EP2161101A2 - Device for tensioning a workpiece for processing in a grinding machine - Google Patents

Device for tensioning a workpiece for processing in a grinding machine Download PDF

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Publication number
EP2161101A2
EP2161101A2 EP09011372A EP09011372A EP2161101A2 EP 2161101 A2 EP2161101 A2 EP 2161101A2 EP 09011372 A EP09011372 A EP 09011372A EP 09011372 A EP09011372 A EP 09011372A EP 2161101 A2 EP2161101 A2 EP 2161101A2
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EP
European Patent Office
Prior art keywords
clamping
ram
axis
counter
force
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
EP09011372A
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German (de)
French (fr)
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EP2161101B1 (en
EP2161101A3 (en
Inventor
Hans-Dieter Braun
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.)
Haas Schleifmaschinen GmbH
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Haas Schleifmaschinen GmbH
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Publication of EP2161101A2 publication Critical patent/EP2161101A2/en
Publication of EP2161101A3 publication Critical patent/EP2161101A3/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B41/00—Component parts such as frames, beds, carriages, headstocks
    • B24B41/06—Work supports, e.g. adjustable steadies
    • B24B41/061—Work supports, e.g. adjustable steadies axially supporting turning workpieces, e.g. magnetically, pneumatically
    • B24B41/062—Work supports, e.g. adjustable steadies axially supporting turning workpieces, e.g. magnetically, pneumatically between centres; Dogs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B3/00—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools
    • B24B3/34—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of turning or planing tools or tool bits, e.g. gear cutters
    • B24B3/343—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of turning or planing tools or tool bits, e.g. gear cutters of throw-away cutting bits

Definitions

  • the invention relates to a device for clamping a workpiece for machining in a grinding machine according to the preamble of patent claim 1.
  • the plan sides of the cutting insert are first ground in a first step. Subsequently, the periphery is ground to give the insert its shape, and finally the contour, that is, the cutting edge profile of the inserts is ground.
  • the cutting plates are clamped between two aligned in a clamping axis ram, which are acted upon on the one hand with an axial clamping force against each other to clamp the workpiece between the plungers, and on the other hand have a controlled rotary drive to the workpiece in the circumferential direction in Reference to the grinding wheel position.
  • Such a clamping device is for example from the EP 1 579 954 A1 known.
  • This known device has a holding element, in which the one ram as counter-ram freely rotatable, but is mounted axially immovable.
  • the holding element is guided axially freely displaceable on the serving as a clamping ram second plunger.
  • the clamping ram can be used for rotary positioning be driven rotationally.
  • On the holding element engages a lever which moves the holding element on the clamping plunger to initiate the axial clamping force in the fixed to the holding element counter-plunger.
  • the holding element is C-shaped, wherein the one leg receives the counter-ram, while the other leg leads the clamping ram.
  • the alignment of the two plungers in the clamping axis is thus determined by the dimensional stability of the C-shaped support member. Deformations of the holding element, for example due to thermal influences, can thus influence the exact alignment of the plungers and thus the accuracy of the grinding process.
  • the invention has for its object to provide a clamping device for workpieces during processing in a grinding machine, which ensures high precision in the tension and alignment of the workpiece.
  • the counter-plunger which is axially immovable and supports the axial clamping force is received in a base body.
  • a guide block is guided linearly displaceable parallel to the clamping axis.
  • This guide block accommodates the clamping ram, which is freely rotatably and axially displaceably mounted in this guide block.
  • An actuating device transmits the clamping force to the clamping ram, wherein this clamping force is introduced into the clamping ram so that only one axial Force is transmitted, but not perpendicular to this axial force radial force component.
  • the clamping ram is aligned in this way with high precision axially aligned with the counter-ram.
  • the axial alignment is ensured by the linear guidance of the guide block on the base body, so that no deformations or transverse forces can occur in the clamping device, which affect this axial alignment.
  • a servo motor which causes the controlled rotary drive of the counter-ram, received in the main body of the device.
  • the clamping device may be formed as a complete unit that can be used in a conventional grinding machine otherwise.
  • the workpiece can then rotate on the one hand to the clamping axis to grind the circumference of the workpiece.
  • the clamping axis can be pivoted about the rotational axis of the grinding machine, so that the workpiece is pivoted relative to the grinding tool to grind the contour. Both grinding operations can be done in the same tension of the workpiece, which increases the precision of machining and saves time.
  • the introduction of the clamping force in the device can be carried out in an advantageous manner via an actuating rod, which is axially displaceable.
  • the actuating rod In the direction of the clamping movement, the actuating rod is preferably acted upon axially by a spring force.
  • the tension rod is moved against this spring force, for example by a pneumatic unit.
  • FIG. 1 schematically shows the basic structure of a grinding machine, which can be equipped with the inventive device for clamping a workpiece, in particular a cutting insert or indexable insert.
  • the grinding machine has a machine bed 10 with a vertical rear wall 12.
  • a table 14 is arranged, which is movable in a horizontal Y-axis perpendicular to the front operator side and the rear wall 12 controlled.
  • a cross slide is arranged, which is controlled in a direction perpendicular to the Y-axis horizontal X-axis and in a direction perpendicular to the X-axis and the Y-axis vertical Z-axis movable.
  • a grinding spindle unit 18 which is rotatably supported in the carriage 16 about a C-axis parallel to the Z-axis and rotationally driven about this C-axis.
  • a grinding spindle is horizontally mounted, which is driven by a spindle motor 20 and carries at its free end a grinding tool 22, which is in particular designed as a cup-shaped grinding wheel.
  • a workpiece spindle unit 24 is arranged, which receives a workpiece spindle 26.
  • the workpiece spindle 26 is rotatable by means of a motor 28 numerically controlled about its axis parallel to the X-axis A-axis.
  • the grinding machine corresponds to the state of the art.
  • FIG. 4 As in the Figures 2 and 3 can be seen, on the workpiece spindle 26, a clamping device mounted as in FIG. 4 is shown.
  • the tensioning device has a main body 30.
  • coupling means are mounted, with which the base body 30 can be fixedly connected to the workpiece spindle 26.
  • the coupling agent consist in the illustrated Embodiment of a shaft taper 32 which is inserted into the receiving flange of the workpiece spindle 26 and screwed thereto.
  • the main body 30 is thus controlled via the workpiece spindle 26 pivotable about the A-axis.
  • a servo motor 34 is firmly received.
  • a counter-ram 38 is mounted, which is coaxially aligned with the motor shaft of the servomotor 34.
  • the counter-ram 38 can be numerically controlled by means of the servomotor 34 about its central axis, which is referred to as the clamping axis, are rotated.
  • the servo motor 34 and the counter-ram 38 are arranged in the base body 30 so that the axis of the counter-ram 38, ie the clamping axis orthogonally intersects the central axis of the shaft cone 32 and thus the A-axis. Accordingly, the clamping axis can also be referred to as B-axis, as in FIG. 2 is indicated.
  • a guide block 40 is mounted in the base body 30 below the clamping axis and spaced therefrom.
  • the guide block 40 is guided linearly displaceable in the main body 30 in a direction parallel to the clamping axis direction.
  • the base body 30 for example, a recess in which the guide block 40 is arranged and slides on guides 42 which extend parallel to the clamping axis and are mounted in the base body 30.
  • the guides 42 are formed in the illustrated embodiment as guide rods.
  • the guide block 40 can move freely on the guides 42 with a stroke of, for example, about 10 millimeters.
  • a guide bush 44 is attached on the guide block 40.
  • the guide bush 44 is axially aligned with the central axis the counter-ram 38 aligned.
  • a clamping ram 46 is guided free of play both axially and rotationally freely movable.
  • the clamping ram 46 is preferably formed conically at its end facing the counter-ram 38 end.
  • a workpiece, in particular an indexable insert 48 can be tensioned between the counter-ram 38 and the clamping ram 46 by the indexable insert 48 is arranged centrally to the clamping axis and the clamping ram 46 is moved by force against the counter-ram 38.
  • the clamping ram 46 can penetrate into a clamping recess or clamping bore of the indexable insert 48 in order to clamp it centered on the counter-ram 38.
  • an actuating rod 50 is arranged, which leads coaxially through the shaft cone 32 and with an in FIG. 5 52 designated stroke is axially displaceable.
  • the actuating rod 50 is biased with a spring force which pushes the actuating rod 50 out of the shaft taper 32.
  • this preload is generated by a package of cup springs 54 which are supported at one end on the stem cone 32 and the other end to an outer collar of the actuating rod 50.
  • the coaxially through the shaft cone 32 in the workpiece spindle 26 leading end of the actuating rod 50 is further connected to a non-visible in the drawing pneumatic unit through which the actuating rod 50 against the spring force of the plate springs 54 can be pushed inwardly into the base body 30.
  • the inner end of the actuating rod 50 is pivotally connected via tabs 56 with an arm of a pivot lever 58 which is pivotally mounted about a pivot point 60 in the base body.
  • the pivot lever 58 has two approximately perpendicular arms, one of which is hinged to the actuating rod 50 and substantially perpendicular to this runs.
  • a ball 62 mounted, with which the pivot lever 58 rests against the end face of the clamping ram 46 facing away from the counter-ram 38.
  • the free arm of the pivot lever 58 is freely pivotable between the guide block 40 with the guide bushing 44 and a stop 64 which limits the pivotal movement of the free arm of the pivot lever 58 of the guide block 40 and the guide bushing 44 away.
  • this stop 64 is formed by the head of a screw which is screwed into the guide block 40 and whose shaft passes through a slot in the arm of the pivot lever 58.
  • the pivoting of the pivot lever 58 is thus limited to the length of the screw shank of the stop 64.
  • a locking ring 66 is still placed on the clamping ram 46 at its rear end, which protrudes from the guide bush 44 against the ball 62.
  • the clamping device works in the following way:
  • the actuating rod 50 is pressed by means of the pneumatic unit against the force of the disc springs 54 in the main body 30.
  • the actuating rod 50 thereby pivots the pivot lever 58 in the representation of FIG. 5 in the counterclockwise direction.
  • the free arm of the pivot lever 58 thereby moves on the shaft of the screw of the stop 64 until the pivot lever 58 abuts against the stop 64 of the screw head.
  • this takes over the stop 64 with the guide block 40 with.
  • the guide block 40 takes with its guide bush 44 while the clamping ram 46, since the guide bushing 44 on the locking ring 66 of the clamping ram 46th comes to the plant.
  • the clamping ram 46 is thus pulled away axially from the counter-ram 38, so that the tensioned and finished, ground indexable insert 48 is released.
  • the indexable insert 48 can be detected, for example, by a handling gripper 68, which is moved by means of the cross slide 16.
  • the handling gripper 68 places the ground indexable insert 48, for example in a cassette 70, removes the cassette 70 from an unpolished indexable insert 48 and brings it into the clamping position between the counter-ram 38 and the clamping ram 46.
  • the workpiece namely the indexable insert 48
  • the grinding wheel 22 can now be ground by means of the grinding wheel 22.
  • the cross slide 16 the grinding wheel 22 is delivered in the X-axis and the Z-axis, while a feed movement in the Y-axis via the table 14 can take place.
  • the clamping device is pivoted about the A-axis so that the clamping axis defined by the counter-ram 38 and the clamping ram 46 is horizontal, i. parallel to the Y-axis.
  • the circumference can now be ground by the counter-ram 38 is rotated by means of the servo motor 34 about the clamping axis.
  • the workpiece, the indexable insert 48 is frictionally rotated and also the clamping rod 46 rotates freely in the guide bushing 44.
  • the cutting contour of the insert 48 can be ground in the same voltage, for which purpose the clamping device is pivoted about the A-axis by means of the motor 28 , As a result, the angle of attack of the clamping axis is pivoted against the axis of the grinding wheel 22 to produce, for example, chamfers of the cutting edge, free cutting surfaces on the circumference and any troughs in the plate planes.
  • the counter-ram 38 is shaped so that its diameter decreases conically from the end flanged to the shaft flange of the servomotor 34 against the end abutting the workpiece 48.
  • the plungers 38 and 46 on both sides of the tensioned indexable insert 48 has a small diameter, so that sufficient space is available to even with a cup-shaped Grinding wheel 22 on both sides of the insert 48 to attack.
  • the finished workpiece 48 is released again by acting on the actuating rod 50 by means of the pneumatic unit, so that the cycle described can start again.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)

