EP3010709B1 - Method for warping the machine bed and/or the press ram of a punching press and punching press - Google Patents

Method for warping the machine bed and/or the press ram of a punching press and punching press Download PDF

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Publication number
EP3010709B1
EP3010709B1 EP13859602.8A EP13859602A EP3010709B1 EP 3010709 B1 EP3010709 B1 EP 3010709B1 EP 13859602 A EP13859602 A EP 13859602A EP 3010709 B1 EP3010709 B1 EP 3010709B1
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EP
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Prior art keywords
machine bed
press
warping
ram
press ram
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EP13859602.8A
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German (de)
French (fr)
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EP3010709A1 (en
Inventor
Josef Thomas Hafner
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Bruderer AG
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Bruderer AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/04—Frames; Guides
    • B30B15/042—Prestressed frames
    • 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
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/02—Stamping using rigid devices or tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/007—Means for maintaining the press table, the press platen or the press ram against tilting or deflection
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/34—Heating or cooling presses or parts thereof

Definitions

  • the present invention relates to a method for warping the machine bed and/or the press ram of a punch press to at least partially compensate for deflection caused by the punching force during punching operation, and a punch press, in particular for carrying out the method, according to the preambles of the independent claims.
  • the length of the tool installation space of stamping machines has practically doubled in the last three decades with the tonnage remaining the same, which leads to a corresponding increase in the moving and stationary masses due to the longer components and at the same time to problems with the rigidity of the press structure, since the The increase in length and the typically decreasing rigidity of some critical components, in particular the machine bed and the press ram, cannot be arbitrarily compensated for by corresponding cross-sectional enlargements due to limited space.
  • EP 0 653 254 A2 a press is known in which support units are arranged between the press bed and the platen, which are adjustable in height. These support units can be of a mechanical, electromechanical or hydraulic type and can be operated via a controller in such a way that deformation of the mold platen under the working pressure of the press is counteracted. It is also possible to use these support units to cause the clamping plate to bulge in order to compensate for mold peculiarities.
  • DE 20 36 911 A1 discloses a hot platen press for the manufacture of chipboard, fiberboard and the like, in which the structures supporting the hot plates can be kept flat by heat input and/or heat removal.
  • EP 0 355 730 A2 discloses a method for compensating for thermal deformations in components of machine tools by supplying or dissipating heat in certain areas of these components in order to keep these components as free as possible from temperature-related deformations.
  • the object is therefore to provide a technical solution which does not have the aforementioned disadvantages of the prior art or at least partially avoids them or at least represents an alternative to the existing systems.
  • a first aspect of the invention relates to a method for warping the machine bed and/or the press ram of a stamping press to at least partially compensate for a deflection of the machine bed or the press ram caused by the stamping force during the stamping operation.
  • a temperature gradient is generated in a targeted manner, as a result of which the machine bed warps in the direction of the press ram and/or the press ram warps in the direction of the press bed.
  • machine beds and press rams of stamping presses can be pre-deformed with very little outlay in terms of system technology for the purpose of at least partially compensating for deflections caused by the stamping force, without the need for existing ones and proven structural concepts must be deviated from. This is particularly important in the area of high-speed, high-performance stamping presses, since years of detailed work are often required to optimize the press structures in terms of their dynamic behavior and service life.
  • the method according to the invention can also be used with existing presses with little effort.
  • the temperature gradient causing the warping is generated by heating the machine bed in the area of its side facing the press ram or by heating the press ram in the area of its side facing the machine bed.
  • Local heating is a particularly simple and often economical method of generating a temperature gradient, especially since waste heat is often available free of charge in production plants.
  • the temperature gradient by cooling the machine bed in the area of its side facing away from the press ram or by cooling the press ram in the area of its side facing away from the machine bed. This method is particularly useful when these machine components become very warm during operation and can thus be locally cooled without falling below the dew point and causing condensation on the machine parts.
  • Heat and/or cold can be introduced into the components in a wide variety of ways.
  • a heated or cooled, gaseous or liquid medium flows through flow channels arranged within the machine bed or within the press ram.
  • heated lubricating oil of a lubricating oil circuit of the press can be used, which before re-cooling through the Flow channels is performed.
  • the latter procedure has the advantage that no additional energy is required for heating.
  • electrical heating elements are arranged within the machine bed or within the press ram and are supplied with electrical current in order to generate heat.
  • the temperature gradient is generated in that a clamping plate which is heated is arranged on the machine bed.
  • a clamping plate is arranged on the machine bed and a heating device, which is heated, is arranged between the machine bed and the clamping plate.
  • the side of the machine bed facing the ram is heated by means of the heated clamping plate or by means of the heating device arranged between the machine bed and the clamping plate, with the result that the machine bed warps in the direction of the press ram to come
  • the clamping plate is connected to the machine bed in a shear-resistant manner, directly or via the heating device.
  • the warping of the machine bed in the direction of the press ram can also occur exclusively as a result of the introduction of shear forces generated by thermal expansion of the platen into the side of the machine bed facing the ram, or also in combination with a heating of the machine bed by the clamping plate or the heating device.
  • stamping presses have an opening in the machine bed to carry away stamped parts and waste.
  • the temperature gradient within the machine bed is generated in such a way that the machine bed curves more strongly in the direction of the press ram in the area adjacent to the opening than in the areas adjacent to the longitudinal sides of the machine bed. This results in improved compensation for the deflection under the punching load, since the machine bed in such presses typically experiences greater deflection under the punching load in the area around the opening than in the area of its longitudinal sides.
  • the machine bed in the area of its side facing away from the press ram in the vicinity of the boundaries of the opening or to cool it more than in the vicinity of the longitudinal sides.
  • the curvature of the machine bed or the press ram is adjusted depending on parameters of the punching process, eg depending on a previously calculated or product-specific punching force or a maximum punching force measured during operation. Furthermore, it is preferred that the warping is adjusted during the intended operation of the press. In this way, the respective operating situation can be taken into account particularly well and any changes, e.g example due to increasing tool wear.
  • a second aspect of the invention relates to a stamping press which is suitable for carrying out the method according to the first aspect of the invention.
  • the stamping press has a machine bed and a press ram working against the machine bed.
  • the stamping press also includes means for warping the machine bed in the direction of the press ram and/or for warping the press ram in the direction of the machine bed by generating a temperature gradient within the machine bed or a support structure formed with the machine bed for the lower tool parts and/or within the press ram or a support structure formed with the press ram for the upper tool parts.
  • Flow channels are arranged within the machine bed or within the press ram, through which a heated or cooled, gaseous or liquid medium can flow during normal operation of the press in order to generate the temperature gradient.
  • the punching press also has a press control with which the warping of the machine bed or the press ram, preferably automatically, can be adjusted as a function of parameters of the stamping process, preferably as a function of a calculated or product-specific stamping force or a maximum stamping force measured during operation, specifically preferably during normal operation of the press. This enables process control with automatic adjustment of the curvature of the machine bed or the press ram to the respective operating conditions.
  • the means for warping the machine bed or the press ram are designed in such a way that they can be used to heat the machine bed in the area of its side facing the press ram or the press ram in the area of its side facing the machine bed, to effect warping due to uneven heating with a corresponding uneven spatial expansion of the same.
  • the means for warping the machine bed or the press ram are designed in such a way that they can be used to cool the machine bed in the region of its side facing away from the press ram or the press ram in the region of its side facing away from the machine bed, in order to bring about the warping due to a uneven cooling with corresponding uneven spatial shrinkage of the same.
  • electrical heating elements are arranged within the machine bed or within the press ram, in particular resistance heating elements, which can be supplied with electrical current during normal operation of the press to generate the temperature gradient causing the warping.
  • This design enables the temperature gradient to be generated in a particularly well controllable manner.
  • the punching press has, arranged on its machine bed, a clamping plate which can be heated, in particular electrically, during the intended operation of the press.
  • the stamping press has a platen arranged on its machine bed, with between the machine bed and a heating device, in particular an electric heating device, is arranged on the clamping plate, which can be operated during normal operation of the press.
  • the clamping plate or the heating device arranged between the clamping plate and the machine bed is connected to the machine bed in such a way that the clamping plate, when it is heated, or the heating device, when it is operated, the machine bed on its the side facing the ram is heated to generate the temperature gradient that causes the warping.
  • the clamping plate is connected to the machine bed in a shear-resistant manner, directly or via the heating device.
  • the heatable clamping plate or the heating device arranged between the clamping plate and the machine bed is essentially thermally decoupled from the machine bed, so that when the clamping plate is heated or when the heating device is operated, it essentially heats up and correspondingly expands the platen comes, whereby due to the shear-resistant coupling of the same to the machine bed, the warping of the machine bed in the direction of the press ram is effected.
  • the clamping plate is connected to the machine bed in such a way that, when it is heated, it heats the machine bed on its side facing the ram, or the heating device arranged between the clamping plate and the machine bed is connected to the clamping plate and the machine bed in such a way that, when it is operated, it heats up the platen and the machine bed on its side facing the ram heated.
  • This configuration causes the warping of the machine bed when the clamping plate is heated or when the heating device is operated by the shearing forces introduced into the machine bed by the clamping plate in combination with the uneven spatial expansion of the same resulting from the uneven heating of the machine bed.
  • the means for warping the machine bed to be designed in such a way that they compensate for the temperature gradients within the machine bed produce in such a way that the machine bed warps more in the area adjacent to the breakthrough than in the areas adjacent to its longitudinal sides. This results in improved compensation for the deflection under the punching load, since the machine bed in such presses under the punching load typically experiences greater deflection in the area around the opening than in the area of its longitudinal sides.
  • the means for arching the machine bed are designed in such a way that the machine bed can be heated with them in the area of its side facing the press ram near the boundaries of the opening or in these areas can be heated more than in the vicinity of the longitudinal sides.
  • the means for warping the machine bed are designed in such a way that the machine bed with them in the region of its side facing away from the press ram in the vicinity of the limits of the breakthrough can be cooled or can be cooled more in these areas than in the vicinity of the long sides.
  • the means for warping the machine bed or the press ram are advantageously adjustable, preferably during normal operation of the press, so that the warping of the machine bed or the press ram can be adjusted in a targeted manner and adapted to the respective operating case.
  • the clamping plate 4 is arranged on the machine bed 5 and has an opening 6a in the middle, which opens out in the direction of gravity into an opening 6b arranged centrally in the machine bed 5 .
  • the openings 6a, 6b are used to carry away punched parts and waste from the punching zone.
  • the machine bed 5 forms a closed cavity 7a, 7b on both sides of the opening 6b, which serves as a tank for the lubricating oil 8 of the lubricating oil circuit of the stamping machine.
  • the machine bed 5 is heated more in its lower area by the warm lubricating oil 8 than in its upper area, as a result of which it warps downwards due to different thermal expansion even without a punching force load. Under the load from the punching force, there is an additional deflection of the machine bed 5 during operation, and in resulting in a corresponding loss of precision and increased tool wear.
  • FIG 3 shows a section through the machine base of the stamping machine along the line XX in 1 , as formed according to a first embodiment of the invention.
  • the outer contours of the clamping plate 4 and the machine bed 5 are identical here to the embodiment according to FIG 2 .
  • the internal structure of the machine bed 5 differs significantly from that of FIG 2 .
  • the machine bed 5 forms two closed cavities 9a, 9b arranged one above the other on both sides of the opening 6b; 9c, 9d, of which only the upper ones 9a, 9c serve as a tank for the lubricating oil 8 of the lubricating oil circuit of the stamping machine.
  • the machine bed 5 has three flow channels 10a, 10b, 10c; 10d, 10e, 10f, of which the flow channels 10c, 10d closest to the opening 6b have a significantly larger flow cross section than the remaining flow channels 10a, 10b, 10e, 10f.
  • the flow channels 10a-10f are flowed through by the heated lubricating oil 8 of the lubricating oil circuit of the stamping machine, which is then fed into the cavities 9a, 9c, from where it is pumped again to the lubrication points of the Stamping machine is performed.
  • the warm lubricating oil 8 is first guided through the flow channels 10c, 10d closest to the opening 6b, then through the middle flow channels 10b, 10e and finally through the outer flow channels 10a, 10f, giving off heat to the machine bed 5.
  • the machine bed 5 is heated more during operation in its upper area than in its lower area, which causes it to expand as a result of different thermal expansion upwards and thus in the direction of the plunger 2 to warped.
  • the machine bed 5 is heated more in the areas adjacent to the opening 6b than in the areas of its long sides, which leads to greater warping of the same upwards in the areas adjacent to the opening 6b leads than in the areas of its long sides.
  • the clamping plate 4 which is attached to the machine bed 5 with a large number of screw connections, follows the warping of the machine bed 5. During operation, under the load from the punching force, this warping caused by thermal expansion is compensated for, so that the machine bed 5 ideally presses under maximum punching force load is flat in both the longitudinal and transverse direction, i.e. not warped or bent. This can effectively counteract a loss of punching precision and increased tool wear.
  • FIG 4 shows a section through the machine base of the stamping machine along the line XX in 1 , as formed according to a second embodiment of the invention.
  • the outer contours of the clamping plate 4 and the machine bed 5 are identical here to the embodiment according to FIG 2 , and also the internal structure of the machine bed 5 is identical to that of the machine bed 2 .
  • an intermediate plate 11 with a plurality of flow channels 10a-10l is arranged here between the clamping plate 4 and the machine bed 5, through which a hot water circuit flows during operation, for example from a recooling device of the lubricating oil circuit of the stamping machine.
  • the warm water first flows through the flow channels that are closest to the boundaries of the opening 6b in the machine bed 5 10d, 10e, 10h, 10i, then through the inner and middle flow channels 10c, 10f, 10g, 10j arranged next to these and finally through the outer flow channels 10a, 10b, 10k, 10l.
  • the intermediate plate 11 is heated by the hot water circuit and in turn heats the adjacent contact surfaces of the machine bed 5 and the clamping plate 4. As a result, the machine bed 5 is heated more in its upper area than in its lower area, which causes it to expand due to different thermal expansion above, ie in the direction of the plunger 2, warped.
  • the machine bed 5 warps upwards more in the areas adjacent to the opening 6b than in the areas of the longitudinal sides, which are heated to a lesser extent by the outer flow channels 10a, 10b, 10k, 101.
  • FIG 5 an automatic stamping machine according to the invention with an upper drive is shown, the lower part of the machine being cut with the drive 1 in the transverse direction is shown and the plunger 2 is shown partially in section.
  • the clamping plate 4 is not shown in section.
  • the ram 2 which is driven and guided by tension columns 3, has a plurality of longitudinal bores in the area of its underside, through which resistance heating elements 12 pass. Electric current is applied to these during operation, as a result of which the ram 2 is heated more in the area of its underside than in its upper area and consequently warps downwards, i.e. in the direction of the machine bed 5, as a result of different thermal expansion.
  • this warping caused by thermal expansion is compensated for, so that the ram 2 is straight under maximum punching force loading, i.e. not warped or bent. This can effectively counteract a loss of punching precision and increased tool wear.
  • FIG. 6 shows another punching machine according to the invention with a top drive, which differs from that in figure 5 shown differs only in that heating elements 12 are not arranged in the ram 2 itself, but in an intermediate plate 11, which is used to attach the upper tool parts to the ram 2.
  • the effect achieved in this way is identical to that described above, but this solution has the advantage that existing machines with a corresponding intermediate plate 11 can easily be converted into a stamping press according to the invention.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Presses And Accessory Devices Thereof (AREA)
  • Press Drives And Press Lines (AREA)

