EP3509772A1

EP3509772A1 - Method and device for producing formed, in particular flanged, sheet metal components

Info

Publication number: EP3509772A1
Application number: EP17768378.6A
Authority: EP
Inventors: Thomas Flehmig; Martin Kibben; Daniel Nierhoff
Original assignee: ThyssenKrupp Steel Europe AG; ThyssenKrupp AG
Current assignee: ThyssenKrupp Steel Europe AG; ThyssenKrupp AG
Priority date: 2016-09-07
Filing date: 2017-08-30
Publication date: 2019-07-17
Also published as: CN109689243A; DE102016116758A1; MX2019002585A; US20190193136A1; WO2018046356A1; CN109689243B

Abstract

The invention relates to a method for producing a formed, in particular flanged, component wherein the method comprises: preforming a workpiece (3a) into a preformed component (3b), and sizing the preformed component (3b) to a substantially finished component (3c). The object of increasing the hardness in the component and of expanding the range of application to components which, within the constraints of the prior art methods, could not hitherto be drawn without folds, i.e. in particular to form concave components, is achieved in that the sizing of the preformed component (3b) to the finished component (3c) includes stretching at least some parts of the preformed component (3b). The invention further relates to a device for producing a formed, in particular flanged, component.

Description

Method and device for producing shaped, in particular flange-shaped, sheet-metal components

The present invention relates to a method for producing a shaped, in particular flanged, sheet metal component, the method comprising preforming a workpiece into a preformed component and calibrating the preformed component to a substantially finished molded component. The invention further relates to an apparatus for producing a molded, in particular

flange-shaped sheet metal component, in particular for carrying out a

A method according to the invention comprising one or more preforming tools for preforming a workpiece into a preformed component and having one or more calibration tools for calibrating the preformed component to a substantially finished molded component.

By sheet metal formed components, such as thermoformed components usually require a final edge trimming, are cut off in the excess areas of the example, thermoformed component. In the case of flanged parts, this can be done, for example, by one or more trimming tools that partially or wholly trim the flange from above or obliquely in the desired manner. In the case of flangeless parts, however, trimming is already considerably more complicated because it has to be cut off from the side, for example, via a wedge slide. However, the trimming operations are disadvantageous in that trimming usually requires one or even several separate, often maintenance-intensive operations, which moreover frequently require their own tool technology and logistics system. In addition, the cut areas increase the scrap content, resulting in additional costs. For example, in the case of components which are formed by means of edges or embossing, the final edge trim can also be dispensed with. In order to shorten at least the process chain, different approaches were followed, with which, inter alia, the Flanschbeschnitt was integrated into the last forming operation, such as deep drawing operation. This can already be done achieve significant cost savings, but some remain

Disadvantages, such as the accrual of waste, the creation of complicated tools, a costly testing, unwanted springback effects,

Limited dimensional stability and susceptibility to process disturbances.

For this reason, methods and devices have been proposed to the edge trimming of particular U-shaped or hutprofilartigen components

save or greatly reduce

For example, German Offenlegungsschrift DE 10 2007 059 251 A1 describes a process for the production of high-density half-shells with a base region and a frame with low expenditure on equipment. For this purpose, a preformed half shell is first formed from a circuit board. The entire cross section of the preformed half shell has excess board material due to its geometric shape.

During the forming of the preformed half shell into its final shape by at least one further pressing operation, the entire cross section is compressed to form the finished half shell and the finished half shell has an increased wall thickness over the entire cross section.

German Offenlegungsschrift DE 10 2008 037 612 A1 likewise describes a method for producing highly dimensionally stable half shells with a base region, a frame region and a flange region, wherein first of all a preformed half shell is formed from a blank, which subsequently forms the final molded article

Half shell is reshaped. The preformed half shell has excess board material due to its geometric shape. Due to the excess material, the half-shell is compressed to the final-formed half-shell during the forming of the preformed half shell into its final shape by at least one further pressing operation. The preformed half shell has the excess

Board material in the transition area between the frame area and the flange area. The German patent application DE 10 2009 059 197 Al describes a method for producing a Haibschalenteils with a drawing punch and a drawing die. A process-reliable and cost-effective production is achieved in that in a single step, the drawing punch is moved into the drawing die, a board to a sheet metal blank with at least one bottom section, at least one

Zargenabschnitt and optionally a flange portion is preformed, wherein during the preforming with the drawing punch excess material either in the

Bottom portion and the frame portion or the optional flange portion of the sheet metal blank is introduced, and the sheet metal blank is preformed and calibrated into a sheath shell part.

