EP0544137A2 - Table or ram assembly for a forming machine - Google Patents

Table or ram assembly for a forming machine Download PDF

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Publication number
EP0544137A2
EP0544137A2 EP92119098A EP92119098A EP0544137A2 EP 0544137 A2 EP0544137 A2 EP 0544137A2 EP 92119098 A EP92119098 A EP 92119098A EP 92119098 A EP92119098 A EP 92119098A EP 0544137 A2 EP0544137 A2 EP 0544137A2
Authority
EP
European Patent Office
Prior art keywords
longitudinal
sheets
ram assembly
transverse beams
short
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Withdrawn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
EP92119098A
Other languages
German (de)
French (fr)
Other versions
EP0544137A3 (en
Inventor
Wolfgang Hartung
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.)
Umformtechnik Erfurt GmbH
Original Assignee
Umformtechnik Erfurt 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 Umformtechnik Erfurt GmbH filed Critical Umformtechnik Erfurt GmbH
Publication of EP0544137A2 publication Critical patent/EP0544137A2/en
Publication of EP0544137A3 publication Critical patent/EP0544137A3/en
Withdrawn legal-status Critical Current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
    • B30B15/007—Means for maintaining the press table, the press platen or the press ram against tilting or deflection
    • 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
    • B21D5/0272—Deflection compensating means

Definitions

  • the invention relates to a table and / or ram assembly in a welded or cast construction of a forming machine.
  • the table and plunger assembly is made in welded construction or, more rarely, in cast construction.
  • the side members and, if necessary, the cross members are made of double T profiles or the box members are made of T profiles.
  • the suspension of the table crossbeams and rams has a particular influence in this context, since both serve as direct supports for the parts of the forming tool.
  • the problem of the invention consists in largely reducing the deflection of the conventional table and ram assemblies during the forming process and not increasing the mass or the height of the supports.
  • one or more sheets 1 made of high-strength, generally non-weldable steel are arranged parallel to the steel sheets of the longitudinal and cross members and are capable of absorbing a high load.
  • the outer sides of the sheets 1 are firmly connected to the press table.
  • the sheets 1 are each provided with an opening 2 in which two controllable hydraulic short-stroke cylinders 4 are arranged.
  • These short-stroke cylinders 4 are supported on the one hand against the high-strength sheets 1 and, on the other hand, against the steel sheets of the longitudinal and transverse beams, which are also provided with openings 3.
  • a measuring bridge 5 is arranged transversely over the longitudinal and transverse beams, the ends of which are mounted in the neutral zone of the press table with regard to the deflection.
  • a servo valve 6 and a monitoring valve 7 are arranged between the measuring bridge 5 and the belt of the longitudinal or cross members.
  • the servo valve 6 is operatively connected to the short-stroke cylinders 4 via a hydraulic system known per se.
  • the servo valve 6 will generally consist of a displacement sensor, a downstream transducer, a controller and the actual servo valve.
  • the servo valve 6 responds as a function of the suspension of the belt and thus of the sheet 1.
  • a pressure control valve is thereby acted upon, which regulates the pressure in the short-stroke cylinders 4. This causes the sheet 1 to be braced against the standing sheets of the longitudinal and cross members and the deflection of the press table is reduced, ie largely prevented.
  • a hydraulic accumulator is available as the energy source, which is able to provide the oil quantity required for pressure build-up in the short-stroke cylinders 4.
  • a reduction in pressure, as it must occur when the pressing force has subsided, is brought about by relieving the pressure in the short-stroke cylinders 4.
  • the pressure accumulator is constantly charged by a pump.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)

Abstract

The deflection of table and ram assemblies during the forming process seen in conventional table and ram assemblies is substantially reduced by the invention, without increasing the mass or the overall height of the supports. This problem is solved according to the invention by making it possible to generate a force in the direction opposite to the direction of deflection of the table and ram assembly during the forming process. To this end, one or more sheets 1 of high-strength steel are arranged parallel to the steel sheets of the longitudinal or transverse supports and can be braced by means of short-stroke cylinders 4 against the upright sheets of the longitudinal or transverse supports. <IMAGE>

Description

Die Erfindung betrifft eine Tisch- und/oder Stößelbaugruppe in Schweiß- oder Gußkonstruktion einer Umformmaschine.The invention relates to a table and / or ram assembly in a welded or cast construction of a forming machine.

