JP3490947B2 - Manufacturing method of gas processing equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a method for manufacturing a gas processing device.

[0002]

2. Description of the Related Art Recent gas treatment devices, especially exhaust gas purification devices for internal combustion engines, are required to have a high degree of purification of exhaust gas. As a result, the catalytic converter has a large size and a large diameter. , High heat resistance, low pressure loss, that is, low back pressure. Therefore, even for a catalyst carrier (metal or ceramic) that has a purification function,
Thinning is required in order to increase the diameter and heat resistance, increase the reaction surface area and reduce the flow path resistance.

Since the catalyst carrier is required to have high heat resistance as described above, the catalytic converter 10 as shown in FIG.
High heat resistance is also required for the mat (holding body) 103 that holds the catalyst carrier 102 of No. 1 as a buffer, and recently, for holding the catalyst carrier made of thin-walled (multi-cell) ceramic, instead of the conventional thermal expansion property, A non-expandable and highly heat-resistant alumina fiber mat is often used. For example, JP-A-11-768.
No. 37 publication.

As shown in FIG. 10, this mat 103 is sandwiched between a metallic cylindrical body 104 of a catalytic converter 101 and a catalyst carrier 102 installed therein, to buffer the entire circumference of the catalytic carrier 102. Although it is held, if the density (filling density) of the mat in the sandwiched state is not strictly controlled, the buffer holding function will not be exhibited, and the thin catalyst carrier may be damaged.

However, the conventional method of manufacturing a general catalytic converter, that is, the mat 10 is used.
In the method of press-fitting the catalyst carrier 102 around which 3 is wound from the end of the cylindrical body 104 (the state where both the cone portions 105 and 106 are absent in FIG. 10), the matte 103 is press-fitted without deformation or damage, and the specified filling is performed. It was difficult to get the density.

[0006] In other words, in order to facilitate press fitting,
The packing density becomes smaller than the specified packing density, and a loose holding state cannot be obtained, so that proper buffer holding cannot be performed. Also, if press fitting is performed so as to reach the specified packing density, the mat 1 is pressed.
Since 03 is greatly contracted and press-fitted, the mat 103 is easily damaged.

The mat 103 shown in FIG.
The catalyst carrier wound with is inserted into a cylindrical tubular body 104 having a diameter larger than the outer diameter of the mat 103 (both cone portions 105 and 106 have the same diameter as the tubular body 104), and then the mat 10
A method of reducing the diameter of the cylindrical body 104 on the outer circumference of No. 3 is also disclosed in, for example, Japanese Patent Laid-Open No.
No. 234377.

However, in this method, when the diameter of the metal cylinder 104 is reduced, there is a spring back after the diameter reduction, so that the cylinder 104 is kept outside the predetermined compression density so that the mat 103 has a specified compression density. In order to reduce the diameter to the diameter, the diameter must be reduced to a diameter smaller than the predetermined outer diameter, so that the catalyst carrier 102 and the mat 103 are easily damaged. Furthermore, this method can obtain only a small diameter reduction (diameter difference between before and after diameter reduction), so that the catalyst support 102 becomes large and the mat 103 becomes thicker as the diameter becomes larger. It is difficult to deal with generations. Further, since this diameter reduction is performed with a die, there is a problem that it is difficult to reduce the diameter uniformly over the entire circumference, the roundness is poor, and the catalyst carrier 102 and the mat 103 may be damaged.

As a manufacturing method for surely obtaining a prescribed packing density, a method described in US Pat. No. 3,983,812 (FIGS. 11 and 12) and a method described in US Pat. No. 4,070,158 (FIGS. 13 and 14). There is.

These are called the Tourniquet (tourniquet) system, and as shown in FIG.
Is wrapped around the outer periphery of the mat 203 in a plate state to form a tubular shape, the end portions 207 and 208 are wrapped, and the brackets 209 and 210 fixed to the tubular body 204 are tightened so that they are close to each other by the fasteners to shrink the tubular body 204. The diameter of the mat 203 and the mat 203 has an optimum packing density.
This is a method of welding and fixing 7, 208 to each other. According to this method, the optimum packing density of the mat can be easily and surely obtained by setting the lap margin (lap amount) of the both end portions 207 and 208 to the specified value.

However, in both US Pat. No. 3,958,312 and US Pat. No. 4,070,158, the tubular bodies 204, 304 having only the parts containing the catalyst carriers 211, 311 and the mats 203, 303 are processed by the above method. ,
Both cones are separate bodies and processed separately,
It is joined to 4,304.

