EP2859994B1 - Device for clamping a workpiece - Google Patents
Device for clamping a workpiece Download PDFInfo
- Publication number
- EP2859994B1 EP2859994B1 EP14173895.5A EP14173895A EP2859994B1 EP 2859994 B1 EP2859994 B1 EP 2859994B1 EP 14173895 A EP14173895 A EP 14173895A EP 2859994 B1 EP2859994 B1 EP 2859994B1
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- EP
- European Patent Office
- Prior art keywords
- ram
- yoke
- counter
- clamp
- arm
- 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.)
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- 230000002093 peripheral effect Effects 0.000 claims description 3
- 238000005452 bending Methods 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- 238000003754 machining Methods 0.000 description 3
- 230000007935 neutral effect Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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Classifications
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- 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
- 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
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 workpieces for example, inserts for lathes for machining with a grinding wheel between two plungers are stretched.
- the EP 1 579 955 B1 known to receive the two plungers axially aligned in two legs of a C-shaped yoke.
- the first plunger is driven rotatably controlled by means of an axis of the grinding machine to align the tensioned workpiece in the circumferential angle against the grinding wheel.
- the second plunger is rotatably mounted in the yoke and axially supported on the leg of the yoke.
- the workpiece is tensioned between the two tappets by the yoke with the second plunger force applied on the first plunger is moved axially.
- the first plunger is rotatably driven and mounted axially supported in the machine.
- the second plunger is axially displaceable axially guided in the machine.
- To generate the axial clamping force of the second plunger is subjected to force by means of a clamping bracket.
- the clamping bracket is designed as a two-armed lever whose bearing is held by means of a tie rod on the machine frame.
- the clamping bracket is pivoted by means of a hydraulic cylinder unit. The large axial clamping force does not lead to misalignment of the plunger.
- the invention has for its object to provide a device for clamping a workpiece for machining in a grinding machine, in which large axial clamping forces do not lead to a deformation of the yoke and which is suitable for a modular attachment to a conventional grinding machine.
- the axial clamping force is generated by a suitable power source, in particular by a cylinder unit, and acts on the clamping bracket.
- the one clamping bracket thereby supports the first plunger axially against the clamping force, while the second clamping bracket moves the second plunger axially force-loaded against the first plunger.
- the entire axial clamping force is supported within the device by the two clamping bracket.
- the device can be mounted with the first plunger on an axis of a grinding machine, without the high axial clamping force acting on the bearing of this axis.
- the device is thus eminently suitable for modular mounting on an axle of a conventional grinding machine, without the need for the bearing of this axle to be designed to accommodate axial forces or to be rebuilt.
- a tie rod is provided in a preferred embodiment in the yoke.
- the tie rod is fixed only in its position in the yoke and extends with radial play through a bore of the yoke.
- the tie rod is attached at one end to one end of the yoke and extends through the bore to the other end of the yoke.
- the clamps are mounted at the two ends of the tie rod. The entire axial clamping force becomes exclusive taken up by the tie rod and is not introduced into the yoke. Although the high axial clamping force may optionally lead to a small elongation of the tie rod, under no circumstances causes a deformation of the yoke.
- the clamps are designed as two-armed lever, each attacking with one arm on the associated plunger, while on the other arm, the power source for the clamping force, for example a cylinder unit, attacks.
- the power source for the clamping force for example a cylinder unit
- the clamping bracket which moves the one plunger axially, is pivotally mounted on the yoke and in particular on the tie rod
- the other clamping bracket which supports the associated plunger only axially against the clamping force, to be rigidly mounted on the yoke.
- this clamping bracket is pivotally mounted, so that a small axial relative movement of the yoke against the associated plunger is possible. This is advantageous because it can tolerate a slight axial play in the positioned assembly of the yoke with respect to the ram coupled to the axis of the grinder.
- the device according to the invention is suitable for grinding machines in which the workpiece and the grinding tool, namely the grinding wheel, are linearly movable relative to one another in three spatial axes.
- the workpiece is clamped on a rotational axis aligned in the direction of one of these linear axes in order to be able to rotate the workpiece circumferentially relative to the grinding wheel.
- Another rotary axis allows the mutual pivoting of Workpiece and grinding wheel to machine the peripheral contour of the workpiece.
- the grinding machine is designed as a five-axis grinding machine, in which the workpiece and the grinding wheel in the three mutually orthogonal linear axes, the X-axis, the Y-axis and the Z-axis, are movable relative to each other.
- the workpiece is clamped by means of the clamping device described below on a rotatably rotatable rotary axis, the A-axis, whose axis of rotation lies in the X-axis and which is movable in the X-axis.
- the clamping device has a yoke 10, which is C-shaped and consists of a straight yoke back 12 and two legs 14 and 16.
- the legs 14 and 16 are respectively formed at the ends of the yoke back 12 and protrude from the yoke back 12 substantially at right angles and parallel to each other in the same direction.
- In the first leg 14 and the second leg 16 each have a bearing bore 18 and 20 respectively.
- the axes of the bearing bore 18 of the first leg 14 and the bearing bore 20 of the second leg 16 are aligned coaxially and extend substantially parallel to the longitudinal extension of the yoke back 12th
- a support plate 36 is preferably used, which carries the yoke 10 and on which the yoke 10 is secured to the yoke back 12.
