JP2000291426A - Manufacture of exhaust converter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent breakage of a catalyst carrier and scattering of a holding mat member by applying a force in the centripetal direction of a carrier by a fastening means for enclosing the outer peripheral side of an outer shell and fastening the same to faster the outer shell. SOLUTION: In a bearing unit 4, a support member 6 supporting a ball bearing 5 is erected on a link 8 where a support shaft 7 is connected to the center thereof and abutted on a ball bearing 5 of an outer shell 3 set in the bearing unit 4. The outer shell 3, where a holding mat member 2 enclosing the outer peripheral side of a monolithic catalyst 1, is inserted on the inside thereof is disposed in the bearing unit 4, and support shafts 7a, 7b are made close to each other by a drive means connected to the support shafts 7a, 7b provided in the bearing unit 4, and force acts on the ball bearing 5 in the centripetal direction of the monolithic catalyst 1, to fasten the outer shell 3. Thus, breakage of a catalyst carrier and scattering of the holding mat member can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing an exhaust converter for purifying exhaust gas from an internal combustion engine (engine). The present invention relates to a method for manufacturing an exhaust converter in which an outer shell formed of a flat plate is disposed on a side surface and a catalyst carrier is held inside the outer shell by the holding mat member.

[0002]

2. Description of the Related Art An exhaust converter for purifying exhaust gas from an internal combustion engine (engine) is constructed by accommodating a catalyst carrier inside a metal case. High-temperature exhaust gas flows from the engine into the exhaust converter, and the exhaust gas passes through the catalyst carrier and is purified. As the catalyst carrier, a ceramic carrier formed in a honeycomb cross section or the like is widely used in order to increase the contact area of the catalyst in contact with the exhaust gas.

[0003] In order to maintain the efficiency of the catalyst in a good state, it is preferable that the temperature of the exhaust gas is high. For this purpose, a heat insulating material is wound around the outer periphery of the catalyst carrier and interposed between the case and the case, so that the temperature of the exhaust gas can be maintained.

A technique disclosed in Japanese Patent Application Laid-Open No. 58-32917 will be described as an example of a conventional exhaust converter manufacturing method with reference to FIG. In FIG. 6, a wire net 52 is coated on the outer periphery of the monolith catalyst 51, and a monolith catalyst 51 provided between hydraulic cylinders in a state where an outer shell 53 that has been subjected to a roll process is covered on the outer periphery of the wire net 52. Recesses 54 of a pair of pressing members 54 having an inner diameter substantially matching the outer peripheral shape
a. By joining the overlapping portions of the outer shell 53, the outer shell 53 containing the monolith catalyst 51 therein can be obtained.

[0005]

However, in the conventional example described above, when a pressing force is applied to the outer shell 53 by the concave portions 54a of the pressing members 54 arranged on both sides of the monolith catalyst 51, the surface of the concave portions 54a and the Due to the frictional resistance between the recess 54a and the outer peripheral surface of the outer shell 53 with which the recess 54a contacts, a force is applied to the outer shell 53 in the direction of crushing in the left-right direction in FIG. 6 (buckling in the vertical direction in FIG. 6).

Here, when a heat-resistant holding mat member is used instead of the wire net 52, the surface pressure of the holding mat member applied to the monolith catalyst 51 is biased, and a portion where a strong surface pressure acts on the holding mat member. In such a case, there is a risk that the monolith catalyst 51 having a thin wall thickness and a low strength may be damaged. In addition, there is a possibility that the holding mat member may be scattered.

[0007] The present invention is to solve the above-mentioned problems,
The purpose is to surround the outer peripheral side surface of the catalyst carrier with a holding mat member, arrange an outer shell formed of a flat plate on the outer peripheral side surface of the holding mat member, and use the holding mat member to attach the catalyst carrier to the outer shell. In a method of manufacturing an exhaust converter held inside, there is provided a method for manufacturing an exhaust converter capable of preventing a bias of surface pressure of a holding mat member applied to a catalyst carrier and preventing damage to the catalyst carrier and scattering of the holding mat member. It is something you want to do.

