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EP0543772A1 - Press - Google Patents

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Publication number
EP0543772A1
EP0543772A1 EP92810802A EP92810802A EP0543772A1 EP 0543772 A1 EP0543772 A1 EP 0543772A1 EP 92810802 A EP92810802 A EP 92810802A EP 92810802 A EP92810802 A EP 92810802A EP 0543772 A1 EP0543772 A1 EP 0543772A1
Authority
EP
European Patent Office
Prior art keywords
press
cheek
press according
parts
gaps
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.)
Withdrawn
Application number
EP92810802A
Other languages
German (de)
French (fr)
Inventor
Waldemar Krumholz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
M&S Brugg AG
Original Assignee
M&S Brugg AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by M&S Brugg AG filed Critical M&S Brugg AG
Publication of EP0543772A1 publication Critical patent/EP0543772A1/en
Withdrawn legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D5/00Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/02Bending sheet metal along straight lines, e.g. to form simple curves on press brakes without making use of clamping means
    • B21D5/0272Deflection compensating means
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B30PRESSES
    • B30BPRESSES IN GENERAL
    • B30B15/00Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/007Means for maintaining the press table, the press platen or the press ram against tilting or deflection

Definitions

  • the invention relates to a press with at least two parallel press beams, which are located opposite one another along the work site and can be moved against one another transversely to their longitudinal extent under the influence of press forces, the press forces acting punctually in the region of the two longitudinal ends of the press beams.
  • the invention relates to a particular embodiment of such presses, namely a press brake with press beams arranged one above the other, e.g. in the form of a vertically movable upper cheek, at the two ends of which the pressing forces are introduced, and a lower cheek lying freely at both ends.
  • Press brakes of this type are known to have the disadvantage that, without special measures, the upper beam and the lower beam bend in opposite directions under load and therefore form an uneven working gap between the upper and lower tool.
  • This disadvantage has a particularly strong effect on large press brakes with a passage several meters wide between the stands and especially when machining workpieces, the width of which is significantly less than the total working width of the cheeks.
  • the lower part of the upper cheek is divided horizontally into several cheek parts, each of which is connected to a power cylinder, the counterforce of which can be controlled in accordance with the load on the respective cheek part.
  • So-called hydro cushions for changing the load distribution on the various cheek parts have also been proposed for this purpose. All these known solutions have the disadvantage that the means for generating the counterforces and for controlling these counterforces are enormously complex owing to constantly changing load distributions and make the manufacture and operation of such press brakes considerably more expensive.
  • the invention now shows another way to achieve the desired goal with simpler and less complex means, namely to exert a uniform force influence on the workpiece over the entire width of the cheek.
  • this object is achieved in that at least one of the two press beams is divided into two, the division extending transversely to the course of the press forces, and with the two beam parts abutting one another in the middle of the beam at a butt joint and on both sides of the butt joint by a gap with up to End of the beam towards the constantly increasing gap width are separated from each other, and that the force application points of the two-part press beam are on the part of the beam facing away from the work place.
  • the press beams bend in the same direction under load at the edges opposite each other at the work place, by increasing the flexibility of the beam part of the two-part press beam adjoining the work place on its sides in such a way that this beam part is inevitably one under load assumes a convex shape, in contrast to a one-piece press beam, which is always concavely bent under the same circumstances.
  • the proposed measure can be used both on a movable and on a fixed press beam and can affect both only one and both press beams. In the latter case, it is even possible to linearize the course of the working gap between the two press beams under load.
  • the effect of the measure according to the invention is essentially independent of whether the movement plane of the press bars runs vertically, horizontally or obliquely.
  • this plane of movement is normally vertical, with either the upper cheek or the lower cheek being movable and the counter cheek being fixed.
  • the weight of the cheeks or cheek parts must also be included in the calculation of the deflection lines in addition to the pressing forces.
  • the width of the columns (19) at the bar ends (20) is in the unloaded state of the divided one
  • the press beam is expediently chosen such that it corresponds in size to the maximum deflection occurring under load under the same conditions on the undivided press beam.
  • the gap width at the bar ends is preferably at least as large as the maximum deflection of an undivided press bar opposite the divided press bar, which occurs at maximum pressing force.
  • both press beams are divided into two, it is more advantageous if the width of the gaps at the beam ends is at most as large as the maximum deflection occurring on the undivided press beams under the same conditions.
  • these coupling links can be used to hold the two beam parts loosely together at the joint and to absorb the weight of the lower cheek part.
  • These coupling members are preferably arranged in the area of the bar ends, where they can additionally be designed as a means for stabilizing the bar part adjacent to the work position, for example to prevent this bar part from tipping over an axis lying in the area of the joint.
  • a preferred embodiment of the coupling members mentioned is that they are articulated with both beam parts are connected and that they have an effective freewheel during the pressing process in order to relieve the coupling members during the pressing process.
  • the coupling elements can contain spring elements which are switched on in the force-locking connection thereof. These spring elements are expediently dimensioned such that they hold the two beam parts loosely together when the press beam is not loaded and, in the case of a press brake with a divided upper beam, absorb the weight of the lower beam part.
  • An additional function of these spring elements can consist in damping the force peaks acting on the coupling members at the beginning of the empty stroke of the upper cheek.
  • the coupling elements mentioned can be omitted if the two beam parts of the two-part press beam are firmly connected to one another at the joint, e.g. are screwed.
  • means are advantageously provided in the region of the beam ends of the two-part press beam which guide the two beam parts to one another.
  • the frame of the press brake is essentially composed of two vertical side walls 1 and a yoke beam 2 connecting the side walls 1 to one another on the upper side.
  • the yoke beam is box-shaped and consists of two vertical longitudinal plates 3 and 4, which are connected to one another at the ends by a vertical transverse plate 5.
  • the side walls 1 are each formed from two upstanding plates 6 and 7, which are arranged at a distance from one another leaving a space 8 and are connected to one another at the top by the yoke beam 2 and at the bottom by a web 9.
  • the active parts of the press brake form a fixed lower beam 10 and an upper beam 11, to which the bending tools can be fastened in a manner not shown.
  • the supports 12 On the inside of the two side walls 1 there are two supports 12, which form the bearing block for the lower beam 10 designed as a free-standing beam.
  • the supports 12 are each provided with a semi-cylindrical pan 13.
  • a cylindrical pin 14 is anchored at both, stepped ends of the lower beam 10, which reach between the supports 12 and whose projecting ends rest in the relevant pans 13 of the supports 12.
  • the upper cheek 10 is divided into two in the direction of the force, the upper cheek part 15 and the lower cheek part 17 adjoining the work station 16 abutting one another in the middle of the cheek and on both sides of the joint formed as the butt surface 18 by a gap 19 with a gap width increasing up to the cheek end 20 are separated.
  • the upper cheek part 15 of the upper cheek 10 hangs on its two offset ends from each of two support members 21, which are articulated on the one hand to the upper cheek part 15 and on the other hand to the piston rod 22 of a power cylinder 23, the articulated axis located on the cheek part 15 with 24 and the on the piston rod 18 located hinge axis is designated 25.
  • Each power cylinder 23 is attached to the adjacent cross plate 5 of the yoke beam 2.
  • a spherical butt joint 26 is provided for transmitting the pressing force from the piston rods 22 to the upper cheek part 15 of the upper cheek 10 and for the selective introduction of force into this cheek part 15. The details of this butt connection are not discussed in more detail here.
  • the two cheek parts 15 and 17 of the upper cheek 10 are connected to one another by coupling members 27, which are arranged near the cheek ends 20 and hold the two cheek parts 15, 17 loosely together on the abutment surface 18.
  • the mutual position of the two cheek parts 15, 17 is also secured by a fitting bolt 28 inserted on both sides in the area of the abutting surface 18.
  • the coupling members 27 are formed similarly to the support members 21 and also articulated to the cheek parts 15, 17, the articulation axes being designated 29 and 30.
  • FIG. 3 A preferred embodiment of the coupling members 27 is shown in FIG. 3.
  • the coupling member 27 is divided in the direction of force into an upper part 31 connected to the articulated axis 29 and a lower part 32 connected to the articulated axis 30.
  • the upper part 31 and the lower part 32 are connected to one another by screws 33 which secure the laterally directed legs 35 of the Push through the upper part 31 freely and are screwed into the lower part 32.
  • spring elements 36 for example plate springs, are used, which are dimensioned such that they absorb the weight of the lower cheek part 17 when the upper cheek 10 is empty and hold the two cheek parts 15, 17 loosely together. In this way it is achieved that the lower cheek part 17 assumes a stable position, that is to say it is subjected to bending in the operation of the upper cheek 10 and does not tip without resistance to the upper cheek part 15 in the case of one-sided loading.
  • Fig. 4 for the two cheeks 10 and 11 of the press brake the bending lines 45 and 46 occurring at the work station 16 are drawn in the case of a uniform load over the entire length of the cheeks, the extent of the deflection being shown in an enlarged manner.
  • the two cheeks 10 and 11 bend in the same direction under the influence of the pressing forces F p , the contact forces F a and the cheek weights G o and G u , and the deflection lines 45 and 46 run approximately parallel.
  • the press brake according to the second embodiment according to FIG. 5 differs from that according to FIGS. 1 and 2 essentially only by the means for holding the two cheek parts 15 and 17 of the upper cheek together.
  • the coupling members 27 are omitted the two cheek parts 15 and 17 are firmly connected to one another at the somewhat wider abutting surface, specifically by means of screws 37, which are arranged here in flanges 38, 39 provided on both sides of the cheek parts 15, 17.
  • the flanges 38, 39 can also be omitted and corresponding connecting screws can be arranged within the cheek parts 15, 17, with corresponding recesses, for example in the upper cheek part, for the accessibility of the screw heads 15 would have to be provided.
  • devices 40 for mutually guiding the two cheek parts 15, 17 are provided in the region of the cheek ends.
  • Each of these devices 40 is e.g. 6 from two plates 41 bridging the gap 19 between the two cheek parts 15, 17, which are fastened to the upper cheek part 15 with screws 42 and carry effective guide bodies 43 on the sides of the lower cheek part 17, these guide bodies 43 being set by adjusting screws 44 are axially adjustable.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Presses And Accessory Devices Thereof (AREA)
  • Press Drives And Press Lines (AREA)

