EP0768127A2 - Dispositif d'étirage pour une presse - Google Patents

Dispositif d'étirage pour une presse Download PDF

Info

Publication number
EP0768127A2
EP0768127A2 EP96116085A EP96116085A EP0768127A2 EP 0768127 A2 EP0768127 A2 EP 0768127A2 EP 96116085 A EP96116085 A EP 96116085A EP 96116085 A EP96116085 A EP 96116085A EP 0768127 A2 EP0768127 A2 EP 0768127A2
Authority
EP
European Patent Office
Prior art keywords
piston
pressure
cylinder
piston rod
acceleration
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
EP96116085A
Other languages
German (de)
English (en)
Other versions
EP0768127B1 (fr
EP0768127A3 (fr
Inventor
Siegfried Baur
Heinz Horn
Hartmut Dexling
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.)
L Schuler GmbH
Original Assignee
L Schuler GmbH
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 L Schuler GmbH filed Critical L Schuler GmbH
Publication of EP0768127A2 publication Critical patent/EP0768127A2/fr
Publication of EP0768127A3 publication Critical patent/EP0768127A3/fr
Application granted granted Critical
Publication of EP0768127B1 publication Critical patent/EP0768127B1/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
    • 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 pulling device for a press according to the kind defined in the preamble of claim 1.
  • the sheet inserted into the tool or a sheet holder is first pressed against the sheet holder by the drawing ring and then moved together with the sheet holder against the holding force exerted by the drawing device.
  • the sheet held between the sheet holder and the drawing ring is deformed by the drawing punch of the tool half on the press table.
  • the plunger In addition to the holding force to be exerted by the pulling device, the plunger must also support the inertia forces caused by the acceleration of the movable sheet metal holder and pulling device masses at the beginning of the Deformation take effect, overcome.
  • DE-OS 40 28 920 discloses a mechanical or hydraulic press with a pulling device for drawing work or a drawing step of a step press.
  • the workpiece is clamped in a known manner using a sheet metal holder.
  • the movement of the press ram is transmitted to at least one hydraulic cylinder, the hydraulic medium of which acts via a control or positively controlled on a further pressure cylinder and in particular a damping cylinder, which has a die cushion and is thus connected to the sheet metal holder and thereby accelerates the sheet metal holder in the direction of drawing.
  • a disadvantage of the mechanical or hydraulic press known from the aforementioned publication is that the acceleration of the lower die of the press takes place depending on the path of the ram of the press, which means that there is no possibility of accelerating or starting the acceleration of the lower die with the Sheet holder can be freely defined or changed.
  • a generic pulling device for a press is known from DE-OS 36 40 788.
  • a pulling device for a press with a mechanically moved ram and with a sheet metal holder is described, the holding force acting on the sheet against the pulling direction is applied via a piston rod of a pressurized pressure cylinder that is pressurized with pressure medium, the piston rod being pressurized with a pressure piston Effective surface is operatively connected and a ram path-dependent control is provided, by means of which the plunger can be pre-accelerated in the direction of drawing before the drawing plunger is placed on the sheet metal holder by acting on the active surface with hydraulic fluid.
  • the assigned pressure chamber can be connected on the one hand to the pressure chamber of a pre-acceleration cylinder and, via a follow-up control, to a reservoir for hydraulic fluid.
  • a disadvantage of the pulling device described is that it can also be controlled as a function of the path of the pulling ram of the press and that a relatively long time is required to accelerate the lower tool in the pulling direction.
  • the arrangement described is relatively susceptible to vibrations.
  • the present invention is therefore based on the object of providing a drawing device for a press, by means of which the lower tool or the sheet metal holder arranged on the lower tool and thus also the workpiece can be accelerated in the drawing direction quickly and independently of the path of the drawing ram of the press.
  • pressure medium can be fed very quickly into the second pressure chamber during acceleration of the pre-acceleration piston and the pre-acceleration piston together with the piston rod can be accelerated correspondingly quickly in the direction of pull.
  • the quantity of pressure medium displaced from the first pressure chamber by the pre-acceleration piston is fed to a dosing cylinder, by means of which the path of the pre-acceleration piston which it is intended to cover during the pre-acceleration phase of the drawing process, i.e. during the acceleration of the sheet metal holder to the speed of the drawing ram, can be set.
