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EP0642853B1 - Procédé pour joindre des plaques minces et dispositif pour la mise en oeuvre du procédé - Google Patents

Procédé pour joindre des plaques minces et dispositif pour la mise en oeuvre du procédé Download PDF

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Publication number
EP0642853B1
EP0642853B1 EP94113827A EP94113827A EP0642853B1 EP 0642853 B1 EP0642853 B1 EP 0642853B1 EP 94113827 A EP94113827 A EP 94113827A EP 94113827 A EP94113827 A EP 94113827A EP 0642853 B1 EP0642853 B1 EP 0642853B1
Authority
EP
European Patent Office
Prior art keywords
force
die
values
plates
minimum
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.)
Revoked
Application number
EP94113827A
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German (de)
English (en)
Other versions
EP0642853A1 (fr
Inventor
Viktor Dipl-Ing Malina
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.)
Tox Pressotechnik GmbH and Co KG
Original Assignee
Tox Pressotechnik GmbH and Co KG
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Filing date
Publication date
Family has litigation
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Application filed by Tox Pressotechnik GmbH and Co KG filed Critical Tox Pressotechnik GmbH and Co KG
Publication of EP0642853A1 publication Critical patent/EP0642853A1/fr
Application granted granted Critical
Publication of EP0642853B1 publication Critical patent/EP0642853B1/fr
Anticipated expiration legal-status Critical
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
    • B21D39/03—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders of sheet metal otherwise than by folding
    • B21D39/031—Joining superposed plates by locally deforming without slitting or piercing

