EP0204290B1 - A sheetmetal rolling machine for making a conical shell from a sheetmetal blank - Google Patents

A sheetmetal rolling machine for making a conical shell from a sheetmetal blank Download PDF

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Publication number
EP0204290B1
EP0204290B1 EP86107426A EP86107426A EP0204290B1 EP 0204290 B1 EP0204290 B1 EP 0204290B1 EP 86107426 A EP86107426 A EP 86107426A EP 86107426 A EP86107426 A EP 86107426A EP 0204290 B1 EP0204290 B1 EP 0204290B1
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Prior art keywords
workpiece
roller
conical shell
sheet metal
sheet
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EP86107426A
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German (de)
French (fr)
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EP0204290B2 (en
EP0204290A2 (en
EP0204290A3 (en
Inventor
Hans Zeugin
Heinz Ludwig
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Chr Haeusler AG
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Chr Haeusler AG
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Priority to AT86107426T priority Critical patent/ATE47676T1/en
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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

Definitions

  • 3-roll machines or 4-roll machines are used, which form the cut sheet metal, which has two arched edges of different lengths arranged opposite one another, in one or more passages to form the cone. Since the surface lines of a cone are not parallel to each other, the sheet must not be moved straight through the machines; it must change its direction much more continuously such that the surface lines always run parallel to the roller axes, or, which is synonymous, so that that point of each curved edge which is between the transport rollers always indicates the direction of advance.
  • the conventional roll-sheet metal rounding machines have a brake shoe against which the shorter of the two curved edges rests and from which it is braked, so that the change in direction is ensured.
  • the roll sheet metal rounding machine which, as is customary in such machines, with two superposed feed rollers and at least one laterally offset with respect to the feed rollers and with respect to them obliquely up and down movable bending roller, and braking means for engaging is provided on the shorter of the two arcuate edges of the workpiece as well as for braking the feed of the shorter workpiece edge, it is now possible to do without a brake shoe which causes the edge swell, since it is identified by a reader in order to read surface lines or surface line ends drawn on the workpiece , and by a control device controlled by the reading device, which controls the feed and the pivoting of the workpiece step by step.
  • the invention additionally also relates to a roll sheet metal rounding machine having the features of claim 4.
  • 1 denotes the top roller, 2 the bottom roller, 3 and 4 the two side rollers.
  • the workpiece ie here the finished machined cone jacket, is designated by 5.
  • the bearings of the individual rollers are not shown, and it is known to mount the top roller in such a way that one of its bearings can be folded down so that the finished workpiece can be removed from the machine.
  • the hydraulic cylinders which are used to move the roller bearings and which are shown as if they were acting on the geometric axes of the rollers are only indicated schematically.
  • the hydraulic cylinders of the lower roller are designated with 21 and 22, those of the side rollers with 31 and 32 and 41 respectively.
  • the second cylinder belonging to the side roller 4 is not visible in the drawing. Also not shown in the drawing are the drive elements of the top roller and the bottom roller.
  • a metal plate cut to produce a cone serves as the workpiece. If a straight cone is to be produced, the plate has two arcuate edges which are concentric with one another and two straight edges connecting these edges, the extensions of which intersect at the center of the arcuate edges. If a slanted cone is to be produced or a cone with a non-circular cross-section, the workpiece naturally has a slightly different one known form.
  • the workpiece 5 is, as usual, inserted into the roll plate rounding machine and held on the entire length of the workpiece between the upper roll 1 and the lower roll 2. Then its free edge is bent by infeed of the side roller 3 serving as a bending roller. Then the side roller 3 is removed again from the workpiece 5 and the lower roller 2 is pivoted such that the gap opens in the direction toward the hydraulic cylinder 21, as can be seen from FIG. 1, where only the longer arcuate edge 5a of the workpiece 5 is clamped between the two rollers 1 and 2. Now the workpiece is advanced a very small distance by turning the rollers.
  • a brake shoe, not shown, or a controllable clamping device causes the workpiece to pivot so that the surface lines of the workpiece to be generated are located between the two transport rollers 1 and 2.
  • a measuring roller or an optical scanning device that measures the feed at the shorter of the two arcuate edges. The size of this feed can be compared in a computer with the feed caused by the roll rotation on the longer arcuate edge. If the ratio determined in this way does not correspond to the ratio of the lengths of the two arcuate edges entered in the computer, the opening angle of the gap between the rollers is changed or the clamping device is actuated in order to obtain the correct ratio between feed and pivoting. Since such computers, which issue control commands when the measured values deviate from an entered target value, are known per se, they are not described in more detail here.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Continuous Casting (AREA)

