EP3401032B1 - Composite tool and method for producing a sheet component - Google Patents

Description

The invention relates to a composite tool according to the preamble of claim 1 and a manufacturing method according to the preamble of claim 15. Such a composite tool and a corresponding manufacturing method are from WO 2008/025387 A1 known.

Composite tools and in particular complete composite tools are usually characterized in that at least two technologically different machining processes are carried out in one tool and in one press stroke. In other words, multiple operations or functions are integrated into one tool or machining step. In general, composite tools have so far mainly been used for geometrically simple components, which are usually made from a sheet metal strip. In the manufacture of large, complex sheet metal components, e.g.

Body panel parts are typically manufactured in a sequence of operations of drawing, trimming, piercing and final forming in multiple tools or tooling stages. The finish forming can in particular represent a bending operation. Typically, drawing the basic component shape from a flat sheet metal blank is the first operation in the manufacturing process with line or transfer tools.

Drawing is typically a deep-drawing, stretch-drawing or a combined process in one tool. Then, in operations that are separate from drawing, further steps such as punching, cutting and final shaping take place.

• Lochen: Zur Erzeugung einer geschlossenen Innenkontur am Werkstück
• Beschneiden: Hierbei wird der äußere Ziehrand abgeschnitten, um die Außenkontur des Bauteils zu erzeugen, bzw. eine vorläufige Außenkontur, die in einer nachfolgenden Operation weiter bearbeitet wird.
• Weitere Schneidprozesse ohne Bedeutung für die vorliegende Erfindung sind z.B. das Einschneiden oder Ausklinken.

The most common cutting processes on body sheet metal parts are, for example, shear cutting processes:

• Punching: To create a closed inner contour on the workpiece
• Cropping: Here, the outer drawing edge is cut off in order to create the outer contour of the component, or a preliminary outer contour that is further processed in a subsequent operation.
• Other cutting processes that are irrelevant to the present invention are, for example, notching or notching.

Post-forming or final forming are also understood to mean shaping operations, mostly in the last tool stage. Bending is a process of reshaping or finishing. The edge of the drawn and trimmed sheet metal part is "bent" by about 90°. Folded rims on sheet metal parts are used, for example, as joining flanges or as a preform for a flanging or roll hemming operation in the body shell, where the individual part is joined with others to form an assembly. In most cases, the bending is done in the last operation.

the Figure 16A shows schematically a sequence of operations known from the prior art of drawing-trimming-bending on a body component K. First, the body component K is drawn from a sheet metal blank K' (1.), before it is trimmed in a separate tool (2.) and Edge section Ka is folded (3.). For various reasons, it can be advantageous to "tighten" the edge section Ka, ie to preform the shape of the folded rim to a certain depth in the drawing. This is based on the Figure 16B illustrated in more detail. the Figures 16A and 16B each show the simple case in which all operations can be carried out in the working direction of a press. A tool element (folding strip) brushes past the edge section to be folded and bends it downwards.

Further variants of post-forming or final forming are, for example, refacing or calibrating. In this case, a component that has already been formed is acted on in certain areas in order to influence its geometry locally. Here, for example, embossings are introduced or radii are reduced.

Also known is the combination of trimming and edging in a follow-up tool on a component drawn in a first tool, with the cutting knife (with a cutting bar) also serving as a edging bar. This is shown schematically in the Figures 17A to 17C .

Proceeding from the prior art discussed above, the invention is based on the object of reducing the total number of tools required to manufacture a sheet metal component and thereby reducing operating costs and development and procurement times and shortening process chains.

This object is achieved with a composite tool of claim 1 and also with a manufacturing method of claim 15.

• die Matrize der ersten Struktur wenigstens zweiteilig, mit einer inneren Matrize und einer äußeren Matrize ausgeführt ist, wobei die innere Matrize und die äußere Matrize an der ersten Struktur relativ zueinander verstellbar sind, und
• die äußere Matrize und der relativ zu dem Stempel translatorisch verstellbare Blechhalter einander gegenüberliegen und eingerichtet sind, beim Pressen der zweiteiligen Matrize und des Stempels gegeneinander zwischen sich ein Abfallstück des Blechrohlings zu halten, das mit dem Pressen der Matrize und des Stempels gegeneinander an einem äußeren Rand des gezogenen Blechrohlings - respektive des aus dem Blechrohling hergestellten Ziehteils - abgetrennt wird.

According to a first aspect of the invention, a composite tool is proposed for producing a flat sheet metal component with a first structure having a drawing die (also referred to below as “die”) and a second structure having a drawing die (also referred to below as “punch”). At least the first structure or the second structure is at least partially translationally adjustable in order to press the die and the punch against each other and thereby the sheet metal component from a sheet metal blank located between the die and the punch and designed as a single blank by drawing, i.e. by a drawing process and Production of a drawn part. For this purpose, in addition to the stamp, at least one sheet metal holder that can be adjusted translationally relative to the stamp is provided on the second structure. Furthermore, the invention provides that

• the die of the first structure is designed in at least two parts, with an inner die and an outer die, the inner die and the outer die being adjustable relative to one another on the first structure, and
• the outer die and the sheet metal holder, which is translationally adjustable relative to the punch, are opposite one another and are set up to hold a waste piece of the sheet metal blank between them when the two-part die and the punch are pressed against each other, which with the pressing of the die and the punch against each other at an outer edge of the drawn sheet metal blank - or the drawn part produced from the sheet metal blank - is separated.

In this way, when the at least two-part die and the punch are pressed against each other, in addition to the drawing of the sheet metal blank (in a first Adjustment phase of the first and second structures) an edge trimming (in at least one subsequent second adjustment phase). The translationally adjustable blank holder, in cooperation with the at least two-part die, ensures the defined position and alignment of the waste piece to be separated and, thanks to its adjustability relative to the punch, ensures the integration of a trimming operation in the press stroke. In the following, "pressing the two-part die and the punch against each other" means in particular that the two-part die and the punch are displaced towards one another under the action of an adjustment force applied by a press (equipped with the composite tool) and an actual pressing of at least one Part of the at least two-part die against the punch only takes place at the end of the drawing process. "When pressing the two-part die and the punch against each other" and thus associated with the shift for the actual, later pressing of (drawing) die and (drawing) punch, for example, initially only the outer die against the blank holder - in the actual sense - "pressed". In particular, this includes the fact that the outer die is pressed against the blank holder during the entire drawing process and that the inner die is only pressed against the punch at the end of the drawing process.

That the inner die and the outer die are adjustable relative to each other on the first structure includes both the inner die being adjustable relative to the outer die and the outer die being adjustable relative to the inner die. Due to the adjustability of the inner and outer dies relative to each other on the first structure and the interaction with the adjustable sheet metal holder of the second structure, the waste piece can be separated particularly easily via the press stroke. In principle, the outer matrix of the first structure can at least partially enclose the inner matrix.

In one embodiment variant, the outer die has a first form-fitting area and the sheet metal holder has a second form-fitting area. The waste piece of the sheet metal blank is (locally) deformed during pressing via the first and second form-fitting areas of the outer die and the blank holder, so that at least one area of the waste piece engages in at least one of the first and second form-fitting areas and/or at least one of the first and second form-fitting areas positively engages in the piece of waste. The first and second form-fitting areas can thus serve to fix the waste piece between the sheet metal holder and the outer die during pressing, although this is not the case is mandatory. The first and second form-fitting areas can be formed, for example, as projections and/or indentations. For example, a bulge is provided on the outer die to produce a corresponding bead on the waste piece of the sheet metal blank.

The composite tool is thus set up to simultaneously use a pressing force applied for forming the sheet metal blank to separate an outer edge of the sheet metal blank as a waste piece and thus to trim the sheet metal blank. If necessary, the edge of the sheet metal component is also finish-formed, or at least reshaped. In one press stroke, in addition to forming, trimming and e.g. edge bending or folding takes place. The first structure and the second structure can consequently not only be set up to also separate an outer edge of the sheet metal blank as a waste piece when the die and the punch are pressed against one another. Rather, the first structure and the second structure can also be set up to reshape an edge section of the sheet metal component, on which there is a separating edge resulting from the cutting off of the waste piece, before or after the cutting off of the waste piece. In this context, it can be provided that with the pressing of the die and the punch against each other, the edge section of the sheet metal component on which the separating edge is present is bent before the waste piece is cut off or folded after the waste piece is cut off. In this case, a press on which the composite tool is set up with the first and second structures represents the sole drive for all tool functions, i.e. no further hydraulic or other actuators are used to implement the trimming and final forming.

In a composite tool according to the invention, at least one subsequent operation can be integrated in the drawing tool via the inner and outer matrices that can be adjusted relative to one another. Here, at least one external trimming of the sheet metal component is integrated into the drawing stage. This can in particular be a circumferential trimming, and therefore a complete trimming. However, it is also conceivable to carry out only a first segment trimming in the drawing tool, which could be realized, for example, in the special case of drawing with open heads. In principle, the pulling and the trimming take place in a continuous stroke of the composite tool. The created separating or trimming edge can represent the contour of the finished part as well as be further processed in further operations, eg bending or reshaping.

The composite tool according to the invention makes it possible to reduce the number of tools for the production of a sheet metal component by at least one operation. The invention is not limited to body components for motor vehicles, for example, but also extends to the production of other flat sheet metal components, in particular sheet metal components made of steel, aluminum or other materials.

The integration of edge trimming of the sheet metal blank must also be separated from the setting of a relief slot in an inner waste area of the component, e.g. in a window opening. Such a relief cut is made during the forming, which promotes the material flow from "inside to outside". However, this is only a line-shaped cut, i.e. no trimming operation. This operation does not produce any waste that would have to be removed from the tool. The area of the relief incision made is only cut out in a subsequent operation. Consequently, it is not a matter of integrating a crop operation into the drawing tool.

It is also known to make internal relief cuts or holes when cutting a sheet metal blank. Again, this is not about integrating a crop operation into the drag tool. It is also known that punches are installed in the drawing tool. These are used to cut holes in the waste area of the component, which are used to center the drawn part in the subsequent operation. Again, it is not a matter of integrating a trimming operation into the drawing tool, as the proposed solution envisages.

