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EP0703018B1 - Presse mécanique ou hydraulique - Google Patents

Presse mécanique ou hydraulique Download PDF

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Publication number
EP0703018B1
EP0703018B1 EP95113596A EP95113596A EP0703018B1 EP 0703018 B1 EP0703018 B1 EP 0703018B1 EP 95113596 A EP95113596 A EP 95113596A EP 95113596 A EP95113596 A EP 95113596A EP 0703018 B1 EP0703018 B1 EP 0703018B1
Authority
EP
European Patent Office
Prior art keywords
pressure
press
piston
component
units
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
EP95113596A
Other languages
German (de)
English (en)
Other versions
EP0703018A1 (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
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 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

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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.
  • the sheet metal holder cylinder one Sensor is assigned, which via a control unit Desired pressure change in the sheet metal holder cylinder in Dependence on the respective drawing advance by means of the Proportional or servo valves regulates.
  • DE-32 42 705 C2 is a single-acting drawing press become known, in which the arranged in the press table Pressure cheek of several piston / cylinder units with local different cushioning force can be applied to especially asymmetrical large drawn parts with local to be able to process differently desired forces.
  • the pressure cheek can have a different pulling capacity in the respective areas of a workpiece through targeted Change in the drawing gap can be achieved.
  • For workpieces, that may require an asymmetrical application of force so that different pressures to the sheet metal holder are generated will. There is therefore a force regulation for one differentiated support of the pressure cheek, this the different force on the sheet metal holding device or that Forwards the workpiece.
  • EP 0 438 774 B1 is one double-acting hydraulic press, whose Sheet metal plunger using a valve control during the Deformation of the sheet is subjected to a force that at an appropriate frequency, e.g. B. 20 to 30 Hz cyclically toggles between a minimum and a maximum value to allow the sheet to the respective Adapts deformation requirements. Accordingly, one such a press does not match the drawing progress Pressure control loop provided, but the sheet metal tappet is applied to the workpiece with a specified contact pressure pressed, this contact pressure a pressure oscillation cyclically between a minimum and a maximum value is superimposed. As a result, the material at a printing and thus relieving power the opportunity to flow into given the tool.
  • an appropriate frequency e.g. B. 20 to 30 Hz
  • This arrangement may be used to apply a force Sheet metal plunger and for simply shaped parts work satisfactorily. However, it is complicated Do not divide and especially with single-acting presses can be used because there is a specific regulation of the Sheet metal holding forces required via a pressure cheek.
  • the content of this publication is pre-accelerated Downward movement of the sheet metal holder frame to reduce the Impact force of the upper tool on the sheet metal holder frame.
  • the invention is based, another object Improve the way one works to achieve single-acting press, being an optimal Flow behavior of the workpiece also in the tool itself should be done.
  • the present invention is based on the main idea that an optimal flow behavior of the workpiece in particular in a single-acting press can be achieved in that the pressure cheek arranged in the press table with a Pressure control to generate a targeted pressure profile during the forming process, the additional a certain pressure oscillation is superimposed, with a constantly changing the force application between one 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, the Workpiece both by means of a sheet holder and in Forming tool itself influenced in its flow behavior can be.
  • the sheet metal holder surrounding the lower tool or Hold down over the pressure cheek with a certain predetermined constant or adjustable workpiece holding force be applied to the sheet metal, for example at a Fix thermoforming process.
