EP0767016A2 - Method and apparatus for measuring the radius of bent products - Google Patents

Method and apparatus for measuring the radius of bent products Download PDF

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Publication number
EP0767016A2
EP0767016A2 EP96115724A EP96115724A EP0767016A2 EP 0767016 A2 EP0767016 A2 EP 0767016A2 EP 96115724 A EP96115724 A EP 96115724A EP 96115724 A EP96115724 A EP 96115724A EP 0767016 A2 EP0767016 A2 EP 0767016A2
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Prior art keywords
guide
roller
slide
bending
curvature
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EP96115724A
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German (de)
French (fr)
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EP0767016B1 (en
EP0767016A3 (en
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Alois Adelhof
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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
    • B21D7/00—Bending rods, profiles, or tubes
    • B21D7/14—Bending rods, profiles, or tubes combined with measuring of bends or lengths
    • 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
    • B21D7/00—Bending rods, profiles, or tubes
    • B21D7/08—Bending rods, profiles, or tubes by passing between rollers or through a curved die

Definitions

  • the invention relates to a method for determining radii in the case of bent parts which determine two cylinder surfaces, an inner cylinder surface facing a center of curvature and a second outer cylinder surface facing away from it.
  • the invention also relates to a device which is particularly suitable for this method.
  • a portable device for bending pipes can be found, for example, in DE-PS 32 09 539.
  • the curvature can be measured, for example, by hand using a three-point measuring device.
  • the cylinder surface facing the center point has an arc length which is smaller in proportion to the curvature and the object width than the other equidistantly curved cylinder surface facing away from the center point. It is true that radii of curved objects can be determined, for example, using the so-called three-point measuring method, strain gauges and measuring methods in which - touching or without contact - several points of a contour are detected and the radius is calculated therefrom; however, many of these methods are either relatively imprecise or tied to constraints that are difficult to meet in practice.
  • the inventor has set himself the goal of developing a measuring method and a device for this, with the aid of which the radius of the arc of bent parts can be determined by means of fewer and easily ascertainable geometric sizes.
  • the length of the radius of the inner cylinder surface closer to the center of curvature is determined as a quotient from the radial distance between the two cylinder surfaces as a dividend and a divisor which is the difference of the quotient of the arc length of the outer cylinder surface by the arc length of the inner cylinder surface minus the subtrahend 1.
  • the three geometric variables are determined by means of two - preferably identical - friction wheel rotary encoder units which are arranged opposite one another; each of these units is mounted on a separate slide, and both slides can be moved independently on a common linear guide.
  • a force accumulator in particular a compression spring, is assigned to each of these slides. Thanks to this provision, the friction wheels are continuously in contact with the bent object; this is located between the two friction wheels described. That continuous installation of the friction wheels is supported by the proviso that the compression spring of the outer slide is equipped with a higher force than the compression spring of the inner slide.
  • the arc lengths can be measured without a radial alignment of the guide bar when bending in several forming stages. Since the position of the bent part relative to the friction wheel encoder units remains constant during a forming step, two arc lengths belonging together are measured, which enable a determination of the radius.
  • three sensors record the following values: the arc length La of the outer side surface 12; the arc length Li of the inner side surface 14 such as the mentioned rod width b as the radial distance of the arc lengths La, Li from each other.
  • the three geometric variables are recorded in such a way that the arc lengths La, Li are determined by means of an outer and an inner friction wheel rotary encoder 16 and 18, and the distance b between the two cylinder or side surfaces 12, 14 is determined by a potentiometric displacement sensor will.
  • the friction wheel rotary encoders 16, 18 are located on two slides 20, 20 i , which can move independently of one another on a linear guide 22 oriented radially to the arc segment.
  • a continuous application of the friction wheels 17 of that friction wheel encoder units 16,18 at those side faces 12,14 is achieved i with two compression springs 24,24, the i are supported in each case at one end to the carriage 24 and 24 respectively. Since the outer compression spring 24 exerts a higher force on its slide 20 than the inner compression spring 24 i on the inner slide 20 i , a continuous application of guide rollers 26 on the curved rod 10 is achieved at the same time.
  • the guide rollers 26 are fixed at the ends of two side arms of a guide tree 30 which is T-shaped in plan view and whose central bar forms that linear guide 22, each of which is offered by a part of a guide bar 28.
  • the necessary radial alignment thereof is achieved with the guide beam 28 projecting at right angles from it, from the free ends of which a bearing arm 32 for those guide rollers 26, which is parallel to the linear guide, projects.
  • the exemplary embodiment in FIG. 2 shows the measuring device for detecting the two arc lengths of the bent part integrated in a typical three-roll bending machine with bending rolls 35 to 37.
  • the main difference from the embodiment in FIG. 1 is that the measuring unit in FIG. 2 does not have a guide bar 22 with guide rollers 26 which, in the other embodiment, ensures the continuous radial alignment of the measuring unit on the bent part.
  • the common linear guide 22 is attached to the machine body after prior alignment either in adjustable - or non-adjustable - steps.
  • the linear guide 22 can either be seen behind the bending roller 37 or even just before the bending roller 37 in the feed direction x, ie it can be positioned in the space between the central roller 35 and the bending roller 37.
  • the bending roller 37 is fed during bending processes in which the finished contour of the bent part is produced in several steps so that the distance between the bending roller 37 and the central roller 35 is reduced.
  • the bending radius changes from Ri to Ro ⁇ Ri.
  • the arrangement of the bent part remains relative to that during the rest of the bending process Bending rolls 35 to 37 and in particular unchanged to the measuring unit.
  • the associated arc lengths La and Li are recorded with the unit shown, without this unit having to be aligned radially on the bent part.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • A Measuring Device Byusing Mechanical Method (AREA)
  • Length Measuring Devices With Unspecified Measuring Means (AREA)

