EP0703018A1 - Presse mécanique ou hydraulique - Google Patents

Presse mécanique ou hydraulique Download PDF

Info

Publication number
EP0703018A1
EP0703018A1 EP95113596A EP95113596A EP0703018A1 EP 0703018 A1 EP0703018 A1 EP 0703018A1 EP 95113596 A EP95113596 A EP 95113596A EP 95113596 A EP95113596 A EP 95113596A EP 0703018 A1 EP0703018 A1 EP 0703018A1
Authority
EP
European Patent Office
Prior art keywords
pressure
press
cheek
superimposed
workpiece
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
EP95113596A
Other languages
German (de)
English (en)
Other versions
EP0703018B1 (fr
Inventor
Erich Harsch
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
Maschinenfabrik Mueller Weingarten AG
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 Maschinenfabrik Mueller Weingarten AG, Mueller Weingarten AG filed Critical Maschinenfabrik Mueller Weingarten AG
Publication of EP0703018A1 publication Critical patent/EP0703018A1/fr
Application granted granted Critical
Publication of EP0703018B1 publication Critical patent/EP0703018B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D35/00—Combined processes according to or processes combined with methods covered by groups B21D1/00 - B21D31/00
    • B21D35/002—Processes combined with methods covered by groups B21D1/00 - B21D31/00
    • B21D35/008—Processes combined with methods covered by groups B21D1/00 - B21D31/00 involving vibration, e.g. ultrasonic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D24/00—Special deep-drawing arrangements in, or in connection with, presses
    • B21D24/10—Devices controlling or operating blank holders independently, or in conjunction with dies
    • B21D24/14—Devices controlling or operating blank holders independently, or in conjunction with dies pneumatically or hydraulically

