EP0972631B1 - Entraínement hydraulique pour une presse - Google Patents

Entraínement hydraulique pour une presse Download PDF

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Publication number
EP0972631B1
EP0972631B1 EP99111751A EP99111751A EP0972631B1 EP 0972631 B1 EP0972631 B1 EP 0972631B1 EP 99111751 A EP99111751 A EP 99111751A EP 99111751 A EP99111751 A EP 99111751A EP 0972631 B1 EP0972631 B1 EP 0972631B1
Authority
EP
European Patent Office
Prior art keywords
hydraulic
press
pump
cylinder
motor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP99111751A
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German (de)
English (en)
Other versions
EP0972631A1 (fr
Inventor
Günther Dipl.-Ing. Schaich
Joachim Dipl.-Ing. Beyer
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.)
Mueller Weingarten AG
Original Assignee
Mueller Weingarten AG
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Filing date
Publication date
Application filed by Mueller Weingarten AG filed Critical Mueller Weingarten AG
Publication of EP0972631A1 publication Critical patent/EP0972631A1/fr
Application granted granted Critical
Publication of EP0972631B1 publication Critical patent/EP0972631B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B30B15/24—Control arrangements for fluid-driven presses controlling the movement of a plurality of actuating members to maintain parallel movement of the platen or press beam
    • 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
    • B30B15/161—Control arrangements for fluid-driven presses controlling the ram speed and ram pressure, e.g. fast approach speed at low pressure, low pressing speed at high pressure
    • 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

