EP0296317A2 - Method and device for bending a sheet metal - Google Patents

Abstract

The method described is a method for the curved bending of a metal sheet, especially an extruded thin aluminium section or roll-formed thin aluminium or steel sheet with a web and lateral flanges. In the method, the sheet is bent on one side on a feed table. <??>It is the object to provide a method which makes it possible to bend thin-walled and large-volume sections, avoiding buckling or tearing of the sheet and retaining an original initial profile. The intention is also to provide a dimensionally stable curved section. In addition, this bending method can be integrated into an already existing roll profiling support. <??>For this purpose, the sheet is rolled out between two horizontal pressing rolls in its web area, one side of the pressing rolls being assigned maximum rolling pressure while the other side is unpressurised, and the flange area of the sheet which is on the pressure side is rolled out in the manner of roll forming between two lateral pressing rolls. <IMAGE>

Description

The invention relates to a method for bending a sheet, in particular an extruded thin aluminum profile or roll-formed sheet with a web and side flanges with beads formed on the flanges, or other closed or open geometrically formed thin-walled small or large-volume profiles, in which the sheet or profile is bent on a feed table on one side and a device for performing the method.

The application of the invention relates to very large, thin-walled already pre-profiled sheets or profiles, in particular with beads in the web area and other complicated shapes on the flange parts, or also to difficult to bend pre-profiled sheets and profiles made of tough material with a larger cross-section. As a result, the sheets and profiles should have an arcuate bend in the support plane and in the flange area in the manner of a deformation by stretching on one side. In a further development of the invention, pre-bent metal sheets should additionally be given a curvature out of the support plane and a cone-like curvature should be given.

The application of the invention relates in particular to elongated aluminum profiles, which are initially unbent in the form of rails and consist of a central web with laterally angled flanges, with semi-circular beads pointing outward at the ends of the flanges being molded on by the manufacturer.

The beads are circular on one side of a flange with a smaller cross section in the manner of a spherical bead, and on the other flange a larger semicircular bead is formed in cross section on the outside in the manner of a hook.

Such elongated profiles are used to be hooked together, i.e. the larger hook-shaped bead engages over the smaller bead of the profile strand, so that such profile strands can be placed side by side in any width.

The larger hook-shaped bead is then crimped over the smaller bead, which creates larger contiguous profiled surfaces in a permanent connection, e.g. To cover roofs or the like.

The aim of the invention is to bend the initially straight, elongated profiled aluminum profiles with the flanges and the beads so that the corresponding spherical curvatures, for example in the case of any geometric shapes of roofs, in particular also spherical shapes or other spherical curvatures. of a roof to be covered.

However, what is particularly important here is that the original pre-profiles are to be retained by the bending method according to the invention.

Accordingly, the profile parts can still be hooked and flanged together on the originally intended flanges and the lateral beads even after the bending according to the invention in any complicated geometric shapes.

According to the invention, it is therefore possible, without the profile entering or being damaged by swellings or the like, to bend a rail-shaped profile with a U-shaped profile in cross-section with bulges pointing outwards in such a way that the previously straight rail is now initially viewed from above occupies an arcuate course in the support plane.

Furthermore, according to the invention, the rails are also in curved in the vertical direction, so that the rails additionally have a concave or convex course, without the other previous profiling, in particular beads, being affected.

According to the invention, the previously rectilinear and then circularly bent rail is now additionally bent in a vertical direction in an upward or downward direction, so that the curved rail additionally has a concave or convex shape.

In addition, in the case of the invention, a profile rail which is already bent under supervision and which additionally has a concave or convex profile is also additionally given a cone-shaped bend in the manner of a curve elevation.

Any geometric shapes, in particular roofs, can thus be reproduced for covering without the original profiling, which is provided as stiffening and / or for interlocking, being lost.

Rather, in the methods and devices according to the invention, original additional profiles are retained true to shape or are re-shaped according to the invention.

Accordingly, original pre-profiles are recorded from correspondingly profiled pairs of rollers, as a result of which the original pre-profiles are retained even during bending, or the pre-profiles e.g. the side beads are partially or fully bent before turning and bent back into their original shape by profiled pairs of rollers after the turning process.