Abstract

The press has a vertically movable top beam (10), at the two ends of which the press force (Fp) is introduced, and a bottom beam (11) resting freely against the two ends. The top beam (10) is divided approximately into two in the direction of force, the two beam parts (15, 17) abutting in the middle of the beam and being separated from one another to either side of the abutment (18) by a gap (19) with a width which increases continuously up to the end of the beam. The points of action of the press force (Fp) are located at the upper beam part (15) of the two-part top beam (10). This subdivision of the top beam (10) allows the top beam (10) and the bottom beam (11) to bend in the same direction at the working point (16) under load and the bending lines (45, 46) to run at least approximately parallel. …<IMAGE>…

Description

Die Erfindung betrifft eine Presse mit wenigstens zwei parallelen Pressbalken, welche an der Arbeitsstelle längsseits einander gegenüberliegen und unter dem Einfluss von Presskräften quer zu ihrer Längsausdehnung gegeneinander bewegbar sind, wobei die Presskräfte jeweils im Bereich der beiden Längsenden der Pressbalken punktuell angreifen. Insbesondere betrifft die Erfindung eine besondere Ausführungsform derartiger Pressen, nämlich eine Abkantpresse mit übereinander angeordneten Pressbalken z.B. in Form einer vertikal beweglichen Oberwange, an deren beiden Enden die Presskräfte eingeleitet werden, und einer an den beiden Enden frei aufliegenden Unterwange.The invention relates to a press with at least two parallel press beams, which are located opposite one another along the work site and can be moved against one another transversely to their longitudinal extent under the influence of press forces, the press forces acting punctually in the region of the two longitudinal ends of the press beams. In particular, the invention relates to a particular embodiment of such presses, namely a press brake with press beams arranged one above the other, e.g. in the form of a vertically movable upper cheek, at the two ends of which the pressing forces are introduced, and a lower cheek lying freely at both ends.

Abkantpressen dieser Art haben bekanntlich den Nachteil, dass ohne besonderen Massnahmen die Oberwange und die Unterwange sich unter Belastung gegensinnig durchbiegen und daher einen ungleichmässigen Arbeitsspalt zwischen Ober- und Unterwerkzeug bilden. Besonders stark wirkt sich dieser Nachteil aus bei grossen Abkantpressen mit mehrere Meter breitem Durchgang zwischen den Ständern und vor allem beim Bearbeiten von Werkstücken, deren Breite wesentlich geringer ist als die gesamte Arbeitsbreite der Wangen.Press brakes of this type are known to have the disadvantage that, without special measures, the upper beam and the lower beam bend in opposite directions under load and therefore form an uneven working gap between the upper and lower tool. This disadvantage has a particularly strong effect on large press brakes with a passage several meters wide between the stands and especially when machining workpieces, the width of which is significantly less than the total working width of the cheeks.

