EP3338909B1 - Dispositif d'estampage - Google Patents

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Publication number
EP3338909B1
EP3338909B1 EP17208876.7A EP17208876A EP3338909B1 EP 3338909 B1 EP3338909 B1 EP 3338909B1 EP 17208876 A EP17208876 A EP 17208876A EP 3338909 B1 EP3338909 B1 EP 3338909B1
Authority
EP
European Patent Office
Prior art keywords
hydraulic
forging
drive
cushion
lift drive
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.)
Active
Application number
EP17208876.7A
Other languages
German (de)
English (en)
Other versions
EP3338909A1 (fr
Inventor
Robert Koppensteiner
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.)
GFM GmbH
Original Assignee
GFM GmbH
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Filing date
Publication date
Application filed by GFM GmbH filed Critical GFM GmbH
Publication of EP3338909A1 publication Critical patent/EP3338909A1/fr
Application granted granted Critical
Publication of EP3338909B1 publication Critical patent/EP3338909B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J9/00—Forging presses
    • B21J9/10—Drives for forging presses
    • B21J9/18—Drives for forging presses operated by making use of gearing mechanisms, e.g. levers, spindles, crankshafts, eccentrics, toggle-levers, rack bars
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J7/00—Hammers; Forging machines with hammers or die jaws acting by impact
    • B21J7/20—Drives for hammers; Transmission means therefor
    • B21J7/22—Drives for hammers; Transmission means therefor for power hammers
    • B21J7/28—Drives for hammers; Transmission means therefor for power hammers operated by hydraulic or liquid pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J9/00—Forging presses
    • B21J9/10—Drives for forging presses
    • B21J9/12—Drives for forging presses operated by hydraulic or liquid pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B1/00—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen
    • B30B1/26—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by cams, eccentrics, or cranks
    • B30B1/263—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by cams, eccentrics, or cranks work stroke adjustment means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B1/00—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen
    • B30B1/26—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by cams, eccentrics, or cranks
    • B30B1/265—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by cams, eccentrics, or cranks using a fluid connecting unit between drive shaft and press ram