That is, in the former case (FIGS. 11 and 12), the flange portions 212 of the cone portions 205 and 206,
213 is abutted on the tubular body 204 and fixed by welding, and the latter (FIG.
3 and FIG. 14), the fitting portions 312 and 313 of the cone portions 305 and 306 are fitted into the tubular body 303 and fixed by welding.

In both the former case and the latter case, the labor and cost for producing the cone portion and the labor and cost for welding them are increased,
Furthermore, the presence of the welded portion may cause deterioration of durability strength and reliability of sealability.

Further, in the former case (FIGS. 11 and 12), it takes time and cost to form the flange portions 212 and 213 on the cone portions 205 and 206, and if the diameter of the cylindrical body 204 varies, the cone portion will be damaged. The flange portions 212 and 213 of the portions 205 and 206 must be fitted and joined together, which causes a problem of extra labor and cost for the adjustment.

Similarly, in the latter case (FIGS. 13 and 14), if the diameter of the cylindrical body 304 varies, the fitting portions 312 and 313 of both cone portions 305 and 306 are brought into close contact with the inner surface of the cylindrical body 304. Therefore, it is necessary to correct the diameters of the fitting portions 312 and 313, or to prepare various types of cone portions 305 and 306 having different fitting portions 312 and 313 and to selectively use them. There is a problem of increased cost.

Therefore, the catalyst carrier and the mat as described above can be easily installed in the cylinder, and the packing density of the mat at the time of the installation can be obtained with high accuracy, and the outer cylinder positioned on the outer periphery of the catalyst carrier and the mat. There has been a long-awaited manufacturing method for obtaining a catalytic converter in which the portion and the cone portion as described above are integrated at a low cost.

[0017]

In order to solve the above-mentioned problems, a first invention according to claim 1 is a gas treatment in which a gas treatment body is provided inside a metal cylinder through a holder. a method of manufacturing a device, a first step of wound around the holding member on the outer periphery of the gas treatment body, the outer periphery of the wound around retention member, the length than the axial length of the hold member is made of metal And in the winding direction
A tab with a step inward when winding
The formed plate is wound, and the other end of the plate in the winding direction is
A second step of forming a tubular body by welding and joining the overlapping portion of the plate material in a state where the holder is appropriately compressed by the plate material and the holder is appropriately compressed by the plate material; and at least one end portion of the tubular body And a third step of reducing the diameter by spinning.

[0018]

[0019] The second invention of claim 2, wherein, in the rear second step in the first <br/> invention, the outer periphery of the formed tubular body as described above, the axis of the tubular member A metal plate having a length substantially equal to the direction length is wound, and both ends thereof are joined and fixed to form an outer cylinder, and then at least one end of the outer cylinder is reduced in diameter by spinning to form the third cylinder. The process is performed.

[0020] A third invention according to claim 3, wherein after the second step in the first <br/> invention, the outer periphery of the formed tubular body as described above, the axial direction of the cylindrical body An outer cylinder made of a metal tube having substantially the same length as that of the outer cylinder is externally inserted, and then at least one end of the outer cylinder is reduced in diameter by spinning to perform the third step.

The fourth invention according to claim 4 is a method for producing a gas treatment apparatus for interior gas treating body via a metallic tubular body inside the holding body, held on the outer circumferential surface of the gas treatment body a first step of wound around the body, the outer periphery of the wound around retention member, an axial length substantially equal length of the hold member made of metal, and,
One end in the winding direction has a step inward when winding
Winding a plate with preformed tabs and winding direction of the plate
A second step of forming a cylinder by welding the other end of the plate to the tab from the outside and welding the overlapped part of the plate material while the holder is appropriately compressed by the plate material; A metal plate having a length longer than the axial length of the cylindrical body is wound around the outer periphery of the cylindrical body to join and fix both ends thereof to form an outer cylinder, and then at least one end of the outer cylinder is spun. And a third step of reducing the diameter by processing.

[0022] A fifth invention according to claim 5, a manufacturing method of the gas processing device for interior gas treating body via a metallic tubular body inside the holding body, held on the outer circumferential surface of the gas treatment body a first step of wound around the body, the outer periphery of the wound around retention member, an axial length substantially equal length of the hold member made of metal, and,
One end in the winding direction has a step inward when winding
Winding a plate with preformed tabs and winding direction of the plate
A second step of forming a cylinder by welding the other end of the plate to the tab from the outside and welding the overlapped part of the plate material while the holder is appropriately compressed by the plate material; A third step of externally inserting an outer cylinder made of a metal tube longer than the axial length of the cylinder to the outer circumference of the cylinder, and then reducing at least one end of the outer cylinder by spinning. And are included.

[0023]

The sixth invention of claim 6, wherein, in any one invention of the first乃<br/> Itaru 5, the diameter-reduction processing by the spinning rollers, the reduced diameter portion center axis of the cylindrical body It is applied so as to have a relationship of concentricity, eccentricity, or inclination with respect to the central axis.

