JP2002097944A - Covering method of catalyst carrier and diameter- shrinkage processing device used for this method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a covering method of catalyst carrier and a diameter-shrinkage processing device used for this method capable of easily covering even a catalyst carrier of which a wall is made thinner without damaging it. SOLUTION: An outer dimension of the catalyst carrier 12 is measured and after a non- expansion member 14 is wound on the catalyst carrier and it is stored in a tubular member 16, a diameter thereof is shrunk. In a case of a plurality of catalyst carriers, the outer dimensions are measured and the diameters are shrunk. The diameter-shrinkage processing is carried out by a plurality of urging members 24 disposed along a circumferential direction of the tubular member. A diameter-shrinkage processing device 20 is provided with a plurality of urging members disposed at the outside of an object to be processed; and an input member 28 disposed at the outside and moving the urging member. The device 20 has a projection or a recessed part at an urging surface 24a and shapes the object to be processed. An urging surface shape formed by the urging surface forms an ellipse or a polygon. An engagement part of the urging member and the input member is provided with a curved surface. A movement amount of the urging member is made different by providing a plurality of input members. A plurality of urging members are disposed in a cylindrical hole direction of the object to be processed and the movement amount of the urging member is made different.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a catalyst carrier coating method for coating a catalyst carrier used for purifying exhaust gas and the like, and a diameter reducing apparatus used in the method.

[0002]

2. Description of the Related Art Conventionally, as a catalytic converter for purifying exhaust gas in an internal combustion engine, for example, a catalytic converter disclosed in JP-A-8-42333 has been known. As shown in FIG. Coated with a tubular container 32, between the catalyst carrier 30 and the tubular container 32,
An expansion mat 44 is interposed and sealed so that exhaust gas does not leak from between them.

The method of coating the catalyst carrier 30 is as follows.
First, the expansion mat 44 is wound around the outer periphery of the cylindrical catalyst carrier 30, and the catalyst carrier 30 is stored in the tubular container 32. Next, the expansion mat 44 is used for the catalyst carrier 30.
To the extent that it is compressed between
2 shrinks.

The shrinking of the tubular container 32 is performed by swaging. As shown in FIGS. 11 to 12, first, as shown in FIGS.
2 is inserted into a swaging die 36 having a pressing portion 34 called a plurality of fingers. The swaging die 36 is pushed by a ram 38 that moves by hydraulic pressure or the like, and is inserted while being in contact with the inner periphery of the annular swaging collar 40. In the swaging collar 40,
A tapered portion 42 is provided, the diameter of which is sequentially reduced along the insertion direction of the swaging die 36. For this reason, when the swaging die 36 is inserted into the swaging collar 40, it is pressed from the outside, and the annular container 32 inserted therein is contracted.

[0005]

Meanwhile, as the influence of the exhaust gas on the environment has been attracting attention, regulations on the exhaust gas in various countries have become stricter year by year, and there is a demand for improving the purification performance of a catalytic converter for purification. As a method of improving the purification performance of the catalytic converter, there is a method of increasing the cell density of the catalyst carrier by reducing the thickness of the catalyst carrier.

However, if the thickness of the catalyst carrier is reduced, the strength of the catalyst carrier naturally decreases. For this reason,
When the catalyst carrier 30 of the above-described conventional catalytic converter in which the expansion mat 44 is interposed between the catalyst carrier 30 and the annular container 32 is thinned, the expansion mat 44 expands when the temperature is increased by exhaust gas, and the catalyst carrier 30 May be pressed and damaged.

On the other hand, there are cases where a plurality of catalyst carriers are accommodated in a single tubular container and held. At this time, since the catalyst carrier is made of a ceramic material or the like, it cannot be made to have a constant outer diameter in a firing step or the like, and thus the outer diameter of the different catalyst carrier is different. Further, in the conventional method for coating the catalyst carrier 30, the tubular container 32 can be contracted only to a certain outer diameter within a range inserted into the swaging die 36.

In particular, when the tubular container 32 accommodating a plurality of catalyst carriers 30 is shrunk by the above-described conventional method for coating the catalyst carrier 30, a gap is formed between any of the expansion mats 44 and the tubular container 32, An unnecessary pressing force may be applied to any of the catalyst carriers 30. The stored catalyst carrier 3
It is desirable that a part of the tubular container 32 be shrunk to be smaller than the outer diameter of the catalyst carrier 30 so that the catalyst carrier 30 is held, so that 0 does not move in the tubular container 32. However, with the conventional coating method and the conventional shrink processing apparatus, there was a problem that the diameter of the tubular container 32 could not be partially reduced, and a great deal of work was required for operations such as welding a plurality of tubular containers.

