EP2314397B1 - Method for producing a workpiece from sheet metal - Google Patents

Method for producing a workpiece from sheet metal Download PDF

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Publication number
EP2314397B1
EP2314397B1 EP10006975A EP10006975A EP2314397B1 EP 2314397 B1 EP2314397 B1 EP 2314397B1 EP 10006975 A EP10006975 A EP 10006975A EP 10006975 A EP10006975 A EP 10006975A EP 2314397 B1 EP2314397 B1 EP 2314397B1
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EP
European Patent Office
Prior art keywords
sheet metal
sheet
shaped
punching
band
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Not-in-force
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EP10006975A
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German (de)
French (fr)
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EP2314397A1 (en
Inventor
Hugo Bischopink
Meinolf Schröder
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Fischer and Kaufmann GmbH and Co KG
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Fischer and Kaufmann GmbH and Co KG
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Priority to PL10006975T priority Critical patent/PL2314397T3/en
Publication of EP2314397A1 publication Critical patent/EP2314397A1/en
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Publication of EP2314397B1 publication Critical patent/EP2314397B1/en
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    • 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
    • B21D49/00—Sheathing or stiffening objects
    • 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
    • B21D13/00—Corrugating sheet metal, rods or profiles; Bending sheet metal, rods or profiles into wave form
    • B21D13/04—Corrugating sheet metal, rods or profiles; Bending sheet metal, rods or profiles into wave form by rolling
    • 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
    • B21D17/00—Forming single grooves in sheet metal or tubular or hollow articles
    • B21D17/04—Forming single grooves in sheet metal or tubular or hollow articles by rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D7/00—Modifying the physical properties of iron or steel by deformation
    • C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C2/00—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
    • E04C2/30—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure
    • E04C2/32—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure formed of corrugated or otherwise indented sheet-like material; composed of such layers with or without layers of flat sheet-like material
    • E04C2/326—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure formed of corrugated or otherwise indented sheet-like material; composed of such layers with or without layers of flat sheet-like material with corrugations, incisions or reliefs in more than one direction of the element

