EP0312808A2 - Presse pour emboutir d'elements en tôle - Google Patents

Presse pour emboutir d'elements en tôle Download PDF

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Publication number
EP0312808A2
EP0312808A2 EP88115855A EP88115855A EP0312808A2 EP 0312808 A2 EP0312808 A2 EP 0312808A2 EP 88115855 A EP88115855 A EP 88115855A EP 88115855 A EP88115855 A EP 88115855A EP 0312808 A2 EP0312808 A2 EP 0312808A2
Authority
EP
European Patent Office
Prior art keywords
force
sheet metal
pressure
metal holder
press
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.)
Withdrawn
Application number
EP88115855A
Other languages
German (de)
English (en)
Other versions
EP0312808A3 (fr
Inventor
Oswald Ostrowski
Volker Dr. Thoms
Bernd Dr. Fugger
Werner Hezel
Thomas Hunyar
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.)
Daimler Benz AG
Original Assignee
Daimler Benz 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 Daimler Benz AG filed Critical Daimler Benz AG
Publication of EP0312808A2 publication Critical patent/EP0312808A2/fr
Publication of EP0312808A3 publication Critical patent/EP0312808A3/fr
Withdrawn legal-status Critical Current

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    • 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
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/20—Deep-drawing
    • B21D22/26—Deep-drawing for making peculiarly, e.g. irregularly, shaped articles
    • 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 press for drawing sheet metal parts according to the preamble of claim 1, as is known for example from DE-PS 24 07 864.
  • the object of the invention is to design the generic press so that it can be reproducibly and quickly reproducibly adjusted to the changed production conditions after a changeover to a changed sheet metal part or to a corresponding tool; in particular, such a changeover should be possible with significantly fewer test impressions than before.
  • the required sheet holder force can be precisely adjusted with high reproducibility, hysteresis-free and inertia.
  • the hydraulic plate holder force control is so precise, so exactly reproducible and so low inertia that even within a press cycle 'the setpoint can be changed depending on the stroke or crank angle depending on a preset program.
  • the sheet metal holder force can optionally be increased or decreased in a targeted and reproducible manner during the pressing process. In individual cases, this depends on the workpiece to be pressed and must be tried out on a case-by-case basis.
  • the press shown schematically in vertical section in FIG. 1 has a press stand 2 and a press table 3, on which the lower tool 9 for the sheet metal part 1 to be pressed is fastened.
  • the press ram 4 is guided vertically in the press stand 2 and can be driven by a stroke via symmetrically arranged connecting rods.
  • the drawing apparatus 5 is attached within the press ram 4, which will be discussed in more detail below.
  • the upper tool 10 is also fastened, which in turn is subdivided into the drawing ram 14 rigidly fastened to the press ram and the sheet metal holder 13, which is guided vertically relative to the drawing ram and can yield under the action of the drawing apparatus under a defined force.
  • the drawing device 5 contains a pressure plate 6 mounted vertically movably within the press ram 4 (this could, however, possibly be omitted in the case of piston rods acting directly on the tool), on the upper side of which a total of four drawing cushions 7, 7 ', 7 designed as a piston / cylinder unit ⁇ , and 7 ⁇ 'are arranged vertically, of which only two die cushions are visible in Figure 1.
  • Each of the die cushions has a pressurized liquid chamber 15, 15 '15'', or 15 ⁇ ', the liquid displaced during the relative displacement of the sheet metal holder 13 relative to the die 14 under defined pressure, ie against defined throttle resistance becomes.
  • Each of the die cushions is therefore provided with a connection for hydraulic fluid.
  • the present invention deals in more detail with the control of the die cushion pressure, which is explained in more detail below in connection with FIG. 4.
  • the sheet metal holder 13 is supported in the vertical direction on the pressure plate 6 and thus on the die cushion 7,7 ', 7 ⁇ , 7 ⁇ '.
  • the piston rods would extend directly to the sheet metal holder 13.
  • the sheet metal holder is also held in the direction of gravity, but this is not dealt with in more detail in the present drawing.
  • the distribution of the four pressure pins 8,8 ', 8 ⁇ and 8 ⁇ ' can be seen from Fig.2.
  • Each of the four pressure bolts 8, 8 ', 8 ⁇ , 8 ⁇ ' is assigned a sheet holder area 18, 18 ', 18 ⁇ and 18 ⁇ ' located at a corner of the sheet holder.
  • a special die cushion can be assigned to each of these sheet holder areas.