In one embodiment variant, the composite tool integrates a circumferential outer component trimming in the drawing stage. Further operations can be integrated into the drawing stage in possible further developments. This involves, for example, the integration of drawing, cutting and edging or drawing, cutting, edging and embossing. This makes it possible, for example, to realize the entire production sequence of a sheet metal component in the composite tool and in a press stroke implemented with it.

The proposed solution also differs from progressive dies, which are characterized in that the components are manufactured from a sheet metal strip (from a coil) that is pushed or pulled step by step through a sequence of several tool stages. The finished component is only separated from the strip in the last stage. With progressive dies, in usually only small to medium-sized, geometrically simple components are manufactured in large quantities. In contrast, with the proposed solution, it is possible for large, complex sheet metal components to be produced from a flat sheet metal blank (in the form of a single blank), with a forming operation preceding the trimming of the component.

The composite tool typically forms a component-specific pressing tool in which a sheet metal blank is formed globally. This is followed by severing, preferably shearing at the periphery of the three-dimensionally shaped geometry, no laser or water jet cutting in the horizontal plane. In addition, the sheet metal component is not cut out, but a waste piece is cut off from the sheet metal blank.

Alternatively or additionally, in one embodiment variant, the sheet metal holder on the second structure can be adjusted relative to the stamp into an insertion position onto the outer die. In the insertion position then assumed, the sheet metal blank is to be arranged with an edge section on the sheet metal holder. During the subsequent pressing of the die and the punch against each other, the blank holder can be adjusted relative to the punch into a holding position different from the insertion position, in which the waste piece separated from the sheet metal blank is held between the outer die and the blank holder. For example, the sheet metal holder is displaced from the insertion position under the influence of the first structure and in particular of the outer die adjusted with the first structure. The waste piece of the sheet metal blank provided between the outer die and the adjustable sheet metal holder is optionally reshaped in a defined manner. In any case, the separated piece of scrap is held in a defined position at the end of the press stroke by the sheet metal holder, which can be adjusted relative to the stamp, and can be displaced relative to the finished sheet metal component. This is particularly advantageous with a view to removing the waste piece from the composite tool.

As already explained above, the proposed composite tool is set up to use a pressing force applied for forming the sheet metal blank and thus the press stroke at the same time to separate the waste piece and, if necessary, to finish-form the edge of the sheet metal component. Accordingly, then in one embodiment by the translational adjustment of the first structure and the second structure on each other to the sheet metal holder relative to the punch and / or inner and outer matrices are adjusted relative to each other. The blank holder is thus, for example, during the press stroke relative to the ram not externally operated by an additional drive adjustable, but only by the press force. A movement of the sheet metal holder relative to the punch is thus caused solely by the adjustment of the first and second structures toward one another and the press stroke thus implemented. An additional (motorized) adjustment drive is not provided for this. The same applies to the alternatively or additionally provided adjustment of inner and outer matrices relative to each other during pressing.

A stamp attachment is additionally provided on the second structure, which is arranged between the sheet metal holder and an insertion area for a cutting edge of the first structure. By providing an additional punch attachment, for example, it is possible to design a drawing shell in the composite tool with an open-angled frame. This in turn allows the sheet metal blank to be stretched out into the middle of the component. This is necessary, for example, for flat outer skin parts such as roofs or outer door panels as (body) sheet metal components to be manufactured. The punch attachment is adjacent to an area of the second structure, the insertion area, into which a cutting edge of the second structure provided for cutting the sheet metal blank can dip during pressing. Against this background, in an embodiment variant, the stamp attachment is opposite a hold-down device of the first structure. In one embodiment variant, the punch attachment can be at a distance from the punch and, on the other hand, from the sheet metal holder (transverse to the direction of adjustment of the sheet metal holder). In an alternative embodiment variant, however, the stamp construction can also be an integral part of the stamp.

In principle, the first structure and the second structure of the composite tool can be set up so that the waste piece can be separated by shear cutting when the die and the punch are pressed against one another.

In the case of the at least two-part die proposed according to the invention, in which an inner die and an outer die can be adjusted relative to one another, a cutting edge can be formed on the outer die or a cutting edge can be mounted in one variant for separating the waste piece. In the former case, an edge of the outer die adjacent to the inner die forms a cutting edge for severing the waste piece. The outer die is here (possibly together with the blank holder opposite) during the Adjusted press stroke relative to the inner die. In the other case mentioned above, a separate cutting edge or a cutting knife with such a cutting edge is mounted on the outer die.

A cutting edge (of a cutting knife) is provided on the first structure, relative to which the inner die of the at least two-part die is mounted adjustably on the first structure. In this variant, during the press stroke and an adjustment of the first structure towards the second structure, the inner die is displaced counter to the direction of adjustment with respect to the cutting edge, so that the cutting edge separates the waste piece as the first structure is adjusted further, possibly forming the separating edge adjacent to it the inner matrix.

In one embodiment variant, the cutting edge is designed with a cutting strip which (a) simultaneously acts as a folding strip when the die and the punch are pressed against one another or which (b) interacts with a counterholder when the die and the stamp are pressed against one another and then acts as a folding strip against the latter Counterholder works. In the latter case, the cutting bar is intended, for example, for edging a flared and/or multiple-stepped rim when pressing the die and the punch against each other.

In one embodiment, a cutting edge of the cutting strip has at least one first cutting edge section and at least one second cutting edge section, wherein, based on a direction pointing from the inner die to the outer die, the at least one first cutting edge section is on the inside and the at least one second cutting edge section is on the outside. so that an inner contour of the cutting edge is defined with the at least one first cutting edge section and an outer contour of the cutting edge is defined with the at least one second cutting edge section. The protrusion of different cutting edge sections can prove to be particularly advantageous if two edge regions are to be provided on the component, one edge region of which is finished after drawing and trimming, while an adjacent edge region still needs a bevel after drawing and trimming of a laid out rim must be subjected. The movable cutting bar is then designed differently for these different edge areas.

In particular in this context it can then also be provided that the at least one second cutting edge section defining the outer contour The cutting edge protrudes relative to the at least one first cutting edge section defining the inner contour, for example in an adjustment direction of the cutting edge, in which the cutting edge is adjusted relative to one another when the die and the punch are pressed. In this way, when the die and the punch are pressed against one another, the cutting edge first uses the second cutting edge section of its cutting edge to trim the sheet metal blank in a second (subsequently beveled) edge region, before the cutting edge uses the first cutting edge section of its cutting edge to trim the sheet metal blank in a different manner makes the first edge area.

The at least one second cutting edge section of the cutting edge that defines the outer contour protrudes from the at least one first cutting edge section that defines the inner contour - depending on the component geometry, process, sheet metal material and thickness, e.g. by 0.5 mm to 3.0 mm. In one embodiment variant, for example, a projection in the range from 0.7 mm to 1.4 mm is provided. In the second edge area of the bevel, the second cutting edge section thus runs ahead by a certain amount compared to the cutting edge section for the first edge area, specifically by 0.5 mm to 3.0 mm, for example. As a result, the trimming is carried out in the second edge area first.

A counter-holder interacting with the cutting strip can also be designed and provided to act against one another as a counter-knife when pressing the die and the punch for a transition region of the cutting edge, where the cutting edge transitions from the at least one first cutting-edge section into the at least one second cutting-edge section. As a result, uncontrolled tearing in a transition edge area of the sheet metal blank can be limited to a minimum length or even completely prevented.

In particular, in a further development based on this, a counterholder that interacts with the cutting strip can be designed and provided to be displaced when the die and the punch are pressed against one another by the cutting edge resting against the counterholder with the at least one first cutting edge section, after which the at least one second cutting edge section can be used the sheet metal blank has been trimmed. After trimming in a second edge area and a transition area, the cutting strip sits on the counterholder in the first edge area and begins to push it down against a defined force as the press stroke progresses.

In one embodiment variant, a contour of a counterholder that interacts with the cutting strip is designed as an undercutter for a transition area of the cutting edge, where the cutting edge transitions from the at least one first cutting edge section to the at least one second cutting edge section. In this case, the trimming is carried out in advance in the first edge area and then peels over the transition edge area. Finally, the second edge area is cut and folded.

Alternatively or additionally, a cutting insert can be provided on an upper or lower cutter in a transition area.

In one embodiment variant, the first structure and the second structure can also be set up to provide at least one embossing on the edge section of the sheet metal component to be produced by pressing the dies and the stamp against one another. For this purpose, for example, at least one embossed or stepped forming surface for the sheet metal blank is provided on an optionally adjustable counterholder of the first or second structure, so that during the press stroke and the sheet metal blank is inserted as intended into the composite tool, there is a corresponding embossing on the finished edge section at the end of the press stroke. A shaping surface for embossing can be provided, for example, on the first structure on a cutting, folding or embossing bar and/or on the second structure on the stamp.

In a further development, the cutting edge of the first structure, relative to which the inner die is mounted adjustably, can also be designed with a cutting strip which, when the die and the punch are pressed against one another, acts simultaneously as a folding strip and as a shaping strip for providing the embossing in order to to provide the embossing on a flared edge of the edge section.

Alternatively or additionally, an (embossing) insert can be provided on the first structure, by means of which an embossing is made in the component surface (and thus not on a peripheral flange), in particular a door handle recess, during drawing or after drawing is complete. The integration of an embossing process for producing an embossing in the component surface in the press stroke can make it easier to achieve a higher surface quality. During the shaping of the embossing lying in the component surface, eg for a recessed grip, the (embossing) insert is the The sheet metal blank is still under a certain degree of biaxial tensile stress from the drawing process and the component surface to be stamped is held between the punch and the inner die. This biaxial tensile stress superimposes the stress conditions created by the embossing process in and around the embossment and mitigates the influence of the different unfolding lengths across the embossment.

In one exemplary embodiment, a punch for producing at least one hole in the sheet metal component is provided on the first structure. In this case, the punch can be provided for producing the at least one hole on the embossing produced by means of the insert. In a further development designed for this purpose, the insert is then e.g the punch produces at least one hole. Embossing and perforation can thus also be produced here using the composite tool in one press stroke. It can be particularly advantageous here if the punch is guided in the (embossing) insert and the insert (in the second adjustment phase) assumes the function of a hold-down device.

As already explained at the outset, the composite tool can be designed as an overall composite tool and/or be set up and provided in particular for the production of a flat body component for a motor vehicle. An example of a flat body part is a roof paneling. Another flat body component can be, for example, a door panel, in particular an outer door panel of a motor vehicle door.