Definitions

  • the invention relates to a method for producing a part from a sheet, which is formed by successive punching and forming operations, according to the preamble of patent claim 1.
  • From the GB 2 385 816 B or the WO 02/32599 A1 is a generic method, with which for cold work hardening of a sheet this wave and lattice-like deformed.
  • a device which has two toothed rollers, between which a sheet is deformed.
  • the wave-like indentations are larger than the thickness of the starting workpiece.
  • the WO 95/08409 A1 teaches for surface roughening a knurling pattern with bowl-like indentations which extend through the thickness of the sheet.
  • Forming and sheet metal parts are for example from the DE 100 20 176 C2 , of the DE 100 54 802 C2 , of the DE 103 56 746 B4 or the DE 103 44 885 B3 known.
  • complex three-dimensional workpieces in some cases with different wall thickness profiles, can be produced from a metal sheet by means of corresponding punching and bending processes, which only a few years ago could be produced merely as forgings or cast workpieces.
  • the invention has for its object to further improve this known prior art for the production of a sheet metal part in terms of material and weight savings.
  • a basic idea of the invention is to impress a defined structure in the starting sheet before forming a sheet metal part. As a result, a defined strain hardening of the sheet occurs, so that an output sheet with a smaller sheet thickness can be used in comparison to the use of a non-pretreated starting sheet to achieve desired strength values of the finished part. It can therefore be achieved with a lower material usage and thus with a reduced weight a desired end part with the same or even higher strength. This is particularly advantageous in the production of vehicle parts, such as levers, bearing parts, bushes and the like.
  • the structure is formed by impressions in the sheet, wherein a depth of the impressions is smaller than a thickness of the sheet. It is a surface structure formed by the indentations, so to speak, but no major transformations, such as bends, which affect the subsequent shaping of a complex three-dimensional part of the still flat sheet.
  • An embossed surface structure is not disturbing, in particular in the case of installation components not visible from the outside, for example in the engine compartment or on the chassis of a motor vehicle.
  • the impressions are formed as lines-shaped depressions.
  • the sheet is provided with a thickness of 1 mm to 10 mm and that the indentations are formed with a depth of 0.1 mm to 5 mm.
  • the depth of the impressions between 5% and 80% of the thickness of the sheet, which is in particular made of steel or another metal.
  • the impressions can be formed in the surface of the sheet in any way, such as by pressing. It is particularly advantageous, however, that the impressions are introduced by rolling by means of at least one embossing roller in the sheet. It is thus possible to create a regular structure in a continuous work process.
  • the indentations can be provided on one or both sides of the sheet.
  • a strip-shaped sheet metal is used as the sheet, which is wound into a coil.
  • the embossing can take place by means of one or more embossing rolls.
  • the embossing rollers can not only depress the depressions in the sheet, but produce an additional increase in strength over the entire surface of the sheet metal strip by applying a compressive stress over the entire width of the sheet metal strip. In this case also surface roughnesses of the starting sheet are advantageously reduced.
  • a particularly advantageous procedure results in that the punching and bending operations along a transfer line with punching and bending tools are carried out and that the band-shaped sheet is fed from the coil of a unwinding constantly, wherein at least one embossing roller between the transfer line and the unwinding is arranged for introducing the structure.
  • the stamping and bending tools necessary for forming the three-dimensional sheet-metal part which also include folding, stamping and other forming tools, are designed as transfer tools which are arranged side by side in a press. Each press stroke thus performs a work step.
  • the press is opened, the workpiece is transferred by a basically known conveying mechanism into the respectively following tool until the finished shaped workpiece is ejected.
  • a collection of the band-shaped sheet metal from the coil mounted on the unwinding is arranged.
  • the structure is impressed at least along strip-shaped areas.
  • the structure can thus be provided uniformly over the entire surface of the starting sheet.
  • the surface structure can be formed only in certain areas of the sheet, so that other areas of the sheet remain undeformed. This can be done, for example, in the areas which are subsequently either punched out of the stamping and bending tools or reshaped in such a way that sufficient strain hardening is achieved by this deformation.
  • areas with different structures can also be embossed in the metal sheet, so that regions with different degrees of strength are set across the width of the strip. It is thus possible to create a starting sheet with a differentiated distribution of strength.
  • the differentiation can be generated by denser, deeper or larger imprints.
  • a desired defined degree of solidification in individual regions can be formed for the subsequent forming. No or little pre-consolidation by the indentations is set in particular in the areas of the sheet, which are removed or reshaped during subsequent punching and bending.
  • the circumference of the embossing roll would correspond to the length of a sheet metal section required for forming a part and cut to length from the sheet metal strip.
  • the embossed structure would thus be repeated regularly in each sheet metal section.
  • the structure is formed with mesh or lattice-like recesses arranged. It is particularly advantageous according to the invention that the depressions or indentations in cross-section have a rounded recess bottom and rounded transitions to the flat surface. This is a particularly good pre-consolidation of the sheet and it Kerberpositionen be avoided in the subsequent forming operations.
  • the individual line-shaped depressions may have a mutual distance in the tenth of a millimeter range up to the centimeter range, preferably between 0.5 mm and 10 mm.
  • the lines can extend over the entire length and width of the band-shaped sheet and can have a width of 0.5 to a few millimeters.
  • the width of the recesses is about one to four times the depth of the indentations.
  • FIG Fig. 1 One possible pattern for a uniform structure 12 which can be stamped into a sheet 10 is in FIG Fig. 1 shown.
  • the structure 12 comprises rectilinear impressions, which are arranged in a grid or diamond-shaped uniformly on a surface of a metal sheet 10.
  • FIG. 2 An alternative form of training is in Fig. 2 shown in which the structure 12 is impressed in a wave-like manner in the surface of a sheet 10.
  • the wave-shaped depressions are not formed uniformly over the width of the band-shaped sheet 10.
  • the indentations are denser, ie arranged with a smaller line spacing than in an outer region. hereby a defined strength distribution over the width of the band-shaped sheet 10 is achieved.
  • FIG Fig. 3 A further exemplary embodiment of a sheet 10 pretreated according to the invention is shown in FIG Fig. 3 shown.
  • a surface side of the sheet 10 are line-shaped indentations 14 are introduced.
  • the transitions 16 of the impressions 14 are rounded in the flat surface side, as well as the bottom 18 of the wells. As a result, notch stresses are avoided during subsequent forming.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Architecture (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)

Abstract

The method involves forming a section by punching and bending process and stamping a structure (12) before the formation of the sections in an upper surface of a sheet metal (10). The firmness of the sheet metal is increased by stamping the structure. The structure is formed by embossing in the sheet metal. An independent claim is also included for a sheet metal part, which is formed by punching and bending of a metal sheet.