Abstract

A method of producing a conical shell from a metal sheet cut to size. The method includes feeding the sheet in a nip between two transport rollers an incremental distance between respective positions in which nonparallel straight line generatrices on the sheet defining the shell to be produced are in an aligned with the nip, translating a bending roller into engagement with the sheet to incrementally bend the sheet in a direction perpendicular to the generatrix between the nip, then retracting the bending roller away from the sheet, and successively repeating the above steps until the sheet is in the shape of the conical shell to be produced.

Description

Zur Herstellung von Konen aus zugeschnittenen Blechplatten werden 3-Walzenmaschinen oder 4-Walzenmaschinen benützt, die das zugeschnittene Blech, das zwei einander gegenüber angeordnete, bogenförmige Ränder unterschiedlicher Länge aufweist, in einem oder mehreren Durchgängen zum Konus formen. Da die Mantellinien bei einem Konus nicht zueinander parallel verlaufen, darf das Blech nicht gerade durch die Maschinen bewegt werden; es muß viel mehr kontinuierlich seine Richtung derart ändern, daß die Mantellinien stets parallel zu den Walzenachsen verlaufen, oder, was gleichbedeutend ist, so, daß diejenige Stelle jedes gebogenen Randes, die sich zwischen den Transportwalzen befindet, stets die Vorschubrichtung angibt. Zu diesem Zweck weisen die üblichen Walzen-Blechrundmaschinen einen Bremsschuh auf, an welchem der kürzere der beiden gebogenen Ränder anliegt und von welchem er gebremst wird, so dass die Richtungsänderung gewährleistet ist. Eine derartige Blech-Rundbiegemaschine mit vier Walzen ist aus der DE-B 1 917 219 bekannt. Die Blechbearbeitung mit derartigen Maschinen hat jedoch den bekannten Nachteil, dass der Bremsschuh grosse Kräfte auf das Werkstück ausübt, so dass die Möglichkeit besteht, dass der bogenförmige Rand aufgestaucht wird. Dies ist besonders dann unzweckmässig, wenn er bereits vor dem Biegen als einigermassen spitz auslaufende Schweisskante ausgebildet werden sollte, weil ein derart geschwächter Rand den Stauchkräften stets nachgibt, so dass vor dem Biegen am betreffenden Rand keine Schweisskantenvorbereitung vorgenommen werden kann. Mit dem speziellen Bremsschuh nach der DE-B 1 917 219 war es zwar möglich, die Verformungsgefahr zu verringern, aber nicht in allen Fällen völlig zu vermeiden.For the production of cones from cut sheet metal plates, 3-roll machines or 4-roll machines are used, which form the cut sheet metal, which has two arched edges of different lengths arranged opposite one another, in one or more passages to form the cone. Since the surface lines of a cone are not parallel to each other, the sheet must not be moved straight through the machines; it must change its direction much more continuously such that the surface lines always run parallel to the roller axes, or, which is synonymous, so that that point of each curved edge which is between the transport rollers always indicates the direction of advance. For this purpose, the conventional roll-sheet metal rounding machines have a brake shoe against which the shorter of the two curved edges rests and from which it is braked, so that the change in direction is ensured. Such a sheet metal bending machine with four rollers is known from DE-B 1 917 219. Sheet metal processing with such machines, however, has the known disadvantage that the brake shoe exerts large forces on the workpiece, so that there is the possibility that the arcuate edge is upset. This is particularly unsuitable if it should already be formed as a somewhat pointed welding edge before bending, because such a weakened edge always yields to the compression forces, so that no welding edge preparation can be carried out on the relevant edge before bending. With the special brake shoe according to DE-B 1 917 219 it was possible to reduce the risk of deformation, but not to avoid it completely in all cases.

