EP0791132B1 - Process and device producing a honeycomb body, especially a catalyst substrate, with a housing - Google Patents

Description

The invention relates to a method and an apparatus for Production of a honeycomb body, in particular for cleaning exhaust gases of internal combustion engines, with one in a casing tube or Housing arranged catalyst carrier body, which a variety of an exhaust gas can flow through.

Devices for exhaust gas purification are known which have a metallic Have catalyst support body. The metallic catalyst carrier body is achieved by winding or engulfing sheet metal layers produced, wherein at least a part of the sheet metal layers is structured. Such catalyst carrier bodies are, for example, in EP 0 245 738 described.

The catalyst carrier body are in a jacket tube or housing arranged. The individual sheet layers are one below the other and with the Jacket tube z. B. connected by soldering, sintering or welding.

The device is integrated in an exhaust system. Since the two Ends of the device each connected to a pipe of the exhaust system the device will be on the exhaust gas inlet side with a diffuser and on the exhaust side with a reducer connected. The task of the diffuser is the flow cross-section for the exhaust gas from the cross section of the pipe to the cross section of the Device to expand and the reducer the flow cross section on the exit side of the device on the cross section of the subsequent pipe to reduce. The connection of the diffuser and the reducer with the device is made by welding. For this it is necessary that the dimensions of the pipe on the gas inlet and the gas outlet side as well as the contour of the casing tube inside certain tolerance limits. The jacket tube is usually about 5 to 10 mm on both ends of the catalyst carrier body. To the specified for connection to the diffuser or the reducer Achieving the geometry and dimensions of the casing tube will be Jacket tube before and / or after inserting the catalyst carrier body calibrated from the inside. So far, calibration has generally been carried out in the way that a tool that has multiple segments has, inserted into the jacket tube and the individual segments radially be spread outwards. The segments are spread over the yield point of the jacket pipe material, so that in this Area the casing tube is free of tension. Because the segments of the tool can be spread radially outwards, a precisely specified one Contour cannot be reached.

US 5,096,111 discloses a device for producing a Honeycomb body with a casing tube known, the several radially displaceable Includes segments through which the tubular casing of the honeycomb body is deformable. The individual segments are at one end connected to a carrier connected to a piston rod of a cylinder-piston unit connected is. The carrier with the segments is axially in a cylindrical body and slidable out of it. For this the cylinder-piston unit is connected to the cylindrical body. In the entry area of the cylindrical body is a conical one Section formed, which is from the entry side in the axial Direction tapered.

A large number of segments encompass the deformation of the casing tube the casing tube of the honeycomb body. Then the honeycomb body by means of the cylinder-piston unit in the cylindrical body drawn in. When pulling in the honeycomb body, this is in the conical section gradually deformed. After the deformation the honeycomb body with the segments through the cylinder-piston unit brought out of the cylindrical body. During the Axial displacement of the segments slide them on the inner surface along the cylindrical body.

From GB 2 020 190 A it is known for the deformation of the casing tube a honeycomb body to use a device that several has radially movable segments.

Devices for exhaust gas purification are also known, in which the Catalyst carrier body consists of a ceramic material. Such Catalyst carrier bodies are arranged in a two-part housing. The G 87 01 980.9 U1 describes such a housing for mounting of a monolithic ceramic body.

The half shells of the housing are made from sheet metal by deep drawing produced. For the storage of the ceramic catalyst carrier body between the outside of the support body and the housing Sheath provided for the ceramic body.

The two housing shells are then pressed together and on their Contact surfaces welded gas-tight. Corresponding manufacturing processes for a device for exhaust gas purification with metallic catalyst carrier bodies are by DE 28 56 030 C2 and EP 0117 602 B1 known.

The housing parts can be manufactured with high accuracy. In contrast the ceramic catalyst carrier body can not produce exactly enough. It is therefore necessary to close the case like this dimension that even ceramic catalyst carrier body with oversize or slight deformations can be integrated into the housing can. To prevent between the catalyst carrier body and the housing creates a gap through which the exhaust gas is not cleaned passes through, an intermediate layer, in particular a so-called Swell mat inserted. Other intermediate layers with wire mesh u. Ä. are known. These layers can also be made with a catalyst be coated.

The production of a device for exhaust gas cleaning with a ceramic The catalyst carrier body is therefore relatively complex.

