JPH03216267A - Manufacture of heat resistant structural body and the same body - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a heat-resistant structure used in a high-temperature environment and a method for manufacturing the same. That is, the present invention relates to a heat-resistant structure having a roll shape with a substantially honeycomb structure, which is used, for example, in a catalyst converter for purifying exhaust gas from an automobile engine, and onto which a catalyst is adhered as a carrier, and a method for manufacturing the same.

"Prior Art" Conventionally, such heat-resistant structures have generally used two types of base materials: a band-shaped corrugated sheet material and a flat sheet material, and the corrugated sheet material and the flat sheet material are overlapped and wound alternately, and then wrapped around a brazing material, etc. It was manufactured by joining.

Recently, we have also developed a heat-resistant structure that uses only a band-shaped corrugated sheet material as a base material, and is manufactured by sequentially wrapping a single sheet of corrugated sheet material, aligning its uneven protrusions, and joining them with brazing filler metal, etc. It had been.

In this recently developed heat-resistant structure, during manufacturing, it is necessary to precisely align the uneven protrusions of adjacent corrugated sheets inside and outside, that is, the tops of the crests and the bottoms of the valleys. Ta. In other words, since this heat-resistant structure does not have a flat plate interposed between them, if all the protrusions of the adjacent uneven surfaces are not aligned accurately, they will not align and will shift, resulting in the formation of a space with an approximately honeycomb structure. There was a risk.

[Problems to be Solved by the Invention J] However, the following problems have been pointed out in such conventional heat-resistant structures.

First, a conventional example using two types of base materials, the former mentioned above, a corrugated sheet material and a flat sheet material, that is, a conventional general heat-resistant structure, is as follows.

First, since two types of base materials are used: corrugated sheet materials and flat sheet materials, the number of base materials, that is, the number of members, is large, which increases the cost of this heat-resistant structure and complicates the manufacturing process. It was pointed out that

Secondly, the corrugated sheet material and the flat sheet material have different coefficients of thermal expansion, and cracks are likely to occur due to the difference in thermal expansion coefficients, resulting in a problem in the durability of this heat-resistant structure.

Next, regarding the latter mentioned above, a recently developed heat-resistant structure, it is as follows. This heat-resistant structure was developed to solve the problems of the conventional general heat-resistant structure mentioned above, and by using only corrugated sheet material,
Although the second problem was solved, the following third and fourth problems were pointed out.

Thirdly, when manufacturing this heat-resistant structure, when wrapping the corrugated sheet material, it is necessary to precisely align all the protrusions of the adjacent unevenness inside and outside, but it is extremely difficult to do so. It was pointed out that.

This heat-resistant structure has a problem in that it is not easy to manufacture. Also, in order to align the uneven protrusions in this way, it is conceivable to gradually change the pitch of the waves of the corrugated sheet material in advance, but it is also possible to change the pitch of the waves in advance in this way. It was also considered extremely difficult. In other words, this heat-resistant structure has a problem in that it is not easy to manufacture the corrugated sheet material that is the base material.

Fourthly, in manufacturing this heat-resistant structure, when the corrugated sheet material is wound, since the flat sheet material is not interposed, the irregularities of the corrugated temporary material are often crushed or the corrugated material is not positioned at a predetermined position and shifts. As a result, it has been pointed out that it is not easy to mold and maintain this heat-resistant structure as a whole into a perfect circle or other predetermined shape, and molding is accompanied by many difficulties.

This point was pointed out in the conventional example.

In view of these circumstances, the present invention has been made to solve all of the problems of the conventional methods described above.The present invention uses a corrugated sheet material and a flat soldering material, and the uneven protrusions of the corrugated sheet material are removed. Since the parts that touch each other are joined with brazing metal, firstly, there are fewer base materials, secondly, there is no occurrence of cracks due to differences in thermal expansion coefficients, and thirdly, it is easier to manufacture during manufacturing. The purpose of the present invention is to propose a method for manufacturing a heat-resistant structure and a heat-resistant structure in which there is no need to align the protrusions of the corrugated sheet material with each other, and fourthly, the corrugated sheet material does not suffer from collapse or misalignment during manufacturing. shall be.

"Means for Solving the Problem" The technical means of the present invention to achieve this object are as follows.

First, regarding claim 1, it is as follows. That is, this method for manufacturing a heat-resistant structure includes the following preparation process, molding process, and brazing process.

In the preparation process, a heat-resistant metal corrugated sheet material having a band-like shape with wave-shaped irregularities continuously bent and a flat brazing material having a band-like shape are prepared.

In the forming process, the corrugated sheet material and the brazing material are alternately wound one on top of the other to form a roll body.

