EP0820823A1 - Checking device, especially for forming machines - Google Patents

Abstract

The device uses a pair of sensor elements (66,38) displaced together in the direction of the bearing surface (14) for the workpiece (60), for detecting the presence of the latter and the presence of the reception component (56) to which the workpiece is rivetted. The displacement element (104) for the sensor elements has a toothed edge (76) cooperating with an optical detector (78), for detection of the successive halt points as the sensor elements contact the workpiece and the reception component.

Description

The invention relates to a device for checking at least one receiving part and one part of it recorded and by material deformation with the Receiving part connectable workpiece, the workpiece over a top of the receiving part around a certain one Survival dimension survives. Such a device is especially for mechanical mechanical material deformation thought.

In the automation of machine-made Material deformations, such as during production of riveted joints using a riveting machine The case should be for quality assurance purposes and improvement mechanisms to verify that through Material deformation of parts to be joined together actually exist. This is all the more more important in the case where the parts to be connected automatically fed, which is to achieve a high degree of automation is inevitable. The verification, whether the parts to be connected actually are present, is conveniently done immediately before the material deformation process.

DE 37 15 905 C2 describes a method for mechanical Production of riveted joints known. According to this Procedure is carried out before the material deformation checked by means of the riveting tool (so-called striker), whether the rivet, i.e. the workpiece to be deformed, is present and, if so, whether its length is within a given Tolerance range. In this well-known Procedure is assumed that the at least one receiving part, through which the rivet extends to to protrude at the top is also present.

A review of this at least one recording part does not take place in this known method.

EP 95 112 265 A1 describes a device at the beginning described type, with that before the material deformation it is checked whether the protrusion of the to be deformed Workpiece over the receiving part within a predetermined tolerance range. Using two tactile organs both the recording part and the Workpiece approached. On the basis of the two touch organs Distance traveled can then be at known starting positions the path difference and thus the excess be determined.

The invention has for its object a device of the type mentioned at the beginning, with which an improved Quality assurance, what they go through with each other Material deformation related parts to be achieved is, the effort to determine the path of both probes and to determine the placement of the feelers should be minimized.

• einem Tragrahmen, der eine Auflagefläche für das Werkstück sowie das mindestens eine Aufnahmeteil und einen Tragarm aufweist,
• einem in Richtung auf die Auflagefläche bewegbar geführten ersten Tastorgan,
• einem in Richtung auf die Auflagefläche bewegbar an dem Tragarm geführten zweiten Tastorgan,
• einer Weggeberanordnung zum Messen der Relativ-Wegstrecke, um die sich die beiden Tastorgane im Vergleich zu ihren Ausgangspositionen zu Beginn einer Vorbewegung in Richtung auf das Aufnahmeteil und das Werkstück bis zum Stillstand relativ zueinander bewegt haben,
• einer Auswerteschaltung, die mit der Weggeberanordnung verbunden ist und die anhand eines Vergleichs der Relativ-Wegstrecke mit einem das Soll-Überstandsmaß repräsentierenden Sollwert unter Berücksichtigung eines Toleranzbereichs ermittelt, ob die Relativ-Wegstrecke um den Toleranzbereich von dem Sollwert abweicht und, wenn dies der Fall ist, ein Fehleranzeigesignal erzeugt, und
• einer mit der Auswerteschaltung verbundenen Anzeigevorrichtung zur insbesondere akustischen und/oder visuellen Anzeige des Fehleranzeigesignals.

With the invention to achieve the above object, a device of the type mentioned is provided, which is provided with

• a support frame which has a support surface for the workpiece and the at least one receiving part and a support arm,
• a first sensing element movably guided in the direction of the support surface,
• a second sensing element which is movable on the support arm in the direction of the support surface,
• a displacement sensor arrangement for measuring the relative distance by which the two sensing elements have moved relative to one another in relation to their starting positions at the start of a forward movement in the direction of the receiving part and the workpiece, to a standstill,
• an evaluation circuit, which is connected to the displacement sensor arrangement and which, based on a comparison of the relative displacement with a target value representing the target protrusion measure, taking into account a tolerance range, determines whether the relative displacement deviates by the tolerance range from the target value and, if so is generated, an error indication signal, and
• a display device connected to the evaluation circuit for, in particular, acoustic and / or visual display of the error display signal.

• daß das erste Tastorgan an einem Halteteil in Richtung auf die Auflagefläche sowie entgegengesetzt dazu verschiebbar geführt ist,
• daß das Halteteil zusammen mit dem zweiten Tastorgan bewegbar ist,
• daß das erste Tastorgan über ein Getriebe mechanisch mit einem Verschiebeteil verbunden ist, das an dem Halteteil in Richtung auf die Auflagefläche sowie entgegengesetzt dazu verschiebbar geführt ist, wobei das Getriebe die in eine erste Richtung erfolgende Bewegung des ersten Tastorgans in eine Bewegung des Verschiebeteils in eine zur ersten Richtung entgegengesetzte Richtung umsetzt, und
• daß die Weggeberanordnung versehen ist mit einem mit dem Tragrahmen verbundenen Detektor zur Ermittlung des Weges, um den sich das Verschiebeteil vorbewegt, und zur Ermittlung der Geschwindigkeit, mit der sich das Verschiebeteil vorbewegt.

According to a first variant, this device provides

• that the first sensing element is guided on a holding part in the direction of the support surface and opposite to it,
• that the holding part can be moved together with the second sensing element,
• that the first sensing element is mechanically connected via a gear to a sliding part, which is guided on the holding part in the direction of the support surface and opposite to it, the gear making the movement of the first sensing element in a first direction into a movement of the sliding part into a movement to the opposite direction to the first direction, and
• that the displacement sensor arrangement is provided with a detector connected to the support frame for determining the path by which the sliding part moves forward and for determining the speed at which the sliding part moves forward.