Description

Die Erfindung betrifft ein Verfahren zum Herstellen eines Teiles aus einem Blech, welches durch aufeinanderfolgende Stanz- und Umformvorgänge geformt wird, gemäß dem Oberbegriff des Patentanspruchs 1.The invention relates to a method for producing a part from a sheet, which is formed by successive punching and forming operations, according to the preamble of patent claim 1.

Aus der GB 2 385 816 B oder der WO 02/32599 A1 geht ein gattungsgemäßes Verfahren hervor, mit welchem zur Kaltverfestigung eines Bleches dieses wellen- und gitterartig verformt wird. Hierzu wird eine Vorrichtung vorgesehen, welche zwei verzahnte Rollen aufweist, zwischen denen ein Blech verformt wird. Die wellenartigen Einformungen sind größer als die Dicke des Ausgangswerkstückes. Die WO 95/08409 A1 lehrt zur Oberflächenaufrauung ein Rändelmuster mit schüsselartigen Einformungen, welche sich durch die Dicke des Blechs erstrecken.From the GB 2 385 816 B or the WO 02/32599 A1 is a generic method, with which for cold work hardening of a sheet this wave and lattice-like deformed. For this purpose, a device is provided, which has two toothed rollers, between which a sheet is deformed. The wave-like indentations are larger than the thickness of the starting workpiece. The WO 95/08409 A1 teaches for surface roughening a knurling pattern with bowl-like indentations which extend through the thickness of the sheet.

Umformverfahren und Blechteile sind beispielsweise aus der DE 100 20 176 C2 , der DE 100 54 802 C2 , der DE 103 56 746 B4 oder der DE 103 44 885 B3 bekannt. Mit diesen bekannten Verfahren können aus einem Blech durch entsprechende Stanz- und Biegevorgänge komplexe dreidimensionale Werkstücke, teilweise mit unterschiedlichen Wanddickenverläufen, hergestellt werden, welche noch vor einigen Jahren lediglich als Schmiede- oder Gusswerkstücke herstellbar waren.Forming and sheet metal parts are for example from the DE 100 20 176 C2 , of the DE 100 54 802 C2 , of the DE 103 56 746 B4 or the DE 103 44 885 B3 known. With these known methods, complex three-dimensional workpieces, in some cases with different wall thickness profiles, can be produced from a metal sheet by means of corresponding punching and bending processes, which only a few years ago could be produced merely as forgings or cast workpieces.

Die Herstellung derartiger komplexer Werkstücke durch Kaltumformung aus einem Blech ist gegenüber einem Schmieden oder Gießen mit hohen Materialtemperaturen Energie sparender, weniger arbeitsaufwändig aufgrund keiner oder geringerer Nacharbeitung wegen mangelnden Wärmeverzuges sowie Material sparender. Aufgrund einer bei der Kaltumformung erzielbaren hohen Werkstückfestigkeit werden bei Blechwerkstücken bei gleicher oder sogar höherer Festigkeit geringere Materialeinsätze benötigt. Dies ist nicht nur Ressourcen sparender, sondern führt auch zu einer Gewichtseinsparung, welche insbesondere beim Fahrzeugbau immer wichtiger wird.The production of such complex workpieces by cold forming from a sheet is compared to a forging or casting with high material temperatures energy-saving, less laborious due to no or lesser reworking due to lack of heat distortion and material-saving. Due to a high workpiece strength that can be achieved during cold forming, smaller material inserts are required for sheet metal workpieces with the same or even higher strength. This not only saves resources, but also leads to a weight saving, which is becoming increasingly important, especially in vehicle construction.

Der Erfindung liegt die Aufgabe zugrunde, diesen bekannten Stand der Technik zur Herstellung eines Blechteiles hinsichtlich Material- und Gewichtseinsparung noch weiter zu verbessern.The invention has for its object to further improve this known prior art for the production of a sheet metal part in terms of material and weight savings.

Nach der Erfindung wird diese Aufgabe durch ein Verfahren mit den Merkmalen des Anspruchs 1 gelöst. Bevorzugte Ausführungsformen sind in den jeweils abhängigen Ansprüchen angegeben.According to the invention, this object is achieved by a method having the features of claim 1 solved. Preferred embodiments are given in the respective dependent claims.