A further aspect of the proposed solution relates to a method for producing a flat sheet metal component by means of a press device which comprises a first structure having a die and a second structure having a stamp.

In analogy to the proposed composite tool, which can be part of a corresponding drawing device, the proposed method provides that with the pressing of the die and the punch against each other in order to shape the sheet metal component by drawing, an outer edge of the sheet metal blank is also separated as a waste piece and thus a trimming of the sheet metal blank is also carried out within the composite tool. To draw the sheet metal blank, a sheet metal holder that can be adjusted in a translatory manner relative to the stamp is used at least, on which a outer edge of the sheet metal blank to be drawn is held. As part of the method, an at least two-part die with an inner die and an outer die is used, in which the inner die and the outer die can be adjusted relative to one another on the first structure. The outer die and the blank holder, which is translationally adjustable relative to the punch, are opposite one another, with the outer die and the blank holder holding the piece of waste between them when the two-part die and the punch are pressed against each other, which occurs when the die and the punch are pressed against each other on the outer edge of the drawn sheet metal blank is separated. A cutting edge is provided on the first structure for cutting off the waste piece, and a stamp attachment (2B) is also provided on the second structure, which is arranged between the sheet metal holder and an insertion area for the cutting edge of the first structure.

Here, too, both forming and trimming are consequently implemented in one press stroke, the trimming being implemented mechanically by means of the parts of the press device that are adjusted relative to one another during pressing, without these having to be adjusted via a separate adjustment drive.

For example, finish forming is additionally provided in that the edge section of the sheet metal component, on which there is a separating edge created by cutting off the waste piece, is bent before the cutting off of the waste piece or folded after the cutting off of the waste piece by pressing the die and the punch against one another.

In a proposed manufacturing method, a press can be used with a composite tool according to the invention, in particular equipped with it. The press equipped with the compound tool then drives the compound tool. Advantages and features explained above and below for embodiment variants of a composite tool therefore also apply to embodiment variants of a proposed production method and vice versa.

The attached figures illustrate exemplary possible embodiment variants of the proposed solution.

Figur 1

eine erste Ausführungsvariante eines Verbundwerkzeugs mit zweiteiliger Matrize, wobei eine innere und eine äußere Matrize des Verbundwerkzeugs relativ zueinander verstellbar gelagert sind und an einer äußeren Matrize eine Schneidkante für das Abtrennen eines Abfallstücks von einem Blechrohling ausgebildet ist;

Figur 1A

ausschnittsweise eine vergrößerte Darstellung im Bereich der inneren und äußeren Matrizen des Verbundwerkzeuges der Figur 1 an der Schneidkante der äußeren Matrize;

Figuren 2A-2F

verschiedene Phasen eines Herstellungsprozesses eines Blechbauteils, hier z.B. in Form eines Karosseriebauteils, unter Nutzung des Verbundwerkzeuges der Figuren 1 und 1A;

Figur 3

eine weitere Ausführungsvariante eines Verbundwerkzeugs mit einer an die äußere Matrize montierten Schneide eines Schneidmessers;

Figuren 4A-4E

verschiedene Phasen eines Herstellungsprozesses eines Karosseriebauteils unter Nutzung des Verbundwerkzeuges der Figur 3;

Figur 5

eine weitere Ausführungsvariante eines Verbundwerkzeuges mit innerer und äußerer Matrize sowie separater Schneide und einer Stempelankonstruktion;

Figuren 6A-6G

verschiedene Phasen eines Herstellungsprozesses eines Karosseriebauteils unter Nutzung des Verbundwerkzeugs der Figur 5;

Figur 7

in vergrößertem Maßstab eine Weiterbildung der Ausführungsvariante der Figuren 5 und 6A bis 6G mit einem hinterschnittigen Stempel;

Figur 8

ausschnittsweise ein herzustellendes Blechbauteil in Form eines Karosserieteils mit einem zungenartig vorstehenden Flansch im Bereich des fertiggeformten Randabschnitts;

Figur 9

eine weitere Ausführungsvariante eines herzustellenden Karosseriebauteils mit einem verprägten Bord an dem fertiggeformten Randabschnitt;

Figur 10A

eine weitere Ausführungsvariante eines Verbundwerkzeugs mit separater Schneide, die zwei unter einem Winkel zueinander verlaufende Schneidenabschnitte aufweist;

Figur 10B

in vergrößertem Maßstab mit Blick auf den Stempel des Verbundwerkzeuges der Figur 10A eine mögliche Weiterbildung zur Herstellung eines verprägten Bords an dem Karosserieteil entsprechend der Figur 9;

Figur 11

in vergrößertem Maßstab mit Blick auf den Stempel des Verbundwerkzeuges eine mögliche Weiterbildung zur Herstellung eines mehrfach gestuften Bords;

Figur 12

eine weitere Ausführungsvariante eines Verbundwerkzeugs mit einem Einsatz zur Herstellung einer muldenförmigen Verprägung in der Bauteilfläche eines herzustellenden Karosseriebauteils im Pressenhub und mit einem in dem Einsatz geführten Lochstempel für die Herstellung eines Lochs in der muldenförmigen Verprägung;

Figuren 13A - 13G

verschiedene Phasen eines Herstellungsprozesses eines Karosseriebauteils unter Nutzung des Verbundwerkzeugs der Figur 12;

Figur 14

schematisch eine Weiterbildung eines Verbundwerkzeugs der Figur 5 mit in den Stempel integrierter Stempelankonstruktion, die für die Herstellung des Karosseriebauteils mit einem Niederhalter zusammenwirkt;

Figur 15A

ein herzustellendes flächiges Blechbauteil in Form einer Dachbeplankung für ein Kraftfahrzeug;

Figur 15B

ein herzustellendes flächiges Blechbauteil in Form eines Türaußenblechs für eine Kraftfahrzeugtür;

Figuren 16A-16B

schematisch aus dem Stand der Technik bekannte Folgen für das Ziehen, Beschneiden und Abkanten an einem Karosseriebauteil;

Figuren 17A-17C

in unterschiedlichen Phasen eine übliche Kombination aus Beschneiden und Abkanten an einem zuvor in einem separaten Ziehwerkzeug gezogenen Karosseriebauteils;

Figur 18

ein Karosseriebauteil mit Fertigbeschnitt- und Abkantbereichen;

Figuren 18A-18B

ausschnittsweise eine Weiterbildung eines Verbundwerkzeugs der Figuren 5 und 6A bis 6G unter Veranschaulichung unterschiedlicher Schneidkantenabschnitte für eine Schneidleiste zur Herstellung des Karosseriebauteils der Figur 18;

Figur 19

ausschnittsweise eine Ausführungsvariante einer Schneidleiste in einem Verbundwerkzeug entsprechend der Figuren 18A und 18B in Schrägansicht von unten;

Figur 20

die Kontur eines mit der Schneidleiste der Figur 19 zusammenwirkenden Gegenhalters in Draufsicht.

Here show:

figure 1

a first embodiment variant of a composite tool with a two-part die, wherein an inner and an outer die of the composite tool are mounted such that they can be adjusted relative to one another and a cutting edge for separating a waste piece from a sheet metal blank is formed on an outer die;

Figure 1A

a detail of an enlarged view in the area of the inner and outer matrices of the composite tool figure 1 on the cutting edge of the outer die;

Figures 2A-2F

Different phases of a manufacturing process of a sheet metal part, here for example in the form of a body part, using the composite tool figures 1 and 1A ;

figure 3

a further embodiment variant of a composite tool with a cutting edge of a cutting blade mounted on the outer die;

Figures 4A-4E

Different phases of a manufacturing process of a body component using the composite tool figure 3 ;

figure 5

a further variant of a composite tool with an inner and outer die and a separate cutting edge and a punch attachment;

Figures 6A-6G

different phases of a manufacturing process of a body component using the composite tool figure 5 ;

figure 7

on an enlarged scale, a further development of the variant of the figures 5 and 6A to 6G with an undercut stamp;

figure 8

a detail of a sheet metal component to be produced in the form of a body part with a tongue-like projecting flange in the region of the finished edge section;

figure 9

a further embodiment variant of a body component to be produced with an embossed rim on the finished edge section;

Figure 10A

a further variant embodiment of a composite tool with a separate cutting edge, which has two cutting edge sections running at an angle to one another;

Figure 10B

on an enlarged scale with a view of the stamp of the composite tool Figure 10A a possible development for the production of an embossed board on the body part according to the figure 9 ;

figure 11

on an enlarged scale with a view of the stamp of the composite tool, a possible further development for the production of a multi-stepped board;

figure 12

a further embodiment of a composite tool with an insert for producing a trough-shaped embossing in the component surface of a body component to be produced in the press stroke and with a punch guided in the insert for producing a hole in the trough-shaped embossing;

Figures 13A - 13G

different phases of a manufacturing process of a body component using the composite tool figure 12 ;

figure 14

schematically a further development of a composite tool figure 5 with a stamp attachment integrated in the stamp, which interacts with a hold-down device for the production of the body component;

Figure 15A

a flat sheet metal component to be produced in the form of roof paneling for a motor vehicle;

Figure 15B

a sheet metal component to be produced in the form of an outer door panel for a motor vehicle door;

Figures 16A-16B

Schematic sequences known from the prior art for drawing, trimming and edging on a body component;

Figures 17A-17C

in different phases, a usual combination of trimming and bending on a body component previously drawn in a separate drawing tool;

figure 18

a body component with finished trimming and folding areas;

Figures 18A-18B

a detail of a further development of a composite tool figures 5 and 6A to 6G illustrating different cutting edge sections for a cutting strip for the production of the body component of figure 18 ;

figure 19

sectional view of a variant of a cutting bar in a composite tool according to Figures 18A and 18B in oblique view from below;

figure 20

the contour of one with the cutting bar of the figure 19 interacting counter-holder in top view.

the Figure 15A shows a body component K in the form of a car roof cladding with a circumferential folded board. the Figure 15B shows a body component K in the form of a door outer panel for a motor vehicle door with a recessed grip M in holes L1 and L2 formed therein for the attachment of a door handle. Details A and B in the Figure 15B show in section the design of the different edges of the outer door panel including the flanges. The conventional sequence of operations in the manufacture of such sheet metal components Figures 15A and 15B consists of drawing, cutting and bending in typically four tools and, if necessary, additionally - in the case of the outer door panel - of embossing and punching. All trimmed edge areas are more or less perpendicular to the working direction of the press device to be used. The folded areas are free of undercuts.

