JPH07308584A - Metallic carrier - Google Patents

Abstract

PURPOSE:To obtain a metallic carrier excellent in ability to prevent disconnection between both elements of a metallic honeycomb body and a metal-made casing and excellent in durability in the center part (axial direction and radial direction) and economy by fixing both structural elements of the metallic honeycomb body and the metal-made casing to each other from the outside of the metal-made casing by the beam welding method. CONSTITUTION:This metallic carrier is composed of the metallic honeycomb body XH for carrying an exhaust gas purifying catalyst and the metal-made casing C for housing the metallic honeycomb body XH. The metallic honeycomb body XH has a structure formed by using at least three stacks formed by laminating alternately a thin metallic plate-made planar belt-like material and a corrugated belt-like material in a desired number of stages, allowing each stack to be in contact with each other at the contact end part of one end and winding around the contact end part in the same direction so as to allow the planar belt-like material and the corrugated belt-like material of each stack to be in contact with the inside wall surface of the wrapping metal-made casing C. Both structural elements of the metallic honeycomb body XH and the metal-made casing C are fixed from the outside of the casing C by beam welding with a laser beam welder L.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention generally relates to a honeycomb structure made of metal (hereinafter referred to as metal) for carrying an exhaust gas purifying catalyst which is used as an exhaust gas purifying means for automobiles by being inserted in an exhaust system. A honeycomb body), and a metal casing (hereinafter, referred to as a metal casing) that encloses the metal honeycomb body.
Also called a metal casing. ) As a main component.

More specifically, the present invention relates to an X for carrying an exhaust gas purifying catalyst, particularly as a metal honeycomb body.
-A lap-type metal honeycomb body is used as a main constituent element, and a beam welding method is applied to fix the metal honeycomb body to the metal casing in relation to the metal honeycomb body to prevent the separation (desorption) of both constituent elements. It is an object of the present invention to provide a metal carrier which is excellent in durability of the central portion, which is a major problem in this type of X-wrap type metal honeycomb body, and which is more economical than the brazing method.

[0003]

2. Description of the Related Art Conventionally, in a vehicle exhaust gas purifying apparatus of this type, a ceramic monolith type carrier has been used as a honeycomb structure carrier for carrying an exhaust gas purifying catalyst (Pt, Pd, Rh, etc.). Instead, the metal monolith type is attracting attention. In general,
Metal monolithic metal carrier (MS, metal substrate) for supporting a catalyst for exhaust gas purification
Is a stack of heat-resistant thin steel plate flat strips and corrugated strips that come into contact with each other, and are spirally formed in a batch to form an exhaust gas passage in the axial direction. Of a winding type metal honeycomb body having a large number of mesh-like ventilation holes (cells), and a tubular metal casing having both ends opened for fitting and fixing the honeycomb body inside. It is something. By the roll forming of the flat plate-shaped strip material and the corrugated plate-shaped strip material, a large number of mesh-like ventilation passages (cells) serving as exhaust gas flow passages are automatically formed.

In the above-mentioned conventional metal carrier composed of a wound type metal honeycomb body and a metal casing, the wound type metal honeycomb body and the metal casing are heated to a high temperature of the exhaust gas itself and the exhaust gas. Firmly fixed by brazing or welding so as to withstand the thermal expansion and thermal stress that occur in a high temperature atmosphere due to the exothermic reaction with the exhaust gas purification catalyst, and also to withstand the severe vibration when driving a car. To be done. Further, it goes without saying that the abutting portions of the flat plate-shaped band member and the corrugated plate-shaped band member forming the metal honeycomb body are also fixed by various methods such as brazing and welding.