In the brazing step, the roll body is then heated, and the corrugated sheets are joined together by the melted and hardened brazing material to form a substantially honeycomb structure.

Regarding claim 2, it is as follows.

That is, this heat-resistant structure is made by winding a heat-resistant metal corrugated sheet material, in which corrugated irregularities are continuously bent, into a roll having a substantially honeycomb structure. Portions of the concave and convex protrusions of the adjacent corrugated sheet materials that contact each other are joined by a brazing material.

"Function" Since the present invention consists of such means, it works as follows.

First, in the manufacturing method of claim 1, a heat-resistant structure is manufactured through a preparation process, a molding process, and a brazing process. That is, after a predetermined corrugated sheet material and a flat plate-shaped brazing material are wound to form a roll body, adjacent corrugated sheet materials are joined by the heated, melted and hardened brazing material to form a substantially honeycomb structure. Moreover, the heat-resistant structure of claim 2 is manufactured in this way, and the corrugated sheet material is wound in a roll shape having a substantially honeycomb structure, and of the concave and convex protrusions of the corrugated sheet material that are adjacent to each other on the inside and outside, the portions that touch each other are joined with a brazing material. has been done.

First, a flat plate material is not used as the base material, but only a corrugated sheet material. Therefore, this heat-resistant structure has a small number of base materials, that is, a small number of members.

Secondly, since a flat plate material is not used as the base material, this heat-resistant structure avoids the occurrence of cracks due to the difference in coefficient of thermal expansion between the corrugated plate material and the flat plate material.

In this invention, in addition to the first and second points, the following third and fourth points are also realized.

That is, thirdly, the concave and convex protrusions of adjacent corrugated sheets are joined together using melted and hardened brazing filler metal at the portions where they contact each other, that is, where they are precisely matched. Therefore, when manufacturing this heat-resistant structure, it is not necessary to precisely align all the concave and convex protrusions of adjacent corrugated sheets, and the corrugated sheets are also made with the same wave pitch, so that the pitch of the waves is gradually adjusted in advance. There is no need to change it to .

Fourthly, a flat brazing filler metal is interposed between the corrugated sheets that are wound during manufacturing. Therefore, in this heat-resistant structure, the irregularities of the corrugated sheet material are not crushed during manufacturing, and the corrugated sheet material is positioned at a predetermined position, and no positional deviation occurs.

"Example" The present invention will be described in detail below based on the example shown in the drawings.

The drawings serve to explain embodiments of the manufacturing method and heat-resistant structure according to the present invention. First, regarding the manufacturing method,
Preparation process, molding process. The brazing process etc. will be explained in order, and then the heat-resistant structure will be explained.

The preparation process is as follows.

1 and 2 are used to explain the preparation process, and FIG. 1 is a perspective view of the corrugated sheet material 1, and FIG. 2 is a perspective view of the brazing material 2.

In the preparation process, a heat-resistant metal corrugated sheet material 1 having a band-like shape with wave-shaped irregularities continuously bent and a brazing material 2 having a flat plate-like band shape are prepared.

To explain this in detail, first, the corrugated sheet material 1 is made of heat-resistant metal foil in the form of a band, and the linear corrugated unevenness of a predetermined pitch and height is created by corrugating, pressing, etc. It is formed by bending. In other words, the corrugated sheet material 1 is formed by multiple bends in which the uneven protrusions 3, that is, the tops of the ridges and the bottoms of the valleys are straight and parallel. The brazing filler metal 2 is formed into a strip of a thin flat plate, that is, a foil. For example, a nickel-based brazing filler metal is used. The brazing filler metal 2 shown in the figure is a strip-shaped piece with approximately the same width as the corrugated plate material l, but the brazing filler metal 2 may be a strip-shaped piece with various other widths. A plurality of strip-like strips may be used at predetermined intervals in the width direction of the corrugated sheet material 1.

The $bi process is like this.

Next, the molding process will be described.

FIG. 3 is a perspective view of the roll body 4, etc., for explaining the forming process.

In the forming process, the corrugated sheet material 1 and the brazing material 2 are alternately wound on top of each other to form a roll body 4. That is, in the forming process, the corrugated sheet material l and the brazing material 2 prepared in the preparatory process are simultaneously and alternately wrapped around a certain center. Then, as a columnar or roll-shaped roll body 4 such as a circle or an ellipse,
It can be assembled temporarily.

The molding process is as follows.

Next, the brazing process etc. will be described.

After that, the roll body 4 is heated, and the brazing material 2 is melted and hardened.
The corrugated sheet materials 1 are joined together. That is, in the brazing process, the roll body 4 obtained in the forming process is heated, and the brazing filler metal 2, which has a flat plate shape and is interposed between the corrugated sheet materials 1, is once melted and then hardened.

