EP3380314B1 - Method for operating a press, in particular a forging crank press - Google Patents

Method for operating a press, in particular a forging crank press Download PDF

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Publication number
EP3380314B1
EP3380314B1 EP16801194.8A EP16801194A EP3380314B1 EP 3380314 B1 EP3380314 B1 EP 3380314B1 EP 16801194 A EP16801194 A EP 16801194A EP 3380314 B1 EP3380314 B1 EP 3380314B1
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Prior art keywords
press
servo drive
mass
mass system
pressing force
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EP16801194.8A
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German (de)
French (fr)
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EP3380314A1 (en
Inventor
Gerhard Voegel
Markus Bieg
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L Schuler GmbH
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L Schuler GmbH
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B1/00—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen
    • B30B1/26—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by cams, eccentrics, or cranks
    • B30B1/266—Drive systems for the cam, eccentric or crank axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J9/00—Forging presses
    • B21J9/10—Drives for forging presses
    • B21J9/18—Drives for forging presses operated by making use of gearing mechanisms, e.g. levers, spindles, crankshafts, eccentrics, toggle-levers, rack bars
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J9/00—Forging presses
    • B21J9/10—Drives for forging presses
    • B21J9/20—Control devices specially adapted to forging presses not restricted to one of the preceding subgroups
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/14—Control arrangements for mechanically-driven presses
    • B30B15/148—Electrical control arrangements

Definitions

  • the invention relates to a method for operating a press according to claim 1 or 2.
  • a servo press is known in which the ram kinematics are influenced to select or determine a movement sequence, with the downward speed of the ram or the upward speed of the ram being changed, for example, in order to facilitate part transport.
  • the method according to the invention for operating a crank press, with at least 80% of its nominal pressing force for forming, in particular for forging workpieces such as in particular a forging crank press provides for the press with a servo drive and between the servo drive and a workpiece, which is arranged during operation of the press equip moving mass system, wherein a mass of the mass system is formed at least by a ram and at least by a drive shaft, wherein the mass system at least temporarily from the servo drive is driven, with the servo drive providing a maximum of 80% of the nominal pressing force for a forming process and the mass of the mass system being accelerated by the servo drive before the forming process in such a way that at least 100% of the nominal pressing force is available during the forming process.
  • the method according to the invention for operating a crank press for forming, in particular for forging workpieces such as in particular a forging crank press, provides for the press to be equipped with a servo drive and a mass system which is arranged between the servo drive and a workpiece and moves during operation of the press, with a mass of the mass system is formed by at least one ram and at least one drive shaft, the mass system being driven at least temporarily by the servo drive, the increased nominal pressing force being provided proportionately by the servo drive and the mass system, and the difference between 80% nominal pressing force and at least 100% Rated pressing force is compensated by increasing the speed of the mass of the mass system and / or by increasing the mass of the mass system.
  • the method provides for the mass system to be used the forming process delivered energy to a subsequent forming process by the servo drive again. This enables continuous, uninterrupted operation of the press.
  • crankshaft is driven by the servo drive, with the ram being driven by the crankshaft and with the servo drive applying to the crankshaft outside and during the forming process at most a torque which is at least 20% less than the torque at 100% nominal pressing force.
  • the servo drive and its converter can be dimensioned significantly smaller than servo drives and converters of presses with comparable nominal pressing forces.
  • an inherent centrifugal mass of the press is formed by the ram and in particular by the ram and the drive shaft and preferably also by an additional mass. As a result, sufficient mass is available for storing energy, which can also be increased by retrofitting existing presses when using an additional mass.
  • the workpiece is formed proportionately by the drive power of the servo drive and proportionately with the release of kinetic energy from the mass system. This makes it possible to dimension the servo drive small in relation to the nominal power of the press.
  • the servo drive provides a maximum of 80% of the nominal pressing force of the press for a forming process and that the mass system, as a result of acceleration by the servo drive, provides at least 20% of the nominal pressing force of the press for the forming process.
  • the servo drive and an electrical converter connected upstream of it are cost-effective components when measured against the nominal pressing force of the press.
  • a diagram D1 is shown in which a speed DZ of a servo drive specified in revolutions per minute is plotted against a position ST of a ram for a press, the press starting from a position I in which the ram is at top dead center OT1. From a standstill, the speed DZ of the servo drive is continuously increased to 75 rpm, whereby the kinetic energy contained in a mass system downstream of the servo drive builds up and increases. From a position II of the tappet, which is about 50 mm before its reversal point or bottom dead center UT1, the speed of 75 rpm is maintained.
  • a in the figure 2 second diagram D2 shown how the ram passes the top dead center OT2 at the beginning of a second cycle at a speed of the servo drive of 10 rpm and thus already full of energy.
  • the servo drive then revs up to a speed of 75 rpm, further increasing the kinetic energy of the mass system.
  • the subsequent further procedure is the same as that for the figure 1 further procedure described.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Press Drives And Press Lines (AREA)
  • Forging (AREA)
  • Control Of Presses (AREA)