Description

Technisches Gebiettechnical field

Die vorliegende Erfindung betrifft ein Verfahren zum Verwölben des Maschinenbetts und/oder des Pressenstössels einer Stanzpresse zur zumindest teilweisen Kompensation einer stanzkraftbedingten Durchbiegung im Stanzbetrieb sowie eine Stanzpresse, insbesondere zur Durchführung des Verfahrens, gemäss den Oberbegriffen der unabhängigen Patentansprüche.The present invention relates to a method for warping the machine bed and/or the press ram of a punch press to at least partially compensate for deflection caused by the punching force during punching operation, and a punch press, in particular for carrying out the method, according to the preambles of the independent claims.

Stand der TechnikState of the art

Für die industrielle Herstellung von Stanzteilen aus Blechband kommen heute schnell laufende Stanzautomaten zum Einsatz, bei denen ein oberes Werkzeugteil mit Stempeln um einen bestimmten Hub auf ein unteres Werkzeugteil mit Matrizen zu bewegt wird und damit Schnitte und Formungen am Blechband ausführt. Die heutigen, so genannten Folgeschnittwerkzeuge, welche meist eine grössere Zahl von Modulen umfassen, die verschiedenste Aufgaben wie Schneiden, Biegen, Umformen und Prägen wahrnehmen, verlangen dabei nach immer längeren Werkzeugeinbauräumen.For the industrial production of stamped parts from sheet metal, high-speed automatic stamping machines are used today, in which an upper tool part with punches is moved by a certain stroke towards a lower tool part with dies and thus cuts and shapes the sheet metal strip. Today's so-called progressive dies, which usually include a large number of modules that perform a wide variety of tasks such as cutting, bending, forming and embossing, require ever longer tool installation spaces.

Entsprechend hat sich in den letzten drei Jahrzehnten die Länge des Werkzeugeinbauraumes von Stanzautomaten bei gleich bleibender Tonnage praktisch verdoppelt, was zu einem entsprechenden Anwachsen der bewegten und unbewegten Massen infolge der längeren Bauteile und gleichzeitig zu Problemen mit der Steifigkeit der Pressenstruktur führt, da die durch die Längenzunahme typischerweise abnehmende Steifigkeit einiger kritischer Bauteile, insbesondere des Maschinenbetts und des Pressenstössels, aufgrund beschränkter Platzverhältnisse nicht beliebig durch entsprechende Querschnittsvergrösserungen kompensiert werden kann.Accordingly, the length of the tool installation space of stamping machines has practically doubled in the last three decades with the tonnage remaining the same, which leads to a corresponding increase in the moving and stationary masses due to the longer components and at the same time to problems with the rigidity of the press structure, since the The increase in length and the typically decreasing rigidity of some critical components, in particular the machine bed and the press ram, cannot be arbitrarily compensated for by corresponding cross-sectional enlargements due to limited space.

Hierdurch wiederum ergibt sich das Problem, dass es mit zunehmender Länge des Werkzeugeinbauraumes immer schwieriger wird, die Verformungen der Pressenstruktur und insbesondere die Durchbiegung des Maschinenbetts unter der Stanzbelastung, welche für eine hohe Prozesspräzision und einen geringen Werkzeugverschleiss möglichst gering sein sollte, in vertretbaren Grenzen zu halten. Insbesondere für den Fall, dass Stanzarbeiten in der eher unüblichen Stanzrichtung von hinten nach vorne durchgeführt werden, stellen diese Durchbiegungen ein grosses Problem dar.This in turn leads to the problem that as the length of the tool installation space increases, it becomes more and more difficult to contain the deformations of the press structure and in particular the deflection of the machine bed under the punching load, which should be as low as possible for high process precision and low tool wear, within acceptable limits keep. This deflection poses a major problem, particularly when punching work is carried out in the rather unusual punching direction from back to front.

Um die Durchbiegung von Maschinenbetten bzw. Werkzeugaufspannplatten unter der Prozessbelastung zu verringern oder bestenfalls sogar zu kompensieren, ist es aus dem Stand der Technik bekannt, das Maschinenbett bzw. die Werkzeugaufspannplatte entgegen der Durchbiegungsrichtung zu verwölben, möglichst derart, dass diese Verwölbung durch die Prozessbelastung gerade aufgehoben wird, oder aber die Werkzeugaufspannplatte dynamisch mit höhenvariablen Stützelementen derart auf einer sich unter der Prozessbelastung allenfalls durchbiegenden Tragstruktur abzustützen, dass die Werkzeugaufspannplatte unter der Belastung keine wesentliche Durchbiegung erfährt.In order to reduce or even compensate for the deflection of machine beds or platens under the process load, it is known from the prior art to warp the machine bed or the platen against the direction of deflection, if possible in such a way that this warping is straightened out by the process load is lifted, or to dynamically support the mold platen with variable-height support elements on a support structure that may deflect under the process load in such a way that the mold platen does not experience any significant deflection under the load.

So ist aus EP 0 653 254 A2 eine Presse bekannt, bei welcher zwischen dem Pressenbett und der Werkzeugaufspannplatte Abstützeinheiten angeordnet sind, die in der Höhe einstellbar sind. Diese Abstützeinheiten können mechanischer, elektromechanischer oder hydraulischer Art sein und über eine Steuerung derartig betrieben werden, dass einer Verformung der Werkzeugaufspannplatte unter dem Arbeitsdruck der Presse entgegengewirkt wird. Auch ist es möglich, mit diesen Abstützeinheiten eine Vorwölbung der Aufspannplatte zu bewirken, um Werkzeugeigenarten zu kompensieren.That's it EP 0 653 254 A2 a press is known in which support units are arranged between the press bed and the platen, which are adjustable in height. These support units can be of a mechanical, electromechanical or hydraulic type and can be operated via a controller in such a way that deformation of the mold platen under the working pressure of the press is counteracted. It is also possible to use these support units to cause the clamping plate to bulge in order to compensate for mold peculiarities.

