EP0215006B1 - Device for bending conical wires - Google Patents

Device for bending conical wires Download PDF

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Publication number
EP0215006B1
EP0215006B1 EP85905317A EP85905317A EP0215006B1 EP 0215006 B1 EP0215006 B1 EP 0215006B1 EP 85905317 A EP85905317 A EP 85905317A EP 85905317 A EP85905317 A EP 85905317A EP 0215006 B1 EP0215006 B1 EP 0215006B1
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EP
European Patent Office
Prior art keywords
wire
section
diameter
bending
slide
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP85905317A
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German (de)
French (fr)
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EP0215006A1 (en
Inventor
Ralf Fangmeier
Reiner Glomb
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TH Kieserling and Albrecht GmbH and Co
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TH Kieserling and Albrecht GmbH and Co
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Priority to AT85905317T priority Critical patent/ATE56377T1/en
Publication of EP0215006A1 publication Critical patent/EP0215006A1/en
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Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C47/00—Winding-up, coiling or winding-off metal wire, metal band or other flexible metal material characterised by features relevant to metal processing only
    • B21C47/02—Winding-up or coiling
    • B21C47/04—Winding-up or coiling on or in reels or drums, without using a moving guide
    • B21C47/045—Winding-up or coiling on or in reels or drums, without using a moving guide in rotating drums
    • 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
    • B21D11/00—Bending not restricted to forms of material mentioned in only one of groups B21D5/00, B21D7/00, B21D9/00; Bending not provided for in groups B21D5/00 - B21D9/00; Twisting
    • B21D11/06—Bending into helical or spiral form; Forming a succession of return bends, e.g. serpentine form
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21F—WORKING OR PROCESSING OF METAL WIRE
    • B21F3/00—Coiling wire into particular forms
    • B21F3/02—Coiling wire into particular forms helically

