EP2460599B1 - Method and device for producing a cup-shaped sheet metal piece with interior and exterior teeth - Google Patents

Description

The invention relates to a method and an apparatus for producing an internally and externally toothed pot-shaped sheet metal part according to the preamble of claim 1 and according to the preamble of claim 4, such as from US 5,953,947 known.

A method and a device suitable for this purpose is, for example, with the subject of WO 2009/124534 A2 known. In this known method, the toothless pot-shaped sheet metal part is pushed onto an outer toothing formed with one of the internal teeth of the sheet metal part rolling roll and then rolled the outer profile on the cup-shaped sheet metal part by the cup-shaped sheet metal part together with the rolling mandrel through a parallel to the central axis on the sheet metal part is pressed under exercise of a radial pressure rolling profile roller set, whereby the material is pressed into the tooth grooves of the profile mandrel. The content of this document is intended to be fully encompassed by the present invention.

In this known method, the rolling tool consists of a plurality of evenly distributed on the circumference arranged profile rollers, which must be used for producing the teeth of the sheet metal part in different planes arranged profile roller sets.

With an upper profile roller set a preforming of the longitudinal grooves is exerted in the sheet metal part and the preformed sheet metal part is then either moved to another Rollumformwerkzeug and finally rolled there, or there are several sets of rollers arranged vertically one above the other, the one set of rollers preforming and the other set of rollers Finished forms of the tooth grooves of the toothed sheet metal part performs.

Disadvantage of the known method is that the tooth shape of the sheet metal part must be produced in different operations, which is associated with a high workload.

Another disadvantage is that differently shaped profile rollers in the form of different profile roller sets must be used, which greatly increases the cost of such Rollumformwerkzeug.

In the prior art, it is known to form the profile rollers symmetrically, which means that the deforming lateral surface (rolling circumference) of the profile roller is formed absolutely symmetrical. It is a mirror symmetry to the longitudinal center axis, as for conventional profile rollers in the FIGS. 5a and 5b of the present application. The profile rollers 40 and 41 shown there belong to the prior art.

Characteristic of this prior art is that with the conventional profile roller 40 according to FIG. 5a and the central roll collar formed there, a first forming of the Längsprofilnut is carried out in the sheet metal part, while arranged in the working direction behind or arranged in another tool, the second conventional profile roller 41 and the smooth shoulder collar 19, the final shaping of Längsprofilnut in the sheet metal part.

With the publication US 5,953,947 a method and an apparatus for producing an internally and externally toothed cup-shaped sheet metal part is disclosed. In the device profiled rollers are arranged on a stationary profile roller set evenly on the circumference. The profile rollers are symmetrical and arranged exactly parallel to each other. Each profile roller has a centrally arranged, broad, protruding bead with which it engages exactly in the groove base of the respective groove and is supported laterally on the groove base.

When twisting symmetrical profile rolls, however, there is the disadvantage that one can not combine several working steps in one roll.

The invention is based on the object, a method and apparatus of the type mentioned in such a way that with less use of tools, preferably with only a profile roller set, a finished molding of the longitudinal grooves in the sheet metal part is possible without different profile roller sets with differently shaped Profile roles needed.

To achieve the object, the invention is characterized by the features of claim 1 and claim 4.

An essential feature of the invention is that in a single process step in the course of a single press stroke (upward and downward movement of the rolling mandrel), a finished shaping of the longitudinal grooves in the sheet metal part takes place.

With the given technical teaching, there is the significant advantage that it is no longer necessary to first perform a preforming and then a final shaping of the longitudinal grooves in the sheet metal part, but that in the course of a single press stroke (downstroke and subsequent upstroke) a final Forming the longitudinal grooves in the sheet metal part is possible for the first time.

This means that only a single profile roller set is needed to allow a final shaping of the longitudinal grooves in the sheet metal part, which was previously unknown.

According to the invention eliminates the preforming and the final shaping of the longitudinal grooves in the sheet metal part with different profile roles and it is only a single profile roller set used to allow during a downward and an adjoining upward stroke of a rolling mandrel final shaping of the longitudinal grooves in the sheet metal part.

The invention provides in a development of the present invention, that in addition to the final shaping of the longitudinal grooves in the sheet metal part, a calibration followed.