Although the wound-type metal honeycomb body constituting the above-mentioned metal carrier is superior to the ceramic monolith-type one in various respects, it has a large thermal stress generated under the severe thermal conditions. On the other hand, there is still room for improvement. Particularly, since excessive thermal stress concentrates and accumulates on the outer peripheral portion of the metal honeycomb body that abuts on the inner wall surface of the metal casing and a portion in the vicinity thereof, a flat plate-shaped strip material or a corrugated plate-shaped strip material forming the metal honeycomb body is formed. Buckles, breaks or cracks, and reduces durability.
This is because the outer peripheral portion of the metal honeycomb body that comes into contact with the inner wall surface of the metal casing is composed of a set of flat plate-shaped strips and corrugated plate-shaped strips, and the set of strips is inside the metal casing. This is because they are in contact with each other along the wall surface, that is, they are joined in a planar manner, and the thermal stress generated inside the metal honeycomb body cannot be sufficiently absorbed and relaxed.

Recently, in place of the above-mentioned spiral-wound type metal honeycomb body, a minimum constituent unit constituting the metal honeycomb body, that is, a pair of flat plate-shaped strip material and corrugated plate-shaped strip material in abutting relationship In such a minimum structural unit, a metal honeycomb body having a structure in which each end of the minimum structural unit contacts the inner wall surface of the metal casing is proposed. For example,
As a metal honeycomb body having the above structure, Japanese Patent Laid-Open No. 62-27
No. 3051, Special Publication No. 3-502544, Special Publication 3-5
No. 02660, Japanese Patent Laid-Open No. 4-227855, etc., propose an S-shaped type, a tongue-shaped type, and an X-wrap type (swastoid) type metal honeycomb body.

The above-mentioned S-shaped type metal honeycomb body is superior to the conventional spiral wound type honeycomb body. This is because in the conventional wound type honeycomb body, one minimum constitutional unit composed of a set of flat plate-shaped strip and corrugated plate-shaped strip as described above is arranged along the inner wall surface of the metal casing. In contrast to abutting, each end of a predetermined number of minimum constituent units abuts the inner wall surface of the metal casing, so that thermal stress can be absorbed and relaxed at each end, and This is because the durability can be improved.

Among various types of metal honeycomb bodies other than the wound type constituting the above-mentioned metal carrier, especially in the X-wrap type metal honeycomb body, the durability of the outer peripheral portion is the wound type metal honeycomb as described above. It is an improvement over the body. However, there is an increasing demand for improved performance of a metal carrier having the X-wrap type metal honeycomb body as a main constituent element. For example, prevention of detachment (desorption) of a metal honeycomb body from a metal casing, metal It is required to improve the durability of the central part of the honeycomb body.

Among the characteristics required for the metal carrier whose main constituent is the X-wrap type metal honeycomb body, the metal honeycomb body is detached from the metal casing (desorption) by the outer peripheral surface portion of the metal honeycomb body. And due to the difference in temperature gradient between the inner peripheral surface of the metal casing, and is further increased by the addition of external vibration. Also,
The decrease in durability of the central part of the metal honeycomb body is caused by the temperature gradient difference between the central part and the outer peripheral part of the metal honeycomb body, and the central part of the metal honeycomb body pops out in the axial direction of the metal honeycomb body. The prevention or suppression of (called telescoping, film out, etc.) is a major issue.

In particular, the X-wrap type metal honeycomb body has at least three stacks (X _{1 to} X) formed by alternately stacking flat plate-shaped band members and corrugated plate-shaped band members in a desired number of stages.
_(n , n is an integer of 3 or more) are abutted to each other at one contact end, and each stack is wound around the contact end in the same direction. Has a structure that is weak against a large thermal stress generated inside the metal honeycomb body. Therefore, in the X-wrap type metal honeycomb body, in addition to the improvement of the former metal honeycomb body and the metal casing for preventing separation (separation), the structure of the metal honeycomb body has durability (resistance Special consideration must be given to the improvement of thermal shock resistance). Deformation, buckling of the strip material (a flat strip material and a corrugated strip material) forming the metal honeycomb body in conjunction with the telescoping phenomenon,
Since cracks and breakages are induced, how to reduce these defects must be considered.