Abstract

The method involves using components (10) having two cylindrical surfaces. An inner surface (14) faces a centre of curvature, a second surface (12) faces away from it. The length of the radius (Ri) of the inner surface is calculated as a ratio, from the radial distance (b) of both cylindrical surface forming the dividend and a divisor. The divisor is the difference of the quotient of the curvature length (La) of the outer surface, divided by the length (Li) of the inner surface, minus 1. The radial distance (b) between the cylinder surfaces is measured after measuring of the curvature length, at least one of which is measured contact-free.

Description

Die Erfindung betrifft ein Verfahren zum Feststellen von Radien bei -- zwei Zylinderflächen bestimmenden -- Biegeteilen, wobei eine innere Zylinderfläche einem Krümmungsmittelpunkt zugewandt sowie eine zweite -- äußere -- Zylinderfläche diesem abgewandt ist. Zudem erfaßt die Erfindung eine für dieses Verfahren besonders geeignete Vorrichtung.The invention relates to a method for determining radii in the case of bent parts which determine two cylinder surfaces, an inner cylinder surface facing a center of curvature and a second outer cylinder surface facing away from it. The invention also relates to a device which is particularly suitable for this method.

Eine tragbare Vorrichtung zum Biegen von Rohren ist beispielhaft der DE-PS 32 09 539 zu entnehmen. Eine Messung der Krümmung kann beispielsweise von Hand mittels eines Dreipunktmeßgerätes erfolgen.A portable device for bending pipes can be found, for example, in DE-PS 32 09 539. The curvature can be measured, for example, by hand using a three-point measuring device.

Bei einem segmentförmigen Ausschnitt eines derart gekrümmten Gegenstandes mit konstantem Radius weist die dem Mittelpunkt zugewandte Zylinderfläche eine der Krümmung und der Gegenstandsbreite proportional kleinere Bogenlänge auf als die andere -- dem Mittelpunkt abgewandte -- äquidistant gekrümmte Zylinderfläche. Zwar lassen sich Radien gekrümmter Gegenstände beispielsweise mit der sog. Dreipunktmeßmethode, mit Dehnungsmeßstreifen sowie mit Meßverfahren feststellen, bei denen -- berührend oder berührungslos -- mehrere Punkte einer Kontur erfaßt und daraus der Radius errechnet wird; jedoch sind viele dieser Methoden entweder relativ ungenau oder an Randbedingungen gebunden, die in der Praxis kaum einzuhalten sind.In the case of a segment-shaped section of an object of this type curved with a constant radius, the cylinder surface facing the center point has an arc length which is smaller in proportion to the curvature and the object width than the other equidistantly curved cylinder surface facing away from the center point. It is true that radii of curved objects can be determined, for example, using the so-called three-point measuring method, strain gauges and measuring methods in which - touching or without contact - several points of a contour are detected and the radius is calculated therefrom; however, many of these methods are either relatively imprecise or tied to constraints that are difficult to meet in practice.

