EP1277541A1 - Clamping element for positionflexible clamping a workpiece - Google Patents

Clamping element for positionflexible clamping a workpiece Download PDF

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Publication number
EP1277541A1
EP1277541A1 EP02102026A EP02102026A EP1277541A1 EP 1277541 A1 EP1277541 A1 EP 1277541A1 EP 02102026 A EP02102026 A EP 02102026A EP 02102026 A EP02102026 A EP 02102026A EP 1277541 A1 EP1277541 A1 EP 1277541A1
Authority
EP
European Patent Office
Prior art keywords
clamping
insert
workpiece
housing
piston
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP02102026A
Other languages
German (de)
French (fr)
Other versions
EP1277541B8 (en
EP1277541B1 (en
Inventor
Rudolf Kohlert
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.)
A Roemheld GmbH and Co KG
Original Assignee
A Roemheld GmbH and Co KG
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 A Roemheld GmbH and Co KG filed Critical A Roemheld GmbH and Co KG
Publication of EP1277541A1 publication Critical patent/EP1277541A1/en
Application granted granted Critical
Publication of EP1277541B1 publication Critical patent/EP1277541B1/en
Publication of EP1277541B8 publication Critical patent/EP1277541B8/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B25B5/00—Clamps
    • B25B5/06—Arrangements for positively actuating jaws
    • B25B5/12—Arrangements for positively actuating jaws using toggle links
    • B25B5/122—Arrangements for positively actuating jaws using toggle links with fluid drive
    • 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
    • B25B5/00—Clamps
    • B25B5/006—Supporting devices for clamps
    • 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
    • B25B5/00—Clamps
    • B25B5/06—Arrangements for positively actuating jaws
    • B25B5/061—Arrangements for positively actuating jaws with fluid drive
    • 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
    • B25B5/00—Clamps
    • B25B5/06—Arrangements for positively actuating jaws
    • B25B5/061—Arrangements for positively actuating jaws with fluid drive
    • B25B5/064—Arrangements for positively actuating jaws with fluid drive with clamping means pivoting around an axis perpendicular to the pressing direction
    • 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
    • B25B5/00—Clamps
    • B25B5/16—Details, e.g. jaws, jaw attachments