Definitions

  • the invention relates to a method for bending conical wires according to. the preamble of claim 1 and a device for performing the method according to the preamble of claim 4.
  • Bending devices of the generic type which can also be used for wires.
  • a straight wire is inserted into the device, bent into a circle and placed on a turntable, reel or the like, where it forms a coil of wire.
  • Such devices fail if the wire does not have a constant cross-section, e.g. is the case for wires for coil springs with progressive or degressive spring characteristic.
  • wire for e.g. Coil springs with a progressive spring characteristic that is only later divided into longitudinal sections that are required to wind the individual springs.
  • a wire varying between 2 or more longitudinal sections with different cross sections leads to flower-shaped wire structures which are only poorly suited for transport and further processing. This wire with alternately smaller and larger diameters is preferably produced by peeling.
  • JP-A-54 148 162 a method for the bending winding of sheet metal strip which is wound up into the coil is known.
  • the sheet metal strip is bent onto the winding curvature in a trio of bending rolls.
  • the bending rolls are computer controlled.
  • the sheet thickness is recorded before bending.
  • the curvature to be imparted to the sheet metal strip changes with the outside diameter of the coil to be wound up, which is calculated from the feed speed and the thickness of the sheet metal. From this, the required curvature of the sheet metal strip is determined and set on the bending roller on the outlet side. The curvature of the sheet metal strip is continuously calculated and changed.
  • the disadvantage here is the high control effort for setting the required curvature of the sheet metal strip.
  • the known solution is unsuitable for double conical spring wires.
  • a bending winding device which winds straight into a roll trio tube into a neatly layered coil.
  • the middle of the 3 rollers, the bending roller is adjusted by a motor.
  • the adjustment is made via a roller that scans the resulting curvature on the outlet side and, if necessary, uses an electrical contact to adjust the bending roller.
  • the tube changes its cross-section within the scope of the manufacturing tolerances and the adjustment of the bending roller serves to compensate for the fluctuations in curvature caused by the cross-sectional tolerances in a trio of bending rollers. Disadvantages here are again the high adjustment effort for the control loop and the hardware effort for the control loop.
  • the invention has for its object to find a simple solution with which wires with a cross-section varying in length between a large and a small diameter can be wound into annular coils.
  • a delay module e.g. a throttle can be provided in the hydraulic system, which extends the switching process over time. This prevents a kink in the wire.
  • This solution can preferably be used for spring wires for automobiles that have one, e.g. have a conical length of no more than 2 m and their coils are less than 3 meters in diameter.
  • the time of switching for the preferably provided single switching point is selected according to claims 2 and 3.
  • the selection of the point in time within the specified ranges depends on whether the wire is conical in the longitudinal section which changes in diameter, or whether the contour of this longitudinal section lies outside or inside the conical contour. If the contour lies essentially outside the conical contour, the switchover time is placed in the vicinity of the cylindrical section with the smaller diameter; if the transition region is concave, the larger value is selected from the specified ranges.
  • the 30% to 40% range is the preferred range.
  • the limit diameters are the diameters which have the ends of an area with a variable diameter. Only those areas are considered in which the change in diameter does not undergo a change of sign.
  • the device for carrying out the method is characterized by at least 2 stops, between which the carriage is moved back and forth with the bending roller.
  • the carriage is only switched back and forth between the two stops.
  • a Switching device ensures the timely switching between the two positions of the slide, characterized by the position of the stops, with the bending roller.
  • the end position of the bending roller with the greater deflection of the wire stands for the smaller wire diameter and the end position of the slide with the bending roller for the smaller deflection for the larger wire diameter.
  • a control that continuously determines the respectively required deflection / bending roller position is not required.
  • the entire travel range of the carriage is regularly larger than the travel range, which is determined by the stops and which is matched to a single wire contour with cylindrical longitudinal sections with different diameters.
  • the adjustment drive for the slide with the bending roller is preferably designed according to claim 6.
  • the feature is gem.
  • Claim 7 provided.
  • the measuring device is connected in terms of control to the switching device and ensures the correct time to be selected for each wire profile for switching from the deflection for the smaller wire cross section to the larger one and vice versa. It preferably detects the diameter of the wire arranged between its sensors.
  • the wire On the underside of a machine frame 1, a group of 3 rollers 3, 4, 5 is provided, through which a wire is guided in the direction of arrow 7.
  • the wire consists of three different longitudinal sections.
  • the longitudinal sections 6 and 9 are cylindrical, the section 8 is conical, it is enclosed by the limit diameters 25, 26. Only a section of the endless wire is shown. Cylindrical and conical sections are repeatedly arranged on the wire in an alternating sequence.
  • the wire is bent round into a bundle in the round bending device and placed on a turntable 24 arranged below the round bending device.
  • rollers 3, 4 are mounted in a stationary manner in the machine frame 1, the bending roller 5 is rotatably mounted on a carriage 2 which can be moved in the machine frame 1 transversely to the direction of travel (arrow 7) of the wire.
  • the movement of the carriage 2 is carried out by means of a hydraulic cylinder 10.
  • the rollers are driven in rotation, not shown.
  • the direction of movement of the carriage 2 is determined with a switching device 15 designed as a 2/2 way valve, which is switched over by a control unit 17.
  • Two stops 11, 12 determine the end positions 22, 23 of the carriage.
  • a pump 16 sets the carriage 2 in motion and drives it against one of the two stops 11, 12.
  • the cylindrical longitudinal section 9 of the wire is given the correct curvature so that it relaxes from its radius of curvature fits on the turntable 24.
  • the wire is given the correct curvature for the cylindrical longitudinal section 6 of the wire which is thicker in diameter.
  • the circular bending device initially has the measuring device 21, which detects changes in the diameter of the wire with the aid of two sensing rollers 19, 20 and gives a pulse to the control unit 17 via a toggle switch 18.
  • the diameter of the wire is detected by the measuring device and the switching device 15 is set according to the specified diameter. If necessary, so if the wire is inserted with a thick cylindrical longitudinal section, the carriage is moved against the stop 12. As soon as the measuring device determines the diameter value provided for the switchover, because at this moment a conical longitudinal section passes the measuring device, the slide 2 with the bending roller 5 is moved against the other stop with a delay, which is caused by a module in the control unit 17 . This is done by means of a switching process effected on the switching device, which redirects the inflow of the hydraulic fluid from line 13 to line 14 or vice versa. Apart from the empirical or arithmetical determination of the switchover point, the switchover does not take into account the contour or length of the longitudinal section 8 connecting the two cylindrical sections 6, 9.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wire Processing (AREA)

Abstract

The bender is used for wires having a cross-section which varies according to their length, and comprising two cylindrical sections (6, 9) and an interleaved conical section (8). The wire is bent by means of three rollers. The bending roller (5) mounted on a carriage (2) determines the bending degree imparted to the fed wire. The wire is bent despite its variable diameter so that it is deposited with a regular curvature on the reception plate (24). To this effect, the curvature of the conical section (8) is changed between the correct curvature of the thinner cylindrical section (9) and that of the thicker cylindrical section (6). It only requires a simple switching at an appropriate time to obtain a wire bobbin which may be deposited on the reception plate (24). The appropriate switching time is situated between 20 and 60%, preferably between 30 and 40% from the beginning of the wire diameter increase.

