EP0096278A2 - Method of binding plate, and apparatus for doing so - Google Patents

Method of binding plate, and apparatus for doing so Download PDF

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Publication number
EP0096278A2
EP0096278A2 EP83105076A EP83105076A EP0096278A2 EP 0096278 A2 EP0096278 A2 EP 0096278A2 EP 83105076 A EP83105076 A EP 83105076A EP 83105076 A EP83105076 A EP 83105076A EP 0096278 A2 EP0096278 A2 EP 0096278A2
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EP
European Patent Office
Prior art keywords
bending
punch
sheet
sheet metal
during
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.)
Granted
Application number
EP83105076A
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German (de)
French (fr)
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EP0096278A3 (en
EP0096278B1 (en
Inventor
Eduard Hänni
Theo Frei
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Haemmerle AG Maschinenfabrik
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Haemmerle AG Maschinenfabrik
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Publication of EP0096278A2 publication Critical patent/EP0096278A2/en
Publication of EP0096278A3 publication Critical patent/EP0096278A3/en
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Publication of EP0096278B1 publication Critical patent/EP0096278B1/en
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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
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/006—Bending sheet metal along straight lines, e.g. to form simple curves combined with measuring of bends
    • 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
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/02—Bending sheet metal along straight lines, e.g. to form simple curves on press brakes without making use of clamping means
    • 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
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/02—Bending sheet metal along straight lines, e.g. to form simple curves on press brakes without making use of clamping means
    • B21D5/0209—Tools therefor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S72/00—Metal deforming
    • Y10S72/702—Overbending to compensate for springback

Definitions

  • the invention relates to a method for bending sheet metal with a punch and a die, into which the punch penetrates more or less depending on the bending angle.
  • the bending angle is determined by the height of the stamp edge with respect to the support points in the die.
  • this layer must lie within a tolerance of a few hundredths of a millimeter along the entire edge length, since a deviation of 0.04 mm already results in an error of 1 °. This requires a very precise maintenance of the lower end position of the bending die and the exact compensation of the machine and tool errors.
  • the proposal to determine the position of the punch by a height adjustment of the die base made a significant simplification and improvement, thereby eliminating all machine-side influences on the bending angle.
  • the desired angle can be easily and repeatedly determined by adjusting the height of the die base.
  • the aim of the invention is to remedy this disadvantage and to propose a method by means of which the penetration depth can be determined exactly in accordance with the angle to be achieved in such a way that the individual variable sheet properties are taken into account.
  • the proposed method of the type mentioned at the outset is characterized in that the size and the course of the bending force required during the deformation of the sheet metal piece are determined and used to determine the depth of penetration.
  • the device for performing the method has a bending punch and a die, into which the bending punch penetrates more or less depending on the bending angle.
  • a measuring device for continuously determining the forces occurring in the punch during the deformation of the sheet metal piece is present in the bending punch, which measuring device is connected to a computer that influences the feed of the punch.
  • the calculator can also be used to control the height of the Be coupled to the die bottom.
  • the bending angle a of the support edges is determined by the position of the edge 1 of the B iegest Zis 2 determined with respect to 3 and 4, the die 5. This position is given by the depth of penetration h.
  • the sheet 6 is bent with a radius 7, which differs depending on the sheet properties is, even with sheet metal of equal quality; which were manufactured by different manufacturers or at different times. It follows that with a constant penetration depth h of the punch 2, even when using the same die 5 with the support edges 3 and 4, the angle a does not remain the same, but changes. If the force curve is now recorded in function of the path, curves 10, 11 and 12 of FIG. 2 are obtained for different but qualitatively equivalent sheets, the path meaning the penetration depth h.
  • FIG. 3 shows the dependence of the bending angle a on the penetration depth for different sheets 10, 11 and 12.
  • a smaller depth of penetration is sufficient for sheet 12
  • a greater depth of penetration is required for sheet 11 than for sheet 10.
  • the size and the course of the required bending force are therefore measured in the bending punch and a computer is fed with the measured values, which individually determines the penetration depth for the sheet in question and influences the punch feed accordingly.
  • a sheet In use, a sheet is bent exactly to the desired angle during a test run and the size and the course of the bending force are stored in the punch in function of the penetration depth during the bending process. When bending another sheet, the force curve is compared with the stored force curve and the differences are used to correct the penetration depth.
  • a bending punch 20 which consists of an upper part 21 and a lower part 22.
  • the two parts 21 and 22 each have a cavity half 23 and 24 on their mutually facing sides which together form a cavity for receiving a measuring device 25.
  • This can, for example, as an electrical
  • a so-called strain gauge can also be used.
  • On the lower part 22 of the stamp a guide rail 26 is fastened on both sides with screws 27 to laterally support and guide the upper part 21.
  • the upper stamp part 21 is clamped at 28 in the usual manner in the stamp holder of a hydraulic press.
  • the pressure exerted on the upper stamp part 21 is passed on in this way via the measuring device 25 to the lower part 22 with a bending edge 29.
  • the measuring device determines the force currently exerted.
  • the measured values are registered and processed in a computer. This can either be the stroke of the stamp e.g. influence directly or, if a die with an adjustable die bottom is used, act on the adjusting device of the die bottom, which is then brought into the position which corresponds to the desired bending angle, taking into account the individual sheet properties.
  • the punch is divided into short pieces in the longitudinal direction, which is often necessary so that the entire length of the edge is driven evenly, it is sufficient it to provide a single stamp part with the measuring device mentioned, since the force distribution remains uniform along the entire edge length.
  • the described method and the device constitute a significant advance in sheet metal processing, in particular of thin sheets, which can be processed automatically with great precision, regardless of individual structural differences, without adjustment and correction work.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)

