WO2008022715A1

WO2008022715A1 - Device and method for producing a hollow body from a workpiece in the form of a round blank

Info

Publication number: WO2008022715A1
Application number: PCT/EP2007/007067
Authority: WO
Inventors: Werner HÜTTER; Benedikt Nillies
Original assignee: Leifeld Metal Spinning Gmbh
Priority date: 2006-08-24
Filing date: 2007-08-09
Publication date: 2008-02-28
Also published as: DE102006039656B4; US20100011830A1; KR20090066268A; BRPI0716581A2; DE102006039656A1; MX342763B; CN101528376A; MX2009001979A; CN101528376B; RU2445181C2; RU2009105676A

Abstract

The invention relates to a device for producing a hollow body from a workpiece (1) in the form of a round blank, comprising a shaping mandrel (11) mounted in such a way that it can be rotationally driven, a pressing element (18), which is likewise mounted on the machine bed in such a way that it rotates and can be displaced axially in relation to the shaping mandrel (11) for clamping in the workpiece (1), and comprising at least one shaping roller (31), which can be advanced axially and/or radially towards the shaping mandrel (11). In this case, it is provided that at least one shaping die (40) is arranged on the pressing element (18) and allows the shaping mandrel (11) to enter it axially in order to shape the workpiece (1), and that the shaping die (40) is axially displaceable with respect to the pressing element (18). The invention also relates to a method for producing a hollow body from a workpiece in the form of a round blank.

Description

Device and method for producing a hollow body from a ronde-shaped workpiece

The invention relates to a device for producing a hollow body from a ronde-shaped workpiece, in particular a spinning / flow-forming machine, with a forming mandrel which is rotatably mounted drivable for rotation about a rotation axis, a pressure element which is rotatable about the axis of rotation and for clamping the workpiece axially relative to Forming mandrel is slidably mounted, and at least one forming roller, which is deliverable axially and / or radially to the forming mandrel.

The invention further relates to a method for producing a hollow body from a blank-shaped workpiece.

Such hollow bodies can be used, for example, as a pressure vessel.

Pressure vessels, which have to withstand a filling pressure of up to several 100 bar, are used for compressible or liquid gases, such as CNG (compressed natural gas), LNG (liquefied natural gas) or high-pressure hydrogen gas. The pressure vessels are used, for example, in motor vehicles as compressed gas cylinders for natural gas tanks and for the hydrogen supply of fuel cells.

Various methods and devices for the production of pressure vessels are known from the prior art. DE 25 17 971 teaches, for example, to produce gas cylinders from a block. This block is perforated on a press such that a bottom part stops, and thus formed into a hollow cylinder with a one-sided bottom.

This hollow cylinder is further formed into a gas bottle blank and then cold-drawn to the final shape on a flow-forming machine.

DE 39 10 192 Al proposes to reshape pipe sections obtained by cutting lengths of hot-finished pipes by hot forming into a closed container. When molding the soil is formed on the inside in the floor center an upsetting nose, which is mechanically removed by an additional process step. Furthermore, it is provided to reduce the wall thickness of the central cylindrical part by cold working. Since the various process steps usually have to be carried out in different processing stations, the previously known method can also be comparatively complicated.

DE 197 11 844 B4 teaches a further method for producing a pressure vessel.

According to this method, a pot-like part is created from two rounds in the flow-forming process, wherein the pot-like parts are then welded together to the container. Welding can adversely affect the strength and corrosion behavior of the material.

From DE 16 52 630 C a method for the manufacture of cooking pots with a cylindrical wall is known.

According to this method, the rim of a blank is first turned cylindrical by pressure rolling and then stripped off.

It is an object of the invention to specify an apparatus and a method for producing a hollow body, in particular a pressure container, from a blank-shaped workpiece with which particularly resistant and dense hollow bodies can be produced simply and economically.

The object is achieved according to the invention by a device having the features of claim 1 and by a method having the features of claim 5.

Preferred embodiments are given in the respective dependent claims.

The inventive device is characterized in that at least one Umformmatrize is arranged on the pressure element, which is axially movable relative to the forming mandrel for forming the workpiece, and that the Umformmatrize is axially displaceable relative to the pressure element.

