EP1447157B1 - Méthode de contrôle de l'installation d'éléments de fixation aveugles - Google Patents

Méthode de contrôle de l'installation d'éléments de fixation aveugles Download PDF

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Publication number
EP1447157B1
EP1447157B1 EP04002257A EP04002257A EP1447157B1 EP 1447157 B1 EP1447157 B1 EP 1447157B1 EP 04002257 A EP04002257 A EP 04002257A EP 04002257 A EP04002257 A EP 04002257A EP 1447157 B1 EP1447157 B1 EP 1447157B1
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EP
European Patent Office
Prior art keywords
force
setting process
values
tensile force
blind fastener
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP04002257A
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German (de)
English (en)
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EP1447157A1 (fr
Inventor
Mathias Henrich
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Innovatec AG
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Innovatec AG
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Publication date
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Publication of EP1447157A1 publication Critical patent/EP1447157A1/fr
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Publication of EP1447157B1 publication Critical patent/EP1447157B1/fr
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J15/00—Riveting
    • B21J15/10—Riveting machines
    • B21J15/28—Control devices specially adapted to riveting machines not restricted to one of the preceding subgroups
    • B21J15/285—Control devices specially adapted to riveting machines not restricted to one of the preceding subgroups for controlling the rivet upset cycle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J15/00—Riveting
    • B21J15/02—Riveting procedures
    • B21J15/04—Riveting hollow rivets mechanically
    • B21J15/043—Riveting hollow rivets mechanically by pulling a mandrel