Description

Die Erfindung betrifft ein Verfahren zum Betrieb einer Presse gemäß Anspruch 1 bzw. 2.The invention relates to a method for operating a press according to claim 1 or 2.

Aus der DE 10 2009 049 146 B3 ist eine Servopresse bekannt, bei welcher zur Auswahl oder Bestimmung eines Bewegungsablaufs auf die Stößelkinematik Einfluss genommen wird, wobei z.B. die Abwärtsgeschwindigkeit des Stößels oder die Aufwärtsgeschwindigkeit des Stößels verändert wird, um einen Teiletransport zu erleichtern.From the DE 10 2009 049 146 B3 a servo press is known in which the ram kinematics are influenced to select or determine a movement sequence, with the downward speed of the ram or the upward speed of the ram being changed, for example, in order to facilitate part transport.

Aus der CN 203 267 237 U ist ein Schwungrad-Energiespeicher für eine Presse bekannt, welcher einfach und kompakt im Aufbau ist, welcher eine hohe Energiespeichereffizienz aufweist, welcher das Schwungrad verwendet, um den im Stand der Technik eingesetzten Hochleistungskondensator für die Energiespeicherung zu ersetzen, und welcher offensichtlich die Produktionskosten senkt.From the CN 203 267 237 U there is known an energy storage flywheel for a press, which is simple and compact in structure, has high energy storage efficiency, uses the flywheel to replace the prior art high-capacity capacitor for energy storage, and obviously reduces the production cost.

Aus der US 2005/189900 A1 ist ein Verfahren zum Betrieb einer Kurbelpresse gemäss dem Oberbegriff des Anspruchs 1 mit einem Stößel bekannt, der durch eine Antriebseinrichtung in einer Arbeitsrichtung hin und her bewegbar ist, wobei die Antriebseinrichtung wenigstens einen Servomotor aufweist, der an eine Steuereinrichtung angeschlossen und mit dem Stößel treibend verbunden ist, und mit wenigstens einer drehbar gelagerten Schwungmasse, die mit dem Servomotor verbunden ist, wobei das Schwungmoment der Schwungmasse so gering bemessen ist, dass die Presse mit Reversierung des Servomotors zur Durchführung von Pressenhüben betreibbar ist.From the U.S. 2005/189900 A1 discloses a method for operating a crank press according to the preamble of claim 1 with a ram which can be moved back and forth in a working direction by a drive device, the drive device having at least one servomotor which is connected to a control device and drivingly connected to the ram is, and with at least one rotatably mounted centrifugal mass, which is connected to the servomotor, the centrifugal moment of the centrifugal mass being dimensioned so low that the press can be operated by reversing the servomotor to carry out press strokes.

