EP1165265B1 - Method for circularly bending a sheet and multicylinder device for carrying out the method - Google Patents

Method for circularly bending a sheet and multicylinder device for carrying out the method Download PDF

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Publication number
EP1165265B1
EP1165265B1 EP00901464A EP00901464A EP1165265B1 EP 1165265 B1 EP1165265 B1 EP 1165265B1 EP 00901464 A EP00901464 A EP 00901464A EP 00901464 A EP00901464 A EP 00901464A EP 1165265 B1 EP1165265 B1 EP 1165265B1
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European Patent Office
Prior art keywords
sheet
rounding
rounded
plate
edge
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EP00901464A
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German (de)
French (fr)
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EP1165265A1 (en
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Eugen Mueller
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Elpatronic AG
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Elpatronic AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/14—Bending sheet metal along straight lines, e.g. to form simple curves by passing between rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/14—Bending sheet metal along straight lines, e.g. to form simple curves by passing between rollers
    • B21D5/146—Bending sheet metal along straight lines, e.g. to form simple curves by passing between rollers one roll being covered with deformable material

Definitions

  • the present invention relates to a method for rounding a panel, preferably a sheet, and a two-roll rounding machine for carrying out the method.
  • a method or such a rounding machine are known, for example, from US-A-4,706,488.
  • round process sheet metal parts for the production of particular tubular bodies such as ventilation ducts or filter housings are bent round and fed to the rounding of a subsequent processing station for fixed connection of the adjacent longitudinal edges.
  • Sheets for the stated purpose can be designed differently, as for example for ventilation channels recesses for later connection of a branching pipe or filter housings an actual sieve structure is provided in the sheet, which complicates the processing and makes significant demands on the rounding process.
  • such sheets typically have a thickness of 0.3 to 3mm, the diameter after rounding is between 25 and 500mm. Thinner or even thicker sheets are also processed by round machines to form bodies with other diameters.
  • the two guide rollers were reduced in diameter, so that the distance of the axes of the guide rollers and thus the length of the poorly rounded portion could be reduced.
  • the resulting risk of deflection of the guide rollers was collected by a fourth roller, which rolls as a support roller on the opposite side of the sheet metal path on the guide rollers, this supports and thus prevents unwanted deflection.
  • This four-roll rounding machine has improved properties; the basic problem of insufficient rounding of the leading portion of a sheet is not solved.
  • the leading edge of the sheet is collected at the end of the passage through the rounding machine in a catch rail with appropriately trained grooves, as well as after completion of rounding then resiliently latching subsequent sheet edge, so that the rounded plate of the catch rail can be moved along to the subsequent processing station.
  • two-roll rotary apparatuses are known with which a sheet is rounded between a round roller and a single guide roller provided with a pressure-elastic coating.
  • Such round processes allow, in contrast to the above-mentioned three-spool or four-roll round process perfect rounding of a sheet. If, during the rounding process, the round rollers are spaced apart from each other in phases with uninterrupted feed, straight areas remain between curved points.
  • a sheet metal body can be made with a triangular profile; In the present case, such designs are referred to as tubular.
  • the rounded sheet metal parts are removed axially from the round roller and not fixed in a safety rail.
  • a tether has its place as close to the entry point as possible, but for geometric reasons, it can only lie approximately in the path of the leading edge, and not at the end, but set back. This then leads, at the end of the round process, to a widening of the just-rounded sheet, which is disadvantageous in view of the perfect rounding by the two-roll machine and depending on the subsequent application of the sheet metal body.
  • the present invention is therefore an object of the invention to provide a method and a two-roll rounding machine for bending sheet metal, which do not have the disadvantages mentioned above, ie ensures a perfect rounding quality with secure orientation of the sheet metal body for subsequent processing in a simple manner without additional processing station.
  • leading edge is understood to mean the edge detected first at the inlet and “trailing edge” the opposite edge of the sheet, corresponding to a conventional passage through a circular apparatus. This designation is - unless this is expressly mentioned - maintained, even if by inventive reversal of the feed direction, the original leading edge actually trailing. Also, regarding “feed”, the direction in which the sheet with the leading edge is detected by the entry point, while the opposite direction is referred to as "returning feed”.
  • the leading edge travels around the guide roll by one-half turn around the guide roll by a full 360 °, which is also intended to make a tubular body by 360 ° rounding and then the abutting edges connect to.
  • the leading edge is located after the rounding again immediately before the inlet of the round rollers.
  • the edges of the rounded body have a different end position: As soon as the further portion is rounded such that it runs against the first portion, the leading edge moves away from the inlet point, and runs contrary to the system on her Path backwards.
  • the complete rounding can be achieved in a general and predeterminable position of the edges. This makes it possible to position a safety catch where subsequent deformation of the flawlessly rounded sheet is omitted, with the result that the orientation of the sheet is not lost and a subsequent processing station is eliminated.
  • the entire sheet is rounded into two sections.
  • the rollers are removed from each other until the further advanced sheet metal reaches the inlet point with the following edge.
  • the rounding of the second portion of the trailing edge takes place against the first portion.
  • the rounding is complete. The center of the sheet, and no longer the leading edge, is now at the entry point, the edges of this opposite, on the other side of the round roller.
  • the effect of the above-described embodiment occurs when, after the first partial region has been created, the second partial region according to the invention is rounded. It is not essential under which feed direction, the first portion was rounded; it is conceivable to pass the sheet through the spaced rolls to the center thereof, to close the rolls and then to round the first portion from the center to the "leading edge". Then the feed direction during the rounding of the first and the second portion is the same.
  • the last rounded region is rounded such that the edge leading in this last (here: the second) rounding operatively cooperates with a device for defining the edge position upon completion of the rounding.
  • Fig. 1 shows a conventional Zweiwalzenrundapparat 1 with a round roller 2 and a guide roller 3; the guide roller has a pressure-elastic coating 4, by which a sheet 10 can be pressed against the circular roller 2, such that the sheet comes to rest on the circular roller 2 and is thereby plastically deformed.
  • the sheet 10 has a leading edge V and a trailing edge N.
  • the trailing Edge N is in the inlet 5, the leading edge V immediately before it; the rounding process is completed.
  • the direction of rotation of the rollers 2, 3 with feed of the sheet 10 are marked by the arrows shown.
  • feed refers to the direction of transport of the sheet 10 from left to right through the round apparatus 1 through and "returning feed” the opposite direction.
  • the sheet 10 has curved portions 11 (shown in bold) and straight portions 12 (shown by a double line). Curved areas are created by compressed rollers 2,3 and straight areas by spaced rollers 2,3 during feed.
  • Fig. 2 shows a sheet 10 before rounding with recesses 15 for a future branch pipe, a filter structure 16 and other recesses 17.
  • Such a sheet is difficult to round and lead, as the various structures represent weakenings or stiffening, which as irregularities the Processing.
  • FIG. 3a to 3d shows an exemplary embodiment of the rounding process according to the invention:
  • the sheet metal 10 is positioned with its leading edge V in front of the inlet point 5.
  • a first (shown in bold in the figure) portion 20 of the sheet 10 is already rounded, while a second (shown in the figure by double lines) portion 21 the round apparatus 1 has not yet happened.
  • the first portion 20 extends over half the sheet length, so that the curvature obtained corresponds to a semicircle.
  • FIG. 3 c shows that the feed has been continued until the trailing edge N has reached the inlet point 5.
  • a curvature of the second time range 21 is omitted, since the rollers have been kept 2.3 during the feed at a distance.
  • Fig. 3d shows the sheet 10 after completed rounding process.
  • the second portion 21 has been rounded under retrograde feed from the trailing edge N ago.
  • the rounding in the second partial region has begun at the edge N and has developed towards the first partial region 20 until the second partial region has been completely rounded.
  • Figs. 3a to 3d is schematically illustrated means 30 for defining the edge position of the edges V and N.
  • the means 30 holds the position of the edges V and N when the sheet 10 for further processing e.g. is withdrawn axially from the round apparatus 1. Due to the fact that the edges V and N are not located at the inlet point 5 after rounding, the device 30 can be arranged in the path of the edges V and N, so that a deformation of the rounded sheet 10 is omitted.
  • the device 30 may be located anywhere on the path of the edges V and N; the possibilities are limited only by the space requirement of the device 30 in view of the proximity to the inlet point 5. Likewise, the device 30 may be equipped with not shown in the figures guide grooves for the edges V and N or other guide means.
  • the sheet 10 has been rounded into the device 30, wherein the curves of the second portion 21 has ended as soon as the actually leading edge of the portion 21 cooperated with the means 30 in an operative manner.
  • FIGS. 4a to 4c show a further embodiment of the method according to the invention.
  • Fig. 4a is shown how the sheet 10 by half the round apparatus 1 has been advanced; with spaced rollers 2,3, since a rounding has not occurred.
  • a first portion 25 is in a rounding, which develops from the center of the sheet to the leading edge V out. After completion of the rounding of the first portion 25, the leading edge V is in the inlet 5. A second portion 26 of the sheet 10 remains untouched.
  • the sheet 10 is pulled through the round apparatus with feed until the trailing edge N has reached the inlet point 5.
  • the second portion 26 passes through the rollers 2,3 in a spaced position.
  • FIG. 4c shows how the second partial region 26 is rounded, starting from the trailing edge N toward the beginning 27 of the first partial region 25. After completion of the rounding, the situation corresponds to Fig. 3d.
  • the second (and last) portion 26 has been rounded until the actually leading edge during these rounds cooperates with the means 30.
  • the invention extends over sheet metal, in particular with the masses mentioned in the introduction, to any metallic or non-metallic, plastically deformable material whose rounding is the object of the present invention.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Wire Processing (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)