[0008]

According to the present invention, there is provided a method of manufacturing an exhaust converter for purifying exhaust gas from an internal combustion engine, the method comprising the steps of: With a holding mat member,
In a method of manufacturing an exhaust converter in which an outer shell formed of a flat plate is arranged on an outer peripheral side surface of the holding mat member and the catalyst carrier is held inside the outer shell by the holding mat member, the outer peripheral side surface of the outer shell is surrounded. The outer shell is tightened by applying a force in the centripetal direction of the catalyst carrier by a tightening means for tightening the outer shell.

According to the present invention, the outer shell is moved in the direction of its free end by applying a force in the centripetal direction of the catalyst carrier by the tightening means and tightening the outer shell around the outer peripheral side surface. It can be sent without difficulty and can be molded without deformation or bias.

[0010] Therefore, the appropriate surface pressure of the holding mat member applied to the catalyst carrier can be uniformly directed and uniform in the centripetal direction of the catalyst carrier, so that damage to the catalyst carrier and scattering of the holding mat member can be prevented. Can be done.

In a case where the frictional resistance of a portion of the tightening means that comes into contact with the outer peripheral side surface of the outer shell is reduced to slide on the outer peripheral side surface of the outer shell, the outer shell is tightened up. Since the frictional resistance between the tightening means and the outer peripheral side surface of the outer shell is small, the force acting in the direction in which the outer shell is crushed can be reduced.

Therefore, the outer shell can be smoothly sent in the direction of its free end with a small frictional resistance, and can be formed without deformation or deviation, so that the surface pressure of the holding mat member applied to the catalyst carrier does not become uneven, and Damage to the catalyst carrier and scattering of the holding mat member can be effectively prevented.

In the case where the outer diameter of the catalyst carrier is measured and the amount of tightening of the outer shell is set based on the measurement result to define the outer diameter of the outer shell,
The outer shell can be tightened by varying the outer shell diameter according to the variation in the outer diameter of the catalyst carrier to keep the surface pressure of the holding mat member on the catalyst carrier constant. Breakage of the carrier and scattering of the holding mat member can be effectively prevented.

Further, a core metal member having an outer diameter corresponding to a predetermined outer diameter after the completion of the tightening of the outer shell is tightened by the tightening means simultaneously with the tightening of the outer shell. When the outer diameter of the support mat is specified, the outer shell can be tightened with an outer diameter corresponding to the outer diameter of the core metal member, and the surface pressure of the holding mat member applied to the catalyst carrier can be made constant, so that the catalyst Breakage of the carrier and scattering of the holding mat member can be prevented.

In the case where the weight of the holding mat member is measured and the outer diameter of the outer shell is defined by setting the amount of tightening of the outer shell based on the measurement result, the weight of the holding mat member is reduced. Weight of any thickness per unit area according to the measurement result (hereinafter referred to as "area density")
Can be obtained.

That is, the surface pressure of the holding mat member applied to the catalyst carrier is kept constant by changing the tightening amount of the outer shell in accordance with the surface density variation in the free state of the holding mat member on the premise that the holding mat member is compressed. Accordingly, even if the surface density of the holding mat member in the free state varies, the damage of the catalyst carrier and the scattering of the holding mat member can be effectively prevented.

Further, a change in the repulsive force of the holding mat member is measured, and based on the measurement result, a temporary increase in surface pressure due to the creep characteristic of the holding mat member is used to tighten the outer shell by the tightening means. It is preferable to control the raising speed by controlling the raising speed, since an excessive surface pressure is not applied to the catalyst carrier.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a method of manufacturing an exhaust converter according to the present invention will be specifically described with reference to the drawings. FIG.
FIG. 2 is a schematic view showing a state in which the first embodiment of the method for manufacturing an exhaust converter according to the present invention is performed. FIG. 3 is a diagram showing a temporary increase in surface pressure due to the creep characteristic of the holding mat member and an increase in surface pressure. FIG. 6 is a diagram showing a state in which is suppressed.

1 and 2, reference numeral 1 denotes a monolithic catalyst serving as a catalyst carrier made of a heat-resistant ceramic having a honeycomb shape in cross section. A holding mat member 2 made of a heat-resistant ceramic fiber mat or the like is prepared, and the outer peripheral side surface of the monolith catalyst 1 is surrounded by the holding mat member 2 and temporarily fixed with a kraft tape or the like.

Further, an outer shell 3 formed by previously performing a rolling process on a flat plate is prepared, and the holding mat member 2 surrounding the outer peripheral side surface of the monolith catalyst 1 is attached to the outer shell 3.
Insert and place inside.

