EP0623065B1 - Profiled clamping jaw and process for clamping workpieces - Google Patents

Profiled clamping jaw and process for clamping workpieces Download PDF

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Publication number
EP0623065B1
EP0623065B1 EP92923770A EP92923770A EP0623065B1 EP 0623065 B1 EP0623065 B1 EP 0623065B1 EP 92923770 A EP92923770 A EP 92923770A EP 92923770 A EP92923770 A EP 92923770A EP 0623065 B1 EP0623065 B1 EP 0623065B1
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EP
European Patent Office
Prior art keywords
clamping
clamping jaw
base body
profiled
jaw according
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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.)
Expired - Lifetime
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EP92923770A
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German (de)
French (fr)
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EP0623065A1 (en
Inventor
Hermann Püttmer
Peter Abraham
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Goetze GmbH
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GOETZ METALL ANLAGEN
Goetze GmbH
Gotz GmbH
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B1/00—Vices
    • B25B1/24—Details, e.g. jaws of special shape, slideways
    • B25B1/2405—Construction of the jaws
    • B25B1/241—Construction of the jaws characterised by surface features or material
    • B25B1/2415—Construction of the jaws characterised by surface features or material being composed of a plurality of parts adapting to the shape of the workpiece
    • B25B1/2421—Construction of the jaws characterised by surface features or material being composed of a plurality of parts adapting to the shape of the workpiece the parts having a linear movement

