JPH08131844A - Production of metallic carrier - Google Patents

Abstract

PURPOSE: To produce a metallic carrier for purification of exhaust gas excellent in durability and profitableness by adjacently disposing plural metallic honeycomb bodies, interposing a reinforcing material for joining between the adjacent edge faces of the honeycomb bodies and joining the honeycomb bodies with the reinforcing material in-between. CONSTITUTION: Two metallic honeycomb bodies H1 , H2 are adjacently disposed in metallic casing C in the axial direction, a reinforcing material A for joining is interposed between the adjacent edge faces of the honeycomb bodies H1 , H2 , and the honeycomb bodies H1 , H2 are integrated and joined with the reinforcing material A in-between to produce the objective metallic carrier MS. Since the adjacent edge faces of the honeycomb bodies H1 , H2 are joined with the reinforcing material A in-between under satisfactory strength, joining parts can be diminished as a whole, a flexible structure is imparted to the whole and the whole is made excellent in thermal stress and thermal shock resistances. The amt. of an expensive high-temp. brazing filler metal used can be reduced by the diminished joining parts.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention generally relates to a method for producing a metal carrier for purifying exhaust gas, which is used as a means for purifying exhaust gas of an automobile by being inserted in the middle of an exhaust system.

More specifically, the present invention relates to a method of manufacturing a metal carrier comprising a metal honeycomb body for supporting an exhaust gas purifying catalyst having a honeycomb structure and a metal casing for housing the metal honeycomb body. More specifically, in the present invention, in particular, the metal honeycomb body, which is a main constituent element of the metal carrier, has a joining reinforcing material disposed between adjacent end face portions of a plurality of adjacent metal honeycomb bodies. And a novel manufacturing method of a metal carrier for exhaust gas purification, which is excellent in heat fatigue resistance and economical, characterized in that each metal honeycomb body is bonded and manufactured through the bonding reinforcing material. It is a thing.

[0003]

2. Description of the Related Art A metal carrier for purifying exhaust gas is a catalyst for purifying exhaust gas having a honeycomb structure composed of a flat strip and a corrugated strip (for example, a catalyst system using Pt, Rh, Pd, etc.). A metal metal honeycomb body (hereinafter, referred to as a metal honeycomb body) for supporting the metal, and a metal casing (hereinafter, referred to as a metal casing) for accommodating and fixing the metal honeycomb body therein. It is composed of and. The metal carrier is referred to in the industry as a metal support or a metal substrate.
It may be displayed as an abbreviation (MS). The abbreviation MS is also used in the description of the invention.

Various structures have been proposed for the metal honeycomb body (hereinafter, abbreviated as H is used) which is a main constituent element of the metal carrier (MS). For example, the metal honeycomb body (H ₁ ) shown in FIG. 3, which will be described later, used for explaining the present invention is referred to as a wound type. The above-mentioned wound-type metal honeycomb body (H ₁ ) is, for example, a flat plate-shaped strip made of a heat-resistant thin steel plate having a thickness of 100 μm or less (preferably 50 μm or less) and a wave prepared by corrugating the thin steel plate. A large number of mesh vent holes (cells) for exhaust gas passages are stacked by stacking plate-like strip materials so as to have mutual abutting portions, and winding-molding them in a collective spiral shape. Is a honeycomb body (H ₁ ) having a honeycomb structure.

In addition, in addition to the above-described wound type as the metal honeycomb body in the art, various structures are produced due to the difference in the method of manufacturing the metal honeycomb body from the flat plate-shaped band material and the corrugated plate-shaped band material. Are known. For example, a layer type (see FIG. 6 to be described later) in which both strips are laminated in a layered manner, and in addition, JP-A-62-27305
No. 0, JP-A-62-173051 and JP-A-1-218.
No. 637, Japanese Patent Publication No. 3-502660, Japanese Patent Laid-Open No. 4-22
Radial type (see FIG. 7 to be described later), S-shaped type (see FIG. 8 to be described later), Tomoe type (see FIG. 9 to be described later), and X-wrap (swastika) type disclosed in No. 7855 and the like. A metal honeycomb body (see FIG. 10 described later) is known.