As a result, among the concave and convex protrusions 3 of the corrugated sheet material 1 that are adjacent to each other on the inside and outside, in the illustrated example, only the portions that partially touch each other are joined by the brazing filler metal 2, as shown in the schematic diagrams shown in FIGS. The heat-resistant structure 5 having a honeycomb structure is now formed.

The brazing T degree etc. are as follows.

Next, the heat-resistant structure 5 will be described.

The heat-resistant structure 5 is manufactured by such a manufacturing method, that is, through a preparation process, a molding process, and a brazing process. Fourth
The figures and FIG. 5 show the molded heat-resistant structure 5, and the fourth
The figure is a schematic perspective view of the whole, and FIG. 5 is a front view of the main parts.

The heat-resistant structure 5 is formed by winding a corrugated sheet material 1 made of heat-resistant metal in which corrugated corrugations are continuously bent into a roll having a substantially honeycomb structure. Then, the portions of adjacent corrugated sheet materials 1 that are in contact with each other on the backs of the concave and convex protrusions 3 are joined with a brazing material 2. That is, among the protrusions 3 of each unevenness in the corrugated sheet material 1 that are wound and adjacent inside and outside, that is, the tops of the winter mountains and the bottoms of the valleys, only some of the mutually contacting parts are partially shaped like a flat plate, as shown in FIG. They are joined together using a brazing filler metal 2 that has been melted and hardened.

This heat-resistant structure 5 has a substantially triangular shape in which the corrugated sheet material 1 forms a cell wall. Approximately half hexagonal, approximately trapezoidal. It has an approximately honeycomb structure, which is a planar aggregate of many hollow columnar cells of various shapes. It has strong heat resistance and can be used in high-temperature environments, has excellent strength-to-weight ratio, is lightweight, and has high rigidity and strength. It also has excellent fluid rectification effects, is easy to mold, and is cost-effective. Are known. Furthermore, since the surface area per unit volume is large, that is, the surface area of the corrugated sheet material l serving as the cell wall is also large, this heat-resistant structure 5 is used, for example, in a catalytic converter for purifying exhaust gas from an automobile engine, and is used as a supporting matrix. A catalyst is attached to the surface of the corrugated sheet material l, which is the cell wall. Note that such a heat-resistant structure 5 is normally used by being inserted into an outer cylinder (not shown).

The heat-resistant structure 5 has this structure.

The method for manufacturing the heat-resistant structure 5 and the heat-resistant structure 5 according to the present invention are as described above.

Therefore, it becomes as follows.

First, in this manufacturing method, there is a preparation process. Molding process. The heat-resistant structure 5 is manufactured by following the brazing process. That is,
After a predetermined corrugated sheet material 1 and a flat plate-shaped brazing material 3 are wound to form a roll body 4, adjacent corrugated sheet materials 1 are joined by heated, melted and hardened brazing material 2 to form a substantially honeycomb structure. Moreover, the heat-resistant structure 5 is manufactured in this manner, and is wound in a roll shape having a substantially honeycomb structure, and among the uneven protrusions 3 of the corrugated sheet material 1 that are adjacent on the inside and outside, the parts that touch each other are joined with the brazing material 2. has been done. For example, when used as a carrier for a catalyst converter in an automobile engine, etc., the exhaust gas from the automobile engine, etc. containing harmful substances passes through each cell of the approximately honeycomb structure of the heat-resistant structure 5. It is cleaned by reacting with the catalyst attached to the corrugated sheet material l, which is the wall of each cell.

Now, the method for manufacturing the heat-resistant structure 5 and the heat-resistant structure 5 are as follows: first, second, third, and fourth.

First, unlike the conventional example, a flat plate material is not used as the base material, but only a corrugated sheet material l is used. Therefore, this heat-resistant structure 5 has a small number of base materials, that is, a small number of members.

Second, similarly, a flat plate material is not used as the base material as in the conventional example, but only the corrugated sheet material 1 is used.

Therefore, this heat-resistant structure 5 avoids the occurrence of cracks due to the difference in coefficient of thermal expansion between the corrugated plate material 1 and the flat plate material.

And in this invention, these first. Along with each second point, the following third and fourth points are also realized simultaneously.