Definitions

  • the invention relates to a clamping element for positionally flexible clamping of workpieces with hydraulically actuated clamping jaws which are attached to the workpiece approachable and fixable and the tensioning element to a floating Make element.
  • Clamping elements are used for clamping workpieces to the Firmly fix workpiece against all machining forces. Here it is required to pick up the workpiece positioned and in this position clamp and furthermore support it everywhere with clamping elements where due to the Machining forces distortions or deformations of the workpiece done can.
  • These clamping elements which help to tighten the clamping process are preferably used, must be designed so that they are applied to the the workpiece does not generate any transverse forces that a predetermined position of the Workpiece influence.
  • clamping elements are usually actuated hydraulically to the workpiece moved up.
  • This approach requires a balance between the opposite clamping jaws, so that they with equal force on the workpiece come to the concern.
  • the hydraulic system via only one pressure line Drive members and the jaws fed equally, so that the Force distribution between the jaws takes place via the hydraulic system.
  • the Clamping jaws that first touches the workpiece remains due to the workpiece outgoing resistance while the other clamping jaws continue, until it also rests against the workpiece. Now builds up between two jaws evenly applied pressure on the workpiece. Act on the Workpiece forces greater than those generated solely by the hydraulics Holding forces are, it comes to deformations of the workpiece and to Impairment of the machining process.
  • the known clamping elements are due to their design with considerable Frictional forces loaded. This is partly due to seals in the Hydraulic area are required and the cylindrical parts against each other seal as they move together. Large dimensions lead to large masses of moving parts and thus also to inertial forces, by the Deformations on the workpiece do not fail, resulting in manufacturing inaccuracies leads. In addition, the clamping range of such elements is not all Customizable applications, resulting in elements of different sizes Processing of different workpieces are required.
  • the clamping element a large clamping range assign, the different workpieces is adaptable and the forces in so initiate the tensioning operation so that they cause the workpiece to settle, without affecting this in its positioned position and that in the workpiece initiated holding forces during the machining process regardless of to maintain external influences.
  • Fig. 1 the element is shown in section.
  • the stationary housing 1 is a Clamping insert 2 guided.
  • This clamping insert 2 has a rectangular cross-section and is inserted into the housing so that it protrudes from the housing on one side. Accordingly, the housing 1 is provided on one side with a recess. To guide the clamping insert 2, this is on the side of the housing opening with provided oblique guide surfaces 4 and the housing 1 with inward directed bevels 5.
  • the clamping insert 2 in the housing 1 on the sides and sliding contact surfaces.
  • the piston 3 In clamping insert 2, the piston 3 is guided.
  • the piston 3 has at its head a Dome 6, in which a ball 7 is mounted as part of a connecting rod 8.
  • To the connecting rod 8 includes a second ball 9, which in a cap 10 of a clamping lever 11th is introduced.
  • the tensioning lever 11 has a pivot 12, located in the upper part of the clamping insert 2 is located.
  • the piston 3 has two pressure chambers, of which the pressure chamber 13 for clamping and the pressure chamber 14 for relaxing serve. The pressure chambers are connected via two flexible pressure lines over the Terminals 15 and 16 fed.
  • the clamping insert 2 is at its lying in the housing recess side with a plurality of position holes 17 provided along the side surface in this are admitted.
  • position pins 18 can be used.
  • the position holes are introduced at a predetermined distance, which is results from the use cases.
  • the position holes serve to the Maximalhub 19 of the clamping system to reduce and the respective adapted workpiece.
  • These jaws are provided with corresponding fitting holes, in each case a positioning pin fits, so that the clamping jaws 20, 21 in the position holes 17 arbitrarily insertable and by means of threaded bolts in appropriate Tapped holes 23 can be fixed.
  • Clamping piston 24 is provided in the housing 1 in a cylinder bore.
  • This clamping piston 24 is designed so that it is in applied state on the outer wall of the clamping insert 2 presses.
  • the Clamping piston 24 is controlled separately, but it can also by means of a Sequence control depending on the completed clamping state to be actuated.
  • the piston 3 In the rest position, the piston 3 is moved down and the clamping insert 2 in his lowest position. Depending on the workpiece thickness of the clamping jaws 20 in the corresponding position holes brought and by means of the fine adjustment screw 22 adjusted to the workpiece. Only for large workpieces, the maximum stroke Claim 19 and can hang up directly on the jaws 21, deleted the clamping jaws 20.
  • the lever arm 11 is upwards in the vertical position pivoted and thus gives the space for the insertion of the workpiece 25 free.
  • the Clamping initiated.
  • the pressure chamber 13 is pressurized the Piston 3 moves upward and moves the clamping lever 11 in the pivot 12 on the Workpiece 25 too.
  • the connecting rod 8 with its balls 7, 9 ensures the balance of Movement sequence. This process continues until the tension lever 11 with his Pressure surface 26 rests on the workpiece 25. Now the workpiece offers the Clamping lever as a result of the resistance occurring stops in its movement. This clamping process goes without significant friction in the contact surfaces vonstatten. This means that the clamping lever 11 at its contact surface 26 also no significant force is introduced into the workpiece 25. The continue however, the upcoming hydraulic pressure moves the piston further upwards.
  • the clamping process acts optimally when the center of rotation and center of the ball 7 with the center of the pivot joint 12 and the contact point of the pressure surface 26th lying on a straight line.
  • the vertical stroke of the clamping insert can by appropriate measures, such as Longitudinal groove and screw are limited.
  • the tensioning element is as positionflexibles element and thus as a floating Element can be used.
  • a floating element suits it already preloaded workpiece and supports this at the points where Machining forces can act, for tension or even deformation contribute to the workpiece.
  • Figs. 5-7 show another element.
  • a clamping insert 30 is guided with a circular cross-section.
  • the piston 3 is introduced, which carries the connecting rod 8 with the balls 7: 9 and the clamping lever 11 at the head end via dome 6.
  • the clamping insert 30 has at the head end, the rotary joint 12 for the clamping lever 11 and a fixed cantilever jaw 31.
  • the workpiece 25 is inserted between the clamping jaw 31 and the clamping lever 11.
  • a clamping piston 32 which is, however, provided with a prismatic Anstell Design, the circular cross section of the clamping insert is adjusted.
  • the clamping piston 32 is controlled via its own pressure channel 47. In the tensioned state pushes the clamping piston the clamping insert against the housing inner bore and sets this with it.
  • the clamping insert is once by a virtually smooth guidance in the housing made smooth, the dirt wiper 33 no impairment represent, since they are just on the clamping insert to concern.
  • To the other two pipe springs 34, 35 are provided, which serve as feeders for the Serve hydraulics.
  • the two coil springs 34, 35 fit smoothly into the System by length depending on the direction of movement of the clamping insert or compress without generating a significant restoring force.
  • the introduction of the tube springs 34, 35 requires exact connections in terms of Hydraulic transitions.
  • the tube spring 34 is used for clamping and the tube spring 35th to relax the system.
  • For clamping the pressure chamber 13 is acted upon.
  • the hydraulic at the terminal 36 via the nipple 37 in the tube spring 34th passed and added via nipple 38 and channel 39 into the pressure chamber 13.
  • the Piston 3 moves up and puts the clamping lever 11 on the workpiece 25. Der Resistance to the workpiece 25 is sufficient to now the clamping insert 30 together with the piston 3 to go up until the jaw31 under the Workpiece 25 comes to rest. Now the pressure builds up on levers 11 and Jaws 31 equal to, whereby the clamping insert a firm connection received with the workpiece.
  • the clamping piston 32 is acted upon, the presses the clamping insert 30 against the housing and in this position in the Clamp housing 29.
  • Bourdon tube 35 To release 41 pressure in the Bourdon tube 35 is given via port 40 and nipple and from here the hydraulics via nipple 42 and channel 43 into the piston chamber 44th directed.
  • the clamping piston 32 by relieving the hydraulic pressure at 47 moved back by means of its diaphragm spring and the pressure chamber 13 without pressure been made.
  • the bourdon tubes are made of nipples and tabs Screwed.
  • the tube spring 35 is with her nipple 38 by means Brazing connected.
  • a pocket 45 is provided in which a movable roller 46 engages.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jigs For Machine Tools (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Laser Beam Processing (AREA)

Abstract

The clamping element has a clamping insert (2) which is inserted in a casing (1). The insert has a sliding piston (3) inside it. The clamping insert has dogs (20) and a clamping lever (11) pivoted via a connecting rod (8) to the piston. As the piston moves up, it presses the clamping lever onto the workpiece (25) and the clamping insert is lifted higher so that the dogs come under the workpiece, clamping it.

Description

Die Erfindung bezieht sich auf ein Spannelement zum positionsflexiblen Spannen von Werkstücken mit hydraulisch betätigten Spannbacken, die an das Werkstück heranfahrbar und festsetzbar sind und das Spannelement zu einem schwimmenden Element machen.The invention relates to a clamping element for positionally flexible clamping of workpieces with hydraulically actuated clamping jaws which are attached to the workpiece approachable and fixable and the tensioning element to a floating Make element.