Description

Die Erfindung bezieht sich auf ein Verfahren zum Rundbiegen von konischen Drähten gem. dem Oberbegriff von Anspruch 1 und auf eine Vorrichtung zur Durchführung des Verfahrens gem. dem Oberbegriff von Anspruch 4.The invention relates to a method for bending conical wires according to. the preamble of claim 1 and a device for performing the method according to the preamble of claim 4.

Es ist bekannt, Drähte zum Transport oder zur Lagerung zu Bunden aufzuwickeln. Bekannt sind Biegevorrichtungen der gattungsbildenden Art, die auch für Drähte eingesetzt werden können. Ein gerader Draht wird in die Vorrichtung eingeführt, kreisrund gebogen und auf einen Drehteller, Haspel oder dergleichen gelegt und bildet dort ein Drahtbund.It is known to wind up wires for bundles for transport or storage. Bending devices of the generic type are known which can also be used for wires. A straight wire is inserted into the device, bent into a circle and placed on a turntable, reel or the like, where it forms a coil of wire.

Derartige Vorrichtungen versagen, wenn der Draht keinen konstanten Querschnitt hat, wie dies z.B. bei Drähten für Schraubenfedern mit progressiver oder degressiver Federkennlinie der Fall ist. Gedacht ist an Draht für z.B. Schraubenfedern mit progressiver Federkennlinie, der erst später in Längsabschnitte zerteilt wird, die zum Wickeln der einzelnen Federn benötigt werden. Bei unveränderter Einstellung der Rundbiegemaschine führt ein zwischen 2 oder mehr Längsabschnitten mit unterschiedlichem Querschnitt variierender Draht zu blütenförmigen Drahtgebilden, die sich zum Transport und zur weiteren Bearbeitung nur noch schlecht eignen. Die Herstellung dieses Drahtes mit abwechselnd kleinerem und größerem Durchmesser erfolgt vorzugsweise durch Schälen.Such devices fail if the wire does not have a constant cross-section, e.g. is the case for wires for coil springs with progressive or degressive spring characteristic. We are thinking of wire for e.g. Coil springs with a progressive spring characteristic that is only later divided into longitudinal sections that are required to wind the individual springs. With the setting of the round bending machine unchanged, a wire varying between 2 or more longitudinal sections with different cross sections leads to flower-shaped wire structures which are only poorly suited for transport and further processing. This wire with alternately smaller and larger diameters is preferably produced by peeling.

Ene Anpassung der Einstellung der Rundbiegemaschine an den jeweiligen Querschnitt und dessen Trägheitsmoment, sowie an die Streckgrenze des jeweils zu biegenden Drahtmaterials ist rechnerisch sehr schwierig und verlangt einen hohen elektronischen Aufwand.Adapting the setting of the round bending machine to the respective cross-section and its moment of inertia, as well as to the yield point of the wire material to be bent is very difficult in terms of calculation and requires a high level of electronic expenditure.

Aus der JP-A-54 148 162 ist ein Verfahren zum Biegewickeln von Blechband, das zum Coil aufgewikkelt wird, bekannt. Zuvor wird das Blechband in einem Biegerollentrio auf die Wickelkrümmung gebogen. Die Biegerollen sind rechnergesteuert. Die Blechdicke wird vor dem Biegen erfaßt. Die dem Blechband zu vermittelnde Krümmung ändert sich mit dem Außendurchmesser des aufzuwickelnden Coils, der aus der Vorschubgeschwindigkeit und der Dicke des Blechs errechnet wird. Daraus wird die erforderliche Krümmung des Blechbandes bestimmt und an der auslaufseitigen Biegerolle eingestellt. Die Krümmung des Blechbandes wird kontinuierlich errechnet und verändert.From JP-A-54 148 162 a method for the bending winding of sheet metal strip which is wound up into the coil is known. Before that, the sheet metal strip is bent onto the winding curvature in a trio of bending rolls. The bending rolls are computer controlled. The sheet thickness is recorded before bending. The curvature to be imparted to the sheet metal strip changes with the outside diameter of the coil to be wound up, which is calculated from the feed speed and the thickness of the sheet metal. From this, the required curvature of the sheet metal strip is determined and set on the bending roller on the outlet side. The curvature of the sheet metal strip is continuously calculated and changed.

