EP0336002B1 - Knit wire mesh and its production process, and device for carrying out the process - Google Patents
Knit wire mesh and its production process, and device for carrying out the process Download PDFInfo
- Publication number
- EP0336002B1 EP0336002B1 EP88105906A EP88105906A EP0336002B1 EP 0336002 B1 EP0336002 B1 EP 0336002B1 EP 88105906 A EP88105906 A EP 88105906A EP 88105906 A EP88105906 A EP 88105906A EP 0336002 B1 EP0336002 B1 EP 0336002B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- wire mesh
- monolith
- process according
- sheath
- mesh
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
- F01N3/2839—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration
- F01N3/2853—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration using mats or gaskets between catalyst body and housing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
- F01N13/0097—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series the purifying devices are arranged in a single housing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
- F01N3/2839—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration
- F01N3/2853—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration using mats or gaskets between catalyst body and housing
- F01N3/2867—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration using mats or gaskets between catalyst body and housing the mats or gaskets being placed at the front or end face of catalyst body
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2350/00—Arrangements for fitting catalyst support or particle filter element in the housing
- F01N2350/02—Fitting ceramic monoliths in a metallic housing
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49398—Muffler, manifold or exhaust pipe making
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49801—Shaping fiber or fibered material
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49813—Shaping mating parts for reassembly in different positions
Definitions
- the invention relates to a sleeve made of wire, a method for its production and a device for carrying out the method.
- Catalytic coated, preferably cylindrical, ceramic monoliths are used for exhaust gas detoxification from internal combustion engines. These monoliths are permanently stored in a housing, with the interposition of a cover, usually made of wire mesh.
- the monolith is first provided with the shell, then these two parts are inserted loosely into the two-part housing and this is pressed when it is closed. Attempts were first made to stop the axial movement of the monolith resulting from the pulsating exhaust gas flow via radial forces in the form of pressed-in beads, but this has not proven successful. Excessively high pressures applied during manufacture involve the risk of damaging the ceramic monolith. If the pressures are too low, there is a risk of insufficient holding force.
- a disadvantage of the known casings is that due to the forces acting on the monolith - both when pressing in Monolith and casing in the housing as well as in operation due to the pulsating gas flow, as occurs in exhaust gases from internal combustion engines - the monolith is brought into contact with the housing and is thereby damaged.
- the multiple wrapping of the monolith has the disadvantage that a high surface pressure occurs at the edge of the monolith due to the many layers and this can therefore be damaged.
- a generic cover according to the preamble of the main claim is also known (EP-A1 0 250 384).
- This sheath consists of pre-tensioned, flat rolled wire from a high-alloy steel and is placed over the surface of the monolith. Two beads surround the edge areas of the entry and exit sides of the monoliths used.
- the invention is based on the object of proposing a casing, a method for its production and an apparatus for carrying out the method, with which a maximum degree of safety can be achieved for the monolith in the production of the catalyst and in its operation.
- the flat wire mesh preferably in the form of a tube, which is provided with oblique embossments, is wound onto a surface adapted to the jacket of the monolith, preferably a mandrel which corresponds in shape and dimension to the monolith.
- the preload between the monolith and the metal housing can be adjusted with the depth or the height of the impressions.
- the wire mesh can also be wound directly onto the monolith and pressed there in the longitudinal direction, if an abutment that can be removed afterwards is only placed on the edges of the end faces when pressing, in order to absorb the pressing forces, so that damage to the monolith is not is to be feared. Because of the knitted wire knitting before winding with an acute angle to the circumferential winding direction cause a certain axial deflection after pressing, so that despite the abutment the compressed bead comes to rest against the end faces of the monolith.
- the wire mesh slightly apart in the axial direction before pressing the bead in order to achieve a firm fit of the bead by deflecting the shaped casing after the pressing process of the bead.
- the surface is longitudinal the edges of its end face has a circumferential projection, which is correspondingly formed as an indentation on the bead to be pressed, so there is the additional advantage that the particularly sensitive edges of the ceramic monolith do not lie directly on the shell, but in the through the projection generated indentation.