Aus DE 44 15 577 A1 ist ein Maschinentisch mit einer Werkzeugaufspannplatte für Pressen im Bereich der Umformtechnik bekannt, bei dem zwischen einer Grundplatte und der Werkzeugaufspannplatte eine Vielzahl hydraulischer Kompensationskolben angeordnet sind. Es sind Weg- bzw. Biegesensoren und eine geeignete Steuerung vorhanden, zum Regeln des Druckes in den Kompensationskolben derart, dass einer Verformung der Werkzeugaufspannplatte unter dem Arbeitsdruck der Presse entgegengewirkt wird.Out of DE 44 15 577 A1 is a machine table with a platen for presses in the field of forming technology is known, in which between a base plate and the mold platen, a plurality of hydraulic compensation pistons are arranged. Displacement or bending sensors and a suitable controller are available to regulate the pressure in the compensation pistons in such a way that deformation of the mold platen under the working pressure of the press is counteracted.

Die aus EP 0 653 254 A2 und DE 44 15 577 A1 bekannten Systeme weisen grundsätzlich den Nachteil auf, dass sie mechanisch komplex und damit aufwendig und kostenintensiv in der Herstellung und Wartung sind, und dass sie aufgrund der Bauweise mit mehrfacher punktueller Abstützung der Werkzeugaufspannplatte in Stanzkraftrichtung auf einer darunter liegenden Tragstruktur für die benötigte Bauhöhe eine relativ geringe strukturelle Steifigkeit ermöglichen. Für die Varianten mit hydraulischen Abstützeinheiten/Kompensationskolben kommt als weiterer Nachteil hinzu, dass das stützende Ölpolster in Stanzkraftrichtung eine geringe Steifigkeit aufweist und die unvermeidlichen Verformungen des gesamten Hydrauliksystems unter dem durch den Stützdruck erzeugten Öldruck zu einem Einfedern der Abstützung unter der Stanzbelastung führen. Für die Varianten, bei denen eine Durchbiegung der Werkzeugaufspannplatte mittels dynamischer Höhenverstellung von Stützelementen verhindert werden soll, ist zu sagen, dass sich diese, sofern zu vertretbaren Kosten realisierbar, allenfalls für sehr langsame Umformprozesse eignen, nicht aber für schnelle Stanzautomaten zur Verarbeitung von Blechbändern im Folgeschnittverfahren.From EP 0 653 254 A2 and DE 44 15 577 A1 Known systems basically have the disadvantage that they are mechanically complex and therefore expensive and costly to manufacture and maintain, and that they have a relatively low height due to the design with multiple punctiform support of the mold platen in the direction of the punching force on an underlying support structure provide structural rigidity. A further disadvantage for the variants with hydraulic support units/compensation pistons is that the supporting oil cushion has a low level of rigidity in the direction of the punching force and the unavoidable deformations of the entire hydraulic system under the oil pressure generated by the supporting pressure lead to a deflection of the support under the punching load. For the variants in which deflection of the mold platen is to be prevented by means of dynamic height adjustment of support elements, it can be said that these are suitable at best for very slow forming processes, provided they can be implemented at reasonable costs, but not for fast automatic punching machines for processing sheet metal strips in the progressive cutting process.

Aus DE 100 10 197 A1 ist eine Presse bekannt, bei welcher das Maschinenbett durch Vorspannen von im unteren Bereich das Maschinenbett in Längsrichtung durchsetzenden Zugankern in Richtung auf den Pressenstössel zu verwölbt werden kann, um eine Durchbiegung des Pressenbettes zu korrigieren oder um im lastfreien Zustand eine Vorwölbung zu erzeugen. Es ist eine Steuerung vorhanden, mittels welcher das Vorspannen der Zuganker in Abhängigkeit von ermittelten Durchbiegungen geregelt werden kann. Dieses letztgenannte System vermeidet weitestgehend die zuvor erwähnten Nachteile der zwei zuerst genannten Systeme, weist aber den Nachteil auf, dass das Maschinenbett speziell für diese Funktionsweise konstruiert werden muss, so dass von bestehenden und erprobten Strukturkonzepten abgewichen werden muss und eine Ausrüstung bestehender Pressen mit dem System kaum möglich ist.Out of DE 100 10 197 A1 a press is known in which the machine bed can be warped in the direction of the press ram by prestressing tie rods that pass through the machine bed in the longitudinal direction in the lower area, in order to correct a deflection of the press bed or to produce a bulge in the load-free state. There is a controller by means of which the prestressing of the tie rods can be controlled depending on the deflection determined. This latter system largely avoids the previously mentioned disadvantages of the two first-mentioned systems, but has the disadvantage that the machine bed has to be specially designed for this mode of operation, so that it is necessary to deviate from existing and tried-and-tested structural concepts and to equip existing presses with the system is hardly possible.

DE 20 36 911 A1 offenbart eine Heizplattenpresse für die Herstellung von Spanplatten, Faserplatten und dergleichen, bei welcher die Strukturen, welche die Heizplatten tragen, durch Wärmeeinbringung und/oder Wärmeabfuhr eben gehalten werden können. DE 20 36 911 A1 discloses a hot platen press for the manufacture of chipboard, fiberboard and the like, in which the structures supporting the hot plates can be kept flat by heat input and/or heat removal.

EP 0 355 730 A2 offenbart Verfahren zur Kompensation von Wärmedeformationen bei Bauteilen von Werkzeugmaschinen durch Zu- oder Abfuhr von Wärme in bestimmten Bereichen dieser Bauteile, um diese Bauteile möglichst frei von temperaturbedingten Verformungen zu halten. EP 0 355 730 A2 discloses a method for compensating for thermal deformations in components of machine tools by supplying or dissipating heat in certain areas of these components in order to keep these components as free as possible from temperature-related deformations.

Darstellung der ErfindungPresentation of the invention

Es stellt sich daher die Aufgabe, eine technische Lösung zur Verfügung zu stellen, welche die zuvor erwähnten Nachteile des Standes der Technik nicht aufweist bzw. diese zumindest teilweise vermeidet oder zumindest eine Alternative zu den bestehenden Systemen darstellt.The object is therefore to provide a technical solution which does not have the aforementioned disadvantages of the prior art or at least partially avoids them or at least represents an alternative to the existing systems.

Diese Aufgabe wird durch das Verfahren und die Stanzpresse gemäss den unabhängigen Patentansprüchen 1 und 13 gelöst.This object is achieved by the method and the stamping press according to independent patent claims 1 and 13.

Gemäss diesen betrifft ein erster Aspekt der Erfindung ein Verfahren zum Verwölben des Maschinenbetts und/oder des Pressenstössels einer Stanzpresse zur zumindest teilweisen Kompensation einer stanzkraftbedingten Durchbiegung des Maschinenbetts bzw. des Pressenstössels im Stanzbetrieb. Hierzu wird erfindungsgemäss innerhalb des Maschinenbetts bzw. einer mit dem Maschinenbett gebildeten Tragstruktur für die unteren Werkzeugteile und/- oder innerhalb des Pressenstössels bzw. einer mit dem Pressenstössel gebildeten Tragstruktur für die oberen Werkzeugteile gezielt ein Temperaturgradient erzeugt, durch den sich das Maschinenbett in Richtung auf den Pressenstössel zu und/oder der Pressenstössel in Richtung auf das Pressenbett zu verwölbt.According to this, a first aspect of the invention relates to a method for warping the machine bed and/or the press ram of a stamping press to at least partially compensate for a deflection of the machine bed or the press ram caused by the stamping force during the stamping operation. For this purpose, according to the invention, within the machine bed or a support structure formed with the machine bed for the lower tool parts and/or or within the press ram or a support structure formed with the press ram for the upper tool parts, a temperature gradient is generated in a targeted manner, as a result of which the machine bed warps in the direction of the press ram and/or the press ram warps in the direction of the press bed.

Durch das erfindungsgemässe Verfahren lassen sich Maschinenbetten und Pressenstössel von Stanzpressen mit einem sehr geringen anlagetechnischen Aufwand zwecks zumindest teilweiser Kompensation von stanzkraftbedingten Durchbiegungen vorverformen, ohne dass von bestehenden und erprobten Strukturkonzepten abgewichen werden muss. Dies ist insbesondere im Bereich der schnell laufenden Hochleistungsstanzautomaten von herausragender Bedeutung, da es hier oftmals jahrelanger Detailarbeit bedarf, um die Pressenstrukturen bezüglich ihres dynamischen Verhaltens und ihrer Lebensdauer zu optimieren. Zudem kann das erfindungsgemässe Verfahren mit wenig Aufwand auch bei bestehenden Pressen angewendet werden.With the method according to the invention, machine beds and press rams of stamping presses can be pre-deformed with very little outlay in terms of system technology for the purpose of at least partially compensating for deflections caused by the stamping force, without the need for existing ones and proven structural concepts must be deviated from. This is particularly important in the area of high-speed, high-performance stamping presses, since years of detailed work are often required to optimize the press structures in terms of their dynamic behavior and service life. In addition, the method according to the invention can also be used with existing presses with little effort.

In einer bevorzugten Ausführungsform des Verfahrens wird der die Verwölbung bewirkende Temperaturgradient durch Erwärmung des Maschinenbetts im Bereich seiner dem Pressenstössel zugewandten Seite bzw. durch Erwärmung des Pressenstössels im Bereich seiner dem Maschinenbett zugewandten Seite erzeugt. Das örtliche Erwärmen stellt eine besonders einfache und oftmals auch wirtschaftliche Methode zur Erzeugung eines Temperaturgradienten dar, zumal bei Produktionsanlagen oftmals Abwärme gratis zur Verfügung steht.In a preferred embodiment of the method, the temperature gradient causing the warping is generated by heating the machine bed in the area of its side facing the press ram or by heating the press ram in the area of its side facing the machine bed. Local heating is a particularly simple and often economical method of generating a temperature gradient, especially since waste heat is often available free of charge in production plants.

Alternativ oder ergänzend ist es bevorzugt, den Temperaturgradienten durch Kühlen des Maschinenbetts im Bereich seiner dem Pressenstössel abgewandten Seite bzw. durch Kühlen des Pressenstössels im Bereich seiner dem Maschinenbett abgewandten Seite zu erzeugen. Dieses Verfahren bietet sich insbesondere dann an, wenn diese Maschinenbauteile im Betrieb sehr warm werden und auf diese Weise örtlich gekühlt werden können, ohne dass es zu Taupunktunterschreitungen mit Kondenswasserausfall an den Maschinenteilen kommt.Alternatively or additionally, it is preferred to generate the temperature gradient by cooling the machine bed in the area of its side facing away from the press ram or by cooling the press ram in the area of its side facing away from the machine bed. This method is particularly useful when these machine components become very warm during operation and can thus be locally cooled without falling below the dew point and causing condensation on the machine parts.