Bei der Walzen-Blechrundmaschine nach der vorliegenden Erfindung, die, wie es bei solchen Maschinen üblich ist, mit zwei übereinander angeordneten Vorschubwalzen und mindestens einer in bezug auf die Vorschubwalzen seitlich versetzten und gegenüber diesen schräg auf- und abwärts verfahrbaren Biegewalze, und Bremsmittel zum Angreifen am kürzeren der beiden bogenförmigen Ränder des Werkstückes sowie zum Bremsen des Vorschubes des kürzeren Werkstückrandes versehen ist, ist es nun möglich, ohne einen die Randaufstauchung bewirkenden Bremsschuh auszukommen, da sie durch ein Lesegerät gekennzeichnet ist, um auf dem Werkstück eingezeichnete Mantellinien oder Mantellinienenden zu lesen, und durch ein durch das Lesegerät gesteuertes Steuergerät, das den Vorschub und das Verschwenken des Werkstückes schrittweise steuert.In the roll sheet metal rounding machine according to the present invention, which, as is customary in such machines, with two superposed feed rollers and at least one laterally offset with respect to the feed rollers and with respect to them obliquely up and down movable bending roller, and braking means for engaging is provided on the shorter of the two arcuate edges of the workpiece as well as for braking the feed of the shorter workpiece edge, it is now possible to do without a brake shoe which causes the edge swell, since it is identified by a reader in order to read surface lines or surface line ends drawn on the workpiece , and by a control device controlled by the reading device, which controls the feed and the pivoting of the workpiece step by step.

Bei dieser Maschine, bei welcher das Vorschieben und das Biegen in getrennten, einander folgenden, kleinen Schritten durchgeführt wird, ist es möglich, die auf den Werkstückrand einwirkenden Kräfte so klein zu halten, dass sie auch dann diesen Rand nicht beschädigen, wenn er bereits als Schweisskante ausgebildet ist. Dies lässt sich im wesentlichen dadurch erreichen, dass man die zum Vorschieben des Werkstückes als Vorschubwalzen dienenden Walzen derart verstellt, dass sich der Walzspalt nach einer Seite hin so öffnet, dass das Werkstück nur an einer verhältnismässig schmalen Stelle am längeren der beiden bogenförmigen Ränder festgeklemmt wird, so dass es im übrigen Bereich nicht festgehalten wird und sich verhältnismässig leicht verschwenken lässt. Um die Verschwenkung zu bewirken, könnte ein Bremsschuh verwendet werden, dessen Gleitfläche eine an die Kantenform des Werkstückes angepasste Form hat. Zweckmässiger ist es jedoch, eine steuerbare Klemmvorrichtung zu benützen, welche das Werkstück am kürzeren der beiden bogenförmigen Ränder während gewisser Intervalle festklemmt oder seine Verschiebung behindert. Nach jedem Vorschubschritt werden dann die beiden Transportwalzen wieder in die ursprüngliche Lage zurückgestellt, in der sie zueinander parallel verlaufen und das Werkstück auf der ganzen Mantellinie festhalten, damit es sich beim nachfolgenden Biegevorgang nicht verschiebt.In this machine, in which the advancement and bending are carried out in separate, successive, small steps, it is possible to keep the forces acting on the workpiece edge so small that they do not damage this edge even if it is already as Welding edge is formed. This can essentially be achieved by adjusting the rollers used as feed rollers to advance the workpiece in such a way that the roll gap opens to one side in such a way that the workpiece is only clamped at a relatively narrow point on the longer of the two arcuate edges , so that it is not held in the rest of the area and can be pivoted relatively easily. In order to effect the pivoting, a brake shoe could be used, the sliding surface of which has a shape adapted to the edge shape of the workpiece. It is more expedient, however, to use a controllable clamping device which clamps the workpiece on the shorter of the two arcuate edges during certain intervals or obstructs its displacement. After each feed step, the two transport rollers are then returned to their original position, in which they run parallel to each other and hold the workpiece along the entire surface line so that it does not shift during the subsequent bending process.

Die Erfindung betrifft zusätzlich auch eine Walzen-Blechrundmaschine mit den Merkmalen des Anspruchs 4.The invention additionally also relates to a roll sheet metal rounding machine having the features of claim 4.

Nachfolgend werden anhand der Zeichnung Ausführungsbeispiele der Erfindung beschrieben.