Definitions

  • the invention relates to a hydraulic drive for a Press according to the preamble of claim 1.
  • step The workpiece is transfer pressed over several Labor operations made.
  • the shape of Upper tool and lower tool in the respective stage determines the progress of the machining process.
  • GT presses large-part step presses
  • All ram movements take place synchronized from a central main drive via a Press gear located in the head of the press.
  • Press gear located in the head of the press.
  • the movements are more such Step or transfer presses or GT presses related to the Forming path within the stage and related to the Transport process between the stages geometrically determined.
  • Such presses are e.g. B. as eccentric and crank presses designed.
  • the kinematics of the thrust crank gear determines the movement of the working ram, the respective Crank angle determines the forming force.
  • the ram speed is also in the direct connection to the crank angle and it results thus a rigid process flow.
  • Hydraulically operated presses work according to the hydrostatic principle with a uniform Pressure spread in a liquid, the pressure on a piston surface of a cylinder-piston system one for pressure proportional force generated. This allows a hydraulic driven ram at every point of the ram stroke and thus a force up to regardless of the tool position Unfold the nominal force of the press. Hydraulic presses are therefore preferred in those fields of metal forming technology where the force along the ram path is constant or must be process-related controllable and also where a large forming path is required.
  • the pump acts on the direct drive with every work process directly on the Cylinder-piston system, so promotes the pressure accumulator drive the pump first in a high-pressure accumulator, from which then the working cylinder via a proportional valve or Servo valve is fed with nominal pressure. Therefore, when immediate pump drive the pump and the drive motor to the greatest current press power requirements be designed.
  • the delivery rate of the High pressure pump is usually the ram speed infinitely adjustable.
  • the speed of the ram in the accumulator drive only indirectly from the Pump performance is affected, so that the pump performance designed an average energy requirement and thus smaller can be dimensioned.
  • the work capacity at Storage drive is then on in the high pressure storage stored energy limited.
  • A is then used to retract and optimize these tools hydraulic press used on the individual Forming stages of the GT press can be simulated.
  • Such a hydraulic Press is e.g. in JP-A-9 123 000.
  • the tool press can be used after the tool change Production without any significant interruption continue.
  • the invention is based, the Field of application of such hydraulic simulation presses to expand.
  • a hydraulic Simulation press also for pilot series or small series be suitable.
  • the efficiency should be essential be improved.
  • the invention is based on the main idea that a conventional hydraulic simulation press in terms of construction is expanded by the fact that a certain production plant for the production of pilot series or small series also with this press is possible. This is done by supplementing the conventional hydraulic press through a kind "hydraulic transformer", by means of which the Operating mode from a simulation operation into one Production operations can be changed.
  • the so-called “hydraulic transformer” by an arrangement of several swivel angle adjustable hydraulic devices formed in principle as so-called. Hydro engines and Hydro pumps are known.
  • Hydro engines and Hydro pumps are known.
  • a corresponding arrangement of adjustable swivel angle Hydraulic devices for driving a Cylinder-piston unit is shown.
  • a hydraulic press By means of such A hydraulic press can be used by one facility Simulation operation in a production facility changed become.
  • the so-called. hydraulic transformer switched off when Production operation is switched on.
  • the Ram speed can be reduced to z. B. 30 - 60 mm / sec. depending on the size of the transformer with 4 - 6 strokes / min. a higher output of Allows sharing.
  • the efficiency is reduced to 60 - 75% increased, with working strokes of approx. 150 mm at one Total stroke of approx. 700 mm can be easily adjusted.
  • the Cycle times are on the order of ⁇ 10 seconds. According to this data, zero series or Small series can be driven economically, so that a such a hydraulic press significantly expanded Intended use received. This leads to a significant increased area of application of such special presses. She can be used as a simulation press for adjustment work e.g. B. a GT press as well as a production press for Small series can be used.
  • the figure shows a basic representation of the structure and Plant schemes of the invention.
  • a press ram 1 is shown for a hydraulic press, not shown, which receives an upper tool, not shown, on its underside.