In allgemein bekannter Weise wird die Tisch- und Stößelbaugruppe in Schweißkonstruktion oder seltener in Gußkonstruktion ausgeführt. Dabei bestehen die Längsträger und soweit erforderlich auch die Querträger aus Doppel-T-Profilen oder die Kastenträger aus T-Profilen. Die Erhöhung der Qualitätsanforderungen an die Erzeugnisse der Umformtechnik, speziell die Steigerung der Maßhaltigkeit umgeformter Blechteile, fordert u. a. Produktionseinrichtungen höherer Steifigkeit. Besonderen Einfluß in diesem Rahmen hat die Federung der Tischtraversen und Stößel, da beide als unmittelbare Träger der Teile des Umformwerkzeuges dienen.In a generally known manner, the table and plunger assembly is made in welded construction or, more rarely, in cast construction. The side members and, if necessary, the cross members are made of double T profiles or the box members are made of T profiles. The increase in quality requirements for the products of metal forming technology, especially the increase in dimensional accuracy of formed sheet metal parts, demands u. a. Production facilities with higher rigidity. The suspension of the table crossbeams and rams has a particular influence in this context, since both serve as direct supports for the parts of the forming tool.

Um diesen Anforderungen an die Festigkeit der Tisch- und Stößelbaugruppe gerecht zu werden, besteht bisher nur die Möglichkeit, die Querschnitte der Träger masseaufwendig zu verstärken bzw. soweit im Gesamtkonzept der Maschine möglich, die Bauhöhen der Träger zu vergrößern.In order to meet these requirements for the strength of the table and ram assembly, there has so far only been the option of strengthening the cross-sections of the beams in a mass-intensive manner or, as far as possible in the overall concept of the machine, of increasing the overall heights of the beams.

Das Problem der Erfindung besteht nun darin, bei den herkömmlichen Tisch- und Stößelbaugruppen deren Durchbiegung während des Umformprozesses weitgehend zu reduzieren und dabei den Masseeinsatz bzw. die Bauhöhe der Träger nicht zu erhöhen.The problem of the invention consists in largely reducing the deflection of the conventional table and ram assemblies during the forming process and not increasing the mass or the height of the supports.

Erfindungsgemäß wird das Problem durch die in den kennzeichnenden Teilen der Patentansprüche beschriebenen Merkmale gelöst.According to the invention the problem is solved by the features described in the characterizing parts of the claims.

Die Erfindung wird nachfolgend an einem Ausführungsbeispiel näher erläutert. Die zugehörigen Zeichnungen zeigen:

Fig. 1:
Prinzipdarstellung eines Pressentisches
Fig. 2:
Seitenansicht nach Fig. 1 im Schnitt
Im Ausführungsbeispiel wird nur die Anwendung der Lösung im Pressentisch beschrieben, da die Lösung für den Stößel in einfacher Analogie übertragbar ist.The invention is explained in more detail using an exemplary embodiment. The associated drawings show:
Fig. 1:
Principle representation of a press table
Fig. 2:
1 in section
In the exemplary embodiment, only the use of the solution in the press table is described, since the solution for the ram can be transferred in a simple analogy.

Bei dem bekannten Pressentischaufbau in Schweiß- und Gußkonstruktion werden parallel zu den Stahlblechen der Längs- und Querträger eine oder mehrere Bleche 1 aus hochfesten, in der Regel nicht schweißbaren Stahl angeordnet, die in der Lage sind, eine hohe Belastung aufzunehmen. Die äußeren Seiten der Bleche 1 sind fest mit dem Pressentisch verbunden. In ihrem mittleren Bereich sind die Bleche 1 jeweils mit einer Öffnung 2 versehen, in der zwei steuerbare hydraulische Kurzhubzylinder 4 angeordnet sind. Diese Kurzhubzylinder 4 stützen sich einerseits gegen die hochfesten Bleche 1 und andererseits gegen die ebenfalls mit Öffnungen 3 versehenen Stahlbleche der Längs- und Querträger ab. Weiterhin ist quer über die Längs- und Querträger eine Meßbrücke 5 angeordnet, die mit ihren Enden in der neutralen Zone des Pressentisches hinsichtlich der Durchbiegung gelagert ist. Zwischen der Meßbrücke 5 und dem Gurt der Längs- oder Querträger sind ein Servoventil 6 und ein Überwachungsventil 7 angeordnet. Das Servoventil 6 steht über ein an sich bekanntes Hydrauliksystem mit den Kurzhubzylindern 4 in Wirkverbindung. Das Servoventil 6 wird in der Regel aus einem wegaufnehmenden Sensor, einem nachgeschalteten Meßwertumformer, einem Regler und dem eigentlichen Servoventil bestehen.In the known press table structure in welded and cast construction, one or more sheets 1 made of high-strength, generally non-weldable steel are arranged parallel to the steel sheets of the longitudinal and cross members and are capable of absorbing a high load. The outer sides of the sheets 1 are firmly connected to the press table. In their central area, the sheets 1 are each provided with an opening 2 in which two controllable hydraulic short-stroke cylinders 4 are arranged. These short-stroke cylinders 4 are supported on the one hand against the high-strength sheets 1 and, on the other hand, against the steel sheets of the longitudinal and transverse beams, which are also provided with openings 3. Furthermore, a measuring bridge 5 is arranged transversely over the longitudinal and transverse beams, the ends of which are mounted in the neutral zone of the press table with regard to the deflection. A servo valve 6 and a monitoring valve 7 are arranged between the measuring bridge 5 and the belt of the longitudinal or cross members. The servo valve 6 is operatively connected to the short-stroke cylinders 4 via a hydraulic system known per se. The servo valve 6 will generally consist of a displacement sensor, a downstream transducer, a controller and the actual servo valve.

