EP0671227B1 - Tool clamping device for a bending press - Google Patents

Tool clamping device for a bending press Download PDF

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Publication number
EP0671227B1
EP0671227B1 EP95103500A EP95103500A EP0671227B1 EP 0671227 B1 EP0671227 B1 EP 0671227B1 EP 95103500 A EP95103500 A EP 95103500A EP 95103500 A EP95103500 A EP 95103500A EP 0671227 B1 EP0671227 B1 EP 0671227B1
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EP
European Patent Office
Prior art keywords
clamping
bracket
bar
tool
clamping bracket
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
Application number
EP95103500A
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German (de)
French (fr)
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EP0671227A1 (en
Inventor
Hermann Lindner
Hermann Lautenbacher
Franz Schröder
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Hans Schroeder Maschinenbau GmbH
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Hans Schroeder Maschinenbau GmbH
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Publication of EP0671227A1 publication Critical patent/EP0671227A1/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
    • B21D5/04—Bending sheet metal along straight lines, e.g. to form simple curves on brakes making use of clamping means on one side of the work
    • 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
    • B21D5/02—Bending sheet metal along straight lines, e.g. to form simple curves on press brakes without making use of clamping means
    • B21D5/0209—Tools therefor
    • B21D5/0236—Tool clamping

Definitions

  • the invention relates to a tool clamping device for a folding machine, more precisely a tool clamping device for the upper cheek, lower cheek or Bending beam tool of a folding machine, in which the Tool by means of a clamping rail between a clamping surface one arranged on the upper, lower or bending beam Clamping bracket and a clamping surface on the clamping bracket arranged clamping rail worn clamped is.
  • the tensioning rail is by a number of in the tensioning bracket in the direction perpendicular to the clamping surfaces of the clamping bracket and tensioning rail functionally arranged actuators optionally for clamping the tool in the sense a mutual approach of the clamping surfaces of the clamping bracket and tensioning rail towards the tensioning bracket and for releasing the Tool in the sense of a mutual removal of the clamping surfaces of clamping bracket and clamping rail from the clamping bracket is movable away.
  • the upper cheek, lower cheek or Bending beam tool usually by means of a Bolt against one arranged on the respective cheek Clamping bracket screwed clamping rail clamped.
  • a number of manufacturing steps can be processed with different tools must result in significant productivity losses.
  • EP-A-0 446 810 discloses such a clamping device for a die press known. With this clamping device the tool is aligned in the usual way Pressurization.
  • the object of the present invention is therefore a To create tool clamping device of the type mentioned, where the tool is quick and easy can be replaced.
  • a tool clamping device for the upper cheek, lower cheek or Bending beam tool of a folding machine where the tool by means of a Tensioning rail between a clamping surface on the top, Clamping bracket and one arranged under the lower or bending beam Clamping surface of the clamping rail arranged on the clamping bracket is worn clamped.
  • the tensioning rail is by a number from in the clamping bracket in the direction perpendicular to the clamping surfaces function of the clamping bracket and clamping rail arranged actuators optionally for clamping the Tool in the sense of a mutual approach of the clamping surfaces from the clamping bracket and the clamping rail to the clamping bracket to and for loosening the tool in the sense of a mutual Removing the clamping surfaces of the clamping bracket and clamping rail movable away from the clamping bracket.
  • At the clamping surface of the Clamping bracket is parallel to the longitudinal direction of the clamping bracket extending prism rail arranged, and the tool contains a parallel to its longitudinal direction prismatic groove into which the prism rail at Clamps engages and the tool is centered.
  • the main advantage of the tool clamping device according to the invention is therefore that the tool exchanged in a few simple steps and in a short amount of time or be moved in the cheek in question can.
  • the tool clamping device according to the invention is particularly advantageous when used for the upper beam tool, the most common in common manufacturing processes must be replaced or postponed.
  • the actuators a number of spring assemblies included through which the tensioning rail with a permanent to cold the tool during the Sufficient spring force in the sense of a mutual Clamping surfaces of clamping bracket and Tensioning rail is applied.
  • the main advantage here is that the tool by the spring force of the spring assemblies regardless of a hydraulic pressure source is kept permanently and reliably.
  • the actuators contain a number of hydraulic cylinders, through which the tensioning rail with the force of the spring elements exceeding force in the sense of mutual Removing the clamping surfaces of the clamping bracket and clamping rail can be applied away from each other.
  • the hydraulic cylinder quickly and easily by loosening release the tensioning rail from the tensioning bracket and then again to be able to clamp, which in the clamped state Then again permanently and reliably through the tool Spring force of the spring assemblies is held.
  • the actuators have a number of hydraulic cylinders included, through which the clamping rail in the sense of a mutual approach and removal of the clamping surfaces from tensioning bracket and tensioning rail to the tensioning bracket to and from this can be moved away.
  • this is a concern to bear that causing the clamping of the tool Hydraulic cylinders constantly monitored by a hydraulic pressure be applied, otherwise a loosening of the Tool can be the result.
  • each spring arrangement in a perpendicular to the clamping surface Hole in the clamping bracket is sunk and a spring element and one facing away from the tensioning rail Side of the clamping bracket through a hole smaller diameter than that accommodating the spring arrangement Drilling through the clamping bracket into one Threaded screw bolts screwed into the clamping rail contains, the spring element with one end against the head of the bolt and with his other Support the end against a contact surface on the clamping bracket.
  • each spring element in a package of stacked disc springs consists. With such an arrangement of disc springs it is possible with a very compact spring arrangement to generate a high spring force.
  • Fig. 1 shows in cross section the upper cheek 14 Folding machine with a bolt 15 attached to it and dowel pins 16 attached tensioning bracket 1.
  • the tensioning bracket 1 is used together with a tensioning rail 6 for fastening an upper beam tool 11, which here in the form of a Gooseneck splint is shown.
  • the tool 11 is between a clamping surface 1a on the underside of the clamping bracket 1 and a clamping surface 6a on the top of the tensioning rail 6 pinched.
  • a prism rail 2 arranged in the clamped state of the tool 11 in one on its top, likewise extending in the longitudinal direction arranged prismatic Groove 2a engages. This way, I'm excited State the tool 11 with respect to the transverse direction fixed.
  • the bolt 9 runs from that of the tensioning rail 6 opposite side of the clamping bracket 1 ago a bore 9a at the bottom of the spring assembly 8, 9 accommodating Hole 9d with a smaller diameter than the latter through the clamping console 1 into a thread in the Tensioning rail 6.
  • the spring element formed by the disc springs 8 rests with one end against the head 9b of the bolt 9 and with its other end against a contact surface 9c at the bottom of the bore 9d. So is the spring arrangement 8, 9 completely in the clamping bracket 1 arranged sunk.
  • the spring assemblies 8, 9 cause the tensioning rail 6 with a permanent force to hold the tool 11 in the sense of mutual approximation of the clamping surfaces 1a, 6a acted upon by tensioning bracket 1 and tensioning rail 6 becomes.
  • the spring force of the spring elements 8 chosen so that the force to hold the tool during the work process is guaranteed. In the embodiment is the clamping force of the spring elements 8 7,500 N or more per 100 mm length of the clamping bracket 1.
  • Sectional representations can be seen in the clamping console 1 continues in a row at regular intervals a number of hydraulic cylinders 3 arranged, the Loosen the through the tensioning bracket 1 and the tensioning rail 6 serve clamping device.
  • each hydraulic cylinder contains 3 a cylinder bore 3a and one displaceable therein arranged piston 3b.
  • the piston 3b has via a guide ring 5, through which a tilting in the Cylinder bore 3a is prevented, as well as via a grooved ring 4, the sealing of the piston 3b against the cylinder bore 3a ensures.
  • From the inside of the hydraulic cylinder 3 runs in the upper area of an inlet hole 3c to the outside of the tensioning bracket 1.
  • the supply line 3c runs perpendicular to the axis of the cylinder bore 3a and perpendicular to the longitudinal axis of the clamping bracket 1.
  • the hydraulic line 12 is not one shown drive device supplied with pressure, wherein this drive device preferably a hydraulic pump and has an accumulator for maintaining the hydraulic pressure.
  • Stroke can be between one and four millimeters, in the illustrated embodiment, it is 2 mm.
  • the height of the prism rail 2 is above the clamping surface 1a in this case 1.5 mm smaller than the stroke of 2 mm, so that the tool 11 with a remaining one Clearance of 0.5 mm between the clamping console 1 and the tensioning rail 6 can be inserted. If so Hydraulic cylinder 3 are relieved of the hydraulic pressure, is the tensioning rail 6 again by the force of the spring elements 8 via the bolts 9 to the clamping bracket 1 used, the tool 11 with simultaneous Centering through the prism rail 2 between the clamping bracket 1 and clamping rail 6 is clamped.
  • the lifting capacity of the Hydraulic cylinder 3 must overcome the action of the spring elements 8 be greater than their clamping force, and is in the embodiment, 12,000 N or more per 100 mm Length of the clamping bracket 1, whereby the spring elements 8 to be compressed to their final force at the end of the stroke can.
  • the hydraulic cylinder 3 in a row in the central Area related to the transverse direction of the tensioning bracket 1 arranged, whereas the by the spring elements 8 and Bolt 9 spring elements formed in rows on both sides the series of hydraulic cylinders 3 are arranged.
  • the spring assemblies 8, 9 and Hydraulic cylinder 3 each in groups of four spring arrangements 8, 9 and one in the center of said four spring arrangements located hydraulic cylinder 3 arranged.
  • the required pressure at lifting capacity of 12,000 N per 100 mm length of the clamping bracket 250 bar.
  • the hydraulic cylinders 3 are each at intervals of 100 mm arranged so that per 100 mm length of the clamping bracket 1 a hydraulic cylinder and four spring assemblies 8, 9 are provided are.
  • a hydraulic cylinder and four spring assemblies 8, 9 are provided are.
  • each with a hydraulic cylinder is provided to the clamping force of two spring assemblies overcome, or other suitable arrangements.

