EP3851249B1 - Workpiece clamping device - Google Patents

Description

The invention relates to a workpiece clamping device that is designed to clamp a workpiece. For this purpose, the workpiece clamping device has two clamping bodies which can be moved towards or away from one another in a clamping direction by driving a threaded spindle in order to clamp or release a workpiece.

For example, a workpiece clamping device is off DE 10 2017 122 112 A1 known. A bearing block is arranged in the middle between the displaceably mounted clamping bodies. A threaded spindle for moving the clamping body is designed in several parts. Each part of the threaded spindle is mounted in the bearing block via a threaded end sleeve. The threaded end sleeves rest with a flange on an outer surface of the bearing block. The threaded end sleeves are connected to one another via a reinforcement sleeve. Alternatively, instead of the reinforcement sleeve and the threaded end sleeves, a continuous threaded bearing can also be used.

Another example comes from EP 1 946 890 A1 out. This shows a workpiece clamping device having a base body, a first clamping body that is mounted on the base body so that it can be displaced in the clamping direction, a second clamping body that is mounted on the base body that can be displaced in the clamping direction, a threaded spindle that extends in the clamping direction and has a first threaded section that is equipped with a Mating threads on the first clamp body are engaged and having a second threaded section which is in engagement with a mating thread on the second clamp body, the threaded spindle having a centering body which is arranged between the first threaded section and the second threaded section.

Proceeding from the prior art, it is an object of the present invention to center the threaded spindle relative to a central plane in a simple manner and to ensure quick and easy maintenance of the workpiece clamping device.

This problem is solved by a workpiece clamping device with the features of patent claim 1 .

The workpiece clamping device has a first base body and a second base body. Both base bodies have a contact surface on the end face that faces the respective other base body. In a clamping direction, the contact surfaces of the two base bodies face each other at a base body distance. The base body distance is defined by the distance between the contact surface of the first base body and the contact surface of the second base body.

The two base bodies are fastened with a base on a carrier, in particular detachably fastened. A fastening device can be used for fastening. Each base body can be attached to the carrier via a separate attachment device. The carrier can consist of one or more carrier plates. The detachable attachment of the base body to the carrier can be realized by a non-positive and/or positive connection.

A first clamping body is movably mounted in the clamping direction on the first base body. A second clamping body is mounted on the second base body so that it can be displaced in the clamping direction. The clamping bodies can each have a clamping surface with which they act on a workpiece for clamping. Additionally or alternatively, a clamping jaw can be attached to each clamping body, on which there is a clamping surface for clamping a workpiece.

The workpiece clamping device also has a threaded spindle extending in the clamping direction. the The threaded spindle has a first threaded section which engages with a mating thread of the first clamp body. The threaded spindle also has a second threaded section which engages with a mating thread of the second clamp body. The first threaded section and the second threaded section have different directions of rotation or senses of rotation. The amount of the pitch is the same in the first thread section and in the second thread section. When the threaded spindle rotates about its longitudinal spindle axis, the two clamping bodies each move towards or away from one another by the same distance relative to a stationary coordinate system.

The threaded spindle has a centering body between the two threaded sections. The centering body has a centering surface on both sides in the clamping direction. The two centering surfaces define a center plane which is arranged centrally between the two centering surfaces in the clamping direction and is aligned at right angles to the clamping direction. The centering body is preferably rotationally symmetrical. The centering body can have a cylindrical outer contour, for example, and can be designed in particular as a centering sleeve.

The centering body rests with one centering surface on the contact surface of the first base body and with its other, opposite centering surface on the contact surface of the second base body. This ensures that the center plane is located exactly between the two contact surfaces and therefore between the two base bodies. A workpiece can therefore be clamped by means of the clamping body from opposite sides in a centered manner with respect to the central plane.

This configuration of the workpiece clamping device has a very simple structure. To center the threaded spindle relative to the base bodies, it is not necessary to provide a bearing between the base bodies that supports the threaded spindle on the carrier for the workpiece clamping device. The threaded spindle is supported exclusively or mainly via the clamping body and the base body on the carrier.

The threaded spindle is centered via a plain bearing contact between the two pairs of surfaces, each consisting of a contact surface and a centering surface.

