EP2158982B1 - Procédé et dispositif de contrôle du synchronisme d'unités de cylindre/pistons et de réduction des pics de pression lors du formage et/ou du découpage de précision sur des presses - Google Patents

Procédé et dispositif de contrôle du synchronisme d'unités de cylindre/pistons et de réduction des pics de pression lors du formage et/ou du découpage de précision sur des presses Download PDF

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Publication number
EP2158982B1
EP2158982B1 EP08014958A EP08014958A EP2158982B1 EP 2158982 B1 EP2158982 B1 EP 2158982B1 EP 08014958 A EP08014958 A EP 08014958A EP 08014958 A EP08014958 A EP 08014958A EP 2158982 B1 EP2158982 B1 EP 2158982B1
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EP
European Patent Office
Prior art keywords
pressure
piston
accumulator
ram
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.)
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Application number
EP08014958A
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German (de)
English (en)
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EP2158982A1 (fr
Inventor
Markus Dipl.-Ing. Schaltegger
Thomas Dipl.-Ing. Winkler
François Dipl.-Ing. Juhasz
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Feintool Intellectual Property AG
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Feintool Intellectual Property 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.)
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Publication date
Priority to PL08014958T priority Critical patent/PL2158982T3/pl
Application filed by Feintool Intellectual Property AG filed Critical Feintool Intellectual Property AG
Priority to AT08014958T priority patent/ATE497417T1/de
Priority to DE502008002530T priority patent/DE502008002530D1/de
Priority to EP08014958A priority patent/EP2158982B1/fr
Priority to MX2009008833A priority patent/MX2009008833A/es
Priority to JP2009190577A priority patent/JP5795141B2/ja
Priority to CA2676045A priority patent/CA2676045A1/fr
Priority to KR1020090078720A priority patent/KR101632746B1/ko
Priority to US12/583,748 priority patent/US8375765B2/en
Publication of EP2158982A1 publication Critical patent/EP2158982A1/fr
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Publication of EP2158982B1 publication Critical patent/EP2158982B1/fr
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/16—Control arrangements for fluid-driven presses
    • 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
    • B21D28/00—Shaping by press-cutting; Perforating
    • B21D28/02—Punching blanks or articles with or without obtaining scrap; Notching
    • B21D28/16—Shoulder or burr prevention, e.g. fine-blanking
    • 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
    • B21D28/00—Shaping by press-cutting; Perforating
    • B21D28/02—Punching blanks or articles with or without obtaining scrap; Notching
    • B21D28/20—Applications of drives for reducing noise or wear
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/16—Control arrangements for fluid-driven presses
    • B30B15/18—Control arrangements for fluid-driven presses controlling the reciprocating motion of the ram
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/16—Control arrangements for fluid-driven presses
    • B30B15/22—Control arrangements for fluid-driven presses controlling the degree of pressure applied by the ram during the pressing stroke
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/26—Programme control arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/024—Installations or systems with accumulators used as a supplementary power source, e.g. to store energy in idle periods to balance pump load
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/21—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge
    • F15B2211/212—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge the pressure sources being accumulators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/505—Pressure control characterised by the type of pressure control means
    • F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
    • F15B2211/50518—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using pressure relief valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/625—Accumulators