Abstract

The clamping mechanism for tools of a swivel bending machine incorporates a rail (6) for clamping a tool (11) between the clamping surfaces of this rail and a bracket (1) attached to the top, bottom or bending cheek of the machine. The mechanism is characterised by the presence of a number of actuator elements (3,8,9) functioning perpendicular to the clamping surfaces in such a way that these surfaces move towards (for clamping the tool) or away from (for releasing the tool) one another.

Description

Die Erfindung betrifft eine Werkzeugspannvorrichtung für eine Schwenkbiegemaschine, genauer gesagt eine Werkzeugspannvorrichtung für das Oberwangen-, Unterwangen- oder Biegewangenwerkzeug einer Schwenkbiegemaschine, bei der das Werkzeug mittels einer Spannschiene zwischen einer Klemmfläche einer an der Ober-, Unter- oder Biegewange angeordneten Spannkonsole und einer Klemmfläche der an der Spannkonsole angeordneten Spannschiene geklemmt getragen ist. Die Spannschiene ist durch eine Anzahl von in der Spannkonsole in Richtung senkrecht zu den Klemmflächen von Spannkonsole und Spannschiene funktionswirksam angeordneten Betätigungselementen wahlweise zum Klemmen des Werkzeugs im Sinne einer gegenseitigen Annäherung der Klemmflächen von Spannkonsole und Spannschiene auf die Spannkonsole zu und zum Lösen des Werkzeugs im Sinne eines gegenseitigen Entfernens der Klemmflächen von Spannkonsole und Spannschiene von der Spannkonsole weg bewegbar ist.The invention relates to a tool clamping device for a folding machine, more precisely a tool clamping device for the upper cheek, lower cheek or Bending beam tool of a folding machine, in which the Tool by means of a clamping rail between a clamping surface one arranged on the upper, lower or bending beam Clamping bracket and a clamping surface on the clamping bracket arranged clamping rail worn clamped is. The tensioning rail is by a number of in the tensioning bracket in the direction perpendicular to the clamping surfaces of the clamping bracket and tensioning rail functionally arranged actuators optionally for clamping the tool in the sense a mutual approach of the clamping surfaces of the clamping bracket and tensioning rail towards the tensioning bracket and for releasing the Tool in the sense of a mutual removal of the clamping surfaces of clamping bracket and clamping rail from the clamping bracket is movable away.

