WO2011113954A1 - Method and device for producing profiled rings - Google Patents

Abstract

The invention relates to a method for producing a profiled ring, in particular a metal ring, to a method for post-processing a previously profiled ring, to a shaping device for carrying out both methods, and to a working machine, in particular a pressing and/or bending machine comprising at least one such shaping device. According to the invention, said the method consists of the following steps: providing a cylindrical ring (16) that comprises a front and a rear circumferential edge (16-1, 16-2) when seen in the axial direction and a lateral surface that is formed between the axial edges; arranging the cylindrical ring (16) in a die (12) such that the ring is temporarily supported, preferably in the region of the front and the rear circumferential edge (16-1, 16-2); shaping the cylindrical ring (16) into a profiled ring (16) in a continuous manner along the circumference of the ring (16) in sections by exerting pressure in an essentially radial direction (R) by means of at least one profiling element (14), said at least one profiling element (14) and said die (12) being moved relative to each other, in particular rotated relative to each other and/or moved linearly relative to each other.

Description

 Method and device for producing profile rings

description

The present invention relates to a method for producing a profiled ring, in particular metal ring, and a method for reworking an already profiled ring, a forming device for performing the two methods and a working machine, in particular a punching and / or bending machine with at least one such forming device.

Profiled rings, in particular profiled metal rings, are used for example as sealing rings in engines or engine components, such as gaskets for turbocharger or the like.

Metallic sealing elements are known, for example, from DE 10 2004 060 845 A1. These sealing elements are annularly formed from a metallic material and have a substantially C-shaped spatial form in cross section, the cross section being open in an axial direction. The sealing element as such is annular in the broadest sense. In the radial direction of the ring, this sealing element can be elastically deformed by the c-shaped cross section a piece. Such a sealing element can be produced by deep drawing.

Another sealing element is known from DE 10 2006 045 584 A1, wherein these metallic sealing elements have a c-shaped or V-shaped profile cross-section open inward in a radial direction.

It is also mentioned that these metallic sealing elements can have a meander-shaped profile cross-section. Such sealing elements with a shaped cross-sectional profile are usually produced as follows. It is a cylindrical tube blank by means of a hydroforming process in a corresponding die in a corrugated tube with radial circumferential, annular beads formed. From this corrugated pipe section, a piece comprising one or more such annular beads is cut to length by means of conventional separation methods, for example by means of sawing or laser cutting. The resulting cut edges are not suitable as sealing edges, since usually too large trimming tolerances arise that make reliable sealing impossible only by the trimming edges themselves. For this reason, a reshaping is carried out after the cutting process, in each case in the region of the cut edges, so that a defined sealing edge, usually in the form of a kink (seen in cross-section), is generated somewhat spaced from the cut edges. Only such a sealing edge produced in the form of a kink can ensure a reliable seal in an installation situation, for example in a mounting situation in the exhaust system of an automobile. Such a production method based on a blank production in hydroforming process is complicated and expensive.

From DE 10 2009 033 135 a method for producing profiled sealing rings is known in which in a continuous rolling process first a flat strip material is deformed with respect to the cross section by means of forming rollers and also at the end of the deformation step is formed into a spiral, the spiral in about the Inner diameter / outer diameter, which should have the finished seal later. From the spiral one gear is always separated and its ends connected to each other after forming the cross section. This then creates a sealing ring extending in one plane. Here, however, increased demands are placed on the accuracy of the production. In particular, it is desirable to avoid joining an already deformed cross-section to close the sealing ring.

From EP 2 020 541 a method for producing a support ring for a sealing ring is known, in which a ring is first formed from a continuous sheet metal strip and this ring is subsequently formed by roll forming or deep drawing. This support ring is made by vulcanizing a Plastic to a dynamic sealing ring, in particular a shaft seal further developed. A bellows-type metallic sealing element and a method for producing the same are not disclosed.

From DE 197 55 391 a method for producing a sealing ring is known in which in a first step by forming a hollow cylindrical ring of a flat material, a support ring blank is made. This support ring blank is then formed by a deep drawing process. The support ring blank serves as a scaffold for overmolding with a polymer plastic to form e.g. a shaft seal. The metallic support ring of this sealing ring thus has no sealing function itself.

It is known from GB 1 369 312 to produce a sealing ring, which is c-shaped in cross-section, from a cylinder-shaped blank by means of a deep-drawing process. This sealing ring is open with its cross section in an axial direction parallel to the central axis of the blank cylinder. In such an embodiment, the deep drawing can be applied. This manufacturing method is unsuitable if it is intended to produce a sealing ring whose cross-section is or should be radially inwardly or outwardly open.

The object of the invention is to provide a method and an apparatus for producing a profiled ring in order to achieve a better quality profiled rings while saving material and lower manufacturing costs.

Another task aspect is to provide a method by which metallic bellows-like sealing elements, in particular in cross-section corrugated metallic bellows-like sealing elements can be produced in a cost effective, simple and process-safe manner.

Furthermore, as far as possible, in particular completely, a subsequent machining should be avoided. Furthermore, a method is to be specified in which conventional hydroforming for the production of the bellows-type sealing element can be completely dispensed with.

It is proposed that the method for producing a profiled ring, in particular a metal ring, according to the invention comprises the following steps:

 Providing a cylindrical ring having an axially front and a rear peripheral edge and a lateral surface formed between the axial edges,

 Arranging the cylindrical ring in a molding tool, in particular a die, in such a way that the ring is temporarily supported, preferably in the region of the front and the rear peripheral edge,

continuous section-wise forming of the cylindrical ring into a profiled ring by applying pressure in a substantially radial direction by means of at least one profiling element along the circumference of the ring, wherein the at least one profiling element and the forming tool are moved relative to each other, in particular twisted to each other or / and be moved linearly with each other.

Preferably, the cylindrical ring is brought with its axial edges before the step of forming into a profiled ring on the die in abutment, preferably in this clamped and offset together with the die in rotation about a Gesenkdrehachse. In this way, the ring to be formed can be rotated relative to the profiling element, so that the ring can be continuously formed by means of the profiling element.

The at least one profiling element can be moved in relation to the ring in the radial direction to the inner circumference, in order to press the lateral surface of the ring in the radial direction to the outside. The further advanced the forming process of the ring, the more comes the original Liche lateral surface of the cylindrical ring in profiled form in contact with the die.

In the method, it is further proposed that the at least one profiling element is designed roller-like and during the forming process performs a rotational movement about its axis of rotation offset in the radial direction and in the axial direction normally parallel roller rotation axis. Such a roller-like configuration of the profiling element and rotatability of the profiling element likewise assists the continuous shaping of the cylindrical ring to the finished profiled ring already mentioned above. The profiling of the cylindrical ring thus takes place by applying pressure in the radial direction by means of the profiling element and by rolling the die together with the ring along the profiling element. Of course, a kinematic reversal is conceivable, namely that the die is rotatably disposed with received cylindrical ring and the profiling element along the inner circumference of the ring to be formed performs a circular movement.

The rotational movement of the profiling element is preferably a passive rotary movement transmitted by the rotation of the die and the ring, in particular by friction, and / or an active rotary movement generated by a roller drive. In the case of an active rotational movement, it is also conceivable that the profiling element is actively driven only at the beginning of a forming operation in order to bring the profiling element in accordance with a rotational speed of the die and the ring to a substantially same rotational speed.