Definitions

  • the invention relates to a method for controlling the synchronization of cylinder / piston units for counter-holder and / or ring teeth and for pressure peak reduction during fine blanking and / or forming of workpieces on a equipped with at least one tool press, wherein the cylinder / piston unit with the control pressure of a hydraulic fluid acted upon and the press ram is driven mechanically or hydraulically.
  • the invention further relates to a device for controlling a piston / cylinder unit for counter-holder and ring teeth and for pressure peak reduction in the fine blanking of workpieces for carrying out the method with a press, with at least one of Upper part and lower part existing tool is equipped, the at least one piston / cylinder unit of the press for at least one counter-holder and / or serration of the tool and a plunger of the press are assigned, and connected to the piston / cylinder unit hydraulic system having a memory for the storage of Hydraulic fluid, hydraulic lines for supplying and discharging the hydraulic fluid to and from the piston / cylinder unit, controllable control means for opening and closing the hydraulic lines and a control unit for driving the control means, wherein the press ram is either integrated into the hydraulic system or connected to a separate drive system ,
  • a method and such a device are for example in DE-A-10252625 disclosed.
  • fine-blanking presses are characterized by the fact that counter-holders and ring teeth function as controlled axes and reach their limits in terms of process technology at high speeds and at high speeds.
  • the occurrence of pressure peaks when punching or cutting on presses is also known.
  • Pressure surges occur, for example, in the so-called cutting stroke, which always occurs when the cutting punch from the workpiece emerges and the resistance of the material suddenly disappears, or on impact of the cutting punch on the clamped between the upper part and lower part of the tool workpiece.
  • the DE 26 21 726 A1 describes a device for preventing the cutting blow on cutting presses with at least one cylinder-piston unit which is arranged between a tool base plate and a press ram with adjustable height of an impact surface for the press ram, wherein the stroke of the piston on the one hand by a provided on the cylinder collar and on the other hand by the end face of the piston opposite inner end wall of the cylinder is limited, and wherein the pressure medium space between the end face of the piston and the end wall of the cylinder in the inlet direction is connected via a check valve with a high-pressure fluid source and in the outlet direction of a pressure relief valve is connected.
  • the pressure limiting valve is provided with a control chamber, which is in communication with the high-pressure fluid source, wherein the pressure in the control chamber via a control line by means of a central pressure control valve adjustable. Also, this known prior art is not suitable to reduce or prevent the pressure surge when hitting punch on the workpiece, so that the disadvantages described above also occur in this known solution.
  • the present invention seeks to provide a method and apparatus for controlling the synchronism of cylinder / piston units and at least one main tappet and for pressure peak reduction during forming and / or fine blanking for presses, the recoil due to the impact of cutting punch on the workpiece independently derived from the regulation of the working pressure of the hydraulic fluid and the synchronous characteristics of the cylinder / piston units and the main plunger are significantly improved by a constant pressure curve in the hydraulic system even at high cycle times and speeds.
  • the method according to the invention is characterized in that initially the cylinder / piston units are constantly kept under a presettable pad pressure by a first pressure accumulator supplied by a low pressure source, and then the cylinder / piston units are switched by a selectable high pressure source under a presettable positive pressure are set, which is set to a varying between padding pressure and pressure for forming and / or cutting pressure by supplying a separate amount of control oil in a second memory via a central control unit, wherein a pressure increase upon impact of tool and workpiece by deriving a substantial part of Pressure pulse is compensated in a separate tank volume independent of the pressure to a permissible target pressure, and that is carried out by the applied cushioning pressure ejection of the workpiece in synchronism with the retraction of the plunger.
  • the first accumulator is first charged in rapid traverse of the plunger to the upholstery pressure corresponding to the clamping force of the workpiece in the die of the tool, which is equal to the ejector force of the counterholder.
  • the cylinder / piston unit is charged by a high pressure source to the displacement pressure, the height of which is predetermined by a proportional pressure valve.
  • An independent of the first memory second memory is then charged by a separate amount of control oil to a pressure that must apply the counter-holder and / or the ring teeth during forming.
  • the anvil and / or the ring point proceed with the low pressure from the accumulator.