It is advantageous if each base body has a closing part that has the contact surface. The closing parts are preferably designed separately from the base bodies and in particular are each detachably fastened to the associated base body. For this purpose, the base body can have a mounting surface that is aligned essentially at right angles to the clamping direction. If the terminating parts are designed as separate elements, for example plate-shaped elements, a material can be selected for production for the terminating parts that does not have to match the material of the base body. The closing part can additionally or alternatively be provided with a coating. Furthermore, the terminating part or at least the at least one contact surface of the terminating part can be precisely manufactured by grinding or another highly precise method. The processing of the final part to create the contact surface is simplified if it can be handled independently of the base body.

In a preferred embodiment, the termination part has multiple contact surfaces. Preferably, each termination part has a first contact surface on a first side and a second contact surface on a second side opposite the first side. It is advantageous if each closing part has a first attachment surface on the first side and a second attachment surface on the second side. The attachment surfaces are designed to detachably attach the end piece to the mounting surface of the associated base body. Thus, each terminating part can be arranged in two different positions or orientations on the associated base body. Either the first contact surface or the second contact surface can come into contact with the adjacent centering surface of the centering body.

In the configuration of the closing part with a plurality of contact surfaces, the contact surfaces can have different distances from the attachment surfaces in the clamping direction. In particular, in a preferred embodiment, there is a first distance between the first contact surface and the second attachment surface in the clamping direction and a second distance is present between the second contact surface and the first attachment surface in the clamping direction. The first distance and the second distance have different amounts. This configuration means that the first contact surface facing the centering body is at a different distance from the mounting surface of the base body when the closing part is in contact with the second mounting surface on the mounting surface than when the closing part is oriented when the second contact surface is facing the centering body and the first mounting surface against the mounting surface. This configuration of the terminating parts allows tolerances to be compensated for when fastening the base body on the carrier, so that the centering body can be arranged between either two first contact surfaces or two second contact surfaces of the terminating parts without jamming. The difference between the first distance and the second distance can preferably be less than 1 mm.

It is advantageous if the first contact surface and the first attachment surface are arranged in a common plane on the first side of the closing part. On the second side, the end piece may have a step separating the second attachment surface and the second contact surface, in particular such that the second attachment surface and the second contact surface extend in parallel planes that are offset from one another in the spanwise direction.

In a further preferred embodiment, each closing part has a recess which is open in particular on a side facing the threaded spindle. The threaded spindle can extend through the recess of the closing part. Viewed in the clamping direction, the recess can have a course in the form of a circular arc, at least in one section, the radius of which is greater than the radius of the threaded spindle at the point running through the recess.

A surface delimiting the recess of the closing part can serve as a delimiting surface. The limiting surface preferably faces the lead screw at a distance when the lead screw is engaged with the mating threads of the clamping bodies. When replacing the clamping body, the boundary surfaces of the end parts can be used as storage areas for the threaded spindle.

It is advantageous if the threaded spindle has a first spindle part with the first threaded section and a separate second spindle part with the second threaded section. The two spindle parts are preferably connected to one another directly or indirectly by a positive connection and/or a non-positive connection and/or a material connection and/or an adhesion-promoting connection. In a preferred embodiment, the two spindle parts are connected to one another by means of the centering body. In this configuration, the centering body can preferably be sleeve-shaped and accommodate the ends of the spindle parts that face one another. It is advantageous if the connection between the ends of the spindle parts and the centering body is produced by a threaded engagement and an additional adhesive connection. This ensures that the connection does not come loose when the threaded spindle is driven in rotation.

Arrangements with at least two workpiece clamping devices can be constructed using the exemplary embodiments of the workpiece clamping device described above. For example, an arrangement can have at least two workpiece clamping devices, the threaded spindles of which extend parallel to one another and at a distance from one another in a longitudinal direction. The two centering bodies are in particular arranged in such a way that they define a common center plane and are symmetrical in the longitudinal direction or are arranged centrally to this common center plane. This allows a workpiece to be clamped centered on the median plane using four or more clamping bodies.

In another arrangement, the lead screw of one workpiece fixture may extend in a longitudinal direction and the lead screw of the other workpiece fixture may extend in a transverse direction perpendicular to the longitudinal direction. The two threaded spindles cross each other at a crossing point. At the crossing point, the threaded spindles can be offset from one another in a vertical direction that is aligned at right angles to the longitudinal direction and at right angles to the transverse direction. In this arrangement, the center plane of the centering body of one threaded spindle preferably extends along the longitudinal axis of the spindle of the other threaded spindle.