Definitions

  • the invention relates to a forging device with at least one longitudinally guided forging punch, with a mechanical lifting drive for the forging punch, which is mounted displaceably in relation to the mechanical lifting drive, and with a hydraulic cushion which is arranged between the forging punch and the mechanical lifting drive and is connected to a hydraulic line provided with a control valve. which has at least one hydraulic cylinder, the pressure chamber of which is connected to the hydraulic cushion via the hydraulic line.
  • a shifting clutch in the drive train or an additional hydraulic drive connected via a hydraulic line to the hydraulic cylinder between the forging punches and their mechanical drives is provided, between which and the hydraulic cylinder hydraulic medium is pumped back and forth in order to lift of the mechanical lifting drive same but opposite stroke of
  • Hydraulic cylinder to prevent the effect of the mechanical lifting drive on the forging die.
  • this requires a complex hydraulic system.
  • the invention is therefore based on the object of designing a forging device with forging punches supported on mechanical lifting drives via hydraulic cushions in such a way that, with comparatively little design effort, not only the stroke position, but also in particular the stroke amplitude and the deformation rate can be influenced in a variety of ways.
  • the additional hydraulic drive consists only of at least one hydraulic cylinder, the pressure chamber of which is connected to the hydraulic cushion via the hydraulic line, the piston of this hydraulic cylinder being actuated as a function of the lifting movement of the mechanical lifting drive and the travel caused by the capacity of the pressure chamber of the hydraulic cylinder of the hydraulic cushion is smaller than the stroke of the mechanical lifting drive, the design effort is significantly reduced due to the omission of a separate hydraulic fluid system.
  • the hydraulic medium is only conveyed back and forth between the hydraulic cushion and the hydraulic cylinder depending on the activation of the control valve, which means that the mechanical lifting drive is superimposed by a hydraulic drive, because the hydraulic drive between the forging die and the mechanical lifting drive can be built up and dismantled Hydraulic cushion is effective as a lifting drive, with the help of which the stroke amplitude and the deformation rate during the forging stroke can be influenced in particular.
  • the volume of the pressure chamber of the hydraulic cylinder is decisive for the adjustment size of the hydraulic cushion.
  • the amplitude of the forging stroke must therefore be reduced by moving the hydraulic medium from the Hydraulic cushion in the pressure chamber of the hydraulic cylinder-related adjustment path of the forging stamp correspond to the reduction in the amplitude of the mechanical lifting drive.
  • the mechanical lifting drive comprises an eccentric drive with a sliding block which is rotatably mounted on the eccentric and which acts on the piston of the hydraulic cylinder with a sliding surface facing away from the forging die. If in this case the hydraulic line is released by the control valve, the eccentric drive forces hydraulic medium out of the hydraulic cushion into the hydraulic cylinder, the piston of which is released by the sliding block of the eccentric drive, so that the pressure chamber of the hydraulic cylinder decreases according to the amount of oil displaced from the hydraulic cushion increased by a piston adjustment. The synchronization of the piston actuation of the hydraulic cylinder with the eccentric drive is therefore specified.
  • the adjustment size of the hydraulic cushion that is possible in each case depends on the capacity of the pressure chamber of the hydraulic cylinder.
  • the hydraulic line of the hydraulic cushion can be connected via a respective control valve to a plurality of hydraulic cylinders which can be actuated as a function of the lifting movement of the mechanical lifting drive.
  • particularly advantageous conditions arise when the hydraulic cylinders have pressure chambers with different hydraulic volumes, so that different displacement volumes can be made available for the hydraulic medium from the hydraulic cushion by activating individual hydraulic cylinders.
  • the hydraulic cylinders can have a common, stepped housing with a stepped piston which is acted upon as a function of the lifting movement of the mechanical lifting drive.
  • a stepped piston is acted upon by the sliding block via its sliding surface facing away from the forging die.
  • the forging punch By supplying and discharging certain amounts of hydraulic fluid, the forging punch is displaced in relation to the mechanical lifting drive via the hydraulic cushion, which, when using servo valves as control valves, creates the possibility of reducing the speed of the forging punch during the working stroke compared to the speed profile specified by the mechanical lifting drive and thus the deformation speed to change, which, however, can cause considerable stress on the control valves.
  • the mechanical lifting drive can be driven by an electric servo motor, which allows the speed profile to be changed over the stroke of the mechanical lifting drive independently of the control of the hydraulic cushion.
  • the forging device comprises a forging die 2, which is guided longitudinally in a housing 1 and forms a receptacle 3, indicated purely schematically, for a forging tool, as well as a mechanical one Lifting drive 4, which is designed as an eccentric drive with an eccentric 5 and a sliding block 6 mounted on the eccentric.
  • the sliding block 6 does not act directly on the forging punch 2 with its sliding surface 7 facing the forging punch 2, but via a hydraulic cushion 8, which is determined by the pressure chamber of a cylinder 9, which is guided in the housing 1 and can be displaced coaxially with the forging punch 2, into which the forging punch 2 engages with its end forming a piston 10 .
  • the hydraulic cushion 8 is connected via a hydraulic line 11 and a control valve 12 to the pressure chamber 13 of a hydraulic cylinder 14 , the piston 15 of which is supported on the sliding surface 16 of the sliding block 6 facing away from the forging die 2 .
  • the piston 15 is pressed against the sliding block 6 in a resilient manner.
  • the hydraulic cylinder 14 is connected to a pressure accumulator 18 via a switching valve 17, which causes the piston 15 to be acted upon by a hydraulic spring.
  • the system of the cylinder 9 for the hydraulic cushion 8 on the sliding block 6 is ensured in a similar way.
  • the forging punch 2 is supported on auxiliary pistons 19 which are acted upon by a hydraulic medium from a pressure accumulator, so that the forging punch 2 is held in contact with the sliding block 6 by means of a hydraulic spring with the hydraulic cushion 8 being interposed.
  • the forging punch 2 is driven exclusively via the eccentric drive 4 .
  • the height of the hydraulic cushion 8 determines the stroke position of the forging punch 2. Since an exchange of hydraulic fluid between the hydraulic cushion 8 and the hydraulic cylinder 14 is prevented when the control valve 12 is closed, the piston 15 must be pressurized via the pressure accumulator 18 in order to ensure that the piston 15 rests on the Sliding surface 16 of the sliding block 6 to secure. To do this, the switching valve 17 must be opened.
  • the displacement of the hydraulic medium from the hydraulic cushion 8 into the pressure chamber 13 of the hydraulic cylinder 14 reduces the height of the hydraulic cushion 8 and thus influences the actuating movement of the forging punch 2, the working stroke of which is reduced by the hydraulic cushion 8 in accordance with the actuating movement superimposed on the working stroke of the eccentric drive 4 .
  • the hydraulic medium is again displaced from the pressure chamber 13 of the hydraulic cylinder 14 into the hydraulic cushion 8.
  • control valve 12 is designed as a servo valve
  • the hydraulic medium flow between the hydraulic cushion 8 and the hydraulic cylinder 14 can be controlled, which allows the speed of the forging punch 2 to be changed during the working stroke and thus the deformation speed to be influenced.
  • Appropriate loading of the hydraulic cushion 8 also makes it possible to influence the stroke frequency, as is known per se. However, it is not only possible to reduce the stroke frequency, but also to double the stroke frequency of the forging punch 2 if the volumes of the hydraulic cushion 8 and the hydraulic cylinder 14 are adjusted and mutually coordinated and the hydraulic cushion 8 and the pressure accumulator 17 are controlled accordingly, if the Pressure accumulator 17 provides sufficient hydraulic fluid for an additional working stroke of the forging die 2 during the idle stroke of the mechanical lifting drive.
  • the embodiment after 2 differs from the after the 1 only in that the hydraulic cushion 8 interacts with a plurality of hydraulic cylinders 14 which are each connected to the hydraulic line 11 of the hydraulic cushion 8 via separately controllable control valves 12 .
  • a common, stepped housing 20 with a stepped piston 21 which cooperates with the individual hydraulic cylinders 14 piston sections forms. Since the pressure chambers 13 of the individual hydraulic cylinders 14 have different absorption volumes, the activation of the individual hydraulic cylinders 14 makes it possible to convey hydraulic medium back and forth in different quantities between the hydraulic cushion 8 and the individual hydraulic cylinders 14, which has a graduated influence on the movement of the forging punch 2 and thus allows a good adaptation of the forging device to different forging tasks. A further influence on the rate of deformation arises when the eccentric shaft of the eccentric drive 4 is driven by an electric servomotor, with the help of which the rotational speed for the eccentric 5 and thus the progression of the lifting speed can be controlled.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
  • Presses And Accessory Devices Thereof (AREA)

