EP2656937B1 - Method for introducing a deformation in a plate-like workpiece - Google Patents

Method for introducing a deformation in a plate-like workpiece Download PDF

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Publication number
EP2656937B1
EP2656937B1 EP13163556.7A EP13163556A EP2656937B1 EP 2656937 B1 EP2656937 B1 EP 2656937B1 EP 13163556 A EP13163556 A EP 13163556A EP 2656937 B1 EP2656937 B1 EP 2656937B1
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EP
European Patent Office
Prior art keywords
workpiece
tool
reshaping
folded
tool holder
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.)
Not-in-force
Application number
EP13163556.7A
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German (de)
French (fr)
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EP2656937A1 (en
Inventor
Thomas Bronnhuber
Alexander Tatarczyk
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.)
Trumpf Werkzeugmaschinen SE and Co KG
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Trumpf Werkzeugmaschinen SE and Co KG
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Publication of EP2656937A1 publication Critical patent/EP2656937A1/en
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Publication of EP2656937B1 publication Critical patent/EP2656937B1/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
    • B21D35/00—Combined processes according to or processes combined with methods covered by groups B21D1/00 - B21D31/00
    • B21D35/001—Shaping combined with punching, e.g. stamping and perforating
    • 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
    • B21D19/00—Flanging or other edge treatment, e.g. of tubes
    • B21D19/08—Flanging or other edge treatment, e.g. of tubes by single or successive action of pressing tools, e.g. vice jaws
    • 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
    • B21D28/00—Shaping by press-cutting; Perforating
    • B21D28/02—Punching blanks or articles with or without obtaining scrap; Notching
    • B21D28/10—Incompletely punching in such a manner that the parts are still coherent with the work
    • 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
    • B21D5/06—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles

Definitions

  • the invention relates to a method for introducing a deformation into a plate-like workpiece, in particular to a method for introducing a downwardly directed deformation into a section of a workpiece resting on a workpiece support of a machine tool.
  • Another possibility is to punch the contours of the components first and then the necessary To bring in transformations. For this, a complex handling of the components is required, so that this procedure is associated with great effort.
  • pamphlet DE 10 2006 015 148 A1 basically shows a method in which transformations of a sheet metal tab take place on one side of a sheet metal surface.
  • a tab preform is raised and, together with another tab, which is essentially mirror-symmetrical, fastening projections are formed, which have a substantially arrow-shaped outer contour.
  • FIG. 1 An example of a machine tool 1 for cutting and / or forming plate-like workpieces is shown.
  • the machine tool here is a punching machine, but may alternatively also be, for example, a punching / laser cutting machine.
  • the machine tool 1 has a C-frame 2, in which a workpiece support designed as a machine table 3 is provided, which serves for mounting a workpiece to be machined in the form of a sheet 4.
  • the upper side of the workpiece support 3 serves as a horizontal support plane 5 for the sheet 4 to be processed.
  • the support plane 5 runs parallel to an xy plane in the in Fig. 1 shown coordinate system.
  • a workpiece moving device 6 the clamped by means of collets 7 sheet 4 in the support plane 5 of the machine table 3 is movable.
  • an upper tool holder 8 is arranged, in which a tool punch 9 is recorded. Furthermore, a lower tool holder 10 is provided at the front end of the lower leg of the C-frame 2, in which a tool die 11 is received. The tool punch 9 and the tool die 11 form a tool 12 for the separating and / or deforming machining of the sheet 4.
  • a punch drive 13 and a die drive 14 each form a drive unit of the machine tool 1 in the form of linear drives.
  • the punch drive 13 By means of the punch drive 13, the upper tool holder 8 with the attached tool die 9 along a lifting axis 15 relative to the machine table 3 can be raised and lowered.
  • the lower tool holder 10 with the tool die 11 accommodated therein can be raised and lowered by means of the die drive 14 along the lifting axis 15 relative to the machine table 3.
  • the upper tool holder 8 and the lower tool holder 10 by means of a rotary drive not shown about an identical with the lifting axis 15 tool axis of rotation 16 and each angle adjustment is adjustable.
  • a tool magazine 17 is provided with other tools 12.
  • the tools 12 contained in the tool magazine 17 are each held by a tool cassette 18 and can be attached to the upper tool holder 8 and the lower tool holder 10 as required for machining the sheet 4.
  • the drives of the machine tool 1 are controlled by means of a control device 21.
  • the control device 21 has a memory device 19 for storing program and tool data and a control device 20 for controlling both the lifting, lowering and Rotary movements of the upper tool holder 8 and the lower tool holder 10 as well as for controlling the tool moving device 6 based on the stored data.
  • Fig. 2 shows a schematic representation of several processing steps on the sheet 4, which in the support plane 5 (FIG. Fig. 1 ), from the side.
  • View A shows the sheet 4 before processing.
  • the sheet 4 rests on the machine table 3 of the machine tool 1, which is not shown in this figure, and is moved by the workpiece moving device 6 such that a region of the sheet 4 to be machined in the area of the upper tool holder 8 and lower tool holder 10 of the machine tool 1 (FIG. Fig. 1 ) comes to rest.
  • FIG. Fig. 1 In view B is shown as a bending tool, consisting of an upper Abkantwerkmaschine 25, which in the upper tool holder 8 of the machine tool 1 (FIG. Fig. 1 ) is received, and a lower Abkantwerkmaschine 26, which is received in the lower tool holder 10 of the machine tool 1, is used.
  • the upper Abkantwerkmaschine 25 is moved down and the lower Abkanttechnikmaschine 26 is moved up to perform a Abkant Kunststoff.
  • ⁇ The angle ⁇ is here 45 °, but may alternatively, according to a Deutschenganden downward Forming be predetermined, so that the downward forming does not collide with the machine table 3.
  • a lower bending tool 26 is received in the lower tool holder and the lower tool holder 10 or the lower Abkanttechnikmaschine 26 is provided with a sprung ejector, which is biased upward.
  • the sprung ejector surrounds the lower Abkantwerkmaschine 26.
  • the lower Abkantwerkmaschine 26 is received in the lower tool holder 10 so that the lower Abkanttechnikmaschine 26 projects beyond the support plane 5 of the sheet 4.
  • the sprung ejector is arranged in its uppermost position so that the spring-loaded ejector projects beyond the lower bending tool 26 and presses the sheet upward, above the support plane 5.
  • the sheet 4 thus slides in a movement by means of the workpiece moving device 6 on the sprung ejector and has no contact with the lower Abkantwerkmaschine 26 so that it is not damaged by the lower Abkantwerkmaschine 26.
  • the upper Abkantwerkmaschine 25 is driven by the upper tool holder 8 down and the sheet 4 is pressed against the biasing force of the sprung ejector down, the lower tool holder, and thus the lower Abkantwerkmaschine 26 is fixed immovably.
  • the relative movement of the upper Abkanttechnikmaschines 25 and the lower Abkanttechnikmaschines 26 of the portion of the sheet 4 by the predetermined angle ⁇ bent upward so that the bent workpiece portion 22 relative to the remaining portion 23 of the sheet 4 is formed, and the bent workpiece portion 22 relative to the Remaining portion 23 is raised.
  • the angle ⁇ is here also 45 °, but may alternatively, according to a be introduced to be introduced downward forming, so that the downward deformation does not collide with the machine table 3 or the sprung ejector.
  • View C shows a forming step as a further step of the process.
  • a forming tool consisting of an upper tool holder 8 which is inserted into the upper tool holder 8, and a lower forming tool 28 which is inserted into the lower tool holder 10, is used in this case.
  • the upper forming tool 27 is moved down and the lower forming tool 28 is moved upwards, so that with respect to the folded workpiece portion 22 downward forming 24 is formed in a single stroke. Alternatively, several strokes, possibly performed with other forming tools. Since the angle ⁇ , by which the bent workpiece section 22 is raised, is predetermined in such a size that the downwardly directed deformation 24 is not connected to the machine table 3 (FIG. Fig.
  • a free cutting step is shown as an optional further processing step in which the beveled workpiece section 22 with the downwardly directed deformation 24 is separated from the remaining section 23 of the sheet 4.
  • a separating punch 29 is loaded in the upper tool holder 8 and in the lower tool holder a die corresponding to the die 29 is replaced.
  • the separating stamp 29 is moved down and the bent workpiece portion 22 is separated at the fold. Alternatively, the separation can also be done next to the fold.
  • Fig. 2 the individual processing steps of the method are shown schematically.
  • the method can be applied, for example, to the production of components consisting of the folded workpiece sections 22, which are separated from a metal strip.
  • Fig. 3 shows an alternative application of the method to a sheet 4, in which the portion of the workpiece which is separated, lies in the interior of a surface of the sheet 4.
  • the section has one, as in Fig. 3 shown outer contour 30, which is separated in a previous step by a suitable punching tool on several sides (here three) of the portion of the residual portion 23.
  • Fig. 4 shows the result of the Abkant Kunststoffs in which the portion on a side which is not separated from the remaining portion 23, analogous to that in Fig. 2 shown Abkant vinegar, is folded.
  • the bent workpiece portion 22 is formed with the outer contour 30th
  • the downward forming 24 was then introduced.
  • the bent workpiece portion 22 is not separated from the remainder portion 23 in the free cutting step, but the folded side of the folded workpiece portion 22 is machined to form a micro-joint composite 31.
  • the bent workpiece portion 22 later separated, for example, by hand from the remaining portion 23.
  • a free cutting by punching or laser processing is also possible here.
  • the bent workpiece portion 22 is formed in the present embodiment on one side of the outer contour 30. A transformation of several sides or the inner surface of the formed workpiece section 22 and / or a punching operation are alternatively also possible.
  • the separation of the sides of the portion from which the beveled workpiece portion 22 formed from the residual sheet 23 may alternatively, instead of punching, also by a laser machining done. In this case, a wide variety of outer contours 30 can then be generated flexibly. Also, the complete separation of the folded workpiece portion 22 of the remaining portion 23 or the creation of the micro-joint composite can be done by means of a laser processing.
  • the preparation of the downward forming 24 is usually made by an upper forming tool 27 and a lower forming tool 28, which are different from the upper Abkanttechnikmaschine 25 and the lower Abkanttechnikmaschine 26.
  • an upper forming tool 27 and a lower forming tool 28 which are different from the upper Abkanttechnikmaschine 25 and the lower Abkanttechnikmaschine 26.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Punching Or Piercing (AREA)
  • Laser Beam Processing (AREA)

Description

Die Erfindung betrifft ein Verfahren zum Einbringen einer Umformung in ein plattenartiges Werkstück, insbesondere ein Verfahren zum Einbringen einer nach unten gerichteten Umformung in einen Abschnitt eines auf einer Werkstückauflage einer Werkzeugmaschine liegenden Werkstücks.The invention relates to a method for introducing a deformation into a plate-like workpiece, in particular to a method for introducing a downwardly directed deformation into a section of a workpiece resting on a workpiece support of a machine tool.