Abstract

According to the present invention, a method and an apparatus for rounding a sheet or plate blank in a rounding apparatus having rounding rolls is provided. A predetermined second part region of the blank is rounded after a predetermined first part region has been rounded. A feed direction of the blank for the rounding of the second part region is selected such that rounding in the second part region proceeds towards the previously rounded first part region.

Description

Die vorliegende Erfindung betrifft ein Verfahren zum Runden einer Tafel, vorzugsweise eines Blechs sowie eine Zweiwalzen-Rundmaschine zur Durchführung des Verfahrens.
Ein Verfahren bzw, eine derartige Rundmachine sind z.B.aus der US-A-4 706 488 bekannt.
Mit Rundverfahren werden Blechteile zur Herstellung von insbesondere rohrförmigen Körpern wie Lüftungskanälen oder Filtergehäusen rundgebogen und nach der Rundung einer nachfolgenden Verarbeitungsstation zur festen Verbindung der nebeneinander liegenden Längskanten zugeführt. Bleche für den genannten Zweck können verschieden ausgebildet sein, da z.B. für Lüftungskanäle Aussparungen für den späteren Anschluss eines verzweigenden Rohrs oder bei Filtergehäusen eine eigentliche Siebstruktur im Blech vorgesehen wird, was die Verarbeitung erschwert und erhebliche Anforderungen an den Rundvorgang stellt.The present invention relates to a method for rounding a panel, preferably a sheet, and a two-roll rounding machine for carrying out the method.
A method or such a rounding machine are known, for example, from US-A-4,706,488.
With round process sheet metal parts for the production of particular tubular bodies such as ventilation ducts or filter housings are bent round and fed to the rounding of a subsequent processing station for fixed connection of the adjacent longitudinal edges. Sheets for the stated purpose can be designed differently, as for example for ventilation channels recesses for later connection of a branching pipe or filter housings an actual sieve structure is provided in the sheet, which complicates the processing and makes significant demands on the rounding process.