The bending back into the original shape is easily possible, since in the invention the methods and devices are designed such that the parts to be bent later, for example the beads, are not distorted by the previous bending process, so that the original profiles can be easily reshaped after the bending in accordance with the invention.

So far, it was only possible to introduce corresponding beads or folds in the cross section of the profile to be deformed in order to achieve such spatial bending bodies, so that the upsets arising during the deformation process were absorbed by these beads.

So far it has not been possible to bend a large-volume profile according to FIGS. 7 or 12 and 12A. Up to now, only bending bodies according to FIGS. 10 and 11 could be produced by attaching corresponding beads in the center bar through the center bar perpendicular to the longitudinal center axis, and compressions were recorded by the beads when the center bar was curved.

However, the attachment of such beads is extremely expensive and, in addition, the water drainage in the case of such parts is impeded by the beads and also form considerable dirt traps. In addition, the cross-beaded profile loses its rigidity or resistance moment. In addition, a part with beads looks ugly.

In the present invention, a completely new path is therefore taken, where it was recognized for the first time that beads are not provided for accommodating such compression zones, but that the areas where the greatest deformation is necessary are stretched to such an extent that in connection with others Areas of the molded body in its cross-section is retained true to shape.

In the methods and devices according to the invention, a rail-like profile with a central web and two lateral flanges with beads is first bent in an arc by supervision without application of the bead area by applying a linear one increasing pressing force on the central web and by rolling out a side flange, whereby any pre-profiles or beads are not additionally rolled out.

Such a curved profile is additionally given a convex or concave curvature by roll bending or core roll bending machines with superimposed press rolls, the beads not being specially rolled out.

Another solution of the invention provides that, in order to bend a rail-like profile, the bead area is also overlaid with pressing pressure in order to achieve convex or concave curvatures, the beads being only partially or completely bent up and later being shaped back into the original shape.

With this solution, pressing forces are applied to achieve a convex or concave curvature of the rail, which may have already been bent under supervision, onto the central web, the lateral flanges and onto the beads, the beads, which were originally semi-circularly pre-profiled, before (during) the bending ( s) partially or completely bent by the intervention of pairs of rollers. The profile part is then bent convexly or concavely by applying linear pressing forces. Then the beads are bent back into their original shape by means of downstream profiled wheel sets which can move in the transverse direction, i.e. the partially or completely bent beads are closed again.

In the methods and devices according to the invention, it is therefore essential that, in addition to the rolling out of the lateral legs or flanges, the arcuate beads can also be rolled out very well without them being deformed or torn.

By additional linearly extending pressing forces on the central web and the flanges, an arcuate and otherwise concave or convex profile part are additionally conically deformed.

The invention is not only applicable to an aluminum profile with a web and side flanges, but also for other closed or open geometrically designed thin-walled profiles that do not necessarily have to have a web and two side flanges, these profiles can have a different size. If, instead of the profile described here, a closed profile is to be bent, then a solid core can be inserted, which has rollers in the bending region, in which rollers are then provided instead of the core, in order to bend a thin-walled, large-volume, closed profile.

In the known methods and devices, bending over a core was previously incomplete or not possible in the thin-walled and large-volume profiles described.

The object of the invention is to provide a method which enables the bending of thin-walled and large-volume profiles, bulging or tearing of the sheet is avoided and an original pre-profiling is to be obtained and a dimensionally stable, curved profile part is to be created. This bending process can also be integrated into an existing roll profiling pad.

The problem is solved with a method according to the characterizing features of claim 1. According to the invention, the characterizing features of claim 10 are provided for the device.

Accordingly, an initially straight-running rail-like profile with complicated pre-profiling on the flanges in the support plane, ie under supervision by means of press rollers, is bent in an arc shape by the features mentioned.

According to the characterizing features of claims 5 and 6, the arcuate profile in this way can additionally be bent out of the support plane, ie concave or convex.