- Fig. 1 the device is shown. It has a mandrel 10, the shell 11 of which forms the surface 11 in shape and extent corresponds to the monolith 20 (FIGS. 3 and 4).
- the wire mesh 21 is preferably wound twice around the surface 11 of the mandrel 10 in the circumferential direction. The width of the wire mesh is dimensioned such that there is an overhang 18 for the wire mesh 21.
- the mandrel is located in two axially open mold jaws 12, 13 that are movable towards one another and radially surround the mandrel with play. Through the two axial openings of the mold jaws 12, 13, sliding sleeves 14 penetrate as actual pressing tools, which are axially displaceable.
- the mandrel 10 has two terminal fixed first shoulders 15 of smaller diameter in the region of the protrusion 18 of the wire mesh over the surface 11 of the mandrel 10.
- the first paragraphs 15 have further second paragraphs 16 with a smaller diameter than the guide for the sliding sleeves 14.
- the actual projecting pressed parts of the sliding sleeve 14 rest on the surfaces of the shoulders 15 and have projecting shoulders 14a on their front side, which in the end position are at a distance from the annular end face.
- the shaped jaws 12, 13 also have a ring 25 of larger diameter located in the area of the surface 11 of the mandrel 10, so that the knitted wire 21 is not compressed too much in this area when the shaped jaws 12, 13 are closed in the direction of arrow A (FIG. 2).
- This annular space 25 is followed by a circumferential circumferential clamping projection 26 for holding the wire mesh 21 while the overhang 18 is pressed together when the sliding sleeves 14 move together in the direction of arrow B.
- the circumferential clamping projection 26 has an undercut 27 in the region of the - circumferential - edges 28 of the surface 11 with the annular end face 19. The undercut 27 goes into an area 29 of the pressing tools 12, 13 with a smaller diameter than the area of the annular space 25 about.
- This device produces a inherently dimensionally shaped and provided with a bead 24 shaped sleeve 22 as shown in FIG. 3, which can jump over the circumferential edge of each end face of the monolith 20 somewhat radially inward when it is pushed over the monolith, as that is shown in Fig. 3.
- the components prefabricated in this way are then inserted into the two-part housing 23 (FIG. 4) and, when they are connected, are permanently and reliably secured against damage as a result of axial displacements of the monolith 20 in the pulsating gas stream.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Exhaust Gas After Treatment (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
Description
Die Erfindung betrifft eine Hülle aus Draht, ein Verfahren zu deren Herstellung sowie eine Vorrichtung zur Durchführung des Verfahrens.The invention relates to a sleeve made of wire, a method for its production and a device for carrying out the method.
Zur Abgasentgiftung von Verbrennungsmotoren dienen katalytisch beschichtete, vorzugsweise zylindrische Monolithen aus Keramik. Diese Monolithen werden fest in einem Gehäuse gelagert, und zwar unter Zwischenlage einer Hülle, üblicherweise aus Drahtgestrick.Catalytic coated, preferably cylindrical, ceramic monoliths are used for exhaust gas detoxification from internal combustion engines. These monoliths are permanently stored in a housing, with the interposition of a cover, usually made of wire mesh.
Bei den bekannten Verfahren wird zunächst der Monolith mit der Hülle versehen, dann werden diese beiden Teile lose in das zweiteilige Gehäuse eingesetzt und dieses wird beim Schließen verpreßt. Es wurde zunächst versucht, die infolge des pulsierenden Abgasstromes entstehende Axialbewegung des Monolithen über Radialkräfte in Form von eingepreßten Sicken zu stoppen, was sich aber nicht bewährt hat. Zu große, beim Herstellen aufgebrachte Drücke bergen nämlich die Gefahr der Beschädigung des aus Keramik bestehenden Monolithen. Bei zu geringen Drücken besteht die Gefahr einer zu geringen Haltekraft.In the known methods, the monolith is first provided with the shell, then these two parts are inserted loosely into the two-part housing and this is pressed when it is closed. Attempts were first made to stop the axial movement of the monolith resulting from the pulsating exhaust gas flow via radial forces in the form of pressed-in beads, but this has not proven successful. Excessively high pressures applied during manufacture involve the risk of damaging the ceramic monolith. If the pressures are too low, there is a risk of insufficient holding force.