  • This base load on the Sheet metal holder can have a superimposed pulsating pressure fluctuation be imposed on the constant straining and relieving enables.
  • a predetermined pressure control is accordingly provided with a superimposed pressure vibration.
  • the superimposition of a pressure oscillation on a base load acting workpiece holding pressure can be separated Piston / cylinder units are made that of the respective Pressure cheek are assigned and in particular with the Piston / cylinder units for generating the base load work together.
  • the press 1 shown in FIG. 1 shows only that lower part of such a press.
  • a stationary press table 2 On a stationary press table 2 is a movable Fixed sliding table 3, which is not closer to supporting one shown lower tool is used.
  • a one-piece or multi-part pressure cheek 4 also pressure cushions or die cushions called - that of piston-cylinder units 5, 6 from below is pressurized.
  • 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 engages under each piston / cylinder unit 5, 6 the pressure cheek 4 in a symmetrical arrangement Center of symmetry 8 or in the center of symmetry 8.
  • the pressurization of the piston / cylinder units 5, 6 takes place via control valves 9, 10, which are used as proportional valves or servo valves are formed. Via the feed lines 11, 12 are the piston / cylinder units 5, 6 with pressure medium supplied, with a common pressure connection line 13th is provided. A is preferably used as the printing medium Hydraulic medium used.
  • the proportional valves 9, 10 are only one schematically shown control that regulates Proportional valve 10 designated 14 and only symbolically is shown.
  • the control takes place according to a control curve 16, the shown in the p / t diagram 15 (FIG. 2b) as an example is.
  • This control curve 16 represents a kind of "base load", i. H. an output force that the piston / cylinder units 5, 6 exert pressure on the pressure cheek 4.
  • Each of the Piston / cylinder units 5, 6 can be customized Base load or control curve 16 depending on the nature of the workpiece and forming conditions.
  • the design of the piston / cylinder units 5, 6 can also corresponding to the embodiment according to DE 32 42 705 C2 be trained. On the statements made there corresponding compressed air device is hereby expressly referred.
  • the press in addition to the piston / cylinder units 5, 6, the press according to the invention an equal number of Piston / cylinder units 17, 18, which between the Pressure cheek 4 and the piston rod 7 of the respective Piston / cylinder unit 5, 6 are integrated.
  • This Piston / cylinder units each have a double-sided acted upon piston 19 by an upper Cylinder chamber 20 and a lower cylinder chamber 21 firmly in a hydraulic medium is clamped.
  • About the Hydraulic feed lines 22, 23 become double-sided Actuated piston supplied with pressure medium such that he an upward and downward pressure oscillation carries out.
  • the control unit 24, the one predetermined pressure on the piston 19 by a alternating pressurization of the pressure spaces 20, 21 can make.
  • FIG. 25 Fig.
  • FIG. 2a generates a vibration profile 26, which the Base load from the piston cylinder units 5, 6 superimposed will (Fig. 2c).
  • Fig. 2c is for example such a base load 16 is drawn, which a Harmonic 26 between a maximum value 27 and one Minimum value 28 is superimposed.
  • the moves Piston 29 of the piston-cylinder unit 17, 18 periodically after up and down and thus exerts an alternating pressure the pressure cheek 4.
  • the pressure cheek is coupled to the Workpiece introduced over a certain number Push pin 30 in a manner known per se.
  • the pulsating pressure fluctuation is reflected in its pressure level as well Change frequency experimentally depending on the workpiece properties determined, the alternating frequency in the order of can be around 10 to 40 Hz. Similar relations shows for another machine arrangement the one already cited EP 0 438 774.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Control Of Presses (AREA)
  • Press Drives And Press Lines (AREA)

