EP0406792B1 - Couplage de réglage pour la course supérieure pour la jumelle de pression d'un dispositif d'emboutissage - Google Patents

Couplage de réglage pour la course supérieure pour la jumelle de pression d'un dispositif d'emboutissage Download PDF

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Publication number
EP0406792B1
EP0406792B1 EP90112668A EP90112668A EP0406792B1 EP 0406792 B1 EP0406792 B1 EP 0406792B1 EP 90112668 A EP90112668 A EP 90112668A EP 90112668 A EP90112668 A EP 90112668A EP 0406792 B1 EP0406792 B1 EP 0406792B1
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EP
European Patent Office
Prior art keywords
blocking
control
flow
pressure
valve
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
EP90112668A
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German (de)
English (en)
Other versions
EP0406792A1 (fr
Inventor
Siegfried Baur
Gerhard Roos
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
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Filing date
Publication date
Application filed by L Schuler GmbH filed Critical L Schuler GmbH
Publication of EP0406792A1 publication Critical patent/EP0406792A1/fr
Application granted granted Critical
Publication of EP0406792B1 publication Critical patent/EP0406792B1/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
    • 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
    • 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
    • B21D24/04—Blank holders; Mounting means therefor
    • B21D24/08—Pneumatically or hydraulically loaded blank holders

Definitions

  • the invention relates to a control circuit according to the preamble of claim 1.
  • a control circuit is known for example from DE-A-35 05 984.
  • the run-up control of the pressure cheek acted on by the drawing cylinders starts when the bottom dead center passes through the ram - the end of the forming in the machining level.
  • the acceleration control provides for the pressure cheek to either be lifted directly with the tappet or the lifting movement of the pressure cheek to be initiated with a delay to the upward movement of the tappet.
  • the lifting or run-up movement of the pressure cheek is steamed before reaching the raised position. H. in a delayed motion.
  • DE-A-35 21 698 controls the run-up movement in the phases by means of a throttle valve between the oil reservoir and the space.
  • the respective instantaneous settings or pressure cheek and the throttle valve are queried.
  • These values, as well as the actual drawing pressure, are fed to a program-controlled comparator and compared with corresponding target values.
  • the comparator On the output side, the comparator is connected to a control device for the cushion pressure and, via a pilot control, to an actuating cylinder of the throttle valve.
  • the run-up movement of the pressure cheek in the individual movement phases is curve-guided in DE-A-35 05 984.
  • the piston rod of the ejector cylinder or locking cylinder is provided with a curve for setting the flow cross section of a pilot valve.
  • the control circuit for the startup according to the invention comes e.g. to be used in drawing apparatuses in which the drawing pressure - sheet metal holder force - is to be adjusted to the drawing conditions in the individual pressure points.
  • the object of the invention is to reduce the means.
  • the control circuit is intended on the one hand to achieve a stepless transition into and into the run-up phase, on the other hand the damping phase and the transition to the stop are to be uniformly delayed and without vibration.
  • the different drawing pressures of sheet metal parts to be shaped differently must be taken into account.
  • the ram curve in Fig. 1 is predetermined by the drive means of the press.
  • the path of the pressure cheek (3 in Fig. 3) is indicated with the ZE path.
  • the control circuit provides at bottom dead center UT, after the end of the pulling process, either bringing the pressure cheek 3 directly up with the upward movement of the ram or bringing it up with a delay.
  • the start of the start-up can be determined, for example, by means of electrical / electronic switching means and can open a valve or the 2-way valves 26 (FIGS. 2 + 3).