  • the up and down movement of the press ram 1 takes place hydraulically via at least one cylinder-piston unit 2 acting on the press ram 1, which serves as a lifting and working cylinder for carrying out the shaping process on the workpiece.
  • the cylinder-piston unit 2 has a working cylinder 3, in the interior of which a working piston 4 is moved up and down.
  • the working piston 4 has on its lower side a piston rod 5 which is connected to the press ram 1.
  • the effective circular cylindrical upper pressure surface F 1 on the working piston 4 is consequently determined by the diameter d 1 of the working piston 4.
  • the effective lower circular pressure surface F 2 is formed by the difference in area of the diameter d 1 of the working piston 4 minus the diameter d 2 of the piston rod 5.
  • the press according to the invention has two operating states. First, the first operating state is called “Simulation mode” explained.
  • Analogous to a conventional hydraulic simulation press is the by means of an accumulator drive Cylinder-piston unit 2 actuated.
  • a High-pressure accumulator 8 by means of a pump arrangement 9 maximum pressure required, being a Control block 10, the line sections 11, 12 between Pump arrangement 9 and high pressure accumulator 8 connects. to Charging the high pressure accumulator 8 would also be a direct one Connection (line 11 ') possible.
  • the pump assembly 9 for a storage drive usually consists of a Constant pump, zero stroke pump or a variable displacement pump.
  • a drive motor 13 for one Feed pump 14 shown the hydraulic medium from a Oil tank or tank 15 promotes.
  • the funding direction of the Constant pump 14 shown is with arrow 16 represented symbolically.
  • the includes Control block 10 a proportional valve arrangement, so that the hydraulic medium from the high pressure accumulator 8 Nominal pressure over a arranged in the control block 10 Proportional valve arrangement or servo valve (continuous valve) and via the supply line 17 with the supplementary line 18 to the upper circular cylindrical cylinder space 6 of the cylinder-piston unit to be led.
  • the control block 10 Hydraulic medium from the annular cylinder chamber 7 via a Supplementary line 19 and via line 20 to the control block 10 performed, wherein the pressure relief of the print medium the cylinder space 7 to a not shown Oil tank is done.
  • the press ram 1 in Downward direction actuated.
  • the conventional hydraulic described above Simulation press is inventively by a so-called hydraulic transformer 27 complements, as in the Figure representation with a dashed line is drawn.
  • This is a first Hydraulic device 28, which is adjustable as the swivel angle Motor pump assembly 29 is formed.
  • This arrangement is used in particular as a hydraulic motor in the direction of arrow 30 specified flow direction operated, the by the Arrow 31 shown adjustability of this hydraulic motor changed swallowing volume and thus a changed Flow allowed.
  • the speed of the hydraulic motor is determined by a speed controller 32 detects.
  • the drive for the Hydro motor 29 takes place via the high-pressure accumulator 8 and the supply line 33.
  • An oil tank 34 is used to hold the hydraulic medium flowing through the hydraulic motor 29.
  • the hydraulic device 29 acting as a hydraulic motor is a second via a mechanical coupling device 35 Associated hydraulic device 36.
  • This Hydraulic device 36 is also as Swivel angle adjustable pump motor device 37 the upper and lower double arrows 38, 39 the operation of this device as a pump or motor in occupy two flow directions.
  • the only upper double arrow 40 in the hydraulic device 29 out that this arrangement as a hydraulic motor or as Pump in only one, opposite flow direction can be actuated.
  • pressure medium drives the hydraulic motor 29 in turn by means of a targeted and controllable Setting via the clutch assembly 35 as Hydraulic pump acting device 37 drives.
  • This too Pump arrangement is in accordance with arrow 41 adjustable swivel angle so that the swallowing volume of the pump and thus the through flow through the hydraulic pump is infinitely variable.
  • the hydraulic pump 37 are a first in the entrance area Shut-off valve 42 and another in the exit area Shut-off valve 43 assigned, which the flow of Feeds pressure medium through the hydraulic transformer or prevents or the hydraulic transformer closed or off.
  • the passage is in the illustration shown drawn blocked by these valves.
  • shut-off valve 44 is a so-called hydraulic connector between the high pressure accumulator 8 and of the first hydraulic device 28.
  • the hydraulic transformer 27 consequently enables one Supplement to the press explained for simulation mode Implementation of a production operation, with a targeted Regulation or control of the pressure curve via the two Hydraulic devices 28, 36 is made possible.
  • the special one lies in the interaction of the conventional ones hydraulic press arrangement with the loading of the Cylinder-piston unit 2 over the medium of the Pressure fluid storage 8 and the additional use of a so-called hydraulic transformer 27.