Typischerweise besitzen solche Bleche eine Dicke von 0,3 bis 3mm, der Durchmesser nach Rundung liegt zwischen 25 und 500mm. Dünnere oder noch dickere Bleche werden aber ebenfalls durch Rundmaschinen zu Körpern mit andern Durchmessern verarbeitet.Typically, such sheets have a thickness of 0.3 to 3mm, the diameter after rounding is between 25 and 500mm. Thinner or even thicker sheets are also processed by round machines to form bodies with other diameters.

Für die Rundung von Blechen der genannten Art finden beispielsweise Dreiwalzen-Rundmaschinen Verwendung, mit denen Bleche um eine Rundwalze gebogen werden, indem zwei voneinander beabstandete, aber mit der Rundwalze zusammenwirkende Führungswalzen die Bleche während dem Durchlauf an einen Abschnitt der Rundwalze andrücken und so eine plastische Verformung erzeugen. Es zeigt sich, dass bei einer Dreiwalzen-Rundmaschine das gerundete Blech z. B. im Bereich der vorlaufenden Kante ungenügend gerundet ist, da beim Einführen des Blechs dieses zunächst nur zwischen der Rundbiegewalze und der ersten Führungswalze erfasst und nicht oder nicht genügend gerundet wird, bis die vorlaufende Kante die zweite Führungswalze erreicht und damit der plastische Verformungsprozess einsetzt. Die ist insbesondere bei Blechen kritisch, welche bei der vorlaufenden Kante eine grössere Ausnehmung aufweisen, so dass die seitlich benachbarten Bereiche dann überbeansprucht werden und zur Knickung neigen.For the rounding of sheets of the type mentioned, for example, three-roll cylindrical machines are used with which sheets are bent around a round roller by two spaced apart, but cooperating with the round roller guide rollers press the sheets during the passage to a portion of the round roller and so a plastic Create deformation. It turns out that in a three-roll rounding machine, the rounded sheet z. B. is inadequately rounded in the leading edge, as detected during insertion of the sheet this initially only between the Rundbiegewalze and the first guide roller and not rounded or not enough until the leading edge reaches the second guide roller and thus the plastic deformation process starts. This is particularly critical for sheets, which have a larger recess at the leading edge, so that the laterally adjacent areas are then overstressed and tend to buckling.

Entsprechend wurden die beiden Führungswalzen in ihrem Durchmesser reduziert, so dass der Abstand der Achsen der Führungswalzen und damit die Länge des mangelhaft gerundeten Bereichs verringert werden konnte. Die damit entstandene Gefahr der Durchbiegung der Führungswalzen wurde durch eine vierte Walze aufgefangen, welche als Stützwalze auf der dem Blechpfad gegenüberliegenden Seite auf den Führungswalzen abwälzt, diese stützt und so eine unerwünschte Durchbiegung verhindert. Diese Vierwalzenrundmaschine besitzt verbesserte Eigenschaften; das Grundproblem der ungenügenden Rundung des vorlaufenden Abschnitts eines Blechs ist aber nicht gelöst.Accordingly, the two guide rollers were reduced in diameter, so that the distance of the axes of the guide rollers and thus the length of the poorly rounded portion could be reduced. The resulting risk of deflection of the guide rollers was collected by a fourth roller, which rolls as a support roller on the opposite side of the sheet metal path on the guide rollers, this supports and thus prevents unwanted deflection. This four-roll rounding machine has improved properties; the basic problem of insufficient rounding of the leading portion of a sheet is not solved.

Die vorlaufende Blechkante wird am Schluss des Durchgangs durch die Rundmaschine in einer Fangschiene mit entsprechend ausgebildete Nuten aufgefangen, ebenso wie nach beendeter Rundung die dann federnd einrastende nachfolgende Blechkante, so dass das gerundete Blech der Fangschiene entlang zur nachfolgenden Bearbeitungsstation verschoben werden kann.The leading edge of the sheet is collected at the end of the passage through the rounding machine in a catch rail with appropriately trained grooves, as well as after completion of rounding then resiliently latching subsequent sheet edge, so that the rounded plate of the catch rail can be moved along to the subsequent processing station.

Des weiteren sind Zweiwalzen-Rundapparate bekannt, mit denen ein Blech zwischen einer Rundwalze und einer einzigen mit einer druckelastischen Beschichtung versehenen Führungswalze gerundet wird. Derartige Rundverfahren erlauben im Gegensatz zum oben erwähnten Dreiwatzen-oder Vierwalzen Rundverfahren eine einwandfreie Rundung eines Blechs. Werden während dem Rundvorgang die Rundwalzen bei ununterbrochenem Vorschub voneinander phasenweise beabstandet, verbleiben zwischen gekrümmten Stellen gerade Bereiche. Z.B. kann so ein Blechkörper mit Dreieckprofil hergestellt werden; vorliegend werden solche Ausführungen sinngemäss als rohrförmig bezeichnet.Furthermore, two-roll rotary apparatuses are known with which a sheet is rounded between a round roller and a single guide roller provided with a pressure-elastic coating. Such round processes allow, in contrast to the above-mentioned three-spool or four-roll round process perfect rounding of a sheet. If, during the rounding process, the round rollers are spaced apart from each other in phases with uninterrupted feed, straight areas remain between curved points. For example, such a sheet metal body can be made with a triangular profile; In the present case, such designs are referred to as tubular.

Nach beendeter Rundung befindet sich die vorlaufende Kante wieder unmittelbar vor der Einlaufstelle in die Rundwalzen.After completion of rounding, the leading edge is again immediately in front of the inlet point into the round rollers.

Um eine vollständige und damit qualitativ hochwertige Rundung zu erhalten, werden die gerundeten Blechteile axial von der Rundwalze abgenommen und nicht in einer Fangschiene fixiert. Natürlich hat eine Fangschiene ihren Platz so nahe bei der Einlaufstelle wie möglich, sie kann aber aus geometrischen Gründen nur ungefähr im Pfad der vorlaufenden Kante liegen, und nicht an dessen Ende, sondern zurückversetzt. Dies führt dann, am Ende des Rundvorgangs, zu einer Aufweitung des soeben gerundeteten Blechs, was angesichts der einwandfreien Rundung durch die Zweiwalzenmaschine und je nach späteren Anwendung des Blechkörpers nachteilig ist.To obtain a complete and thus high-quality rounding, the rounded sheet metal parts are removed axially from the round roller and not fixed in a safety rail. Of course, a tether has its place as close to the entry point as possible, but for geometric reasons, it can only lie approximately in the path of the leading edge, and not at the end, but set back. This then leads, at the end of the round process, to a widening of the just-rounded sheet, which is disadvantageous in view of the perfect rounding by the two-roll machine and depending on the subsequent application of the sheet metal body.