Es ist daher auch schon vorgeschlagen worden, die Ränder der Stirnseite umgreifende besonderte Bauteile in Form eines Ringes einzusetzen (DE-OS 24 12 863). Es ist auch schon vorgeschlagen worden, im Bereich der Stirnseite eine mehrfach umgelegte und dadurch verstärkte Hülle zum Auffangen der Axialkräfte des Monolithen einzusetzen (DE-OS 35 19 965).It has therefore already been proposed to use special components encompassing the edges of the end face in the form of a ring (DE-OS 24 12 863). It has also been proposed to use a multiply folded and thus reinforced sheath in the area of the end face to absorb the axial forces of the monolith (DE-OS 35 19 965).
Von Nachteil bei den bekannten Hüllen ist, daß durch die auf den Monolith wirkenden Kräfte - und zwar sowohl die beim Einpressen von Monolith und Hülle in das Gehäuse als auch die im Betrieb durch die pulsierende Gasströmung, wie sie bei Abgasen von Verbrennungsmotoren auftritt - der Monolith in Berührung mit dem Gehäuse gebracht wird und dadurch beschädigt wird. Außerdem hat das mehrfache Umwickeln des Monolithen den Nachteil, daß am Rand des Monolithen durch die vielen Lagen eine hohe Flächenpressung auftritt und dieser somit geschädigt werden kann.A disadvantage of the known casings is that due to the forces acting on the monolith - both when pressing in Monolith and casing in the housing as well as in operation due to the pulsating gas flow, as occurs in exhaust gases from internal combustion engines - the monolith is brought into contact with the housing and is thereby damaged. In addition, the multiple wrapping of the monolith has the disadvantage that a high surface pressure occurs at the edge of the monolith due to the many layers and this can therefore be damaged.
Es ist ferner eine gattungsgemäße Hülle gemäß dem Oberbegriff des Hauptanspruchs bekannt (EP-A1 0 250 384). Diese Hülle besteht aus unter Vorspannung gezogenem, flach gerollten Draht eines hochlegierten Stahls und wird über die Oberfläche des Monolithen gestülpt. Zwei Wulste umgreifen die Randbereiche der Eintritts- und Austrittsseite der eingesetzten Monolithe.A generic cover according to the preamble of the main claim is also known (EP-A1 0 250 384). This sheath consists of pre-tensioned, flat rolled wire from a high-alloy steel and is placed over the surface of the monolith. Two beads surround the edge areas of the entry and exit sides of the monoliths used.
Aber auch diese bekannte Hülle ist nicht dazu geeignet, Beschädigungen des Monolithen bei der Montage oder während des Betriebs hinreichend zulässig auszuschließen.However, even this known casing is not suitable for ruling out damage to the monolith during assembly or during operation that is sufficiently permissible.
Der Erfindung liegt die Aufgabe zugrunde, eine Hülle, ein Verfahren zu deren Herstellung sowie eine Vorrichtung zur Durchführung des Verfahrens vorzuschlagen, mit denen ein Höchstmaß an Sicherheit für den Monolithen bei der Herstellung des Katalysators als auch in dessen Betrieb erzielbar ist.The invention is based on the object of proposing a casing, a method for its production and an apparatus for carrying out the method, with which a maximum degree of safety can be achieved for the monolith in the production of the catalyst and in its operation.
Diese Aufgabe wird durch den Gegenstand des Sach-, Verfahrens- und Hauptanspruchs gelöst.This object is achieved by the subject matter, method and main claim.