Abstract

Zum Blechbiegen mit einem Biegestempel (2) und einer Matrize (5) wird zunächst im Probelauf die während der Deformation eines Bleches (6) auftretende Biegekraft nach Grösse und Verlauf in Funktion der Eindringtiefe gemessen und registriert. Beim Biegen eines weiteren Bleches wird der Kräfteverlauf (11) mit dem gespeicherten Kräfteverlauf (10) verglichen. Mit Hilfe der vorhandenen Unterschiede wird die Eindringtiefe (h) korrigiert.For sheet metal bending with a punch (2) and a die (5), the bending force occurring during the deformation of a sheet (6) is first measured and registered in function of the depth of penetration in a test run. When another sheet is bent, the force curve (11) is compared with the stored force curve (10). The penetration depth (h) is corrected using the existing differences.

Description

Die Erfindung betrifft ein Verfahren zum Blechbiegen mit einem Biegestempel und einer Matrize, in welche der Biegestempel je nach Biegewinkel mehr oder weniger eindringt.The invention relates to a method for bending sheet metal with a punch and a die, into which the punch penetrates more or less depending on the bending angle.

In bekannter Weise wird der Biegewinkel durch die Höhenlage der Stempelkante bezüglich der Auflagestellen in der Matrize bestimmt. Bei Feinblechen muss diese Lage auf der ganzen Kantenlänge innerhalb einer Toleranz von wenigen hundertstel Millimeter liegen, da eine Abweichung von 0,04 mm bereits einen Fehler von 1° ergibt. Dies bedingt eine sehr genaue Einhaltung der unteren Endstellung des Biegestempels und die genaue Kompensation der Maschinen-und Werkzeugfehler.In a known manner, the bending angle is determined by the height of the stamp edge with respect to the support points in the die. In the case of thin sheets, this layer must lie within a tolerance of a few hundredths of a millimeter along the entire edge length, since a deviation of 0.04 mm already results in an error of 1 °. This requires a very precise maintenance of the lower end position of the bending die and the exact compensation of the machine and tool errors.