Landscapes

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

Claims (8)

  1. Entraínement hydraulique pour une presse, en particulier pour une presse pour la simulation des conditions de fonctionnement de presses de transfert ou de presses à étages mécaniques ou de presses à étages pour de grandes pièces (presses GT), comportant au moins un vérin (2) pouvant être alimenté des deux côtés, comportant un entraínement d'accumulateur de pression (8, 9) ayant un accumulateur à haute pression (8) et une unité de motopompe (9) pour un coulisseau de presse (1), l'accumulateur à haute pression (8) étant chargé, au moyen de l'unité de motopompe (9), à la pression nominale maximale et le vérin (2) pouvant être actionné par du fluide hydraulique dans un fonctionnement de simulation via des valves proportionnelles dans un bloc de commande (10) au moyen de la pression accumulée,
    caractérisé en ce que, pour faire passer la presse d'un « fonctionnement de simulation » à vitesse de coulisseau élevée et faible nombre de courses à un « fonctionnement de production » à vitesse de coulisseau plus faible et à nombre de courses plus élevé, un transformateur hydraulique (27) est associé à l'entraínement d'accumulateur de pression (8, 9) pour le vérin (2), comportant un premier dispositif hydraulique (28), qui est réalisé comme moteur hydraulique (29) dont l'angle de pivotement est réglable, et un second dispositif hydraulique (36) relié mécaniquement à celui-ci, qui est réalisé comme pompe hydraulique dont l'angle de pivotement est réglable, l'accumulateur à haute pression (8) de l'entraínement d'accumulateur de pression (8, 9) pour le fonctionnement de simulation servant de la même façon pour l'entraínement du premier dispositif hydraulique (28) dans le fonctionnement de production.
  2. Entraínement selon la revendication 1,
    caractérisé en ce que, dans le fonctionnement de simulation, l'accumulateur à haute pression (8) est chargé par l'intermédiaire du bloc de commande (10) au moyen d'un agencement de motopompe (9) et, par l'intermédiaire du bloc de commande (10), le vérin (2) peut être actionné.
  3. Entraínement selon la revendication 2,
    caractérisé en ce que le bloc de commande (10) sert pour la commande ou le réglage des états de travail du vérin (2) dans le fonctionnement de simulation, des plages de vitesses du coulisseau de presse (1) jusqu'à 500 mm/s pour 1 - 2 courses/mn pouvant être réglées.
  4. Entraínement selon une des revendications précitées,
    caractérisé en ce que l'alimentation en pression ou la décharge de pression des espaces de cylindre (6, 7) du vérin (2) est effectuée par l'intermédiaire de servovalves, de valves à action progressive ou d'une commande à valve proportionnelle dans le bloc de commande (10).
  5. Entraínement selon la revendication 1,
    caractérisé en ce que le fonctionnement de production est mis en oeuvre par une mise en service d'un transformateur hydraulique (27) pour l'agencement de presse après le fonctionnement de simulation, l'espace de cylindre supérieur (6) et l'espace de cylindre inférieur (7) du vérin (2) étant reliés par l'intermédiaire d'au moins un agencement de valve d'arrêt (42, 43) et d'un agencement de moteur hydraulique/pompe hydraulique (36, 37) dont l'angle de pivotement est réglable.
  6. Entraínement selon la revendication 5,
    caractérisé en ce que le dispositif hydraulique (36) est réalisé comme agencement de pompe/moteur, la pompe ou le moteur travaillant, à chaque fois, dans deux sens d'écoulement.
  7. Entraínement selon une des revendications précitées,
    caractérisé en ce que le dispositif hydraulique (28) est réalisé comme agencement de pompe/moteur dont l'angle de pivotement est réglable, la pompe travaillant dans un sens d'écoulement et le moteur travaillant dans le sens d'écoulement opposé.
  8. Entraínement selon une des revendications précitées,
    caractérisé en ce qu'un capteur de vitesse de rotation (32) est associé au dispositif hydraulique (28).
EP99111751A 1998-07-15 1999-06-18 Entraínement hydraulique pour une presse Expired - Lifetime EP0972631B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19831624 1998-07-15
DE19831624A DE19831624A1 (de) 1998-07-15 1998-07-15 Hydraulischer Antrieb für eine Presse

Publications (2)

Publication Number Publication Date
EP0972631A1 EP0972631A1 (fr) 2000-01-19
EP0972631B1 true EP0972631B1 (fr) 2003-03-26

Family

ID=7874057

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99111751A Expired - Lifetime EP0972631B1 (fr) 1998-07-15 1999-06-18 Entraínement hydraulique pour une presse

Country Status (3)

Country Link
US (1) US6370873B1 (fr)
EP (1) EP0972631B1 (fr)
DE (2) DE19831624A1 (fr)