German Offenlegungsschrift DE 10 2013 103 612 A1 likewise describes a method for the production of half-shells with high dimensional accuracy, wherein a half-shell preformed from a blank is formed into a finished half-shell and the preformed half-shell is excess due to its geometric shape

Board material has. The half shell will be in

compressed a compression tool to the final molded half shell. It is envisaged that the size of the upsetting gap during the closing of the upsetting tool is reduced to the actual wall thickness of the frame of the preformed half shell.

The German patent application DE 10 2013 103 751 AI describes a method for producing high-scale half-shells from a cut board, wherein the half-shell is preformed in a first die, and wherein the preformed half-shell then in a second die, in particular in a

Calibration tool, is final formed. Taking into account the desired final shape of the preformed or demoulded half shell, the blank is cut to a positive dimensional deviation within the given tolerance range before forming, and the die bottom of the first die is cut relative to the die

Die pad moves to guide the board during forming. The approaches described have in common that in a first or several (first) process steps, a preform is generated, which comes as close as possible to the final shape or finished shape of the component, but with the difference that in the

Component sections such as flange, frame, transition region between flange and frame and / or bottom defined material reserves are introduced, which are formed out in a second process step by a special compression of the entire part during calibration again.

Although this known method eliminates the abovementioned disadvantages, it itself has undesirable side effects.

On the one hand, it has been found that the upsetting of the sheet can sometimes produce slight waves in the finished-molded component, if the spacing between the upsetting die and the upset punch during calibration does not correspond exactly to the sheet thickness. These waves can represent a visual or dimensional defect.

Furthermore, it has been found that can also change the local sheet thicknesses by the upsetting process. This results in ripples, which can also represent optical limitations. Previous efforts go to reduce the compression parts as possible.

On the other hand, upsetting of the preformed component, especially in the case of large parts, wall thicknesses or / and high-strength steels, requires very massive tools in order to avoid undesired deformation. It also very high press forces are required, which can exceed existing press capacities and thus lead to restrictions on the feasibility.

As it turned out in simulations, it is also poorly possible with the already mentioned method, especially tub or pot-like components

because the mentioned method for producing the preform process technology should be guided so that no or only small process fluctuations caused by the friction conditions and changes to the typical process variables such as friction and hold-down force are severely limited. If you subject such trough-like parts of this procedure, the train is not enough on the frames and the part gets in these places more or less strong wrinkles, which can not be smoothed in the calibration step, however, to the desired extent again.

Furthermore, the material minimization in the methods described above is not yet exhausted, since the components with about 1 to 3% material addition to the actual component design (CAD part) must be made. They are therefore at least to this extent heavier than conventional thermoformed parts.

Ultimately, the possibility of solidification of the material in the aforementioned method is not yet exhausted. Although this may have advantages for the crash behavior of the component, but is not desirable for all components and not always optimal.

Against this background, the invention has the object to provide a generic method and a generic device, wherein the disadvantages mentioned are reduced or even eliminated, that is, in particular the solidification in the component is stronger and the range of applications to components with the boundary conditions of Previously, methods from the prior art can not be drawn without wrinkles, that is to say, in particular, be extended to pan or cup-shaped components, in particular with a small sheet thickness.

The object is achieved in a generic method in that the calibration of the preformed component to the finished molded component comprises an at least partially extending the preformed component.

It has been found that, in that if the calibration of the preformed component to the finished molded component is not limited to an upsetting operation, but also a stretching of the preformed component is carried out very dimensionally stable and So that substantially close to the final components can be manufactured. In particular, it has been found that introduced by the stretching during preforming

Material surveys can be balanced again or smoothed. In this respect, a component can be produced in this way, which requires no or only a small edge trimming. In addition, because the stretched areas at least partially do not necessarily need to be compressed, a lower force is sufficient in addition to the methods according to the prior art. By stretching is meant that a direction-independent plastic deformation takes place and thereby a realignment of the inhomogeneous stress state of the preform is achieved and thereby high-dimensional, close to the final form close components can be produced.