Eine wesentliche Vereinfachung und Verbesserung brachte der Vorschlag, die Lage des Stempels durch eine Höhenverstellung des Matrizenbodens zu bestimmen, wodurch die ganzen maschinenseitigen Einflüsse auf den Biegewinkel ausgeschaltet werden. Der gewünschte Winkel kann durch Höhenverstellung des Matrizenbodens einfach und wiederholbar bestimmt werden. Es besteht auch die Möglichkeit, durch programmgesteuerte oder NC-gesteuerte Verstellung des Matrizenbodens verschiedene Winkel hintereinander in einem Arbeitsgang zu biegen.The proposal to determine the position of the punch by a height adjustment of the die base made a significant simplification and improvement, thereby eliminating all machine-side influences on the bending angle. The desired angle can be easily and repeatedly determined by adjusting the height of the die base. There is also the possibility through programmge controlled or NC-controlled adjustment of the die bottom to bend different angles in succession in one operation.

Es hat sich aber gezeigt, dass trotz genauer Einstellung und Einhaltung der Eindringtiefe, z.B. durch genaue Höheneinstellung des Matrizenbodens, bei der Wiederholung des Biegevorganges an verschiedenen qualitativ gleichwertigen Blechstücken Abweichungen im Biegewinkel entstehen. Dies hängt damit zusammen, dass beim Biegevorgang im Blech nie die theoretische scharfe Kante entsteht, sondern diese mehr oder weniger abgerundet wird. Der Radius der Abrundung beeinflusst dabei den Biegewinkel in ganz erheblichem Masse. Andererseits variiert die Abrundung bei zwei theoretisch gleichwertigen Blechen je nach Fabrikation, Struktur etc.. Mit anderen Worten, zwei von verschiedenen Fabrikanten hergestellte qualitativ gleichwertige Blechstücke weisen nach der Bearbeitung an der gleichen Einrichtung und bei gleichbleibender Einstellung derselben, abweichende Biegewinkel auf, da die beim Biegen entstandenen Abrundungen voneinander verschieden sind. Dies ist ein grosser Nachteil, welcher bis jetzt nicht befriedigend beseitigt werden konnte.However, it has been shown that despite precise adjustment and compliance with the penetration depth, e.g. due to exact height adjustment of the die base, when repeating the bending process on different qualitatively equivalent pieces of sheet metal, deviations in the bending angle arise. This is due to the fact that the theoretical sharp edge never occurs in the sheet metal bending process, but is more or less rounded off. The radius of the rounding influences the bending angle to a considerable extent. On the other hand, the rounding of two theoretically equivalent sheets varies depending on the manufacture, structure, etc. In other words, two pieces of sheet metal of equal quality produced by different manufacturers have different bending angles after processing on the same device and with the same setting, since the at Bending fillets are different from each other. This is a major disadvantage, which has not yet been satisfactorily eliminated.

Ziel der Erfindung ist es, diesen Nachteil zu beheben und ein Verfahren vorzuschlagen, mittels welchem die Eindringtiefe exakt dem zu erzielenden Winkel entsprechend so bestimmt werden kann, dass dabei die individuellen variablen Blecheigenschaften Berücksichtigung finden.The aim of the invention is to remedy this disadvantage and to propose a method by means of which the penetration depth can be determined exactly in accordance with the angle to be achieved in such a way that the individual variable sheet properties are taken into account.

Erfindungsgemäss wurde nun erkannt, dass der Biegewinkel bei gleichbleibender Eindringtiefe des Biegestempels von der Grösse der während des Biegevorganges auftretenden Biegekräfte abhängig ist. Dementsprechend zeichnet sich das vorgeschlage Verfahren eingangs erwähnter Art dadurch aus, dass die Grösse und der Verlauf der während der Deformation des Blechstückes benötigten Biegekraft ermittelt und zur Bestimmung der Eindringtiefe verwendet wird.According to the invention, it has now been recognized that the bending angle is dependent on the magnitude of the bending forces occurring during the bending process, with the penetration depth of the bending punch remaining the same. Accordingly, the proposed method of the type mentioned at the outset is characterized in that the size and the course of the bending force required during the deformation of the sheet metal piece are determined and used to determine the depth of penetration.