A conventional typical metal carrier (MS) uses one of the metal honeycomb bodies (H) having the above-mentioned structure, which is a main constituent element thereof, and uses, for example, a winding type metal shown in FIG. one metal casing of the honeycomb body (H _a) (hereinafter, abbreviations C are used.) are those composed by arranging in. And the metal carrier (MS)
Since the exhaust gas system is used under the severe thermal environment conditions, the metal honeycomb body (H) and the metal casing (C) are firmly fixed and manufactured. This is because the metal honeycomb body (H) and the metal casing (C) are exposed to the high temperature of the exhaust gas itself and the high temperature generated by the exothermic reaction between the exhaust gas and the purification catalyst, and under such a high temperature atmosphere. This is because a large thermal stress is originally applied to each element, and the elements are firmly fixed by a fixing method such as brazing or welding so as to withstand the thermal stress. In addition,
In fixing the boundary surface between the metal honeycomb body (H) and the metal casing (C), a method of fixing a specific portion has been proposed from the viewpoint of preventing the elements from separating from each other (for example, actual development 62. -19443).

On the other hand, in the metal honeycomb body (H) itself, from the viewpoint of ensuring durability under the above-mentioned severe use conditions, the contact portion between the flat plate-shaped band member and the corrugated plate-shaped band member, which are its constituent members, is also included. , Fixed by various methods and methods. For example, a contact portion between a flat band material and a corrugated plate material at a predetermined portion inside the metal honeycomb body is fixed by brazing or welding (for example, JP-B-63-44466, JP-A-2-44).
218442).

[0008]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention As described above, the conventional metal carrier (MS) is a constituent member of the metal honeycomb body (H) which is a main constituent element (a flat plate-shaped strip member and a corrugated plate-shaped strip member). ), And further, when the metal honeycomb body (H) and the metal casing (C) are fixed, a fixing means such as brazing or welding is applied. As the fixing means, a brazing method is generally adopted from the viewpoint of productivity and reliability of fixing. However, in the production of the metal carrier (MS) according to the conventional technique, a fixing method considering the durability of the metal carrier (MS) has been proposed as described above, but it is still insufficient from the viewpoint of long-term durability. It is a thing.

Further, in the manufacture of the metal carrier (MS), the brazing method is widely adopted as the fixing means as described above, and the brazing material applied to the brazing method is used under the high temperature atmosphere of the metal carrier. In terms of usage conditions, for example, it is an expensive high-temperature brazing material such as Ni-based or Ni-Cr-based, and there is a strong demand for reduction in the amount used from the economical point of view, but it is still insufficient. is there.

The present invention was devised to solve the above-mentioned problems of the prior art. The present inventors diligently studied to solve the above-mentioned problems of the conventional technology. As a result, the present inventors did not configure the metal carrier with a conventional single metal honeycomb body, but rather with a plurality of two or more metal honeycomb bodies, and the end face portions of each metal honeycomb body that are adjacent to each other. It has been found that when the fixing method of mainly joining is adopted, the problems of the prior art are solved, and a metal carrier (MS) having excellent durability and economy can be obtained. The present invention has been completed based on the above findings, and the present invention provides a novel method for producing a metal carrier for exhaust gas purification, which is excellent in durability and economical.

[0011]

The present invention will be summarized as follows.
The present invention accommodates a metal honeycomb body for carrying an exhaust gas purifying catalyst having a honeycomb structure in which a flat band member made of a thin metal plate and a corrugated plate upper band member are alternately in contact with each other, and the metal honeycomb member. In the method for producing a metal carrier including a metal casing, the metal honeycomb body has (i) a plurality of metal honeycomb bodies arranged adjacent to each other, and the end faces of the metal honeycomb bodies adjacent to each other are bonded to each other. The present invention relates to a method for manufacturing a metal carrier, which is manufactured by a step of arranging a reinforcing material for a metal honeycomb body, and (ii) a step of bonding a plurality of metal honeycomb bodies through the reinforcing material for bonding.

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.