Die Einbringung von Wärme und/oder Kälte in die Bauteile kann auf verschiedenste Weise erfolgen.Heat and/or cold can be introduced into the components in a wide variety of ways.

In einer bevorzugten Ausführungsform des Verfahrens werden hierzu innerhalb des Maschinenbetts bzw. innerhalb des Pressenstössels angeordnete Strömungskanäle mit einem erwärmten bzw. gekühlten, gasförmigen oder flüssigen Medium durchströmt. Hierzu kann beispielsweise erwärmtes Schmieröl eines Schmierölkreislaufs der Presse verwendet werden, welches vor dem Rückkühlen durch die Strömungskanäle geführt wird. Letztgenanntes Vorgehen hat den Vorteil, dass zur Erwärmung keine zusätzliche Energie benötigt wird.In a preferred embodiment of the method, a heated or cooled, gaseous or liquid medium flows through flow channels arranged within the machine bed or within the press ram. For this purpose, for example, heated lubricating oil of a lubricating oil circuit of the press can be used, which before re-cooling through the Flow channels is performed. The latter procedure has the advantage that no additional energy is required for heating.

In einer weiteren bevorzugten Ausführungsform des Verfahrens werden innerhalb des Maschinenbetts bzw. innerhalb des Pressenstössels elektrische Heizelemente angeordnet und mit elektrischem Strom beaufschlagt, zur Erzeugung von Wärme. Bei dieser Variante ergibt sich der Vorteil, dass mit sehr einfachen Mitteln eine präzise und auf den jeweiligen Betrieb angepasste Steuerung des Temperaturgradienten möglich ist.In a further preferred embodiment of the method, electrical heating elements are arranged within the machine bed or within the press ram and are supplied with electrical current in order to generate heat. This variant has the advantage that the temperature gradient can be controlled precisely and adapted to the respective operation with very simple means.

In noch einer weiteren bevorzugten Ausführungsform des Verfahrens wird der Temperaturgradient dadurch erzeugt, dass auf dem Maschinenbett eine Aufspannplatte angeordnet wird, welche beheizt wird.In yet another preferred embodiment of the method, the temperature gradient is generated in that a clamping plate which is heated is arranged on the machine bed.

In einer anderen bevorzugten Ausführungsform des Verfahrens wird auf dem Maschinenbett eine Aufspannplatte und zwischen dem Maschinenbett und der Aufspannplatte eine Heizeinrichtung angeordnet, welche beheizt wird.In another preferred embodiment of the method, a clamping plate is arranged on the machine bed and a heating device, which is heated, is arranged between the machine bed and the clamping plate.

Dabei wird gemäss einer bevorzugten Variante dieser beiden Ausführungsformen das Maschinenbett mittels der beheizten Aufspannplatte oder mittels der zwischen dem Maschinenbett und der Aufspannplatte angeordneten Heizeinrichtung auf seiner dem Stössel zugewandten Seite erwärmt, mit der Folge, dass es zu einer Verwölbung des Maschinenbetts in Richtung auf den Pressenstössel zu kommt.According to a preferred variant of these two embodiments, the side of the machine bed facing the ram is heated by means of the heated clamping plate or by means of the heating device arranged between the machine bed and the clamping plate, with the result that the machine bed warps in the direction of the press ram to come

Gemäss einer anderen bevorzugten Variante dieser beiden Ausführungsformen ist die Aufspannplatte schubsteif mit dem Maschinenbett verbunden, direkt oder über die Heizeinrichtung. Bei dieser Variante kann die Verwölbung des Maschinenbetts in Richtung auf den Pressenstössel zu auch ausschliesslich infolge einer Einleitung von durch eine Wärmedehnung der Aufspannplatte erzeugten Schubkräften in die dem Stössel zugewandte Seite des Maschinenbetts erfolgen, oder auch in Kombination mit einer Erwärmung des Maschinenbetts durch die Aufspannplatte bzw. die Heizeinrichtung.According to another preferred variant of these two embodiments, the clamping plate is connected to the machine bed in a shear-resistant manner, directly or via the heating device. In this variant, the warping of the machine bed in the direction of the press ram can also occur exclusively as a result of the introduction of shear forces generated by thermal expansion of the platen into the side of the machine bed facing the ram, or also in combination with a heating of the machine bed by the clamping plate or the heating device.

Viele Stanzpressen weisen einen Durchbruch im Maschinenbett zum Wegführen von Stanzteilen und Abfall auf. Bei solchen Pressen ist es bevorzugt, dass der Temperaturgradient innerhalb des Maschinenbetts derartig erzeugt wird, dass sich das Maschinenbett im Bereich angrenzend an den Durchbruch stärker in Richtung auf den Pressenstössel zu verwölbt als in den Bereichen angrenzend an die Längsseiten des Maschinenbetts. Hierdurch ergibt sich eine verbesserte Kompensation der Durchbiegung unter Stanzbelastung, da das Maschinenbett bei solchen Pressen im Bereich um den Durchbruch herum typischerweise eine grössere Durchbiegung unter der Stanzbelastung erfährt als im Bereich seiner Längsseiten.Many stamping presses have an opening in the machine bed to carry away stamped parts and waste. In such presses, it is preferred that the temperature gradient within the machine bed is generated in such a way that the machine bed curves more strongly in the direction of the press ram in the area adjacent to the opening than in the areas adjacent to the longitudinal sides of the machine bed. This results in improved compensation for the deflection under the punching load, since the machine bed in such presses typically experiences greater deflection under the punching load in the area around the opening than in the area of its longitudinal sides.

Um eine derartige Verwölbung zu erzeugen, ist es bevorzugt, das Maschinenbett im Bereich seiner dem Pressenstössel zugewandten Seite in der Nähe der Begrenzungen des Durchbruchs zu erwärmen bzw. stärker zu erwärmen als in der Nähe der Längsseiten.In order to produce such a warping, it is preferable to heat the machine bed in the area of its side facing the press ram in the vicinity of the boundaries of the opening or to heat it more than in the vicinity of the longitudinal sides.

Alternativ oder ergänzend ist es zur Erzielung einer solchen Verwölbung bevorzugt, das Maschinenbett im Bereich seiner dem Pressenstössel abgewandten Seite in der Nähe der Begrenzungen des Durchbruchs zu kühlen bzw. stärker zu kühlen als in der Nähe der Längsseiten.Alternatively or additionally, to achieve such a warping, it is preferred to cool the machine bed in the area of its side facing away from the press ram in the vicinity of the boundaries of the opening or to cool it more than in the vicinity of the longitudinal sides.

In noch einer weiteren bevorzugten Ausführungsform des Verfahrens ist es bevorzugt, dass die Verwölbung des Maschinenbetts bzw. des Pressenstössels in Abhängigkeit von Parametern des Stanzprozesses eingestellt wird, z.B. in Abhängigkeit von einer zuvor berechneten bzw. produktspezifischen Stanzkraft oder einer beim Betrieb gemessenen maximalen Stanzkraft. Weiter ist es bevorzugt, dass die Verwölbung während dem bestimmungsgemässen Betrieb der Presse eingestellt wird. Auf diese Weise kann der jeweiligen Betriebssituation besonders gut Rechnung getragen werden und etwaigen Veränderungen, zum Beispiel aufgrund von zunehmendem Werkzeugverschleiss, Rechnung getragen werden.In yet another preferred embodiment of the method, it is preferred that the curvature of the machine bed or the press ram is adjusted depending on parameters of the punching process, eg depending on a previously calculated or product-specific punching force or a maximum punching force measured during operation. Furthermore, it is preferred that the warping is adjusted during the intended operation of the press. In this way, the respective operating situation can be taken into account particularly well and any changes, e.g example due to increasing tool wear.

Ein zweiter Aspekt der Erfindung betrifft eine Stanzpresse, welche zur Durchführung des Verfahrens gemäss dem ersten Aspekt der Erfindung geeignet ist. Die Stanzpresse weist ein Maschinenbett und einen gegen das Maschinenbett arbeitenden Pressenstössel auf. Weiter umfasst die Stanzpresse Mittel zum Verwölben des Maschinenbetts in Richtung auf den Pressenstössel zu und/oder zum Verwölben des Pressenstössels in Richtung auf das Maschinenbett zu durch Erzeugung eines Temperaturgradienten innerhalb des Maschinenbetts bzw. einer mit dem Maschinenbett gebildeten Tragstruktur für die unteren Werkzeugteile und/oder innerhalb des Pressenstössels bzw. einer mit dem Pressenstössel gebildeten Tragstruktur für die oberen Werkzeugteile.A second aspect of the invention relates to a stamping press which is suitable for carrying out the method according to the first aspect of the invention. The stamping press has a machine bed and a press ram working against the machine bed. The stamping press also includes means for warping the machine bed in the direction of the press ram and/or for warping the press ram in the direction of the machine bed by generating a temperature gradient within the machine bed or a support structure formed with the machine bed for the lower tool parts and/or within the press ram or a support structure formed with the press ram for the upper tool parts.

Hierdurch wird es möglich, kostengünstig hochpräzise schnell laufende Hochleistungs-Stanzpressen mit Durchbiegungskompensation zur Verfügung zu stellen, ohne von erprobten Strukturkonzepten abzuweichen.This makes it possible to provide cost-effective, high-precision, fast-running, high-performance stamping presses with deflection compensation without deviating from tried-and-tested structural concepts.

Innerhalb des Maschinenbetts bzw. innerhalb des Pressenstössels sind Strömungskanäle angeordnet, welche im bestimmungsgemässen Betrieb der Presse mit einem erwärmten oder gekühlten, gasförmigen oder flüssigen Medium durchströmt werden können, zur Erzeugung des Temperaturgradienten.Flow channels are arranged within the machine bed or within the press ram, through which a heated or cooled, gaseous or liquid medium can flow during normal operation of the press in order to generate the temperature gradient.

Weiter sind Einrichtungen vorhanden, mit denen im bestimmungsgemässen Betrieb der Presse erwärmtes Schmieröl eines Schmierölkreislaufs der Presse durch die Strömungskanäle geführt werden kann, zur Erzeugung des Temperaturgradienten.Furthermore, there are devices with which, during normal operation of the press, heated lubricating oil of a lubricating oil circuit of the press can be guided through the flow channels in order to generate the temperature gradient.