In Kenntnis dieses Standes der Technik hat sich der Erfinder das Ziel gesetzt, ein Meßverfahren und eine Vorrichtung dazu zu entwickeln, mit deren Hilfe der Radius des Bogens von Biegeteilen mittels weniger und einfach erfaßbarer geometrischer Größen bestimmt zu werden vermag.Knowing this state of the art, the inventor has set himself the goal of developing a measuring method and a device for this, with the aid of which the radius of the arc of bent parts can be determined by means of fewer and easily ascertainable geometric sizes.

Zur Lösung dieser Aufgabe führt die Lehre des unabhängigen Patentanspruches, die Unteransprüche geben günstige Weiterbildungen an.The teaching of the independent claim leads to the solution of this task, the subclaims indicate favorable further developments.

Erfindungsgemäß wird die Länge des Radius der dem Krümmungsmittelpunkt näherliegenden inneren Zylinderfläche als Quotient aus dem radialen Abstand der beiden Zylinderflächen als Divident und einen Divisor bestimmt, der die Differenz des Quotienten der Bogenlänge der äußeren Zylinderfläche durch die Bogenlänge der inneren Zylinderfläche abzüglich des Subtrahenden 1 ist. Dazu werden durch drei Meßwertaufnehmer die folgenden Größen erfaßt: die Bogenlänge La der äußeren Zylinderfläche, die Bogenlänge Li der inneren Zylinderfläche sowie der radiale Abstand der beiden Zylinderflächen voneinander. Dadurch läßt sich mittels der nachstehenden Formel der Radius Ri des inneren Bogens berechnen: Ri = b/((La/Li)- 1).

Figure imgb0001
According to the invention, the length of the radius of the inner cylinder surface closer to the center of curvature is determined as a quotient from the radial distance between the two cylinder surfaces as a dividend and a divisor which is the difference of the quotient of the arc length of the outer cylinder surface by the arc length of the inner cylinder surface minus the subtrahend 1. For this purpose, the following variables are recorded by three sensors: the arc length La of the outer cylinder surface, the arc length Li of the inner cylinder surface and the radial distance between the two cylinder surfaces. This allows the radius Ri of the inner arc to be calculated using the following formula: Ri = b / ((La / Li) - 1).
Figure imgb0001

Die Bestimmung der drei geometrischen Größen erfolgt mittels zweier -- bevorzugt baugleicher -- Reibrad-DrehgeberEinheiten, welche einander gegenüber angeordnet sind; jede dieser Einheiten ist auf einem gesonderten Schlitten montiert, und beide Schlitten können voneinander unabhängig auf einer gemeinsam Linearführung bewegt werden. Jedem dieser Schlitten ist ein Kraftspeicher, insbesondere eine Druckfeder, zugeordnet. Dank dieser Maßgabe ist eine kontinuierliche Anlage der Reibräder am gebogenen Gegenstand gewährleistet; dieser befindet sich zwischen den beiden geschilderten Reibrädern. Jene kontinuierliche Anlage der Reibräder wird noch durch die Maßgabe unterstützt, daß die Druckfeder des äußeren Schlittens mit einer höheren Kraft ausgestattet ist als die Druckfeder des inneren Schlittens.The three geometric variables are determined by means of two - preferably identical - friction wheel rotary encoder units which are arranged opposite one another; each of these units is mounted on a separate slide, and both slides can be moved independently on a common linear guide. A force accumulator, in particular a compression spring, is assigned to each of these slides. Thanks to this provision, the friction wheels are continuously in contact with the bent object; this is located between the two friction wheels described. That continuous installation of the friction wheels is supported by the proviso that the compression spring of the outer slide is equipped with a higher force than the compression spring of the inner slide.

Im Rahmen der Erfindung liegt es, den Abstand zwischen den Zylinderflächen mit einem an sich bekannten Wegaufnehmer in einer Biegemaschine oder außerhalb dieser -- beispielsweise mit einem Handmeßgerät -- am gebogenen Teil gemessen wird.It is within the scope of the invention to measure the distance between the cylinder surfaces with a displacement transducer known per se in a bending machine or outside it - for example with a hand-held measuring device - on the bent part.