The method is particularly advantageous in the case of trough-shaped, cup-shaped or cup-shaped components, since these were not or not economically available to the previously described methods. The component therefore preferably has a bottom region, a frame region and / or a flange region. Of the

Zargenbereich runs, for example, obliquely or substantially perpendicular to the floor area and / or the frame area.

The workpiece is, for example, a substantially planar board. Preferably, the workpiece is made of one or more steel materials. Alternatively, aluminum materials or other metals may be used.

The preparation of the preform can be combined by means of any desired

Shaping process can be produced in one or more steps. The preforming may include, for example, a deep-drawing-type forming step. In particular, a multi-stage shaping including, for example, an embossing of the floor to be created and raising the frames to be created or optionally stopping the flanges to be created can take place. Also conceivable are any combinations of folding and / or bending and / or (compression) embossing. The pre-forming, for example, carried out deep drawing is, for example, single-stage or executed in several stages. The preformed component obtained by preforming can in particular be regarded as a component which is as close to the final shape as possible and which corresponds as well as possible to the intended finished part geometry taking into account given boundary conditions such as springback and forming capacity of the material used.

Calibration can be understood in particular to be a finish molding or final shaping of the preformed component, which can be achieved, for example, by one or more pressing operations. The substantially finished molded component can be understood as a final molded component. However, it is possible that the substantially finished molded component may be subjected to further component modifying processing steps, such as insertion of tie holes or a (minor) trim operation. However, the aim is to make the calibration form such that no further

Forming steps are more necessary.

The preforming and calibrating described preferably takes place successively. However, it is also conceivable that there is a temporal overlap between preforming and calibrating.

According to one embodiment of the method according to the invention, a region, in particular a frame region of the preformed component with respect to the

finished molded component formed with a lack of material. It has been shown that, contrary to the previous approaches from the prior art, the preformed component need not be equipped with an additional material supply (excess material) in order to achieve a sufficient dimensional stability. Rather, the method according to the invention turns away from this and provides to provide a material shortage in some areas. A lack of material is understood to mean that in the preform to be produced in local areas, the unwinding of the sheet is smaller than the corresponding area in the finished-molded component. During the

Calibration, the material is stretched accordingly, the lack of material in the Surface is compensated by reducing the material thickness. In particular, in the frame area, a material shortage has proven to be advantageous compared to the finished molded component. Alternatively or additionally, if necessary, a bottom region of the preformed component may be formed with a lack of material. Contrary to expectations, despite the lack of material, a sufficiently strong and dimensionally stable component can be manufactured.

According to one embodiment of the method according to the invention, a region, in particular a frame region, of the preformed component is dimensioned smaller in comparison with the substantially finished-shaped component with respect to a geometric size. As a result, a material shortage in the corresponding area can be advantageously provided and without great process engineering effort. For example, the frame portion of the preformed component is smaller in size with respect to the circumference. In other words, the preformed component has a smaller inner circumference than the substantially finished molded component. If required, alternatively or additionally, the bottom area can be dimensioned smaller, for example with regard to its diameter. For example, the range in terms of geometric size about 0.1 to 10%, in particular about 1 to 10% smaller.

According to one embodiment of the method according to the invention, material elevations are permitted during preforming of the workpiece to the preformed component (for example by deep-drawing). In contrast to the prior art, therefore, no attempt is made any material surveys, for example by the

Introducing tensile stresses to suppress. Rather, these are

Material surveys now exploited to produce a dimensionally stable component with reduced pressing forces. For example, the material elevations resulting during the production of the preform are wave-shaped and / or fold-shaped. For example, the material elevations extend in a substantially radial direction or in a direction deviating therefrom. For example, arise during preforming in the flange area, in the frame area and / or in the floor area material elevations.

According to one embodiment of the method according to the invention are

Material surveys permitted by the example Provision of an air gap and / or a hold-down distance in the field of material collection. By providing, for example, an air gap or a hold-down distance of the

used tool (preforming tool), the formation of a

Material collection are advantageously integrated into the example press-based deep drawing. It has been found that the formation of the material elevations can be guided in a controlled manner by providing, for example, an air gap or a hold-down distance. For example, the air gap is formed between a preform die and a preform punch. For example, the air gap in cross-section is more than 0.1 times, preferably more than 0.3 times, more preferably more than 0.5 times the sheet thickness. However, in order not to allow too uncontrolled material surveys, for example, the air gap is not more than 10 times, preferably not more than 7 times, preferably not more than 5 times the sheet thickness.