  • the pressure build-up takes place after the displacement of pressure medium from the feed cylinder by the feed piston and during the controlled discharge of pressure medium displaced by the feed plunger from the feed cylinder.
  • the pre-acceleration of the lower tool of the press or the sheet metal holder and the pressure build-up for the forming process take place in two separate and successive or in common stages.
  • the control of the corresponding components or assemblies which initiate the acceleration of the pre-acceleration piston can take place independently of the position of the drawing ram, so that the time at which acceleration of the pre-acceleration piston and all components and assemblies directly or indirectly connected to it starts to be adjustable.
  • the pre-acceleration piston is arranged concentrically to the piston rod, whereby the entire pulling device according to the invention can be constructed in an extremely space-saving manner.
  • a stop can be provided on the end of the piston rod facing away from the sheet metal holder.
  • the stop can be designed as an adjustable stop member.
  • pressure pins 2 are arranged on a pressure box 1, of which only one pressure pin 2 is shown in the view according to FIG. 1 for reasons of clarity.
  • the lower tool, not shown, of the press with the sheet metal holder is attached to the pressure pins 2.
  • the pressure box 1 is connected to a piston rod 4 acting parallel to the direction of drawing (arrow 3), which is guided in a suitable and known manner.
  • a pre-acceleration cylinder 5 Concentric to the piston rod 4 is a pre-acceleration cylinder 5 which is fixed to the press and has a pre-acceleration piston 6 provided therein and displaceable in the axial direction of the piston rod 4.
  • the pre-acceleration cylinder 5 has a first pressure chamber 7 and a second pressure chamber 8, the first pressure chamber 7 being assigned a first active surface 9 and the second pressure chamber 8 a second active surface 10 of the pre-acceleration piston 6.
  • the first pressure chamber 7 and the second pressure chamber 8 are arranged one above the other.
  • other arrangements of the pressure spaces 7, 8 with respect to one another are also possible.
  • the same pressure is applied to the first active surface 9 and to the second active surface 10 from a pressure accumulator 11 of a known type.
  • the pressure accumulator 11 can be charged to a suitable pressure by means of a pump 12.
  • a suitable hydraulic fluid or compressed air can be used as the pressure medium.
  • the pressure contained in the pressure accumulator 11 or the pressure medium contained therein is supplied to the first pressure chamber 7 and the second pressure chamber 8 via a cartridge 13 in the basic position of the drawing device shown in FIG the annular design of the first active surface 9, which is provided to be larger than the second active surface 10, which is also annular, the pre-acceleration piston 6 is held in its position shown in FIG. 1.
  • the cartridge 13 is controlled such that the pressure present in the pressure accumulator 11 is only present in the second pressure chamber 8, and at the same time a proportional valve 14, which is arranged between the first pressure chamber 7 and a press-tight metering cylinder 15, is opened, it is due to the lower pressure of the pre-acceleration pistons 6 in the first pressure chamber 7 compared to the second pressure chamber 8 is accelerated in the direction of pull 3, pressure medium from the first pressure chamber 7 being fed to the metering cylinder 15 in a controlled manner via the proportional valve 14.
  • a metering piston 16 is arranged in the metering cylinder 15 and is displaced downward in the view according to FIG. 1 by the pressure medium displaced from the first pressure chamber 7.
  • the pre-acceleration cylinder 5 is operatively connected to the piston rod 4 in a suitable manner the piston rod 4 and the pressure box 1 connected to it, with all the components attached to it, including the sheet metal holder, accelerated by the pressure medium conveyed from the pressure accumulator 11 into the second pressure chamber 8 to a speed which corresponds to the speed of the drawing plunger (not shown) Press corresponds.
  • the pre-acceleration path is limited by the metering piston 16, which is displaceably guided in the metering cylinder 15, i.e. as soon as the metering piston 16 is at its stop, the pre-acceleration process or the pre-acceleration phase is completed and further acceleration of the pre-acceleration piston 6 and the piston rod 4 by pressure medium from the pressure accumulator 11 is no longer possible.
  • a press-resistant feed cylinder 17 is also connected to the pressure box 1.
  • a plurality of press-resistant feed cylinders 17 connected to the pressure box 1 can also be provided.
  • a feed piston rod 18, which produces the connection to the pressure box 1 and a feed piston 19, which is provided separately from the feed piston rod 18, are displaceably arranged parallel to the pulling direction 3.
