DE102021110001B3 - Device for fastening a workpiece with two displaceable and/or rotatable linear guide elements, clamping system, test bench and use of such a test bench - Google Patents

Abstract

The invention relates to a device (10) for fastening a workpiece (11) to a clamping plate (12) with mounting holes (12b), comprising a base (13) which can be anchored in two of the mounting holes and a first linear guide element (131) comprises; - a cross element (14); - a carriage (15) comprising a second linear guide element (151); - a fixing unit (16) for releasably fixing the carriage relative to the base; - a column (17) comprising a a lower and an upper end portion (17u, 17o);- a holding unit (18) for holding the workpiece; wherein- the cross element is coupled to the first linear guide element in such a way that the cross element can be moved relative to the base along the first linear guide element;- the cross element is coupled to the second linear guide element in such a way that the carriage can be moved relative to the cross element along the second linear guide element - the column is attached to the carriage with its lower end area; - the holding unit is attached to the upper end area of the column.The invention also relates to a clamping system (21) with such a device, a test stand (20) with such a device Clamping system and use of such a test stand.

Description

The present invention relates to a device for attaching a workpiece to a clamping plate with mounting holes, a clamping system with such a device, a test bench with such a clamping system and the use of such a test bench.

DE 38 01 813 A1 discloses a device for clamping workpieces for measuring tasks with a number of clamping elements to be fastened to a carrier plate. The carrier plate is a perforated plate that contains a grid of a large number of regularly arranged threaded holes. The clamping elements each comprise a foot that is longitudinally adjustable and movable relative to the mounting grid on the carrier plate, a height-adjustable column that builds on it, a workpiece carrier that is rotatably attached to the column, and a clamping part that is also rotatable and height-adjustable relative to the workpiece carrier. The foot has a slot. The foot is mounted on the support plate with a screw.

WO 94/01242 A1 discloses an intermediate element for clamping devices for clamping workpieces on a breadboard, which consists of a base plate, a transverse displacement element, a longitudinal displacement element, an intermediate plate and a locking means in the form of a nut. The base plate has two holes in the spacing of the grid of the grid plate and a laterally offset first T-slot, which serves to accommodate the transverse sliding element. A second T-groove running perpendicular to the first T-groove is arranged in the transverse displacement element and serves to receive a foot of the longitudinal displacement element, which has the shape of a T-nut. The intermediate plate rests on the base plate. The longitudinal displacement element is a bolt body on which the foot is integrally formed. The upper end of the bolt body is provided with a locking thread onto which the nut can be screwed. The intermediate plate has a cylindrical bushing corresponding to the outer diameter of the bolt body, so that the base plate, the transverse displacement element, the longitudinal displacement element and the intermediate plate can be non-positively connected to one another in different displacement positions by means of the nut.

DE 94 02 277 U1 discloses a support rail as a link between a machine tool table with T-slots and a component. A groove is attached to the underside of the rail, in which a diameter of a screw head is movable along the entire length of the rail. The rail is firmly fixed in a mounting hole of the machine tool table by means of a screw. The fixing screw is in a slot nut that sits in one of the T-slots of the machine tool table and can be moved in the slot when not fastened. A T-groove is made in the upper side of the support rail, in which the component is fastened in a sliding block with a screw. The fixing screw and the slot nut are pivotally connected to each other.

DE 10 2016 007 114 A1 discloses a device for the variable and guided positioning of an object carrier, with a base plate, a first carriage that can be moved thereon in a guided manner in a first horizontal direction, and a second carriage that can be moved on the first carriage in a second horizontal direction perpendicular to the first direction . The base plate has a guide groove for the first carriage. The first carriage has a guide groove for the second carriage on its upper side. A central bore is provided in the top of the carriage in which an attachment can be centered with an underside pin which can then be rotated relative to the carriage.

The object of the invention is to provide a device for attaching a workpiece to a clamping plate with assembly bores which enables flexible, simple, stable and precise adaptation even to complex workpiece geometries.