- the support plate 36 is mounted to a table 38 of the grinding machine carrying the A-axis 30 in such a manner that the axes of the plunger 22 and the counter-slide 28 are aligned with the A-axis 30.
- the support plate 36 can be mounted for example in T-slots of the table 38, which extend in the direction parallel to the A-axis 30 X-direction.
- the support plate 36 is positionable with the yoke 10 so that the plunger 22 with the A-axis 30 can be coupled.
- shims 40 can be inserted between the table 38 and the support plate 36.
- the table 38 is preferably movable in the X-axis.
- a first clamping bracket 42 is arranged at the end formed with the first leg 14 of the yoke 10.
- a second clamping bracket 44 is arranged at the opposite, the second leg 16 associated end of the yoke 10.
- the clamping bracket 42 and 44 are each formed as a two-armed lever.
- the bearing point 46 of the first tensioning bow 42 and the bearing point 48 of the second tensioning bow 44 are each arranged at the ends of the yoke 10 so that their imaginary connecting line runs in the neutral fiber of the yoke back 12.
- the first clamping bow 42 is arranged substantially parallel to the first leg 14.
- the first clamping bracket 42 engages with an arm 50 on the plunger 22 and supports it against axial application of force.
- the arm 50 engages around the shaft 24 of the plunger 22 fork-shaped, wherein at the free ends of the fork-shaped arm 50 each have a cam roller 52 is mounted.
- the cam rollers 52 of the two forked ends of the arm 50 are diametrically opposed to each other in a circumferential groove 54 of the shaft 24. This allows the shaft 24 and thus the plunger 22 rotate relative to the arm 50, but not move axially.
- Alternative bearings are possible which cause rotation of the shaft 24 and axial pressure support.
- a pressure sleeve with a thrust bearing enclose the shaft 24 and the arm 50 engages non-rotatably on the pressure sleeve.
- the second clamping bow 44 is also designed as a two-armed lever and at its bearing point 48 in the plane of the C-shaped Joches 10 pivotally hinged.
- the second clamping bracket 44 engages with an arm 56 on the counter-ram 28.
- the arm 56 pushes the counter-plunger 28 axially in the bearing bore 20 of the second leg 16 against the plunger 22.
- the arm 56 of the second tension bow 44 engages this on the rear end face of the counter-plunger 28.
- a bearing needle 58 is inserted, which is perpendicular to the axis of the counter-ram 28 and perpendicular to the pivot plane of the second tensioning bow 44.
- the bearing needle allows the pivoting movement of the arm 56 of the second tensioning bow 44 to be converted into the linear axial movement of the counter-tappet 28 without radial forces acting on the counter-tappet 28 and its bearing in the bearing bore 20.
- the bearings 46 and 48 of the clamping bracket 42 and 44 are attached to a tie rod 68 inserted into the yoke 10.
- the tie rod 68 is formed as a circular cylindrical rod which extends in the longitudinal direction of the yoke back 12 substantially in the neutral fiber.
- the tie rod 68 is inserted into a through hole 70 of the yoke back 12.
- At the first leg 14 associated end of the tie rod 68 is screwed with a short thread 72 in the bore 70.
- To the thread 72 then extends the tie rod 68 with a radial clearance in the bore 70, whose inner diameter is slightly larger than the outer diameter of the tie rod 68.
- fixation of the tie rod 68 in the yoke 10 may also be provided in another axial position of the bore 70 and the tie rod 68. However, it must be ensured that no axial or radial forces are introduced into the yoke 10 by the tie rod 68.
- a power source is used, which is shown in the illustrated embodiment as a cylinder unit 64, in particular as a hydraulic cylinder unit 64.
- the cylinder unit 64 is arranged on the side opposite the legs 14 and 16 outside of the yoke 10 and extends substantially parallel to the Jochguren 12. The cylinder unit 64 allows pivoting of the second tensioning bow 44 relative to the first clamping bracket 42nd
- the first clamping bracket 42 may be connected at its bearing 46 fixed to the tie rod 68 and thus to the yoke 10. It is also possible that also the first clamping bracket 42 is mounted at its bearing point 46 in the plane of the yoke 10 pivotally mounted on the tie rod 68 and the yoke 10. A pivotable mounting of the first tension bow 42 allows the compensation assembly tolerances of the yoke 10 with respect to the A-axis 30 in the X-direction.