If an arrangement has more than two workpiece clamping devices, the clamping bodies of different workpiece clamping devices can be configured differently. For example, a workpiece may be primarily held and clamped via the first clamp body and the second clamp body of one of the workpiece fixtures, while the clamp bodies of the one or more other workpiece fixtures are used to additionally support the workpiece.

• Figuren 1-3 jeweils eine perspektivische Darstellung von unterschiedlichen Anordnungen aufweisend jeweils zwei erfindungsgemäße Werkstückspannvorrichtungen,
• Figur 4 eine teilgeschnittene Darstellung durch einen Grundkörper entlang einer Anbringungsfläche eines am Grundkörper angeordneten Abschlussteils in schematischer Darstellung,
• Figuren 5 und 6 jeweils eine schematische Prinzipdarstellung zum Anordnen eines Ausführungsbeispiels eines Abschlussteils in unterschiedlichen Ausrichtungen,
• Figur 7 eine schematische teilweise geschnittene Teildarstellung eines Ausführungsbeispiels einer Werkstückspannvorrichtung im Bereich einer Mittelebene,
• Figur 8 eine perspektivische Darstellung von weiteren Ausführungsbeispielen einer Werkstückspannvorrichtung mit Grundkörpern, die mehrere gekoppelte Grundkörperteile aufweisen,
• Figur 9 einen Längsschnitt durch ein Ausführungsbeispiel der Werkstückspannvorrichtung aus Figur 8 und
• Figur 10 einen vergrößerten Ausschnitt X aus Figur 9 an einer Verbindungsstelle zwischen zwei Grundkörperteilen.

Advantageous configurations of the invention result from the dependent patent claims, the description and the drawings. In the following, preferred exemplary embodiments of the invention are given with reference to the attached Drawings explained in detail. In the drawings show:

• Figures 1-3 each having a perspective view of different arrangements each having two workpiece clamping devices according to the invention,
• figure 4 a partially sectioned representation through a base body along an attachment surface of a closure part arranged on the base body in a schematic representation,
• Figures 5 and 6 in each case a schematic basic representation for arranging an embodiment of a final part in different orientations,
• figure 7 a schematic partially sectioned partial representation of an embodiment of a workpiece clamping device in the area of a central plane,
• figure 8 a perspective view of further exemplary embodiments of a workpiece clamping device with base bodies that have a plurality of coupled base body parts,
• figure 9 a longitudinal section through an embodiment of the workpiece clamping device figure 8 and
• figure 10 an enlarged detail X from Figure 9 at a junction between two body parts.

In the Figures 1-3 are different arrangements 10 shown with two workpiece clamping devices 11 each. In a modification to the exemplary embodiments shown, an arrangement 10 can have one, two or even more than two workpiece clamping devices 11 . A single workpiece clamping device 11 or an arrangement 10 with a plurality of workpiece clamping devices 11 is set up to clamp a workpiece centered with respect to a median plane M. The workpiece clamping devices 11 are constructed essentially the same, so that first a single workpiece clamping device 11 is explained in detail.

Each workpiece clamping device 11 has a first base body 12 and a second base body 13 . The two base bodies are designed to arrange the workpiece clamping device 11 on a carrier 14 . The carrier 14 has a carrier surface 15 which is planar at least in sections. Each base body 12, 13 has an underside which is flat at least in sections and which is designed to be arranged on the support surface 15 of the support 14.

By means of a fastening device 16 ( figure 7 ) the base bodies 12, 13 can be connected to the carrier 14 in a positive and/or non-positive manner. For this purpose, each base body 12, 13 has several and, for example, four fastening pins 17 projecting away from its underside. There are holes 18 in the carrier 14 into which the fastening pins 17 can engage. The holes 18 and the fastening pins 17 are preferably arranged in a predetermined grid, so that the carrier 14 has a hole grid onto which the base bodies 12, 13 can be inserted at the selected position by means of the fastening pins 17 are.

The fastening device 16 includes a plurality of slides 19 which are slidably arranged in channels 20 of the carrier 14 . Each channel 20 opens into a hole 18 so that a free end of the slide 19 can apply a force to a fastening pin 17 inserted into the hole 18 .