Against this background, the invention proposes the subject matter of the independent claims. Advantageous embodiments of the invention are described in the dependent claims.

• - einen Sockel, der in wenigstens zwei der Montagebohrungen verankert werden kann und genau oder wenigstens ein erstes Linearführungselement umfasst;
• - genau oder wenigstens ein Kreuzelement;
• - genau oder wenigstens einen Schlitten, der genau oder wenigstens ein zweites Linearführungselement umfasst;
• - genau oder wenigstens eine Fixiereinheit zum lösbaren Fixieren des Schlittens relativ zu dem Sockel;
• - genau oder wenigstens eine Säule, die einen unteren und einen oberen Endbereich aufweist; und
• - genau oder wenigstens eine Halteeinheit zum Halten des Werkstücks;

wobei

• - jedes Kreuzelement an wenigstens eines der ersten Linearführungselemente derart gekoppelt ist, dass das Kreuzelement relativ zu dem Sockel längs des erstens Linearführungselements verfahren oder verschoben oder bewegt werden kann;
• - das Kreuzelement an das zweite Linearführungselement derart gekoppelt ist, dass der Schlitten relativ zu dem Kreuzelement längs des zweiten Linearführungselements verfahren oder verschoben oder bewegt werden kann;
• - die Säule mit ihrem unteren Endbereich an dem Schlitten angebracht oder befestigt oder verstellbar angebracht ist;
• - die Halteeinheit an dem oberen Endbereich der Säule angebracht oder befestigt oder verstellbar angebracht ist;
• - das Kreuzelement ein erstes und ein zweites Führungsteil umfasst, die schwenkbar miteinander verbunden sind,
• - die Kopplung des Kreuzelements an das erste Linearführungselement mit Hilfe des ersten Führungsteils bewirkt ist;
• - die Kopplung des Kreuzelements an das zweite Linearführungselement mit Hilfe des zweiten Führungsteils bewirkt ist;
• - die Fixiereinheit eine Fixierschraube umfasst; und
• - die Fixierschraube mit einem ersten Abschnitt an dem ersten Führungsteil und mit einem zweiten Abschnitt an dem zweiten Führungsteil derart angreift, dass der Sockel und der Schlitten zwischen den Führungsteilen eingespannt sind.

According to a first aspect, the invention proposes a device for fastening a workpiece to a clamping plate with mounting bores which are arranged in a precise or at least a predetermined grid

• - A base that can be anchored in at least two of the mounting holes and comprises at least one first linear guide element;
• - exactly or at least one cross element;
• - Exactly or at least one carriage, which comprises exactly or at least one second linear guide element;
• - Precisely or at least one fixing unit for releasably fixing the carriage relative to the base;
• - exactly or at least one column having a lower and an upper end portion; and
• - Precisely or at least one holding unit for holding the workpiece;

whereby

• - Each cross element is coupled to at least one of the first linear guide elements in such a way that the cross element can be moved or displaced or moved relative to the base along the first linear guide element;
• - The cross element is coupled to the second linear guide element in such a way that the carriage can be moved or displaced or moved relative to the cross element along the second linear guide element;
• - the column is attached or fixed or adjustably attached with its lower end portion to the carriage;
• - the holding unit is attached or fastened or adjustably attached to the upper end region of the column;
• - the cross element comprises a first and a second guide part which are pivotally connected to each other,
• - the coupling of the cross element to the first linear guide element is effected with the aid of the first guide part;
• - the coupling of the cross element to the second linear guide element is effected with the aid of the second guide part;
• - the fixing unit comprises a fixing screw; and
• - The fixing screw engages with a first section on the first guide part and with a second section on the second guide part in such a way that the base and the carriage are clamped between the guide parts.

• - genau oder wenigstens eine Aufspannplatte mit Montagebohrungen, die in genau oder wenigstens einem vorbestimmten Raster angeordnet sind;
• - genau oder wenigstens eine Vorrichtung, die gemäß dem ersten Aspekt ausgebildet ist;

wobei

• - der Sockel jeder Vorrichtung in wenigstens zwei der Montagebohrungen verankert ist.