Schließlich ist aus der DE 10 2013 105 468 A1 1 ein Verfahren zur Steuerung einer Presse mit einem elektrischen Antriebsmotor bekannt, der über ein Pressengetriebe mit variabler Getriebeübersetzung mit einem in Hubrichtung zwischen einem oberen Umkehrpunkt und einem unteren Umkehrpunkt bewegbar gelagerten Stößel verbunden ist und mit einer Steuereinrichtung, die den elektrischen Antriebsmotors steuert oder regelt, wobei das Verfahren die folgenden Schritte umfasst: Vorgeben einer maximalen Presskraft für die Presse, weiterhin Bestimmen eines positionsabhängigen Maximaldrehmoments für den elektrischen Antriebsmotor abhängig von der maximalen Presskraft und der Getriebeübersetzung und schließlich Steuern oder Regeln des elektrischen Antriebsmotors, derart dass die vom Stößel ausgeübte Presskraft über die gesamten Hubbewegung kleiner ist als die maximale Presskraft.Finally is out of the DE 10 2013 105 468 A1 1 a procedure for controlling a press with an electric drive motor, which is connected via a press gear with a variable gear ratio to a ram that is movably mounted in the lifting direction between an upper reversal point and a lower reversal point, and to a control device that controls or regulates the electric drive motor, the method includes the following steps: specifying a maximum pressing force for the press, further determining a position-dependent maximum torque for the electric drive motor depending on the maximum pressing force and the gear ratio and finally controlling or regulating the electric drive motor in such a way that the pressing force exerted by the ram over the entire stroke movement is smaller than the maximum pressing force.

Es ist Aufgabe der Erfindung, ein Verfahren zum Betrieb vorzuschlagen, welches ermöglicht, den Servoantrieb und dessen Umrichter trotz vergleichsweise hoher Leistung der Presse klein und damit kostengünstig zu dimensionieren.It is the object of the invention to propose an operating method which enables the servo drive and its converter to be dimensioned small and therefore inexpensive despite the comparatively high output of the press.

Diese Aufgabe wird durch die Merkmale des Anspruchs 1 bzw. 2 gelöst. In den jeweiligen Unteransprüchen sind vorteilhafte und zweckmäßige Weiterbildungen angegeben.This object is solved by the features of claims 1 and 2, respectively. Advantageous and expedient developments are specified in the respective dependent claims.

Das erfindungsgemäße Verfahren zum Betrieb einer Kurbelpresse, mit wenigstens 80% ihrer Nennpresskraft zum Umformen, insbesondere zum Schmieden von Werkstücken wie insbesondere einer Schmiedekurbelpresse, sieht vor, die Presse mit einem Servoantrieb und einem zwischen dem Servoantrieb und einem Werkstück angeordnetem, sich im Betrieb der Presse bewegendes Massensystem auszustatten, wobei eine Masse des Massensystems wenigstens durch einen Stößel und wenigstens durch eine Antriebswelle gebildet ist, wobei das Massensystem wenigstens zeitweise von dem Servoantrieb angetrieben wird, wobei von dem Servoantrieb maximal 80% der Nennpresskraft für einen Umformvorgang zur Verfügung gestellt wird und wobei die Masse des Massensystems durch den Servoantrieb vor dem Umformvorgang derart beschleunigt wird, dass beim Umformvorgang mindestens 100% der Nennpresskraft zur Verfügung stehen. Hierdurch ist es möglich, den Servoantrieb in seiner maximalen Leistung im Vergleich zu einer maximalen Nennpresskraft der Presse zu klein zu dimensionieren. Hierdurch werden der Servoantrieb und ein diesem vorgeschalteter elektrischer Umrichter gemessen an der Nennpresskraft der Presse zu kostengünstigen Bauteilen.The method according to the invention for operating a crank press, with at least 80% of its nominal pressing force for forming, in particular for forging workpieces such as in particular a forging crank press, provides for the press with a servo drive and between the servo drive and a workpiece, which is arranged during operation of the press equip moving mass system, wherein a mass of the mass system is formed at least by a ram and at least by a drive shaft, wherein the mass system at least temporarily from the servo drive is driven, with the servo drive providing a maximum of 80% of the nominal pressing force for a forming process and the mass of the mass system being accelerated by the servo drive before the forming process in such a way that at least 100% of the nominal pressing force is available during the forming process. This makes it possible to dimension the servo drive at its maximum output too small compared to a maximum nominal pressing force of the press. As a result, the servo drive and an electrical converter connected upstream of it are cost-effective components when measured against the nominal pressing force of the press.