  • the hydraulic high-pressure source is switched on and the counter-holder and / or the rag are charged to the displacement pressure.
  • the resulting pressure peaks in a separate tank up to a preselected set pressure presumed.
  • the counter-holder and / or the ring point are displaced and the cylinder / piston unit of the counter-holder and / or the ring point relieved to the pad pressure.
  • the synchronous ejection of the counter-holder and / or the annular prong takes place, wherein the return speed of the plunger has a value which is equal to the ejector speed of the counter-holder.
  • the method according to the invention has the particular advantage that the counter-holder and / or ring-shaped teeth can move synchronously with or against the tappet profile, without causing a break-off or an increase in the force exerted by the piston.
  • the control is quantity-independent, which leads to more constant pressure profiles even under different conditions. Especially at high displacement pressures and / or long hydraulic lines, the displacement pressure remains stable, ie, despite a decrease in the pressure in the memory, the control pressure in the displacement valve remains constant due to the external control oil supply.
  • the control pressure supply from the separate circuit makes it possible to provide the maximum displacement force for the counter-holder and / or the ring point even at low press force preselection.
  • Another advantage is that the method according to the invention is equally suitable for both hydraulically and mechanically driven presses.
  • the inventive device is simple and compact and has the great advantage that the cylinder / piston unit is connected to two independent hydraulic circuits.
  • the cylinder / piston unit is connected on the one hand with a held by a low pressure source under low pressure pad pressure circuit and on the other hand connected to a high-pressure displacement circuit switched.
  • the cushion pressure circuit constantly sets the cylinder / piston unit under a pressure equal to the ejector force of the counter-holder, and the displacement circuit exerts a force on the counter-holder and / or the ring point with a pressure which is substantially constant.
  • the cylinder / piston unit is connected to the low pressure source via a programmable by a control unit first proportional valve to a first memory for generating a predetermined by the proportional valve, constantly applied to the piston / cylinder unit cushioning pressure.
  • the high pressure source is connected to the piston / cylinder unit via a proportional valve pilot operated by the control unit and a second accumulator for generating pressure for the anvil and / or the tine, the proportional directional valve communicating with a separate tank for discharging pressure spikes stands.
  • the second reservoir is connected to a pilot oil pump which delivers hydraulic fluid to the second reservoir to maintain the pressure in the second reservoir constant.
  • the inventive method and the Device according to the invention are characterized by an extensive synchronization of the cylinder / piston units with the plunger of the press, so that high cycle numbers and speeds can be achieved.
  • the sensitivity to pressure spikes when hitting the tool on the workpiece is massively reduced, so that deformation, quality degradation and tool wear can be significantly minimized even at the higher speeds.
  • Fig. 1 a schematic representation of the process step "pad pressure"
  • Fig.2 a schematic representation of the process step "supercharger pressure charging"
  • Fig. 3 a schematic representation of the "process step fine blanking / forming"
  • Fig. 4 a schematic representation of the process step "displacement at top dead center"
  • Fig. 5 a schematic representation of the process step "synchronous ejection”.
  • the Fig. 1 shows the basic structure of the device according to the invention, with which the method according to the invention on a press for forming / fine blanking of parts to be executed.
  • the cylinder / piston unit 1 has, for example, a piston 3 arranged in a counter-holding cylinder 2.
  • the working space 5 of the cylinder / piston unit 1 is connected by a hydraulic line 7 to a low-pressure source 8.
  • the hydraulic line 7 leads via a proportional pressure valve 9, a first reservoir 10 and a check valve 11 to the cylinder / piston unit 1.
  • the proportional pressure valve 9 is also connected to a central control unit 12, with which the proportional pressure valve 9 to a corresponding pad pressure P1 is programmed.
  • the piston 3 of the counter-holding cylinder 2 of the press is in rapid traverse, ie the piston initially moves from bottom dead center UT in the direction of top dead center TDC.
  • Low-pressure source 8, proportional pressure valve 9, memory 10, check valve 11 and the associated hydraulic line 7 form the hydraulic pad pressure circuit A for the cylinder / piston unit first
  • the working space 5 cylinder / piston unit 1 is also connected to a high-pressure source 13 via a two-way valve 14 through a hydraulic line 15. With the two-way valve 14, the high-pressure source 13 can be switched to the working space 5.