Bei dem erfindungsgemäßen Verfahren ist vorgesehen, dass vor dem Formen des Teiles in eine Oberfläche des Blechs eine Struktur spanlos eingeprägt wird, durch welche die Festigkeit des Bleches erhöht wird.In the method according to the invention it is provided that prior to molding of the part in a surface of the sheet, a structure is stamped without cutting, by which the strength of the sheet is increased.

Eine Grundidee der Erfindung besteht darin, vor dem Bilden eines Blechteiles in das Ausgangsblech eine definierte Struktur einzuprägen. Hierdurch tritt eine definierte Kaltverfestigung des Bleches ein, so dass zum Erreichen gewünschter Festigkeitswerte des Fertigteiles ein Ausgangsblech mit geringerer Blechdicke im Vergleich zur Verwendung eines nicht vorbehandelten Ausgangsbleches verwendet werden kann. Es kann also ein gewünschtes Endteil bei gleicher oder sogar höherer Festigkeit mit einem geringeren Materialeinsatz und damit mit einem verringerten Gewicht erreicht werden. Dies ist insbesondere bei der Herstellung von Fahrzeugteilen, etwa von Hebeln, Lagerteilen, Buchsen und ähnlichem von Vorteil.A basic idea of the invention is to impress a defined structure in the starting sheet before forming a sheet metal part. As a result, a defined strain hardening of the sheet occurs, so that an output sheet with a smaller sheet thickness can be used in comparison to the use of a non-pretreated starting sheet to achieve desired strength values of the finished part. It can therefore be achieved with a lower material usage and thus with a reduced weight a desired end part with the same or even higher strength. This is particularly advantageous in the production of vehicle parts, such as levers, bearing parts, bushes and the like.

Da zudem mit dem verringerten Materialeinsatz auch der Kostenaufwand sinkt und grundsätzlich auch Ausgangsbleche geringerer Festigkeit und damit von einer kostengünstigen Qualität eingesetzt werden können, wird zusätzlich ein wirtschaftlicher Vorteil erzielt.In addition, since with the reduced use of materials also the cost decreases and in principle starting sheets of lower strength and thus can be used by a low-cost quality, an additional economic advantage is achieved.

Nach der Erfindung wird die Struktur durch Einprägungen in dem Blech gebildet, wobei eine Tiefe der Einprägungen kleiner als eine Dicke des Bleches ist. Es wird sozusagen eine Oberflächenstruktur durch die Einprägungen gebildet, jedoch keine großen Umformungen, wie Abkantungen, welche die nachfolgende Formgebung eines komplexen dreidimensionalen Teiles aus dem weiterhin ebenen Blech beeinträchtigen. Eine geprägte Oberflächenstruktur ist insbesondere bei von außen nicht sichtbaren Einbauteilen, etwa im Motorraum oder am Fahrgestell eines Kraftfahrzeuges, nicht störend. Die Einprägungen sind als linien förmige Vertiefungen ausgebildet.According to the invention, the structure is formed by impressions in the sheet, wherein a depth of the impressions is smaller than a thickness of the sheet. It is a surface structure formed by the indentations, so to speak, but no major transformations, such as bends, which affect the subsequent shaping of a complex three-dimensional part of the still flat sheet. An embossed surface structure is not disturbing, in particular in the case of installation components not visible from the outside, for example in the engine compartment or on the chassis of a motor vehicle. The impressions are formed as lines-shaped depressions.

Besonders bevorzugt ist es nach der Erfindung, dass das Blech mit einer Dicke von 1 mm bis 10 mm vorgesehen wird und dass die Einprägungen mit einer Tiefe von 0,1 mm bis 5 mm ausgebildet werden. Erfindungsgemäß beträgt die Tiefe der Einprägungen zwischen 5% und 80% der Dicke des Blechs, welches insbesondere aus Stahl oder einem anderen Metall gebildet ist.It is particularly preferred according to the invention that the sheet is provided with a thickness of 1 mm to 10 mm and that the indentations are formed with a depth of 0.1 mm to 5 mm. According to the invention, the depth of the impressions between 5% and 80% of the thickness of the sheet, which is in particular made of steel or another metal.