- the clamping device can therefore be mounted as a module on a rotatably driven axle of a conventional grinding machine, without requiring an increase in the storage of this axis in the grinding machine. Likewise, an entry of originating from the tension of the workpiece forces in the attachment of the yoke 10 is excluded.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Grinding Of Cylindrical And Plane Surfaces (AREA)
Description
Die Erfindung betrifft eine Vorrichtung zum Spannen eines Werkstückes 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 Spannvorrichtungen dieser Gattung werden die Werkstücke, zum Beispiel Schneidplatten für Drehmaschinen für die Bearbeitung mit einer Schleifscheibe zwischen zwei Stößeln gespannt. Um einen möglichst freien Zugang der Schleifscheibe zu dem Werkstück zu haben, ist es zum Beispiel aus der
Da das Werkstück nur kraftschlüssig zwischen den Stößeln gespannt ist, ist eine hohe axiale Spannkraft erforderlich. Diese hohe Spannkraft wird bei dieser bekannten Vorrichtung durch den zweiten Stößel an dem Schenkel des C-förmigen Joches abgestützt. Dadurch kann eine Verbiegung des Schenkels verursacht werden, durch welche ein Abweichen der zwei Stößel aus der exakten axialen Fluchtung bewirkt wird.Since the workpiece is only clamped frictionally between the plungers, a high axial clamping force is required. This high clamping force is supported in this known device by the second plunger on the leg of the C-shaped yoke. As a result, a bending of the leg can be caused by which a deviation of the two plungers from the exact axial alignment is effected.
Aus der
Der Erfindung liegt die Aufgabe zugrunde, eine Vorrichtung zum Spannen eines Werkstückes für die Bearbeitung in einer Schleifmaschine zu schaffen, bei welcher große axiale Spannkräfte nicht zu einer Verformung des Joches führen und welche sich für einen modulartigen Anbau an einer herkömmlichen Schleifmaschine eignet.The invention has for its object to provide a device for clamping a workpiece for machining in a grinding machine, in which large axial clamping forces do not lead to a deformation of the yoke and which is suitable for a modular attachment to a conventional grinding machine.
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.
Die erfindungsgemäße Vorrichtung zum Spannen eines Werkstückes für die Bearbeitung in einer Schleifmaschine weist ein C-förmiges Joch auf. In den beiden Schenkeln des Joches ist jeweils einer der beiden Stößel in der Weise gelagert, dass die beiden Stößel axial fluchten. Die hohe axiale Spannkraft, mit welcher das Werkstück zwischen den Stößeln gehalten wird, wird jeweils in einen Spannbügel eingeleitet. Die Spannbügel sind an dem Joch in einer solchen Position gelagert, dass eine gedachte Verbindungslinie der beiden Lagerstellen in dem Jochrücken verläuft und somit in der mechanisch neutralen Faser des Joches. Die axiale Spannkraft der Stößel kann somit nicht zu einem Verbiegen und Auseinanderspreizen der Schenkel des Joches führen. Auch bei einer hohen Spannkraft bleiben die Stößel axial fluchtend in den Schenkeln des Joches geführt. Die axiale Spannkraft wird durch eine geeignete Kraftquelle, insbesondere durch ein Zylinderaggregat, erzeugt, und wirkt auf die Spannbügel ein. Der eine Spannbügel stützt dabei den ersten Stößel axial gegen die Spannkraft ab, während der zweite Spannbügel den zweiten Stößel axial kraftbeaufschlagt gegen den ersten Stößel bewegt. Dadurch wird die gesamte axiale Spannkraft innerhalb der Vorrichtung durch die beiden Spannbügel abgestützt. Die Vorrichtung kann mit dem ersten Stößel an eine Achse einer Schleifmaschine angebaut werden, ohne dass die hohe axiale Spannkraft auf die Lagerung dieser Achse einwirkt. Die Vorrichtung eignet sich dadurch hervorragend für einen modulartigen Anbau an einer Achse einer herkömmlichen Schleifmaschine, ohne dass die Lagerung dieser Achse für die Aufnahme von axialen Kräften konstruiert sein muss oder umgebaut werden muss.The inventive device for clamping a workpiece for processing in a grinding machine has a C-shaped yoke. In the two legs of the yoke in each case one of the two plungers is mounted in such a way that the two plungers are axially aligned. The high axial clamping force with which the workpiece is held between the plungers, is each introduced into a clamping bracket. The clamping straps are mounted on the yoke in such a position that an imaginary connecting line of the two bearing points runs in the yoke back and thus in the mechanically neutral fiber of the yoke. The axial clamping force of the plunger can thus not lead to bending and spreading apart of the legs of the yoke. Even with a high clamping force, the plungers remain axially aligned in the legs of the yoke. The axial clamping force is generated by a suitable power source, in particular by a cylinder unit, and acts on the clamping bracket. The one clamping bracket thereby supports the first plunger axially against the clamping force, while the second clamping bracket moves the second plunger axially force-loaded against the first plunger. As a result, the entire axial clamping force is supported within the device by the two clamping bracket. The device can be mounted with the first plunger on an axis of a grinding machine, without the high axial clamping force acting on the bearing of this axis. The device is thus eminently suitable for modular mounting on an axle of a conventional grinding machine, without the need for the bearing of this axle to be designed to accommodate axial forces or to be rebuilt.