Abstract

The device comprises a base body (30), which is mounted at a workpiece spindle of the grinding machine. A tension axle cuts the rotation axis of the workpiece spindle orthogonally. A clamping ram (46) is guided in a guiding block (40) in freely rotating manner. An actuator transfers clamping force to the clamping ram with transmission units, which allow an axial but not radial force transmission.

Description

Die Erfindung betrifft eine Vorrichtung zum Spannen eines Werkstücks für die Bearbeitung in einer Schleifmaschine gemäß dem Oberbegriff des Patentanspruchs 1.The invention relates to a device for clamping a workpiece for machining in a grinding machine according to the preamble of patent claim 1.

Bei der Schleifbearbeitung von scheibenförmigen Werkstücken ist es häufig notwendig, den Umfang des Werkstückes und dessen Kontur zu schleifen. Beispielsweise werden bei Schneidplatten und insbesondere Wendeschneidplatten für spanabhebende Werkzeugmaschinen zunächst in einem ersten Schritt die Planseiten der Schneidplatte geschliffen. Anschließend wird der Umfang geschliffen, um der Schneidplatte ihre Form zu geben, und schließlich wird die Kontur, das heißt das Schneidkantenprofil der Schneidplatten geschliffen. Für die beiden letztgenannten Schleifbearbeitungen werden die Schneidplatten zwischen zwei in einer Spannachse fluchtenden Stößeln gespannt, die einerseits mit einer axialen Spannkraft gegeneinander beaufschlagt werden, um das Werkstück zwischen den Stößeln zu spannen, und die andererseits einen gesteuerten Drehantrieb aufweisen, um das Werkstück in Umfangsrichtung in Bezug auf die Schleifscheibe zu positionieren.In the grinding of disc-shaped workpieces, it is often necessary to grind the circumference of the workpiece and its contour. For example, in cutting inserts and in particular indexable inserts for cutting machine tools, the plan sides of the cutting insert are first ground in a first step. Subsequently, the periphery is ground to give the insert its shape, and finally the contour, that is, the cutting edge profile of the inserts is ground. For the two latter grinding operations, the cutting plates are clamped between two aligned in a clamping axis ram, which are acted upon on the one hand with an axial clamping force against each other to clamp the workpiece between the plungers, and on the other hand have a controlled rotary drive to the workpiece in the circumferential direction in Reference to the grinding wheel position.