1 to 4 are views for explaining the structure of a metal carrier (MS) according to the first embodiment of the present invention and a method for manufacturing the same. FIG. 1 is a perspective view of the metal carrier (MS), and FIG. 2 is a sectional view of the metal carrier (MS) in the axial direction. FIG. 3 is a view for explaining the structure of the metal honeycomb body (H) forming the metal carrier (MS), and is a front view seen from the metal honeycomb body (H ₁ ) side of FIG. The structure of the metal honeycomb body (H ₁ ) is a wound type as shown in the figure. FIG. 4 is a front view of the joining reinforcing material (A). As shown in the figure, the metal carrier (MS) of the first embodiment of the present invention is
Two metal honeycomb bodies (H = H ₁ + H ₂ ) are arranged adjacent to each other in the axial direction, and between the end face portions adjacent to each other,
A reinforcing material (A) for joining is arranged, and the reinforcing material (A) for joining is provided.
It is constructed by brazing each metal honeycomb body through the.

As the structure of the _two metal honeycomb bodies (H = H ₁ + H ₂ ) applied to the metal carrier (MS) of the present invention, the first metal honeycomb body (H ₁ ) is formed as shown in FIG. Alternatively, the other second metal honeycomb body (H ₂ ) may have the same structure as the first metal honeycomb body (roll type). Alternatively, it goes without saying that the second metal honeycomb body (H ₂ ) may be replaced with one having a different structure, as described later.

The greatest feature of the metal carrier (MS) of the present invention is that two metal honeycomb bodies (H = H ₁ + H ₂ ) are arranged adjacent to each other in the axial direction in a metal casing (C), and A reinforcing member (A) for bonding that ensures brazing is disposed between the end face portions adjacent to each other, and the two metal honeycomb bodies are integrally bonded via the reinforcing member (A) for bonding. There is a point. In the first embodiment, as shown in FIG. 2, the brazing is performed through the joining reinforcing material (A) over the entire area of the end faces of the _two metal honeycomb bodies (H ₁ , H ₂ ) adjacent to each other. Done. In addition,
In the present invention, as will be described later, the joining region does not have to be the entire region of the adjacent end face portions, but may be a part thereof, depending on the structure of the joining reinforcing material (A).

The reinforcing material (A) for joining applied to the production of the metal carrier (MS) of the first embodiment is the same front surface (cross section) as the first to second metal honeycomb bodies (H ₁ , H ₂ ). It has a shape and is disposed between the adjacent end face portions to improve the brazing strength between the adjacent end face portions. The reinforcing member (A) for joining shown in FIG. 4 is composed of a wire array body (non-cross shape), and by attaching the brazing material to the wire array body, the brazing joint point is surely secured. The adjacent contact surfaces of the first to second metal honeycomb bodies (H ₁ , H ₂ ) can be firmly bonded. In the wire array (bonding reinforcing material), its wire diameter and arrangement density are set to desired values so as not to increase the back pressure of exhaust gas inside the metal honeycomb body. This is due to the increase in back pressure
This is because the efficiency of the internal combustion engine is reduced.

In the present invention, the adjoining end faces of the _two metal honeycomb bodies (H ₁ , H ₂ ) have a joining reinforcing material (A).
The respective metal honeycomb bodies (H ₁ and H ₂ ) are joined together with sufficient strength. Therefore, in each of the metal honeycomb bodies (H ₁ , H ₂ ), a portion other than the adjacent end face portion to be brazed by the joining reinforcing material (A),
For example, it is possible to reduce brazing of a portion that is susceptible to deformation due to thermal stress, such as an end surface portion opposite to the adjacent end surface portion, a portion in the vicinity thereof, a portion inside each metal honeycomb body or a portion in contact with the metal casing (C). Can be done. In other words, by adopting the brazing method using the above-mentioned brazing material (A), the brazing area can be reduced as a whole, so that the brazing material (A) at the adjoining end face portion can be reduced.
A metal honeycomb body brazed through (H = H ₁ +
H ₂ ) has a flexible structure as a whole, and has a structure excellent in thermal stress and thermal shock resistance. In addition, the reduction of the brazing joint portion reduces the amount of expensive Ni-based high temperature brazing material used, and a metal carrier having excellent economical efficiency can be obtained.