Um jegliche Einwirkung der axialen Spannkraft auf das Joch vollständig auszuschließen, ist in einer bevorzugten Ausführung in dem Joch ein Zuganker vorgesehen. Der Zuganker ist nur in seiner Lage in dem Joch fixiert und erstreckt sich mit radialem Spiel durch eine Bohrung des Joches. Vorzugsweise ist der Zuganker mit seinem einen Ende an dem einen Ende des Joches befestigt und verläuft durch die Bohrung zu dem anderen Ende des Joches. Die Spannbügel sind an den beiden Enden des Zugankers gelagert. Die gesamte axiale Spannkraft wird ausschließlich von dem Zuganker aufgenommen und wird nicht in das Joch eingeleitet. Die hohe axiale Spannkraft kann gegebenenfalls zwar zu einer geringen Längendehnung des Zugankers führen, bewirkt jedoch unter keinen Umständen eine Verformung des Joches.In order to completely exclude any action of the axial clamping force on the yoke, a tie rod is provided in a preferred embodiment in the yoke. The tie rod is fixed only in its position in the yoke and extends with radial play through a bore of the yoke. Preferably, the tie rod is attached at one end to one end of the yoke and extends through the bore to the other end of the yoke. The clamps are mounted at the two ends of the tie rod. The entire axial clamping force becomes exclusive taken up by the tie rod and is not introduced into the yoke. Although the high axial clamping force may optionally lead to a small elongation of the tie rod, under no circumstances causes a deformation of the yoke.
In einer zweckmäßigen Ausführung sind die Spannbügel als zweiarmige Hebel ausgebildet, die jeweils mit einem Arm an dem zugehörigen Stößel angreifen, während an dem anderen Arm die Kraftquelle für die Spannkraft, zum Beispiel ein Zylinderaggregat, angreift. Diese Ausführung ermöglicht einen kompakten Aufbau der Vorrichtung, da die Schenkel des C-förmigen Joches kurz sein können und das Hydraulikaggregat an der Außenseite des Jochrückens angeordnet werden kann.In an expedient embodiment, the clamps are designed as two-armed lever, each attacking with one arm on the associated plunger, while on the other arm, the power source for the clamping force, for example a cylinder unit, attacks. This embodiment allows a compact construction of the device, since the legs of the C-shaped yoke can be short and the hydraulic unit can be arranged on the outside of the yoke back.
Während der Spannbügel, der den einen Stößel axial bewegt, schwenkbar an dem Joch und insbesondere an dem Zuganker gelagert ist, kann der andere Spannbügel, der den zugehörigen Stößel nur axial gegen die Spannkraft abstützt, an sich starr an dem Joch gelagert sein. Vorzugsweise ist jedoch auch dieser Spannbügel schwenkbar gelagert, sodass eine geringe axiale Relativbewegung des Joches gegenüber dem zugehörigen Stößel möglich ist. Dies ist von Vorteil, da hierdurch ein geringes axiales Spiel bei der positionierten Montage des Joches in Bezug auf den mit der Achse der Schleifmaschine gekuppelten Stößel toleriert werden kann.While the clamping bracket, which moves the one plunger axially, is pivotally mounted on the yoke and in particular on the tie rod, the other clamping bracket, which supports the associated plunger only axially against the clamping force, to be rigidly mounted on the yoke. Preferably, however, this clamping bracket is pivotally mounted, so that a small axial relative movement of the yoke against the associated plunger is possible. This is advantageous because it can tolerate a slight axial play in the positioned assembly of the yoke with respect to the ram coupled to the axis of the grinder.
Im Folgenden wird die Erfindung anhand eines in der Zeichnung dargestellten Ausführungsbeispieles näher erläutert. Es zeigen
- Fig. 1
- eine Seitenansicht der Vorrichtung in Richtung der Y-Achse der Schleifmaschine,
- Fig. 2
- eine Draufsicht auf die Vorrichtung in Richtung der Z-Achse der Schleifmaschine,
- Fig. 3
- eine Schrägansicht der Vorrichtung,
- Fig. 4
- eine weitere Schrägansicht der Vorrichtung,
- Fig. 5
- eine
Figur 3 entsprechende Ansicht im Axialschnitt der Vorrichtung, - Fig. 6
- die Stößel der Vorrichtung in der Offenstellung und
- Fig. 7
- die Stößel der Vorrichtung mit gespanntem Werkstück.
- Fig. 1
- a side view of the device in the direction of the Y-axis of the grinding machine,
- Fig. 2
- a top view of the device in the direction of the Z-axis of the grinding machine,
- Fig. 3
- an oblique view of the device,
- Fig. 4
- a further oblique view of the device,
- Fig. 5
- a
FIG. 3 corresponding view in axial section of the device, - Fig. 6
- the plunger of the device in the open position and
- Fig. 7
- the ram of the device with a clamped workpiece.
Die erfindungsgemäße Spannvorrichtung ist insbesondere vorgesehen, um ein Werkstück an parallel geschliffenen Flächen rein kraftschlüssig zu spannen. Hierdurch ist es möglich, Schleifbearbeitungen am Umfang des Werkstückes vorzunehmen. Ein Beispiel für solche Werkstücke sind Wendeschneidplatten für Werkzeugmaschinen. Die Spannung in einem C-förmigen Joch zwischen zwei axial gegeneinander bewegbaren Stößeln erlaubt einen großen Schwenkbereich der Schleifscheibe gegenüber dem Werkstück, sodass nicht nur der Umfang des Werkstückes bearbeitet werden kann, sondern gegebenenfalls auch die Umfangskontur.The clamping device according to the invention is in particular provided to clamp a workpiece on parallel ground surfaces purely frictionally. This makes it possible to make grinding operations on the circumference of the workpiece. An example of such workpieces are indexable inserts for machine tools. The tension in a C-shaped yoke between two axially movable rams allows a large pivoting range of the grinding wheel relative to the workpiece, so that not only the circumference of the workpiece can be processed, but possibly also the peripheral contour.