Definitions

  • the invention relates to a mechanical or hydraulic press according to the preamble of claim 1.
  • proportional or servo valves are used to control or regulate the pressures in the sheet metal holder sets and thus to regulate the sheet metal holding force, the sheet metal holding cylinder being assigned a sensor which, via a control device, the desired pressure change in the sheet metal holding cylinder depending on the respective drawing step by means of proportional or servo valves.
  • a single-acting drawing press has become known from DE-32 42 705 C2, in which the pressure cheek arranged in the press table can be acted upon by several piston / cylinder units with locally different cushioning forces, in order in particular to be able to machine asymmetrical large drawing parts with locally different desired forces.
  • a different drawing capacity in the respective areas of a workpiece can be achieved by deliberately changing the drawing gap.
  • different pressures can be generated for the sheet metal holder. Accordingly, there is a force regulation for a differentiated support of the pressure cheek, which transmits the different force to the sheet metal holding device or the workpiece.
  • a press to be used for drawing and deep drawing operations has also become known, which is also designed as a single-acting press and whose hydraulically supported pressure cheek acts on the lower part of the tool or the drawing punch.
  • the drawing process on the drawing punch can be influenced in the sense of a sheet metal deformation by specifically influencing the pressure on the pressure cheek.
  • the sheet metal to be processed must therefore not only be influenced by a sheet metal holder or sheet hold-down device surrounding the drawing die. Rather, the flow of the sheet on the lower part of the tool or on the drawing die itself can be controlled by means of a targeted pressure regulation via the pressure cheek.
  • This arrangement may work satisfactorily for the application of force to a sheet metal plunger and for simply shaped parts. However, it cannot be used with complicated parts and in particular with single-acting presses, since a targeted regulation of the sheet metal holding forces via a pressure cheek is required here.
  • the invention is based on the object of achieving a further improvement in the working method, in particular of a single-acting press, with an optimal flow behavior of the workpiece also taking place in the tool itself.
  • the present invention is based on the main idea that an optimal flow behavior of the workpiece can be achieved, in particular in a single-acting press, in that the pressure cheek arranged in the press table is acted upon by a pressure control for generating a targeted pressure profile during the forming process, which is additionally superimposed on a specific pressure oscillation , wherein a constant change of the force application between a maximum and a minimum value is generated such that the workpieces are continuously loaded and unloaded.
  • This makes the flow behavior similar to that of the named EP 0 438 747, positively influenced, whereby the flow behavior of the workpiece can be influenced both by means of a sheet metal holder and in the forming tool itself.
  • the sheet metal holder or hold-down device surrounding the lower tool can be subjected to a certain predetermined constant or controllable workpiece holding force via the pressure cheek in order to fix the sheet metal, for example, during a deep-drawing process.
  • a superimposed pulsating pressure fluctuation can be imposed on this base load on the sheet metal holder, which enables constant loading and unloading.
  • a given pressure control is therefore provided with a superimposed pressure oscillation.
  • the pressure cheek acting on the lower tool can equally be used with a predetermined pressure profile d. H. a workpiece holding pressure, which in turn is superimposed by a pressure vibration.
  • a pressure profile d H. a workpiece holding pressure, which in turn is superimposed by a pressure vibration.
  • a pressure oscillation can be superimposed on a workpiece holding pressure acting as a base load by separate pistons / cylinder units which are assigned to the respective pressure cheek and which in particular interact with the pistons / cylinder units to generate the base load.
  • Suitable pressure oscillation frequencies are selected which generate constant loading and unloading of the workpiece to be machined in such a way that the deformation process is optimized.
  • the press 1 shown in FIG. 1 shows only the lower part of such a press.
  • a movable sliding table 3 On a stationary press table 2, a movable sliding table 3 is attached, which serves to support a lower tool, not shown.
  • a one-part or multi-part pressure cheek 4 - also called pressure cushion or die cushion - which is pressurized by piston-cylinder units 5, 6 from below.
  • the piston / cylinder units 5, 6 are anchored stationary in the press table 2 and can also consist of a central unit.
  • the respective piston rod 7 of each piston / cylinder unit 5, 6 engages under the pressure cheek 4 in a symmetrical arrangement with respect to the symmetry center line 8 or in the symmetry center line 8.
  • the pressurization of the piston / cylinder units 5, 6 takes place via control valves 9, 10, which are designed as proportional valves or servo valves.
  • the piston / cylinder units 5, 6 with pressure medium are supplied via the supply lines 11, 12 supplied, wherein a common pressure connection line 13 is provided.
  • a hydraulic medium is preferably used as the pressure medium.
  • the proportional valves 9, 10 are regulated by a control which is only shown schematically, which is designated 14 in the proportional valve 10 and is only shown symbolically.
  • a control curve 16 which is shown as an example in the p / t diagram 15 (FIG. 2b).
  • This control curve 16 represents a kind of "base load", i. H. an output force that the piston / cylinder units 5, 6 exert on the pressure cheek 4, respectively.
  • Each of the piston / cylinder units 5, 6 can be equipped with an individual base load or control curve 16 depending on the nature of the workpiece and the forming conditions.
  • the design of the piston / cylinder units 5, 6 can also be designed in accordance with the exemplary embodiment according to DE 32 42 705 C2. Reference is hereby expressly made to the versions of the corresponding compressed air device there.
  • the press according to the invention has an equal number of piston / cylinder units 17, 18, which are integrated between the pressure cheek 4 and the piston rod 7 of the respective piston / cylinder unit 5, 6.
  • These piston / cylinder units each have a piston 19 which can be acted on from both sides and which is firmly clamped in a hydraulic medium by an upper cylinder chamber 20 and a lower cylinder chamber 21.
  • the piston Via the hydraulic feed lines 22, 23, the piston, which can be acted upon on both sides, is supplied with pressure medium in such a way that it carries out an upward and downward pressure oscillation.
  • the control unit 24, the one can apply predetermined pressurization to the piston 19 by alternating pressurization of the pressure chambers 20, 21.
  • diagram 25 FIG.
  • an oscillation profile 26 is generated, which is superimposed on the base load from the piston-cylinder units 5, 6 (FIG. 2c).
  • a basic load 16 is shown in diagram 25 (FIG. 2c), for example, which is superimposed on a harmonic 26 between a maximum value 27 and a minimum value 28.
  • the piston 29 of the piston-cylinder unit 17, 18 moves up and down periodically and thus exerts an alternating pressure on the pressure cheek 4.
  • the pressure cheek is coupled to the workpiece via a certain number of pressure bolts 30 introduced in a manner known per se.
  • a superimposed pressure vibration can also be applied directly via the proportional valves 9, 10.
  • the proportional valves have to be provided with a valve control which generates a base load 16 and a superimposed oscillating load 26.
  • the pressure system shown in FIGS. 1 and 2 for acting on the lower tool can equally be transferred to the upper tool of the press.
  • Hydraulically preloaded pressure points are located between the press drive and the ram for power transmission and overload protection.
  • the oscillating pressure of a single tool can be superimposed on the hydraulic pressure of this system, which generates a constant pulsation of the upper tool in order to create a constant relief and load on the workpiece.
  • the pulsating pressure fluctuation is determined experimentally in terms of its pressure level and alternating frequency depending on the nature of the workpiece, the alternating frequency being in the order of magnitude of approximately 10 to 40 Hz. Similar relationships are shown for another machine arrangement in EP 0 438 774, already cited.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Presses (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Press Drives And Press Lines (AREA)
EP95113596A 1994-09-26 1995-08-30 Presse mécanique ou hydraulique Expired - Lifetime EP0703018B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4434419A DE4434419A1 (de) 1994-09-26 1994-09-26 Mechanische und hydraulische Pressen
DE4434419 1994-09-26

