DE19528558A1 - Procedure for operating hydraulic press - piston chamber of actuating unit connected to hydraulic accumulator so that volume of piston chamber during descending stroke of press slide is transferred to accumulator - Google Patents

Procedure for operating hydraulic press - piston chamber of actuating unit connected to hydraulic accumulator so that volume of piston chamber during descending stroke of press slide is transferred to accumulator

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Publication number
DE19528558A1
DE19528558A1 DE1995128558 DE19528558A DE19528558A1 DE 19528558 A1 DE19528558 A1 DE 19528558A1 DE 1995128558 DE1995128558 DE 1995128558 DE 19528558 A DE19528558 A DE 19528558A DE 19528558 A1 DE19528558 A1 DE 19528558A1
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DE
Germany
Prior art keywords
hydraulic
piston chamber
accumulator
press
valve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
DE1995128558
Other languages
German (de)
Other versions
DE19528558B4 (en
Inventor
Hans-Joachim D Schwindenhammer
Bernd Dipl Ing Bodenstein
Dieter Dipl Ing Therolf
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dieffenbacher GmbH Maschinen und Anlagenbau
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Dieffenbacher GmbH Maschinen und Anlagenbau
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Priority to DE19528558A priority Critical patent/DE19528558B4/en
Publication of DE19528558A1 publication Critical patent/DE19528558A1/en
Application granted granted Critical
Publication of DE19528558B4 publication Critical patent/DE19528558B4/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/16—Control arrangements for fluid-driven presses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/16—Control arrangements for fluid-driven presses
    • B30B15/163—Control arrangements for fluid-driven presses for accumulator-driven presses
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/20576—Systems with pumps with multiple pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/21—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge
    • F15B2211/212—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge the pressure sources being accumulators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/30505—Non-return valves, i.e. check valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/30505—Non-return valves, i.e. check valves
    • F15B2211/30515—Load holding valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/30525—Directional control valves, e.g. 4/3-directional control valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/31—Directional control characterised by the positions of the valve element
    • F15B2211/3105—Neutral or centre positions
    • F15B2211/3111—Neutral or centre positions the pump port being closed in the centre position, e.g. so-called closed centre
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/31—Directional control characterised by the positions of the valve element
    • F15B2211/3144—Directional control characterised by the positions of the valve element the positions being continuously variable, e.g. as realised by proportional valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40515—Flow control characterised by the type of flow control means or valve with variable throttles or orifices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/41—Flow control characterised by the positions of the valve element
    • F15B2211/411—Flow control characterised by the positions of the valve element the positions being discrete
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/415—Flow control characterised by the connections of the flow control means in the circuit
    • F15B2211/41563—Flow control characterised by the connections of the flow control means in the circuit being connected to a pressure source and a return line
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/45—Control of bleed-off flow, e.g. control of bypass flow to the return line
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/47—Flow control in one direction only
    • F15B2211/473—Flow control in one direction only without restriction in the reverse direction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/505—Pressure control characterised by the type of pressure control means
    • F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
    • F15B2211/50518—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using pressure relief valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/515—Pressure control characterised by the connections of the pressure control means in the circuit
    • F15B2211/5157—Pressure control characterised by the connections of the pressure control means in the circuit being connected to a pressure source and a return line
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/55—Pressure control for limiting a pressure up to a maximum pressure, e.g. by using a pressure relief valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/625—Accumulators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/63—Electronic controllers
    • F15B2211/6303—Electronic controllers using input signals
    • F15B2211/6306—Electronic controllers using input signals representing a pressure
    • F15B2211/6309—Electronic controllers using input signals representing a pressure the pressure being a pressure source supply pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/665—Methods of control using electronic components
    • F15B2211/6653—Pressure control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders

Abstract

The piston chamber(3) of the actuating unit(2) is connected to the hydraulic accumulator(10) by hydraulic lines(6) through a safety valve block(5), directional proportional valve(7) and check valve(9) so that the volume of the piston chamber, during the descending stroke of the press slide(1), is transferred to the accumulator. The energy stored in the accumulator is directed through a release valve(16) to supply hydraulic user units(20) which operate at a lower hydraulic pressure than the actuating unit.