Es wird also erfindungsgemäß das ebene Drahtgestrick, vorzugsweise in Schlauchform, welches mit schräglaufenden Einprägungen versehen ist, auf eine dem Mantel des Monolithen angepaßte Oberfläche, vorzugsweise einen Dorn, der in Form und Abmessung dem Monolithen entspricht, aufgewickelt. Mit der Tiefe bzw. der Höhe der Einprägungen kann die Vorspannung zwischen dem Monolithen und dem Metallgehäuse eingestellt werden. Beim Pressen des über den Dorn überstehenden Überstandes des Drahtgestricks in Axialrichtung werden aus jedem der beiden Überstände je ein Wulst erzeugt, der bezüglich des Maßes des aufzunehmenden Monolithen sowohl in Axialrichtung als auch radial nach innen vorsteht. Diese solchermaßen geformte Hülle wird dann mittels einer konischen Hülse über den Monolithen geschoben und danach wird die konische Hülse wieder entfernt, so daß der von der Hülle umgebene Monolith nunmehr in das zweiteilige Gehäuse eingesetzt und in dieser eingesetzen Lage dauerhaft sichergehalten werden kann, wobei ein definiertes Axialmaß zwischen dem Monolithen und dem Gehäuse erzielt werden kann und nicht nur die elastische Lagerung in Radialrichtung zwischen dem Gehäuse und dem Monolithen erzeugt werden kann, sondern auch die axialen Kräfte aufgenommen werden können. Durch den Wulst können sowohl die Dichte, wie auch die elastischen Eigenschaften in Axialrichtung beeinflußt werden. Infolge dessen können durch den Wulst und eine dort andere Elastizität als im übrigen geformten Gestrick die Längentoleranzen zwischen dem Gehäuse und dem Monolithen aufgefangen werden. Schließlich wird eine Abdichtung gegenüber einer unerwünschten Bypass-Strömung des Abgases erzielt. Zugleich ergibt sich eine gleichmäßige Flächenpressung in den Bereichen ohne Wulst der geformten Hülle auf den Monolithen.According to the invention, the flat wire mesh, preferably in the form of a tube, which is provided with oblique embossments, is wound onto a surface adapted to the jacket of the monolith, preferably a mandrel which corresponds in shape and dimension to the monolith. The preload between the monolith and the metal housing can be adjusted with the depth or the height of the impressions. When the protrusion of the knitted wire protruding from the mandrel in the axial direction is pressed, each of the two Overhangs each produced a bead which protrudes both in the axial direction and radially inwards with respect to the size of the monolith to be accommodated. This thus shaped sleeve is then pushed over the monolith by means of a conical sleeve and then the conical sleeve is removed again, so that the monolith surrounded by the sleeve can now be inserted into the two-part housing and permanently held in this position, with a defined one Axial dimension between the monolith and the housing can be achieved and not only the elastic bearing in the radial direction between the housing and the monolith can be generated, but also the axial forces can be absorbed. Both the density and the elastic properties in the axial direction can be influenced by the bead. As a result, the length tolerances between the housing and the monolith can be absorbed by the bead and a different elasticity than the otherwise formed knitted fabric. Finally, sealing against an undesired bypass flow of the exhaust gas is achieved. At the same time, there is a uniform surface pressure in the areas without a bulge of the molded shell on the monoliths.
