WO2016124402A1

WO2016124402A1 - Method and shaping device for the production of a hollow body

Info

Publication number: WO2016124402A1
Application number: PCT/EP2016/051127
Authority: WO
Inventors: Klaus Blei
Original assignee: Schuler Pressen Gmbh
Priority date: 2015-02-06
Filing date: 2016-01-20
Publication date: 2016-08-11
Also published as: DE102015101715A1; DE102015101715B4

Abstract

The invention relates to a shaping device (90) and a method for shaping a starting part (38) into a hollow body (50), having a neck part (46) as well as a shoulder section (70) which is connected to the neck part and which widens starting from the neck part. The hollow body (50) serves, for example, to produce aerosol bottles or beverage bottles from a metal material, such as aluminium or tin plate. Firstly, in a first shaping step U1, a pot-shaped starting part (38) is shaped, in order to form the hollow cylindrical neck part that is closed at one end on an axial end, and to form an intermediate wall (47) coaxially surrounding the neck part, which are coaxially surrounded by a hollow cylindrical wall (39). In a second shaping step, the neck part (46) is moved in relation to the hollow cylindrical wall (39), so that the intermediate wall is shaped into a shoulder section (70).

Description

Method and forming device for producing a hollow body

The invention relates to a method and a shaping device for producing a hollow body. Such hollow bodies are made of metal and have at least one metallic core, which may be coated with a plastic layer, for example in the production of can bodies in the food industry. Such Hohlkör ^¬ be used per can for various purposes, in ^¬ play, in the production of an aerosol can or ei ^¬ ner beverage bottle.

In particular, in the production of aerosol cans and beverage bottles is due to the bottle shape with a bottleneck and subsequent to the bottleneck ^¬ sequent, tapering towards the bottleneck shoulder section a large manufacturing effort required. The bottleneck and the shoulder portion are usually produced by means of so-called necking machines. Such a machine or a necking method are described in ^¬ example in US 2010/0199741 AI. In this case, an initially hollow-cylindrical container is formed in a plurality of individual steps more and more, until finally the desired shape of the bottle neck and Schul ^¬ terbereichs is reached. Such a method is very time consuming because the can bodies have to be transported between a plurality of individual forming stations and gradually deformed. It can be regarded as an object of the present invention Starting from this, the manufacturing to simplify a neck portion and a neck portion having at the at ^¬ closing, flared shoulder portion of a hollow body.

The object is achieved by a method having the features of claim 1 and a forming device with the features of claim 13.

According to the invention, it is provided to initially provide a pot-shaped output part. The cup-shaped Aus ^¬ gang part is fed to a first press or made in the first press in a preparatory forming step from a circuit board by forming.

Subsequently, at least a portion of the bottom of the pot-shaped starting part is reshaped in a first forming step. The forming takes place in such a way that a hollow-cylindrical neck part closed on one side is formed coaxially to a longitudinal axis of the starting part. The neck portion is closed by an originally central circular portion of the bottom of the cup-shaped initial part. The adjoining annular portion of the bottom is formed into the peripheral wall of the neck portion.

In this first forming step, an intermediate wall enclosing the neck part is also produced. Preferably, the intermediate wall is formed from the material, was ur ^¬ nally part of the bottom of the cup-shaped output part. In particular, the hollow cylindrical wall of the cup-shaped output part may ^¬ at the primary forming in materiality remain undeformed. But it is also possible that at least a part of the hollow cylindrical wall is formed during the first forming step.

The intermediate wall is coaxially enclosed by an outer Wandab ^{¬ section of} the hollow cylindrical wall. Thus, the neck portion is so to speak inverted into the outer wall portion of the hollow cylindrical wall and connected via the intermediate wall and curved transition areas with the outer wall ^¬ section without seam and joint. It is, so to speak, a eversion, similar to a rolling bellows.

Subsequently, in a second forming step, the holding part is displaced along the longitudinal axis relative to the outer wall section. As a result, during the second forming step, the intermediate wall is formed into a shoulder section which widens with respect to the longitudinal axis and connects the neck part and the outer wall section. During the second forming step, the peripheral wall of the neck portion can be at least partially reformed, insbeson ^¬ particular in the transition region between the neck portion and the intermediate wall or the resulting shoulder portion.

As a result, an edgeless or kink-free transition between the neck portion and the shoulder portion is created.

By this method, a cup-shaped starting ^¬ part can be converted very easily in a few steps. By forming the neck portion invaginated in the first forming step is verfüg ^¬ bar through the intermediate wall material in the second forming step for the formation of

Shoulder section is available. In this way, a high degree of deformation to form a neck portion and an adjoining, widening shoulder section can be achieved with just a few steps.