Spannelemente werden zum Spannen von Werkstücken eingesetzt, um das Werkstück gegen alle Bearbeitungskräfte unverrückbar festzusetzen. Hier ist es erforderlich, das Werkstück positioniert aufzunehmen und in dieser Lage zu spannen und ferner überall dort mit Spannelementen abzustützen, wo infolge der Bearbeitungskräfte Verspannungen oder Verformungen des Werkstückes erfolgen können. Diese Spannelemente, die zur Unterstützung des Spannvorganges bevorzugt eingesetzt werden, müssen so gestaltet sein, dass sie beim Anlegen an das Werkstück keine Querkräfte erzeugen, die eine vorgegebene Lage des Werkstückes beeinflussen.Clamping elements are used for clamping workpieces to the Firmly fix workpiece against all machining forces. Here it is required to pick up the workpiece positioned and in this position clamp and furthermore support it everywhere with clamping elements where due to the Machining forces distortions or deformations of the workpiece done can. These clamping elements, which help to tighten the clamping process are preferably used, must be designed so that they are applied to the the workpiece does not generate any transverse forces that a predetermined position of the Workpiece influence.

Diese Spannelemente werden in der Regel hydraulisch betätigt an das Werkstück herangefahren. Dieses Heranfahren bedingt einen Ausgleich zwischen den gegenüber liegenden Spannbacken, damit diese mit gleicher Kraft am Werkstück zum Anliegen kommen. Hierzu wird die Hydraulik über nur eine Druckleitung den Antriebsorganen und den Spannbacken gleichermaßen zugeführt, so dass die Kraftverteilung zwischen den Spannbacken über die Hydraulik erfolgt. Der Spannbacken, der zuerst das Werkstück berührt, bleibt infolge des vom Werkstück ausgehenden Widerstandes stehen, während der andere Spannbacken weiterfährt, bis auch er am Werkstück anliegt. Nun baut sich zwischen beiden Spannbacken ein gleichmäßig auf das Werkstück einwirkender Druck auf. Wirken jedoch auf das Werkstück Kräfte ein, die größer als die allein durch die Hydraulik erzeugten Haltekräfte sind, kommt es zu Verformungen des Werkstückes und zu Beeinträchtigungen des Bearbeitungsablaufes.These clamping elements are usually actuated hydraulically to the workpiece moved up. This approach requires a balance between the opposite clamping jaws, so that they with equal force on the workpiece come to the concern. For this purpose, the hydraulic system via only one pressure line Drive members and the jaws fed equally, so that the Force distribution between the jaws takes place via the hydraulic system. Of the Clamping jaws that first touches the workpiece remains due to the workpiece outgoing resistance while the other clamping jaws continue, until it also rests against the workpiece. Now builds up between two jaws evenly applied pressure on the workpiece. Act on the Workpiece forces greater than those generated solely by the hydraulics Holding forces are, it comes to deformations of the workpiece and to Impairment of the machining process.

Die bekannten Spannelemente sind aufgrund ihrer Bauweise mit erheblichen Reibungskräften belastet. Dieses beruht zum Teil auf Dichtungen, die im Hydraulikbereich erforderlich sind und die zylinderische Teile gegeneinander abdichten, während diese sich gemeinsam bewegen. Große Baumaße führen zu großen Massen der beweglichen Teile und damit auch zu Trägheitskräften, durch die Verformungen am Werkstück nicht ausbleiben, was zu Fertigungsungenauigkeiten führt. Darüber hinaus ist der Spannbereich solcher Elemente nicht allen Anwendungen anpassbar, was dazu führt, dass Elemente verschiedener Größe zur Bearbeitung verschiedener Werkstücke erforderlich werden.The known clamping elements are due to their design with considerable Frictional forces loaded. This is partly due to seals in the Hydraulic area are required and the cylindrical parts against each other seal as they move together. Large dimensions lead to large masses of moving parts and thus also to inertial forces, by the Deformations on the workpiece do not fail, resulting in manufacturing inaccuracies leads. In addition, the clamping range of such elements is not all Customizable applications, resulting in elements of different sizes Processing of different workpieces are required.

Es ist somit Aufgabe der Erfindung, dem Spannelement einen großen Spannbereich zuzuordnen, der unterschiedlichen Werkstücken anpassbar ist und die Kräfte so in den Spannvorgang einzuleiten, dass sie das Festsetzen des Werkstückes bewirken, ohne dieses in seiner positionierten Lage zu beeinflussen und die in das Werkstück eingeleiteten Haltekräfte während des Bearbeitungsvorganges unabhängig von äusseren Einflüssen aufrecht zu erhalten.It is therefore an object of the invention, the clamping element a large clamping range assign, the different workpieces is adaptable and the forces in so initiate the tensioning operation so that they cause the workpiece to settle, without affecting this in its positioned position and that in the workpiece initiated holding forces during the machining process regardless of to maintain external influences.

Die Lösung der Aufgabe ist den kennzeichnenden Merkmalen der Ansprüche zu entnehmen. Die Erfindung ist in den Zeichnungen beschrieben.

Fig. 1
zeigt ein Element im Längsschnitt
Fig. 2
zeigt einen Querschnitt
Fig. 3
zeigt eine Seitenansicht
Fig. 4
zeigt eine Seitenansicht
Fig. 5
zeigt ein Spannelement mit Rohrfedersystem
Fig. 6
zeigt eine Seitenansicht
Fig. 7
zeigt einen Querschnitt
The solution of the problem can be found in the characterizing features of the claims. The invention is described in the drawings.
Fig. 1
shows an element in longitudinal section
Fig. 2
shows a cross section
Fig. 3
shows a side view
Fig. 4
shows a side view
Fig. 5
shows a clamping element with pipe spring system
Fig. 6
shows a side view
Fig. 7
shows a cross section