Such a calibration can be carried out, for example, by a calibration ring which penetrates with its calibration teeth and with its calibration base into the already formed longitudinal grooves of the sheet metal part and moves longitudinally along, so as to provide for the production of a final dimensional accuracy. The calibration is in the tenths of a millimeter range and is not comparable to preforming and final molding in the prior art.

It should be noted that calibration is not essential, but it is preferred to obtain such a calibration for obtaining particularly dimensionally stable sheet metal parts.

To achieve the task of achieving a final shaping of the longitudinal grooves of the sheet metal part with a single profile roller set and the profile rollers arranged there, asymmetrical profile rollers are used instead of mirror-symmetrical profile rollers. All asymmetrical profile rollers are rotatably mounted on respective axle and distributed uniformly around the circumference and thus form a single profile roller set, which is intended for the final formation of the longitudinal grooves of the sheet metal part.

As a counterhold for the asymmetrical profile rollers, a rolling mandrel is used, which penetrates into the interior of the cup-shaped sheet metal part and the longitudinal grooves supported from the inside, so that the asymmetric profile rollers penetrate with their associated roller collars and shoulder collars in the associated identically profiled recesses in the region of this rolling mandrel and there lead to a deformation of the sheet metal part. Thus, the sheet metal part is deformed radially inwardly directed by the asymmetric profile rollers arranged outside in the direction of the radially outwardly directed rolling mandrel, wherein the rolling mandrel shape substantially corresponds to the later profile shape of the longitudinal grooves of the sheet metal part.

The invention will now be described in more detail with reference to the drawings. Here are the drawings and their description further advantages and features that are claimed in a single position, but also in combination with each other as essential to the invention.

Figur 1:

Eine perspektivische Ansicht auf den Profilrollensatz mit dem darunter angeordneten Kalibrierring.

Figur 2:

Schnitt durch ein Werkzeug in einem Arbeitszustand, bei dem sich das Werkzeug wieder im Aufwärtshub befindet.

Figur 3:

Schnitt durch das Rollumformwerkzeug mit dem darunter sichtbaren Kalibrierring.

Figur 4:

Eine vergrößerte Ansicht nach Figur 3

Figur 5 a und b:

die beiden Profilrollen nach dem Stand der Technik.

Figur 5c:

die neuartige Profilrolle nach der Erfindung.

Figur 6:

eine vergrößerte Prinzipskizze der asymmetrischen Rollumformung.

Figur 7:

eine perspektivische Ansicht auf den Innenraum des Kalibrierringes.

Figur 8:

die Draufsicht auf den Kalbrierring

Show it:

FIG. 1:

A perspective view of the profile roller set with the calibration ring arranged underneath.

FIG. 2:

Section through a tool in a working state, in which the tool is again in the upstroke.

FIG. 3:

Section through the roll forming tool with the calibration ring visible underneath.

FIG. 4:

An enlarged view FIG. 3

FIG. 5 a and b:

the two profile rollers according to the prior art.

FIG. 5c:

the novel profile roll according to the invention.

FIG. 6:

an enlarged schematic diagram of asymmetric roll forming.

FIG. 7:

a perspective view of the interior of the Kalibrierringes.

FIG. 8:

the top view of the Kalbrierring

In FIG. 1 is shown in perspective the top view of a Rollumformwerkzeug, which is formed from a single profile roller set 44 with asymmetrical profile rollers 2. The profile roller set 44 is arranged below a lid 10 and each individual profile roller according to FIG. 2 is rotatably mounted on a pivot pin 14. The axle bolts 14 are received in a housing 5 fixed to the housing.

However, the scope of the invention also relates to axleless mounted in a tool carrier profile rollers.

Thus, the profile roller set 44 forms with its inner contour a central recess 16 according to FIG. 1 , in which the sheet metal part 1 to be formed is used and is formed with a press stroke, which is then executed both in the direction of arrow 12 downwards and in the direction of arrow 13 upwards.

The embodiment of the FIGS. 1 and 2 also shows that it is still possible to arrange an additional calibrating ring 3 on the profile roller set 44, with which a finished shaping of the longitudinal grooves 30 of the sheet metal part 1 takes place can provide additional calibration of the longitudinal grooves 30 produced in the sheet metal part 1.

The calibration ring 3 consists of a number of spaced apart Kalibrierzähnen 17, between which conical surfaces are arranged, which are referred to as Kalibriergrund 27. More details will be later on the basis of FIG. 7 explained.

Out FIG. 2 can be found more details of Rollumformwerkzeuges.