Diese Lösung ist energetisch besonders vorteilhaft, da praktisch keine Heizenergie zur Bereitstellung der Wärme benötigt wird.This solution is particularly advantageous in terms of energy, since practically no heating energy is required to provide the heat.

Auch weist die Stanzpresse eine Pressensteuerung auf, mit welcher die Verwölbung des Maschinenbetts bzw. des Pressenstössels, bevorzugterweise automatisch, in Abhängigkeit von Parametern des Stanzprozesses einstellbar ist, bevorzugterweise in Abhängigkeit von einer berechneten bzw. produktspezifischen Stanzkraft oder eine im Betrieb gemessenen maximalen Stanzkraft, und zwar bevorzugterweise während dem bestimmungsgemässen Betrieb der Presse. Hierdurch wird eine Prozessführung mit automatischer Anpassung der Verwölbung des Maschinenbetts bzw. des Pressenstössels an die jeweiligen Betriebsbedingungen möglich.The punching press also has a press control with which the warping of the machine bed or the press ram, preferably automatically, can be adjusted as a function of parameters of the stamping process, preferably as a function of a calculated or product-specific stamping force or a maximum stamping force measured during operation, specifically preferably during normal operation of the press. This enables process control with automatic adjustment of the curvature of the machine bed or the press ram to the respective operating conditions.

In einer bevorzugten Ausführungsform der Stanzpresse sind die Mittel zum Verwölben des Maschinenbetts bzw. des Pressenstössels derartig ausgebildet, dass mit ihnen das Maschinenbett im Bereich seiner dem Pressenstössel zugewandten Seite bzw. der Pressenstössels im Bereich seiner dem Maschinenbett zugewandten Seite erwärmt werden kann, zur Bewirkung der Verwölbung aufgrund einer ungleichmässigen Erwärmung mit entsprechender ungleichmässiger räumlicher Ausdehnung derselben.In a preferred embodiment of the stamping press, the means for warping the machine bed or the press ram are designed in such a way that they can be used to heat the machine bed in the area of its side facing the press ram or the press ram in the area of its side facing the machine bed, to effect warping due to uneven heating with a corresponding uneven spatial expansion of the same.

Alternativ oder ergänzend sind die Mittel zum Verwölben des Maschinenbetts bzw. des Pressenstössels derartig ausgebildet, dass mit ihnen das Maschinenbett im Bereich seiner dem Pressenstössel abgewandten Seite bzw. der Pressenstössel im Bereich seiner dem Maschinenbett abgewandten Seite gekühlt werden kann, zur Bewirkung der Verwölbung aufgrund einer ungleichmässigen Abkühlung mit entsprechender ungleichmässiger räumlicher Schrumpfung derselben.Alternatively or additionally, the means for warping the machine bed or the press ram are designed in such a way that they can be used to cool the machine bed in the region of its side facing away from the press ram or the press ram in the region of its side facing away from the machine bed, in order to bring about the warping due to a uneven cooling with corresponding uneven spatial shrinkage of the same.

In einer weiteren bevorzugten Ausführungsform der Stanzpresse sind innerhalb des Maschinenbetts bzw. innerhalb des Pressenstössels elektrische Heizelemente angeordnet, insbesondere Widerstandsheizelemente, welche im bestimmungsgemässen Betrieb der Presse mit elektrischem Strom versorgt werden können, zur Erzeugung des die Verwölbung bewirkenden Temperaturgradienten. Diese Bauweise ermöglicht eine besonders gut kontrollierbare Erzeugung des Temperaturgradienten.In a further preferred embodiment of the stamping press, electrical heating elements are arranged within the machine bed or within the press ram, in particular resistance heating elements, which can be supplied with electrical current during normal operation of the press to generate the temperature gradient causing the warping. This design enables the temperature gradient to be generated in a particularly well controllable manner.

In noch einer weiteren bevorzugten Ausführungsform weist die Stanzpresse angeordnet auf ihrem Maschinenbett eine Aufspannplatte auf, welche während dem bestimmungsgemässen Betrieb der Presse, insbesondere elektrisch, beheizbar ist.In yet another preferred embodiment, the punching press has, arranged on its machine bed, a clamping plate which can be heated, in particular electrically, during the intended operation of the press.

In einer anderen bevorzugten Ausführungsform weist die Stanzpresse eine auf ihrem Maschinenbett angeordnete Aufspannplatte auf, wobei zwischen dem Maschinenbett und der Aufspannplatte eine insbesondere elektrische Heizeinrichtung angeordnet ist, welche während dem bestimmungsgemässen Betrieb der Presse betrieben werden kann.In another preferred embodiment, the stamping press has a platen arranged on its machine bed, with between the machine bed and a heating device, in particular an electric heating device, is arranged on the clamping plate, which can be operated during normal operation of the press.

Dabei ist gemäss einer bevorzugten Variante dieser beiden Ausführungsformen die Aufspannplatte bzw. die zwischen Aufspannplatte und Maschinenbett angeordnete Heizeinrichtung derartig mit dem Maschinenbett verbunden, dass die Aufspannplatte, wenn sie beheizt wird, bzw. dass die Heizeinrichtung, wenn sie betrieben wird, das Maschinenbett auf seiner dem Stössel zugewandten Seite erwärmt, zur Erzeugung des die Verwölbung bewirkenden Temperaturgradienten.According to a preferred variant of these two embodiments, the clamping plate or the heating device arranged between the clamping plate and the machine bed is connected to the machine bed in such a way that the clamping plate, when it is heated, or the heating device, when it is operated, the machine bed on its the side facing the ram is heated to generate the temperature gradient that causes the warping.

Gemäss einer anderen bevorzugten Variante dieser beiden Ausführungsformen ist die Aufspannplatte schubsteif mit dem Maschinenbett verbunden, direkt oder über die Heizeinrichtung.According to another preferred variant of these two embodiments, the clamping plate is connected to the machine bed in a shear-resistant manner, directly or via the heating device.

Dabei ist gemäss einer ersten bevorzugten Subvariante die beheizbare Aufspannplatte bzw. die zwischen der Aufspannplatte und dem Maschinenbett angeordnete Heizeinrichtung thermisch im Wesentlichen von dem Maschinenbett entkoppelt, so dass es beim Beheizen der Aufspannplatte bzw. beim Betreiben der Heizeinrichtung im Wesentlichen zu einem Aufheizen und entsprechenden Ausdehnen der Aufspannplatte kommt, wodurch infolge der schubsteifen Ankopplung derselben an das Maschinenbett die Verwölbung des Maschinenbetts in Richtung auf den Pressenstössel zu bewirkt wird.According to a first preferred sub-variant, the heatable clamping plate or the heating device arranged between the clamping plate and the machine bed is essentially thermally decoupled from the machine bed, so that when the clamping plate is heated or when the heating device is operated, it essentially heats up and correspondingly expands the platen comes, whereby due to the shear-resistant coupling of the same to the machine bed, the warping of the machine bed in the direction of the press ram is effected.

Gemäss einer zweiten bevorzugten Subvariante ist die Aufspannplatte derartig mit dem Maschinenbett verbunden, dass sie, wenn sie beheizt wird, das Maschinenbett auf seiner dem Stössel zugewandten Seite erwärmt, bzw. ist die zwischen Aufspannplatte und Maschinenbett angeordnete Heizeinrichtung derartig mit der Aufspannplatte und dem Maschinenbett verbunden, dass sie, wenn sie betrieben wird, die Aufspannplatte aufheizt und das Maschinenbett auf seiner dem Stössel zugewandten Seite erwärmt. Durch diese Ausgestaltung wird beim Beheizen der Aufspannplatte bzw. beim Betreiben der Heizeinrichtung die Verwölbung des Maschinenbetts durch die von der Aufspannplatte in das Maschinenbett eingeleiteten Schubkräfte in Kombination mit der durch die ungleichmässige Erwärmung des Maschinenbetts resultierende ungleichmässige räumlicher Ausdehnung derselben bewirkt.According to a second preferred sub-variant, the clamping plate is connected to the machine bed in such a way that, when it is heated, it heats the machine bed on its side facing the ram, or the heating device arranged between the clamping plate and the machine bed is connected to the clamping plate and the machine bed in such a way that, when it is operated, it heats up the platen and the machine bed on its side facing the ram heated. This configuration causes the warping of the machine bed when the clamping plate is heated or when the heating device is operated by the shearing forces introduced into the machine bed by the clamping plate in combination with the uneven spatial expansion of the same resulting from the uneven heating of the machine bed.

Die Verwendung von beheizbaren Aufspannplatten oder von zwischen dem Maschinenbett und einer Aufspannplatte angeordneter Heizeinrichtungen eignet sich besonders gut für die kostengünstige Nachrüstung bestehender Stanzpressen.The use of heatable clamping plates or heating devices arranged between the machine bed and a clamping plate is particularly well suited for the cost-effective retrofitting of existing stamping presses.

Weist das Maschinenbett der Stanzpresse einen Durchbruch auf zum Wegführen von Stanzteilen und Abfall, was bei den meisten schnell laufenden Stanzpressen der Fall ist, so ist es von Vorteil, dass die Mittel zum Verwölben des Maschinenbetts derartig ausgebildet sind, dass sie den Temperaturgradienten innerhalb des Maschinenbetts derartig erzeugen, dass sich das Maschinenbett im Bereich angrenzend an den Durchbruch stärker verwölbt als in den Bereichen angrenzend an seine Längsseiten. Hierdurch ergibt sich eine verbesserte Kompensation der Durchbiegung unter Stanzbelastung, da das Maschinenbett bei solchen Pressen unter Stanzbelastung im Bereich um den Durchbruch herum typischerweise eine grössere Durchbiegung erfährt als im Bereich seiner Längsseiten.If the machine bed of the stamping press has an opening for removing stamped parts and waste, which is the case with most high-speed stamping presses, it is advantageous for the means for warping the machine bed to be designed in such a way that they compensate for the temperature gradients within the machine bed produce in such a way that the machine bed warps more in the area adjacent to the breakthrough than in the areas adjacent to its longitudinal sides. This results in improved compensation for the deflection under the punching load, since the machine bed in such presses under the punching load typically experiences greater deflection in the area around the opening than in the area of its longitudinal sides.

Bevorzugterweise sind die Mittel zum Verwölben des Maschinenbetts hierzu derartig ausgebildet, dass das Maschinenbett mit ihnen im Bereich seiner dem Pressenstössel zugewandten Seite in der Nähe der Begrenzungen des Durchbruchs erwärmt werden kann bzw. in diesen Bereichen stärker erwärmt werden kann als in der Nähe der Längsseiten.Preferably, the means for arching the machine bed are designed in such a way that the machine bed can be heated with them in the area of its side facing the press ram near the boundaries of the opening or in these areas can be heated more than in the vicinity of the longitudinal sides.