In the first variant, the workpiece to be deformed and the at least one recording part that the deforming workpiece or that of the workpiece to be deformed Work part is penetrated by means of separate Sensing organs detected. A first probe moves starting from a starting position towards the recording part to, after covering a first distance to contact the receiving part. At this moment is the further advance of the first probe organ prevented. The driving force with which the first probe organ being advanced is far from sufficient to when contacting the first receiving part deform or damage. By means of a second The organ to be deformed is scanned. The second probe organ also moves outwards a starting position towards the workpiece, to do this after covering a second distance to contact. Also for the driving force with which second probe organ is moved, there is none Deformation or damage to the workpiece at the Contacting is coming. Once it is determined that no longer allow both probes to advance, the Relative position of both sensing elements determined. With knowledge the starting positions of both probes and by measuring the distances covered by both sensing elements the path difference between the distances covered of the two sensing elements can be determined. The on this Way difference determined is compared with the protrusion dimension compared to the workpiece to be deformed the at least one receiving part or, in the case of several receiving parts, via the one closest to the sensing elements top receiving part survives; because with the two touch organs is just the two tactile organs facing top of the arrangement of to be deformed Workpiece and receiving part or receiving parts approached been. The determined path difference represents that Actual protrusion dimension. The path difference with the given (Target) overhang dimension compared, can under Considered a tolerance range whether the actual protrusion dimension exceeds the tolerance range deviates from the target overhang dimension.

Both sensing elements can be moved linearly on a holding part led that movable in the direction of the support surface is. Both sensing elements are via a gear Motion-coupled, and that when the first probe has touched down on the receiving part. The holding part is moved in the direction of the contact surface. As soon as that first touch organ hits the receiving part, it comes to its standstill, so that the holding part, the until then together with the sliding part (and the second probe) has moved relative to the (stationary) first probe organ moves. About the gearbox the sliding part advances as a result of the relative movement, so that the sliding part, which together with the holding part is moved forward, another movement is superimposed is, which is why the sliding part relative to Holding part moves. The detector detects from the beginning of the Movement of the holding part to the movement of the sliding part. From the moment of touchdown of the first probe the feed speed of the sliding part increases, whereby the touch probe is placed on the Recording part is detectable. There is only one for this qualitative feed speed detection of the sliding part required. According to the above arrangement the first variant is only a single detector to determine the starting point from both probes their starting position up to their touchdown covered distances required. Putting on the first probe organ is due to the speed increase of the sliding part detected while putting on the second probe by detecting the standstill of the Sliding part (even the holding part does not move then more) is recognized.

With the first variant of the device according to the invention can be both the presence of the deformed Workpiece (e.g. rivet) as well as the presence detect the at least one receiving part, wherein moreover according to the invention a statement to that effect is made whether the detected parts are acts in relation to each other (under Consideration of tolerances) target dimensions in Have direction of movement of the sensing elements.

The standstill of the second sensing element is expedient determined by the fact that the output signal of the the advance movement of the relevant sensing element Detector no longer changed. Alternatively, the The second probe organ also comes to a standstill by measuring mechanical stresses of the holding elements and movably supported machine frame can be determined. This is because it hits what is being moved with a certain force second probe on the workpiece to be contacted the driving force leads to detectable mechanical stresses in the overall construction. Exceeds the measured mechanical stress has a threshold value, so this suggests that the subject Touch probe has put on. As explained above, if first probe organ movable relative to the second probe organ guided, the (voltage) detector determines the mechanical tension when attaching the second probe on the workpiece when the distance by which the first Probe considered the second in the direction of movement advanced, is larger than the expected overhang of the Workpiece relative to the receiving part.

The most important advantage of the invention is that that they are directly in a forming machine, for example, a riveting machine can be realized. Here the deformation or riveting tool takes over the function of the (second) sensing element for detection of the material to be deformed Workpiece or rivets. On the one carrying the riveting tool Rivet heads are then relative to this in the direction of movement slidably mounted the other (first) probe and the displacement part detected by the path / speed detector arranged. The contact area of the first sensing element rushes the surface with which the riveting tool the rivet hits, more than that expected projection size. The actual deformation of the Rivets in particular take place when the riveting tool is moving, which is either a wobble (Wobble riveting) or along one Trochoids, especially a hypotrochoid (radial riveting) emotional. The feed force with which the Riveting tool is advanced until it touches the rivet, can be equal to the pressure with which this is moving riveting tool is pressed against the rivet. The Riveting tools can also be used with less force be moved forward to bear against the rivet. It is also possible without moving the riveting tool, d. H. at stationary riveting tool, through a pure pressing process to deform the rivet. In this case too Invention applicable.

In addition to the relative dimensions of the workpiece and the receiving part in the direction of movement of the sensing elements (protrusion dimension) also the absolute dimensions of the workpiece and the receiving part in the direction of movement of the feelers (workpiece length in the direction of movement of the feelers and thickness of the or the receiving parts) by means of the detector from each of the two sensing elements covered distances determined. Starting from the The moving part is at rest by its movement Advance movement of the holding part with the fixed on the support frame arranged detector the advance movement of the sliding part determined. The moment the Speed of the advance of the sliding part has increased what is detected by the detector first touch organ placed on the receiving part. At Knowledge of the starting position of the first sensing element and the distance traveled by the sliding part, which is until then at the same speed as the holding part has moved, the height of the receiving part be determined.

The forward movement of the sliding part continues with the Detector detects until it detects that the sliding part no longer moves forward. At this moment then put on the second probe. Under Taking into account the starting position of the first sensing element, the distance traveled by the sliding part up to the feed rate increase and the advance movement of the sliding part until it stops (at increased feed rate) can then be known the feed rate until the first one touches down Sensing element and the feed rate until touchdown of the second probe organ the height of the workpiece be determined. If appropriate tolerance ranges are specified error signals are then output for the case that the workpiece or the receiving part or parts an out of tolerance extension in Have direction of movement of the sensing elements.

Expediently, the one that remains scanning the workpiece remains Probe also during the mechanical deformation of the Workpiece in contact with this. From the beginning of the then the additional travel distance becomes mechanical deformation measured, which continues with a certain pressure second probe attached to the workpiece as a result the compression of the workpiece in the direction of movement Touch organs covered. Will be a given one Desired additional route before the end of a likewise specified one Minimum period reached or until expiration a maximum period of time which is greater than that Minimum time span, not reached, then an error message is displayed spent. This error message says that the Material of the workpiece to be deformed is too soft (replace the additional route before a minimum time has elapsed - Minimum time period) or is too hard (even if one The maximum time span is the target additional distance from the second probe has not been replaced). With this Checks can thus be made about the quality of the Make the material of the workpiece.

The displacement measurement of the sliding part is advantageously carried out by measuring the time periods that elapse until the sliding part starting from its starting position its feed rate increases or starts from this time to a standstill. Furthermore, the Takes into account the speed at which this Sliding part in the individual phases of its feed path emotional. These speeds are fundamental known, because on the one hand it is known with which Speed in the case of a riveting machine the rivet head connected to the holding part, and to is known to others at what speed about the gearbox relative to the holding part itself moving part with the first stationary Moving probe forward.