In Fig. 1 ist das Element im Schnitt gezeigt. In dem feststehenden Gehäuse 1 ist ein Spanneinsatz 2 geführt. Dieser Spanneinsatz 2 hat einen Rechteckquerschnitt und ist so in das Gehäuse eingefügt, dass er einseitig aus dem Gehäuse herausragt. Dementsprechend ist das Gehäuse 1 an einer Seite mit einer Aussparung versehen. Zur Führung des Spanneinsatzes 2 ist dieser an der Seite der Gehäuseöffnung mit schrägen Führungsflächen 4 versehen und das Gehäuse 1 mit nach innen gerichteten Schrägen 5. Somit ist der Spanneinsatz 2 im Gehäuse 1 an den Seiten und Berührungsflächen gleitend geführt.In Fig. 1, the element is shown in section. In the stationary housing 1 is a Clamping insert 2 guided. This clamping insert 2 has a rectangular cross-section and is inserted into the housing so that it protrudes from the housing on one side. Accordingly, the housing 1 is provided on one side with a recess. To guide the clamping insert 2, this is on the side of the housing opening with provided oblique guide surfaces 4 and the housing 1 with inward directed bevels 5. Thus, the clamping insert 2 in the housing 1 on the sides and sliding contact surfaces.

Im Spanneinsatz 2 ist der Kolben 3 geführt. Der Kolben 3 weist an seinem Kopf eine Kalotte 6 auf, in der eine Kugel 7 als Teil eines Pleuels 8 gelagert ist. Zu dem Pleuel 8 gehört eine zweite Kugel 9, die in einer Kalotte 10 eines Spannhebels 11 eingebracht ist. Der Spannhebel 11 hat ein Drehgelenk 12, das sich im oberen Teil des Spanneinsatzes 2 befindet. Der Kolben 3 hat zwei Druckkammern, von denen die Druckkammer 13 zum Spannen und die Druckkammer 14 zum Entspannen dienen. Die Druckkammern werden über zwei flexible Druckleitungen über die Anschlüsse 15 und 16 gespeist. In clamping insert 2, the piston 3 is guided. The piston 3 has at its head a Dome 6, in which a ball 7 is mounted as part of a connecting rod 8. To the connecting rod 8 includes a second ball 9, which in a cap 10 of a clamping lever 11th is introduced. The tensioning lever 11 has a pivot 12, located in the upper part of the clamping insert 2 is located. The piston 3 has two pressure chambers, of which the pressure chamber 13 for clamping and the pressure chamber 14 for relaxing serve. The pressure chambers are connected via two flexible pressure lines over the Terminals 15 and 16 fed.

Der Spanneinsatz 2 ist an seiner in der Gehäuse-Aussparung liegenden Seite mit mehreren Positionsbohrungen 17 versehen, die längs der Seitenfläche in diese eingelassen sind. In diese Positionsbohrungen 17 sind Positionsstifte 18 einsetzbar. Die Positionsbohrungen sind in einem vorgegebenen Abstand eingebracht, der sich aus den Anwendungsfällen ergibt. Die Positionsbohrungen dienen dazu, den Maximalhub 19 des Spannsystems verringern zu können und dem jeweils eingesetzten Werkstück anzupassen. Diese Positionsbohrungen nehmen Spannbacken 20 und 21 auf, von denen der Spannbacken 20 mit einem Gewinde versehen ist, in das eine Feineinstellschraube 22 mit Festsetzmutter eingefügt ist. Diese Spannbacken sind mit entsprechenden Passbohrungen versehen, in die jeweils ein Positionsstift passt, so dass die Spannbacken 20, 21 in den Positionsbohrungen 17 beliebig einfügbar und mittels Gewindebolzen in entsprechenden Gewindebohrungen 23 festsetzbar sind.The clamping insert 2 is at its lying in the housing recess side with a plurality of position holes 17 provided along the side surface in this are admitted. In this position holes 17 position pins 18 can be used. The position holes are introduced at a predetermined distance, which is results from the use cases. The position holes serve to the Maximalhub 19 of the clamping system to reduce and the respective adapted workpiece. Take these position holes Clamping jaws 20 and 21, of which the clamping jaws 20 with a thread is provided, in which a fine adjustment screw 22 is inserted with fixing nut. These jaws are provided with corresponding fitting holes, in each case a positioning pin fits, so that the clamping jaws 20, 21 in the position holes 17 arbitrarily insertable and by means of threaded bolts in appropriate Tapped holes 23 can be fixed.

In dem Gehäuse 1 ist quer zum Spanneinsatz 2 in einer Zylinderbohrung ein Klemmkolben 24 vorgesehen. Dieser Klemmkolben 24 ist so ausgelegt, dass er im beaufschlagten Zustand auf die Außenwand des Spanneinsatzes 2 drückt. Der Klemmkolben 24 wird separat angesteuert, er kann aber auch mittels einer Folgesteuerung in Abhängigkeit vom vollzogenen Spannzustand betätigt werden.In the housing 1 is transverse to the clamping insert 2 in a cylinder bore Clamping piston 24 is provided. This clamping piston 24 is designed so that it is in applied state on the outer wall of the clamping insert 2 presses. Of the Clamping piston 24 is controlled separately, but it can also by means of a Sequence control depending on the completed clamping state to be actuated.

In der Ruhestellung ist der Kolben 3 nach unten gefahren und der Spanneinsatz 2 in seiner untersten Stellung. Je nach Werkstückdicke wird der Spannbacken 20 in die entsprechenden Positionsbohrungen gebracht und mittels der Feineinstellschraube 22 auf das Werkstück justiert. Nur bei großen Werkstücken, die den Maximal-Hub 19 beanspruchen und sich direkt auf den Spannbacken 21 auflegen lassen, entfällt der Spannbacken 20. Der Hebelarm 11 ist nach oben in die senkrechte Lage geschwenkt und gibt damit den Platz für das Einlegern des Werkstückes 25 frei.In the rest position, the piston 3 is moved down and the clamping insert 2 in his lowest position. Depending on the workpiece thickness of the clamping jaws 20 in the corresponding position holes brought and by means of the fine adjustment screw 22 adjusted to the workpiece. Only for large workpieces, the maximum stroke Claim 19 and can hang up directly on the jaws 21, deleted the clamping jaws 20. The lever arm 11 is upwards in the vertical position pivoted and thus gives the space for the insertion of the workpiece 25 free.