According to a second aspect, the invention proposes a clamping system comprising

• - Exactly or at least one clamping plate with mounting holes, which are arranged in exactly or at least a predetermined grid;
• - exactly or at least one device designed according to the first aspect;

whereby

• - the base of each device is anchored in at least two of the mounting holes.

• - genau oder wenigstens ein Aufspannsystem, das gemäß dem zweiten Aspekt ausgebildet ist;
• - genau oder wenigstens eine Messeinrichtung zum Messen eines Werkstücks, das mit Hilfe wenigstens einer der Vorrichtungen an der Aufspannplatte befestigt ist.

According to a third aspect, the invention proposes a test bench, comprising

• - exactly or at least one clamping system, which is designed according to the second aspect;
• - precisely or at least one measuring device for measuring a workpiece which is fastened to the platen by means of at least one of the devices.

According to a fourth aspect, the invention proposes the use of a test bench designed according to the third aspect, the test bench being used in the end-of-line testing of body parts of a motor vehicle, aircraft or ship.

The invention allows a flexible, simple, stable and precise adjustment to complex workpiece geometries.

The proposed device can be designed in any way as required, for example in such a way that it has no additional or at least one additional base and/or no additional or at least one additional cross element and/or no additional or at least one additional carriage and/or no additional or at least one additional fixing unit and/or no additional or at least one additional column and/or no additional or at least one additional holding unit.

The proposed device is used in particular when measuring, checking and testing workpieces. In the context of the present invention, a workpiece is defined as a single, coherent object that has already been completed or is to be further processed manually or mechanically. A workpiece can be a single component or can be an assembly of coherent, mechanically connected components; it is essential that the workpiece is as solid and spatially stable as possible, so that the workpiece can be clamped using the device. The workpiece is held in a predetermined position by means of the device, so that, for example, precise measurement and/or testing of the workpiece is made possible. The measurement and/or testing relates, for example, to the thickness of a wall of the workpiece or the position of a first section of the workpiece relative to a second section of the workpiece.

The backing plate is illustratively a substantially planar, substantially rectangular plate having a length and a width each defining an opposite side of the plate. The platen has a top surface and a bottom surface, each defined as an area subtended by the length and width of the platen, with the bottom surface facing the top surface. The top surface faces the clamped workpiece. A thickness of the platen corresponds to the distance between the top and bottom surfaces. The clamping plate has a plurality of mounting holes for mounting the device, the mounting holes being arranged in at least one predetermined grid. The mounting hole pattern is defined as a regular pattern of mounting holes. A grid width of the grid describes the distance between two adjacent mounting holes in the direction of one side of the board. The size of the mounting holes depends on the type and size of the fasteners that are intended for mounting the device on the clamping plate. The clamping plate preferably has a grid. The mounting holes preferably have an internal thread.

Each base is preferably a separate component of the device and can be attached to the platen. The base can be formed in any manner as required, for example such that it has a central region, a first end region and a second end region, with the central region being arranged between the first and second end regions and connecting these end regions to one another. Each end portion includes means for anchoring in just one or at least one of the mounting holes. Each end area preferably has exactly or at least one through hole for passing through a fastening screw. The base can be arranged and attached to the clamping plate in such a way that exactly or at least two of these through-holes or all of these through-holes are aligned with one of the mounting holes. The distance between a through hole and at least one other through hole preferably corresponds to a grid width or a multiple of a grid width. More preferably, the distance between a through hole and at least one other through hole corresponds to the distance between two grid points that lie in a diagonal direction of the clamping plate, or a multiple of this distance.

The first linear guide element is formed, for example, in the middle area of the base and, for example, comprises an essentially rectilinear recess which, for example, has the shape of a slit or a gap or a slot or a groove and runs over at least part of the length of the middle area, wherein this length is defined as the shortest distance between the first and second end portions. The base can be designed in any way as required, for example in such a way that it comprises no additional or at least one additional linear guide element.