In an advantageous development of the invention, that the first probe and the sliding part each has a rack and that the gear as gear rotatably mounted on the holding part, that combs with both racks. To the two tactile organs after deformation of the workpiece when moving the Tool away from the rest in its starting position to convince, it is appropriate that either the first probe or the sliding part with one Return spring device for moving the first sensing element back and the sliding part in the respective starting positions cooperates. Because the first probe and that Moving part on the transmission with each other in terms of movement a return spring device is sufficient on either the first probe or the sliding part out. Of course it is also possible to do both first probe and the sliding part with each to provide a return spring device.

The detector expediently scans the sliding part optically from. For this in turn, it is appropriate that the Sliding part has a toothing. This toothing can then also for mechanical motion coupling from the first feeler and sliding part to the gear wheel trained gears can be used.

• daß das erste Tastorgan an einem Halteteil in Richtung auf die Auflagefläche sowie entgegengesetzt dazu verschiebbar ist,
• daß das Halteteil zusammen mit dem zweiten Tastorgan bewegbar ist,
• daß ein an dem Halteteil in Richtung auf die Auflagefläche sowie entgegengesetzt dazu verschiebbares Verschiebeteil vorgesehen ist, das über ein Getriebe bei Bewegung des Halteteils in Richtung auf die Auflagefläche mitbewegbar ist, bis das erste Tastorgan aufsetzt, danach für eine vorbestimmte Wegstrecke des Halteteils bei dessen weiterer Bewegung relativ zum Tragrahmen stillsetzbar ist und anschließend bei weiterer Bewegung des Halteteils in Richtung auf die Auflagefläche mit dem Halteteil wieder mitbewegbar ist, bis das zweite Tastorgan aufsetzt, und
• daß die Weggeberanordnung versehen ist mit einem Detektor zur Ermittlung, ob sich das Verschiebeteil mit dem Halteteil mitbewegt oder relativ zum Tragrahmen stillsteht, und zur Ermittlung der Wege, um die sich das Verschiebeteil jeweils ausgehend von einer Ruhelage bis zum Aufsetzen des ersten Tastorgans bzw. des zweiten Tastorgans bewegt.

According to a second variant of the device according to the invention of the type mentioned above,

• that the first sensing element on a holding part in the direction of the support surface and opposite to it is displaceable,
• that the holding part can be moved together with the second sensing element,
• that a sliding part is provided on the holding part in the direction of the supporting surface and opposite thereto, which can be moved via a gear when the holding part moves in the direction of the supporting surface until the first sensing element touches down, then for a predetermined distance of the holding part in the further one Movement can be stopped relative to the support frame and can then be moved again with further movement of the holding part in the direction of the support surface with the holding part until the second sensing element touches down, and
• that the displacement sensor arrangement is provided with a detector for determining whether the sliding part is moving with the holding part or is stationary relative to the supporting frame, and for determining the paths by which the sliding part starts from a rest position until the first touch element or the second probe organ moves.

In this second variant of the invention, the first is Probe on a holding part in the direction of the support surface as well as displaceable opposite, the Holding part is movable together with the second probe. A sliding part is arranged on the holding part Direction to the contact surface and opposite to it is slidably guided on the holding part. Via a transmission is the sliding part with both the first probe and also mechanically coupled to the holding part. This Gear ensures that the sliding part when moving of the holding part in the direction of the bearing surface of the Holding part is taken until the first probe on of the contact surface. Then the sliding part is for a predetermined distance of the holding part relative to the support frame. After the holding part has covered the predetermined distance, it will Sliding part of the holding part during its further movement in the direction of the contact surface until the second touch organ is placed on the support surface. In this The moment is both the movement of the holding part as well of the sliding part ended.

In other words, the sliding part by the Gearbox when the holding part moves in the direction of the Support surface moved forward by a first distance until the first touch organ is placed on the support surface. Subsequently, the holding part moves around the predetermined one Distance further; this takes the holding part however, the sliding part is not included. Rather, it stands Sliding part relative to the support frame still. Only after the holding part covered the predetermined distance it takes the sliding part with it again, until has placed the second probe on the support surface. The movement of the sliding part takes place in two Movement sections. Both movement sections are from a detector of the displacement sensor arrangement. This On the one hand, detector detects whether the sliding part is moving becomes or stands still, and secondly to what extent that Moving part is moved. The difference between the two Movements of the sliding part is a measure of the protrusion.

The advantage of the second variant of the invention The device can be seen in that the two measuring sections, around which the sliding part moves when the Holding part is moved in the direction of the support surface, through the intermediate resting phase of the sliding part are separated from each other. The detector and the evaluation circuit recognize from the intermediate resting phase how long the respective distances that the sliding part are covered. The distinction is metrological of these two routes in the second variant of the Invention easier to implement than the first Variant, based on the speed at which the sliding part moves, it is detected whether the first or has placed a second probe.

In an advantageous development of the invention, that the sliding part between two springs is arranged, one of which is a spring on the sliding part and is supported on the holding part and the sliding part with a pretensioning force directed at the bearing surface acted upon while the second spring between the Sliding part and the first sensing element is arranged and on the first sensing element on the support surface exerted biasing force. The first spring points a lower preload than the second spring on. The spring coupling described above is a simple one constructive realization of the transmission Moving the holding part in the direction of the support surface moves the holding part on the first spring, the sliding part With. As soon as the first probe, that over the second stronger spring is coupled to the sliding part has the support surface put on, there is a Compression of the first spring until the sliding part is in Contact with a stop of the holding part. For the Duration of compression of the spring and movement of the Sliding part moved up to the stop of the holding part the sliding part is not relative to the frame. First then when the sliding part on the stop of the holding part is present, the sliding part together with the holding part moved in the direction of the support surface. One occurs during this phase of the movement Compression of the second spring because of the advance of the sliding part that already lies on the support surface first touch organ can not be moved, that Sliding part and the first probe organ so each other approach.

In an advantageous development of the invention is also provided that the sliding part between two Stops the holding part is slidable, both Stops in the direction of movement of the holding part on each other follow and the first stop closer to the support surface is arranged as the second stop. The first feather is arranged such that the sliding part preloaded against the first stop. The sliding part can be against the biasing force of the first spring move against the second stop.

The first sensing element is expediently displaceable on out the sliding part and in by the second spring Biased towards the bearing surface.