Bei der Anfertigung von Bauteilen aus plattenartigen Werkstücken, insbesondere aus Blech, gibt es die Aufgabenstellung, dass Bauteile angefertigt werden müssen, die eine spezielle Außenkontur und Umformungen auf beide Seiten der Blechoberfläche aufweisen müssen.In the manufacture of components from plate-like workpieces, in particular sheet metal, there is the task that components must be made, which must have a special outer contour and transformations on both sides of the sheet surface.

Es sind Verfahren zur Herstellung solcher Bauteile bekannt, bei denen die Teile über Folgeverbundwerkzeuge hergestellt werden. Ein solches Folgeverbundwerkzeug ist aber unflexibel und für kleinere Stückzahlen oder Losgrößen nicht wirtschaftlich.There are known methods for producing such components, in which the parts are produced by means of progressive dies. However, such a progressive tool is inflexible and not economical for smaller quantities or batch sizes.

Eine weitere Möglichkeit besteht darin, die Konturen der Bauteile erst zu Stanzen und im Anschluss daran die erforderlichen Umformungen einzubringen. Dazu ist ein aufwendiges Handling der Bauteile erforderlich, so dass auch diese Vorgehensweise mit großem Aufwand verbunden ist.Another possibility is to punch the contours of the components first and then the necessary To bring in transformations. For this, a complex handling of the components is required, so that this procedure is associated with great effort.

Um solche Bauteile wirtschaftlich herzustellen, ist eine Herstellung auf Stanzmaschinen oder kombinierten Stanz-Lasermaschinen wünschenswert. Dabei besteht aber insbesondere bei offenen und/oder filigranen Umformungen, die durch ein Umformen nach unten hergestellt werden, das Problem, dass diese Umformungen bei einem Bewegen des Blechs über eine Werkstückauflage der Stanz- oder Stanz-Lasermaschine durch eine Kollision damit verformt werden, so dass das Bauteil unbrauchbar wird.To produce such components economically, a production on punching machines or combined punch laser machines is desirable. However, in particular in the case of open and / or filigree deformations which are produced by forming downwards, there is the problem that these deformations are deformed when the sheet is moved over a workpiece support of the punching or punching laser machine as a result of a collision with it that the component becomes unusable.

Druckschrift DE 10 2006 015 148 A1 zeigt grundsätzlich ein Verfahren, in dem Umformungen einer Blechlasche auf einer Seite einer Blechoberfläche erfolgen. Eine Laschenvorform wird hochgestellt und zusammen mit einer weiteren Lasche, die im Wesentlichen spiegelsymmetrisch ausgebildet ist, werden Befestigungsvorsprünge gebildet, die eine im Wesentlichen pfeilförmige Außenkontur aufweisen.pamphlet DE 10 2006 015 148 A1 basically shows a method in which transformations of a sheet metal tab take place on one side of a sheet metal surface. A tab preform is raised and, together with another tab, which is essentially mirror-symmetrical, fastening projections are formed, which have a substantially arrow-shaped outer contour.

Es ist nun Aufgabe der Erfindung, ein Verfahren bereitzustellen, bei dem die vorangehend genannten Probleme gelöst werden und insbesondere eine wirtschaftliche und prozesssichere Herstellung von Bauteilen mit Umformungen in Richtung der Unterseite eines Werkstücks sichergestellt wird.It is an object of the invention to provide a method in which the above-mentioned problems are solved and in particular an economical and process-reliable production of components with deformations in the direction of the underside of a workpiece is ensured.

Die Aufgabe wird durch ein Verfahren gemäß Anspruch 1 gelöst. Weiterentwicklungen des Verfahrens sind in den abhängigen Ansprüchen enthalten.The object is achieved by a method according to claim 1. Further developments of the method are contained in the dependent claims.

Die Erfindung wird nun anhand der Beschreibung unter Bezugnahme auf die angefügten Zeichnungen erklärt.The invention will now be explained with reference to the description with reference to the attached drawings.