Die Einrichtung zur Ausübung des Verfahrens weist einen Biegestempel und eine Matrize auf, in welche der Biegestempel je nach Biegewinkel mehr oder weniger eindringt. Erfindungsgemäss ist im Biegestempel eine Messeinrichtung zur kontinuierlichen Ermittlung der im Stempel während der Deformation des Blechstückes auftretenden Kräfte vorhanden, welche Messeinrichtung mit einem Rechner in Verbindung steht, der den Stempelvorschub beeinflusst. Der Rechner kann auch mit der Steuerung zur Höhenverstellung des Matrizenbodens gekoppelt sein.The device for performing the method has a bending punch and a die, into which the bending punch penetrates more or less depending on the bending angle. According to the invention, a measuring device for continuously determining the forces occurring in the punch during the deformation of the sheet metal piece is present in the bending punch, which measuring device is connected to a computer that influences the feed of the punch. The calculator can also be used to control the height of the Be coupled to the die bottom.

Auf beiliegender Zeichnung sind Diagramme zur Erläuterung des Verfahrens und eine beispielsweise Ausführung der Einrichtung schematisch dargestellt.On the accompanying drawing, diagrams for explaining the method and an example of the implementation of the device are shown schematically.

Es zeigen:

  • Fig. 1 eine schematische Skizze;
  • Fig. 2 ein Kräfteverlauf-Diagramm;
  • Fig. 3 ein weiteres Diagramm, welches den Zusammenhang zwischen Eindringtiefe und Biegewinkel für verschiedene Bleche zeigt;
  • Fig. 4 die schematische Darstellung eines Biegestempels in Seitenansicht und
  • Fig. 5 eine Stirnansicht zu Fig. 4.
Show it:
  • Fig. 1 is a schematic sketch;
  • 2 shows a force curve diagram;
  • 3 shows a further diagram which shows the relationship between the penetration depth and the bending angle for different sheets;
  • Fig. 4 is a schematic representation of a bending die in side view
  • 5 is an end view of FIG. 4.

Wie aus der schematischen Skizze in der Fig. 1 ersichtlich ist, wird der Biegewinkel a durch die Lage der Kante 1 des Biegestempels 2 bezüglich der Auflagekanten 3 und 4 der Matrize 5 bestimmt. Diese Lage wird durch die Eindringtiefe h gegeben. Beim Biegen wird aber das Blech 6 mit einem Radius 7 gebogen, welcher je nach Blecheigenschaften verschieden ist, und zwar auch bei qualitativ gleichwertigen Blechen; die durch verschiedene Hersteller oder zeitlich verschieden hergestellt wurden. Daraus folgt, dass bei gleichbleibender Eindringtiefe h des Stempels 2 auch bei der Verwendung der gleichen Matrize 5 mit den Auflagekanten 3 und 4 der Winkel a nicht gleich bleibt, sondern sich ändert. Wenn nun der Kräfteverlauf in Fuktion des Weges aufgezeichnet wird, so erhält man für verschiedene aber qualitativ gleichwertige Bleche die Kurven 10, 11 und 12 der Fig. 2, wobei mit dem Weg die Eindringtiefe h gemeint ist.As can be seen from the diagrammatic sketch in Fig. 1, the bending angle a of the support edges is determined by the position of the edge 1 of the B iegestempels 2 determined with respect to 3 and 4, the die 5. This position is given by the depth of penetration h. When bending, however, the sheet 6 is bent with a radius 7, which differs depending on the sheet properties is, even with sheet metal of equal quality; which were manufactured by different manufacturers or at different times. It follows that with a constant penetration depth h of the punch 2, even when using the same die 5 with the support edges 3 and 4, the angle a does not remain the same, but changes. If the force curve is now recorded in function of the path, curves 10, 11 and 12 of FIG. 2 are obtained for different but qualitatively equivalent sheets, the path meaning the penetration depth h.