The aim of the present invention is to produce a device specify a honeycomb body that is structurally simple and rationally a uniform and gentle deformation of the casing tube causes. Another object of the present invention is to provide a Specify method for manufacturing a honeycomb body, which the Manufacture of a honeycomb body is simplified and longer cycle times the manufacture of the honeycomb body allowed.

This object is achieved by a device with the feature of Claim 1 and by a method with the features of the claim 15 solved. Advantageous further developments are the subject of Subclaims.

The device according to the invention for producing a honeycomb body with a jacket tube, in particular a catalyst carrier body for Internal combustion engines are characterized in that the segments each have a wedge-shaped sliding surface in cross section. The segments are surrounded by an axially displaceable, ring-shaped Closing element which has at least one inclined surface. The inclined surface of the closing element slides at one axial displacement of the closing element, on the wedge-shaped Sliding surface of each segment, causing the axial displacement of the ring a radial displacement of the segments to the casing tube causes. The simultaneous radial movement of the segments has the consequence that all segments exert a force synchronously on the casing tube, through which the jacket tube is plastically deformed. For axial displacement an actuating device of the closing element is provided, which is connected to the closing element. That of the closing element force transmitted to the segments can be determined by the angle of the inclined Areas can be set accordingly.

The slope of the sliding surface of each segment and that on the Sloping surface attacking the sliding surface of the closing element does not have to every segment be the same. According to the area of application of the device and the deformation generated by the device can Inclination surfaces can be designed differently, which means that the casing tube viewed in the circumferential direction, different forces act can.

As a result, a uniform load on the honeycomb body can be achieved. This is particularly the case with ceramic honeycomb bodies Materials or in the case of extruded metallic honeycomb bodies of interest, because this will set an even pressure load can occur without traction or gravity affecting the body would destroy.

The segments can immediately deform the jacket tube. Here the segments also represent tool segments.

According to a further advantageous idea, it is suggested that inner To releasably connect tool segments with the segments, e.g. B. by Hang up. This further training will make the Device reached. By simply exchanging the inner ones Tool segments can have different cross sections of a casing tube generated by plastic deformation. The number of tool segments does not necessarily have to correspond to the number of segments. However, it is advantageous if the number of tool segments is equal to the number of segments.

Preferably, the inclined surface of the closing element is only partially in contact with the sliding surface so that the two surfaces face each other form a free angle. This angle is preferably 0.5 to 3 °. This ensures that the locking element is clamped does not occur with the segments.

The segments are advantageously radially inward against a spring force slidably arranged. This has the advantage that after a plastic deformation of the jacket tube and an axial Movement of the closing element into a position in which the sliding surface and the sloping surface is no longer in contact, the segments automatically move radially outward, causing this the honeycomb body release.

Preferably, at least one spring element is provided, which with each Segment is connected. The spring element is advantageously around a spring washer, which is in a on the opposite of the sliding surface Surface of each sector formed groove is.

The spring element is then loaded under pressure. Should the segments at the same time be tool parts that directly deform the jacket tube, so it is useful to cover the grooves or the spring element to arrange the outer surface of the segments, whereby the axial Extension of the segments no discontinuities in the area of the segment, which comes to rest on the casing pipe occur.

An actuating device is used to actuate the closing element provided the at least two, preferably four, rods, a plate and comprises a cylinder-piston unit. The piston rod of the cylinder-piston unit is connected to the plate. One end of everyone Rod is with the plate and the other end of each rod is with connected to the closing element. The cylinder-piston unit transmits the axial movement over the plate and the rods to the closing element. This training has the advantage that only one cylinder-piston unit must be used to generate power.

The plate is expediently guided so that a possible Misalignment of the closing element is prevented.

The segments are preferably arranged on a base plate. A base plate is provided below the base plate. Between the Base and the base plate are arranged carriers, the base plate and the base plate and the carrier a frame of the device form. The cylinder-piston unit is arranged on the base plate. The bars engaging the closing element extend through bores formed in the base plate. These through holes can also serve as guides for the bars. Optionally, the carrier form guides for the plate, which the Bearers have a dual function and additional guides of the Plate can be dispensed with.

Preferably, the base plate is coaxial with that through the segments a hole for the honeycomb body is provided, through which a stamp of an ejector in the by the Segments delimiting space can be introduced and removed. this has the advantage that the honeycomb body from the device in a simple Way can be removed. The ejection device is preferably a pneumatically or hydraulically operated cylinder-piston unit.

The ejection device can also be pivotable about an axis Be lever, the first arm of which is coupled to a rod or plate and the second arm is connected to the stamp.