Insbesondere zeigt:

Fig. 1
eine Stanzmaschine als ein Ausführungsbeispiel einer Werkzeugmaschine;
Fig. 2
eine schematische Darstellung von mehreren Bearbeitungsschritten eines Werkstücks von der Seite;
Fig. 3
eine schematische Darstellung des Werkstück mit einem an drei Seiten getrennten Werkstückabschnitt von schräg oben;
Fig. 4
eine schematische Darstellung des Werkstücks von Fig. 2 mit dem hochgestellten Werkstückabschnitt; und
Fig. 5
eine schematische Darstellung des Werkstücks von Fig. 3 mit einer nach unten gerichteten Umformung und einem Micro-Joint-Verbund zwischen dem hochgestellten Werkstückabschnitt und einem Restabschnitt.
In particular:
Fig. 1
a punching machine as an embodiment of a machine tool;
Fig. 2
a schematic representation of several processing steps of a workpiece from the side;
Fig. 3
a schematic representation of the workpiece with a separate workpiece on three sides of obliquely from above;
Fig. 4
a schematic representation of the workpiece of Fig. 2 with the raised workpiece section; and
Fig. 5
a schematic representation of the workpiece of Fig. 3 with a downward forming and a micro-joint composite between the raised workpiece portion and a residual portion.

In Fig. 1 ist ein Beispiel für eine Werkzeugmaschine 1 zum Schneiden und/oder Umformen von plattenartigen Werkstücken gezeigt. Die Werkzeugmaschine ist hier eine Stanzmaschine, kann jedoch alternativ auch beispielsweise eine Stanz-/Laserschneidmaschine sein. Die Werkzeugmaschine 1 weist einen C-Rahmen 2 auf, in dem eine als Maschinentisch 3 ausgebildete Werkstückauflage vorgesehen ist, welche zur Lagerung eines zu bearbeitenden Werkstücks in Form eines Bleches 4 dient. Die Oberseite der Werkstückauflage 3 dient als eine horizontale Auflageebene 5 für das zu bearbeitende Blech 4. Die Auflageebene 5 verläuft parallel zu einer x-y-Ebene in dem in Fig. 1 gezeigten Koordinatensystem. Mittels einer Werkstückbewegungseinrichtung 6 ist das über Spannzangen 7 eingespannte Blech 4 in der Auflageebene 5 des Maschinentischs 3 bewegbar.In Fig. 1 An example of a machine tool 1 for cutting and / or forming plate-like workpieces is shown. The machine tool here is a punching machine, but may alternatively also be, for example, a punching / laser cutting machine. The machine tool 1 has a C-frame 2, in which a workpiece support designed as a machine table 3 is provided, which serves for mounting a workpiece to be machined in the form of a sheet 4. The upper side of the workpiece support 3 serves as a horizontal support plane 5 for the sheet 4 to be processed. The support plane 5 runs parallel to an xy plane in the in Fig. 1 shown coordinate system. By means of a workpiece moving device 6, the clamped by means of collets 7 sheet 4 in the support plane 5 of the machine table 3 is movable.

An dem vorderen Ende des oberen Schenkels des C-Rahmens 2 ist eine obere Werkzeugaufnahme 8 angeordnet, in welcher ein Werkzeugstempel 9 aufgenommen ist. Des Weiteren ist an dem vorderen Ende des unteren Schenkels des C-Rahmens 2 eine untere Werkzeugaufnahme 10 vorgesehen, in der eine Werkzeugmatrize 11 aufgenommen ist. Der Werkzeugstempel 9 und die Werkzeugmatrize 11 bilden ein Werkzeug 12 zum trennenden und/oder umformenden Bearbeiten des Blechs 4.At the front end of the upper leg of the C-frame 2, an upper tool holder 8 is arranged, in which a tool punch 9 is recorded. Furthermore, a lower tool holder 10 is provided at the front end of the lower leg of the C-frame 2, in which a tool die 11 is received. The tool punch 9 and the tool die 11 form a tool 12 for the separating and / or deforming machining of the sheet 4.

Ein Stempelantrieb 13 und ein Matrizenantrieb 14 bilden jeweils eine Antriebseinheit der Werkzeugmaschine 1 in Form von Linearantrieben. Mittels des Stempelantriebs 13 ist die obere Werkzeugaufnahme 8 mit dem daran angebrachten Werkzeugstempel 9 entlang einer Hubachse 15 gegenüber dem Maschinentisch 3 anhebbar und senkbar. Die untere Werkzeugaufnahme 10 mit der darin aufgenommenen Werkzeugmatrize 11 ist mittels des Matrizenantriebs 14 entlang der Hubachse 15 gegenüber dem Maschinentisch 3 anhebbar und senkbar. Darüber hinaus sind die obere Werkzeugaufnahme 8 und die untere Werkzeugaufnahme 10 mittels eines nicht gezeigten Drehantriebs um eine mit der Hubachse 15 identischen Werkzeugdrehachse 16 verdrehbar und jede Winkeleinstellung ist einstellbar.A punch drive 13 and a die drive 14 each form a drive unit of the machine tool 1 in the form of linear drives. By means of the punch drive 13, the upper tool holder 8 with the attached tool die 9 along a lifting axis 15 relative to the machine table 3 can be raised and lowered. The lower tool holder 10 with the tool die 11 accommodated therein can be raised and lowered by means of the die drive 14 along the lifting axis 15 relative to the machine table 3. In addition, the upper tool holder 8 and the lower tool holder 10 by means of a rotary drive not shown about an identical with the lifting axis 15 tool axis of rotation 16 and each angle adjustment is adjustable.