Reference numeral 4 denotes a bearing unit serving as a tightening means which surrounds and tightens the outer peripheral side surface of the outer shell 3 over substantially the entire circumference. The bearing unit 4 is provided with a plurality of links 8 in which a plurality of support members 6 for rotatably supporting the ball bearing 5 are connected in a substantially circular shape so as to be rotatable about a support shaft 7. A plurality of ball bearings 5 can be rotatably abutted on the outer peripheral surface of the outer shell 3 set inside the outer shell 4.

An outer shell 3 having a holding mat member 2 surrounding the outer peripheral side surface of the monolithic catalyst 1 inserted therein.
Is disposed inside the bearing unit 4, and the support shafts 7a and 7b are brought close to each other by driving means such as a hydraulic cylinder (not shown) connected to the support shafts 7a and 7b provided at the open end of the bearing unit 4. , The respective ball bearings 5 are sequentially brought into contact with each other while sliding on the outer peripheral side surface of the outer shell 3, and the outer shell 3 is held via the holding mat member 2.
The outer shell 3 is tightened by applying a force in the centripetal direction of the monolith catalyst 1 accommodated in the outer shell 3.

In this state, after the free end of the outer shell 3 is joined by welding or the like, the support shafts 7a and 7b are separated by driving means such as a hydraulic cylinder (not shown), and the tightening by the bearing unit 4 is released. The exhaust converter in which the monolith catalyst 1 is held inside the outer shell 3 by the holding mat member 2 is taken out from inside the bearing unit 4.

According to the above configuration, a force is applied in the centripetal direction of the monolith catalyst by the bearing unit 4 serving as a tightening means so as to surround the outer peripheral side surface of the outer shell 3 over substantially the entire circumference and tighten the outer shell. The shell 3 can be easily sent in the direction of its free end, and can be formed without deformation or deviation.

Therefore, the appropriate surface pressure of the holding mat member 2 applied to the monolith catalyst 1 can be uniformly directed and uniform in the centripetal direction of the monolith catalyst 1, so that the damage of the monolith catalyst 1 and the holding mat member 2 Can be prevented from scattering.

Also, the ball bearing 5 provided on the bearing unit 4 reduces the frictional resistance at the portion that comes into contact with the outer peripheral side surface of the outer shell 3 to reduce the frictional resistance.
The frictional resistance between the bearing unit 4 for tightening the outer shell 3 and the outer peripheral surface of the outer shell 3 is small because the outer shell 3 is tightened while sliding on the outer peripheral surface of the outer shell 3. 1 does not act in the direction of crushing in the left-right direction (buckling in the vertical direction in FIG. 1).

Accordingly, the surface pressure of the holding mat member 2 applied to the monolith catalyst 1 is not biased, and the damage of the monolith catalyst 1 and scattering of the holding mat member 2 can be prevented.

Also, in the conventional example shown in FIG.
When the outer diameter and the shape of the exhaust converter to be manufactured are different, it is necessary to prepare only the type corresponding to the outer diameter and the shape of the exhaust converter for manufacturing the concave portion 54a of the pressing member 54. Can be manufactured using the same bearing unit 4 even when the outer diameter and the shape of the are different, the workability is good, and the equipment cost can be reduced.

Here, when defining the outer diameter of the outer shell 3, first, the outer diameter of the monolith catalyst 1 is measured, and the amount of tightening of the outer shell 3 by the bearing unit 4 is set based on the measurement result. good.

In this case, the outer diameter of each of the monolith catalysts 1 may be measured one by one, and the tightening amount of the outer shell 3 by the bearing unit 4 may be set at any time based on the measurement result. The outer diameter of the monolith catalyst 1 arbitrarily extracted in units may be measured, and the tightening amount of the outer shell 3 by the bearing unit 4 may be set for each production lot based on the measurement result.

According to the above construction, the surface pressure of the holding mat member 2 applied to the monolith catalyst 1 can be made constant by changing the amount of the outer shell 3 tightened according to the variation in the outer diameter of the monolith catalyst 1. Therefore, even if the outer diameter of the monolith catalyst 1 varies, the damage of the monolith catalyst 1 and the scattering of the holding mat member 2 can be effectively prevented.