[0025]

1 to 9 show an embodiment in which the present invention is applied to a catalytic converter of an internal combustion engine, and an embodiment of the present invention will be described based on this embodiment.

1 and 2 show a first embodiment.

FIG. 1 (A) is a view in which a holding body 2 is wound around the outer periphery of a catalyst carrier 1 which is a gas treating body in the first step, and the catalyst carrier 1 carries a catalyst in an internal cell. It is formed of a known metal or ceramic into a cylindrical shape having a predetermined axial direction (XX direction) length L ₁ . Holder 2
Corresponds to the mat 103 described in the above-mentioned prior art and serves to buffer-hold the catalyst carrier 1. The holding body 2 may be a well-known ceramic mat, and in particular, in view of recent demands, it is desirable that the holding body 2 is formed of a non-expandable and highly heat-resistant alumina fiber in a mat shape. Then, this is tightly attached to the outer periphery of the catalyst carrier 1 and wound in a cylindrical shape. At both ends in the winding direction, the concave portion 2a and the convex portion 2b are fitted and joined as shown in FIG. 1 (A). Alternatively, they may be brought into contact with or separated from each other without forming such unevenness.
The ends are not polymerized.

Further, the winding range and the thickness of the holding body 2 are arbitrary, but the thickness is set in consideration of the compression amount due to the tightening process of the cylindrical body in the next step.

FIG. 1B shows a metal plate member for forming a metal cylinder in the second step. The plate material 3
1B shows a state of being bent in a slightly tubular shape in FIG. 1B, but it is a flat plate in the raw material state, and the axial length L ₂ of the flat plate is the axial length L 1 of the catalyst carrier _1. And the length in the width direction (direction orthogonal to the XX direction) is set to be longer than the axial length of the holding body 2, and when the length is wound around the outer circumference of the holding body 2, both ends in the winding direction. It is set so that 3a and 3b are polymerized in a predetermined amount. Although the thickness of the plate material 3 is intentionally shown large in the drawing in the drawing, it is actually a thin plate as shown in FIG. 2 and its plate thickness is about 1.5 mm.

Further, in this flat plate state, the plate member 3
A tab 4 having a step is formed at one end 3a in the winding direction of the plate 3 so as to be stepped down so as to overlap with the inside of the other end 3b when the plate 3 is wound. Further, the step H of the tab 4
The amount of is preferably about the plate thickness so that the outer peripheral surface is continuous without step during polymerization. Further, the width D of the tab 4 may be arbitrary as long as it is overlapped with the other end 3b and weldable. Further, the tab 4 is formed over the entire length of the plate material 3 in the axial direction (XX direction). The tab 4 is formed by an arbitrary processing method such as a well-known press processing. The plate material 3 is made of, for example, stainless steel and has a thickness of about 1 to 2 mm. However, the plate material 3 is not limited to this and may be a material generally used for a catalytic converter.

Next, the second step of using the plate 3 and winding it around the outer periphery of the holder 2 will be described.

First, as shown in FIG. 1 (A), a support 2 wound around the outer periphery of a catalyst carrier 1 is provided on one side of the flat plate member 3 in the winding direction and in the axial direction X. 1 is placed in the middle part of -X, and the plate material 3 is appropriately wound by a winding means,
As shown in (C), the tab 4 formed on the one end portion 3a of the plate material 3 is superposed on the inside of the other end portion 3b of the plate material 3. Then, the rolled plate material 3 is squeezed in the circumferential direction, and the overlapping margin between the tab 4 and the other end portion 3b of the plate material 3 is set to a set value, and the diameter of the rolled plate material 3 is set to a predetermined value. To do. As a result, the holder 2 is compressed to an appropriate value, and the specified packing density is achieved.

The method of winding and superposing the plate material 3 as described above is performed by Tourniqu as described in the prior art of FIG.
The et method may be used, and without providing the brackets 209 and 210 in FIG. 12, the tab 4 and the end portion 3b themselves are pulled in the circumferential direction and pressed inward with an outer mold that wraps the entire outer circumference. Alternatively, a known winding method may be used.

After the above-mentioned polymerization, the tab 4 and the other end 3b are fixed while maintaining this polymerization margin. In this fixing method, the overlapped portion is hermetically and firmly fixed by welding such as spot welding, arc welding, seam welding, laser welding, and plasma welding over the entire area in the axial direction XX, and spinning can be performed in the next step. It is desirable to fix it.