  • a first pressure medium volume 20 is provided between the advance piston rod 18 and the advance piston 19, and a second pressure medium volume 21 is provided on the side of the advance piston 19 facing away from the first pressure medium volume 20.
  • the supply piston rod 18 is also moved in the direction of pull 3, as a result of which the first pressure medium volume 20 moves downward unchanged together with the supply piston 19 and, at the same time, the second pressure medium volume 21 is pressed into a further pressure accumulator 22 by the supply piston 19, which likewise moves in the pulling direction 3.
  • the second pressure medium volume 21 displaced by the advance piston 19 is provided in such a way that after the pre-acceleration phase has ended, that is to say when the metering piston 16 of the metering cylinder 15 is in its intended end position, the advance piston 19 has also reached its end position.
  • the second pressure medium volume 21 and the volume of the pressure medium present in the first pressure chamber 7 of the pre-acceleration cylinder 5 must be provided such that they each define the same path of the pressure box 1 or the piston rod 4.
  • the ram of the press sits on the sheet metal holder and the sheet metal holder or the pressure box 1 is moved further in the direction of pull 3 by the ram of the press.
  • a corresponding pressure must be built up, which acts counter to the direction of drawing 3.
  • a regulated pressure suitable for the forming process can be set by means of a suitable regulation.
  • a suitable device or arrangement for controlling the pneumatic cylinder 25 is known from practice, which is why it will not be discussed in more detail here.
  • the cartridge 13 is actuated, so that the same pressure prevails in the first pressure chamber 7 and in the second pressure chamber 8, as a result of which, owing to the larger first active surface 9, the pre-acceleration piston 6 counter to the direction of pull 3 into the basic position shown in FIG. 1 is moved.
  • the pre-acceleration piston 6 is thus moved back into its basic position independently of the piston rod 4 and the pressure box 1.
  • the metering piston 16 is also returned to its starting position in a suitable manner, the volume of pressure medium contained in the metering cylinder 15 being conveyed back into the first pressure chamber 7.
  • the first pressure medium volume 20 is refilled to a preset value and from the further one Pressure accumulator 22 is supplied with pressure medium in the second pressure medium volume 21, as a result of which the supply piston 19 also moves into its basic position counter to the direction of drawing 3.
  • a stop member 36 which is adjustable by means of a worm wheel 27 is provided, which in the present exemplary embodiment interacts with a stop nut 28, so that the depth of the pulling device can be adjusted in a simple manner by means of the parallel to the pulling direction 3 Stop member 36 can be adjusted.
  • the stop member 36 is displaced by the pre-acceleration piston 6 during the pre-acceleration phase in the direction of pull 3 and in doing so presses on the stop nut 28 firmly connected to the piston rod 4, as a result of which the pressure box 1 is accelerated.
  • piston rod 4 is provided with a damping device 29, by means of which the piston rod 4, with all the components connected thereto, in particular with the pressure box 1, can be brought into its basic position shown in FIG. 1 after the shaping process.
  • pre-acceleration of the pressure box 1 with the lower tool of the press or the sheet metal holder attached thereon can be achieved quickly and independently of the path or the position of the pulling ram of the press.
  • control of the described components or assemblies takes place in a known manner by means of a control, not shown.
  • FIG. 2 shows a section of a diagram in which the stroke of the drawing ram is plotted against the angle of rotation of the drive, a curve 30 for a possible movement of the drawing ram of a press and a curve 31 for a possible movement of the printing box 1 and thus also of the sheet metal holder.
  • the sheet holder is accelerated from a freely definable or dynamic point 32, which is not dependent on the path of the ram of the press.
  • the acceleration or pre-acceleration of the sheet metal holder or pressure box 1 takes place up to a point 33 at which the speed of the pressure box 1 corresponds to the speed of the drawing ram. From point 33, the pressure builds up in the feed cylinder 17 (see FIG. 1) and the pressure box 1 is moved further in the direction of drawing 3 at the speed of the drawing ram.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Press Drives And Press Lines (AREA)
  • Control Of Presses (AREA)
EP96116085A 1995-10-14 1996-10-08 Dispositif d'étirage pour une presse Expired - Lifetime EP0768127B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19538316 1995-10-14
DE19538316A DE19538316A1 (de) 1995-10-14 1995-10-14 Ziehvorrichtung für eine Presse

