EP2813357A1 - Déclencheur de surcharge dans une servopresse - Google Patents

Déclencheur de surcharge dans une servopresse Download PDF

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Publication number
EP2813357A1
EP2813357A1 EP14171544.1A EP14171544A EP2813357A1 EP 2813357 A1 EP2813357 A1 EP 2813357A1 EP 14171544 A EP14171544 A EP 14171544A EP 2813357 A1 EP2813357 A1 EP 2813357A1
Authority
EP
European Patent Office
Prior art keywords
dead center
pressure
pressing force
press
bottom dead
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.)
Withdrawn
Application number
EP14171544.1A
Other languages
German (de)
English (en)
Inventor
Berthold Daub
Henning Fries
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.)
Grabener Pressensysteme & Co KG GmbH
Original Assignee
Grabener Pressensysteme & Co KG 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 Grabener Pressensysteme & Co KG GmbH filed Critical Grabener Pressensysteme & Co KG GmbH
Publication of EP2813357A1 publication Critical patent/EP2813357A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/28—Arrangements for preventing distortion of, or damage to, presses or parts thereof
    • B30B15/281—Arrangements for preventing distortion of, or damage to, presses or parts thereof overload limiting devices
    • B30B15/284—Arrangements for preventing distortion of, or damage to, presses or parts thereof overload limiting devices releasing fluid from a fluid chamber subjected to overload 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
    • B30B1/265—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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/14—Control arrangements for mechanically-driven presses

Definitions

  • the invention relates to a mechanical press for molding processes of molded parts with a top and a bottom tool, which form a mold for the molding between them, and a hydraulically assisted drive for the upper tool and / or the lower tool and for movement between a top dead center and a bottom dead center and a method for molding of moldings in such a mechanical press.
  • Mechanical presses usually equipped as a servo eccentric with an electric drive or toggle presses with hydraulically assisted power transmission for at least one of the tools, are designed for various molding processes, such as embossing metallic bodies, mold hardening or even the production of composite and hybrid materials.
  • molding processes such as embossing metallic bodies, mold hardening or even the production of composite and hybrid materials.
  • the development of new lightweight technologies has progressed in recent years.
  • many different combinations of molding processes are used.
  • the resulting material properties Depending on the joining method used, one usually distinguishes mechanical, thermal and hybrid bonding techniques.
  • Mechanical presses generate the forming forces required for the molding process with appropriate design of frame and drive, wherein the pressing force on the upper and / or lower tool is performed periodically depending on the rotational speed of the flywheel used in the press.
  • the stroke adjustment takes place by means of a rotatable eccentric bushing between the eccentric pin and the connecting rod, and additionally by a plunger adjustment of the bottom dead center.
  • Mechanical presses of the type in question used for example in stamping machines, reach a maximum stroke rate of about 1500 strokes per minute.
  • Mechanical presses for example designed as eccentric and toggle presses, are usually designed as servo presses in which the drive of the tool (s) is electrically assisted.
  • the pressing force is applied by means of a hydraulic system.
  • the principle of operation of such mechanical presses usually provides a continuous forming process without interruption at bottom dead center, in which the forming tools are closed and the nominal pressing force is applied. At least, however, such mechanical presses only have an extremely short residence time in the area of bottom dead center.
  • Hydraulic overload devices on presses are already known from the prior art for this purpose, by means of which it is possible to abruptly reduce the pressure in the hydraulic cylinder (s). Such a hydraulic overload protection is usually provided for the bottom dead center mechanical servo presses. Hydraulic overload devices are for example in the DE 10015785 A1 , of the DE 3810490 C2 , of the DE 4436742 A1 , of the DE 19643104 A1 , of the EP 0114170 B1 , of the DE 4036470 A1 , of the GB 2235404 A or the DE 19805519 C1 disclosed.
  • a disadvantage of such hydraulic overload protection devices is that, according to their purpose, they abruptly reduce the pressure in the hydraulic cylinder, whereby it is not possible to keep molded parts under defined press force ratios over a defined period of time within the mold and if necessary to cure, shape and / or cool under precisely defined conditions.
  • an overload protection for lowering the hydraulic pressure for applying a pressing force to the upper tool and / or the lower tool at least at the bottom dead center, but preferably at the bottom dead center is provided on the device side.
  • This overload protection is in operative connection with at least one release device for targeted and preferably continuous lowering of the hydraulic pressure over a predetermined time and below a predetermined threshold.