Als günstig hat es sich erwiesen, die Linearführung mit einem zu ihr rechtwinkelig angeordneten Führungsbalken zu verbinden und an den freien Enden des Führungsbalkens jeweils eine Führungsrolle vorzusehen. Diese kann bei einem besonderen Ausführungsbeispiel an einem Tragarm des Führungsbalkens gelagert sein.It has proven to be advantageous to connect the linear guide to a guide bar arranged at right angles to it and to provide a guide roller at the free ends of the guide bar. In a special embodiment, this can be mounted on a support arm of the guide beam.

Von Bedeutung für das erfindungsgemäße Verfahren ist zudem, daß beim Biegen in mehreren Umformstufen die Bogenlängen auch ohne eine radiale Ausrichtung des Führungsbalkens gemessen werden können. Da während einer Umformstufe die Lage des Biegeteils relativ zu den Reibrad-Drehgebereinheiten konstant bleibt, werden zwei zusammengehörende Bogenlängen gemessen, die eine Radienbestimmung ermöglichen.It is also important for the method according to the invention that the arc lengths can be measured without a radial alignment of the guide bar when bending in several forming stages. Since the position of the bent part relative to the friction wheel encoder units remains constant during a forming step, two arc lengths belonging together are measured, which enable a determination of the radius.

Im Rahmen der Erfindung liegt es auch, den Abstand zwischen den Schlitten durch einen Wegaufnehmer zu erfassen; dieser Abstand entspricht der Breite des gebogenen Gegenstandes.It is also within the scope of the invention to detect the distance between the slides using a displacement transducer; this distance corresponds to the width of the curved object.

Weitere Vorteile, Merkmale und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung bevorzugter Ausführungsbeispiele sowie anhand der Zeichnung; diese zeigt in ihren beiden Figuren schematische Draufsichten auf eine erfindungsgemäße Vorrichtung.Further advantages, features and details of the invention result from the following description of preferred exemplary embodiments and from the drawing; in its two figures, this shows schematic top views of a device according to the invention.

Bei einem durch Biegeumformung eines geraden Profils gebogenen Stab 10 entspricht die Entfernung von dessen äußerer Seitenfläche 12 zu dem in der Zeichnung nicht erkennbaren Krümmungsmittelpunkt der Summe aus der Stabbreite b und dem inneren Biegeradius Ri, also der Entfernung der inneren Seitenfläche 14 zu jenem Krümmungsmittelpunkt. Jede der beiden Seitenflächen 12,14 bestimmt einen von zwei zueinander äquidistanten Zylinderflächenabschnitten.In the case of a rod 10 bent by bending a straight profile, the distance from its outer side surface 12 to the center of curvature, which cannot be seen in the drawing, corresponds to the sum of the rod width b and the inner bending radius Ri, that is to say the distance from the inner side surface 14 to that center of curvature. Each of the two side surfaces 12, 14 determines one of two mutually equidistant cylindrical surface sections.

Zum Festlegen des inneren Biegeradius Ri erfassen drei Meßwertaufnehmer die folgenden Größen:
   die Bogenlänge La der äußeren Seitenfläche 12;
   die Bogenlänge Li der inneren Seitenfläche 14
   sowie
   die erwähnte Stabbreite b als radialen Abstand der Bogenlängen La,Li voneinander.To determine the inner bending radius Ri, three sensors record the following values:
the arc length La of the outer side surface 12;
the arc length Li of the inner side surface 14
such as
the mentioned rod width b as the radial distance of the arc lengths La, Li from each other.

Mit Hilfe der folgenden Formel läßt sich dann beispielsweise der Radius Ri des inneren Bogens berechnen: Ri = b/((La/Li)- 1).

Figure imgb0002
The radius Ri of the inner arc can then be calculated using the following formula: Ri = b / ((La / Li) - 1).
Figure imgb0002

Die Erfassung der drei geometrischen Größen wird in der Weise vorgenommen, daß die Bogenlängen La, Li mittels eines äußeren und eines inneren Reibrad-Drehgebers 16 bzw. 18 sowie der Abstand b zwischen den beiden Zylinder- oder Seitenflächen 12,14 durch einen potentiometrischen Wegaufnehmer festgestellt werden.The three geometric variables are recorded in such a way that the arc lengths La, Li are determined by means of an outer and an inner friction wheel rotary encoder 16 and 18, and the distance b between the two cylinder or side surfaces 12, 14 is determined by a potentiometric displacement sensor will.