In an advantageous development of the invention, that the sliding part has a toothing that is optically scanned by the detector. Alternatively can the linear movement of the sliding part in a Rotational movement of a meshing with the sliding part Gear are implemented, the rotation of which is a measure for the displacement of the sliding part. The covered The route is either direct or indirect by determining the length of time for which the sliding part moved and based on the speed with the the holding part is moved forward.

As already briefly explained above, the evaluation circuit interprets putting the first probe on the Contact surface based on the first standstill of the previous one moving sliding part that with the beginning of the movement of the Holding part has been moved from its starting position. The second probe is placed in the evaluation circuit recognized at the time the detector the next, d. H. second standstill of the sliding part reports. Based on the distances that the sliding part starting from its starting position to the first Standstill and starting from the first standstill until second standstill, the excess length can then can be determined by difference. Here must also be taken into account the distance by which Holding part has moved forward while the sliding part is stationary. This route is structurally clearly defined and can be included in the calculations will.

The evaluation circuit is expediently based on a comparison of the at the first standstill of the sliding part present output signal of the detector with a setpoint taking into account the starting position of the sliding part determines whether the extension of the receiving part in the direction of movement of the holding part is outside a tolerance range. Is that the case, this result is sent to the display device indicating signal (error signal) output.

It is also advantageous if the evaluation circuit based on a comparison of the second time the Sliding part present output signal of the detector with a setpoint taking into account the shift position of the sliding part at the moment of taking of the first standstill determines whether the extension of the Workpiece in the direction of movement of the holding part outside within a tolerance range. If this is the case, then to the display device to indicate this fact Signal (error signal) output.

As with the first variant of the invention, also the second variant of the invention preferably directly in a cold forming machine, for example a riveting machine realize. Here is the second probe organ Deformation tool for the mechanical deformation of the workpiece. The deformation tool is on a rotatable Tool head arranged, which is slidable on the support arm guided and drivable in the direction of the support surface is what is particularly pneumatic, hydraulic or done mechanically. In particular, the invention use with a wobble riveting machine.

To determine the placement of the second sensing element on the workpiece, it is useful to output a mechanical tension detecting detector evaluate, with the detector arranged on the support frame is. In addition, the change signal of the Detector of the displacement sensor arrangement for determining the touchdown of the second probe on the workpiece will.

The above in connection with preferred further developments The measures described in the invention can be equally both on one according to the invention working device as well as a verification process apply. For the rest, what makes the features more advantageous Refinements of the invention relates to Subclaims referenced.

Fig. 1

einen Teillängsschnitt durch eine Nietmaschine als ein Beispiel für eine Vorrichtung zum maschinellen Durchführen einer mechanischen Verformung, bei der die beiden das Werkstück und das bzw. die Aufnahmeteile abtastenden Tastorgane in ihrer Ausgangsposition dargestellt sind,

Fig. 2

einen Teillängsschnitt durch die Maschine gemäß Fig. 1 in dem Augenblick, in dem das voreilende erste Tastorgan auf das Aufnahmeteil aufsetzt,

Fig. 3

einen Teillängsschnitt durch die Nietmaschine gemäß Fig. 1 in dem Zustand, in dem beide Tastorgane stillstehen, d. h. das eine Tastorgan das Werkstück und das andere Tastorgan das Aufnahmeteil kontaktiert,

Fig. 4

einen Teillängsschnitt durch eine Nietmaschine gemäß einem zweiten Ausführungsbeispiel der Erfindung, und

Fig. 5-9

Teilansichten der Nietmaschine gemäß Fig. 4 in unterschiedlichen Phasen der Abwärtsbewegung des Nietmaschinenkopfes.

Two exemplary embodiments of the invention are explained in more detail below with reference to the figures. In detail show:

Fig. 1

2 shows a partial longitudinal section through a riveting machine as an example of a device for mechanically carrying out a mechanical deformation, in which the two sensing elements scanning the workpiece and the receiving part or parts are shown in their starting position,

Fig. 2

2 a partial longitudinal section through the machine according to FIG. 1 at the moment in which the leading first sensing element touches the receiving part,

Fig. 3

1 in the state in which both sensing elements are stationary, ie one sensing element contacts the workpiece and the other sensing element contacts the receiving part,

Fig. 4

a partial longitudinal section through a riveting machine according to a second embodiment of the invention, and

Fig. 5-9

4 in different phases of the downward movement of the riveter head.

In Fig. 1 is a longitudinal section as an example of a device for the mechanical execution of mechanical cold forming processes a riveting machine 10, partly in Longitudinal section, shown. The riveting machine 10 has one Support frame 12 or a frame that has a bearing surface 14 and a vertical support arm 16 which with the support surface 14 is connected and at right angles from this protrudes upwards. On the support arm 16 is a machine housing 18 attached. In the machine housing 18 is a pneumatic piston 20 slidably mounted. Of the Piston 20 is parallel to the extension of the support arm 16 at right angles in the direction of the contact surface 14 and conversely axially movable. The piston 20 has one radially outwardly projecting flange 22, which is in a cavity 24 of the machine housing 18 moves when the piston 20 is moved. The cavity 24 is with a pneumatic pressure line 26 and one pneumatic vent line 28 connected. At Supply of compressed air via the pressure line 26 is the Piston 20 against the force of a (not shown) The spring is advanced in the direction of the bearing surface 14.

The piston 20 is hollow and points to it axial ends of internal pivot bearings 30, 32 for a rotatably drivable drive shaft 34. The drive shaft 34 extending axially through the piston 20 extends, contributes to its facing the support surface 14 a tool holder or rivet head 36, which holds a riveting tool 38 (striker). The striker is at the lower end facing away from the drive shaft 34 of the tool holder 36 held clamped. That up End 40 of the drive shaft projecting from the piston 20 34 is designed as a polygonal profile and one cross-sectionally identical sleeve 42 added. The top End 40 is slidably received by sleeve 42. The sleeve 42 is rotatably supported and by one driven at 34 indicated electric motor.

When the electric motor 44 is driven, it drives the Sleeve 42 on. The tool holder 36 and thus rotate with this the riveting tool 38. A deformation in itself rotating riveting tool 38 is by moving the Piston 20 in the direction of the bearing surface 14 causes. The axial length of the sleeve 42 and the drive shaft end 40 is dimensioned such that sleeve 42 and drive shaft 34 also in the most distant lowest Position of the piston 20 are still in engagement with each other. The riveting machine 10 described here is a wobble or radial riveting machine in which the cold deformation of a workpiece to be deformed Applying a pressing force with which the riveting tool 38 presses against the workpiece to be deformed, and at the same time Tumbling or rotating movement of the riveting tool 38 he follows.