An der Werkstückbewegungseinrichtung 6 ist ein Werkzeugmagazin 17 mit weiteren Werkzeugen 12 vorgesehen. Die in dem Werkzeugmagazin 17 enthaltenen Werkzeuge 12 werden jeweils von einer Werkzeugkassette 18 gehalten und sind nach Bedarf zur Bearbeitung des Blechs 4 an der oberen Werkzeugaufnahme 8 bzw. der unteren Werkzeugaufnahme 10 anbringbar. Zur Bearbeitung des Blechs 4 und bei einem Werkzeugwechsel werden die Antriebe der Werkzeugmaschine 1 mit Hilfe einer Steuerungsvorrichtung 21 gesteuert. Die Steuerungsvorrichtung 21 weist eine Speichereinrichtung 19 zum Speichern von Programm- und Werkzeugdaten und eine Steuereinrichtung 20 zum Steuern sowohl der Hub-, Senkund Drehbewegungen der oberen Werkzeugaufnahme 8 und der unteren Werkzeugaufnahme 10 als auch zum Steuern der Werkzeugbewegungseinrichtung 6 basierend auf den gespeicherten Daten auf.At the workpiece moving device 6, a tool magazine 17 is provided with other tools 12. The tools 12 contained in the tool magazine 17 are each held by a tool cassette 18 and can be attached to the upper tool holder 8 and the lower tool holder 10 as required for machining the sheet 4. For machining the sheet 4 and during a tool change, the drives of the machine tool 1 are controlled by means of a control device 21. The control device 21 has a memory device 19 for storing program and tool data and a control device 20 for controlling both the lifting, lowering and Rotary movements of the upper tool holder 8 and the lower tool holder 10 as well as for controlling the tool moving device 6 based on the stored data.

Fig. 2 zeigt eine schematische Darstellung von mehreren Bearbeitungsschritten an dem Blech 4, das sich in der Auflageebene 5 (Fig. 1) befindet, von der Seite. Fig. 2 shows a schematic representation of several processing steps on the sheet 4, which in the support plane 5 (FIG. Fig. 1 ), from the side.

Ansicht A zeigt das Blech 4 vor einer Bearbeitung. Das Blech 4 liegt auf dem in dieser Figur nicht gezeigten Maschinentisch 3 der Werkzeugmaschine 1 und wird durch die Werkstückbewegungseinrichtung 6 so bewegt, dass ein zu bearbeitender Bereich des Blechs 4 in dem Bereich der oberen Werkzeugaufnahme 8 und unteren Werkzeugaufnahme 10 der Werkzeugmaschine 1 (Fig. 1) zu liegen kommt.View A shows the sheet 4 before processing. The sheet 4 rests on the machine table 3 of the machine tool 1, which is not shown in this figure, and is moved by the workpiece moving device 6 such that a region of the sheet 4 to be machined in the area of the upper tool holder 8 and lower tool holder 10 of the machine tool 1 (FIG. Fig. 1 ) comes to rest.

In Ansicht B ist gezeigt, wie ein Abkantwerkzeug, bestehend aus einem oberen Abkantwerkzeug 25, das in die obere Werkzeugaufnahme 8 der Werkzeugmaschine 1 (Fig. 1) aufgenommen ist, und einem unteren Abkantwerkzeug 26, das in die untere Werkzeugaufnahme 10 der Werkzeugmaschine 1 aufgenommen ist, verwendet wird. Das obere Abkantwerkzeug 25 wird nach unten gefahren und das untere Abkantwerkzeug 26 wird nach oben gefahren, um einen Abkantschritt durchführen. Durch die Bewegungen des oberen Abkantwerkzeugs 25 und des unteren Abkantwerkzeugs 26 wird ein Abschnitt des Blechs 4 um einen vorbestimmten Winkel α nach oben abgekantet, so dass ein abgekanteter Werkstückabschnitt 22 gegenüber einem Restabschnitt 23 des Blechs 4 entsteht, und der abgekantete Werkstückabschnitt 22 gegenüber dem Restabschnitt 23 hochgestellt ist. Der Winkel α beträgt hier 45°, kann aber alternativ, entsprechend einer einzubringenden nach unten gerichteten Umformung vorbestimmt werden, so dass die nach unten gerichtete Umformung nicht mit dem Maschinentisch 3 kollidiert.In view B is shown as a bending tool, consisting of an upper Abkantwerkzeug 25, which in the upper tool holder 8 of the machine tool 1 (FIG. Fig. 1 ) is received, and a lower Abkantwerkzeug 26, which is received in the lower tool holder 10 of the machine tool 1, is used. The upper Abkantwerkzeug 25 is moved down and the lower Abkantwerkzeug 26 is moved up to perform a Abkantschritt. By the movements of the upper bending tool 25 and the lower Abkantwerkzeugs 26, a portion of the sheet 4 is bent by a predetermined angle α upwards, so that a beveled workpiece portion 22 relative to a residual portion 23 of the sheet 4 is formed, and the folded workpiece portion 22 relative to the remaining portion 23 is raised. The angle α is here 45 °, but may alternatively, according to a einzubringenden downward Forming be predetermined, so that the downward forming does not collide with the machine table 3.