Eine solche Spannvorrichtung ist z.B. aus der EP 1 579 954 A1 bekannt. Diese bekannte Vorrichtung weist ein Halteelement auf, in welchem der eine Stößel als Gegenstößel frei drehbar, aber axial unverschiebbar gelagert ist. Das Halteelement ist axial frei verschiebbar auf dem als Spannstößel dienenden zweiten Stößel geführt. Der Spannstößel kann zur Drehpositionierung rotatorisch angetrieben werden. An dem Halteelement greift ein Hebel an, der das Halteelement auf dem Spannstößel verschiebt, um die axiale Spannkraft in den an dem Halteelement festgelegten Gegenstößel einzuleiten. Das Halteelement ist C-förmig ausgebildet, wobei der eine Schenkel den Gegenstößel aufnimmt, während der andere Schenkel den Spannstößel führt. Die fluchtende Ausrichtung der zwei Stößel in der Spannachse ist somit durch die Formstabilität des C-förmigen Halteelements bestimmt. Verformungen des Halteelements, z.B. durch thermische Einflüsse, können somit die exakte Fluchtung der Stößel und damit die Genauigkeit der Schleifbearbeitung beeinflussen.Such a clamping device is for example from the EP 1 579 954 A1 known. This known device has a holding element, in which the one ram as counter-ram freely rotatable, but is mounted axially immovable. The holding element is guided axially freely displaceable on the serving as a clamping ram second plunger. The clamping ram can be used for rotary positioning be driven rotationally. On the holding element engages a lever which moves the holding element on the clamping plunger to initiate the axial clamping force in the fixed to the holding element counter-plunger. The holding element is C-shaped, wherein the one leg receives the counter-ram, while the other leg leads the clamping ram. The alignment of the two plungers in the clamping axis is thus determined by the dimensional stability of the C-shaped support member. Deformations of the holding element, for example due to thermal influences, can thus influence the exact alignment of the plungers and thus the accuracy of the grinding process.

Der Erfindung liegt die Aufgabe zugrunde, eine Spannvorrichtung für Werkstücke bei der Bearbeitung in einer Schleifmaschine zur Verfügung zu stellen, die eine hohe Präzision in der Spannung und Ausrichtung des Werkstückes gewährleistet.The invention has for its object to provide a clamping device for workpieces during processing in a grinding machine, which ensures high precision in the tension and alignment of the workpiece.

Diese Aufgabe wird erfindungsgemäß gelöst durch eine Vorrichtung mit den Merkmalen des Patentanspruchs 1.This object is achieved by a device with the features of claim 1.

Vorteilhafte Ausführungen der Erfindung sind in den Unteransprüchen angegeben.Advantageous embodiments of the invention are specified in the subclaims.

Bei der erfindungsgemäßen Spannvorrichtung ist der Gegenstößel, der axial unverschiebbar ist und die axiale Spannkraft abstützt in einem Grundkörper aufgenommen. In diesem Grundkörper ist ein Führungsblock parallel zur Spannachse linear verschiebbar geführt. Dieser Führungsblock nimmt den Spannstößel auf, der in diesem Führungsblock frei drehbar und axial verschiebbar gelagert ist. Eine Betätigungseinrichtung überträgt die Spannkraft auf den Spannstößel, wobei diese Spannkraft so in den Spannstößel eingeleitet wird, dass nur eine axiale Kraft übertragen wird, jedoch keine zu dieser axialen Kraft senkrechte radiale Kraftkomponente. Der Spannstößel ist auf diese Weise mit hoher Präzision axial fluchtend mit dem Gegenstößel ausgerichtet. Die axiale Fluchtung wird durch die lineare Führung des Führungsblockes an dem Grundkörper gewährleistet, so dass keine Verformungen oder Querkräfte in der Spannvorrichtung auftreten können, die diese axiale Fluchtung beeinträchtigen.In the clamping device according to the invention, the counter-plunger, which is axially immovable and supports the axial clamping force is received in a base body. In this body, a guide block is guided linearly displaceable parallel to the clamping axis. This guide block accommodates the clamping ram, which is freely rotatably and axially displaceably mounted in this guide block. An actuating device transmits the clamping force to the clamping ram, wherein this clamping force is introduced into the clamping ram so that only one axial Force is transmitted, but not perpendicular to this axial force radial force component. The clamping ram is aligned in this way with high precision axially aligned with the counter-ram. The axial alignment is ensured by the linear guidance of the guide block on the base body, so that no deformations or transverse forces can occur in the clamping device, which affect this axial alignment.

In einer vorteilhaften Ausführung ist ein Servomotor, der den gesteuerten Drehantrieb des Gegenstößels bewirkt, in dem Grundkörper der Vorrichtung aufgenommen. Damit kann die Spannvorrichtung als komplette Einheit ausgebildet sein, die in eine im Übrigen herkömmliche Schleifmaschine eingesetzt werden kann. Bei dieser Ausführung ist es insbesondere auch möglich, die Spannvorrichtung in eine rotatorische Werkstückachse einer Schleifmaschine so einzusetzen, dass die Spannachse der Vorrichtung diese rotatorische Achse senkrecht schneidet. Das Werkstück kann dann zum einen um die Spannachse rotieren, um den Umfang des Werkstückes zu schleifen. Zum anderen kann die Spannachse um die rotatorische Achse der Schleifmaschine verschwenkt werden, so dass das Werkstück gegenüber dem Schleifwerkzeug verschwenkt wird, um die Kontur zu schleifen. Beide Schleifbearbeitungen können in derselben Spannung des Werkstückes erfolgen, was die Präzision der Bearbeitung erhöht und eine Zeiteinsparung bedeutet.In an advantageous embodiment, a servo motor, which causes the controlled rotary drive of the counter-ram, received in the main body of the device. Thus, the clamping device may be formed as a complete unit that can be used in a conventional grinding machine otherwise. In this embodiment, it is particularly possible to use the clamping device in a rotary workpiece axis of a grinding machine so that the clamping axis of the device intersects this rotary axis perpendicular. The workpiece can then rotate on the one hand to the clamping axis to grind the circumference of the workpiece. On the other hand, the clamping axis can be pivoted about the rotational axis of the grinding machine, so that the workpiece is pivoted relative to the grinding tool to grind the contour. Both grinding operations can be done in the same tension of the workpiece, which increases the precision of machining and saves time.

Die Einleitung der Spannkraft in die Vorrichtung kann in vorteilhafter Weise über eine Betätigungsstange erfolgen, die axial verschiebbar ist. In der Richtung der Spannbewegung wird die Betätigungsstange vorzugsweise axial durch eine Federkraft beaufschlagt. Zum Öffnen der Spannvorrichtung für einen Wechsel des Werkstückes wird die Spannstange gegen diese Federkraft bewegt, z.B. durch ein pneumatisches Aggregat.The introduction of the clamping force in the device can be carried out in an advantageous manner via an actuating rod, which is axially displaceable. In the direction of the clamping movement, the actuating rod is preferably acted upon axially by a spring force. To open the clamping device for a change of the workpiece, the tension rod is moved against this spring force, for example by a pneumatic unit.