Nachteilig dabei ist der hohe Steuerungsaufwand zur Einstellung der erforderlichen Krümmung des Blechbandes. Die bekannte Lösung ist ungeeignet für doppelt konische Federdrähte.The disadvantage here is the high control effort for setting the required curvature of the sheet metal strip. The known solution is unsuitable for double conical spring wires.

Aus der US-PS 44 12 438 ist eine Biege-Wickelvorrichtung bekannt, die gerades in ein Rollentrio einlaufendes Rohr zu einem ordentlich geschichteten Coil aufwickelt. Die mittlere der 3 Rollen, die Biegerolle, wird motorisch verstellt. Die Verstellung erfolgt über eine auslaufseitig die resultierende Krümmung abtastende Rolle, die über einen elektrischen Kontakt bei Bedarf die Justierung der Biegerolle bewirkt. Das Rohr verändert seinen Querschnitt im Rahmen der Fertigungstoleranzen und die Justierung der Biegerolle dient dem Ausgleich der Krümmungsschwankungen die durch die Querschnittstoleranzen in einem Biegerollen-Trio entstehen. Nachteilig dabei ist wiederum der hohe Einstellungsaufwand für den Regelkreis und der Hardware-Aufwand für den Regelkreis.From US-PS 44 12 438 a bending winding device is known, which winds straight into a roll trio tube into a neatly layered coil. The middle of the 3 rollers, the bending roller, is adjusted by a motor. The adjustment is made via a roller that scans the resulting curvature on the outlet side and, if necessary, uses an electrical contact to adjust the bending roller. The tube changes its cross-section within the scope of the manufacturing tolerances and the adjustment of the bending roller serves to compensate for the fluctuations in curvature caused by the cross-sectional tolerances in a trio of bending rollers. Disadvantages here are again the high adjustment effort for the control loop and the hardware effort for the control loop.

Der Erfindung liegt die Aufgabe zugrunde, eine einfache Lösung zu finden, mit der Drähte mit auf ihrer Länge zwischen einem großen und einem kleinen Durchmesser variierendem Querschnitt zu ringförmigen Bunden aufgewickelt werden können.The invention has for its object to find a simple solution with which wires with a cross-section varying in length between a large and a small diameter can be wound into annular coils.

Die Lösung dieser Aufgabe ist in den kennzeichnenden Merkmalen der Ansprüche 1 und 4 wiedergegeben. Die Lösung beruht auf der Erkenntnis, daß ein Umschaltvorgang, theoretisch eine Sprungfunktion, also ein schlagartiger Wechsel zwischen der für den größeren und den kleineren Querschnitt zutreffenden Durchbiegung ausreicht, ein transportfähiges Drahtbund zu biegen. Bei sehr weit auseinanderliegenden Durchmessern aufeinanderfolgender zylindrischer Drahtabschnitte kann vorgesehen sein, die Durchbiegung in zwei Stufen von dem kleineren auf den größeren Durchmesser zu schalten.The solution to this problem is given in the characterizing features of claims 1 and 4. The solution is based on the knowledge that a switching process, theoretically a step function, i.e. a sudden change between the deflection applicable to the larger and the smaller cross section, is sufficient to bend a transportable wire bundle. If the diameters of successive cylindrical wire sections are very far apart, provision can be made to switch the deflection in two stages from the smaller to the larger diameter.

Es kann ein Verzögerungsbaustein, z.B. eine Drossel in der Hydraulik vorgesehen sein, der den Umschaltvorgang zeitlich erstreckt. Damit wird vermieden, daß ein Knick im Draht entsteht.A delay module, e.g. a throttle can be provided in the hydraulic system, which extends the switching process over time. This prevents a kink in the wire.

Diese Lösung kann vorzugsweise bei Federdrähten für Automobile eingesetzt werden, die eine, z.B. konische Länge von nicht mehr als 2 m haben und deren Coils im Durchmesser unter 3 Meter liegen.This solution can preferably be used for spring wires for automobiles that have one, e.g. have a conical length of no more than 2 m and their coils are less than 3 meters in diameter.