The profiling element will preferably exert pressure in the radial direction on the ring until the deformation of the cylindrical ring to the profiled ring has been completed. In the case of a roller-like profiling element, the ring will make at least one complete 360 ° turn around the die axis of rotation so that it will fully profile is. It is also conceivable that the profiling element first performs a pre-profiling of the ring with a lower pressure during a first complete revolution of the ring and then the pressure in the radial direction is increased, ie the profiling element is displaced linearly in the direction of the ring relative to the die Completely reshape the ring during a second or further complete revolution. The choice of the number of revolutions of the ring during the forming process to the complete profiling of the ring can be chosen arbitrarily according to the Profilierungskomplexität or the material used, in particular the material thickness.

If more than one profiling element should be used, the number of revolutions depending on the arrangement of the profiling elements can be reduced if necessary. If, for example, three profiling elements are provided which are distributed regularly along the circumference of the ring, a complete profiling of the ring may possibly already have taken place after rotation about a third of a circle, that is about 120 °. In the case of a kinematic reversal (fixed ring), the profiling element rolls along the circumference of the ring until it has followed the entire circumference at least once.

After completion of the profiling of the ring, the ring can be removed from the die. In this case, preferably after completion of the profiling of the ring, the profiling element is moved in the radial direction away from the ring to release it.

During the forming process, therefore, the ring to be reshaped is received in sections and continuously between the profiling element and the die and, according to the shaping of the profiling element or the die, the lateral surface of the cylindrical ring is brought into the desired profile shape. As long as the profiling element rests against the ring, this is clamped between profiling element and die. This clamping effect can then be seen after completing the Profiling be solved by moving away the profiling element in particular in the radial direction of the ring. The finished profiled ring can then be removed in particular by opening the die out of this.

If already profiled rings are present, which may have been produced by another method, but have not been sufficiently worked with regard to their precision, according to a further aspect, a method for reworking an already profiled ring, in particular metal ring, is proposed which comprises the following steps :

Providing the profiled ring,

Placing the cylindrical ring in a die,

along the circumference of the ring continuous sectional forming of the reworked ring to a finished profiled ring by exerting pressure in a substantially radial direction by means of at least one profiling element, wherein the at least one profiling element and the die are moved relative to each other, in particular twisted to each other and / or be moved linearly to each other.

Such a post-processing method allows a simple quality improvement in already produced profiled rings. Of course, the die and the profiling element of the profile shape of the already profiled ring should substantially correspond.

Furthermore, the invention also relates to a forming apparatus for carrying out a manufacturing method or a post-processing method described above, wherein the forming apparatus comprises:

a die in which a ring to be formed is receivable,

at least one profiling element, wherein the at least one profiling element and the die are arranged so that they are movable relative to each other, in particular rotatable to each other and / or linearly movable, wherein the at least one profiling element is formed such that in the radial direction relative to the in the die recorded ring is partially exerted pressure on the die and the cylindrical ring received therein in order to transform the cylindrical ring into a profiled ring.

Preferably, the die is rotatable about a Gesenkdrehachse.

The at least one profiling element is preferably of a roller-like design and is movable with its outer circumferential surface toward a corresponding mold section of the die, preferably in such a way that during the forming of the cylindrical ring into the profiled ring, the outer peripheral surface and the mold section at least partially interlock. Of course, this intermeshing takes place with the interposition of the ring to be profiled or profiled so that there is no direct contact between the profiling element and the die per se.

The at least one profiling element is preferably rotatably mounted about a roller axis. As a result, the rolling of the profiling element along the ring circumference (inner circumference of the ring), which is addressed in the method, can be made possible with the die or ring rotating.

Preferably, the forming device comprises a die drive device which rotates the die about the die axis of rotation.

Further, a Profilierungsantriebseinrichtung be provided, which moves the at least one profiling element relative to the Gesenkdrehachse in the radial direction relative to the die linear.

The profiling drive device can set the at least one profiling element at least temporarily during the forming process in rotation about the roller axis.

Finally, the invention also relates to a working machine, in particular a punching and / or bending machine with at least one punching and / or bending machine. connected forming device for performing the mentioned method steps.

The object of the invention in a further aspect is to provide a precisely manufactured bellows-type sealing element which can be produced precisely, in particular without machining, and which also has an increased length compensation capability in an axial direction. Furthermore, a metallic sealing element is to be specified, which in a simple manner in terms of its spring rate in the axial direction is constructively adaptable to a variety of boundary conditions.

Furthermore, a metallic, bellows-type sealing element is to be specified, which retains its resilient bias better over the lifetime, in particular in high-temperature applications, for example in the exhaust system of a motor vehicle or other hot temperature applications, than already known metallic sealing elements.

Such a sealing element is to be prepared by the method explained above. In a slightly modified formulation, the preparation process can also be described as follows:

An inventive method for producing a metallic, in particular bellows-type sealing element has at least the following steps: a) providing a tubular blank as a ring of metal;

 b) arranging the blank within at least one of a cross-sectional contour of a sealing element as a form relief having mold, in particular die, wherein as a profiling element a roller die, which preferably has a counter-relief corresponding to the relief, is disposed within the blank, wherein for shaping

an application of a contact force F directed radially outward with respect to the blank takes place, which presses the roller punch gene an inner side of the blank presses and - a rolling of the inner punch during the application of the contact force F takes place on the inside of the blank, wherein the blank circumferentially the cross-sectional contour of the mold relief is acceptably plastically deformed.

Thus, the shaping of the bellows-type sealing element takes place in that the blank is formed rolling while applying or maintaining a contact force F in the radial direction between the roller punch and the forming tool. The pressing force F, which is generated on an inner side of the blank by advancing the roller punch radially outward on the mold, is expediently increased radially with increasing delivery of the roller punch to the outside, but at least kept the same. This means that with increasing deformation of the blank in the form of relief by adjusting the roller punch radially outward on the mold to the contact force F should be maintained or even increased.

According to a preferred embodiment, the method further comprises the step that the mold is actively set in rotation by means of a drive and the roller punch is actively set in rotation by means of another drive, such that the roller stamp comes into contact with the blank in a slip-free or nearly slip-free manner wherein the active drive of the roller punch is turned off when the roller punch is in frictional contact with the blank and the roller punch is rotationally driven during the shaping by friction from the blank.

In one development of the invention, the roller punch and / or the mold are actively set in rotation around its respective central axis and the roller punch and the mold are actively approached in the radial direction. In a further advantageous embodiment of the invention, the sealing element after shaping in the mold in its axial direction can be slightly compressed. As a result, undercuts can be produced in particular in the longitudinal section, which would not be able to be produced alone in the mold together with the roller punch. In particular, wall areas that depart from arcuate sections can taper towards one another.

In a further advantageous embodiment of the method according to the invention, the sealing element can be deformed into an oval, preferably compressed, which causes a particular clamping for mounting on cylindrical components and thus represents a captive or easier assembly.