Aus dem Diagramm ist ersichtlich, dass während des Biegevorganges bis zum Erreichen der Eindringtiefe h das Blech 11 weniger und das Blech 12 mehr Kraft benötigt als es zum Biegen des Bleches 10 erforderlich ist. Dies wirkt sich so aus, dass bis zum Erreichen der Eindringtiefe h das Blech 10 z.B. genau auf90° gebogen ist, das weichere Blech 11 etwas weniger, z.B. auf 910, während das härtere Blech 12 auf 89° gebogen wird.It can be seen from the diagram that during the bending process until the penetration depth h is reached, the sheet 11 requires less and the sheet 12 requires more force than is required to bend the sheet 10. This has an effect such that the penetration depth to reach the sheet 10, for example exactly h to 90 ° is bent, the softer sheet 11 slightly less, at 91 0, while the harder sheet metal 12 is bent to 89 ° for example.

In der Fig. 3 sind diese Verhältnisse veranschaulicht, indem die Abhängigkeit des Biegewinkels a von der Eindringtiefe für verschiedene Bleche 10, 11 und 12 gezeigt wird. Um bei allen drei Blechen 10, 11 und 12 den gewünschten Winkel 900 zu erreichen, genügt beim Blech 12 eine kleinere Eindringtiefe, während beim Blech 11 eine grössere Eindringtiefe als beim Blech 10 erforderlich ist. Es besteht also eine Funktion zwischen Biegewinkel a und Eindringtiefe h, welche vom jeweiligen Kräfteverlauf abhängt. Erfindungsgemäss wird deshalb die Grösse und der Verlauf der benötigten Biegekraft im Biegestempel gemessen und ein Rechner mit den Messwerten gespeist, welcher die Eindringtiefe für das betreffende Blech individuell bestimmt und den Stempelvorschub entsprechend beeinflusst.These relationships are illustrated in FIG. 3 by showing the dependence of the bending angle a on the penetration depth for different sheets 10, 11 and 12. In order to achieve the desired angle 90 0 for all three sheets 10, 11 and 12, a smaller depth of penetration is sufficient for sheet 12, while a greater depth of penetration is required for sheet 11 than for sheet 10. There is therefore a function between the bending angle a and the depth of penetration h, which depends on the respective course of forces. According to the invention, the size and the course of the required bending force are therefore measured in the bending punch and a computer is fed with the measured values, which individually determines the penetration depth for the sheet in question and influences the punch feed accordingly.

Im Gebrauch wird während eines Probelaufes ein Blech auf den gewünschten Winkel exakt gebogen und während des Biegevorganges die Grösse und der Verlauf der Biegekraft im Biegestempel in Fuktion der Eindringtiefe gespeichert. Beim Biegen eines weiteren Bleches wird der Kräfteverlauf mit dem gespeicherten Kräfteverlauf verglichen und die Unterschiede zur Korrektur der Eindringtiefe verwendet.In use, a sheet is bent exactly to the desired angle during a test run and the size and the course of the bending force are stored in the punch in function of the penetration depth during the bending process. When bending another sheet, the force curve is compared with the stored force curve and the differences are used to correct the penetration depth.

In den Fig. 4 und 5 ist ein Biegestempel 20 dargestellt, welcher aus einem oberen Teil 21 und aus einem unteren Teil 22 besteht. Die beiden Teile 21 und 22 weisen an ihren einander zugekehrten Seiten je eine Hohlraumhälfte 23 bzw. 24 auf, die zusammen einen Hohlraum zur Aufnahme einer Messeinrichtung 25 bilden. Diese kann z.B. als elektrische4 and 5, a bending punch 20 is shown, which consists of an upper part 21 and a lower part 22. The two parts 21 and 22 each have a cavity half 23 and 24 on their mutually facing sides which together form a cavity for receiving a measuring device 25. This can, for example, as an electrical