Es sind bereits verschiedene Massnahmen vorgeschlagen worden, die zum Ziel haben, durch Korrektur der Durchbiegungslinie wenigstens einer Wange bzw. durch Kompensation der Abweichungen der Durchbiegungslinien von Ober- und Unterwange bezüglich eines parallelen Verlaufs derselben einen über die gesamte Arbeitsbreite konstanten Arbeitsspalt zu erreichen. Die gemeinsame Grundidee dieser Massnahmen besteht darin, durch die Erzeugung von belastungsabhängigen Gegenkräften z.B. in der Oberwange den Verlauf der Durchbiegungslinie der Oberwange demjenigen der Unterwange anzugleichen.Various measures have already been proposed which aim to achieve a working gap which is constant over the entire working width by correcting the deflection line of at least one cheek or by compensating for the deviations of the deflection lines of the upper and lower cheeks with respect to a parallel course of the same. The common basic idea of these measures is to create counter-forces, e.g. to align the curve of the deflection line of the upper beam with that of the lower beam in the upper beam.

Gemäss einer der bekannten Lösungen ist der untere Teil der Oberwange horizontal in mehrere Wangenteile unterteilt, welche mit je einem Kraftzylinder in Verbindung stehen, dessen Gegenkraft nach Massgabe der Belastung des jeweiligen Wangenteils steuerbar ist. Auch sogenannte Hydrokissen zur Änderung der Lastverteilung auf die verschiedenen Wangenteile sind für diesen Zweck vorgeschlagen worden. Allen diesen bekannten Lösungen haftet der Nachteil an, dass die Mittel zur Erzeugung der Gegenkräfte und zur Steuerung dieser Gegenkräfte aufgrund ständig wechselnder Lastverteilungen enorm aufwendig sind und die Herstellung und den Betrieb solcher Abkantpressen erheblich verteuern.According to one of the known solutions, the lower part of the upper cheek is divided horizontally into several cheek parts, each of which is connected to a power cylinder, the counterforce of which can be controlled in accordance with the load on the respective cheek part. So-called hydro cushions for changing the load distribution on the various cheek parts have also been proposed for this purpose. All these known solutions have the disadvantage that the means for generating the counterforces and for controlling these counterforces are enormously complex owing to constantly changing load distributions and make the manufacture and operation of such press brakes considerably more expensive.

Die Erfindung zeigt nun einen anderen Weg, um mit einfacheren und weniger aufwendigen Mitteln das angestrebte Ziel zu erreichen, nämlich einen über die gesamte Wangenbreite gleichmässigen Krafteinfluss auf das Werkstück auszuüben.The invention now shows another way to achieve the desired goal with simpler and less complex means, namely to exert a uniform force influence on the workpiece over the entire width of the cheek.

Diese Aufgabe wird erfindungsgemäss dadurch gelöst, dass wenigstens einer der beiden Pressbalken zweigeteilt ist, wobei die Teilung quer zum Verlauf der Presskräfte verläuft, und wobei die beiden Balkenteile in der Balkenmitte an einer Stossstelle aneinander anliegen und beidseits der Stossstelle durch je einen Spalt mit bis zum Balkenende hin stetig zunehmender Spaltbreite voneinander getrennt sind, und dass sich die Kraftangriffspunkte des zweigeteilten Pressbalkens an dem der Arbeitsstelle abgewandten Balkenteil befinden.According to the invention, this object is achieved in that at least one of the two press beams is divided into two, the division extending transversely to the course of the press forces, and with the two beam parts abutting one another in the middle of the beam at a butt joint and on both sides of the butt joint by a gap with up to End of the beam towards the constantly increasing gap width are separated from each other, and that the force application points of the two-part press beam are on the part of the beam facing away from the work place.

Auf diese Weise erreicht man, dass sich die Pressbalken unter Last an den an der Arbeitsstelle einander gegenüberliegenden Kanten gleichsinnig durchbiegen, indem die Nachgiebigkeit des an die Arbeitsstelle angrenzende Balkenteils des zweigeteilten Pressbalkens nach seinen Seiten hin derart erhöht ist, dass dieser Balkenteil unter Last zwangsläufig eine konvexe Form annimmt, im Gegensatz zu einem einteiligen Pressbalken, welcher unter den gleichen Umständen stets konkav gebogen wird.In this way it is achieved that the press beams bend in the same direction under load at the edges opposite each other at the work place, by increasing the flexibility of the beam part of the two-part press beam adjoining the work place on its sides in such a way that this beam part is inevitably one under load assumes a convex shape, in contrast to a one-piece press beam, which is always concavely bent under the same circumstances.

Durch geeignete Wahl des Querschnittsverlaufs der an die Arbeitsstelle angrenzenden Pressbalken bzw. Balkenteile in Funktion der Balkenlänge lassen sich deren Widerstandsmomente in ihrer Funktion längs der Arbeitsstelle derart aufeinander abstimmen, dass die Durchbiegungslinien der beiden Pressbalken in deren Arbeitsbereich bei jedem Belastungszustand wenigstens annähernd parallel verlaufen.By a suitable choice of the cross-sectional profile of the press beams or beam parts in Function of the beam length, its resistance moments can be coordinated with one another in their function along the work station in such a way that the deflection lines of the two press beams run at least approximately parallel in their working area in every load condition.

Die vorgeschlagene Massnahme ist sowohl an einem beweglichen als auch an einem feststehenden Pressbalken anwendbar und kann sowohl nur einen als auch beide Pressbalken betreffen. Im letzteren Fall ist es sogar möglich, den Verlauf des Arbeitsspaltes zwischen den beiden belasteten Pressbalken zu linearisieren.The proposed measure can be used both on a movable and on a fixed press beam and can affect both only one and both press beams. In the latter case, it is even possible to linearize the course of the working gap between the two press beams under load.