With the Figures 1 to 14 different variants are illustrated in order to produce a flat body part K or a modified body part K from a (sheet metal) blank K' in the form of a flat individual circuit board.

The variants of figures 1 , 1A , and 2A to 2F on the one hand as well as the Figures 3 and 4A to 4E, on the other hand, suggest drawing and complete trimming in a (total) compound tool W. Bending is done in a separate tool.

The variant of figures 5 and 6A to 6G proposes drawing, complete trimming and all-round folding in a further developed (overall) composite tool W, ie the entire manufacturing process of the body component K takes place in the composite tool W. A possible further development aims at slightly different component geometries with flared flanges KF according to figure 8 away. It includes drawing, complete trimming, folding and post-forming in one tool. The reshaping refers to the setting of the flange angle in the closed tool, whereby a targeted compensation of the elastic angle deflection when opening the tool is achieved.

The variant of Figures 10A and 10B proposes drawing, complete trimming, folding and embossing in a composite tool W, with flared flange areas KF having embossing P (cf. figure 9 ). The embossing operation can be used at the same time to adjust the flange angle (spring-back compensation).

the figure 11 illustrates the production of multi-stepped rims using the compound tool W.

one in the figures 12 and 13A to 13G The composite tool W shown and the method implemented with it provides for drawing, complete trimming, folding, embossing and punching, eg for the production of an outer door panel Figure 15B . Bending is done here on straight and flared flanges. Embossing takes place in the component face; can alternatively or additionally (also) take place in the area of the flange.

In the variant of figures 1 , 1A , and 2A to 2F the composite tool W comprises an upper structure O with a multi-part die 1 and a substructure U with a punch 2 and a sheet metal holder 3 that can be adjusted for this purpose Press and the substructure U are attached to a (press) table 6 of the press. The present two-part die 1 has an inner die 1A and an outer die 1B. The inner and outer dies 1A, 1B are relative moveable to each other. The outer matrix 1B encloses the inner matrix 1A at least in regions.

The inner die 1A and the outer die 1B are adjustably mounted on an upper part 5 of the superstructure O via (upper air) bolts Bo. These bolts Bo protrude through passage openings 50 of the upper part 5 and thus aligned through openings 70 of a ram 7 of the press which is arranged above the upper part 5 and on which the upper part 5 is fixed. At least one spacer Z is provided on the upper part 5 in the area of the outer matrix 1B. Via this spacer Z, the upper part 5 can act on the outer die 1B during a press stroke along an adjustment direction Vu and cause an adjustment movement of the inner and outer dies 1A, 1B relative to one another.

The inner die 1A is opposite the stamp 2 of the substructure U, which is immovably fixed to a lower part 4 of the substructure U. The lower part 4 in turn rests on the table 6 of the press. The stamp 2 forms a stamping surface 20 . This punch face 20 faces a die face 10A of the inner die 1A.

Adjacent to the outer matrix 1B, the inner matrix 1A forms a bending web 11A at the edge. This bending web 11A protrudes in the direction of the punch 2 and corresponds to a peripheral recess 21 on the punch 2. When the die 1 and the punch 2 are pressed together as the upper structure O approaches the substructure U, the bending web 11A of the inner die 1A and the recess 21 of the stamp 2, a bent edge portion Ka is formed on the body component K.

This edge section Ka is formed at a separating edge at which a waste piece A is separated from the blank K' by shear cutting. For this purpose, the outer die 1B forms a cutting edge 11B and interacts with a sheet metal holder 3 of the substructure U. The sheet metal holder 3 is mounted on the substructure U in a translationally adjustable manner and forms a sheet metal holder surface 30 on which the waste piece A of the blank K′ to be separated is placed. The punch surface 20, together with the die surface 10A of the inner die 1A, the blank holder surface 30 and an opposite die surface 10B of the outer die 1B, defines a gap R between the punch 2, blank holder 3 and the two-part die 1. In this gap R is the Insert blank K ', and then in one Press stroke to shape and trim the body component K. The waste piece A is pressed in between the blank holder surface 30 and the opposite die surface 10B of the outer die 1B and held securely.

For the fixation of the waste piece A, in particular while it is being separated from the rest of the blank K′, the sheet metal holder 3 and the outer die 1B form a form-fitting area in the form of a groove-like depression 32 and a projection 12B.

The press stroke and thus the processing of the (sheet metal) blank K 'takes place on the composite tool W shown in 8 phases, based on the Figures 2A to 2F are illustrated.

First, the composite tool W is open, ie, the space R is accessible and the sheet metal holder 3 is adjusted to a raised insertion position in the direction of the outer die 1B. The adjustment of the sheet metal holder 3 along an adjustment direction Vo is controlled via (under-air) bolts Bu. If the blank holder 3 is in its insertion or starting position, the blank holder surface 30 is approximately at the level of the highest point of the stamping surface 20. The inner die 1A and the outer die 1B, controlled via the (over-air) bolts Bo, are retracted this far that blank K' can be inserted and comes to rest on the blank holder surface 30 ( Figure 2A ).

Subsequently, the inner die 1A and the outer die 1B descend together with the upper part 5. A surface 110A at the outermost protruding end of the flexible web 11A remains offset-free at the same height as the die surface 10B of the outer die (cf. Figure 1A ). Drawn or blocking beads or clamping steps for material flow control are formed on the blank K′ via the form-fitting areas 12B and 32 on the outer die 1B and the blank holder 3 . The edge of the blank K' surrounding the later waste piece A is clamped between the sheet metal holder surface 30 and the die surface 10B of the outer die 1B ( Figure 2B ).

The force of the upper air cushion (ram cushion) defined by the bolts Bo is greater than the force of the lower air cushion (table drawing cushion) defined by the bolts Bu. As a result, the outer matrix 1B displaces the lower air cushion as the stroke progresses, ie as the upper structure O approaches the lower structure U further along the adjustment direction Vu. The pulling process begins. The blank K 'spans over the Stamp 2. The surfaces 110A and 10B of the inner and outer matrices 1A, 1B remain at the same level, since they are each supported against the common upper air cushion via the row of bolts Bo ( Figure 2C ).

If the inner die 1A sits on the punch 2, the body component K is shaped and the drawing process is completed. As the press stroke progresses, the upper air bolts Bo are pushed into the (press) ram 7 via the inner die 1A. The upper air bolts Bo return empty behind the outer die 1B. The inner die 1A, the outer die 1B and the blank holder 3 come to a brief standstill until the outer die 1B is seated on the at least one spacer Z ( Figure 2D ).

If the press stroke progresses continuously, the inner die 1A continues to stand still, while the inner die 1A continues to displace the upper air bolts Bo acting on it. In contrast, the outer die 1B is supported via the at least one spacer Z against the upper part 5 and the press ram 7 . As a result, the outer die 1B moves further downwards in the adjustment direction Vu, relative to the inner die 1A, with the sheet metal holder 7 being displaced. Thus, for the first time, there is a relative movement between the inner and outer dies 1A, 1B. The cutting process begins.

The inner die 1A fixes the body component K on the punch 2 and thereby assumes the function of a blank holder. The stamp 2 now has the function of a cutting attachment. The cutting edge 11B of the outer die 1B performs the function of a cutting blade. The cutting edge 11B shears into the sheet material until it breaks through. A cutting gap s is determined by a horizontal offset between punch 2 and outer die 1B ( Figure 1A ). This completes the cutting process. A drawing edge defined by the waste piece A is severed from the body component K ( Figure 2E ).

After reaching the bottom dead center, the upper structure O moves with the press ram 7 and the upper part 5 upwards (in the adjustment direction Vo) and takes the inner and outer die 1A, 1B with it. It does not matter whether the upper air is pressurized or depressurized in this phase. Now the body component K and the waste piece A can be removed. This can be done simultaneously or sequentially, manually or mechanized, for example by robot suction spiders. Beneficial for the withdrawal is that the piece of waste that has been cut off comes to rest at a level below the separating edge of the body component (cf. Figure 2E ).

Preferably, the lower air with the sheet metal holder 3 only moves up again after the body component K and the waste piece A have been removed, in order to prevent the scrap from colliding with the body component K. After the sheet metal holder 3 has reached the loading position (starting position), a new blank K' in the form of a single flat blank can be loaded.

• Stempel 2 und Blechhalter 3 in der Oberstruktur O und innere und äußere Matrize 1A, 1B in der Unterstruktur U angeordnet sind,
• anstatt von Ober- und/oder Unterluft (gesteuerte) Gasdruckfedern oder andere geeignete Federelemente eingesetzt werden, und/oder
• abweichend vom dargestellten Ablauf nicht der Stempel 2 stillsteht, sondern ein beliebiges anderes Werkzeugelement des Verbundwerkzeugs W, während sich die anderen Werkzeugelemente entsprechend relativ dazu bewegen, unabhängig von der dazu erforderlichen werkzeug- oder pressenseitigen Antriebstechnik.

The procedure explained above can be varied in deviation from the attached figures, for example, to the effect that

• Stamp 2 and sheet metal holder 3 are arranged in the upper structure O and inner and outer die 1A, 1B in the substructure U,
• (controlled) gas pressure springs or other suitable spring elements are used instead of upper and/or lower air, and/or
• Deviating from the sequence shown, it is not the punch 2 that stands still, but any other tool element of the composite tool W, while the other tool elements move relative thereto, regardless of the tool or press-side drive technology required for this.