Accordingly, the present invention has been made in view of the above-mentioned conventional problems,
It is an object of the present invention to provide a method for coating a catalyst carrier that can be easily coated without breaking even a thin-walled catalyst carrier, and a diameter reducing apparatus used in the method.

[0010]

In order to achieve the above object, a method of coating a catalyst carrier according to the present invention is directed to a method of coating a catalyst carrier used for purification of exhaust gas or the like with a tubular member. Measure the external dimensions of the catalyst support,
After the non-expandable member is wound around the catalyst carrier to a predetermined thickness and stored in the tubular member, the tubular member is reduced in diameter based on the external dimensions so that the non-expandable member abuts on the inner peripheral surface of the tubular member. It is characterized by the following.

That is, since the diameter of the tubular member is reduced based on the external dimensions of the catalyst carrier measured in advance, the inner diameter of the tubular member is separated from the catalyst carrier by a predetermined thickness of the non-expandable member. The diameter of the tubular container can be reduced easily. Therefore, since the distance between the catalyst carrier and the tubular member is accurately formed, there is no gap even if the member interposed therebetween is a non-expandable member. Furthermore, since the non-expanding member is interposed, the expanding member does not expand when the temperature is increased by the exhaust gas, and there is no possibility that the catalyst carrier is pressed and damaged.

Further, a plurality of the above-mentioned catalyst carriers are used, and the outer dimensions of the catalyst carriers are measured, and the tubular member is
The diameter is reduced based on the respective outer dimensions so that the non-expandable members abut against the inner peripheral surface.

That is, even if a plurality of catalyst carriers are accommodated in a single tubular member, the diameter of the accommodated catalyst carriers is reduced based on the outer dimensions of each catalyst carrier. There is no gap between the member and the tubular member, and no unnecessary pressing force is applied to any of the catalyst carriers.

The diameter reduction of the tubular member is performed by pressing a plurality of radially movable pressing members disposed outside the tubular member along the circumferential direction thereof so as to be radially inward from the outside. To reduce the diameter.

That is, in the diameter reduction processing, no pressing force is applied while rotating the tubular member as in the so-called spinning method. Therefore, the tubular member can be formed in a perfect circular shape without eccentricity of the center of the outer diameter of the tubular member.

The diameter reducing apparatus according to the present invention comprises a plurality of cylindrical workpieces arranged in a circumferential direction on the outer side of the cylindrical workpiece and moving inward to reduce the diameter of the workpiece. A member, and an input member that is disposed further outside the pressing member and moves in the direction of the cylindrical hole of the workpiece to engage with the pressing member to move the pressing member. A pressing surface for pressing an object has a convex portion or a concave portion in an out-of-plane direction, and the input member is moved to form an uneven portion on a part of the workpiece.

That is, by forming a concave portion or a convex portion on the pressing surface of the pressing member in accordance with the desired outer diameter shape of the workpiece, the workpiece can be easily reduced in diameter to the desired outer diameter shape. can do.

Further, a plurality of pressing members are arranged along the circumferential direction on the outer side of the cylindrical workpiece and move inward to reduce the diameter of the workpiece. And an input member that moves in the cylindrical hole direction of the workpiece and engages with the pressing member to move the pressing member, and is formed by the pressing surface of each pressing member at the final pressing position of the pressing member. Since the pressed surface shape is an elliptical shape or a polygonal shape such as a triangle or a quadrangle, the cross-sectional shape can be easily made an elliptical shape other than a circular shape or a polygonal shape.

Further, a pressing member is provided along the circumferential direction on the outer side of the cylindrical workpiece and moves inward to reduce the diameter of the workpiece. An input member that is arranged in the cylinder hole direction of the workpiece and moves to engage with the pressing member to move the pressing member, and an engaging portion between the pressing member and the input member includes At least one of them has a curved surface for gently moving the pressing member.

That is, since the pressing member moves slowly,
The amount of movement of the pressing member can be easily controlled, and the diameter of the workpiece can be easily reduced to a desired external dimension.

Further, a plurality of cylindrically arranged workpieces are arranged along the circumferential direction on the outer side, and each of the pressing members is moved inward to reduce the diameter of the workpiece, and a pressing member further outside the pressing member is provided. And an input member that moves in the cylinder hole direction of the workpiece and engages with the pressing member to move the pressing member, wherein a plurality of the input members are provided, and the pressing member is moved by the input members. It is characterized in that the moving amounts of the members are different from each other.