In Fig. 1, a recording is shown at 46, the the bearing surface 14 rests and is fastened there. The In turn, receptacle 46 carries the rivets to be riveted together Parts. In the example shown here the workpiece to be deformed is a Threaded stud 48, which is a tapered riveting tool 38 opposite bolt end 50 and one a threaded portion 54 carrying an internally threaded bore 52 having. The tapered section 50 extends through an opening in a receiving part 56 indicated at 56. The one protruding from the tool holder 36 or the riveting tool 38 Part of the tapered threaded bolt section 50 (Overhang) is caused by cold forming using the riveting tool deformed into the so-called closing head, the protrudes radially through the opening in the receiving part 56 and towering over it radially. The tool holder 36 and the riveting tool 38 facing top 58 of the riveted Arrangement of threaded stud 48 and receiving part 56 has the necessary for the material deformation Survived 60 on.

In the embodiment shown and described here is only a receiving part 56 (in the form of a Plate) shown with which the threaded stud 48th (Workpiece) to be connected. The riveted joint ensures that the threaded stud is held in this case 48 on the receiving part 56, which is for example a plate. In the conventional Senses are used to rivet several parts together connect to. In such an application would a rivet z. B. two plate-shaped receiving parts connect with the head of the rivet to the a receiving part rests and the rivet shaft through aligned openings in both or the extends several receiving parts.

At the lower end of the piston 20 is connected to it Holding part 62 attached, approximately laterally in addition to the rivet head 36 holding the riveting tool 38 is arranged. On the holding part 62 is one in the direction of the double arrow 64 slidably mounted sensing element 66 arranged, which has a toothing or rack 68. There is also a gear 70 on the holding part 62, that meshes with the rack 68 of the sensing element 66. Finally, there is also a strip-shaped on the holding part 62 Sliding part 72 in the direction of the double arrow 74 movably mounted. This sliding part 74 has one Teeth or a rack 76 on the gear 70 combs. The racks 68 and 76 run parallel to each other and face each other, with the gear 70 disposed between them. Firmly with the vertical support arm 16 of the support frame 12 is a Optical detector 78 arranged above the holding part 62 is arranged and the toothing 76 of the sliding part 72 recorded. When the sliding part 72 moves detector 78 generates pulses in accordance with the passing teeth 76.

As in the starting position of the riveting machine according to FIG. 1 can be seen, the bottom 79 of the L-shaped protrudes Probe organ 60 over the end face 80 of the riveting tool 38 before. The axial distance a between these two Areas, d. H. the distance of these two surfaces in Direction of movement of the piston 20 is greater than that (Actual) projection b by which the tapered section 50 of the Threaded stud 48 over the top 58 of the receiving part 56 survives.

Finally, the machine 10 has one in the form of a Strain gauge present voltage detector 81 for Measurement of mechanical stresses of the support frame 12. The function of this voltage detector 81 will continue below. The two detectors 78 and 81 are connected to an evaluation circuit 82 which the output signals of the displacement detector 78 and the Voltage detector 81 receives. The evaluation circuit 82 is also electrically connected to the motor 44, to control it, especially to switch it on and off. With the evaluation circuit 82 is also a Display / data input device 84 connected, the one Display part 86 and a keypad 88 for data entry having. Finally, the evaluation circuit 82 is included Control valves 90.92 for the pressure line 26 and the vent line 28 connected to release these lines or to block.

With the riveting machine 10 described here check the phase immediately before the cold forming process, whether the parts to be riveted together of the support surface 14 or in the receptacle 46 of the support surface 14 are whether the (actual) projection b taking into account of tolerances corresponds to a specified target value and whether the parts to be riveted the required Have nominal dimensions. To check all these requirements the riveter 10 operates as follows.

Starting from the starting position shown in FIG. 1 through corresponding output signals of the evaluation circuit 82 opened the control valves 90 and 92, with what the piston 20 in the direction of arrow 94 on the bearing surface 14 is moved to. With the piston 20 move consequently also the riveting tool 38 in the direction of the Threaded stud 48 and the holding part 62 in the direction the support member 56. During this phase of the advance the riveting tool 38 stands still. The advance of the Piston 20 is based on that moving forward with the holding part 62 Sliding part 72 by the detector 78 recognized. With the piston 20 also moves the feeler 66 in the direction of arrow 94.

This advance movement of the piston 20 when the riveting tool is at a standstill 38 continues until both the annular face 66 of the sensing sleeve 62, the receiving part 56 as well the end face 74 of the riveting tool 38 the threaded stud 48 has contacted. The situation at Contacting of the receiving part 56 by the feeler 66 shown in Fig. 2. Since the axial offset between the Bottom 79 of the sensing element 66 and the end face 74 of the Riveting tool 38 is larger than the expected projection of tapered portion 50 of the threaded stud 48 via the receiving part 56 remains with receiving part already contacted by the feeler element 66 56 between the riveting tool 38 and the upper end of the threaded stud 48 still a distance c, the same the difference between the distances a and b is. The sensing element 66 can no longer be used advance further when the piston 20 moves in the direction of the Arrow 94 moves on. Hence there is a relative movement between the feeler 66 and the piston 20 and thus the holding part 62; in other words, moves thus the feeler 66 with respect to the holding part 62 in Arrow 94 opposite direction. Even during this The riveting tool is in the phase of advancing the piston 20 38 silent.

The return movement of the feeler 66 relative to the itself continue to advance with the piston 20 in the direction of arrow 94 Holding part 62 is in a via the gear 70 Movement of the sliding part 72 relative to the holding part 62 implemented in the direction of arrow 94. This additional Advance movement of the sliding part 72 becomes the advance movement of the sliding part 72 due to the advance of the Piston 20 superimposed, so that the forward movement of the sliding part 72 from the moment the touch element 66 touches down on the receiving part 56 at increased speed he follows. This increase in speed is due to the Detector 78 recognized, which also gives a possibility is, the time of touch of the sensing element 66 on the receiving part 56 to be detected. When moving forward relative to the holding part 62, the sliding part 72 clamps one Return spring 96, which is on the one hand on the sliding part 72nd and on the other hand is supported on the holding part 62.