  • the hydraulic line 7 is blocked in this case by the check valve 11, so that the Low pressure source 8 is safely separated from the high pressure source 13.
  • the hydraulic line 7 leads upstream to a 4-way piston valve 16, for example, proportional directional valve, which pre-controls a second proportional pressure valve 17 to a certain allowable setpoint pressure SP.
  • the proportional pressure valve 17 is connected on the input side via a hydraulic line 18 to a second memory 19, which is supplied by a separate control oil pump 20 with control oil.
  • the 4-way piston valve 16 is connected via a hydraulic line 21 to a separate tank 22, which receives the displaced by the pressure peaks hydraulic fluid.
  • High-pressure source 13, two-way valve 14, 4-way piston valve 16, proportional pressure valve 17, second memory 19 and the associated hydraulic lines 18 form the hydraulic Verdrängerdrucknikmaschinelauf B for the cylinder / piston unit. 1
  • the memories 10 and 19 are designed as bladder memories.
  • the inventive method runs in the following in Fig. 1 to 4 shown steps as follows.
  • the plunger of the cylinder / piston unit 1 is located near the bottom dead center and is in rapid traverse.
  • the first reservoir 10 is charged via the low-pressure source 8 to a cushioning pressure P1 corresponding to the clamping force of the workpiece, which is equal to the ejector force of the counter-holder.
  • the cushion pressure P1 acts on the working space 5 of the counter-holding cylinder and the counter-holder moves under the pending low pressure in the top dead center OT.
  • the second reservoir 19 is charged to the displacer pressure P2, which is predetermined via the proportional pressure valve 17.
  • the high-pressure hydraulic fluid of the high-pressure source 13 is switched to the working space 3 by switching the two-way valve 14, which is in the closed position in the first step. It begins charging the working chamber 5 to the predetermined by the proportional pressure valve 17 displacement pressure P2.
  • the proportional pressure valve 17 is adjusted by the central control unit 12 accordingly.
  • the anvil is thus under the action of the positive pressure P2.
  • the two-way valve 14 closes by a corresponding command of the control unit 12th
  • the Fig. 3 schematically illustrates the third step of the method.
  • the two-way valve 14 has separated the high pressure source 13 by switching.
  • the positive pressure P2 acting on the anvil is in hydraulic equilibrium with the pressure generated in the second reservoir 19 and may assume values between the cushion pressure and the pressure PU required for forming or fine blanking.
  • the tool for example the punch, strikes the workpiece, for example a strip material.
  • the pressure pulse produced by the pressure peak passes via the hydraulic line 7 to the 4-way piston valve 16, which regulates the pressure pulse to a permissible desired pressure SP and via the hydraulic line 21 into the tank 21.
  • the effect of the resulting pressure peak on the workpiece is thereby reduced.
  • the pressure in the second reservoir 19 is kept substantially constant by supplying a corresponding amount of control oil by means of the control oil pump 20 from a separate control oil source.
  • Fig. 4 is the plunger of the anvil cylinder 2 of the cylinder / piston unit 1 in the fourth step in the top dead center TDC.
  • the counterpart is displaced.
  • the discharge of the working space 5 or 6 from the positive pressure P2 is possible only up to the still applied pad pressure P1 from the first memory 10.
  • the cushion pressure P1 thus constantly acts on the working space 5.
  • the cylinder / piston unit 1 behaves like a mechanical spring, so that it can move against or in the direction of the plunger movement.
  • the fifth process step is in Fig. 5 shown.
  • the ejector speed of the counter-holder must be set so that the return speed of the plunger is equal to the ejector speed.
  • the Auswerferkraft must further the holding force of the Workpiece in the die correspond. If the ejector speed is too low, the workpiece moves away from the strip of material because the ejector force is set too low. If, on the other hand, the ejector speed is too high, the workpiece is pressed into the strip and thereby damaged, because the ejector force is set too large. Therefore, for the ejection synchronous with the retraction of the plunger, the precise adjustment of the cushion pressure P1 is of primary importance. This means that the proportional pressure valve 9 must be preset by central control unit 12 accordingly.
  • Cylinder / piston unit 1 Counter-holder cylinder 2 piston 3 workrooms 5 hydraulic line 7 Low pressure source 8th Proportional pressure valve in Padded pressure circuit A 9 First store 10 check valve 11 Central control unit 12 High pressure source 13 Two-way valve 14 hydraulic line 15 4-way piston valve 16 Proportional pressure valve in Displacement pressure circuit B 17 hydraulic line 18 Second memory 19 Control oil pump 20 hydraulic line 21 tank 22 Cushion pressure circuit A Verdrängertiknikank B Top Dead Center OT Bottom dead center UT cushion pressure P1 Displacement pressure in the working space 5 P2 Displacer pressure in the second memory P3 Pressure for forming / fine blanking PU set pressure SP