Bei Schwenkbiegemaschinen wird das Oberwangen-, Unterwangen- oder Biegewangenwerkzeug üblicherweise mittels einer durch Schraubbolzen gegen eine an der jeweiligen Wange angeordnete Spannkonsole verschraubte Spannschiene geklemmt. Dies bedeutet, daß für jeden Wechsel des Werkzeugs eine große Anzahl von Schraubbolzen gelöst, die Spannschiene abgenommen, das Werkzeug ausgetauscht, die Spannschiene wieder angebracht und die Schraubbolzen wieder befestigt werden müssen, was einen ganz erheblichen Zeit- und auch Kräfteaufwand bedeutet. Insbesondere bei Herstellungsvorgängen, bei denen eine Anzahl von Herstellungsschritten mit verschiedenen Werkzeugen abgearbeitet werden müssen, ergeben sich dadurch erhebliche Produktivitätseinbußen.In folding machines, the upper cheek, lower cheek or Bending beam tool usually by means of a Bolt against one arranged on the respective cheek Clamping bracket screwed clamping rail clamped. This means, that for each change of the tool a large number of Bolt loosened, the clamping rail removed, the tool replaced, the tensioning rail reattached and the Bolts need to be reattached, which is quite a considerable time and effort means. Especially in manufacturing operations where a number of manufacturing steps can be processed with different tools must result in significant productivity losses.

Aus der EP-A-0 446 810 ist eine derartige Klemmvorrichtung für eine Gesenkbiegepresse bekannt. Bei dieser Klemmvorrichtung erfolgt in üblicher Weise eine Ausrichtung des Werkzeuges mit Druckbeaufschlagung.EP-A-0 446 810 discloses such a clamping device for a die press known. With this clamping device the tool is aligned in the usual way Pressurization.

Bei Schwenkbiegemaschinen, bei denen in unterschiedlicher Richtung wirkende Kräfte im Verlauf des Schwenkbiegevorgangs angewendet werden, treten entsprechend hohe Belastungen auf. Diese können zu Verschiebungen oder sogar Aushebeln des Werkzeugs führen. Ein sicheres Halten des Werkzeugs ist daher für den Schwenkbiegevorgang sehr wichtig.For folding machines, in which in different directions acting forces applied in the course of the swivel bending process correspondingly high loads occur. This can cause displacements or even levering out the tool to lead. A safe holding of the tool is therefore essential for the Swivel bending process very important.

Außerdem ist herkömmlich die Montage des Werkzeugs zeitaufwendig und erfordert Übung und Geschick der Bedienungsperson. In addition, the assembly of the tool is conventionally time-consuming and requires operator skill and skill.

Nach dem Lösen der Schrauben und Werkzeugwechsel wird das neue Werkzeug eingesetzt und durch Stöße in der Sollage fixiert.After loosening the screws and changing tools, the new one Tool inserted and fixed in the target position by means of joints.

Die Aufgabe der vorliegenden Erfindung ist es daher, eine Werkzeugspannvorrichtung der eingangs genannten Art zu schaffen, bei der das Werkzeug schnell und auf einfache Weise ausgewechselt werden kann.The object of the present invention is therefore a To create tool clamping device of the type mentioned, where the tool is quick and easy can be replaced.

Diese Aufgabe wird gemäß der vorliegenden Erfindung gelöst durch eine Werkzeugspannvorrichtung für das Oberwangen-, Unterwangen- oder Biegewangenwerkzeug einer Schwenkbiegemaschine, bei der das Werkzeug mittels einer Spannschiene zwischen einer Klemmfläche einer an der Ober-, Unter- oder Biegewange angeordneten Spannkonsole und einer Klemmfläche der an der Spannkonsole angeordneten Spannschiene geklemmt getragen ist. Die Spannschiene ist durch eine Anzahl von in der Spannkonsole in Richtung senkrecht zu den Klemmflächen von Spannkonsole und Spannschiene funktionswirksam angeordneten Betätigungselementen wahlweise zum Klemmen des Werkzeugs im Sinne einer gegenseitigen Annäherung der Klemmflächen von Spannkonsole und Spannschiene auf die Spannkonsole zu und zum Lösen des Werkzeugs im Sinne eines gegenseitigen Entfernens der Klemmflächen von Spannkonsole und Spannschiene von der Spannkonsole weg bewegbar. An der Klemmfläche der Spannkonsole ist eine parallel zur Längsrichtung der Spannkonsole verlaufende Prismenschiene angeordnet, und das Werkzeug enthält eine parallel zu seiner Längsrichtung verlaufende prismatisch ausgebildete Nut, in die die Prismenschiene beim Klemmen eingreift und das Werkzeug zentriert.This object is achieved according to the present invention by a tool clamping device for the upper cheek, lower cheek or Bending beam tool of a folding machine, where the tool by means of a Tensioning rail between a clamping surface on the top, Clamping bracket and one arranged under the lower or bending beam Clamping surface of the clamping rail arranged on the clamping bracket is worn clamped. The tensioning rail is by a number from in the clamping bracket in the direction perpendicular to the clamping surfaces function of the clamping bracket and clamping rail arranged actuators optionally for clamping the Tool in the sense of a mutual approach of the clamping surfaces from the clamping bracket and the clamping rail to the clamping bracket to and for loosening the tool in the sense of a mutual Removing the clamping surfaces of the clamping bracket and clamping rail movable away from the clamping bracket. At the clamping surface of the Clamping bracket is parallel to the longitudinal direction of the clamping bracket extending prism rail arranged, and the tool contains a parallel to its longitudinal direction prismatic groove into which the prism rail at Clamps engages and the tool is centered.

Der wesentliche Vorteil der erfindungsgemäßen Werkzeugspannvorrichtung besteht somit darin, daß das Werkzeug mit wenigen Handgriffen und mit geringem Zeitaufwand ausgetauscht oder in der betreffenden Wange verschoben werden kann. Von besonderem Vorteil ist die erfindungsgemäße Werkzeugspannvorrichtung bei der Verwendung für das Oberwangenwerkzeug, das bei üblichen Herstellungsvorgängen am häufigsten ausgetauscht oder verschoben werden muß. Durch die Anordnung mit Prismenschiene wird eine automatische Zentrierung des Werkzeug bezüglich der Querrichtung der Klemmflächen von Spannkonsole und Spannschiene sichergestellt, so daß ein Einrichten der Werkzeuge nur in Längsrichtung der Wangen nötig ist. Hierdurch wird wiederum eine wesentliche Vereinfachung und Beschleunigung des Auswechseln des Werkzeugs gewährleistet. The main advantage of the tool clamping device according to the invention is therefore that the tool exchanged in a few simple steps and in a short amount of time or be moved in the cheek in question can. The tool clamping device according to the invention is particularly advantageous when used for the upper beam tool, the most common in common manufacturing processes must be replaced or postponed. By the arrangement with prism rail an automatic centering of the Tool regarding the transverse direction of the clamping surfaces of the clamping bracket and tensioning rail ensured that setting up the tools are only required in the longitudinal direction of the cheeks. Hereby in turn becomes a significant simplification and acceleration guaranteed to replace the tool.