A first basic idea of the invention can be seen in arranging an additional forming die on a pressing and / or flow-forming machine so that the workpiece can be drawn into the die by axial movement of the die and / or of the forming mandrel and can be reshaped. This makes it possible to reshape the workpiece clamped in the machine into one and the same clamping in a deep-drawing or pressing operation and in a pressing and / or flow-forming process.

For example, by deep-drawing or pressing in the forming die a bottom portion of the hollow body can be formed and then formed by subsequent spin forming a cylindrical wall portion and / or a neck portion of the hollow body.

Another basic idea of the invention can be seen in providing the forming die axially displaceable on the pressure element. This makes it possible to retract the forming die after deep-drawing or pressing of the end face of the pressure element and the workpiece so that it does not hinder the supply of the at least one forming roller.

In particular, this also makes it possible to further process workpiece areas which were previously deformed by deep-drawing or pressing, then by pressing or by spin-forming, without it being necessary to first laboriously re-clamp the workpiece.

The inventive device thus allows a particularly simple, fast and thus economical production of the hollow body. Compared with other forming processes, process steps can be saved, such as intermediate annealing and necessary pickling and Bonsern for descaling.

Compared with the production from pipes, the inventive method is significantly cheaper. In addition, the flat sheet metal required as a starting material can not only be procured cost-effectively, but is freely available in a wide variety of sheet thicknesses.

A limitation of the container diameter on offered pipe cross sections does not exist. In addition to the method according to the invention, any desired diameter / wall thickness ratios can thus be set. It is thus given a high flexibility. Also, individual areas of the container can be adjusted freely in their wall thickness. Compared to the hot forming by forging fall for the inventive method significantly lower investment costs. Unlike necessary forging shapes, the inventive device can be used with high flexibility for a large variety of workpieces.

Suitably, the forming die surrounds the pressing element in an annular manner. The forming die advantageously has an inner contour which tapers with increasing axial distance from the extended forming mandrel.

The pressing element is preferably arranged in the vertex of the inner contour of the forming die. Depending on the desired bottom shape of the hollow body, the pressure element may for example have a convex, a concave or a flat end face.

The forming die is preferably displaceable in such a way that, in a working position, it protrudes axially beyond the end face of the pressing element facing the forming mandrel and is set back axially in a retracted position relative to this end face.

Suitably, the contour of the end face of the pressure element closes steadily in the forming position of the forming die to the inner contour of the forming die.

The versatility and operating speed of the device according to the invention can be increased by arranging in the forming mandrel and / or in the pressure element a punch which can be pushed forward from the forming mandrel or the pressure element for carrying out a forming pull. Such a stamp can be used for example for molding a container neck.

Preferably, the punch is axially, that is displaceable in the direction of the axis of rotation, wherein the axis of rotation suitably extends centrally through the punch.

The versatility of the inventive device can be further increased by the fact that the forming die has a plurality of die elements which are axially movable relative to each other. This makes it possible to perform several different forming processes in succession in the same clamping.

Suitably, the die members are coaxially arranged and / or surround each other like a ring.

In the method according to the invention for producing a hollow body from a blank-shaped workpiece, it is provided that a bottom region of the hollow body is formed by deep-drawing or pressing in a central region of the workpiece and an outer region of the rotated workpiece is transferred to a cylindrical shape by feeding at least one forming roller. in particular, press-rolled. It may be initially formed by a conical or funnel-shaped preform approximately by proj izier-pressure rollers.

This preform is then formed into one or more operations to the cylindrical shape.

The method can be carried out in particular by means of a device according to the invention, wherein the advantages explained in this connection can be achieved.

Another basic idea of the invention can be seen in the production of the hollow body initially to process the rondenförmige workpiece centrally by retracting into a forming die. The outer region of the workpiece can remain undeformed or, for example, can be transferred to a preferably frustoconical preform.

In a subsequent pressure or flow-forming process, the outer area is then transferred to a cylindrical shape.

With the method according to the invention, it is possible to produce a hollow body, in particular a pressure vessel, with particularly low weight, high strength and low contamination inside the container in a particularly energy-saving and economical manner.

The cost-effectiveness of the process according to the invention results, inter alia, from the use of round blanks, which are available inexpensively in finely graded thicknesses with good surface quality and low tolerance. The deep drawing or pressing can according to the invention include one or more Umformzüge.

It can be done according to the invention at a standstill, preferably also with a rotating workpiece.