[0011]

The present invention is based on the above-mentioned X
-To overcome the drawbacks of a metal carrier (MS) having a lap-type metal honeycomb body as a main component. The present inventors have diligently studied to solve the above-mentioned drawbacks. As a result, X as a component of the metal carrier
-When the beam welding method is applied from the outside of the metal casing in place of the conventional brazing method in the method of fixing the lap type metal honeycomb body and the metal casing, the above-mentioned phenomenon which is not found in the conventional spiral wound type In connection with the structure unique to the metal honeycomb body, the seam joining by beam welding (the beam welding method of the present invention and the conventional brazing method are not accurate, but the difference between the point welding and the line welding) However, it has been found that the two components have excellent durability to withstand separation from each other.

Further, since the respective end portions of the X-wrap type metal honeycomb member, that is, the flat plate-shaped band member and the corrugated plate-shaped band member are fixed to the inner wall surface of the metal casing by beam welding, the metal honeycomb When a deforming force based on a large thermal stress is generated inside the body and each end tries to deform at the abutting part of the inner wall surface of the metal casing, the reaction force from each welding point increases the rigidity inside the metal honeycomb body. Therefore, it was also found that the durability in the radial direction as well as the axial direction of the metal honeycomb body is improved. Furthermore, since the metal carrier (MS) having sufficient durability is manufactured only by fixing both components (the metal honeycomb body and the metal casing) by the beam welding method, the conventional high temperature brazing material such as Ni diameter and the like It has also been found that it is possible to manufacture a metal carrier which is excellent in economic efficiency and has high productivity as compared with brazing using a material.

The present invention has been completed on the basis of the above-mentioned findings. The present invention not only prevents separation (separation) between the metal honeycomb body and the metal casing, but also in the axial direction of the metal honeycomb body. Provided is a metal carrier mainly composed of an economical X-wrap type metal honeycomb body having excellent radial durability.

[0014]

SUMMARY OF THE INVENTION The present invention will be described in brief. The present invention provides at least three stacks formed by alternately laminating flat band-shaped strips and corrugated plate-shaped strips made of thin metal plates in a desired number of stages. (X _{1 to} X _n , n is an integer of 3 or more) are used, and the stacks are brought into contact with each other at their abutting end portions, and the stack is formed in the same direction around the abutting end portion. A metal honeycomb body (XH) for carrying an exhaust gas purifying catalyst having a structure in which each flat plate member of each stack and a corrugated plate member are in contact with an inner wall surface of a metal casing encased therein; A metal carrier comprising a metal casing (C) for accommodating a body, and (i) both components of the metal honeycomb body (XH) and the metal casing (C),
The present invention relates to a metal carrier, which is fixed from the outside of a metal casing (C) by a beam welding method.

The technical construction and embodiments of the present invention will be described in detail below with reference to the drawings. Needless to say, the present invention is not limited to the illustrated one.

As described above, according to the present invention, in the metal honeycomb body and the metal casing, which are the main constituent elements of the metal carrier, the metal honeycomb body is constituted by an X-wrap type having a special structure, In connection with this, the beam welding method is applied to the fixing to the metal casing to improve the characteristics of the metal carrier.

The metal carrier of the present invention is characterized in that an X-wrap type metal honeycomb body having a special structure is used as the metal honeycomb body. here,
For the understanding of the present invention, an X-wrap type metal honeycomb body (X
H) will be described. An outline including the X-wrap type metal honeycomb body (XH) and its manufacturing process is shown in FIGS. 9 to 11. That is, FIG. 9 is a front view of an X-wrap type metal honeycomb body (XH) (however, a metal casing is also shown), and FIG. 10 is for manufacturing the metal honeycomb body (XH). FIG. 11 shows a perspective view of one stack (X ₁ ) used, and FIG. 11 shows four stacks (X ₁ , X ₂ , X ₃ , X ₄ ) used for manufacturing the metal honeycomb body (XH). FIG. 12 is an enlarged view of the central portion of the X-wrap type metal honeycomb body (XH) shown in FIG. 9 to 12, only a part of the flat plate-shaped strip (1) and the corrugated plate-shaped strip (2) are shown in order to clarify the drawings, and the other parts are omitted. .