Der Zeitpunkt des Umschaltens für den bevorzugt vorgesehenen einzigen Umschaltpunkt wird gemäß den Ansprüchen 2 und 3 ausgewählt. Dabei hängt die Auswahl des Zeitpunktes innerhalb der angegebenen Bereiche davon ab, ob der Draht in dem sich im Durchmesser verändernden Längsabschnitt konisch ausgebildet ist, oder ob die Kontur dieses Längsabschnittes außerhalb oder innerhalb der konischen Kontur liegt. Bei im wesentlichen außerhalb der konischen Kontur liegender Kontur wird der Umschaltzeitpunkt in die Nähe des zylindrischen Abschnittes mit dem kleineren Durchmesser gelegt, bei konkaver Ausbildung des Übergangsbereichs wählt man den größeren Wert aus den angegebenen Bereichen.The time of switching for the preferably provided single switching point is selected according to claims 2 and 3. The selection of the point in time within the specified ranges depends on whether the wire is conical in the longitudinal section which changes in diameter, or whether the contour of this longitudinal section lies outside or inside the conical contour. If the contour lies essentially outside the conical contour, the switchover time is placed in the vicinity of the cylindrical section with the smaller diameter; if the transition region is concave, the larger value is selected from the specified ranges.

Der Bereich von 30% bis 40% ist der bevorzugte Bereich.The 30% to 40% range is the preferred range.

Als Grenzdurchmesser werden die Durchmesseer bezeichnet, die die Enden eines betrachteten Bereichs mit veränderlichem Durchmesser aufweisen. Es werden stets nur solche Bereiche Betrachtet, in denen die Veränderung des Durchmessers keinen Vorzeichenwechsel durchmacht.The limit diameters are the diameters which have the ends of an area with a variable diameter. Only those areas are considered in which the change in diameter does not undergo a change of sign.

Erfindungsgemäß ist die Vorrichtung zur Durchführung des Verfahrens durch mindestens 2 Anschläge gekennzeichnet, zwischen denen der Schlitten mit der Biegerolle hin- und hergefahren wird. Der Schlitten wird nur zwischen den beiden Anschlägen hin und her geschaltet. Eine Umschaltvorrichtung besorgt das rechtzeitige Umschalten zwischen den beiden durch die Lage der Anschläge gekennzeichneten Stellungen des Schlittens mit der Biegerolle. Die Endstellung der Biegerolle mit der stärkeren Durchbiegung des Drahtes steht dabei für den kleineren Drahtdurchmesser und die Endstellung des Schlittens mit der Biegerolle für die kleiner Durchbiegung für den größeren Drahtdurchmesser. Eine die jeweilig erforderliche Durchbiegung/Biegerollenstellung laufend ermittelnde Steuerung entfällt.According to the invention, the device for carrying out the method is characterized by at least 2 stops, between which the carriage is moved back and forth with the bending roller. The carriage is only switched back and forth between the two stops. A Switching device ensures the timely switching between the two positions of the slide, characterized by the position of the stops, with the bending roller. The end position of the bending roller with the greater deflection of the wire stands for the smaller wire diameter and the end position of the slide with the bending roller for the smaller deflection for the larger wire diameter. A control that continuously determines the respectively required deflection / bending roller position is not required.

Entsprechend der bevorzugt vorgesehenen Ausgestaltung der Erfindung nach Anspruch 5 ist der gesamte Verfahrbereich des Schlittens regelmäßig größer als der Verfahrbereich, der durch die Anschläge bestimmt ist und der auf eine einzige Drahtkontur mit zylindrischen Längsabschnitten mit unterschiedlichen Durchmessern abgestimmt ist.According to the preferred embodiment of the invention according to claim 5, the entire travel range of the carriage is regularly larger than the travel range, which is determined by the stops and which is matched to a single wire contour with cylindrical longitudinal sections with different diameters.

Der Verstellantrieb für den Schlitten mit der Biegerolle ist vorzugsweise entsprechend Anspruch 6 ausgebildet.The adjustment drive for the slide with the bending roller is preferably designed according to claim 6.