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Presses (AREA)
  • Presses And Accessory Devices Thereof (AREA)
  • Actuator (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Compressor (AREA)

Claims (10)

  1. Procédé destiné au contrôle du synchronisme d'unités de cylindres/pistons pour fond de matrice et/ou anneau de retenue ainsi qu'à la réduction des pics de pression lors du découpage de précision et/ou du formage de pièces sur une presse équipée d'au moins un outil, dans lequel procédé l'unité de cylindres/pistons est mise sous pression de contrôle d'un liquide hydraulique et le coulisseau de presse est entraîné mécaniquement ou hydrauliquement, caractérisé en ce que l'unité de cylindres/pistons est d'abord maintenue constamment par un premier accumulateur hydraulique, alimenté par une source de basse pression, sous une pression-tampon (P1) pré-réglable et en ce que l'unité de cylindres/pistons est ensuite mise, par une source de haute pression pouvant être mise en circuit, sous une pression de déplacement (P2) pré-réglable, laquelle pression de déplacement est réglée à une pression (PU) variant entre la pression-tampon (P1) et la pression de formage et/ou découpage par l'amenée d'une quantité à part d'huile de contrôle dans un second accumulateur par l'intermédiaire d'une unité de contrôle centrale, une montée en pression produite lors de l'impact de l'outil et de la pièce étant réglée à une pression nominale admissible par déviation d'une partie essentielle de l'impulsion de pression dans un réservoir séparé, indépendamment de la quantité de pression (P3), dans le second accumulateur, et en ce qu'en raison de la pression-tampon appliquée, une éjection de la pièce est réalisée de manière synchrone au recul du coulisseau.
  2. Procédé selon la revendication 1, caractérisé par les étapes suivantes
    a) charge du premier accumulateur, en avance rapide du coulisseau, à la pression-tampon P1 concordant avec la force de serrage de la pièce dans la matrice de l'outil, la pression-tampon étant égale à la force d'éjection du fond de matrice ;
    b) charge du second accumulateur, dépendant du premier accumulateur, au moyen d'une pompe à part à huile de contrôle, à la pression de déplacement (P3) que le fond de matrice resp. l'anneau de retenue doit fournir lors du formage ;
    c) sortie du fond de matrice avec basse pression ;
    d) mise en circuit de la source de haute pression hydraulique et charge du fond de matrice resp. de l'anneau de retenue à la pression de déplacement (P2);
    e) déviation des pics de pression, produits lors de l'impact du poinçon sur la pièce, dans le réservoir à part jusqu'à la pression nominale (PS) prédéfinie comme admissible ;
    f) déplacement du fond de matrice resp. de l'anneau de retenue et décharge des cylindres du fond de matrice resp. de l'anneau de retenue jusqu'à la pression P1 suivant l'étape a) ;
    g) éjection synchrone du fond de matrice lors du recul du coulisseau, la vitesse de recul du coulisseau étant réglée sur une valeur qui est égale à la vitesse d'éjection du fond de matrice.
  3. Procédé selon les revendications 1 et 2, caractérisé en ce que la pression (P1) dans le premier accumulateur est réglée au moyen d'une soupape de pression proportionnelle qui est programmable au moyen d'une unité de commande centrale.
  4. Procédé selon les revendications 1 et 2, caractérisé en ce que la pression de déplacement (P3) dans le second accumulateur est réglée au moyen d'une autre soupape proportionnelle (Y2) pré-contrôlée par une soupape à piston (Y4).
  5. Procédé selon les revendications 1, 2 et 4, caractérisé en ce que la pression nominale (PS) lors de l'impact de l'outil sur la pièce est réglée au moyen d'une soupape à piston à 4 voies.