In the present invention, a metal honeycomb body (H =
H ₁ + H ₂ ) and the contact surface of the metal casing (C), that is, the contact end surface portion is brazed to a metal honeycomb body (H = H ₁
The outer peripheral surface of + H ₂ ) and the inner peripheral surface of the metal casing (C) may be fixed in an appropriate manner. For example, as shown in FIG. 2, in each of the metal honeycomb bodies (H ₁ and H ₂ ), the outer peripheral surface (B) near the adjacent end surface portion where the reinforcing member (A) for bonding is arranged is formed of a metal casing. It may be brazed to the inner peripheral surface of (C). The metal honeycomb body (H =
H ₁ + H ₂ ) and the metal casing (C) are brazed together, that is, in the region (B), the metal honeycomb body (H) can maintain a flexible structure in the metal casing (C). The thermal stress absorption and relaxation characteristics are excellent. This is because the brazing joints are (A) and (B) in FIG.
This is because the other parts are in a non-fixed state.
The metal honeycomb body (H = H ₁ + H ₂ ) and the metal casing (C) are fixed to each other at the adjacent portion (B) at the adjacent end face portions of the metal honeycomb bodies (H ₁ , H ₂ ). May be performed at the same time as brazing through the joining reinforcing material (A), or the metal honeycomb body (H) previously brazed at the adjacent end face portions is housed in the metal casing (C), and Alternatively, it may be performed by a fixing means such as welding or brazing.

In the present invention, the wound type metal honeycomb body (H ₁ ) shown in FIG. 3 is manufactured by a known method. That is, a flat strip (1) made of a heat-resistant thin steel plate and a corrugated strip (2) obtained by corrugating the flat strip (1) have contact portions with each other. It is made by stacking and stacking it into a spiral shape, and a large number of mesh-like vent holes (cells) (3) are automatically formed for the exhaust gas passage in the axial direction by the roll forming. It

In the present invention, as the flat strip (1) used for producing the above-mentioned wound type metal honeycomb body (H ₁ ), a usual metal monolith type metal honeycomb body is produced. Strips sometimes used, such as chrome steel (chrome 13% to 25%), Fe-
Heat resistant stainless steel such as Cr 20% -Al 5%,
Alternatively, a band material having a thickness of about 40 μm to 100 μm, such as heat resistant stainless steel to which a rare earth metal (REM such as Ce or Y) is added to improve high temperature oxidation resistance, is used. As the corrugated strip (2), the corrugated plate (1) corrugated so as to have a predetermined substantially sine wave or trapezoidal wave is used. In addition,
The flat strip (1) and the corrugated strip (2) may have different plate thicknesses or different materials. In particular, the flat strip (1) and the corrugated strip (2) are made of Al.
It is preferable to heat-treat the one containing Al or the one provided with an Al layer on the surface thereof to deposit whisker-like or mushroom-like alumina (Al ₂ O ₃ ) on the surface thereof. The whisker-like alumina layer 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, a plurality of metal honeycomb bodies (H =) used as constituent elements of the metal carrier (MS).
It goes without saying that the structure of H ₁ ... H _n , n is an integer of 2 or more) may have the same kind of structure or different kinds of metal honeycomb bodies. That is. That is, the structure of the metal honeycomb body (H) is
The structure is not limited to the winding type described above, and may have a different structure, and these may be combined appropriately. Further, in the present invention, in each metal honeycomb body, the cell shape, the cell density, the thickness (wall thickness) of the strips (1, 2), etc. may be different from each other, and further, the outer diameters may be different. It may be. Hereinafter, metal honeycomb bodies having various structures other than the above-described wound type will be described.

FIG. 5 is a view corresponding to FIG. 3, and shows that the structure of the first metal honeycomb body (H ₁ ) is a laminated (hierarchical) type. FIG. 6 is a view corresponding to FIG. 3, and shows that the structure of the first metal honeycomb body (H ₁ ) is a radial type. FIG. 7 is a diagram corresponding to FIG. 3, in which the structure of the first metal honeycomb body (H ₁ ) is
It shows that it is an S-shaped type. FIG. 8 is a view corresponding to FIG. 3 and shows that the structure of the first metal honeycomb body (H ₁ ) is a toe-shaped type. FIG. 9 is a view corresponding to FIG. 3, and the first metal honeycomb body (H ₁ )
Indicates that the structure is of the X-wrap type.