According to this diameter reducing apparatus, the ribs in the direction of the cylindrical hole can be easily formed on the outer peripheral surface of the workpiece by the step portions having different diameter reduction amounts for each pressing member and the gap between the pressing members. it can. Further, a pressing member which is arranged along the circumferential direction on the outside of the cylindrical workpiece and moves inward to reduce the diameter of the workpiece, and a pressing member disposed further outside the pressing member. An input member that moves in the direction of the cylindrical hole of the workpiece and engages with the pressing member to move the pressing member; a plurality of the pressing members are arranged in the cylindrical hole direction of the workpiece; It is characterized in that the moving amounts of the pressing members arranged in the cylinder hole direction which are moved by the members are different from each other.

That is, a plurality of pressing members arranged in the cylinder hole direction can be moved only by moving the input member once. Therefore, it is possible to easily form an outer peripheral shape having a plurality of cylindrical portions having different outer diameters in the cylinder hole direction of the workpiece, that is, an annular step portion.

[0024]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a cross-sectional view showing the structure of a catalytic converter manufactured by the method for coating a catalyst carrier of the present invention, and FIG. 2 is a conceptual diagram of one embodiment of a diameter reducing process performed by the method for coating a catalyst carrier. ) Is a front sectional view,
(B) is a side view.

The exhaust gas purifying catalytic converter 10 of the present embodiment comprises, for example, a columnar catalyst carrier 12 having a high cell density, a non-expansion mat 14 wound around the outer periphery thereof and made of alumina fiber or the like. And a coating tube 16 made of a steel tubular member that covers the catalyst carrier 12 around which the non-expandable mat 14 is wound. And
The catalyst carrier 12 around which the non-expandable mat 14 is wound is covered by the covering cylinder 16 without any gap therebetween.

In the method for coating the catalyst carrier 12, first, the outer diameter D1 of the catalyst carrier 12 is measured. Next, a non-expandable mat 14 formed to a predetermined thickness is wound around the outer periphery of the catalyst carrier 12. The catalyst carrier 12 around which the non-expandable mat 14 is wound is inserted into the coating cylinder 16. Both ends of the coating tube 16 are sufficiently extended from both ends of the catalyst carrier 12, and the pressing force is applied inward from the outside in the radial direction to reduce the diameter.

Next, the outer peripheral portion of the catalyst carrier 12 of the coating tube 16 is reduced in diameter. Here, one embodiment of the above-described diameter reduction processing will be described. The diameter reducing machine 20 used in this embodiment has almost the same configuration as the swaging device shown in the prior art, but differs in that the swaging collar 28 is moved by a hydraulic ram 38 (not shown). I do. That is, the diameter reducing apparatus 20 includes a swaging die 36 for accommodating the covering cylinder 16, a swaging collar 40 through which the swaging die 36 is inserted, and a swaging die 36 by pressing the swaging collar 28. And a ram 38 inserted into the inside thereof. At this time, a tapered portion 26 is provided on the inner peripheral portion of the swaging collar 28, and the diameter of the tapered portion 26 on the large diameter side is formed larger than the outer diameter of the swaging die 22. On the other hand, the diameter on the smaller diameter side is formed such that the inner diameter of the swaging die 22 inserted therethrough is a diameter obtained by combining the previously measured diameter of the catalyst carrier 12 and the thickness of the non-expandable mat 14.

The procedure of the diameter reduction processing is as follows. First, the coating cylinder 16 in which the catalyst carrier 12 around which the non-expanding mat 14 is wound is inserted is inserted into the swaging die 22.
Next, the swaging collar 28 is moved by a hydraulic ram, and is engaged with the outer periphery of the swaging die 22 and pressed. And, the swaging collar 28 is attached to the catalyst carrier 12.
After moving the swaging die 22 from the swaging collar 28 by moving the swaging die 22 in the reverse direction. Finally, the coated catalyst carrier 12 is removed from the swaging die 22.

According to the present embodiment, since the diameter of the coating cylinder 16 is reduced based on the external dimensions of the catalyst carrier 12 measured in advance, the non-expandable mat 1 is provided between the catalyst carrier 12 and the coating cylinder 16.
4, the diameter of the coating cylinder 16 can be easily reduced to the inner diameter dimension separated by a predetermined thickness. Therefore, even if the non-expandable mat 14 is interposed between the catalyst carrier 12 and the coating cylinder 16, there is no gap between them, and the purification performance of the catalytic converter 10 does not decrease.
Further, since the non-expandable mat 4 does not expand due to an increase in temperature, the catalyst carrier 12 is not damaged even if the thinned catalyst carrier 12 is used.

When a concave portion or a convex portion is formed on the pressing surface 24a of the pressing member 24 of the swaging die 22, as shown in FIG.
A part of the coating cylinder 16 can be formed in an annular step portion or an outer peripheral shape having an arbitrary uneven shape.