According to a further inventive idea, the Training device with a frame in which an annular Chamber is formed. There is a piston in the annular chamber arranged, which is connected to rods connected to the closure element attack. The chamber is filled with a fluid that is supplied via lines a pressure storage is supplied, acted upon, whereby the relative The position of the piston is changeable. The advantage of this training can be seen in the fact that the power flow is particularly favorable. The Segments are arranged on the frame, so that the frame stressed by the axial component of the acting force on pressure becomes. Another advantage is the integration of the actuator into the frame, resulting in a very compact design becomes.

It is preferable to determine the axial position of a honeycomb body a stop is provided. The stop is preferably in the form of Lugs formed, which are provided on at least two segments.

Advantageously, the device is designed so that below the Segments a passage opening is provided through which a honeycomb body after plastic deformation from the deformation area is removable.

With the device according to the invention it is now possible, at least a partial area, preferably end area of the casing tube by radial movable segments plastically on all sides from the outside inwards into one Deform the outer contour of specified dimensions. By doing this The production of the honeycomb body is simplified since now the segments causing the plastic deformation are not of inside on the narrow remaining projection of the casing tube attack, but act on a larger end area from the outside can. The above-mentioned protrusion of the casing tube before and / or behind the catalyst carrier body can be reduced to a minimum will. The supernatant can then be measured so that only nor that for a welded connection of the jacket tube with a diffuser or a necessary reducer area becomes. All processes and devices described here apply equally for round, elliptical, oval and other cross-sectional shapes, although the main use case is currently with round cross-sectional shapes lies.

The honeycomb body becomes plastic only at one end region of the casing tube deformed, so it is for the plastic deformation of the second End range necessary, a second device for performing the Provide procedure or the jacket tube about its transverse axis by 180 ° to turn. Both solutions do not always give a satisfactory result. It is therefore proposed the plastic deformation by segments make that at both end regions of the casing tube attack.

The entire casing tube can be plastically deformed by the segments will. The jacket tube initially has a geometry that after plastic deformation to the desired geometry of the Device leads. It is not imperative here that the catalyst carrier body already firmly connected to the casing tube before the deformation is. According to this inventive idea, ceramic bodies, which are round, elliptical or oval in cross-section (race track shape) are attached in a casing tube with as a housing. By plastic deformation of the casing tube, the segments being one have the appropriate contour, a one-piece housing for the Ceramic body can be produced without the body being destroyed because the body is under pressure. Opposite a housing Half-shells can clamp the honeycomb body evenly on all sides can be achieved, causing a break in the ceramic walls themselves large clamping forces is avoided. This makes the elaborate Production of a honeycomb body with a jacket tube is very simplified. The segments can be used to clamp the jacket tube on the catalyst carrier body with corresponding elevations or recesses be trained. If you provide recesses in the segments, so these lead to external beads and thus to a higher rigidity of the casing tube, which is of particular advantage since none or only very low forces act on the body from torsion (Torsion) of the casing pipe. You can also use the jacket pipe compress in the device to create special shapes.

With the device according to the invention it is now possible, too arrange ceramic body in a one-piece jacket tube without that by the plastic deformation of the casing tube, the ceramic Honeycomb body is destroyed.

The method according to the invention for producing a honeycomb body with A jacket tube is characterized in that the honeycomb body under Maintaining its transport direction at least one calibration station passes through, in which the casing tube of the honeycomb body is deformed. The possibility is indicated by this embodiment of the method to reduce the cycle time considerably. It is no longer necessary, as is known from the prior art, the honeycomb body first of all to be brought into a calibration station and afterwards To convey the calibration backwards out of the calibration station. The continuous processing of the honeycomb body also reduces the apparatus structure required for the production of the honeycomb body, since handling devices are no longer necessary that have a honeycomb body Place in a calibration station and bring it out again.

A method is preferred in which the honeycomb body is in succession goes through several calibration stations. Preferably in each Calibration stations only a predetermined axial section of the casing tube deformed. The passage of the honeycomb through individual calibration stations, in which only predetermined axial sections of the casing tube have the advantage that the tools with which the Deformation is carried out, can be made easier. The Deformation of the casing tube can be relatively large. To wear to minimize the tools and for gentle processing of the Jacket tube is proposed in the successive jacket tube Successively deform calibration stations. The degree of deformation, i.e. the difference between the shape of the casing tube before and after the deformation based on the initial shape of the casing tube is in the same for the individual calibration stations. According to another advantageous Thoughts are suggested in the manufacture of the honeycomb body the jacket tube is different in the individual calibration stations to deform strongly. A different degree of deformation of the Jacket tube in the individual calibration stations leads to a cheaper Strain on the casing pipe, since the casing pipe material can recover between the calibration stations.