Kraftmessdose auf Piezoquarzbasis ausgebildet sein. Es kann auch ein soganannter strain gauge verwendet werden. Auf dem unteren Teil 22 des Stempels ist beidseitig je eine Führungsschiene 26 mit Schrauben 27 befestigt, um den oberen Teil 21 seitlich zu stützen und zu führen. Der Stempeloberteil 21 wird bei 28 in üblicher Weise in den Stempelhalter einer hydraulischen Presse eingespannt. Der auf den Stempeloberteil 21 ausgeübte Druck wird in dieser Weise über die Messeinrichtung 25 auf den Unterteil 22 mit Biegekante 29 weitergeleitet. Die Messeinrichtung ermittelt die momentan ausgeübte Kraft. Die Messwerte werden in einem Rechner registriert und verarbeitet. Dieser kann entweder den Hubweg des Stempels z.B. direkt beeinflussen oder, falls eine Matrize mit verstellbarem Matrizenboden verwendet wird, auf die Verstellvorrichtung des Matrizenbodens einwirken, welcher dann in die Stellung gebracht wird, welche dem gewünschten Biegewinkel entspricht, wobei die individuellen Blecheigenschaften berücksichtigt wurden.Load cell based on piezo quartz. A so-called strain gauge can also be used. On the lower part 22 of the stamp, a guide rail 26 is fastened on both sides with screws 27 to laterally support and guide the upper part 21. The upper stamp part 21 is clamped at 28 in the usual manner in the stamp holder of a hydraulic press. The pressure exerted on the upper stamp part 21 is passed on in this way via the measuring device 25 to the lower part 22 with a bending edge 29. The measuring device determines the force currently exerted. The measured values are registered and processed in a computer. This can either be the stroke of the stamp e.g. influence directly or, if a die with an adjustable die bottom is used, act on the adjusting device of the die bottom, which is then brought into the position which corresponds to the desired bending angle, taking into account the individual sheet properties.

Falls der Biegestempel in der Längsrichtung in kurze Stücke aufgeteilt ist, was oft erforderlich ist, damit auf der ganzen Kantenlänge gleichmässig gefahren wird, so genügt es, einen einzigen Stempelteil mit der erwähnten Messeinrichtung zu versehen, da die Kraftverteilung entlang der ganzen Kantenlänge gleichmässig bleibt.If the punch is divided into short pieces in the longitudinal direction, which is often necessary so that the entire length of the edge is driven evenly, it is sufficient it to provide a single stamp part with the measuring device mentioned, since the force distribution remains uniform along the entire edge length.

Das beschriebene Verfahren und die Vorrichtung bilden einen wesentlichen Fortschritt in der Blechbearbeitung, insbesondere von Feinblechen, die ohne Rücksicht auf individuelle Strukturverschiedenheiten ohne Einstell- und Korrekturarbeiten mit grosser Präzision automatisch bearbeitet werden können.The described method and the device constitute a significant advance in sheet metal processing, in particular of thin sheets, which can be processed automatically with great precision, regardless of individual structural differences, without adjustment and correction work.

Claims (8)