In the interior of the sheet metal part 1 to be formed, a rolling mandrel 4 is arranged, whose outer contour corresponds to the later auszuformenden contour of the longitudinal grooves 30 of the sheet metal part 1. The rolling mandrel 4 acts as a counter-holder and is for example in FIG. 4 drawn.

The rolling mandrel 4 is connected to an upper receptacle 8, wherein the drive for the receptacle 8 in conjunction with the rolling mandrel 4 by a press die, not shown, which is capable of the entire structure of rolling mandrel 4 and recording 8 in the direction of arrow 12th down to push through the profile roller set 44 or in turn to raise upward, in each case the asymmetrical profile rollers 2 of the profile roller set 44 for engagement with the sheet metal part 1 to be formed in the downward and in the upward stroke.

In the housing-fixed receptacle 5, a lower lid 6 is still attached. This cover 6 receives the profile roller set 44 and fixes the individual asymmetrical profile rollers 2 grasped in the cassettes 24 in such a way that the required rotational offset angle 36 is obtained for the sheet metal part 1.

The counter holder 7 holds the sheet metal part 1 against the rolling mandrel 4 and moves with the entire part 8, 4 with.

The housing-fixed frame 9 takes the profile roller set 44 together with the receptacle 5 and the cover 6.

It is still the aforementioned calibration ring 3 is shown, which has on the upper side an oil-bearing lubrication groove 11 which rotates on the circumference.

The FIG. 2 shows a working state, which arises from the fact that the receptacle 8 was moved in conjunction with the attached rolling mandrel 4 in the direction of arrow 12 down and the sheet metal part 1 already finished by the profile roller set 44 was pressed and only a calibration in the calibration ring 3 learns. This condition is in FIG. 2 shown.

The profile rollers 2 have rotated during the downstroke in the direction of arrow 12 and in the direction of arrow 15.

The rotation takes place about the axis of rotation, which is given by the respective axle pin 14. After completion of the downstroke in the direction of arrow 12, the return stroke in the direction of arrow 13 takes place. The only optionally existing calibration ring 3 is thus passed through twice.

Of course, the invention also includes the kinematic reversal such that the profile roller set (44) is movably driven with or without the calibration ring (3) and that the sheet metal part 1 with the rolling mandrel (4) is stationary.

The FIG. 3 schematically shows the top view of the calibration ring 3 with its Kalibrierzähnen 17, which are circularly alternated by each recessed Kalibriergrunde 27.

It can also be seen how two asymmetric profile rollers 2 are aligned with respect to the calibration ring 3. From the FIGS. 3 and 4 the asymmetry of the profile rollers 2 can be seen after the flank angle Y (37) of the flank 20 deviates from the flank angle X (38) of the flank 20a.

Only example is in FIG. 3 the deformation region 43 of a profile roller 2 shown. It extends from one flank of a longitudinal groove to the same flank 20 of the other longitudinal groove.

Out FIG. 4 and FIG. 5c shows that the asymmetric profile roller consists of a roll collar 18 of increased diameter, which is followed on the left by a flank 20a, which forms a first flank angle 38 (angle X), while on the other side of the rolling collar 18 in the transition to the cylindrical itself adjoining shoulder collar 19 is followed by a second flank 20 having the second flank angle Y (37).

The asymmetric roll collar 18 is followed by a shoulder collar 19 having cylindrical rolling surfaces. These relationships are in FIG. 4 shown.

For illustrative simplification reasons, the same groove shape having inner rolling mandrel 4 is not shown, which rests positively on the sheet metal part 1 from the inside and this is supported.

Only the calibration ring 3 is shown, which after the roll forming for a final calibration in pushing the sheet metal part through the calibration ring 3 according to FIG. 2 provides.

It should be noted that the final shaping of the longitudinal groove 30 of the sheet metal part 1 is already achieved by the single profile roller set 44 with the asymmetrical profile rollers 2 in a single downward and an adjoining upward stroke.

In FIG. 4 It can be seen that each profile roller 2 with its longitudinal center axis forms a radius beam, which unites in the center 45 of the profile roller set and thus of the sheet metal part 1.

Furthermore, it can be seen that the angle Y (37) of the flank 20 is smaller than the angle X (38) of the flank 20a, so that there is an asymmetric attack of the asymmetric rolling collar 18 in the interior of the sheet metal part 1.

Thus, longitudinal grooves 30 are formed with a groove bottom 31, which is aligned centrally to the center 45. It is therefore a rotationally symmetrical sheet metal part.