The inner diameter and / or the outer diameter of the neck part, which corresponds to a predetermined desired inner diameter or nominal outer diameter of the neck part of the finished hollow body, is preferably already obtained during the first forming step. A further deformation of the neck portion to achieve the desired inner diameter or the Sollaußendurchmessers is therefore not necessary.

It is advantageous if the hollow cylindrical wall after the second forming step has a wall thickness that is as large as a wall thickness of Schulterab ^¬ section and / or the neck part. During the first two forming steps, no or only a small ma- place terialfluss from the hollow cylindrical wall of the output ^¬ partly in the prepared shoulder portion or in the neck instead. The material for forming the Schulterab ^{¬ section} or the neck portion comes exclusively or almost exclusively from the bottom of the pot-shaped base. In the hollow cylindrical wall of the formed by the first forming step and the second forming step the workpiece is thus sufficient material available to provide the ge ^¬ desired wall thickness and the desired axial length of the hollow cylindrical Wad for the hollow body.

Preferably, the deformation in the first forming step and in the second forming step is performed such that the wall thickness of the shoulder portion and the Halstei ^¬ les after the second forming step are the same size. This is achieved in particular in that the wall thickness of the intermediate wall, the neck portion and the transition sections between the intermediate wall and the neck portion or between the intermediate wall and the outer wall portion have the same wall thickness.

It is also advantageous if the hollow cylindrical wall is formed after the second forming step. During this deformation, the wall thickness of the hollow cylindrical wall can be reduced and / or its axial length can be increased in the axial direction parallel to the longitudinal axis. This Umfor ^¬ tion can be performed, for example by means of a Abstreckprozesses. The wall thickness is reduced by, for example, 50% and is therefore smaller than the wall thickness ^{¬ of} the neck portion and / or the shoulder portion.

In a preferred embodiment, the neck portion and / or the shoulder portion is pressed after the second forming step or after stretching against a Domerflä- surface of a dome to plan the surface of the Schul ^¬ terabschnitt and / or the neck portion. As a result, bumps can be compensated.

It is advantageous if the first forming step for forming the initial part is carried out in a first press or press stage. Preferably, the forming of a circuit board in the output part in the first press or press stage can be performed. However, the preparatory ^¬ tend shaping the blank into the Ausgansteil can also take place in a separate press or press stage.

It is advantageous if the second forming step is carried out for forming the starting part in a second press or press stage. It is further provided with a ^¬ exporting approximately such that the forming of the hollow cylindrical wall or stretching in a third press or press stage is performed. The leveling of the surface may preferably be carried out in the third press or press stage.

It is also advantageous if the first forming ^¬ step and / or the second forming step are each performed by ei ^¬ nen single stroke of a press ram. The stretching and / or the leveling is preferably carried out in a single stroke by a press ram. Thus, it is possible to produce a hollow body with a neck portion and a shoulder portion quickly and efficiently: In a first stroke, a cup-shaped output part is made from a circuit board. Subsequently, in each case a working stroke of the first order ^¬ molding step and the second forming step executed.

Finally, there is a stretching and a leveling in a fourth stroke. With only four strokes, therefore, a hollow body with a neck portion, a shoulder portion and a hollow cylindrical wall is created.

A shaping device according to the invention for the manufacture ^¬ lung of a hollow body has a first press or Pres ^¬ grade to prepare on a movable along a first axis first press stamp. The first press ram has a forming section at its free end. In this forming section is coaxial with the first axis, a cylindrical central part is present, which is coaxially enclosed by a hollow cylindrical ring member. Between the central part and the ring part a ring recess is present.

The first press or press section also has a first dome, which is provided with the forming section of the first press section. Stamp works together. The first dome has a coaxial with the first axis arranged central Domerausnehmung. The Domerausnehmung is coaxially enclosed by an annular Domervertie- tion. Between the central Domerausnehmung and the annular Domervertiefung a hollow cylindrical dome projection is present.

The first press is set up by cooperating ^¬ act of the first press ram with the first dome to perform the first forming step. In this case, the first press ram engages with its forming section into the cup-shaped outlet part and rests against the floor. The bottom of the pot-shaped starting part is formed between the first press die and the dome. In this case the centering a ^¬ ralteil the first press plunger in the central dome ^¬ rausnehmung and the ring part of the first press plunger in the annular Domervertiefung engages. The intervening portion of the bottom of the pot-shaped starting part is reshaped, whereby the neck part and the intermediate wall arise.

In an advantageous embodiment, the first press is also adapted to transform a board into the cup-shaped output part. For this purpose, the first press or press stage may comprise a hollow cylindrical punch and a hollow cylindrical first hold-down. The hollow cylindrical punch surrounding the ers ^¬ th press ram coaxial. The hold-down coaxially surrounds the hollow cylindrical punch. The hollow cylindrical punch, the hollow cylindrical first blank holder and the first press punch can each be moved separately. The forming apparatus may further comprise a second press or press stage adapted to carry out the second forming step. The second press or press stage has a along a second axis bewegba ^¬ ren second press plunger, which has at a free end at least partially cylindrical end for engaging into the hollow cylindrical neck portion of the formed by the first press workpiece.