Die Reibrad-Drehgeber 16,18 befinden sich auf zwei Schlitten 20,20i, die sich unabhängig voneinander auf einer radial zum Bogensegment ausgerichteten Linearführung 22 bewegen können. Ein kontinuierliches Anlegen der Reibräder 17 jener Reibrad-Drehgeber-Einheiten 16,18 an jenen Seitenflächen 12,14 wird mit zwei Druckfedern 24,24i erreicht, die sich jeweils einends am Schlitten 24 bzw. 24i abstützen. Da die äußere Druckfeder 24 eine höhere Kraft auf ihren Schlitten 20 ausübt als die innere Druckfeder 24i auf den inneren Schlitten 20i, wird gleichzeitig ein kontinuierliches Anlegen von Führungsrollen 26 am gekrümmten Stab 10 erreicht.The friction wheel rotary encoders 16, 18 are located on two slides 20, 20 i , which can move independently of one another on a linear guide 22 oriented radially to the arc segment. A continuous application of the friction wheels 17 of that friction wheel encoder units 16,18 at those side faces 12,14 is achieved i with two compression springs 24,24, the i are supported in each case at one end to the carriage 24 and 24 respectively. Since the outer compression spring 24 exerts a higher force on its slide 20 than the inner compression spring 24 i on the inner slide 20 i , a continuous application of guide rollers 26 on the curved rod 10 is achieved at the same time.

Die Führungsrollen 26 sind an den Enden zweier -- jeweils von einem Teil eines Führungsbalkens 28 angebotener -- Seitenarme eines in Draufsicht T-förmigen Führungsbaumes 30 festgelegt, dessen Mittelbalken jene Linearführung 22 bildet. Deren notwendige radiale Ausrichtung wird mit dem von ihr rechtwinkelig abstehenden Führungsbalken 28 erreicht, von dessen freien Enden jeweils ein -- zur Linearführung paralleler -- Lagerarm 32 für jene Führungsrollen 26 abragt.The guide rollers 26 are fixed at the ends of two side arms of a guide tree 30 which is T-shaped in plan view and whose central bar forms that linear guide 22, each of which is offered by a part of a guide bar 28. The necessary radial alignment thereof is achieved with the guide beam 28 projecting at right angles from it, from the free ends of which a bearing arm 32 for those guide rollers 26, which is parallel to the linear guide, projects.

Das Ausführungsbeispiel der Fig. 2 zeigt die Meßvorrichtung zum Erfassen der beiden Bogenlängen des Biegeteils integriert in eine typische Drei-Rollen-Biegemaschine mit Biegerollen 35 bis 37. Der wesentliche Unterschied zur Ausführung der Fig. 1 besteht darin, daß die Meßeinheit in Fig. 2 keinen Führungsbalken 22 mit Führungsrollen 26 aufweist, der bei der anderen Ausführung für die kontinuierliche radiale Ausrichtung der Meßeinheit auf dem Biegeteil sorgt. Statt dessen wird die gemeinsame Linearführung 22 am Maschinenkorpus nach vorherigem Ausrichten entweder in Stufen verstellbar -- oder nicht verstellbar -- befestigt.The exemplary embodiment in FIG. 2 shows the measuring device for detecting the two arc lengths of the bent part integrated in a typical three-roll bending machine with bending rolls 35 to 37. The main difference from the embodiment in FIG. 1 is that the measuring unit in FIG. 2 does not have a guide bar 22 with guide rollers 26 which, in the other embodiment, ensures the continuous radial alignment of the measuring unit on the bent part. Instead, the common linear guide 22 is attached to the machine body after prior alignment either in adjustable - or non-adjustable - steps.

Dabei kann die Linearführung 22 entweder hinter der Biegerolle 37 oder sogar kurz vor der Biegerolle 37 in Vorschubrichtung x gesehen, d.h. in dem Raum zwischen Mittelrolle 35 und Biegerolle 37 positioniert werden.The linear guide 22 can either be seen behind the bending roller 37 or even just before the bending roller 37 in the feed direction x, ie it can be positioned in the space between the central roller 35 and the bending roller 37.