The method according to the invention can advantageously be used as a preforming step, then as a finishing step and, if appropriate, as a calibration step, if appropriate in different molding tools. As a result, the sealing element can be produced in a simple multi-stage manner with one and the same basic method II. In contrast, in the prior art, the conventional hydroforming process, optionally a separation process and another Nachformverfahren, e.g. a reshaping be applied.

In a particular embodiment, successive or adjacent arc sections of the sealing element can be manufactured by means of the roller die individually and in succession. This is particularly useful when grooves and arc segments of a sealing element have a certain minimum axial distance from each other. Thus, for example, a sealing element can be formed, which has a curved section adjacent to a sealing edge, then extends in a cylindrical cylinder-like manner and, in turn, has an arc section in the region of the second sealing edge. Of course, it is also possible in a particular embodiment of the method according to the invention, by means of a Mehrfachrollen- Stamp simultaneously form several arc sections, in particular up to four arc sections of the sealing element.

As a blank, in the context of the invention quite generally, in particular a tube section produced from a sheet-metal strip can be used with an interface, wherein the tube section is preferably welded or soldered at the interface. However, a seamless tube can also be used, with the first variant in particular being more cost-effective, in particular in applications in vehicle construction.

In a particular embodiment of the method according to the invention, the mold is designed as a non-divisible, but optionally as a disassemblable mold whose smallest free inner diameter D, is greater than the final outer diameter D _{2 of} the blank or a present in an intermediate molding step blank or the sealing element, so that in each case the formed part can be removed from the mold.

In this tool design, the sealing element or the blank is arranged eccentrically in the mold during the shaping step and is in contact only with a relief form, which is formed for example from a relief web of the mold and a counter-relief of the roller punch.

In particular, it has been proven that the free inner diameter of the mold is about 1% to 40%, preferably 2% to 20%, ideally 3% to 10% larger than the outer diameter Di of the sealing element.

In a comparable manner, this also applies to the roller die, wherein the roller punch preferably has a largest outer diameter D _a , which is smaller than the smallest inner diameter of the molded sealing element or the blank or the blank in an intermediate molding stage, so that after the forming step of the blank or the sealing element of Roller stamp can be removed. In a preferred manner, the outer diameter D _{a of} the roller punch is 1% to 40%, preferably 2% to 20%, ideally 3% to 10% smaller than the smallest free inner diameter Di of the molded sealing element.

According to a further advantageous embodiment, the blank is formed before shaping by means of a bottom piece and possibly also by means of a cover plate, which e.g. Part of the mold may be positioned and / or held in an axial direction relative to the mold relief.

In a particular embodiment of the method, the blank may be fixed through the bottom piece and the top plate during the forming step, wherein advantageously the bottom piece and / or the top plate during the forming step in the axial direction adapted to the decreasing axial height h of the blank during deformation be delivered.

In a further preferred embodiment, an axial compressive force is applied to the blank or the sealing element located in a deforming step during the forming step to assist the flow of the blank material and the nesting of the blank to the mold relief.

Furthermore, the invention relates to a bellows-type sealing element which can be produced or produced by the method according to the invention.

In a preferred embodiment of the invention, the sealing element at least in an edge region in cross-section on a kink, wherein the kink forms a sealing edge in the intended use of the sealing element.

In a further particular embodiment of the invention, the sealing element is conically tapering or widening in its axial direction. educated.

A further advantageous embodiment of the sealing element according to the invention is that free edges of the sealing element at one end of the sealing element point radially inward to the central axis of the sealing element.

In a special way, it is advantageous that the sealing element according to the invention is formed bellows-like, so that it is resilient in the axial direction and thus has a self-bias and a length-adaptability in the installed state.

In particular, in hot gas applications, a bellows-like configuration of the resilient sealing element is of particular advantage, since the stresses in several arcuate portions of such a resiliently biased sealing element is less than in a cross-sectionally C-shaped sealing element, so that at high temperatures flowing of the material in the sealing element according to the invention only takes place later. Thus, the sealing elements according to the invention in the high temperature range can be used particularly advantageously.

As materials for the sealing element according to the invention, in particular steel, in particular stainless steel or high-alloy nickel alloys or nickel-cobalt alloys, z. As Inconel, and spring steel proven.

Further advantageous materials are mentioned in the following description.

For a typical use in vehicle construction, especially in the hot gas area, e.g. In the exhaust system of a motor vehicle or commercial vehicle sealing elements have proven with wall thicknesses in the range between 0.1 mm and 0.3 mm.

In a particularly preferred manner, radii R _t R ₂ , R _{3 of} the soil gene sections of the bellows-like sealing element be different sizes. This opens in particular a great deal of design freedom in the design and adaptation of a sealing element to constructive boundary conditions.

The invention will now be described by way of example and not by way of limitation with reference to the accompanying drawings.

Fig. 1 shows in the partial figures a) to c) purely schematically and in one

 Art Schematic diagram Steps of the method for producing a profiled ring in a kind of front view on a die and an associated profiling element.

2 and 3 show in the illustrations 2a) to c) and 3a) and b) purely schematically and in a schematic representation of the manufacturing method according to the invention in an enlarged and simplified sectional view of the die, umzuformendem ring and profiling element.

4 shows a schematic sectional view of an example of a two-part die with a profiling element for carrying out the method.

Fig. 5 shows another embodiment of a die with profiling element as a partial view in a sectional view of a larger work machine.

Fig. 6 shows schematically enlarged in longitudinal section (line A-A of Figure 7a) a metallic, bellows-type sealing element according to the invention.

7a, 7b, 7c show a plan view, a side view and an isometric view of a metallic bellows according to the invention gene sealing element.

Fig. 8 shows a longitudinal sectional view (line A'-A 'of Figure 7) of the metallic bellows-like sealing element according to the invention.

Fig. 9 shows schematically a blank for an inventive

 Sealing element.

10 shows a cross section through a production tool (preforming step) for producing a sealing element according to the invention.

FIG. 10 a shows a detailed detail from FIG. 10 (detail X).

Fig. 1 1 shows a cross section through a second production tool for

 Production of the metallic sealing element according to the invention (postforming step);

Fig. 1 a shows the detail X of Fig. 1 1 and

Fig. 12 shows schematically the sequence of the manufacturing method according to the invention.

Fig. 1 shows in part a) schematically and greatly simplified a forming device 10 for carrying out a method for producing profile rings. The forming device 10 comprises a die 12, which is preferably ring-like or ring-like, and a profiling element 14. The die 12 and the profiling element 14 are movable relative to one another, in particular rotatable relative to one another and / or relative to a die axis GA relative to the radial direction mutually displaceable. The profiling element 14 is preferably designed like a roller and is also referred to below as profiling roller. In the radial direction, in FIG. 1 a) between the die 12 and the profiling roller, a metal ring 16 to be reshaped, in particular a metallic ring 16, is shown schematically. The ring 16 is shown here concentrically to the die 2 for purposes of explanation of the manufacturing process. However, it is not absolutely necessary that the ring 16 to be reshaped is always arranged exactly concentric with the die or profiling roller 14 at the beginning of a forming process. It is also conceivable that the ring 16 rests with its outer circumference, for example due to gravity on a lower peripheral portion of the die 12.