Die erfindungsgemäße Vorrichtung eignet sich für Schleifmaschinen, bei welchen das Werkstück und das Schleifwerkzeug, nämlich die Schleifscheibe, in drei räumlichen Achsen linear relativ zueinander bewegbar sind. Das Werkstück wird an einer in Richtung einer dieser linearen Achsen ausgerichteten rotatorischen Achse gespannt, um das Werkstück in Umfangsrichtung gegenüber der Schleifscheibe drehen zu können. Eine weitere rotatorische Achse erlaubt das gegenseitige Verschwenken von Werkstück und Schleifscheibe, um die Umfangskontur des Werkstückes zu bearbeiten.The device according to the invention is suitable for grinding machines in which the workpiece and the grinding tool, namely the grinding wheel, are linearly movable relative to one another in three spatial axes. The workpiece is clamped on a rotational axis aligned in the direction of one of these linear axes in order to be able to rotate the workpiece circumferentially relative to the grinding wheel. Another rotary axis allows the mutual pivoting of Workpiece and grinding wheel to machine the peripheral contour of the workpiece.
Im dargestellten Ausführungsbeispiel ist die Schleifmaschine als fünf-achsige Schleifmaschine ausgebildet, bei welcher das Werkstück und die Schleifscheibe in den drei orthogonal zueinander verlaufenden linearen Achsen, der X-Achse, der Y-Achse und der Z-Achse, gegeneinander verfahrbar sind. Das Werkstück wird mittels der nachfolgend beschriebenen Spannvorrichtung an einer drehantreibbaren rotatorischen Achse, der A-Achse, gespannt, deren Rotationsachse in der X-Achse liegt und die in der X-Achse verfahrbar ist. Die Antriebsspindel der Schleifscheibe ist in der Y-Achse und der Z-Achse verfahrbar und mittels einer in der Z-Richtung liegenden Rotationsachse, der C-Achse verschwenkbar. Andere Gestaltungen und Zuordnungen der linearen Achsen und der rotatorischen Achsen sind im Rahmen der Erfindung möglich und werden vom Schutz erfasst.In the illustrated embodiment, the grinding machine is designed as a five-axis grinding machine, in which the workpiece and the grinding wheel in the three mutually orthogonal linear axes, the X-axis, the Y-axis and the Z-axis, are movable relative to each other. The workpiece is clamped by means of the clamping device described below on a rotatably rotatable rotary axis, the A-axis, whose axis of rotation lies in the X-axis and which is movable in the X-axis. The drive spindle of the grinding wheel is movable in the Y-axis and the Z-axis and can be pivoted by means of a rotational axis lying in the Z-direction, the C-axis. Other configurations and assignments of the linear axes and the rotational axes are possible within the scope of the invention and are covered by the protection.
Die erfindungsgemäße Spannvorrichtung weist ein Joch 10 auf, welches C-förmig ausgebildet ist und aus einem geraden Jochrücken 12 und zwei Schenkeln 14 und 16 besteht. Die Schenkel 14 und 16 sind jeweils an den Enden des Jochrückens 12 angeformt und ragen im Wesentlichen rechtwinklig und parallel zueinander in derselben Richtung von dem Jochrücken 12 ab. In dem ersten Schenkel 14 und dem zweiten Schenkel 16 ist jeweils eine Lagerbohrung 18 beziehungsweise 20 ausgebildet. Die Achsen der Lagerbohrung 18 des ersten Schenkels 14 und der Lagerbohrung 20 des zweiten Schenkels 16 fluchten koaxial und verlaufen im Wesentlichen parallel zur Längserstreckung des Jochrückens 12.The clamping device according to the invention has a
In der Lagerbohrung 18 des ersten Schenkels 14 ist ein Stößel 22 drehbar gelagert. Der Stößel 22 besteht aus einer Welle 24 und einem Spannstift 26. Die Welle 24 ist mittels eines Gleitlagers oder eines Nadellagers 25 drehbar in der Lagerbohrung 18 des ersten Schenkels 14 gelagert. Der Spannstift 26 ist auswechselbar koaxial in das dem zweiten Schenkel 16 zugewandte Ende der Welle 24 eingesetzt.In the bearing bore 18 of the
In die Lagerbohrung 20 des zweiten Schenkels 16 ist drehbar und axial verschiebbar ein Gegenstößel 28 eingesetzt. Die Achsen des Spannstiftes 26 und des Gegenstößels 28 fluchten somit axial.In the bearing bore 20 of the
Das Joch 10 wird ortsfest an der Schleifmaschine montiert, wobei das Joch so positioniert ist, dass die Achsen des Stößels 22 und des Gegenstößels 28 mit der Rotationsachse einer drehantreibbaren Achse 30 der Schleifmaschine fluchten. Im dargestellten Ausführungsbeispiel ist die drehantreibbare Achse 30 die A-Achse der Schleifmaschine. Damit die erfindungsgemäße Spannvorrichtung als selbstständiges Modul an die Schleifmaschine angebaut werden kann, ist die Welle 24 beispielsweise mit einem Schaftkonus 32 in einen Aufnahmekonus 34 der Achse 30 einsetzbar.The