The second press or press stage also has ei ^¬ NEN second dome, which has a coaxial with the second axis arranged dome opening. Adjoining the dome opening is a domino surface arranged coaxially with respect to the second axis, whose distance from the second axis at least in sections increases towards the side which is associated with the second press ram.

Also is preferably a third press or press stage present, which has a movable along a third axis the third press ram and at least egg ^¬ NEN coaxial with the axis arranged the third ironing ring, the third press may preferably comprise a third dome. The third dome has a third dome opening adjacent to a dome surface coaxial with the third axis. The distance of the dome surface from the third axis increases at least in sections to the side associated with the third press ram.

Advantageous embodiments of the invention will become apparent from the dependent claims, the description and the drawings. Hereinafter, preferred embodiments of the invention with reference to the accompanying drawings explained in detail. Show it:

1 shows a schematic, block diagram similar representation of a first press ram, a first Never ^¬ holder, a hollow cylindrical punch and ers ^¬ th dome of a first press,

Figure 2 is a schematic representation of the components of the first press of Figure 1 and the forming of a

Sheet metal plate to a cup-shaped output part,

3 shows the schematic representation of the forming of the cup-shaped initial part in a first forming step with the aid of the first press ram and the first dome, FIG.

FIGS. 4 to 6 each show different situations during the forming of the workpiece formed in the first forming step in a second forming step by means of a second press,

Figure 7 is a schematic block diagram similar Dar ^¬ position of a third press die, at least one Abstreckrings and a third a third Domers

Press,

Figure 8 is a schematic view of the third pressing ^¬ stempels and third Domers for leveling a Teilbe ^¬ realm of the hollow body produced and

Figure 9 is a schematic block diagram similar ei ^¬ ner forming device with a first press, a second press and a third press. FIG. 1 schematically illustrates the parts of a first press 10 which are essential for explaining the invention. The first press 10 has a first press ram 11, which is arranged coaxially to a first axis AI. The first press die 11 is movable along the first axis AI.

At its free end, the first press stamp

11 a forming section 12. At this forming section

12 is along the first axis AI and coaxial therewith a pin-shaped, cylindrical central part 13 is present. The central part 13 has a right angle to the first axis AI aligned end face 14 and a subsequent to the Stirnflä ^¬ che 14 central part wall 15, which surrounds the first axis AI coaxial.

The central part 13 is coaxially enclosed by a hollow cylindrical ring part 16. The ring part has an inner ring part wall 17 and an outer ring part wall 18. In the embodiment, the two ring part walls 17, 18 are arranged coaxially to the first axis AI. The two annular ^¬ partial walls 17, 18 are connected to one another via a convexly curved first Ver ^¬ bond area 19th

Between the ring member 16 and the central part 13, a ring recess 20 is formed. The annular recess is bounded on the inside by the central partition wall 15 and outwardly through the nere in ^¬ ring member wall 17th The inner ring wall 17 and part of the central part of wall 15 passing through a concavely curved ge ^¬ second connecting surface 21 into each other.

To the first press 10 also includes a first dome 25. The first dome 25 has a coaxial with the first axis se AI arranged central Domerausnehmung 26 with a zy ^¬ lindrischen contour. Coaxially, the central Domerausnehmung 26 is enclosed by an annular Domervertiefung 27. The dome recess has a concave arched bottom 27a. The central Domerausnehmung 26 and the Domervertie- tion 27 are separated by a hollow cylindrical dome projection 28 from each other. A first press ram 11 toward facing edge surface 28a of the Domervorsprungs 28 is curved kon ^¬ vex.

The contour of the central Domerausnehmung 26 and the annular Domervertiefung 27 are adapted to the forming section 12 of the first press ram 11. If the order ^¬ mold section 12 with the first Domer 25 in engagement so remains between the central portion 13 and the central Do ^¬ merausnehmung 26 as well as between the ring member 16 and the annular Domervertiefung 27 is a gap, the gap width defining the wall thickness of the deformed portion of a workpiece ,

The first dome 25 has a first pretensioning device 29, which urges the dome 25 along the first axis AI toward the first press ram 11 into an initial position. The first biasing device 29 has, for example ^¬ one or more springs 30, such as coil springs, disc springs or the like. Instead of springs 30 and other means may be provided which can produce a elastic ^¬ cal force.