  • Die Figur 1 zeigt rein schematisch eine 4-Walzen-Biegemaschine in perspektivischer Darstellung, mit einem fertig bearbeiteten Werkstück und
  • die Figur 2 einen schematischen Querschnitt durch die Maschine kurz nach Beginn des Verformens.
Exemplary embodiments of the invention are described below with reference to the drawing.
  • Figure 1 shows purely schematically a 4-roll bending machine in perspective, with a finished workpiece and
  • 2 shows a schematic cross section through the machine shortly after the start of the deformation.

In der Zeichnung bezeichnet 1 die Oberwalze, 2 die Unterwalze, 3 und 4 die beiden Seitenwalzen. Mit 5 ist das Werkstück, also hier der fertig bearbeitete Konusmantel bezeichnet. Die Lager der einzelnen Walzen sind nicht dargestellt, wobei es bekannt ist, die Oberwalze so zu lagern, dass sich eines ihrer Lager nach unten abklappen lässt, damit das fertig bearbeitete Werkstück aus der Maschine herausgenommen werden kann.In the drawing, 1 denotes the top roller, 2 the bottom roller, 3 and 4 the two side rollers. The workpiece, ie here the finished machined cone jacket, is designated by 5. The bearings of the individual rollers are not shown, and it is known to mount the top roller in such a way that one of its bearings can be folded down so that the finished workpiece can be removed from the machine.

Nur rein schematisch sind die Hydraulikzylinder angedeutet, die zum Verschieben der Walzenlager dienen, und die so dargestellt sind, als würden sie an den geometrischen Achsen der Walzen angreifen. Die Hydraulikzylinder der Unterwalze sind mit 21 und 22 bezeichnet, diejenigen der Seitenwalzen mit 31 und 32 bzw. 41. Der zweite zur Seitenwalze 4 gehörende Zylinder ist in der Zeichnung nicht sichtbar. Ebenfalls nicht dargestellt in der Zeichnung sind die Antriebsorgane der Oberwalze und der Unterwalze.The hydraulic cylinders which are used to move the roller bearings and which are shown as if they were acting on the geometric axes of the rollers are only indicated schematically. The hydraulic cylinders of the lower roller are designated with 21 and 22, those of the side rollers with 31 and 32 and 41 respectively. The second cylinder belonging to the side roller 4 is not visible in the drawing. Also not shown in the drawing are the drive elements of the top roller and the bottom roller.

Als Werkstück dient eine für die Herstellung eines Konus zugeschnittene Metallplatte. Wenn ein gerader Kegelkonus herzustellen ist, dann weist die Platte zwei zueinander konzentrische, bogenförmige Ränder und zwei diese Ränder verbindende, gerade Ränder auf, deren Verlängerungen sich im Zentrum der bogenförmigen Ränder schneiden. Falls ein schiefer Konus herzustellen ist oder ein Konus mit einem nicht kreisförmigen Querschnitt, so hat das Werkstück natürlich eine etwas andere, an sich bekannte Form.A metal plate cut to produce a cone serves as the workpiece. If a straight cone is to be produced, the plate has two arcuate edges which are concentric with one another and two straight edges connecting these edges, the extensions of which intersect at the center of the arcuate edges. If a slanted cone is to be produced or a cone with a non-circular cross-section, the workpiece naturally has a slightly different one known form.