Fig. 1 b) shows the state of the forming device during forming of the ring 16 to the profiled ring. As can be seen from this illustration, the profiling element 14 and the die 12 were displaced in the radial direction R relative to each other. This relative movement can also be achieved in that only the profiling element 14 or only the die 12 is displaced together with the ring 16 in the radial direction R. In the present example, it is indicated that the profiling roller 14 is moved towards an upper inner peripheral portion of the die 12. Of course, the profiling roller 14 can be moved in any radial direction starting from the Gesenkachse GA, ie also down or to the left or right with respect to the present representation.

In order to be able to deform the ring 16 continuously and in sections in the circumferential direction, the outer periphery of the profiling roller 14 is pressed in the radial direction against an inner peripheral portion of the die 12 so that the ring 16 is clamped between the profiling roller 14 and the die and according to the die shape is transformed. During this forming operation, the die 12, the ring 16 and the profiling roll 14 rotate relative to each other. It is preferred if the die 12 is driven with the ring 16 received therein by a corresponding, not shown here drive device for the die. The profiling roller 14 is preferably rotatable around stored a roller axis RA, so that it can be rotated in the state shown in FIG. 1 b) passively due to the frictional forces acting. Alternatively, it is also conceivable that the profiling roller 14 has its own drive which at least temporarily supports the rolling movement of the profiling roller 14 along the inner periphery of the die 12. The continuous mutual unwinding of die 12, ring 16 and profiling roll 14 together causes the ring 16 to be continuously reshaped. Due to the clockwise direction of rotation (arrow DR) shown in FIG. 1 b), a shaped profile ring section 16 a is already visible. The rotational movement of the die 12 takes place at least until the entire ring 16 has been completely reshaped, that is to say the die or the ring has performed at least one complete revolution through 360 ° or possibly a little more. Optionally, the die 12 and also the ring 16 may make several turns until the profiled ring is completely made. It is particularly conceivable that during a first revolution, the profiling roller 14 acts with a still slightly lower pressure in the radial direction of the ring and is further increased in a subsequent rotation of the pressure. Preferably, however, the deformation of the ring 16 to the finished profile ring takes place by a complete revolution.

FIG. 1 c) shows the state of the shaping device after completion of the profiling process, in which case the entire ring 16 has now been reshaped, that is, it is now present as a profiled ring in the die 12. The profiling roller 14 has been moved away from the inner periphery of the die 12 in the radial direction, so that the profile ring 16 is released again and can be removed from the die 12. The profiled ring 16 is shown in Fig. 1 c) slightly thicker, since it has a larger, visible in the axial direction peripheral surface due to the profiling.

2 and 3 show greatly simplified and schematically sectional views corresponding to the section lines II-II and III-III of Fig. 1, wherein Fig. 2a) substantially corresponds to Fig. 1 a), Fig. 2c) is substantially the Fig. 1 b) and Fig. 3b) substantially of Fig. 1 c). The in Figs. 2b) and 3a) Sectional views represent intermediate steps of the method, which are not apparent in FIG.

Fig. 2a) shows a sectional view of the cylindrical ring 16 which is received in particular with a front and rear peripheral edge 16-1 and 16-2 in the die 12, in particular clamped in this. The profiling roller 14 is still arranged at a distance from the die 12, so that the ring 16 between profiling roller 14 and die 12 could be received in the forming device.

Fig. 2b) shows the relative displacement of Profilierungsrolle 14 and die 12 to each other in the radial direction R (see arrow in Fig. 2a)). In this case, the profiling roller 14 is preferably moved in the radial direction to the die 12. In this case, the ring 16 touches with its lateral surface 16-3 Abstützradienabschnitte 18 of the die 12. The ring 16 is thus tilted under the action of the profiling roller 14 to these support radii 18 in a certain way and pressed in the radial direction in the die 12. The forming of the ring takes place, as already explained with reference to FIG. 1, by turning the die together with the ring 16, so that the ring 16 is shaped in sections and continuously along its circumference.

Fig. 2c) shows the state in which the profile ring 16 is converted the most when the profiling roller 14 is fully inserted into the die 12. Depending on the configuration of the die mold and the associated profiling roller 14, a wide variety of shapes of profile rings can be produced. The here in cross-section approximately V-shaped ring shape may also be arcuate or U-shaped, possibly also almost rectangular or the like. Run. With reference to the ring, in the present example it is shaped convexly with respect to its radial direction. By appropriate shaping of the die and the profiling role, however, it is also conceivable that a concave configuration with respect to the radial direction is selected. When unrolling the die 12, the ring 16 and the profiling roller 14 to each other in the profile ring 16 and an edge portion 16-4 is formed. This edge portion 16-4 can be smoothed by changing the shape of the profiling roller 14 and the die 12 to the desired extent. The overall dimensioning of the ring takes place in the end position of the profiling roller 14 shown in FIG. 2c. In particular, a kind of finish takes place in this position due to the compressive force of the profiling roller 14 on the profiled ring 16 for the die 12. This pressure force acts for the most part in the radial direction. After the profiling process according to FIG. 2 c) has been carried out for the entire ring, ie the ring 16 has undergone at least one complete revolution in this relative position of profiling roller 14 and die 12, the profiling roller 14 can, as shown in FIG. 3 a), in the radial direction R are moved away from the die 12 again. By this movement, the clamping of the ring 16 between profiling roller 14 and die 12 is released, so that the profiled ring 16, as shown in Fig. 3b) can be removed from the die. The removal of the profiled ring 6 is preferably carried out automatically.

4 shows by way of example a die 112 which comprises a first die ring 1 2a and a second die ring 1 12b. The two die rings 1 12a, 1 12b can preferably be screwed together to form a complete die 1 12. From the sectional view of FIG. 4, the Gesenkachse GA can be seen, which has already been explained with reference to FIG. 1. Also shown is a profiling roller 1 14, which is inserted into the die 112 in the axial direction. The profiling roller 1 14 is in the radial direction R relative to the die 1 12 movable to reshape a received in the die 1 12, not shown here ring according to the presented method according to FIGS. 1 to 3. From FIG. 4, a length of the feed surface 120 and a so-called. Gesenkbreite GB are also visible. This catchment surface length 120 and the die width GB can be selected according to the forming result to be achieved. The length of the feed surface 120 has a particular effect. kung on the smoothing of the edge portion 16-4 of the profiled ring.

FIG. 5 shows, in a sectional illustration similar to FIG. 3, a forming device 210 which is attached to further components of a working machine, not described in more detail, with such a shaping device. A profiled roller 212 and the profiling roller 214 can be seen here. The profiling roller 214 is connected to a type of shaft 222 by means of screw connections 226. The die 212 is closed in the axial direction by front and rear limiting members 228 and 230, respectively. In the intermediate space ZR formed by the components 228 and 230, the ring, which is not shown here, can be accommodated and then formed by means of radial adjustment of the profiling roller 214 to the die 212. The radial displacement required for reshaping takes place in this exemplary embodiment with respect to the selected representation upward in accordance with the arrow R.

The die 212 is connected to a shaft 232, which is itself connected to a drive, not shown, so that the die 212 can be rotated in rotation about the Gesenkachse GA.

Whether the die is designed in one or more parts, plays a minor role in the implementation of the manufacturing process. It is essential that the die and the profiling role are designed such that they can be rolled relative to each other with the interposition of the ring to be formed to each other. By this rolling movement, the sections and continuous deformation of the ring to the profile ring.