The advancement of the piston 20 takes place at that moment its (at least preliminary) end in which the end face 74 is placed on the threaded stud 48. This Touchdown is recognized in the evaluation circuit 82. It will namely between the machine housing 18 and the Support arm 16 a mechanical stress in response to the driving force still acting on the piston 20 at adjust the riveting tool 38 to the threaded stud 48. The between the machine housing 18 and the Support arm 16 arranged detector 81 measures this rising mechanical tension. This is in the evaluation circuit 82 Measuring signal of the detector 81 compared with a threshold. Exceeds the output of detector 81 the threshold value is interpreted by the evaluation circuit 82 this as a placement of the riveting tool 38 on the Threaded stud 48. In this state is the Riveting machine 10 in the drawing shown in Fig. 3 Situation. Both the bottom of the probe organ 66 and the end face 74 of the riveting tool 38 lie on the receiving part 56 and the Threaded stud 48. By means of the detector 78, the Output signal of the evaluation circuit 82 is always supplied can now be determined by what amount starting from the starting position the feeler 66 has moved relative to the piston 20. This movement is through the feed movement of the sliding part 72 relative to the Holding part 62 or piston 20 determines their speed and time in turn by the path / speed detector 78 was recognized. Since the distance a the known both surfaces 66 and 74 in the starting position is and the displacement of the sensing sleeve 62 relative to Piston 20 is measured, the distance can now of areas 66 and 74 are determined. This distance corresponds exactly to the actual overhang b (see Fig. 3). By Comparison with a target overhang that previously over the Keypad 88 entered into the evaluation circuit 82 can now be checked whether the Actual projection b is greater than or less than or equal to that Target overhang is. Taking into account one too tolerance range entered into the evaluation circuit 82 can be used to make a statement as to whether the Actual projection b within the specified tolerance located. If this is not the case, the Evaluation circuit an error signal indicating this state, a corresponding optical one on the display 86 Generated ad; in addition, an acoustic Display. Otherwise, the working cycle of the Riveting machine 10 canceled.

Is the actual overhang b within the specified Tolerance range, depending on the version of the riveting machine the next step is to check whether the threaded stud 48 and the receiving part 56 the predetermined Extentions in the direction of movement of the Have piston 20. To do this, the distance covered is first Total distance of the piston 20 determined. this happens based on the signals from the detector 78, the advance of the sliding part 72 up to the point of contact of the piston 20 has detected. With the piston 20 in a known starting position relative to the support surface 14 or to the receptacle 46 then determined based on the total distance covered which axial length of the threaded stud bolts 48 has. By comparing with a setpoint, under Taking into account a specified tolerance range be decided whether the threaded stud 48 has an axial length within the tolerance. Based on the total distance and the Relative distance can be at a defined starting position of piston 20 and feeler 66 relative to each other and in Regarding the bearing surface 14 and the receptacle 46 the Thickness (extension in direction of movement 94) of the receiving part 56 can be determined. The so determined Value is also given taking into account Tolerances compared to a setpoint to check that the thickness of the receiving part 56 is within the tolerance lies. If this is not the case, the Evaluation circuit 82 indicating this state optical and / or acoustic error signal. Furthermore, the working cycle of the riveting machine 10 is interrupted.

Only when the above check of the height difference between rivet and receiving part and checking the The absolute length of the rivet (if provided) is positive is, the evaluation circuit 82 switches the electric motor 44 for rotation of the riveting tool 38. As a result the contact pressure with which the piston 20 against the threaded stud 48 is held down, there is a Cold working and upsetting the protruding tapered Section 50 of the threaded stud 48. The additional Displacement of the piston 20, which this due to Cold deformation of the threaded stud 48 can, if desired, metrologically via the Detector 78 can be detected, the advance of the sliding part 72 recorded. Furthermore, at the beginning of the switch-on of the electric motor 44 in the evaluation circuit 82 take a time measurement. Requires the piston 20 to Covering a target additional distance longer than one predetermined minimum time and less than a predetermined Maximum time, the riveting is done properly and the riveting machine 10 is without any further Information display or with the information display "Riveting OK" deactivated. On the other hand, the deformation takes place within a shorter time of the minimum time, d. H. the piston 20 reaches the target additional travel distance faster than specified by the minimum time, so lets conclude that the material of the threaded stud 48 is too soft. Conversely, too hard Material of the threaded stud 48 are closed, when the piston 20 is up to the end of the maximum time Has not yet covered the planned additional route. In in both of these cases the deformation process is carried out with a Error display canceled.

Using the figures 4 to 9 will be followed by a second Embodiment of the invention received. The device 100 according to this second embodiment except for the coupling of the first sensing element 66 with the The holding part 62 has the same structure as the device 10 in FIG Fig. 1 to 3, which is why in Figs. 4 to 9, if possible, for identical or functionally identical elements of the device 100 the same reference numerals as in FIGS. 1 to 3 are used.

As can be seen from FIG. 4, this indicates that Piston 20 holding part 62 which projects from this a recess 102 in which a slidable in this Recess 102 guided sliding part 104 is arranged is. The recess 102 is in the radial direction of the As viewed from the outside, piston 20 is open. The one about this Outside of the recess 102 arranged outside of the Sliding part 104 is provided with a toothing that meshes with a gear 106, the rotational movement of which Detector 78 is recognized.

The displacement path of the displacement part 104 in the recess 102 is through an upper stop 108 and a limited lower stop 110. Both stops 108 and 110 lie in the direction of movement 94 of the piston 20 and thus of the holding part 62. Between the upper stop 108 and a first helical compression spring acts on the sliding part 104 112, the sliding part 104 against the prestresses lower stop 110. From below through the The lower stopper 110 protrudes into the first sensing element 66 Recess 102 and the sliding part 104 into it. The first sensing element 66 points at its in the sliding part 104 protruding end on a flange 114, the abuts a stop 116 of the sliding part 104, whereby the first sensing element 66 cannot be lost on the sliding part 104 is arranged. Between the first sensing element 66 and the slide member 104 is a second coil compression spring 118 arranged on the one hand on the sliding part 104 and on the other hand on the flange 114 of the first Probe organ 66 supports and the first probe organ 66th biased against the stop 116 of the sliding part 104. The biasing force applied by the first spring 112 is less than the biasing force of the second spring 118.

4 shows the initial situation of the device 100, before the piston 20 in the direction of arrow 94 in Moved towards the bearing surface 14. With control the piston 20 moves together with the holding part 62 in the direction of arrow 94. During this phase there are no relative movements of the movement between the holding part 62 and the sliding part 104, the via the first spring 112 coupled in motion to the holding part 62 and is taken away by it. In order to the sliding part 104 moves relative to the gear 106 of the detector 78 and drives it so that the Detector 78 the amount of movement of the sliding part 104 can detect.