According to one embodiment of the method according to the invention are

Material surveys targeted via the preforming tool or preforming tools introduced. Thus, it is advantageously possible to produce such preforms process reliable, which increasingly tend due to their geometric shape to wrinkling. By means of deliberately introduced material elevations, therefore, also those components which tend to fold are made accessible to the method according to the invention.

According to one embodiment of the method according to the invention are

Material surveys essentially free of material thickening. The

Material surveys include, for example, seen in cross-section only wavy and / or fold-shaped geometries, but without changing the sheet thickness in this area. It has been shown that the material thickening by Calibration can not be calibrated out sufficiently. In addition, no additional pressing forces are necessary for the forming without significant material thickening.

According to one embodiment of the method according to the invention are

Material elevations stretched by the stretching of the preformed component.

In particular, when the material elevations are provided in the frame area, the material elevations are preferably stretched in the circumferential direction. In this case, for example, material from the frame area and / or the floor area

used. It has been found that, despite the permitting of material elevations, they can be removed again by stretching, without this being disadvantageous optically for the essentially finished-shaped component.

According to one embodiment of the method according to the invention, an area, in particular a frame area or a flange area, of the preformed component is dimensioned larger in comparison with the substantially finished-shaped component with regard to a geometric size. For example, the frame area has a greater length (ie, the preformed component has a greater height) compared to the substantially finished-shaped component. For example, the

Flange area a greater length (the flange of the preformed component so a greater radial extent) compared to the substantially finished molded component. This allows an additional compression of the preformed component during calibration, which further increases the strength and dimensional stability of the component, but without exceeding the available pressing forces.

According to one embodiment of the method according to the invention, the calibration of the preformed component to the substantially finished molded component comprises an at least partial upsetting of the preformed component. As already stated, the strength and dimensional stability of the component can be increased by upsetting. For example, material of the flange is at least partially compressed. The material is doing by the described material surveys in Flange area or by the described larger dimensions (greater length) of the flange provided. For example, material of the frame area is at least partially compressed. The material is characterized in particular by the described larger dimensions (greater length) of the Zargenbereichs

provided. For example, upsetting is followed by stretching.

However, in spite of the additional upsetting, in the method preferably portions of the preformed member are merely stretched but not upset.

According to one embodiment of the method according to the invention, the preformed component is calibrated essentially in the entire component or only

partially subjected to a plastic flow. This is done in the

Zargenbereich preferably a stretching and / or upsetting, in the flange preferably a compression and in the bottom region, preferably a compression.

As a result, a very dimensionally stable component is achieved with substantially low to no springback deviations.

The object mentioned above is also achieved in a generic device in that the preform tool and the calibration tool are set up such that the calibration of the preformed component to that in the

Essentially finished molded component comprises an at least partially extending the preformed component. This can be achieved, for example, by appropriate dimensioning of the tool parts (for example, the tool punch and / or tool dies).

As already explained, by calibrating the preformed component to the substantially finished molded component, which comprises stretching the preformed component, very dimensionally stable, finished-shaped components can be manufactured. In the process, it has been shown that material elevations introduced by stretching during preforming can be compensated so that a component that is not impaired optically can be provided. Furthermore, the calibration with A lower force can be achieved and it is no or only a small edge trimming necessary.

For controlled formation of the material elevations according to an embodiment of the device according to the invention, the preform tool is adapted to allow during the preforming of the workpiece to the preformed component (for example, by deep drawing) material surveys, in particular by means of an im

closed state, for example, remaining air gap and / or a Niederhalterdistanz and / or the geometric design of the preforming tool / preform tools. The air gap is preferably formed between tool halves or tool parts of the preform tool.

According to one embodiment of the device according to the invention, the preforming tool comprises a preforming punch and a preforming die, and the air gap is formed, for example at least in sections, at least between the preforming punch and the preforming die. This allows in particular a controlled formation of material elevations in the frame area. If the material surveys are allowed by means of, for example, a hold-down distance, this includes

The preforming tool preferably includes at least a preform die and a preform hold-down, wherein the preform hold-down is maintained at a distance greater than the gauge from the preform die during preforming.