Publications (2)

Publication Number Publication Date
EP0703018A1 true EP0703018A1 (fr) 1996-03-27
EP0703018B1 EP0703018B1 (fr) 1998-06-17

Family

ID=6529262

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95113596A Expired - Lifetime EP0703018B1 (fr) 1994-09-26 1995-08-30 Presse mécanique ou hydraulique

Country Status (3)

Country Link
EP (1) EP0703018B1 (fr)
DE (2) DE4434419A1 (fr)
ES (1) ES2118482T3 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0768127A2 (fr) * 1995-10-14 1997-04-16 SCHULER PRESSEN GmbH & Co. Dispositif d'étirage pour une presse
NL1021738C2 (nl) * 2002-10-24 2004-04-27 Tno Werkwijze en inrichting voor het reduceren van plooivorming bij dieptrekken.
EP1593443A1 (fr) * 2004-05-07 2005-11-09 Walter, Neff GmbH Presse de formage
CN110640018A (zh) * 2019-08-13 2020-01-03 安庆师范大学 一种多物理场复合效应微成形装置及方法
US11235369B2 (en) * 2014-12-09 2022-02-01 Honda Motor Co., Ltd. Draw press die assembly and method of using the same

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10344941B4 (de) * 2003-09-27 2006-09-28 Wilhelm Karmann Gmbh Vorrichtung zum Steuern einer Werkstückhaltekraft einer Presse zum Tiefziehen von Werkstücken
DE102006019502B3 (de) * 2006-04-26 2007-10-18 Moog Gmbh Verfahren zum Umformen von Blechen mit stochastischem Pulsationsmuster
DE102006043643B3 (de) * 2006-09-18 2008-04-03 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Verfahren zum Tiefziehen

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3242705C2 (de) 1982-11-19 1985-10-31 Maschinenfabrik Müller-Weingarten AG, 7987 Weingarten Im Pressentisch einer einfach wirkenden Ziehpresse angeordnete Drucklufteinrichtung
EP0173184B1 (fr) 1984-08-24 1988-11-02 August Läpple GmbH & Co. Presse à utiliser notamment pour des opérations d'étirage et d'emboutissage
DE3640507C2 (fr) 1986-11-27 1988-12-08 Maschinenfabrik Mueller-Weingarten Ag, 7987 Weingarten, De
EP0438774A1 (fr) * 1990-01-24 1991-07-31 FIAT AUTO S.p.A. Procédé d'emboutissage de tôle et presse hydraulique pour la mise en oeuvre de ce procédé
EP0438747A1 (fr) 1989-12-22 1991-07-31 SHIONOGI SEIYAKU KABUSHIKI KAISHA trading under the name of SHIONOGI & CO. LTD. Composition stable d'antibiotiques glycopeptidiques
DE4038864A1 (de) * 1989-12-05 1991-09-19 Forschungszentrum Fuer Umform Verfahren zur erhoehung des grenztiefziehverhaeltnisses
FR2671501A1 (fr) * 1991-01-14 1992-07-17 Erfurt Umformtechnik Gmbh Dispositif pour serrer des toles dans des presses a simple effet.

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3242705C2 (de) 1982-11-19 1985-10-31 Maschinenfabrik Müller-Weingarten AG, 7987 Weingarten Im Pressentisch einer einfach wirkenden Ziehpresse angeordnete Drucklufteinrichtung
EP0173184B1 (fr) 1984-08-24 1988-11-02 August Läpple GmbH & Co. Presse à utiliser notamment pour des opérations d'étirage et d'emboutissage
DE3640507C2 (fr) 1986-11-27 1988-12-08 Maschinenfabrik Mueller-Weingarten Ag, 7987 Weingarten, De
DE4038864A1 (de) * 1989-12-05 1991-09-19 Forschungszentrum Fuer Umform Verfahren zur erhoehung des grenztiefziehverhaeltnisses
EP0438747A1 (fr) 1989-12-22 1991-07-31 SHIONOGI SEIYAKU KABUSHIKI KAISHA trading under the name of SHIONOGI & CO. LTD. Composition stable d'antibiotiques glycopeptidiques
EP0438774A1 (fr) * 1990-01-24 1991-07-31 FIAT AUTO S.p.A. Procédé d'emboutissage de tôle et presse hydraulique pour la mise en oeuvre de ce procédé
EP0438774B1 (fr) 1990-01-24 1994-04-13 FIAT AUTO S.p.A. Procédé d'emboutissage de tôle et presse hydraulique pour la mise en oeuvre de ce procédé
FR2671501A1 (fr) * 1991-01-14 1992-07-17 Erfurt Umformtechnik Gmbh Dispositif pour serrer des toles dans des presses a simple effet.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
BLECH ROHRE PROFILE, vol. 39, no. 1, 1992, pages 44 - 48