In the exemplary embodiment, each fastening pin 17 has an all-round fastening groove 21 which tapers radially inward via two inclined or wedge surfaces. The slide has an end section which tapers towards its free end via inclined or wedge surfaces, so that it can engage in the fastening groove 21 . To clamp a base body 12, 13 on the carrier 14 and against the carrier surface 15, a number of slides 19 are used to exert a tensile force on the number of fastening pins 17 of one of the base bodies 12, 13 along the direction in which the fastening pin 17 extends, and the fastening pin 17 against a peripheral wall of hole 18 pressed. As a result, the base body 12, 13 is pulled against the support surface 15 with its base and at the same time is fixed in the plane in which the support surface 15 extends.

As already mentioned, each base body 12, 13 can have four fastening pins 17, so that the base body is detachably fastened to the carrier 14 by means of four slides 19.

The carrier 14 can be formed by several separate carrier plates 14a ( figures 1 and 3 ). In each carrier plate 14a there is at least one actuating element 22 accessible from the outside, by means of which a plurality of slides 19, for example four slides 19, can be carried out essentially synchronously in the relevant carrier plate 14a. Depending on the arrangement of the base body 12 , 13 in question in the carrier 14 , the base body 12 can be fastened to the carrier 14 by actuating a single actuating element 22 . It may also be necessary to actuate two or more actuating elements 22 in order to clamp the base body 12 or 13 on the carrier 14.

The first base body 12 and the second base body 13 of a common workpiece clamping device 11 are arranged in a clamping direction R with a defined base body distance x from one another. The first base body 12 has a contact surface on the side facing the second base body 13 , which can be a first contact surface 27 or a second contact surface 28 . The second base body 13 also has a contact surface on the side facing the first base body 12 , which in turn can also be formed by a first contact surface 27 or a second contact surface 28 . The mutually facing first contact surfaces 27 or second contact surfaces 28 extend parallel to the center plane M ( figure 7 ), which is perpendicular to the span direction R. The base body distance x is defined between the two first contact surfaces 27 or second contact surfaces 28 facing one another. The center plane M is arranged centrally between the contact surfaces facing one another.

Both on the first base body 12 and on A separate closing part 29 is arranged on the second base body 13 . Each terminating part 29 has a first side 30 and a second side 31 opposite the first side 30 . The terminating part 29 has the first contact surface 27 on the first side 30 . On the first side 30 the termination part 29 also has a first attachment surface 32 which is arranged adjacent to the first contact surface 27 . The closing part 29 has the second contact surface 28 on the second side 31 . On the second side 31 the closing part 29 also has a second attachment surface 33 which is arranged adjacent to the second contact surface 28 .

At the in the Figures 4-6 In the exemplary embodiment illustrated, the second contact surface 28 is arranged offset in the clamping direction R with respect to the second attachment surface 33 and, for example, is separated by a step 34 . On the first side 30, the first contact surface 27 and the first attachment surface 32 extend in the same plane according to the example.

The first contact surface 27, the second contact surface 28, the first attachment surface 32 and the second attachment surface 33 are preferably designed as flat surfaces and extend parallel to one another and, in the assembled state, parallel to the central plane M. The first contact surface 27 has a first spacing in the clamping direction R d1 from the second attachment surface 33. The second contact surface 28 has a second distance d2 from the first attachment surface 32 in the clamping direction R. The distances are shown schematically in FIG figure 5 illustrated.

The first attachment surface 32 and the second attachment surface 33 are each set up to lie against a mounting surface 35 of the first base body 12 or the second base body 13 in order to detachably attach the closing part 29 to the first base body 12 or to the second base body 13, for example by means of a screw connection. To produce the screw connection, a plurality of screws and, for example, two screws 36 can be used, as is shown schematically in FIGS Figures 4-6 is illustrated. The closing part 29 can thus be arranged in two different positions or orientations on the mounting surface 35 by resting against the mounting surface 35 either with the first attachment surface 32 or with the second attachment surface 33 ( Figures 5 and 6 ). In figure 4 is a schematic sectional view along the mounting surface 35 with a view of the closing part 29, wherein the closing part 29 rests with the second attachment surface 33 on the mounting surface 35, so that the first side 30 of the closing part 29 is separated from the mounting surface 35 or the associated first base body 12 or second body 13 points away.