Definitions

  • the invention relates to a mold jaw for clamping workpieces of the type specified in the preamble of claim 1.
  • Clamping jaws are components of clamping devices, such as those required in vices, machine tools or machining centers for holding workpieces.
  • mold clamping jaws For clamping profile bars, in particular for window, door or facade construction, mold clamping jaws have so far been used, the surface contour of which is adapted to the contour of the workpiece to be clamped.
  • a special mold clamping jaw is produced, which must be exchanged in the relevant clamping device if the workpiece to be machined is changed. Because of the long changeover times, the known mold clamping jaws can therefore only be used economically in series production with medium and large batch sizes of at least 200 pieces, but not in single or small series production. This applies in particular to use with large row drilling and milling machines, in which a large number of clamping devices with form clamping jaws are used.
  • mold clamping jaws are known (US Pat. No. 3,211,445) which have a base body and have a clamping surface which is arranged on the base body and can be deformed by moving the base body against a workpiece until a clamping position is reached and can thereby be automatically adapted to the contour of the workpiece surface.
  • the clamping surface is composed of a multiplicity of pressure pieces which can be displaced independently of one another relative to the base body and can be locked thereon in the clamping position.
  • Each pressure piece is guided with a tension plunger in a thrust guide of the base body, the tension plungers each carrying a plunger piston engaging in a plunger cylinder of the base body and the plunger cylinders being acted upon with hydraulic fluid in the tensioning direction via a common hydraulic distributor.
  • the tension plungers each carrying a plunger piston engaging in a plunger cylinder of the base body and the plunger cylinders being acted upon with hydraulic fluid in the tensioning direction via a common hydraulic distributor.
  • the object of the invention is to improve the mold jaws of the type specified at the outset in such a way that adaptation to different workpiece contours is possible in a simple manner.
  • the solution according to the invention is based on the idea that a shut-off valve is arranged between the individual tappet cylinders and the hydraulic distributor and that the shut-off valves are acted on with the same pressure from a common hydraulic distributor.
  • the invention proposes that the shut-off valves each carry a control piston which can be acted upon on both sides with hydraulic fluid and which is arranged in a control cylinder, and that the control pistons can be acted upon with hydraulic fluid at their opposite piston surfaces via two separate hydraulic distributors.
  • the plunger pistons can operate at atmospheric pressure on their piston surface opposite the hydraulic distributor from the ambient air.
  • the one, preferably shut-off valve-side piston surface of the control pistons and the tappet pistons are expediently acted upon by hydraulic fluid from the same hydraulic distributor.
  • the mutually associated tappet cylinders and the control cylinders are aligned coaxially with one another, so that the shut-off valves are actuated axially to the tappet cylinders via their control pistons.
  • the hydraulic cylinders are arranged in a common cylinder block, while the shut-off valves are arranged in a common valve plate connected to the cylinder block, preferably screwed to it.
  • the control cylinders can in turn be arranged in a common cylinder plate connected to the valve plate, preferably screwed, on the side opposite the valve plate closed by a base plate. In this way it is possible with simple structural means to design the hydraulic distributor through a free space arranged between the valve plate and the cylinder plate, while a second hydraulic distributor communicating with the control cylinder can additionally be arranged as a free space between the valve plate and the base plate.
  • a cover plate which closes the cylinder block and forms the thrust guide, can be provided for the passage of the tensioning plunger, wherein a free space, which is connected to the plunger cylinders and preferably communicates with the atmosphere, can be left out between the cover plate and the cylinder block.
  • the mold clamping jaws according to the invention are used with particular advantage in clamping devices which have a block slide which can be moved on a machine frame in the clamping direction to a block stop which can preferably be adjusted via a central control according to the size of a workpiece to be clamped, and a form and which supports the mold clamping jaws in the clamping direction and can be moved Have tension slides.
  • the use of the mold clamping jaw according to the invention is also possible on a conventional vice. All that needs to be done is to fasten the base body of the mold clamping jaw to the clamping jaw of the vice.
  • Workpieces are clamped with the mold clamping jaws according to the invention in that the base body is first displaced against the workpiece and the clamping surface is deformed while automatically adapting to the contour of the workpiece surface, and in that the clamping surface is made non-deformable relative to the base body after clamping position and under clamping of the workpiece with a predetermined holding force is pressed against its surface.
  • This ensures that workpieces with largely any, even complicated, surface contours can be gripped in a force-locking and form-fitting manner with fully automatic handling under automatic tolerance compensation with a large-area system.
  • the mold clamping jaw 10 shown in the drawing consists essentially of a base body 12 and a clamping surface 14 which is composed of a plurality of pressure pieces 16 made of elastomeric material which can be displaced independently of one another relative to the base body 12.
  • the pressure pieces 16 are arranged at one end of a tensioning plunger 18, which is mounted in a slide guide 20 of the base body 12 so as to be displaceable in the stroke direction.
  • the clamping plungers 18 are moved hydraulically with their pressure pieces 16 into their starting position shown in FIG. 2 and locked in their clamping position with a hydraulically actuated shut-off valve 70.
  • the tappets 18 engage with a tappet piston 72 arranged at their rear end in a tappet cylinder 74 within the base body 12, which can be acted upon with hydraulic fluid via a hydraulic distributor 76 and the valve opening 80 delimited by the conical seat 78 of the shut-off valve 70.
  • the ram cylinders 74 preferably communicate with the ambient air via a distributor space 82 and the opening 84 '.
  • the valve needle 84 of the shut-off valve 70 is actuated via a control piston 90, which is guided in a control cylinder 86 and can be acted upon on both sides with hydraulic fluid from the distribution chambers 76 and 88.
  • the base body 12 is composed of a plurality of block-shaped or disk-shaped components which are connected to one another by means of a plurality of clamping screws 50 which are distributed over the circumference.
  • the clamping cylinders 74 are located in a common cylinder block 92, which is closed on the rod side by a cover plate 94 containing the slide guides 20 for the plungers 18 and an intermediate plate 96 containing the connection 84 'and the distributor space 82.
  • Is located on the bottom broad side surface of the cylinder block 92 a valve plate 98 with the valve seats 78, the valve openings 80 and a hydraulic connection 100 leading to the distributor space 76.
  • valve plate 98 On the side of the valve plate 98 opposite the cylinder block there is a cylinder plate 102 with the control cylinders 86 for receiving the control piston 90, which are additionally provided with recesses on the front Formation of the hydraulic distributor 76, 88 and a connection 104 leading to the hydraulic distributor 88 is provided and is closed on the outside by a base plate 106.
  • the function of the hydraulic mold clamping jaw is as follows: To extend the clamping plunger 18 into its starting position shown in FIG. 2, the distributor space 76 is pressurized with pressure oil via the connection 100, while the distributor space 88 is connected to the tank. As a result, the control pistons 90 with the valve needles 84 move from their blocking position shown in FIG. 3 into the open position according to FIG. 2. In this position, pressure oil passes from the distributor space 76 into the tappet cylinder 74 and drives the tappet 18 into its in FIG. 2 shown starting position.
  • the mold clamping jaw 10 is moved with its pressure pieces 16 against a surface to be clamped, the distributor space 76 being opened with the valves 70 open to the tank or against an elastic pressure accumulator in such a way that hydraulic fluid can be displaced from the clamping cylinders 74.
  • the distributor space 88 is pressurized via the connection 104 with pressure oil and thereby the valves 70 in their Locked position brought.
  • a certain hydraulic pressure can also be maintained in the distributor space 76.