Das erfindungsgemäße Verfahren zum Betrieb einer Kurbelpresse zum Umformen, insbesondere zum Schmieden von Werkstücken wie insbesondere einer Schmiedekurbelpresse, siehe vor, die Presse mit einem Servoantrieb und einem zwischen dem Servoantrieb und einem Werkstück angeordnetem, sich im Betrieb der Presse bewegenden Massensystem auszustatten, wobei eine Masse des Massensystems wenigstens durch einen Stößel und wenigstens durch eine Antriebswelle gebildet ist, wobei das Massensystem wenigstens zeitweise von dem Servoantrieb angetrieben wird, wobei die erhöhte Nennpresskraft anteilig von dem Servoantrieb und dem Massensystem bereitgestellt wird und wobei die Differenz zwischen 80% Nennpresskraft und wenigstens 100% Nennpresskraft durch eine Erhöhung der Drehzahl der Masse des Massensystems und/oder durch eine Erhöhung der Masse des Massensystems ausgeglichen wird. Hierdurch ist es möglich, den Servoantrieb in seiner maximalen Leistung im Vergleich zu einer maximalen Nennpresskraft der Presse zu klein zu dimensionieren. Hierdurch werden der Servoantrieb und ein diesem vorgeschalteter elektrischer Umrichter gemessen an der Nennpresskraft der Presse zu kostengünstigen Bauteilen. Weiterhin sieht das Verfahren vor, dem Massensystem seine bei dem Umformvorgang abgegebene Energie bis zu einem nachfolgenden Umformvorgang durch den Servoantrieb wieder zuzuführen. Hierdurch ist ein kontinuierlicher, unterbrechungsfreier Betrieb der Presse möglich.The method according to the invention for operating a crank press for forming, in particular for forging workpieces such as in particular a forging crank press, provides for the press to be equipped with a servo drive and a mass system which is arranged between the servo drive and a workpiece and moves during operation of the press, with a mass of the mass system is formed by at least one ram and at least one drive shaft, the mass system being driven at least temporarily by the servo drive, the increased nominal pressing force being provided proportionately by the servo drive and the mass system, and the difference between 80% nominal pressing force and at least 100% Rated pressing force is compensated by increasing the speed of the mass of the mass system and / or by increasing the mass of the mass system. This makes it possible to dimension the servo drive at its maximum output too small compared to a maximum nominal pressing force of the press. As a result, the servo drive and an electrical converter connected upstream of it are cost-effective components when measured against the nominal pressing force of the press. Furthermore, the method provides for the mass system to be used the forming process delivered energy to a subsequent forming process by the servo drive again. This enables continuous, uninterrupted operation of the press.

Weiterhin ist es vorgesehen, die Presse als kontinuierlich umlaufende Presse zu betrieben. Hierdurch kann eine dynamische Energie, welche das Massensystem am Ende eines Zyklus aufweist, in einen nachfolgenden Zyklus übernommen werden.Furthermore, it is intended to operate the press as a continuously circulating press. As a result, dynamic energy that the mass system has at the end of a cycle can be transferred to a subsequent cycle.

Es ist auch vorgesehen, dass die Kurbelwelle von dem Servoantrieb angetrieben wird, wobei der Stößel von der Kurbelwelle angetrieben wird und wobei von dem Servoantrieb auf die Kurbelwelle außerhalb und während des Umformvorgangs höchstens ein Drehmoment aufgebracht wird, welches mindestens 20% kleiner als das Drehmoment bei 100% Nennpresskraft ist. Bei Anwendung eines derartigen Verfahrens lassen sich der Servoantrieb und dessen Umrichter signifikant kleiner dimensionieren als Servoantriebe und Umrichter von Pressen mit vergleichbaren Nennpresskräften.It is also provided that the crankshaft is driven by the servo drive, with the ram being driven by the crankshaft and with the servo drive applying to the crankshaft outside and during the forming process at most a torque which is at least 20% less than the torque at 100% nominal pressing force. When using such a method, the servo drive and its converter can be dimensioned significantly smaller than servo drives and converters of presses with comparable nominal pressing forces.