The individual calibration stations are preferably made from the honeycomb bodies go through one after the other.

According to a further advantageous idea, a method proposed, in which the honeycomb body at least after a calibration station is subjected to at least one further production step. A manufacturing step is not only to be understood as steps through which the manufacturing progress is continued, but also such Understand steps that favor the manufacturing process as such. So it can be exemplary and useful, the casing tube to be provided with a lubricant on the outside between two calibration stations, about the friction between a locking segment and the casing tube to reduce.

The honeycomb body is preferably with a jacket tube in one Calibration station deformed in which the honeycomb body with the jacket tube is arranged in a space delimited by segments. After that becomes at least one annular at least one inclined surface Closing element axially displaced, the surface on one each segment slides in wedge-shaped cross-section and the segments are moved radially to the jacket. Through the radial displacement of the segments deforms the jacket.

After the shell has been deformed, the closing element is axially in opposite direction shifted causing the segments the casing tube release. Then the honeycomb body with the casing tube be transported away. The deformation of the jacket tube through the closing process does not necessarily have to be in a single closing process respectively. It is suggested to close the segments several times and to open, whereby the jacket tube successively its predetermined shape is awarded.

If the honeycomb body is to be rotationally symmetrical, then proposed to twist the honeycomb body about its longitudinal axis in such a way that the twist angle is smaller than the arc angle of a segment. The segments exert a force on the jacket tube several times. Hereby even more even plastic deformation is achieved. If the honeycomb body passes through several calibration stations, it is from Advantage if the honeycomb body is open before entering at least one a calibration station following calibration station about its longitudinal axis is rotated, the angle of rotation being smaller than the arc angle of a segment.

The casing tube of a manufactured with the inventive device The honeycomb body retains its strength properties because of the grain is not destroyed in the material.

Fig. 1

ein erstes Ausführungsbeispiel einer Vorrichtung im Querschnitt,

Fig. 2

ein zweites Ausführungsbeispiel einer Vorrichtung im Querschnitt,

Fig. 3

eine Ansicht von unten entlang der Schnittlinie III-III,

Fig. 4

vergrößert im Ausschnitt ein Segment und ein Schließelement,

Fig. 5

schematisch einen Ausschnitt aus einer Transferstraße und

Fig. 6

ein Diagramm.

Further advantages and features of the device are explained on the basis of two preferred exemplary embodiments, without this being intended to restrict them to them. It shows:

Fig. 1

a first embodiment of a device in cross section,

Fig. 2

a second embodiment of a device in cross section,

Fig. 3

a view from below along the section line III-III,

Fig. 4

enlarges a segment and a closing element in the cutout,

Fig. 5

schematically a section of a transfer line and

Fig. 6

a diagram.

The device comprises a base plate 17 and a base plate 18. The bottom and base plates 17 and 18 are spaced apart arranged. Between the base plate 17 and the base plate 18 carriers 19 are arranged. The respective end of a carrier 19 is with the base plate 17 and the base plate 18 connected.

Several segments 5 are arranged on the base plate 18. The Segments 5 are essentially radially displaceable. Between Segments 5 and the base plate 18, a slide plate 20 is arranged, on which the segments 5 slide. The slide plate 20 may e.g. B. by a Detachable connection, in particular by a screw connection, with the Base plate 18 may be connected. The segments 5 can in the sliding plate 20 and / or the base plate 18 are guided. You can do this the segments 5 have corresponding projections which are in guide grooves intervention. In any case, it prevents a relatively large sliding surface a tilting of the segments between base plate 18 and segments 5.

Each segment 5 has a sliding surface 9 which is wedge-shaped in cross section. The segments 5 are surrounded by an annular closing element 7, which has a conical surface 8. The sliding surface 9 and the surface 8 slide accordingly when the ring is axially displaced arrows V on each other.

With a downward movement of the annular closing element 7, i. H. towards the base plate 18, the segments 5 are displaced radially inwards. With this movement they exert a force on the casing tube 2 of a honeycomb body 1 for exhaust gas purification and deform it plastic.

The annular closing element 7 has a circumferential collar 21 on, which is provided with through holes 22. To high strength to reach the annular closing element 7 are stiffening ribs 23 distributed around the circumference of the annular closing element.