The closing part 29 has a recess 38 on the side facing away from the carrier 14 . The recess 38 is open in a vertical direction H, which is oriented at right angles to the clamping direction R and at right angles to the carrier surface 15 . A threaded spindle 39 of the workpiece clamping device 11 can protrude in the clamping direction R into this recess 38 .

In the exemplary embodiment, the recess 38 is limited by a boundary surface 40 in the shape of a circular arc. In the fully assembled state, the boundary surface 40 of the threaded spindle 39 forms an intermediate space opposite to. Alternatively, the boundary surface 40 could be in contact with the peripheral surface of the threaded spindle 39 at least in sections. When replacing clamping bodies, the boundary surfaces 40 of the end parts 29 can be used as storage surfaces for the threaded spindle 39.

The threaded spindle 39 of the workpiece clamping device 11 extends in the clamping direction R along the first base body 12 and along the second base body 13. The threaded spindle 39 has a first threaded section 41 in the area of the first base body 12 and a second threaded section 42 in the area of the second base body 13 first threaded section 41 has an opposite sense of rotation compared to second threaded section 42, with the slope being of the same amount.

A first clamping body 45 is slidably mounted in the clamping direction R on the first base body 12 . A second clamping body 46 is slidably mounted in the clamping direction R on the second base body 13 . A clamping surface or holding surface for acting on a workpiece to be clamped can be present on each clamping body 45 . Alternatively or additionally, a connecting device for arranging a separate clamping jaw can be present on the clamping body 45, 46, which in turn has a clamping surface or holding surface for loading the workpiece.

The first clamping body 45 is in engagement with the first threaded section 41 via a counter-thread, not shown. The second clamping body 46 is in engagement with the second threaded section 42, via a counter-thread, not shown. When the threaded spindle rotates The clamping bodies 45, 46 move around their spindle longitudinal axis towards or away from one another, depending on the direction of rotation of the threaded spindle 39. The first clamping body 45 covers the same path relative to the first base body 12 as the second clamping body 46 does relative to the second base body 13. This movement of the clamping bodies 45, 46 allows a workpiece to be clamped or released.

The threaded spindle 39 is supported exclusively or mainly via the clamping bodies 45, 46 and the base bodies 12, 13 on the carrier 14. As mentioned, when the clamping bodies are replaced or removed, the threaded spindle 39 can be placed on the boundary surfaces 40 of the end parts 29 and is thus roughly pre-positioned for the renewed arrangement of clamping bodies 45, 46 on the base bodies 12, 13.

In order to ensure that the workpiece is clamped centered in relation to the center plane M, the threaded spindle 39 must be centered in the clamping direction R. For this purpose, the threaded spindle 39 has a centering body 47 which has a first centering surface 48 facing the first base body 12 and a second centering surface 49 facing the second base body 13 . The centering surfaces 48, 49 are in particular in figure 7 to recognize. The centering surfaces 48, 49 can extend parallel to one another and, in particular, at right angles to the clamping direction R. The first centering surface 48 rests against the contact surface 27 or 28 of the closing part 29 arranged on the first base body 12 . The second centering surface 49 rests against the contact surface 27 or 28 of the closing part 29 attached to the second base body 13 . Either are the two first contact surfaces 27 of the closing parts 29 face the centering body 47 or, alternatively, the two second contact surfaces 28 face the centering body 47 . Due to the contact of the first contact surfaces 27 or the second contact surfaces 28 on the associated centering surface 48 or 49, the centering body 47 is positioned precisely between the two end parts 29 in the clamping direction R and thereby defines the position of the central plane M. The central plane M runs in Clamping direction R in the middle between the first centering surface 48 and the second centering surface 49 through the centering body 47.

In order to compensate for tolerances when arranging the base bodies 12, 13 on the carrier 14, the closing parts 29 in the preferred exemplary embodiment described here can be attached in different orientations to the respectively assigned base body 12, 13. If the distance between the mounting surfaces 35 of the two base bodies 12, 13 varies in the clamping direction R due to mounting tolerances in different mounting positions on the carrier 14, the end parts 29 can be mounted in the appropriate orientation so that the centering body 47 is in contact with the respective contact surfaces 27 or 28, but on the other hand is not subjected to too high a clamping force in order not to impede the rotation of the threaded spindle 39 and to avoid excessive wear. This compensation is made possible by the fact that the first contact surfaces 27 each have a first distance d1 from the associated mounting surface 35 when they face the centering body 47 and the second contact surfaces 28 each have a second distance d2 from the associated mounting surface 35 when they face the centering body 47 are facing.