In the above-mentioned first metal honeycomb body (H ₁ ) having various structures, the laminated (layer) type metal honeycomb body shown in FIG. 5 is a flat metal strip (1) made of a thin metal plate and a corrugated plate. The strips (2) are manufactured by stacking (stacking) the strips (2) in layers so that they come into contact with each other.

Further, the radiation type metal honeycomb body (H ₁ ) shown in FIG. 6 uses the desired number of purification elements consisting of the flat strip (1) and the corrugated strip (2) to perform the purification. It is manufactured by fixing one end of the element to a fixed shaft (center axis) and extending (radiating) each purification element from the fixed shaft. Note that only some purification elements are shown for clarity.

Further, in the above-mentioned first metal honeycomb body (H ₁ ) having various structures, the S-shaped or tongue-shaped metal honeycomb bodies shown in FIGS. 7 to 8 are manufactured as follows. It is a thing. That is, it is manufactured by using a desired number of stacks formed by alternately laminating flat plate strips (1) and corrugated strips (2) made of thin metal plates in a desired number of stages. There is a structure in which both ends of the flat plate-shaped band member and the corrugated plate-shaped band member of each stack are in contact with the inner wall surface of the metal casing that is enveloped. In the manufacturing method described above, when one stack is used, FIG.
As shown in Fig. 8, an S-shaped type in which the constituent members are curved in an S-shape in the central portion is used. When three stacks are used, three stacks are formed into a three-sided shape in the central portion shown in Fig. 8. It is possible to obtain a broken type. In addition, in order to clarify the figure, some strips (1, 2)
Only shown.

The X-wrap type metal honeycomb body shown in FIG. 9 is a flat strip (1) made of a thin metal plate.
Using four stacks (X _{1 to} X ₄ ) formed by alternately stacking and the corrugated strip (2) in a desired number of stages, each stack is mutually abutted at one end. A metal casing that is made by abutting and winding in the same direction around the relevant contact end, and enclosing each flat plate-shaped strip of each stack and one end of the corrugated strip-shaped strip. The structure is in contact with the inner wall surface of the. In the above-described manufacturing method, as shown in FIG. 9, the contact ends of the four stacks are arranged in an X shape (cross shape) at the central portion of the metal honeycomb body, and the stack ends are wrapped (wrapped). For this reason, this type of metal honeycomb body is commonly referred to as an X-lap type in the art. Note that only some of the strips (1, 2) are shown for the sake of clarity.

In the present invention, the metal honeycomb body (M
Front (cross-section) of a plurality of metal honeycomb bodies constituting S)
The shape is not limited to the circular shape shown in FIG. For example, when used in an automobile exhaust gas purification device, the front (cross-section) shape of the metal honeycomb body may be a racetrack shape, an elliptical shape, a polygonal shape, or any other irregular shape to fit the space below the vehicle body. It may be one.

The metal carrier (MS) of the present invention is constituted by accommodating and fixing a plurality of metal honeycomb bodies (H = H ₁ ... H _n ) in the metal casing (C) as described above. It is a thing. The above-mentioned metal casing (C) accommodates and fixes the metal honeycomb body (H) inside, has both ends open, and has the same cross-sectional shape as the metal honeycomb body (H). It is not restricted. That is, the front surface (cross section) of the metal honeycomb body (H)
The shape may match the shape, for example, not only a circular shape but also a race track shape, an elliptical shape, a polygonal shape, or any other irregular shape. As the material of the metal casing (C) described above, heat-resistant steel of the same kind as that of the strips (1, 2) forming the metal honeycomb body (H) may be used.
Alternatively, a double-structured metal casing having excellent heat and corrosion resistance, specifically, a double-structured metal casing using ferritic stainless steel in the inner part and austenitic stainless steel in the outer part may be used.

In the present invention, the joining reinforcing material (A) shown in FIG. 4 which is arranged between the adjacent end face portions of the first to second metal honeycomb bodies (H ₁ , H ₂ ) of the first embodiment. The structure of can be variously modified. As described above, the function of the reinforcing member (A) for bonding is that each metal honeycomb body (H = H ₁
………… Ensures fixed joining between adjacent end faces of H _n ),
In addition, it has a point of improving the bonding strength, and may have any shape and structure as long as it satisfies this. Hereinafter, modified examples of the reinforcing member (A) for joining will be described in detail with reference to the drawings, but the present invention is not limited thereto.