However, the side edges 32, 33 adjoin the groove bottom 31, which are formed absolutely symmetrical to each other, so that it comes after rolling to a rotationally symmetric and also longitudinally symmetrical sheet metal part 1 with symmetrical longitudinal grooves 30 and accordingly symmetrical Nutengrunden 31.

The side flanks 32, 33 are therefore designed to be equally inclined, although the asymmetrical profile rollers 2 engaging therein each have an asymmetrical rolled collar 18.

This difference between the asymmetry of the rolling collar 18 of the respective asymmetrical profiled roller 2 and the symmetrical sheet metal part 1 finally produced therefrom is effected by providing a so-called circular (circumferentially rotated) relative rotational offset angle 36 between the roll forming tool and the sheet metal part FIG. 4 is registered. The rotational offset angle is the angle that results between the radius line 35 as a longitudinal symmetry line through a profile roller 2 at the intersection with the center 45 and a central center line 34, consisting of a radius line 34 which is formed as a line of symmetry through the longitudinal groove 30 of the sheet metal part 1.

In this way, an absolutely symmetrical sheet-metal part 1 is produced with an asymmetrical profile roller and an associated rotational offset angle 36.

By adjusting the relative rotational offset angle 36 of the profile roller set 44 of the total existing profile rollers 2 with respect to the radius line 34 through the sheet metal part 1, a symmetrical sheet metal part is still achieved.

This results in the advantage of the invention, because by the change of the rotational offset angle 36 (this can be reduced, for example) and a asymmetrical sheet metal part 1 can be generated, in which the side edges 32, 33 of the sheet metal part deviate from each other in their inclination.

Accordingly, symmetrical or asymmetrical sheet-metal parts with longitudinal grooves uniformly distributed on the circumference can be produced with such a roll-forming tool.

It is also added that the axis line 46, which is the center of rotation of the axle 14, must be at right angles to the radius line 35.

As is clear from the FIGS. 5a and 5b (Prior art), previously two symmetrical profile rolls were necessary, and according to the invention according to FIG. 5c Now, a single asymmetrical profile roller 2 is used, which according to the prior art symmetrical profile rollers after Figure 5a and Figure 5b united in itself.

It is important that the asymmetrical profile roller 2 has an enlarged diameter roll collar 18, followed by the side sloping flanks 20, 20a, but the flanks 20, 20a differ in their flank angle.

It is essential that the adjoining one side of the rolling collar flank 20a, which faces away from the shoulder collar 19 with a smaller diameter, a smaller flank angle Y, as compared to the flank 20, which is directly adjacent to the shoulder collar 19 of smaller diameter asymmetrical profile roller connects. This flank angle of the flank 20 is denoted by X and is also designated later by the reference numeral 38.

It is therefore an asymmetric profile roller, in which the enlarged diameter formed in the roll collar 18 has two different flank angles and this merges on one side in a shoulder collar 19, which has a reduced diameter compared to the roll collar 18.

The lateral surface of the shoulder collar 19 is based on the symmetry line of the profile roller (longitudinal symmetry line) cylindrical and parallel to the axis of rotation of the asymmetrical profile roller.

From the above description it follows that the enlarged in diameter roll collar 18 penetrates deeper into the sheet metal part as compared to the reduced diameter subsequent shoulder collar 19, so that there is an asymmetric deformation of the longitudinal groove of the sheet metal part 1.

It is important that the profile roller set in total by a circular angular displacement angle 36 (see FIG. 6 ) is offset with respect to a symmetrical radius line 34 to the sheet metal part. It is therefore in principle a relative, one-time preset rotational movement of the profile roller set in the circumferential direction with respect to a (thought detained) sheet metal part. For example, if you hold the sheet metal part and the profile roll set by a rotation angle (rotation offset angle 36) with respect to the detained sheet metal part on the circumference (circular) twisted and then firmly mounted to the sheet metal part, you will get to the graphical representation FIG. 6 , It is therefore a circular rotational offset between the profile roller set and the rolling mandrel to which the entire profile roller set of asymmetrical profile rollers is arranged offset to a fixed sheet metal part 1.

The more details FIG. 4 arise in FIG. 6 ,

In FIG. 6 is drawn in dashed lines on the right of the prior art, namely in the form of conventional profile rollers 40, 41 after FIG. 5a, b , which were arranged in the prior art on different levels or had to be summarized in different profile roller sets.