In a modification to the exemplary embodiment described, it is not absolutely necessary for each closing part 29 to provide different distances d1, d2 and/or to be able to be attached to a mounting surface 35 in different orientations. The closing part 29 can also be plate-shaped, with it having parallel surfaces on both sides and thus providing or would provide the same spacing between the centering body 47 and the contact surfaces 27, 28 in both orientations. It is also possible to provide end parts 29 with different dimensions in the form of a modular system, so that the end parts 29 with the appropriate dimensions can be selected. If tolerance compensation or play compensation in the clamping direction R is not required, a single type of end part 29 with a single contact surface and a single attachment surface is sufficient.

like it in figure 7 is illustrated, the threaded spindle 39 can be constructed in several parts. In the exemplary embodiment, the threaded spindle 39 has a first spindle part 50 with the first threaded section 41 and a second spindle part 52 with the second threaded section 42. In the clamping direction R, the threaded sections 41, 42 end at a distance from the respective end part 29. Following the threaded sections 41, 42 each spindle part 50, 51 has an end section 52. The end section 52 can have an external thread, at least in one area, which is designed to be screwed into a corresponding internal thread of the centering body 47. The end portion 52 may also be stepped with different diameters to form an annular surface that acts as a stop is used and can interact with a corresponding counter-stop surface on or in the centering body 47 . The relative position of each spindle part 50, 51 relative to the centering body 47 in the clamping direction R can be set very precisely by the stop and the counter-stop. In the exemplary embodiment, each spindle part 50, 51 is connected to the centering body 47 by means of an adhesion-promoting connection in addition to the screw connection.

Since the centering body 47 has, for example, hollow-cylindrical sections or is designed as a hollow cylinder, it forms a centering sleeve.

In the Figures 1-3 different arrangements 10 are illustrated, which can be constructed by means of a workpiece clamping device 11 described above. At the in the figures 1 and 2 In the exemplary embodiments illustrated, two workpiece clamping devices 11 are arranged next to one another in such a way that their threaded spindles 39 extend parallel to one another in a longitudinal direction L and are spaced apart from one another in a transverse direction Q, which is perpendicular to the longitudinal direction L. The centering takes place in such a way that the two centering bodies 47 are arranged centrally or symmetrically relative to a common center plane M.

In the arrangement 10 according to figure 3 the threaded spindles 39 of the two workpiece clamping devices 11 are arranged crossed to form a crossing point 55 . The threaded spindles 39 are offset in the vertical direction H to one another. One threaded spindle extends in the longitudinal direction L and the other threaded spindle extends at right angles thereto in the transverse direction Q. In the exemplary embodiment the arrangement is such that the center plane M defined by the one centering body 47 runs along the longitudinal axis of the spindle of the respective other threaded spindle.

figure 8 shows another embodiment of a workpiece clamping device 11. In the illustration, the base body 12, 13 are not connected to the carrier 14 and illustrated in a kind of exploded view. The structure of the workpiece clamping device 11 corresponds to one of the exemplary embodiments described above, with the difference that each base body 12, 13 is not formed from a single, integral body, but rather has a plurality of base body parts. In the exemplary embodiments shown here, the base bodies 12 , 13 each have a first base body part 56 and a second base body part 57 . In the longitudinal direction L or in the clamping direction R, the two base body parts 56, 57 are in particular of different lengths. By combining base body parts 56, 57 of different lengths, different total lengths of the workpiece clamping device 11 can be provided, for example in the manner of a modular system, depending on the dimensions of the workpieces to be clamped. For example, the second base body part 57 can have at most or exactly half the length in the longitudinal direction L as the first base body part 56.

At the connection point between the two base body parts 56, 57, there is preferably a coupling device 58 in order to couple the two base body parts 56, 57 to one another and to align them relative to one another at least in one spatial direction, so that along the two base body parts 56, 57 precise guidance for the respective clamping body 45, 46 is provided. Adjacent to the coupling device 58, the two base body parts 56, 57 rest against one another with the surfaces facing one another at the connection point.