5 shows the situation in which the first sensing element 66 rests on the receiving part 56. With the further Movement of the piston 20 and the holding part 62 in the direction the arrow 94, the sensing element 66 can now no longer move along; the first feeler pushes through the spring 118 66 now the sliding part 104 within the recess 102 opposite to direction 94 upwards, and against the biasing force of the spring 112, the weaker is designed as the spring 118. In this way the sliding part 104 according to the intermediate position Fig. 6 in contact with the upper stop 108 of the recess 102, which is shown in Fig. 7, the Spring 112 is compressed. During this phase of Movement of the piston 20 and thus the holding part 62 in The sliding part 104 is thus in the direction of the arrow 94 relative to the support frame 12 or support arm 16 of the device 100 silent, what is detected by the detector 78 becomes. The detector 78 thus measures the amount of displacement of the Sliding part 104 starting from the position shown in FIG Fig. 4 until reaching the position of FIG. 5, wherein the placement of the first sensing element 66 based on the standstill the one previously moved in the direction of arrow 94 Sliding part 104 is recognized.

At the moment when the sliding part 104 on the upper Stop 108 of the recess 102 of the holding part 62 rests, the standstill phase of the sliding part 104 has ended, from then on again from the holding part 62 in the direction of Arrow 94 is taken. This continues to occur the first sensing element 66 resting on the receiving part 56 Compression of the spring 118 into the sliding part 104, which is shown in Fig. 8. The downward movement of the Piston 20 and thus the holding part 62 in the direction of Arrow 94 is ended at the moment when the riveting tool 38 rests on the threaded stud 48 (see Fig. 9). This completes the sampling phase, whereby based on the two due to the temporary standstill of the displacement part 104 from this distance traveled by forming a difference to the excess length of the Threaded stud can be closed. Here is too take into account that for the phase of standstill of the Sliding part 104 of the piston 20 and thus the second Probe in the form of the riveting tool 38 in the direction of Arrow 94 has moved on without this movement has been detected by detector 78. This distance, the riveting tool 38 when the sliding part is stationary 104 covered, but is due to the difference in length between the sliding part 104 and the recess 102 and thus clearly determined in terms of construction. This "game" of Sliding part 104 within the recess 102 in Direction of arrow 94 can therefore be used to calculate the Enter protrusion dimension as a fixed size.

The path differences are evaluated in the device 100 as in connection with the embodiment the fig. 1 to 3 explained above. Of course can also in the device 100 Measurement of the material properties of the threaded stud Bring in (hardness); this is also related to the embodiment of FIGS. 1 to 3 in detail described why at this point on the above Description can be referenced.

Claims (23)