1. 1. Insbesondere bei flächigen Außenhautteilen, wie PKW-Dächern, kann es erforderlich sein, dem (Zieh-) Stempel einen sogenannten Anbau zuzufügen. Der Anbau am seitlichen Rand des Stempels 2 ist vorliegend einstückig mit dem Stempel 2 ausgebildet und definiert an der Ansparung 21 zwei zueinander versetzte Stufen 21a und 21b. Der Anbau ermöglicht derart eine vergrößerte Ziehtiefe und eine offene Gestaltung der Zarge. Dadurch wird eine verbesserte Ausreckung des Karosseriebauteils K bis in seine Mitte hinein erzielt. Wird ein solcher Anbau eingesetzt, erfolgt der Beschnitt nicht in der Trennebene von Stempel 2 und Blechhalter 3 wie in der Variante der Figuren 1, 1A und 2A bis 2F, sondern auf der durch den Anbau definierten und seitlich gegenüber der inneren Matrize 1A vorstehenden Stufe 21b. Der Anbau fungiert gleichzeitig als Beschnittbank.
2. 2. Die äußere Matrize 1B ist fest mit dem Oberteil 5 verbunden und damit hieran nicht verstellbar gelagert. Die innere Matrize 1A stützt sich über Gasdruckfedern Go oder andere Federelemente gegen das Oberteil 5. Nach Abschluss des Ziehvorgangs werden die Federelemente, hier in Form der Gasdruckfedern Go, verdrängt. Eine Variante mit Gasdruckfedern Go ist dabei z.B. besonders geeignet für den Einsatz auf Pressen, die über keine Oberluft verfügen.
3. 3. Das eigentliche Schneidelement ist als separate Schneide 9 in Form einer Schneidleiste ausgeführt, hier mit Freiwinkeln dargestellt. Anstelle der Schneidkante 11B ist an der äußeren Matrize 1B eine Rundung 13B vorgesehen. Die Schneide 9 ist an einer als Montagehalterung fungierenden Aussparung 19B der äußeren Matrize 1B montiert. Das Vorsehen einer separaten Schneide 9 ermöglicht eine einfachere Anpassung des Schneidspalts und des Schneidüberlaufs, sowie eine gesonderte Werkstoffwahl, Bearbeitung, Wärmebehandlung oder Beschichtung der schneidenden Elemente im Vergleich zur Ausbildung der Schneide an der äußeren Matrize 1B. Durch entsprechende Gestaltung der Schneidleisten kann statt dem vollkantigen Schneiden ein schälendes oder kreuzendes Schneiden erfolgen. Dadurch werden die Schneidkräfte und der Schnittschlag beim Durchbrechen deutlich reduziert. Selbstredend kann auch der Stempel 2 mit einer Schneide, insbesondere in Form von Schneidleisten, ausgestattet und/oder mit einem Freiwinkel versehen sein.
4. 4. In dieser Ausführung kann die Schneide 9 im Übrigen auch bis zum Ende des Ziehens gegenüber der inneren Matrize 1A zurückstehen, ohne das Ziehergebnis zu beeinträchtigen.

the Figures 3 and 4A to 4E show a further exemplary embodiment of the composite tool W. The process sequence is in principle the same as that of the exemplary embodiment in FIG figures 1 , 1A and 2A to 2F identical. The variant of Figures 3 and 4A to 4E differs from the previously explained variant essentially in the following points:

1. 1. In the case of flat outer skin parts in particular, such as car roofs, it may be necessary to add a so-called extension to the (drawing) die. In the present case, the extension on the lateral edge of the stamp 2 is designed in one piece with the stamp 2 and defines two steps 21a and 21b that are offset relative to one another at the recess 21 . The extension enables an increased drawing depth and an open design of the frame. This achieves improved stretching of the body component K up to its center. If such an attachment is used, the trimming does not take place in the parting plane of punch 2 and blank holder 3, as in the variant in FIG figures 1 , 1A and 2A to 2F , but on the step 21b defined by the attachment and protruding laterally in relation to the inner matrix 1A. The extension also functions as a trimming bench.
2. 2. The outer matrix 1B is firmly connected to the upper part 5 and is therefore not adjustable on it. The inner die 1A is supported against the upper part 5 via gas pressure springs Go or other spring elements. After the drawing process is complete, the spring elements, here in the form of the gas pressure springs Go, are displaced. A variant with Go gas pressure springs is particularly suitable for use on presses that do not have upper air.
3. 3. The actual cutting element is designed as a separate cutting edge 9 in the form of a cutting bar, shown here with clearance angles. Instead of the cutting edge 11B, a rounding 13B is provided on the outer die 1B. The blade 9 is mounted on a recess 19B of the outer die 1B functioning as a mounting bracket. The provision of a separate cutting edge 9 allows easier adjustment of the cutting gap and cutting overflow, as well as separate material selection, machining, heat treatment or coating of the cutting elements compared to forming the cutting edge on the outer die 1B. By designing the cutting sticks appropriately, peeling or crossing cutting can take place instead of full-edged cutting. This significantly reduces the cutting forces and the cutting impact when breaking through. Of course, the punch 2 can also be equipped with a cutting edge, in particular in the form of cutting strips, and/or be provided with a clearance angle.
4. 4. In this embodiment, the cutting edge 9 can also stand back from the inner die 1A until the end of the drawing, without impairing the drawing result.

• ebenfalls mit Schneidleisten bestückt sein, und/oder
• Gasdruckfedern anstatt Tischkissenbolzen verwenden, und/oder
• Federelemente anstatt Oberluftbolzen verwenden, und/oder
• Freiwinkel an der Schneidkante 11B und/oder Stempel 2 aufweisen

The the variants of figures 1 , 1A and 2A to 2F and the Figures 3 and 4A to 4E can also be combined with each other. Thus, a composite tool W according to the variant figures 1 , 1A and 2A to 2F

• also be equipped with cutting strips, and/or
• Use gas struts instead of table cushion bolts, and/or
• Use spring elements instead of upper air bolts, and/or
• Clearance angles on the cutting edge 11B and/or punch 2 have

The variants of figures 1 , 1A and 2A to 2F and the Figures 3 and 4A to 4E show the component production with tightened board. The tightening of the board is necessary to position the drawn and trimmed body part K when Insertion in the subsequent bending tool to ensure. However, there may be a risk of what is known as edge throwing. The raised edges represent a surface defect of the component along the fold line, which is particularly visible on the painted vehicle and therefore cannot be tolerated.

• Auch das Abkanten wird in das Verbundwerkzeug W integriert. Es werden gegenüber der konventionellen Fertigungsfolge der Dachbeplankung zwei Werkzeuge eingespart.
• Auf das Anziehen des Bords als Positionierhilfe für ein separates Abkantwerkzeug kann dadurch verzichtet werden. Das Risiko des Kantenaufwurfs entfällt.
• Der schlanke nasenartig vorstehende Biegesteg 11A an der inneren Matrize 1A zum Anziehen des Bords entfällt. Das Verbundwerkzeug W wird dadurch robuster.
• Es kann ein Niederhalter 1C an der Oberstruktur O eingesetzt werden, wenn dies vorteilhaft für den Prozess des Schneidens ist.
• Es kann ein Gegenhalter 8 an der Unterstruktur U eingesetzt werden, wenn dies vorteilhaft für den Prozess des Abkantens ist.
• Der Abstand zwischen Karosseriebauteil K und Abfallstück A am Ende des Pressenhubs ist größer als bei den Varianten der Figuren 1, 1A und 2A bis 2F und der Figuren 3 und 4A bis 4E, was eine kontrollierte Entnahme und Separierung von Karosseriebauteil K und Abfallstück A erleichtert.

This danger is in the variant of the figures 5 and 6A to 6G avoided. The following can be achieved with this variant:

• Folding is also integrated into the composite tool W. Two tools are saved compared to the conventional production sequence of the roof cladding.
• There is no need to tighten the rim as a positioning aid for a separate bending tool. There is no risk of edges throwing up.
• The slim nose-like protruding bending bar 11A on the inner matrix 1A for tightening the board is omitted. This makes the compound tool W more robust.
• A hold-down device 1C can be used on the upper structure O if this is advantageous for the cutting process.
• A counterholder 8 can be used on the substructure U if this is advantageous for the folding process.
• The distance between body component K and waste piece A at the end of the press stroke is greater than in the variants of figures 1 , 1A and 2A to 2F and the Figures 3 and 4A to 4E , which facilitates controlled removal and separation of body component K and waste piece A.

The process sequence for the production of the body component K is divided here into seven phases, shown on a tool assembly with a counterholder 8 and hold-down device 1C according to FIG Figures 6A to 6G . These two elements are not absolutely necessary, but can improve quality and process reliability depending on the component. In the present case, the counter-holder 8 is supported on the lower part 4 via a spring element in the form of a gas pressure spring Gu and is pretensioned in the direction of the upper part 5 . The counter-holder 8 is opposite the cutting edge 9 of the upper structure O and is arranged between the punch 2 and a punch attachment 2B. The punch attachment 2B is arranged between the sheet metal holder 3 and an insertion area E for the cutting edge 9 of the first structure O. The hold-down device 1C is in turn arranged opposite the punch attachment 2B and is located between the cutting edge 9 and the outer die 1B.

First, the composite tool W is open. The inner die 1A and the hold-down device 1C are supported on the extended bolt Bo of the ram cushion. The counter-holder 8 and the blank holder 3 are each in a raised insertion or starting position. The blank K' is inserted ( Figure 6A ).

The plunger 7 with the upper part 5 moves down. The outer die 1B sits on the blank holder 3. The beads on waste piece A are shaped and the edge of blank K' is clamped between blank holder 3 and outer die 1B ( Figure 6B ).

In the further downward movement, the sheet metal is clamped over the stamp 2 and thereby formed. The drawing process is complete when the inner die 1A and the hold-down device 1C are seated on the panel or the body component K. An area of the waste piece A then rests on a clamping surface 20B of the punch attachment 2B and is clamped between the hold-down device 1C and the punch attachment 2B, while an area of the waste piece A closer to the edge is fixed between the outer die 1B and the blank holder 3 ( Figure 6C ).

Optionally, the under-air can be switched to zero pressure. The free lowering of the sheet metal holder 3 releases the bead. As a result, the body component K can spring back elastically by a certain amount. As a result, the body component K is trimmed under less tension, which may have a positive effect on its quality and dimensional accuracy.

While the press ram 7 and thus the upper structure O with the upper part 5 continue to lower, the inner die 1A and the hold-down device 1C displace the ram cushion. The cutting edge 9 of the cutting knife engages with the blank K' and performs the trimming. Contrary to the simplified representation, the punch attachment 2B and cutting edge 9 can be provided with clearance angles for cutting. The board is first bent freely at a certain angle until the counter-holder 8 begins to take effect. From here the cutting knife with the cutting edge 9 acts as a folding strip. For this purpose, the cutting blade is preferably provided with a radius (not shown) on its edge facing the die 2 . At the same time, the sheet metal holder 3 is continuously pushed further against the table cushion ( Figure 6D ).