Beim axialen Abzug des gerundeten Blechs geht aber im Gegensatz zur Fangschiene, welche zugleich als Führungsschiene für den Weitertransport des Blechs dient, die Orientierung des Blechkörpers, d.h. die Lage der nachfolgend zu verbindenden Kanten, verloren. In der Regel besitzt deshalb eine Zweiwalzen-Rundmaschine eine nachgeschaltete Arbeitsstation, welche die Orientierung wieder herstellt, damit die Blechkörper in einer Transportschiene anordnet werden können. Weiter besteht beim axialen Abzug, insbesondere bei dicken Blechen die Gefahr, dass die vergleichsweise weiche und damit verletzbare druckelastische Beschichtung der Rundwalze beschädigt wird. Es erweist sich, dass diese bekannten Zweiwalzen-Vorrichtungen technisch aufwendig und überdies kostenintensiv sind.When axial withdrawal of the rounded sheet but in contrast to the trailing rail, which also serves as a guide rail for the further transport of the sheet, the orientation of the sheet metal body, i. the location of the edges to be subsequently connected, lost. In general, therefore, a two-roll rotary machine has a downstream workstation, which restores the orientation so that the sheet metal body can be arranged in a transport rail. Next, there is the risk that the comparatively soft and thus vulnerable pressure-elastic coating of the round roller is damaged in the axial deduction, especially in thick sheets. It turns out that these known two-roll devices are technically complex and, moreover, expensive.

Der vorliegenden Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren und eine Zweiwalzen-Rundmaschine zum Rundbiegen von Blechen anzugeben, das die vorstehend genannten Nachteile nicht aufweisen, d.h. eine einwandfreie Rundungsqualität bei gesicherter Orientierung des Blechkörpers für nachfolgende Verarbeitung auf einfache Weise ohne zusätzliche Verarbeitungsstation sicherstellt.The present invention is therefore an object of the invention to provide a method and a two-roll rounding machine for bending sheet metal, which do not have the disadvantages mentioned above, ie ensures a perfect rounding quality with secure orientation of the sheet metal body for subsequent processing in a simple manner without additional processing station.

Diese Aufgabe wird durch die in Anspruch 1 bzw. in Anspruch 7 angegebenen Merkmale gelöst. Vorteilhafte Ausführungsformen der Erfindung sind in der abhängigen Ansprüchen angegeben.This object is achieved by the features specified in claim 1 and in claim 7. Advantageous embodiments of the invention are indicated in the dependent claims.

Zum Zweck der Beschreibung der Erfindung wird, sofern dies nicht ausdrücklich anders erwähnt ist, unter "vorlaufender Kante" die beim Einlauf zuerst erfasste Kante und unter "nachlaufender Kante" die gegenüber liegende Kante des Blechs verstanden, entsprechend einem konventionellen Durchlauf durch einen Rundapparat. Diese Bezeichnung wird - es sei denn, dies wird ausdrücklich erwähnt - beibehalten, auch wenn durch erfindungsgemässe Umkehrung der Vorschubrichtung die ursprünglich vorlaufende Kante tatsächlich nachläuft. Ebenso betreffend "Vorschub", der Richtung, in welcher das Blech mit der vorlaufenden Kante durch die Einlaufstelle erfasst wird, während die Gegenrichtung als "rücklaufender Vorschub" bezeichnet wird.For the purpose of describing the invention, unless explicitly stated otherwise, "leading edge" is understood to mean the edge detected first at the inlet and "trailing edge" the opposite edge of the sheet, corresponding to a conventional passage through a circular apparatus. This designation is - unless this is expressly mentioned - maintained, even if by inventive reversal of the feed direction, the original leading edge actually trailing. Also, regarding "feed", the direction in which the sheet with the leading edge is detected by the entry point, while the opposite direction is referred to as "returning feed".

Dadurch, dass gemäss Anspruch 1 Teilbereiche des Blechs nacheinander in bestimmter Weise, nämlich gegeneinanderlaufend gerundet werden, ist die Endlage der Kanten eine andere, als bei den konventionellen Verfahren, die Endlage liegt nicht in der Einlaufstelle, sondern am beliebigen, gewünschten Ori im Rundungspfad.Characterized in that according to claim 1 portions of the sheet are successively rounded in a certain way, namely gegeneinanderlaufend, the end position of the edges is a different, as in the conventional method, the final position is not in the inlet point, but at any desired Ori in the rounding path.

Bei konventionellen Verfahren läuft die vorlaufende Kante, wie erwähnt, aufgrund der in einer Vorschubrichtung erfolgenden Rundung um die Führungswalze herum, und zwar um volle 360°, was auch der Absicht entspricht, einen rohrförmigen Körper durch eine 360° Rundung herzustellen und dann die aneinanderliegenden Kanten zu verbinden. Die vorlaufende Kante befindet sich nach der Rundung wieder unmittelbar vor dem Einlauf der Rundwalzen.In conventional methods, as mentioned, the leading edge travels around the guide roll by one-half turn around the guide roll by a full 360 °, which is also intended to make a tubular body by 360 ° rounding and then the abutting edges connect to. The leading edge is located after the rounding again immediately before the inlet of the round rollers.