These prior art profiled rollers 40, 41 are aligned absolutely symmetrically with respect to the center 45, and the rotational offset angle 36 according to the invention, around which the asymmetrical profiled rollers 2 are provided, is missing certain angular extent of z. B. 3 ° with respect to a detained sheet metal part 1 twisted are arranged on the circumference.

For the same parts, the same reference numerals have been used, wherein in the FIG. 6 can be seen on the left side that 18 symmetrical side edges 32, 33 of the sheet metal part 1 are generated from the asymmetric flanks 20, 20a of the asymmetric roll collar.

The undeformed lateral surface 47 of the sheet metal part 1 is shown in dash-dotted lines.

The finished molded sheet metal part 1 is shown in solid lines, wherein the longitudinal groove 30 is shown with the symmetrically adjoining side edges 32, 33 with respect to the groove bottom 31.

The extrusion molding takes place in the asymmetrical profile roller 2 in the indicated direction of arrow 12, and it can be seen that it always runs simultaneously with the asymmetric roll collar 18 and the cylindrical forming surface having shoulder collar 19 and accomplished a corresponding flank formation.

The present invention is not directed to an asymmetric profile roll 2 according to

FIG. 5c limited. It is envisaged in a development that such profile rollers are also present multiple times, ie they form a multiple training a einstoffeinstückige or multi-piece multi-profiled profile role, the in FIG. 5c specified profile role 2 then, for example, twice. It can also be designed as a triple part, wherein all parts are material integral with each other.

In another embodiment, it may also be provided, the various parts of each in FIG. 5c also shown mechanically interconnect profile roll such. B. by mechanical or material connection means.

• Der Kalibrierring 3 besteht aus einer Anzahl von gleichmäßig am Umfang verteilt angeordneten Kalibrierzähnen 17, wobei jeder Kalibrierzahn 17 aus einem Zahnkopf 28 besteht, der konisch in den Pfeilrichtungen 12, 13 nach oben hin angeschrägt ist und ferner in einen sich daran anschließenden ebenfalls in den Pfeilrichtungen 12, 13 konisch zulaufenden Zahnfuß 29 übergeht.

In FIG. 7 is shown as an embodiment, the shape of a calibration ring 3, already in FIG. 3 was described and the in FIG. 8 is shown in plan view. The explanations regarding the Figures 3 . 7 and 8th as below:

• The calibration ring 3 consists of a number of evenly distributed around the circumference arranged Kalibrierzähnen 17, each calibration tooth 17 consists of a tooth head 28 which is tapered in the direction of arrows 12, 13 tapered upwards and also in an adjoining also in the arrow directions 12, 13 tapered tooth root 29 passes.

The tooth head 28 consists of a respective conically upwardly extending end edge 23 which is wedge-shaped and which has a certain angle in the form of an insertion bevel for insertion into the longitudinal groove 30 of the sheet metal part 1, wherein the double conical front edge 23 two lateral also connect double conical side edges 22.

In the same way, but only in an extended version, the tooth root 29 has a double-conical front edge 23a, which in turn is followed by double-conical side edges 22a.

Overall, thus forming tooth head 28, 29 each insertion bevels for the penetration of the longitudinal groove 30 of the sheet metal part 1, so as to provide a final calibration of the side edges 32, 33 in conjunction with the groove bottom 31 of the sheet metal part 1.

The calibration tooth 27 is recessed on a radius beam, in each case uniformly distributed on the circumference arranged calibration reason 27, each calibration base 27 in turn has an upper end edge 26, to which a lower end edge 26a connects.

These two end flanks 26, 26 a are inclined in the direction of arrows 12, 13, to form also an insertion bevel for the penetration into the longitudinal groove 30 of the sheet metal part first

In FIG. 8 the top view of the calibration ring 3 is shown, where the alternate arrangement of Kalibrierzähnen 17 is shown in conjunction with the subsequent Kalibriergrund 27.

On the outer circumference of the calibration ring 3, a circumferential lubrication groove 11 is formed, which is recessed in the cover-shaped material of the Kalibrierringes and via which a lubricant is introduced via grooves to lubricate the parts 17, 27.