In alternativer Ausführungsform des erfindungsgemäßen Verfahrens kann das Drahtgestrick auch direkt auf den Monolithen aufgewickelt und dort in Längsrichtung gepreßt werden, wenn nur beim Pressen auf die Ränder der Stirnseiten ein danach entfernbares Widerlager aufgesetzt wird, um die Preßkräfte aufzunehmen, so daß eine Beschädigung des Monolithen nicht zu befürchten ist. Denn über die das Drahtgestrick vor dem Aufwickeln mit spitzwinklig zu in Umfangsrichtung verlaufenden Wickelrichtung verlaufenden Einprägungen bewirken nach dem Pressen ein gewisses axiales Einfedern, so daß trotz der Widerlager der zusammengepreßte Wulst fest zur Anlage an den Stirnseiten des Monolithen kommt. Alternativ oder zusätzlich ist es auch möglich, vor dem Pressen des Wulstes, das Drahtgestrick in Axialrichtung etwas auseinanderzuziehen, um ein festes Anliegen des Wulstes durch Einfedern der geformten Hülle nach dem Preßvorgang des Wulstes zu erzielen. Wenn in bevorzugter Ausführungsform die Oberfläche längs den Rändern ihrer Stirnseite einen umlaufenden Vorsprung aufweist, der sich entsprechend als Eindrückung an dem zu pressenden Wulst abbildet, so ergibt sich der zusätzliche Vorteil, daß die besonders empfindlichen Ränder des Monolithen aus Keramik nicht direkt an der Hülle anliegen, sondern in der durch den Vorsprung erzeugten Eindrückung liegen.In an alternative embodiment of the method according to the invention, the wire mesh can also be wound directly onto the monolith and pressed there in the longitudinal direction, if an abutment that can be removed afterwards is only placed on the edges of the end faces when pressing, in order to absorb the pressing forces, so that damage to the monolith is not is to be feared. Because of the knitted wire knitting before winding with an acute angle to the circumferential winding direction cause a certain axial deflection after pressing, so that despite the abutment the compressed bead comes to rest against the end faces of the monolith. As an alternative or in addition, it is also possible to pull the wire mesh slightly apart in the axial direction before pressing the bead in order to achieve a firm fit of the bead by deflecting the shaped casing after the pressing process of the bead. If, in a preferred embodiment, the surface is longitudinal the edges of its end face has a circumferential projection, which is correspondingly formed as an indentation on the bead to be pressed, so there is the additional advantage that the particularly sensitive edges of the ceramic monolith do not lie directly on the shell, but in the through the projection generated indentation.
Weitere zweckmäßige Ausgestaltungen und Weiterbildungen der Erfindung sind in den Unteransprüchen gekennzeichnet.Further expedient refinements and developments of the invention are characterized in the subclaims.
Ein bevorzugtes Ausführungsbeispiel für die Vorrichtung zur Durchführung des Verfahrens und ein schematischer Verfahrensablauf sind in der Zeichnung dargestellt. In dieser zeigt:
- Figur 1
- die Vorrichtung zur Durchführung des Verfahrens, im schematischen teilweise abgebrochenen Querschnitt und der Anfangsstellung;
- Figur 2
- die Vorrichtung gemäß Fig. 1 in gleicher Darstellung und Preßendstellung;
- Figur 3
- die über einen Monolithen gestreifte geformte Hülle;
- Figur 4
- die Bauteile gemäß Fig. 3, im in das Gehäuse eingesetzten Zustand, im schematischen Halbschnitt; und
- Figur 5
- die Einzelheit 5 gemäß Fig. 2.
- Figure 1
- the device for performing the method, in schematic, partially broken cross-section and the starting position;
- Figure 2
- the device of Figure 1 in the same representation and press end position.
- Figure 3
- the molded envelope streaked over a monolith;
- Figure 4
- 3, in the state inserted into the housing, in a schematic half-section; and
- Figure 5
- detail 5 according to FIG. 2.
In Fig. 1 ist die Vorrichtung gezeigt. Sie weist einen Dorn 10 auf, dessen die Oberfläche 11 bildender Mantel in Form und Ausmaß mit dem Monolithen 20 (Fig. 3 und 4) entspricht. Auf die Oberfläche 11 des Dorns 10 wird das Drahtgestrick 21 vorzugsweise zweimal in Umfangsrichtung aufgewickelt. Die Breite des Drahtgestricks ist so bemessen, daß sich ein Überstand 18 für das Drahtgestrick 21 ergibt.In Fig. 1 the device is shown. It has a
Der Dorn befindet sich in zwei aufeinander zu beweglichen und den Dorn mit Spiel radial umgebenden, axial offenen Formbacken 12, 13. Durch die zwei Axialöffnungen der Formbacken 12, 13 greifen Schiebehülsen 14 als eigentliche Preßwerkzeuge durch, welche axial verschiebbar sind.The mandrel is located in two axially