In previous bending tests, attaching beads or folds could have caused the profile to bulge or warp, particularly in the stretching area. Up to now, deformations or swellings could easily occur in the upset area.

The invention now prevents or reduces the compressive forces generated by the pressure distribution according to the invention in the web area of the sheet and by rolling out the flange, so that a balanced force curve is created in the sheet metal part, i.e. a neutral line is created from which an increasing compressive force is applied.

From the outset, the invention avoids bending of the profiled sheet by applying extensive pressure, which could result in excessive compression forces with the formation of folds, but rather uses controlled thinning and thus stretching through rolling processes, in which smaller compression forces below the newly formed bending line are harmless can be distributed in the profile areas of the sheet.

The pressure profile of the two horizontal press rollers can be provided linearly for arcuate bends. This results in a shifting of compressive forces, in particular on the compressive side of the sheet, into sheet metal areas, which as a result lead to a stress-free profile part.

It is particularly important in the context of the invention that a tension-free or almost tension-free profile part is achieved, because the roll rolling bending according to the invention results in the material flowing cold in the forming area, as a result of which the tensions in the profile are largely eliminated and a largely tension-free profile part is thereby achieved becomes.

The pre-curved profile part can also be used in a further process step, especially with unstable and relatively weakly dimensioned profiles, recorded and rolled out stress-free in a controllable manner. This process can also be repeated.

The rolling out of the flange area of the sheet metal with two lateral pressure rollers can precede the rolling out of the web area, or can be connected in between. Here, the plate is carefully pre-stretched in its flange area with a force distribution that is favorable for the subsequent rolling process of the contact surface of the plate.

To roll out the flange area, several lateral pressure rollers can also be arranged in series. Also in later process steps, e.g. After the web of the sheet has already been partially rolled out, one or more pairs of lateral press rolls can be arranged.

The sheet or the profile part, in particular a Z-shaped profiled sheet metal part, can be arranged in its web and flange area between two horizontal press rolls in the manner of a four-roll bending machine, according to the invention starting from the lower, middle roll, a relatively large pressing force in the vertical direction against the for this purpose, the upper roll is exerted, whereby the otherwise known roll bending is combined with a roll bending.

The method is based on a four-roll bending machine known per se. There, the sheet is guided in a known manner between two middle guide rollers and is curved on the left and right of the lower rollers, which are symmetrically provided and are offset in height. The middle guide rollers serve only to generate a certain frictional force in order to convey and guide the sheet.

The invention now sees one at the lower middle roll considerable pressing force in the vertical direction against the opposite roller in the vertical direction, which surprisingly results in considerable technical advantages over roll bending.

What was previously only known as a normal bending process is now overlaid according to the invention with a rolling process using press rolls. The sheet is additionally given a curvature perpendicular to the pressing force for curvature in the roll bending method known per se. This means that a roll bending is combined with a roll roll bending, which results in a press roll bending process, which creates much more dimensionally stable molded parts by additional rolling.

The patent application is therefore directed to a method for roll-roll bending, with a roll-bending process with rolling out being added in its further embodiment, whereby a press-roll bending process is created. In this embodiment of the method in a four-roll bending machine known per se, the lower middle roll presses upwards with a vertical pressing force, as a result of which the bending profile is bent out of the neutral zone, i.e. Here, stretching forces are applied that support the normal bending process, so that the neutral zone is shifted inwards, so that the compression zone becomes smaller and the stretching zone becomes larger, so that the bending profile also assumes a concave or convex curvature in addition to the arched bend that is present anyway.

The surprising advantage is that relatively large-volume profiles with small cross sections can now be bent while avoiding deformations. So far this has not been possible.

Asymmetrical cross-sections can also be bent from material that is relatively thick-walled and difficult to bend, without having to fear deformations.

Usually this is reshaped into two roll bends, but it is disadvantageously results in twisting in the profile cross section. According to the invention, the stretching can now be artificially supported by the lower press roll, which surprisingly prevents deformations. The stretching corresponds approximately to the dimensions that would otherwise have been achieved by the normal bending process, but now without deformations.