  • the indicated vaporization phase is indicated by
  • the reduction in cross-section in the outlet from the restricted spaces 9 to the reservoir 12 is effected by closing the valves 26 and the valves 17 of the parallel circuit 16. Inlet against the stop, represented by the ZE-OT line, is carried out by further reducing the cross-section, as explained in detail below becomes.
  • Fig. 2 shows the functional groups of the control of the drawing device 1.
  • single-acting pressure cylinders - air cylinders - are indicated with the locking cylinders 7 assigned to them.
  • the pressure cheek 3 is supported by these cylinders, and on the other hand, this causes the run-up movement.
  • a 2-way valve 26 e.g. a 2-way cartridge valve is switched, which is controlled from a common pilot control unit 31 all 2-way valves.
  • the control lines 37, 37 ' start from a common output of the pilot unit 31. The further positions not mentioned are explained below in relation to FIG. 3.
  • Fig. 3 the indicated pressure cheek 3 is supported by pressure cylinder 4.
  • the piston rods 8 are guided down through the locking cylinder 7 and carry pistons. At least one of the piston rods 8 also carries a group of switches 11 which can be set at the lower end region.
  • the parallel connection 16 comprises a number of 2-way valves 17, here three 2-way cartridge valves housed in a control block.
  • the control current connections 18 of these valves are connected via switchable directional valves 19 to the blocking space 9 of the blocking cylinder 7.
  • the working connection 21 is connected to the reservoir 12 via the drain line 20.
  • the working connection 22 is in direct connection with the blocking space 9.
  • Each of the blocking spaces 9 is also connected to the 2-way valve 26 or a 2-way cartridge valve.
  • the working connection 28 is connected directly to the blocking space 9.
  • the working connection 27 is directly connected to the reservoir 12 via the drain line 29.
  • the control current connection 30 can be pressurized by the pilot control unit 31.
  • the pilot control unit 31 is fluidly connected to one of the restricted spaces 9 through the pressure line 39.
  • the pressure in the blocking space 9 is applied via a directional valve 38 to the control flow connection 33 of a two-way valve 32, which can be a built-in directional valve.
  • the working connection 35 is connected to the drain line 20 leading to the reservoir 12.
  • the working connection 34 is flow-connected via the control lines 37, 37 'to the control current connections 30 of all 2-way valves 26.
  • a throttle check valve 36 is switched on in the pilot control unit 31. Between the pressure line 39 leading from the blocking space 9 to the directional control valve 38 and the line leading from the working connection 34 of the 2-way valve 32 to the throttle check valve 36 there is a flow connection through the connecting line 40, the check valve 41 and the throttle 42. The check valve 41 is turned on blocking direction 9.
  • the switches 11 can be actuated by means of cam control and thus directional valves 19 can be switched in the parallel connection 16.
  • the switching of these directional valves 19 from the shown in the possible switching position causes the opening of the 2-way valves 17 of the parallel circuit 16 and thus an increase in the flow cross section from the space 9 through the drain line 20.
  • the run-up of the pressure cheek 3 is thus freely adjustable, in particular The pressures set discretely in the individual drawing cylinders 4 can be dealt with. Low pulling forces require larger flow cross sections and vice versa.
  • the directional control valve 38 and, if required, the directional control valve 19 are switched to the positions shown via switches in the switch group 11.
  • the 2-way valves 1 and 26 close.
  • the 2-way valve 26 is provided with a damping pin 25 and, together with the pilot control unit 31 and the throttle 42 and throttle check valve 36 built therein, and the throttle check valve 36 determine a stepless, vibration-free decelerating braking operation into the stop ZE-OT.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Soil Working Implements (AREA)
  • Lifting Devices For Agricultural Implements (AREA)