Ferner ist die Wirkung der erfindungsgemässen Massnahme im wesentlichen unabhängig davon, ob die Bewegungsebene der Pressbalken vertikal oder horizontal oder schräg verläuft. Bei Abkantpressen steht diese Bewegungsebene normalerweise senkrecht, wobei entweder die Oberwange oder die Unterwange beweglich und die Gegenwange festehend ist. Selbstverständlich ist bei der vertikalen Anordnung ausser den Presskräften auch das Gewicht der Wangen bzw. Wangenteile in die Berechnung der Durchbiegungslinien mit einzubeziehen.Furthermore, the effect of the measure according to the invention is essentially independent of whether the movement plane of the press bars runs vertically, horizontally or obliquely. In the case of press brakes, this plane of movement is normally vertical, with either the upper cheek or the lower cheek being movable and the counter cheek being fixed. In the vertical arrangement, the weight of the cheeks or cheek parts must also be included in the calculation of the deflection lines in addition to the pressing forces.

Da sich die Spaltbreite bei zunehmender Last infolge zunehmender Durchbiegung des an die Arbeitsstelle angrenzenden Balkenteils vermindert, ist die Breite der Spalten (19) an den Balkenenden (20) im unbelasteten Zustand des geteilten Pressbalkens zweckmässigerweise so gewählt, dass sie grössenordnungsmässig der unter den gleichen Bedingungen am ungeteilten Pressbalken unter Last auftretenden maximalen Durchbiegung entspricht. Vorzugsweise ist die Spaltbreite an den Balkenenden mindestens so gross wie die bei maximaler Presskraft auftretende maximale Durchbiegung eines dem geteilten Pressbalken gegenüberliegenden ungeteilten Pressbalkens. Sofern beide Pressbalken zweigeteilt sind, ist es dagegen vorteilhafter, wenn die Breite der Spalten an den Balkenenden höchstens so gross ist wie die unter den gleichen Bedingungen an ungeteilten Pressbalken auftretende maximale Durchbiegung.Since the gap width decreases with increasing load as a result of increasing deflection of the bar part adjacent to the work position, the width of the columns (19) at the bar ends (20) is in the unloaded state of the divided one The press beam is expediently chosen such that it corresponds in size to the maximum deflection occurring under load under the same conditions on the undivided press beam. The gap width at the bar ends is preferably at least as large as the maximum deflection of an undivided press bar opposite the divided press bar, which occurs at maximum pressing force. In contrast, if both press beams are divided into two, it is more advantageous if the width of the gaps at the beam ends is at most as large as the maximum deflection occurring on the undivided press beams under the same conditions.

Unter Umständen kann es zweckmässig sein, die beiden Balkenteile des geteilten Pressbalkens durch Kopplungsglieder miteinander zu verbinden. Im Falle einer Abkantpresse mit geteilter Oberwange können diese Kopplungsglieder dazu dienen, die beiden Balkenteile an der Stossstelle lose zusammenzuhalten und das Gewicht des unteren Wangenteils aufzunehmen. Vorzugsweise werden diese Kopplungsglieder im Bereich der Balkenenden angeordnet, wo sie zusätzlich als Mittel zur Stabilisierung des an die Arbeitsstelle angrenzenden Balkenteils ausgebildet sein können, um beispielsweise ein Kippen dieses Balkenteils um eine im Bereich der Stossstelle liegende Achse zu verhindern.Under certain circumstances, it may be expedient to connect the two beam parts of the divided press beam to one another by coupling members. In the case of a press brake with a divided upper cheek, these coupling links can be used to hold the two beam parts loosely together at the joint and to absorb the weight of the lower cheek part. These coupling members are preferably arranged in the area of the bar ends, where they can additionally be designed as a means for stabilizing the bar part adjacent to the work position, for example to prevent this bar part from tipping over an axis lying in the area of the joint.

Eine bevorzugte Ausführungsform der genannten Kopplungsglieder besteht darin, dass sie mit beiden Balkenteilen gelenkig verbunden sind und dass sie einen beim Pressvorgang wirksamen Freilauf aufweisen, um die Kopplungsglieder beim Pressvorgang zu entlasten.A preferred embodiment of the coupling members mentioned is that they are articulated with both beam parts are connected and that they have an effective freewheel during the pressing process in order to relieve the coupling members during the pressing process.

Ferner können die Kopplungsglieder in den Kraftschluss derselben eingeschaltete Federelemente enthalten. Zweckmässigerweise sind diese Federelemente so dimensioniert, dass sie bei unbelastetem Pressbalken dessen beide Balkenteile lose zusammenhalten und im Falle einer Abkantpresse mit geteilter Oberwange das Gewicht des unteren Balkenteils aufnehmen. Eine zusätzliche Funktion dieser Federelemente kann darin bestehen, die zu Beginn des Leerhubs der Oberwange auf die Kopplungsglieder einwirkenden Kraftspitzen zu dämpfen.Furthermore, the coupling elements can contain spring elements which are switched on in the force-locking connection thereof. These spring elements are expediently dimensioned such that they hold the two beam parts loosely together when the press beam is not loaded and, in the case of a press brake with a divided upper beam, absorb the weight of the lower beam part. An additional function of these spring elements can consist in damping the force peaks acting on the coupling members at the beginning of the empty stroke of the upper cheek.

Die erwähnten Kopplungsglieder können entfallen, wenn die beiden Balkenteile des zweigeteilten Pressbalkens an der Stossstelle miteinander fest verbunden, z.B. verschraubt sind. Insbesondere in diesem Fall, aber auch beim Vorhandensein von Kopplungsgliedern, sind mit Vorteil im Bereich der Balkenenden des zweigeteilten Pressbalkens Mittel vorgesehen, welche die beiden Balkenteile gegenseitig führen.The coupling elements mentioned can be omitted if the two beam parts of the two-part press beam are firmly connected to one another at the joint, e.g. are screwed. In this case in particular, but also in the presence of coupling members, means are advantageously provided in the region of the beam ends of the two-part press beam which guide the two beam parts to one another.