Description

Die Erfindung betrifft ein Verfahren zum Betreiben einer hydraulischen Presse zum Umformen bzw. zum Bearbeiten von Werkstücken mit einer hydraulischen Antriebseinheit zum Heben und Senken eines Pressenstößels und eine Vorrichtung zur Durchführung des Verfahrens nach dem Oberbegriff des Vorrichtungsanspruchs.The invention relates to a method for operating a hydraulic press for forming or processing workpieces with a hydraulic Drive unit for lifting and lowering a press ram and one Device for performing the method according to the preamble of Device claim.

Bei hydraulischen Pressen der genannten Art wird die am Rückzugszylinder auftretende Lastenergie nicht genutzt. Es ist jedoch Energieverschwendung, die Lastenergie in Wärme umzusetzen und das Druckniveau im Tank abzubauen. Nachteilig ist weiterhin, daß die Pumpe die volle Antriebsenergie für den Betrieb der Presse bereit halten muß.In the case of hydraulic presses of the type mentioned, that on the retraction cylinder occurring load energy is not used. However, it is a waste of energy that Convert load energy into heat and reduce the pressure level in the tank. Another disadvantage is that the pump has the full drive energy for operation must be ready for the press.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren zum Betreiben einer hydraulischen Presse anzugeben und einer zugehörigen Presse zu schaffen, bei welcher die Lastenergie in wiederverwendbare Energie genutzt werden kann und die oben beschriebenen Nachteile vermieden werden. The invention has for its object a method for operating a hydraulic press and to create an associated press at which the load energy can be used in reusable energy and the disadvantages described above are avoided.  

Diese Aufgabe wird durch die im kennzeichnenden Teil des Anspruchs 1 angegebenen Maßnahmen und Verfahrensschritte sowie durch den Vorrichtungsanspruch erfindungsgemäß gelöst.This object is achieved by the characterizing part of claim 1 specified measures and procedural steps as well as by the Device claim solved according to the invention.

Ein Vorteil der Erfindung ist, die Lastenergie mit einfachen standardmäßigen Hydraulikteilen, wie Proportionalventil und Hydraulikspeicher zu speichern, das heißt einfache Standardteile zur Nutzung der Lastenergie zu verwenden. Sie ist damit für alle Pressen anwendbar und nicht nur dort wo durch Regelungs­ vorgänge sich der erhöhte Aufwand für Hydromotoren und Pumpen erst amortisieren müßte. Der Hauptvorteil liegt weiterhin in der Einsparung der sonst üblichen Steuerpumpe und in einer Energieersparnis bei den Hauptpumpen.An advantage of the invention is the load energy with simple standard Hydraulic parts, such as proportional valve and hydraulic accumulator to store that means to use simple standard parts to use the load energy. she is therefore applicable for all presses and not only where regulation The increased effort for hydraulic motors and pumps is the first step would have to amortize. The main advantage is still the saving of the otherwise usual control pump and in an energy saving with the main pumps.

Somit liegt die Lösung der Erfindung darin, das während des Schließhubes aus dem Kolbenraum des Rückzugszylinders durch die Schwerkraft verdrängte Ölvolumen energetisch zu nutzen. Das Volumen wird in einen Niederdruck- Hydraulikspeicher geladen aus dem dann der Steuerdruck aufrecht erhalten und/oder Niederdruckverbraucher betrieben werden. Durch diese Nutzung der Lastenergie kann bei einer Standard-Kunststoffpresse mit großen Eilganghub eine Hauptpumpe und eine Steuerpumpe gespart werden. Dadurch erniedrigt sich nicht nur der elektrische Energieaufwand sondern auch der Aufwand für die Ölkühlung.Thus, the solution of the invention lies in that during the closing stroke displaced the piston chamber of the retraction cylinder by gravity To use oil volume energetically. The volume is converted into a low pressure Hydraulic accumulator loaded from which the control pressure is then maintained and / or low pressure consumers are operated. By using the Load energy can be with a standard plastic press with a large rapid traverse stroke a main pump and a control pump can be saved. This lowers itself not only the electrical energy expenditure but also the expenditure for the Oil cooling.