As another method for defining the outer diameter of the outer shell 3, first, the weight of the holding mat member 2 is measured, and the tightening amount of the outer shell 3 by the bearing unit 4 is determined based on the measurement result. Just set it.

The holding mat member 2 is set in a compressed state by being pressed between the monolith catalyst 1 and the outer shell 3. However, when the holding mat member 2 is wound alone on the outer peripheral side surface of the monolith catalyst 1. , Is in a substantially natural state released from compression, and has a large variation in thickness.

On the other hand, the planar shape in the direction orthogonal to the thickness direction of the holding mat member 2 is substantially uniform by die-cutting or the like so that the planar shape when the outer peripheral side surface of the monolithic catalyst 1 is expanded is substantially the same. By measuring the weight of the holding mat member 2, the surface pressure applied to the monolith catalyst 1 of the holding mat member 2 when the outer shell 3 is tightened can be predicted.

Here, based on the result of measuring the weight of the holding mat member 2, a weight of an arbitrary thickness per unit area of the holding mat member 2 (hereinafter referred to as "area density") can be obtained.

That is, the tightening amount of the outer shell 3 is changed according to the variation in the surface density in the free state of the holding mat member 2 on the premise that the holding mat member 2 is compressed, and the holding mat member 2 Since the surface pressure can be made constant, even if the surface density of the holding mat member 2 varies in a free state, damage to the monolith catalyst 1 and scattering of the holding mat member 2 can be effectively prevented.

Also in this case, the weight of each holding mat member 2 is measured one by one, and based on the measurement result,
The tightening amount of the outer shell 3 by the bearing unit 4 may be set, or the weight of the holding mat member 2 arbitrarily extracted for each production lot may be measured, and the bearing unit 4 may be set for each production lot based on the measurement result. Of the outer shell 3 may be set.

Further, the holding mat member 2, which is an elastic body,
As shown by a curve B in FIG. 3, when the stress is applied, it has a creep characteristic in which the strain other than the elastic strain and the drying shrinkage strain increases with time, and the outer If the tightening speed of the shell 3 is high, the surface pressure of the holding mat member 2 applied to the monolith catalyst 1 temporarily becomes larger than the target surface pressure P for appropriately holding the monolith catalyst 1, and There is a possibility that an excessive surface pressure is applied to the catalyst 1.

Therefore, the change in the repulsive force of the holding mat member 2 is measured, and the tightening speed of the outer shell 3 by the bearing unit 4 is controlled on the basis of the measurement result, as shown by a curve A in FIG. Holding mat member 2
A temporary increase in surface pressure due to the creep characteristic of the monolithic catalyst 1 can be suppressed, and an excessive surface pressure can be prevented from being applied to the monolith catalyst 1.

In the above configuration, when the moving speed of a hydraulic cylinder (not shown) connected to the support shafts 7a and 7b is V _c and the compression speed of the holding mat member 2 is V _m , ΔV _m = V _c
/ [Pi ...} relationship is obtained, the hydraulic cylinder (not shown) connected to the shaft 7a, 7b from the compression velocity V _m of the retaining mat member 2 to the extent that the temporary surface pressure increase does not occur using the equation Finding the moving speed _Vc and the bearing unit 4
The speed of tightening the outer shell 3 may be set.

In this case as well, the change in the repulsive force of each of the holding mat members 2 is measured sequentially, and based on the measurement result, the outer shell 3
The change of the repulsive force of the holding mat member 2 arbitrarily extracted for each production lot may be measured, and the outer shell 3 by the bearing unit 4 for each production lot may be determined based on the measurement result. May be set.

Next, a second embodiment of a method for manufacturing an exhaust converter according to the present invention will be described with reference to FIGS. FIG. 4 and FIG. 5 are schematic views showing a state in which a second embodiment of the method for manufacturing an exhaust converter according to the present invention is performed. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

In this embodiment, as another method for defining the outer diameter of the outer shell 3, as shown in FIGS. 4 and 5, the outer shell 3 corresponds to a predetermined outer diameter after the tightening of the outer shell 3 is completed. The core member 11 having an outer diameter is tightened by the bearing unit 4 at the same time as the outer shell 3 is tightened, thereby defining the outer diameter of the outer shell 3.