The shape structure of the X-wrap type metal honeycomb body (XH) of the present invention is not limited to that shown in FIG.
For example, those disclosed in JP-A-4-227855 are applicable. That is, by changing the front (cross-section) shape of each stack (X _{1 to} X _n ) forming the X-wrap type metal honeycomb body (XH) and the setting method of the contact end, the front shape is the same as the above-mentioned figure. Not only the circular shape shown in FIG. 9 but also various shapes such as an elliptical shape and a race track shape are targeted. In the art, as shown in FIGS. 9 to 12, in this type of metal honeycomb body, the contact state at the contact end portion (center portion of the metal honeycomb body) of each stack is X-shaped or swollen. Therefore, it is commonly called X-wrap or swastika type.

The X-wrap type metal honeycomb body (XH) described above is formed by alternately stacking (a) a flat metal strip (1) and a corrugated strip (2) made of a thin metal plate in a desired number of stages. At least three or more stacks are formed, and (b) the stacks are brought into contact with each other at their one ends using a desired jig or the like. It is manufactured by a winding process in which each stack is wound around the contact end in the same direction. A jig having a desired structure suitable for holding or sandwiching one end of each stack used in the step (b) is an X-wrap type in which each stack is wound around the jig in the same direction. Metal honeycomb body (XH)
After manufacturing, it may be removed or integrated with the metal honeycomb body (XH). In the present invention, X
It should be noted that the wrap type metal honeycomb body (XH) is a generic term for those manufactured by the manufacturing process described above. As shown in the figure, a large number of cells (3) serving as exhaust gas passages are automatically formed by forming a stack from the flat strip (1) and the corrugated strip (2), and then forming the stack. Formed. In the structure shown in FIG. 9, one end of each stack was brought into contact with each other at an intersection angle of 90 ° in the step (b), and winding-molded in the step (c) to obtain an X-wrap type metal honeycomb body (XH). It is a thing.

The X-wrap type metal honeycomb body (XH) is packed and fixed in a metal casing (C) as shown in FIG. 9 to form a metal carrier (MS). The present invention applies the beam welding method as the fixing means, but since this point is the greatest feature of the present invention, its details will be described later.

As described above, the X-wrap type metal honeycomb body (XH) has improved durability, particularly the durability of the outer peripheral portion, as compared with, for example, a wound type metal honeycomb body. . However, as described above, the metal honeycomb body and the metal casing are separated (disengaged).
With respect to the improvement of the durability against the above, and the relative relationship with the improved durability of the outer peripheral portion of these metal honeycomb bodies, conversely, the improvement of the durability of the central portion (axial direction and radial direction) is strongly demanded.

The present invention adopts the above-mentioned technical structure in order to meet the above-mentioned required problems in a metal carrier having an X-wrap type metal honeycomb body as a main constituent element. That is, the present invention relates to a metal honeycomb body of these special structures as a means for fixing the X-wrap type metal honeycomb body (XH), which is a main component of the metal carrier, and the metal casing (C). The greatest feature is that the beam welding method is applied.
In the present invention, the beam welding method is a conventionally known method and means, for example, a laser beam welding method, an electron beam welding method, a plasma beam welding method or the like.
Hereinafter, specific embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited to these embodiments. In order to clarify the drawing, only a part of the flat plate-shaped strip (1) and the corrugated plate-shaped strip (2) are shown.