The proper compression amount of the holding body 2 due to the proper polymerization amount is determined in advance by measuring the fixed value of the catalyst carrier 1 and the thickness of the holding body 2 before compression. Also, the compression amount (polymerization amount) is calculated, and polymerization is performed so as to conform to this, and an appropriate compression amount is obtained.

By the second step, as shown in FIG. 1 (C), the cylindrical body 5 made of the plate material 3 is formed on the outer periphery of the holder 2 wound around the outer periphery of the catalyst carrier 1 at the specified packing density. It is wound and arranged.

Then, the process shifts to the third step by spinning.

In this third step, both ends in the axial direction (XX direction) of the cylindrical body 5 in FIG. 1C, that is,
Portions 5a protruding from both ends of the catalyst carrier 1 and the holding body 2,
By spinning 5b, as shown in FIG. 1D, the tapered gradually changing portions 6 and 7 and the straight pipe portions 8 and 9 projecting to the tip end thereof are integrally reduced in diameter. In this spinning process, the cylindrical body 5 is fixed by an appropriate means, and the spinning roller 10
Revolves around the axis of the cylindrical body 5 and the cylindrical body 5
In the axial direction (X-X direction) and in the radial direction orthogonal to the axial direction. Alternatively, the cylindrical body 5 may be rotated about its axis to rotate the spinning roller 10 into a cylindrical body. 5 may be moved in the axial direction and the radial direction, and any known method may be adopted.

During this spinning process, the tab 4 of the tubular body 5 is formed in a stepped shape, and the other end 3b is fitted into the stepped portion of the tab 4 so that the outer peripheral surface of the overlapping portion of the tubular body 5 is substantially flat. Since the number is one, the spinning roller 10 can smoothly move on the outer peripheral surface of the tubular body 5, and smooth processing similar to the spinning processing performed on a normal pipe can be performed.

By this spinning process, as shown in FIG. 1 (D), the central straight pipe portion 5c (general portion) formed of the tubular body 5 is formed.
The gradual change parts 6 and 7 are integrally formed at both ends of the
A catalytic converter in which small diameter straight pipe portions 8 and 9 are integrally formed at the tip portion of 7 is manufactured.

In the embodiment shown in FIG. 1, the central axes of the gradually changing portions 6 and 7 and the straight tubular portions 8 and 9 are set to the central axis (X
This is an example formed so as to coincide (concentric) with (-X axis).

From the above, the effect of accurate compression of the holder and the ease of interior decoration by the Tourniquet method and the expansion of the shape freedom by the spinning process, for example, the diameter of the central straight pipe portion 5c of the tubular body 5 and the straight pipe portions 8 on both sides thereof. , A method of manufacturing a catalytic converter having both an effect of easily responding to a large diameter difference from the diameters of 9 and 9 and an easiness of processing was obtained.

In the above-mentioned embodiment, the tubular body 5 is formed by forming the tabs 4 on the cylindrical body 5 and superposed, but both ends of the plate member 3 may be superposed without forming the tab 4. . In this case, it is desirable to make the plate thickness as thin as possible in order to minimize the step on the outer peripheral surface in the overlapping portion. In this example, since the outer peripheral surface of the overlapping portion is not substantially flush with each other as in the above-described embodiment, the effect of smooth contact of the spinning roller as described above is less than that in the case where the step is formed. Since the plate thickness of the cylindrical body 5 is thin (1.5 mm) as described above, smooth spinning can be performed as if there is no step or valley.

3 and 4 show a second embodiment.

The second embodiment is the same as the cylindrical body 5 of the first embodiment.
This is an example in which an outer cylinder is further provided on the outer circumference of

First, as shown in FIG. 3A, in the first step, the holder 2 is wound around the outer periphery of the catalyst carrier 1 as in the first step of the first embodiment.

Next, in the second step, as in the second step of the first embodiment, as shown in FIG. 3C by the Tourniquet method.
As shown in, the plate member 3 is wound around the outer periphery of the holder 2. The plate member 3, as shown in FIG. 3 (B), wherein similarly to the first embodiment, the axial length L ₂ of the catalyst carrier 1 in the axial direction length L ₁ and the holding member 2 when wound this The length in the width direction is longer than the length in the axial direction, and the length in the width direction, when wound around the outer periphery of the holding body 2, is at both ends 3 in the winding direction.
It is set that a and 3b are polymerized in a predetermined amount.
In addition, the plate thickness of this plate material 3 is also greatly shown in the drawing,
Actually, it is thin as shown in FIG. Especially, in this second embodiment, since the number of layers is two, the plate thickness is 0.8 m.
It is formed to about m.

As for the winding of the plate material 3, as in the first embodiment, the tab 4 may be formed at one end of the plate material 3 and polymerized, and the overlapped portion may be welded. Both ends may be overlapped and welded without forming the tab 4 at one end.