Each carriage is preferably a separate component of the device and can be attached or fixed to the base. The carriage can be formed in any manner as required, for example such that it has a middle section, a first end section and a second end section, with the middle section being arranged between the first and second end sections and connecting these end sections to one another.

The second linear guide element is formed, for example, in the middle area of the carriage and comprises, for example, an essentially rectilinear recess which, for example, has the shape of a slit or a gap or a slot or a groove and runs over at least part of the length of the middle area, wherein this length is defined as the shortest distance between the first and second end portions. The carriage can be designed in any way as required, for example in such a way that it comprises no additional or at least one additional linear guide element. Preferably, the carriage has at least one of its end regions exactly or at least one support which extends from on a surface facing the platen towards the platen. The supports act as stabilizing components of the carriage and are preferably adjustable in height.

Each cross element is preferably a separate component of the device and enables guided adjustment and movement of the carriage relative to the base. The cross element is preferably guided or slidably and/or rotatably arranged or slidably and/or rotatably mounted both on the first linear guide element and on the second linear guide element. The base and the carriage cross in the exact area where the cross element is located. The cross member is preferably coupled to the base such that the base can be rotated or pivoted about the cross member. The cross member is preferably coupled to the carriage such that the base can be rotated or pivoted about the cross member.

Each fixing unit is preferably a separate component of the device and, in the fixed state, in which it fixes the carriage relative to the base, enables the position of the carriage to be adjusted relative is fixed to the pedestal. The fixing can be done in any way as required, for example by force-fitting and/or form-fitting connection and/or by clamping and/or screwing and/or wedging and/or bracing. The fixing unit preferably acts on the cross element and on the base.

Preferably, the device comprises an adjustment unit for the carriage and the base has in its central region an exactly or at least substantially rectilinear adjustment recess designed in such a way that the adjustment unit can engage in it and interact with the carriage. Each adjustment recess has, for example, the shape of a slit or a gap or a slot or a groove and runs, for example, over at least part of the length of the central area and preferably parallel to the first linear guide element. Preferably, the adjustment unit comprises precisely or at least one adjustment element, which is guided in one of the adjustment recesses or is arranged in a displaceable and/or rotatable manner or is mounted in a displaceable and/or rotatable manner and which is designed in such a way that it interacts with the carriage or rests against the carriage can. Each adjusting element comprises, for example, an adjusting screw with a screw head and an adjusting nut, the adjusting screw protruding through the respective adjusting recess and being able to be fixed to the base by means of the adjusting nut in such a way that the screw head and/or the adjusting nut rests on one side of the carriage.

Each column can be designed in any way as required, for example adjustable in height and/or such that it is attached or fastened to the first or second end region of the carriage. For example, the column has, at least in part, a substantially circular or square cross-section. The column is preferably mounted or secured to the carriage such that it extends perpendicularly to the top surface of the platen and/or so that together with the carriage it forms a substantially L-shaped member. The column can be a separate component, but it can also form a one-piece component together with the carriage.

Each holding unit is preferably designed in such a way that it interacts directly or indirectly with the workpiece and in particular bears against the workpiece and/or grips the workpiece. The holding unit preferably serves as a connecting component between the column and the workpiece. The holding unit can be a separate component, but it can also form a one-piece component together with the column or together with the column and the carriage, so that the column is expanded at its upper end region with the holding unit. If the holding unit is a separate component, it can be or can be fastened to the column with fastening means. The holding unit is preferably attached to the column so that it can be adjusted in such a way that it can be adjusted with respect to at least one degree of freedom.

In the invention it is specified that the cross element comprises a first and a second guide part which are pivotally connected to one another, the coupling of the cross element to the first linear guide element being effected or taking place with the aid of the first guide part and the coupling of the cross element to the second linear guide element is effected or takes place with the aid of the second guide part. The first guide part is preferably guided or slidably and/or rotatably arranged or slidably and/or rotatably mounted on the first linear guide element and preferably engages in the recess of the first linear guide element, and the second guide part is guided or slidable and/or on the second linear guide element arranged rotatably or mounted displaceably and/or rotatably and preferably engages in the recess of the second linear guide element. Due to the pivotable connection of the guide parts to one another, the base and the carriage are also pivotably connected to one another.