Im Folgenden wird die Erfindung anhand eines in der Zeichnung dargestellten Ausführungsbeispiels näher erläutert. Es zeigen

Figur 1
schematisch den Grundaufbau einer Schleifmaschine,
Figur 2
in perspektivischer Ansicht die für die erfindungsgemäße Ausgestaltung wesentlichen Teile der Schleifmaschine,
Figur 3
eine Figur 2 entsprechende Darstellung in einer anderen Arbeitsposition,
Figur 4
in perspektivischer Ansicht die Spannvorrichtung,
Figur 5
die Spannvorrichtung in der in Figur 4 gezeigten Ansicht, jedoch teilweise geschnitten,
Figur 6
eine Teilansicht der Spannvorrichtung im geöffneten Zustand,
Figur 7
eine Figur 6 entsprechende Darstellung in geschlossenem Zustand und
Figur 8
eine Teildarstellung der Spannvorrichtung in geöffnetem Zustand der Figur 6.
In the following the invention will be explained in more detail with reference to an embodiment shown in the drawing. Show it
FIG. 1
schematically the basic structure of a grinding machine,
FIG. 2
3 is a perspective view of the essential parts of the grinding machine according to the invention;
FIG. 3
a FIG. 2 corresponding representation in another working position,
FIG. 4
in perspective view the tensioning device,
FIG. 5
the tensioning device in the in FIG. 4 shown view, but partially cut,
FIG. 6
a partial view of the clamping device in the open state,
FIG. 7
a FIG. 6 corresponding representation in the closed state and
FIG. 8
a partial view of the clamping device in the open state of FIG. 6 ,

In Figur 1 ist schematisch der Grundaufbau einer Schleifmaschine gezeigt, die mit der erfindungsgemäßen Vorrichtung zum Spannen eines Werkstücks, insbesondere einer Schneidplatte oder Wendeschneidplatte ausgestattet werden kann. Die Schleifmaschine weist ein Maschinenbett 10 mit einer vertikalen Rückwand 12 auf. Auf dem Maschinenbett 10 ist ein Tisch 14 angeordnet, der in einer horizontalen Y-Achse senkrecht zur vorderen Bedienerseite und zur Rückwand 12 gesteuert verfahrbar ist. An der Rückwand 12 ist ein Kreuzschlitten angeordnet, der in einer zur Y-Achse senkrechten horizontalen X-Achse und in einer zu der X-Achse und der Y-Achse senkrechten vertikalen Z-Achse gesteuert verfahrbar ist. Unten an dem Schlitten 16 ist eine Schleifspindeleinheit 18 angeordnet, die um eine zur Z-Achse parallele C-Achse drehbar in dem Schlitten 16 gelagert ist und um diese C-Achse gesteuert drehangetrieben ist. In der Schleifspindeleinheit 18 ist horizontal eine Schleifspindel gelagert, die durch einen Spindelmotor 20 angetrieben wird und an ihrem freien Ende ein Schleifwerkzeug 22 trägt, das insbesondere als topfförmige Schleifscheibe ausgebildet ist. Auf dem Tisch 14 ist eine Werkstückspindeleinheit 24 angeordnet, die eine Werkstückspindel 26 aufnimmt. Die Werkstückspindel 26 ist mittels eines Motors 28 numerisch gesteuert um ihre zur X-Achse parallele A-Achse drehbar. Insoweit entspricht die Schleifmaschine dem Stand der Technik.In FIG. 1 schematically shows the basic structure of a grinding machine, which can be equipped with the inventive device for clamping a workpiece, in particular a cutting insert or indexable insert. The grinding machine has a machine bed 10 with a vertical rear wall 12. On the machine bed 10, a table 14 is arranged, which is movable in a horizontal Y-axis perpendicular to the front operator side and the rear wall 12 controlled. On the rear wall 12, a cross slide is arranged, which is controlled in a direction perpendicular to the Y-axis horizontal X-axis and in a direction perpendicular to the X-axis and the Y-axis vertical Z-axis movable. At the bottom of the carriage 16, there is disposed a grinding spindle unit 18, which is rotatably supported in the carriage 16 about a C-axis parallel to the Z-axis and rotationally driven about this C-axis. In the grinding spindle unit 18, a grinding spindle is horizontally mounted, which is driven by a spindle motor 20 and carries at its free end a grinding tool 22, which is in particular designed as a cup-shaped grinding wheel. On the table 14, a workpiece spindle unit 24 is arranged, which receives a workpiece spindle 26. The workpiece spindle 26 is rotatable by means of a motor 28 numerically controlled about its axis parallel to the X-axis A-axis. In that regard, the grinding machine corresponds to the state of the art.

Wie in den Figuren 2 und 3 zu sehen ist, ist an der Werkstückspindel 26 eine Spannvorrichtung montiert, wie sie in Figur 4 gezeigt ist.As in the Figures 2 and 3 can be seen, on the workpiece spindle 26, a clamping device mounted as in FIG. 4 is shown.

Die Spannvorrichtung weist einen Grundkörper 30 auf. An dem Grundkörper 30 sind Kupplungsmittel angebracht, mit welchen der Grundkörper 30 fest mit der Werkstückspindel 26 verbunden werden kann. Die Kupplungsmittel bestehen im dargestellten Ausführungsbeispiel aus einem Schaftkegel 32, der in den Aufnahmeflansch der Werkstückspindel 26 eingesetzt und mit diesem verschraubt wird. Der Grundkörper 30 ist somit über die Werkstückspindel 26 gesteuert um die A-Achse schwenkbar.The tensioning device has a main body 30. On the main body 30 coupling means are mounted, with which the base body 30 can be fixedly connected to the workpiece spindle 26. The coupling agent consist in the illustrated Embodiment of a shaft taper 32 which is inserted into the receiving flange of the workpiece spindle 26 and screwed thereto. The main body 30 is thus controlled via the workpiece spindle 26 pivotable about the A-axis.

In dem Grundkörper 30 ist ein Servomotor 34 fest aufgenommen. An einem Flansch 36 der Motorwelle des Servomotors 34 ist ein Gegenstößel 38 montiert, der koaxial mit der Motorwelle des Servomotors 34 fluchtet. Der Gegenstößel 38 kann mittels des Servomotors 34 numerisch gesteuert um seine Mittelachse, die als Spannachse bezeichnet wird, gedreht werden. Der Servomotor 34 und der Gegenstößel 38 sind in dem Grundkörper 30 so angeordnet, dass die Achse des Gegenstößels 38, d.h. die Spannachse die Mittelachse des Schaftkegels 32 und damit die A-Achse orthogonal schneidet. Dementsprechend kann die Spannachse auch als B-Achse bezeichnet werden, wie dies in Figur 2 angedeutet ist.In the main body 30, a servo motor 34 is firmly received. On a flange 36 of the motor shaft of the servo motor 34, a counter-ram 38 is mounted, which is coaxially aligned with the motor shaft of the servomotor 34. The counter-ram 38 can be numerically controlled by means of the servomotor 34 about its central axis, which is referred to as the clamping axis, are rotated. The servo motor 34 and the counter-ram 38 are arranged in the base body 30 so that the axis of the counter-ram 38, ie the clamping axis orthogonally intersects the central axis of the shaft cone 32 and thus the A-axis. Accordingly, the clamping axis can also be referred to as B-axis, as in FIG. 2 is indicated.