Ist das Werkstück dem Spannelement zum Spannen zugeordnet, wird der Spannvorgang eingeleitet. Die Druckkammer 13 wird mit Druck beaufschlagt der Kolben 3 fährt nach oben und bewegt den Spannhebel 11 im Drehgelenk 12 auf das Werkstück 25 zu. Das Pleuel 8 mit seinen Kugeln 7, 9 sorgt für den Ausgleich des Bewegungsablaufes. Dieser Vorgang geht so lange bis der Spannhebel 11 mit seiner Andruckfläche 26 auf dem Werkstück 25 aufliegt. Jetzt bietet das Werkstück dem Spannhebel infolge des auftretenden Widerstandes Einhalt in seiner Bewegung. Dieser Spannvorgang geht ohne nennenswerte Reibung in den Berührungsflächen vonstatten. Das bedeutet, dass vom Spannhebel 11 an seiner Andruckfläche 26 auch keine nennenswerte Kraft in das Werkstück 25 eingeleitet wird. Der weiterhin anstehende Hydraulikdruck bewegt jedoch den Kolben weiter nach oben. Durch die Abstützung des Spannhebel 11 auf dem Werkstück 25 wird nunmehr der Spanneinsatz 2 vom Kolben 3 mitgenommen und der Gelenkpunkt 12 nach oben geführt. Damit wird der Spannbacken 20 unten an das Werkstück 25 herangeführt und kommt zur Anlage. Dieser Vorgang wird durch die Feder 28 unterstützt, die vertikal eingefügt ist, so dass sie die Anhebung des Spanneinsatzes 2 unterstützt, indem sie das Gewicht des Spanneinsatzes aufnimmt. Liegt der Spannbacken 20 am Werkstück 25 an, besteht an dem Werkstück ein Druckausgleich zwischen der Andruckfläche 26 des Hebels 11 und der Andruckfläche 27 der Feineinstellschraube 22 und es baut sich am Werkstück ein beidseitig gleichmässiger Druck auf und der Spanneinsatz 2 geht dadurch eine feste Verbindung mit dem Werkstück ein.If the workpiece is assigned to the clamping element for clamping, the Clamping initiated. The pressure chamber 13 is pressurized the Piston 3 moves upward and moves the clamping lever 11 in the pivot 12 on the Workpiece 25 too. The connecting rod 8 with its balls 7, 9 ensures the balance of Movement sequence. This process continues until the tension lever 11 with his Pressure surface 26 rests on the workpiece 25. Now the workpiece offers the Clamping lever as a result of the resistance occurring stops in its movement. This clamping process goes without significant friction in the contact surfaces vonstatten. This means that the clamping lever 11 at its contact surface 26 also no significant force is introduced into the workpiece 25. The continue however, the upcoming hydraulic pressure moves the piston further upwards. By the Supporting the clamping lever 11 on the workpiece 25 is now the Clamping insert 2 taken from the piston 3 and the pivot point 12 upwards guided. Thus, the clamping jaw 20 is brought down to the workpiece 25 and comes to the plant. This process is supported by the spring 28, the is inserted vertically, so that it supports the lifting of the clamping insert 2, by taking the weight of the clamping insert. Is the jaw 20 on On workpiece 25, there is a pressure equalization between the Pressure surface 26 of the lever 11 and the pressure surface 27 of the fine adjustment screw 22 and it builds up on the workpiece on both sides even pressure and the Clamping insert 2 enters thereby a firm connection with the workpiece.

Dieser Spannvorgang wird so lange aufrecht erhalten, wie der Druck in der Zuleitung 15 ansteht. Der vertikal in seinen Führungen noch bewegliche Spanneinsatz wird nun in dem Gehäuse 1 festgesetzt. Dieses erfolgt durch Druckbeaufschlagung des Klemmkolbens 24, der einen Druck auf die Seitenfläche des Spanneinsatzes 2 ausübt und dadurch den Spanneinsatz 2 mit seinen Schrägen 5 gegen die Führungsflächen 4 des Gehäuses 1 presst. Der Klemmkolben 24 setzt somit den Spanneinsatz 2 im Gehäuse 1 und damit auch das Werkstück 25 fest.This clamping process is maintained as long as the pressure in the supply line 15 is pending. The vertically in his guides still movable clamping insert is now fixed in the housing 1. This is done by pressurizing the Clamping piston 24, the pressure on the side surface of the clamping insert. 2 exerts and thereby the clamping insert 2 with its slopes 5 against the Guide surfaces 4 of the housing 1 presses. The clamping piston 24 thus sets the Clamping insert 2 in the housing 1 and thus the workpiece 25 fixed.

Der Spannvorgang wirkt optimal, wenn der Dreh- und Mittelpunkt der Kugel 7 mit dem Mittelpunkt des Drehgelenks 12 und dem Auflagepunkt der Andruckfläche 26 auf einer Geraden liegen.The clamping process acts optimally when the center of rotation and center of the ball 7 with the center of the pivot joint 12 and the contact point of the pressure surface 26th lying on a straight line.

Zum Entspannen wird der Druck vom Klemmkolben 24 weggenommen, der über entsprechende Tellerfedern in seine Ausgangslage zurück geführt wird. Gleichzeitig wird die Druckkammer 13 entlastet und die Druckkammer 14 beaufschlagt, womit der Kolben 3 zurückgeführt wird, der Hebel 11 schwenkt in seine Ruhelage und das Werkstück 25 ist zur Entnahme frei gegeben.To relax the pressure is removed from the clamping piston 24, the over corresponding disc springs is returned to its original position. simultaneously the pressure chamber 13 is relieved and the pressure chamber 14 is applied, whereby the piston 3 is returned, the lever 11 pivots in its rest position and the Workpiece 25 is released for removal.