The invention specifies that the fixing unit comprises a fixing screw, the fixing screw engaging with a first section on the first guide part and with a second section on the second guide part in such a way that the base and the carriage are clamped between the guide parts and also the Guide parts are set to each other. The pivotable connection of the guide parts is preferably effected by the fixing screw. The fixing screw preferably has a threaded shank, which forms the first section and is screwed into a threaded bore of the first guide part, and a screw head, which forms the second section and is supported on the second guide part. Then, by tightening the fixing screw in the first guide part, the guide parts and thus also the base and the carriage can be pressed together and braced against one another.

In one embodiment of the invention it is specified that the holding unit comprises an abutment element for abutting against the workpiece and a bracket, the abutment element being attached or attached or adjustably attached to the bracket and the bracket attached or attached or adjustable to the upper end portion of the column is attached.

In an embodiment of the invention it is specified that the holding unit comprises a tensioning unit with a pressure element, the tensioning unit being attached or fastened or adjustably attached to the holder such that the pressure element can be pressed against the abutment element.

In one embodiment of the invention it is specified that the column is designed as a telescopic column. Within the meaning of the present invention, a telescopic column is defined as a column whose height can be adjusted.

In one embodiment of the invention it is specified that an angle α between the first and the second linear guide element is greater than 0° and less than 180°. A longitudinal axis A is preferably assigned to the first linear guide element and a longitudinal axis B to the second linear guide element, with the longitudinal axes A and B crossing at a point K of intersection. The vertex P of the angle α lies in this point of intersection K and the angle α is delimited by the longitudinal axes A and B.

Each measuring device can be designed in any way as required, for example as a 2D or 3D laser scanner and/or such that it measures the thickness of a wall of the workpiece and/or the position of a first section of the workpiece relative to a second section of the workpiece can.

In the context of the present invention, the use of the term "approximately" in relation to a value or value range means a tolerance range that a person skilled in the art considers normal for this value or value range and which is in particular ±10%, preferably ±5% and more preferably ±2%, and the use of the term "substantially" in relation to a property means a tolerance range that is economically and technically justifiable for the person skilled in the art insofar as this property is still recognizable as such.

In the following, embodiments of the invention are explained in more detail by way of example with reference to the accompanying drawings. However, the resulting individual features are not limited to the individual embodiments, but can be connected and/or combined with individual features described above and/or with individual features of other embodiments.

• 1 eine perspektivische Ansicht einer bevorzugten Ausführungsform einer Vorrichtung zum Befestigen eines Werkstücks an einer Aufspannplatte;
• 2 die Draufsicht zu 1;
• 3 eine Schnittansicht längs der Linie A-A aus 2;
• 4 eine perspektivische Ansicht einer bevorzugten Ausführungsform eines Prüfstands und eines Werkstücks, wobei der Prüfstand ein Aufspannsystem umfasst, das gemäß einer bevorzugten Ausführungsform ausgebildet ist und die Vorrichtung aus 1 umfasst.

The drawings show in

• 1 a perspective view of a preferred embodiment of a device for attaching a workpiece to a platen;
• 2 the top view too 1 ;
• 3 a sectional view along the line AA 2 ;
• 4 a perspective view of a preferred embodiment of a test stand and a workpiece, wherein the test stand comprises a clamping system, which is designed according to a preferred embodiment and the device 1 includes.

In 1 until 3 is a preferred embodiment of a device 10 according to the invention for fastening a workpiece 11 ( 4 ) on a clamping plate 12 ( 4 ) shown schematically with mounting holes 12b.

