inclined or perpendicular to the direction in which the laser beam moves, the welding width can be widened, and the corrugated plate and the flat plate can be welded together quickly and reliably. It becomes possible to perform welding.

[Embodiments of the invention]

Hereinafter, details of the method of the present invention will be described with reference to the drawings and examples thereof.

FIG. 1 shows a metal honeycomb carrier welding device for carrying out an embodiment of the method of the present invention. A core portion formed by multiple windings is shown.

This core part 31 is arranged with an end surface 37 facing upward, and above the end surface 37, a light condensing member 3
9 is placed.

A laser beam 43 from a laser oscillator 41 is guided to this condensing member 39 via a condensing lens 45 .

The condensing member 39 and the condensing lens 45 are housed in a welding head 47.
is movable in the direction of arrow A in the figure.

Therefore, in this embodiment, the light condensing member 39 is
As shown in FIG. 2, the condenser member 39 is made of a cylindrical concave mirror, and reflects the cylindrical laser beam 43 from the condenser lens 45 at an angle of 90°, and converts the laser beam 43 into a linear beam. 49.

The condensing member 39 is attached to the welding head 47 so that the axis 51 of the cross section of the linear beam 49 is perpendicular to the moving direction A of the welding head 47.
It is located in

In the metal honeycomb carrier welding apparatus configured as above, the laser beam 43 emitted from the laser oscillator 41 is focused by the condenser lens 45, guided to the condenser member 39, and then connected to the condenser member 39. 39
, and at the same time it becomes a linear beam 49,
The end face 37 of the core portion 31 is irradiated. Furthermore, when the welding head 47 oscillates the laser beam 43,
It is moved at a constant speed in the direction of arrow A in the figure.

Therefore, in the method of the present invention, after the laser beam 43 is converted into a linear beam 49 by the condensing member 39, the end face 37 of the core portion 31 is irradiated, so that the axis 51 of the linear beam 49 is By setting the direction perpendicular to the moving direction A, the welding width can be made much wider than before, and the corrugated plate 33 and the flat plate 35 can be welded together quickly and reliably. .

Since the linear beam 49 made into a linear shape by the condensing member 39 has a very small difference in power density between the central part and the peripheral part, it is possible to perform welding at a uniform level.

That is, in the method of the present invention, even if the diameter of the laser beam 43 focused by the focusing lens 45 is as small as, for example, 0.2 mm, substantially
Welding can be performed with a width corresponding to the length of the axis 51 of the linear beam 49, and the corrugated plate 33 and the flat plate 35 can be welded quickly and reliably.

In addition, in the embodiment described above, the cylindrical core portion 3
The method of the present invention has been explained in Section 1, but when applying the method of the present invention to an elliptical core portion 53 as shown in FIG. By moving the welding head 47 parallel to the welding direction, more uniform welding can be achieved.

That is, as shown by the symbol C in the figure, the flat plate 55
When welding from a direction perpendicular to the direction of
Since there is a state in which the linear beam 49 is located only on the corrugated plate 57 or the flat plate 55, it is larger than the corrugated plate 57 due to the penetration of the flat plate 55, but the flat plate 5
When welding is performed in parallel to the direction 5, the linear beam 49 always straddles the corrugated plate 57 and the flat plate 55, so that uniform penetration can be achieved.

FIG. 4 shows another light condensing member used in the method of the present invention. This light condensing member 59 is made of a cylindrical convex lens, and allows the laser beam 43 to pass through it, thereby directing the laser beam 43 into a line. It can be made into a shaped beam 49.

In addition, in the embodiment described above, the laser oscillator 4
1 and the condensing member 39, the method of the present invention is not limited to such an embodiment, and the method of the present invention is not limited to such an embodiment.
Of course, a condensing lens 45 may be disposed between the core portion 31 and the core portion 31 .

Further, in the embodiment described above, the linear beam 49
Although an example has been described in which the axis 51 of the linear beam 49 is set in a direction perpendicular to the direction of movement of the welding head 47, the method of the present invention is not limited to such an embodiment, and the axis 51 of the linear beam 49 is Welding head 4
Needless to say, it is sufficient that the position is inclined with respect to the direction of movement of 7.

〔Effect of the invention〕

As described above, in the method for welding a metal honeycomb carrier of the present invention, the laser beam is made into a linear beam by a condensing member and then irradiated onto the end face of the core portion, so that the corrugated plate can be welded quickly and reliably. It has the advantage that mutual welding with flat plates can be carried out.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an example of a metal honeycomb carrier welding apparatus for carrying out the method of the present invention, and FIG.
Figure 3 is an explanatory diagram showing a light condensing member, Figure 3 is an explanatory diagram showing an elliptical core part, Figure 4 is an explanatory diagram showing another light condensing member, and Figure 5 is an explanatory diagram showing a corrugated plate and a flat plate. FIG. 6 is a perspective view showing a conventional welding method for a metal honeycomb carrier. 31, 53... core part, 33, 57... corrugated plate,
35, 55... flat plate, 37... end face, 39... condensing member, 43... laser beam, 49... linear beam.

Claims (1)

[Scope of Claims] 1. A laser beam emitted from a laser oscillator is irradiated onto the end surface of a core portion formed by stacking a metal corrugated plate and a flat plate and winding them multiple times,
In the metal honeycomb carrier welding method of welding the corrugated plate and the flat plate to each other, the metal honeycomb carrier is characterized in that the laser beam is made into a linear beam by a condensing member and then irradiated onto the end face of the core portion. welding method. 2. The method for welding a metal honeycomb carrier according to claim 1, wherein the condensing member is a cylindrical concave mirror. 3. The method for welding a metal honeycomb carrier according to claim 1, wherein the light condensing member is a cylindrical convex lens.