Um das Joch 10 exakt positioniert an der Schleifmaschine montieren zu können, wird vorzugsweise eine Stützplatte 36 verwendet, die das Joch 10 trägt und an der das Joch 10 mit dem Jochrücken 12 befestigt ist. Die Stützplatte 36 wird an einem die A-Achse 30 tragenden Tisch 38 der Schleifmaschine in der Weise positioniert montiert, dass die Achsen des Stößels 22 und des Gegenstößels 28 mit der A-Achse 30 fluchten. Hierzu kann die Stützplatte 36 beispielsweise in T-Nuten des Tisches 38 montiert werden, die in der zur A-Achse 30 parallelen X-Richtung verlaufen. In dieser X-Richtung ist die Stützplatte 36 mit dem Joch 10 so positionierbar, dass der Stößel 22 mit der A-Achse 30 kuppelbar ist. Um eine exakte Höhenjustierung des Joches 10 zu gewährleisten, können Unterlegstücke 40 zwischen dem Tisch 38 und die Stützplatte 36 eingesetzt werden. Der Tisch 38 ist vorzugsweise in der X-Achse verfahrbar.In order to mount the
An dem mit dem ersten Schenkel 14 ausgebildeten Ende des Joches 10 ist ein erster Spannbügel 42 angeordnet. An dem entgegengesetzten, dem zweiten Schenkel 16 zugeordneten Ende des Joches 10 ist ein zweiter Spannbügel 44 angeordnet. Die Spannbügel 42 und 44 sind jeweils als zweiarmige Hebel ausgebildet. Dabei sind die Lagerstelle 46 des ersten Spannbügels 42 und die Lagerstelle 48 des zweiten Spannbügels 44 jeweils an den Enden des Joches 10 so angeordnet, dass ihre gedachte Verbindungslinie in der neutralen Faser des Jochrückens 12 verläuft.At the end formed with the
Der erste Spannbügel 42 ist im Wesentlichen parallel zum ersten Schenkel 14 angeordnet. Der erste Spannbügel 42 greift mit einem Arm 50 an dem Stößel 22 an und stützt diesen gegen eine axiale Kraftbeaufschlagung ab. In dem dargestellten Ausführungsbeispiel umgreift der Arm 50 die Welle 24 des Stößels 22 gabelförmig, wobei an den freien Enden des gabelförmigen Armes 50 jeweils eine Kurvenrolle 52 gelagert ist. Die Kurvenrollen 52 der beiden gabelförmigen Enden des Armes 50 greifen diametral zueinander in eine Umfangsnut 54 der Welle 24. Dadurch kann sich die Welle 24 und damit der Stößel 22 gegenüber dem Arm 50 drehen, jedoch nicht axial bewegen. Alternative Lagerungen sind möglich, die eine Drehung der Welle 24 und eine axiale Druckabstützung bewirken. Beispielsweise kann eine Druckhülse mit einem Axiallager die Welle 24 umschließen und der Arm 50 greift unverdrehbar an der Druckhülse an.The
Der zweite Spannbügel 44 ist ebenfalls als zweiarmiger Hebel ausgebildet und an seiner Lagerstelle 48 in der Ebene des C-förmigen Joches 10 schwenkbar angelenkt. Der zweite Spannbügel 44 greift mit einem Arm 56 an dem Gegenstößel 28 an. Bei einem Verschwenken des zweiten Spannbügels 44 drückt der Arm 56 den Gegenstößel 28 axial in der Lagerbohrung 20 des zweiten Schenkels 16 gegen den Stößel 22. Der Arm 56 des zweiten Spannbügels 44 greift hierzu an der hinteren Stirnfläche des Gegenstößels 28 an. Zwischen die mit einem koaxialen Drehlager 57 ausgebildete hintere Stirnfläche des Gegenstößels 28 und den Arm 56 des zweiten Spannbügels 44 ist eine Lagernadel 58 eingesetzt, die senkrecht zur Achse des Gegenstößels 28 und senkrecht zur Schwenkebene des zweiten Spannbügels 44 angeordnet ist. Die Lagernadel ermöglicht, dass die Schwenkbewegung des Armes 56 des zweiten Spannbügels 44 in die lineare axiale Bewegung des Gegenstößels 28 umgesetzt wird, ohne dass auf den Gegenstößel 28 und seine Lagerung in der Lagerbohrung 20 radiale Kräfte einwirken.The
Die Lagerstellen 46 und 48 der Spannbügel 42 und 44 sind an einem in das Joch 10 eingesetzten Zuganker 68 angebracht. Wie am Besten in der Schnittdarstellung der
Zwischen den dem Arm 50 entgegengesetzten Arm 60 des ersten Spannbügels 42 und den dem Arm 56 entgegengesetzten Arm 62 des zweiten Spannbügels 44 ist eine Kraftquelle eingesetzt, die im dargestellten Ausführungsbeispiel als Zylinderaggregat 64, insbesondere als hydraulisches Zylinderaggregat 64, dargestellt ist. Das Zylinderaggregat 64 ist an der den Schenkeln 14 und 16 entgegengesetzten Außenseite des Joches 10 angeordnet und verläuft im Wesentlichen parallel zu dem Jochrücken 12. Das Zylinderaggregat 64 ermöglicht ein Verschwenken des zweiten Spannbügels 44 gegenüber dem ersten Spannbügel 42.Between the