The speed of the process can be further increased by carrying out the deep drawing or pressing of the center region and the folding of the outer region in the same clamping. For this purpose, a pressing / flow-forming machine is suitably used, in which a forming die is arranged in front of the forming mandrel. Preferably, a device according to the invention is used.

The economy of the method can be further increased by the fact that during deep drawing or pressing the outside area, in particular funnel-like, is transformed. According to this embodiment, the outer area is brought into a preform during deep drawing or pressing and then transferred to the cylindrical shape by means of a forming roller.

The workpiece is usually heated before deep drawing or pressing. The outdoor area is then very well malleable. Under a funnel-like shape, a particular rotationally symmetric shape with a tapered cross-section can be understood, wherein the wall can be convex, concave or straight in longitudinal section, so that in particular a conical shape is given.

Alternatively it can also be provided that during deep drawing or pressing the outer area is left undeformed. This can be advantageous in particular for workpiece materials which are difficult to work or for large diameter blank protrusions for large diameter and long pressure vessels.

A particularly high quality of the hollow body can be obtained by supporting the outer region during deep drawing or pressing.

For this purpose, for example, a preferably ring-shaped holding-down device can be provided, which is applied to the workpiece on the side facing away from the forming die. Additionally or alternatively, at least one support roller may be provided. For example, at least one support roller pair may be provided, in which case the workpiece is suitably carried out in the outer region between two adjacent support rollers of the support roller pair. It can also be delivered at least one forming roller, which supports the workpiece. If rollers are provided to support, the workpiece is suitably rotated slowly during deep drawing or pressing.

Particularly well-defined wall thicknesses result according to the invention in that the workpiece is stretched in the region of the cylindrical shape during folding or in at least one further roll overflow.

It can be set a defined wall thickness or a defined work hardening.

Furthermore, it may be advantageous that when stretching in an end region of the cylindrical shape, in particular by gap adjustment, a change in wall thickness is produced. A small wall thickness reduction can be used to produce a container neck and / or a fitting for filling. The edge thickness is preferably formed in multiple stages. Advantageously, this is provided when the wall thickness of the cylindrical shape is small and / or substantially diluted in relation to the starting thickness of the workpiece.

A particularly versatile method is given by the fact that the wall thickness is changed in the center area during deep drawing or pressing.

This can be achieved by a corresponding design of the pressure element and / or the forming die, the forming mandrel and the forming speeds and / or the forming force. It can also be increased wall thickness.

In particular, when a container connection is to be provided in the bottom region of the hollow body, it is advantageous that during deep drawing or pressing a preform formed as a perforated blank with a molded-on nose is used.

In principle, for example, pre-forms of embossed blanks with or without center bore, with or without lugs, with or without molded container bottom and / or conical or cup-like preforms can be used.

Preferably, by reducing the wall thickness material can be obtained, which is formed into a thickened nose.

For example, for producing a bottom-side container connection may alternatively or additionally be provided that, in particular after deep-drawing or pressing, removed in the bottom region by means of at least one roll of material and formed into a flange. This process step, which is suitably carried out in the same restraint as deep-drawing or pressing and / or folding, can however also be provided before deep-drawing or pressing.

Preferably, material is separated by means of at least one gap roller, which can then be formed, in particular by at least one chambered forming roller, for example to form a container connection, connecting piece or bottleneck.

It is also particularly advantageous that the workpiece is heated to a forming temperature above the recrystallization temperature prior to deep-drawing or pressing. Additionally or alternatively, heating may be provided before or after flipping, stripping and / or retracting the cylindrical shape. This can be done by known heating devices, such as gas burners or induction heating.

Preferably, the forming mandrel and / or the die can be heated by an internal heater.

Furthermore, it is according to the invention that, after the folding and in particular after the stretching of the cylindrical shape, the end region of the cylindrical shape is retracted by advancing at least one insertion roller and, in particular, forming a container neck, is closed.

As a result, the hollow body can be formed economically and quickly as a gas container.

The invention will be explained in more detail with reference to preferred embodiments, which are shown schematically in the drawings.

In the drawings show:

1 to 5 process steps in the implementation of the inventive method with an inventive device;

FIG. 6 shows the method step of FIG. 3 in a differently designed device according to the invention; FIG.