Eine weitere Energieersparnis ist zu erreichen, wenn der Rückzugzylinder als Differentialzylinder mit einer Verbindung zwischen Kolben- und Ringraum ausgelegt wird. Dadurch ist es möglich beim Schließvorgang das Öl aus dem Kolbenraum in den Ringraum zurückzuführen, so daß über die Auslaßventile des Sicherheitsblocks nur noch die Überschußmenge in den Tank zurückgeführt werden muß. Durch diesen Zusammenhang kann die Nennweite des Sicherheitsblockes geringer ausgeführt werden, was eine Kostenminderung bei der Herstellung und eine Senkung des Energieverbrauchs und der laufenden Kosten bedingt, was beim Öffnungsvorgang ebenfalls noch unterstützt wird, da durch das oben genannte Schaltventil das Öl des Ringraumes im Differenzialzylinder in den Kolbenraum gedrückt wird und so die Pumpe nur noch die Mengendifferenz, also das Volumen der Kolbenstange, fördern muß.Another energy saving can be achieved if the retraction cylinder as Differential cylinder with a connection between the piston and annulus is interpreted. This makes it possible to remove the oil from the valve during the closing process  Piston chamber in the annulus, so that the exhaust valves of the Safety blocks only the excess amount is returned to the tank must become. Through this connection, the nominal size of the Security block run less, which reduces costs of manufacturing and reducing energy consumption and ongoing Cost depends on what is also supported during the opening process, because through the switching valve mentioned above the oil in the annulus Differential cylinder is pressed into the piston chamber and so the pump only the quantity difference, that is, the volume of the piston rod, must promote.

In den Unteransprüchen sind weitere vorteilhafte und zweckmäßige Ausbildungen der Erfindung angegeben.Further advantageous and expedient training are in the subclaims specified the invention.

Zwei Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt und werden im folgenden näher beschrieben.Two embodiments of the invention are shown in the drawing and are described in more detail below.

Im ersten Ausführungsbeispiel besteht die Antriebseinheit aus dem Stößel 1, dem Kolben 2 und dem Zylinder 3 als Zylindereinheit, für den Schließ- und Öffnungsvorgang der Presse. Beim Schließvorgang wird der Kolben 2 in den Kolbenraum 3 geschoben und das Volumen im Kolbenraum 3 wird dadurch verkleinert. Dieses Volumen muß über die Rohrleitung 6 und den Sicherheitsblock 5 geführt werden. Von dem Sicherheitsblock 5 wird das Volumen über die Rohrleitung 6 an den Anschluß A des Proportionalventil 7 geführt. Bei der Abwärtsbewegung der Presse ist das Proportionalventil 7 in der dargestellten Stellung angesteuert, das heißt der Volumenstrom geht von A nach T in die Rohrleitung 6. Über das Rückschlagventil 9, das durch den Lastenergiedruck aufgesteuert wird, geht das Volumen in den Hydraulikspeicher 10. Der Hydraulikspeicher 10 ist in seinem Volumen so ausgelegt, daß er die Nebenbewegungen der Presse betreiben kann. Ist dieser Hydraulikspeicher 10 gefüllt, was durch den Druckaufnehmer 11 gemeldet wird, wird das Schaltventil 12 eingeschaltet und das überschüssige Volumen in den Tank 13 abgeleitet. Die somit gespeicherte Energie in dem Hydraulikspeicher 10 kann über die Leitung mit dem Freigabeventil 16 an die Nebenfunktion geführt und dort genutzt werden. Als Nebenfunktion gilt der Hydraulik-Hilfskreis 20 für Zylindereinheiten, die mit einem Druckniveau von 40 bar bis 80 bar arbeiten können. Gleichzeitig kann diese Energie auch für das Steuerölsystem über die Steuerölleitung 15 und das Steuerölventil 14 als Steuerölenergieversorgung genutzt werden. Vor dem ersten Arbeitszyklus muß für den ersten Ladevorgang des Hydraulikspeichers 10 von einer Hydraulikpumpe 19 über das Rückschlagventil 18 bei gesperrtem Umlaufventil 17 durch die Rohrleitung der Hydraulikspeicher 10 solange gefüllt werden, bis der Druckmeßaufnehmer 11 die gewünschte Druckhöhe anzeigt. Diese Meldung ist eine Voraussetzung für den Start der Maschine.In the first embodiment, the drive unit consists of the plunger 1 , the piston 2 and the cylinder 3 as a cylinder unit for the closing and opening process of the press. During the closing process, the piston 2 is pushed into the piston chamber 3 and the volume in the piston chamber 3 is thereby reduced. This volume must be routed through the pipeline 6 and the safety block 5 . From the safety block 5 , the volume is conducted via the pipe 6 to the connection A of the proportional valve 7 . When the press moves downward, the proportional valve 7 is activated in the position shown, that is to say the volume flow goes from A to T into the pipeline 6 . The volume goes into the hydraulic accumulator 10 via the check valve 9 , which is controlled by the load energy pressure. The volume of the hydraulic accumulator 10 is designed so that it can operate the secondary movements of the press. If this hydraulic accumulator 10 is filled, which is reported by the pressure sensor 11 , the switching valve 12 is switched on and the excess volume is drained into the tank 13 . The energy thus stored in the hydraulic accumulator 10 can be conducted to the secondary function via the line with the release valve 16 and used there. The auxiliary hydraulic circuit 20 is a secondary function for cylinder units that can operate at a pressure level of 40 bar to 80 bar. At the same time, this energy can also be used for the control oil system via the control oil line 15 and the control oil valve 14 as a control oil energy supply. Before the first work cycle for the first loading of the hydraulic accumulator 10 from a hydraulic pump 19 via the check valve 18 with the circulation valve 17 blocked, the hydraulic accumulator 10 must be filled through the pipeline until the pressure sensor 11 indicates the desired pressure level. This message is a prerequisite for starting the machine.