In the following, an embodiment of the invention will be explained with regard to the production of a bellows-type sealing element with reference to FIGS. 6 to 12.

A metallic sealing element 1 according to the invention (FIGS. 6, 7a to 7c) has a substantially annular spatial form and is in longitudinal section bellows corrugated in the manner of a corrugated pipe with circumferential bead-like elevations 1 a and groove-like recesses b formed. Under "bellows" in the context of the invention, a structure with elevations 1 a and 1 b wells to understand, which is elastically deformable in an axial direction 100 resiliently. This is characteristically achieved in that at least some wall regions of the bellows are arranged at an angle Φ 180 ° to the axial direction 100.

The bead-like elevations 1 a point in a radial direction 101 to the outside, away from a central axis M. Between two bead-like elevations 1 a, a groove-like recess 1 b is arranged. The elevations 1 a have on the outside with respect to the sealing element 1 a zenith Z. On the inside have the groove-like depressions 1 b a zenith Z '.

The metallic sealing element has a first free edge 2 and a second free edge 3. Adjacent to the free edges 2, 3, 2 sealing edges (first sealing edge 4 and second sealing edge 5) are arranged. In the further course of the cross section follows on the sealing edge 4, first, a first arc section 6. Following this, the metallic sealing element 1 has a counter-curved second arc section 7. Between the second arc section 7 of the second sealing edge 5 sits a third arc section eighth

For the further description, an inner side 1 1 and an outer side 12 of the sealing element 1 is defined.

Both between the arc sections 6, 7, 8 and between the first arc section 6 and the sealing edge 4 as well as between the third arc section 8 and the second sealing edge 5 may optionally be present in cross section straight sections. However, the arc sections 6, 7, 8 can also merge directly into each other or run directly into the sealing edges 4, 5.

The metallic sealing element has a height h and an outer diameter. knife D ₂ and a free inner diameter D _L

Furthermore, the metallic sealing element has a central axis M.

In the illustrated embodiment according to FIG. 6, the free edges 2, 3 are aligned in the axial direction 100 approximately at the zenith Z '.

Of course, it is also possible that, for example, free edges 2 'or 3' are formed, which end with respect to the zenith Z 'radially closer to the central axis M. In this case, such free edges 2 ', 3' have a different distance from the central axis M. Such a configuration of the sealing element 1 can be readily realized with the method according to the invention, whereas a production method based on a corrugated tube blank which is internally high-pressure-deformed does not permit such a design of the sealing element or only under extremely cumbersome conditions. In such a method according to the prior art, one relies on the preformed spatial form of the corrugated pipe blank.

The above information essentially applies to circular metallic sealing elements. Of course, deviating forms of space, for example, ovalized metallic sealing elements 1 are to be settled within the scope of the invention.

Such above-described sealing elements 1 are considered in the context of the invention as bellows-like sealing elements, since they are formed in an axial direction 100 (parallel to the center axis M) resiliently wavy longitudinal section, so that an axial length compensation between two adjacent sealing partners, between which the sealing element 1 is arranged is possible.

Such a bellows-type sealing element can not be produced, for example, by deep-drawing with linearly movable mold halves. With thermoforming methods, only corrugated sealing rings can be produced, whose wavy course runs in the radial direction 101 and not in the axial direction 100 as in the bellows-type sealing element according to the invention.

To ensure a perfect sealing function, high demands are placed on the geometric dimensions of the metallic sealing elements. For example, the dimension h (height of the metallic sealing element) between the sealing edges 4, 5 measured to tolerate circumferentially around the metallic sealing element only in the tenth range. For example, a tolerance of +/- 0.2 mm has proven itself with a height h of 8 mm. These requirements can be easily realized with a sealing element according to the invention, produced by a method according to the invention, with manageable effort.

As radii Ri, R ₂ , R _{3 of} the arc sections 6, 7, 8 have radii of a few millimeters, in particular in the range of 2 mm to 5 mm proven. The radii Ri, R ₂ , R ₃ can each be chosen to be the same size or different sizes. As a free opening angle a, which is preferably the same for all arc sections 6, 7, 8, an angle of 45 ° <α <65 °, in particular of 50 ° <α <60 ° has proven. The details refer to the dimensions of the metallic sealing element in the non-installed, so not strained state. In particular, it may also be expedient, for example, to select the free opening angles of the first arc section 6 and of the third arc section 8 to be the same and optionally to select the free opening angle α of the second arc section 7 differently therefrom. In most cases, a symmetrical in cross section training has proven. However, the invention is not limited to this embodiment. Furthermore, it is within the scope of the invention to produce the sealing element with arc sections 6, 7, 8 described above as well.

The arcuate sections 6, 7, 8 are open inwardly or outwardly in the radial direction 101 of the metallic sealing element 1, so that the free edges 2, 3 are also preferably each in the radial direction 101, in any case substantially. chen in the radial direction 101 point. To install a metallic sealing element 1 according to the invention between two parts to be sealed 10a, 10b (first part 10a, part 10b, shown in highly schematic form in FIG. 7b), the metallic sealing element 1 is joined by joining or joining the parts 10a, 10b to be sealed with respect to its longitudinal section in the axial direction 100 pressed. As a result, the arc sections 6, 7, 8 are resiliently compressed. The first sealing edge 4 and the second sealing edge 5 thus become the axially outermost edge of the sealing element 1, so that only the sealing edges 4, 5 rest against the first part 10a or the second part 10b and thus a defined line seal is ensured.

Preferred materials for forming the metallic sealing element 1 according to the invention are "AR Gasket", "B096", in particular all high-temperature-resistant stainless steels and spring steels. B096 is to be understood as meaning high-alloyed nickel steels. A particularly preferred material for the metallic sealing element is a NiCr19Fe19Nb5Mo3 steel (material no.

2.4668) according to DIN 59746.

As a material thickness for conventional applications, especially for example in hot gas lines in the automotive and commercial vehicle, a material strength s in the range between 0.1 mm and 0.25 mm, especially in the range between 0.1 mm and 0.2 mm has proven.

FIG. 8 shows a longitudinal sectional illustration along the line A'-A 'from FIG. 7 of the metallic bellows-type sealing element according to the invention. In this embodiment, it is particularly clear that between the elbow pieces 6, 7, 8 respectively flat or nearly flat portions of the sealing element 1 are present, which are shown in the drawn longitudinal section as straight or almost straight Längsschnittverläufe.

In particular, care can be taken in the production of the sealing element 1 according to the invention with the production method described below be worn in the sheet sections 6, 7, 8 in the deformation of a blank 200 (see Figure 4) is a thinner material thickness s' than the starting material thickness s on the finished sealing element 1 is present. As a result, in particular the resilient properties of the sealing element 1, in particular in the axial direction 100, can be influenced in a targeted manner. It is also possible, in particular in the area of the arc sections 6, 7, 8, to apply an increased pressing pressure in the production method described below, and thus to achieve solidification of the material, in particular strain hardening of the material. In particular, stresses can thereby be registered specifically in the sealing element, in particular in the arc regions 6, 7, 8, and thus the resilient properties are selectively influenced.