Definitions

  • the invention relates to a method for monitoring the processing of blind fasteners in which a force component is measured during the setting process, and the measured signals obtained are evaluated between the end of the process and the following setting process in a desired-actual comparison with reference values.
  • EP 0 454 890 B1 has disclosed a device for monitoring processing devices for blind fasteners which has a blind rivet setting device with a pulling mechanism for applying a tensile force to the blind fastener of a blind rivet to be set.
  • a force measuring device connected to a monitoring device is provided in the pulling mechanism, which converts mechanical stresses into electrical quantities which are compared by the monitoring device with a predetermined and stored in a memory setpoint. If the respectively determined electrical variable deviates from its predetermined desired value, then the monitoring device generates an optical or acoustic signal which indicates that the setting process is faulty with respect to the applied tensile force. This can indeed monitor whether the predetermined pulling force was generated in the pulling mechanism, but there is no assurance that the predetermined tensile force has been applied to the Blindbefestiger.
  • the target-actual comparison can be used as the basis, is provided in the generic device according to DE 44 01 134 C2, outside of the tension mechanism of the setting device to measure the deflected by the blind fastener deflected and the tensile force opposite force component and to compare the measured values obtained in the target-actual comparison with an ideal curve. This also allows the setting process to be included in the monitoring and determine whether the forming process has expired in the desired way.
  • the serving for carrying out the method device comprises a recorded by a three-jaw chuck sleeve for the mandrel, which is fixedly connected to a driven by an electric motor ball screw.
  • the respective angle of rotation of the spindle of the recirculating ball mechanism is measured by means of a rotary angle measuring device while, on the other hand, the respective load of the electric motor is measured by means of a torque measuring device.
  • the measured rotation angle represents a size corresponding to the path traveled by the tension sleeve due to the slope ratio of the recirculating ball gear
  • the measured torque due to the slope ratio of the recirculating ball gear reproduces a size that of the tension sleeve respectively on the rivet mandrel applied traction corresponds.
  • the start of the measurement of the pull-off path of the tension sleeve begins when this has traveled a predetermined path, it being assumed that acts at this time, the preselected tensile force on the rivet mandrel.
  • this preselected tensile force is also identical to the actually acting on the rivet mandrel tensile force, or whether it is greater or smaller than the preselected tensile force remains open in this method.
  • this procedure since not the actual way of the rivet mandrel measured, but calculated from the measurement of the angle of rotation of the spindle of the ball screw the path of the tension sleeve and this is equated to the path of the rivet mandrel, this procedure then leads to an incorrect result, if at the beginning of the removal process between the tension sleeve and the rivet mandrel, a relative movement.
  • this method both with regard to the determination of the actual Ausziehweges the rivet mandrel, as well as with respect to the determination of the actually acting on this tensile force is an indirect or analog measurement method, which is also associated with the errors such measuring methods.
  • the invention is based on the object to provide a method for monitoring the processing of Blindbefestigern, on the one hand allows the most accurate determination of the breaking strength of Blindbefestigers, and on the other hand allows a statement regarding the proper sequence of the setting process.
  • this object is achieved by the following method steps. Determining, prior to the beginning of the first setting operation, a minimum traction force acting on the respective blind fastener from a number of sample setting processes whose size is between the traction force required to deform the blind fastener and that required to move the empty tensile sleeve; Extracting the blind fastener until it has a tensile force corresponding to the minimum tensile force; Starting the measuring process and setting a pulse counter clocked by a computer; Measuring the force exerted on it until after the break-away of the blind fastener as a function of the pulses emanating from the pulse counter; Converting the determined measured values into signals which can be fed to and processed by a computer; Storing the values of the generated signals together with the respective values of the pulse counter; Comparing the values of the generated signals and the respective values of the pulse counter with stored values of a reference setting process; Outputting and / or storing a signal documenting the result of the comparison
  • the actual measuring process is only started immediately when the force acting on the blind fastener has reached or exceeded a predetermined value (minimum tensile force), the influence of all interfering factors effective before reaching the minimum tensile force is kept away from the measuring process, i. these can not falsify the measuring process.
  • a predetermined value minimum tensile force
  • the theoretical beginning of the measuring process is independent of effective Störktoren on a parallels to the abscissa always in the same place, which also forms the starting point for the counter clocked by the computer, so that only the number of cycles is counted from this, starting from the minimum tensile force until the maximum force or the tear-off force of the blind fastener has been reached by the computer.
  • the measure of counting the number of time intervals instead of directly measuring the expansion of the blind fastener results in a surprisingly accurate assessment criterion for the setting process.
  • the accuracy of the results achievable with the method according to the invention offers the possibility of distinguishing material layers with different criteria for the setting process, for example of different thicknesses, by evaluating the measurement result from one another.