Next, a plate material 11 as shown in FIG. 3 (D) is wound around the outer periphery of the cylindrical body 5 wound as shown in FIG. 3 (C). The plate material 11 is a metal plate similar to the plate material 3. Although this plate material 11 is shown in a state of being slightly bent in a tubular shape in FIG. 3D, it is flat in the material state, and the axial length L ₃ of the flat plate is the axial length of the tubular body 5. The length in the width direction (length in the direction orthogonal to the direction of L ₃ ) is set to be substantially the same as L _2, and when this is wound around the outer periphery of the tubular body 5, both ends 11 a in the winding direction thereof are set. , 11b are set to have a contacting length as shown in FIG. This plate material 1
1 is also intentionally shown large in the drawing, but actually it is shown in FIG.
As shown in, the thickness is 0.8 mm.

Then, the assembly as shown in FIG. 3 (C) is placed inside the plate material 11, the plate material 11 is wound by an appropriate means, and both ends 11a and 11b thereof are joined, and the joining is performed. Weld parts airtightly. The both ends 11a and 11b may be provided with the tab 4 as described above to be polymerized and joined, or may be simply polymerized without forming the tab 4. In any case, it is advisable to weld and fix airtightly over the entire length of the overlapped portion, but if the overlapped portion of the tubular body 5 is airtightly joined, this plate material 11
The joint may be welded without airtightness, that is, intermittent welding.

As described above, as shown in FIG. 3 (E), the outer cylinder 12 including the cylinder 5 and the plate member 11 is provided on the outer periphery of the holder 2.
However, the both ends 5a, 5b, 12a, 12b of the holding body 2
Is formed in a two-layered state in a state of protruding from both axial ends.

Next, the third process by spinning is carried out.

In this third step, both end portions 12 of the outer cylinder 12 are
Spinning is applied to the outer peripheral surface of a and 12b, and the outer cylinder 12
And both ends 12a, 12b, 5a, 5b of the tubular body 5 are simultaneously reduced in diameter in the two-layer state, and as shown in FIG. 3 (F), the taper gradually changing portions 6, 7 and the straight pipe portion 8 are formed. , 9 together and 2
It is formed with a layered wall structure.

By this spinning process, as shown in FIG. 3 (F), the central straight pipe portion 5 including the tubular body 5 and the outer tube 12 is formed.
A catalytic converter in which the gradually changing portions 6 and 7 are integrally formed at both ends of the c and 12c, and the straight pipe portions 8 and 9 having a small diameter are integrally formed at the tip portions of the both gradually changing portions 6 and 7 are manufactured.

In this third embodiment, the gradual change parts 6 and 7 are used.
The central axis of and the central axes of the straight pipe portions 8 and 9 are aligned (concentric) with the central axis of the tubular body 5.

In addition to the advantages of the first embodiment, the following advantages can be exhibited in the second embodiment.

Since the two-layer wall structure of the cylindrical body 5 and the outer cylinder 12 is provided, the plate thickness for each of these layers can be reduced, and by reducing the plate thickness of the outer cylinder 12, the outer cylinder 1
Even if both end portions in the winding direction of 2 are superposed without providing a tab, the step on the outer peripheral surface of the superposed portion is further reduced, and smooth spinning can be performed.

In particular, if the inner tubular body 5 is made of a thick plate so as to bear the strength thereof, the thickness of the outer barrel 12 can be made as thin as possible, and as a result, a spinning for further reducing the outer barrel 12 diameter. Processing becomes smooth. Therefore, Tourniqu
It is possible to effectively enjoy the effects of the et construction method and the effects of spinning processing.

In the second embodiment, the outer cylinder 12
3D is formed from the plate material 11 as shown in FIG. 3D. Instead of the plate material 11, the axial length L ₄ as shown in FIG. 5 is substantially the same as the axial length L ₂ of the cylindrical body 5. A cylindrical body 12A made of a metal tube having the same length is used.
The assembly shown in (C) may be directly inserted.
When the outer cylinder 12A made of such a metal tube is used, the step of joining the both ends 11a and 11b when the plate member 11 is used becomes unnecessary, and the manufacturing is easier and the cost can be reduced.

FIG. 6 shows a third embodiment.

The third embodiment is based on the cylindrical body 5 of the first embodiment.
Is approximately the same as the axial length of the catalyst carrier 1 and the holding body 2, and an outer cylinder is further provided on the outer circumference of the cylindrical body 5.

First, in the first step, the holder 2 is wound around the outer periphery of the catalyst carrier 1 as in the first step of the first embodiment.