  6. Procédé selon la revendication 5, caractérisé en ce qu'une soupape de distribution proportionnelle est utilisée comme soupape à piston à 4 voies (Y4), laquelle, lors de l'impact de l'outil sur la pièce, règle la montée en pression à la pression nominale préréglée, de sorte que la pression (P3) reste essentiellement constante.
  7. Procédé selon la revendication 1, caractérisé en ce que la source hydraulique de haute pression est mise en circuit au moyen d'une soupape à deux voies (Y3), une fois que la pression P1 est obtenue dans le premier accumulateur.
  8. Procédé selon la revendication 1, caractérisé en ce que des accumulateurs à bulles sont utilisés comme accumulateurs.
  9. Dispositif destiné au contrôle d'une unité de cylindres/pistons pour fond de matrice et anneau de retenue ainsi qu'à la réduction des pics de pression lors du découpage de précision de pièces pour la réalisation du procédé selon la revendication 1, comprenant une presse de découpage de précision, qui est équipée d'au moins un outil constitué d'une partie supérieure et d'une partie inférieure, auquel sont attribués au moins une unité de pistons/cylindres de la presse pour au moins un fond de matrice et/ou un anneau de retenue de l'outil ainsi qu'un coulisseau de la presse, et comprenant un système hydraulique raccordé à l'unité de pistons/cylindres, lequel comprend un accumulateur pour la mise en réserve de liquide hydraulique, des conduites hydrauliques pour alimenter et évacuer le liquide hydraulique vers et en provenance de l'unité de pistons/cylindres, des moyens de réglage contrôlables destinés à ouvrir et fermer les conduites hydrauliques, et une unité de commande destinée à commander les moyens de réglage, le coulisseau de presse étant raccordé soit dans le système hydraulique soit à un système d'entraînement séparé, caractérisé en ce que l'unité de cylindres/pistons (1) est raccordée à un premier accumulateur (10), destiné à générer une pression-tampon prédéfinie (P1) par la soupape de pression proportionnelle (9) et appliquée en permanence sur l'unité de pistons/cylindres (1) par l'intermédiaire d'une soupape à deux voies (14), à l'aide d'une source de basse pression (8) par l'intermédiaire d'une première soupape de pression proportionnelle (9) programmable par une unité de commande (12), laquelle soupape à deux voies met en circuit l'unité de cylindres/pistons (1) à une source de haute pression (13), pouvant être fermée, pour charger l'unité de cylindres/pistons (1) à une pression de déplacement (P2), et en ce que l'unité de pistons/cylindres (1) est raccordée à un second accumulateur (19), destiné à générer une pression de déplacement (P3) agissant sur le fond de matrice/l'anneau de retenue, par l'intermédiaire d'une soupape de pression proportionnelle (17) programmable par l'unité de commande (12) et pré-contrôlée à la pression nominale (SP) par une soupape à pistons à 4 voies (16), la soupape à pistons à 4 voies (16) communiquant avec un réservoir séparé (22) pour dévier les pics de pression produits par l'impact de l'outil sur la pièce, et en ce que le second accumulateur (19) est raccordé à la pression de déplacement appliquée (P2) au moyen de la soupape à deux voies (14) de sorte à pouvoir être mis en circuit à l'unité de pistons/cylindres (1) placée sous la pression-tampon (P1), un clapet anti-retour (11) séparant le premier accumulateur (10) de la source de haute pression (13).
  10. Dispositif selon la revendication 9, caractérisé en ce que les accumulateurs (10 ; 19) sont des accumulateurs à bulles.
EP08014958A 2008-08-25 2008-08-25 Procédé et dispositif de contrôle du synchronisme d'unités de cylindre/pistons et de réduction des pics de pression lors du formage et/ou du découpage de précision sur des presses Active EP2158982B1 (fr)