In einer alternativen Ausführungsform ist in die untere Werkzeugaufnahme ein unteres Abkantwerkzeug 26 aufgenommen und die untere Werkzeugaufnahme 10 oder das untere Abkantwerkzeug 26 ist mit einem gefederten Auswerfer versehen, der nach oben hin vorgespannt ist. Der gefederte Auswerfer umgibt das untere Abkantwerkzeug 26. Das untere Abkantwerkzeug 26 ist in der unteren Werkzeugaufnahme 10 so aufgenommen, dass das untere Abkantwerkzeug 26 über die Auflageebene 5 des Blechs 4 ragt. Der gefederte Auswerfer ist in seiner obersten Position so angeordnet, dass der gefederte Auswerfer über das untere Abkantwerkzeug 26 ragt und das Blech nach oben, oberhalb die Auflageebene 5, drückt. Das Blech 4 gleitet somit bei einer Bewegung mittels der Werkstückbewegungseinrichtung 6 auf dem gefederten Auswerfer und hat keinen Kontakt zu dem unteren Abkantwerkzeug 26, so dass es durch das untere Abkantwerkzeug 26 nicht beschädigt wird.In an alternative embodiment, a lower bending tool 26 is received in the lower tool holder and the lower tool holder 10 or the lower Abkantwerkzeug 26 is provided with a sprung ejector, which is biased upward. The sprung ejector surrounds the lower Abkantwerkzeug 26. The lower Abkantwerkzeug 26 is received in the lower tool holder 10 so that the lower Abkantwerkzeug 26 projects beyond the support plane 5 of the sheet 4. The sprung ejector is arranged in its uppermost position so that the spring-loaded ejector projects beyond the lower bending tool 26 and presses the sheet upward, above the support plane 5. The sheet 4 thus slides in a movement by means of the workpiece moving device 6 on the sprung ejector and has no contact with the lower Abkantwerkzeug 26 so that it is not damaged by the lower Abkantwerkzeug 26.

Zum Umformen wird das obere Abkantwerkzeug 25 mittels der oberen Werkzeugaufnahme 8 nach unten gefahren und das Blech 4 wird gegen die Vorspannkraft des gefederten Auswerfers nach unten gedrückt, wobei die untere Werkzeugaufnahme, und somit das untere Abkantwerkzeug 26 unbeweglich festgestellt ist. Dabei wird durch die Relativbewegung des oberen Abkantwerkzeugs 25 und des unteren Abkantwerkzeugs 26 der Abschnitt des Blechs 4 um den vorbestimmten Winkel α nach oben abgekantet, so dass der abgekantete Werkstückabschnitt 22 gegenüber dem Restabschnitt 23 des Blechs 4 entsteht, und der abgekantete Werkstückabschnitt 22 gegenüber dem Restabschnitt 23 hochgestellt ist. Der Winkel α beträgt auch hier 45°, kann aber alternativ, entsprechend einer einzubringenden nach unten gerichteten Umformung vorbestimmt werden, so dass die nach unten gerichtete Umformung nicht mit dem Maschinentisch 3 oder dem gefederten Auswerfer kollidiert.For forming the upper Abkantwerkzeug 25 is driven by the upper tool holder 8 down and the sheet 4 is pressed against the biasing force of the sprung ejector down, the lower tool holder, and thus the lower Abkantwerkzeug 26 is fixed immovably. In this case, by the relative movement of the upper Abkantwerkzeugs 25 and the lower Abkantwerkzeugs 26 of the portion of the sheet 4 by the predetermined angle α bent upward, so that the bent workpiece portion 22 relative to the remaining portion 23 of the sheet 4 is formed, and the bent workpiece portion 22 relative to the Remaining portion 23 is raised. The angle α is here also 45 °, but may alternatively, according to a be introduced to be introduced downward forming, so that the downward deformation does not collide with the machine table 3 or the sprung ejector.

Ansicht C zeigt einen Umformschritt als einen weiteren Schritt des Verfahrens. Ein Umformwerkzeug, bestehend aus einem in die obere Werkzeugaufnahme 8 eingewechselten oberen Umformwerkzeug 27 und einem in die untere Werkzeugaufnahme 10 eingewechselten unteren Umformwerkzeug 28, wird dabei verwendet. Das obere Umformwerkzeug 27 wird nach unten gefahren und das untere Umformwerkzeug 28 wird nach oben gefahren, so dass eine bezüglich des abgekanteten Werkstückabschnitts 22 nach unten gerichtete Umformung 24 in einem einzigen Hub entsteht. Alternativ werden auch mehrere Hübe, ggf. mit anderen Umformwerkzeugen ausgeführt. Da der Winkel α, um den der abgekantete Werkstückabschnitt 22 hochgestellt ist, in einer solchen Größe vorbestimmt ist, dass die nach unten gerichtete Umformung 24 nicht mit dem Maschinentisch 3 (Fig. 1) kollidiert, wird verhindert, dass, insbesondere bei offenen und/oder filigranen Umformungen, die durch das Umformen nach unten hergestellt werden, die Bauteile bei einem Bewegen des Blechs 4 über den Maschinentisch 3 durch eine Kollision damit verformt werden, so dass die Bauteile unbrauchbar werden.View C shows a forming step as a further step of the process. A forming tool, consisting of an upper tool holder 8 which is inserted into the upper tool holder 8, and a lower forming tool 28 which is inserted into the lower tool holder 10, is used in this case. The upper forming tool 27 is moved down and the lower forming tool 28 is moved upwards, so that with respect to the folded workpiece portion 22 downward forming 24 is formed in a single stroke. Alternatively, several strokes, possibly performed with other forming tools. Since the angle α, by which the bent workpiece section 22 is raised, is predetermined in such a size that the downwardly directed deformation 24 is not connected to the machine table 3 (FIG. Fig. 1 ) collides, is prevented, in particular in open and / or filigree deformations, which are produced by the forming down, the components are deformed when moving the sheet 4 on the machine table 3 by a collision with it, so that the components unusable become.