Bei der praktischen Anwendung des Erfindungsgedankens an einer üblichen Abkantpresse, also an einer Presse mit übereinander angeordneten Pressbalken, welche durch eine vertikal bewegliche Oberwange, an deren beiden Enden die Presskraft eingeleitet wird, und eine an den beiden Enden frei aufliegende Unterwange gebildet sind, hat sich eine Anordnung als vorteilhaft erwiesen, bei der die Oberwange vertikal zweigeteilt ist und die Spalten von der Stossstelle bis zur seitlichen Begrenzung der Oberwange hin geradlinig verlaufen und in einem bestimmten Winkel nach unten geneigt sind. Günstige Verhältnisse ergeben sich, wenn der Neigungswinkel der Spalten in Abhängigkeit vom Widerstandsmoment der Oberwange in Funktion der Wangenlänge gewählt ist und wenigstens annähernd der Hälfte der mittleren Steigung dieser Funktion entspricht. In erster Annäherung führt dies zu einer Konstruktion, bei welcher die Oberwange bei gerader Unterkante des unteren Balkenteils eine Gesamthöhe hat, welche von der Wangenmitte zu den Wangenenden hin abnimmt, und bei welcher der Neigungswinkel der Spalten etwa der Hälfte des mittleren Neigungswinkels der Oberkante des oberen Balkenteils beträgt.In the practical application of the concept of the invention to a conventional press brake, that is to say to a press with press beams arranged one above the other, which is pressed by a vertically movable upper beam, at both ends of which the pressing force is introduced, and one lying freely at both ends Lower cheek are formed, an arrangement has proven to be advantageous in which the upper cheek is vertically divided into two and the columns run straight from the joint to the lateral boundary of the upper cheek and are inclined downwards at a certain angle. Favorable conditions result when the angle of inclination of the gaps is selected as a function of the section modulus of the upper beam as a function of the length of the beam and corresponds at least approximately to half the mean gradient of this function. In a first approximation, this leads to a construction in which the upper cheek with a straight lower edge of the lower beam part has a total height which decreases from the middle of the cheek to the cheek ends, and in which the angle of inclination of the columns is approximately half the mean angle of inclination of the upper edge of the upper Part of the bar.

In der Zeichnung sind an einer Abkantpresse Ausführungsbeispiele der Erfindung dargestellt, und zwar zeigen:

Fig. 1
eine Frontansicht der Abkantpresse gemäss einer ersten Ausführungsform;
Fig. 2
eine Seitenansicht derselben;
Fig. 3
eine Ansicht eines Kopplungsgliedes in grösserem Massstab;
Fig. 4
eine Ansicht der beiden Wangen der Abkantpresse mit dem Verlauf der Durchbiegungslinien unter Belastung.
Fig. 5
eine Frontansicht der Abkantpresse gemäss einer zweiten Ausführungsform; und
Fig. 6
einen Querschnitt durch die Mittel zur gegenseitigen Führung der beiden Wangenteile.
Exemplary embodiments of the invention are shown in the drawing on a press brake, namely:
Fig. 1
a front view of the press brake according to a first embodiment;
Fig. 2
a side view of the same;
Fig. 3
a view of a coupling member on a larger scale;
Fig. 4
a view of the two cheeks of the press brake with the course of the deflection lines under load.
Fig. 5
a front view of the press brake according to a second embodiment; and
Fig. 6
a cross section through the means for mutual guidance of the two cheek parts.

Gemäss den Fig. 1 und 2 ist das Gestell der Abkantpresse im wesentlichen aus zwei vertikalen Seitenwangen 1 und einem die Seitenwangen 1 oberseitig miteinander verbindenden Jochbalken 2 aufgebaut. Der Jochbalken ist kastenförmig ausgebildet und besteht aus zwei vertikalen Längsplatten 3 und 4, welche endseitig durch je eine vertikale Querplatte 5 miteinander verbunden sind. Die Seitenwangen 1 sind aus je zwei hochstehenden Platten 6 und 7 gebildet, welche mit einem einen Zwischenraum 8 freilassenden Abstand voneinander angeordnet sind und oberseitig durch den Jochbalken 2 und unterseitig je durch einen Steg 9 miteinander verbunden sind. Die aktiven Teile der Abkantpresse bilden eine feststehende Unterwange 10 und eine Oberwange 11, an denen die Abkantwerkzeuge in nicht dargestellter Weise befestigbar sind.1 and 2, the frame of the press brake is essentially composed of two vertical side walls 1 and a yoke beam 2 connecting the side walls 1 to one another on the upper side. The yoke beam is box-shaped and consists of two vertical longitudinal plates 3 and 4, which are connected to one another at the ends by a vertical transverse plate 5. The side walls 1 are each formed from two upstanding plates 6 and 7, which are arranged at a distance from one another leaving a space 8 and are connected to one another at the top by the yoke beam 2 and at the bottom by a web 9. The active parts of the press brake form a fixed lower beam 10 and an upper beam 11, to which the bending tools can be fastened in a manner not shown.

An der Innenseite der beiden Seitenwangen 1 befinden sich je zwei Stützen 12, welche den Lagerbock für die als freiaufliegender Balken konzipierte Unterwange 10 bilden. Zu diesem Zweck sind die Stützen 12 je mit einer halbzylindrischen Pfanne 13 versehen. An beiden, jeweils zwischen die Stützen 12 reichenden, abgesetzten Enden der Unterwange 10 ist ein zylindrischer Zapfen 14 verankert, welcher mit seinen vorstehenden Enden in den betreffenden Pfannen 13 der Stützen 12 ruht.On the inside of the two side walls 1 there are two supports 12, which form the bearing block for the lower beam 10 designed as a free-standing beam. To this For the purpose, the supports 12 are each provided with a semi-cylindrical pan 13. A cylindrical pin 14 is anchored at both, stepped ends of the lower beam 10, which reach between the supports 12 and whose projecting ends rest in the relevant pans 13 of the supports 12.