The method of manufacture II will be explained in more detail below by way of example with reference to FIGS. 9 to 12, the production method being described in particular with reference to drawings concerning the production tool (s) according to FIGS. 10 to 11.

Starting point for the production of a sealing element 1 according to the invention is a strip-shaped blank 200, the length P and the width h '. This strip-shaped blank 200 is formed around an axis parallel to a narrow side edge 201, for example, the central axis M to form a cylindrical ring and welded or soldered along the narrow side edges 201, so that a cylindrical tube blank 200 is present.

The terms "axial direction 300" and "radial direction 301" used below refer to a radial direction and axial direction of the production tool for the following description and may correspond to the radial direction 101 of the sealing element 1 and to the axial direction 100 of the sealing element 1, as in the previous Description used to coincide, but do not have to.

Furthermore, the following terms such as "top", "bottom", "top" and "underside" used. These terms refer to the location of the representations in the figures. Of course, in reality, the overall arrangement or individual arrangements with respect to a vertically upper and a vertically lower layer may also be reversed.

1. Both the forming tool 210 and the roller punch 21 1 are mounted for rotation about a central axis MW of the production tool independently of one another or coupled to one another in a double-arrow direction 212. The mold 210 is formed, for example, in the manner of a hood-like die having a downwardly open die opening 213. The molding tool is formed, for example, from a cover plate 214, a relief plate 215 and a holding plate 216. The holding plate 216 and the relief plate 215 have a hole-like recess, which form the die opening 213 together with a blind hole-like recess of the cover plate 214. The relief plate 215 has a relief web 217 which projects radially inwards into the die opening 213. The die opening 213 has a minimum free inner diameter D "which is greater than an outer diameter D _{2 of} the annular blank 200 and further selected at least so large that the maximum inner diameter D, is greater than the largest outer diameter of each forming step of the blank 200, in particular 1% to 40%, preferably 2% to 20%, ideally 3% to 30% larger.

On the underside, the molding tool 210 has a bottom piece 218. The bottom piece 218 essentially closes the die opening 213 downwards and has a slot recess 219 which is penetrated by the roll punch 21 1. The roller punch 211 has a stub shaft 220 for connection to a drive device (not shown). Within the die opening 213, the roller punch 21 1 expands radially outward in a mushroom-like manner and has a counter-relief 221 which corresponds to the relief plate 215 or to the relief bar 217. The roller punch 21 1 is movable with respect to the mold. zeugs 210 in a radial direction 301 within the elongated hole 219 slidably. Both the mold 210 and the roller punch 2 1 are independently drivable or coupled to each other. The relief ridge 217 and the counter-relief 221 form a relief 217, 221 for shaping the sealing ring.

In order to carry out a preforming step according to the method according to the invention, a blank 200 is arranged resting on the bottom piece 218 in the die opening 213, so that the blank 200 preferably has play for the relief bar 217 and also has clearance for the roller punch 21 or counter-relief 221.

The position of the blank 200 in the axial direction 300 relative to the relief web 217 can be predetermined and adjusted by means of the bottom piece 218, which is optionally axially displaceable, in particular drivable axially displaceable in the axial direction 300.

Now, the mold 210 is rotated in the double arrow 212 in rotation. The roller punch 21 1 is also set about its central axis in rotation and radially offset in the radial direction 301 preferably motor relative to the mold 210 for the purpose of applying a contact force F radially. This takes place until the blank 200 is clamped between the relief web 217 and the counter-relief 221 and thus the blank 200, which was initially still resting on the bottom piece 2 8, rotated together with the roller punch 2 1 and the mold 210 in rotation becomes. Along the radial direction 301, the roller punch 21 1 is subjected to a force (pressing force F), so that the blank 200, which is eccentric with respect to the central axis MW in the mold 210 at this time of the method and only by means of a portion of the mold relief 217, 221 is in contact, is formed. The blank 200 is thus located during the preforming step in the circumferential direction only partially partially eccentrically offset on the mold 210 inside, in particular on the relief web 217 and the roller punch 21 1 at. Only in Contact area between the roller punch 211 and the blank 200 and the mold 210 takes place under the contact force F, a plastic deformation in which with increasing radial offset and optionally pressing force F of the roller punch 21 1 along the radial direction 301 of the blank 200 plastically deformed around the relief web 217 becomes. As a result, for example, a second arc section 7 (see Figures 1 to 3) of the above-described sealing element according to the invention 1. The mold 210 and the roller punch 21 1, but at least one of these two form partners, is driven so long and the contact force F of the roller punch 211 respect. of the mold 210 so long maintained or increased until the blank 200 has nestled in the contact area with the mold 210 and the roller punch 21 1 completely to the relief web 217 and thus the preforming step is completed.

Subsequently, the roller punch 21 1 is moved back in the radial direction to the center of the molding tool 210 (to the starting position). The preformed blank can thus be removed from the relief web 217 and is now removably in the die opening 213. For removal, for example, the roller punch 211 can be moved together with the bottom piece 218 in the axial direction 300 down so that the preformed blank 200 are taken from the bottom piece 218 can. This is possible, since the diameter D, of the molding tool 210 in any case is greater than the outer diameter D _{2 of} the now preformed blank 200. In this way, the closed, annular blank from the die opening 213 remains removable.

An inventive advantageous feature of the method and the production tool is that the mold 210 is formed as a non-divisible tool, ie it must not consist of two mold halves during the manufacturing process of a sealing ring 1, so that the tool can be opened and closed. Rather, it is sufficient to make the mold 210 not divisible and the removability of the workpiece (blank or preformed / endgeformter blank) on the Di diameter choice, which must be sufficiently large, to ensure.

Under a non-divisible tool is a tool to understand, which is not divisible during operation. Of course, the above-described molding tool 210, which consists in exemplary description of the cover plate 214, the relief plate 215 and the support plate 216, as such can be dismantled, for example, for maintenance or for the purpose of replacing the relief plate. However, a dismountable tool is not a divisible tool in the sense of the above description. In the illustrated position according to FIG. 10a, the fully assembled molding tool 210 is a hood-like tool block firmly screwed together and not divisible during operation, with a die opening 213 open at the bottom.

FIG. 10a again shows what has been described above in an enlarged view on the basis of the detail X from FIG. 10.

In the representation according to FIGS. 10, 10a, the roller punch 2 for radial infeed relative to the forming tool 210 can be moved to the right starting from the position shown in FIG.

In the following, the forming tool is illustrated by means of a finished molding step, wherein the radial displaceability of the roller punch 21 1 relative to the mold 210 in the illustration according to FIGS. 11, 11a is perpendicular to the plane of the drawing. In addition to the illustration according to FIGS. 10, 10a (not shown there), in the illustration according to FIG. 11, the molding tool 210 is connected to a drive shaft stub 250, which is rotationally drivable. The roller punch 21 1 is seated in a sliding link 251, wherein the sliding link 251 has grooves 252 which are slidably mounted on sliding webs 253. The sliding webs 253 are part of a tool base 254, wherein the tool base 254 is bolted to the bottom piece 218. Thus, the roller punch 21 1 is slidable together with the bottom piece 218 in the axial direction 300, whereas the Roller temple 21 1 relative to the tool base 254 is linearly movable and in particular with respect to the mold 210 is radially displaceable.