Grundsätzlich können die Einprägungen in die Oberfläche des Blechs in beliebiger Weise gebildet werden, etwa durch Pressen. Besonders vorteilhaft ist es jedoch, dass die Einprägungen durch Einrollen mittels mindestens einer Prägewalze in das Blech eingebracht werden. Es kann so in einem kontinuierlichen Arbeitsprozess eine regelmäßige Struktur erzeugt werden. Die Einprägungen können auf einer oder auf beiden Seiten des Bleches vorgesehen werden.In principle, the impressions can be formed in the surface of the sheet in any way, such as by pressing. It is particularly advantageous, however, that the impressions are introduced by rolling by means of at least one embossing roller in the sheet. It is thus possible to create a regular structure in a continuous work process. The indentations can be provided on one or both sides of the sheet.

Nach der Erfindung ist es dabei besonders zweckmäßig, dass als Blech ein bandförmiges Blech verwendet wird, welches zu einem Coil aufgespult ist. Hierbei kann beim Abspulen des Blechbandes von dem Coil, also dem aufgespulten Blechband, das Einprägen mittels einer oder mehrerer Prägewalzen erfolgen. Die Prägewalzen können dabei nicht nur die Vertiefungen in das Blech eindrücken, sondern durch Aufbringung einer Druckspannung über die gesamte Breite des Blechbandes eine zusätzliche Festigkeitserhöhung über die gesamte Oberfläche des Blechbandes erzeugen. Hierbei werden auch Oberflächenrauhigkeiten des Ausgangsblechs in vorteilhafter Weise verringert.According to the invention, it is particularly expedient that a strip-shaped sheet metal is used as the sheet, which is wound into a coil. In this case, during unwinding of the sheet metal strip from the coil, that is, the coiled sheet-metal strip, the embossing can take place by means of one or more embossing rolls. The embossing rollers can not only depress the depressions in the sheet, but produce an additional increase in strength over the entire surface of the sheet metal strip by applying a compressive stress over the entire width of the sheet metal strip. In this case also surface roughnesses of the starting sheet are advantageously reduced.

Erfindungsgemäß ergibt sich ein besonders vorteilhafter Verfahrensablauf dadurch, dass die Stanz- und Biegevorgänge entlang einer Transferstraße mit Stanz- und Biegewerkzeugen ausgeführt werden und dass das bandförmige Blech von dem Coil von einer Abspuleinrichtung beständig zugeführt wird, wobei mindestens eine Prägewalze zwischen der Transferstraße und der Abspuleinrichtung zum Einbringen der Struktur angeordnet ist.According to the invention, a particularly advantageous procedure results in that the punching and bending operations along a transfer line with punching and bending tools are carried out and that the band-shaped sheet is fed from the coil of a unwinding constantly, wherein at least one embossing roller between the transfer line and the unwinding is arranged for introducing the structure.

Die zum Formen des dreidimensionalen Blechteiles notwendigen Stanz- und Biegewerkzeuge, unter welchen auch Abkant-, Präge- und andere Umformwerkzeuge zu verstehen sind, sind als Transferwerkzeuge ausgebildet, welche nebeneinander in einer Presse angeordnet sind. Bei jedem Pressenhub wird so ein Arbeitsschritt ausgeführt. Beim Öffnen der Presse wird das Werkstück durch eine grundsätzlich bekannte Fördermechanik in das jeweils nachfolgende Werkzeug übergesetzt, bis das fertig geformte Werkstück ausgestoßen wird. Gleichzeitig erfolgt an der Eingangsseite dieser Werkzeuganordnung ein Einzug des bandförmigen Bleches von dem auf der Abspuleinrichtung gelagerten Coil. Zwischen dieser Abspuleinrichtung und dem Eingang zu den Umformwerkzeugen ist die Prägeeinrichtung zum Aufbringen der festigkeitserhöhenden Oberflächenstruktur angeordnet.The stamping and bending tools necessary for forming the three-dimensional sheet-metal part, which also include folding, stamping and other forming tools, are designed as transfer tools which are arranged side by side in a press. Each press stroke thus performs a work step. When the press is opened, the workpiece is transferred by a basically known conveying mechanism into the respectively following tool until the finished shaped workpiece is ejected. At the same time takes place at the input side of this tool assembly, a collection of the band-shaped sheet metal from the coil mounted on the unwinding. Between this Abspuleinrichtung and the Entrance to the forming tools, the embossing device for applying the strength-increasing surface structure is arranged.