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000136806A (ja) * 1998-11-04 2000-05-16 Komatsu Ltd 圧油のエネルギー回収装置および圧油のエネルギー回収・再生装置
US6973780B2 (en) * 2000-09-20 2005-12-13 Laeis Gmbh Controller for a hydraulic press and method for the operation thereof
DE10250207A1 (de) * 2002-10-28 2004-05-13 Bosch Rexroth Ag Dämpfungsvorrichtung
US6854268B2 (en) * 2002-12-06 2005-02-15 Caterpillar Inc Hydraulic control system with energy recovery
ES2237279B1 (es) * 2003-04-11 2006-11-01 Onapres, S. Coop. Prensa hidraulica de pruebas de alta velocidad para emulacion de prensas mecanicas.
US7409826B2 (en) * 2005-08-30 2008-08-12 Grigoriy Epshteyn Compact hydrostatic energy recuperation system and method of operation
US7775040B2 (en) * 2006-11-08 2010-08-17 Caterpillar Inc Bidirectional hydraulic transformer
US20080155975A1 (en) * 2006-12-28 2008-07-03 Caterpillar Inc. Hydraulic system with energy recovery
US8739950B2 (en) * 2008-09-25 2014-06-03 Gm Global Technology Operations, Llc Auxiliary pump system for hybrid powertrains
GB2472593B (en) * 2009-08-11 2012-10-24 Mactaggart Scott Energy converter device
TR200906352A2 (tr) * 2009-08-18 2010-12-21 Demi̇rer Teknoloji̇k Si̇stemler Sanayi̇ Ti̇caret Li̇mi̇ted Şi̇rketi̇ Hidrolik abkant preslerde enerji tasarrufu sağlayan bir yapılanma.
DE102011000473B4 (de) * 2011-02-02 2017-07-13 Langenstein & Schemann Gmbh Pressmaschine und Verfahren zum Pressen von Werkstücken
CN103732835B (zh) 2011-08-12 2017-09-12 伊顿公司 用于回收能量和平衡液压系统负载的系统和方法
WO2013025416A2 (fr) 2011-08-12 2013-02-21 Eaton Corporation Procédé et appareil pour récupérer l'énergie inertielle
JP5767996B2 (ja) * 2012-03-29 2015-08-26 カヤバ工業株式会社 流体圧駆動ユニット
JP5934543B2 (ja) * 2012-03-29 2016-06-15 Ｋｙｂ株式会社 流体圧駆動ユニット
WO2014099926A1 (fr) 2012-12-19 2014-06-26 Eaton Corporation Système de commande pour système hydraulique et procédé de récupération d'énergie et de mise à niveau de charges de système hydraulique
DE102014202766B4 (de) * 2014-02-14 2023-04-27 Thomas Löcher Anordnung zur Regelung eines hydraulischen Antriebselements
DE102014226236A1 (de) * 2014-09-29 2016-03-31 Robert Bosch Gmbh Hydraulische Schaltung und Maschine mit einer hydraulischen Schaltung
IT201800007019A1 (it) * 2018-07-09 2020-01-09 Impianto fluidodinamico per l'azionamento controllato della slitta di una pressa

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09123000A (ja) * 1995-10-25 1997-05-13 Kawasaki Yukou Kk 油圧プレスの金型成形トライアル油圧制御方法

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PL94143B1 (fr) * 1974-11-23 1977-07-30
SE437861B (sv) * 1983-02-03 1985-03-18 Goran Palmers Anordning vid medelst hydraul-cylinder drivna maskiner med en av en drivkella via en energiackumulatordriven pump
DE3734329A1 (de) * 1987-10-10 1989-04-20 Bosch Gmbh Robert Hydraulische steuereinrichtung fuer eine presse
DE4308344A1 (de) * 1993-03-16 1994-09-22 Mueller Weingarten Maschf Verfahren zur Regelung des Antriebs einer hydraulischen Presse und Vorrichtung zur Durchführung des Verfahrens
EP0641644A1 (fr) * 1993-09-02 1995-03-08 Maschinenfabrik Müller-Weingarten AG Procédé de commande d'entraînement d'une presse hydraulique et dispositif pour la mise en oeuvre du procédé
DE19524042A1 (de) * 1994-07-01 1996-03-21 Mueller Weingarten Maschf Antrieb für hydraulische Pressen mit hoher Hubzahl
DE4436666A1 (de) * 1994-10-13 1996-04-18 Rexroth Mannesmann Gmbh Hydraulisches Antriebssystem für eine Presse

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09123000A (ja) * 1995-10-25 1997-05-13 Kawasaki Yukou Kk 油圧プレスの金型成形トライアル油圧制御方法

Also Published As

Publication number Publication date
EP0972631A1 (fr) 2000-01-19
DE19831624A1 (de) 2000-01-20
DE59904695D1 (de) 2003-04-30
US6370873B1 (en) 2002-04-16

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