Gemäß einer bevorzugten Ausführungsform der Erfindung ist es vorgesehen, daß die Betätigungselemente eine Anzahl von Federanordnungen enthalten, durch die die Spannschiene mit einer dauernden zum Kalten des Werkzeugs während des Arbeitsvorgangs genügenden Federkraft im Sinne einer gegenseitigen Annäherung der Klemmflächen von Spannkonsole und Spannschiene beaufschlagt wird. Der wesentliche Vorteil hierbei ist, daß das Werkzeug durch die Federkraft der Federanordnungen unabhängig etwa von einer Hydraulikdruckquelle dauernd und zuverlässig gehalten wird.According to a preferred embodiment of the invention it is envisaged that the actuators a number of spring assemblies included through which the tensioning rail with a permanent to cold the tool during the Sufficient spring force in the sense of a mutual Clamping surfaces of clamping bracket and Tensioning rail is applied. The main advantage here is that the tool by the spring force of the spring assemblies regardless of a hydraulic pressure source is kept permanently and reliably.

Eine besonders vorteilhafte Weiterbildung der vorgenannten Ausführungsform besteht darin, daß die Betätigungselemente eine Anzahl von Hydraulikzylindern enthalten, durch die die Spannschiene mit einer die Kraft der Federelemente überschreitenden Kraft im Sinne des gegenseitigen Entfernens der Klemmflächen von Spannkonsole und Spannschiene voneinander weg beaufschlagbar ist. In dieser Kombination ist es möglich, das Werkzeug durch die Beaufschlagung der Hydraulikzylinder schnell und leicht durch Lösen der Spannschiene von der Spannkonsole lösen und danach wieder festklemmen zu können, wobei im geklemmten Zustand das Werkzeug dann wieder dauerhaft und zuverlässig durch die Federkraft der Federanordnungen gehalten ist.A particularly advantageous development of the aforementioned Embodiment is that the actuators contain a number of hydraulic cylinders, through which the tensioning rail with the force of the spring elements exceeding force in the sense of mutual Removing the clamping surfaces of the clamping bracket and clamping rail can be applied away from each other. In this combination it is possible to apply the tool the hydraulic cylinder quickly and easily by loosening release the tensioning rail from the tensioning bracket and then again to be able to clamp, which in the clamped state Then again permanently and reliably through the tool Spring force of the spring assemblies is held.

Alternativ hierzu kann es jedoch auch vorgesehen sein, daß die Betätigungselemente eine Anzahl von Hydraulikzylindern enthalten, durch die die Klemmschiene im Sinne einer gegenseitigen Annäherung und Entfernung der Klemmflächen von Spannkonsole und Spannschiene zur Spannkonsole zu und von dieser weg bewegbar ist. Hierbei ist jedoch dafür Sorge zu tragen, daß die die Klemmung des Werkzeugs bewirkenden Hydraulikzylinder ständig von einem überwachten Hyraulikdruck beaufschlagt werden, da andernfalls ein Lösen des Werkzeugs die Folge sein kann.Alternatively, however, it can also be provided that that the actuators have a number of hydraulic cylinders included, through which the clamping rail in the sense of a mutual approach and removal of the clamping surfaces from tensioning bracket and tensioning rail to the tensioning bracket to and from this can be moved away. However, this is a concern to bear that causing the clamping of the tool Hydraulic cylinders constantly monitored by a hydraulic pressure be applied, otherwise a loosening of the Tool can be the result.

Gemäß einer weiteren, besonders vorteilshaften Ausführungsform der Erfindung ist es vorgesehen, daß jede Federanordnung in einer senkrecht zur Klemmfläche verlaufenden Bohrung in der Spannkonsole versenkt angeordnet ist und ein Federelement und einen von der der Spannschiene abgewandten Seite der Spannkonsole her durch eine Bohrung mit kleinerem Durchmesser als die die Federanordnung beherbergende Bohrung durch die Spannkonsole hindurchgehend in ein Gewinde in der Spannschiene eingeschraubten Schraubbolzen enthält, wobei sich das Federelement mit seinem einen Ende gegen den Kopf des Schraubbolzens und mit seinem anderen Ende gegen eine Anlagefläche an der Spannkonsole abstützt. Der Vorteil hiervon ist, daß die Spannkonsole auf diese Weise mit den gleichen oder ähnlichen Abmessungen und mit gleichen Befestigungsteilen zum Befestigen an der entsprechenden Wange versehen sein kann, wie die Spannkonsole für eine herkömmliche manuelle Befestigung mittels Schraubbolzen. Bei gleicher Bemessung und Lage der Klemmflächen für das Werkzeug können dann vorteilhafterweise die gleichen Werkzeuge wie bei einer manuellen Spannvorrichtung weiterverwendet werden.According to a further, particularly advantageous embodiment the invention provides that each spring arrangement in a perpendicular to the clamping surface Hole in the clamping bracket is sunk and a spring element and one facing away from the tensioning rail Side of the clamping bracket through a hole smaller diameter than that accommodating the spring arrangement Drilling through the clamping bracket into one Threaded screw bolts screwed into the clamping rail contains, the spring element with one end against the head of the bolt and with his other Support the end against a contact surface on the clamping bracket. The advantage of this is that the clamping bracket on this Way with the same or similar dimensions and with same fastening parts for fastening to the corresponding Cheek can be provided, such as the clamping console for a conventional manual fastening using bolts. With the same dimensioning and position of the clamping surfaces for the tool can then advantageously be the same Tools used as in a manual clamping device will.

Vorteilhafterweise ist es vorgesehen, daß jedes Federelement in einem Paket von übereinander angeordneten Tellerfedern besteht. Mit einer solchen Anordnung von Tellerfedern ist es möglich, bei einer sehr kompakten Federanordnung eine hohe Federkraft zu erzeugen.It is advantageously provided that each spring element in a package of stacked disc springs consists. With such an arrangement of disc springs it is possible with a very compact spring arrangement to generate a high spring force.

Von besonderem Vorteil ist es, wenn die Hydraulikzylinder in einer Reihe in einem zentralen Bereich bezüglich der Querrichtung der Spannkonsole angeordnet sind und wenn die Federanordnungen in Reihen beiderseits der Reihe von Hydraulikzylindern angeordnet sind. Hierdurch wird eine gleichmäßige Verteilung der das Schließen der Spannvorrichtung bewirkenden Kräfte der Federanordnungen und der das Öffnen der Spannvorrichtung bewirkenden Kräfte der Hydraulikzylinder sichergestellt.It is particularly advantageous if the hydraulic cylinder in a row related to a central area the transverse direction of the clamping bracket are arranged and if the spring arrangements in rows on either side of the row of Hydraulic cylinders are arranged. This will create a even distribution of the closing of the tensioning device effective forces of the spring assemblies and that Opening the clamping device causing forces of the hydraulic cylinders ensured.