Abstract

PCT No. PCT/EP92/02687 Sec. 371 Date Jul. 25, 1994 Sec. 102(e) Date Jul. 25, 1994 PCT Filed Nov. 23, 1992 PCT Pub. No. WO93/14907 PCT Pub. Date Aug. 5, 1993A profiled clamping jaw for a clamping device has a base body (12) and a clamping surface (14) arranged on the base body and adaptable to the surface profile of a workpiece (54). To make it possible to adapt by simple means the clamping surface (14) of the profiled clamping jaw (10) to the surface profile of the workpiece, the claiming surface (14) is composed of a plurality of pressure pieces (16) movable with respect to the base body (12) and capable of being locked thereon in a determined clamping position.

Description

Die Erfindung betrifft einen Formspannbacken zum Einspannen von Werkstücken der im Oberbegriff des Patentanspruchs 1 angegebenen Gattung.The invention relates to a mold jaw for clamping workpieces of the type specified in the preamble of claim 1.

Spannbacken sind Bestandteile von Spannvorrichtungen, wie sie beispielsweise in Schraubstöcken, Werkzeugmaschinen oder Bearbeitungszentren zum Festhalten von Werkstücken benötigt werden. Zum Spannen von Profilstäben insbesondere für den Fenster-, Türen- oder Fassadenbau werden bisher Formspannbacken verwendet, die in ihrer Oberflächenkontur der Kontur des einzuspannenden Werkstücks angepaßt sind. Für jeden Werkstücktypus wird also ein spezieller Formspannbacken hergestellt, der im Falle eines Wechsels des zu bearbeitenden Werkstücks in der betreffenden Spannvorrichtung ausgetauscht werden muß. Die bekannten Formspannbacken sind daher wegen der hohen Umrüstzeiten nur in der Serienfertigung bei mittleren und größeren Losgrößen von mindestens 200 Stück, nicht jedoch in der Einzel- oder Kleinserienfertigung wirtschaftlich einsetzbar. Dies gilt besonders für den Einsatz bei großen Reihenbohr- und Fräsmaschinen, in denen eine Vielzahl Spannvorrichtungen mit Formspannbacken zum Einsatz kommen.Clamping jaws are components of clamping devices, such as those required in vices, machine tools or machining centers for holding workpieces. For clamping profile bars, in particular for window, door or facade construction, mold clamping jaws have so far been used, the surface contour of which is adapted to the contour of the workpiece to be clamped. For each type of workpiece, therefore, a special mold clamping jaw is produced, which must be exchanged in the relevant clamping device if the workpiece to be machined is changed. Because of the long changeover times, the known mold clamping jaws can therefore only be used economically in series production with medium and large batch sizes of at least 200 pieces, but not in single or small series production. This applies in particular to use with large row drilling and milling machines, in which a large number of clamping devices with form clamping jaws are used.

Um diesen Nachteil zu vermeiden, sind Formspannbacken bekannt (US-A-3 211 445), die einen Grundkörper und eine am Grundkörper angeordnete, durch Verschieben des Grundkörpers gegen ein Werkstück bis zum Erreichen einer Spannstellung verformbare und dabei selbsttätig an die Kontur der Werkstückoberfläche anpaßbare Spannfläche aufweisen. Die Spannfläche ist dabei aus einer Vielzahl von relativ zum Grundkörper unabhängig voneinander verschiebbaren und an diesem in der Spannstellung arretierbaren Druckstücken zusammengesetzt. Jedes Druckstück ist mit einem Spannstößel in einer Schubführung des Grundkörpers geführt, wobei die Spannstößel je einen in einen Stößelzylinder des Grundkörpers eingreifenden Stößelkolben tragen und die Stößelzylinder über einen gemeinsamen Hydraulikverteiler in Spannrichtung mit Hydraulikflüssigkeit beaufschlagbar sind. Beim bekannten Formspannbacken wird als nachteilig empfunden, daß die Druckstücke in ihrer Spannstellung nicht arretiert werden können.In order to avoid this disadvantage, mold clamping jaws are known (US Pat. No. 3,211,445) which have a base body and have a clamping surface which is arranged on the base body and can be deformed by moving the base body against a workpiece until a clamping position is reached and can thereby be automatically adapted to the contour of the workpiece surface. The clamping surface is composed of a multiplicity of pressure pieces which can be displaced independently of one another relative to the base body and can be locked thereon in the clamping position. Each pressure piece is guided with a tension plunger in a thrust guide of the base body, the tension plungers each carrying a plunger piston engaging in a plunger cylinder of the base body and the plunger cylinders being acted upon with hydraulic fluid in the tensioning direction via a common hydraulic distributor. In the known mold clamping jaws, it is felt to be disadvantageous that the pressure pieces cannot be locked in their clamping position.