FIGS. 1 to 3 are views for explaining a metal carrier (MS) according to the first embodiment of the present invention. The metal carrier (MS) of the present invention is manufactured according to the manufacturing process described in FIGS. 9 to 12 except for beam welding. That is, the stack (X ₁ ) is rolled and formed into X
-Manufacture wrap type metal honeycomb body (XH),
The metal honeycomb body (XH) is replaced with a metal casing (C)
Fit inside and store. Next, as shown in the drawing, a laser beam welding machine (L) using a CO ₂ laser or the like is applied to the desired portion of the metal carrier (C) from the outside of the metal casing (C) to weld the metal carrier (MS) of the present invention. ) Is manufactured. In the metal carrier (MS) of the first embodiment of the present invention, as shown in the figure, a corrugated welding seam (L ₁ ) having a desired wave height and pitch width is formed in a substantially central portion of the metal casing (C). It is manufactured by irradiating a laser beam. However, the present invention is not limited to the above-described beam welding mode,
Various modifications are shown below.

2 to 3 are views for explaining the superiority brought about by the technical constitution of the present invention. Figure 2
[FIG. 3] is a partial cross-sectional view of the metal carrier (MS) manufactured in the above-described mode, as seen in a cross-section crossing the welding seam (L ₁ ). In FIG. 2, F _H is a metal honeycomb body (XH) during use of the metal carrier (MS)
Deformation force based on thermal stress generated inside is shown. The deforming force (F _H ) is applied to the metal honeycomb body (XH) at a high temperature due to the passage of the exhaust gas at a high temperature and the exothermic contact reaction between the exhaust gas and the supported catalyst. It is based on the occurrence of thermal stress. Then, the deformation force (F _H ) based on the thermal stress is applied to each strip (a flat strip and a corrugated strip) through the strips and in the winding direction as shown in the figure. Propagate in the direction.

In FIG. 2, F _W opposes the deforming force (F _H ) from the welding point (W) on the welding seam (L ₁ ) between the end of the strip and the inner wall surface of the metal casing (C). The reaction force (F _W ) is shown. As shown in FIG. 3, when the welding point (W) is not formed, the ends of the strips are deformed (F _H ) based on the thermal stress inside the metal honeycomb body (XH) to cause the inner wall surface of the metal casing (C). Deformation occurs along the line. Therefore, as compared with the case where the welding point (W) is formed, not only the stress relaxation effect due to the interaction between the end of each strip and the inner wall surface of the metal casing (C) is reduced, but also each strip is reduced. Deformation of the material end, buckling, and breakage of the belt material linked to these may occur. On the other hand, if there is a welding point (W) as shown in FIG. 2, the above-mentioned defects are eliminated by the reaction force (F _W ) from the welding point (W), and the above-mentioned deformation force (F _H ) is eliminated. The deformation force (F _W ) is relaxed around the center. Furthermore, the reaction force ( _FW )
As a result, the rigidity of the honeycomb body (XH) at high temperature is increased, so that the durability of the metal honeycomb body (XH) is improved not only in the radial direction but also in the axial direction (exhaust gas flow direction). The reaction force ( _FW ) reinforces the fragility of the central portion of the X-wrap type metal honeycomb body (XH) and has an extremely great significance.

As a method of forming the above-mentioned welding point (W), it is conceivable to adopt a known brazing method as a means for fixing the spiral type metal honeycomb body and the metal casing as described in the prior art. In the brazing method described above, a coating layer of high-temperature brazing material such as expensive Ni-based material is substantially formed on the inner wall surface of the metal casing (C), and then the metal honeycomb body is housed in a vacuum furnace. High-temperature brazing is performed in an oxidizing atmosphere. As is clear from the above, in the case of brazing, the following drawbacks are introduced. -The formation of the welding point (W) is based on the seam joining (point joining)
On the other hand, it is uneconomical because it is a wire joint using an expensive brazing material, and the productivity is also poor. Since the welding points (W) are formed in an excessively large amount as compared with the present invention, the advantage of using the S-shaped type or the B-shaped type metal honeycomb body is halved. This is because all the end portions of each band member are welded, and this portion has a rigid structure, which makes it difficult to relieve internal stress. Since the brazing material coating layer is formed in a planar shape, the constituent components of the brazing filler metal react with the constituent components of the strip material and the metal casing, and the strip material and the metal casing are deteriorated. The brazing method, which is performed in a vacuum furnace in a non-oxidizing atmosphere at a high temperature of 1000 ° C. or higher for a long time, is low in productivity and inferior in economic efficiency.