Weiter ist es nach einer vorteilhaften Ausführungsform der Erfindung vorgesehen, dass entlang des bandförmigen Bleches die Struktur zumindest entlang streifenförmiger Bereiche eingeprägt wird. Die Struktur kann somit gleichmäßig über die gesamte Oberfläche des Ausgangsbleches vorgesehen werden. Alternativ kann die Oberflächenstruktur nur in bestimmten Bereichen des Bleches ausgebildet werden, so dass andere Bereiche des Bleches noch unverformt bleiben. Dies kann etwa in den Bereichen erfolgen, welche nachfolgend in den Stanz- und Biegewerkzeugen entweder ausgestanzt oder derart umgeformt werden, dass durch diese Umformung eine ausreichende Kaltverfestigung erreicht ist.Furthermore, it is provided according to an advantageous embodiment of the invention that along the band-shaped sheet, the structure is impressed at least along strip-shaped areas. The structure can thus be provided uniformly over the entire surface of the starting sheet. Alternatively, the surface structure can be formed only in certain areas of the sheet, so that other areas of the sheet remain undeformed. This can be done, for example, in the areas which are subsequently either punched out of the stamping and bending tools or reshaped in such a way that sufficient strain hardening is achieved by this deformation.

Erfindungsgemäß können auch in dem Blech Bereiche mit unterschiedlichen Strukturen geprägt werden, so dass über die Breite des Bandes Bereiche mit unterschiedlichen Festigkeitsgraden eingestellt werden. Es lässt sich so ein Ausgangsblech mit einer differenzierten Festigkeitsverteilung erstellen. Die Differenzierung kann durch dichtere, tiefere oder größere Einprägungen erzeugt werden. Im Ausgangsblech kann so für die nachfolgende Umformung ein jeweils gewünschter definierter Verfestigungsgrad in einzelnen Bereichen gebildet werden. Keine oder eine geringe Vorverfestigung durch die Einprägungen wird insbesondere in den Bereichen des Blechs eingestellt, welche beim nachfolgenden Stanzen und Biegen entfernt beziehungsweise umgeformt werden.According to the invention, areas with different structures can also be embossed in the metal sheet, so that regions with different degrees of strength are set across the width of the strip. It is thus possible to create a starting sheet with a differentiated distribution of strength. The differentiation can be generated by denser, deeper or larger imprints. In the starting sheet, in each case a desired defined degree of solidification in individual regions can be formed for the subsequent forming. No or little pre-consolidation by the indentations is set in particular in the areas of the sheet, which are removed or reshaped during subsequent punching and bending.

Dies kann etwa dadurch erreicht werden, dass entsprechende Hervorhebungen auf der vorgeschalteten Prägewalze vorgesehen sind. In diesem Fall würde der Umfang der Prägewalze der Länge eines Blechabschnittes entsprechen, welcher zum Formen eines Teiles benötigt und vom Blechband abgelängt wird. Die Prägestruktur würde sich somit regelmäßig in jedem Blechabschnitt wiederholen.This can be achieved, for example, by providing appropriate emphasis on the upstream embossing roller. In this case, the circumference of the embossing roll would correspond to the length of a sheet metal section required for forming a part and cut to length from the sheet metal strip. The embossed structure would thus be repeated regularly in each sheet metal section.

Für eine einfache und kostengünstige Massenfertigung ist es vorteilhaft, dass die Struktur mit netz- oder gitterartig angeordneten Vertiefungen ausgebildet ist. Dabei ist es nach der Erfindung besonders vorteilhaft, dass die Vertiefungen oder Einprägungen im Querschnitt einen gerundeten Vertiefungsgrund und gerundete Übergänge zur ebenen Oberfläche aufweisen. Hierdurch wird eine besonders gute Vorverfestigung des Bleches erreicht und es werden Kerbspannungen bei den nachfolgenden Umformvorgängen vermieden.For a simple and cost-effective mass production, it is advantageous that the structure is formed with mesh or lattice-like recesses arranged. It is particularly advantageous according to the invention that the depressions or indentations in cross-section have a rounded recess bottom and rounded transitions to the flat surface. This is a particularly good pre-consolidation of the sheet and it Kerberspannungen be avoided in the subsequent forming operations.

