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EP0972631A1 - Entraínement hydraulique pour une presse - Google Patents

Entraínement hydraulique pour une presse Download PDF

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Publication number
EP0972631A1
EP0972631A1 EP99111751A EP99111751A EP0972631A1 EP 0972631 A1 EP0972631 A1 EP 0972631A1 EP 99111751 A EP99111751 A EP 99111751A EP 99111751 A EP99111751 A EP 99111751A EP 0972631 A1 EP0972631 A1 EP 0972631A1
Authority
EP
European Patent Office
Prior art keywords
hydraulic
pump
press
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.)
Granted
Application number
EP99111751A
Other languages
German (de)
English (en)
Other versions
EP0972631B1 (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
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 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 Work 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.
  • the longitudinal and / or Cross movements as well as possible lifting movements of the Transport device for the workpiece transport from Main drive derived and are thus with the plunger movement synchronized.
  • Step or transfer presses or GT presses related to the Forming path within the stage and related to the Transport process between the steps is geometrically defined.
  • 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.
  • Have mechanical presses high efficiency and can with high stroke rate are operated because the flywheel only uses so much energy is taken as this is the press movement and the Operation required.
  • 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 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 travel is constant or must be controllable depending on the process and also where a large forming path is required.
  • a hydraulic press Storage drive Different from such a direct pump drive is the drive of a hydraulic press Storage drive.
  • 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 into a high-pressure accumulator, from which then the working cylinder via a proportional valve or Servo valve is fed with nominal pressure. Therefore, when direct 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.
  • Working ability 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.
  • 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 without any problems Production operations can be changed.
  • the so-called “hydraulic transformer” by an arrangement of several hydraulic devices adjustable by swivel angle formed in principle as so-called. Hydro engines and Hydro pumps are known.
  • Hydro engines and Hydro pumps are known.
  • a corresponding arrangement of swivel angle adjustable Hydraulic devices for driving a Cylinder-piston unit is shown.
  • a hydraulic press can be used by any 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.
  • By connecting the hydraulic Transformer efficiency will be 60 - 75% increased, whereby 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 forming process on the workpiece.
  • the cylinder-piston unit 2 has a working cylinder 3, inside 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 on the maximum pressure required, being a Control block 10, the line sections 11, 12 between Pump arrangement 9 and high pressure accumulator 8 connects.
  • 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 Control block 10 To operate the cylinder-piston unit, the Control block 10 a proportional valve arrangement, so that the hydraulic medium from the high pressure accumulator 8 with 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. At the same time it will Hydraulic medium from the annular cylinder space 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. As a result, 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 Pump motor device 37 that can be swiveled through an angle 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 indicates 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 absorption 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 closes the hydraulic transformer switches off. In the illustration shown is the passage 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 therefore 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)
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 true EP0972631A1 (fr) 2000-01-19
EP0972631B1 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)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011021986A1 (fr) * 2009-08-18 2011-02-24 Demirer Teknolojik Sistemler Sanayi Ticaret Limited Sirketi Économie d’énergie dans des presses hydrauliques à cintrer
AT516316B1 (de) * 2014-09-29 2017-11-15 Bosch Gmbh Robert Verfahren zur Steuerung einer hydraulisch angetriebenen Maschine
AT515369B1 (de) * 2014-02-14 2018-03-15 Thomas Dr Loecher Anordnung zur Regelung eines hydraulischen Antriebselements

Families Citing this family (17)

* 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
AU2001278651A1 (en) * 2000-09-20 2002-04-02 Laeis Bucher 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
DE102011000473B4 (de) * 2011-02-02 2017-07-13 Langenstein & Schemann Gmbh Pressmaschine und Verfahren zum Pressen von Werkstücken
EP2742186A2 (fr) 2011-08-12 2014-06-18 Eaton Corporation Procédé et appareil pour récupérer l'énergie inertielle
EP2742185B1 (fr) 2011-08-12 2018-02-21 Eaton Corporation Système et procédé pour récupérer de l'énergie et égaliser des charges de système hydraulique
JP5934543B2 (ja) * 2012-03-29 2016-06-15 Ｋｙｂ株式会社 流体圧駆動ユニット
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
JP6320417B2 (ja) 2012-12-19 2018-05-09 イートン コーポレーションＥａｔｏｎ Ｃｏｒｐｏｒａｔｉｏｎ エネルギを回収し、油圧システムにかかる負荷を平準化するための油圧システム用制御システム及び方法
IT201800007019A1 (it) * 2018-07-09 2020-01-09 Impianto fluidodinamico per l'azionamento controllato della slitta di una pressa

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4707988A (en) * 1983-02-03 1987-11-24 Palmers Goeran Device in hydraulically driven machines
EP0311779A2 (fr) * 1987-10-10 1989-04-19 Robert Bosch Gmbh Dispositif de commande hydraulique pour une presse
DE4429782A1 (de) * 1993-09-02 1995-03-09 Mueller Weingarten Maschf Verfahren zur Regelung des Antriebs einer hydraulischen Presse und Vorrichtung zur Durchführung des Verfahrens
US5460084A (en) * 1993-03-16 1995-10-24 Maschinenfabrik Mueller-Weingarten Ag Method for controlling the drive of a hydraulic press
EP0692327A1 (fr) * 1994-07-01 1996-01-17 Maschinenfabrik Müller-Weingarten Ag Entraînement pour presses hydrauliques à grand nombre de cycles
DE4436666A1 (de) * 1994-10-13 1996-04-18 Rexroth Mannesmann Gmbh Hydraulisches Antriebssystem für eine Presse

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
PL94143B1 (fr) * 1974-11-23 1977-07-30
JP3795112B2 (ja) * 1995-10-25 2006-07-12 川崎油工株式会社 油圧プレスの金型成形トライアル油圧制御方法

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4707988A (en) * 1983-02-03 1987-11-24 Palmers Goeran Device in hydraulically driven machines
EP0311779A2 (fr) * 1987-10-10 1989-04-19 Robert Bosch Gmbh Dispositif de commande hydraulique pour une presse
US5460084A (en) * 1993-03-16 1995-10-24 Maschinenfabrik Mueller-Weingarten Ag Method for controlling the drive of a hydraulic press
DE4429782A1 (de) * 1993-09-02 1995-03-09 Mueller Weingarten Maschf Verfahren zur Regelung des Antriebs einer hydraulischen Presse und Vorrichtung zur Durchführung des Verfahrens
EP0692327A1 (fr) * 1994-07-01 1996-01-17 Maschinenfabrik Müller-Weingarten Ag Entraînement pour presses hydrauliques à grand nombre de cycles
DE4436666A1 (de) * 1994-10-13 1996-04-18 Rexroth Mannesmann Gmbh Hydraulisches Antriebssystem für eine Presse

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011021986A1 (fr) * 2009-08-18 2011-02-24 Demirer Teknolojik Sistemler Sanayi Ticaret Limited Sirketi Économie d’énergie dans des presses hydrauliques à cintrer
AT515369B1 (de) * 2014-02-14 2018-03-15 Thomas Dr Loecher Anordnung zur Regelung eines hydraulischen Antriebselements
AT516316B1 (de) * 2014-09-29 2017-11-15 Bosch Gmbh Robert Verfahren zur Steuerung einer hydraulisch angetriebenen Maschine

Also Published As

Publication number Publication date
DE59904695D1 (de) 2003-04-30
US6370873B1 (en) 2002-04-16
DE19831624A1 (de) 2000-01-20
EP0972631B1 (fr) 2003-03-26

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