Der Dorn 10 weist zwei endständige feste erste Absätze 15 geringeren Durchmessers im Bereich des Überstands 18 des Drahtgestricks über die Oberfläche 11 des Dorns 10 auf. Die ersten Absätze 15 weisen weitere zweite Absätze 16 mit diesen gegenüber geringerem Durchmesser als Führung für die Schiebehülsen 14 auf. Die eigentlichen vorspringenden Preßteile der Schiebehülse 14 liegen auf den Oberflächen der Absätze 15 an und weisen vorspringende Absätze 14a an ihrer Vorderseite auf, die in Endlage einen Abstand zur kreisringförmigen Stirnfläche aufweisen.The
Die Formbacken 12, 13 weisen ferner einen im Bereich der Oberfläche 11 des Dorns 10 befindlichen Ring 25 größeren Durchmessers auf, damit in diesem Bereich beim Zufahren gemäß Richtungspfeil A (Fig. 2) der Formbacken 12, 13 das Drahtgestrick 21 nicht allzusehr zusammengepreßt wird. An diesen Ringraum 25 schließt sich ein in Umfangsrichtung umlaufender Klemmvorsprung 26 zum Festhalten des Drahtgestricks 21 während des Zusammenpressens des Überstands 18 beim Zusammenfahren der Schiebehülsen 14 gemäß Richtungspfeil B an. Der in Umfangsrichtung umlaufende Klemmvorsprung 26 weist eine Hinterschneidung 27 im Bereich der - umlaufenden - Ränder 28 der Oberfläche 11 mit der kreisringförmigen Stirnfläche 19 auf. Die Hinterschneidung 27 geht in einen Bereich 29 der Preßwerkzeuge 12, 13 mit gegenüber dem Bereich des Ringraumes 25 geringeren Durchmesser über. Durch diese Vorrichtung wird ein in sich formstabil geformtes und mit einem Wulst 24 versehene geformte Hülle 22 gemäß Fig. 3 hergestellt, welches die umlaufende Kante jeder Stirnseite des Monolithen 20 etwas radial einwärts springend übergreifen kann, wenn es über den Monolith geschoben wird, wie das in Fig. 3 gezeigt ist. Die solchermaßen vorgefertigten Bauteile (geformte Hülle mit Monolith) werden dann in das zweiteilige Gehäuse 23 eingesetzt (Fig. 4) und bei deren Verbindung dauerhaft und zuverlässig gegen Beschädigungen infolge von Axialverschiebungen des Monolithen 20 im pulsierenden Gasstrom gesichert.The
Claims (25)
- A sheath (22) of wire for a preferably cylindrical monolith (20) of ceramic material which serves for internal combustion engine exhaust gas decontamination and which is catalytically coated and which at its two ends has an inlet and an outlet end for the exhaust gas and a peripheral portion, wherein the sheath (22) is of such a length in the direction of the longitudinal axis of the monolith (20) that, when the monolith is inserted, it embraces its edge regions at the inlet and outlet ends, forming a respective lip (24) thereat,
characterised in that- the sheath (22) is in the form of preshaped wire mesh (21), and- the lips (24) are pressed in such a way that they are of greater density than the remainder of the wire mesh (21), forming a firm and stable shape for the sheath (22). - A sheath according to claim 1 characterised in that the wire mesh (21) comprises a tubular mesh portion.
- A sheath (22) according to claim 1 or claim 2 characterised in that in the region of the transition to each lip (24) its inside surface has impressed portions such that the peripherally extending edge of the monolith (20) at its ends is not touched.
- A sheath (22) according to one of claims 1 to 3 characterised in that the inside surface of one or both lips (24) extends at an angle which is not equal to 90° relative to the inside surface of the sheath, corresponding to the peripheral portion of the monolith (20).
- A procecess for the production of a sheath (22) according to one of claims 1 to 4
wherein the shaped mesh serves as a sheath for a preferably cylindrical monolith (20) of ceramic material, which is catalytically coated and which can be used for internal combustion engine exhaust gas decontamination,
wherein the shaped mesh comprises wire mesh, preferably a tubular mesh portion,
wherein the wire mesh is longer in the axial direction than the length determined by the distance between the two ends of the monolith (20) and projects in the axial direction at both ends beyond the surface as projecting portions (18) and forms respective lips (24),
wherein at its two ends the monolith (20) has an inlet and an outlet end for the exhaust gas and a peripheral portion, and
wherein the monolith is intended for subsequent insertion in a housing and serves as a catalyst,
characterised in that
the wire mesh is wound in the peripheral direction on to a surface (11) which is adapted to the peripheral portion of the monolith (20),
the wire mesh (21) is secured on the surface (11) at least in the region directly adjoining the region of the projecting portion (18),
with the wire mesh (21) being otherwise held fast the projecting portion (18) is compressed in the axial direction to a predeterminable axial dimension to provide a lip (24), and
the wire mesh is shaped to provide the sheath (22) in the compression operation. - A process according to claim 5 characterised in that the wire mesh (21) is wound at least twice around the surface (11).