Die einzelnen linienförmigen Vertiefungen können einen Abstand zueinander im Zehntelmillimeterbereich bis in den Zentimeterbereich, vorzugsweise zwischen 0,5 mm und 10 mm, aufweisen. Die Linien können sich über die gesamte Länge und Breite des bandförmigen Bleches erstrecken und können eine Breite von 0,5 bis einigen Millimetern aufweisen. Vorzugsweise beträgt die Breite der Vertiefungen etwa das ein- bis vierfache der Tiefe der Einprägungen.The individual line-shaped depressions may have a mutual distance in the tenth of a millimeter range up to the centimeter range, preferably between 0.5 mm and 10 mm. The lines can extend over the entire length and width of the band-shaped sheet and can have a width of 0.5 to a few millimeters. Preferably, the width of the recesses is about one to four times the depth of the indentations.

Nachfolgend wird die Erfindung anhand von bevorzugten Ausführungsbeispielen weiter erläutert, welche schematisch in den Zeichnungen dargestellt sind.The invention will be further elucidated on the basis of preferred exemplary embodiments, which are illustrated schematically in the drawings.

In den Zeichnungen zeigen:

Fig. 1
ein Blech mit einer gitterförmigen Struktur;
Fig. 2
ein Blech mit einer wellenlinienförmigen Struktur; und
Fig. 3
eine schematische Querschnittsansicht durch ein Blech mit einer ein- geprägten Struktur.
In the drawings show:
Fig. 1
a sheet with a lattice-shaped structure;
Fig. 2
a sheet with a wavy line structure; and
Fig. 3
a schematic cross-sectional view through a sheet with an embossed structure.

Ein mögliches Muster für eine gleichmäßige Struktur 12, welche in ein Blech 10 eingeprägt werden kann, ist in Fig. 1 dargestellt. Die Struktur 12 umfasst geradlinige Einprägungen, welche gitter- oder rautenförmig gleichmäßig an einer Oberfläche eines Bleches 10 angeordnet sind.One possible pattern for a uniform structure 12 which can be stamped into a sheet 10 is in FIG Fig. 1 shown. The structure 12 comprises rectilinear impressions, which are arranged in a grid or diamond-shaped uniformly on a surface of a metal sheet 10.

Eine alternative Ausbildungsform ist in Fig. 2 gezeigt, bei welcher die Struktur 12 wellenlinienförmig in die Oberfläche eines Blechs 10 eingeprägt ist. Dabei sind die wellenförmigen Vertiefungen nicht gleichmäßig über die Breite des bandförmigen Bleches 10 ausgebildet. In einem mittleren Bereich sind die Einprägungen dichter, also mit einem geringeren Linienabstand als in einem äußeren Bereich angeordnet. Hierdurch wird eine definierte Festigkeitsverteilung über die Breite des bandförmigen Bleches 10 erreicht.An alternative form of training is in Fig. 2 shown in which the structure 12 is impressed in a wave-like manner in the surface of a sheet 10. In this case, the wave-shaped depressions are not formed uniformly over the width of the band-shaped sheet 10. In a central region, the indentations are denser, ie arranged with a smaller line spacing than in an outer region. hereby a defined strength distribution over the width of the band-shaped sheet 10 is achieved.

Ein weiteres Ausführungsbeispiel eines erfindungsgemäß vorbehandelten Bleches 10 ist in Fig. 3 gezeigt. In eine Oberflächenseite des Bleches 10 sind linien förmige Einprägungen 14 eingebracht. Dabei sind die Übergänge 16 der Einprägungen 14 in die ebene Oberflächenseite gerundet ausgebildet, wie auch der Grund 18 der Vertiefungen. Hierdurch werden Kerbspannungen beim nachfolgenden Umformen vermieden.A further exemplary embodiment of a sheet 10 pretreated according to the invention is shown in FIG Fig. 3 shown. In a surface side of the sheet 10 are line-shaped indentations 14 are introduced. The transitions 16 of the impressions 14 are rounded in the flat surface side, as well as the bottom 18 of the wells. As a result, notch stresses are avoided during subsequent forming.