  • Each of these sheet holder areas in the embodiment of the invention shown in FIGS. 1 to 4 is associated with a sheet holder integrated power transmitter 16, 16 ', 16' or 16 '', which is formed by the vertical wall claimed by the power flow 34 the plate holder is provided with a pair of horizontally adjacent bores 31; Between the two bores 31 there remains a vertically standing biconcave web 32, at the thinnest point of which a strain gauge 22 is attached on both sides. This vertically standing web is deformed by the portion of the sheet metal holder force which is attributable to the associated sheet metal holder region 18, 18 ', 18 ⁇ or 18 ⁇ ', which can be detected by the strain gauges 22.
  • a fully integrated, component-integrated design of the force transmitter is preferable to a force transmitter inserted tightly into a corresponding recess, because when the joint gap is loaded, hysteresis influences can be entered into the force measurement, which should be avoided here if possible.
  • the hydraulic plate holder force control will be described below with reference to the hydraulic diagram according to FIG. 4.
  • the four hydraulic drawing cushions 7,7 ', 7 ⁇ and 7 ⁇ ' assigned to the different areas 18, 18 ', 18 ⁇ and 18 ⁇ ' of the sheet metal holder circumference are shown with the different pressure spaces 15, 15 ', 15 ⁇ or 15 ⁇ 'Also the four different previously mentioned force transducers 16,16', 16 ⁇ and 16 ⁇ 'are shown there; together they become one Battery 35 fed and are parallel to each other with respect to the energy supply.
  • the measuring taps of the strain resistors of a force transmitter 15, 15 ', 15 ⁇ and 15 ⁇ ' each representing a Wheatstone bridge are shown separately for each force transmitter.
  • Each individual die cushion 7,7 ', 7 ⁇ or 7 ⁇ ' and each associated force transmitter is assigned a controller 20,20 ', 20 ⁇ or 20 ⁇ ', on the input of which the measuring pick-up of the force transmitter 16,16 ', 16th ⁇ , 16 ⁇ 'is switched.
  • Each of the four controllers 20 mentioned is assigned a setpoint adjuster 19, 19 ', 19 ⁇ or 19janen', the output of which is also connected to the controller input.
  • the force transmitter and the setpoint adjuster both emit a similar and comparable electrical signal.
  • the controller 20 compares the target signal with the actual signal of the sheet metal holder force and emits a corresponding signal at its output in accordance with the difference between the two, with which a control intervention can be carried out which eliminates any established / actual deviation that has been found.
  • a throttle valve 21, 21 ', 21 ⁇ and 21 ⁇ ' is provided for each of the four controlled systems.
  • These throttle valves can first be electrically pilot-controlled by the regulators via an electro-hydraulic pilot valve. Hydraulically, the electro-hydraulic pilot valve is supplied from a control oil pump 23, which draws in from a separate control oil sump 25; With regard to the sensitivity of the electro-hydraulic pilot valves, this circuit is kept particularly clean, which is indicated by the filter 24.
  • the electro-hydraulic pilot valve is opened and opened more or less in accordance with this electrohydraulic amplification, the throttle valve 21 is also opened to a greater or lesser extent and the flow resistance is correspondingly increased or decreased.
  • the flow resistance of one of the throttle valves increases, the pressure in the die cushion in question increases during the relative displacement of the hold-down device relative to the drawing die, i.e. during the displacement phase of the hydraulic fluid from the pressure chambers 15, 15 ', 15 ⁇ 15 ⁇ ', and accordingly the die cushion also increases Sheet metal holder force in the relevant area of the sheet metal holder.
  • the sheet metal holder force decreases in an analogous manner in the assigned sheet metal holder area.
  • the associated throttle valve is adjusted in the direction of a higher flow resistance, so that the pressure in the associated pressure chamber 15 increases. If, on the other hand, the sheet metal holder force rises in certain areas beyond the specified target value, then the relevant throttle valve 21 is adjusted in the direction of a lower flow resistance, so that the pressure in the force-determining pressure chamber 15 drops. If the predetermined sheet metal holder force is reached again during such a control intervention, the throttle valve remains in the then open position and maintains the then existing flow resistance; the pressure then present in the force-determining pressure chamber 15 is retained.
  • each individual control circuit is provided in its hydraulic part with a pressure relief valve 26,26 ', 26 ⁇ or 26 ⁇ '. If the pressure in the working line or in the associated pressure chamber 15, 15 ′, 15 ⁇ or l5 ⁇ ′ exceeds a presettable maximum value, 26 working oil flows out at the pressure relief valve. With this working oil flowing under high pressure, a common emergency stop switch 27 can be actuated for all four pressure relief valves 26, 26 ', 26 ⁇ , 26 ⁇ ', which may stop the press.