The device 10 comprises a base 13 with a first end area 131, a second end area 132 and a middle area 133, the middle area 133 being arranged between the end areas 131, 132 and connecting these end areas 131, 132 to one another. The base 13 includes two mounting screws 13s which can be screwed into the mounting holes 12b, and each end portion 131, 132 has a through hole (not shown) through which one of the mounting screws 13s is passed. Thus, each end portion 131, 132 includes means for anchoring in one of the mounting holes 12b, and the base 13 can be anchored in two mounting holes 12b and thereby attached to the mounting plate 12.

In its central region 133, the base 13 comprises a linear guide element 131, which is also referred to here as the first linear guide element 131, and two straight adjustment recesses 13j. The first linear guide element 131 comprises, for example, a rectilinear recess which has the shape of an elongated hole and runs essentially over the entire length of the middle region 133 . Each adjustment recess 13j has, for example, the shape of an elongated hole and runs essentially over the entire area of central region 133 and parallel to first linear guide element 131.

The device 10 comprises a cross member 14 comprising first and second guide members 141, 142 pivotally connected together. Each guide member 141, 142 has a substantially T-shaped cross-section and has a ridge and two shoulders projecting perpendicularly from the ridge in opposite directions.

The device 10 comprises a carriage 15 with a first end area 151, a second end area 152 and a middle area 153, the middle area 153 being arranged between the end areas 151, 152 and connecting these end areas 151, 152 to one another. The carriage 15 comprises two supports 15s which are attached under its end regions 151, 152 and from there extend to the platen 12 and are supported on this. Thus, the supports 15s act as stabilizing components for the carriage 15.

The carriage 15 comprises a linear guide element 151 in its central region 153, which is also referred to as the second linear guide element 151 here. The second linear guide element 151 comprises, for example, a rectilinear recess which is in the form of an elongated hole and runs essentially over the entire length of the middle region 153 .

The second guide part 142 sits with its web, which is 1 and 3 points downwards, displaceably in the recess of the second linear guide element 151 and lies with its shoulders, which in 1 and 3 to the left or right, on an edge area of the linear guide element 151, which in 1 and 3 pointing up. The first guide part 141 sits in a similar way with its web, which is 1 and 3 points upwards but is not shown, displaceably in the recess of the first linear guide element 131 and lies with its shoulders, which in 1 and 3 pointing forwards or backwards, on an edge area of the linear guide element 131, which in 1 and 3 facing down and in 1 is not shown. In the 1 and 3 forward-facing shoulder is in 3 shown but not in 1 , and the in 1 and 3 back-facing shoulder is in 1 and 3 Not shown. Thus, the cross element 14 is coupled to the first linear guide element 131 by means of the first guide part 141 and to the second linear guide element 151 by means of the second guide part 142 and the cross element 14 enables a guided adjustment and movement of the carriage 15 relative to the base 13. Due to Due to the pivotable connection of the guide parts 141, 142 to one another, the base 13 and the carriage 15 are also pivotably connected to one another.

The device 10 comprises a fixing unit 16 for releasably fixing the carriage 15 relative to the base 13. The fixing unit 16 comprises, for example, a fixing screw 16s with a first section, which is designed as a threaded shank 161, and a second section, which is designed as a screw head 162 is trained. The threaded shaft 161 is passed through a through hole (not shown) formed in the second guide part 142 and through the recesses of the linear guide elements 131, 151 and screwed into a threaded hole (not shown) of the first guide part 141. The screw head 162 is supported on a side of the guide part 142 which is in 1 and 3 points upwards and is also referred to here as the top. By tightening the fixing screw 16s in the guide part 141, the guide parts 141, 142 and thus also the base 13 and the carriage 15 are pressed together and braced against one another. Thus, on the one hand, the fixing screw 16s engages with its first section 161 on the first guide part 141 and with its second section 162 on the second guide part 142 in such a way that the base 13 and the carriage 15 are clamped between the guide parts 141, 142 and also the Guide parts 141, 142 are fixed to each other. Thus, on the other hand, the pivotable connection of the guide parts 141, 142 is effected by the fixing screw 16s when this is not tightened.