Aus der US-A-2 399 824 und der US-A 3 868 102 ist es bei Formspannbacken zwar an sich bekannt, die Druckstücke bei Erreichen der Sperrstellung mittels handbetätigbarer Absperrventile zu arretieren. Im praktischen Betrieb kommt es aber immer wieder vor, daß einzelne Druckstücke durch das eingespannte Werkstück bei arretierten Absperrventilen mit einer erhöhten Anpreßkraft beaufschlagt werden. Dabei kann es zu einer lokalen punktweisen oder linienförmigen Drucküberhöhung des Werkstücks kommen, die zu einer Verschlechterung der Einspannung oder zu einer unerwünschten Verformung des Werkstücks führen kann.From US-A-2 399 824 and US-A 3 868 102 it is known per se for mold clamping jaws to lock the pressure pieces by means of manually operated shut-off valves when the locking position is reached. In practical operation, however, it happens again and again that individual pressure pieces are acted upon by the clamped workpiece when the shut-off valves are locked with an increased contact pressure. This can lead to a local point-by-point or line-shaped pressure increase of the workpiece, which can lead to a deterioration in the clamping or to an undesired deformation of the workpiece.

Ausgehend hiervon liegt der Erfindung die Aufgabe zugrunde, den Formspannbacken der eingangs angegebenen Art dahingehend zu verbessern, daß in einfacher Weise eine Anpassung an unterschiedliche Werkstückkonturen möglich ist.Proceeding from this, the object of the invention is to improve the mold jaws of the type specified at the outset in such a way that adaptation to different workpiece contours is possible in a simple manner.

Zur Lösung dieser Aufgabe werden die im Patentanspruch 1 angegebenen Merkmale vorgeschlagen. Vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung ergeben sich aus den Unteransprüchen.To achieve this object, the features specified in claim 1 are proposed. Advantageous refinements and developments of the invention result from the subclaims.

Der erfindungsgemäßen Lösung liegt der Gedanke zugrunde, daß zwischen den einzelnen Stößelzylindern und dem Hydraulikverteiler jeweils ein Absperrventil angeordnet ist und daß die Absperrventile mit dem gleichen Druck aus einem gemeinsamen Hydraulikverteiler beaufschlagt werden Um dies zu erreichen, wird gemäß der Erfindung vorgeschlagen, daß die Absperrventile je einen zweiseitig mit Hydraulikflüssigkeit beaufschlagbaren, in einem Steuerzylinder angeordneten Steuerkolben tragen und daß die Steuerkolben an ihren einander gegenüberliegen Kolbenflächen über zwei getrennte Hydraulikverteiler jeweils gemeinsam mit Hydraulikflüssigkeit beaufschlagbar sind.The solution according to the invention is based on the idea that a shut-off valve is arranged between the individual tappet cylinders and the hydraulic distributor and that the shut-off valves are acted on with the same pressure from a common hydraulic distributor. To achieve this, the invention proposes that the shut-off valves each carry a control piston which can be acted upon on both sides with hydraulic fluid and which is arranged in a control cylinder, and that the control pistons can be acted upon with hydraulic fluid at their opposite piston surfaces via two separate hydraulic distributors.

Die Stößelkolben können auf ihrer dem Hydraulikverteiler gegenüberliegenden Kolbenfläche mit Atmosphärendruck aus der Umgebungsluft beaufschlagt werden.The plunger pistons can operate at atmospheric pressure on their piston surface opposite the hydraulic distributor from the ambient air.

Die eine, vorzugsweise absperrventilseitige Kolbenfläche der Steuerkolben und die Stößelkolben werden zweckmäßig mit Hydraulikflüssigkeit aus dem gleichen Hydraulikverteiler beaufschlagt.The one, preferably shut-off valve-side piston surface of the control pistons and the tappet pistons are expediently acted upon by hydraulic fluid from the same hydraulic distributor.

Gemäß einer bevorzugten Ausgestaltung der Erfindung sind die einander zugeordneten Stößelzylinder und die Steuerzylinder koaxial zueinander ausgerichtet, so daß die Absperrventile über ihre Steuerkolben axial zu den Stößelzylindern betätigt werden.According to a preferred embodiment of the invention, the mutually associated tappet cylinders and the control cylinders are aligned coaxially with one another, so that the shut-off valves are actuated axially to the tappet cylinders via their control pistons.