Hierbei hat es sich als besonders vorteilhaft erwiesen, wenn die Federanordnungen und die Hydraulikzylinder jeweils in Gruppen von vier Federanordnungen und einem im Zentrum der vier Federanordnungen befindlichen Hydraulikzylinder angeordnet sind. It has proven particularly advantageous here if the spring assemblies and the hydraulic cylinders each in groups of four spring arrangements and one in Center of the four spring assemblies located hydraulic cylinders are arranged.

Im folgenden wird ein Ausführungsbeispiel der Erfindung anhand der Zeichnung erläutert.The following is an embodiment of the invention explained using the drawing.

In den Figuren zeigen:

  • Fig. 1 einen Schnitt quer durch die Oberwange einer Schwenkbiegemaschine mit einem daran mittels Spannkonsole und Spannschiene befestigten Werkzeug;
  • Fig. 1a einen vergrößerten Ausschnitt aus Fig. 1;
  • Fig. 2a und 2b jeweils die Untersicht bzw. Draufsicht auf die Spannkonsole und Spannschiene bei dem in Fig. 1 im Querschnitt dargestellten Ausführungsbeispiel der Erfindung;
  • Fig. 3a und 3b Querschnitte durch die Anordnung von Spannkonsole und Spannschiene zusammen mit einem dadurch gehaltenen Werkzeug im geklemmten bzw. gelösten Zustand längs der Linie A-A in Fig. 2b; und
  • Fig. 4a und 4b Querschnitte durch die Anordnung von Spannkonsole und Spannschiene zusammen mit einem dadurch gehaltenen Werkzeug im geklemmten bzw. gelösten Zustand längs der Linie C-C in Fig. 2b.
    • The figures show:
  • 1 shows a section across the upper cheek of a folding machine with a tool attached to it by means of a clamping bracket and clamping rail;
  • 1a shows an enlarged detail from FIG. 1;
  • 2a and 2b each the bottom view and top view of the tensioning bracket and tensioning rail in the embodiment of the invention shown in cross section in FIG. 1;
  • 3a and 3b cross sections through the arrangement of the clamping bracket and clamping rail together with a tool held thereby in the clamped or released state along the line AA in Fig. 2b; and
  • 4a and 4b cross sections through the arrangement of the clamping bracket and clamping rail together with a tool held thereby in the clamped or released state along the line CC in Fig. 2b.

    • Fig. 1 zeigt im Querschnitt die Oberwange 14 einer Schwenkbiegemaschine mit einer daran durch Schraubbolzen 15 und Paßstifte 16 befestigten Spannkonsole 1. Die Spannkonsole 1 dient zusammen mit einer Spannschiene 6 der Befestigung eines Oberwangenwerkzeugs 11, das hier in Form einer Geißfußschiene dargestellt ist. Das Werkzeug 11 ist zwischen einer Klemmfläche 1a an der Unterseite der Spannkonsole 1 und einer Klemmfläche 6a an der Oberseite der Spannschiene 6 eingeklemmt.Fig. 1 shows in cross section the upper cheek 14 Folding machine with a bolt 15 attached to it and dowel pins 16 attached tensioning bracket 1. The tensioning bracket 1 is used together with a tensioning rail 6 for fastening an upper beam tool 11, which here in the form of a Gooseneck splint is shown. The tool 11 is between a clamping surface 1a on the underside of the clamping bracket 1 and a clamping surface 6a on the top of the tensioning rail 6 pinched.

    Wie aus dem in Fig. 1 vergrößert dargestellten Ausschnitt aus Fig. 1 ersichtlich ist, ist an der Unterseite der Spannkonsole 1 sich in deren Längsrichtung erstreckend eine Prismenschiene 2 angeordnet, die im geklemmten Zustand des Werkzeugs 11 in eine an dessen Oberseite, ebenfalls sich in dessen Längsrichtung erstreckend angeordnete prismenförmige Nut 2a eingreift. Auf diese Weise ist im gespannten Zustand das Werkzeug 11 bezüglich der Querrichtung fixiert.As from the detail shown in Fig. 1 enlarged 1 is on the bottom the tensioning bracket 1 extending in the longitudinal direction a prism rail 2 arranged in the clamped state of the tool 11 in one on its top, likewise extending in the longitudinal direction arranged prismatic Groove 2a engages. This way, I'm excited State the tool 11 with respect to the transverse direction fixed.

    Wie aus der in Fig. 2b gezeigten Draufsicht auf die Spannkonsole 1 und das daran angeklemmte Werkzeug 11 und die in den Fig. 4a und 4b gezeigte Querschnittsansicht durch die Spannkonsole 1, die Spannschiene 6 und das dadurch gehaltene Werkzeug 11 ersichtlich ist, sind in der Spannkonsole 1 in regelmäßigen Abständen Bohrungen 9d in zwei in Längsrichtung der Spannkonsole 1 verlaufenden Reihen vorgesehen. In jeder der Bohrungen 9d ist eine Federanordnung beherbergt, die aus einem Federelement 8 in Form von einem Paket von Tellerfedern und einem Schraubbolzen 9 besteht. Der Schraubbolzen 9 verläuft von der der Spannschiene 6 abgewandten Seite der Spannkonsole 1 her durch eine Bohrung 9a am Boden der die Federanordnung 8, 9 beherbergenden Bohrung 9d mit kleinerem Durchmesser als letztere durch die Spannkonsole 1 hindurch in ein Gewinde in der Spannschiene 6. Das durch die Tellerfedern gebildete Federelement 8 stützt sich mit seinem einen Ende gegen den Kopf 9b des Schraubbolzens 9 ab und mit seinem anderen Ende gegen eine Anlagefläche 9c am Boden der Bohrung 9d. Somit ist die Federanordnung 8, 9 vollständig in der Spannkonsole 1 versenkt angeordnet.As from the plan view shown in Fig. 2b on the Clamping bracket 1 and the tool 11 and clamped thereon the cross-sectional view shown in Figs. 4a and 4b through the clamping bracket 1, the clamping rail 6 and thereby held tool 11 can be seen in the Tensioning bracket 1 bores 9d in regular intervals two rows running in the longitudinal direction of the clamping bracket 1 intended. There is a spring arrangement in each of the bores 9d houses from a spring element 8 in the form from a package of disc springs and a bolt 9 consists. The bolt 9 runs from that of the tensioning rail 6 opposite side of the clamping bracket 1 ago a bore 9a at the bottom of the spring assembly 8, 9 accommodating Hole 9d with a smaller diameter than the latter through the clamping console 1 into a thread in the Tensioning rail 6. The spring element formed by the disc springs 8 rests with one end against the head 9b of the bolt 9 and with its other end against a contact surface 9c at the bottom of the bore 9d. So is the spring arrangement 8, 9 completely in the clamping bracket 1 arranged sunk.