In Weiterbildung der Erfindung ist das Merkmal gem. Anspruch 7 vorgesehen. Die Meßeinrichtung ist steuerungsmäßig mit der Umschaltvorrichtung verbunden und stellt den richtigen für jedes Drahtprofil auszuwählenden Zeitpunkt für das Umschalten von der Durchbiegung für den kleineren Drahtquerschnitt auf den größeren und umgekehrt sicher. Sie erfaßt vorzugsweise den Durchmesser des zwischen ihren Maßfühlern angeordneten Drahtes.In a development of the invention, the feature is gem. Claim 7 provided. The measuring device is connected in terms of control to the switching device and ensures the correct time to be selected for each wire profile for switching from the deflection for the smaller wire cross section to the larger one and vice versa. It preferably detects the diameter of the wire arranged between its sensors.

Die Erfindung wird im einzelnen anhand der Zeichnung näher erläutert, dabei zeigen:

  • Fig. 1: Eine Seitenansicht der Rundbiegevorrichtung
  • Fig. 2: eine Unteransicht der Rundbiegevorrichtung gem. Linie 11-11.
The invention is explained in more detail with reference to the drawing, which show:
  • Fig. 1: A side view of the round bending device
  • 2: a bottom view of the round bending device acc. Line 11-11.

An der Unterseite eines Maschinengestells 1 ist eine Gruppe von 3 Rollen 3, 4, 5 vorgesehen, durch die ein Draht in Richtung des Pfeiles 7 geführt wird. Der Draht besteht aus drei unterschiedlichen Längsabschnitten. Die Längsabschnitte 6 und 9 sind zylindrisch, der Abschnitt 8 ist konisch, er wird von den Grenzdurchmessern 25, 26 eingeschlossen. Es ist nur ein Teilstück von dem an sich endlosen Draht gezeigt. Auf dem Draht sind in wechselnder Folge immer wieder zylindrische und konische Abschnitte angeordnet. Der Draht wird in der Rundbiegevorrichtung zu einem Bund rundgebogen und auf einen unterhalb der Rundbiegevorrichtung angeordneten Drehtisch 24 abgelegt.On the underside of a machine frame 1, a group of 3 rollers 3, 4, 5 is provided, through which a wire is guided in the direction of arrow 7. The wire consists of three different longitudinal sections. The longitudinal sections 6 and 9 are cylindrical, the section 8 is conical, it is enclosed by the limit diameters 25, 26. Only a section of the endless wire is shown. Cylindrical and conical sections are repeatedly arranged on the wire in an alternating sequence. The wire is bent round into a bundle in the round bending device and placed on a turntable 24 arranged below the round bending device.

Die Rollen 3, 4 sind ortsfest im Maschinengestell 1 gelagert, die Biegerolle 5 ist auf einem im Maschinengestell 1 quer zur Durchlaufrichtung (Pfeil 7) des Drahtes verfahrbaren Schlitten 2 drehbar gelagert. Die Bewegung des Schlittens 2 wird mittels eines Hydraulikzylinders 10 durchgeführt. Die Rollen sind in nicht gezeigter Art drehangetrieben.The rollers 3, 4 are mounted in a stationary manner in the machine frame 1, the bending roller 5 is rotatably mounted on a carriage 2 which can be moved in the machine frame 1 transversely to the direction of travel (arrow 7) of the wire. The movement of the carriage 2 is carried out by means of a hydraulic cylinder 10. The rollers are driven in rotation, not shown.

Mit einer als 2/2 Wegeventil ausgebildeten Umschaltvorrichtung 15, die von einer Steuereinheit 17 umgeschaltet wird, wird die Bewegungsrichtung des Schlittens 2 bestimmt. Zwei Anschläge 11, 12 bestimmen die Endlagen 22, 23 des Schlittens. Eine Pumpe 16 setzt den Schlitten 2 in Bewegung und fährt ihn gegen einen der beiden Anschläge 11, 12. Wenn der Schlitten 2 am Anschlag 11 anliegt, erhält der zylindrische Längsabschnitt 9 des Drahtes die richtige Krümmung, so daß er im entspannten Zustand von seinem Krümmungsradius her auf den Drehtisch 24 paßt. Wenn der Schlitten 2 am Anschlag 12 anliegt, stellt sich am Draht die richtige Krümmung für den im Durchmesser dickeren zylindrischen Längsabschnitt 6 des Drahtes ein. Mit dem Schlitten 2, der Umschaltvorrichtung 15 und der Meßvorrichtung 21 und der Steuereinrichtung 17, die die Umschaltung einleiten, wird der Schlitten von einer Endstellung 23 in die andere Endstellung 22 geschoben.The direction of movement of the carriage 2 is determined with a switching device 15 designed as a 2/2 way valve, which is switched over by a control unit 17. Two stops 11, 12 determine the end positions 22, 23 of the carriage. A pump 16 sets the carriage 2 in motion and drives it against one of the two stops 11, 12. When the carriage 2 is in contact with the stop 11, the cylindrical longitudinal section 9 of the wire is given the correct curvature so that it relaxes from its radius of curvature fits on the turntable 24. When the slide 2 rests against the stop 12, the wire is given the correct curvature for the cylindrical longitudinal section 6 of the wire which is thicker in diameter. With the carriage 2, the switching device 15 and the measuring device 21 and the control device 17 which initiate the switching, the carriage is pushed from one end position 23 to the other end position 22.