Priority Applications (9)

Application Number Priority Date Filing Date Title
AT08014958T ATE497417T1 (de) 2008-08-25 2008-08-25 Verfahren und vorrichtung zum steuern des gleichlaufs von zylinder/kolbeneinheiten und zur druckspitzenreduzierung beim umformen und/oder feinstanzen auf pressen
DE502008002530T DE502008002530D1 (de) 2008-08-25 2008-08-25 Verfahren und Vorrichtung zum Steuern des Gleichlaufs von Zylinder/Kolbeneinheiten und zur Druckspitzenreduzierung beim Umformen und/oder Feinstanzen auf Pressen
EP08014958A EP2158982B1 (fr) 2008-08-25 2008-08-25 Procédé et dispositif de contrôle du synchronisme d'unités de cylindre/pistons et de réduction des pics de pression lors du formage et/ou du découpage de précision sur des presses
PL08014958T PL2158982T3 (pl) 2008-08-25 2008-08-25 Sposób i urządzenie do sterowania synchroniczną pracą jednostek cylindrowo-tłokowych i do redukowania szczytów ciśnieniowych podczas przeróbki plastycznej i/lub precyzyjnego tłoczenia/wykrawania na prasach
MX2009008833A MX2009008833A (es) 2008-08-25 2009-08-18 Procedimiento y dispositivo para controlar la sincronizacion de unidades de cilindros/embolos y para la reduccion de los picos de presion en el caso de moldeado y/o estampado fino en prensas.
JP2009190577A JP5795141B2 (ja) 2008-08-25 2009-08-20 シリンダ／ピストンユニットの同期を制御し、プレス機での変形および／または精密打抜きの際の圧力ピークを減らすための方法及び装置
CA2676045A CA2676045A1 (fr) 2008-08-25 2009-08-20 Methode et dispositif permettant de commander la synchronisation des cylindres/pistons et de reduire les pics de pression lors de la formation et/ou du decoupage de precision sur une presse de decoupage de precision ou une presse a estampes
KR1020090078720A KR101632746B1 (ko) 2008-08-25 2009-08-25 실린더/피스톤 유닛의 동기화를 제어하고 정밀 블랭킹 또는 스탬핑 프레스에서의 성형 및/또는 정밀 블랭킹 도중의 압력 피크를 감소시키기 위한 방법 및 장치
US12/583,748 US8375765B2 (en) 2008-08-25 2009-08-25 Method and device for controlling the synchronization of cylinder/piston units and for reducing pressure peaks during forming and/or fineblanking on a fineblanking or stamping press

Applications Claiming Priority (1)

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EP08014958A EP2158982B1 (fr) 2008-08-25 2008-08-25 Procédé et dispositif de contrôle du synchronisme d'unités de cylindre/pistons et de réduction des pics de pression lors du formage et/ou du découpage de précision sur des presses

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EP2158982A1 EP2158982A1 (fr) 2010-03-03
EP2158982B1 true EP2158982B1 (fr) 2011-02-02

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CA (1) CA2676045A1 (fr)
DE (1) DE502008002530D1 (fr)
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ATE497417T1 (de) 2011-02-15
CA2676045A1 (fr) 2010-02-25
JP5795141B2 (ja) 2015-10-14
DE502008002530D1 (de) 2011-03-17
EP2158982A1 (fr) 2010-03-03
US20100043519A1 (en) 2010-02-25
JP2010046716A (ja) 2010-03-04
US8375765B2 (en) 2013-02-19
KR101632746B1 (ko) 2016-06-22
MX2009008833A (es) 2010-03-22
PL2158982T3 (pl) 2011-07-29
KR20100024374A (ko) 2010-03-05

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