Next, in the second step, as in the second step of the first embodiment, the plate member 3 is wound around the outer periphery of the holder 2 by the Tourniquet method to form the tubular body 5. In the third embodiment, the plate member 3 is, as shown in FIGS.
The length L _{5 in} the axial direction when this is wound is formed to be substantially the same as the length L _{1 in} the axial direction of the catalyst carrier ₁ and the holding body 2. As for the winding of the plate material 3, as in the first embodiment, the tab 4 may be formed at one end portion of the plate material 3 and polymerized, and the overlapped portion may be welded. Both ends may be polymerized and welded without forming the tab 4.

Next, a plate member 13 as shown in FIG. 6 (D) is wound around the outer periphery of the cylindrical body 5 wound as shown in FIG. 6 (C). The plate material 13 is a metal plate similar to the plate material 3. Although the plate member 13 is shown in a state of being slightly bent in a tubular shape in FIG. 6D, it is a flat plate in the raw material state, and the axial length L ₆ of the flat plate is the axial length of the tubular body 5. The length in the width direction (the length in the direction orthogonal to the direction of L ₆ ) is set to be longer than L ₅ , and when this is wound around the outer periphery of the tubular body 5, both ends 13 a and 13 b in the winding direction are As shown in FIG. 6E, the contact length is set.

Then, the assembly as shown in FIG. 6 (C) is arranged at the central portion of the plate member 13 in the axial direction, and the plate member 13 is wound by an appropriate means to both ends 13a,
13b are joined and the joined portion is welded in an airtight manner. The both ends 13a and 13b may be provided with the tab 4 as described above to be polymerized and joined, or may be simply polymerized without forming the tab 4, and in any case, the polymerized portion Welding is fixed in an airtight manner in the entire longitudinal direction.

As described above, as shown in FIG. 6 (E), the portion 14 protruding from both axial ends of the cylindrical body 5 is formed.
A wound outer casing 14 having a and 14b is formed.

Next, the process proceeds to the third process by spinning.

In the third step, as in the first embodiment, both ends 14a and 14b of the outer cylinder 14 are reduced in diameter by spinning with the spinning roller 10, as shown in FIG. 6 (F). Then, similarly to the first embodiment, the tapered gradually changing portions 6 and 7 and the straight pipe portions 8 and 9 are integrally formed.

By this spinning process, as shown in FIG. 6 (F), the gradually changing portions 6 and 7 are integrally formed at both ends of the central straight pipe portion 14c composed of the outer cylinder 14, and both gradually changing portions 6 and 7 are formed. A catalytic converter is manufactured in which straight pipe portions 8 and 9 having a small diameter are integrally formed at the tip of the.

In the third embodiment, the gradual change parts 6, 7 are used.
The central axis of and the central axes of the straight pipe portions 8 and 9 are aligned (concentric) with the central axis of the tubular body 5.

Also in the third embodiment, the following effects can be exhibited in addition to the effects of the first embodiment.

Since the tubular body 5 and the outer cylinder 14 have a two-layer wall structure, it is possible to reduce the plate thickness per one layer, and by reducing the plate thickness of the outer cylinder 14, the outer cylinder 1
Even if both ends in the winding direction of 4 are polymerized without providing a tab, the step difference on the outer peripheral surface of the polymerized part becomes small, and smooth spinning can be performed.

In particular, if the inner cylindrical body 5 is made of a thick plate so as to bear the strength, the plate thickness of the outer cylinder 14 can be made as thin as possible, whereby the diameter of the outer cylinder 14 can be further reduced. Processing becomes smooth. Therefore, Tourniqu
It is possible to effectively enjoy the effects of the et construction method and the effects of spinning processing.

In the third embodiment, the outer cylinder 14
6D is formed from the plate material 13 as shown in FIG. 6D. Instead of the plate material 13, the axial length L ₇ as shown in FIG. 7 is longer than the axial length L ₅ of the cylindrical body 5. A cylindrical body 14A made of a metal tube is used, and the cylindrical body 14A has the structure shown in FIG.
Alternatively, the assembly shown in may be directly inserted. When the outer cylinder 14 made of such a metal tube is used, the plate material 1
In the case of using No. 3, the step of joining the both end portions 13a and 13b is unnecessary, and the manufacturing is easier and the cost can be reduced.

FIG. 8 shows the first embodiment shown in FIG. 1 in which the gradually changing portions 6 and 7 and the straight pipe portions 8 and 9 are provided with respective central axes Y,
A fourth embodiment in which Z is eccentric with respect to the central axis X of the central straight pipe portion 5c of the cylindrical body 5 will be shown.

In order to cause the eccentricity as described above, in the spinning process, for example, as shown in FIG. 8, the central axis X of the cylindrical body 5 and the revolution axes Y and Z of the spinning roller 10 are eccentric to each other. Spinning is applied.