Die Rundbiegevorrichtung weist eingangs die Meßeinrichtung 21 auf, die Änderungen im Durchmesser des Drahtes mit Hilfe zweier Tastrollen 19, 20 feststellt und einen Impuls über einen Kippschalter 18 an die Steuereinheit 17 gibt.The circular bending device initially has the measuring device 21, which detects changes in the diameter of the wire with the aid of two sensing rollers 19, 20 and gives a pulse to the control unit 17 via a toggle switch 18.

Die Rundbiegevorrichtung funktioniert wie folgt:

  • Zur Einstellung der Rundbiegevorrichtung werden für den zu biegenden Draht und dessen Kontur die beiden Endstellungen des Schlittens 2 durch die Anschläge 11 und 12 fixiert und in der Steuereinheit der Umschaltzeitpunkt bzw. der Umschaltdurchmesser des Drahtes in Abhängigkeit von der Kontur des Abschnittes 8 festgelegt. Die Umschaltung erfolgt in einem Durchmesserbereich, der, ausgehend von dem kleineren Durchmesser bei 20% bis 60%, vorzugsweise 30% bis 40% des Durchmesserzuwachses bis zum größeren Durchmesser liegt. Bei diesem rechnerisch festzulegenden Durchmesser wird die eventuell von der Konusform abweichende Kontur des Abschnittes 8 berücksichtigt. Bei einer im wesentlichen schlankeren Kontur als dem gezeigten konischen Längsabschnitt 8 wird der Umschaltpunkt am oberen Ende der angegebenen Bereiche liegen, während bei einer weitgehend konvexen Kontur dieses Längsabschnittes der Umschaltpunkt in der Nähe der unteren Werte der angegebenen Bereiche liegt.
The round bending device works as follows:
  • To set the round bending device, the two end positions of the slide 2 are fixed by the stops 11 and 12 for the wire to be bent and its contour, and the changeover time or the changeover diameter of the wire is determined in the control unit as a function of the contour of section 8. The changeover takes place in a diameter range which, starting from the smaller diameter, is 20% to 60%, preferably 30% to 40% of the diameter increase up to the larger diameter. With this diameter to be determined by calculation, the contour of section 8 which possibly deviates from the cone shape is taken into account. With a substantially slimmer contour than the conical longitudinal section 8 shown, the switchover point will be at the upper end of the specified ranges, while with a largely convex contour of this longitudinal section the switchover point will be close to the lower values of the specified ranges.

Beim Einführen des Drahtes gem. Pfeil 7 wird der Durchmesser des Drahtes von der Meßeinrichtung erfaßt und die Umschaltvorrichtung 15 entsprechend dem angegebenen Durchmesser gestellt. Sofern erforderlich, wenn also der Draht mit einem dicken zylindrischen Längsabschnitt eingeführt wird, wird der Schlitten gegen den Anschlag 12 gefahren. Sobald die Meßeinrichtung den für die Umschaltung vorgesehenen Durchmesserwert feststellt, weil in diesem Augenblick ein konischer Längsabschnitt die Meßeinrichtung passiert, wird mit einer Verzögerung, die durch einen Baustein in der Steuereinheit 17 bewirkt wird, der Schlitten 2 mit der Biegerolle 5 gegen den anderen Anschlag gefahren. Dies geschieht durch einen an der Umschaltvorrichtung bewirkten Schaltvorgang, der den Zulauf der Hydraulikflüssigkeit von der Leitung 13 auf die Leitung 14 oder umgekehrt umleitet. Abgesehen von der empirischen oder rechnerischen Bestimmung des Umschaltpunktes, erfolgt beim Umschalten keine Berücksichtigung der Kontur oder Länge des die beiden zylindrischen Abschnitte 6, 9 verbindenden Längsabschnittes 8.When inserting the wire acc. Arrow 7, the diameter of the wire is detected by the measuring device and the switching device 15 is set according to the specified diameter. If necessary, so if the wire is inserted with a thick cylindrical longitudinal section, the carriage is moved against the stop 12. As soon as the measuring device determines the diameter value provided for the switchover, because at this moment a conical longitudinal section passes the measuring device, the slide 2 with the bending roller 5 is moved against the other stop with a delay, which is caused by a module in the control unit 17 . This is done by means of a switching process effected on the switching device, which redirects the inflow of the hydraulic fluid from line 13 to line 14 or vice versa. Apart from the empirical or arithmetical determination of the switchover point, the switchover does not take into account the contour or length of the longitudinal section 8 connecting the two cylindrical sections 6, 9.