Eine weitere bevorzugte Ausgestaltung sieht vor, daß die Hydrozylinder in einem gemeinsamen Zylinderblock angeordnet sind, während die Absperrventile in einer gemeinsamen, mit dem Zylinderblock verbundenen, vorzugsweise mit diesem verschraubten Ventilplatte angeordnet sind. Die Steuerzylinder können ihrerseits in einer gemeinsamen, mit der Ventilplatte verbundenen, vorzugsweise verschraubten, auf der der Ventilplatte gegenüberliegenden Seite durch eine Grundplatte verschlossenen Zylinderplatte angeordnet sein. Auf diese Weise ist es mit einfachen baulichen Mitteln möglich, den Hydraulikverteiler durch einen zwischen Ventilplatte und Zylinderplatte angeordneten freien Zwischenraum auszubilden, während zwischen Ventilplatte und Grundplatte zusätzlich ein zweiter, mit dem Steuerzylinder kommunizierender Hydraulikverteiler als freier Zwischenraum angeordnet werden kann. Auf der der Grundplatte gegenüberliegenden Seite kann eine den Zylinderblock verschließende, die Schubführung bildende Durchbrüche für den Durchgriff der Spannstößel aufweisende Deckplatte vorgesehen werden, wobei zwischen Deckplatte und Zylinderblock ein mit den Stößelzylindern verbundener, vorzugsweise mit der Atmosphäre kommunizierender freier Zwischenraum ausgespart werden kann.Another preferred embodiment provides that the hydraulic cylinders are arranged in a common cylinder block, while the shut-off valves are arranged in a common valve plate connected to the cylinder block, preferably screwed to it. The control cylinders can in turn be arranged in a common cylinder plate connected to the valve plate, preferably screwed, on the side opposite the valve plate closed by a base plate. In this way it is possible with simple structural means to design the hydraulic distributor through a free space arranged between the valve plate and the cylinder plate, while a second hydraulic distributor communicating with the control cylinder can additionally be arranged as a free space between the valve plate and the base plate. On the base plate On the opposite side, a cover plate, which closes the cylinder block and forms the thrust guide, can be provided for the passage of the tensioning plunger, wherein a free space, which is connected to the plunger cylinders and preferably communicates with the atmosphere, can be left out between the cover plate and the cylinder block.

Die erfindungsgemäßen Formspannbacken werden mit besonderem Vorteil in Spannvorrichtungen eingesetzt, die einen an einem Maschinengestell in Spannrichtung auf einen vorzugsweise über eine Zentralsteuerung nach Maßgabe der Größe eines einzuspannenden Werkstücks einstellbaren Blockanschlag verfahrbaren Blockschlitten und einen auf dem Blockschlitten in Spannrichtung verfahrbaren, den Formspannbacken tragenden Form- und Spannschlitten aufweisen. Grundsätzlich ist die Verwendung des erfindungsgemäßen Formspannbacken auch an einem herkömmlichen Schraubstock möglich. Dazu muß lediglich der Grundkörper des Formspannbackens am Spannbacken des Schraubstocks befestigt werden.The mold clamping jaws according to the invention are used with particular advantage in clamping devices which have a block slide which can be moved on a machine frame in the clamping direction to a block stop which can preferably be adjusted via a central control according to the size of a workpiece to be clamped, and a form and which supports the mold clamping jaws in the clamping direction and can be moved Have tension slides. In principle, the use of the mold clamping jaw according to the invention is also possible on a conventional vice. All that needs to be done is to fasten the base body of the mold clamping jaw to the clamping jaw of the vice.

Das Einspannen von Werkstücken erfolgt mit dem erfindungsgemäßen Formspannbacken dadurch, daß zunächst der Grundkörper gegen das Werkstück verschoben und dabei die Spannfläche unter selbsttätiger Anpassung an die Kontur der Werkstückoberfläche verformt wird, und daß die Spannfläche nach Erreichen einer Spannstellung relativ zum Grundkörper unverformbar gestellt und unter Einspannen des Werkstücks mit einer vorgegebenen Haltekraft gegen dessen Oberfläche gedrückt wird. Damit wird erreicht, daß Werkstücke mit weitgehend beliebigen, auch komplizierten Oberflächenkonturen unter automatischem Toleranzausgleich mit großflächiger Anlage bei vollautomatischer Handhabung kraft- und formschlüssig erfaßt werden können.Workpieces are clamped with the mold clamping jaws according to the invention in that the base body is first displaced against the workpiece and the clamping surface is deformed while automatically adapting to the contour of the workpiece surface, and in that the clamping surface is made non-deformable relative to the base body after clamping position and under clamping of the workpiece with a predetermined holding force is pressed against its surface. This ensures that workpieces with largely any, even complicated, surface contours can be gripped in a force-locking and form-fitting manner with fully automatic handling under automatic tolerance compensation with a large-area system.

