EP0967028A2 - Presse hydraulique - Google Patents

Presse hydraulique Download PDF

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Publication number
EP0967028A2
EP0967028A2 EP99890056A EP99890056A EP0967028A2 EP 0967028 A2 EP0967028 A2 EP 0967028A2 EP 99890056 A EP99890056 A EP 99890056A EP 99890056 A EP99890056 A EP 99890056A EP 0967028 A2 EP0967028 A2 EP 0967028A2
Authority
EP
European Patent Office
Prior art keywords
hydraulic
valve
press
piston
throttle
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
EP99890056A
Other languages
German (de)
English (en)
Other versions
EP0967028A3 (fr
EP0967028B1 (fr
Inventor
Martin Dipl.Ing. Rauwolf
Thomas Holderried
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.)
Hoerbiger Hydraulik GmbH
Original Assignee
Hoerbiger Hydraulik 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 Hoerbiger Hydraulik GmbH filed Critical Hoerbiger Hydraulik GmbH
Publication of EP0967028A2 publication Critical patent/EP0967028A2/fr
Publication of EP0967028A3 publication Critical patent/EP0967028A3/fr
Application granted granted Critical
Publication of EP0967028B1 publication Critical patent/EP0967028B1/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
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/02—Bending sheet metal along straight lines, e.g. to form simple curves on press brakes without making use of clamping means