Nachdem das Biegeteil im ersten Umformschritt auf den Radius Ri gebogen wurde, erfolgt bei Biegevorgängen, bei denen in mehreren Schritten die fertige Kontur des Biegeteils erzeugt wird, eine Zustellung der Biegerolle 37 so, daß sich der Abstand zwischen Biegerolle 37 und Mittelrolle 35 verringert.After the bent part has been bent to the radius Ri in the first forming step, the bending roller 37 is fed during bending processes in which the finished contour of the bent part is produced in several steps so that the distance between the bending roller 37 and the central roller 35 is reduced.

Wenn danach das auf Ri gebogene Teil durch den Antrieb der Rollen 35 bis 37 eine Bewegung in x-Richtung erfährt, verändert sich der Biegeradius von Ri auf Ro < Ri. Nach einer kurzen Anlaufphase bleibt die Anordnung des Biegeteils während des restlichen Biegevorganges relativ zu den Biegerollen 35 bis 37 und insbesondere zu der Meßeinheit unverändert. Bei einem Meßvorgang, der nach der Anlaufphase beginnt, werden die zugehörigen Bogenlängen La und Li mit der dargestellten Einheit erfaßt, ohne daß diese Einheit radial auf dem Biegeteil ausgerichtet sein muß.If the part bent on Ri is then moved in the x direction by the drive of rollers 35 to 37, the bending radius changes from Ri to Ro <Ri. After a short start-up phase, the arrangement of the bent part remains relative to that during the rest of the bending process Bending rolls 35 to 37 and in particular unchanged to the measuring unit. In a measurement process that begins after the start-up phase, the associated arc lengths La and Li are recorded with the unit shown, without this unit having to be aligned radially on the bent part.

Claims (17)