In Anwendung des erfindungsgemässen Verfahrens besitzen die Kanten des gerundeten Körpers, wie erwähnt, eine andere Endlage: Sobald der weitere Teilbereich derart gerundet wird, dass dieser gegen den ersten Teilbereich läuft, entfernt sich die vorlaufende Kante wieder von der Einlaufstelle, und läuft systemwidrig auf ihrem Pfad rückwärts. Die vollständige Rundung kann in allgemeiner und vorbestimmbarer Lage der Kanten erzielt werden. Dadurch ist es möglich, eine Fangschiene dort zu positionieren, wo eine nachträgliche Verformung des einwandfrei gerundeten Blechs unterbleibt, mit der Folge, dass die Orientierung des Blechs nicht verloren geht und eine nachfolgende Verarbeitungsstation entfällt.In application of the inventive method, the edges of the rounded body, as mentioned, have a different end position: As soon as the further portion is rounded such that it runs against the first portion, the leading edge moves away from the inlet point, and runs contrary to the system on her Path backwards. The complete rounding can be achieved in a general and predeterminable position of the edges. This makes it possible to position a safety catch where subsequent deformation of the flawlessly rounded sheet is omitted, with the result that the orientation of the sheet is not lost and a subsequent processing station is eliminated.

Dadurch, dass die Rundung des letzten zu rundenden Bereichs derart vorgenommen wird, dass die dann während dieser letzten Rundung vorlaufende Kante am Ende des Rundvorgangs betriebsfähig mit der Einrichtung (30) zusammenwirkt, wird erreicht, dass das Blech in eine mechanisch definierte Ausstossposition hinein gerundet worden ist, somit in gesicherter Orientierung vorliegt und lagedefiniert aus dem Rundapparat entnommen werden kann, ohne dass es zur Lagedefinition einer nachgeschalteten Vorrichtung bedarf.By virtue of the fact that the rounding of the last region to be rounded is carried out in such a way that the edge leading during this final rounding cooperates with the device (30) at the end of the rounding operation, it is achieved that the metal sheet has been rounded into a mechanically defined ejection position is, therefore, in a secure orientation and can be removed from the position defined by the round apparatus, without the need for the position of a downstream downstream device.

Bei einer bevorzugten Ausführungsform nach Anspruch 3 wird das gesamte Blech in zwei Teilbereichen gerundet. Im ersten Teilbereich erfolgt die Rundung von der vorlaufenden Kante bis zur Blechmitte; dann werden die Walzen solange voneinander entfernt, bis das weiter vorgeschobene Blech mit der nachfolgenden Kante die Einlaufstelle erreicht. Unter rücklaufendem Vorschub erfolgt dann die Rundung des zweiten Teilbereichs von der nachlaufenden Kante gegen den ersten Teilbereich hin. Sobald die Blechmitte wieder erreicht ist, ist die Rundung vollständig. Die Blechmitte, und nicht mehr die vorlaufende Kante, liegt nun bei der Einlaufstelle, die Kanten dieser gegenüber, auf der andern Seite der Rundwalze.In a preferred embodiment according to claim 3, the entire sheet is rounded into two sections. In the first part of the rounding is done from the leading edge to the middle of the sheet; then the rollers are removed from each other until the further advanced sheet metal reaches the inlet point with the following edge. Under returning feed then the rounding of the second portion of the trailing edge takes place against the first portion. As soon as the center of the sheet is reached again, the rounding is complete. The center of the sheet, and no longer the leading edge, is now at the entry point, the edges of this opposite, on the other side of the round roller.

Die Wirkung der oben geschilderten Ausführungsform tritt ein, wenn nach Erstellung des ersten Teilbereichs der zweite Teilbereich erfindungsgemäss gerundet wird. Dabei ist nicht wesentlich, unter welcher Vorschubrichtung der erste Teilbereich gerundet wurde; es ist denkbar, das Blech durch die beabstandeten Walzen bis zu dessen Mitte hindurchzufahren, die Walzen zu schliessen und dann den ersten Teilbereich von der Mitte bis zur "vorlaufenden" Kante zur runden. Dann ist die Vorschubrichtung während dem Runden des ersten und des zweiten Teilbereichs dieselbe.The effect of the above-described embodiment occurs when, after the first partial region has been created, the second partial region according to the invention is rounded. It is not essential under which feed direction, the first portion was rounded; it is conceivable to pass the sheet through the spaced rolls to the center thereof, to close the rolls and then to round the first portion from the center to the "leading edge". Then the feed direction during the rounding of the first and the second portion is the same.

Gleichzeitig ist es bei der oben geschilderten Ausführungsform so, dass der letzte gerundete Bereich derart gerundet wird, dass die bei dieser letzten (hier: der zweiten) Rundung vorlaufende Kante bei Beendigung der Rundung betriebsfähig mit einer Einrichtung zum Definieren der Kantenlage zusammenwirkt.At the same time, in the above-described embodiment, the last rounded region is rounded such that the edge leading in this last (here: the second) rounding operatively cooperates with a device for defining the edge position upon completion of the rounding.

Nachfolgend soll die Erfindung anhand der Zeichnungen näher erläutert werden. Dabei sind nur die für das Verständnis der Erfindung wesentlichen Elemente schematisch dargestellt. Es zeigt:

Fig. 1
ein Rundverfahren gemäss Stand der Technik,
Fig. 2
ein zu rundendes Blech,
Fig. 3a bis 3d
ein Beispiel für ein erfindungsgemäss zu rundendes Blech, und
Fig. 4a bis 4c
ein weiteres Beispiel für ein erfindungsgemäss zu rundendes Blech
The invention will be explained in more detail with reference to the drawings. Only the essential elements for understanding the invention are shown schematically. It shows:
Fig. 1
a round process according to the prior art,
Fig. 2
a sheet to be rounded,
Fig. 3a to 3d
an example of a sheet according to the invention to be rounded, and
Fig. 4a to 4c
a further example of a sheet according to the invention to be rounded