The device 10 comprises a column 17 with a lower and an upper end region 17u, 17o. The column 17 is, for example, a telescopic column and is therefore adjustable in height. The column 17 is screwed with its lower end area 17u to the first end area 151 of the carriage 15 directly above the support 15s and is thus attached to the carriage 15 so that it can be replaced.

The device 10 includes a holding unit 18 for holding the workpiece 11. The holding unit 18 includes, for example, a contact element 18a for application to the workpiece 12, a holder 18h and a clamping unit 18s with a pressure element 18d. The contact element 18a is attached to the holder 18h in an exchangeable and height-adjustable manner, and the holder 18h is attached to the upper end region 17o of the column 17 in an exchangeable and adjustable manner in such a way that it can be rotated about a vertical axis. The clamping unit 18s is designed, for example, as a toggle clamp and is attached to the holder 18h in an exchangeable and adjustable manner such that it can be rotated about a vertical axis and displaced along this axis and that the pressure element 18d can be pressed against the contact element 18a.

The device 10 includes an adjusting unit 19 for the carriage 15. The adjusting unit 19 includes four adjusting elements, each of which includes an adjusting screw 19s with a screw head 19k and an adjusting nut 19m. The first adjustment element that is in 1 left front, in 2 bottom left and in 3 shown on the left, protrudes with its adjusting screw 19s through the first adjusting recess 13j, which is 1 front, inside 2 below and in 3 is shown in section, and is detachably fixed to the base 13 by means of its adjusting nut 19m in such a way that its screw head 19k rests against a first side of the carriage 15, which is in 1 until 3 is shown on the left. The cut line 3 runs in the middle of this first adjustment recess 13j. The second adjustment element, which is 1 left rear, in 2 top left and in 3 not shown, protrudes with its adjusting screw 19s through the second adjusting recess 13j, which is 1 behind, inside 2 above and in 3 is not shown, and is detachably fixed by means of its adjusting nut 19m on the base 13 in such a way that its screw head 19k rests against the first side of the carriage 15. The third adjustment element, which is 2 bottom right and in 3 shown on the right, protrudes with its adjusting screw 19s through the first adjusting recess 13j and is detachably fixed to the base 13 by means of its adjusting nut 19m in such a way that its screw head 19k rests on a second side of the carriage 15, which is in 1 until 3 is shown on the right. The fourth adjustment element, which is 2 right above and in 3 is not shown, protrudes with its adjusting screw 19s through the second adjusting recess 13j and is fixed in such a detachable manner by means of its adjusting nut 19m on the base 13 that its screw head 19k rests against the second side of the carriage 15. Thus, on the one hand, each adjustment element is guided in one of the adjustment recesses 13j and arranged so as to be displaceable and rotatable and supported so that it can be displaced and rotated, and is designed in such a way that it can interact with the carriage 15 and rest against the carriage 15 . Thus, on the other hand, each adjustment recess 13j is designed in such a way that the adjustment unit 19 can engage in it and interact with the carriage 15 .

In 4 1 is a preferred embodiment of a test stand 20 and a workpiece 11 to be tested, which is part of a hood of a motor vehicle, for example, is shown schematically. The test bench 20 includes a clamping system 21, which is designed according to a preferred embodiment, and a measuring device 22, which is a 3D laser scanner device, for example.

The clamping system 21 includes five devices 10 and a clamping plate 12 with mounting holes 12b, which are arranged in a square grid with a W grid width. In the case of the device 10 in 4 is shown on the far left, the distance between the through-holes formed in its base 13, in which its fastening screws 13s sit, corresponds to exactly one grid width W. Thus, the base 13 can be arranged and attached to the clamping plate 12 in such a way that these two through-holes and the fastening screws 13s sitting therein are each aligned with one of the mounting holes 12b. On the other hand, in the case of the device 10 shown in 4 is shown on the far right, the distance between the through holes formed in its base 13, in which its fastening screws 13s sit, exactly one diagonal grid width W', for which W'=21/2 ^× W applies. The base 13 can thus be arranged and attached to the clamping plate 12 in such a way that these two through holes and the fastening screws 13s seated therein are each aligned with one of the mounting holes 12b.