    Die Federanordnungen 8, 9 bewirken, daß die Spannschiene 6 mit einer dauernden Kraft zum Halten des Werkzeugs 11 im Sinne einer gegenseitigen Annäherung der Klemmflächen 1a, 6a von Spannkonsole 1 und Spannschiene 6 beaufschlagt wird. Dabei ist die Federkraft der Federelemente 8 so gewählt, daß die Kraft zum Halten des Werkzeugs während des Arbeitsvorgangs sicher gewährleistet ist. Bei dem Ausführungsbeispiel beträgt die Klemmkraft der Federelemente 8 7.500 N oder mehr pro 100 mm Länge der Spannkonsole 1. The spring assemblies 8, 9 cause the tensioning rail 6 with a permanent force to hold the tool 11 in the sense of mutual approximation of the clamping surfaces 1a, 6a acted upon by tensioning bracket 1 and tensioning rail 6 becomes. The spring force of the spring elements 8 chosen so that the force to hold the tool during the work process is guaranteed. In the embodiment is the clamping force of the spring elements 8 7,500 N or more per 100 mm length of the clamping bracket 1.

    Wie weiterhin aus den beiden in Fig. 2a und 2b gezeigten Ansichten und aus den in Fig. 3a und 3b gezeigten Schnittdarstellungen ersichtlich ist, sind in der Klemmkonsole 1 weiterhin in regelmäßigen Abständen in einer Reihe eine Anzahl von Hydraulikzylindern 3 angeordnet, die dem Lösen der durch die Spannkonsole 1 und die Spannschiene 6 gebildeten Spannvorrichtung dienen.As further shown from the two in Fig. 2a and 2b Views and from those shown in Figs. 3a and 3b Sectional representations can be seen in the clamping console 1 continues in a row at regular intervals a number of hydraulic cylinders 3 arranged, the Loosen the through the tensioning bracket 1 and the tensioning rail 6 serve clamping device.

    Wie aus Fig. 3a ersichtlich ist, enthält jeder Hydraulikzylinder 3 eine Zylinderbohrung 3a und einen darin verschieblich angeordneten Kolben 3b. Der Kolben 3b verfügt über einen Führungsring 5, durch den ein Verkippen in der Zylinderbohrung 3a verhindert wird, sowie über einen Nutring 4, der die Abdichtung des Kolbens 3b gegen die Zylinderbohrung 3a sicherstellt. Von dem Inneren des Hydraulikzylinders 3 verläuft in dessen oberen Bereich eine Zulaufbohrung 3c zur Außenseite der Spannkonsole 1. Die Zulaufleitung 3c verläuft senkrecht zur Achse der Zylinderbohrung 3a und senkrecht zur Längsachse der Spannkonsole 1.As can be seen from Fig. 3a, each hydraulic cylinder contains 3 a cylinder bore 3a and one displaceable therein arranged piston 3b. The piston 3b has via a guide ring 5, through which a tilting in the Cylinder bore 3a is prevented, as well as via a grooved ring 4, the sealing of the piston 3b against the cylinder bore 3a ensures. From the inside of the hydraulic cylinder 3 runs in the upper area of an inlet hole 3c to the outside of the tensioning bracket 1. The supply line 3c runs perpendicular to the axis of the cylinder bore 3a and perpendicular to the longitudinal axis of the clamping bracket 1.

    Wie aus Fig. 2a ersichtlich ist, sind die Zulaufbohrungen 3a aller Hydraulikzylinder 3 über Hydraulikanschlüsse 10 an eine gemeinsame Hydraulikleitung 12 angeschlossen. Die Hydraulikleitung 12 wird von einer nicht dargestellten Antriebseinrichtung mit Druck versorgt, wobei diese Antriebseinrichtung vorzugsweise eine Hydraulikpumpe und einen Druckspeicher zum Halten des Hydraulikdrucks aufweist.As can be seen from Fig. 2a, the inlet bores 3a of all hydraulic cylinders 3 via hydraulic connections 10 connected to a common hydraulic line 12. The hydraulic line 12 is not one shown drive device supplied with pressure, wherein this drive device preferably a hydraulic pump and has an accumulator for maintaining the hydraulic pressure.