FIG. 10 is a front view of a first modification of the joining reinforcing material (A). The reinforcing member (A) for joining of the first modification shown in FIG. 10 is composed of a cross-shaped wire array. Compared to the wire array body of the first embodiment (see FIG. 4), the wire is woven and knitted in a cross shape.

FIG. 11 is a front view of a second modification of the joining reinforcing material (A). The joining reinforcing material (A) of the second modification shown in FIG. 11 is made of a thin-walled steel plate and made of a porous disc body. It goes without saying that the size of the hole (a) formed in the disc body is set to a size that does not increase the back pressure of the exhaust gas.

FIG. 12 is a front view of a third modification of the joining reinforcing material (A). The joining reinforcing material (A) of the third modified example shown in FIG. 12 is made of a thin net plate like the second modified example, and is composed of a porous disc body. The major difference between the third modified example and the second modified example is that the holes (a) formed in the disc body are composed of various sizes.

FIG. 13 is a front view of a fourth modification of the joining reinforcing material (A). The reinforcing material (A) for bonding of the fourth modified example shown in FIG. 13 is a concentric porous region (A ₁ , A ₂ ) in comparison with the second modified example (see FIG. 11),
And a region (A ₃ ) between the porous regions (A ₁ , A ₂ ).
The difference is that is the space part. The porous regions (A ₁ , A ₂ ) are regions that must be considered in improving the durability of the metal honeycomb body.

FIG. 14 is a sectional view of a fifth modification of the joining reinforcing material (A). The reinforcing plate (A) for joining of the 4th modification shown in FIG. 14 has a collar part (flange part) in the outer peripheral edge part in the porous disc body of the said 2nd modification (refer FIG. 11). It is a thing. That is, as shown in FIG. 14, the joining reinforcing plate (A) of the fifth modified example is constituted by a porous main body (A ₄ ) having a hole (a) and a collar (A ₅ ). is there. In this case, since the adjacent metal honeycomb bodies can be held by the flange portion (A ₅ ), the metal honeycomb bodies can be firmly bonded.

FIG. 15 is a front view of a sixth modification of the reinforcing member (A) for joining. The reinforcing material for joining (A) of the sixth modified example shown in FIG. 15 is the porous disc body of the second modified example (see FIG. 11) in which the arrangement density of the holes (a) is the central part (A).
_6), an intermediate portion (A _7), consists of those small in the direction extending to the outer peripheral portion (A _8). In this case, the central part (A ₆ )
In the above, since the arrangement density of the holes (a) is high, the exhaust gas in the central portion where the flow velocity distribution is the fastest inside the metal honeycomb body can be circulated without increasing the back pressure resistance.

FIG. 16 is a longitudinal sectional view in the axial direction of the metal carrier (MS) of the second embodiment of the present invention, and is a view corresponding to FIG. 2 relating to the first embodiment. The difference between the second embodiment and the first embodiment is that the brazing method of adjoining the end faces of two metal honeycomb bodies (H ₁ , H ₂ ) via the joining reinforcing material (A) is It is a part of the end face portion, and other configurations are substantially the same. As shown in the figure, in the adjacent end face portion, the brazing joint portion through the joint reinforcing material (A) is
₁ ) and the outer peripheral surface (A ₂ ). The joint reinforcing material (A) uses the fourth modification (see FIG. 13). According to the above-described brazing method, the central portion of the metal honeycomb body in the highest temperature region inside the metal honeycomb body and the outer peripheral portion of the metal honeycomb body where the deformation force based on the thermal stress is concentrated and accumulated are firmly joined by brazing. However, the durability is improved. The contact surfaces of the metal honeycomb body (H) and the metal casing (C) may be fixed to each other in a desired manner, which is not shown. Further, in the second embodiment, the brazing joint (A ₂ ) close to the outer peripheral portion of the metal honeycomb body may be fixed by welding instead of brazing.