In the exemplary embodiment, the coupling device 58 can have at least one coupling body 59 which protrudes in the longitudinal direction L or clamping direction R away from one of the base body parts 56, 57 and engages in an associated coupling recess 60 on the respective other base body part 57 or 56. Due to the precise dimensioning of the coupling body 59 with the coupling recess 60, the two base body parts 56, 57 can be precisely aligned relative to one another ( Figures 9 and 10 ).

As it is particularly in figure 10 As can be seen, the at least one coupling body 59 is screwed to one of the base body parts, for example on the first base body part 56, and can alternatively also be fastened by other means. In the transverse direction Q, the outer dimension of the coupling body 59 is dimensioned such that it corresponds to the inner dimension of the coupling recess 60 in the transverse direction Q, apart from a technically required play. This achieves an exact positioning of the two base body parts 56, 57 in the transverse direction Q relative to one another. In the longitudinal direction L and/or in a vertical direction perpendicular to the longitudinal direction L and to the transverse direction Q, there is play between the at least one coupling body 59 and the associated coupling recess 60. Overdetermination can thereby be avoided.

Due to the smaller dimensioning of the second Base body part 57, the second base body part 57 has fewer fastening pins 17 than the first base body part 56. In particular, the first base body part 56 has at least four and, for example, exactly four fastening pins, while the second base body part 57 has fewer than four and, for example, two fastening pins 17. As a result, the exact positioning of the second base body part 57 by means of the fastening device 16 on the carrier 14 is not always guaranteed and the orientation of the two base body parts 56, 57 is additionally specified by the coupling device 58, at least in the transverse direction Q.

As it is particularly in figure 8 As can be seen, in all of the above-described exemplary embodiments of the workpiece clamping device 11, a connecting body 61 can be present, which connects the two base bodies 12, 13 to one another and can bridge a gap between the two base bodies 12, 13. The connecting body 61 is arranged at a distance from the carrier 14 and is not in contact with the carrier 14 or is not attached directly to the carrier 14 . The connecting body 61 can form a cover and cover the centering body 47 and/or the closing parts 29 .

For this purpose, each base body 12, 13 in the region of the end which has the mounting surface 35, can have several and, for example, two fastening openings 62, for example threaded holes 63 ( Figures 1-3 ). A fastening pin 64 which is connected to the connecting body 61 can engage in the fastening openings 62 in order to fasten the connecting body 61 to the first base body 12 or to the second base body 13 . In the example each fastening pin 64 is formed by a fastening screw 65 which engages in the thread of the threaded bore 63, so that the connecting body 61 is attached both to the first base body 12 and to the second base body 13 by a screw connection.

In particular, the connecting body 61 serves to connect the two base bodies 12, 13 and has no guiding function for positioning the centering body 47. According to the example, the centering body 47 is positioned exclusively through and between the closing parts 29 .

The aspect of the construction of the base bodies 12, 13 from a plurality of base body parts 56, 57 and their coupling with a coupling device 58 and/or the aspect of the connection of the two base bodies 12, 13 by means of a separate connecting body 61 can also be carried out independently of other described configurations of the workpiece clamping device 11 are used and thus represent separate, independent aspects of the invention.

The invention relates to a workpiece clamping device 11 with a first base body 12 on which a first clamping body 45 is mounted so that it can be displaced in a clamping direction R, and with a second base body 13 on which a second clamping body 46 is mounted so that it can be displaced in the clamping direction R. The two clamping bodies 45, 46 are in engagement with a threaded spindle 39. A contact surface 27 or 28 is arranged on each base body 12, 13 on the side facing the other base body 13 or 12, respectively. In the clamping direction R, the contact surfaces are arranged to form a base body distance x. A centering body 47 of the threaded spindle 39 has centering surfaces 48, 49 which each rest against an associated contact surface 27 or 28 in order to position the threaded spindle in the clamping direction R with as little play as possible.