Weiterhin ist es vorgesehen, dass eine Eigenschwungmasse der Presse durch den Stößel und insbesondere durch den Stößel und die Antriebswelle und vorzugsweise auch noch durch eine Zusatzmasse gebildet wird. Hierdurch steht zur Speicherung von Energie eine ausreichende Masse zur Verfügung, welche bei Verwendung einer Zusatzmasse auch an bestehenden Pressen im Wege einer Nachrüstung erhöhbar ist.Furthermore, it is provided that an inherent centrifugal mass of the press is formed by the ram and in particular by the ram and the drive shaft and preferably also by an additional mass. As a result, sufficient mass is available for storing energy, which can also be increased by retrofitting existing presses when using an additional mass.

Es ist weiterhin vorgesehen, für den Umformvorgang die in dem Massensystems enthaltene Bewegungsenergie zu nutzen und nicht die jeweils erforderliche, volle Umformenergie aus einem elektrischen Netz zu beziehen. Hierdurch kann das Massensystem einen erheblichen Energieanteil zur Verfügung stellen.Provision is also made to use the kinetic energy contained in the mass system for the forming process and not to obtain the full forming energy required in each case from an electrical network. As a result, the mass system can make a significant amount of energy available.

Weiterhin ist es vorgesehen, bei einem wenigstens 80% der Nennleistung der Presse erfordernden Umformvorgang das Werkstück anteilig durch eine Antriebsleistung des Servoantriebs und anteilig unter Abgabe kinetischer Energie des Massensystems umzuformen. Hierdurch ist es möglich, den Servoantrieb im Verhältnis zur Nennleistung der Presse klein zu dimensionieren.Furthermore, it is provided that in a forming process requiring at least 80% of the nominal power of the press, the workpiece is formed proportionately by the drive power of the servo drive and proportionately with the release of kinetic energy from the mass system. This makes it possible to dimension the servo drive small in relation to the nominal power of the press.

Es ist vorgesehen, dass von dem Massensystem bei der Umformung wenigstens kinetische Energie im Umfang von 20% der Nennleistung der Presse abgegeben wird. Hierdurch trägt das Massensystem erheblich zur Umformung bei.It is envisaged that at least 20% of the rated power of the press will be released by the mass system during the forming process. As a result, the mass system contributes significantly to the forming.

Bei der Presse ist es vorgesehen, dass der Servoantrieb maximal 80% einer Nennpresskraft der Presse für einen Umformvorgang zur Verfügung stellt und dass das Massensystem in Folge einer Beschleunigung durch den Servoantrieb, wenigstens 20% der Nennpresskraft der Presse für den Umformvorgang zur Verfügung stellt. Hierdurch ist es möglich, in Bezug auf eine Nennpresskraft der Presse eine Unterdimensionierung des Servoantriebs bezüglich seiner maximalen Leistung vorzunehmen. Hierdurch werden der Servoantrieb und ein diesem vorgeschalteter elektrischer Umrichter gemessen an der Nennpresskraft der Presse zu kostengünstigen Bauteilen.In the case of the press, it is provided that the servo drive provides a maximum of 80% of the nominal pressing force of the press for a forming process and that the mass system, as a result of acceleration by the servo drive, provides at least 20% of the nominal pressing force of the press for the forming process. This makes it possible to undersize the servo drive with regard to its maximum power in relation to a nominal pressing force of the press. As a result, the servo drive and an electrical converter connected upstream of it are cost-effective components when measured against the nominal pressing force of the press.

Schließlich ist es vorgehsehen den Servoantrieb mit der Antriebwelle zu verbinden. Hierdurch ist dieser direkt an das Massensystem angeschlossen und kann unmittelbar auf diese einwirken.Finally, it is planned to connect the servo drive to the drive shaft. As a result, it is directly connected to the mass system and can act on it directly.

Weitere Einzelheiten der Erfindung werden in der Zeichnung anhand von schematisch dargestellten Ausführungsbeispielen beschrieben.Further details of the invention are described in the drawing with reference to exemplary embodiments shown schematically.