Der erste Spannbügel 42 kann an seiner Lagerstelle 46 fest mit dem Zuganker 68 und damit mit dem Joch 10 verbunden sein. Ebenso ist es möglich, dass auch der erste Spannbügel 42 an seiner Lagerstelle 46 in der Ebene des Joches 10 schwenkbar an dem Zuganker 68 bzw. dem Joch 10 gelagert ist. Eine schwenkbare Lagerung des ersten Spannbügels 42 ermöglicht den Ausgleich von Montagetoleranzen des Joches 10 gegenüber der A-Achse 30 in der X-Richtung.The
Zur Aufnahme eines Werkstückes 66 wird zunächst der zweite Spannbügel 44 mittels des Zylinderaggregats 64 so verschwenkt, dass der Gegenstößel 28 von dem Stößel 22 axial weggezogen wird. Diese Position ist beispielsweise in den
Da die gesamte auf den Stößel 22 wirkende axiale Spannkraft durch das Parallelogramm von erstem Spannbügel 42 und zweitem Spannbügel 44 abgestützt wird, bewirkt diese hohe axiale Spannkraft keine axiale Belastung der Lagerung der A-Achse 30 in der Schleifmaschine. Die Spannvorrichtung kann daher als Modul an eine drehantreibbare Achse einer herkömmlichen Schleifmaschine angebaut werden, ohne dass eine Verstärkung der Lagerung dieser Achse in der Schleifmaschine erforderlich ist. Ebenso ist ein Eintrag von aus der Spannung des Werkstückes herrührenden Kräfte in die Befestigung des Joches 10 ausgeschlossen. Die Lagerung des Stößels 22 in der Lagerbohrung 18 des ersten Schenkels 14 und die Lagerung des Gegenstückes 28 in der Lagerbohrung 20 des zweiten Schenkels 16 müssen keine radialen Kräfte abstützen, sodass diese Rotationslager ohne Beeinflussung durch die axiale Spannkraft leicht drehen.Since the entire force acting on the
- 1010
- Jochyoke
- 1212
- JochrückenJochrücken
- 1414
- erster Schenkelfirst leg
- 1616
- zweiter Schenkelsecond leg
- 1818
- Lagerbohrung von 14Bearing bore of 14
- 2020
- Lagerbohrung von 16Bearing bore of 16
- 2222
- Stößeltappet
- 2424
- Wellewave
- 2525
- Nadellagerneedle roller bearings
- 2626
- Spannstiftdowel pin
- 2828
- Gegenstößelagainst ram
- 3030
- A-AchseA axis
- 3232
- Schaftkonusstem taper
- 3434
- Aufnahmekonusreceiving cone
- 3636
- Stützplattesupport plate
- 3838
- Tischtable
- 4040
- Unterlagstückeunderlay pieces
- 4242
- erster Spannbügelfirst clamp
- 4444
- zweiter Spannbügelsecond clamping bracket
- 4646
- Lagerstelle von 42Depository of 42
- 4848
- Lagerstelle von 44Depository of 44
- 5050
- Arm von 42Arm of 42
- 5252
- Kurvenrollefollower
- 5454
- Umfangsnutcircumferential groove
- 5656
- Arm von 44Arm of 44
- 5757
- Drehlagerpivot bearing
- 5858
- Lagernadelbearing needle
- 6060
- Arm von 42Arm of 42
- 6464
- Zylinderaggregatcylinder unit
- 6666
- Werkstückworkpiece
- 6868
- Zugankertie rods
- 7070
- Bohrungdrilling
- 7272
- Gewindethread
- 7474
- Außenbundouter collar
Claims (11)
- Device for tensioning a workpiece for processing in a grinding machine, having a C-shaped yoke (10) which has a back (12) and a first limb (14) and a second limb (16), which protrude from the yoke rear (12) angled in the same direction, having a ram (22) received rotatably in the first limb (14) and a counter ram (28) received rotatably in the second limb (16), wherein the ram (22) and the counter ram (28) align coaxially with each other, wherein the ram (22) is able to be driven rotatably in a controlled manner and wherein the ram (22) and the counter ram (28) are moveable relative to each other axially by means of a power source (64) in order to tension the workpiece (66) between the ram (22) and the counter ram (28) using an axial tensioning force,
characterised in that the yoke (10) is able to be assembled to be positioned on the grinding machine, such that the axles of the ram (22) and the counter ram (28) align with an axle (30) of the grinding machine which is able to be driven rotatably; the ram (22) is able to be coupled axially to the axle (30) which is able to be driven rotatably; a first clamp (42) is arranged on the yoke (10) and supports the ram (22) axially against the tensioning force using an arm (50); a second clamp (44) is arranged to be pivotable on the yoke (10) and moves the counter ram (28) axially in a force-loaded manner using an arm (56); the bearing points (46, 48) of the first clamp (42) and of the second clamp (44) are arranged on the ends of the yoke (10) which are opposite each other in the region of the yoke rear (12); and the tensioning force is guided via the clamps (42, 44) into the ram (22) and the counter ram (28). - Device according to claim 1,