That is, in the present embodiment, the metal core member 11 having a predetermined diameter is disposed at a predetermined position outside the outer shell 3 except for the support member 6 that supports the ball bearing 5, and the bearing unit 4 Outer shell 3 by
The outer shell 3 can be tightened with an outer diameter corresponding to the outer diameter of the cored bar member 11 by a part of the bearing unit 4 abutting on the outer peripheral side surface of the cored bar member 11 when tightened. It has become.

Thus, the surface pressure of the holding mat member 2 applied to the monolith catalyst 1 can be kept constant, so that the damage of the monolith catalyst 1 and the scattering of the holding mat member 2 can be prevented. Other configurations are the same as those of the first embodiment, and the same effects can be obtained.

In each of the above embodiments, an example of the exhaust converter having a substantially circular cross section is shown. However, the present invention can be applied to an exhaust converter having an elliptical cross section or various other shapes.

In each of the above embodiments, the bearing unit 4 has a ball bearing 5 attached via a support member 6 to a link 8 which is rotatable about a support shaft 7 via a support member 6 so as to be rotatable on the outer peripheral side surface of the outer shell 3. However, instead of the ball bearing 5, a roller or a roller having a rotating shaft arranged in the axial direction of the outer shell 3 may be used, or the outer bearing 3 may be in contact with the outer peripheral side surface. A belt member configured to reduce the frictional resistance of the surface may be used.

[0048]

Since the present invention has the above-described structure and operation, the outer peripheral side surface of the catalyst carrier is surrounded by a holding mat member, and an outer shell formed by a flat plate is disposed on the outer peripheral side surface of the holding mat member. In the method for manufacturing an exhaust converter in which the catalyst carrier is held inside the outer shell by the holding mat member, unevenness in the surface pressure of the holding mat member applied to the catalyst carrier is eliminated to prevent damage to the catalyst carrier and scattering of the holding mat member. A method for manufacturing an exhaust converter that can be prevented can be provided.

That is, a force acts in the centripetal direction of the catalyst carrier by the tightening means so as to surround the outer peripheral side surface of the outer shell and tighten the outer shell. Can be molded without bias.

Therefore, the appropriate surface pressure of the holding mat member applied to the catalyst carrier can be evenly directed and uniform in the centripetal direction of the catalyst carrier, so that damage to the catalyst carrier and scattering of the holding mat member can be prevented. Can be done.

In a case where the frictional resistance at the portion of the tightening means that comes into contact with the outer peripheral side surface of the outer shell is reduced so as to slide on the outer peripheral side surface of the outer shell, the outer shell is tightened up. Since the frictional resistance between the means and the outer peripheral side surface of the outer shell is small, the force acting in the direction in which the outer shell is crushed can be reduced.

Therefore, the outer shell can be easily sent in the direction of its free end with a small frictional resistance, and can be molded without deformation or deviation, so that the surface pressure of the holding mat member applied to the catalyst carrier does not become uneven, and Damage to the catalyst carrier and scattering of the holding mat member can be effectively prevented.

Further, when the outer diameter of the catalyst carrier is measured and the outer shell outer diameter is determined by setting the tightening amount of the outer shell based on the measurement result, the variation in the outer diameter of the catalyst carrier may be reduced. The surface tension of the holding mat member applied to the catalyst carrier can be kept constant by changing the tightening amount of the outer shell according to the size of the catalyst carrier. Can be effectively prevented.

Also, after the outer shell has been tightened, a core metal member having an outer diameter corresponding to a predetermined outer diameter is tightened simultaneously with the outer shell tightening by the tightening means, and the outer diameter of the outer shell is reduced. If you specify
The outer shell can be tightened with the outer diameter corresponding to the outer diameter of the core metal member, and the surface pressure of the holding mat member applied to the catalyst carrier can be kept constant. Can be prevented.

Further, when the weight of the holding mat member is measured and the outer diameter of the outer shell is determined by setting the tightening amount of the outer shell based on the measurement result, the weight measurement result of the holding mat member is obtained. Thus, a weight having an arbitrary thickness per unit area (hereinafter, referred to as “area density”) can be obtained.

That is, the tightening amount of the outer shell is changed in accordance with the variation of the surface density in the free state of the holding mat member on the assumption that the holding mat member is compressed, and the surface pressure of the holding mat member applied to the catalyst carrier is kept constant. Accordingly, even if the surface density of the holding mat member in the free state varies, the damage of the catalyst carrier and the scattering of the holding mat member can be effectively prevented.