Hierbei zeigt:This shows:

Figur 1:Figure 1:
ein Diagramm, bei welchem für eine Presse eine Drehzahl eines Servoantriebs über einer Stellung eines Stößels abgetragen ist, wobei die Presse aus einer Stellung anläuft, in welcher der Stößel im oberen Totpunkt steht unda diagram in which a speed of a servo drive is plotted against a position of a ram for a press, the press starts from a position in which the ram is at top dead center and
Figur 2:Figure 2:
ein Diagramm, bei welchem für die Presse wieder die Drehzahl des Servoantriebs über der Stellung des Stößels abgetragen ist, wobei die Presse aus einer Stellung weiterläuft, in welcher - in Fortsetzung des im dem ersten Diagramm gezeigten Ablaufs - der Stößel den oberen Totpunkt bei einer Drehzahl von 10 U/min passiert.a diagram in which the speed of the servo drive is again plotted against the position of the ram for the press, the press continuing to run from a position in which - in continuation of the sequence shown in the first diagram - the ram reaches top dead center at a speed of 10 rpm happened.

In der Figur 1 ist ein Diagramm D1 gezeigt, bei welchem für eine Presse eine in Umdrehungen pro Minute angegebene Drehzahl DZ eines Servoantriebs über einer Stellung ST eines Stößels abgetragen ist, wobei die Presse aus einer Stellung I anläuft, in welcher der Stößel im oberen Totpunkt OT1 steht. Aus dem Stillstand heraus wird die Drehzahl DZ des Servoantriebs kontinuierlich auf 75 U/min erhöht, wobei sich hierbei auch eine in einem dem Servoantrieb nachgelagerten Massensystem enthaltene Bewegungsenergie aufbaut und erhöht. Ab einer Stellung II des Stößels, welche etwa 50 mm vor dessen Umkehrpunkt bzw. unteren Totpunkt UT1 liegt, wird die Drehzahl von 75 U/min beibehalten. Während eines Umformprozesses UFP1, welcher etwa beginnt, wenn der Stößel 1,5 mm vor seinem unteren Totpunkt UT1 steht und welcher etwa endet, wenn der Stößel etwa 2,5 mm bis 4,5 mm hinter seinem unteren Totpunkt UT1 steht, fällt die Drehzahl DZ von 75 U/min auf 60 U/min um 20% ab, da für den Umformprozess neben der von dem Servoantrieb zur Verfügung gestellten Energie auch in dem Massensystem gespeicherte Energie benötigt wird. Anschließend fällt die Drehzahl DZ des Servoantriebs weiter ab, da unter Verwendung des Servoantriebs eine Energierückspeisung erfolgt, um ein ausreichendes Zeitfenster für einen Teiletransport und eine Pfleger des Gesenks sicher zu stellen. Während der Energierückspeisung wird der Servoantrieb als Generator betrieben. Sobald der Teiletransport und die Pflege des Gesenks abgeschlossen sind, wird dem Massensystem ab einer Stellung III des Stößels - noch bevor dieser wieder den oberen Totpunkt OT2 erreicht - durch eine Erhöhung der Drehzahl des Servoantriebs wieder Energie zugeführt.In the figure 1 a diagram D1 is shown in which a speed DZ of a servo drive specified in revolutions per minute is plotted against a position ST of a ram for a press, the press starting from a position I in which the ram is at top dead center OT1. From a standstill, the speed DZ of the servo drive is continuously increased to 75 rpm, whereby the kinetic energy contained in a mass system downstream of the servo drive builds up and increases. From a position II of the tappet, which is about 50 mm before its reversal point or bottom dead center UT1, the speed of 75 rpm is maintained. During a forming process UFP1, which begins approximately when the ram is 1.5 mm before its bottom dead center UT1 and which ends approximately when the ram is approximately 2.5 mm to 4.5 mm behind its bottom dead center UT1, the speed falls DZ decreases by 20% from 75 rpm to 60 rpm, since energy stored in the mass system is required for the forming process in addition to the energy provided by the servo drive. The speed DZ of the servo drive then drops further, since energy is fed back using the servo drive in order to ensure a sufficient time window for transporting parts and maintaining the die. During energy recovery, the servo drive is operated as a generator. As soon as the transport of the parts and the maintenance of the die are completed, the mass system is assigned a Position III of the ram - before it reaches top dead center OT2 again - is supplied with energy again by increasing the speed of the servo drive.