Preferably, the preform die includes a first (outer) preform die portion and a second (inner) preform die portion movable relative thereto, which forms the preform die bottom. This allows for the different areas (in particular the floor area compared to the other areas) of the component individual and timed

Applying force during preforming. In particular, the workpiece can be clamped or embossed between the preform punch and the preform die bottom and retracted by preform punch and preform die bottom into the first preform die portion. According to one embodiment of the device according to the invention, the calibration tool comprises a calibration punch and a calibration die, the calibration punch having a first (outer) calibration punch portion and a second (inner) calibration punch portion movable relative thereto which controls the calibration - Stamp base forms, comprises and / or wherein the calibration die comprises a first (outer) Kalibrier-Gesenkabschnitt and a relative thereto movable second (inner) Kalibrier-Gesenkabschnitt which forms the calibration die bottom. This allows for the different areas (in particular the bottom area in comparison to the other areas) of the component individual and timed force application during calibration. Thus, the calibration can also be advantageously carried out in particular within only one calibration tool.

Preferably, the apparatus is arranged such that the sizing die bottom and the sizing die bottom are distanced during stretching, which

in particular allows a flow of material from the bottom area in the Zargenbereich.

With regard to further embodiments of the device according to the invention, reference is made to the comments on the method according to the invention.

By the preceding and following description of method steps according to preferred embodiments of the method, corresponding means for carrying out the method steps by preferred embodiments of the device should also be disclosed. Likewise, by the disclosure of means for carrying out a method step, the corresponding method step should be disclosed.

In addition, the invention will be explained in more detail using an exemplary embodiment in conjunction with the drawing. The drawing shows in An embodiment of a preform tool according to the invention for carrying out an embodiment of an inventive

preforming;

5 shows an embodiment of a preformed component.

FIGS. 6-10 show an exemplary embodiment of a calibration tool according to the invention for carrying out an exemplary embodiment of a calibration according to the invention; and

Fig. 11 shows an embodiment of a substantially finished molded component.

1 to 4 show an embodiment of a preform tool 1 according to the invention. The exemplary preform tool 1 forms, together with the exemplary calibration tool 2 (see FIGS. 6 to 10), an exemplary embodiment of a device according to the invention. With the preforming tool 1, a

Embodiment of a preforming according to the invention are performed.

It is also possible that if required (if several preform operations are provided) also a plurality of individual preform sub-tools can be provided.

In the preforming tool 1, first a workpiece 3a, here a flat steel sheet, inserted and optionally fixed in position (Fig. 1). The preforming tool 1 includes a preform hold-down 4, a preform die 6 and a preform punch 8. The

Preform die 6 also includes a first outer preform die portion 6a which provides inter alia a preform die pad and a second inner preform die portion 6b or preform die bottom movable relative thereto. The preform Gesenkboden 6b is raised to the height of the workpiece 3a.

The individual tool parts of the preforming tool 1 are designed for receiving in a press. Unless additional auxiliary drives are used, the Preform punch 8, for example, on a press base plate, the preform hold-4 is, for example, by quills of the sub-air, the preform Gesenkboden 6b, for example, by quills of the upper air and the first preform die portion 6a, for example, by a die plate of the press

driven. In individual cases, however, the drives of the lower and upper air as well as die and punch can be reversed.

Subsequently, the preform punch 8 and the preform hold-down 4 are lowered onto the workpiece 3a (Fig. 2). The workpiece 3a may be stamped between the preform punch 8 and the preform die bottom 6b, while the preform blank holder 4 remains spaced from the workpiece 3a. The preform hold-down 4 is as far as the workpiece 3 a distanced that results in a constant hold-down distance, which is greater than or equal to the workpiece thickness results. Deep drawing takes place, for example, with the preform punch 8 and the preform die bottom 6b moving together into the preform die 6a, thereby converting the workpiece 3a into a preformed component 3b (FIG. 3). Alternatively, the so-called embossing can be used with high points, the hold-down can be completely eliminated. When embossing with high points, the fixed in its defined and repeatable position, previously determined by simulation or tryout workpiece (minimal form board) is first embossed with the raised preform Gesenkboden 6b and this composite of the three parts is then without

Hold-down pressed into the preform die 6a.

In the present case, the preform punch 8 and the preform die 6 are adapted to one another in such a way that an air gap 10 is formed (FIG. 4). Normally, an attempt is made to keep the air gap in the tool as small as possible, usually not greater than 0.1 times the workpiece thickness. Here, however, the air gap 10 is preferably 0.5 times to 5 times the workpiece thickness.