    Wenn die Kolben 3b der Hydraulikzylinder 3 mit einem ausreichend großen Druck beaufschlagt werden, wird die Spannschiene 6 gegen die von den Federelementen 8 erzeugte Federkraft von der Spannkonsole 1 weggedrückt, so daß das Werkzeug 11 zwischen den Klemmflächen 1a und 6a der Spannkonsole 1 bzw. der Spannschiene 6 freigegeben wird. Der Weg, um welchen die Spannschiene 6 von der Spannkonsole 1 weggedrückt werden kann, ist begrenzt durch von der Unterseite der Spannschiene 6 her durch in dieser vorgesehene Bohrungen in die Spannkonsole 1 eingeschraubte Schraubbolzen 7, die sich mit ihren Köpfen gegen Anlageflächen 7b der Spannschiene 6 abstützen. Mit diesen Schraubbolzen 7 kann der Hub zwischen vollständig geklemmter und vollständig gelöster Stellung der Spannschiene 6 eingestellt werden. Der Hub kann etwa zwischen ein und vier Millimeter betragen, bei dem dargestellten Ausführungsbeispiel beträgt er 2 mm. Die Höhe der Prismenschiene 2 über der Klemmfläche 1a ist in diesem Fall mit 1,5 mm geringer ausgelegt als der Hub von 2 mm, so daß das Werkzeug 11 mit einem dann noch verbleibenden Spiel von 0,5 mm zwischen die Spannkonsole 1 und die Spannschiene 6 eingefügt werden kann. Wenn dann die Hydraulikzylinder 3 von dem Hydraulikdruck entlastet werden, wird die Spannschiene 6 wieder durch die Kraft der Federelemente 8 über die Schraubbolzen 9 an die Spannkonsole 1 herangezogen, wobei das Werkzeug 11 unter gleichzeitiger Zentrierung durch die Prismenschiene 2 zwischen Spannkonsole 1 und Spannschiene 6 geklemmt wird. Die Hubkraft der Hydraulikzylinder 3 muß zum Überwinden der Wirkung der Federelemente 8 größer als deren Klemmkraft sein, und beträgt bei dem Ausführungsbeispiel 12.000 N oder mehr pro 100 mm Länge der Spannkonsole 1, wodurch die Federelemente 8 bis zu ihrer Endkraft am Ende des Hubweges komprimiert werden können.If the piston 3b of the hydraulic cylinder 3 with a sufficiently large pressure will be applied Tensioning rail 6 against that generated by the spring elements 8 Spring force pushed away from the tensioning bracket 1, so that Tool 11 between the clamping surfaces 1a and 6a of the clamping console 1 or the tensioning rail 6 is released. Of the Path by which the tensioning rail 6 is removed from the tensioning bracket 1 can be pushed away is limited by from the bottom the tensioning rail 6 ago by provided in this Bores screwed into the clamping bracket 1 7, with their heads against contact surfaces 7b Support the tensioning rail 6. With these bolts 7 can the stroke between fully clamped and fully released Position of the clamping rail 6 can be adjusted. Of the Stroke can be between one and four millimeters, in the illustrated embodiment, it is 2 mm. The height of the prism rail 2 is above the clamping surface 1a in this case 1.5 mm smaller than the stroke of 2 mm, so that the tool 11 with a remaining one Clearance of 0.5 mm between the clamping console 1 and the tensioning rail 6 can be inserted. If so Hydraulic cylinder 3 are relieved of the hydraulic pressure, is the tensioning rail 6 again by the force of the spring elements 8 via the bolts 9 to the clamping bracket 1 used, the tool 11 with simultaneous Centering through the prism rail 2 between the clamping bracket 1 and clamping rail 6 is clamped. The lifting capacity of the Hydraulic cylinder 3 must overcome the action of the spring elements 8 be greater than their clamping force, and is in the embodiment, 12,000 N or more per 100 mm Length of the clamping bracket 1, whereby the spring elements 8 to be compressed to their final force at the end of the stroke can.

    Bei dem Ausführungsbeispiel sind, wie bereits oben erwähnt wurde, die Hydraulikzylinder 3 in einer Reihe im zentralen Bereich bezüglich der Querrichtung der Spannkonsole 1 angeordnet, wogegen die durch die Federelemente 8 und die Schraubbolzen 9 gebildeten Federelemente in Reihen beiderseits der Reihe von Hydraulikzylindern 3 angeordnet sind. Auf diese Weise sind die Federanordnungen 8, 9 und die Hydraulikzylinder 3 jeweils in Gruppen von vier Federanordnungen 8, 9 und einem im Zentrum der besagten vier Federanordnungen befindlichen Hydraulikzylinder 3 angeordnet. Mit anderen Worten, bei dem Ausführungsbeispiel wirken jeweils vier Federanordnungen 8, 9 mit einem Hydraulikzylinder 3 zusammen, so daß ein Hydraulikzylinder in der Lage sein muß, die von den Federelementen 8 von vier Federanordnungen 8, 9 bewirkte Klemmkraft zu überwinden. Bei dem Ausführungsbeispiel beträgt der dafür erforderliche Druck bei der genannten Hubkraft von 12.000 N pro 100 mm Länge der Spannkonsole 250 bar.In the embodiment, as already mentioned above was, the hydraulic cylinder 3 in a row in the central Area related to the transverse direction of the tensioning bracket 1 arranged, whereas the by the spring elements 8 and Bolt 9 spring elements formed in rows on both sides the series of hydraulic cylinders 3 are arranged. In this way, the spring assemblies 8, 9 and Hydraulic cylinder 3 each in groups of four spring arrangements 8, 9 and one in the center of said four spring arrangements located hydraulic cylinder 3 arranged. With in other words, each work in the exemplary embodiment four spring arrangements 8, 9 with a hydraulic cylinder 3 together so that a hydraulic cylinder will be able to must by the spring elements 8 of four spring assemblies 8, 9 to overcome clamping force. In the embodiment the required pressure at lifting capacity of 12,000 N per 100 mm length of the clamping bracket 250 bar.

    Die Hydraulikzylinder 3 sind jeweils in Abständen von 100 mm angeordnet, so daß pro 100 mm Länge der Spannkonsole 1 ein Hydraulikzylinder und vier Federanordnungen 8, 9 vorgesehen sind. Selbstverständlich können anstelle dieser Anordnung auch andere Anordnungen gewählt werden, beispielsweise solche, bei denen jeweils ein Hydraulikzylinder dazu vorgesehen ist, die Klemmkraft von zwei Federanordnungen zu überwinden, oder andere geeignete Anordnungen.The hydraulic cylinders 3 are each at intervals of 100 mm arranged so that per 100 mm length of the clamping bracket 1 a hydraulic cylinder and four spring assemblies 8, 9 are provided are. Of course, instead of this arrangement other arrangements can be chosen, for example those, each with a hydraulic cylinder is provided to the clamping force of two spring assemblies overcome, or other suitable arrangements.

    Claims (20)