Im folgenden wird die Erfindung anhand des in der Zeichnung in schematischer Weise dargestellten Ausführungsbeispiels näher erläutert. Es zeigen

Fig. 1
eine Draufsicht auf einen Formspannbacken mit hydraulisch betätigbaren Spannstößeln;
Fig. 2
eine teilweise geschnittene Seitenansicht des Formspannbackens nach Fig. 1;
Fig. 3
einen Ausschnitt aus Fig. 2 in vergrößerter Darstellung.
The invention is explained in more detail below on the basis of the exemplary embodiment shown schematically in the drawing. Show it
Fig. 1
a plan view of a mold jaws with hydraulically actuated plungers;
Fig. 2
a partially sectioned side view of the mold clamping jaw according to Fig. 1;
Fig. 3
a section of Fig. 2 in an enlarged view.

Der in der Zeichnung dargestellte Formspannbacken 10 besteht im wesentlichen aus einem Grundkörper 12 und einer Spannfläche 14, die aus einer Vielzahl von unabhängig voneinander relativ zum Grundkörper 12 verschiebbaren Druckstücken 16 aus elastomerem Material zusammengesetzt ist. Die Druckstücke 16 sind am einen Ende je eines Spannstößels 18 angeordnet, der in einer Schubführung 20 des Grundkörpers 12 in Hubrichtung verschiebbar gelagert ist.The mold clamping jaw 10 shown in the drawing consists essentially of a base body 12 and a clamping surface 14 which is composed of a plurality of pressure pieces 16 made of elastomeric material which can be displaced independently of one another relative to the base body 12. The pressure pieces 16 are arranged at one end of a tensioning plunger 18, which is mounted in a slide guide 20 of the base body 12 so as to be displaceable in the stroke direction.

Die Spannstößel 18 werden mit ihren Druckstücken 16 hydraulisch in ihre in Fig. 2 gezeigte Ausgangslage verschoben und mit einem hydraulisch betätigbaren Absperrventil 70 in ihrer Spannstellung arretiert. Zu diesem Zweck greifen die Stößel 18 mit einem an ihrem rückwärtigen Ende angeordneten Stößelkolben 72 in einen Stößelzylinder 74 innerhalb des Grundkörpers 12 ein, der bodenseitig über einen Hydraulikverteiler 76 und die durch den konischen Sitz 78 des Absperrventils 70 begrenzte Ventilöffnung 80 mit Hydraulikflüssigkeit beaufschlagbar ist. An ihrem stangenseitigen Ende kommunizieren die Stößelzylinder 74 über einen Verteilerraum 82 und die Öffnung 84' vorzugsweise mit der Umgebungsluft. Die Ventilnadel 84 des Absperrventils 70 wird über einen in einem Steuerzylinder 86 geführten, zweiseitig mit Hydraulikflüssigkeit aus den Verteilerkammern 76 und 88 beaufschlagbaren Steuerkolben 90 betätigt.The clamping plungers 18 are moved hydraulically with their pressure pieces 16 into their starting position shown in FIG. 2 and locked in their clamping position with a hydraulically actuated shut-off valve 70. For this purpose, the tappets 18 engage with a tappet piston 72 arranged at their rear end in a tappet cylinder 74 within the base body 12, which can be acted upon with hydraulic fluid via a hydraulic distributor 76 and the valve opening 80 delimited by the conical seat 78 of the shut-off valve 70. At their rod end, the ram cylinders 74 preferably communicate with the ambient air via a distributor space 82 and the opening 84 '. The valve needle 84 of the shut-off valve 70 is actuated via a control piston 90, which is guided in a control cylinder 86 and can be acted upon on both sides with hydraulic fluid from the distribution chambers 76 and 88.