  • the component-integrated force transducer is designed differently there than in the exemplary embodiment according to FIGS. 1 to 3.
  • the load-bearing component cross section is also local there with a low notch effect targets weakened load capacity, and the weak points are applied with strain gauges 22.
  • the weak point here is in the form of cup-shaped depressions 33 which are incorporated into the pressure pin 8 on the circumference.
  • a strain gauge 22 is glued to the smooth, flat "bottom" of the recess 33.
  • small holes are made from the recess 33 to the center of the bolt, where an axially extending hole passes.
  • the connecting lines for energy and measurement signal of the strain gauges run through these holes in a protected manner.
  • integrated strain gauges with four strain resistors can be applied, in which the individual strain resistors are combined to form a Wheatstone bridge. In any case, however, care must be taken to ensure that the individual elongation resistances of the Wheatstone bridge are either parallel or transverse to the direction of force flow 34.
  • three depressions 33 are provided on the circumference of the pressure pin 8; the connections of the individual strain resistors of the various strain gauges must be led out individually and connected in series to form a common bridge branch. Namely, the mutually comparable expansion resistances are connected in series to form a bridge branch. In this way, all three deformations at the depressions 33 are averaged.
  • each individual force-determining pressure space 15, 15 ', 15 ⁇ , 15 ⁇ ' each has a separate pressure transducer 17, 17 ', 17 ⁇ or 17 ⁇ 'is assigned. This converts the pressure signal into a corresponding electrical signal, which is connected to the input of the associated controller 20, 20 ', 20 ⁇ , 20 ⁇ '.
  • the mode of operation of the hydraulic diagram according to FIG. 8 is quite analogous to the mode of operation of the diagram according to FIG.
  • FIG. 8 the possibility of a change in the setpoint dependent on the crank angle is also indicated in FIG. 8.
  • An angle sensor 29 is coupled to the stylized crankshaft 28 of the press, which emits an electrical signal corresponding to the instantaneous rotational position of the crankshaft 28.
  • This is switched to four different function transmitters 30, 30 ', 30 ⁇ or, 30 ⁇ '.
  • These function transmitters are designed in such a way that, depending on the crank angles, a different function value can be output with which the associated setpoint adjuster 19, 19, 19 'or 19 ⁇ 'can be changed. Thanks to the quick response of the controlled system, it can also follow a setpoint setting changed during the stroke relatively quickly.
  • the sheet metal holder forces are gradually increased or decreased within a pressing cycle 'as required.
  • the individual function generators 30, 30 ', 30 ⁇ ', 30 ⁇ '- after they have been individually optimized for a specific workpiece - can be removed and exchanged for other function generators that have been optimized for another workpiece. This replacement of the function transmitters can be effected by switching over to a control center, where all function transmitters optimized for different workpieces are installed in groups and kept on standby.
  • FIG. 9 A possible application of a somewhat simpler press is shown in FIG. 9, in which the drawing apparatus 5a is installed in the press table 3a.
  • the press ram 4a of this press is much simpler than the press ram 4 of the press according to FIG. 1.
  • the lower tool 12 is divided into the drawing punch 14a and sheet metal holder 13a; here the upper tool 11 is the simpler.
  • a pressure box 6a is provided which has a certain minimum extension in the vertical direction in order to ensure good vertical guidance possible.
  • the sheet holder 13a is supported on the pressure box 6a.
  • the pressure box 6a lowers against a defined resistance.
  • the force-controlled or pressure-controlled discharge resistance on the hydraulic die cushion 7a determines the sheet holder force; however, only the total force of the sheet holder can be regulated in the simplified press according to FIG. 9.
  • the associated hydraulic diagram can be designed according to the model of FIG. 4 or also according to the model of FIG. 8, only one controlled system needing to be provided in accordance with the arrangement of only a single die cushion 7a.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Control Of Presses (AREA)
EP88115855A 1987-10-21 1988-09-27 Presse pour emboutir d'elements en tôle Withdrawn EP0312808A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3735581 1987-10-21
DE19873735581 DE3735581C1 (de) 1987-10-21 1987-10-21 Presse zum Ziehen von Blechteilen