  • This can be achieved by different reference values for the minimum tensile force, the maximum force, for material layers of different thicknesses or the tear-off force and the pulse counter are stored and compared with the corresponding determined values of the respective material layer.
  • This can be achieved in a simple manner in that, in the case of a workpiece whose material layers have different thicknesses at the regions to be connected to one another, the respective processing values are compared with the corresponding actual values.
  • a release signal which is common for all setting processes or optionally one or more error signals can be output.
  • the error signal is forwarded according to a further embodiment of the method to a control point, which prevents an immediate initiation of a further setting process.
  • the inventive method can be carried out with commercially available Blindnietsetzierin, which are equipped with a pulling mechanism for applying a tensile force on the Blindbefestiger, wherein the force acting on the force during the setting process is determined by a force measuring device, and the mechanical stresses in a computer fed and from this processable signals are converted.
  • the force applied by the pulling mechanism can be measured within the Blindnietsetzeurss, or it can, as happens in the device according to DE 44 01 134 C2, outside the Pulling mechanism of Blindnietsetzasses the flowed through the blind fastener deflected and the tensile force opposite force component are measured.
  • the reference values for the rivet situation I are determined empirically, i. It is first carried out a certain number of trial-setting processes, wherein the minimum tensile force is chosen so that reached at Blindbefestiger setting processes, the minimum tensile force in any case, and thus the measurement process is not started.
  • the values resulting from the sample-setting processes are recorded in a coordinate system on whose abscissa the number of pulses originating from the computer and on the ordinate of which the force or pressure units are indicated.
  • the minimum tensile force is determined, and on the other hand, the reference values for the pressure or force are determined with the respectively associated number of pulses output by the computer and stored in this.
  • the determined reference values are represented in the coordinate system shown as FIG. 2 as a time / force diagram as reference curve I and the tolerance deviations permissible in the subsequent setting processes are defined, which are likewise stored in the computer. It should be noted that although the calculator from the time at which a tensile force is exerted by the pulling mechanism, sends count pulses, but they are so long neither detected nor included in the measurement until the minimum tensile force is reached.
  • the only important value in comparing the actual values with the reference values is the number of pulses counted from the counter during the setting process from reaching the minimum traction force to reaching the maximum force, which represents the time interval from reaching the minimum traction force to reaching the maximum force in the blind fastener , It is thus obvious that the conditions prevailing at the blind fastener before reaching the minimum tensile force can have no influence on the actual measuring process, and therefore the results derived from this are immune to all disturbing factors possibly prevailing before the minimum tensile force is reached.
  • curve K3 the distance between the minimum tensile force and reaching the maximum force in Blindbefestiger or reaching the Abrißkraft Blindbefestiger relatively large (60 pulses), while at the short lines shown Curve K4 is the distance between the minimum tensile force and the maximum force in the blind fastener or the achievement of the tear force at the blind fastener is relatively small (20 pulses).
  • FIG. 4 shows a rivet situation II, in which two parts of different thicknesses are to be fastened to a workpiece C, the part D having a greater thickness than the part E. Further, the total thickness of the parts to be joined together in the riveting situation II smaller than the total thickness of the parts to be joined together in the riveting situation I.
  • the remaining framework conditions stress of the materials of the workpieces and parts to be joined
  • the measuring process at the same minimum tensile force as in the rivet situation I start, including the Maximum force Pmax or the breaking force should have the same value as in the riveting situation I.
  • the time interval between reaching the minimum tensile force and the maximum force Pmax is not 40 pulses, as in the case of the riveting situation I, but 50 pulses.
  • This difference is by no means chosen arbitrarily, but is a consequence of the different total thickness of the material layers to be joined in each case. If the material layers to be joined together have different overall thicknesses under the same other boundary conditions, the time interval from reaching the minimum tensile force to reaching the maximum force changes depending on this, with a greater total thickness of the material layers the maximum force is reached earlier than, on the other hand, smaller total thickness of the material layers.
  • Fig. 6 shows the reference curve II for the connection of workpiece C with the two parts D and E together with the two curves K7 and K8.
  • the time interval from reaching the minimum traction force S until the maximum force is reached is greater than in the case of the reference curve II, whereas in the case of the curve K7, reaching the maximum force requires a total of 5 time intervals more than in the case of the curve K8. Since the total thickness of workpiece C and part D is greater than the total thickness of workpiece C and part E, it can be concluded from the curves K7 and K8 that in the constellation of the curve 7 the part D and in curve 8 the part E is not the workpiece C has been connected. Therefore, an error signal is output for both setting processes.
  • the method according to the invention also offers a monitoring option insofar as a reference curve is formed for each of the required possibilities and this or the relevant data is stored in the computer and retrieved sequentially for comparison with the respective actual values in accordance with the processing sequence or by a predetermined program can.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Insertion Pins And Rivets (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)
  • Slide Fasteners (AREA)
  • Sewing Machines And Sewing (AREA)