Fig. 1 zeigt einen konventionellen Zweiwalzenrundapparat 1 mit einer Rundwalze 2 und einer Führungswalze 3; die Führungswalze besitzt eine druckelastische Beschichtung 4, durch welche ein Blech 10 gegen die Rundwalze 2 gepresst werden kann, derart, dass das Blech an der Rundwalze 2 zum anliegen kommt und dadurch plastisch verformt wird. Das Blech 10 besitzt eine vorlaufende Kante V und eine nachlaufende Kante N. Die nachlaufende Kante N befindet sich in der Einlaufstelle 5, die vorlaufende Kante V unmittelbar davor; der Rundvorgang ist abgeschlossen. Rotationsrichtung der Walzen 2,3 mit Vorschub des Blechs 10 sind durch die eingezeichneten Pfeile markiert.Fig. 1 shows a conventional Zweiwalzenrundapparat 1 with a round roller 2 and a guide roller 3; the guide roller has a pressure-elastic coating 4, by which a sheet 10 can be pressed against the circular roller 2, such that the sheet comes to rest on the circular roller 2 and is thereby plastically deformed. The sheet 10 has a leading edge V and a trailing edge N. The trailing Edge N is in the inlet 5, the leading edge V immediately before it; the rounding process is completed. The direction of rotation of the rollers 2, 3 with feed of the sheet 10 are marked by the arrows shown.

In allen Figuren bezeichnet "Vorschub" die Transportrichtung des Blechs 10 von links nach rechts durch den Rundapparat 1 hindurch und "rücklaufender Vorschub" die Gegenrichtung.In all figures, "feed" refers to the direction of transport of the sheet 10 from left to right through the round apparatus 1 through and "returning feed" the opposite direction.

Das Blech 10 weist gekrümmte (fett dargestellte) Bereiche 11 und gerade (durch eine Doppellinie dargestellte) Bereiche 12 auf. Gekrümmte Bereiche entstehen durch zusammengepresste Walzen 2,3 und gerade Bereiche durch beabstandete Walzen 2,3 während dem Vorschub.The sheet 10 has curved portions 11 (shown in bold) and straight portions 12 (shown by a double line). Curved areas are created by compressed rollers 2,3 and straight areas by spaced rollers 2,3 during feed.

Fig. 2 zeigt ein Blech 10 vor der Rundung mit Ausnehmungen 15 für eine künftige Rohrverzweigung, einer Filterstruktur 16 sowie weiteren Ausnehmungen 17. Solch ein Blech ist schwierig zu runden und zu führen, da die verschiedenen Strukturen Schwächungen oder Versteifungen darstellen, welche als Unregelmässigkeiten die Verarbeitung beeinträchtigen.Fig. 2 shows a sheet 10 before rounding with recesses 15 for a future branch pipe, a filter structure 16 and other recesses 17. Such a sheet is difficult to round and lead, as the various structures represent weakenings or stiffening, which as irregularities the Processing.

Fig. 3a bis 3d zeigt ein Ausführungsbeispiel für den erfindungsgemässen Rundvorgang: In Fig 3a ist das Blech 10 mit seiner vorlaufenden Kante V vor der Einlaufstelle 5 positioniert.3a to 3d shows an exemplary embodiment of the rounding process according to the invention: In FIG. 3a, the sheet metal 10 is positioned with its leading edge V in front of the inlet point 5.

In Fig. 3b ist ein erster (in der Figur fett dargestellter) Teilbereich 20 des Blechs 10 bereits gerundet, während ein zweiter (in der Figur durch Doppellinien dargestellter) Teilbereich 21 den Rundapparat 1 noch nicht passiert hat. Der erste Teilbereich 20 erstreckt sich über die halbe Blechlänge, so dass die erzielte Krümmung einem Halbkreis entspricht.In Fig. 3b, a first (shown in bold in the figure) portion 20 of the sheet 10 is already rounded, while a second (shown in the figure by double lines) portion 21 the round apparatus 1 has not yet happened. The first portion 20 extends over half the sheet length, so that the curvature obtained corresponds to a semicircle.

Fig. 3c zeigt, dass der Vorschub fortgesetzt wurde, bis die nachlaufende Kante N die Einlaufstelle 5 erreicht hat. Eine Krümmung des zweiten Teitbereichs 21 ist aber unterblieben, da die Walzen 2,3 während dem Vorschub im Abstand gehalten worden sind.FIG. 3 c shows that the feed has been continued until the trailing edge N has reached the inlet point 5. A curvature of the second time range 21 is omitted, since the rollers have been kept 2.3 during the feed at a distance.

Fig. 3d zeigt das Blech 10 nach fertig erfolgtem Rundvorgang. Der zweite Teilbereich 21 ist unter rückläufigem Vorschub von der nachlaufenden Kante N her gerundet worden. Dadurch hat die Rundung im zweiten Teilbereich bei der Kante N eingesetzt und sich gegen den ersten Teilbereich 20 hin entwickelt, solange, bis der zweite Teilbereich vollständig gerundet war.Fig. 3d shows the sheet 10 after completed rounding process. The second portion 21 has been rounded under retrograde feed from the trailing edge N ago. As a result, the rounding in the second partial region has begun at the edge N and has developed towards the first partial region 20 until the second partial region has been completely rounded.

Weiter dargestellt ist in den Fig. 3a bis 3d eine schematisch dargestellte Einrichtung 30 zum Definieren der Kantenlage der Kanten V und N. Die Einrichtung 30 hält die Position der Kanten V und N fest, wenn das Blech 10 für weitere Verarbeitung z.B. axial aus dem Rundapparat 1 abgezogen wird. Dadurch, dass die Kanten V und N nach erfolgter Rundung nicht bei der Einlaufstelle 5 liegen, kann die Einrichtung 30 im Pfad der Kanten V und N angeordnet werden, so dass eine Deformation des gerundeten Blechs 10 unterbleibt.Further illustrated in Figs. 3a to 3d is schematically illustrated means 30 for defining the edge position of the edges V and N. The means 30 holds the position of the edges V and N when the sheet 10 for further processing e.g. is withdrawn axially from the round apparatus 1. Due to the fact that the edges V and N are not located at the inlet point 5 after rounding, the device 30 can be arranged in the path of the edges V and N, so that a deformation of the rounded sheet 10 is omitted.