Further, a change in the repulsive force of the holding mat member is measured, and based on the measurement result, a temporary increase in the surface pressure due to the creep characteristic of the holding mat member is used to reduce the tightening speed of the outer shell by the tightening means. It is preferable that the catalyst carrier is suppressed by controlling, since an excessive surface pressure is not applied to the catalyst carrier.

[Brief description of the drawings]

FIG. 1 shows a first method of manufacturing an exhaust converter according to the present invention.
It is a mimetic diagram showing signs that an embodiment is carried out.

FIG. 2 shows a first example of a method for manufacturing an exhaust converter according to the present invention.
It is a mimetic diagram showing signs that an embodiment is carried out.

FIG. 3 is a diagram showing a temporary increase in surface pressure due to creep characteristics of a holding mat member and a state in which the increase in surface pressure is suppressed.

FIG. 4 shows a second method of manufacturing the exhaust converter according to the present invention.
It is a mimetic diagram showing signs that an embodiment is carried out.

FIG. 5 shows a second method of manufacturing the exhaust converter according to the present invention.
It is a mimetic diagram showing signs that an embodiment is carried out.

FIG. 6 is a diagram illustrating a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Monolith catalyst 2 ... Holding mat member 3 ... Outer shell 4 ... Bearing unit 5 ... Ball bearing 6 ... Support member 7, 7a, 7b ... Support shaft 8 ... Link 11 ... Core metal member

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yasushi Kageyama 508-1 Toyocho, Hamamatsu City, Shizuoka Prefecture Inside Yutaka Giken Co., Ltd. (72) Inventor Gozo Suganuma 508-1 Toyocho Hamamatsu City, Shizuoka Prefecture Yutaka Giken Co., Ltd. (72) Inventor Shinichi Tosa 1-4-1 Chuo, Wako-shi, Saitama Prefecture Inside Honda R & D Co., Ltd. (72) Inventor Junichi Nakade 1-4-1 Chuo, Wako-shi, Saitama Honda Technology Co., Ltd. F-term in the laboratory (reference) 3G091 AB01 BA07 BA39 GA06 GB01X GB01Z GB10X GB10Z GB17X GB17Z HA27 HA28 HA29 HA31

Claims (6)

[Claims] 1. A method of manufacturing an exhaust converter for purifying exhaust gas from an internal combustion engine, wherein an outer side surface of a catalyst carrier is surrounded by a holding mat member, and an outer shell formed by a flat plate on the outer side surface of the holding mat member. And an exhaust converter for holding the catalyst carrier inside the outer shell by the holding mat member, wherein a force is applied in a centripetal direction of the catalyst carrier by a tightening means for tightening around the outer peripheral side surface of the outer shell. The method of manufacturing an exhaust converter, wherein the outer shell is tightened by acting on the outer shell. 2. The device according to claim 1, wherein the frictional resistance of a portion of the tightening means that comes into contact with the outer peripheral side surface of the outer shell is reduced to slide on the outer peripheral side surface of the outer shell. A manufacturing method of the exhaust converter according to the above. 3. The outer diameter of the outer shell is determined by measuring an outer diameter of the catalyst carrier and setting a tightening amount of the outer shell based on a result of the measurement. A method for manufacturing the exhaust converter according to claim 2. 4. A core metal member having an outer diameter corresponding to a predetermined outer diameter after completion of the tightening of the outer shell is tightened by the tightening means simultaneously with the tightening of the outer shell. The method for manufacturing an exhaust converter according to any one of claims 1 to 3, wherein an outer diameter of the exhaust converter is defined. 5. The outer diameter of the outer shell is determined by measuring a weight of the holding mat member and setting a tightening amount of the outer shell based on a result of the measurement. 5. The method for manufacturing an exhaust converter according to any one of 4. 6. A method for measuring a change in the repulsive force of the holding mat member and, based on the measurement result, temporarily increasing a surface pressure due to a creep characteristic of the holding mat member to tighten the outer shell by the tightening means. 6. A method according to claim 1, wherein the raising speed is controlled by controlling the raising speed.
The method for manufacturing an exhaust converter according to any one of the above.