Definitions

  • the invention relates to a hydraulic press, in particular a press brake, with at least one double-acting hydraulic working cylinder with different active areas on both sides of the piston, the side of the larger effective area via an additional suction line connected to the hydraulic tank and a suction valve in this suction line is switched on, which is closed during the working stroke and while the express strokes are open.
  • Pump delivery rate is used to act on the annulus side in today's constructions in this context on the opposite Piston side multiplied by the ratio of the effective areas Oil quantity from the piston-side cylinder space directly via an additional one Connection (suction line) pushed out into the hydraulic tank. With the express down movement in the pressing direction, however, a corresponding amount of oil from Tank to be returned to the piston-side cylinder space.
  • the object of the present invention is a hydraulic press improve the type mentioned so that the disadvantages mentioned known presses of this type can be avoided and in particular that simple and inexpensive way to increase the internal system rigidity and corresponding stability problems in the press retraction largely be eliminated.
  • This object is achieved according to the present invention in a press Type mentioned solved in that in addition in the suction line a switchable throttle is arranged, which during the extension of Hydraulic medium from the cylinder side with a larger effective area to the hydraulic tank is effective.
  • This simple throttling of the piston side Cylinder chamber in the rapid upward movement of the upper press beam to the tank Hydraulic medium causes an increase in system rigidity and Damping effect against speed peaks when accelerating the top beam.
  • This can eliminate the stability problems mentioned in the retreat and also the loop gain of the machine control in retreat be increased by orders of magnitude.
  • the result is a practically constant one Throttling effect on the amount of oil pushed out from the piston side Working area of the cylinder, effective over the entire retraction of the press is.
  • the switchable choke is also independent of or In addition to the suction valve, this in the open position can also be adjusted could be connected upstream, is a further embodiment of the invention preferred, according to which the suction valve itself in addition to open and Closed position still has at least one throttle position. So that can the for the reasons described above with regard to the suction from Tank during the rapid down movement as short or unrestricted connections between piston-side working space of the cylinder and tank without further or additional elements remain as short and unrestricted as possible - that anyway existing suction valve is simply designed so that there is even a throttle position, in which the flow in is weakened in the desired manner compared to the full cross section. If necessary, several throttle positions with different strengths can also be used be provided to different influences of the to allow flowing hydraulic medium.
  • the Suction valve a preferably hydraulically operated additional mechanical valve stop, which only partially opens with constant throttling effect on the hydraulic medium flowing through.
  • the throttle is adjustable, which is an easy and easy adaptation, for example to different presses or Operating conditions.
  • FIG. 1 shows a partial circuit diagram an inventive hydraulic press
  • FIG. 2 shows a Embodiment of a suction valve for use in an example 1 executed press.
  • the actual hydraulic press is essentially in Fig. 1 only a part of the slidable relative to the not shown cheek
  • Upper cheek 1 can be seen on which the piston rod 2 of a double-acting hydraulic working cylinder 3 attacks.
  • these two (or other working cylinders) mostly controlled by a synchronous control, but also, for example, for an intended inclination of the upper cheek 1 some can be operated separately.
  • the supply of the working rooms 4, 5 of the working cylinder as required 3 with hydraulic working medium is carried out by a control unit 6 from a line 7 from a motor-driven pump 8 with pressure medium is supplied.
  • the control unit 6 has a conventional design and arranged control elements, such as pressure limiters, pressure compensators, switching valves, Proportional directional valves, setbacks and dlg. on that as im Context with the present invention is not essential here either shown are further described.
  • lines 9 are provided, which also on known and not of further interest here to the corresponding Connections are sealed.
  • the suction valve 14 itself is so in the embodiment shown trained that it in addition to the open position shown and the symbolically visible closed position on the left another in the middle has indicated throttle position.
  • Connected lines 16 can be ensured that the piston side Working space 4 as desired in the normal working stroke compared to the Tank 13 is locked in the rapid-down movement (fast delivery)
  • Draw the required additional volume from the tank 13 practically unthrottled can and in the express-up movement (express withdrawal) while increasing the System rigidity only throttles the excess volume to the tank accordingly 13 can derive.
  • the suction valve 14 can be operated hydraulically provided additional mechanical valve stop 16, which is only a partial opening with constant throttling effect on the flow Hydraulic medium (corresponding to the middle position in Fig. 1) allowed.
  • suction valve 14 essentially consists of a valve sleeve according to FIG.
  • valve piston 18 axially movable therein, one with the Valve sleeve 17 connected in a sealed manner and part of the spring chamber 19th and a side control connection SA 1 middle section, one in the middle part screwed and sealed stop sleeve 20 and one in this axially movably guided stop piston 21 the arranged in the spring chamber 19 and the valve piston 18 in the illustrated Position biasing valve spring 22 including spring plate 23 and stop ring 24th as well as connection or closure parts that are of no further interest here the SA 1 and SA 2 control connections.
  • One the screwed in Stop sleeve 20 securing union nut is designated 25.
  • various sealing rings are not marked in the drawing, pressure tightness in view of the mostly relatively high press pressures ensure.
  • suction valve 14 The structure and mode of operation of the suction valve 14 will become the following essential press functions explained in more detail:
  • the connection SA 1 is relieved at the top dead center of the hydraulic press.
  • the pump pressure which is preferably applied continuously and unswitched at the control connection SA 2, corresponds to the circulating pressure of the three-way pressure compensator usually provided in the control unit 6 according to FIG. 1 or the basic pressure of the proportional pressure relief valve provided there.
  • the effective surface of the stop piston 21 is dimensioned such that the valve spring 22 moves the stop piston 21 against this minimum pressure over its entire stroke, so that the valve piston 18 of the suction valve 14 opens completely in the manner shown in FIG. 2 and only on the stop surface 26 in the fully open position is stopped.
  • the closing edge 27 on the valve piston 18 is lifted at a maximum from the associated seat surface 28 on the inside of the valve sleeve 17, with the result that hydraulic medium can flow back as freely as possible along the arrows 29 from the tank 13 to the piston-side working chamber 4.
  • Rapid-up movement Rapid withdrawal of the press:
  • the control connection SA 1 is relieved of pressure to the tank.
  • the effective surface of the stop piston 21 is designed so that when the upper cheek 1 is withdrawn, the pump pressure required for this is moved via SA 2 the stop piston 21 (and thus also the valve piston 18) against the valve spring 22 until it stops.
  • the valve stop 16 is thus formed here by the interaction of the annular surface 30 on the stop piston 21 with the annular surface 31 in the stop sleeve 20, the maximum stroke of the stop piston 21 designated 32 in the illustration according to FIG. 2 being of course smaller than the maximum stroke designated 33 of the valve piston 18, which is now not to be moved into the closed position but must still have an open gap to the seat surface 28 in the throttle position.
  • an additional throttle position having a suction valve 14 could do this also be designed, for example, as a simple 2/2-way valve and a downstream or upstream separate throttle element are provided, which can be switched into the suction line if necessary.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Presses (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Press Drives And Press Lines (AREA)
EP19990890056 1998-03-03 1999-02-17 Presse hydraulique Expired - Lifetime EP0967028B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT37198 1998-03-03
AT37198A AT408851B (de) 1998-03-03 1998-03-03 Hydraulische presse