In the present invention, the flat strip material (1) used for producing the X-wrap type metal honeycomb body (XH) is used when a usual metal monolith type honeycomb body is produced. Used strips,
For example, chrome steel (chrome 13% to 25%), Fe-Cr
Heat resistant stainless steel such as 20% -Al5%, or a rare earth metal (R for improving high temperature oxidation resistance
EM) added heat resistant stainless steel, etc.
A band material of about 04 mm to 0.1 mm is used. As the corrugated strip material (2), the corrugated plate material (1) corrugated so as to have a predetermined substantially sine wave, substantially triangular wave or substantially trapezoidal wave is used. It is to be noted that the flat strip (1) and the corrugated strip (2) containing Al,
Alternatively, a material having an Al layer formed on the surface thereof is heat-treated, and whisker-like or mushroom-like alumina (Al ₂ O ₃ ) is deposited on the surface thereof. The whisker-like alumina is preferable because it can firmly hold the washcoat layer for carrying the exhaust gas purifying catalyst such as Pt, Pd, and Rh.

In the present invention, as the material of the metal casing (C) into which the X-wrap type metal honeycomb body (XH) is filled and fixed, the strip material (1) constituting the metal honeycomb body (XH) is used. The same type of heat resistant steel as in 2) may be used, or a steel having high heat and corrosion resistance may be used. In addition, a double structure with the outer part of the metal material more heat and corrosion resistant than the inner part, specifically, one using ferritic stainless steel for the inner part and austenitic stainless steel for the outer part is used May be.

FIG. 4 illustrates a metal carrier (MS) according to the second embodiment of the present invention. In the metal carrier (MS) of the second embodiment, as shown in the figure, two welding seams (L ₁ , L ₂ ) are formed by laser beam welding as compared with the first embodiment. The other configurations are the same except that they are welded together.

FIG. 5 illustrates a metal carrier (MS) according to a third embodiment of the present invention. The metal carrier (MS) of the third embodiment has two welded stitches, one on each side of the metal casing (C) with an expanded diameter portion (C ₁ ) having a desired width sandwiched around the entire outer periphery of the center portion. The laser beam welding was performed so that the lines (L ₁ , L ₂ ) were formed. Other configurations are the same as those in the first embodiment. In the metal carrier (MS) of the third embodiment, since the metal casing (C) follows the axial extension of the metal honeycomb body (XH), the durability against the separation between both components is improved. It

6 to 8 show the metal carrier (M
Stack (X ₁ ) used for producing an X-wrap type metal honeycomb body (XH) constituting S)
It shows a modified example of. That is, a typical example of the X-wrap type metal honeycomb body (XH) has been described with reference to FIGS. 9 to 12, but FIGS. 6 to 8 show modified examples of this typical example. Specifically, a modified example of the stack (X _{1 to} X _n ) used for manufacturing the X-wrap type metal honeycomb body (XH) will be shown. That is, the stacks (X _{1 to} X _n ) of these modified examples are those in which the desired number of the plate-shaped strips and / or corrugated plate-shaped strips constituting the stack is thicker than other strips. It is composed of. In the present invention, as the thick band material, the thickness of the flat plate material or the corrugated material (0.04 mm to
It goes without saying that a thicker one is selected in relation to (0.1 mm).