Definitions

  • the invention is based on a method for connecting superimposed thin plates according to the preamble of claim 1 and on an apparatus for carrying out this method according to the preamble of claim 17.
  • Such processes are used in industrial mass production, for example in automobile construction. Monitoring the quality of the connection points or ensuring certain quality requirements for such connection points is therefore of particular importance in this process.
  • the occurrence of defects in the implementation of this method must be recognized and eliminated as quickly as possible in order to keep the rejects and machine downtimes as short as possible.
  • Such defects can be caused by a material breakage, in particular the stamp or the die. It is important to recognize every faulty connection point in order to sort out the corresponding part or to repeat a connection process.
  • a criterion for the quality of the connection or its lack is the remaining thickness of the remaining material in the area of the joint.
  • quality assurance consists in monitoring the stamp force with regard to a permissible maximum value and in measuring the residual material thickness after the connection has been made. As a result, only a part of the deficiencies that may occur is recorded. The subsequent measurement of the residual material thickness is also cumbersome and time-consuming.
  • the method according to the invention with the features of claim 1 and the device according to the invention with the features of claim 17 has the advantage that defects occurring to a much greater extent are detected and that no separate measurement of the residual material thickness has to be carried out.
  • the pressing force that is to say the punch or die force
  • the pressing force does not have to be absorbed in the form of a measuring curve against the working stroke during the entire joining process.
  • Every faulty connection is recognized.
  • Monitoring is carried out by comparison with predetermined maximum and minimum values. If the pressing force is below the specified minimum value, for example stamp or die break is displayed; on the other hand, if it exceeds the specified maximum value, this indicates plates that are too thick or material that is too hard to be joined.
  • the stripping force required to strip the connected plates from the punch is also measured. By measuring the stripping force, a lining of the material is determined, which is particularly important when using the invention in robot devices.
  • the pressing force is measured immediately after the squeezing process has ended. If the plates connected by the joining process at the joining point only have those for the Joining process characteristic residual floor thickness, the actual joining process is completed.
  • the pressing force assigned to the relevant working stroke is therefore particularly instructive for the joining process.
  • the measured forces are compared with a predetermined maximum value and a predetermined minimum value. If the measured value lies within the interval defined by the maximum and minimum value, the connection that has been made corresponds to the specified quality, but if it lies outside the interval, the connection is faulty. The comparison of the measured value with the interval is therefore sufficient to characterize the connection.
  • a signal when the predetermined maximum value is exceeded and when the predetermined minimum value is undershot, a signal is generated which can be used to control an optical and / or acoustic display device in order to draw attention to the presence of a defect.
  • the signal can also be used to control the interruption of the joining process, which can reduce waste and downtimes in production.
  • a signal is generated if the punch or the die does not cover the specified working stroke during the joining process.
  • the signal is advantageously a control signal with which an optical and / or acoustic display device is activated.
  • the signal can also be used to interrupt the joining process.
  • the maximum and minimum values are available in an electrical memory. This allows the values to be adjusted as required. There can also be several sets of values in the memory in order to quickly meet different requirements, for example when changing tools or materials.
  • the predetermined working stroke is available in a memory.
  • the working stroke can thus also be set using a computer having the memory.
  • the input of the values into the memory is protected. This ensures that changes can only be made by authorized persons.
  • the forces are measured at several joints at the same time, the values determined being evaluated by a common device.
  • the measured values determined are displayed optically.
  • the visual display makes it easier to distinguish between different types of errors so that the appropriate countermeasures can be taken.
  • the measured values determined can be saved in order to enable subsequent evaluation.
  • the measurement values are saved quality control, since the joining process can be checked in the event of later complaints.
  • the device according to the invention for carrying out the method with the features of claim 19 is advantageously adapted to the requirements of the method.
  • Force measuring devices are provided in the die holder, or in the punch holder, or on the stripper, preferably strain gauges or piezoelectric sensors are used, for example a piezo force transducer in the die holder, a piezo transverse dowel in the punch holder and a piezo measuring ring on the stripper.
  • a position detector ensures that the measurement is carried out exactly at the previously set working stroke.
  • the position indicator can advantageously be accommodated in a stamp stroke limiter.
  • the press 1 shown in FIG. 1 has a C-shaped frame 2, the lower part of which serves as a press table 3 on which the die holder 4 for the die 5 is arranged.
  • a stripping device 9 is arranged around the stamp holder 8 for stripping plates hanging on the stamp.
  • the punch 8 is moved up and down via a pressure cylinder 10 by a press drive 11 provided on the upper side of the C-shaped frame 2.
  • the die holder 4 there is a piezo force transducer with which the die force exerted by the die is determined.
  • a piezo transverse dowel 12 is provided in the stamp holder 7 to determine the stamping force exerted.
  • a piezo measuring ring 13 arranged around the pressure cylinder 10 is provided on the stripper 9 to determine the stripping force.
  • the pressure cylinder 10 has a position indicator 14, which activates the force measuring devices for a given stamp path to measure the stamp force and possibly the die force.
  • the position detector can also be included in the stroke limiter 15. The evaluation devices and the electrical connections between the evaluation devices and the measuring devices are not shown.
  • the diagram in FIG. 2 shows an example of the course of the stamp force as a function of the stamp path during a joining process.
  • the punch force increases steadily until the end of the joining process, but not linearly, but differently depending on the joining phase.
  • the various joining phases in the order of their sequence during the joining process, are first a combined sinking and pushing through, followed by upsetting and widthing, then filling in the upper contour of the die engraving, filling the ring channel of the die and finally backward extrusion to interlock the plate elements to be connected.
  • the stamp force is measured by the force measuring device on the value of the stamp path marked with I in the diagram, the measured value is marked with II.
  • An interval V is defined by the minimum value III and the maximum value IV.
  • the joining process that has taken place corresponds to the specified quality. If, on the other hand, the measured value VI exceeds the predetermined maximum value IV, the joining is faulty. Possible causes in this case are too thick a sheet, too much sheet layer, too high sheet strength or wrong tool combination. A faulty joining is also present if the measured value VII falls below the minimum value III. In this case the breakage of the punch or die, a missing sheet position or wrong tool combination can be the cause. Another possibility of an incorrect joining is indicated by the point marked with VIII. Here the position detector could not activate the force measuring device because the stamp did not cover the specified stamp path. The cause can either be a press force that is set too low, a press stroke that has not been carried out completely or the failure to reach the remaining floor thickness at the joining point.
  • the method according to the invention can also be used for methods with a rotary movement of the stamp.
  • the rotary movement is then determined by means of an angle encoder.
  • an acceleration measurement can also be carried out, for example by measuring the structure-borne noise generated during the stroke, in order to ensure compliance with a target value with a tolerance range. Accelerations that are too high lead to high material wear and an increased risk of tool breakage.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Presses (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)

Claims (23)