Wie insbesondere aus Fig. 3 zu ersehen ist, ist der Grundkörper 12 aus mehreren, block- oder scheibenförmigen Bauteilen zusammengesetzt, die durch mehrere, über den Umfang verteilt angeordnete Spannschrauben 50 miteinander verbunden sind. Die Spannzylinder 74 befinden sich dabei in einem gemeinsamen Zylinderblock 92, der stangenseitig durch eine die Schubführungen 20 für die Stößel 18 enthaltende Deckplatte 94 und eine den Anschluß 84' und den Verteilerraum 82 enthaltende Zwischenplatte 96 verschlossen ist. An der bodenseitigen Breitseitenfläche des Zylinderblocks 92 befindet sich eine Ventilplatte 98 mit den Ventilsitzen 78, den Ventilöffnungen 80 und einem zum Verteilerraum 76 führenden Hydraulikanschluß 100. Auf der dem Zylinderblock gegenüberliegenden Seite der Ventilplatte 98 befindet sich eine Zylinderplatte 102 mit den Steuerzylindern 86 zur Aufnahme der Steuerkolben 90, die zusätzlich mit stirnseitigen Ausnehmungen zur Bildung der Hydraulikverteiler 76,88 sowie einem zum Hydraulikverteiler 88 führenden Anschluß 104 versehen und außenseitig durch eine Grundplatte 106 verschlossen ist.As can be seen in particular from FIG. 3, the base body 12 is composed of a plurality of block-shaped or disk-shaped components which are connected to one another by means of a plurality of clamping screws 50 which are distributed over the circumference. The clamping cylinders 74 are located in a common cylinder block 92, which is closed on the rod side by a cover plate 94 containing the slide guides 20 for the plungers 18 and an intermediate plate 96 containing the connection 84 'and the distributor space 82. Is located on the bottom broad side surface of the cylinder block 92 a valve plate 98 with the valve seats 78, the valve openings 80 and a hydraulic connection 100 leading to the distributor space 76. On the side of the valve plate 98 opposite the cylinder block there is a cylinder plate 102 with the control cylinders 86 for receiving the control piston 90, which are additionally provided with recesses on the front Formation of the hydraulic distributor 76, 88 and a connection 104 leading to the hydraulic distributor 88 is provided and is closed on the outside by a base plate 106.

Die Funktion des hydraulischen Formspannbackens ist wie folgt: Zum Ausfahren der Spannstößel 18 in ihre in Fig. 2 gezeigte Ausgangslage wird der Verteilerraum 76 über den Anschluß 100 mit Drucköl beaufschlagt, während der Verteilerraum 88 mit dem Tank verbunden wird. Dadurch bewegen sich die Steuerkolben 90 mit den Ventilnadeln 84 von ihrer in Fig. 3 gezeigten Sperrstellung in die Durchlaßstellung gemäß Fig. 2. In dieser Stellung gelangt Drucköl aus dem Verteilerraum 76 in die Stößelzylinder 74 und treibt die Stößel 18 in ihre in Fig. 2 gezeigte Ausgangsstellung. Bei einem Spannvorgang wird der Formspannbacken 10 mit seinen Druckstücken 16 gegen eine einzuspannende Oberfläche bewegt, wobei der Verteilerraum 76 bei geöffneten Ventilen 70 zum Tank oder gegen einen elastischen Druckspeicher so geöffnet ist, daß Hydraulikflüssigkeit aus den Spannzylindern 74 verdrängt werden kann. Nach Erreichen der Spannstellung wird der Verteilerraum 88 über den Anschluß 104 mit Drucköl beaufschlagt und dadurch die Ventile 70 in ihre Sperrstellung gebracht. Um Leckströme aus den Spannzylindern zu vermeiden, kann auch im Verteilerraum 76 noch ein gewisser Hydraulikdruck aufrechterhalten werden.The function of the hydraulic mold clamping jaw is as follows: To extend the clamping plunger 18 into its starting position shown in FIG. 2, the distributor space 76 is pressurized with pressure oil via the connection 100, while the distributor space 88 is connected to the tank. As a result, the control pistons 90 with the valve needles 84 move from their blocking position shown in FIG. 3 into the open position according to FIG. 2. In this position, pressure oil passes from the distributor space 76 into the tappet cylinder 74 and drives the tappet 18 into its in FIG. 2 shown starting position. During a clamping operation, the mold clamping jaw 10 is moved with its pressure pieces 16 against a surface to be clamped, the distributor space 76 being opened with the valves 70 open to the tank or against an elastic pressure accumulator in such a way that hydraulic fluid can be displaced from the clamping cylinders 74. After reaching the clamping position, the distributor space 88 is pressurized via the connection 104 with pressure oil and thereby the valves 70 in their Locked position brought. To avoid leakage currents from the clamping cylinders, a certain hydraulic pressure can also be maintained in the distributor space 76.