In the embodiment described here, the first press 10 also has a first hold-down 31 and a hollow cylindrical punch 32, which are arranged coaxially to the first axis AI. The first hold-down 31 encloses the hollow cylindrical stamp 32nd

A die tool 33 of the first press 10 has a die channel 34, which is coaxial with the first axis AI angeord ^¬ net and, for example, two substantially hollow cylindrical ^¬ rische sections, wherein the first portion 34 a has a larger diameter than the second portion 34 b of the die channel 34th At the transition point between the two sections 34a, 34b, an annular step having an annular surface 35 is formed. The annular surface 35 it ^¬ extends in a radially aligned with the first axis Al and has plane from the first Domer 25 out off the first hold-down 31st

On the die 33, a support surface 36 for a circuit board 37 is present. The bearing surface 36 is disposed around the mouth of a ^¬ Matrizenkanals 34 around. Opposite lying to the support surface 36 of the first hold-down 31 is arranged, which is adapted to press the circuit board 37 against the support surface 36.

In the exemplary embodiment, the first press 10 and to produce from a circuit board 37, a cup-shaped output ^¬ part 38 (Figure 2) is used. The cup-shaped output ^¬ part 38 has a hollow cylindrical wall 39, to which a bottom 40 is connected on an axial side. On the bottom 40 opposite side of the cup-shaped output member 38 is open. To convert the blank 37 into the pot-shaped output part 38, the first press 10 operates as follows:

The board 37 is placed on the support surface 36 ^¬ . Following this, the first hold-down 31 presses the board 37 against the support surface 36 and causes a predetermined clamping force. With the help of the hollow cylindrical punch 32, the board 37 is pulled into the first portion 34 a of the die channel 34, while the first Niederhal ^¬ ter 31 holds the board 37 under a predetermined voltage, so that it does not tear and no wrinkles bil ^¬ the. Pulling the blank 37 into the first section 34a of the die channel 34 forms the cup-shaped output part 38. Forming is completed when the hollow cylindrical punch 32 presses the edge of the bottom 40 against the annular surface 35. This situation is illustrated in FIG.

In a modification of the embodiment described here, the forming of the board 37 in a cup-shaped output part 38 can also be performed outside of the first press 10.

Starting from the situation shown in Figure 2, the cup-shaped output member 38 is now formed by means of the first press ram 11 and the first dome 25 umge ^¬ . First, the pot-shaped Augangsteil 38 is retracted into the second portion 34 b of the Matrizenenkanals 34 in order to achieve the desired dimensioning of the diameter of the bottom 40 and the hollow cylindrical wall 39. The longitudinal axis L of the cup-shaped output part 38 coincides with the first axis. Subsequently, the cup-shaped output part 38 is umge ^{¬ formed} in a first forming step Ul.

In the first forming step U1, the bottom 40 or a portion of the bottom 40 is deformed between the forming section 12 and the dome 25. As a result of this deformation, the cup-shaped output part 38 becomes a shaped first one Workpiece 45 generated. The reshaped first workpiece 45 has coaxial with a longitudinal axis L a hohlzylindri ^¬ rule, one-sided closed neck portion 46. The neck part 46 has a ^¬ perpendicular to the longitudinal axis L being directed ^¬ circular end face 46a and it is hollow cylindrical on ^¬ closing neck wall 46b. The neck portion 46 is therefore closed on one axial side. The end surface 46a is made from a central circular portion of the bottom 40 of the cup-shaped initial part 38 by forming in the first forming step Ul. The neck wall 46b is made from an annular portion of the bottom 40 of the pot-shaped base 38 by forming in the first forming step Ul. The neck portion 46 is formed between the centering ^¬ ralteil 13 of the first press die 11 and the central Domerausnehmung 26 of the first Domers 25th

In the first forming step U1, an intermediate wall 47 is formed between the ring part 16 and the dome projection 28. Because of the concavely curved cross-sectional contour of the second connecting surface 21 and the convexly curved edge surface 28a of the dome projection 28, a view is formed between the neck wall 46b and the intermediate wall 47 with an outside view Due to the concaved base 27a of the annular dome recess 27 and the convexly curved first connecting surface 19, a second transition portion 49 forms between the intermediate wall 47 and the hollow cylindrical wall

39 of the deformed first workpiece 45th

To carry out the secondary forming Ul of the first press die 11 along the first axis AI be ^¬ is moved. He sits on an inner area of the floor

40 of the cup-shaped output part 38 and pulls this into the second section 34b of the die channel 34. At ^¬ reduces the diameter of the hollow cylindrical wall 39, whereas the first wall thickness Dl is maintained.

The first press ram 11 moves the still hohlzy ^{¬-cylindrical} body out of the Matrizenkanal 34th Simultaneously or subsequently the remaining central portion of the original tray 40 reaches 25. In this case, at least 40 deformed part of the Bo ^¬ dens as described in contact with the first Domer and the neck part 46 and the intermediate wall 47 and the two transition portions 48, 49 educated.

The longitudinal axis L of the deformed first workpiece 45 or the cup-shaped output part 38 coincides with the first axis AI of the first press 10.