7 to 10 method steps of the inventive method according to a first variant with an inventive device;

11 shows the method step of FIG. 7 in a differently designed device according to the invention;

12 to 17 process steps of the inventive method according to a second variant with an inventive device;

18 and 19 process steps of the inventive method according to a third variant with an inventive device;

20 and 21 process steps of a fourth variant of the inventive method with a device according to the invention;

22 to 26 process steps of a fifth variant of the inventive method with a device according to the invention;

FIGS. 27 to 29 show a further process variant according to the invention;

Fig. 30 to 32 another variant of the method according to the invention;

Figures 33 to 35 show another embodiment of the invention for converting a collection of material to a container;

FIGS. 36 to 38 process steps of a further variant of the method according to the invention with a device according to the invention;

39 to 42 process steps of another variant of the inventive method; FIG. 43 shows method steps of the method according to the invention according to a further variant; FIG.

FIGS. 44 and 45 show method steps in carrying out the method according to the invention with a device according to the invention according to a further variant;

Fig. 46 concluding process steps in the manufacture of a gas container.

Equal or similar elements are indicated in all embodiments with the same reference numerals.

The different process variants can basically be freely combined.

Method steps of a method according to the invention with a device according to the invention according to a first exemplary embodiment are shown in FIGS. 1 to 5. According to the illustrated method, a ronde-shaped workpiece 1 is first heated in a feed device 51 with mounting on the forming temperature (FIG. 1). For this purpose, the feed device 51 may have, for example, an oven, a flame-generating device and / or an induction system.

Subsequently, the workpiece 1 is clamped in a device according to the invention designed as a press / flow-forming machine (FIG. 2). The pressing / flow-forming machine has a forming mandrel 11 and a pressing element 18, which lies opposite the forming mandrel 11 on the front side.

Forming mandrel 11 and pressure element 18 are rotationally driven about an axis of rotation 10 and arranged axially relative to each other displaceable on a machine bed, not shown. The pressing element 18 is surrounded by an annular forming die 40, which is displaceable relative to the pressing element 18 between a forming position shown in FIGS. 2 and 3 and a retraction position shown in FIGS. 4 and 5. In the forming position, the forming die 40 projects axially beyond the pressing element 18 in the direction of the forming mandrel 11.

The pressing element 18 and the forming die 40 can in particular be designed as a hydraulically actuated pressing unit.

As shown in Fig. 2, the workpiece 1 between the forming mandrel 11, which has the inner shape of the finished hollow body, at least its bottom, and the forming die 40, which together with the pressing member 18, the outer shape of the finished hollow body, at least in the region of the container bottom , has, clamped. Depending on the desired shape of the bottom of the hollow body, the pressure element 18 may be concave (FIG. 3), convex (FIG. 6) or flat (not shown).

In particular, a curved or circular contour can be provided.

As shown in Fig. 3, the forming mandrel 11 is then retracted axially into the forming die 40, wherein this relative movement is preferably carried out by simultaneous operation of the pressing member 18 and the forming die 40 on the machine bed with a fixed forming mandrel 11.

When retracting the forming mandrel 11 of the bottom portion of the hollow body is formed in a Umformzug in a central region 4 of the workpiece 1. At the same time, an outer region 5 located radially further outwards is converted into a conical surface (FIG. 3).

Subsequently (FIG. 4), the forming die 40 on the pressing element 18 is axially withdrawn from the forming mandrel 11 and thus removed from the working area.

The pressing element 18, which is arranged in the center of the forming die 40 and has a smaller diameter pressing disk than the forming die 40 at the end, furthermore presses the workpiece 1 in the bottom area against the forming mandrel 11.

The forming mandrel 11, the pressing element 18 and the workpiece 1 clamped therebetween are then set in rotation about the axis of rotation 10 and at least one forming roller 31 designed as a spinning roller is delivered to the workpiece 1. In at least one flow-forming overflow, the outer region 5 is applied to a cylindrical shape 8 on the forming mandrel 11, stripped and stripped from the forming mandrel 11 by means of a stripping device (not shown) (FIG. 5).

This method can be used in particular for medium-sized, well-shaped material and medium-sized blank supernatant.

For better reshaping, post-heating may be provided during the machining with the at least one forming roller 31.

A variant of the method according to the invention is explained in FIGS. 7 to 10.