Claims (4)

  1. Presse, en particulier pour des opérations de déformation et d'emboutissage, comportant un coulisseau de presse ayant une partie supérieure d'outil, ainsi qu'une table de presse ayant une partie inférieure d'outil, la force de maintien des tôles entre la partie inférieure d'outil et la partie supérieure d'outil, dans le cas d'une presse agissant de façon simple, pouvant être réglée au moyen d'une unité de réglage de pression (5,9 ou 6,10) prévue dans la table de presse fixe (2), unité qui agit sur un dispositif de pression (4) prévu au-dessous de la table de presse (3),
    caractérisée en ce que, pendant l'usinage de la pièce, une oscillation de pression (26) pulsée, constante, est superposée à la pression de maintien de la pièce (16) prédéfinie par l'unité de réglage de pression (5,9 ou 6,10), en ce qu'une augmentation et une réduction alternatives de la force de maintien de la pièce ont lieu, les oscillations de pression (26) pouvant être engendrées au moyen d'au moins un vérin (17,18) supplémentaire, qui est agencé entre l'unité de réglage de pression (5,6) et le dispositif de pression (4).
  2. Presse selon la revendication 1,
    caractérisée en ce que, pour régler une force de maintien de la pièce au moyen du dispositif de pression (4), une ou plusieurs unités de réglage de pression sont réalisées comme vérins (5,6), qui sont réglables au moyen de vannes proportionnelles ou de servovannes (9,10), une alimentation en pression réglable du dispositif de pression (4) et, ainsi, une force de maintien de la pièce étant obtenues, et en ce que, à cette force de maintien de la pièce (16) sur le dispositif de pression (4), il est superposé l'oscillation de pression pulsée (26) au moyen de vérins supplémentaires (17,18).
  3. Presse selon une des revendications 1 ou 2,
    caractérisée en ce que l'alimentation en pression pulsée superposée sur le dispositif de pression (4) a lieu par une fréquence appropriée de sorte que la force appliquée sur la pièce et, ainsi, la force de maintien de la pièce sont réglables entre un minimum (28) et un maximum (27).
  4. Presse selon une des revendications précédentes,
    caractérisée en ce que plusieurs unités de pression (5,6) agissent sur un dispositif de pression commun (4) ou plusieurs unités de pression (5,6) agissent sur plusieurs dispositifs de pression partiels, les unités de pression (5,6) étant réglables indépendamment l'une de l'autre et une oscillation de pression pulsée supplémentaire pouvant être superposée à la pression réglable au moyen de vérins supplémentaires (17,18).
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 EP0703018A1 (fr) 1996-03-27
EP0703018B1 true 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)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19538316A1 (de) * 1995-10-14 1997-04-17 Schuler Pressen Gmbh & Co Ziehvorrichtung für eine Presse
NL1021738C2 (nl) * 2002-10-24 2004-04-27 Tno Werkwijze en inrichting voor het reduceren van plooivorming bij dieptrekken.
DE10344941B4 (de) * 2003-09-27 2006-09-28 Wilhelm Karmann Gmbh Vorrichtung zum Steuern einer Werkstückhaltekraft einer Presse zum Tiefziehen von Werkstücken
EP1593443A1 (fr) * 2004-05-07 2005-11-09 Walter, Neff GmbH Presse de formage
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
US10105742B2 (en) * 2014-12-09 2018-10-23 Honda Motor Co., Ltd. Draw press die assembly and method of using the same
CN110640018B (zh) * 2019-08-13 2020-12-04 安庆师范大学 一种多物理场复合效应微成形装置及方法

Family Cites Families (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
DE3431162A1 (de) 1984-08-24 1986-03-06 August Läpple GmbH & Co, 7100 Heilbronn Insbesondere fuer zieh- und tiefziehoperationen zu verwendende presse
DE3640507C3 (de) 1986-11-27 1998-01-29 Mueller Weingarten Maschf Einrichtung zur Steuerung bzw. Regelung der Blechhalterkraft während des Ziehvorganges
DD289724A5 (de) * 1989-12-05 1991-05-08 Fz Fuer Umform- Und Plastverarbeitungstechnik,De Verfahren zur erhoehung des grenztiefziehverhaeltnisses
JPH03193735A (ja) 1989-12-22 1991-08-23 Shionogi & Co Ltd グリコペプチド系抗生物質の安定化組成物
IT1239856B (it) * 1990-01-24 1993-11-15 Fiat Auto Spa Procedimento per lo stampaggio di lamiere e pressa idraulica per la realizzazione di tale procedimento.
DE4100716A1 (de) * 1991-01-14 1992-07-16 Erfurt Umformtechnik Gmbh Einrichtung zum blechhalten in einfachwirkenden pressen

Also Published As

Publication number Publication date
EP0703018A1 (fr) 1996-03-27
ES2118482T3 (es) 1998-09-16
DE59502573D1 (de) 1998-07-23
DE4434419A1 (de) 1996-03-28

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