FIG. 17 is an axial longitudinal sectional view of a metal carrier (MS) according to a third embodiment of the present invention, and is a view corresponding to FIG. 2 related to the first embodiment. The third embodiment is greatly different from the first embodiment in that three metal honeycomb bodies (H) are formed (H = H ₁ + H ₂ +
H ₃ ), and two adjacent end face portions are brazed to each other through the joining reinforcing material (A). In addition, in the third embodiment, the second metal honeycomb body (H ₂ ) has a rigid structure by brazing as compared with the others. Therefore, for example, the thickness (width in the axial direction) of the second metal honeycomb body (H ₂ ) or brazing is performed by using the joining reinforcing material (see FIG. 13) of the fourth modification. It is preferable to improve the durability and thermal stress relaxation of the metal honeycomb body (H ₂ ).

FIG. 18 is an axial longitudinal sectional view of a metal carrier (MS) according to a fourth embodiment of the present invention, and is a view corresponding to FIG. 2 relating to the first embodiment. The fourth embodiment is greatly different from the first embodiment in that the metal honeycomb body (H) has two outer diameters (H).
₁ and H ₂ ), and other configurations are substantially the same. In the case of the fourth embodiment, a metal casing (C) for containing the metal honeycomb body (H ₁ , H ₂ ).
Needless to say, must have a shape corresponding to the outer diameter of the metal honeycomb body (H ₁ , H ₂ ). In the fourth embodiment, the outer peripheral region of the large-diameter metal honeycomb body (H ₂ ), that is, the portion in contact with the inner peripheral surface of the metal casing (C) and the portion in the vicinity thereof is exhaust gas as shown in the drawing. Since it does not flow in, it acts as a heat insulating layer. Needless to say, holes may be bored in the strip of the metal honeycomb body (H ₂ ) so that the exhaust gas may flow into the above-mentioned portion.

[0039]

The metal carrier (MS) comprising a metal honeycomb body having a honeycomb structure for carrying the exhaust gas purifying catalyst of the present invention and a metal casing accommodating the metal honeycomb body is a main component thereof. rather than constituting a certain metallic honeycomb body one as in the prior art the (H) (single piece), composed of a plurality of ones _{(H = H 1 ......... H n} , n
Is an integer greater than or equal to 2), and the reinforcing member (A) for joining is arrange | positioned at the end surface part which adjoins each metal honeycomb body, and each metallic honeycomb body is joined via the said reinforcing member (A) for joining. Is manufactured by Thus, the bonding points of the respective metal honeycomb bodies are reliably secured and firmly bonded at the adjacent end face portions, so that the bonding strength of the parts other than the adjacent end face parts and the bonding part itself can be reduced. For example, in the prior art, due to thermal stress, the end face portion on the side opposite to the abutting end face portion and the vicinity thereof, the inside of each metal honeycomb body (the center portion or the portion abutting the metal casing and the vicinity thereof), etc. Although it is indispensable to join the portions that are susceptible to deformation, the present invention makes it possible to reduce the amount of expensive brazing filler metal used in these joining portions or to not join these joining portions.

The reduction of the joining portion contributes to the flexible structure of the metal honeycomb body and improves the heat stress resistance and the heat shock resistance of the metal honeycomb body. In addition, the reduction of the joining portion enables the provision of an economical metal carrier because an expensive high-temperature brazing material is generally used as a joining means in the production of the metal carrier.

[Brief description of drawings]

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

FIG. 2 is a metal carrier (MS) according to the first embodiment of the present invention.
FIG. 3 is an axially longitudinal sectional view of FIG.

FIG. 3 is a metal carrier (MS) according to the first embodiment of the present invention.
It is a diagram illustrating a structure (winding type) of the first metal honeycomb body that constitutes the (H _1).

FIG. 4 is a metal carrier (MS) according to the first embodiment of the present invention.
It is a front view of the reinforcement material (A) for joining applied to.

FIG. 5: Structure of another first metal honeycomb body (H ₁ ) applied to the metal carrier (MS) of the present invention (multilayer type)
It is a figure explaining.

[Fig. 6] Structure of another first metal honeycomb body (H ₁ ) applied to the metal carrier (MS) of the present invention (radiation type)
It is a figure explaining.