  1. Procédé pour joindre des plaques minces superposées, notamment des tôles ou des sections de plaques, par jonction à froid, où des parties des surfaces superposées des plaques ou des sections de plaques devant être jointes sont embouties et écrasées pendant une course de travail, par l'action commune d'un poinçon (8) et d'une matrice (5), avec ou sans étampage partiel des surfaces, caractérisé par le fait
    - que directement après l'opération d'écrasement, la force de pression exercée sur les plaques par le poinçon (8) comme force de poinçonnage ou par la matrice (5) comme force de matriçage est mesurée
    - et que la force de raclage, nécessaire pour dévêtir le poinçon (8) des plaques ou sections de plaques qui ont été jointes, est mesurée.
  2. Procédé selon la revendication 1, caractérisé par le fait que les valeurs mesurées (II, VI, VII) de la force de pression et de la force de raclage sont comparées à une valeur maximale donnée (IV) et à une valeur minimale donnée (III).
  3. Procédé selon la revendication 2, caractérisé par le fait qu'un signal est déclenché lorsque la force surveillée dépasse une valeur maximale donnée (IV) ou lorsqu'elle est inférieure à une valeur minimale donnée (III).
  4. Procédé selon une des revendications précédentes, caractérisé par le fait que le signal est déclenché lorsque le poinçon (8) ou la matrice (5) n'effectuent pas la course de travail prescrite (I) pour l'opération de jonction.
  5. Procédé selon la revendication 3 ou 4, caractérisé par le fait que le signal est un signal de commande, par lequel est commandé un dispositif de signalisation optique et/ou acoustique.
  6. Procédé selon la revendication 3, 4 ou 5, caractérisé par le fait que le signal est utilisé pour commander l'interruption d'une opération de jonction correspondante.
  7. Procédé selon la revendication 6, caractérisé par le fait qu'après une interruption, il n'est possible de reprendre le procédé qu'après avoir opéré un déverrouillage.
  8. Procédé selon une des revendications 2 à 7, caractérisé par le fait que les valeurs maximales (IV) et les valeurs minimales (III) ont été sauve-gardées et peuvent être lues dans une mémoire électrique.
  9. Procédé selon la revendication 8, caractérisé par le fait que les valeurs maximales et les valeurs minimales d'un dispositif de mesure des forces (12, 13) peuvent être réglées manuellement ou par l'ordinateur équipé de la mémoire.
  10. Procédé selon une des revendications 8 ou 9, caractérisé par le fait que plusieurs séries de valeurs maximales (IV) et de valeurs minimales (III) ont été sauve gardées dans la mémoire.
  11. Procédé selon une des revendications précédentes, caractérisé par le fait qu'une course de travail donnée (I) a été sauvegardée et peut être lue dans une mémoire électrique.
  12. Procédé selon la revendication 11, caractérisé par le fait que la course de travail prescrite (I) peut être réglée manuellement sur un dispositif de signalisation de la position (14) ou par l'ordinateur équipé de la mémoire.
  13. Procédé selon une des revendications 8 à 12, caractérisé par le fait que l'introduction des valeurs maximales (IV) et des valeurs minimales (III) et/ou de la course de travail prescrite (I) est protégée contre une lecture ou une perte.
  14. Procédé selon une des revendications précédentes, caractérisé par le fait que les forces sont mesurées simultanément à plusieurs points de jonction à froid et qu'elles sont exploitées par un dispositif d'exploitation commun.
  15. Procédé selon une des revendications précédentes, caractérisé par le fait que les valeurs mesurées (II, VI, VII) sont affichées visuellement.
  16. Procédé selon une des revendications précédentes, caractérisé par le fait que les valeurs mesurées (II, VI, VII) sont sauvegardées électriquement.
  17. Dispositif pour la mise en oeuvre du procédé selon une des revendications précédentes, avec une matrice (5) disposée dans une presse mécanique (I), et avec un poinçon (8) entraîné dans un mouvement de va-et-vient transversal par rapport aux plaques devant être jointes, caractérisé par le fait qu'il y a un dispositif de signalisation de la position (14), au moins un dispositif de mesure de la force de pression (12) et un dispositif de mesure de la force de raclage (15) du dévêtisseur (9).
  18. Dispositif selon la revendication 17, caractérisé par le fait que pour un mouvement linéaire ou rotatif, un manipulateur est relié au poinçon (8) par le mouvement.
  19. Dispositif selon la revendication 17 ou 18, caractérisé par le fait qu'un ou plusieurs piézoéléments servent de dispositif de mesure des forces (12, 13).
  20. Dispositif selon la revendication 17 ou 18, caractérisé par le fait qu'une ou plusieurs jauges extensométriques servent de dispositif de mesure des forces (12, 13).
  21. Dispositif selon une des revendications 17 à 20, caractérisé par le fait que le dispositif de mesure de la force de pression se trouve dans le mandrin de la matrice (5) ou sur la table (3) de la presse.
  22. Dispositif selon une des revendications 17 à 21, caractérisé par le fait que le dispositif de mesure de la force de pression (12) se trouve entre le poinçon (8) et le dispositif d'entraînement (10).
  23. Dispositif selon une des revendications 17 à 22, caractérisé par le fait que le dispositif de signalisation de la position (14) est logé dans un limiteur (15) de la course du poinçon.
EP94113827A 1993-09-15 1994-09-03 Procédé pour joindre des plaques minces et dispositif pour la mise en oeuvre du procédé Revoked EP0642853B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4331403 1993-09-15
DE4331403A DE4331403A1 (de) 1993-09-15 1993-09-15 Verfahren zum Verbinden dünner Platten und Vorrichtung zur Durchführung des Verfahrens

Publications (2)