In Ansicht D ist ein Freischneidschritt als ein optionaler weiterer Bearbeitungsschritt gezeigt, in dem der abgekantete Werkstückabschnitt 22 mit der nach unten gerichteten Umformung 24 von dem Restabschnitt 23 des Blechs 4 abgetrennt wird. Hierzu wird in die obere Werkzeugaufnahme 8 ein Trennstempel 29 eingewechselt und in die untere Werkzeugaufnahme wird eine dem Trennstempel 29 entsprechende Matrize eingewechselt. Der Trennstempel 29 wird nach unten gefahren und der abgekantete Werkstückabschnitt 22 wird an der Abkantung abgetrennt. Alternativ kann die Abtrennung auch neben der Abkantung erfolgen.In view D, a free cutting step is shown as an optional further processing step in which the beveled workpiece section 22 with the downwardly directed deformation 24 is separated from the remaining section 23 of the sheet 4. For this purpose, a separating punch 29 is loaded in the upper tool holder 8 and in the lower tool holder a die corresponding to the die 29 is replaced. The separating stamp 29 is moved down and the bent workpiece portion 22 is separated at the fold. Alternatively, the separation can also be done next to the fold.

In Fig. 2 sind die einzelnen Bearbeitungsschritte des Verfahrens schematisch dargestellt. Das Verfahren kann beispielsweise auf die Herstellung von Bauteilen, bestehend aus den abgekanteten Werkstückabschnitten 22, die von einem Blechstreifen abgetrennt werden, angewendet werden.In Fig. 2 the individual processing steps of the method are shown schematically. The method can be applied, for example, to the production of components consisting of the folded workpiece sections 22, which are separated from a metal strip.

Fig. 3 zeigt eine alternative Anwendung des Verfahrens auf ein Blech 4, in dem der Abschnitt des Werkstücks, der abgetrennt wird, im Inneren einer Fläche des Blechs 4 liegt. Der Abschnitt weist eine, wie in Fig. 3 gezeigte, Außenkontur 30 auf, die in einem vorangehenden Schritt durch ein geeignetes Stanzwerkzeug auf mehreren Seiten (hier drei) des Abschnitts von dem Restabschnitt 23 abgetrennt ist. Fig. 3 shows an alternative application of the method to a sheet 4, in which the portion of the workpiece which is separated, lies in the interior of a surface of the sheet 4. The section has one, as in Fig. 3 shown outer contour 30, which is separated in a previous step by a suitable punching tool on several sides (here three) of the portion of the residual portion 23.

Fig. 4 zeigt das Ergebnis des Abkantschritts, in dem der Abschnitt an einer Seite, die nicht von dem Restabschnitt 23 getrennt ist, analog zu dem in Fig. 2 gezeigten Abkantschritt, abgekantet wird. Somit entsteht der abgekantete Werkstückabschnitt 22 mit der Außenkontur 30. Fig. 4 shows the result of the Abkantschritts in which the portion on a side which is not separated from the remaining portion 23, analogous to that in Fig. 2 shown Abkantschritt, is folded. Thus, the bent workpiece portion 22 is formed with the outer contour 30th

Wie in Fig. 5 gezeigt, wurde in dem Umformschritt in den abgekanteten Werkstückabschnitt 22 dann die nach unten gerichtete Umformung 24 eingebracht. Im Gegensatz zu dem in Fig. 2 gezeigten Verfahren wird hier der abgekantete Werkstückabschnitt 22 nicht in dem Freischneidschritt von dem Restabschnitt 23 getrennt, sondern die abgekantete Seite des abgekanteten Werkstückabschnitt 22 wird so bearbeitet, dass ein Micro-Joint-Verbund 31 entsteht. Somit kann der abgekantete Werkstückabschnitt 22 später beispielsweise von Hand von dem Restabschnitt 23 getrennt werden. Alternativ ist auch hier ein Freischneiden durch Stanzen oder mittels Laserbearbeitung möglich.As in Fig. 5 As shown, in the forming step in the bent workpiece portion 22, the downward forming 24 was then introduced. Unlike the in Fig. 2 As shown, the bent workpiece portion 22 is not separated from the remainder portion 23 in the free cutting step, but the folded side of the folded workpiece portion 22 is machined to form a micro-joint composite 31. Thus, the bent workpiece portion 22 later separated, for example, by hand from the remaining portion 23. Alternatively, a free cutting by punching or laser processing is also possible here.

Der abgekantete Werkstückabschnitt 22 ist in dem vorliegenden Ausführungsbeispiel auf einer Seite der Außenkontur 30 umgeformt. Eine Umformung mehrerer Seiten oder der Innenfläche des umgeformten Werkstückabschnitts 22 und/oder eine Stanzbearbeitung sind alternativ ebenfalls möglich.The bent workpiece portion 22 is formed in the present embodiment on one side of the outer contour 30. A transformation of several sides or the inner surface of the formed workpiece section 22 and / or a punching operation are alternatively also possible.