Claims (10)

1. A process for coiling and bending wires having at least one large cylindrical section and one small cylindrical section and at least one intermediate longitudinal section with a transitional cross section comprising the following features:
a) the wire is bent by at least three rollers in a known manner,
b) in the area of the cylindrical sections the wire is bent with a constant curvature,
q1) measuring of the section with the transitional cross section takes place upstream of the rollers,
characterized by the following features:
c1) the amount of bending of the wire is varied in the area of the increasing or decreasing cross section,
d) the change-over takes place on the longitudinal section of the wire along which the diameter is changing by switching from a curvature suitable for the small diameter to a curvature suitable for the larger diameter and vice versa.
2. A process for coiling and bending wires according to claim 1 characterized by the following feature:
e) the switch-over is effected at a point where the diameter is equivalent to an amount between 20% and 60% of the difference between the adjacent end diameters above the smaller end diameter.
3. A process for coiling and bending wires according to claims 1 and 2, characterized by the following feature:
f) the switch-over is effected at a point where the diameter is equivalent to an amount between 30% and 40% of the difference between the adjacent end diameters above the smaller end diameter.
4. A device for performing the process according to claims 1 to 3 comprising the following features:
g) a machine housing (1),
h) at least three rollers (3, 4, 5) are journaled on the housing (1),
i) one roller, the bending roller (5), is mounted on a slide (2) which, in turn, is mounted on guides on the housing,
k) an automatically controlled drive (16) for the slide (2),
q) a measuring device (21) is provided upstream of the bending roller (5),
characterized by the following features:
I) a switching device (15) for the slide drive, m) limitations for the slide (2) consisting of two stops (11, 12), defining the end positions (22, 23) of the slide,
s) no computer is required for computing the necessary curvature based on the data furnished by the measuring device.
5. A device for coiling conical wires according to claim 4 characterized by the following features:
n) both stops (11, 12) are adjustable,
o) both end positions of the slide as determined by the stops result in curvatures within the working range of the device.
6. A device for coiling conical wires according to claim 4 characterized by the following feature:
p) a hydraulic drive (10, 16).
7. A device for coiling conical wires according to claim 4 characterized by the following feature:
q) a measuring device (21) is provided upstream of the bending roller (5).
EP85905317A 1985-02-20 1985-10-18 Device for bending conical wires Expired - Lifetime EP0215006B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85905317T ATE56377T1 (en) 1985-02-20 1985-10-18 DEVICE FOR ROUND BENDING OF CONICAL WIRE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3505739 1985-02-20
DE19853505739 DE3505739A1 (en) 1985-02-20 1985-02-20 DEVICE FOR BENDING CONICAL WIRE

Publications (2)

Publication Number Publication Date
EP0215006A1 EP0215006A1 (en) 1987-03-25
EP0215006B1 true EP0215006B1 (en) 1990-09-12

Family

ID=6262954

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85905317A Expired - Lifetime EP0215006B1 (en) 1985-02-20 1985-10-18 Device for bending conical wires

Country Status (5)

Country Link
US (1) US4918958A (en)
EP (1) EP0215006B1 (en)
JP (1) JPS62501894A (en)
DE (2) DE3505739A1 (en)
WO (1) WO1986004837A1 (en)

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Also Published As

Publication number Publication date
WO1986004837A1 (en) 1986-08-28
JPS62501894A (en) 1987-07-30
EP0215006A1 (en) 1987-03-25
US4918958A (en) 1990-04-24
DE3505739A1 (en) 1986-08-21
DE3579695D1 (en) 1990-10-18

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