Publication Number Publication Date
EP0642853A1 EP0642853A1 (fr) 1995-03-15
EP0642853B1 true EP0642853B1 (fr) 1997-12-10

Family

ID=6497820

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94113827A Revoked EP0642853B1 (fr) 1993-09-15 1994-09-03 Procédé pour joindre des plaques minces et dispositif pour la mise en oeuvre du procédé

Country Status (4)

Country Link
EP (1) EP0642853B1 (fr)
JP (1) JPH07195133A (fr)
CN (1) CN1111176A (fr)
DE (2) DE4331403A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8650730B2 (en) 2009-02-23 2014-02-18 Btm Corporation Clinching tool

Families Citing this family (15)

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DE19718576A1 (de) * 1997-05-05 1998-11-12 Hahn Ortwin Vorrichtung und Verfahren für mechanische Fügetechniken
DE19729368A1 (de) * 1997-07-09 1999-01-14 Ortwin Hahn Vorrichtung und Verfahren zum mechanischen Fügen von Blechen, Profilen und/oder Mehrblechverbindungen
US9015920B2 (en) 1997-07-21 2015-04-28 Newfrey Llc Riveting system and process for forming a riveted joint
US6276050B1 (en) 1998-07-20 2001-08-21 Emhart Inc. Riveting system and process for forming a riveted joint
DE19826290B4 (de) * 1998-02-25 2005-09-01 Salzgitter Ag Verfahren zur Herstellung von partiellen Doppelblech- oder Mehrfachblechstrukturen
DE10308845B4 (de) * 2002-02-27 2007-01-18 Prokos Produktions-Kontroll-System Gmbh Verfahren zur Überwachung von Umformvorgängen
DE10312458B3 (de) * 2003-03-20 2004-08-19 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Verfahren und Vorrichtung zur Bestimmung des Verpressungsgrades einer formschlüssigen Verbindung zwischen wenigstens zwei Bauteilen
DE10327886B4 (de) * 2003-06-20 2007-11-29 Prokos Produktions-Kontroll-System Gmbh Verfahren und Vorrichtung zur Ermittlung der Bodendicke von Clinchpunkten einer Clinchverbindung
US20080289169A1 (en) 2007-05-25 2008-11-27 Tox Pressotechnik Gmbh & Co. Kg Method and apparatus for joining plates
US9027220B2 (en) 2012-08-07 2015-05-12 Newfrey Llc Rivet setting machine
CN103302124B (zh) * 2013-04-27 2015-08-19 太原科技大学 一种带安全保护的热反挤压冲头装置
US10328481B2 (en) 2014-03-18 2019-06-25 Btm Company Llc Clinching punch and apparatus
CN108297527B (zh) * 2018-03-28 2024-05-28 昆明理工大学 一种用于压印连接三明治结构中泡沫金属夹层的整形锤预压装置及处理方法
WO2022113023A1 (fr) * 2020-11-26 2022-06-02 Manz Italy S.R.L. Procédé et appareil d'assemblage pour assembler un dispositif de stockage d'énergie à l'aide d'une action de soudage à impulsions
DE102022210503A1 (de) * 2022-10-05 2024-04-11 Volkswagen Aktiengesellschaft Messvorrichtung und Messsystem für ein Blechbearbeitungswerkzeug und damit ausgerüstetes Blechbearbeitungswerkzeug

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DE1246652B (de) * 1962-02-10 1967-08-10 Mueller Fritz Stufenpresse
DE3241063A1 (de) * 1982-11-06 1984-05-10 Siegfried Ing.(grad.) 7321 Börtlingen Schwarz Verfahren und einrichtung zur ueberwachung der kraefte an stanzpressen o. dgl.
DE3532899A1 (de) * 1985-09-14 1987-03-26 Eugen Rapp Verfahren und vorrichtung zum verbinden von platten durch stanznocken
DE3532900A1 (de) * 1985-09-14 1987-03-26 Eugen Rapp Verfahren und vorrichtung zum verbinden duenner platten
SE8800407D0 (sv) * 1988-02-05 1988-02-05 Cerac Sa A method for joining two or several overlaying sheet formed members together, metal or non-metal, and an apparatus for carrying out said method
ATE98160T1 (de) * 1989-11-22 1993-12-15 Cybelec Sa Verfahren zur steuerung der bahn eines stanzwerkzeugs.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8650730B2 (en) 2009-02-23 2014-02-18 Btm Corporation Clinching tool

Also Published As

Publication number Publication date
DE4331403A1 (de) 1995-03-16
JPH07195133A (ja) 1995-08-01
EP0642853A1 (fr) 1995-03-15
DE59404771D1 (de) 1998-01-22
CN1111176A (zh) 1995-11-08

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