Reference List

10

Device for fastening a workpiece to a clamping plate

11

workpiece

12

clamping plate

12b

Mounting holes from 12

13

base

131/132

first/second end range of 13

133

middle range of 13

13y

adjustment recesses of 13

131

Linear guide element of 13, first linear guide element

13s

mounting screws

14

cross element

141/142

first/second guide part of 14

15

Sleds

151/152

first/second end range of 15

153

middle range of 15

151

Linear guide element of 15, second linear guide element

15s

supports from 15

16

fuser unit

16s

Fixing screw of 16

161/162

Threaded shank/screw head from 16s

17

pillar

17o/17u

upper/lower end range of 17

18

holding unit

18a/18d

Abutment element of 18/pressure element of 18s

18h/18s

Bracket/clamping unit from 18

19

adjustment unit

19k

Screw head from 19s

19m/19s

Adjusting nut/adjusting screw from 19

20

test bench

21

clamping system

22

measuring device

Claims (8)

Device (10) for fastening a workpiece (11) to a clamping plate (12) with mounting bores (12b) which are arranged in at least one predetermined grid, comprising - At least one base (13) which can be anchored in at least two of the mounting holes (12b) and comprises at least one first linear guide element (131); - at least one cross element (14); - At least one carriage (15) comprising at least one second linear guide element (151); - At least one fixing unit (16) for releasably fixing the carriage (15) relative to the base (13); - at least one column (17) having a lower and an upper end portion (17u, 17o); - At least one holding unit (18) for holding the workpiece (11); whereby - The cross element (14) is coupled to the first linear guide element (131) in such a way that the cross element (14) can be moved relative to the base (13) along the first linear guide element (131); - The cross element (14) is coupled to the second linear guide element (151) in such a way that the carriage (15) can be moved relative to the cross element (14) along the second linear guide element (151); - the column (17) is attached with its lower end region (17u) to the carriage (15); - the holding unit (18) is attached to the upper end region (170) of the column (17); - the cross member (14) comprises a first and a second guide part (141, 142) which are pivotally connected to each other; - the coupling of the cross element (14) to the first linear guide element (131) is effected with the aid of the first guide part (141); - the coupling of the cross element (14) to the second linear guide element (151) is effected with the aid of the second guide part (142); - the fixing unit (16) comprises a fixing screw (16s); and - the fixing screw (16s) engages with a first section (161) on the first guide part (141) and with a second section (162) on the second guide part (142) in such a way that the base (13) and the carriage (15) are clamped between the guide parts (141, 142). Device (10) according to claim 1 , wherein - the holding unit (18) comprises a contact element (18a) for contacting the workpiece (11) and a holder (18h); - The contact element (18a) is attached to the holder (18h); - the bracket (18h) is attached to the upper end portion (17o) of the column (17). Device (10) according to claim 2 , wherein - the holding unit (18) comprises a clamping unit (18s) with a pressure element (18d); - The clamping unit (18s) is attached to the holder (18h) in such a way that the pressure element (18d) can be pressed against the contact element (18a). Device (10) according to one or more of the preceding claims, wherein - The column (17) is designed as a telescopic column. Device (10) according to one or more of the preceding claims, wherein - an angle between the linear guide elements (131, 151) is greater than 0° and less than 180°. Clamping system (21) comprising - a clamping plate (12) with mounting holes (12b) which are arranged in at least one predetermined grid; - At least one device (10) according to one or more of Claims 1 until 5 is trained; - the base (13) of the device (10) being anchored in at least two of the mounting holes (12b). Test stand (20) comprising - at least one clamping system (21) according to claim 6 is trained; - At least one measuring device (22) for measuring a workpiece (11) which is fastened to the clamping plate (12) with the aid of the device (10). Use of a test stand (20) according to claim 7 is trained in the end-of-line testing of body parts (11) of a motor vehicle, aircraft or ship.

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