In Figure 3 will also be recognized that the neck part 46 after the first forming step Ul a wall thickness on ^¬ has, the 39th corresponding to the first wall thickness Dlentspricht, that is the same as the first wall thickness Dl of the hollow cylindrical wall, the wall thickness of the intermediate wall 47 in front ^{¬ also} preferably the first wall thickness Dl.

After the first forming step Ul the inner ^¬ diameter DI of the neck part 46 corresponds to worth an inner diameter set ^¬ and the outside diameter DA of the neck portion 46 an Au ßendurchmessersollwert for the neck portion 46 which is to be present on the finally produced hollow body 50th Further transformations to adapt the inner or outer diameter DI, DA of the neck portion 46 are therefore not necessary after the first forming step Ul. FIGS. 4 to 6 schematically and greatly simplified illustrate a second press 55, by means of which a second forming step U2 is carried out. Various stages during the implementation of the second forming step are shown schematically in Figures 4 to 6.

The second press 55 has a second press ram 56 which is movable along a second axis A2 and coaxial with this second axis A2. Coaxial with the second press ram 56, a second Niederhal ^¬ ter 57 is arranged. The second hold-down 57 is supported in the embodiment via a hold-down biasing means 58 on the second press die 56 and biased parallel to the second axis A2 in the direction of a second dome 59 of the second press 55 out. Alternatively could the second hold-down 57 56 coaxially also moves independently of the second press ram to the second axis A2 ^¬ the. The hold-down biasing means 58 may comprise, analogously to the first biasing means 29, one or more springs 30 or other biasing means.

The second hold-down member 57 has on the side opposite the hold-down pretensioner 58 side a free end portion 60, the contour of which according to the contour of the annular part 16 of the first press ram 11 ent ^¬ speaks. The outer diameter of the second blank holder 57 corresponds to the inner diameter of the hollow cylindrical wall 39 of the formed workpiece 45.

The second dome 59 has a dome opening 61 which is arranged coaxially to the second axis A2. The dome opening 61 is at least partially connected by a dome opening 61 to the dome opening 61. bordering Domerflache 62 limited. The Domerflache 61 is designed cup or funnel-shaped. It widens toward the end of the second dome 59, which faces the second press ram 56.

The second dome 59 also has a hollow cylindrical counter-holder 63. The counter-holder 63 is biased by a second biasing device 64 toward the second press ram 56 back. The second Vorspanneinrich ^¬ tion may be constructed analogous to the first biasing device 29.

The dome opening 61 and the dome surface 62 are arranged on a dome body 59 a, which is arranged fixed in Ausführungsbei ^¬ game compared to a machine frame of the second press 55. The counter holder 63 by ^¬ sets a coaxial with the second axis A2 arranged channel 65, which passes through the dome body 59a of the second dome coaxially to the second axis A2 and opens into the dome opening 61 of the second dome 59.

The counter-holder 63 has at its the second press ram 56 associated free end portion a contour corresponding to the contour of the dome projection 28 of the first dome 25 or may differ therefrom. In particular, the convex curvature at the edge can be formed differently than in the case of the domed projection. The wall thickness of the counter-holder 63 preferably corresponds to the wall thickness of the Domervor ^¬ jump 28 or may also be slightly smaller, so that the counter-holder 63 can engage in the region between the intermediate wall 47 and the neck wall 46b.

The second press die 56 has a free end 56a, to which a cylindrical end portion 56b connects. The end portion 56b merges into a connecting portion 56c in which the diameter of the second punch 46 increases. At the connecting portion 56c

is followed by a cylindrical portion 56d.

The outer diameter of the cylindrical portion 56d corresponds to the inner diameter of the second hold-down 57. In the end portion 56b and the connecting portion 56c, there is a gap between the outer surface of the second press die 56 and the second hold-down 57.

The second forming step U2 by means of the second press 55 is carried out as follows:

The second press ram 56 and the second hold-down device ^¬ ter 57 are inserted into the formed workpiece 45 so that the cylindrical end portion 56b in the region between the intermediate wall 47 and an outer wall portion of the hollow-cylindrical in the neck portion 46 and the end portion 60 of the second holding-down device 57 Wall 39 engages.