Screws 24 extend through the through holes 22 are each connected to a rod 11 which extends through the base plate 18 extend substantially parallel to the longitudinal axis 25. The opposite end of each rod 11 is with a plate 12 connected. The connection can be made by screw connections 24, as shown, respectively. The plate 12 can be guided on the carriers 19. The Plate 12 has a centrally formed threaded bore 26 into which a threaded pin 27 is screwed in. The threaded pin 27 forms one end of a piston rod 28 of a cylinder-piston unit 13. Die Cylinder-piston unit 13 is fixed to the base plate 17.

2 is a second embodiment of a device for Production of a honeycomb body shown. Same parts of the device have the same reference numerals as in FIG. 1.

The device has a frame 30. An annular chamber 31 is formed in the frame 30 and forms the cylinder of a cylinder-piston unit 14.
The chamber 31 is closed by means of a closure plate 32. The closure plate 32 is screwed to the frame 30 by means of screws 33. Between the frame 30 and the closure plate 32, a sealing ring - O-ring - is arranged. A piston 35 is arranged in the chamber 31 and has an annular cross section. A radial shaft sealing ring 36, 37 is arranged between the piston 35 and the wall of the chamber 31.

With the piston 35 rods 11 are connected, with their one Attack the end of the ring 7. Each rod 11 is by means of a screw 38 connected to the piston 35. Each rod 11 is in one Slide bushing 39 slidably guided. Each slide bush is in a corresponding one Recess 40 arranged in the frame 30.

As can be seen from FIG. 2, the device has eight segments 5 on. The segments 5 have recesses lying in one plane in which a spring ring 41 or 42 is arranged.

A through opening 43 is formed below the segments 5. The through opening 43 has a cross section which is essentially the cross section of the inner contour formed by the segments corresponds. After a honeycomb body plastically through the segments has been deformed and the segments release the honeycomb body again, the honeycomb body can leave the device through the opening 43.

The closing element 7 has a conical surface. This surface 8 slides on the sliding surface 9 of the segment 5. The two surfaces 8 and 9 have different angles of inclination with respect to the longitudinal axis 25 on.

The angles of inclination are chosen so that between the two surfaces 8 and 9 an open angle a arises, which is in a range between 0.5 and 3 °. The pressure area within which the force of the Closing element is introduced to the segments 5 is in FIG. 2 shown in dashed lines.

A section of a transfer line 48 is shown schematically in FIG. The transfer line 48 comprises the calibration stations 43, 44, 46 and 47. A processing station 45 is arranged between the calibration stations 44 and 46. The transport direction of the honeycomb body is identified by T. The honeycomb bodies pass through the individual stations, calibration stations and processing stations one after the other. A calibration station comprises at least one device such as. B. is shown in Figure 2. The individual honeycomb bodies successively pass through the calibration stations 43, 44, 46 and 47, each honeycomb body passing through the individual calibration stations being deformed while maintaining its transport direction T. In the processing station 45, the honeycomb body can be subjected to further processing, processing being understood in the broadest sense. This can also be a quality control of the honeycomb body. In the individual calibration stations 43, 44, 46 and 47, the radial reduction of the jacket tube can be the same or different in terms of amount. FIG. 6 schematically shows a diagram which shows the diameter of a rotationally symmetrical honeycomb body after individual calibration stations K ₁ to K ₄ . As can be seen from the diagram, the calibration station K _{2 has} a significantly greater reduction in the diameter of the jacket tube from D ₁ to D ₂ compared to the other calibration stations K ₁ , K ₃ or K ₄ . The representation of Figure 6 is schematic in nature. How large the reduction of the jacket tube should take place within the individual calibration stations also depends on the honeycomb body and the purpose for which it is to be used.

Reference symbol list:

1

Honeycomb body

2nd

Casing pipe

3rd

Catalyst carrier body

4th

channels

5

Segments

6

Outer contour

7

Closing element

8th

conical surface

9

wedge-shaped surface

10th

Actuating means

11

pole

12th

plate

13

Cylinder-piston unit

14

Cylinder-piston unit

15

piston

16

Piston rod

17th

Base plate

18th

Base plate

19th

carrier

20th

Sliding plate

21

collar

22

Holes

23

Ribs

24th

Screws

25th

Longitudinal axis

26

Tapped hole

27

Threaded pin

28

Piston rod

30th

frame

31

chamber

32

Locking plate

33

Screws

34

Sealing ring

35

piston

36, 37

Radial shaft seal

38

screw

39

Sliding bush

40

Recess

41

Spring washer

42

Spring washer

43

Calibration station

44

Calibration station

45

Processing station

46

Calibration station

47

Calibration station

48

Transfer line

T

Direction of transport

Claims (22)