In particular, a single sheathing cylinder 16 as shown in FIG.
Even if two catalyst carriers 12 are housed in the inside and one of them is held in one coating cylinder 16, each catalyst carrier 1
Coating tube 16 after diameter reduction based on the outer diameters D1 and D2 of
Can be matched. Therefore, even in the catalytic converter 10 accommodating a plurality of catalyst carriers 12, a gap is formed between the non-expansion mat 14 wound around one catalyst carrier 12 and the coating cylinder 16, No external force is applied.

In the above embodiment, as shown in FIG. 5, the outer peripheral surface 24b of the pressing member 24 which engages with the swaging collar 28 or the tapered surface 28a of the swaging collar 28 is moved so that the pressing member 24 moves slowly. By forming a curved surface, the amount of movement of the pressing member 24 can be easily controlled, and the diameter of the coating cylinder 16 can be easily reduced to a desired external dimension.

As shown in FIG. 6, when the shape of the pressing surface formed by the pressing surface 24a of each pressing member 24 at the final pressing position of the pressing member 24 is elliptical or polygonal, Can be easily made not only circular but also elliptical or polygonal. Further, FIG.
As shown in FIG. 8, when the swaging collar 28 is divided into a plurality of parts and the amount of movement of the pressing member 24 moved by each of the swaging collar pieces 28 a is made different from each other, The ribs in the cylindrical hole direction can be easily formed by the steps having different diameter reduction amounts and the gap between the pressing members 24. Further, as shown in FIG. 9, two pressing members 24 are arranged in the direction of the bore of the coating cylinder 16, and the amount of movement of the pressing members 24 arranged in the direction of the bore moved by the swaging collar 28 is determined. If they are different, it is possible to move the two pressing members 24 arranged in the cylinder hole direction only by moving the swaging collar 28 once. Therefore, it is possible to easily form an outer peripheral shape having two cylindrical portions having different outer diameters in the cylinder hole direction of the coating cylinder 16, that is, an annular step portion 16a.

[0034]

As described above, according to the method for coating a catalyst carrier of the present invention, the diameter of the tubular member is reduced based on the external dimensions of the catalyst carrier measured in advance. Even if the intervening member is a non-expansion member, no gap is generated, and the purification performance as a catalytic converter does not decrease. Further, since the non-expandable member does not expand due to the temperature rise, there is no possibility that the catalyst carrier is pressed and damaged.

Further, even if a plurality of catalyst carriers are accommodated in a single tubular member, no gap is formed between the non-expandable member and the tubular member, and any one of the catalyst carriers is subjected to unnecessary pressing force. Since there is no risk of damage due to the catalyst carrier, good purification performance of the catalyst carrier can be ensured.

Further, since the diameter of the tubular member is reduced without rotating the tubular member, the tubular member can be formed in a perfect circular shape.

In the diameter reducing apparatus according to the present invention, by forming a concave portion or a convex portion on the pressing surface of the pressing member, the workpiece can be easily reduced in diameter to a desired outer diameter shape. . Further, it is easy to form the cross-sectional shape of the workpiece into an elliptical shape or a polygonal shape.

Further, since the curved portion for gently moving the pressing member is provided at the engagement portion between the pressing member and the input member, the amount of movement of the pressing member can be easily controlled.

Further, when a plurality of input members are provided and the moving amounts of the pressing members moved by the input members are made different from each other, a stepped portion having a different diameter reduction amount or a rib in the cylindrical hole direction is formed on the outer peripheral surface of the workpiece. Can be easily formed. Also, when a plurality of pressing members are arranged in the direction of the cylindrical hole, and the amounts of movement of the pressing members are made different depending on the input member, annular step portions having different outer diameters in the direction of the cylindrical hole of the workpiece can be easily formed. be able to.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a configuration of a catalytic converter manufactured by a method for coating a catalyst carrier of the present invention.

FIGS. 2A and 2B are conceptual diagrams of one embodiment of a diameter reducing process performed by a method for coating a catalyst carrier, wherein FIG. 2A is a front sectional view and FIG. 2B is a side view.

FIG. 3 is a cross-sectional view illustrating a first modification of the diameter reducing apparatus according to the present invention.

FIG. 4 is a sectional view of a catalytic converter.

FIG. 5 is a cross-sectional view showing an engagement portion between a swaging collar and a pressing member of a second modification of the diameter reducing apparatus according to the present invention.

FIG. 6 is a side view showing a third modification of the diameter reducing apparatus according to the present invention.

FIG. 7 is a conceptual diagram showing a fourth modification of the diameter reducing apparatus according to the present invention.