Das zweite Ausführungsbeispiel für die Antriebseinheit, strichpunktiert getrennt vom Ausführungsbeispiel 1, betrifft eine Differentialschaltung mit Volumenausnützung, die neben der Energieeinsparung noch zur Vereinfachung von hydraulischen Elementen führt, zum Beispiel durch Verkleinerung der Pumpen in ihrem Fördervolumen, aber auch von Ventilen in ihrem Volumendurchlaß. Der Nutzen kommt beim Hochfahren der Presse zur Geltung, wobei in den größeren Kolbenraum 3 das überschüssige Öl des Ringraumes 4 mit hineingefördert wird. Wenn über die Zylindereinheit und Druckbeaufschlagung im Kolbenraum 3 die Presse nach oben fährt, wird das Volumen aus dem Ringraum 4 über das Schaltventil 21 in den Kolbenraum 3 zurückgeführt. Die damit zurückgeführte Menge muß von der Energieversorgungseinheit nicht gefördert werden. Der Vorteil liegt darin, daß somit die Pumpen als Energieversorgungseinheit nicht das volle Volumen aufbringen müssen, das als Aufbrechkraft in dem Kolbenraum 3 erforderlich ist und über den ganzen Hub gebracht werden müßte. Auch die nach den Pumpen liegenden Ventile müssen nur die Restmengen an Volumen bewältigen. Dies bringt eine Kostenersparnis, weil die Aggregate nicht so groß wie bisher üblich ausgelegt werden müssen.The second embodiment for the drive unit, dash-dotted separately from embodiment 1 , relates to a differential circuit with volume utilization, which in addition to saving energy also leads to simplification of hydraulic elements, for example by reducing the pumps in their delivery volume, but also by valves in their volume flow rate. The benefits come into play when the press is started up, the excess oil of the annular space 4 being conveyed into the larger piston chamber 3 . When the press moves upwards via the cylinder unit and pressurization in the piston chamber 3 , the volume is returned from the annular chamber 4 to the piston chamber 3 via the switching valve 21 . The quantity returned in this way does not have to be promoted by the energy supply unit. The advantage lies in the fact that the pumps as the energy supply unit do not have to apply the full volume that is required as the breaking force in the piston chamber 3 and that would have to be brought over the entire stroke. The valves after the pumps only have to deal with the remaining volumes. This saves costs because the units do not have to be designed as large as usual.