Entsprechend zeigt ein in der Figur 2 gezeigtes zweites Diagramm D2 wie der Stößel den oberen Totpunkt OT2 zu Beginn eines zweiten Zyklus bei einer Drehzahl des Servoantriebs von 10 U/min und damit bereits energiegeladen passiert. In dem in der Figur 2 gezeigten zweiten Zyklus dreht der Servoantrieb dann wieder auf eine Drehzahl von 75 U/min hoch und erhöht hierbei weiter die Bewegungsenergie des Massensystems. Der nachfolgende, weitere Ablauf gleicht dem zu der Figur 1 beschrieben weiteren Ablauf. Um den unteren Totpunkt UT2 herum erfolgt wieder ein starker Drehzahlabfall, da das Massensystem Energie abgibt. Anschließend sinkt die Drehzahl durch Energierückspeisung ebenfalls wieder weiter ab und wird dann wieder erhöht, damit der Stößel den oberen Totpunkt OT3 bei einer Drehzahl des Servoantriebs von 10 U/min durchläuft.Accordingly, a in the figure 2 second diagram D2 shown how the ram passes the top dead center OT2 at the beginning of a second cycle at a speed of the servo drive of 10 rpm and thus already full of energy. In the in the figure 2 In the second cycle shown, the servo drive then revs up to a speed of 75 rpm, further increasing the kinetic energy of the mass system. The subsequent further procedure is the same as that for the figure 1 further procedure described. Around the bottom dead center UT2 there is again a sharp drop in speed since the mass system releases energy. The speed then drops again due to energy recovery and is then increased again so that the ram passes through top dead center OT3 at a speed of the servo drive of 10 rpm.

Bezugszeichenliste:Reference list:

D1D1
erstes Diagrammfirst chart
D2D2
zweites Diagrammsecond chart
DZdouble room
Drehzahl des ServoantriebsSpeed of the servo drive
OT1OT1
oberer Totpunkt im ersten Zyklustop dead center in the first cycle
OT2OT2
oberer Totpunkt im zweiten Zyklustop dead center in the second cycle
STST
Stellung des Stößelsposition of the plunger
UFP1UFP1
Umformprozess im ersten ZyklusForming process in the first cycle
UFP2UFP2
Umformprozess im zweiten ZyklusForming process in the second cycle
UT1UT1
unterer Totpunkt im ersten Zyklusbottom dead center in the first cycle
UT2UT2
unterer Totpunkt im zweiten Zyklusbottom dead center in the second cycle
II
erste Stellung des Stößels im ersten Zyklusfirst position of the ram in the first cycle
IIII
zweite Stellung des Stößels im ersten Zyklussecond position of the ram in the first cycle
IIIIII
dritte Stellung des Stößels im ersten Zyklusthird position of the ram in the first cycle

Claims (9)