Verfahren zum Feststellen von Radien bei zwei Zylinderflächen bestimmenden Biegeteilen (10), wobei eine innere Zylinderfläche (14) einem Krümmungsmittelpunkt zugewandt sowie eine zweite Zylinderfläche (12) diesem abgewandt ist,
dadurch gekennzeichnet,
daß die Länge des Radius (Ri) der dem Krümmungsmittelpunkt näherliegenden inneren Zylinderfläche (14) als Quotient aus dem radialen Abstand (b) der beiden Zylinderflächen (14,12) als Divident und einem Divisor bestimmt wird, der die Differenz des Quotienten der Bogenlänge (La) der äußeren Zylinderfläche durch die Bogenlänge (Li) der inneren Zylinderfläche abzüglich des Subtrahenden 1 ist.Method for determining radii in the case of bent parts (10) determining two cylinder surfaces, an inner cylinder surface (14) facing a center of curvature and a second cylinder surface (12) facing away from it,
characterized,
that the length of the radius (Ri) of the inner cylinder surface (14) closer to the center of curvature is determined as a quotient from the radial distance (b) of the two cylinder surfaces (14, 12) as a dividend and a divisor that determines the difference of the quotient of the arc length ( La) of the outer cylinder surface by the arc length (Li) of the inner cylinder surface minus the subtrahend 1. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der radiale Abstand (b) zwischen den Zylinderflächen (12,14) nach dem Erfassen der Bogenlängen (Li,La) gemessen wird.Method according to Claim 1, characterized in that the radial distance (b) between the cylinder surfaces (12, 14) is measured after the arc lengths (Li, La) have been detected. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Bogenlängen (Li,La) beim Biegen in mehreren Umformstufen unabhängig von der radialen Ausrichtung gemessen werden.A method according to claim 1 or 2, characterized in that the arc lengths (Li, La) are measured during bending in several forming stages independently of the radial orientation. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß wenigstens eine der Bogenlängen (Li, La) berührungslos gemessen werden.Method according to one of claims 1 to 3, characterized in that at least one of the arc lengths (Li, La) are measured without contact. Vorrichtung zur Durchführung des Meßverfahrens nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß zwei Reibrad-Drehgeber-Einheiten (16,18) eine Durchgangsöffnung für das Biegeteil (10) bestimmen, wobei jede der Reibrad-Drehgeber-Einheiten auf einem Schlitten (20,20i) angeordnet und beide Schlitten auf einer gemeinsamen Linearführung (22) verschieblich sind.Device for carrying out the measuring method according to one of claims 1 to 4, characterized in that two friction wheel encoder units (16, 18) determine a through opening for the bent part (10), each of the friction wheel encoder units on a slide ( 20, 20i) and both carriages can be moved on a common linear guide (22). Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, daß sich jeder Schlitten (20,20i) an seiner dem Biegeteil (10) abgekehrten Seite gegen einen Kraftspeicher (24,24i) abstützt.Device according to claim 5, characterized in that each slide (20, 20i) is supported on its side facing away from the bent part (10) against an energy store (24, 24i). Vorrichtung nach Anspruch 5 oder 6, dadurch gekennzeichnet, daß die Linearführung (22) Teil eines Führungsbaumes (30) ist und dieser einen ihn querenden Führungsbalken (28) enthält, an dessen freien Enden jeweils eine Führungsrolle (26) für das Biegeteil angeordnet ist.Apparatus according to claim 5 or 6, characterized in that the linear guide (22) is part of a guide tree (30) and this contains a guide bar (28) crossing it, at the free ends of which a guide roller (26) is arranged for the bent part. Vorrichtung nach einem der Ansprüche 5 bis 7, dadurch gekennzeichnet, daß der Führungsbalken (28) in sich gekrümmt ist.Device according to one of claims 5 to 7, characterized in that the guide bar (28) is curved in itself. Vorrichtung nach einem der Ansprüche 5 bis 7, dadurch gekennzeichnet, daß der Führungsbalken (28) zur Linearführung (22) rechtwinkelig ausgebildet ist.Device according to one of claims 5 to 7, characterized in that the guide bar (28) for the linear guide (22) is formed at right angles. Vorrichtung nach einem der Ansprüche 7 bis 9, dadurch gekennzeichnet, daß von den freien Enden des Führungsbalkens (28) jeweils ein Tragarm (32) für eine Führungsrolle (26) abragt.Device according to one of claims 7 to 9, characterized in that a support arm (32) for a guide roller (26) projects from the free ends of the guide bar (28). Vorrichtung nach Anspruch 10, dadurch gekennzeichnet, daß der Tragarm (32) zur Linearführung (22) etwa parallel verläuft.Apparatus according to claim 10, characterized in that the support arm (32) runs approximately parallel to the linear guide (22). Vorrichtung nach wenigstens einem der Ansprüche 5 bis 11, dadurch gekennzeichnet, daß der Kraftspeicher des radial außenliegenden Schlittens (20) mit einer größeren Kraft versehen ist als der Kraftspeicher (24i) des radial innenliegenden Schlittens (20i).Device according to at least one of claims 5 to 11, characterized in that the energy accumulator of the radially outer slide (20) is provided with a greater force than the energy accumulator (24 i ) of the radially inner slide (20 i ). Vorrichtung nach wenigstens einem der Ansprüche 5 bis 12, gekennzeichnet durch einen Wegaufnehmer zur Aufnahme des Abstandes (b) zwischen den Schlitten (20,20i) bzw. den Zylinderflächen (12,14) des Biegeteils (10).Device according to at least one of claims 5 to 12, characterized by a displacement transducer for recording the distance (b) between the slide (20, 20 i ) or the cylinder surfaces (12, 14) of the bent part (10). Vorrichtung nach einem der Ansprüche 1 bis 13, dadurch gekennzeichnet, daß den Schlitten (20, 20i) in Förderrichtung (x) beidseits der Bewegungsbahn für den Strang (10) der Umfang wenigstens einer Rolle (35, 36, 37) vorgeordnet ist.Device according to one of claims 1 to 13, characterized in that the circumference of at least one roller (35, 36, 37) is arranged upstream of the slides (20, 20 i ) in the conveying direction (x) on both sides of the path of movement for the strand (10). Vorrichtung nach einem der Ansprüche 1 bis 14, dadurch gekennzeichnet, daß die gemeinsame Längsführung (22) mit den Schlitten (20, 20i) in dem Raum zwischen einer Mittelrolle (35) und einer Biegerolle (37) angeordnet ist, bevorzugt in Vorschubrichtung (x) kurz vor der Biegerolle.Device according to one of claims 1 to 14, characterized in that the common longitudinal guide (22) with the slides (20, 20 i ) is arranged in the space between a central roller (35) and a bending roller (37), preferably in the feed direction ( x) shortly before the bending roll. Vorrichtung nach Anspruch 14 oder 15, dadurch gekennzeichnet, daß an der Krümmungsinnenseite des Stranges (10) eine Mittelrolle (35) vorgesehen ist, der an der Krümmungsaußenseite eine Führungsrolle (36) sowie eine schlittennahe Biegerolle (37) gegenüberliegen.Apparatus according to claim 14 or 15, characterized in that a central roller (35) is provided on the inside of the curvature of the strand (10), which is opposite a guide roller (36) and a bending roller (37) close to the slide on the outside of the curve. Vorrichtung nach einem der Ansprüche 14 bis 16, dadurch gekennzeichnet, daß die Führungsrolle (36) und die Biegerolle (37) auf unterschiedlichen Seiten einer durch den Mittelpunkt (M) der Mittelrolle (35) gelegten diametralen Mittelachse (Q) angeordnet sind.Device according to one of claims 14 to 16, characterized in that the guide roller (36) and the bending roller (37) are arranged on different sides of a diametrical central axis (Q) through the center (M) of the central roller (35).
EP19960115724 1995-10-04 1996-10-01 Method and apparatus for measuring the radius of bent products Expired - Lifetime EP0767016B1 (en)