In contrast to the above-described preforming step, the molding tool 210 differs only in that the cover plate 214, the relief plate 215 and the retaining plate 216 are designed differently in the region of the contour pointing toward the die opening 213 in relation to the preforming step. Thus, e.g. the lid plate 214 and the relief plate 215 as well as the relief plate 215 and the holding plate 216 each have a relief form 280 for forming a first curved section 6 and a third curved section 8.

FIG. 11a shows, on the basis of the detail X according to FIG. The process of loading the blank 200, forming the blank 200 and removing the blank 200 corresponds to that described in connection with the preforming step with reference to FIGS. 10 and 10a. The molding tool 210 in the final molding step according to FIGS. 11 and 11a is designed as a dome-like tool (having the die opening 213, but not divisible but dismountable) during operation.

The finished molding of the sealing element 1 is carried out in the same or analogous manner to the preforming step by radially displacing the roller punch 21 1, applying a contact pressure F and shaping the blank 200 in the form of relief 280.

After the blank 200 has completed the finish-forming step in the tool according to FIGS. 11, 11a, a calibration step may be added, if necessary, in which the sealing edges 4, 5 are produced in the required tolerance. For this purpose, a step which is substantially identical to the preforming step and the finish-forming step according to FIGS. 10, 10a and 11, 11a offers itself. During the calibration step, only the degree of deformation of the ready-formed blank 200, which is then already inserted in the calibration tool, is clearly minimized and relates only to the production and shaping the sealing edges 4 and 5 within the tolerance range. Further transformations are preferably not carried out in the calibration step.

Subsequent to the calibration step, the sealing element 1, which is now ready-made, may if desired be compressed in the axial direction 100 of the sealing element 1, in order optionally to reach the predetermined height h of the sealing element within the predetermined tolerances.

Optionally, it can also be used to facilitate assembly of the sealing element 1, to compress the sealing element 1 following the manufacturing process in the radial direction, so that an oval sealing element 1 is formed.

Finally, with reference to FIG. 12, the essential steps of a preferred embodiment of the method according to the invention for the production of particularly bellows-type sealing elements are shown.

The first step is the production of the blank, wherein in particular a welding or soldering of a ring from a band-shaped sheet metal is preferred. Subsequently, as part of a preforming step, a first profile section, for example an arc section 7 of the sealing element 1, is formed.

In a second molding step (finished molding step), further arc segments of the sealing element 1 are formed, for example the arc segments 6 and 8.

As part of a recalibration step, if necessary, the exact geometric tolerance of the sealing edges 4 and 5 can be adjusted.

In the case of readily deformable materials or, in particular, also in the case of simple cross-sectional geometries, the preforming step may optionally be omitted and the shaping process carried out by means of a shaping step before the calibration. If necessary, even the calibration step can be omitted. len.

The inventive method is characterized in particular by a high-precision production of sealing elements in bellows-type design. In particular, it is also easily possible to produce a succession of several arc sections, also a sequence of more than three arc sections, and thus to create a sealing, resilient sealing device. A forming step for the production of the blank by way of hydroforming process deleted. Furthermore, machining of the free edges 2 and 3 can be omitted.

Experiments have shown that blanks with a height h 'of at least 5 mm are already suitable for this method. It is particularly advantageous in these methods that the free edges 2 and in particular the sealing edges 4 and 5 have an extremely low waviness due to the rolling production, which ensures an outstanding sealing result.

Reference character list for Fig. 1-5

10 forming device

 12 die

 14 profiling element / profiling roll

 16 metallic ring

 16a profile ring / profile ring section

 16-1 front peripheral edge

 16-2 rear peripheral edge

 16-3 lateral surface

 16-4 edge section

 18 support radii

 1 12 die

 1 12a first die ring

 1 12b second die ring

1 14 profiling roll 120 catchment area

 210 forming device

212 die

 214 profiling role

 222 wave

 226 screw connections

228 limiting component

230 delimiting component

232 wave

 DR arrow (direction of rotation)

GA die axis

 GB die width

 RA roller axle

 R arrow / radial direction

ZR interval

List of reference numerals to FIGS. 6 to 12

1 metallic sealing element

2 first free edge

 3 second free edge

 4 first sealing edge

 5 second sealing edge

 6 first arc section

7 second arc section

8 third arc section

surveys

 wells

10a first sealing part

10b second sealing part

1 1 inside Outside axial direction Radial direction blank

Narrow side edges Forming tool Roller punch Double arrow direction Die opening Cover plate Relief plate