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0768127A2 (fr) * 1995-10-14 1997-04-16 SCHULER PRESSEN GmbH & Co. Dispositif d'étirage pour une presse
EP0768127A3 (fr) * 1995-10-14 1997-04-23 SCHULER PRESSEN GmbH & Co. Dispositif d'étirage pour une presse
US5746084A (en) * 1995-10-14 1998-05-05 Schuler Pressen Gmbh & Co. Drawing mechanism for a press
NL1021738C2 (nl) * 2002-10-24 2004-04-27 Tno Werkwijze en inrichting voor het reduceren van plooivorming bij dieptrekken.
WO2004037460A1 (fr) * 2002-10-24 2004-05-06 Nederlandse Organisatie Voor Toegepast-Natuurwe Tenschappelijk Onderzoek Tno Procede et appareil pour reduire la formation de plis dans une operation d'emboutissage profond
EP1593443A1 (fr) * 2004-05-07 2005-11-09 Walter, Neff GmbH Presse de formage
US11235369B2 (en) * 2014-12-09 2022-02-01 Honda Motor Co., Ltd. Draw press die assembly and method of using the same
CN110640018A (zh) * 2019-08-13 2020-01-03 安庆师范大学 一种多物理场复合效应微成形装置及方法

Also Published As

Publication number Publication date
ES2118482T3 (es) 1998-09-16
EP0703018B1 (fr) 1998-06-17
DE4434419A1 (de) 1996-03-28
DE59502573D1 (de) 1998-07-23

Similar Documents

Publication Publication Date Title
EP0453955B1 (fr) Dispositif pour emboutir des pièces de tôle dans une presse
EP0972631B1 (fr) Entraínement hydraulique pour une presse
EP2183096A1 (fr) Système d'entraînement pour presses hydrauliques
DE3330936C2 (de) Presse mit einem vertikal beweglichen Pressenschlitten für die Durchführung mehrerer Arbeitsvorgänge - beispielsweise Ziehen und Abgraten - während eines Schlittenhubs an einem plattenartigen Werkstück
EP0703018B1 (fr) Presse mécanique ou hydraulique
DE4143683B4 (de) Hydroelastische Tiefzieheinrichtung
EP1063028B2 (fr) Presse pour hydroformage extérieur
DD298484A5 (de) Hydraulischer blechhalter fuer einfachwirkende pressen
EP0629455B1 (fr) Entraînement principal pour press à refouler
EP1252010B1 (fr) Presse
EP0192115A2 (fr) Appareil d'étirage pour presses
EP0370956B1 (fr) Procédé et dispositif de pliage de pièces en tôle
EP0417754B1 (fr) Presse mécanique ou hydraulique avec dispositif d'étirage ou d'emboutissage pour presse à plusieurs étapes
EP1799372B1 (fr) Procede et dispositif pour la fabrication et/ou l'usinage de pieces
WO2005021253A2 (fr) Presse hydraulique
DE102006010648A1 (de) Ziehkissen-Vorrichtung mit NC-Antrieb und hydraulischem Polster
DE102004035590A1 (de) Presse mit verriegeltem Stößel
WO2006094485A1 (fr) Ensemble coussin d'emboutissage a entrainement par commande numerique et a coussin hydraulique
DE4036470A1 (de) Ueberlastsicherung fuer eine mechanisch angetriebene presse
DE10215003A1 (de) Hydraulische Presse
DE102004006126A1 (de) Presse mit verriegeltem Stößel
DE3233860A1 (de) Einrichtung zur parallelhaltung des stoessels an hydraulischen stanzpressen
DE10249809A1 (de) Presse
DE10125078B4 (de) Hydraulische Zieheinrichtung
EP1344585B1 (fr) Dispositif d'emboutissage profond hydroélastique

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE ES FR IT

17P Request for examination filed

Effective date: 19960627

17Q First examination report despatched

Effective date: 19970312

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: MUELLER WEINGARTEN AG

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE ES FR IT

REF Corresponds to:

Ref document number: 59502573

Country of ref document: DE

Date of ref document: 19980723

ITF It: translation for a ep patent filed

Owner name: UFFICIO TECNICO ING. A. MANNUCCI

REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2118482

Country of ref document: ES

Kind code of ref document: T3

ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20050819

Year of fee payment: 11

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20060831

Year of fee payment: 12

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20080430

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20070831

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20060831

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20070830

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20110804

Year of fee payment: 17

Ref country code: ES

Payment date: 20110825

Year of fee payment: 17

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20130301

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 59502573

Country of ref document: DE

Effective date: 20130301

REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 20131018

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20120831