Claims (11)

  1. A profiled clamping jaw for a clamping device comprising a base body (12) and a clamping surface (14) arranged on the base body, shapable by moving the base body (12) toward a workpiece (54) until a clamping position is reached, and thereby automatically adaptable to the contour of a workpiece surface, which clamping surface is composed of a plurality of thrust pieces, which are movable independently from one another relative to the base body and can be locked in a clamping position on said base body, with each thrust piece (16) being guided with a clamping ram (18) in a sliding guide (20) of the base body (12), the clamping rams (18) each carrying a ram piston (72) engaging a ram cylinder (74) of the base body (12), and the ram cylinders (74) being loadable through a common hydraulic distributor (76) in clamping direction with hydraulic fluid, characterized in that between the individual ram cylinders (74) and the hydraulic distributor (76) there is arranged each one check valve (70), and that the check valves (70) each carry one control piston (90) loadable on two sides with hydraulic fluid and arranged in a control cylinder (86), and that the control pistons (90) can be loaded together with hydraulic fluid on their piston surfaces, which are opposite to one another, through two separate hydraulic distributors (76, 88).
  2. The profiled clamping jaw according to Claim 1, characterized in that the ram pistons (72) are loaded with atmospheric pressure preferably from the surrounding air at their piston surface opposite the hydraulic distributor (76).
  3. The profiled clamping jaw according to Claim 1 or 2, characterized in that the ram pistons (72) and the piston surfaces of the control pistons (90), which piston surfaces are preferably on the side of the check valve, can be loaded with hydraulic fluid from the same hydraulic distributor (76).
  4. The profiled clamping jaw according to one of the Claims 1 to 3, characterized in that the ram cylinders (74) and control cylinders (86), which are associated with one another, are aligned axially parallel, preferably coaxially with one another.
  5. The profiled clamping jaw according to one of the Claims 1 to 4, characterized in that the hydrocylinders (74) are arranged in a common cylinder block (92).
  6. The profiled clamping jaw according to Claim 5, characterized in that the check valves (70) are arranged in a common valve plate (98), which is connected, preferably screwed, to the cylinder block (92).
  7. The profiled clamping jaw according to Claim 5 or 6, characterized in that the control cylinders (74) are arranged in one common cylinder plate (102) connected, preferably screwed, to the valve plate (98), and closed off on the side opposite the valve plate with a base plate (106).
  8. The profiled clamping jaw according to Claim 7, characterized in that between the valve plate (98) and the cylinder plate (102) there is arranged a free space forming the hydraulic distributor (76).
  9. The profiled clamping jaw according to Claim 7 or 8, characterized by a free space arranged between the valve plate (102) and the base plate (106) and forming a second hydraulic distributor (88) communicating with the control cylinders (86).
  10. The profiled clamping jaw according to one of the Claims 1 to 9, characterized by a cover plate (94, 96) closing off the cylinder block on the side of the thrust piece and having openings (20) for passage of the clamping rams (18).
  11. The profiled clamping jaw according to Claim 10, characterized in that between the cover plate (94, 96) and the cylinder block (92) there is arranged a space (82) connected to the ram cylinders (74) on the side of the rod and preferably communicating with the atmosphere.
EP92923770A 1992-01-25 1992-11-23 Profiled clamping jaw and process for clamping workpieces Expired - Lifetime EP0623065B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4202032 1992-01-25
DE4202032 1992-01-25
PCT/EP1992/002687 WO1993014907A1 (en) 1992-01-25 1992-11-23 Profiled clamping jaw and process for clamping workpieces

Publications (2)

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EP0623065A1 EP0623065A1 (en) 1994-11-09
EP0623065B1 true EP0623065B1 (en) 1997-04-02

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EP92923770A Expired - Lifetime EP0623065B1 (en) 1992-01-25 1992-11-23 Profiled clamping jaw and process for clamping workpieces

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US (1) US5551677A (en)
EP (1) EP0623065B1 (en)
JP (1) JPH07502935A (en)
AT (1) ATE151000T1 (en)
DE (1) DE59208305D1 (en)
DK (1) DK0623065T3 (en)
ES (1) ES2101130T3 (en)
WO (1) WO1993014907A1 (en)

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Also Published As

Publication number Publication date
JPH07502935A (en) 1995-03-30
DE59208305D1 (en) 1997-05-07
ATE151000T1 (en) 1997-04-15
US5551677A (en) 1996-09-03
EP0623065A1 (en) 1994-11-09
ES2101130T3 (en) 1997-07-01
DK0623065T3 (en) 1997-10-20
WO1993014907A1 (en) 1993-08-05

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