Das Werkstück 5 wird wie üblich in die Walzen-Blechrundmaschine eingeführt und zwischen der Oberwalze 1 und der Unterwalze 2 auf der ganzen Werkstücklänge festgehalten. Dann wird sein freier Rand durch Zustellen der als Biegewalze dienenden Seitenwalze 3 angebogen. Alsdann wird die Seitenwalze 3 wieder vom Werkstück 5 entfernt und es wird die Unterwalze 2 so verschwenkt, dass sich der Spalt in Richtung gegen den hydraulischen Zylinder 21 öffnet, wie das aus der Figur 1 ersichtlich ist, wo nur der längere bogenförmige Rand 5a des Werkstückes 5 satt zwischen den beiden Walzen 1 und 2 eingeklemmt ist. Nun wird das Werkstück durch Drehen der Walzen ein sehr kleines Stück weit vorgeschoben. Ein nicht gezeichneter Bremsschuh oder eine steuerbare Klemmvorrichtung bewirkt dabei ein Verschwenken des Werkstückes so, dass sich die zu erzeugenden Mantellinien des Werkstückes zwischen den beiden Transportwalzen 1 und 2 befinden. Es ist möglich, zusätzlich zum Bremsschuh eine Messrolle oder eine optische Abtastvorrichtung zu verwenden, die den Vorschub am kürzeren der beiden bogenförmigen Ränder misst. In einem Rechner lässt sich das Mass dieses Vorschubs mit dem durch die Walzendrehung bewirkten Vorschub am längeren bogenförmigen Rand vergleichen. Wenn das so bestimmte Verhältnis nicht mit dem in den Rechner eingegebenen Verhältnis der Längen der beiden bogenförmigen Ränder übereinstimmt, wird der Offnungswinkel des Spaltes zwischen den Walzen geändert oder die Klemmvorrichtung betätigt, um das richtige Verhältnis zwischen Vorschub und Verschwenkung zu erhalten. Da derartige Rechner, die beim Abweichen der Messwerte von einem eingegebenen Sollwert Steuerbefehle erteilen, an sich bekannt sind, werden sie hier nicht näher beschrieben.The workpiece 5 is, as usual, inserted into the roll plate rounding machine and held on the entire length of the workpiece between the upper roll 1 and the lower roll 2. Then its free edge is bent by infeed of the side roller 3 serving as a bending roller. Then the side roller 3 is removed again from the workpiece 5 and the lower roller 2 is pivoted such that the gap opens in the direction toward the hydraulic cylinder 21, as can be seen from FIG. 1, where only the longer arcuate edge 5a of the workpiece 5 is clamped between the two rollers 1 and 2. Now the workpiece is advanced a very small distance by turning the rollers. A brake shoe, not shown, or a controllable clamping device causes the workpiece to pivot so that the surface lines of the workpiece to be generated are located between the two transport rollers 1 and 2. In addition to the brake shoe, it is possible to use a measuring roller or an optical scanning device that measures the feed at the shorter of the two arcuate edges. The size of this feed can be compared in a computer with the feed caused by the roll rotation on the longer arcuate edge. If the ratio determined in this way does not correspond to the ratio of the lengths of the two arcuate edges entered in the computer, the opening angle of the gap between the rollers is changed or the clamping device is actuated in order to obtain the correct ratio between feed and pivoting. Since such computers, which issue control commands when the measured values deviate from an entered target value, are known per se, they are not described in more detail here.

Es ist auch möglich, auf dem Werkstück Mantellinien oder die Enden von Mantellinien des zu erzeugenden Konusmantels einzuzeichnen und den Rechner mit einer optischen Ablesevorrichtung zu versehen, die dem Rechner die nötigen Informationen gibt, damit dieser die Transportwalzen und die Klemmvorrichtung so steuert, dass das Werkstück zwischen zwei Biege-Operationen derart schrittweise vorgeschoben und gleichzeitig verschwenkt wird, dass die Biege-Operation jeweilen bei einer eingezeichneten Mantellinie erfolgt. Nach jedem Vorschubschritt werden dann die Transportwalzen wieder in ihre Ausgangslage gebracht, in welcher sie achsparallel angeordnet sind, so dass das Werkstück auf seiner ganzen Länge gleichmässig festgehalten wird und das Zustellen der die Krümmung des Werkstückes bewirkenden seitlichen Biegewalze 3 keine Verschiebung des Werkstückes zwischen den Walzen 1 und 2 zur Folge hat. Nach dem Biegeschritt erfolgt erneut ein Verstellen der Transportwalzen und ein Transportschritt, anschliessend wieder ein Biegeschritt.It is also possible to draw on the workpiece surface lines or the ends of surface lines of the cone shell to be produced and to provide the computer with an optical reading device which gives the computer the necessary information so that it controls the transport rollers and the clamping device so that the workpiece between two bending operations is gradually advanced and pivoted at the same time that the bending operation takes place in each case with a drawn generatrix. After each feed step, the transport rollers are then brought back to their starting position, in which they are arranged axially parallel, so that the workpiece is held evenly over its entire length and the infeed of the lateral bending roller 3 causing the curvature of the workpiece does not cause the workpiece to move between the rollers 1 and 2 results. After the bending step, the transport rollers are adjusted again and a transport step is carried out, followed by another bending step.