FIG. 9 shows the first embodiment shown in FIG. 1 in which the gradually changing portions 6 and 7 and the straight pipe portions 8 and 9 are connected to the respective central axes Y,
A fifth embodiment is shown in which Z is inclined with respect to the central axis X of the central straight pipe portion 5c of the tubular body 5.

In order to incline in this way, in the above-mentioned spinning process, for example, as shown in FIG. 9, the central axis X of the cylindrical body 5 and the revolution axes Y and Z of the spinning roller 10 are inclined with respect to each other. Give.

Note that, also in the second embodiment shown in FIG. 2 and the third embodiment shown in FIG. 3, at the time of spinning, as shown in FIG. 8 or FIG. The gradually changing portions 6 and 7 and the straight pipe portions 8 and 9 may be eccentric or inclined with respect to the central straight pipe portions 5c and 14c of the cylindrical bodies 5 and 14.

As described above, the method of eccentricity or inclining by the spinning process was previously described by the present applicant in Japanese Patent No. 295.
The methods provided in Japanese Patent No. 7153 and Japanese Patent No. 2957154 can be adopted.

In each of the above embodiments, the cylinder 5 and the outer cylinder 1 are used.
Both ends 5a, 5 of either or both
Although b, 12a, 12b, 14a, and 14b are reduced in diameter by spinning, only one of the both ends may be reduced in diameter by spinning.

Further, it is desirable that the concentric, eccentric, and inclined spinning processes are sequential spinning processes by a plurality of passes of the spinning roller in order to accurately and easily form the reduced diameter portion.

The present invention is not limited to the production of the catalytic converter as in the above-mentioned embodiment, but can be applied to all gas processing apparatuses for buffer-holding some gas processing body. For example, a diesel particulate trap filter (DPF) in an internal combustion engine, a heat recovery device, a reformer for a fuel cell or the like, various gas reformers, and the like, which widely treats gas (reaction, reforming, removal, etc.) It is applicable to the manufacture of devices. Therefore, the gas treatment body in the present invention includes not only the catalyst carrier but also those that perform the reaction, reforming and removal of the gas as described above.

[0084]

According to the present invention, the holder is wound around the outer periphery of the gas processing body, and the plate member is wound around the outer periphery of the holder to form the cylindrical body. In addition to being easily incorporated into the body, the compression amount of the holding body can be accurately determined by the winding amount of the plate material forming the cylindrical body, that is, the polymerization amount. Therefore, it is possible to easily equip the holder with a specified packing density without causing deformation or damage of the holder as in the conventional case, and the effect of the Tourniquet method can be effectively exhibited.

Further, since the diameter of the end portion of the tubular body formed by the Tourniquet method is reduced by spinning as described above, the reduced diameter portion is retained with the general portion of the tubular body, that is, the gas treatment body. The body can be easily and integrally molded with a portion in which the body is not provided, and the problems found in the conventional welded joint can be solved. Further, since the spinning process is performed, the degree of freedom of the shape of the reduced diameter portion can be expanded, and it is possible to easily cope with a large difference in diameter between the general portion and the reduced diameter portion.

Therefore, according to the present invention, Tourniquet
A method of manufacturing a gas treatment device having both the effect of the construction method and the effect of the spinning process was obtained.

Further, by forming the tab at one end of the overlapped portion of the cylindrical body, it is possible to minimize the step on the outer peripheral surface of the overlapped portion and perform the spinning process smoothly.

Further, since the outer cylinder is provided on the outer periphery of the cylindrical body and the holder is covered with the two-layer wall structure, the plate thickness per one layer can be reduced, so that the plate thickness of the cylindrical body can be reduced. Can be thinned. Therefore, even when both end portions in the winding direction of the tubular body are polymerized without providing a stepped portion, the step difference at the polymerized portion becomes small, and smooth spinning can be performed.

[Brief description of drawings]

1A to 1D are perspective views showing steps of a first embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA in FIG.

FIGS. 3A to 3F are perspective views showing the steps of the second embodiment of the present invention.

FIG. 4 is a sectional view taken along line BB in FIG.

5 is a view showing another example of the outer cylinder in the process of FIG.

FIGS. 6A to 6F are perspective views showing steps of a third embodiment of the present invention.

7 is a diagram showing another example of the outer cylinder in the process of FIG.

FIG. 8 is a side view showing a fourth embodiment of the present invention.

FIG. 9 is a side view showing a fifth embodiment of the present invention.

FIG. 10 is a perspective view illustrating a method of manufacturing a conventional catalytic converter.

FIG. 11 is a side sectional view illustrating another method of manufacturing a conventional catalytic converter.