Unterhalb der Spannachse und von dieser beabstandet ist in dem Grundkörper 30 ein Führungsblock 40 gelagert. Der Führungsblock 40 ist in einer zur Spannachse parallelen Richtung linear verschiebbar in dem Grundkörper 30 geführt. Hierzu weist der Grundkörper 30 beispielsweise eine Aussparung auf, in welcher der Führungsblock 40 angeordnet ist und auf Führungen 42 gleitet, die parallel zur Spannachse verlaufen und in dem Grundkörper 30 angebracht sind. Die Führungen 42 sind in dem dargestellten Ausführungsbeispiel als Führungsstangen ausgebildet. Der Führungsblock 40 kann sich auf den Führungen 42 frei bewegen mit einem Hub von beispielsweise etwa 10 Millimetern.Below the clamping axis and spaced therefrom, a guide block 40 is mounted in the base body 30. The guide block 40 is guided linearly displaceable in the main body 30 in a direction parallel to the clamping axis direction. For this purpose, the base body 30, for example, a recess in which the guide block 40 is arranged and slides on guides 42 which extend parallel to the clamping axis and are mounted in the base body 30. The guides 42 are formed in the illustrated embodiment as guide rods. The guide block 40 can move freely on the guides 42 with a stroke of, for example, about 10 millimeters.

Auf dem Führungsblock 40 ist eine Führungsbuchse 44 befestigt. Die Führungsbuchse 44 ist axial fluchtend mit der Mittelachse des Gegenstößels 38 ausgerichtet. In der Führungsbuchse 44 ist ein Spannstößel 46 spielfrei sowohl axial als auch rotatorisch frei beweglich geführt. Der Spannstößel 46 ist an seinem dem Gegenstößel 38 zugewandten Ende vorzugsweise konisch ausgebildet. Ein Werkstück, insbesondere eine Wendeschneidplatte 48, kann zwischen dem Gegenstößel 38 und dem Spannstößel 46 gespannt werden, indem die Wendeschneidplatte 48 mittig zur Spannachse angeordnet wird und der Spannstößel 46 gegen den Gegenstößel 38 kraftbeaufschlagt bewegt wird. Der Spannstößel 46 kann dabei in eine Spannmulde oder Spannbohrung der Wendeschneidplatte 48 eindringen, um diese zentriert an dem Gegenstößel 38 zu spannen.On the guide block 40, a guide bush 44 is attached. The guide bush 44 is axially aligned with the central axis the counter-ram 38 aligned. In the guide bushing 44, a clamping ram 46 is guided free of play both axially and rotationally freely movable. The clamping ram 46 is preferably formed conically at its end facing the counter-ram 38 end. A workpiece, in particular an indexable insert 48, can be tensioned between the counter-ram 38 and the clamping ram 46 by the indexable insert 48 is arranged centrally to the clamping axis and the clamping ram 46 is moved by force against the counter-ram 38. The clamping ram 46 can penetrate into a clamping recess or clamping bore of the indexable insert 48 in order to clamp it centered on the counter-ram 38.

In dem Grundkörper 30 ist eine Betätigungsstange 50 angeordnet, die koaxial durch den Schaftkegel 32 führt und mit einem in Figur 5 mit 52 bezeichneten Hub axial verschiebbar ist. Die Betätigungsstange 50 ist mit einer Federkraft vorgespannt, die die Betätigungsstange 50 aus dem Schaftkegel 32 herausdrückt. Im dargestellten Ausführungsbeispiel wird diese Federvorspannung durch ein Paket von Tellerfedern 54 erzeugt, die sich an einem Ende an dem Schaftkegel 32 und dem anderen Ende an einem Außenbund der Betätigungsstange 50 abstützen. Das koaxial durch den Schaftkegel 32 in die Werkstückspindel 26 führende Ende der Betätigungsstange 50 ist weiter mit einem in der Zeichnung nicht sichtbaren pneumatischen Aggregat verbunden, durch welches die Betätigungsstange 50 gegen die Federkraft der Tellerfedern 54 nach innen in den Grundkörper 30 geschoben werden kann. Das innere Ende der Betätigungsstange 50 ist über Laschen 56 gelenkig mit einem Arm eines Schwenkhebels 58 verbunden, der um einen Schwenkpunkt 60 schwenkbar in dem Grundkörper gelagert ist. Der Schwenkhebel 58 weist zwei etwa rechtwinklig zueinander stehende Arme auf, von denen der eine an der Betätigungsstange 50 angelenkt ist und im Wesentlichen rechtwinklig zu dieser verläuft. In dem freien Ende des anderen Armes des Schwenkhebels 58 ist frei drehbar aber axial abgestützt eine Kugel 62 gelagert, mit welcher der Schwenkhebel 58 an der von dem Gegenstößel 38 abgewandten Endstirnfläche des Spannstößels 46 anliegt. Der freie Arm des Schwenkhebels 58 ist frei verschwenkbar zwischen dem Führungsblock 40 mit der Führungsbuchse 44 und einem Anschlag 64, der die Schwenkbewegung des freien Armes des Schwenkhebels 58 von dem Führungsblock 40 und der Führungsbuchse 44 weg begrenzt. Im dargestellten Ausführungsbeispiel ist dieser Anschlag 64 durch den Kopf einer Schraube gebildet, die in den Führungsblock 40 eingedreht ist und deren Schaft ein Langloch in dem Arm des Schwenkhebels 58 durchsetzt. Der Schwenkweg des Schwenkhebels 58 ist somit auf die Länge des Schraubenschaftes des Anschlags 64 begrenzt. Schließlich ist noch ein Sicherungsring 66 auf den Spannstößel 46 an dessen hinterem Ende aufgesetzt, welches aus der Führungsbuchse 44 gegen die Kugel 62 vorragt.In the main body 30, an actuating rod 50 is arranged, which leads coaxially through the shaft cone 32 and with an in FIG. 5 52 designated stroke is axially displaceable. The actuating rod 50 is biased with a spring force which pushes the actuating rod 50 out of the shaft taper 32. In the illustrated embodiment, this preload is generated by a package of cup springs 54 which are supported at one end on the stem cone 32 and the other end to an outer collar of the actuating rod 50. The coaxially through the shaft cone 32 in the workpiece spindle 26 leading end of the actuating rod 50 is further connected to a non-visible in the drawing pneumatic unit through which the actuating rod 50 against the spring force of the plate springs 54 can be pushed inwardly into the base body 30. The inner end of the actuating rod 50 is pivotally connected via tabs 56 with an arm of a pivot lever 58 which is pivotally mounted about a pivot point 60 in the base body. The pivot lever 58 has two approximately perpendicular arms, one of which is hinged to the actuating rod 50 and substantially perpendicular to this runs. In the free end of the other arm of the pivot lever 58 is freely rotatable but axially supported a ball 62 mounted, with which the pivot lever 58 rests against the end face of the clamping ram 46 facing away from the counter-ram 38. The free arm of the pivot lever 58 is freely pivotable between the guide block 40 with the guide bushing 44 and a stop 64 which limits the pivotal movement of the free arm of the pivot lever 58 of the guide block 40 and the guide bushing 44 away. In the illustrated embodiment, this stop 64 is formed by the head of a screw which is screwed into the guide block 40 and whose shaft passes through a slot in the arm of the pivot lever 58. The pivoting of the pivot lever 58 is thus limited to the length of the screw shank of the stop 64. Finally, a locking ring 66 is still placed on the clamping ram 46 at its rear end, which protrudes from the guide bush 44 against the ball 62.