That is, thirdly, the concave and convex protrusions 3 of the corrugated sheet materials l that are wound adjacent to each other are joined by the melted and hardened brazing filler metal 2 at the portions where they touch each other, that is, where they exactly match. In the illustrated example, among the protrusions 3 of each unevenness, that is, the tops of the ridges and the bottoms of the valleys, only some of the mutually contacting parts are partially joined with the melted and hardened brazing material 2. Therefore, when manufacturing this heat-resistant structure 5, it is not necessary to precisely align all the uneven protrusions 3 of adjacent corrugated sheet materials 1. In addition, the corrugated plate material 1 which is the base material is also used with the same wave pitch,
There is no need to use a wave whose pitch is changed gradually in advance.

Fourthly, a flat brazing material 2 is interposed between the corrugated sheet materials 1 that are wound during manufacturing. Therefore, in this heat-resistant structure 5, since the flat brazing filler metal 2 functions in the same manner as the flat plate material in the conventional example during manufacturing, the unevenness of the corrugated sheet material 1 is not crushed, and the unevenness is kept in a predetermined position. positioning and no misalignment occurs.

This invention is as described above.

In addition, in the above-mentioned embodiment, one band-shaped corrugated sheet material l and one flat plate-shaped brazing material 2 were used, but the heat-resistant structure 5 according to the present invention is limited to this. Not a thing,
It is also possible to use a plurality of band-shaped corrugated sheet materials 1 and a plurality of flat plate-shaped brazing filler metals 2. In the heat-resistant structure 5 that uses a plurality of sheets and has a large number of sheets, when it is inserted into the outer cylinder during use, stress acts on the corrugated sheet material 1 from a direction that is largely inclined with respect to the outer cylinder surface. At the same time, it is dispersed into multiple sheets of corrugated sheet material. Therefore, such a heat-resistant structure 5 has the advantage of being particularly excellent in strength, such as being difficult to separate from the outer cylinder and being prevented from collapsing.

"Effects of the Invention" As explained above, in the method for manufacturing a heat-resistant structure and the heat-resistant structure according to the present invention, a corrugated sheet material and a flat brazing material are used, and the protrusions of the unevenness of the corrugated sheet material are in contact with each other. By joining the parts with brazing filler metal, the following effects are achieved.

First, this heat-resistant structure is superior in terms of cost and has a simplified manufacturing process. That is, the number of base materials, that is, the number of members, is small, which makes the manufacturing process less complicated and simpler.

Second, this heat-resistant structure also has excellent durability. That is, since a flat plate material is not used, there is no occurrence of cracks due to the difference in coefficient of thermal expansion between the corrugated plate material and the flat plate material, and the durability is excellent.

In addition, in the present invention, the following third and fourth points are simultaneously realized in addition to these first and second points.

Third, this heat-resistant structure is easy to manufacture.

That is, it is not necessary to match all the concave and convex protrusions of adjacent corrugated sheet materials on the inside and outside, and manufacturing is easy.

In addition, the base material is easy to manufacture because the corrugated sheet material has the same wave pitch.

Fourth, this heat-resistant structure can be easily molded into a predetermined shape. That is, during manufacturing, the corrugated sheet material does not collapse or shift in its unevenness, and the whole can be easily formed and maintained in a perfect circle or other predetermined shape.

As described above, the effects of the present invention are remarkable and significant, such as all the problems existing in this type of conventional example being solved at once.

[Brief explanation of drawings]

The drawings are provided to explain a method for manufacturing a heat-resistant structure and an embodiment of the heat-resistant structure according to the present invention. And what about Figures 1 and 2? Provided with an explanation of the $bi process,
FIG. 1 is a perspective view of the corrugated sheet material, and FIG. 2 is a perspective view of the brazing material. FIG. 3 is a perspective view of the roll body, etc., for explaining the forming process. 4 and 5 show the molded heat-resistant structure, FIG. 4 is a schematic perspective view of the entire structure, and FIG. 5 is a front view of the main parts. ■...Corrugated sheet material 2...Brazing material 3...Protrusion 4...Roll body 5...Heat-resistant structure Fig. 4

Claims (2)

[Claims] (1) A preparation process of preparing a heat-resistant metal corrugated sheet material in which corrugated irregularities are continuously bent and formed into a band shape, and a flat plate-shaped brazing material in the band shape, and the corrugated sheet material and the brazing material. A forming process in which the corrugated sheets are alternately wound to form a roll body, and a brazing process in which the roll body is then heated and the corrugated sheets are bonded together using the melted and hardened brazing material to form a substantially honeycomb structure. A method for manufacturing a heat-resistant structure, characterized by: (2) A heat-resistant structure in which a corrugated sheet material made of heat-resistant metal in which corrugated irregularities are continuously bent and formed is wound into a roll shape having a substantially honeycomb structure, in which the corrugated sheet material in which adjacent corrugated sheet materials have irregularities A heat-resistant structure characterized in that portions of the parts that are in contact with each other are joined by a brazing filler metal.