FIG. 7 is a diagram for explaining the structure (S-shaped type) of another first metal honeycomb body (H ₁ ) applied to the metal carrier (MS) of the present invention.

[Fig. 8] Structure of another first metal honeycomb body (H ₁ ) applied to the metal carrier (MS) of the present invention (broom-shaped type)
It is a figure explaining.

FIG. 9 is a diagram illustrating a structure (X-wrap type) of another first metal honeycomb body (H ₁ ) applied to the metal carrier (MS) of the present invention.

FIG. 10 is a front view of a joining reinforcing material (A) of a first modified example with respect to the joining reinforcing material (FIG. 4) of the first embodiment.

FIG. 11 is a front view of a joining reinforcing plate (A) of a second modified example.

FIG. 12 is a front view of a joining reinforcing plate (A) of a third modified example.

FIG. 13 is a central cross-sectional view of a reinforcing plate for joining (A) of a fourth modified example.

FIG. 14 is a front view of a joining reinforcing plate (A) of a fifth modified example.

FIG. 15 is a front view of a joining reinforcing plate (A) of a sixth modified example.

FIG. 16 shows a metal carrier (M according to the second embodiment of the present invention.
It is an axial direction longitudinal sectional view of S).

FIG. 17 shows a metal carrier (M according to a third embodiment of the present invention.
It is an axial direction longitudinal sectional view of S).

FIG. 18 shows a metal carrier (M according to a fourth embodiment of the present invention).
It is an axial direction longitudinal sectional view of S).

[Explanation of symbols]

MS ......... metal carrier _{H, H 1, H 2,} H 3 ......... metallic honeycomb body C ......... metal casing A ......... bonding reinforcement B ......... brazing metal honeycomb body and the metal casing Part 1 ………… Flat plate strip 2 ……… Corrugated strip strip 3 ……… Cell

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location B01D 53/86 ZAB F01N 3/28 ZAB 301 P Z

Claims (14)

[Claims] 1. A metal honeycomb body for carrying an exhaust gas purifying catalyst having a honeycomb structure, in which flat-plate strips and corrugated strips made of a thin metal plate are alternately in contact, and the metal honeycomb body is housed. In the method for manufacturing a metal carrier comprising a metal casing, wherein the metal honeycomb body is (i) a plurality of metal honeycomb bodies are arranged adjacent to each other,
Manufactured by a step of disposing a joining reinforcing material between the end face portions of the respective metal honeycomb bodies adjacent to each other, (ii) a step of joining a plurality of metal honeycomb bodies through the joining reinforcing material A method for producing a metal carrier, comprising: 2. The method for producing a metal carrier according to claim 1, wherein the joining reinforcing material is composed of a wire array. 3. The method for producing a metal carrier according to claim 1, wherein the joining reinforcing material is composed of a wire woven or knitted body. 4. The method for producing a metal carrier according to claim 1, wherein the joining reinforcing material is composed of a perforated plate. 5. The method for producing a metal carrier according to claim 1, wherein the joining reinforcing material has a size that occupies at least a part of the end face portions of the metal honeycomb bodies adjacent to each other. 6. The method for producing a metal carrier according to claim 1, wherein the joining is performed by brazing. 7. The method for producing a metal carrier according to claim 1, wherein the joining is performed by welding. 8. The method of manufacturing a metal carrier according to claim 1, wherein the bonding is performed by diffusion bonding. 9. The method for manufacturing a metal carrier according to claim 1, wherein the plurality of metal honeycomb bodies have different honeycomb structures. 10. A metal honeycomb body, which is a wound type, a laminated type, a radial type, an S-shaped type, a tongue-shaped type,
10. The method for producing a metal carrier according to claim 9, wherein an X-wrap type is selected. 11. The method for producing a metal carrier according to claim 1, wherein the plurality of metal honeycomb bodies are configured to have different cell shapes or cell densities. 12. The method for producing a metal carrier according to claim 1, wherein the plurality of metal honeycomb bodies are made of a strip material having a plate thickness. 13. The method for producing a metal carrier according to claim 1, wherein the plurality of metal honeycomb bodies are configured to have different outer diameters. 14. The method for producing a metal carrier according to claim 1, wherein the joining of the plurality of metal honeycomb bodies is performed in a metal casing.