Claims (4)

1. Roller sheet metal bending machine, which serves to produce a conical shell from a metal plate cut to size, with two advancing rollers (1, 2) arranged one above the other and at least one bending roller (3, 4), which is displaced laterally with respect to the advancing rollers (1, 2) and movable obliquely upwards and downwards relative to these, wherein braking means are provided for engaging at the shorter of both the arcuate rims of the workpiece (5) as well as for the braking of the advance of the shorter workpiece rim, characterised by a reading device in order to read generatrices or ends of generatrices drawn on the workpiece (5) and by a control device which is controlled by the reading device and in stepwise manner controls the advance and the pivotation of the workpiece (5).
2. Roller sheet metal bending machine according to claim 1, characterised thereby, that the braking means display a brake shoe.
3. Roller sheet metal bending machine according to claim 1 or 2, characterised thereby, that the braking means display a clamping device.
4. Roller sheet metal bending machine, which serves to produce a conical shell from a metal plate cut to size, with two advancing rollers (1, 2) arranged one above the other and at least one bending roller (3, 4), which is displaced laterally with respect to the advancing rollers (1, 2) and movable obliquely upwards and downwards relative to these, characterised by a clamping device, which for the braking of the advance of the workpiece engages at the shorter of both the arcuate rims, and an arithmetic unit, which controls this clamping device and the roller advance and into which one can enter the size or the number of the advancing steps as well as those magnitudes, by which the geometry of the conical shell to be produced lets itself be determined, in order that the workpiece to be treated is displaced and pivoted in stepwise manner by the cooperation of the advancing rollers (1, 2) and the clamping device in such a manner that the bending can always take place perpendicularly to the generatrix.
EP86107426A 1985-06-04 1986-06-02 A sheetmetal rolling machine for making a conical shell from a sheetmetal blank Expired - Lifetime EP0204290B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86107426T ATE47676T1 (en) 1985-06-04 1986-06-02 PROCESS FOR MANUFACTURING A CONUS SHELL USING A ROLLER SHEET METAL ROUNDING MACHINE AND MACHINE FOR CARRYING OUT THE PROCESS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH235685 1985-06-04
CH2356/85 1985-06-04

Publications (4)

Publication Number Publication Date
EP0204290A2 EP0204290A2 (en) 1986-12-10
EP0204290A3 EP0204290A3 (en) 1987-05-27
EP0204290B1 true EP0204290B1 (en) 1989-11-02
EP0204290B2 EP0204290B2 (en) 1993-09-15

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EP86107426A Expired - Lifetime EP0204290B2 (en) 1985-06-04 1986-06-02 A sheetmetal rolling machine for making a conical shell from a sheetmetal blank

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US (1) US4735076A (en)
EP (1) EP0204290B2 (en)
AT (1) ATE47676T1 (en)
DE (1) DE3666673D1 (en)

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JP6020515B2 (en) * 2014-05-30 2016-11-02 トヨタ自動車株式会社 Sub-muffler outer cylinder manufacturing method and manufacturing apparatus
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CN116037729B (en) * 2023-03-07 2023-06-27 广州高谱机械科技有限公司 Anti-deformation mechanism for bending profile and bending equipment formed by anti-deformation mechanism
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US3016082A (en) * 1957-05-10 1962-01-09 Whiteley Read Engineers Ltd Roll bending machines for curving plate members
US3091279A (en) * 1960-05-04 1963-05-28 Lockheed Aircrat Corp Method and apparatus for forming conically shaped articles
US3459020A (en) * 1965-02-01 1969-08-05 Hitachi Shipbuilding Eng Co Plate-bending roll for steel plates and the like
US3505852A (en) * 1968-03-07 1970-04-14 Bend Rite Inc Tube bending machine
CH494604A (en) * 1968-08-10 1970-08-15 Haeusler Christian Round machine for producing a cone from sheet metal in the shape of a circular ring segment
US4195509A (en) * 1976-06-12 1980-04-01 Hinrichs Gesellschaft Mit Beschrankter Haftung Device for bending ring segment-shaped plate blanks into conically shaped parts
DE2847965C2 (en) * 1978-11-04 1980-12-11 Schaefer Maschbau Wilhelm Four roll bending machine

Also Published As

Publication number Publication date
US4735076A (en) 1988-04-05
EP0204290B2 (en) 1993-09-15
EP0204290A2 (en) 1986-12-10
EP0204290A3 (en) 1987-05-27
DE3666673D1 (en) 1989-12-07
ATE47676T1 (en) 1989-11-15

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