Publications (3)

Publication Number Publication Date
EP0967028A2 true EP0967028A2 (fr) 1999-12-29
EP0967028A3 EP0967028A3 (fr) 2002-12-04
EP0967028B1 EP0967028B1 (fr) 2004-04-28

Family

ID=3488826

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19990890056 Expired - Lifetime EP0967028B1 (fr) 1998-03-03 1999-02-17 Presse hydraulique

Country Status (3)

Country Link
EP (1) EP0967028B1 (fr)
AT (1) AT408851B (fr)
DE (1) DE59909291D1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1270103A2 (fr) * 2001-06-27 2003-01-02 Hoerbiger Hydraulik GmbH Machine de travail hydraulique
DE10350483A1 (de) * 2003-10-29 2005-06-16 Müller Weingarten AG Vorrichtung zur Abscheidung von Öl in Hydrauliksystemen
EP2036711A1 (fr) 2007-09-12 2009-03-18 Trumpf Maschinen Austria GmbH & CO. KG. Dispositif d'entraînement pour une presse à plier

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019209440B3 (de) 2019-06-28 2020-07-30 HAWE Altenstadt Holding GmbH Hydromechanischer Linearwandler

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2542665A1 (de) * 1975-09-25 1977-05-05 Hartmann & Laemmle Kg Vorrichtung zur schlagfreien dekompression, insbesondere hydraulischer systeme
US4307654A (en) * 1978-08-29 1981-12-29 Inter-Hydraulik Ag Filling and exhaust valve for the control of the hydraulic flow on presses and shears
JPH06320219A (ja) * 1993-05-12 1994-11-22 Komatsu Ltd プレスブレーキの油圧制御回路

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4658625A (en) * 1984-03-30 1987-04-21 Amada Company, Limited Bending machine and a die changing system for such bending machine
JPH072088Y2 (ja) * 1988-11-15 1995-01-25 株式会社小松製作所 曲げ機械の工具位置制御装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2542665A1 (de) * 1975-09-25 1977-05-05 Hartmann & Laemmle Kg Vorrichtung zur schlagfreien dekompression, insbesondere hydraulischer systeme
US4307654A (en) * 1978-08-29 1981-12-29 Inter-Hydraulik Ag Filling and exhaust valve for the control of the hydraulic flow on presses and shears
JPH06320219A (ja) * 1993-05-12 1994-11-22 Komatsu Ltd プレスブレーキの油圧制御回路

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 1995, no. 02, 31. März 1995 (1995-03-31) -& JP 06 320219 A (KOMATSU LTD), 22. November 1994 (1994-11-22) *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1270103A2 (fr) * 2001-06-27 2003-01-02 Hoerbiger Hydraulik GmbH Machine de travail hydraulique
EP1270103A3 (fr) * 2001-06-27 2005-10-05 Hoerbiger Automatisierungstechnik Holding GmbH Machine de travail hydraulique
DE10350483A1 (de) * 2003-10-29 2005-06-16 Müller Weingarten AG Vorrichtung zur Abscheidung von Öl in Hydrauliksystemen
DE10350483B4 (de) * 2003-10-29 2005-09-22 Müller Weingarten AG Vorrichtung zur Abscheidung von Öl in Hydrauliksystemen
EP2036711A1 (fr) 2007-09-12 2009-03-18 Trumpf Maschinen Austria GmbH & CO. KG. Dispositif d'entraînement pour une presse à plier
WO2009033199A1 (fr) * 2007-09-12 2009-03-19 Trumpf Maschinen Austria Gmbh & Co. Kg. Dispositif d'entraînement pour presse à cintrer
US8342086B2 (en) 2007-09-12 2013-01-01 Trumpf Maschinen Austria Gmbh & Co. Kg. Drive device for a bending press
CN101835601B (zh) * 2007-09-12 2013-06-26 特鲁普机械奥地利有限公司及两合公司 用于弯曲压力机的驱动装置

Also Published As

Publication number Publication date
EP0967028A3 (fr) 2002-12-04
EP0967028B1 (fr) 2004-04-28
AT408851B (de) 2002-03-25
ATA37198A (de) 2001-08-15
DE59909291D1 (de) 2004-06-03

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