In the further course, the cutting blade with the cutting edge 9 rests on the counter-holder 8 of the substructure U. The body part K is clamped between blade 9 and counter-holder 8 under pressure. In the further downward movement, the sheet metal of the Body part K between these two elements 8, 9 is pulled out in a controlled manner and gradually formed into a board. At the same time, upper and lower air is further displaced. Due to the continued movement of the sheet metal holder 3 and the outer die 1B, the waste piece is pulled further outwards and spatially separated from the body part K. If no counter-holder 8 is used, in this phase there is a free bending of the shelf ( Figure 6E ).

When the composite tool W reaches its bottom dead center and the upper structure O and the lower structure U are thus as close as possible to one another along the adjustment direction Vu, the composite tool W is completely closed. The board is fully formed ( Figure 6F ).

The superstructure O then moves to its starting position along the opposite adjustment direction Vo. The cutting knife with the cutting edge 9 is pulled back one after the other. The inner die 1A and the blank holder 1C release the body component K. The body component K and the waste piece A can be removed. Advantageously, the sheet metal holder 3 initially remains in its lower position, ie, in the design shown, the lower air moves up only with a delay. As a result, the waste piece A can be gripped from its stable position on the sheet metal holder 3 and the stamp attachment 2B. The counter-holder 8 should also only be raised with a delay in order to prevent deformation of the shelf. In the construction shown, this is realized with a controlled gas pressure spring Gu ( Figure 6G ).

In a possible development of the composite tool W in the figure 7 is shown, the punch 2 has a defined undercut angle α in the area of the bent section Ka of the body component K (which forms the bent edge). A side wall 22 of the punch 2 thus jumps back by the undercut angle α in relation to the inner die 1A. In connection with a corresponding design of the punch edge radius, additional complementary surfaces on the cutting edge 9 and/or the inner die 1A and precise incorporation of the pressure conditions in the composite tool W, a targeted overbending of the rim in the closed tool can be achieved. After the elastic springing up when the composite tool W is opened, the rim then assumes the required angular position.

In the enlarged view of the figure 7 the holder surface 80 of the counter holder 8 which is inclined at an angle β relative to the horizontal is also illustrated. The inclined holding surface 80 supports the controlled removal of the body part K between the counter-holder 8 and the cutting edge 9.

A further exemplary embodiment relates to the production of sheet metal components with a tongue-shaped flange KF which adjoins the folded rim at least in regions and which, for example, fulfills the function of a joining flange and extends predominantly perpendicularly to the working direction of the press. A corresponding body part K is an example in the figure 8 shown.

In the production of such a body part K, in principle, a composite tool W is used according to the variant figures 5 and 6A to 6G used, in which case a counter-holder 8 is absolutely necessary. Since the designed rim length is greater overall in the areas of the additional flange KF, the trimming takes place further out. The cutting blade with the cutting edge 9 and the counter-holder 8 are made wider by the corresponding amount. At bottom dead center, the counter-holder 8 preferably rests on at least one rigid spacer, which limits the stroke of the counter-holder downwards (in the direction of adjustment Vu). In contrast to the variant of figures 5 and 6A to 6G the stroke is already over when there is still a sheet metal dimension between the cutting edge 9 and the counterholder 8 that corresponds to the width of the flange KF.

It is also important here that the cutting edge 9 and the counterholder 8 can have a positive or negative angle β to the horizontal (see also figure 7 ). This angle β serves to form flanges KF which have a corresponding position in the compound tool W. The angle β is preferably dimensioned in such a way that it compensates for the elastic deflection of the flange when the composite tool W is opened by means of targeted overbending.

Joint flanges on a sheet metal component often have additional gradations or embossing P or the like, as in figure 9 is shown as an example. In order to form these embossments P, an embossing operation is required. This can be realized with a design variant of the composite tool W, as shown in FIG Figures 10A and 10B is shown. The cutting blade with the cutting edge 9 and its cutting strip also assumes the function of a folding strip and, lastly, a shaped strip for embossing.

In this variant, first a pulling and trimming takes place according to the variant of the figures 5 and 6A to 6G . The hold-down device 1C of the upper structure O is again optional. During the bending process, the flow of material is preferably controlled by a counterholder 8 in order to ensure error-free shaping. The composite tool W and the manufacturing process to be implemented with it are coordinated in such a way that the trimmed or separating edge of the sheet metal leaves the counter-holder 8 shortly before the bottom dead center is reached. The stamp outline thus largely corresponds to the contour of the finished body part K.

Deviating from the variant of figures 5 and 6A to 6G the stamp 2 and the cutting edge 9 have mutually opposite and mutually complementary shaped surfaces which correspond to the geometry of the issued board on the body part K. Correspondingly, the forming surface 210 of the recess 21 opposite a first cutting edge section 90a has 2 steps for producing the embossing P on the punch. In contrast, the holder surface 80 of the counter holder 8 and the complementary surface of a second cutting edge section 90b opposite this holder surface 80, which runs at an obtuse angle to the surface of the first cutting edge section 90a, are largely flat ( Figure 10B ). Once the sheet metal of the body part K has left the counterholder 8, it now lies between the (forming) surfaces of the stamp 2 and the cutting edge 9. On a remaining stroke to bottom dead center, which only corresponds to the height of the embossing P or a little more, the embossing P is formed.

The area between the cutting edge 9 and the punch 2 is again advantageously inclined by the angle β (cf. 7 ) in relation to the horizontal in order to form appropriate layers of the exhibited shelf or to bring in targeted overbends.

As in the sectional view of figure 11 is shown, the production of multi-stepped rims with a compound tool W is also possible. In a further development according to figure 11 For example, adjacent cutting edge sections 90a, 90b of the cutting edge 9 are stepped for this purpose, so that one cutting edge section 90b projects in the adjustment direction Vu in relation to the other cutting edge section 90a. The counter-holder 8 opposite the blade 9 accordingly has a holder surface 80 that is complementary to the blade sections 90a, 90b, so that a between the cutting edge 9 and the counter-holder 8 at the end of the press stroke formed board is stepped several times.

One with the figures 12 and 13A to 13G shown variant of a composite tool W is based on the variant of the figures 5 and 6A to 6G and provides for the formation of a trough-shaped embossing in the component surface by means of an (embossing) insert 16 on the upper structure O during the cutting and folding in the edge area. The insert 16 is mounted on the upper part 5 so that it can be adjusted elastically relative to the inner matrix 1A. The elastic mounting is implemented via a number of spring elements F1, F2, via which the insert 16 is supported on the upper part 5. The production of the embossing on the body part - here, for example, in the form of a recessed grip M corresponding to the Figure 15B - is also realized in the press stroke and accomplished without additional adjustment drives. For this purpose, an embossing depression 201 of the stamp 2 formed in the stamp surface 20 is opposite the insert 16 . The insert 16 can dip into this embossing depression 201 when the inner die 1A and the punch 2 are pressed against one another.

In order to make a hole L1 in the embossing M in a first adjustment phase after the trough-shaped embossing M has been formed on the sheet metal blank K′, a punch 17 rigidly fixed to the upper part 5 is guided on the insert 16 . Thus, after the embossing M has been formed, the insert 16 is displaced against the spring elements F1, F2 in the upper part 5 with further adjustment of the upper part 5 in adjustment Vu and thus in a further, second adjustment phase. The punch 17 engages and punches the body component K as the adjustment continues, with the insert 16 taking on the function of a hold-down device. Perforation waste LA resulting from the perforation is disposed of via an opening in the embossing trough 201 , into which the punch 17 dips and which opens into a scrap channel 2010 .

Usually it does not make sense to introduce embossings in the type of recessed grip M in a drawing stage by means of a correspondingly contoured die and a correspondingly contoured punch. Unrest, waviness, raised edges, flat or sinking points on or around the recessed grip M, which represent intolerable surface defects on the body part, are often the result. Therefore, such embossings are often formed in subsequent operations with different hold-down and mold inserts.

The proposed variant of the figures 12 and 13A to 13G facilitates the achievement of a component surface of high quality, since during the Shaping of the recessed grip M through the insert 16 of the sheet metal blank K' is still under biaxial tensile stress from the drawing and is held between the punch 2 and the inner die 1A. This tensile stress is superimposed on the states of stress that arise as a result of the embossing process in and around the recessed grip M and reduces the influence of the different processing lengths over the recessed grip M.

Contrary to what is shown in the figures 12 and 13A to 13G With deviating component geometries, holes can also be introduced independently of an embossing function, in that the punch 17 is guided in the inner die 1A. In this case, the inner die 1A then assumes the function of a hold-down device in the second adjustment phase for the perforation. Incidentally, it is easy to see that due to the support of the inner die 1A against the (upper air) bolts Bo, embossing and/or punching that deviates from the working direction of the press is also possible if appropriate drives are used for the embossing and/or cutting elements be provided.

the figure 14 also schematically illustrates a development of a composite tool W of figure 5 with punch attachment 2B integrated in punch 2. The punch attachment 2B is only separated from the punch surface 20 of the punch 2, which interacts with the inner die 1A, via the insertion area E for the cutting edge 9. The punch attachment 2B interacting with the separate hold-down device 1C of the upper part 5 is not spatially separated from the punch 2 as in the previously explained variants, but is part of the punch 2. An integration of the punch attachment 2B in the punch 2 is of course also included the previously explained variants possible.

the Figures 18, 18A and 18B as well as the figures 19 and 20 illustrate a further development of a composite tool figures 5 and 6A to 6G .

• Im Randbereich I liegt eine Schneidkante 900, die sich an einer Schneidleiste der Schneide 9 befindet, innen an der inneren Matrize 1A. Der Stempel 2 dient als starre Gegenschneide.
• Im Randbereich II liegt die Schneidkante 900 außen am Niederhalter 1C. Die Stempelankonstruktion 2B dient als Gegenschneide. Die Schneide 9 erfüllt hier ebenfalls die Funktion einer Abkantleiste.

the figure 18 shows here first a body part K, which has different edge areas I, II and III. A first edge area I is finished after drawing and trimming. Edge regions II adjoining here are subjected to beveling after a laid out shelf Ka has been pulled and trimmed. In the edge regions I and II, the movable cutting edge 9 must therefore be designed differently, as shown in FIG Figures 18A and 18B is illustrated, the different cutting edge sections 900A, 900B for a cutting strip for the production of the body component K of FIG figure 18 demonstrate:

• In the edge area I is a cutting edge 900, which is located on a cutting bar of the cutting edge 9, on the inside of the inner die 1A. The stamp 2 serves as a rigid shearbar.
• In the edge area II, the cutting edge 900 lies on the outside of the hold-down device 1C. The punch attachment 2B serves as a shearbar. The cutting edge 9 also fulfills the function of a folding strip here.