As a result, when preforming radially or otherwise directed waves 12 in the Zargenbereich the preformed component 3b (and optionally also in the bottom area and / or in the flange area) (see Fig. 5). This is achieved in particular in preformed components with an oblique or almost vertical Zargenbreich particular in that the train is missing due to the deceleration of the flange because of the non-existent or distanced preform hold-4.

The fact that an air gap 10 and a hold-down distance is provided which can take a multiple of the sheet thickness, the shafts 12 are not leveled by the contact with the tool parts 6 a, 8, so that no uncontrollable thickening arise.

As schematically illustrated in FIG. 5, as a result of the preforming, there is a preformed component 3b, the peripheral area of which is smaller by a certain amount (for example 0.1 to 10%) than the desired finished-molded component dictates in the frame area, in the floor area and / or in the

Flange region may preferably have radial waves 12, which have little or no thickening. In the present example, in particular the

Zargenbereich (and if necessary, the bottom portion) of the preformed component 3b in comparison with the finished molded component thus not equipped with a surplus of material, but with a lack of material. However, the height of the

Zargenbereichs the preformed component 3b slightly larger than the preformed component dictates. Additionally or alternatively, the length of the flange portion of the preformed member 3b may be larger than the final molded component dictates.

As will be described in more detail in connection with FIGS. 6 to 10, the preformed component 3b is then inserted into the calibration tool 2 and calibrated to form a finished molded component 3c (FIG. 11).

The calibration tool 2 comprises a calibration punch 20 and a calibration die 22. The calibration punch 20 has a first outer calibration punch portion 20a and a second inner calibration punch portion 20b or a calibration punch base movable relative thereto. The calibration die 22 includes a first outer one Calibration die portion 22a and a relatively movable second inner gauge die portion 22b or gauge die bottom. In addition, the first calibration die section 22a has a countersink 24 in the area of the flange of the preformed component 3b, so that a shoulder 26 projecting on the calibration die 22 fits in a form-fitting manner in the latter.

The calibration punch 20 and the calibration die 22 of the calibration tool 2 are designed so that in the end position the finished molded component is completely described by the cavity between them.

Also, the calibration tool 2 is designed for recording in a press. If no auxiliary drives are used, the calibration stamp base 20b

for example, by sleeves of the under-air, the calibration Gesenkboden 22b

for example, driven by the sleeves of the upper air. The first calibration die section 22a, for example, through the stamp plate of the press

driven, the first calibration stamp portion 20a is, for example, on the press base plate. In individual cases, lower and upper air and Gesenk and

Stamp be reversed.

As shown in Fig. 6, the preformed member 3b is first placed in a defined position on the raised calibration die bottom 22b or a part of the Kalibrier- Gesenkabschnitts 22a and there in a suitable manner, for example on

Guide pins or shaped elements, fixed in position. Subsequently, the calibrating die bottom 20b moves onto the calibration die bottom 22b, partially compressing the bottom region of the preformed component 3b (FIG. 7). However, this with a small, defined distance of about 0.5 times to 5 times the workpiece thickness. Continuing to move both floors 20b, 22b with the preformed component 3b and their distance from each other in their final position and remain there. The preformed component is now positioned on the height side within the calibration die 22, which is shown in FIG. 8 and enlarged in FIG. 9. In order to obtain the finished molded component 3c, the second, outer calibrating punch portion 20a of the calibrating punch 20 moves into the preformed component 3b and expands it more and more. The stretching thereby ensures that existing shafts 12 in the frame region of the preformed component 3b are circumferentially stretched and thereby removed and that the frame region of the preformed component 3b assumes the shape of the frame region of the finished molded component 3c. The material for the expansion takes the process both from the frame area as well as from the floor area, which is indeed not yet formed by the distancing final.

Shortly before reaching the end position shown in Fig. 10, the outer edge of the flange portion of the preformed component 3b reaches the vertical wall of the Kalibrierungs Gesenk 22. Thus, the expansion is almost complete. From this point begins a compression, in which the flange portion of the preformed component 3b, the length of the preforming and / or stretching is longer than the associated shoulder on the die (or alternatively the flange portion also has material elevations) is compressed to its final nominal length ,

At the same time so that the frame portion of the preformed component 3b, if it was possibly performed slightly longer than needed, compressed. At the same time as reaching the end position of the calibration punch 20, the spacing of the calibration punch base 22b from the calibration die base 20b is also eliminated so that the bottom region of the now finished molded component 3c is also finished at this time (FIG. 10).