Retaining plate

relief web

breech

Long hole

Shaft stump counter-relief shaft stub shifter groove

sliding webs

Tool carrier Form relief Axial direction Radial direction

contact force D _a outer diameter

Di inner diameter h height

h 'width

Γ length

 M central axis

 MW central axis

s starting material thickness s' material thickness

Ri, R ₂ , R ₃ radii

Claims

claims Method for producing a profiled ring, in particular a metal ring, comprising the steps:  Providing a cylindrical ring (16) as a blank with an axially forward and a rear peripheral edge (16-1, 16-2) and a lateral surface formed between the axial edges,  Arranging the cylindrical ring (16) in a mold, in particular a die (12), in such a way that the ring is temporarily supported, preferably in the region of the front and rear peripheral rings (16-1, 16-2), along the circumference of the ring (16), continuously sectioning the cylindrical ring (16) into a profiled ring (16) by applying pressure in a substantially radial direction (R) by means of at least one profiling element (14), the at least one profiling element (16) 14) and the mold (12) are moved relative to each other, in particular to each other to be rotated or / and each other linearly moved. The method of claim 1, wherein the cylindrical ring (16) is brought into abutment with its axial edges (16-1, 16-2) prior to the step of forming into a profiled ring on the forming tool (12) and is preferably clamped therein is rotated together with the mold (12) in rotation about a Gesenkdrehachse (GA). The method of claim 1 or 2, wherein the at least one profiling element (14) relative to the ring (16) in the radial direction (R) is moved to the inner periphery to press the lateral surface of the ring (16) in the radial direction to the outside. Method according to claim 3, wherein the at least one profiling element (14) is designed in a roll-like manner and during the forming process performs a rotational movement about its roller rotation axis (RA) offset in the radial direction and parallel in the axial direction to the tool rotation axis (GA). Method according to claim 4, wherein the rotational movement of the profiling element (14) is a passive rotary movement transmitted by the rotation of the forming tool (12) and the ring (16), in particular by friction, and / or an active rotational movement generated by a roller drive. Method according to one of the preceding claims, wherein the profiling element (14) exerts pressure in the radial direction on the ring (16) until the transformation of the cylindrical ring to the profiled ring is completely completed. The method of claim 6, wherein the ring (16) after completion of the profiling of the mold (12) is removed. The method of claim 6 or 7, wherein after completion of the profiling of the ring (16), the profiling element (14) in the radial direction (R) away from the ring (16) is moved to release it. Method for finishing a profiled ring, in particular a metal ring, comprising the steps: Providing the profiled ring,  Arranging the cylindrical ring in a mold, in particular a die, along the circumference of the ring continuous sectional forming of the reworked ring to a finished profiled ring by applying pressure in a substantially radial direction by means of at least one profiling element, wherein the at least one Profiling element and the mold are moved relative to each other, in particular to each other to be rotated or / and each other linearly moved. Method according to one of the preceding claims, characterized in that the profiled ring is compressed after shaping in the mold in its axial direction. Method according to one of the preceding claims, characterized in that the profiled ring is deformed after shaping in the radial direction to an oval. Method according to one of the preceding claims, characterized in that the method according to claim 1 is given as preforming step, then the method according to claim 1 in a second mold with a second roller die (Endformrollenstempel) profiling element is designed as a final molding step and / or Subsequently, the method according to claim 1 in a third mold with a third roller die (Kalibrierrollenstempel) formed profiling element is performed as a calibration step for the final production of sealing edges of the profiled ring. Method according to one of the preceding claims, characterized in that arc sections of the longitudinal section of the profiled ring are formed individually and in succession by means of a profiling element designed as a roller stamp. 14. The method according to any one of the preceding claims, characterized in that at least two arcuate portions of the profiled ring are formed simultaneously with a multiple roller punch. Method according to one of the preceding claims, characterized in that the mold has a smallest free inner diameter (Di) which is greater than the Endaußendurchmesser (D ₂ ) of the molded profiled ring or the blank, wherein the blank during the shaping step eccentrically arranged in the mold is and is in the circumferential direction only partially in contact with the relief of the mold and the counter-relief of the profiling element. Method according to one of the preceding claims, characterized in that a molding tool is used, in which the free inner diameter (D,) of the mold 1% to 40%, preferably 2% to 20%, ideally 3% to 10% greater than that Outer diameter (Di) profiled ring and the mold is designed as a non-divisible tool. Method according to one of the preceding claims, characterized in that the profiling element is a roller punch having a largest outer diameter (D _a ) which is smaller than the smallest free inner diameter (Di) of the molded profiled ring, wherein the blank during the shaping step eccentric is arranged with respect to the roller punch and is only partially in the circumferential direction with the mold relief in touch. 18. The method according to any one of the preceding claims, characterized in that the outer diameter (D _a ) formed as a roll stamp profiling element by 1% to 40%, preferably 2% to 20%, ideally 3% to 10% smaller than the smallest free Inner diameter (Di) of the molded profiled ring. 19. The method according to any one of the preceding claims, characterized in that the blank before molding by means of a Bo denstücks of the mold is positioned and / or held in the axial direction relative to the mold relief. A method according to claim 9, characterized in that the blank during the forming step by the bottom piece in particular additionally determined by the cover plate in an axial direction with respect to the mold, wherein advantageously the bottom piece and / or the cover plate during the forming step in the axial direction of the decreasing axial Height (h) of the blank to be adjusted adjusted. Method according to one of the preceding claims 19 - 20, characterized in that by means of the bottom piece and the cover plate during the forming step, an axial compression force is applied to the blank in order to support the flow of the material of the blank and the nestling of the blank to the mold relief. 22. Forming device for carrying out a method according to one of claims 1 to 21, wherein the forming device comprises:  a die (12) in which a ring (16) to be formed is receivable, at least one profiling element (14), wherein the at least one profiling element (14) and the die (12) are arranged such that they are movable relative to each other, in particular rotatable relative to each other and / or linearly movable, wherein the at least one profiling element (14 ) is designed such that in the radial direction (R) relative to the in the die (12) received ring (16) in sections pressure on the die (12) and the cylindrical ring (16) received therein is exercisable to the cylindrical ring (16) 16) to form a profiled ring. 23. Forming device according to claim 22, wherein the die (12) is rotatable about a Gesenkdrehachse (GA). 24. Forming device according to claim 22 or 23, wherein the at least one profiierungselement (14) is formed like a roll and is movable with its outer peripheral surface to a corresponding mold portion of the die (12), preferably such that during the forming of the cylindrical ring (16). to the profiled ring, the outer peripheral surface and the mold portion at least partially engage with each other. 25. Forming device according to claim 24, wherein the at least one profiierungselement (14) is rotatably mounted about a roller axis (RA). 26. Forming device according to one of claims 22 to 25, comprising a Gesenkantriebseinrichtung, which sets the die (12) about the Gesenkdrehachse (GA) in rotation. 27. Forming device according to one of claims 22 to 26, comprising a Profilierungsantriebseinrichtung which moves the at least one profiiierungselement (14) relative to the Gesenkdrehachse (GA) in the radial direction (R) relative to the die (12) linearly. 28. Forming device according to claim 25, wherein the profiling drive device sets the at least one profiling element (14) in rotation about the roller axis (RA) at least temporarily during the forming process. 29. Work machine, in particular punching and / or bending machine with at least one forming device (10) according to any one of claims 22 to 28. Sealing element as a profiled ring produced by a method according to one or more of claims 1 to 21. 31. Sealing element according to claim 30, characterized in that the 5 sealing element (1 in Fig. 6-8) in at least one edge region in cross-section a kink (3, 4 in Fig. 6-8), wherein the kink (3, 4 in Fig. 6 - 8) in the intended use of the sealing element (1 in Fig. 6-8) forms a sealing edge (3, 4). 32. Sealing element according to one of claims 30 or 31, characterized in that the sealing element (1 in Fig. 6-8) in longitudinal section at least two radially inwardly open and / or two radially outwardly open arc sections (6, 7, 8 in Figs. 6-8). 33. Sealing element according to one of claims 30 or 32, characterized in that the sealing element (1 in Fig. 6-8) is formed of steel, in particular of high-alloy nickel steel, e.g. made of Inconel 718 is formed. 20 34. Sealing element according to one of claims 30 to 33, characterized in that the sealing element (1 in Fig. 6-8) has a wall thickness of 0.1 mm to 0.3 mm. 35. Sealing element according to one of claims 30 to 34, characterized 25 shows that the sealing element (1 in Fig. 6-8) in the direction of its axial direction (100 in Fig. 6-8) is resilient. 36. Sealing element according to one of claims 30 to 35, characterized in that edge edge regions of the sealing element (1 in Fig. 6 - 8). 30 in the non-installed state of the sealing element (1 in Fig. 6-8) in approximately perpendicular to the central axis (M) of the sealing element (1 in Fig. 6-8) are aligned and during installation or during installation of the sealing element (1 in FIG. 6 - 8) by compression of the sealing element (1 in Fig. 6 -. 8) to the central axis (M) of the sealing element (1 in Fig. 6-8) are arranged sloping or rising, the kinks (3, 4 in Fig. 6-8) in the installed state, the sealing element (1 in Fig. 6 - 8) in terms of its axial extension (height h) limit. 37. Sealing element according to one of claims 30 to 36, characterized in that the sealing element (1 in Fig. 6 - 8) is designed as a ring, in particular as a circular ring or as an oval ring. 38. Sealing element according to one of claims 30 to 37, characterized in that radii (R1, R2, R3 in Fig. 6-8) of arc sections (6, 7, 8 in Fig. 6-8) of the sealing element (1 in Fig 6 - 8) are of different sizes. 39. Sealing element according to one of claims 30 to 38, characterized in that the sealing element (1 in Fig. 6-8) with respect to its spring rate in the axial direction (100 in Fig. 6 - 8) has a linear, progressive or degressive spring character.