Die Spannvorrichtung arbeitet in folgender Weise:The clamping device works in the following way:

Zum Wechsel des zu schleifenden Werkstückes, z.B. einer Wendeschneidplatte 48, wird die Betätigungsstange 50 mittels des pneumatischen Aggregats gegen die Kraft der Tellerfedern 54 in den Grundkörper 30 hineingedrückt. Die Betätigungsstange 50 verschwenkt dadurch den Schwenkhebel 58 in der Darstellung der Figur 5 im Gegenuhrzeigersinn. Der freie Arm des Schwenkhebels 58 bewegt sich dabei auf dem Schaft der Schraube des Anschlags 64, bis der Schwenkhebel 58 an dem Anschlag 64 des Schraubenkopfes anschlägt. Bei der weiteren Schwenkbewegung des Schwenkhebels 58 nimmt dieser über den Anschlag 64 den Führungsblock 40 mit. Der Führungsblock 40 nimmt mit seiner Führungsbuchse 44 dabei auch den Spannstößel 46 mit, da die Führungsbuchse 44 an dem Sicherungsring 66 des Spannstößels 46 zur Anlage kommt. Der Spannstößel 46 wird somit von dem Gegenstößel 38 axial weggezogen, so dass die gespannte und fertig beschliffene Wendeschneidplatte 48 freikommt.To change the workpiece to be ground, for example an indexable insert 48, the actuating rod 50 is pressed by means of the pneumatic unit against the force of the disc springs 54 in the main body 30. The actuating rod 50 thereby pivots the pivot lever 58 in the representation of FIG. 5 in the counterclockwise direction. The free arm of the pivot lever 58 thereby moves on the shaft of the screw of the stop 64 until the pivot lever 58 abuts against the stop 64 of the screw head. In the further pivoting movement of the pivot lever 58, this takes over the stop 64 with the guide block 40 with. The guide block 40 takes with its guide bush 44 while the clamping ram 46, since the guide bushing 44 on the locking ring 66 of the clamping ram 46th comes to the plant. The clamping ram 46 is thus pulled away axially from the counter-ram 38, so that the tensioned and finished, ground indexable insert 48 is released.

Die Wendeschneidplatte 48 kann beispielsweise durch einen Handling-Greifer 68 erfasst werden, der mittels des Kreuzschlittens 16 verfahren wird. Der Handling-Greifer 68 legt die geschliffene Wendeschneidplatte 48 beispielsweise in einer Kassette 70 ab, entnimmt der Kassette 70 eine unbeschliffene Wendeschneidplatte 48 und bringt diese in die Spannstellung zwischen dem Gegenstößel 38 und dem Spannstößel 46.The indexable insert 48 can be detected, for example, by a handling gripper 68, which is moved by means of the cross slide 16. The handling gripper 68 places the ground indexable insert 48, for example in a cassette 70, removes the cassette 70 from an unpolished indexable insert 48 and brings it into the clamping position between the counter-ram 38 and the clamping ram 46.

Dann wird der Druck des pneumatischen Aggregats auf die Betätigungsstange 50 aufgehoben, so dass die Tellerfedern 54 aufgrund ihrer Vorspannung nun die Betätigungsstange 50 wieder in Richtung aus dem Grundkörper 30 heraus ziehen. Dadurch wird der an der Betätigungsstange 50 angelenkte Schwenkhebel 58 in Figur 5 im Uhrzeigersinn verschwenkt. Der freie Arm des Schwenkhebels 58 drückt nun mit seiner Kugel 62 den Spannstößel 46 gegen den Gegenstößel 38, wobei der Spannstößel 46 in die Spannmulde der Wendeschneidplatte 48 eingreift und die Wendeschneidplatte 48 unter der von den Tellerfedern 54 erzeugten Spannkraft gegen den Gegenstößel 38 spannt. Die Wendeschneidplatte 48 ist somit für das Schleifen mittels der Schleifscheibe 22 gespannt. Dabei wird über die drehbar gelagerte Kugel 62 ausschließlich eine axiale Druckkraft als Spannkraft auf den Spannstößel 46 ausgeübt. Eine Kraft quer zur Achse kann die Kugel 62 nicht auf den Spannstößel 46 übertragen. Der Führungsblock 40 ist in dieser Spannstellung frei auf den Führungen 42 verschiebbar, wobei auch die Führungsbuchse 44 sich frei auf dem Spannstößel bewegen kann. Es werden daher auch keine Kräfte von dem Führungsblock 40 auf den Spannstößel 46 übertragen, so dass auch eventuelle thermische Ausdehnungen des Grundkörpers 30 nicht auf den Spannstößel 46 übertragen werden können und die exakte fluchtende Ausrichtung von Gegenstößel 38 und Spannstößel 46 nicht beeinflussen können.Then, the pressure of the pneumatic unit on the actuating rod 50 is released, so that the plate springs 54 now pull the actuating rod 50 back out of the main body 30 due to their bias. As a result, the pivoted on the actuating rod 50 pivot lever 58 in FIG. 5 pivoted clockwise. The free arm of the pivot lever 58 now presses with its ball 62, the clamping ram 46 against the counter-ram 38, the clamping ram 46 engages in the clamping recess of the insert 48 and the indexable insert 48 clamped under the clamping force generated by the plate springs 54 against the counter-ram 38. The indexable insert 48 is thus tensioned for grinding by means of the grinding wheel 22. In this case, only an axial compressive force is exerted on the clamping ram 46 as a clamping force on the rotatably mounted ball 62. A force transverse to the axis, the ball 62 is not transmitted to the clamping ram 46. The guide block 40 is freely displaceable in this clamping position on the guides 42, wherein the guide bushing 44 can move freely on the clamping ram. There are therefore no forces transmitted from the guide block 40 on the clamping ram 46, so that any thermal Expansions of the main body 30 can not be transferred to the clamping ram 46 and the exact alignment of the counter-ram 38 and clamping ram 46 can not affect.

Das Werkstück, nämlich die Wendeschneidplatte 48, kann nun mittels der Schleifscheibe 22 geschliffen werden. Mittels des Kreuzschlittens 16 wird die Schleifscheibe 22 in der X-Achse und der Z-Achse zugestellt, während eine Zustellbewegung in der Y-Achse über den Tisch 14 erfolgen kann. Zum Umfangschleifen der Wendeschneidplatte 48 wird die Spannvorrichtung um die A-Achse so geschwenkt, dass die durch den Gegenstößel 38 und den Spannstößel 46 definierte Spannachse horizontal, d.h. parallel zur Y-Achse steht. Der Umfang kann nun geschliffen werden, indem der Gegenstößel 38 mittels des Servomotors 34 um die Spannachse gedreht wird. Dabei wird das Werkstück, die Wendeschneidplatte 48 reibschlüssig mitgedreht und auch der Spannstößel 46 dreht sich frei in der Führungsbuchse 44. Anschließend kann die Schneidenkontur der Wendeschneidplatte 48 in derselben Spannung geschliffen werden, wozu die Spannvorrichtung mittels des Motors 28 um die A-Achse geschwenkt wird. Dadurch wird der Anstellwinkel der Spannachse gegen die Achse der Schleifscheibe 22 geschwenkt, um beispielsweise Fasen der Schneidkante, Freischnittflächen am Umfang und eventuelle Mulden in den Plattenebenen herzustellen.The workpiece, namely the indexable insert 48, can now be ground by means of the grinding wheel 22. By means of the cross slide 16, the grinding wheel 22 is delivered in the X-axis and the Z-axis, while a feed movement in the Y-axis via the table 14 can take place. For circumferential grinding of the indexable insert 48, the clamping device is pivoted about the A-axis so that the clamping axis defined by the counter-ram 38 and the clamping ram 46 is horizontal, i. parallel to the Y-axis. The circumference can now be ground by the counter-ram 38 is rotated by means of the servo motor 34 about the clamping axis. In this case, the workpiece, the indexable insert 48 is frictionally rotated and also the clamping rod 46 rotates freely in the guide bushing 44. Subsequently, the cutting contour of the insert 48 can be ground in the same voltage, for which purpose the clamping device is pivoted about the A-axis by means of the motor 28 , As a result, the angle of attack of the clamping axis is pivoted against the axis of the grinding wheel 22 to produce, for example, chamfers of the cutting edge, free cutting surfaces on the circumference and any troughs in the plate planes.