    1. Tool clamping device for the upper cheek, lower cheek or bending cheek tool of a swivel bending machine, in which the tool (11) is supported clamped by means of a clamping bar (6) between a clamping surface (1a) of a clamping bracket (1) located on the upper, lower or bending cheek and a clamping surface (6a) of the clamping bar (6) located on the clamping bracket (1), in which due to a number of actuating members (3, 8, 9) arranged to be functionally operative in the clamping bracket (1) in the direction at right angles to the clamping surfaces (1a, 6a) of the clamping bracket (1) and clamping bar (6), optionally for clamping the tool (11), the clamping bar (6) is movable towards the clamping bracket (1) in the direction of a mutual approach of the clamping surfaces (1a, 6a) of the clamping bracket (1) and clamping bar (6) and for releasing the tool (11) can be moved away from the clamping bracket (1) in the direction of a mutual separation of the clamping surfaces (1a, 6a) of the clamping bracket (1) and clamping bar (6), characterised in that located on the clamping surface (1a) of the clamping bracket (1) is a prism bar (2) extending parallel to the longitudinal direction of the clamping bracket (1) and that the tool (11) contains a groove constructed prismatically and extending parallel to its longitudinal direction, in which groove the prism bar (2) engages at the time of clamping and centres the tool.
    2. Clamping device according to Claim 1, characterised in that the actuating members (3, 8, 9) contain a number of spring arrangements (8, 9), by which the clamping bar (6) is acted upon with a lasting spring force sufficient for holding the tool during the machining process, in the direction of a mutual approach of the clamping surfaces (1a, 6a) of the clamping bracket (1) and clamping bar (6).
    3. Clamping device according to Claim 2, characterised in that the actuating members (3, 8, 9) contain a number of hydraulic cylinders (3), by which the clamping bar (6) can be acted upon by a force exceeding the force of the spring members (8, 9), in the direction of the mutual separation of the clamping surfaces (1a, 6a) of the clamping bracket (1) and clamping bar (6) away from each other.
    4. Clamping device according to Claim 1, characterised in that the actuating members contain a number of hydraulic cylinders, by which the clamping bar (6) can be moved towards the clamping bracket (1) and away from the latter, in the direction of a mutual approach and separation of the clamping surfaces (1a, 6a) of the clamping bracket (1) and clamping bar (6).
    5. Clamping device according to Claim 2 or 3, characterised in that each spring arrangement (8, 9) is countersunk in a bore (9d) extending at right angles to the clamping surface (1a), in the clamping bracket (1) and contains a spring member (8) and a screw bolt (9) screwed into a screw thread in the clamping bar (6), passing from the side of the clamping bracket (1) remote from the clamping bar (6) through a bore (9a) with a smaller diameter than the bore (9d) housing the spring arrangement (8, 9), through the clamping bracket (1), in which case the spring member (8) is supported by its one end against the head (9b) of the screw bolt (9) and by its other end against a contact face (9c) on the clamping bracket (1).
    6. Clamping device according to Claim 5, characterised in that each spring member (8) consists of a set of cup springs arranged one above the other.
    7. Clamping device according to one of Claims 1 to 6, characterised in that the distance by which the clamping bar (6) can be moved away from the clamping bracket (1) in a direction at right angles to the plane of the clamping surfaces (1a, 6a) of the clamping bracket (1) or clamping bar (6), is defined by screw bolts (7), which are screwed from the side of the clamping bar (6) remote from the clamping bracket (1), through bores provided in the latter into the clamping bracket (1), in which case the stroke is fixed by a defined distance between the head of the screw bolt (7) and a corresponding contact face (7b) on the clamping bar (6).
    8. Clamping device according to one of Claims 3 to 7, characterised in that each hydraulic cylinder (3) contains a cylinder bore (3a) extending at right angles to the clamping surfaces (1a, 6a) and a piston (3b) arranged to slide therein.
    9. Clamping device according to one of Claims 2 to 8, characterised in that for the mounting of the upper cheek tool, the clamping surfaces (1a, 6a) of the clamping bracket (1) and clamping bar (6) lie in a horizontal plane and that the bores (9d) housing the spring arrangements (8, 9) and the cylinder bores (3a) extend vertically.
    10. Clamping device according to one of Claims 2 to 9, characterised in that the number of spring arrangements (8, 9) and the number of hydraulic cylinders (3) are distributed at regular intervals over the length of the clamping bracket (1).
    11. Clamping device according to Claim 10, characterised in that the hydraulic cylinders (3) are arranged in a row in a central region with respect to the transverse direction of the clamping bracket (1) and that the spring arrangements (8, 9) are arranged in rows on both sides of the row of hydraulic cylinders (3).
    12. Clamping device according to Claim 11, characterised in that the spring arrangements (8, 9) and the hydraulic cylinders (3) are arranged respectively in groups of four spring arrangements (8, 9) and one hydraulic cylinder (3) located in the centre of the four spring arrangements (8, 9).
    13. Clamping device according to one of Claims 3 to 12, characterised in that extending from each hydraulic cylinder (3) is an inlet bore (3c) in the direction at right angles to the axis of the cylinder bore (3a) and at right angles to the longitudinal axis of the clamping bracket (1) towards its outside, and that the inlet bores (3c) are connected by way of hydraulic connections (10) to a common hydraulic line (12).
    14. Clamping device according to one of Claims 3 to 13, characterised by a drive device for the hydraulic actuation of the hydraulic cylinders (3).
    15. Clamping device according to Claim 14, characterised in that the drive device contains a hydraulic pump and an accumulator for maintaining the hydraulic pressure.
    16. Clamping device according to one of Claims 2 to 15, characterised in that the spring arrangements (8, 9) produce a clamping force of 7,500 N or more per 100 mm length of the clamping bracket (1).
    17. Clamping device according to one of Claims 3 to 16, characterised in that the hydraulic cylinders (3) produce a lifting force of 12,000 N or more per 100 mm length of the clamping bracket (1).
    18. Clamping device according to one of Claims 1 to 17, characterised in that the stroke brought about by the actuating members (3, 8, 9) amounts to between 1 and 4 mm.
    19. Clamping device according to Claim 18, characterised in that the stroke amounts to 2 mm.
    20. Clamping device according to Claim 19, characterised in that the height of the prism bar (2) above the clamping surface (1a) amounts to 1.5 mm.
    EP95103500A 1994-03-11 1995-03-10 Tool clamping device for a bending press Expired - Lifetime EP0671227B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    DE9404171U 1994-03-11
    DE9404171U DE9404171U1 (en) 1994-03-11 1994-03-11 Tool clamping device for the tool of a folding machine

    Publications (2)

    Publication Number Publication Date
    EP0671227A1 EP0671227A1 (en) 1995-09-13
    EP0671227B1 true EP0671227B1 (en) 1998-09-02

    Family

    ID=6905858

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP95103500A Expired - Lifetime EP0671227B1 (en) 1994-03-11 1995-03-10 Tool clamping device for a bending press

    Country Status (3)

    Country Link
    EP (1) EP0671227B1 (en)
    AT (1) ATE170433T1 (en)
    DE (2) DE9404171U1 (en)

    Families Citing this family (1)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    DE102004022643A1 (en) * 2004-05-07 2005-12-15 Hans Schröder Maschinenbau GmbH Folding Machine

    Family Cites Families (3)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    US2302958A (en) * 1940-07-13 1942-11-24 Whitney Metal Tool Company Bending brake
    GB612321A (en) * 1945-01-09 1948-11-11 Lee Britton Green Improvements in or relating to bending machines
    US5065610A (en) * 1990-03-12 1991-11-19 Kabushiki Kaisha Kosmek Clamping apparatus for press brake

    Also Published As

    Publication number Publication date
    ATE170433T1 (en) 1998-09-15
    DE59503397D1 (en) 1998-10-08
    DE9404171U1 (en) 1994-06-30
    EP0671227A1 (en) 1995-09-13

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