Publications (2)

Publication Number Publication Date
EP0312808A2 true EP0312808A2 (fr) 1989-04-26
EP0312808A3 EP0312808A3 (fr) 1989-10-18

Family

ID=6338757

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88115855A Withdrawn EP0312808A3 (fr) 1987-10-21 1988-09-27 Presse pour emboutir d'elements en tôle

Country Status (4)

Country Link
EP (1) EP0312808A3 (fr)
JP (1) JPH01127118A (fr)
DD (1) DD283086A5 (fr)
DE (1) DE3735581C1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0401534A1 (fr) * 1989-05-13 1990-12-12 Maschinenfabrik Müller-Weingarten AG Dispositif d'étirage hydraulique dans une table de presse à simple ou a double effet
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
EP0453955A1 (fr) * 1990-04-23 1991-10-30 Maschinenfabrik Müller-Weingarten AG Dispositif pour emboutir des pièces de tôle dans une presse
EP0673695A1 (fr) * 1994-02-24 1995-09-27 Umformtechnik ERFURT GmbH Procédé et arrangement de réglage pour interrompre et continuer l'emboutissage à presses à deux étages, en particulier à presses hydrauliques
GB2406817A (en) * 2003-01-10 2005-04-13 Daimler Chrysler Ag Moulding Device
US7112049B2 (en) 2003-01-10 2006-09-26 Daimlerchrysler Ag Deep-drawing tool

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3744177A1 (de) * 1987-12-24 1989-07-06 Audi Ag Verfahren zum tiefziehen von platinen, insbesondere von tiefziehblechen fuer karosserieelemente von kraftfahrzeugen
DE4132607B4 (de) * 1991-10-01 2004-05-19 Umformtechnik Erfurt Gmbh Verfahren und Vorrichtung zur sollteilspezifischen Werkzeugeinstellung
DE4229155C2 (de) * 1992-09-01 1994-06-23 Daimler Benz Ag Verfahren zur selbsttätigen, iterativen Prozeßoptimierung von Ziehvorgängen in Pressen
DE4441562A1 (de) * 1994-11-23 1996-05-30 Erfurt Umformtechnik Gmbh Längenkompensationseinrichtung in einer Klemmeinrichtung zwischen Ober- und Unterwerkzeug einer Presse
DE102015224778B4 (de) 2015-12-10 2021-03-11 Bayerische Motoren Werke Aktiengesellschaft Druckbolzen einer Presse sowie Presse mit Druckbolzen
WO2018168311A1 (fr) * 2017-03-17 2018-09-20 株式会社ヒロテック Dispositif d'étirage
DE102017214660B4 (de) * 2017-08-22 2022-12-15 Bayerische Motoren Werke Aktiengesellschaft Druckbolzen einer Presse sowie Presse mit Druckbolzen
US11020786B2 (en) * 2017-09-25 2021-06-01 Oakland University System for controlling the restraining force applied to a panel during a drawing operation