Claims (3)

  1. Dispositif de régulation de la montée du plateau de poussée (3) d'un appareil d'emboutissage après l'emboutissage dans une presse d'emboutissage ou une presse ayant au moins un poste d'emboutissage, comportant des vérins de poussée (4) qui agissent sur le plateau de poussée (3) et, par celui-ci, sur des serre-flans dans l'outil, pour fournir la force de serrage de la tôle lors de l'emboutissage, des vérins de blocage (7) associés aux vérins de poussée (4) et pourvus de pistons (8) et de chambres de blocage (9) qui se remplissent chacune au moyen d'une soupape de remplissage (10) à partir d'un réservoir (12) au cours de l'emboutissage, ainsi que des vannes (17; 26) disposées en amont des chambres de blocage (9) et faisant varier la section d'écoulement à la sortie de chaque chambre de blocage (9) pendant la montée du plateau de poussée, ces vannes étant pilotées au cours du temps de telle sorte que le plateau de poussée (3) est levé tantôt en même temps que la montée du coulisseau, tantôt en retard par rapport à la montée du coulisseau et qu'un retard de l'arrivée du plateau de poussée (3) à son point mort supérieur est produit par une variation additionnelle de la section d' écoulement, caractérisé par un montage parallèle (16) d'au moins deux vannes à deux voies (17) qui est associé à chacune des chambres de blocage (9), où chacune de ces vannes à deux voies (17) peut être mise en communication avec la chambre de blocage (9) du vérin de blocage (7) par un premier raccord de commande (18) au moyen d'un distributeur (19) et communique directement avec le réservoir (12) par un premier raccord de travail (21) et avec la même chambre (9) du vérin de blocage (7) par un second raccord de travail (22), et caractérisé en outre par d'autres vannes à deux voies (26), associées à chaque montage parallèle (16), qui communiquent avec la chambre de blocage (9) d'un des vérins de blocage (7) par un premier raccord de travail (28) et avec le réservoir (12) par un second raccord de travail (27) et dont des raccords de commande (30) sont raccordés à une unité de pilotage commune (31), et par le fait que les distributeurs (19) disposés sur les conduits (23) allant aux premiers raccords de commande (18) et un distributeur (38) associé à l'unité de pilotage (31) sont commandés au cours du temps indépendamment les uns des autres en fonction de la montée du coulisseau.
  2. Dispositif selon la revendication 1, caractérisé en ce que l'unité de pilotage (31) comporte une vanne à deux voies (32) dont un raccord de commande (33) peut être mis en communication avec la chambre de blocage (9) d'un des vérins de blocage (7) au moyen du distributeur (38) et dont un premier raccord de travail (35) est connecté au réservoir (12) et l'autre raccord de travail (34) est connecté au raccord de commande (30) de chacune des vannes à deux voies (26) à travers une soupape de retenue à étranglement (36), et dans lequel est prévu un conduit de liaison (40) entre le conduit de pression (39) venant de la chambre de blocage (9) et un point situé en amont de la soupape de retenue à étranglement (36) sur le conduit de commande (37, 37') allant du premier raccord de travail (34) de la vanne à deux voies (32) aux raccords de commande (30) des vannes à deux voies (26), ledit conduit de liaison comportant un clapet anti-retour (41) qui bloque dans la direction de la chambre de blocage (9) et un étranglement (42).
  3. Dispositif selon la revendication 1 ou 2, caractérisé en ce que les vannes à deux voies (26) commandées par l'unité de pilotage (31) sont des vannes à pointeau amortisseur (25).
EP90112668A 1989-07-06 1990-07-03 Couplage de réglage pour la course supérieure pour la jumelle de pression d'un dispositif d'emboutissage Expired - Lifetime EP0406792B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3922212 1980-06-13
DE3922212A DE3922212A1 (de) 1989-07-06 1989-07-06 Regelschaltung fuer den hochlauf der druckwange eines ziehapparats

Publications (2)

Publication Number Publication Date
EP0406792A1 EP0406792A1 (fr) 1991-01-09
EP0406792B1 true EP0406792B1 (fr) 1994-04-27

Family

ID=6384416

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90112668A Expired - Lifetime EP0406792B1 (fr) 1989-07-06 1990-07-03 Couplage de réglage pour la course supérieure pour la jumelle de pression d'un dispositif d'emboutissage

Country Status (3)

Country Link
EP (1) EP0406792B1 (fr)
DE (2) DE3922212A1 (fr)
ES (1) ES2053020T3 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4129367A1 (de) * 1991-09-04 1993-03-11 Schuler Gmbh L Schaltungsanordnung zum regeln der geschwindigkeit eines druckzylinders
DE4218914A1 (de) * 1992-06-10 1993-12-16 Erfurt Umformtechnik Gmbh Hydraulische Zieheinrichtung in einer Presse
ITPD20050138A1 (it) * 2005-05-17 2006-11-18 Special Springs Srl Attrezzatura per il bloccaggio di un foglio di lamiera atto ad essere sagomato in una pressa
DE102019119392A1 (de) * 2019-07-17 2021-01-21 Moog Gmbh Vorrichtung und Verfahren zur Steuerung oder Regelung einer Bewegung eines Ziehkissens einer Ziehkissenpresse

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD227058A1 (de) * 1984-10-08 1985-09-11 Warnke Umformtech Veb K Anordnung zum regeln fuer steuerbare pneumatikkissen
DE3640788A1 (de) * 1986-11-28 1988-06-01 Schuler Gmbh L Zieheinrichtung fuer eine presse
DE3718159A1 (de) * 1987-05-29 1988-12-15 Schuler Gmbh L Ziehapparat an pressen
DE3735582C1 (de) * 1987-10-21 1988-04-28 Daimler Benz Ag Doppeltwirkende Presse zum Ziehen von Blechteilen

Also Published As

Publication number Publication date
ES2053020T3 (es) 1994-07-16
EP0406792A1 (fr) 1991-01-09
DE3922212A1 (de) 1991-01-17
DE59005507D1 (de) 1994-06-01

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