The second press ram 56 is moved with the hold-down 57 by a working stroke along the second axis A2. The longitudinal axis L of the formed workpiece 45 coincides with the second axis A2. Once the formed workpiece comes into contact with the Domerfläche 62 of the second Domers 59 45, the neck portion is removed from the shifted 46 In ^¬ suitable for indoor of the formed workpiece 45 relative to the hollow cylindrical wall 39 by continued movement of the second press ram 56th The second hold-down 57 presses the second transition section 49 against the Domerfläche 62. The force required for this is through the hold-down biasing device 58 generates. In addition, the counter-holder is displaced against the biasing force by the second biasing means 64. The force applied by the second biasing means 64 presses the backstop 63 against the first transition portion 48 of the deformed first workpiece 45. As the second press ram 56 continues to move, it pushes the backstop 63 out of the dome opening 61 farther and farther. The second hold-down device 57 clamps the formed workpiece 45 at the Domerfläche 62 fixed at a clamping point K (Figu ^¬ ren 5 and 6) while the second press ram 56, the neck ^¬ part continues to move and the original intermediate wall 47 and the transition sections 48, 49 to a Schulterab ^¬ cut 70 are transformed (Figure 6). The Schulterab ^{¬ section} 70 connects the holding part 46 with the hohlzylindri ^¬ rule peripheral wall 39, whereby a converted second workpiece ^¬ piece 71 is formed. By pulling the holding part 46 against the used by the second hold-down 57 at the nip clamping force K, the wall zwi ^¬ tween the clamping point K and the neck portion 46 at least substantially to the dome surface 62 of the dome body 59 a of the second dome 59 at. The contour of the reshaped second workpiece 71 corresponds to the area of the holding part 46 and the shoulder portion 70 to substantially the end ^¬ valid form that the hollow body is to receive 50th

In the figures 7 and 8, a third press 75 is schematically illustrated in the manner of a block diagram. The third press 75 has a third press ram 76 which is movable along a third axis A3. The third press ram 76 has an outer surface which corresponds to the desired inner surface of the hollow body 50 to be produced. It has a cylindrical end following a free end 76a. step end portion 76b, to which a connection ^¬ portion 76c connects the third press die, wherein the contour of the connection portion 76c substantially corresponds to the inner contour of the Domerausnehmung 61 of the second Domers 59th Connected to the connecting portion 76c is a cylindrical portion 76d of the third press ram 76. In this cylindrical portion 76 d cooling lines or cooling channels 77 may be arranged for cooling the further formed workpiece 71 and in particular the hollow cylindrical wall ^¬ 39 during subsequent stripping AS.

The third press 75 has an ironing channel (not shown in detail) with at least one ironing ring 78. In the illustrated embodiment of FIG 7 are available three ironing rings 78, which are arranged coaxially to the third axis A3 each ^¬ weils. In the ^¬ nendurchmesser the ironing rings 78 decreases in the direction of the working stroke of the third press punch 76th While the inner diameter of the first-arranged in the direction of the working stroke of the drit ^¬ th press punch 76 Abstreckrings 78, for example, according to still approximately to the external diameter of the cylindrical wall 39 of the further formed workpiece 71 corresponds to (pre-centering), the diameter of the downstream in the direction of the working stroke ironing rings reduced 78 always further until the inner diameter of the last ironing ring 78 corresponds to the outer diameter of the hollow cylindrical wall 39 of the hollow body 50 to be produced. In the embodiment here, the wall thickness of the hohlzy ^{¬-cylindrical} wall 39 is reduced from the first wall thickness Dl of a second wall thickness D2, whereby the axial length of the hollow cylindrical wall 39 corresponding to magnification ßert ^¬. In the stripping AS with the help of the third press 75 the neck portion 46 and the shoulder ^portion 70 to ^¬ next not further formed.

For grading of the neck portion 46 and the Schulterab ^¬ section 70, the third press 75 in Ausführungsbei ^¬ play on a third Domer 79th The third dome 79 has a dome opening 79 a, which is arranged coaxially to the third axis A3 ^¬ . A dome surface 80 with a first surface section 80a and a second surface section 80b adjoins the dome opening 79a. The first surface portion 80a of the dome surface 80 of the third dome 79 corresponds in dimension and contour to the dome surfaces 62 of the second dome 59 and thus has a funnel or cup shape. The first surface section 80a corresponds to the Kon ^¬ structure of the outer surface of the shoulder portion 70 at the near, ^¬ alternate hollow body 50. On the side with lower

Diameter of the first surface portion 80a passes into the second surface portion 80b, which corresponds to the inner surface ei ^¬ nes hollow cylinder. The diameter of the surface ^¬ section 80 b corresponds to the outer diameter of the Hal ^¬ steep 46th

The third dome 79 is displaceably mounted against the force of the third press ram 76 via a third pretensioning device 81, analogous to the first dome 25, and is prestressed in the direction of the third press ram 76. The third biasing device 81 may be analogous to the first biasing device 29 and, for example, one or more springs 30 or other biasing means aufwei ^¬ sen.

The third dome 78 is used for leveling P of the neck portion 46 and the shoulder portion 70. For this purpose, the deformed second workpiece 71 pressed after stripping AS by means of the third press ram 76 against the Domerfläche 80. The pressing force is limited by the third Vorspan ^¬ neinrichtung 81 or predetermined. At this time, the surface of the neck portion 46 and the shoulder portion 79 are smoothed. The hollow body 50 is made ready with its hollow cylindrical wall portion 39, the cup-shaped Schulterab ^¬ section 70 and the hollow-cylindrical, one-sided geschlosse ^¬ NEN neck portion 46th From the hollow body 50, a beverage bottle or an aerosol can can be produced in further steps.