Publications (3)

Publication Number Publication Date
EP0768127A2 true EP0768127A2 (fr) 1997-04-16
EP0768127A3 EP0768127A3 (fr) 1997-04-23
EP0768127B1 EP0768127B1 (fr) 2000-07-12

Family

ID=7774877

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96116085A Expired - Lifetime EP0768127B1 (fr) 1995-10-14 1996-10-08 Dispositif d'étirage pour une presse

Country Status (5)

Country Link
US (1) US5746084A (fr)
EP (1) EP0768127B1 (fr)
CZ (1) CZ290543B6 (fr)
DE (2) DE19538316A1 (fr)
ES (1) ES2149413T3 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3640788A1 (de) * 1986-11-28 1988-06-01 Schuler Gmbh L Zieheinrichtung fuer eine presse
EP0417752A2 (fr) * 1989-09-12 1991-03-20 Maschinenfabrik Müller-Weingarten AG Presse mécanique ou hydraulique avec dispositif d'étirage ou d'emboutissage pour presse à plusieurs étapes
EP0635320A1 (fr) * 1993-07-24 1995-01-25 Umformtechnik ERFURT GmbH Serre-flan pour presses à simple effet en particulier pour presses mécaniques et presses de transfert
EP0703018A1 (fr) * 1994-09-26 1996-03-27 Maschinenfabrik Müller-Weingarten Ag Presse mécanique ou hydraulique

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2674138A (en) * 1952-04-30 1954-04-06 Paul D Mize Drilling, boring, or other machine
DE3170614D1 (en) * 1981-09-12 1985-06-27 Schuler Gmbh L Deep-drawing arrangement for presses with mechanically driven drawing punch
DE4028920A1 (de) * 1989-09-12 1991-03-14 Mueller Weingarten Maschf Mechanische oder hydraulische presse mit zieheinrichtung oder ziehstufe einer stufenpresse

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3640788A1 (de) * 1986-11-28 1988-06-01 Schuler Gmbh L Zieheinrichtung fuer eine presse
EP0417752A2 (fr) * 1989-09-12 1991-03-20 Maschinenfabrik Müller-Weingarten AG Presse mécanique ou hydraulique avec dispositif d'étirage ou d'emboutissage pour presse à plusieurs étapes
EP0635320A1 (fr) * 1993-07-24 1995-01-25 Umformtechnik ERFURT GmbH Serre-flan pour presses à simple effet en particulier pour presses mécaniques et presses de transfert
EP0703018A1 (fr) * 1994-09-26 1996-03-27 Maschinenfabrik Müller-Weingarten Ag Presse mécanique ou hydraulique

Also Published As

Publication number Publication date
CZ290543B6 (cs) 2002-08-14
CZ298996A3 (en) 1997-04-16
EP0768127B1 (fr) 2000-07-12
ES2149413T3 (es) 2000-11-01
EP0768127A3 (fr) 1997-04-23
DE59605580D1 (de) 2000-08-17
DE19538316A1 (de) 1997-04-17
US5746084A (en) 1998-05-05