Alternativ oder ergänzend sind die Mittel zum Verwölben des Maschinenbetts hierzu derartig ausgebildet, dass das Maschinenbett mit ihnen im Bereich seiner dem Pressenstössel abgewandten Seite in der Nähe der Begrenzungen des Durchbruchs gekühlt werden kann bzw. in diesen Bereichen stärker gekühlt werden kann als in der Nähe der Längsseiten.Alternatively or additionally, the means for warping the machine bed are designed in such a way that the machine bed with them in the region of its side facing away from the press ram in the vicinity of the limits of the breakthrough can be cooled or can be cooled more in these areas than in the vicinity of the long sides.

Mit Vorteil sind die Mittel zum Verwölben des Maschinenbetts bzw. des Pressenstössels einstellbar, und zwar bevorzugterweise während dem bestimmungsgemässen Betrieb der Presse, so dass eine gezielte und auf den jeweiligen Betriebsfall angepasste Einstellung der Verwölbung des Maschinenbetts bzw. des Pressenstössels möglich ist.The means for warping the machine bed or the press ram are advantageously adjustable, preferably during normal operation of the press, so that the warping of the machine bed or the press ram can be adjusted in a targeted manner and adapted to the respective operating case.

Kurze Beschreibung der ZeichnungenBrief description of the drawings

Weitere bevorzugte Ausführungen der Erfindung ergeben sich aus den abhängigen Ansprüchen und aus der nun folgenden Beschreibung anhand der Figuren. Dabei zeigen:

  • Fig. 1 eine Schnittdarstellung durch einen Stanzautomaten mit Oberantrieb;
  • Fig. 2 einen Schnitt durch das Maschinenunterteil des Stanzautomaten entlang der Linie X-X in Fig. 1;
  • Fig. 3 eine Darstellung wie Fig. 2 durch die Unterstruktur eines ersten erfindungsgemässen Stanzautomaten;
  • Fig. 4 eine Darstellung wie Fig. 2 durch die Unterstruktur eines zweiten erfindungsgemässen Stanzautomaten;
  • Fig. 5 eine Schnittdarstellung durch einen erfindungsgemässen Stanzautomaten mit Unterantrieb; und
  • Fig. 6 eine Schnittdarstellung durch einen weiteren erfindungsgemässen Stanzautomaten mit Unterantrieb.
Further preferred embodiments of the invention result from the dependent claims and from the following description based on the figures. show:
  • 1 a sectional view through a stamping machine with top drive;
  • 2 a section through the machine base of the stamping machine along the line XX in 1 ;
  • 3 a representation like 2 by the substructure of a first punching machine according to the invention;
  • 4 a representation like 2 by the substructure of a second punching machine according to the invention;
  • figure 5 a sectional view through an inventive punching machine with a bottom drive; and
  • 6 a sectional view through a further punching machine according to the invention with a bottom drive.

Wege zur Ausführung der ErfindungWays to carry out the invention

In Fig. 1 ist ein Stanzautomat mit Oberantrieb dargestellt, wobei das Maschinenoberteil mit dem Antrieb 1, dem Stössel 2 und den Stösselführungen 3 in Längsrichtung geschnitten dargestellt ist, während das Maschinenunterteil mit der Aufspannplatte 4 und dem Maschinenbett 5 nicht geschnitten dargestellt ist.In 1 an automatic stamping machine with top drive is shown, with the upper machine part with the drive 1, the ram 2 and the ram guides 3 being shown in section in the longitudinal direction, while the lower part of the machine with the clamping plate 4 and the machine bed 5 is not shown in section.

Fig. 2 zeigt einen Schnitt durch das Maschinenunterteil des Stanzautomaten entlang der Linie X-X in Fig. 1, wie es gemäss dem Stand der Technik ausgebildet ist. Wie zu erkennen ist, ist die Aufspannplatte 4 auf dem Maschinenbett 5 angeordnet und weist mittig einen Durchbruch 6a auf, welcher in Schwerkraftrichtung in einen mittig im Maschinenbett 5 angeordneten Durchbruch 6b einmündet. Die Durchbrüche 6a, 6b dienen dem Wegführen von Stanzteilen und Abfall aus der Stanzzone. 2 shows a section through the machine base of the stamping machine along the line XX in 1 , as it is designed according to the prior art. As can be seen, the clamping plate 4 is arranged on the machine bed 5 and has an opening 6a in the middle, which opens out in the direction of gravity into an opening 6b arranged centrally in the machine bed 5 . The openings 6a, 6b are used to carry away punched parts and waste from the punching zone.

Wie weiter zu erkennen ist, bildet das Maschinenbett 5 zu beiden Seiten des Durchbruchs 6b jeweils einen geschlossenen Hohlraum 7a, 7b aus, welcher als Tank für das Schmieröl 8 des Schmierölkreislaufs des Stanzautomaten dient. Im Betrieb wird das Maschinenbett 5 durch das warme Schmieröl 8 in seinem unteren Bereich stärker erwärmt als in seinem oberen Bereich, wodurch es sich bereits ohne Stanzkraftbelastung durch unterschiedliche Wärmedehnung nach unten hin verwölbt. Unter der Belastung durch die Stanzkraft kommt es im Betrieb zu einer zusätzlichen Durchbiegung des Maschinenbetts 5, und in der Folge zu einem entsprechenden Verlust an Präzision und einem erhöhten Werkzeugverschleiss.As can also be seen, the machine bed 5 forms a closed cavity 7a, 7b on both sides of the opening 6b, which serves as a tank for the lubricating oil 8 of the lubricating oil circuit of the stamping machine. During operation, the machine bed 5 is heated more in its lower area by the warm lubricating oil 8 than in its upper area, as a result of which it warps downwards due to different thermal expansion even without a punching force load. Under the load from the punching force, there is an additional deflection of the machine bed 5 during operation, and in resulting in a corresponding loss of precision and increased tool wear.

Fig. 3 zeigt einen Schnitt durch das Maschinenunterteil des Stanzautomaten entlang der Linie X-X in Fig. 1, wie es gemäss einer ersten Ausführungsform der Erfindung ausgebildet ist. Wie zu erkennen ist, sind die äusseren Konturen der Aufspannplatte 4 und des Maschinenbetts 5 hier identisch wie bei der Ausführung gemäss Fig. 2. Jedoch unterscheidet sich der innere Aufbau des Maschinenbetts 5 deutlich von demjenigen aus Fig. 2. Im vorliegenden Fall bildet das Maschinenbett 5 zu beiden Seiten des Durchbruchs 6b jeweils zwei übereinander angeordnete geschlossene Hohlräume 9a, 9b; 9c, 9d aus, von denen jeweils nur die oberen 9a, 9c als Tank für das Schmieröl 8 des Schmierölkreislaufs des Stanzautomaten dienen. Oberhalb der Hohlräume 9a, 9b; 9c, 9d weist das Maschinenbett 5 zu beiden Seiten des Durchbruchs 6b jeweils drei nebeneinander angeordnete Strömungskanäle 10a, 10b, 10c; 10d, 10e, 10f auf, von denen jeweils die dem Durchbruch 6b am nächsten liegenden Strömungskanäle 10c, 10d einen deutlich grösseren Strömungsquerschnitt aufweisen als die übrigen Strömungskanäle 10a, 10b, 10e, 10f. Die Strömungskanäle 10a-10f werden im Betrieb vom erwärmten Schmieröl 8 des Schmierölkreislaufs des Stanzautomaten durchströmt, welches anschliessend in die Hohlräume 9a, 9c geleitet wird, von wo es mit der Schmierölpumpe des Schmierölkreislaufs, gegebenenfalls nach vorherigem Durchlaufen eines Kühlers, erneut zu den Schmierstellen des Stanzautomaten geführt wird. Dabei wird das warme Schmieröl 8 zuerst durch die dem Durchbruch 6b am nächsten liegenden Strömungskanäle 10c, 10d geführt, sodann durch die mittleren Strömungskanäle 10b, 10e und zum Schluss durch die äusseren Strömungskanäle 10a, 10f, wobei es Wärme an das Maschinenbett 5 abgibt. Hierdurch wird das Maschinenbett 5 im Betrieb in seinem oberen Bereich stärker erwärmt als in seinem unteren Bereich, wodurch es sich in Folge unterschiedlicher Wärmedehnung nach oben und damit in Richtung auf den Stössel 2 zu verwölbt. 3 shows a section through the machine base of the stamping machine along the line XX in 1 , as formed according to a first embodiment of the invention. As can be seen, the outer contours of the clamping plate 4 and the machine bed 5 are identical here to the embodiment according to FIG 2 . However, the internal structure of the machine bed 5 differs significantly from that of FIG 2 . In the present case, the machine bed 5 forms two closed cavities 9a, 9b arranged one above the other on both sides of the opening 6b; 9c, 9d, of which only the upper ones 9a, 9c serve as a tank for the lubricating oil 8 of the lubricating oil circuit of the stamping machine. Above the cavities 9a, 9b; 9c, 9d, the machine bed 5 has three flow channels 10a, 10b, 10c; 10d, 10e, 10f, of which the flow channels 10c, 10d closest to the opening 6b have a significantly larger flow cross section than the remaining flow channels 10a, 10b, 10e, 10f. During operation, the flow channels 10a-10f are flowed through by the heated lubricating oil 8 of the lubricating oil circuit of the stamping machine, which is then fed into the cavities 9a, 9c, from where it is pumped again to the lubrication points of the Stamping machine is performed. The warm lubricating oil 8 is first guided through the flow channels 10c, 10d closest to the opening 6b, then through the middle flow channels 10b, 10e and finally through the outer flow channels 10a, 10f, giving off heat to the machine bed 5. As a result, the machine bed 5 is heated more during operation in its upper area than in its lower area, which causes it to expand as a result of different thermal expansion upwards and thus in the direction of the plunger 2 to warped.

Dabei wird das Maschinenbett 5 infolge der Reihenfolge der Durchströmung der Strömungskanäle und der unterschiedlichen Strömungskanalquerschnitte in den Bereichen angrenzend an den Durchbruch 6b stärker erwärmt als in den Bereichen seiner Längsseiten, was zu einer stärkeren Verwölbung desselben nach oben hin in den Bereichen angrenzend an den Durchbruch 6b führt als in den Bereichen seiner Längsseiten.Due to the order in which the flow passes through the flow channels and the different flow channel cross-sections, the machine bed 5 is heated more in the areas adjacent to the opening 6b than in the areas of its long sides, which leads to greater warping of the same upwards in the areas adjacent to the opening 6b leads than in the areas of its long sides.