The cutting edge 900 of the cutting strip thus has first cutting edge sections 900A, second cutting edge sections 900B and transition regions 901 located in between. In relation to a direction pointing from the inner die 1A to the outer die 1B, the first cutting edge sections 900A are each on the inside and the second cutting edge section 900B is on the outside, so that the first cutting edge sections 900A form an inner contour of the cutting edge 900 and the second cutting edge section 900B an outer contour of the Cutting edge 900 are defined. 1.

1. 1. Im zweiten Randbereich II der Abkantung ist die Schneide 9 so ausgeführt, dass ein zweiter Schneidkantenabschnitt 900B gegenüber einem Schneidkantenabschnitt 900A für einen ersten Randbereich I um ein gewisses Maß vorsteht bzw. vorläuft. Dieses Maß beträgt je nach Bauteilgeometrie, Prozess, Blechwerkstoff und -dicke z.B. 0,5 mm bis 3,0 mm, insbesondere 0,7 mm bis 1,4 mm. Dadurch wird der Beschnitt im zweiten Randbereich II zuerst vollzogen.
2. 2. Nachdem der Schnitt im zweiten Randbereich II ausgeführt ist, arbeitet sich die Schnittkante 900 mittels der (mit Höhenversatz ausgebildeten) Übergangsbereiche 901 der Schneide 9 und hier vorgesehene Schneidflächen 9000 schälend über die Übergangsrandbereiche III zu den ersten Randbereichen I vor. Dabei wird der abzukantende Bord Ka im zweiten Randbereich II über eine Abkantfläche 902 der Schneide 9 bereits leicht angebogen.
3. 3. Anschließend werden die ersten Randbereiche I geschnitten. Im weiten Hub kann der Abfall in den ersten Randbereichen I nach unten gedrückt werden, während er gleichzeitig vom Blechhalter 3 nach außen gezogen wird.

A transitional edge region III lies between the first and second edge regions I and II. As in the oblique view from below of the cutting edge 9 in FIG figure 19 is shown, the cutting edge 9 is designed for this purpose in such a way that in a transition area 901 the cutting edge 900 runs from the inner contour to the outer contour of the cutting strip. However, this transition for a trimming contour KC implies that in the area between the punch 2 and the punch attachment 2B there is no shearbar in the (tool) lower part 4 in order to avoid uncontrolled deformation and/or intolerable tearing of the sheet metal. With this in mind, the compound tool shown provides the following:

1. 1. In the second edge region II of the bevel, the cutting edge 9 is designed in such a way that a second cutting edge section 900B projects or runs ahead by a certain amount in relation to a cutting edge section 900A for a first edge region I. Depending on the component geometry, process, sheet metal material and thickness, this dimension is, for example, 0.5 mm to 3.0 mm, in particular 0.7 mm to 1.4 mm. As a result, the trimming is carried out first in the second edge area II.
2. 2. After the cut has been made in the second edge region II, the cutting edge 900 works its way over the transition edge regions III to the first edge regions I by means of the transition regions 901 (designed with a height offset) of the cutting edge 9 and the cutting surfaces 9000 provided here. The edge Ka to be folded is already slightly bent in the second edge area II via a folded surface 902 of the cutting edge 9 .
3. 3. The first edge areas I are then cut. In the long stroke, the waste can be pressed down in the first edge regions I, while at the same time being pulled outwards by the sheet metal holder 3 .

The second cutting edge section 900B of the cutting edge 900, which defines the outer contour, thus protrudes here in relation to the first cutting edge section 900A, which defines the inner contour, so that when the die 1 and the punch 2 are pressed against one another, the cutting edge 9 first cuts its cutting edge 900 by means of the second cutting edge section 900B a second (subsequently bevelled) edge region II, before the cutting edge 9 carries out a trimming in the first edge regions I by means of the first cutting edge section 900A of its cutting edge 900.

Furthermore, in the present case for the first edge region I, a counter-holder 8, which is at least partially complementary to the cutting edge 9, is provided in the (tool) lower part 4, which in the plan view of FIG figure 20 is shown. This counterholder 8 is in its upper position during the trimming of the second edge areas II and the transitional edge areas III and acts as a counterknife in the transitional edge area III. As a result, uncontrolled tearing in the transitional edge region III is limited to a minimum length or even completely prevented. After trimming in the second edge areas II and the transitional edge areas III, the cutting edge 9 sits in the first edge area I on the counterholder 8 and begins to displace it downwards (in the adjustment direction Vu) against a defined force as the press stroke progresses.

The possibility of using a separate counterholder 8 in the area of the fold is unaffected if this is opportune for the component and/or the process. The counter-holder 8 for cutting and the counter-holder 8 for folding can also be made in one piece with a corresponding structural design and/or be supported against the same pressure elements in the lower part 4 .

If a counter-holder 8 is used from the outset for folding in the second edge area II, its contour in the transitional edge area III can also be designed as a bottom cutter. In this case, the trimming is carried out in advance in the first edge area I and then peels over the transition edge area III. Finally, the second edge area II is then cut and folded.

Incidentally, the described function and tool design do not necessarily imply full-edged cutting in the first and second edge regions I and II. Crossing or peeling cutting can also be provided here as required.

In one embodiment variant, a cutting insert is provided on the upper or lower blade in the transition area 901 . Its cutting edge then protrudes by a distance of 0.5 mm to 3.0 mm compared to those of the cutting bar(s) in edge areas I and II. The cutting insert cuts into the transition edge region III and is then displaced so far that its cutting edge is at the same level as that of the first and second edge regions I and II. Then, the cutting edge portions 900A, 900B are engaged in the first and second edge portions I and II.

• Durch die Reduzierung der Gesamtzahl der zur Fertigung eines Bauteils erforderlichen Werkzeuge bzw. Werkzeugstufen kann eine Reduzierung der Betriebsmittelkosten sowie der Entwicklungs- und Beschaffungszeiten erzielt werden.
• Durch die Verkürzung der Prozessketten können vorhandene Pressen(linien) effizienter ausgelastet, Rüst- und Wartungskosten minimiert werden.
• Treten Änderungen am Bauteil (z.B. durch den Bauteilentwickler) auf oder sind am Werkzeug (z.B. zur Kompensation von Rückfederungserscheinungen) erforderlich, sind weniger Werkzeugwirkflächen zu überarbeiten. Im Gegensatz zur Überarbeitung ganzer Werkzeugsätze können hierdurch Zeit und Kosten gespart werden.
• Durch die Reduzierung von Handlings-Operationen zwischen einzelnen Werkzeugen wird die Gefahr verringert, das Bauteil dabei zu deformieren, zu verkratzen oder anderweitig zu beschädigen.
• Durch die Verkürzung der Prozesskette verringert sich die Gefahr, dass Flitter, Staub, Oxid- oder andere Partikel in Folgewerkzeuge verschleppt werden, wo sie zu Beschädigungen der Oberfläche führen. Selbiges gilt für Abdrückungen, die beim Schließen der Werkzeuge auf der Bauteiloberfläche entstehen können. Durch Integration aller Bearbeitungsschritte in einem Verbundwerkzeug werden diese Gefahren gänzlich eliminiert.
• Durch die Reduzierung der Werkzeugstufen wird die Gefahr verringert bzw. eliminiert, dass beim Schließen des Folgewerkzeugs eine Deformation des Bauteils auftritt, infolge z.B. von nicht prozesssicher kompensierter Rückfederung aus dem voranstehenden Werkzeug.
• Insbesondere bei flachen, schwach konturierten Bauteilen ohne Löcher besteht nach dem Stand der Technik das Problem, das Bauteil auf dem Folgewerkzeug präzise und verrutschsicher zu positionieren. Durch die Integration von Folgeoperationen, die nach dem Beschnitt erfolgen würden, ist dieses Problem obsolet, da ein Umlegen des Bauteils in das Folgewerkzeug entfällt.

The solution according to the invention, illustrated by way of example on the basis of the exemplary embodiments described above, can offer advantages in several respects:

• By reducing the total number of tools or tool stages required to manufacture a component, a reduction in resource costs and in development and procurement times can be achieved.
• By shortening the process chains, existing presses (lines) can be utilized more efficiently, set-up and maintenance costs can be minimized.
• If changes are made to the component (e.g. by the component developer) or are necessary on the tool (e.g. to compensate for springback phenomena), fewer effective tool surfaces need to be revised. In contrast to the revision of entire sets of tools, this saves time and money.
• By reducing handling operations between individual tools, the risk of deforming, scratching or otherwise damaging the component is reduced.
• The shortening of the process chain reduces the risk of flakes, dust, oxide or other particles being carried over to subsequent tools, where they will damage the surface. The same applies to impressions that can occur on the component surface when the tools are closed. By integrating all processing steps in a compound tool, these dangers are completely eliminated.
• By reducing the number of tool stages, the risk is reduced or eliminated of deformation of the component occurring when the subsequent tool is closed, for example as a result of springback from the preceding tool that is not compensated for in a process-reliable manner.
• In the case of flat, weakly contoured components without holes, the prior art poses the problem of positioning the component on the subsequent tool precisely and in a manner that prevents it from slipping. With the integration of follow-up operations that would take place after trimming, this problem is obsolete, as there is no need to transfer the component to the follow-up tool.

The characteristic design features of the individual variants can be freely combined with one another within the scope of the invention, as defined by the claims. In principle conceivable, but not shown, is the integration of slide functions into the composite tool W, with which local cutting, perforating or forming operations can be implemented in a manner deviating from the working direction of the press.