FIG. 8 is a conceptual diagram showing a fifth modification of the diameter reducing apparatus according to the present invention.

FIG. 9 is a side view showing a sixth modification of the diameter reducing apparatus according to the present invention.

FIG. 10 is a cross-sectional view showing a configuration of a conventional catalytic converter.

FIG. 11 is a perspective view showing a conventional swaging die.

FIG. 12 is a cross-sectional view illustrating a conventional catalyst carrier coating method and a diameter reducing apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Catalytic converter 12 Catalyst carrier 14 Non-expansion mat 16 Annular container 20 Diameter reducing device 22 Swaging die 24 Pressing member 28 Swaging collar

Continued on the front page (72) Inventor Seiji Takada 3-12-3 Nakamachidai, Tsuzuki-ku, Yokohama-shi, Kanagawa Prefecture Inside of Tokyo Roki Co., Ltd. (72) Inventor Takuya Suehara 3-123-3 Nakamachidai, Tsuzuki-ku, Yokohama-shi, Kanagawa Tokyo Roki Co., Ltd. F term (reference) 3G091 AB01 GA06 GB01Z HA27 HA31 HA47 4D048 BB05 CA07 CA08 EA08 4G069 AA01 AA08 AA11 CA03 FA03 FB66 FB79

Claims (8)

[Claims] 1. A method for coating a catalyst carrier used for purifying an exhaust gas or the like with a tubular member, the method comprising: measuring an outer dimension of the catalyst carrier; A method for coating a catalyst carrier, comprising: winding the tubular member into the tubular member; and reducing the diameter of the tubular member based on the external dimensions so that the non-expandable member comes into contact with an inner peripheral surface of the tubular member. 2. The method according to claim 1, wherein a plurality of the catalyst supports are used, and the outer dimensions of the catalyst supports are measured, and the tubular member is placed on the basis of the outer dimensions so that the non-expandable member abuts on the inner peripheral surface. The diameter is reduced by reducing the diameter.
The method for coating a catalyst carrier according to the above. 3. The process of reducing the diameter of the tubular member includes pressing a plurality of radially movable tubular members radially inward from the outside of the tubular member by a plurality of pressing members arranged along the circumferential direction and movable in the radial direction. 3. The method for coating a catalyst carrier according to claim 1, wherein the diameter is reduced by pressing the catalyst carrier. 4. A pressing member which is arranged in a plurality of positions along the circumferential direction on the outside of the cylindrical workpiece and moves inward to reduce the diameter of the workpiece, and further outside the pressing member. An input member, which is disposed in the direction of the cylindrical hole of the workpiece and engages with the pressing member to move the pressing member, wherein the pressing member has a pressing surface which presses the workpiece. A diameter reducing processing apparatus having an outwardly convex portion or a concave portion, wherein the input member is moved to form an uneven portion on a part of the workpiece. 5. A pressing member which is arranged along the circumferential direction on the outer side of the cylindrical workpiece and moves inward to reduce the diameter of the workpiece, and further outside the pressing member. And an input member that moves in the cylinder hole direction of the workpiece and engages with the pressing member to move the pressing member. The input member is formed by a pressing surface of each pressing member at a final pressing position of the pressing member. A reduced diameter processing apparatus characterized in that the pressed surface shape is an elliptical shape or a polygonal shape such as a triangle or a quadrangle. 6. A pressing member which is arranged along the circumferential direction on the outer side of a cylindrical workpiece and moves inward to reduce the diameter of the workpiece, and further outside the pressing member. And an input member that moves in the cylindrical hole direction of the workpiece and engages with the pressing member to move the pressing member. The engaging portion between the pressing member and the input member includes At least one of them has a curved surface for gently moving a pressing member. 7. A pressing member which is arranged along the circumferential direction on the outer side of the cylindrical workpiece and moves inward to reduce the diameter of the workpiece, and further outside the pressing member. And an input member that moves in the cylinder hole direction of the workpiece and engages with the pressing member to move the pressing member. A plurality of the input members are provided, and the pressing member is moved by the input members. A diameter reduction processing device characterized in that the moving amount of each member is made different. 8. A pressing member which is arranged in a circumferential direction on the outside of a cylindrical workpiece and moves inward to reduce the diameter of the workpiece, and further outside the pressing member. And an input member that moves in the direction of the cylindrical hole of the workpiece and engages with the pressing member to move the pressing member. The plurality of pressing members are disposed in the direction of the cylindrical hole of the workpiece. A diameter reducing processing device, wherein the moving amounts of the pressing members arranged in the cylindrical hole direction moved by the input member are different from each other.