In the end position, therefore, the material of all areas of the finished molded component 3c was subjected to a final flow process. It is thus expanded, compressed to form and is due to the plastic flow of all volumes very dimensionally stable and with little or no springback before.

Finally, the calibration tool 2 is moved apart and the im

Essentially finished molded component 3c, the little or no trim more needed, ejected. Since in the process larger areas are only widened and not compressed, the calibra- tion also results in a lower force requirement than in the methods from the prior art, in which essentially all surface areas of the part must be compressed.

The apparatus and method have been explained herein with reference to a member in the form of a cup having sloping frames. However, other component shapes are also possible and require correspondingly adapted tool contours.

Claims

P a n t a n s p r e c h e

Process for the preparation of a molded, in particular flange-shaped

Component, the method comprising:

Preforming a workpiece (3a) into a preformed component (3b); and calibrating the preformed component (3b) to a substantially finished molded component (3c);

characterized,

in that the calibrating of the preformed component (3b) to the essentially finished molded component (3c) comprises an at least partial expansion of the preformed component (3b).

Method according to claim 1, characterized in that an area,

in particular, a frame region of the preformed component (3b) with respect to the finished molded component (3c) is formed with a lack of material.

A method according to claim 1 or 2, characterized in that a region, in particular a frame region, of the preformed component (3b) in comparison with the substantially finished molded component (3c) with respect to a

geometric size is smaller.

Method according to one of claims 1 to 3, characterized in that material elevations (12) are permitted during the preforming of the workpiece (3a) to the preformed component (3b).

Method according to one of claims 1 to 4, characterized indicates that the material elevations (12) by the provision of an air gap (10) and / or a hold-down distance in the region of the material elevation (12) are allowed.

6. The method according to any one of claims 1 to 5, characterized in that the material elevations (12) are introduced selectively via the preforming tool or the preforming tools.

7 Method according to one of claims 1 to 6, characterized in that the material elevations (12) are substantially free of material thickening.

8. The method according to any one of claims 1 to 7, characterized indicates that the material elevations (12) are stretched by the stretching of the preformed component (3b).

9. The method according to any one of claims 1 to 8, characterized indicates that a region, in particular a frame region or a flange portion of the preformed component (3b) in comparison with the substantially

finished molded component (3c) is dimensioned larger in terms of a geometric size.

10. The method according to any one of claims 1 to 9, characterized indicates that the calibration of the preformed component (3b) to the finished molded component (3c) comprises an at least partially compressing the preformed component (3b).

11. The method according to any one of claims 1 to 10, characterized indicates that the preformed component (3b) is subjected by the calibration substantially in the entire component or only partially a plastic flow.

12. An apparatus for producing a shaped, in particular flange-shaped component, in particular for carrying out a method according to one of claims 1 to 11,

a preform tool (1) for preforming a workpiece (3a) into a preformed component (3b); and with a calibration tool (2) for calibrating the preformed component (3b) to a substantially finished molded component (3c),

characterized,

in that the preforming tool (1) and the calibration tool (2) are set up in such a way that the calibrating of the preformed component (3b) to the essentially finished molded component (3c) comprises an at least partial expansion of the preformed component (3b).

13. The apparatus according to claim 12, characterized in that the preforming tool (1) is adapted to allow during the preforming of the workpiece (3a) to the preformed component (3b) material elevations (12), in particular by means of a remaining in the closed state Air gap (10) and / or a Niederhalterdistanz.

14. The apparatus according to claim 12 or 13, characterized in that the

Preforming tool (1) comprises a preform punch (8) and a preform die (20) and the air gap (10) at least partially formed at least between the preform punch (8) and the preform die (6).

15. Device according to one of claims 12 to 14, characterized in that the calibration tool (2) comprises a calibration punch (20) and a calibration die (22), wherein the calibration punch (20) has a first calibration - Stamp section (20a) and a relative thereto movable second Kalibrier- stamp portion (20b), which forms the Kalibrier-stamp bottom, and / or wherein the calibration die (22) has a first Kalibrier Gesenkabschnitt (22a) and a relative thereto movable second calibration die portion (22b) forming the calibration die bottom.