Claims (8)

  1. Method for producing a part from a sheet metal (10), which is formed by successive punching and forming processes, in which, prior to the formation of the part, a structure (12) is introduced in a non-cutting manner into a surface of the sheet metal (10), through which the strength of the sheet metal (10) is increased,
    characterized in that
    the structure (12) increasing the strength is embossed on the sheet metal (10) as a surface structure and in doing so linear embossments (14) are formed in the plane sheet metal (10), the depth of which is smaller than a thickness of the sheet metal (10) and ranges between 5% and 80% of the thickness of the sheet metal (10).
  2. Method according to claim 1,
    characterized in that
    the linear embossments (14) have a width of a few millimetres.
  3. Method according to claim 2,
    characterized in that
    the sheet metal (10) is provided with a thickness of 1 mm to 10 mm and
    in that the embossments (14) are designed with a depth of 0.1 mm to 5 mm.
  4. Method according to any one of claims 1 to 3,
    characterized in that
    the embossments (14) are introduced into the sheet metal (10) through rolling-in by means of at least one embossing roller.
  5. Method according to any one of claims 1 to 4,
    characterized in that
    as sheet metal (10) a band-shaped sheet metal (10) is used, which is wound up to a coil.
  6. Method according to claim 5,
    characterized in that
    the punching and forming processes are carried out along a transfer line with punching and bending tools and
    in that the band-shaped sheet metal (10) is supplied continuously from the coil by an unwinding means, with at least one embossing roller being arranged between the transfer line and the unwinding means for embossing the structure (12).
  7. Method according to any one of claims 1 to 6,
    characterized in that
    along a band-shaped sheet metal (10) the structure (12) is embossed at least along strip-shaped areas.
  8. Method according to any one of claims 1 to 7,
    characterized in that
    the structure (12) is designed with net- or grid-like arranged depressions.
EP10006975A 2009-09-22 2010-07-06 Method for producing a workpiece from sheet metal Not-in-force EP2314397B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL10006975T PL2314397T3 (en) 2009-09-22 2010-07-06 Method for producing a workpiece from sheet metal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102009042435A DE102009042435A1 (en) 2009-09-22 2009-09-22 Method for producing a part from a sheet metal and sheet metal part

Publications (2)

Publication Number Publication Date
EP2314397A1 EP2314397A1 (en) 2011-04-27
EP2314397B1 true EP2314397B1 (en) 2012-02-22

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
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EP (1) EP2314397B1 (en)
AT (1) ATE546241T1 (en)
DE (1) DE102009042435A1 (en)
PL (1) PL2314397T3 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021207020A1 (en) * 2021-07-05 2023-01-05 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung eingetragener Verein Process for the production of sheet metal components obtained by forming

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4343866A (en) * 1975-10-16 1982-08-10 Manville Service Corporation Deeply embossed sheet product
WO1995008409A1 (en) * 1993-09-24 1995-03-30 Bhp Steel (Jla) Pty. Ltd. Roll-forming cold worked sheet metal articles
DE19606981C2 (en) * 1996-02-24 2001-12-13 Thyssenkrupp Stahl Ag Process for the production of lightweight strips or sheets
DE10020176C2 (en) 2000-04-25 2003-10-09 Fischer & Kaufmann Gmbh & Co K Process for producing a disk with a thickened hub by deep drawing
KR100394557B1 (en) * 2000-10-16 2003-08-19 주식회사 진웅테크놀러지 Apparatus Of Metal Plate Embossed With Mesh-Type Groove For Duct
DE10054802C2 (en) 2000-11-03 2002-11-14 Fischer & Kaufmann Gmbh & Co K Process for producing a dimensionally stable joint part
GB0204873D0 (en) * 2002-03-01 2002-04-17 Hadley Ind Plc Strengthening of sheet materials
DE20303062U1 (en) 2003-02-25 2003-04-30 Fischer & Kaufmann GmbH & Co. KG, 57413 Finnentrop sheet metal part
DE10314115A1 (en) * 2003-03-28 2004-10-14 Audi Ag Process for forming a sheet from a tempered steel and device for carrying out the process
DE10344885B3 (en) 2003-09-26 2005-01-13 Fischer & Kaufmann Gmbh & Co. Kg Workpiece production process for sheet item involves forming sections with defined different wall thicknesses

Also Published As

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DE102009042435A1 (en) 2011-04-14
EP2314397A1 (en) 2011-04-27
ATE546241T1 (en) 2012-03-15
PL2314397T3 (en) 2012-07-31

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