EP3338909A1 - Dispositif d'estampage - Google Patents

Dispositif d'estampage Download PDF

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Publication number
EP3338909A1
EP3338909A1 EP17208876.7A EP17208876A EP3338909A1 EP 3338909 A1 EP3338909 A1 EP 3338909A1 EP 17208876 A EP17208876 A EP 17208876A EP 3338909 A1 EP3338909 A1 EP 3338909A1
Authority
EP
European Patent Office
Prior art keywords
hydraulic
forging
mechanical lifting
lifting drive
piston
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
EP17208876.7A
Other languages
German (de)
English (en)
Other versions
EP3338909B1 (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
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 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 forged punch, with a mechanical lifting drive for the relative to the mechanical lifting drive slidably mounted forging punch and with a arranged between the forging punch and the mechanical lifting hydraulic pad, which is connected to a provided with a control valve hydraulic line.
  • the invention is therefore based on the object, a forging with supported by hydraulic cushion on mechanical lifting drives forging dies in such a way that can be influenced with a comparatively small design effort in many ways not only on the stroke position, but in particular on the stroke amplitude and the deformation rate.
  • the invention solves the stated object in that the hydraulic pad is connected via the hydraulic line to a pressure chamber at least one hydraulic cylinder whose piston is actuated in response to the lifting movement of the mechanical lifting drive.
  • the design effort is reduced to a hydraulic cylinder with a responsive to mechanical lifting actuator piston so that the hydraulic fluid is reciprocated only in response to the control of the control valve between the hydraulic cushion and the hydraulic cylinder, which is a superposition of the mechanical lifting drive brings a hydraulic drive with it, because of the forged and degradable between the forging punch and the mechanical lifting hydraulic pad is effective as a lift drive, with the help
  • the stroke amplitude and the deformation rate during the forging stroke can be influenced.
  • the receiving volume of the pressure chamber of the hydraulic cylinder is decisive for the adjustment of the hydraulic pad.
  • the mechanical lifting drive comprises an eccentric drive with a sliding block rotatably mounted on the eccentric, 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, hydraulic fluid is displaced by the eccentric drive from 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 corresponding to the amount of oil displaced from the hydraulic cushion enlarged piston adjustment.
  • the synchronization of the piston actuation of the hydraulic cylinder with the eccentric drive is therefore predetermined.
  • the respective possible adjustment variable of the hydraulic pad depends on the receiving volume of the pressure chamber of the hydraulic cylinder.
  • the hydraulic line of the hydraulic pad can be connected via a respective control valve with a plurality of actuatable in response to the lifting movement of the mechanical lifting actuator hydraulic cylinders.
  • the hydraulic cylinders can have a common, graduated housing with a stepped piston, which is acted upon in dependence on the lifting movement of the mechanical lifting drive. This means when using an eccentric drive as a mechanical lifting drive that the stepped piston is acted upon by the sliding block on its facing away from the forging die sliding surface.
  • the forging punch By adding and removing certain amounts of hydraulic fluid, the forging punch is displaced over the hydraulic cushion relative to the mechanical lifting drive, which creates the possibility of using the servo valves as control valves, the speed of the forging die during the working stroke compared to the speed profile given by the mechanical lifting drive and thus the deformation rate to change, however, which can bring considerable stress on the control valves.
  • the mechanical lifting drive can be driven by an electric servomotor, which allows independent of the control of the hydraulic pad change the speed profile over the stroke of the mechanical lifting drive.
  • the forging device after the Fig. 1 comprises a longitudinally guided in a housing 1 forging punch 2, which forms a purely schematically indicated receptacle 3 for a forging tool, and a mechanical lifting drive 4, which is designed as an eccentric drive with an eccentric 5 and a mounted on the eccentric sliding block 6.
  • the sliding block 6 does not act with its forging die 2 facing sliding surface 7 directly to the forging punch 2, but via a hydraulic pad 8, which is determined by the pressure chamber of a coaxial with the forging punch 2 in the housing 2 cylinder 9, in which the forging stamp. 2 engages with its end forming a piston 10.
  • the hydraulic pad 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 is supported on the facing away from the forging die 2 sliding surface 16 of the sliding block 6. So that a continuous contact of the piston 15 is ensured on the sliding block 6, the piston 15 is resiliently pressed against the sliding block 6.
  • the hydraulic cylinder 14 is connected via a switching valve 17 to a pressure accumulator 18, which causes an actuation of the piston 15 by a hydraulic spring.
  • the installation of the cylinder 9 is ensured for the hydraulic pad 8 on Gleitstein 6.
  • the forging stamp 2 is based on auxiliary piston 19, which are acted upon by a pressure accumulator with a hydraulic fluid, so that the forging punch 2 is held by means of a hydraulic spring with the interposition of the hydraulic pad 8 in contact with the sliding block 6.
  • the forging punch 2 is driven exclusively via the eccentric drive 4.
  • the height of the hydraulic pad 8 determines the stroke position of the forging die 2. Since a closed hydraulic control valve 12, a hydraulic fluid exchange between the hydraulic cushion 8 and the hydraulic cylinder 14 is suppressed, the application of the piston 15 via the pressure accumulator 18 is required to the system of the piston 15 at the To secure sliding surface 16 of the sliding block 6. For this purpose, the switching valve 17 is open.
  • control valve 12 is formed as a servo valve, then the hydraulic fluid flow between the hydraulic pad 8 and the hydraulic cylinder 14 can be controlled, which allows a change in the speed of the forging die 2 during the working stroke and thus an influence on the deformation rate.
  • influencing the stroke frequency is also possible, as is known per se. But it is not only a reduction of the stroke frequency, but with an adapted, mutual coordination of the volume of the hydraulic pad 8 and the hydraulic cylinder 14 and a corresponding control of the hydraulic pad 8 and the pressure accumulator 17 also a doubling of the stroke rate of the forging die 2 possible if over the Accumulator 17 sufficient hydraulic fluid is provided for an additional working stroke of the forging die 2 during the idle stroke of the mechanical lifting drive.
  • the embodiment of the Fig. 2 is different from the after Fig. 1 only in that the hydraulic cushion 8 with a plurality of hydraulic cylinders 14 cooperates, which are each connected via separately controllable control valves 12 to the hydraulic line 11 of the hydraulic pad 8.
  • the hydraulic cylinders 14 form according to the Fig. 2 a common, stepped housing 20 with a stepped piston 21, which forms with the individual hydraulic cylinders 14 cooperating piston sections.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
  • Presses And Accessory Devices Thereof (AREA)
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 true EP3338909A1 (fr) 2018-06-27
EP3338909B1 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)

Citations (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
EP1093871A2 (fr) * 1999-10-07 2001-04-25 GFM Beteiligungs- und Management GmbH & Co KG Machine à forger

Patent Citations (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
EP1093871A2 (fr) * 1999-10-07 2001-04-25 GFM Beteiligungs- und Management GmbH & Co KG Machine à forger

Also Published As

Publication number Publication date
AT519527B1 (de) 2018-10-15
AT519527A1 (de) 2018-07-15
EP3338909B1 (fr) 2022-06-15

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