Der vertikale Hub des Spanneinsatzes kann durch entsprechende Maßnahmen, wie Längsnut und Schraube begrenzt werden.The vertical stroke of the clamping insert can by appropriate measures, such as Longitudinal groove and screw are limited.

Das Spannelement ist als positionsflexibles Element und damit als schwimmendes Element einsetzbar. Ein schwimmendes Element passt sich dem bereits vorgespannten Werkstück an und unterstützt dieses an den Stellen, an denen Bearbeitungskräfte einwirken können, die zur Verspannung oder gar Verformung des Werkstückes beitragen.The tensioning element is as positionflexibles element and thus as a floating Element can be used. A floating element suits it already preloaded workpiece and supports this at the points where Machining forces can act, for tension or even deformation contribute to the workpiece.

Die Fig. 5-7 zeigen ein weiteres Element.
In dem Gehäuse 29 ist ein Spanneinsatz 30 mit kreisförmigen Querschnitt geführt. Im Innern des Spanneinsatzes 30 ist der Kolben 3 eingebracht, der am Kopfende über Kalotte 6 das Pleuel 8 mit den Kugeln 7:9 und den Spannhebel 11 trägt. Der Spanneinsatz 30 hat am Kopfende das Drehgelenk 12 für den Spannhebel 11 und einen feststehenden auskragenden Spannbacken 31. Das Werkstück 25 ist zwischen dem Spannbacken 31 und dem Spannhebel 11 einlegbar.Figs. 5-7 show another element.
In the housing 29, a clamping insert 30 is guided with a circular cross-section. In the interior of the clamping insert 30, the piston 3 is introduced, which carries the connecting rod 8 with the balls 7: 9 and the clamping lever 11 at the head end via dome 6. The clamping insert 30 has at the head end, the rotary joint 12 for the clamping lever 11 and a fixed cantilever jaw 31. The workpiece 25 is inserted between the clamping jaw 31 and the clamping lever 11.

Zur Festsetzung des Spanneinsatzes 30 im Spannzustand dient ein Klemmkolben 32, der jedoch mit einer prismatischen Anstellfläche versehen ist, die dem kreisförmigen Querschnitt des Spanneinsatzes angepasst ist. Der Klemmkolben 32 wird über einen eigenen Druckkanal 47 angesteuert. Im gespannten Zustand drückt der Klemmkolben den Spanneinsatz gegen die Gehäuseinnenbohrung und setzt diesen damit fest.To fix the clamping insert 30 in the clamping state is a clamping piston 32, which is, however, provided with a prismatic Anstellfläche, the circular cross section of the clamping insert is adjusted. The clamping piston 32 is controlled via its own pressure channel 47. In the tensioned state pushes the clamping piston the clamping insert against the housing inner bore and sets this with it.

Der Spanneinsatz wird einmal durch eine nahezu reibungslose Führung im Gehäuse leichtgängig gemacht, wobei die Schmutzabstreifer 33 keine Beeinträchtigung darstellen, da sie gerade eben am Spanneinsatz zum Anliegen kommen. Zum anderen sind zwei Rohrfedern 34;35 vorgesehen, die als Zuführungen für die Hydraulik dienen. Die beiden Rohrfedern 34, 35 fügen sich reibungslos in das System ein, indem sie sich je nach Bewegungsrichtung des Spanneinsatzes längen oder stauchen ohne eine nennenswerte Rückstellkraft zu erzeugen.The clamping insert is once by a virtually smooth guidance in the housing made smooth, the dirt wiper 33 no impairment represent, since they are just on the clamping insert to concern. To the the other two pipe springs 34, 35 are provided, which serve as feeders for the Serve hydraulics. The two coil springs 34, 35 fit smoothly into the System by length depending on the direction of movement of the clamping insert or compress without generating a significant restoring force.

Die Einbringung der Rohrfedern 34, 35 bedingt exakte Anschlüsse hinsichtlich der Hydraulikübergänge. Die Rohrfeder 34 dient zum Spannen und die Rohrfeder 35 zum Entspannen des Systems. Zum Spannen wird der Druckraum 13 beaufschlagt. Hierzu wird die Hydraulik am Anschluß 36 über den Nippel 37 in die Rohrfeder 34 geleitet und über Nippel 38 und Kanal 39 in die Druckkammer 13 gegeben. Der Kolben 3 fährt hoch und legt den Spannhebel 11 auf das Werkstück 25. Der Widerstand am Werkstück 25 genügt um nunmehr den Spanneinsatz 30 zusammen mit dem Kolben 3 nach oben zu fahren, bis der Spannbacken31 unter dem Werkstück 25 zum Anliegen kommt. Jetzt baut sich der Druck am Hebel 11 und am Spannbacken 31 gleich groß auf, wodurch der Spanneinsatz eine feste Verbindung mit dem Werkstück eingeht. Nunmehr wird der Klemmkolben 32 beaufschlagt, der den Spanneinsatz 30 gegen die Gehäusewandung drückt und in dieser Stellung im Gehäuse 29 festklemmt.The introduction of the tube springs 34, 35 requires exact connections in terms of Hydraulic transitions. The tube spring 34 is used for clamping and the tube spring 35th to relax the system. For clamping the pressure chamber 13 is acted upon. For this purpose, the hydraulic at the terminal 36 via the nipple 37 in the tube spring 34th passed and added via nipple 38 and channel 39 into the pressure chamber 13. Of the Piston 3 moves up and puts the clamping lever 11 on the workpiece 25. Der Resistance to the workpiece 25 is sufficient to now the clamping insert 30 together with the piston 3 to go up until the jaw31 under the Workpiece 25 comes to rest. Now the pressure builds up on levers 11 and Jaws 31 equal to, whereby the clamping insert a firm connection received with the workpiece. Now, the clamping piston 32 is acted upon, the presses the clamping insert 30 against the housing and in this position in the Clamp housing 29.