Die Einrichtung 30 kann an beliebiger Stelle auf dem Pfad der Kanten V und N liegen; die Möglichkeiten sind nur durch den Raumbedarf der Einrichtung 30 im Hinblick auf die Nähe zur Einlaufstelle 5 beschränkt. Ebenso kann die Einrichtung 30 mit in den Figuren nicht näher dargestellten Führungsnuten für die Kanten V und N oder andern Führungsmitteln ausgestattet sein.The device 30 may be located anywhere on the path of the edges V and N; the possibilities are limited only by the space requirement of the device 30 in view of the proximity to the inlet point 5. Likewise, the device 30 may be equipped with not shown in the figures guide grooves for the edges V and N or other guide means.

Im Ergebnis ist beim dargestellten Ausführungsbeispiel das Blech 10 in die Einrichtung 30 hinein gerundet worden, wobei die Rundungen des zweiten Teilbereiches 21 beendet wurde, sobald die während der rundum dieses Teilbereichs 21 tatsächlich vorlaufende Kante mit der Einrichtung 30 betriebsfähig zusammenwirkte.As a result, in the illustrated embodiment, the sheet 10 has been rounded into the device 30, wherein the curves of the second portion 21 has ended as soon as the actually leading edge of the portion 21 cooperated with the means 30 in an operative manner.

Fig. 4a bis 4c zeigen eine weitere Ausführungsform des erfindungsgemässen Verfahrens. In Fig. 4a ist dargestellt, wie das Blech 10 zur Hälfte durch den Rundapparat 1 hindurch vorgeschoben worden ist; mit von einander beabstandeten Walzen 2,3, da eine Rundung nicht stattgefunden hat.FIGS. 4a to 4c show a further embodiment of the method according to the invention. In Fig. 4a is shown how the sheet 10 by half the round apparatus 1 has been advanced; with spaced rollers 2,3, since a rounding has not occurred.

In Fig. 4b hat der Rundvorgang unter rückläufigem Vorschub eingesetzt, ein erster Teilbereich 25 befindet sich in Rundung, welche sich von der Blechmitte zur vorlaufenden Kante V hin entwickelt. Nach beendigter Rundung des ersten Teilbereichs 25 befindet sich die vorlaufende Kante V in der Einlaufstelle 5. Ein zweiter Teilbereich 26 des Blechs 10 bleibt unberührt.In Fig. 4b of the rounding process has been used under receding feed, a first portion 25 is in a rounding, which develops from the center of the sheet to the leading edge V out. After completion of the rounding of the first portion 25, the leading edge V is in the inlet 5. A second portion 26 of the sheet 10 remains untouched.

Danach wird unter Vorschub das Blech 10 durch den Rundapparat hindurchgezogen bis die nachlaufende Kante N die Einlaufstelle 5 erreicht hat. Der zweite Teilbereich 26 passiert dabei die Walzen 2,3 in beabstandeter Stellung.Thereafter, the sheet 10 is pulled through the round apparatus with feed until the trailing edge N has reached the inlet point 5. The second portion 26 passes through the rollers 2,3 in a spaced position.

Fig. 4c zeigt, wie der zweite Teilbereich 26 gerundet wird, ausgehend von der nachlaufenden Kante N zum Beginn 27 des ersten Teilbereichs 25 hin. Nach fertig erfolgter Rundung entspricht die Situation Fig. 3d.FIG. 4c shows how the second partial region 26 is rounded, starting from the trailing edge N toward the beginning 27 of the first partial region 25. After completion of the rounding, the situation corresponds to Fig. 3d.

Auch bei dieser Ausführungsform wurde der zweite (und letzte) Teilbereich 26 solange gerundet, bis die während dieser Rundungen tatsächlich vorlaufende Kante mit der Einrichtung 30 zusammenwirkt.Also in this embodiment, the second (and last) portion 26 has been rounded until the actually leading edge during these rounds cooperates with the means 30.

In Fig. 3a bis 3d erfolgte die Rundung der beiden Teilbereiche mit ungleicher Vorschubrichtung, in Fig. 4a bis 4c unter gleicher Vorschubrichtung. Beide male wurde aber der zweite Teilbereich 21,26 gegen den ersten Teilbereich 25,26 hin entwickelt, was dazu führte, dass die Endlage der Kanten V, N nicht bei der Einlaufstelle 5 liegt. Entsprechend liegt es im Bereich der Erfindung, die Rundung in einer beliebigen Anzahl Teilbereiche, aber mindestens zwei, durchzuführen, solange ein Teilbereich gegen einen andern hin entwickelt wird. Unter dieser Bedingung können gerade und gekrümmte Teilbereiche miteinander zu beliebigen Profilen des Blechkörpers miteinander kombiniert werden. Auch ist es nicht notwendig, geschlossene Profile zu erzeugen, da die Einrichtung 30 für halboffene Profile ausgebildet werden kann. Die Einrichtung 30 ist vorzugsweise in einer durch die Drehachsen der Walzen 2,3 liegenden Ebene angeordnet, so wie dies in den Figuren dargestellt ist.In Fig. 3a to 3d, the rounding of the two sub-areas with unequal feed direction, in Fig. 4a to 4c under the same feed direction. Both times, however, the second portion 21,26 was developed against the first portion 25,26 out, which meant that the end position of the edges V, N is not at the inlet point 5. Accordingly, it is within the scope of the invention to perform the rounding in any number of sub-ranges, but at least two, as long as one sub-range is developed toward another. Under this condition, straight and curved portions can be combined together to arbitrary profiles of the sheet metal body. Also, it is not necessary to create closed profiles, since the device 30 can be formed for semi-open profiles. The Device 30 is preferably arranged in a plane lying through the axes of rotation of rollers 2,3, as shown in the figures.