In contrast to the embodiment described above, in which the entire workpiece 1 is formed during the pressing and / or deep-drawing, remains in the forming process shown in Fig. 7 of the embodiment of FIGS. 7 to 10, the outer region 5 of the workpiece 1 undeformed, that is , only a part of the workpiece is deformed.

Only in a further step (FIGS 8 and 9), the outer region 5 is first cylindrically folded by at least one forming roller 31 formed as a spinning roller and then in at least one roller overflow (Fig.

This variant of the method is particularly suitable for smaller tube blankets and thus for smaller containers.

Also in this case, the pressing element 18 may be convex (FIG. 11) or concave (FIG. 7) depending on the desired bottom shape.

Another variant of the method, which is particularly suitable for large workpiece thicknesses and / or difficult-to-machine materials, is shown in FIGS. 12 to 17.

In this variant of the method too, in the initial forming process, the workpiece is reshaped only in the center region 4, while the radially outward outer region 5 remains undeformed (FIGS. 12 and 13).

Thereafter, by pressing or projecting, a funnel-shaped preform is produced (FIGS. 14 and 15), the shell of which widens toward the opening area.

The funnel-shaped preform may have a constant or varying wall thickness.

By further pressing (FIG. 16), the outer region 5 of the workpiece 1 is applied to the forming mandrel 1 and converted into a cylindrical shape 8. In this case, it can be ensured that sufficient material is available for a later molding of a second container bottom and a connecting piece arranged thereon.

Subsequently (FIG. 17), the cylindrical shape 8 is drawn to finished dimensions by flow-forming in at least one overflow.

Another variant of the method is shown in FIGS. 18 and 19. Also in this process variant, only the center region 4 of the workpiece 1 is initially formed during pressing or deep drawing.

In order to avoid wrinkling in the outer region 5 of the workpiece 1 during forming, it is provided according to this method variant, the workpiece 1 to rotate slowly during the Umformzuges and support the outer region 5 by means of support rollers 61, 62. The support rollers 61, 62 form a pair of support rollers, wherein a support roller 61 supports the workpiece 1 on the part of the pressing member 18 and an adjacent support roller 62 on the part of Umformdorns 11. The axes of rotation of the support rollers 61, 62 are perpendicular to the axis of rotation 10 of the workpiece. 1

Another variant of the method, in which the workpiece 1 is supported during the Umformzuges, results from FIGS. 20 and 21.

In this variant of the method for supporting the outer region 5 of the workpiece 1 in the first forming pull on the side of the pressure element 18, a forming roller 31 is delivered to the outer region 5 of the workpiece 1 and the workpiece 1 is rotated slowly.

For the method variant shown in FIGS. 22 to 24, a device is used in which a punch 13, which is movable axially relative to the forming mandrel 11, is provided centrally in the forming mandrel 11. In the pressing member 18, a punch 13 corresponding recess 14 is provided.

In the variant of the method shown in FIGS. 22 to 26, two forming passes are carried out before the spinning.

In the first forming train (FIG. 23), as in the previously described exemplary embodiments, the pressure element 18, together with the surrounding forming die 40, is axially advanced on the machine bed and the opposing forming mandrel 11 is pushed into the forming die 40 while the workpiece 1 is deformed. In the subsequent second forming train (FIG. 24), the stamp becomes

13 front side of the mandrel 11 out into the recess

14 retracted. In this Umformzug from the forming mandrel 11 out in the direction of the pressing member 18, a container nose can be formed. If necessary, this container nose can subsequently be made to measure by means of a forming roller.

According to FIG. 25, the forming die is pulled back in order to form a free space for a subsequent forming roll 31.

According to FIG. 26, a targeted wall thickness profile 28 is produced by gap adjustment of the forming roller 31 during stripping.

For the method illustrated in Figs. 22 to 26, a center punched blank is suitably used.

As an alternative to the preceding method step according to FIG. 26, according to FIGS. 27 to 29 the outer edge of the workpiece 1 can be deformed by projecting in the axial direction into a conical shape by means of a forming roller 31, as shown in FIG. Subsequently, according to FIG. 29, the preformed workpiece can be transferred to the forming mandrel 11 by means of the forming roller 31 and be stretched in its wall thickness and finally formed into the cylindrical shape 8.

Another alternative is shown in Figs. 30-32.