Die Aufspannplatte 4, welche mit einer Vielzahl von Verschraubungen auf dem Maschinenbett 5 befestigt ist, folgt der Verwölbung des Maschinenbetts 5. Im Betrieb kommt es unter der Belastung durch die Stanzkraft zu einer Kompensation dieser wärmedehnungsbedingten Verwölbung, so dass das Maschinenbett 5 im Idealfall unter maximaler Stanzkraftbelastung sowohl in Längs- als auch in Querrichtung eben, d.h. nicht verwölbt bzw. nicht durchgebogen, ist. Hierdurch kann einem Verlust an Stanzpräzision und einem erhöhten Werkzeugverschleiss wirkungsvoll entgegengewirkt werden.The clamping plate 4, which is attached to the machine bed 5 with a large number of screw connections, follows the warping of the machine bed 5. During operation, under the load from the punching force, this warping caused by thermal expansion is compensated for, so that the machine bed 5 ideally presses under maximum punching force load is flat in both the longitudinal and transverse direction, i.e. not warped or bent. This can effectively counteract a loss of punching precision and increased tool wear.

Fig. 4 zeigt einen Schnitt durch das Maschinenunterteil des Stanzautomaten entlang der Linie X-X in Fig. 1, wie es gemäss einer zweiten Ausführungsform der Erfindung ausgebildet ist. Wie zu erkennen ist, sind hier die äusseren Konturen der Aufspannplatte 4 und des Maschinenbetts 5 identisch wie bei der Ausführung gemäss Fig. 2, und auch der innere Aufbau des Maschinenbetts 5 ist identisch mit demjenigen des Maschinenbetts aus Fig. 2. Jedoch ist hier zwischen der Aufspannplatte 4 und dem Maschinenbett 5 eine Zwischenplatte 11 mit einer Vielzahl von Strömungskanälen 10a-10l angeordnet, welche im Betrieb von einem Warmwasser-Kreislauf durchströmt werden, z.B. von einer Rückkühleinrichtung des Schmierölkreislaufs des Stanzautomaten. Dabei wird das warme Wasser zuerst durch die den Begrenzungen des Durchbruchs 6b im Maschinenbett 5 am nächsten liegenden Strömungskanäle 10d, 10e, 10h, 10i geführt, sodann durch die neben diesen angeordneten inneren und mittleren Strömungskanäle 10c, 10f, 10g, 10j und zum Schluss durch die äusseren Strömungskanäle 10a, 10b, 10k, 10l. Dabei wird die Zwischenplatte 11 durch den Warmwasserkreislauf beheizt und erwärmt ihrerseits die an sie angrenzenden Kontaktflächen des Maschinenbetts 5 und der Aufspannplatte 4. Hierdurch wiederum wird das Maschinenbett 5 in seinem oberen Bereich stärker erwärmt als in seinem unteren Bereich, wodurch es sich infolge unterschiedlicher Wärmedehnung nach oben, d.h. in Richtung auf den Stössel 2 zu, verwölbt. 4 shows a section through the machine base of the stamping machine along the line XX in 1 , as formed according to a second embodiment of the invention. As can be seen, the outer contours of the clamping plate 4 and the machine bed 5 are identical here to the embodiment according to FIG 2 , and also the internal structure of the machine bed 5 is identical to that of the machine bed 2 . However, an intermediate plate 11 with a plurality of flow channels 10a-10l is arranged here between the clamping plate 4 and the machine bed 5, through which a hot water circuit flows during operation, for example from a recooling device of the lubricating oil circuit of the stamping machine. The warm water first flows through the flow channels that are closest to the boundaries of the opening 6b in the machine bed 5 10d, 10e, 10h, 10i, then through the inner and middle flow channels 10c, 10f, 10g, 10j arranged next to these and finally through the outer flow channels 10a, 10b, 10k, 10l. The intermediate plate 11 is heated by the hot water circuit and in turn heats the adjacent contact surfaces of the machine bed 5 and the clamping plate 4. As a result, the machine bed 5 is heated more in its upper area than in its lower area, which causes it to expand due to different thermal expansion above, ie in the direction of the plunger 2, warped.

Da hier die Erwärmung durch die den Begrenzungswandungen des Durchbruchs 6b am nächsten liegenden Strömungskanäle 10d, 10e, 10h, 10i am stärksten ist, verwölbt sich das Maschinenbett 5 in den Bereichen angrenzend an den Durchbruch 6b stärker nach oben als in den Bereichen der Längsseiten, welche weniger stark durch die äusseren Strömungskanäle 10a, 10b, 10k, 101 erwärmt werden. Die Aufspannplatte 4, welche über die Zwischenplatte 11 schubsteif mit dem Maschinenbett 5 verbunden ist und aus einem Material mit einem grösseren Wärmeausdehnungskoeffizienten als das Material des Maschinenbetts 5 gebildet ist, leitet zusätzliche Schubkräfte in das Maschinenbett 5 ein, welche dessen Verwölbung nach oben verstärken. Wie schon bei der Ausführungsform gemäss Fig. 3 kommt es im Betrieb unter der Belastung durch die Stanzkraft zu einer Kompensation dieser Verwölbung, welche idealerweise dazu führt, dass das Maschinenbett 5 unter maximaler Stanzkraftbelastung sowohl in Längs- als auch in Querrichtung eben ist, d.h. nicht verwölbt bzw. nicht durchgebogen ist. Diese Lösung weist den Vorteil auf, dass bestehende Maschinen mit einer entsprechenden Zwischenplatte 11 auf einfache Weise zu einer erfindungsgemässen Stanzpresse umgerüstet werden können.Since the heating is strongest here through the flow channels 10d, 10e, 10h, 10i that are closest to the boundary walls of the opening 6b, the machine bed 5 warps upwards more in the areas adjacent to the opening 6b than in the areas of the longitudinal sides, which are heated to a lesser extent by the outer flow channels 10a, 10b, 10k, 101. The clamping plate 4, which is connected to the machine bed 5 in a shear-resistant manner via the intermediate plate 11 and is made of a material with a greater coefficient of thermal expansion than the material of the machine bed 5, introduces additional shear forces into the machine bed 5, which increase its warping upwards. As in the embodiment according to 3 During operation, under the load from the punching force, this warping is compensated, which ideally means that the machine bed 5 is flat both in the longitudinal and transverse direction under maximum punching force load, ie is not warped or bent. This solution has the advantage that existing machines with a corresponding intermediate plate 11 can easily be converted into a stamping press according to the invention.

In Fig. 5 ist ein erfindungsgemässer Stanzautomat mit Oberantrieb dargestellt, wobei das Maschinenunterteil mit dem Antrieb 1 in Querrichtung geschnitten dargestellt ist und der Stössel 2 teilweise geschnitten dargestellt ist. Die Aufspannplatte 4 ist nicht geschnitten dargestellt.In figure 5 an automatic stamping machine according to the invention with an upper drive is shown, the lower part of the machine being cut with the drive 1 in the transverse direction is shown and the plunger 2 is shown partially in section. The clamping plate 4 is not shown in section.

Wie zu erkennen ist, weist der Stössel 2, welcher durch Zugsäulen 3 angetrieben und geführt ist, im Bereich seiner Unterseite mehrere Längsbohrungen auf, welche von Widerstandsheizelementen 12 durchsetzt sind. Diese werden im Betrieb mit elektrischem Strom beaufschlagt, wodurch der Stössel 2 im Bereich seiner Unterseite stärker erwärmt wird als in seinem oberen Bereich und sich infolgedessen infolge unterschiedlicher Wärmedehnung nach unten, d.h. in Richtung auf das Maschinenbett 5 zu, verwölbt. Im Betrieb kommt es unter der Belastung durch die Stanzkraft zu einer Kompensation dieser wärmedehnungsbedingten Verwölbung, so dass der Stössel 2 im Idealfall unter maximaler Stanzkraftbelastung gerade, d.h. nicht verwölbt bzw. nicht durchgebogen, ist. Hierdurch kann einem Verlust an Stanzpräzision und einem erhöhten Werkzeugverschleiss wirkungsvoll entgegengewirkt werden.As can be seen, the ram 2, which is driven and guided by tension columns 3, has a plurality of longitudinal bores in the area of its underside, through which resistance heating elements 12 pass. Electric current is applied to these during operation, as a result of which the ram 2 is heated more in the area of its underside than in its upper area and consequently warps downwards, i.e. in the direction of the machine bed 5, as a result of different thermal expansion. During operation, under the load from the punching force, this warping caused by thermal expansion is compensated for, so that the ram 2 is straight under maximum punching force loading, i.e. not warped or bent. This can effectively counteract a loss of punching precision and increased tool wear.

Fig. 6 zeigt einen weiteren erfindungsgemässen Stanzautomaten mit Oberantrieb, welcher sich von dem in Fig. 5 gezeigten lediglich dadurch unterscheidet, dass hier nicht im Stössel 2 selbst Heizelemente 12 angeordnet sind, sondern in einer Zwischenplatte 11, welche der Befestigung der oberen Werkzeugteile am Stössel 2 dient. Der hiermit erzielte Effekt ist identisch wie zuvor beschrieben, jedoch weist diese Lösung den Vorteil auf, dass bestehende Maschinen mit einer entsprechenden Zwischenplatte 11 auf einfache Weise zu einer erfindungsgemässen Stanzpresse umgerüstet werden können. 6 shows another punching machine according to the invention with a top drive, which differs from that in figure 5 shown differs only in that heating elements 12 are not arranged in the ram 2 itself, but in an intermediate plate 11, which is used to attach the upper tool parts to the ram 2. The effect achieved in this way is identical to that described above, but this solution has the advantage that existing machines with a corresponding intermediate plate 11 can easily be converted into a stamping press according to the invention.

Während in der vorliegenden Anmeldung bevorzugte Ausführungen der Erfindung beschrieben sind, ist klar darauf hinzuweisen, dass die Erfindung nicht auf diese beschränkt ist und auch in anderer Weise innerhalb des Umfangs der nun folgenden Ansprüche ausgeführt werden kann.While the present application describes preferred embodiments of the invention, it is to be understood that the invention is not limited thereto and may be otherwise embodied within the scope of the following claims.