1. Apparatus for shaping a tubular casing (2) of a honeycomb body (3), which apparatus includes a plurality of radially displaceable segments (5), wherein

   the segments (5) each have a sliding surface (9) which is wedge-shaped in cross-section,

   there is provided at least one annular, axially displaceable closing element (7) which surrounds the segments (5) and which has at least one inclined surface (8),

   the inclined surface (8) slides against the sliding surfaces (9),

   there are provided actuating means which are connected to the closing element (7),

   and wherein the actuating means (31, 35) are of an annular configuration and leave free an opening (43) so that the honeycomb body (3) with tubular casing (2) can pass into the apparatus from one side and can leave it on the other side.
2. Apparatus according to claim 1 characterised in that there are provided at least four, preferably six, in particular eight, segments (5).
3. Apparatus according to claim 2 characterised in that the apparatus (1) has twelve segments (5).
4. Apparatus according to claim 1, claim 2 or claim 3 characterised in that the segments (5) directly shape the tubular casing (2).
5. Apparatus according to claim 1, claim 2 or claim 3 characterised in that the segments (5) are releasably connectable to tool segments.
6. Apparatus according to claim 5 characterised in that the number of tool segments is equal to the number of segments (5).
7. Apparatus according to one of claims 1 to 6 characterised in that the inclined surface (8) is partially in contact with the sliding surface (9), and that the two surfaces (8 and 9) form an angle of preferably from 0.5 to 3° relative to each other.
8. Apparatus according to one of claims 1 to 7 characterised in that the segments (5) are arranged radially inwardly displaceably against a spring force.
9. Apparatus according to claim 8 characterised in that there is provided at least one spring element (41, 42) which is connected to each segment (5).
10. Apparatus according to claim 9 characterised in that the spring element (41, 42) is spring ring.
11. Apparatus according to one of claims 1 to 10 characterised in that it has a frame structure (30) in which there is an annular chamber (31), and that disposed in the chamber (31) is a piston (35) connected to rods (11) which engage the closing element (7).
12. Apparatus according to one of claims 1 to 11 characterised in that there is provided an abutment which fixes the axial position of the honeycomb body between the segments.
13. Apparatus according to claim 12 characterised in that the abutment is formed by noses provided on at least two segments.
14. Apparatus according to one of claims 1 to 13 characterised in that the actuating means (31, 35) and the discharge opening (43) are arranged beneath the segments (5), wherein the cross-section of the discharge opening (43) substantially corresponds to the contour formed by the segments (5) in a radial plane.
15. A method of shaping a tubular casing (5) on a honeycomb body (3), in which the honeycomb body (3) with tubular casing (2), while maintaining its transportation direction (T) during the production procedure, passes in the transportation direction (T) through at least one calibration station (43, 44, 46, 47) which is of a tunnel-like configuration and in which the tubular casing (2) is shaped.
16. A method according to claim 15 in which the honeycomb body (3) with tubular casing (2) successively passes through a plurality of calibration stations (43, 44, 46, 47).
17. A method according to claim 16 in which only predetermined axial portions of the tubular casing (2) are shaped in the individual calibration stations (43, 44, 46, 47).
18. A method according to claim 16 in which the tubular casing (2) is successively shaped in the consecutive calibration stations (43, 44; 46, 47).
19. A method according to claim 17 or claim 18 in which the degree of shaping of the tubular casing (2) is different in the individual calibration stations (43, 44, 46, 47).
20. A method according to one or more of claims 16 to 19 in which the honeycomb body (3) with tubular casing (2) passes through the individual calibration stations (43, 44, 46, 47) in immediate succession.
21. A method according to one or more of claims 16 to 20 in which the honeycomb body (3) with tubular casing (2), at least after a calibration station (43, 44, 46, 47), is subjected to at least one further production step.
22. A method for the manufacture of a rotationally symmetrical honeycomb body according to one of claims 16 to 21 in which the honeycomb body (3) with tubular casing (2), before passing into at least one calibration station (44, 46, 47) following a calibration station (43, 44, 46) and/or between two closing operations for the segments (5), is turned about its longitudinal axis, with the angle of turning movement being smaller than the arc angle of a segment (5).

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