  • the release device is designed and operable such that the structure of the hydraulic pressure for applying the pressing force from the threshold value to the nominal force in the passage of the press from bottom dead center to top dead center can be effected.
  • the object of the invention to ensure a targeted release of the press by reducing the pressing force at least at the bottom dead center by means of the hydraulic overload protection solved by simple means.
  • the production of composite and hybrid materials in which a persistence of the press at bottom dead center over a predetermined time and possibly also applying a predetermined pressing force is required can with the invention using a mechanical press of the type in question be realized.
  • the drive for the upper tool and / or the lower tool comprises at least one eccentric and / or a toggle lever.
  • the desired nominal pressing force is applied specifically to the molded part with particularly simple and controllable means, it being particularly preferred if the force distribution on the lower and / or upper tool is applied symmetrically or asymmetrically as required by a toggle lever arrangement or the use of several eccentrics becomes.
  • the predetermined threshold under which the hydraulic pressure is lowered over a predetermined time, adjusted so that no more than 10% of the nominal pressing force can be achieved, preferably the nominal pressing force at bottom dead center and after completion of the lowering process at least almost zero is.
  • the predetermined time over which the hydraulic pressure is lowered by means of the overload safety device and the release device is at least one second, preferably at least three seconds. hereby the desired slow and controlled lowering of the hydraulic pressure is achieved particularly advantageous.
  • the release device is operable so that the structure of the hydraulic pressure for applying the pressing force from the threshold value to the nominal pressing force in the passage of the press from bottom dead center to top dead center is effected.
  • a mechanical press which provides the nominal pressure force at least from reaching the top dead center again without delay, whereas the process of the press from bottom dead center to top dead center, in which the provision of the nominal pressing force is not mandatory, the structure of the nominal press force of the threshold, preferably close to zero. It is thus obtained a mechanical press, in which the cycle times or the stroke speed can be optimally adjusted.
  • the invention is operable by a method comprising the steps of separating upper and lower tool at top dead center of the press, the introduction of the molding or its starting materials in at least a part of the mold, the driving of the press to its bottom dead center, the residence of the press at bottom dead center for a predetermined time, the targeted reduction of the pressing force by lowering the hydraulic pressure and the driving of the press to its top dead center, in which case the biasing pressure is specifically increased.
  • the nominal pressing force is applied to the molding at least over a predetermined period of time and then selectively the hydraulic pressure for applying the pressing force is reduced.
  • the targeted reduction of the pressing force at the bottom dead center takes place only after a predefined time interval of preferably more than two seconds, in particular more than three seconds. This ensures that under defined conditions with respect to the applied pressing forces and the time that the defined pressing forces act on the molding, there is sufficient time for cooling and / or curing and / or connection of the materials or moldings to be molded.
  • the targeted and preferably continuous lowering of the hydraulic pressure takes place along a pressure curve, which is monotonically decreasing in the region of the lowering, preferably in a strictly monotonically decreasing manner.
  • the targeted controlled lowering of the hydraulic pressure, of which the pressing force is directly dependent achieved with particularly simple and easy to control means.
  • the lowering of the hydraulic pressure is thus carried out over the entire process to below the predefined threshold under defined conditions and in particular while ensuring the predetermined minimum times both for maintaining the nominal pressing force or another predetermined pressing force, over a predetermined period, as well as for Lowering to below the threshold.
  • An advantageous arrangement of the pressure storage unit 9 would be as close as possible to the pressure pad 7.1, 7.2, in order to minimize the negative influence of long connecting lines and to reduce the pressure build-up time of the biasing pressure Pv. This leads to an increase in the cycle time of the press and has a positive effect on the availability.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Presses (AREA)
EP14171544.1A 2013-06-10 2014-06-06 Déclencheur de surcharge dans une servopresse Withdrawn EP2813357A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102013210807.9A DE102013210807A1 (de) 2013-06-10 2013-06-10 Überlast-Löseeinrichtung in einer Servopresse