FIG. 6 shows that, in the stack (X ₁ ) shown in FIG. 10 (typical example), the flat plate-like strip material (11) constituting the outermost layer of the upper surface is more than the other strip materials (1, 2). It is composed of thick walls. The first modified metal honeycomb body (XH) manufactured using such a stack (X ₁ ) is
Since the thick band member (11) firmly joins the metal casing (C) and the thick band member (11) improves the rigidity of the metal honeycomb body, the metal carrier (M
The durability of S) is greatly improved.

FIG. 7 shows a flat strip (11) constituting the uppermost outermost layer of the stack (X ₁ ) shown in FIG. 10 (typical example) and another flat strip having the same thickness ( It is constructed by stacking two sheets of 1) and thicker than the other strips (1, 2). The metal honeycomb body (XH) manufactured using such a stack (X ₁ ) can exhibit the same effect as that of the first modified metal honeycomb body (XH).

FIG. 8 shows the stack (X ₁ ) shown in FIG. 10 (typical example), in which flat plate-shaped strips (11) constituting the outermost layers of the upper and lower surfaces are replaced with other strips (1, 2). It is made of a thicker material. The third modified metal honeycomb body (H ₁ ) manufactured by using such a stack (X ₁ ) is also the first to second modified metal honeycomb body (X ₁ ).
It is possible to obtain the same effect as H).

[0035]

The metal carrier comprising the metal honeycomb body of the present invention and the metal casing enclosing the metal honeycomb body is (i) adopting an X-wrap type metal honeycomb body as the metal honeycomb body, and ii) It is manufactured by a technical configuration in which a beam-welding method is applied from the outside of the casing to a metal casing that encloses the metal honeycomb body to weld the two components together.

According to the above-mentioned technical constitution of the present invention, the X-lap type metal honeycomb body beam-welded to the metal casing interacts so that both components improve durability in the presence of the beam-welding point. Therefore, a metal carrier having excellent durability can be obtained. That is, since the X-wrap type metal honeycomb body and the metal casing are beam-welded, not only the durability against separation (disengagement) between the two components is improved but also thermal stress generated inside the metal honeycomb body is improved. A large deformation force due to this is also effectively absorbed and relaxed at the end of each strip located at the beam welding point, and the reaction force from the beam welding point improves the rigidity inside the metal honeycomb body exposed to high temperatures. The durability of the metal honeycomb body in the radial direction and the axial direction (prevention of telescoping or film-out) is improved. The effect of improving the durability in the radial direction and the axial direction of the metal honeycomb body due to the reaction force is to supplement the fragility of the central portion derived from the structure of the X-wrap type metal honeycomb body of this type, and is extremely large. Have significance.

Since the metal honeycomb body and the metal casing are fixed to each other by the beam welding method, the conventional expensive Ni is used.
It is more economical than the brazing method using the base high temperature brazing material, and the metal carrier can be manufactured with higher productivity than the brazing method. In addition, the brazing method is substantially a line bonding method as compared with the point welding method of the beam welding method, and the bonding portion has a rigid structure. Therefore, the meaning of using the X-lap type metal honeycomb body is halved. It goes without saying that it will end up. Furthermore, in the brazing method, the alloying reaction between the brazing filler metal component and the components of the metal honeycomb body and / or the metal casing causes strength deterioration and heat resistance deterioration. You can keep it to the limit.

[Brief description of drawings]

FIG. 1 is a metal carrier (MS) according to a first embodiment of the present invention.
FIG.

FIG. 2 is a metal carrier (MS) according to the first embodiment of the present invention.
FIG. 6 is a diagram for explaining the influence of the formation of the welding point (W) on the effect in FIG.

FIG. 3 is a metal carrier (MS) according to the first embodiment of the present invention.
FIG. 3 is a diagram for explaining the effect of the absence of the welding point (W) on the effect in FIG.

FIG. 4 is a metal carrier (MS) according to the second embodiment of the present invention.
FIG.

FIG. 5: Metal carrier (MS) of the second embodiment of the present invention
FIG.