Wie aus den Zeichnungen ersichtlich ist, ist der Gegenstößel 38 so geformt, dass sich sein Durchmesser von dem an dem Wellenflansch des Servomotors 34 angeflanschten Ende konisch gegen das am Werkstück 48 anliegende Ende verringert. Dadurch weisen die Stößel 38 und 46 beiderseits der gespannten Wendeschneidplatte 48 einen kleinen Durchmesser auf, so dass ausreichender Freiraum vorhanden ist, um auch mit einer topfförmigen Schleifscheibe 22 beidseitig an der Wendeschneidplatte 48 angreifen zu können.As can be seen from the drawings, the counter-ram 38 is shaped so that its diameter decreases conically from the end flanged to the shaft flange of the servomotor 34 against the end abutting the workpiece 48. As a result, the plungers 38 and 46 on both sides of the tensioned indexable insert 48 has a small diameter, so that sufficient space is available to even with a cup-shaped Grinding wheel 22 on both sides of the insert 48 to attack.

Nach Beendigung des Schleifvorgangs wird das fertig bearbeitete Werkstück 48 wieder durch Beaufschlagung der Betätigungsstange 50 mittels des pneumatischen Aggregats freigegeben, so dass der beschriebene Zyklus wieder beginnen kann.After completion of the grinding operation, the finished workpiece 48 is released again by acting on the actuating rod 50 by means of the pneumatic unit, so that the cycle described can start again.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

1010
Maschinenbettmachine bed
1212
Rückwandrear wall
1414
Tischtable
1616
Schlittencarriage
1818
SchleifspindeleinheitGrinding Spindles
2020
Spindelmotorspindle motor
2222
Schleifwerkzeuggrinding tool
2424
WerkstückspindeleinheitWorkpiece spindle unit
2626
WerkstückspindelWorkpiece spindle
2828
Motorengine
3030
Grundkörperbody
3232
Schaftkegeltaper shank
3434
Servomotorservomotor
3636
Flanschflange
3838
Gegenstößelagainst ram
4040
Führungsblockguide block
4242
Führungenguides
4444
Führungsbuchseguide bush
4646
Spannstößelclamping rams
4848
WendeschneidplatteIndexable insert
5050
Betätigungsstangeactuating rod
5252
Hubstroke
5454
TellerfedernDisc springs
5656
Laschentabs
5858
Schwenkhebelpivoting lever
6060
Schwenkpunktpivot point
6262
KugelBullet
6464
Anschlagattack
6666
Sicherungsringcirclip
6868
Handling-GreiferHandling grippers
7070
Kassettecassette

Claims (11)