Die Oberwange 10 ist in Kraftrichtung zweigeteilt, wobei der obere Wangenteil 15 und der untere, an die Arbeitsstelle 16 angrenzende Wangenteil 17 in der Wangenmitte aufeinanderstossen und beidseits der als Stossfläche 18 ausgebildeten Stossstelle durch je einen Spalt 19 mit bis zum Wangenende 20 hin zunehmender Spaltbreite voneinander getrennt sind. Der obere Wangenteil 15 der Oberwange 10 hängt an seinen beiden abgesetzten Enden je an zwei Tragorganen 21, welche einerseits mit dem oberen Wangenteil 15 und andererseits mit der Kolbenstange 22 eines Kraftzylinders 23 gelenkig verbunden sind, wobei die am Wangenteil 15 befindliche Gelenkachse mit 24 und die an der Kolbenstange 18 befindliche Gelenkachse mit 25 bezeichnet ist. Jeder Kraftzylinder 23 ist an der benachbarten Querplatte 5 des Jochbalkens 2 befestigt. Zur Übertragung der Presskraft von den Kolbenstangen 22 auf den oberen Wangenteil 15 der Oberwange 10 und zur punktuellen Krafteinleitung in diesen Wangenteil 15 ist je eine sphärische Stossverbindung 26 vorgesehen. Auf Einzelheiten dieser Stossverbindung wird hier nicht näher eingegangen.The upper cheek 10 is divided into two in the direction of the force, the upper cheek part 15 and the lower cheek part 17 adjoining the work station 16 abutting one another in the middle of the cheek and on both sides of the joint formed as the butt surface 18 by a gap 19 with a gap width increasing up to the cheek end 20 are separated. The upper cheek part 15 of the upper cheek 10 hangs on its two offset ends from each of two support members 21, which are articulated on the one hand to the upper cheek part 15 and on the other hand to the piston rod 22 of a power cylinder 23, the articulated axis located on the cheek part 15 with 24 and the on the piston rod 18 located hinge axis is designated 25. Each power cylinder 23 is attached to the adjacent cross plate 5 of the yoke beam 2. A spherical butt joint 26 is provided for transmitting the pressing force from the piston rods 22 to the upper cheek part 15 of the upper cheek 10 and for the selective introduction of force into this cheek part 15. The details of this butt connection are not discussed in more detail here.

Die beiden Wangenteile 15 und 17 der Oberwange 10 sind durch Kopplungsglieder 27 miteinander verbunden, welche nahe der Wangenenden 20 angeordnet sind und die beiden Wangenteile 15, 17 an der Stossfläche 18 lose zusammenhalten. Die gegenseitige Lage der beiden Wangenteile 15, 17 ist zudem durch einen im Bereich der Stossfläche 18 beidseits eingelassenen Passbolzen 28 gesichert. Die Kopplungsglieder 27 sind ähnlich ausgebildet wie die Tragorgane 21 und mit den Wangenteilen 15, 17 ebenfalls gelenkig verbunden, wobei die Gelenkachsen mit 29 und 30 bezeichnet sind.The two cheek parts 15 and 17 of the upper cheek 10 are connected to one another by coupling members 27, which are arranged near the cheek ends 20 and hold the two cheek parts 15, 17 loosely together on the abutment surface 18. The mutual position of the two cheek parts 15, 17 is also secured by a fitting bolt 28 inserted on both sides in the area of the abutting surface 18. The coupling members 27 are formed similarly to the support members 21 and also articulated to the cheek parts 15, 17, the articulation axes being designated 29 and 30.

Eine bevorzugte Ausführungsform der Kopplungsglieder 27 ist in Fig. 3 dargestellt. Gemäss dieser Ausführung ist das Kopplungsglied 27 in Kraftrichtung unterteilt in einen mit der Gelenkachse 29 verbundenen Oberteil 31 und einen mit der Gelenkachse 30 verbundenen Unterteil 32. Der Oberteil 31 und der Unterteil 32 sind durch Schrauben 33 miteinander verbunden, welche die seitwärts gerichteten Schenkel 35 des Oberteils 31 freilaufend durchsetzen und in den Unterteil 32 eingeschraubt sind. Zwischen den Schraubenköpfen 34 und den Schenkeln 35 des Oberteils 31 sind Federelemente 36, z.B. Tellerfedern, eingesetzt, welche so dimensioniert sind, dass sie im Leergang der Oberwange 10 das Gewicht des unteren Wangenteils 17 aufnehmen und die beiden Wangenteile 15, 17 lose zusammenhalten. Auf diese Weise wird erreicht, dass der untere Wangelteil 17 eine stabile Lage einnimmt, d.h. im Arbeitsgang der Oberwange 10 auf Biegung beansprucht wird und bei einseitiger Belastung nicht ohne Widerstand gegen den oberen Wangenteil 15 kippt.A preferred embodiment of the coupling members 27 is shown in FIG. 3. According to this embodiment, the coupling member 27 is divided in the direction of force into an upper part 31 connected to the articulated axis 29 and a lower part 32 connected to the articulated axis 30. The upper part 31 and the lower part 32 are connected to one another by screws 33 which secure the laterally directed legs 35 of the Push through the upper part 31 freely and are screwed into the lower part 32. Between the screw heads 34 and the legs 35 of the upper part 31, spring elements 36, for example plate springs, are used, which are dimensioned such that they absorb the weight of the lower cheek part 17 when the upper cheek 10 is empty and hold the two cheek parts 15, 17 loosely together. In this way it is achieved that the lower cheek part 17 assumes a stable position, that is to say it is subjected to bending in the operation of the upper cheek 10 and does not tip without resistance to the upper cheek part 15 in the case of one-sided loading.

In Fig. 4 sind für die beiden Wangen 10 und 11 der Abkantpresse die an der Arbeitsstelle 16 auftretenden Durchbiegungslinien 45 bzw. 46 im Falle einer gleichmässigen Belastung über die ganze Länge der Wangen eingezeichnet, wobei das Mass der Durchbiegung übermässig vergrössert dargestellt ist. Wie ersichtlich, biegen sich die beiden Wangen 10 und 11 unter dem Einfluss der Presskräfte Fp, der Auflagekräfte Fa und der Wangengewichte Go und Gu gleichsinnig durch, und die Durchbiegungslinien 45 und 46 verlaufen annähernd parallel.In Fig. 4 for the two cheeks 10 and 11 of the press brake the bending lines 45 and 46 occurring at the work station 16 are drawn in the case of a uniform load over the entire length of the cheeks, the extent of the deflection being shown in an enlarged manner. As can be seen, the two cheeks 10 and 11 bend in the same direction under the influence of the pressing forces F p , the contact forces F a and the cheek weights G o and G u , and the deflection lines 45 and 46 run approximately parallel.