Claims (6)

1. Verfahren zum Betreiben einer hydraulischen Presse zum Umformen bzw. zum Bearbeiten von Werkstücken mit einer hydraulischen Antriebseinheit zum Heben und Senken eines Pressenstößels, dadurch gekennzeich­ net, daß der Kolbenraum (3) der Antriebseinheit (2) durch hydraulische Rohrleitungen (6) über einen Sicherheitsblock (5), Richtungsproportionalventil (7) und Rückschlagventil (9) mit einem Hydraulikspeicher (10) so verbunden ist, daß das Volumen des Kolbenraums (3) bei der Abwärtsfahrt des Pressenstößels (1) in den Hydraulikspeicher (10) übertragen wird und daß die im Hydraulikspeicher (10) gespeicherte Energie über ein Freigabeventil (16) zur Energieversorgung von hydraulischen Verbrauchern (20), die mit niedriegerem hydraulischen Druck als die Antriebs- und Arbeitseinheit (2) arbeiten, genutzt wird.1. A method of operating a hydraulic press for forming or processing workpieces with a hydraulic drive unit for lifting and lowering a press ram, characterized in that the piston chamber ( 3 ) of the drive unit ( 2 ) through hydraulic pipes ( 6 ) via a Safety block ( 5 ), directional proportional valve ( 7 ) and check valve ( 9 ) is connected to a hydraulic accumulator ( 10 ) in such a way that the volume of the piston chamber ( 3 ) is transferred into the hydraulic accumulator ( 10 ) when the press ram ( 1 ) moves downwards and that the energy stored in the hydraulic accumulator ( 10 ) is used via a release valve ( 16 ) to supply energy to hydraulic consumers ( 20 ) which work with lower hydraulic pressure than the drive and work unit ( 2 ). 2. Verfahren zum betreiben einer hydraulischen Presse nach Anspruch 1, dadurch gekennzeichnet, daß die im Hydraulikspeicher (10) gespeicherte Energie zur Steuerkreisversorgung (15) über das Steuerkreisventil (14) genutzt wird.2. A method of operating a hydraulic press according to claim 1, characterized in that the energy stored in the hydraulic accumulator ( 10 ) is used for the control circuit supply ( 15 ) via the control circuit valve ( 14 ). 3. Verfahren zum Betreiben einer hydraulischen Presse nach den Ansprüchen 1 und 2, dadurch gekennzeichnet, daß die Antriebseinehit als Differentialschaltung beim Hochfahren des Pressenstößels (1) durch Druckbeaufschlagung im Kolbenraum (3) das Ölvolumen aus dem Ringraum (4) über das Schaltventil (21) in den Kolbenraum (3) zurückgeführt wird.3. A method for operating a hydraulic press according to claims 1 and 2, characterized in that the drive unit as a differential circuit when the press ram is raised ( 1 ) by pressurizing the piston chamber ( 3 ), the oil volume from the annular space ( 4 ) via the switching valve ( 21 ) is returned to the piston chamber ( 3 ). 4. Verfahren zum Betreiben einer hydraulischen Presse nach den Ansprüchen 1 und 2, dadurch gekennzeichnet, daß die Antriebseinheit als Differentialschaltung beim Schließvorgang das Hydrauliköl aus dem Kolbenraum (3) über das Schaltventil (21) in den Ringraum (4) und nur die Überschußmenge zum Hydraulikspeicher (10) überführt wird.4. A method for operating a hydraulic press according to claims 1 and 2, characterized in that the drive unit as a differential circuit during the closing process, the hydraulic oil from the piston chamber ( 3 ) via the switching valve ( 21 ) in the annular space ( 4 ) and only the excess amount Hydraulic accumulator ( 10 ) is transferred. 5. Vorrichtung zur Durchführung des Verfahrens zum Betreiben einer hydraulischen Presse zum Umformen bzw. zum Bearbeiten von Werkstücken mit einer hydraulischen Antriebseinheit, bestehend aus einer hydraulisch betätigbaren Zylinderkolbeneinheit zum Heben und Senken eines Pressenstößels, dadurch gekennzeichnet, daß der Zylinderkolbeneinheit (2, 3 und 4) durch Rohrleitungen (6) verbunden ein Sicherheitsblock (5), ein Richtungsproportionalventil (7), ein Rückschlagventil (9) und ein Niederdruck-Hydraulikspeicher (10) zugeordnet ist, aus dem über ein Freigabeventil (16) kleinere hydraulische Verbraucher (20) antreibbar sind. 5. Apparatus for carrying out the method for operating a hydraulic press for forming or processing workpieces with a hydraulic drive unit, consisting of a hydraulically actuated cylinder piston unit for lifting and lowering a press ram, characterized in that the cylinder piston unit ( 2 , 3 and 4 ) connected by pipes ( 6 ) is assigned a safety block ( 5 ), a directional proportional valve ( 7 ), a check valve ( 9 ) and a low-pressure hydraulic accumulator ( 10 ) from which smaller hydraulic consumers ( 20 ) can be driven via a release valve ( 16 ) are. 6. Vorrichtung zur Durchführung des Verfahrens zum Betreiben einer hydraulischen Presse nach Anspruchs, dadurch gekennzeichnet, daß aus dem Niederdruck-Hydraulikspeicher (10) der Steuerkreis über eine Steuerölleitung (15) und ein Steuerölventil (14) energetisch beaufschlagbar ist.6. Device for performing the method for operating a hydraulic press according to claim, characterized in that from the low-pressure hydraulic accumulator ( 10 ) the control circuit via a control oil line ( 15 ) and a control oil valve ( 14 ) can be energized.
DE19528558A 1995-08-03 1995-08-03 Method for operating a hydraulic press and apparatus for carrying out the method Expired - Fee Related DE19528558B4 (en)