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2407864B2 (de) * 1974-02-19 1976-02-19 Maschinenfabrik Weingarten Ag, 7987 Weingarten Druckbolzenanordnung an einem druckkissen fuer pressen
DE2609916A1 (de) * 1976-03-10 1977-09-15 Etscheid Ohg Hermann Niederhaltevorrichtung an einer tiefziehpresse
DE3406526A1 (de) * 1984-02-23 1985-09-12 Maschinenfabrik Müller-Weingarten AG, 7987 Weingarten Schiebetisch mit eingebautem blechhalterrahmen
EP0173755A1 (fr) * 1984-06-29 1986-03-12 L. SCHULER GmbH Dispositif d'étirage dans une presse
US4635466A (en) * 1984-04-27 1987-01-13 Kabushiki Kaisha Komatsu Seisakusho Die cushion apparatus for use in a press machine

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE735158C (de) * 1939-04-30 1943-05-07 Messerschmitt Boelkow Blohm Einrichtung zum Steuern des Druckes eines pneumatischen bzw. hydropneumatischen Faltenhalters einer Blechziehpresse
US3108470A (en) * 1960-03-28 1963-10-29 Danly Mach Specialties Inc High speed tonnage indicator for power press
JPS532423B2 (fr) * 1973-09-27 1978-01-27
JPS558307A (en) * 1978-06-30 1980-01-21 Hideo Ichikawa Hydraulic press for deep drawing work
DE2833829C2 (de) * 1978-08-02 1986-11-27 L. Schuler GmbH, 7320 Göppingen Schaltungsanordnung für einen Stellantrieb einer Stößelverstellung
JPS5949120B2 (ja) * 1978-12-14 1984-11-30 株式会社サム電子機械 油圧式圧縮装置
CS217858B1 (en) * 1981-02-09 1983-01-28 Jaroslav Pecha Method of the metal sheet shaping and device for executing the said method
JPS59212200A (ja) * 1983-05-18 1984-12-01 Toyota Motor Corp プレス荷重の動特性制御装置
JPS609526A (ja) * 1983-06-28 1985-01-18 Toyota Motor Corp ブランクホルダ加圧力制御方法およびその装置
EP0151198B1 (fr) * 1984-02-03 1989-01-04 L. SCHULER GmbH Dispositif de réglage de pression dans des presses

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2407864B2 (de) * 1974-02-19 1976-02-19 Maschinenfabrik Weingarten Ag, 7987 Weingarten Druckbolzenanordnung an einem druckkissen fuer pressen
DE2609916A1 (de) * 1976-03-10 1977-09-15 Etscheid Ohg Hermann Niederhaltevorrichtung an einer tiefziehpresse
DE3406526A1 (de) * 1984-02-23 1985-09-12 Maschinenfabrik Müller-Weingarten AG, 7987 Weingarten Schiebetisch mit eingebautem blechhalterrahmen
US4635466A (en) * 1984-04-27 1987-01-13 Kabushiki Kaisha Komatsu Seisakusho Die cushion apparatus for use in a press machine
EP0173755A1 (fr) * 1984-06-29 1986-03-12 L. SCHULER GmbH Dispositif d'étirage dans une presse

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0401534A1 (fr) * 1989-05-13 1990-12-12 Maschinenfabrik Müller-Weingarten AG Dispositif d'étirage hydraulique dans une table de presse à simple ou a double effet
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
EP0453955A1 (fr) * 1990-04-23 1991-10-30 Maschinenfabrik Müller-Weingarten AG Dispositif pour emboutir des pièces de tôle dans une presse
EP0673695A1 (fr) * 1994-02-24 1995-09-27 Umformtechnik ERFURT GmbH Procédé et arrangement de réglage pour interrompre et continuer l'emboutissage à presses à deux étages, en particulier à presses hydrauliques
GB2406817A (en) * 2003-01-10 2005-04-13 Daimler Chrysler Ag Moulding Device
GB2406817B (en) * 2003-01-10 2005-06-15 Daimler Chrysler Ag Moulding device
US7112049B2 (en) 2003-01-10 2006-09-26 Daimlerchrysler Ag Deep-drawing tool

Also Published As

Publication number Publication date
EP0312808A3 (fr) 1989-10-18
DD283086A5 (de) 1990-10-03
DE3735581C1 (de) 1988-05-11
JPH01127118A (ja) 1989-05-19

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