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ITRM20090215A1 (en) * 2009-05-06 2010-11-07 Cml Int Spa MACHINE TO TURN CONTINUOUSLY AN EXTENDED PIECE ACCORDING TO PREDETERMINATED RAYS
ITMI20101124A1 (en) * 2010-06-22 2011-12-23 Crippa Spa PROCEDURE FOR THE BENDING OF TUBES, WIRES OR TAPES OF METAL A SERPENTINA OR SPRING AND CURVED MACHINE TUBES, WIRES OR METAL TAPES FOR THE MANUFACTURE OF A SERPENTINE OR A SPRING PRESENTING A PERFORMANCE WITH A PROPELLER INCLUDING A PLURALITY
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CN113884958A (en) * 2021-09-27 2022-01-04 中国科学院合肥物质科学研究院 Device and method for measuring critical side bending radius of superconducting tape

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DE102020127164B3 (en) 2020-10-15 2021-07-15 Jenoptik Industrial Metrology Germany Gmbh Radial force device for a contour measuring device and measuring system

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EP2248611A1 (en) * 2009-05-06 2010-11-10 CML International S.P.A. A machine for continuously bending an elongated workpiece at predetermined radii
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ITMI20101124A1 (en) * 2010-06-22 2011-12-23 Crippa Spa PROCEDURE FOR THE BENDING OF TUBES, WIRES OR TAPES OF METAL A SERPENTINA OR SPRING AND CURVED MACHINE TUBES, WIRES OR METAL TAPES FOR THE MANUFACTURE OF A SERPENTINE OR A SPRING PRESENTING A PERFORMANCE WITH A PROPELLER INCLUDING A PLURALITY
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EP2873943A2 (en) 2013-11-19 2015-05-20 CTE Sistemi S.r.l. Measuring unit for measuring the bending radius and the forwarding of a workpiece in a bending machine
JP2015098053A (en) * 2013-11-19 2015-05-28 チティエ スィステミ ソシエタ アレスポンサビリタ リミタータ Measuring unit for measuring bending radius and forwarding of workpiece in bending machine
EP2873943A3 (en) * 2013-11-19 2015-08-12 CTE Sistemi S.r.l. Measuring unit for measuring the bending radius and the forwarding of a workpiece in a bending machine
EP3051251A1 (en) * 2013-11-19 2016-08-03 CTE Sistemi S.r.l. Measuring unit for measuring the forwarding of a workpiece in a bending machine
CN104646451B (en) * 2013-11-19 2018-05-04 Cte斯特米股份责任有限公司 Measuring unit
US10092937B2 (en) 2013-11-19 2018-10-09 Cte Sistemi S.R.L. Measuring unit for measuring the bending radius and the forwarding of a workpiece in a bending machine
EP3540366A1 (en) * 2013-11-19 2019-09-18 CTE Sistemi S.r.l. Measuring unit for measuring the forwarding of a workpiece in a bending machine
RU2705047C2 (en) * 2013-11-19 2019-11-01 СиТиЭ СИСТЕМИ С.р.л. Measuring device for measuring radius of bending and billet feeding in bending machine
CN113884958A (en) * 2021-09-27 2022-01-04 中国科学院合肥物质科学研究院 Device and method for measuring critical side bending radius of superconducting tape
CN113884958B (en) * 2021-09-27 2023-07-25 中国科学院合肥物质科学研究院 Device and method for measuring critical lateral bending radius of superconducting strip

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