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DE10006013A1 (en) * 2000-02-11 2001-08-23 Hydac Technology Gmbh Device for saving energy in hydraulically actuated work equipment
DE10053586A1 (en) * 2000-10-25 2002-05-02 Volkswagen Ag Pressure generator for hydraulic systems in motor vehicles has hydraulic pump and parallel valve opened/closed by pressure measuring device, dependent upon pressure
US6691545B1 (en) 1999-06-21 2004-02-17 Hydraulico A/S Tool and a method for pressure shaping
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CN102364120A (en) * 2011-06-30 2012-02-29 天津市天锻压力机有限公司 Hydraulic control system for piston type energy accumulator
US20150158262A1 (en) * 2012-05-10 2015-06-11 Dieffenbacher GmbH Maschinen-und Anlagenbau Method and device for adaptively controlling a hydraulic press
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US6691545B1 (en) 1999-06-21 2004-02-17 Hydraulico A/S Tool and a method for pressure shaping
DE10006013A1 (en) * 2000-02-11 2001-08-23 Hydac Technology Gmbh Device for saving energy in hydraulically actuated work equipment
DE10053586A1 (en) * 2000-10-25 2002-05-02 Volkswagen Ag Pressure generator for hydraulic systems in motor vehicles has hydraulic pump and parallel valve opened/closed by pressure measuring device, dependent upon pressure
CN100457320C (en) * 2007-02-13 2009-02-04 西南铝业（集团）有限责任公司 Controlling system of moulded forging hydraulic press with proportional type oil controlling water
CN102364120A (en) * 2011-06-30 2012-02-29 天津市天锻压力机有限公司 Hydraulic control system for piston type energy accumulator
US20150158262A1 (en) * 2012-05-10 2015-06-11 Dieffenbacher GmbH Maschinen-und Anlagenbau Method and device for adaptively controlling a hydraulic press
CN105221497A (en) * 2015-10-27 2016-01-06 天津市天锻压力机有限公司 High speed pre-shaping hydraulic press hydraulic control system
CN105221497B (en) * 2015-10-27 2017-07-14 天津市天锻压力机有限公司 High speed preformation type hydraulic machine hydraulic control system
CN106593974A (en) * 2016-12-12 2017-04-26 天津商企生产力促进有限公司 Electromechanical machining mechanism with returning pressure stabilizing function
CN106593973A (en) * 2016-12-12 2017-04-26 天津商企生产力促进有限公司 Electromechanical processing mechanism
CN114165487A (en) * 2021-12-16 2022-03-11 合肥合锻智能制造股份有限公司 Hydraulic control system for composite material
CN114165487B (en) * 2021-12-16 2024-01-30 合肥合锻智能制造股份有限公司 Hydraulic control system of composite material

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