Zum Lösen wird über Anschluß 40 und Nippel 41 Druck in die Rohrfeder 35 gegeben und von hier die Hydraulik über Nippel 42 und Kanal 43 in den Kolbenraum 44 geleitet. Zuvor ist der Klemmkolben 32 durch Entlastung des Hydraulikdruckes bei 47 mittels seiner Tellerfeder zurückgefahren und der Druckraum 13 drucklos gemacht worden. Die Rohrfedern werden von Nippeln und Laschen durch Verschraubung gehalten. Die Rohrfeder 35 ist mit ihrem Nippel 38 mittels Hartlötung verbunden.To release 41 pressure in the Bourdon tube 35 is given via port 40 and nipple and from here the hydraulics via nipple 42 and channel 43 into the piston chamber 44th directed. Previously, the clamping piston 32 by relieving the hydraulic pressure at 47 moved back by means of its diaphragm spring and the pressure chamber 13 without pressure been made. The bourdon tubes are made of nipples and tabs Screwed. The tube spring 35 is with her nipple 38 by means Brazing connected.

Um den Spanneinsatz vor Verdrehung zu schützen ist eine Tasche 45 vorgesehen, in die eine bewegliche Rolle 46 eingreift. Bezugszeichen 1 Gehäuse 31 Spannbacken 2 Spanneinsatz 32 Klemmkolben 3 Kolben 33 Schmutzabstreifer 4 Führungsfläche 34 Rohrfeder 5 Schräge 35 Rohrfeder 6 Kalotte 36 Hydraulikanschluss 7 Kugel 37 Nippel 8 Pleuel 38 Nippel 9 Kugel 39 Kanal 10 Kalotte 40 Anschluss 11 Spannhebel 41 Nippel 12 Drehgelenk 42 Nippel 13 Druckkammer 43 Kanal 14 Druckkammer 44 Kolbenraum 15 Druckanschluss 45 Tasche 16 Druckanschluss 46 Rolle 17 Positionsbohrung 47 Druckanschluss 18 Positionsstift 19 Maximalhub 20 Spannbacken 21 Spannbacken 22 Feineinstellschraube 23 Gewindebohrung 24 Klemmkolben 25 Werkstück 26 Andruckfläche 27 Andruckfläche 28 Feder 29 Gehäuse 30 Spanneinsatz To protect the clamping insert against rotation, a pocket 45 is provided in which a movable roller 46 engages. reference numeral 1 casing 31 jaws 2 Clamp insert 32 clamping piston 3 piston 33 wipers 4 guide surface 34 Bourdon tube 5 slope 35 Bourdon tube 6 dome 36 hydraulic connection 7 Bullet 37 nipple 8th pleuel 38 nipple 9 Bullet 39 channel 10 dome 40 connection 11 clamping lever 41 nipple 12 swivel 42 nipple 13 pressure chamber 43 channel 14 pressure chamber 44 piston chamber 15 pressure connection 45 bag 16 pressure connection 46 role 17 position hole 47 pressure connection 18 positioning pin 19 maximum stroke 20 jaws 21 jaws 22 fine adjustment screw 23 threaded hole 24 clamping piston 25 workpiece 26 pressure surface 27 pressure surface 28 feather 29 casing 30 Clamp insert

Claims (9)