1. Verfahren zum Blechbiegen mit einem Biegestempel (2) und einer Matrize (5), in welche der Biegestempel (2) je nach Biegewinkel (a) mehr oder weniger eindringt, dadurch gekennzeichnet, dass die Grösse und der Verlauf der während der Deformation des Blechstückes benötigten Biegekraft ermittelt und zur Bestimmung der Eindringtiefe (h) verwendet wird.1. A method for bending sheet metal with a punch (2) and a die (5), in which the punch (2) penetrates more or less depending on the bending angle (a), characterized in that the size and the course of the deformation during the Sheet metal piece required bending force is determined and used to determine the depth of penetration (h). 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die im Biegestempel (2) während der Deformation des Bleches auftretende Biegekraft gemessen und registriert wird.2. The method according to claim 1, characterized in that the bending force occurring in the bending punch (2) during the deformation of the sheet is measured and registered. 3. Verfahren nach den Ansprüchen 1 und 2, dadurch gekennzeichnet, dass während eines Probelaufes ein Blech auf den gewünschten Winkel exakt gebogen wird und während des Biegevorganges die Grösse und der Verlauf der Biegekraft im Biegestempel in Funktion der Eindringtiefe gespeichert werden, worauf beim Biegen eines weiteren Bleches der Kräfteverlauf mit dem gespeicherten Kräfteverlauf verglichen und die Unterschiede zur Korrektur der Eindringtiefe verwendet werden.3. The method according to claims 1 and 2, characterized in that a sheet is bent exactly to the desired angle during a test run and the size and the course of the bending force in the punch are stored as a function of the penetration depth during the bending process, whereupon when bending a further sheet metal the force curve is compared with the stored force curve and the differences are used to correct the penetration depth. 4. Einrichtung zur Ausübung des Verfahrens nach Anspruch 1, welche einen Biegestempel (2, 20) und eine Matrize (5) aufweist, in welche der Biegestempel (2, 20) je nach Biegewinkel (a) mehr oder weniger eindringt, dadurch gekennzeichnet, dass im Biegestempel (20) eine Messeinrichtung (25) zur kontinuierlichen Ermittlung der im Stempel (20) während der Deformation des Blechstückes auftretenden Kräfte vorhanden ist, welche Messeinrichtung (25) mit einem Rechner in Verbindung steht, der - den Stempelvorschub (h) beeinflusst.4. Device for carrying out the method according to claim 1, which has a bending punch (2, 20) and a die (5) into which the bending punch (2, 20) penetrates more or less depending on the bending angle (a), characterized in that that there is a measuring device (25) in the bending punch (20) for the continuous determination of the forces occurring in the punch (20) during the deformation of the sheet metal piece, which measuring device (25) is connected to a computer which influences - the punch advance (h) . 5. Einrichtung nach Anspruch 4, dadurch gekennzeichnet, dass der Rechner mit einer Steuerung in Verbindung steht, welche die Stellung eines höhenverstellbaren Matrizenbodens bestimmt.5. Device according to claim 4, characterized in that the computer is connected to a controller which determines the position of a height-adjustable die bottom. 6. Einrichtung nach Anspruch 4, dadurch gekennzeichnet, dass der Biegestempel (20) einen oberen Teil (21) und einen gegenüber diesen beweglichen unteren Teil (22) aufweist, welche Teile (21, 22) an ihren einander zugekehrten Seiten je eine Hohlraumhälfte (23 bzw. 24) aufweisen, die zusammen einen Hohlraum zur Aufnahme der Messeinrichtung (25) bilden.6. Device according to claim 4, characterized in that the bending punch (20) has an upper part (21) and a movable relative to this lower part (22), which parts (21, 22) on their mutually facing sides each have a cavity half ( 23 or 24), which together form a cavity for receiving the measuring device (25). 7. Einrichtung nach den Ansprüchen 4 und 6, dadurch gekennzeichnet, dass die Messeinrichtung als elektrische Kraftmessdose auf Piezoquarzbasis ausgebildet ist.7. Device according to claims 4 and 6, characterized in that the measuring device is designed as an electrical load cell based on piezo quartz. 8. Einrichtung nach den Ansprüchen 4 und 6, dadurch gekennzeichnet, dass auf dem unteren Teil (22) des Stempels (20) beidseitig je eine Führungsschiene (26) befestigt ist, welche Schienen den beweglichen oberen Teil (22) des Stempels abstützen und führen.8. Device according to claims 4 and 6, characterized in that on the lower part (22) of the stamp (20) on each side a guide rail (26) is attached, which rails support and guide the movable upper part (22) of the stamp .
EP83105076A 1982-06-07 1983-05-21 Method of binding plate, and apparatus for doing so Expired EP0096278B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT2207/82 1982-06-07
AT0220782A AT374706B (en) 1982-06-07 1982-06-07 METAL BENDING METHOD AND BENDING DEVICE FOR EXERCISING THE METHOD

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EP0096278A2 true EP0096278A2 (en) 1983-12-21
EP0096278A3 EP0096278A3 (en) 1985-01-30
EP0096278B1 EP0096278B1 (en) 1987-03-25