Similar Documents

Publication Publication Date Title
DE3238111C1 (de) Hydraulikeinrichtung fuer die Formschliesseinheit einer Kunststoff-Spritzgiessmaschine
EP1189745B1 (fr) Dispositif de decoupage fin de pieces dans un materiau
EP3368230B1 (fr) Dispositif actionneur
DE10206630B4 (de) Verfahren und Vorrichtung zum Hochgeschwindigkeitspressen von Werkstücken
EP3115122B1 (fr) Dispositif et procede destines a enlever/ejecter une grille d'estampillage/piece de formage interieure et a ejecter une partie decoupee dans une presse pour decoupage fin
DE2600948C3 (de) Krafteinheit als Arbeitsorgan, z.B. für Pressen zum Formgeben, Verdichten usw.
DE2926964A1 (de) Einrichtung an hydraulischen pressen und abkantpressen
DE4243735C2 (de) Vorrichtung zum Schließen und Zuhalten der Form einer Formmaschine
EP1055466B1 (fr) Système d'entraínement hydraulique pour une machine d'assemblage
DE10005023C2 (de) Feinschneidpresse
EP3056291B1 (fr) Presse dotée d'un amortisseur de choc de coupe
WO2010051913A1 (fr) Convertisseur de forces hydraulique
EP0417754B1 (fr) Presse mécanique ou hydraulique avec dispositif d'étirage ou d'emboutissage pour presse à plusieurs étapes
EP0768127B1 (fr) Dispositif d'étirage pour une presse
EP0573830B1 (fr) Dispositif d'étirage hydraulique dans une presse
WO2005021253A2 (fr) Presse hydraulique
EP0417753B1 (fr) Presse mécanique ou hydraulique avec dispositif d'étirage ou d'emboutissage pour presse à plusieurs étapes
DE3433121C1 (de) Verfahren und Vorrichtung zur Dämpfung der am Ende der Formfüllphase auftretenden Druckspitze bei Druckgießmaschinen
DE2432774B2 (de) Presse, insbesondere Feinschneidpresse
DE4028920A1 (de) Mechanische oder hydraulische presse mit zieheinrichtung oder ziehstufe einer stufenpresse
DE10030792C2 (de) Mehrstufenpresse, insbesondere Quertransportpresse, mit hydraulischer Schließvorrichtung
DE2833626A1 (de) Kombinierte press- und stanzvorrichtung
DE19711207A1 (de) Ziehvorrichtung für eine Presse
DE4028919A1 (de) Mechanische oder hydraulische presse mit zieheinrichtung oder ziehstufe einer stufenpresse
DE1145018B (de) Schnellarbeitende hydraulische Presse, insbesondere Schmiedepresse oder Ziehpresse

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

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): DE ES FR GB IT SE

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): DE ES FR GB IT SE

17P Request for examination filed

Effective date: 19971017

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

Owner name: SCHULER PRESSEN GMBH & CO. KG

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

17Q First examination report despatched

Effective date: 19991221

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

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 GB IT SE

REF Corresponds to:

Ref document number: 59605580

Country of ref document: DE

Date of ref document: 20000817

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 20000727

ITF It: translation for a ep patent filed

Owner name: STUDIO JAUMANN P. & C. S.N.C.

ET Fr: translation filed
REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2149413

Country of ref document: ES

Kind code of ref document: T3

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
REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

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

Ref country code: GB

Payment date: 20020919

Year of fee payment: 7

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

Ref country code: FR

Payment date: 20021018

Year of fee payment: 7

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

Ref country code: ES

Payment date: 20021021

Year of fee payment: 7

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

Ref country code: SE

Payment date: 20021025

Year of fee payment: 7

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

Ref country code: GB

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

Effective date: 20031008

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

Ref country code: SE

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

Effective date: 20031009

Ref country code: ES

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

Effective date: 20031009

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

Ref country code: DE

Payment date: 20031216

Year of fee payment: 8

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20031008

EUG Se: european patent has lapsed
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: 20040630

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 20031009

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: 20050503

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;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20051008