Spannelement zum positionsflexiblen Spannen von Werkstücken mit hydraulisch betätigten Spannbacken, die an das Werkstück heranfahrbar und festsetzbar sind, dadurch gekennzeichnet, dass in einem Gehäuse (1;29) ein Spanneinsatz (2;30) mit innen liegendem Kolben (3) gleitend geführt ist, dass der Spanneinsatz (2;30) mit einem Spannbacken (20;31) versehen ist und über ein Drehgelenk (12) einen Spannhebel (11) aufnimmt, dass der Spannhebel (11) über ein Pleuel (8) gelenkig mit dem Kolben (3) verbunden ist und dass beim Spannvorgang der Kolben (3) den Spannhebel (11) auf das Werkstück (25) drückt und durch den vom Werkstück auf den Spannhebel wirkenden Widerstand den Spanneinsatz (2;30) anhebt und so den Spannbacken (20;31) unter das Werkstück fährt und durch den Kraftaufbau zwischen Spannhebel und Spannbacken das Werkstück mit dem Spanneinsatz eine feste Verbindung eingeht.Clamping element for positionally flexible clamping of workpieces with hydraulically actuated clamping jaws which are approachable and fixable to the workpiece, characterized in that in a housing (1, 29) a clamping insert (2, 30) is slidably guided with an internal piston (3), in that the clamping insert (2; 30) is provided with a clamping jaw (20; 31) and receives a clamping lever (11) via a pivot joint (12) such that the clamping lever (11) is articulated to the piston (3) via a connecting rod (8) ) and that during the clamping operation of the piston (3) the clamping lever (11) presses on the workpiece (25) and by the force acting on the clamping lever from the workpiece resistance of the clamping insert (2; 30) lifts and so the jaws (20; ) moves under the workpiece and the workpiece with the clamping insert enters into a firm connection by the force build-up between clamping lever and clamping jaws. Spannelement nach Anspruch 1, dadurch gekennzeichnet, dass das Gehäuse (1) an einer Seite eine Aussparung besitzt, dass der Spanneinsatz (2) in dieser Aussparung über im Gehäuse eingebrachte Schrägen (5) und über am Spanneinsatz angebrachte Führungsflächen (4) gleitend geführt ist und dass der Spanneinsatz (2) an seiner in der Aussparung liegenden Seite mit mehreren Positionsbohrungen (17) versehen ist, in denen positioniert die Spannbacken (20;21) aufnehmbar sind.Clamping element according to claim 1, characterized in that the housing (1) has a recess on one side, that the clamping insert (2) in this recess via slides introduced in the housing (5) and mounted on the clamping insert guide surfaces (4) is slidably guided and that the clamping insert (2) is provided on its side lying in the recess with a plurality of position bores (17) in which positioned, the clamping jaws (20; 21) are receivable. Spannelement nach den Ansprüchen 1 u. 2, dadurch gekennzeichnet, dass der Spannbacken (20) mit einer Feineinstellschraube (22) bestückt ist.Clamping element according to claims 1 u. 2, characterized in that the clamping jaw (20) is equipped with a fine adjustment screw (22). Spannelement nach den Ansprüchen 1 u. 2, dadurch gekennzeichnet, dass senkrecht zum Spanneinsatz (2) ein Klemmkolben (24) im Gehäuse (1) in einer Zylinderbohrung geführt ist, dass der Klemmkolben (24) im beaufschlagtem Zustand gegen den Spanneinsatz fährt und diesen mit seinen Führungsflächen (4) in die Schrägen (5) des Gehäuses drückt und festklemmt.Clamping element according to claims 1 u. 2, characterized in that perpendicular to the clamping insert (2) a clamping piston (24) in the housing (1) is guided in a cylinder bore, that the clamping piston (24) moves in the beaufschlagtem state against the clamping insert and this with its guide surfaces (4) in the bevels (5) of the housing presses and clamps. Spannelement nach den Ansprüchen 1 bis 4, dadurch gekennzeichnet, dass die Zuleitungen der Hydraulik zu den Anschlüssen (15;16) im Spanneinsatz flexibel sind. Clamping element according to claims 1 to 4, characterized in that the supply lines of the hydraulic system to the connections (15; 16) in the clamping insert are flexible. Spannelement nach Anspruch 1, dadurch gekennzeichnet, dass in dem Spanneinsatz (2; 30) eine Feder (28) eingesetzt ist, die sich am Boden des Gehäuses (1; 29) abstützt, durch deren Federkraft das Gewicht des Spanneinsatzes ausgeglichen ist.Clamping element according to claim 1, characterized in that in the clamping insert (2; 30) a spring (28) is inserted, which is supported on the bottom of the housing (1; 29), by whose spring force the weight of the clamping insert is balanced. Spannelement nach Anspruch 1, dadurch gekennzeichnet, dass der Spanneinsatz (30) zylindrisch ausgeführt und in einem Gehäuse (29) gleitend geführt ist, dass im Spanneinsatz (30) ein Kolben (3), mit einem Pleuel (8) und einem Spannhebel (11) am Kopf versehen, gelagert ist und dass senkrecht zum Spanneinsatz (30) ein Klemmkolben (32) angeordnet ist, dessen Druckfläche prismatisch ausgebildet dem Querschnitt des Spanneinsatzes angepasst ist und der im beaufschlagtem Zustand den Spanneinsatz (30) in die Wandung der Zylinderbohrung im Gehäuse (29) drückt.Clamping element according to claim 1, characterized in that the clamping insert (30) is cylindrical and slidably guided in a housing (29), that in the clamping insert (30) a piston (3), with a connecting rod (8) and a clamping lever (11 ) is provided on the head, is mounted and that perpendicular to the clamping insert (30) a clamping piston (32) is arranged, whose pressure surface is formed prismatic adapted to the cross section of the clamping insert and the beaufschlagtem state the clamping insert (30) in the wall of the cylinder bore in the housing (29) presses. Spannelement nach den Ansprüchen 1 u. 6, dadurch gekennzeichnet, dass im Gehäuse (29) unterhalb des geführten Spanneinsatzes (30) Rohrfedern (34; 35) angeordnet sind, die eine flexible Verbindung für die Hydraulik zwischen den äußeren Anschlüssen am Gehäuse und den Druckkammern (13 u. 14) im Zylinderraum des Spanneinsatzes für die Betätigung des Kolben (3) herstellen.Clamping element according to claims 1 u. 6, characterized in that in the housing (29) below the guided clamping insert (30) tube springs (34; 35) are arranged, which has a flexible connection for the hydraulics between the outer terminals on the housing and the pressure chambers (13 and 14) in Make the cylinder space of the clamping insert for actuating the piston (3). Spannelement nach Anspruch 7, dadurch gekennzeichnet, dass die Rohrfedern mittels Nippel und Laschen an den Enden mit den zugehörigen Anschlüssen und Kanälen verbunden sind.Clamping element according to claim 7, characterized in that the tube springs are connected by means of nipples and tabs at the ends with the associated terminals and channels.
EP02102026A 2001-07-19 2002-07-11 Clamping element for positionflexible clamping a workpiece Expired - Lifetime EP1277541B8 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10135280A DE10135280A1 (en) 2001-07-19 2001-07-19 Clamping element for flexible clamping of workpieces
DE10135280 2001-07-19

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EP1277541A1 true EP1277541A1 (en) 2003-01-22
EP1277541B1 EP1277541B1 (en) 2003-11-12
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EP (1) EP1277541B8 (en)
AT (1) ATE254008T1 (en)
DE (2) DE10135280A1 (en)

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Also Published As

Publication number Publication date
US6719281B2 (en) 2004-04-13
DE50200104D1 (en) 2003-12-18
EP1277541B8 (en) 2004-11-10
DE10135280A1 (en) 2003-02-06
EP1277541B1 (en) 2003-11-12
ATE254008T1 (en) 2003-11-15
US20030015832A1 (en) 2003-01-23

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