Device for checking at least one receiving part and a workpiece which is partially received by the latter and can be connected to the receiving part by material deformation, the workpiece projecting beyond a top side of the receiving part by a certain desired protrusion dimension a support frame (12), which has a support surface (14) for the workpiece (48) and the at least one receiving part (56) and a support arm (16), a first sensing element (66) which is movably guided in the direction (94) onto the support surface (14), a second sensing element (38), which is movable on the support arm (16) in the direction (94) of the support surface (14), a displacement sensor arrangement (78) for measuring the relative distance by which the two sensing elements (66, 38) are compared to their starting positions at the start of a forward movement in direction (94) towards the receiving part (56) and the workpiece (48) to have moved to a standstill relative to each other, an evaluation circuit (82), which is connected to the displacement sensor arrangement (78) and which, based on a comparison of the relative displacement with a desired value representing the target overhang dimension, taking into account a tolerance range, determines whether the relative displacement deviates from the desired value by the tolerance range and, if so, generates an error indication signal, and a display device (86) connected to the evaluation circuit (82) for, in particular, acoustic and / or visual display of the error display signal, characterized by that the first sensing element (66) is guided on a holding part (62) in the direction of the support surface (14) and in the opposite direction, that the holding part (62) can be moved together with the second sensing element (38), that the first sensing element (66) is mechanically connected via a gear (70) to a sliding part (72) which is guided on the holding part (62) in the direction of the bearing surface (14) and in the opposite direction, whereby the gear (70 ) converts the movement of the first sensing element (66) in a first direction into a movement of the sliding part (72) in a direction opposite to the first direction, and that the displacement sensor arrangement is provided with a detector (78) connected to the supporting frame (12) for determining the path by which the sliding part (72) moves forward and for determining the speed at which the sliding part (72) moves forward. Device according to claim 1, characterized in that the first sensing element (66) has a gear rod (68) has that the sliding part (72) a rack (76) and that the transmission as with two toothed racks (68, 76) meshing gear (70) is formed, which is rotatable on the holding part (62) is stored. Device according to claim 1 or 2, characterized in that that the first sensing element (66) or the sliding part (72) with a return spring device (96) to move the back out of their starting positions moved first probe organ (66) and of the sliding part (72) in the respective starting position interacts, in which the first probe organ (66) and the second probe (38) neither Receiving part (56) still the workpiece (60) to contact. Device according to claim 3, characterized in that both the first sensing element (66) and the sliding part (72) each with a return spring device (96) interact. Device according to one of claims 1 to 4, characterized characterized in that the sliding part (72) a Has teeth (76) which are from the detector (78) is optically scannable. Device according to one of claims 1 to 5, characterized characterized in that the evaluation circuit (82) the Put on the first probe organ (66) at the time recognizes in which the detector (78) an increase in speed of the sliding part (72) reports, and the placement of the second sensing element (38) in the Detects the time at which the detector (78) detects the Standstill of the sliding part (72) reports, and that the evaluation circuit (82) the time period between measures these two times and based on these Time the path difference of both probes (66.38) determined. Device according to one of claims 1 to 6, characterized characterized in that the evaluation circuit (82) based on a comparison of the when the first probe organ is at a standstill (62) present output signal of the Detector (78) with a setpoint taking into account the starting position of the first sensing element (66) determines whether the extension of the receiving part (56) in the direction of movement (94) of the first Probe (66) outside a tolerance range and, if so, to the display device (86) a showing this result Outputs signal. Device according to one of claims 1 to 7, characterized characterized in that the evaluation circuit (82) based on a comparison of the when the second probe organ is at a standstill (38) present output signal of the Detector with a setpoint taking into account the starting position of the second sensing element (38) determines whether the extension of the workpiece (48) in Direction of movement of the second sensing element (38) outside a tolerance range, and if this is the Case, to the display device (86) this one Output result signal. Device according to one of claims 1 to 8, characterized characterized in that the second probe (38) Deformation tool for the mechanical deformation of the Workpiece (48) and that the deformation tool is arranged on a rotatable tool head (36), which on the support arm (16) slidably guided and in Direction on the support surface (14) drivable, and in particular pneumatically, hydraulically or is mechanically drivable. Device according to one of claims 1 to 9, characterized characterized in that on the support frame (12) Detector (81) for determining mechanical stresses The evaluation circuit (82) is provided. is connected, and that the evaluation circuit (82) for Determining the placement of the second probe member (38) the output signal of the Compares the detector (81) with a threshold value. Device according to one of claims 1 to 10, characterized in that the evaluation circuit (82) the change signal of the Detector (78) of the displacement sensor arrangement is determined and to determine the placement of the second probe (38) on the workpiece (48) the change signal with a threshold value. Device for checking at least one receiving part and a workpiece which is partially received by the latter and can be connected to the receiving part by material deformation, the workpiece projecting beyond a top side of the receiving part by a certain desired protrusion dimension a support frame (12), which has a support surface (14) for the workpiece (48) and the at least one receiving part (56) and a support arm (16), a first sensing element (66) which is movably guided in the direction (94) onto the support surface (14), a second sensing element (38), which is movable on the support arm (16) in the direction (94) of the support surface (14), a displacement sensor arrangement (78) for measuring the relative distance by which the two sensing elements (66, 38) are compared to their starting positions at the start of a forward movement in direction (94) towards the receiving part (56) and the workpiece (48) to have moved to a standstill relative to each other, an evaluation circuit (82), which is connected to the displacement sensor arrangement (78) and which, based on a comparison of the relative displacement with a desired value representing the target overhang dimension, taking into account a tolerance range, determines whether the relative displacement deviates from the desired value by the tolerance range and, if so, generates an error indication signal, and a display device (86) connected to the evaluation circuit (82) for, in particular, acoustic and / or visual display of the error display signal, characterized by that the first sensing element (66) can be displaced on a holding part (62) in the direction of the support surface (14) and in the opposite direction, that the holding part (62) can be moved together with the second sensing element (38), that a sliding part (104) which is displaceable on the holding part (62) in the direction of the bearing surface (14) and opposite thereto is provided, which via a gear (108-116) when the holding part (62) moves in the direction of the bearing surface (14 ) can be moved together until the first sensing element (66) touches down, then can be stopped for a predetermined distance of the holding part (62) as it continues to move relative to the supporting frame (12) and then with further movement of the holding part (62) in the direction of the bearing surface (14) with the holding part (62) can be moved again until the second sensing element (38) touches down, and that the displacement sensor arrangement is provided with a detector (78) for determining whether the sliding part (104) moves with the holding part (62) or is stationary relative to the supporting frame (12), and for determining the paths by which the sliding part (104 ) each moving from a rest position until the first sensing element (66) or the second sensing element (38) touches down. Device according to claim 12, characterized in that the transmission one between the cold part (62) and the sliding part (104) arranged first Has spring (112) on the sliding part (104) one directed onto the support surface (14) Exerts preload, and that the transmission further one between the sliding part (104) and the first Probe element (66) has a second spring (118), the one on the first sensing element (66) as well biasing force directed onto the bearing surface (14) and thus one on the sliding part (104) Preload force of the first spring (112) opposite Applies pretensioning, the pretensioning force of first spring (112) is less than the second Spring (118). Device according to claim 13, characterized in that the sliding part (104) between two Stops (108, 110) of the holding part (62) are displaceable is, the first stop (110) closer to the bearing surface (14) is arranged as the second Stop (108), and that the first spring (112) Sliding part (104) against the first stop (110) preloaded. Device according to claim 13 or 14, characterized in that that the first sensing element (66) is displaceable guided on the sliding part (104) and through the second spring (118) in the direction of the bearing surface (14) against a stop (116) of the sliding part (104) is biased. Device according to one of claims 12 to 15, characterized in that the detector (78) also the speed of movement of the sliding part (104) determined. Device according to one of claims 12 to 16, characterized in that the sliding part (104) has a toothing (76) which is detached from the detector (78) is optically scannable. Device according to one of claims 12 to 17, characterized in that the evaluation circuit (82) putting on the first probe (66) at the time when the Detector (78) the first standstill of the previous one moving moving part (104) reports, and the touchdown of the second sensing element (38) at the time recognizes in which the detector (78) the standstill of the Sliding part (104) reports, and that the evaluation circuit (82) the time periods of the movements of the sliding part (104) between their start and Standstill and the length of time for which the sliding part (104) stands still, measures, and for the first time based on the speed of movement of the Holding part (62) the distance of the sliding part (104) until the first touch element is attached (66) and the distance of the sliding part (104) until the second stylus is attached (38) measures and taking into account the stationary sliding part (104) from the second probe (38) the distance covered both probes (66,38) determined. Device according to one of claims 12 to 18, characterized in that the evaluation circuit (82) based on a comparison of the at first standstill of the sliding part (104) Output signal of the detector (78) with a setpoint taking the starting position into account of the first sensing element (66) determines whether the Extension of the receiving part (56) in the direction of movement (94) of the first sensing element (66) outside within a tolerance range, and if so to the display device (86) Output result signal. Device according to one of claims 12 to 19, characterized in that the evaluation circuit (82) based on a comparison of the at second standstill of the sliding part (104) Output signal of the detector with a Setpoint taking the starting position into account of the second sensing element (38) determines whether the Extension of the workpiece (48) in the direction of movement of the second probe member (38) outside a tolerance range and, if so, to the Display device (86) this result signal. Device according to one of claims 12 to 20, characterized in that the second sensing element (38) a deformation tool for mechanical deformation of the workpiece (48) and that the deformation tool on a rotatable tool head (36) is arranged, which is displaceable on the support arm (16) guided and in the direction of the support surface (14) drivable, especially pneumatic, is driven hydraulically or mechanically. Device according to one of claims 12 to 21, characterized in that on the support frame (12) Detector (81) for determining mechanical stresses The evaluation circuit (82) is provided. is connected, and that the evaluation circuit (82) for Determining the placement of the second probe member (38) the output signal of the Compares the detector (81) with a threshold value. Device according to one of claims 12 to 22, characterized in that the evaluation circuit (82) the change signal of the Detector (78) of the displacement sensor arrangement is determined and to determine the placement of the second probe (38) on the workpiece (48) the change signal with a threshold value.

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