Die Abkantpresse gemäss der zweiten Ausführungsform nach Fig. 5 unterscheidet sich von derjenigen nach den Fig. 1 und 2 im wesentlichen nur durch die Mittel für den Zusammenhalt der beiden Wangenteile 15 und 17 der Oberwange 10. Unter Wegfall der Kopplungsglieder 27 sind in diesem Ausführungsbeispiel die beiden Wangenteile 15 und 17 an der hier etwas breiteren Stossfläche fest miteinander verbunden, und zwar durch Schrauben 37, welche hier in beidseits der Wangenteile 15, 17 vorgesehenen Flanschen 38, 39 angeordnet sind. Unter Umständen können die Flanschen 38, 39 auch weggelassen und entsprechende Verbindungsschrauben innerhalb der Wangenteile 15, 17 angeordnet werden, wobei für die Zugänglichkeit der Schraubenköpfe entsprechende Ausnehmungen z.B. im oberen Wangenteil 15 vorzusehen wären.The press brake according to the second embodiment according to FIG. 5 differs from that according to FIGS. 1 and 2 essentially only by the means for holding the two cheek parts 15 and 17 of the upper cheek together. In this exemplary embodiment, the coupling members 27 are omitted the two cheek parts 15 and 17 are firmly connected to one another at the somewhat wider abutting surface, specifically by means of screws 37, which are arranged here in flanges 38, 39 provided on both sides of the cheek parts 15, 17. Under certain circumstances, the flanges 38, 39 can also be omitted and corresponding connecting screws can be arranged within the cheek parts 15, 17, with corresponding recesses, for example in the upper cheek part, for the accessibility of the screw heads 15 would have to be provided.

Ferner sind bei der Ausführungsform nach Fig. 5 im Bereich der Wangenenden 20 Vorrichtungen 40 zur gegenseitigen Führung der beiden Wangenteile 15, 17 vorgesehen. Jede dieser Vorrichtungen 40 besteht z.B. gemäss Fig. 6 aus zwei den Spalt 19 zwischen den beiden Wangenteilen 15, 17 überbrückenden Platten 41, welche am oberen Wangenteil 15 mit Schrauben 42 befestigt sind und an den Seiten des unteren Wangenteils 17 wirksame Führungskörper 43 tragen, wobei diese Führungskörper 43 durch Stellschrauben 44 achsial verstellbar sind.Furthermore, in the embodiment according to FIG. 5, devices 40 for mutually guiding the two cheek parts 15, 17 are provided in the region of the cheek ends. Each of these devices 40 is e.g. 6 from two plates 41 bridging the gap 19 between the two cheek parts 15, 17, which are fastened to the upper cheek part 15 with screws 42 and carry effective guide bodies 43 on the sides of the lower cheek part 17, these guide bodies 43 being set by adjusting screws 44 are axially adjustable.

Claims (16)