Vorrichtung zum Spannen eines Werkstücks für die Bearbeitung in einer Schleifmaschine, mit zwei Stößeln, nämlich einem Spannstößel und einem Gegenstößel, die in einer Spannachse fluchten und zwischen denen das Werkstück gespannt wird, wobei ein Stößel in der Spannachse mit einer axialen Spannkraft beaufschlagbar ist, während der andere Stößel das Gegenlager zur Abstützung der Spannkraft bildet, und wobei ein Stößel um die Spannachse gesteuert angetrieben drehbar ist, während der andere Stößel um die Spannachse frei drehbar gelagert ist,
dadurch gekennzeichnet, dass die Vorrichtung einen Grundkörper (30) aufweist, der mit Kupplungsmitteln an einer drehend antreibbaren Werkstückspindel (26) der Schleifmaschine montierbar ist, wobei die Spannachse die Rotationsachse (A-Achse) der Werkstückspindel (26) orthogonal schneidet, dass der Gegenstößel (38) in dem Grundkörper (30) axial unverschiebbar und drehend antreibbar aufgenommen ist, dass in dem Grundkörper (30) ein Führungsblock (40) parallel zur Spannachse linear verschiebbar geführt ist, dass der Spannstößel (46) in dem Führungsblock (40) frei drehbar und frei axial verschiebbar geführt ist und dass eine in dem Grundkörper (30) gelagerte Betätigungseinrichtung die Spannkraft auf den Spannstößel (46) mit Übertragungsmitteln überträgt, die nur eine axiale, aber keine radiale Kraftübertragung zulassen.Device for clamping a workpiece for machining in a grinding machine, with two rams, namely a clamping ram and a counter-ram, which are aligned in a clamping axis and between which the workpiece is tensioned, wherein a plunger in the clamping axis with an axial clamping force can be acted upon while the other plunger forms the counter bearing for supporting the clamping force, and wherein a plunger is driven driven driven about the clamping axis, while the other plunger is freely rotatably mounted about the clamping axis,
characterized in that the device comprises a base body (30) which is mountable with coupling means on a rotatably driven workpiece spindle (26) of the grinding machine, wherein the clamping axis orthogonally intersects the axis of rotation (A-axis) of the workpiece spindle (26) that the counter-ram (38) in the main body (30) axially immovable and rotationally driven is recorded, that in the base body (30) a guide block (40) is guided linearly displaceable parallel to the clamping axis, that the clamping ram (46) in the guide block (40) free rotatably and freely axially displaceably guided and that in the base body (30) mounted actuator transmits the clamping force on the clamping ram (46) with transmission means, which allow only an axial, but no radial power transmission. Vorrichtung nach Anspruch 1,
dadurch gekennzeichnet, dass ein den Gegenstößel (38) drehend antreibender Servomotor (34) in dem Grundkörper (30) aufgenommen ist.Device according to claim 1,
characterized in that the counter-ram (38) rotatably driving servomotor (34) is received in the base body (30). Vorrichtung nach Anspruch 1 oder 2,
dadurch gekennzeichnet, dass die Betätigungseinrichtung eine Betätigungsstange (50) aufweist, die axial verschiebbar in dem Grundkörper (30) gelagert ist, in einer axialen Verschiebungsrichtung zur Erzeugung der Spannkraft mit einer Federkraft beaufschlagt ist und in der entgegengesetzten axialen Verschiebungsrichtung durch eine steuerbare Kraft gegen die Federkraft bewegbar ist.Apparatus according to claim 1 or 2,
characterized in that the actuating means comprises an actuating rod (50) which is axially displaceably mounted in the base body (30) is acted upon in a axial displacement direction for generating the clamping force with a spring force and in the opposite axial displacement direction by a controllable force against the Spring force is movable. Vorrichtung nach Anspruch 3,
dadurch gekennzeichnet, dass die Federkraft durch eine die Betätigungsstange (50) koaxial umschließende Druckfeder, insbesondere durch Tellerfedern (54) erzeugt wird.Device according to claim 3,
characterized in that the spring force by a the actuating rod (50) coaxially enclosing compression spring, in particular by disc springs (54) is generated. Vorrichtung nach Anspruch 3 oder 4,
dadurch gekennzeichnet, dass die steuerbare Kraft durch ein pneumatisches Aggregat erzeugt wird.Apparatus according to claim 3 or 4,
characterized in that the controllable force is generated by a pneumatic unit. Vorrichtung nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass die Betätigungseinrichtung die axiale Spannkraft mit einer frei drehbar gelagerten, gegen die Spannkraft axial abgestützten Kugel (62) auf die axial hintere Stirnfläche des Spannstößels (46) überträgt.Device according to one of the preceding claims,
characterized in that the actuating device transmits the axial clamping force with a freely rotatably mounted, against the clamping force axially supported ball (62) on the axially rear end face of the clamping ram (46). Vorrichtung nach Anspruch 3,
dadurch gekennzeichnet, dass die Betätigungsstange (50) mit der Werkstückspindel (26) koaxial fluchtet und die Kupplungsmittel koaxial durchsetzt und dass die axiale Bewegung der Betätigungsstange (50) über einen abgewinkelten Schwenkhebel (58) in die Spannachse umgelenkt wird.Device according to claim 3,
characterized in that the actuating rod (50) is aligned coaxially with the workpiece spindle (26) and passes through the coupling means coaxially and that the axial movement of the actuating rod (50) is deflected via an angled pivot lever (58) in the clamping axis. Vorrichtung nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass der Führungsblock (40) frei axial bewegbar in dem Grundkörper (30) geführt ist, dass der Spannstößel (46) von der Führungsbuchse (44) mitgenommen wird, wenn sich diese von dem Gegenstößel (38) wegbewegt, und dass der Führungsblock (40) von der Betätigungseinrichtung mitgenommen wird, wenn diese in Öffnungsrichtung betätigt wird.Device according to one of the preceding claims,
characterized in that the guide block (40) is freely axially movably guided in the base body (30), that the clamping ram (46) of the guide bush (44) is entrained when it moves away from the counter-ram (38), and that Guide block (40) is taken from the actuator when it is actuated in the opening direction. Vorrichtung nach Anspruch 8,
dadurch gekennzeichnet, dass der Spannstößel (46) einen Sicherungsring (66) aufweist, an welchem die Führungsbuchse (44) zur Mitnahme anschlägt.Device according to claim 8,
characterized in that the clamping ram (46) has a securing ring (66) on which the guide bushing (44) abuts for driving. Vorrichtung nach Anspruch 8,
dadurch gekennzeichnet, dass der Führungsblock (40) einen Anschlag (64) aufweist, der einen Hubweg der Betätigungseinrichtung gegenüber dem Führungsblock (40) in Richtung der Spannachse zulässt und den Führungsblock (40) mitnimmt, wenn die Betätigungseinrichtung in Öffnungsrichtung an diesen Anschlag (64) zur Anlage kommt.Device according to claim 8,
characterized in that the guide block (40) has a stop (64) which allows a stroke of the actuator relative to the guide block (40) in the direction of the clamping axis and the guide block (40) entrains when the actuator in the opening direction of this stop (64 ) comes to the plant. Vorrichtung nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass zum Schleifen von Schneidplatten, insbesondere Wendeschneidplatten (48), der Gegenstößel (38) und der Spannstößel (46) im Bereich ihrer an der Schneidplatte angreifenden Enden einen kleinen Durchmesser aufweisen, so dass beiderseits der Schneidplatte ein Freiraum für das Einschwenken einer Schleifscheibe (22), insbesondere einer topfförmigen Schleifscheibe der Schleifmaschine vorhanden ist.Device according to one of the preceding claims,
characterized in that for grinding cutting inserts, in particular indexable cutting inserts (48), the counter-ram (38) and the clamping ram (46) have a small diameter in the region of their engaging ends on the cutting tip, so that on both sides of the cutting plate a free space for pivoting a grinding wheel (22), in particular a pot-shaped grinding wheel of the grinding machine is present.
EP09011372A 2008-09-08 2009-09-04 Device for tensioning a workpiece for processing in a grinding machine Active EP2161101B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102008046085A DE102008046085A1 (en) 2008-09-08 2008-09-08 Device for clamping a workpiece for processing in a grinding machine

Publications (3)

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EP2161101A2 true EP2161101A2 (en) 2010-03-10
EP2161101A3 EP2161101A3 (en) 2010-12-22
EP2161101B1 EP2161101B1 (en) 2011-08-31

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EP09011372A Active EP2161101B1 (en) 2008-09-08 2009-09-04 Device for tensioning a workpiece for processing in a grinding machine

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EP (1) EP2161101B1 (en)
AT (1) ATE522321T1 (en)
DE (1) DE102008046085A1 (en)
ES (1) ES2369395T3 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107234302A (en) * 2017-07-21 2017-10-10 彭州市锐利刀具机械有限公司 A kind of clamping device and gear grinding machines
US20210069858A1 (en) * 2019-09-11 2021-03-11 Agathon AG, Maschinenfabrik Modular clamping device

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013213176B4 (en) * 2013-07-04 2015-01-15 Haas Schleifmaschinen Gmbh Device for clamping a workpiece
CN112757058B (en) * 2020-12-28 2022-01-14 广东鼎泰机器人科技有限公司 Cutter equipment of polishing
CN113146469A (en) * 2021-05-14 2021-07-23 中航动力株洲航空零部件制造有限公司 Grinding fixture for part machining
CN113547346B (en) * 2021-07-01 2022-12-09 山东元塑管业有限公司 Full-automatic stretch cutting equipment is used in production of high-efficient safe type helical bellows

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1579954A1 (en) 2004-03-25 2005-09-28 WENDT GmbH Ram clamping device

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4115956A (en) * 1977-06-28 1978-09-26 S. E. Huffman Corporation Programmably controlled machine for grinding end cutting tools and the like
FR2720021B1 (en) * 1994-05-19 1996-08-02 Buchmann Optical Eng Ophthalmic lens grinding machine comprising means for controlling the clamping value of the blank of the grinding glass.
DE10008710C2 (en) * 2000-02-24 2002-01-10 Loh Optikmaschinen Ag Device for centering clamping of optical lenses for their edge processing

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1579954A1 (en) 2004-03-25 2005-09-28 WENDT GmbH Ram clamping device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107234302A (en) * 2017-07-21 2017-10-10 彭州市锐利刀具机械有限公司 A kind of clamping device and gear grinding machines
CN107234302B (en) * 2017-07-21 2023-11-10 彭州市锐利刀具机械有限公司 Clamping device and gear grinding machine
US20210069858A1 (en) * 2019-09-11 2021-03-11 Agathon AG, Maschinenfabrik Modular clamping device
CN112476077A (en) * 2019-09-11 2021-03-12 阿加森机械制造股份有限公司 Modular clamping device
EP3792001A1 (en) * 2019-09-11 2021-03-17 Agathon AG, Maschinenfabrik Modular clamping device

Also Published As

Publication number Publication date
ATE522321T1 (en) 2011-09-15
EP2161101B1 (en) 2011-08-31
EP2161101A3 (en) 2010-12-22
DE102008046085A1 (en) 2010-03-11
ES2369395T3 (en) 2011-11-30

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