In contrast to the method variant described above, the workpiece 1 is converted by means of the forming roller 31 into a bell-shaped or funnel-shaped preform in one or more roller overflows, as shown in FIG. 31 can be clearly seen. Subsequently, as in the previous method, the folding and final shaping of the cylindrical shape 8 by means of Umformrolle 31.Am according to FIGS. 33 to 35, a method variant is shown, in which on the workpiece 1 by means of a forming roller 31, a central material collection 3 can be formed which can be used for example for a container connection. In an outer region of the workpiece, the forming roller 31 is pressed into the wall of the workpiece and moved in the direction of the pressing member 18.

As a result, the displaced or partially separated material is displaced by the pressure element 18, which according to the invention can yield in the axial direction and thus form a free space for the material accumulation 3. In the material collection 3 can be introduced about a threaded bore for a valve element.

According to the process variant of FIGS. 36 to 38, a preform formed as a perforated blank with a molded-on nose 2 is used as the workpiece 1 during deep drawing or pressing. This is heated in the feeder 51 (FIG. 36). Subsequently, the container bottom is formed by a forming pull (FIGS. 37 and 38).

Also in this embodiment, the pressing member 18 has a frontal Aufnehmung 14, which receives the nose 2 during the forming process.

The nose 2 can serve as container connection in the finished hollow body.

In the process variant of FIGS. 39 to 42, the deep drawing or pressing for molding the bottom region of the hollow body (FIG. 40) and the subsequent folding of the outer region 5 (FIG. 42) are carried out in different restraints. In this case, a heating step may be provided both before deep-drawing or pressing and before the spinning-rolling (FIG. 39 or FIG. 41).

According to the embodiment of FIG. 43, a heating device with a holder and a forming tool are provided in the feed device 51.

In the embodiment of FIGS. 44 and 45, an inventive device is used, in which the forming die 40 has two coaxially arranged die elements 41, 42 which are axially displaceable relative to each other.

During the first forming draw shown in FIG. 44, the outer die member 42 is arranged to be flush with the inner die member 41 at the end face. As a result, the workpiece 1 is supported in its outer region 5 by the die element 42.

The forming mandrel 11 is thereby retracted to the forming of the central region 4 in the first die element 41.

In a further forming operation shown in FIG. 45, the inner, first die element 41 is withdrawn from the forming mandrel 11 and the second, outer die element 42 is advanced. As a result, the forming mandrel 11 also penetrates into the conical opening of the second die element 42, wherein the outer region 5 of the workpiece 1 is transferred in a funnel shape.

Subsequently, the outer die element 42 can be moved back from the mandrel 11 and the outer region 5 are folded over cylindrical by pressure rollers.

FIG. 46 shows a further method step which may be provided for closing the hollow body following the shaping out of the cylindrical shape 8.

In this method step, the workpiece 1 is heated to forming temperature, clamped by its bottom portion by means of a chuck in a pusher-drawing-in and ver-sets. The end region 7 of the workpiece 1 is then, optionally with further heat supply, closed by a pivotable Einziehrolle 38 in at least one overflow to a container neck with nose (Fig. 46 right) or without nose (Fig. 46 middle). In this case, the wall thickness of the container neck can be made thinner, the same thickness or thicker than the starting thickness of the workpiece.

Claims

PATENT CLAIMS

1. An apparatus for producing a hollow body from a ronde-shaped workpiece (1), in particular spinning and / or flow-forming machine, with

a forming mandrel (11), which is mounted for rotation about a rotation axis (10),

-a Andrückelement (18) which is rotatably mounted about the axis of rotation (10) and for clamping the workpiece (1) axially relative to the forming mandrel (11), and

at least one forming roller (31), which can be delivered axially and / or radially to the forming mandrel (11), thereby characterized,

in that at least one forming die (40), which is axially movable relative to the forming mandrel (11) for forming the workpiece (1), is arranged on the pressing element (18), and

in that the forming die (40) is axially displaceable with respect to the pressing element (18).

2. Apparatus according to claim 1, characterized in that e e n e c i n e t e that the forming die (40) surrounds the pressing element (18) like a ring.

3. Device according to one of claims 1 or 2, characterized in that on the forming mandrel (11) and / or on the pressure element (18) a punch (13) is arranged, which for performing a Umformzuges the front side of the mandrel (11) or the pressure element (18) can be advanced.