12 is a cross-sectional view taken along the line CC in FIG.

FIG. 13 is a side sectional view for explaining still another method of manufacturing the conventional catalytic converter.

14 is a cross-sectional view taken along the line DD in FIG.

[Explanation of symbols]

1 gas processing body 2 holding body 3 plate materials 3a, 3b, 11a, 11b, 13a, 13b end part 4 in the winding direction of the plate tabs 5, 12, 12A, 14, 14A outer cylinder 5a, 5b outer cylinder end 10 spinning roller

─────────────────────────────────────────────────── ─── Continued Front Page (51) Int.Cl. ⁷ Identification FI B21D 51/18 B21D 51/18 D F01N 3/28 311U F01N 3/28 311 B01D 53/36 ZABC (72) Inventor Masashi Ohta Aichi 35 Miyoshi-cho, Nishiyoshimo-cho, Nishikamo-gun, Yamagata 5 No. 35, Mt. Hawadayama, Sango Hachiwadayama Co., Ltd. (56) JP-A-11-151535 (JP, A) JP-A-11-336537 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) B21D 22/14-24/16 B21D 41/04 B21D 51/16-51/18 B21D 53/84-53/88 B01D 53/86 B01J 35/04 F01N 3/28

Claims (6)

(57) [Claims] 1. A method of manufacturing a gas processing apparatus, wherein a gas processing body is provided inside a metal cylinder through a holding body, the method comprising the steps of winding a holding body around an outer periphery of the gas processing body. If, on the outer periphery of the wound around retention member, than the axial length of the hold member is made of metal rather long, and, at one end of the winding direction, at the time of winding
A plate having preformed tabs having steps inward is wound, and the other end of the plate in the winding direction is wound around the tab from the outside.
A second step of forming a cylinder by welding and joining the overlapped portions of the plate material in a state in which the holder is appropriately compressed by the plate material, and at least one end portion of the cylinder body is formed by spinning. A third step of reducing the diameter, and a method of manufacturing a gas treatment device, comprising: 2. After the second step, a metal plate having a length substantially the same as the axial length of the cylindrical body is wound around the outer periphery of the cylindrical body formed as described above, and both ends thereof are joined. The outer cylinder is fixed to form an outer cylinder, and then at least one end of the outer cylinder is reduced in diameter by spinning to perform the third step.
Manufacturing method of the processing apparatus 1 Symbol placement of the gas. 3. After the second step, an outer cylinder made of a metal tube having a length substantially the same as the axial length of the cylinder is externally inserted around the outer circumference of the cylinder formed as described above, the method of manufacturing the processing device according to claim 1 Symbol placement of gas reduced in diameter at least one end of the outer cylinder in spinning subjected to the third step. 4. A method of manufacturing a gas processing apparatus, wherein a gas processing body is provided inside a metal tubular body via a holding body, the method comprising the steps of winding a holding body around an outer periphery of the gas processing body. If, on the outer periphery of the wound around retention member, an axial length substantially equal length of the hold member made of metal, and, at one end of the winding direction, winding
Sometimes, a plate material having a tab having a step inwardly formed is wound, and the other end of the plate material in the winding direction is outside the tab.
The holding member by the plate members with so as to polymerize a second step of forming a polymerization unit of the weld joint to the tubular body of the sheet material in an appropriate compression state, thereafter, the outer periphery of the cylindrical body from the A metal plate member having a length longer than the axial length of the cylindrical body is wound, and both ends thereof are joined and fixed to form an outer cylinder, and then at least one end portion of the outer cylinder is reduced in diameter by a spinning process. A method for manufacturing a gas treatment device, comprising: 5. A method of manufacturing a gas processing apparatus, wherein a gas processing body is provided inside a metal tubular body via a holding body, the method comprising a first step of winding the holding body around an outer periphery of the gas processing body. If, on the outer periphery of the wound around retention member, an axial length substantially equal length of the hold member made of metal, and, at one end of the winding direction, winding
Sometimes, a plate material having a tab having a step inwardly formed is wound, and the other end of the plate material in the winding direction is outside the tab.
The holding member by the plate members with so as to polymerize a second step of forming a polymerization unit of the weld joint to the tubular body of the sheet material in an appropriate compression state, thereafter, the outer periphery of the cylindrical body from the A third step of externally inserting an outer cylinder made of a metal tube longer than the axial length of the cylindrical body, and then reducing the diameter of at least one end of the outer cylinder by spinning. Method for manufacturing gas treatment device. 6. The diameter reducing process using the spinning roller is performed such that the center axis of the diameter reducing portion is concentric, eccentric or inclined with respect to the center axis of the cylindrical body. 6. The method for manufacturing the gas processing device according to any one of 1 to 5 .