- A process according to one of claims 5 and 6 characterised in that prior to the winding operation the wire mesh (21) is provided with impression portions which extend at an acute angle relative to the winding direction which is in the peripheral direction.
- A process according to claim 7 characterised in that the impression portions extend at an angle of from 50 to 70° relative to the winding direction.
- A process according to claim 7 or claim 8 characterised in that the impression portions extend parallel to each other.
- A process according to one of claims 5 to 9 characterised in that the surface of a mandrel (10) is used as the surface (11).
- A process according to one of claims 5 to 10 characterised in that the wire mesh (21) is fixed in the region immediately adjoining the beginning of the projecting portion (18).
- A process according to one of claims 5 to 11 characterised in that the projecting portions (18) are of the same size.
- A process according to one of claims 5 to 12 characterised in that the respective periphery of the surface (11) is at a maximum as large as the relevant periphery of the monolith (20).
- A process according to one of claims 5 to 13 characterised in that the surface (11) is at a maximum as large as the length of the monolith (20).
- A process according to one of claims 5 to 14 characterised in that the surface (11) has a peripherally extending projection along the edges of its ends (19).
- A process according to one of claims 5 to 15 characterised in that deflection of the wire mesh (21) radially outwardly and in the axial direction in the region of the surface (11) is prevented in the compression operation in the axial direction by means of an abutment.
- A process according to one of claims 5 to 16 characterised in that in the operation of compressing the wire mesh to provide the sheath (22) in the axial direction the wire mesh is at the same time bent somewhat radially inwardly.
- A process according to one of claims 5 to 17 characterised in that the pressed wire mesh (21) is drawn over a monolith (20).
- A process according to claim 18 characterised in that the monolith (20) provided with a sheath (22) is laid into a portion of a housing and a second portion is then laid thereover and finally both portions are connected together to provide the housing (23).
- Apparatus for carrying out the process according to one of claims 5 to 19 characterised by
a mandrel (10) for receiving the wire mesh (21) on its peripheral portion which forms the surface (11), two axially open shaping jaws (12, 13) which are movable towards each other and which radially surround the mandrel with clearance for the mesh (21) and two thrust sleeves which engage through the axial openings, as actual, axially displaceable pressing tools. - Apparatus according to claim 20 characterised in that the mandrel (10) is of a cylindrical configuration with two first end portions (15) of smaller diameter for the projecting portions (18) of the wire mesh (21).
- Apparatus according to claim 21 characterised in that each portion (15) has a further portion (16) of smaller diameter as a guide for the thrust sleeve (14).
- Apparatus according to one of claims 20 to 22 characterised in that the surface (11) of the mandrel (10) has a projection along its edges which are formed by the first portion (15).
- Apparatus according to one of claims 20 to 23 characterised in that the annular end face (19) extends at an angle which is different from 90° relative to the first portion (15).