Publications (1)

Publication Number Publication Date
EP2813357A1 true EP2813357A1 (fr) 2014-12-17

Family

ID=50927960

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14171544.1A Withdrawn EP2813357A1 (fr) 2013-06-10 2014-06-06 Déclencheur de surcharge dans une servopresse

Country Status (2)

Country Link
EP (1) EP2813357A1 (fr)
DE (1) DE102013210807A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106739094A (zh) * 2017-01-10 2017-05-31 南安市智德机械设备有限公司 一种用于机械领域的加工用废料压块设备
DE102016106286A1 (de) * 2016-04-06 2017-10-12 Schuler Pressen Gmbh Verfahren und Vorrichtung zur Steuerung und Regelung der Stößelbewegung und der Stößelkräfte an Mehrpunkt-Servo-Hybrid-Pressen

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6024500U (ja) * 1983-07-28 1985-02-19 トヨタ自動車株式会社 プレス荷重制御装置
EP0114170B1 (fr) 1983-01-22 1986-11-12 L. SCHULER GmbH Protecteur de surcharge pour presses
GB2235404A (en) 1989-05-09 1991-03-06 Aida Eng Ltd Overload protector for press machine
JPH03238200A (ja) * 1990-02-16 1991-10-23 Ishikawajima Harima Heavy Ind Co Ltd 加圧速度可変プレス
DE4036470A1 (de) 1990-11-15 1992-05-21 Mueller Weingarten Maschf Ueberlastsicherung fuer eine mechanisch angetriebene presse
DE4118569A1 (de) * 1991-06-06 1992-12-10 Univ Dresden Tech Hydraulischer druckpunkt
DE3810490C2 (fr) 1988-03-28 1993-05-13 L. Schuler Gmbh, 7320 Goeppingen, De
DE4436742A1 (de) 1993-10-18 1995-05-04 Zdas A S Zd Ar Nad Sazavou Hydraulische Überlastsicherung
DE19643104A1 (de) 1996-10-21 1998-04-23 Ulrich Keller Ventileinrichtung, insbesondere für hydraulische Überlasteinrichtungen an Pressen zur vorausschauenden Betätigung des Überlastventils
DE19805519C1 (de) 1998-02-11 1999-07-29 Fraunhofer Ges Forschung Überlastsicherung für mechanische Pressen
DE10015785A1 (de) 2000-03-30 2001-10-04 Ulrich Keller Einfache, sichere und schnelle Ventileinrichtung insbesondere für hydraulische Überlasteinrichtungen an Pressen
DE202012102297U1 (de) * 2012-06-21 2012-09-20 Schuler Pressen Gmbh Hydraulischer Druckpunkt
DE102011016669A1 (de) * 2011-04-12 2012-10-18 Schuler Pressen Gmbh Verfahren zum Betreiben einer Presse mit Unterantrieb und danach betriebene Presse

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202007007144U1 (de) * 2007-05-18 2007-09-13 Raster Technology Gmbh Exzenterpresse
DE102009043729A1 (de) * 2009-10-01 2011-04-21 Haco N.V. Verfahren zum Bewegen einer Bearbeitungseinheit einer Maschine
JP5528984B2 (ja) * 2010-10-19 2014-06-25 アイダエンジニアリング株式会社 機械プレスのプレス荷重制御装置

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0114170B1 (fr) 1983-01-22 1986-11-12 L. SCHULER GmbH Protecteur de surcharge pour presses
JPS6024500U (ja) * 1983-07-28 1985-02-19 トヨタ自動車株式会社 プレス荷重制御装置
DE3810490C2 (fr) 1988-03-28 1993-05-13 L. Schuler Gmbh, 7320 Goeppingen, De
GB2235404A (en) 1989-05-09 1991-03-06 Aida Eng Ltd Overload protector for press machine
JPH03238200A (ja) * 1990-02-16 1991-10-23 Ishikawajima Harima Heavy Ind Co Ltd 加圧速度可変プレス
DE4036470A1 (de) 1990-11-15 1992-05-21 Mueller Weingarten Maschf Ueberlastsicherung fuer eine mechanisch angetriebene presse
DE4118569A1 (de) * 1991-06-06 1992-12-10 Univ Dresden Tech Hydraulischer druckpunkt
DE4436742A1 (de) 1993-10-18 1995-05-04 Zdas A S Zd Ar Nad Sazavou Hydraulische Überlastsicherung
DE19643104A1 (de) 1996-10-21 1998-04-23 Ulrich Keller Ventileinrichtung, insbesondere für hydraulische Überlasteinrichtungen an Pressen zur vorausschauenden Betätigung des Überlastventils
DE19805519C1 (de) 1998-02-11 1999-07-29 Fraunhofer Ges Forschung Überlastsicherung für mechanische Pressen
DE10015785A1 (de) 2000-03-30 2001-10-04 Ulrich Keller Einfache, sichere und schnelle Ventileinrichtung insbesondere für hydraulische Überlasteinrichtungen an Pressen
DE102011016669A1 (de) * 2011-04-12 2012-10-18 Schuler Pressen Gmbh Verfahren zum Betreiben einer Presse mit Unterantrieb und danach betriebene Presse
DE202012102297U1 (de) * 2012-06-21 2012-09-20 Schuler Pressen Gmbh Hydraulischer Druckpunkt

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016106286A1 (de) * 2016-04-06 2017-10-12 Schuler Pressen Gmbh Verfahren und Vorrichtung zur Steuerung und Regelung der Stößelbewegung und der Stößelkräfte an Mehrpunkt-Servo-Hybrid-Pressen
JP2019513559A (ja) * 2016-04-06 2019-05-30 シューラー プレッセン ゲーエムベーハーＳｃｈｕｌｅｒ Ｐｒｅｓｓｅｎ ＧｍｂＨ マルチポイントサーボハイブリッドプレス機でのラム運動およびラム力を閉ループ制御する方法および装置
US10870251B2 (en) 2016-04-06 2020-12-22 Schuler Pressen Gmbh Method and device for closed-loop control of ram movement and ram forces in multi-point servo hybrid presses
DE102016106286B4 (de) 2016-04-06 2023-03-02 Schuler Pressen Gmbh Verfahren und Vorrichtung zur Steuerung und Regelung der Stößelbewegung und der Stößelkräfte an Mehrpunkt-Servo-Hybrid-Pressen
CN106739094A (zh) * 2017-01-10 2017-05-31 南安市智德机械设备有限公司 一种用于机械领域的加工用废料压块设备

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