Claims (25)

  1. Method for warping the machine bed (5) and/or the press ram (2) of a punching press to compensate at least partially a bending caused by the punching force during punching operation, wherein a temperature gradient is produced within the machine bed (5) or a supporting structure (4, 5, 11) for the lower tool elements built with the machine bed (5), respectively, and/or within the press ram (2) or a supporting structure (2, 11) for the upper tool elements built with the press ram (2), respectively, with the effect of making the machine bed (5) warping in the direction towards the press ram (2) and/or of making the press ram (2) warping in the direction towards the machine bed (5).
  2. Method according to claim 1, wherein the temperature gradient is produced by heating the machine bed (5) in the area of its side facing the press ram (2) and/or by heating the press ram (2) in the area of its side facing the machine bed (5).
  3. Method according to claim 2, wherein for heating, electrical heating elements arranged within the machine bed (5) and/or within the press ram (2) are charged with electric current for producing the temperature gradient.
  4. Method according to one of the preceding claims, wherein the temperature gradient is produced by cooling the machine bed in the area of its side facing away from the press ram and/or by cooling the press ram in the area of its side facing away from the machine bed.
  5. Method according to one of the preceding claims, wherein for producing the temperature gradient, flow channels (10a-10f) arranged within the machine bed (5) and/or within the press ram are flowed through by a heated or cooled, gaseous or liquid medium (8).
  6. Method according to claim 5, wherein heated lubricating oil (8) of a lubricating oil circuit of the punching press is conducted through the flow channels (10a-10f).
  7. Method according to one of the preceding claims, wherein a clamping plate arranged on the machine bed is present, which clamping plate is heated, for warping the machine bed in the direction towards the press ram due to a heating of it by the clamping plate at its side facing the ram and/or for warping the machine bed in the direction towards the press ram due to an introduction of shear forces produced by a thermal expansion of the clamping plate into the side of the machine bed facing the ram.
  8. Method according to one of the preceding claims, wherein a clamping plate (4) arranged on the machine bed (5) is present and a heating device (11) arranged between the machine bed (5) and the clamping plate (4), which is heated, for warping the machine bed (5) in the direction towards the press ram (2) due to a heating of it by the heating device (11) at its side facing the ram (2) and/or for warping the machine bed (5) in the direction towards the press ram (2) due to a heating of the clamping plate (4) by the heating device (11) and an introduction of shear forces produced by a thermal expansion of the clamping plate (4) into the side of the machine bed (5) facing the ram (2).
  9. Method according to one of the preceding claims, wherein the machine bed (5) has an aperture (6b) for carrying away punched parts and rubbish, and wherein the temperature gradient within the machine bed (5) is produced such that the machine bed (5) warps stronger in the area adjacent to the aperture (6b) in the direction towards the press ram (2) than in the areas adjacent to its longitudinal sides.
  10. Method according to claim 2 and to claim 9, wherein the machine bed (5) is heated in the area of its side facing the press ram (2) stronger close to the boundaries of the aperture (6b) than close to its longitudinal sides.
  11. Method according to claim 3 and to claim 9, wherein the machine bed is cooled in the area of its side facing away from the press ram stronger close to the boundaries of the aperture than close to its longitudinal sides.
  12. Method according to one of the preceding claims, wherein the warping of the machine bed (5) and/or of the press ram (2) is adjusted as a function of parameters of the punching operation, in particular as a function of a calculated or measured maximal punching force, and in particular, wherein the warping is adjusted during the intended operation of the press.
  13. Punching press, in particular for carrying out the method according to one of the preceding claims, with a machine bed (5) and with a press ram (2) working against the machine bed (5),
    wherein means (8, 9a, 9c, 10a-10f; 10a-101, 11; 12; 11, 12) are present for warping the machine bed (5) in the direction towards the press ram (2) and/or for warping the press ram (2) in the direction towards the machine bed (5) by producing a temperature gradient within the machine bed (5) or a supporting structure (4, 5; 4, 5, 11) for the lower tool elements built with machine bed (5), respectively, and/or within the press ram (2) or a supporting structure (2, 11) for the upper tool elements built with the press ram (2), respectively,
    wherein the means (8, 9a, 9c, 10a-10f) for warping the machine bed and/or the press ram comprise flow channels (10a-10f) arranged within the machine bed (5) and/or within the press ram, which flow channels can be flowed through by a heated or cooled, gaseous of liquid medium (8) during the intended operation, for producing the temperature gradients,
    wherein the press comprises a lubricating oil circuit and the means for warping the machine bed and/or the press ram comprise arrangements, by means of which heated lubricating oil of the lubricating oil circuit can be conducted through the flow channels during the intended operation,
    wherein the punching press comprises a press control unit, by means of which the warping of the machine bed (5) and/or of the press ram (2) can be adjusted in particular automatically, depending on parameters of the punching process, in particular depending on a calculated or measured maximal punching force, and in particular can be adjusted during the intended operation of the press.
  14. Punching press according to claim 13, wherein the means (8, 9a, 9c, 10a-10f; 10a-10l, 11; 12; 11, 12) for warping the machine bed (5) and/or the press ram (2) are adapted to heat the machine bed (5) in the area of its side facing the press ram (2) and/or to heat the press ram (2) in the area of its side facing the machine bed (5).
  15. Punching press according to claim 14, wherein the means for warping the machine bed and/or the press ram (2) comprise electric heating elements (12) arranged within the machine bed and/or the press ram (2), which heating elements can be charged with electric current during the intended operation of the press, for producing the temperature gradient.
  16. Punching press according to one of the claims 13 to 15, wherein the means for warping the machine bed and/or the press ram are built for cooling the machine bed in the area of its side facing away from the press ram and/or for cooling the press ram in the area of its side facing away from the machine bed.
  17. Punching press according to one of the claims 13 to 16, wherein the punching press has means for warping the machine bed and wherein a clamping plate arranged on the machine bed is present, which can be heated with the means for warping the machine bed during the intended operation of the press, for producing the temperature gradients by heating the machine bed at its side facing the ram by the clamping plate.
  18. Punching press according to one of the claims 13 to 17, wherein the punching press has means for warping the machine bed and a clamping plate (4) arranged on the machine bed (5) is present, which clamping plate can be heated by the means (8, 9a, 9c, 10a-10f; 10a-10l, 11) for warping the machine bed (5) during the intended operation of the press and which clamping plate is connected with the machine bed (5) such that it can transfer shear forces to the machine bed (5), for warping the machine bed (5) in the direction towards the press ram (2) due to an introduction of shear forces produced by a thermal expansion of the clamping plate (4) into the side of the machine bed (5) facing the ram (2).
  19. Punching press according to claim 18, wherein a thermal insulation layer is present between the clamping plate and the machine bed, for reducing a heat transfer from the clamping plate to the machine bed.
  20. Punching press according to one of the claims 13 to 19, wherein the punching press has means for warping the machine bed and a clamping plate (4) arranged on the machine bed (5) is present and wherein the means (10a-10l, 11) for warping the machine bed (5) comprise a heating device (11) arranged between the machine bed (5) and the clamping plate (4), which can be operated during the intended operation of the press, for warping the machine bed (5) due to a heating of it at its side facing the ram (2).
  21. Punching press according to one of the claims 13 to 20, wherein the punching press has means for warping the machine bed and a clamping plate (4) arranged on the machine bed (5) is present, which is connected with the machine bed (5) such that it can transfer shear forces to the machine bed (5), and wherein the means (10a-10l, 11) for warping the machine bed (5) comprise a heating device (11) arranged between the machine bed (5) and the clamping plate (4), which heating device can be operated during the intended operation of the press, for warping the machine bed (5) in the direction towards the press ram (3) due to an introduction of shear forces produced by a thermal expansion of the clamping plate (4) into the side of the machine bed (5) facing the ram (2).
  22. Punching press according to one of the claims 13 to 21, wherein the punching press has means for warping the machine bed and the machine bed (5) has an aperture (6B) for carrying away punched parts and rubbish, and wherein the means (8, 9a, 9c, 10a-10f; 10a-10l, 11) for warping the machine bed (5) are built such that these means warp the machine bed stronger in the area adjacent to the aperture (6b) than in the areas adjacent to the long sides of the machine bed (5).
  23. Punching press according to claim 14 and claim 22, wherein the means (8, 9a, 9c, 10a-10f; 10a-10l, 11) are adapted for warping the machine bed (5) in order to heat the machine bed (5) in the area of its side facing the press ram (2) close to the boundaries of the aperture (6b) or to heat it stronger in that area than close to its longitudinal sides.
  24. Punching press according to claim 14 and 23, wherein the means are adapted for warping the machine bed in order to cool the machine bed in the area of its side facing away from the press ram close to the boundaries of the aperture or to cool it stronger in this area than close to its longitudinal sides.
  25. Punching press according to one of the claims 13 to 24, wherein the means for warping the machine bed (5) and/or the press ram (2) are built adjustable, in particular during the intended operation of the press, for enabling a selective adjustment of the warping of the machine bed (5) and/or of the warping of the press ram (2).
EP13859602.8A 2013-06-19 2013-06-19 Method for warping the machine bed and/or the press ram of a punching press and punching press Active EP3010709B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CH2013/000107 WO2014201576A1 (en) 2013-06-19 2013-06-19 Method for warping the machine bed and/or the press ram of a punching press and punching press

Publications (2)

Publication Number Publication Date
EP3010709A1 EP3010709A1 (en) 2016-04-27
EP3010709B1 true EP3010709B1 (en) 2022-06-01

Family

ID=48782803

Family Applications (2)

Application Number Title Priority Date Filing Date
EP13859602.8A Active EP3010709B1 (en) 2013-06-19 2013-06-19 Method for warping the machine bed and/or the press ram of a punching press and punching press
EP13736464.2A Not-in-force EP3010708B1 (en) 2013-06-19 2013-06-27 Method for bending the machine bed of a stamping press, and stamping press

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP13736464.2A Not-in-force EP3010708B1 (en) 2013-06-19 2013-06-27 Method for bending the machine bed of a stamping press, and stamping press

Country Status (6)

Country Link
US (2) US20160144588A1 (en)
EP (2) EP3010709B1 (en)
JP (2) JP6192820B2 (en)
ES (1) ES2663233T3 (en)
SG (2) SG11201510310VA (en)
WO (2) WO2014201576A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SG11201510310VA (en) * 2013-06-19 2016-01-28 Bruderer Ag Method for warping the machine bed and/or the press ram of a punching press and punching press

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Also Published As

Publication number Publication date
US20160136710A1 (en) 2016-05-19
SG11201510310VA (en) 2016-01-28
EP3010709A1 (en) 2016-04-27
US20160144588A1 (en) 2016-05-26
WO2014201577A1 (en) 2014-12-24
JP6192821B2 (en) 2017-09-06
EP3010708B1 (en) 2017-12-20
EP3010708A1 (en) 2016-04-27
ES2663233T3 (en) 2018-04-11
JP6192820B2 (en) 2017-09-06
JP2016523715A (en) 2016-08-12
SG11201510311QA (en) 2016-01-28
JP2016524540A (en) 2016-08-18
WO2014201576A1 (en) 2014-12-24

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