The hollow body 50 can be made of a metal, for example. Aluminum, tinplate or the like. It can be painted or coated on one or both sides. It is also possible that already the circuit board 37 or the cup-shaped output part 38 are painted or coated on one or both sides.

The forming steps Ul, U2, the stripping AS and the leveling P can also be carried out with devices other than the presses 10, 55, 75 described here. It is also possible to perform the stripping AS and the leveling P in different facilities.

The presses 10, 55, 75 may also represent press stages of a transfer press or be designed as single presses in a press line. The workpieces 45 and 71 is moved by means not shown in detail between the individual presses 10, 55, 75. The presses 10, 55, 75 form a forming device 90 for producing the hollow body 50 (FIG. 9). The present invention relates to a Umformvorrich ^¬ device 90 and a method for forming an output member 38 in a hollow body 50, which has a neck portion 46 ^¬ as an adjoining and extending from the neck portion shoulder portion 70. The hollow body 50 is used, for example, for producing aerosol bottles or beverage bottles made of a metallic material, for example aluminum or tinplate. First Ul is cup-shaped From ^¬ transition part reshaped a 38 around which a ^¬ sided enclosed, hollow cylindrical neck portion and a neck portion coaxially surrounding the intermediate wall are enclosed 47 to for ^¬ men coaxially by a hollow cylindrical wall 39 at one axial end in a first forming step , In a second forming step, the neck portion 46 is displaced relative to the hollow cylindrical wall 39, so that the intermediate wall transforms into a shoulder ^portion 70.

Reference sign list:

10 first press

11 first press stamp

12 forming section

13 central part

14 face

15 central part wall

16 ring part

17 inner ring part wall

18 outer ring part wall

19 first connection surface

20 ring recess

21 second interface

25 first dome

26 central dome recess

27 annular Domervertiefung

27a reason of the ring-shaped dome deepening

28 dome projection

28a edge surface

29 first pretensioner

30 spring

31 first hold-down

32 hollow cylindrical stamp

33 matrix

34 die channel

34a first section of the template channel

34b second section of the template channel

35 ring surface

36 bearing surface

37 board cup-shaped output part

hollow cylindrical wall

Bottom formed first workpiece

neck

a end surface

b neck wall

partition

first transitional section

second transitional section

Hollow second press

second press stamp

a free end of the second press temple

b end portion of the second press temple

c connecting portion of the second Pressensempelsd cylindrical portion of the second press temple second hold-down

Hold-down biasing means

second dome

End portion of the second hold-down

Dome opening of the second dome

Domerfläche of the second Domers

backstop

second pretensioner

Channel shoulder section

formed second workpiece 75 third press

76 third press stamp

76a free end of the third press temple

76b end portion of the third press temple

76c connecting portion of the third press temple

76d cylindrical section of the third press temple

77 cooling channel

78 ironing ring

79 third dome

79a Dome opening of the third dome

80 dome area of the third dome

80a first surface section

80b second area section

81 third pretensioner

90 forming device

AI first axis

A2 second axis

A3 third axle

Asking off

Dl first wall thickness

D2 second wall thickness

DI inner diameter of the neck part

DA outer diameter of the neck part

L longitudinal axis

P leveling

Ul first forming step

U2 second forming step

Claims

Claims:

1. A process for producing a hollow body (50), comprising the following steps:

- Providing a cup-shaped output part (38) with a hollow cylindrical wall (39) and a bottom (40),

- Forming at least a portion of the bottom (40) of the cup-shaped output part (38) in a first forming step (Ul), so that coaxial with a longitudinal axis (L) of the output part (38) has a hollow cylindrical, one-sided closed neck part (46), one neck portion (46) about ^¬ closing intermediate wall (47) and the intermediate wall (47) enclosing the outer wall portion are formed, wherein the outer wall portion is part of the hohlzy ^{¬-cylindrical} wall (39),

- Further forming in a second forming step (U2) by moving the neck portion (46) along the longitudinal axis (L), wherein at least the intermediate ^wall (47) to ei ^¬ nem with respect to the longitudinal axis (L) widening shoulder portion (70) is formed connecting the neck portion (46) and the outer wall portion of the hollow cylindrical wall (39).

2. The method according to claim 1,

characterized in that the neck part (46) receives an inner diameter (DI) and / or outer diameter (DA) through the first forming step (U1) which corresponds to a predetermined desired inner diameter or nominal outer diameter. knife of the neck portion (46) of the hollow body (50) to be produced.

3. The method according to claim 1 or 2,

characterized in that the hollow cylindrical wall (39) after the first and / or second forming step (Ul, U2) has a wall thickness (Dl) that is as large as a wall thickness (Dl) of the Schulterab ^¬ section (70) and / or of the neck (46).