Claims (5)

  1. Procédé pour la surveillance de l'usinage d'une série de fixations aveugles à loger chacune dans un élément de traction, dans lequel une composante de force est mesurée pendant le procédé de positionnement et les signaux de mesures obtenus sont exploités sous forme de comparaison des valeurs consignes avec les valeurs réelles entre la fin d'un procédé précédent et le procédé de positionnement suivant, comprenant les étapes suivantes :
    - détermination, avant le début d'un premier procédé de positionnement, d'une force de traction minimale s'exerçant sur la fixation aveugle correspondante parmi un certain nombre de procédés de positionnement d'essai dont la grandeur est comprise entre la force de traction nécessaire pour la déformation de la fixation aveugle et la force de traction nécessaire pour le déplacement du manchon de traction vide ;
    - extraction de la fixation aveugle jusqu'à ce qu'une force de traction correspondant à la force de traction minimale s'exerce sur celle-ci ;
    - démarrage du processus de mesure et positionnement d'un compteur d'impulsions synchronisé par un ordinateur ;
    - mesure de la force de traction s'exerçant sur la fixation aveugle pendant son extraction jusqu'à l'obtention de la force maximale ou jusqu'à l'obtention de la force d'arrachement en fonction des impulsions émises par le compteur d'impulsions ;
    - conversion des valeurs de mesure déterminées en signaux transmissibles à un ordinateur et exploitables par celui-ci ;
    - mémorisation des valeurs des signaux générés conjointement avec les valeurs correspondantes du compteur d'impulsions ;
    - comparaison des valeurs des signaux générés et des valeurs correspondantes du compteur d'impulsions avec les valeurs d'un procédé de positionnement de référence déposées dans la mémoire ;
    - envoi et/ou mémorisation d'un signal indiquant le résultat de la comparaison.
  2. Procédé pour la surveillance de l'usinage de fixations aveugles selon la revendication 1, dans lequel, après l'usinage d'une première fixation aveugle, on procède à l'usinage d'une deuxième fixation aveugle dont les critères pour le procédé de positionnement sont différents du premier procédé de positionnement, comportant les étapes suivantes :
    - extraction de la deuxième fixation aveugle jusqu'à ce que la force de traction correspondant à la deuxième force de traction minimale déterminée pour ses critères de processus de positionnement s'exerce sur celle-ci ;
    - démarrage d'un deuxième procédé de mesure et positionnement d'un éventuel deuxième compteur d'impulsions synchronisé par l'ordinateur ;
    - mesure de la force de traction s'exerçant sur la deuxième fixation aveugle pendant son extraction jusqu'à l'obtention de la force maximale ou de la force d'arrachement en fonction des impulsions émises par le deuxième compteur d'impulsions ;
    - conversion des valeurs de mesure déterminées pendant le deuxième processus de mesure en signaux transmissibles à un ordinateur et exploitables par celui-ci ;
    - mémorisation des valeurs des deuxièmes signaux générés conjointement avec les valeurs correspondantes du deuxième compteur d'impulsions ;
    - comparaison des valeurs des deuxièmes signaux générés et des valeurs correspondantes du deuxième compteur d'impulsions avec les valeurs d'un deuxième procédé de positionnement de référence déposées dans la mémoire ;
    - envoi et/ou mémorisation d'un deuxième signal indiquant le résultat de la deuxième comparaison.
  3. Procédé pour la surveillance de l'usinage de fixations aveugles selon la revendication 2, caractérisé en ce que, après l'obtention du résultat de la deuxième comparaison, soit un signal de validation soit un signal d'erreur est émis.
  4. Procédé pour la surveillance de l'usinage de fixations aveugles selon la revendication 3, caractérisé en ce que le signal d'erreur est transmis à un poste de contrôle qui empêche le déclenchement immédiat d'un autre procédé de positionnement.
  5. Procédé selon la revendication 1 ou 2, caractérisé en ce que, en cas de procédé de positionnement exécuté en l'absence de fixation aveugle, le procédé de mesure n'est pas démarré.
EP04002257A 2003-02-06 2004-02-02 Méthode de contrôle de l'installation d'éléments de fixation aveugles Expired - Lifetime EP1447157B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10305285 2003-02-06
DE10305285A DE10305285A1 (de) 2003-02-06 2003-02-06 Verfahren zur Überwachung der Verarbeitung von Blindbefestigern

Publications (2)

Publication Number Publication Date
EP1447157A1 EP1447157A1 (fr) 2004-08-18
EP1447157B1 true EP1447157B1 (fr) 2006-10-18

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EP04002257A Expired - Lifetime EP1447157B1 (fr) 2003-02-06 2004-02-02 Méthode de contrôle de l'installation d'éléments de fixation aveugles

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EP (1) EP1447157B1 (fr)
AT (1) ATE342782T1 (fr)
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Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2390833B (en) * 2002-07-18 2005-09-14 Emhart Llc Method and apparatus for monitoring blind fastener setting
EP1750868A1 (fr) 2004-03-24 2007-02-14 Newfrey LLC Systeme de surveillance de rivet
US7802352B2 (en) 2005-04-13 2010-09-28 Newfrey Llc Monitoring system for fastener setting tool
DE102015115057B4 (de) * 2015-09-08 2017-07-13 Vvg-Befestigungstechnik Gmbh & Co. Verfahren zur Einrichtung eines handhaltbaren Nietgeräts

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5526669A (en) * 1994-05-20 1996-06-18 Hi-Shear Corporation Computer controlled pull gun system
DE4429225C2 (de) * 1994-08-18 1997-08-07 Weber Schraubautomaten Blindnietverfahren und -vorrichtung
US6240613B1 (en) * 1998-10-21 2001-06-05 Emhart Inc. Rivet setting tool cycle control

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Publication number Publication date
ATE342782T1 (de) 2006-11-15
DE10305285A1 (de) 2004-08-26
DE502004001758D1 (de) 2006-11-30
EP1447157A1 (fr) 2004-08-18

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