FIG. 6 is a front view of a first modified stack (X ₁ ) used for manufacturing a metal honeycomb body (XH) that constitutes the metal carrier (MS) of the present invention.

FIG. 7 is a front view of a second modified stack (X ₁ ) used to manufacture a metal honeycomb body (XH) that constitutes the metal carrier (MS) of the present invention. FIG. 5 is a diagram for explaining the above, and is a diagram corresponding to FIG. 4.

FIG. 8 is a front view of a third modified stack (X ₁ ) used to manufacture the metal honeycomb body (XH) that constitutes the metal carrier (MS) of the present invention.

FIG. 9: X-wrap type metal honeycomb body (X
It is a front view which abbreviate | omitted a part of metal carrier (MS) which makes H) a main component.

FIG. 10 is a metal honeycomb body (XH) shown in FIG.
FIG. 3 is a perspective view of one exemplary stack (X ₁ ) used to manufacture a stack.

FIG. 11 is a metal honeycomb body (XH) shown in FIG.
FIG. 4 is a diagram for explaining four stacks (X ₁ , X ₂ , X ₃ , X ₄ ) as typical examples used for manufacturing the above and their arrangement relationship.

FIG. 12 is a metal honeycomb body (XH) shown in FIG.
It is an enlarged view of the central part of.

[Explanation of symbols]

MS ............... metal carrier XH ............... metallic honeycomb body C ............... metal casing C ₁ ............... enlarged diameter portion L ............... laser beam welder L _1, L ₂ …………… Welding line W ……………… Welding point 1 …………… Flat plate strip 11 …………… Thick plate strip 2 …………… Corrugated strip 3 ……… Cells (mesh vents) X ₁ , X ₂ , X ₃ , X ₄ ……… Stack

Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI Technical display location B23K 15/00 501 A 26/00 310 N // B21D 47/00 C B23K 101: 02

Claims (9)

[Claims] 1. At least three stacks (X _{1 to} X _n , n is an integer of 3 or more) formed by alternately laminating flat plate-shaped strips and corrugated strips made of thin metal plates in a desired number of stages. use,
The stacks are brought into contact with each other at the contact ends at one end, and the stacks are wound and molded in the same direction around the contact ends, and the flat strips and the corrugated strips of each stack are wrapped. A metal carrier comprising a metal honeycomb body (XH) for supporting an exhaust gas purifying catalyst configured to abut an inner wall surface of the metal casing, and a metal casing (C) for housing the metal honeycomb body, (i) A metal carrier characterized in that both constituent elements of the metal honeycomb body (XH) and the metal casing (C) are fixed by a beam welding method from the outside of the metal casing (C). . 2. The metal simple substance according to claim 1, wherein the beam welding method is a laser beam, an electron beam or a plasma beam welding method. 3. Beam-welded metal casing (C)
The metal carrier according to claim 1, wherein the metal carrier is beam-welded so as to form a beam-welding sewing line that extends at least once around the outer periphery of the metal carrier. 4. The metal carrier according to claim 3, wherein the beam welding raid is a corrugated raid having a desired wave height and pitch width. 5. The metal carrier according to claim 4, wherein the beam-welding ridges are two wavy ridges that do not intersect. 6. The metal casing (C) has one or more expanded diameter portions, and is beam-welded from the outside of the metal casing (C) with the expanded diameter portion sandwiched therebetween. Item 2. The metal carrier according to item 1. 7. The flat strip material forming the uppermost outermost layer of each stack (X _{1 to} X _n ) is made of a material thicker than other strip materials. Metal carrier. 8. The flat plate-shaped strip forming the uppermost outer layer of each stack (X _{1 to} X _n ) is formed by stacking two other flat-plate-shaped strips having the same thickness. The metal carrier according to. 9. The flat strip material forming the uppermost and lowermost outermost layers of each stack (X _{1 to} X _n ) is made thicker than other strip materials. The metal carrier according to.