  1. Method for operating a crank press with at least 80% of its nominal pressing force for forming, particular for forging, workpieces, such as in particular a forging crank press,
    - wherein the press comprises a servo drive and a mass system, which is arranged between the servo drive and a workpiece and moves during operation of the press,
    - wherein a mass of the mass system is formed at least by a ram and at least by a drive shaft,
    - wherein the mass system is driven, at least at certain times, by the servo drive,
    - wherein the servo drive makes available a maximum of 80% of the nominal pressing force for a forming operation,
    characterized
    - in that the mass of the mass system is accelerated by the servo drive prior to the forming operation such that at least not less than 100% of the nominal pressing force is available during the forming operation.
  2. Method for increasing the nominal pressing force of a crank press for forming, in particular for forging, workpieces, such as in particular a forging crank press,
    - wherein the press comprises a servo drive and a mass system, which is arranged between the servo drive and a workpiece and moves during operation of the press,
    - wherein a mass of the mass system is formed at least by a ram and at least by a drive shaft,
    - wherein the mass system is driven, at least at certain times, by the servo drive,
    - wherein the increased nominal pressing force is provided, in part, by the servo drive and the mass system,
    characterized
    - in that the difference between 80% nominal pressing force and at least 100% nominal pressing force is compensated for by an increase in the rotational speed of the mass of the mass system and/or by an increase in the mass of the mass system.
  3. Method according to Claim 1 or Claim 2, characterized in that the energy which has been given off during the forming operation is supplied again to the mass system by the servo drive until a following forming operation takes place.
  4. Method according to at least one of the preceding claims, characterized
    - in that the press is operated as a continuous press,
    - wherein energy which is contained in the mass system at the end of one cycle is transferred to a following cycle by continuous operation of the press.
  5. Method according to Claim 1 or 2, characterized
    - in that the crank shaft is driven by the servo drive,
    - in that the ram is driven by the crank shaft, and
    - in that the servo drive applies to the crank shaft, outside and during the forming operation, at most a torque which is equal to a maximum of 80% of a required torque.
  6. Method according to at least one of the preceding claims, characterized in that a flywheel mass of the press is formed by the ram and, in particular, by the ram and the drive shaft and preferably an additional mass.
  7. Method according to at least one of the preceding claims, characterized by using the kinetic energy contained in the mass system, rather than taking the full amount of forming energy which is necessary in each case from a mains power grid.
  8. Method according to Claim 1, characterized in that, during a forming operation which requires at least 80% of the nominal power of the press, the workpiece is formed, in part, by drive power of the servo drive and, in part, with kinetic energy being given off from the mass system.
  9. Method according to Claim 1 and/or 2, characterized in that, during the forming operation, the mass system gives off kinetic energy at least in the region of 20% of the nominal power of the press.
EP16801194.8A 2015-11-26 2016-11-24 Method for operating a press, in particular a forging crank press Active EP3380314B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015120546.7A DE102015120546A1 (en) 2015-11-26 2015-11-26 Method for operating a press, in particular a forging crank press
PCT/EP2016/078613 WO2017089433A1 (en) 2015-11-26 2016-11-24 Method for operating a press, in particular a forging crank press

Publications (2)

Publication Number Publication Date
EP3380314A1 EP3380314A1 (en) 2018-10-03
EP3380314B1 true EP3380314B1 (en) 2023-05-24

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP16801194.8A Active EP3380314B1 (en) 2015-11-26 2016-11-24 Method for operating a press, in particular a forging crank press

Country Status (6)

Country Link
EP (1) EP3380314B1 (en)
JP (1) JP7112956B2 (en)
CN (1) CN108391425B (en)
DE (1) DE102015120546A1 (en)
ES (1) ES2950422T3 (en)
WO (1) WO2017089433A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110142997B (en) * 2019-05-14 2024-01-23 南京农业大学 Motion control method and system for multi-connecting-rod servo press

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DE102013105468A1 (en) * 2013-05-28 2014-12-04 Schuler Pressen Gmbh Method for controlling a press with variable gear ratio

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JP2001062591A (en) * 1999-08-24 2001-03-13 Amada Co Ltd Press machine
JP2003011000A (en) * 2001-06-27 2003-01-15 Yuichi Kiryu Hydraulic circuit of hydraulic press for cold forging and the like
DE102004009256B4 (en) * 2004-02-26 2008-04-03 Schuler Pressen Gmbh & Co. Kg Mechanical multi-servo press
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EP2373482B1 (en) * 2008-12-05 2021-02-03 ABB Schweiz AG A method in a production system for limiting peak power
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CN102019707A (en) * 2010-12-03 2011-04-20 广东锻压机床厂有限公司 Triangular connecting rod-toggle rod transmission mechanism with large force magnification ratio for servo press
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Also Published As

Publication number Publication date
DE102015120546A1 (en) 2017-06-01
JP2018535098A (en) 2018-11-29
ES2950422T3 (en) 2023-10-09
WO2017089433A1 (en) 2017-06-01
CN108391425B (en) 2020-09-04
JP7112956B2 (en) 2022-08-04
EP3380314A1 (en) 2018-10-03
CN108391425A (en) 2018-08-10

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