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EP83105076A Expired EP0096278B1 (en) 1982-06-07 1983-05-21 Method of binding plate, and apparatus for doing so

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US (1) US4552002A (en)
EP (1) EP0096278B1 (en)
JP (1) JPS58218327A (en)
AT (1) AT374706B (en)
CA (1) CA1199562A (en)
DE (1) DE3370448D1 (en)
GB (1) GB2122121B (en)

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FR2601603A1 (en) * 1986-07-15 1988-01-22 Aripa Self-adapting folding-type bending method
WO1988001916A1 (en) * 1986-09-17 1988-03-24 Cincinnati Incorporated Adaptative control system for hydraulic press brake
EP0341211A2 (en) * 1988-05-03 1989-11-08 Haemmerle Ag Method of bending sheet metal
WO1995005905A1 (en) * 1993-08-27 1995-03-02 L.V.D. Company N.V. Adaptive folding

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DE3842009C1 (en) * 1988-11-22 1990-03-22 Kabelwerke Reinshagen Gmbh, 5600 Wuppertal, De
US5092026A (en) * 1989-09-22 1992-03-03 Molex Incorporated Crimp height monitor
US5201204A (en) * 1992-08-31 1993-04-13 William Hinterman Press counterbalance system
JP3363970B2 (en) * 1993-10-15 2003-01-08 株式会社小松製作所 Press brake ram position setting method and ram control device
NL1004193C2 (en) * 1996-04-01 1997-10-02 Sjoerd Meijer Method for processing metal sheet.
AT411022B (en) * 2002-02-27 2003-09-25 Juricek Christian Dipl Ing METHOD FOR REDUCING THE BENDING ANGLE ERRORS WHILE BENDING
US20040247925A1 (en) * 2003-06-06 2004-12-09 Cromwell Stephen Daniel Method and system for adjusting a curvature of a load plate based on a target load
FR2863785B1 (en) * 2003-12-11 2006-04-28 Airbus France DEVICE FOR CRIMPING A CONTACT ON A CABLE
ITPR20040088A1 (en) * 2004-12-13 2005-03-13 Schiavi Macchine Ind Spa METHOD AND DEVICE FOR THE DETERMINATION OF THE THICKNESS OR ELASTIC RETURN OF A PIECE FOLDED WITH A FOLDING PRESS.
DE102005012384A1 (en) 2005-03-17 2006-07-13 Siemens Ag Free bending of workpiece such as sheet useful in sheet bending operations involves construction of bending and correction curves and application of the corrections to further bending
CA2662109C (en) * 2006-08-31 2013-07-30 Nippon Steel Corporation Method of identification of cause of occurrence of springback, method of display of degree of effect of springback, method of identification of location of cause of occurence of springback, method of identification of position of measure against springback, apparatuses of these, and programs of these

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FR2601603A1 (en) * 1986-07-15 1988-01-22 Aripa Self-adapting folding-type bending method
WO1988001916A1 (en) * 1986-09-17 1988-03-24 Cincinnati Incorporated Adaptative control system for hydraulic press brake
EP0341211A2 (en) * 1988-05-03 1989-11-08 Haemmerle Ag Method of bending sheet metal
EP0341211A3 (en) * 1988-05-03 1990-10-24 Haemmerle Ag Method of bending sheet metal
WO1995005905A1 (en) * 1993-08-27 1995-03-02 L.V.D. Company N.V. Adaptive folding
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Also Published As

Publication number Publication date
CA1199562A (en) 1986-01-21
EP0096278A3 (en) 1985-01-30
ATA220782A (en) 1983-10-15
JPS58218327A (en) 1983-12-19
GB8300194D0 (en) 1983-02-09
GB2122121A (en) 1984-01-11
JPH0116566B2 (en) 1989-03-24
EP0096278B1 (en) 1987-03-25
US4552002A (en) 1985-11-12
AT374706B (en) 1984-05-25
GB2122121B (en) 1985-11-20
DE3370448D1 (en) 1987-04-30

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