Während des Umformprozesses spricht in Abhängigkeit von der Federung des Gurtes und damit des Bleches 1 das Servoventil 6 an. Dadurch wird ein Druckregelventil beaufschlagt, das den Druck in den Kurzhubzylindern 4 regelt. Damit erfolgt ein Verspannen des Bleches 1 gegen die Stehbleche der Längs- und Querträger und die Durchbiegung des Pressentisches wird reduziert, d.h. weitgehend verhindert.During the forming process, the servo valve 6 responds as a function of the suspension of the belt and thus of the sheet 1. A pressure control valve is thereby acted upon, which regulates the pressure in the short-stroke cylinders 4. This causes the sheet 1 to be braced against the standing sheets of the longitudinal and cross members and the deflection of the press table is reduced, ie largely prevented.

Als Energiequelle steht jeweils ein hydraulischer Speicher zur Verfügung, der in der Lage ist, die erforderliche Ölmenge zum Druckaufbau in den Kurzhubzylindern 4 bereitzustellen. Ein Druckabbau, wie er mit dem Abklingen der Preßkraft eintreten muß, wird durch Ablassen des Druckes in den Kurzhubzylindern 4 bewirkt. Der Druckspeicher wird durch eine Pumpe ständig aufgeladen.A hydraulic accumulator is available as the energy source, which is able to provide the oil quantity required for pressure build-up in the short-stroke cylinders 4. A reduction in pressure, as it must occur when the pressing force has subsided, is brought about by relieving the pressure in the short-stroke cylinders 4. The pressure accumulator is constantly charged by a pump.

Zur Sicherheit gegen ein Verzögern oder Versagen der Entlastung der Kurzhubzylinder 4 oder ein Überbiegen der Bleche 1 dient das wegabhängig betätigbare Überwachungsventil 7, das als Auslaßventil ausgebildet ist.The safety-dependent actuating monitoring valve 7, which is designed as an outlet valve, serves as a security against delaying or failure of the relief of the short-stroke cylinders 4 or over-bending of the sheets 1.

Claims (3)

Tisch- und/oder Stößelbaugruppe einer Umformmaschine, die überwiegend aus Längs- und Querträgern besteht und in Schweiß- oder Gußkonstruktion ausgeführt ist,
dadurch gekennzeichnet,
daß entgegen der Richtung der Durchbiegung der Tisch- und/oder Stößelbaugruppe während des Umformprozesses eine Kraft erzeugbar ist.Table and / or ram assembly of a metal forming machine, which mainly consists of longitudinal and cross members and is designed in a welded or cast construction,
characterized,
that a force can be generated against the direction of the deflection of the table and / or ram assembly during the forming process. Tisch- und/oder Stößelbaugruppe nach Anspruch 1,
dadurch gekennzeichnet,
daß parallel zu den Stahlblechen der Längs- oder Querträger ein oder mehrere Bleche (1) aus hochfesten Stahl angeordnet und mit denselben fest verbunden sind, die Bleche (1) im mittleren Bereich ihrer Fläche mit je einer Öffnung (2) versehen sind, in der ein oder mehrere steuerbare hydraulische Kurzhubzylinder (4) angeordnet sind, die sich einerseits gegen die hochfesten Bleche (1) und andererseits gegen die ebenfalls mit Öffnungen (3) versehenen Stehbleche der Längs- und Querträger abgestützen und
zwischen einer quer über die Längs- oder Querträger verlaufenden und an den Enden abgestützten Meßbrücke (5) und dem Gurt der Längs- oder Querträger ein Überwachungsventil (7) und ein Servoventil (6) angeordnet sind, wobei das Servoventil (6) über ein Hydrauliksystem mit den Kurzhubzylindern (4) in Wirkverbindung steht.Table and / or ram assembly according to claim 1,
characterized,
that one or more sheets (1) made of high-strength steel are arranged parallel to the steel sheets of the longitudinal or transverse beams and firmly connected to them, the sheets (1) are each provided with an opening (2) in the central area of their surface in which one or more controllable hydraulic short-stroke cylinders (4) are arranged, which are supported on the one hand against the high-strength plates (1) and on the other hand against the standing plates of the longitudinal and cross members, which are also provided with openings (3) and
A monitoring valve (7) and a servo valve (6) are arranged between a measuring bridge (5) running across the longitudinal or transverse beams and supported at the ends and the belt of the longitudinal or transverse beams, the servo valve (6) being controlled by a hydraulic system is in operative connection with the short-stroke cylinders (4). Tisch- und/oder Stößelbaugruppe nach Anspruch 1 und 2
gekennzeichnet dadurch,
daß die Verbindung zwischen den hochfesten Blechen (1) und den Längs- bzw. Querträgern im Bereich der neutralen Faser der Biegeträger erfolgt.Table and / or ram assembly according to claim 1 and 2
characterized by
that the connection between the high-strength sheets (1) and the longitudinal or transverse beams takes place in the area of the neutral fiber of the bending beams.
EP19920119098 1991-11-25 1992-11-07 Table or ram assembly for a forming machine Withdrawn EP0544137A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4138607 1991-11-25
DE19914138607 DE4138607A1 (en) 1991-11-25 1991-11-25 TABLE AND / OR PILOT ASSEMBLY OF A FORMING MACHINE