The arrangement of the lubrication groove 11 in the region of an approximately plate-shaped calibration ring 3, there is the advantage that you can lubricate during the forming process, as for example in FIG. 2 is shown.

drawing Legend

1

sheet metal part

2

Profile roll asymmetric

3

calibrating

4

roll Dorn

5

admission

6

Lid down

7

backstop

8th

Recording above

9

frame

10

Top lid

11

lubrication groove

12

arrow

13

arrow

14

axle

15

direction of rotation

16

recess

17

Kalibrierzahn

18

roll Bund

19

shoulder Bund

20

Flank 20a (of 3)

21

22

Side flank (28) 22a

23

Face flank (28) 23a

24

25

26

Face flank (27) 26a

27

Kalibriergrund

28

addendum

29

tooth root

30

Longitudinal groove (from 1)

31

groove base

32

Side flank (from 1)

33

Side flank (from 1)

34

Radius line (from 1)

35

Radius line (from 2)

36

Rotary offset angle

37

Angle Y (from 20)

38

Angle X (from 20a)

39

Wall (from 1)

40

conventional profile roller

41

conventional profile roller

42

annular flange

43

deformation zone

44

Profile roller set

45

center

46

axle line

47

Lateral surface (from 1)

Claims (9)

1. Method for producing an internally and externally toothed pot-shaped sheet metal part (1), in which the untoothed pot-shaped sheet metal part (1) is pushed onto a mandrel (4) configured with an external tooth system corresponding to the internal tooth system, which is to be produced, of the sheet metal part (1) and then the external profile is rolled onto the pot-shaped sheet metal part (1), in that the pot-shaped sheet metal part (1) together with the mandrel (4) is pressed by a profiled roller set (44) rolling parallel to the centre axis (45) on the sheet metal part (1) with the exertion of a radial force, so the material of the sheet metal part (1) is pressed into the tooth grooves of the mandrel (4), a finished forming of the longitudinal grooves in the sheet metal part (1) taking place in a single method step in the course of a single pressing stroke, i.e. in an upward and downward movement of the mandrel (4), characterised in that the forming of the longitudinal grooves (3) is achieved by a single profiled roller set (44) with asymmetric profiled rollers (2), which is offset by a circular rotational offset angle (35) relative to a symmetrical radius line (34) of the sheet metal part (1).
2. Method according to claim 1, characterised in that a calibrating process additionally follows the final forming of the longitudinal grooves in the sheet metal part (1).
3. Method according to claim 1 or 2, characterised in that the calibrating process takes place during the upward and downward movement of the mandrel (4).
4. Device for producing an internally and externally toothed pot-shaped sheet metal part (1), in which the unformed sheet metal part (1) can be moved onto a mandrel (4), which is configured with an external tooth system corresponding to the internal tooth system, which is to be produced, of the sheet metal part (1), with a pressing tool movably driven in the longitudinal direction through a stationarily arranged profiled roller set (44), consisting of a large number of profiled rollers (2) arranged uniformly on the periphery, characterised in that the profiled rollers (2) form an asymmetric rolling periphery rolling the longitudinal groove in the sheet metal part and in that a circular relative rotational offset angle (36) is present between the profiled roller set (44) of the rolling forming tool and the sheet metal part (1).
5. Device according to claim 4, characterised in that the asymmetrical profiled roller (2) consists of a rolling collar (18) with an enlarged diameter, adjoined, on one side, by a flank (20a), which forms a first flank angle (38) (angle X), while the other side of the rolling collar (18) in the transition to a shoulder collar (19) cylindrically adjacent thereto, is adjoined by a second flank (20), which has a second flank angle Y (37) differing from the first flank angle (38).
6. Device according to claim 5, characterised in that the angle Y (37) of the flank (20) is smaller than the angle X (38) of the flank (20a), so an asymmetric engagement of the asymmetric rolling collar (18) occurs in the interior of the sheet metal part (1).
7. Device according to any one of claims 4 to 6, characterised in that the side flanks (32, 33) of the sheet metal part (1) are equally inclined and in that the asymmetric profiled rollers (2) in each case engaging therein have an asymmetric rolling collar (18).
8. Device according to any one of claims 1 to 7, characterised in that the rotational offset angle (36) is the angle, which is produced between the radius line (35) as the longitudinal line of symmetry through a profiled roller (2) at the point of intersection with the centre (45) of the rolling forming tool and from a radius line (34), which is the line of symmetry through the longitudinal groove (30) of the sheet metal part (1).
9. Device according to any one of claims 4 to 8, characterised in that the method according to one or more of claims 1 to 3 is carried out using the device.

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