Die Erfindung erstreckt sich über Blech insbesondere mit den in der Beschreibungseinleitung genannten Massen hinaus auf jedes metallische oder nichtmetallische, plastisch verformbare Material, bei dessen Rundung sich die Aufgabe der vorliegenden Erfindung stellt.The invention extends over sheet metal, in particular with the masses mentioned in the introduction, to any metallic or non-metallic, plastically deformable material whose rounding is the object of the present invention.

Claims (10)

  1. Method for rounding a sheet or a plate, preferably a metal sheet (10), to a mechanically defined ejection position by a two-roll rounding machine (1) having rounding rolls (2, 3) with a device (30) for defining the position of the edges V and N of the sheet or plate (10), wherein a) a predetermined second part region (21, 26) of the sheet or plate (10) is rounded after a predetermined first part region (20, 25) has been rounded, b) a feed direction of the sheet or plate (10) is selected for the rounding of the second part region (21, 26) such that the region (21, 26) being rounded travels towards the previously rounded first part region (20, 25), and c) rounding of the last region to be rounded is effected in such a way that the edge which is leading during this last rounding operatively interacts with the device (30) at the end of the rounding operation.
  2. Method according to Claim 1, characterized in that the part regions (20, 25 and 21, 26) are rounded with feed in opposite directions.
  3. Method according to Claim 1 or Claim 2, characterized in that a total of two part regions (20, 21 and 25, 26) are rounded, and the two part regions are of equal size and preferably each cover 50% of the area of the sheet.
  4. Method according to any one of Claims 1 to 3, characterized in that the sheet after having been rounded in the first part region (20) from a leading edge V, continues to be fed in the same direction towards a trailing edge N with the rolls (2, 3) in the rounding apparatus (1) held in an inactive position so that rounding does not occur.
  5. Method according to Claim 3, characterized in that rounding of the second part region (21, 26) is continued until the trailing edge N comes into contact with the device (30) for defining the edge position.
  6. Method according to Claim 1, characterized in that to obtain a continuous rounding of the entire sheet or plate (10) the first part region (20) preferably reaching over half the sheet or plate (10) is rounded from a first leading edge of the sheet or plate (V) to the centre of the sheet or plate (10) and the sheet or plate (10) then continues to be fed in the same direction, but with no further plastic deformation, to a trailing edge of the sheet or plate (N), after which it is fed the opposite way from the said trailing edge with a reverse feed direction for the rounding of the second part region (25), until on the one hand the trailing edge of the sheet or plate (N) operatively interacts with a device (30) for defining the edge position and on the other hand at least full rounding of the sheet or plate (10) is obtained.
  7. Two-roll rounding machine (1) for rounding a sheet or plate, preferably a metal sheet (10), for carrying out the method according to any one of Claims 1 to 6 with a control operatively interacting with the elements of the machine (1) to change the feed direction and vary the working position of the rounding rolls (2, 3), characterized by a device (30) for defining an edge position of the rounded sheet or plate, preferably the rounded metal sheet (10).
  8. Two-roll rounding machine according to Claim 7, characterized in that a guide roll (3) provided with a compressively elastic layer (4) is provided.
  9. Two-roll rounding machine according to any one of Claims 7 8 [sic], characterized in that the device (30) for defining the edge position is configured so that after the sheet or plate (10) has been rounded the edges (V, N) are caught in guide elements such as guide grooves, for onward axial transport of the rounded body (10).
  10. Two-roll rounding machine according to any one of Claims 7 to 10, characterized in that the device (30) for defining the edge position is arranged in a plane formed by the axes of rotation of the rounding and guide rolls (2, 3).
EP00901464A 1999-03-05 2000-02-07 Method for circularly bending a sheet and multicylinder device for carrying out the method Expired - Lifetime EP1165265B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CH41099 1999-03-05
CH41099 1999-03-05
PCT/CH2000/000065 WO2000053353A1 (en) 1999-03-05 2000-02-07 Method for circularly bending a sheet and multicylinder device for carrying out the method

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EP1165265A1 EP1165265A1 (en) 2002-01-02
EP1165265B1 true EP1165265B1 (en) 2006-03-01

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EP00901464A Expired - Lifetime EP1165265B1 (en) 1999-03-05 2000-02-07 Method for circularly bending a sheet and multicylinder device for carrying out the method

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US (1) US6725699B1 (en)
EP (1) EP1165265B1 (en)
AT (1) ATE318663T1 (en)
AU (1) AU2274800A (en)
DE (1) DE50012312D1 (en)
WO (1) WO2000053353A1 (en)

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Publication number Priority date Publication date Assignee Title
JP4439573B2 (en) * 2008-07-29 2010-03-24 株式会社富士機械工作所 Cylindrical forming equipment

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2719562A (en) * 1950-07-15 1955-10-04 Raymond E Beegle Apparatus for forming metal channels and tubes
FR2140317A1 (en) 1971-06-10 1973-01-19 Masunori Mori Bending appts - bends ends of steel plate
US3879994A (en) * 1973-08-16 1975-04-29 Kenneth Michael Hume Plate rolling
US3899911A (en) * 1974-03-27 1975-08-19 Anvar Sheetmetal rolling machine
FI74414C (en) 1980-08-18 1988-02-08 Sl Tuotanto Oy ANORDING FOR FRAMSTAELLNING AV ETT METALLROER.
US4428215A (en) * 1980-09-19 1984-01-31 Hume Kenneth Michael Plate bending method
US4606208A (en) * 1984-05-16 1986-08-19 Kaiser Steel Corporation Pipe forming apparatus
US4706488A (en) * 1984-05-16 1987-11-17 Kaiser Steel Corporation Method of roll forming cylindrical pipe
US4628721A (en) * 1984-05-16 1986-12-16 Kaiser Steel Corporation Method of roll forming cylindrical pipe
CH688437A5 (en) * 1990-04-12 1997-09-30 Haeusler Ag Chr For Cylindrical-bending a plate serving forming machine.

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DE50012312D1 (en) 2006-04-27
AU2274800A (en) 2000-09-28
US6725699B1 (en) 2004-04-27
WO2000053353A1 (en) 2000-09-14
EP1165265A1 (en) 2002-01-02

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