4. The method according to any one of the preceding claims,

characterized in that the hollow cylindrical wall

(39) after the second forming step (U2) is transformed, wherein the wall thickness of a second wall thickness

(D2) reduced and / or whose length is increased parallel to the longitudinal axis (L).

5. The method according to claim 4,

characterized in that the hollow cylindrical wall (39) after the second forming step (U2) by Abstre- (AS) is formed.

6. The method according to any one of the preceding claims,

characterized in that the neck portion (46) and / or the shoulder portion (70) after the second forming step (U2) or after stretching (AS) are pressed against a dome surface (80) of a dome (79) to level the surface (P).

7. The method according to any one of the preceding claims,

characterized in that the first forming step (Ul) for forming the initial part (38) in a first th press (10) or a first press stage leads durchge ^¬ .

8. The method according to claim 7,

characterized in that the output member (38) is made from a blank (37) by forming in the first press (10) or the first press stage.

9. The method according to claim 7 or 8,

characterized in that the second forming step (U2) for non-forms the output part (38) in a two ^¬ th press (55) or a second press step is carried out.

10. The method according to any one of claims 7 to 9 and according to claim 5 or 6,

characterized in that the forming of the hollow cylindrical wall (39) or the stripping (AS) in a third press (75) or a third press stage is performed.

11. The method according to claim 6 and any one of claims 7 to 10,

characterized in that the leveling of the Oberflä ^¬ che in the third press (75) or the third press stage is performed.

12. Forming device for producing a hollow body (50), with a first press (10) or a first press stage, which has a first axis (AI) movable first press ram (11), which on a free end has a forming section (12), wherein the forming section (12) has a coaxial with the first axis (AI) arranged cylindrical central part (13) which is coaxially enclosed by a hollow cylindrical ring member (16), wherein between the central part (13 ) and the ring part (16) a ring ^¬ recess (20) is present, wherein the first press (10) or the first press stage has a first dome (25), wherein the first dome (25) coaxial with the first axis ( AI) arranged central Domerausnehmung (26), of an annular Domervertiefung

(27) is coaxially enclosed, wherein between the central Domerausnehmung (26) and the annular Domervetiefung (27) has a hollow cylindrical dome projection

(28) is provided, wherein the first press (10) or the first press stage is adapted to move the first press ram (11) along the first axis to the first dome (25), so that the central part (13) in the central Dome ^¬ recess (26) and the ring member (16) engages in the annular Domervetiefung (27), thereby forming a da ^¬ intermediate portion of a cup-shaped output member (38).

Forming device according to claim 12,

characterized in that the first press (10) or the first press stage for forming a blank (37) in a cup-shaped output part (38) has a hollow cylindrical and a hollow cylindrical first blank holder (31), wherein the hollow cylindrical punch (32) coaxial with the first punch (11) and the hold-down (31) is arranged coaxially with the hollow cylindrical punch (32).

Comprises forming device according to claim 12 or 13, with a second press (55) or a second press step, the second press ram a along a second axis (A2) movable (56) having an at least partially zy ^{¬-cylindrical} end portion (on a free end 56b ), having for engagement in a hollow cylindrical neck portion (46) of one (by the first press 10) or the first press stage vice form ^¬ th workpiece (45) wherein the second press (55) or the second pressing ^¬ stage a second Domer (59 ) which is a koa ^¬ xial (to the second axis A2) arranged Domeröffnung

(61), wherein to the dome opening (61) a koa ^¬ xial to the second axis (A2) arranged Domerfläche

(62) is adjacent, wherein the second press (55) or the second press ^¬ stage is arranged to move the second press ram (56) along the second axis (A2) to the second dome (59), so that the second press ram ( 56) (with its end portion 56b) a ^¬ engages the neck portion (46), said second press ram (56) moves the neck ^¬ part (46) of the (by the hollow cylindrical wall 39) limited inside area of the formed workpiece (45) when the formed workpiece (45) on the Domerfläche (62) is supported, whereby a be ^{¬ zogen} on the second axis (A2) widening shoulder portion (70) is formed, which connects the neck portion (46) and the hollow cylindrical wall (39).

15. Forming device according to one of claims 12 to 14, with a third press (75) or press stage, which has a third axis (A3) movable third press ram (76) and at least one coaxially to the third axis (A3) arranged ironing ring ( 78).

16. Forming device according to claim 15,

characterized in that the third press (75) ei ^¬ NEN third Domer (79), which has a coaxially with the third axis (A3) arranged Domeröffnung (79a), wherein the Domeröffnung (79a) coaxially to the third axis (A3) arranged adjacent Domerfläche (80) whose distance from the third axis (A3) ^{¬ at} least partially to the third press ram (76) associated side of the third dome (79) ^¬ takes.