Das Abtrennen der Seiten des Abschnitts, aus dem der abgekantete Werkstückabschnitt 22 entsteht, von dem Restblech 23 kann alternativ, anstatt durch Stanzen, auch durch eine Laserbearbeitung erfolgen. Hierbei können dann flexibel verschiedenste Außenkonturen 30 erzeugt werden. Auch das vollständige Abtrennen des abgekanteten Werkstückabschnitts 22 von dem Restabschnitt 23 oder die Erstellung des Micro-Joint-Verbunds kann mit Hilfe einer Laserbearbeitung erfolgen.The separation of the sides of the portion from which the beveled workpiece portion 22 formed from the residual sheet 23 may alternatively, instead of punching, also by a laser machining done. In this case, a wide variety of outer contours 30 can then be generated flexibly. Also, the complete separation of the folded workpiece portion 22 of the remaining portion 23 or the creation of the micro-joint composite can be done by means of a laser processing.

Die Anfertigung der nach unten gerichteten Umformung 24 wird üblicherweise durch ein oberes Umformwerkszeug 27 und ein unteres Umformwerkzeug 28 hergestellt, die von dem oberen Abkantwerkzeug 25 und dem unteren Abkantwerkzeug 26 verschieden sind. Bei dem Verfahren durch das die in Fig. 3 bis Fig. 5 dargestellten Schritte ausgeführt werden, werden dann in den einzelnen Bearbeitungsschritten jeweils mehrere abgekantete Werkstückabschnitte 22 erstellt bzw. bearbeitet. Somit ist eine wirtschaftliche Herstellung der Bauteile möglich.The preparation of the downward forming 24 is usually made by an upper forming tool 27 and a lower forming tool 28, which are different from the upper Abkantwerkzeug 25 and the lower Abkantwerkzeug 26. In the process by which the in FIG. 3 to FIG. 5 In the individual processing steps, a plurality of beveled workpiece sections 22 are then created or processed. Thus, an economical production of the components is possible.

Claims (11)

  1. Method for introducing a downwardly directed reshaping (24) into a portion of a plate-like workpiece (4), in particular a sheet metal, lying on a workpiece support (3) of a machine tool (1), the workpiece (4) being movable with respect to the workpiece support (3), wherein the method comprises the steps:
    folding the portion of the workpiece (4) in a folding step, wherein the folded portion (22) of the workpiece has several sides and wherein it is only folded at a side connected to a residual portion (23) of the workpiece (3) lying on the workpiece support (3) so that the folded portion (22) of the workpiece is raised at a predetermined angle (α) with respect to the residual portion (23), and
    reshaping the folded portion (22) of the workpiece to have a reshaping directed downwardly with respect to the folded portion (22) of the workpiece in a reshaping step
    characterized in that
    after the step of reshaping, the folded portion (22) of the workpiece is separated from the residual portion (23) in a cutting-off step.
  2. Method according to claim 1, wherein the method comprises, before the folding step, a step in which an outer contour (30) of the folded workpiece (22) is separated from the residual portion (23) at the sides which are not folded in the folding step.
  3. Method according to any of the preceding claims, wherein the reshaping step is carried out by a single stroke.
  4. Method according to any of the preceding claims, wherein reshaping comprises moving a lower tool holder (10) upwardly and an upper tool holder (8) downwardly.
  5. Method according to any of the claims 1 to 3, wherein an upper tool holder (8) is downwardly moved and a lower tool holder (10) is immovably locked for the reshaping.
  6. Method according to any of the preceding claims comprising, before the folding step, placing a folding tool (25, 26) into tool holders (8, 10) of the machine tool (1) and, before the reshaping step, placing a reshaping tool (27, 28) different from the folding tool into the tool holders.
  7. Method according to claim 2 and any of the claims 3 to 6, wherein separating the outer contour (30) of the folded portion (22) of the workpiece from the residual portion (23) at the non-folded sides is performed by punching.
  8. Method according to claim 2 and any of the claims 3 to 6, wherein separating the outer contour (30) of the folded portion (22) of the workpiece from the residual portion (23) is performed by laser cutting.
  9. Method according to any of the preceding claims, wherein separating the folded portion (22) of the workpiece from the residual portion (23) is performed by punching.
  10. Method according to any of the claims 1 to 8, wherein separating the folded portion (22) of the workpiece from the residual portion (23) is performed by laser cutting.
  11. Method according to any of the preceding claims, wherein separating the folded portion (22) of the workpiece from the residual portion (23) comprises creating a micro-join connection (31).
EP13163556.7A 2012-04-23 2013-04-12 Method for introducing a deformation in a plate-like workpiece Not-in-force EP2656937B1 (en)

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US9358601B2 (en) 2016-06-07
JP2013223884A (en) 2013-10-31
CN103372761A (en) 2013-10-30
CN103372761B (en) 2018-03-02
US20130276503A1 (en) 2013-10-24
DE102012206657A1 (en) 2013-03-21
JP6157195B2 (en) 2017-07-05

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