4. Device according to one of claims 1 to 3, characterized g e k e n e n e c i n e s that the Umformmatritze (40) a plurality of Matrizenelemente (41, 42) which are axially movable relative to each other.

5. A method for producing a hollow body of a ronde-shaped workpiece (1), in particular by means of a device according to one of claims 1 to 4, in which formed by deep drawing or pressing in a central region (4) of the workpiece (1) has a bottom portion of the hollow body will and

an outer region (5) of the rotated workpiece (1) by delivering at least one forming roller (31) to a cylindrical shape (8) formed, in particular projected, pressed or spin-rolled, is.

6. The method according to claim 5, characterized in that the deep-drawing or pressing of the middle region (4) and the folding of the outer region (5) are carried out in the same clamping.

7. The method according to any one of claims 5 or 6, characterized e e c e e n e e c h e n e that in deep drawing or pressing the outer region (5) is left undeformed or is formed funnel-like.

8. Method according to one of claims 5 to 7, characterized in that during deep drawing or pressing the outer region (5), in particular by means of at least one support roller (61, 62), is supported.

9. Method according to one of claims 5 to 8, characterized in that the region of the cylindrical shape (8) of the workpiece (1) is stretched in at least one roller overflow.

10. The method according to claim 9, characterized in that a specific wall thickness profile (28) is produced during stretching in an end region (7) of the cylindrical shape (8), in particular by means of at least one multi-stage draw roll (36) and / or by gap adjustment.

11. The method according to any one of claims 5 to 10, characterized in that after forming and in particular after the stretching of the end portion of the cylindrical shape (8) by feeding at least one Einziehrolle (38) is drawn and, in particular to form a container neck, is closed ,

12. The method according to any one of claims 5 to 11, characterized in that in the deep drawing or pressing the wall thickness in the central region (4) is changed.

13. The method according to any one of claims 5 to 12, characterized in that on the ronde-shaped workpiece (1) an opening with a hub (2) is formed.

14. Method according to one of claims 5 to 13, characterized in that, in particular after deep-drawing or pressing, material is removed from the bottom area by means of at least one roll and formed into a flange.

15. Method according to one of claims 5 to 13, characterized in that the workpiece (1) is heated prior to deep-drawing or pressing.

16. compressed gas container, produced by a method according to one of claims 5 to 16.

AMENDED CLAIMS received at the International Bureau on 17 December 2007 (17.12.2007)

1- Device for producing a hollow body from a ronde-shaped value piece (1), in particular Drüokund / od [beta] r Drücskwalzmascb-in [beta], with

a pressure element (18), which is rotatably mounted about the axis of rotation (10) and for clamping the workpiece (1) axially displaceable relative to the U [iota] tiformd [sigma] rn (11), and

at least one shaping roller (31), which can be distributed axially and / or radially to the forming mandrel (11),

at least one (c) door opener mat [beta] (40) is arranged on the change element [beta] nt (18), said section being axially displaceable relative to the contact element (18) and relative to the Uiaformdori. (11) for forming the workpiece (1) is axially verfahE'- bar, characterized g e k e n e c e e n e ,.

in that the apparatus is adapted to move the workpiece (1) to the ut [...] by axial movement of the forming matrise (40) and / or d [theta] <= ufff [alpha] m [lambda] d [sigma] jrns (H) alpha] fo [kappa] romatri2e (40) su and U [iota] uzuforrne [iota] i,

2. A device according to claim 1, characterized in that the reforming die (40) surrounds the pressing element (IS) in the manner of a ring.

3. Device according to one of claims 1 or 2, characterized in that a stamp (13) is arranged on the forming mandrel (11) of the ar [alpha] pressing element (IS), which is intended for. Performing a Ümfor [Pi] iauges foremost from the Ümformciorn (H) and the Andrü sigma] kelement (18) is vorschiebbar.

4. The device according to any one of claims 1 to 3, characterized in that the overfilling cam atritze (40) has a plurality of Mafcritzfenelottiente (41, 42) which are Varfahripar axially relative to each other.