Reference List

1

(Drawing) die / die assembly

10A, 10B

die surface

10C

clamping surface

110A

Surface

11A

bending bar

11B

(cutting) edge

12B

Projection (1st positive locking area)

13B

rounding

16

(embossing) insert

17

punch

19B

recess

1A

inner matrix

1B

Outer die

1C

hold-down

2

(Pull) Stamp

20

stamp face

201

embossing cavity

2010

scrap channel

20B

clamping surface

21

recess

210

Stepped molding surface

21a, 21b

Step

22

Recessed side wall

2 B

stamp attachment

3

sheet metal holder

30

blank holder surface

32

Deepening (2nd form-fitting area)

4

lower part

40

passage opening

5

top

50

passage opening

6

table

60

passage opening

7

pestle

70

passage opening

8th

counter holder

80

holder surface

9

cutting edge

900

cutting edge

9000

cutting surface

900A, 900B

cutting edge section

901

Transition area with height offset

902

bevel surface

90a, 90b

cutting section

A

waste piece

bo, bu

bolt

E

insertion area

F1, F2

spring element

go, goo

gas spring

K

Body part (sheet metal part)

K'

blank

ca

edge section / board

KB

board

KC

crop contour

KF

flange

L1, L2

Hole

L.A

punch waste

M

recessed grip

O

superstructure (first structure)

P

embossing

R

space

s

cutting gap

u

substructure (second structure)

vo, vu

adjustment direction

W

compound tool

Z

spacer

α, β

angle

Claims (15)

1. A composite tool for producing a flat sheet metal component (K), comprising a first structure (O) including a drawing die (1) and a second structure (U) including a drawing punch (2), wherein at least the first structure (O) or the second structure (U) is at least partially translationally adjustable, and at least one blank holder (3) translationally adjustable relative to the drawing punch (2) is provided on the second structure (U) in addition to the drawing punch (2), in order to press the drawing die (1) and the drawing punch (2) against each other and to form the sheet metal component (K) by drawing from a sheet metal blank (K') located between the drawing die (1) and the drawing punch (2) and configured as an individual sheet bar, wherein the blank holder (3) is adapted to hold an outer edge of the sheet metal blank (K') to be drawn on the blank holder (3),
   wherein

   - the drawing die (1) of the first structure (O) is of at least two-part design with an inner die (1A) and an outer die (1B), wherein the inner die (1A) and the outer die (1B) are adjustable relative to each other on the first structure (O), and

   - the outer die (1B) and the blank holder (3) translationally adjustable relative to the drawing punch (2) face each other and, when the two-part drawing die (1) and the drawing punch (2) are pressed against each other, are adapted to hold a scrap piece (A) of the sheet metal blank (K) between them, which is cut off at the outer edge of the drawn sheet metal blank (K') when the drawing die (1) and the drawing punch (2) are pressed against each other,

   characterized in that
   a cutting edge (9) is provided on the first structure (O) for cutting off the scrap piece (A), and a punch addendum (2B) is additionally provided on the second structure (U), which is arranged between the blank holder (3) and an insertion region (E) for the cutting edge (9) of the first structure (O).
2. The composite tool according to claim 1, characterized in that the first structure (O) and the second structure (U) are adapted to form, with the pressing of the drawing die (1) and the drawing punch (2) against each other, also an edge portion (Ka) of the sheet metal component (K) at which a separating edge obtained by cutting off the scrap piece (A) is present, wherein the first structure (O) and the second structure (U) are adapted to bevel the edge portion (Ka) of the sheet metal component (K), at which the separating edge is present, by pressing the drawing die (1) and the drawing punch (2) against each other after the scrap piece (A) has been cut off.
3. The composite tool according to claim 1 or 2, characterized in that

   (a) the outer die (1B) of the first structure (O) at least partially encloses the inner die (1A) and/or

   (b) the inner die (1A) is adjustable on the first structure (O) relative to the outer die (1B) or the outer die (1B) is adjustable on the first structure (O) relative to the inner die (1A).
4. The composite tool according to any of the preceding claims, characterized in that the blank holder (3) for drawing and edge trimming the sheet metal blank (K') is translationally adjustable when the two-part drawing die (1) and the drawing punch (2) are pressed against each other.
5. The composite tool according to claim 4, characterized in that the blank holder (3)

   - is adjustable on the second structure (U) relative to the drawing punch (2) into an insertion position towards the outer die (1B), in which the sheet metal blank (K') is to be arranged with an edge-side portion on the blank holder (3), and

   - when the drawing die (1) and the drawing punch (2) are pressed against each other, is adjustable relative to the drawing punch (2) into a holding position different from the insertion position, in which the scrap piece (A) cut off from the sheet metal blank (K') is held between the outer die (1B) and the blank holder (3).
6. The composite tool according to any of the preceding claims, characterized in that

   (a) by the translational adjustment of the first structure (O) and the second structure (U) towards each other, the blank holder (3) is adjustable relative to the punch (2) and/or the inner and outer dies (1A, 1B) are adjustable relative to each other, and/or

   (b) on the first structure (O) a hold-down device (1C) is provided in addition, which is arranged between the inner die (1A) and the outer die (1B), and/or

   (c) the first structure (O) and the second structure (U) are adapted, with the pressing of the drawing die (1) and the drawing punch (2) against each other, to cut off the scrap piece (A) by shearing by means of a relative movement between the outer and inner dies (1A, 1B).
7. The composite tool according to any of the preceding claims, characterized in that

   (a) the cutting edge (9) is mounted on the outer die (1B), or

   (b) the inner die (1A) of the at least two-part drawing die (1) is adjustably mounted on the first structure (O) relative to the cutting edge (9).
8. The composite tool according to claim 7, characterized in that, with the cutting edge (9) provided on the first structure (O), relative to which the inner die (1A) of the at least two-part drawing die (1) is adjustably mounted on the first structure (O), the cutting edge (9) is formed with a cutting bar, which (a) when the drawing die (1) and the drawing punch (2) are pressed against each other, at the same time acts as a beveling bar or which (b) when the drawing die (1) and the drawing punch (2) are pressed against each other, cooperates with a counter-holder (8) and acts as a beveling bar against this counter-holder (8).
9. The composite tool according to claim 8, characterized in that a cutting edge (900) of the cutting bar comprises at least one first cutting edge portion (900A) and at least one second cutting edge portion (900B), wherein, with respect to a direction pointing from the inner die (1A) to the outer die (1B), the at least one first cutting edge portion (900A) is located on the inside and the at least one second cutting edge portion (900B) is located on the outside, so that an inner contour of the cutting edge (900) is defined with the at least one first cutting edge portion (900A) and an outer contour of the cutting edge (900) is defined with the at least one second cutting edge portion (900B).
10. The composite tool according to claim 9, characterized in that

    (a) the at least one second cutting edge portion (900B) defining the outer contour of the cutting edge (900) protrudes with respect to the at least one first cutting edge portion (900A) defining the inner contour, and/or

    (b) the counter-holder (8) cooperating with the cutting bar is configured and provided to act as a counter-knife for a transition region (901) of the cutting edge (900), at which the cutting edge (900) passes from the at least one first cutting edge portion (900A) into the at least one second cutting edge portion (900B), when the drawing die (1) and the drawing punch (2) are pressed against each other, and/or

    (c) the counter-holder (8) cooperating with the cutting bar is configured and provided, when the drawing die (1) and the drawing punch (2) are pressed against each other, to be displaced by the cutting edge (9) resting against the counter-holder (8) with the at least one first cutting edge portion (900A) after trimming of the sheet metal blank (K') has been carried out by means of the at least one second cutting edge portion (900B).
11. The composite tool according to any of the preceding claims, characterized in that the first structure (O) and the second structure (U) are adapted, with the pressing of the drawing die (1) and the drawing punch (2) against each other, to provide the sheet metal component (K) with at least one embossment (M, P) at an edge portion (Ka) of the sheet metal component (K) at which a separating edge obtained by cutting off the scrap piece (A) is present.
12. The composite tool according to claims 7 and 11, characterized in that, with the cutting edge (9) provided on the first structure (O), relative to which the inner die (1A) of the at least two-part drawing die (1) is adjustably mounted on the first structure (O), the cutting edge (9) is formed with a cutting bar which, when the die (1) and the drawing punch (2) are pressed against each other, at the same time acts as a beveling bar and as a forming bar for providing the embossment (P), in order to provide the embossment (P) on a flared rim of the edge portion (Ka).
13. The composite tool according to any of the preceding claims, characterized in that an insert (16) is provided on the first structure (O), by means of which an embossment (M) is incorporated during drawing or after completion of drawing, and/or on the first structure (O) a punch (17) furthermore is provided for producing at least one hole (L1, L2) on the sheet metal component (K).
14. The composite tool according to claim 13, characterized in that the punch (17) for producing the at least one hole (L1, L2) is provided on the embossment (M) produced by means of the insert (16), and the insert (16) is adjustably mounted on the first structure (O), so that after production of the embossment (M) in a first adjustment phase, the insert (16) is displaced in a subsequent, second adjustment phase during further pressing of the drawing die (1) and the drawing punch (2) against each other, and the punch (17) produces the at least one hole (L1, L2).
15. A method for producing a flat sheet metal component (K) by means of a drawing device which comprises a first structure (O) including a drawing die (1) and a second structure (U) including a drawing punch (2), wherein at least the first structure (O) or the second structure (U) is at least partially translationally adjusted, and at least one blank holder (3) translationally adjustable relative to the drawing punch (2) is provided on the second structure (U) in addition to the drawing punch (2), in order to press the drawing die (1) and the drawing punch (2) against each other and to form the sheet metal component (K) by drawing from a sheet metal blank (K') located between the drawing die (1) and the drawing punch (2) and configured as an individual sheet bar, wherein an outer edge of the sheet metal blank (K') to be drawn is held on the blank holder (3),
    wherein

    - the drawing die (1) of the first structure (O) is of at least two-part design, with an inner die (1A) and an outer die (1B), wherein the inner die (1A) and the outer die (1B) are adjustable relative to each other on the first structure (O), and

    - the outer die (1B) and the blank holder (3) translationally adjustable relative to the drawing punch (2) face each other, and the outer die (1B) and the blank holder (3) hold a scrap piece (A) of the sheet metal blank (K') between them when the two-part drawing die (1) and the drawing punch (2) are pressed against each other, which is cut off at the outer edge of the drawn sheet metal blank (K') with the pressing of the drawing die (1) and the drawing punch (2) against each other,

    characterized in that
    a cutting edge (9) is provided on the first structure (O) for cutting off the scrap piece (A), and a punch addendum (2B) additionally is provided on the second structure (U), which is arranged between the blank holder (3) and an insertion region (E) for the cutting edge (9) of the first structure (O).

Images