Claims (7)

  1. Dispositif de forgeage avec au moins un poinçon de forgeage (2) guidé longitudinalement, avec un actionneur de levage mécanique pour le poinçon de forgeage (2) monté de manière coulissante par rapport à l'actionneur de levage mécanique et avec un coussinet hydraulique (8) disposé entre le poinçon de forgeage (2) et l'actionneur de levage mécanique qui est raccordé à une conduite hydraulique (11) dotée d'une vanne de commande (12) d'un actionneur hydraulique qui comporte au moins un vérin hydraulique (14) dont la chambre de pression (13) est reliée par la conduite hydraulique (11) avec le coussinet hydraulique (8), caractérisé en ce que le piston (15) du vérin hydraulique (14) peut être actionné en fonction du mouvement de levage de l'actionneur de levage mécanique et que la course de réglage du coussinet hydraulique (8) conditionnée par la contenance de la chambre de pression (13) du vérin hydraulique (14) est plus courte que la course de levage de l'actionneur de levage mécanique.
  2. Dispositif de forgeage selon la revendication 1, caractérisé en ce que l'actionneur de levage mécanique comprend un mécanisme è excentrique (4) avec un coulisseau (6) monté de façon rotative sur l'excentrique (5) qui presse avec une surface de contact (16) opposée au poinçon de forgeage (2) le piston (15) du vérin hydraulique (14).
  3. Dispositif de forgeage selon la revendication 1 ou 2, caractérisé en ce que la conduite hydraulique (11) du coussinet hydraulique (8) est reliée par une vanne de commande (12) avec chacun d'une pluralité de vérins hydrauliques (14) actionnables en fonction du mouvement de levage de l'actionneur de levage mécanique.
  4. Dispositif de forgeage selon la revendication 3, caractérisé en ce que les vérins hydrauliques (14) présentent des chambres de pression (13) avec des volumes hydrauliques différents.
  5. Dispositif de forgeage selon la revendication 3 ou 4, caractérisé en ce que les vérins hydrauliques (14) présentent une enveloppe épaulée commune (20) avec un piston différentiel (21) qui est actionnable en fonction du mouvement de levage de l'actionneur de levage mécanique
  6. Dispositif de forgeage selon les revendications 2 et 5, caractérisé en ce que le piston différentiel (21) peut être pressé par la surface de contact (16) opposée au poinçon de forgeage (2) du coulisseau (6).
  7. Dispositif de forgeage selon une des revendications 1 à 6, caractérisé en ce que l'actionneur de levage mécanique peut être entraîné par un servomoteur électrique.
EP17208876.7A 2016-12-22 2017-12-20 Dispositif d'estampage Active EP3338909B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ATA51175/2016A AT519527B1 (de) 2016-12-22 2016-12-22 Schmiedevorrichtung

Publications (2)

Publication Number Publication Date
EP3338909A1 EP3338909A1 (fr) 2018-06-27
EP3338909B1 true EP3338909B1 (fr) 2022-06-15

Family

ID=60702347

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17208876.7A Active EP3338909B1 (fr) 2016-12-22 2017-12-20 Dispositif d'estampage

Country Status (2)

Country Link
EP (1) EP3338909B1 (fr)
AT (1) AT519527B1 (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3005404A (en) * 1959-09-01 1961-10-24 Tucker & Sons Hydraulic connecting unit for punch-press rams
US4148209A (en) * 1978-04-07 1979-04-10 Kawasaki Yukoh Kabushiki Kaisha Forging press
AT404440B (de) * 1996-09-17 1998-11-25 Gfm Holding Ag Verfahren zur hubfrequenzsteuerung einer schmiedemaschine und schmiedemaschine zum durchführen des verfahrens
AT407617B (de) * 1999-10-07 2001-05-25 Gfm Beteiligungs & Man Gmbh Schmiedemaschine

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Publication number Publication date
AT519527A1 (de) 2018-07-15
AT519527B1 (de) 2018-10-15
EP3338909A1 (fr) 2018-06-27

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