- Apparatus according to one of claims 20 to 24 characterised in that the thrust sleeve (14) has a projecting portion (14a).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT88105906T ATE77677T1 (en) | 1988-04-05 | 1988-04-13 | KNITTED WIRE, PROCESS FOR PRODUCTION THEREOF AND DEVICE FOR CARRYING OUT THE PROCESS. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3811411 | 1988-04-05 | ||
DE3811411 | 1988-04-05 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0336002A1 EP0336002A1 (en) | 1989-10-11 |
EP0336002B1 true EP0336002B1 (en) | 1992-06-24 |
Family
ID=6351411
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP88105906A Expired - Lifetime EP0336002B1 (en) | 1988-04-05 | 1988-04-13 | Knit wire mesh and its production process, and device for carrying out the process |
Country Status (5)
Country | Link |
---|---|
US (1) | US5018272A (en) |
EP (1) | EP0336002B1 (en) |
AT (1) | ATE77677T1 (en) |
DE (1) | DE3872381D1 (en) |
ES (1) | ES2033359T3 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4416055A1 (en) * | 1994-05-02 | 1995-11-09 | Leistritz Abgastech | Process for the production of catalytic converters, in particular for motor vehicles |
US6922891B1 (en) | 2000-10-30 | 2005-08-02 | Robert J. Marino, Jr. | Method of manufacturing a catalytic converter |
DE102007062659A1 (en) * | 2007-12-24 | 2009-06-25 | J. Eberspächer GmbH & Co. KG | Exhaust manifold and related manufacturing process |
DE102007062661A1 (en) * | 2007-12-24 | 2009-06-25 | J. Eberspächer GmbH & Co. KG | collector |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3303806A (en) * | 1965-05-17 | 1967-02-14 | Plastic Can Corp | Method for making metallic containers |
GB1453439A (en) * | 1973-01-13 | 1976-10-20 | Ti Silencer Services Ltd | Catalytic reactor for exhaust emission control |
DE2400443A1 (en) * | 1974-01-05 | 1975-07-10 | Erhardt Bischoff Fabrik Fuer K | Catalytic exhaust gas cleaner - has catalytic material spaced from cylindrical housing by corrugated steel packing |
US3955643A (en) * | 1974-07-03 | 1976-05-11 | Brunswick Corporation | Free flow sound attenuating device and method of making |
JPS5817335B2 (en) * | 1975-04-10 | 1983-04-06 | トヨタ自動車株式会社 | Method for manufacturing integrated catalyst component for exhaust gas purification |
JPS53141166A (en) * | 1977-05-16 | 1978-12-08 | Chuo Hatsujo Kk | Honey comb catalytic converter and assembly method therefor |
DE2935470C2 (en) * | 1979-09-01 | 1984-03-01 | Zeuna-Stärker GmbH & Co KG, 8900 Augsburg | Method for producing a gas-tight, elastic winding around the circumferential surface of a catalytic converter body of a device for the catalytic cleaning of the exhaust gases from internal combustion engines |
JPS5739054A (en) * | 1980-08-20 | 1982-03-04 | Musashi Seimitsu Kogyo Kk | Forging method for forming tooth form on outer circumference of ring-shaped blank |
JPS58179529A (en) * | 1982-04-14 | 1983-10-20 | Teruyuki Watanabe | Forging method of tubular body having h-shaped sectional form |
DE3519965C2 (en) * | 1985-06-04 | 1993-12-23 | Fa. J. Eberspächer, 7300 Esslingen | Arrangement for holding a catalyst in a housing of an exhaust system of an engine powered by liquid fuel |
JPS6244325A (en) * | 1985-08-23 | 1987-02-26 | Honda Motor Co Ltd | Mounting method and device for ring parts onto outercircumference of pillar material |
SE456104B (en) * | 1986-06-16 | 1988-09-05 | Sandvik Ab | DEVICE FOR CATALYTIC CLEANING OF GASES FROM COMBUSTION ENGINE |
-
1988
- 1988-04-13 EP EP88105906A patent/EP0336002B1/en not_active Expired - Lifetime
- 1988-04-13 ES ES198888105906T patent/ES2033359T3/en not_active Expired - Lifetime
- 1988-04-13 AT AT88105906T patent/ATE77677T1/en active
- 1988-04-13 DE DE8888105906T patent/DE3872381D1/en not_active Expired - Fee Related
-
1989
- 1989-03-29 US US07/330,607 patent/US5018272A/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
EP0336002A1 (en) | 1989-10-11 |
ES2033359T3 (en) | 1993-03-16 |
DE3872381D1 (en) | 1992-07-30 |
ATE77677T1 (en) | 1992-07-15 |
US5018272A (en) | 1991-05-28 |
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