Presse mit wenigstens zwei parallelen Pressbalken (10, 11), welche an der Arbeitsstelle (16) längsseits einander gegenüberliegen und unter dem Einfluss von Presskräften (Fp) quer zu ihrer Längsausdehnung gegeneinander bewegbar sind, wobei die Presskräfte jeweils im Bereich der beiden Längsenden der Pressbalken (10, 11) punktuell angreifen, dadurch gekennzeichnet, dass wenigstens einer der beiden Pressbalken (10) zweigeteilt ist, wobei die Teilung quer zum Verlauf der Presskräfte (FP) verläuft, und wobei die beiden Balkenteile (15, 17) in der Balkenmitte an einer Stossstelle (18) aneinander anliegen und beidseits der Stossstelle (18) durch je einen Spalt (19) mit bis zum Balkenende (20) hin stetig zunehmender Spaltbreite voneinander getrennt sind, und dass sich die Kraftangriffspunkte des zweigeteilten Pressbalkens (10) an dem der Arbeitsstelle (16) abgewandten Balkenteil (15) befinden.Press with at least two parallel press beams (10, 11), which are opposite one another along the work site (16) and can be moved against one another transversely to their longitudinal extent under the influence of press forces (F p ), the press forces in each case in the region of the two longitudinal ends of the Attacking the press beam (10, 11) punctually, characterized in that at least one of the two press beams (10) is divided in two, the division being transverse to the course of the press forces (F P ), and the two beam parts (15, 17) in the Bearing the middle of the beam against each other at a joint (18) and separated from each other on both sides of the joint (18) by a gap (19) with a gap width that increases continuously up to the beam end (20), and that the force application points of the two-part press beam (10) come together the bar part (15) facing away from the work station (16). Presse nach Anspruch 1, dadurch gekennzeichnet, dass der Querschnittsverlauf der an die Arbeitsstelle (16) angrenzenden Pressbalken (11) bzw. Balkenteile (17) in Funktion der Balkenlänge derart gewählt und damit deren Widerstandsmomente in ihrer Funktion längs der Arbeitsstelle (16) derart aufeinander abgestimmt sind, dass die Durchbiegungslinien (45, 46) der beiden Pressbalken (10, 11) in deren Arbeitsbereich bei jedem Belastungszustand wenigstens annähernd parallel verlaufen.Press according to Claim 1, characterized in that the cross-sectional profile of the press bars (11) or bar parts (17) adjoining the work station (16) is a function of the Beam length selected in such a way that their resistance moments in their function along the work station (16) are coordinated with one another in such a way that the deflection lines (45, 46) of the two press beams (10, 11) run at least approximately parallel in their working area in every load condition. Presse nach Anspruch 1, dadurch gekennzeichnet, dass die Breite der Spalten (19) an den Balkenenden (20) im unbelasteten Zustand des geteilten Pressbalkens (10) grössenordnungsmässig der unter den gleichen Bedingungen am ungeteilten Pressbalken unter Last auftretenden maximalen Durchbiegung entspricht.Press according to claim 1, characterized in that the width of the gaps (19) at the beam ends (20) in the unloaded state of the divided press beam (10) corresponds in magnitude to the maximum deflection occurring under load under the same conditions on the undivided press beam. Presse nach Anspruch 3, dadurch gekennzeichnet, dass die Breite der Spalten (19) an den Balkenenden (20) mindestens so gross ist wie die bei maximaler Presskraft (Fp) auftretende maximale Durchbiegung eines dem geteilten Pressbalken (10) gegenüberliegenden ungeteilten Pressbalkens (11).Press according to claim 3, characterized in that the width of the gaps (19) at the beam ends (20) is at least as great as the maximum deflection of an undivided press beam (11) opposite the divided press beam (10) at maximum press force (F p ) ). Presse nach Anspruch 1, wobei beide Pressbalken zweigeteilt sind, dadurch gekennzeichnet, dass die Breite der Spalten an den Balkenenden höchstens so gross ist wie die unter den gleichen Bedingungen an ungeteilten Pressbalken auftretende maximale Durchbiegung.Press according to claim 1, wherein both press beams are divided into two, characterized in that the width of the gaps at the beam ends is at most as large as the maximum deflection occurring on the undivided press beams under the same conditions. Presse nach Anspruch 1, dadurch gekennzeichnet, dass die beiden Balkenteile (15, 17) des zweigeteilten Pressbalkens (10) durch Kopplungsglieder (27) miteinander verbunden sind.Press according to claim 1, characterized in that the two beam parts (15, 17) of the two-part press beam (10) are connected to one another by coupling members (27). Presse nach Anspruch 6, dadurch gekennzeichnet, dass die Kopplungsglieder (27) im Bereich der Balkenenden (20) angeordnet sind.Press according to claim 6, characterized in that the coupling members (27) are arranged in the region of the beam ends (20). Presse nach Anspruch 6 oder 7, dadurch gekennzeichnet, dass die Kopplungsglieder (27) mit beiden Balkenteilen (15, 17) gelenkig verbunden sind.Press according to claim 6 or 7, characterized in that the coupling members (27) are articulated to both beam parts (15, 17). Presse nach einem der Ansprüche 6 bis 8, dadurch gekennzeichnet, dass die Kopplungsglieder (27) einen beim Pressvorgang wirksamen Freilauf aufweisen.Press according to one of claims 6 to 8, characterized in that the coupling members (27) have a freewheel which is effective during the pressing process. Presse nach Anspruch 9, dadurch gekennzeichnet, dass die Kopplungsglieder (27) in den Kraftschluss derselben eingeschaltete Federelemente (36) enthalten.Press according to claim 9, characterized in that the coupling members (27) contain spring elements (36) which are switched into the force-locking connection thereof. Presse nach Anspruch 10, dadurch gekennzeichnet, dass die Federelemente (36) so dimensioniert sind, dass sie bei unbelastetem Pressbalken (10) dessen beide Balkenteile (15, 17) lose zusammenhalten.Press according to claim 10, characterized in that the spring elements (36) are dimensioned such that they hold the two beam parts (15, 17) loosely together when the press beam (10) is not loaded. Presse nach Anspruch 1, dadurch gekennzeichnet, dass die beiden Balkenteile (15, 17) des zweigeteilten Pressbalkens (10) an der Stossstelle (18) miteinander fest verbunden, z.B. verschraubt sind.Press according to claim 1, characterized in that the two beam parts (15, 17) of the two-part press beam (10) at the joint (18) firmly connected to each other, for example screwed. Presse nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass im Bereich der Balkenenden (20) des zweigeteilten Pressbalkens (10) Mittel (40) vorgesehen sind, welche die beiden Balkenteile (15, 17) gegenseitig führen.Press according to one of the preceding claims, characterized in that means (40) are provided in the region of the beam ends (20) of the two-part press beam (10), which guide the two beam parts (15, 17) to one another. Presse nach einem der vorhergehenden Ansprüche, mit übereinander angeordneten Pressbalken, welche durch eine vertikal beweglich Oberwange (10), an deren beiden Enden die Presskräfte (Fp) eingeleitet werden, und eine an den beiden Enden frei aufliegende Unterwange (11) gebildet sind, dadurch gekennzeichnet, dass die Oberwange (10) vertikal zweigeteilt ist und dass die Spalten (19) von der Stossstelle (18) bis zur seitlichen Begrenzung (20) der Oberwange (10) hin geradlinig verlaufen und in einem bestimmten Winkel nach unten geneigt sind.Press according to one of the preceding claims, with press bars arranged one above the other, which are formed by a vertically movable upper cheek (10), at the two ends of which the pressing forces (F p ) are introduced, and a lower cheek (11) lying freely at the two ends, characterized in that the upper cheek (10) is divided vertically in two and that the gaps (19) run straight from the joint (18) to the lateral boundary (20) of the upper cheek (10) and are inclined downwards at a certain angle. Presse nach Anspruch 14, dadurch gekennzeichnet, dass der Neigungswinkel der Spalten (19) in Abhängigkeit vom Widerstandsmoment der Oberwange (10) in Funktion der Wangenlänge gewählt ist und wenigstens annähernd der Hälfte der mittleren Steigung dieser Funktion entspricht.Press according to claim 14, characterized in that the angle of inclination of the gaps (19) is selected as a function of the section modulus of the upper cheek (10) as a function of the cheek length and corresponds at least approximately to half the mean slope of this function. Presse nach Anspruch 15, dadurch gekennzeichnet, dass die Oberwange (10) bei gerader Unterkante des unteren Balkenteils (17) eine Gesamthöhe hat, welche von der Wangenmitte zu den Wangenenden hin abnimmt, und dass der Neigungswinkel der Spalten (19) etwa der Hälfte des mittleren Neigungswinkels der Oberkante des oberen Balkenteils (15) beträgt.Press according to claim 15, characterized in that the upper cheek (10) with a straight lower edge of the lower beam part (17) has a total height which decreases from the center of the cheek to the cheek ends, and that the angle of inclination of the gaps (19) is approximately half the average angle of inclination of the upper edge of the upper beam part ( 15).
EP92810802A 1991-11-21 1992-10-20 Press Withdrawn EP0543772A1 (en)

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DE4138286 1991-11-21
DE4138286A DE4138286A1 (en) 1991-11-21 1991-11-21 PRESS

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EP (1) EP0543772A1 (en)
JP (1) JPH07100178B2 (en)
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DE (1) DE4138286A1 (en)

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WO2010042962A3 (en) * 2008-10-15 2010-06-10 Trumpf Maschinen Austria Gmbh & Co. Kg. Bending press having support bearing device for drive means
US8511132B2 (en) 2008-10-15 2013-08-20 Trumpf Maschinen Austria Gmbh & Co. Kg. Bending press having support bearing device for drive means
EP2210681A2 (en) 2009-01-27 2010-07-28 Trumpf Maschinen Austria GmbH & CO. KG. Bending press with a multi-part press bar
CN105934290A (en) * 2013-12-04 2016-09-07 特鲁普机械奥地利有限公司及两合公司 Bending press
CN105934290B (en) * 2013-12-04 2018-01-12 特鲁普机械奥地利有限公司及两合公司 Bullodozer

Also Published As

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US5293972A (en) 1994-03-15
JPH05208219A (en) 1993-08-20
JPH07100178B2 (en) 1995-11-01
DE4138286A1 (en) 1993-05-27
CN1073380A (en) 1993-06-23

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