5. Method eua Manufacture of a hollow body au [pound] a rön ^ - d [beta] n-shaped. Workpiece (D) by means of a [beta] [iota] device with a forming mandrel (11), which is rotatably drivably mounted about a Drahach.se (10), with a pressure element (18) which is rotatable about the axis of rotation (10) and for clamping the workpiece (1) axially relative to the [sigma] mforindorn (11) slidably gelsgart, and with at least one ümformn [alpha] atrize (40) which arranged on Andsückelement (18) and with respect to the pressing element (IS) axially displaceable is, and which is movable astially relative to the ümformclorn (11) for forming the WerKstüeks (1) / in particular by means of a device according to one of claims 1 to 4 / in which

an outer region (5) of the rotated workpiece (l) by delivering at least: an umforor roller (31) to a nylon reservoir (S) formed, in particular projected, pressed or pressed, becomes g [beta] fc e [pi ] nssic li ne ti,

-that by deep drawing or pressing in a central region (4) of the workpiece (1) a Bod [beta] nb [beta] r [beta] I dss hollow body is formed, - wherein the workpiece (I) by axial movement of Umformmstrize (40) and / or the mandrel (11) is pulled into the forming die (40) and thereby formed.

6, method according to claim 5, characterized g e c e n e c e n e,

<-> 'that the deep drawing of the presses of the center area (4) and the turning of the outer bar [bs] rsich.5 (S) are performed in the same voltage.

7. Method according to one of Claims 5 or 6, characterized in that, during deep-drawing or pressing, the outer region (5) is left undeformed or is funnel-shaped.

8, method according to one of claims 5 to 1, characterized in that e e n ce n e c e s that during deep drawing or eating, the outer region (5), in particular by means of at least one support roller (61, 62) is supported.

9. Method according to one of claims 5 to B, wherein the region of the cylindrical shape (8) of the workpiece (1) is extended in at least one roller overflow.

10 "method according to claim 9, characterized in that when stretching in an end region (7) of the cylinder shape (8) f, in particular by means of at least one multi-stage draw roller (36) and / or Spaltverstel-ment, a targeted wall thickness profile (28) is produced ,

11. A method according to any one of claims 5 to 10, characterized in that after the forming and in particular after the knitting, the final shape of the cylindrical shape (8) by feeding at least one of the isolated [] 38) is retracted and, in particular to form a container neck, is closed.

12. The method according to any one of claims 5 to 11, characterized in that in the deep drawing or pressing the wall thickness in the central pond (4) is changed.

13. The method according to any one of claims 5 to IZ, characterized in that on the ronde-shaped workpiece (1) an opening with the eleventh hub (2) is formed.

14. Method according to one of Claims 5 to 13, characterized in that, in particular, after deep-drawing or pressing, in the bottom region, by means of at least one roll, material is taken from the material and formed into a flange.

Declaration under Article 19 (O 1. Changes The new claims 1 and 5 contain the features of the original claims 1 and 5, wherein according to the original description page 3, paragraph 4, sentence 1 was also specified that the workpiece by axial movement of the forming die and / or the forming mandrel pulled into the forming die and thereby being transformed. Moreover, claim 5 features of claim 1, which were previously included only by means of a Rückbezieh [upsilon] ns, now explicitly included. Second

patentability According to the invention, it is provided to reshape a workpiece by means of one and the same machine on the one hand by pressing / flow-forming rollers and additionally also by pressing or deep-drawing. For this purpose, a spinning mill [iota] ne is provided which, as is known from the prior art, has a mandrel as well as a pressure element. With these elements, the workpiece can be clamped for spin forming. Furthermore, a displaceable forming die is provided. The invention is characterized in that, in order to carry out the additional forming step (pressing or deep-drawing), the forming mandrel is moved relative to the forming mandrel and the workpiece is sucked into the forming die and formed. According to document D1 (EP 1 110 641 A1), a spinning machine with an additional axially displaceable die 1S1 29 is provided.

In contrast to the invention, however, this die does not serve for the inventive [pi] forming of the workpiece by pressing / deep drawing, but merely as press-fed lining (compare sections 20 and 25 of D1, according to which the die 18, 25 to the workpiece only is created, "piaced in abutment"). According to the D1, the deformation is thus carried out exclusively by pressing. In contrast to the invention, no additional pressing or deep drawing is provided.

Accordingly, the device of D1 is also not adapted to perform a re-forming process by axially moving the forming die [theta] according to the attached claims 1 and 5. In the remaining printed documents mentioned in the International Journal, there is already no need for a (c) forming die which is axially displaceably mounted on a pressure element.