Reference list:

10

arrangement

11

workpiece clamping device

12

first body

13

second body

14

carrier

15

carrier surface

16

fastening device

17

mounting pin

18

Hole

19

slider

20

channel

21

mounting groove

22

actuator

27

first contact surface

28

second contact surface

29

final part

30

first page of the final part

31

second page of the final part

32

first mounting surface

33

second mounting surface

34

Step

35

mounting surface

38

recess

39

lead screw

40

boundary surface

41

first thread section

42

second thread section

45

first clamp body

46

second clamping body

47

centering body

48

first centering surface

49

second centering surface

50

first spindle part

51

second spindle part

52

end section

55

crossing point

56

first body part

57

second body part

58

coupling device

59

coupling body

60

coupling recess

61

connecting body

62

mounting hole

63

threaded hole

64

mounting pin

65

mounting screw

x

body spacing

d1

first distance

d2

second distance

H

height direction

L

longitudinal direction

M

midplane

Q

transverse direction

R

clamping direction

Claims (15)

1. Workpiece clamping device (11) comprising

   a first base body (12) and a second base body (13), wherein a contact surface (27 or 28) is arranged on each base body (12, 13) on the face of each base body (12, 13) facing the respective other base body (13 or 12), wherein a base body distance (x) is defined between the contact surfaces (27 or 28) in a clamping direction (R),

   a first clamping body (45) that is movably supported on the base body (12) in clamping direction (R), a second clamping body (46) that is movably supported on the second base body (13) in clamping direction (R),

   a threaded spindle (39) extending in clamping direction (R) and having a first thread section (41) that is in engagement with a counter-thread on the first clamping body (45) and having a second thread section (42) that is in engagement with a counter-thread on the second clamping body (46), wherein the threaded spindle (39) comprises a centering body (47) arranged between the first thread section (41) and the second thread section (42) and abutting against the contact surfaces (27 or 28) facing each other.
2. Workpiece clamping device according to claim 1, characterized in that each base body (12, 13) comprises a terminal part (29) on which the contact surface (27 or 28) is arranged.
3. Workpiece clamping device according to claim 2, characterized in that the terminal parts (29) are separate from the base bodies (12, 13).
4. Workpiece clamping device according to claim 3, characterized in that each terminal part (29) is releasably attached to the assigned base body (12, 13).
5. Workpiece clamping device according to claim 4, characterized in that each terminal part (29) comprises a first contact surface (27) on a first side (30) and a second contact surface (28) on a second side (31) opposite the first side (30).
6. Workpiece clamping device according to claim 5, characterized in that each terminal part (29) comprises a first attachment surface (32) on the first side (30) and a second attachment surface (33) on the second side (31) .
7. Workpiece clamping device according to claim 6, characterized in that the first contact surface (27) and the second attachment surface (33) have a first distance (d1) from each other in clamping direction (R) and that the second contact surface (28) and the first attachment surface (32) have a second distance (d2) from each other in clamping direction (R), wherein the second distance (d2) is different from the first distance (d1).
8. Workpiece clamping device according to claim 7, characterized in that each terminal part (29) comprises a step (34) on the second side (31) that separates the second attachment surface (33) from the second contact surface (28) .
9. Workpiece clamping device according to any of the claims 6 to 8, characterized in that the terminal part (29) is attached to the assigned base body (12, 13) either with the first attachment surface (32) or with the second attachment surface (33).
10. Workpiece clamping device according to any of the claims 2 to 9, characterized in that each terminal part (29) comprises a limiting surface (40) that is arranged opposite the threaded spindle (39).
11. Workpiece clamping device according to any of the preceding claims, characterized in that the threaded spindle (39) comprises a first spindle part (50) having the first thread section (41) and a second spindle part (51) having the second thread section (42).
12. Workpiece clamping device according to claim 11, characterized in that the first spindle part (50) and the second spindle part (51) are connected with each other by means of the centering body (47).
13. Arrangement (10) comprising at least two workpiece clamping devices (11) according to one of the preceding claims, wherein the threaded spindles (39) extend parallel to one another in a longitudinal direction (L) and wherein the two centering bodies (47) are centrally arranged with regard to a common center plane (M) that is orientated orthogonal to the longitudinal direction (L).
14. Arrangement (10) comprising at least two workpiece clamping devices (11) according to any of the preceding claims, wherein one of the threaded spindles (39) extends in a longitudinal direction (L) and another of the threaded spindles (39) extends in a transverse direction (Q) orientated orthogonal to the longitudinal direction (L) such that the threaded spindles (39) cross each other.
15. Arrangement according to claim 14, characterized in that the centering body (47) of the one threaded spindle (39) is arranged symmetrically to a center plane (M) that extends along the spindle longitudinal axis of the other threaded spindle (39).

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