Publications (2)

Publication Number Publication Date
EP0544137A2 true EP0544137A2 (en) 1993-06-02
EP0544137A3 EP0544137A3 (en) 1993-06-30

Family

ID=6445465

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19920119098 Withdrawn EP0544137A3 (en) 1991-11-25 1992-11-07 Table or ram assembly for a forming machine

Country Status (2)

Country Link
EP (1) EP0544137A3 (en)
DE (1) DE4138607A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007012860A1 (en) * 2007-03-17 2008-09-18 Schuler Pressen Gmbh & Co. Kg Press with variable stiffness
DE102016115446A1 (en) 2016-08-19 2018-02-22 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Cambering device for a forming machine, forming machine with crowning device, tool with crowning device and crowning method

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10148954B4 (en) * 2001-10-04 2013-06-13 Siempelkamp Maschinen- Und Anlagenbau Gmbh & Co. Kg Device for compensation of deformations on clamping surfaces of machines

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1200920A (en) * 1958-07-01 1959-12-24 Device for the compensation and control of deformations undergone by the active parts of presses or similar machines
DE1527979A1 (en) * 1966-07-14 1971-11-04 Karl Guerr Press brake
DE1703297A1 (en) * 1968-04-29 1972-02-17 Freudenberg Carl Fa Hot plate press with self-compensating cylinder piston arrangements
FR1604992A (en) * 1968-12-30 1972-06-26
DE2245839A1 (en) * 1972-05-25 1973-12-06 Edouard Paskowsky S A Folding press - with an hydraulic jack for compensation against bending action on the workpiece
WO1982002360A1 (en) * 1981-01-13 1982-07-22 Huber Arthur Hydraulic press comprising a fixed apron and a moving apron
EP0125974A1 (en) * 1983-05-05 1984-11-21 Metalurgica Burcena, Sa- Mebusa Forming press, particularly a folding press

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1200920A (en) * 1958-07-01 1959-12-24 Device for the compensation and control of deformations undergone by the active parts of presses or similar machines
DE1527979A1 (en) * 1966-07-14 1971-11-04 Karl Guerr Press brake
DE1703297A1 (en) * 1968-04-29 1972-02-17 Freudenberg Carl Fa Hot plate press with self-compensating cylinder piston arrangements
FR1604992A (en) * 1968-12-30 1972-06-26
DE2245839A1 (en) * 1972-05-25 1973-12-06 Edouard Paskowsky S A Folding press - with an hydraulic jack for compensation against bending action on the workpiece
WO1982002360A1 (en) * 1981-01-13 1982-07-22 Huber Arthur Hydraulic press comprising a fixed apron and a moving apron
EP0125974A1 (en) * 1983-05-05 1984-11-21 Metalurgica Burcena, Sa- Mebusa Forming press, particularly a folding press

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007012860A1 (en) * 2007-03-17 2008-09-18 Schuler Pressen Gmbh & Co. Kg Press with variable stiffness
DE102007012860B4 (en) * 2007-03-17 2010-08-26 Schuler Pressen Gmbh & Co. Kg Tool for a variable stiffness press
US8925365B2 (en) 2007-03-17 2015-01-06 Schuler Pressen Gmbh & Co. Kg Press with variable rigidity
DE102016115446A1 (en) 2016-08-19 2018-02-22 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Cambering device for a forming machine, forming machine with crowning device, tool with crowning device and crowning method

Also Published As

Publication number Publication date
EP0544137A3 (en) 1993-06-30
DE4138607A1 (en) 1993-05-27

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