characterised in that the yoke (10) has a tie rod (68) which is fastened to the yoke (10) and extends through a bore (70) of the yoke (10) with radial clearance; and the bearing points (46, 48) of the clamps (42, 44) are arranged on the ends of the tie rod (68) which are opposite each other. - Device according to claim 2,
characterised in that the tie rod (68) is screwed into the bore (70) using a thread (72). - Device according to one of the preceding claims,
characterised in that the clamps (42, 44) are formed as two-arm levers respectively, the one arm (50 or 56) thereof engages with the ram (22) or the counter ram (28), and the power source (64) engages with the other arm (60 or 62) thereof. - Device according to one of the preceding claims,
characterised in that the power source is a cylinder aggregate (64) inserted between the clamps (42, 44). - Device according to one of the preceding claims,
characterised in that the first clamp (42) is mounted pivotably on the yoke (10). - Device according to one of the preceding claims,
characterised in that the yoke (10) is able to be assembled to be positioned on the grinding machine to be adjustable in an axle of the grinding machine in parallel to the axle (30) which is able to be driven rotatably. - Device according to one of the preceding claims,
characterised in that the first clamp (42) encompasses the ram (22) at the outer periphery thereof with an axial thrust bearing. - Device according to claim 8,
characterised in that the clamp (42) encompasses the ram (22) in a fork shape and engages with a peripheral groove (54) of the ram (22) with cam rollers (52). - Device according to one of the preceding claims,
characterised in that the second clamp (44) engages with the end of the counter ram (28) facing away from the ram (22). - Device according to claim 10,
characterised in that the second clamp (44) engages with the end of the counter ram (28) formed with a pivot bearing (57) via a bearing needle (58) arranged perpendicularly to the pivot plane of the clamp (44) and the axle of the counter ram (28).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102013213176.3A DE102013213176B4 (en) | 2013-07-04 | 2013-07-04 | Device for clamping a workpiece |
Publications (3)
Publication Number | Publication Date |
---|---|
EP2859994A2 EP2859994A2 (en) | 2015-04-15 |
EP2859994A3 EP2859994A3 (en) | 2015-10-28 |
EP2859994B1 true EP2859994B1 (en) | 2016-09-14 |
Family
ID=50982810
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP14173895.5A Active EP2859994B1 (en) | 2013-07-04 | 2014-06-25 | Device for clamping a workpiece |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP2859994B1 (en) |
DE (1) | DE102013213176B4 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106112609A (en) * | 2015-08-19 | 2016-11-16 | 吉林省吉通机械制造有限责任公司 | Wheel stand special hydraulic clamp and clamping using method thereof |
JP2021041525A (en) * | 2019-09-11 | 2021-03-18 | アガトン・アクチエンゲゼルシャフト・マシーネンファブリーク | Modular clamp device |
CN112658911B (en) * | 2020-12-14 | 2023-04-21 | 东莞市协定发五金制品有限公司 | Industrial metal ring product surface smoothing equipment |
CN114619525B (en) * | 2022-03-02 | 2022-10-25 | 湖南铁道职业技术学院 | Numerical control machining center fixed knot constructs |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE265475C (en) * | ||||
US1828530A (en) * | 1927-09-08 | 1931-10-20 | Warren F Fraser | Work supporting mechanism for grinding machines |
DE1924315A1 (en) | 1969-05-13 | 1971-07-29 | Wendt Kg Fritz | Process and machine for grinding workpieces |
CH686349A5 (en) * | 1992-02-10 | 1996-03-15 | Agathon Ag Maschf | Grinding machine for circumferential and Chamfer grinding of cutting inserts, in particular indexable inserts |
DE10008710C2 (en) * | 2000-02-24 | 2002-01-10 | Loh Optikmaschinen Ag | Device for centering clamping of optical lenses for their edge processing |
EP1579955B1 (en) | 2004-03-25 | 2010-09-22 | WENDT GmbH | Ram clamping device |
DE102008046085A1 (en) * | 2008-09-08 | 2010-03-11 | Haas Schleifmaschinen Gmbh | Device for clamping a workpiece for processing in a grinding machine |
-
2013
- 2013-07-04 DE DE102013213176.3A patent/DE102013213176B4/en not_active Expired - Fee Related
-
2014
- 2014-06-25 EP EP14173895.5A patent/EP2859994B1/en active Active
Also Published As
Publication number | Publication date |
---|---|
EP2859994A2 (en) | 2015-04-15 |
EP2859994A3 (en) | 2015-10-28 |
DE102013213176B4 (en) | 2015-01-15 |
DE102013213176A1 (en) | 2015-01-08 |
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