In an embodiment of the patent request, which relates to a roll rolling process with only relatively thin-walled profiles, a press roll process is also superimposed here, which can be used with profiles that are difficult to bend.

Two or more horizontal press rolls can be overlaid with vibrations. With this arrangement, tough, solid material is advantageously deformed. The vibrations produce blows of low to very high frequency, which means that the deformation of the sheet is more effectively supported by the press rollers.

The vibrations can be provided on the upper horizontal press roller on the maximum press pressure side. In this case, there is an advantageous stress-free distribution of stretching and compression forces in the desired partial areas of the sheet.

One or more side press rolls can also be overlaid with vibrations. This also supports the effect of the side press rollers during the rolling process.

According to the characterizing features of claim 9, a device is provided according to the invention for carrying out the method, which device has press rollers with which the appropriate pressure distribution in the rolled-out area of the sheet is carried out according to the method.

A rolling process is created here, which can be adjusted both symmetrically and asymmetrically in order to achieve this adjustment to achieve correspondingly different radii. The web of the sheet and its outer flange area on the long side of the profile are stretched.

The horizontal and lateral press rolls can have profiles. As a result, the pre-profiling of the sheet is advantageously not violated when it is rolled out.

The upper horizontal press rollers have pressure rollers at their shaft ends, which are arranged vertically displaceably in a bearing via a spindle drive. With this arrangement, a desired pressing or rolling pressure can advantageously be preselected differently for the various horizontal press rolls.

The lower press rollers can be supported on their circumference on pressure rollers. As a result, the axes of the lower press rollers are advantageously relieved and can therefore serve for the progressive movement of the sheet metal to be bent via a drive.

One side press roller can be arranged stationary, while the other side press roller is provided on an arm with a spindle drive. Here, a selectable pressing force is advantageously set on the lateral pressing rollers.

A motorized drive with a drive chain or the like can be provided in the area of the lower horizontal press rolls. The drive advantageously ensures that the bending process continues smoothly.

In the previous embodiments of the invention, the outward-pointing beads of the flanges are only bent without further action in the course of the bending of the web and the flange area, which means that there is a risk that the beads only imperfectly follow the other turns and the subsequent fit may be endangered can.

In a continuation of the invention, the arcuate beads are now also rolled out in accordance with the other bends in the profile without the original fit which is necessary to hook the profile parts after the bend being lost.

In this case, horizontal press rolls in the web area and lateral press rolls on the flanges are provided in upstream or downstream in order to bend the sheet in an arc, and for bending, the almost circular beads, which have been formed on the profile from the outset, are either partially semicircular or completely in order to bend bent up in a straight line and overlaid with pressing forces.

After the pressing and bending processes, the beads are then deformed back into their original shape.

Accordingly, in the case of arcuate bends of the sheet and / or in the case of convex or concave curvatures of the sheet, the previously circular beads are partially bent up and for convex curvature of the sheet, linearly increasing pressing forces are provided on the flanges on the left and right, starting from the web area, and on the Beaded linear pressure forces are applied.

For concave curvatures, it is provided that the beads are partially bent in a semicircular shape and that for the concave curvature of the sheet on the flanges on the left and right, starting from the beads and on the beads themselves, linearly increasing pressing forces are provided in the outer and inner areas and that linearly increasing arc-shaped pressing forces are applied in the transition to the web area and, furthermore, a uniform rolling pressure is applied to the center web.

In order to achieve concave or convex curvatures of the sheet metal when the beads are straight and flanged, it is provided that linearly increasing or linearly decreasing pressing forces act on the flanges and the bent-up beads on the left and right in each case, starting from the web area, in conjunction with a uniform pressing force on the central web.

For a conical bending of the curved profile in the manner of a curve elevation, it is provided that a linearly increasing pressing force is formed in the web area in the direction of the bend and that linearly increasing, arc-shaped pressing forces are provided at the transition areas to the flanges and that the flanges in the direction attack linearly falling pressing forces towards the beads.

A device for arcuate bending of the profile and for curving the shaped profile parts provides that pairs of pressing and bending rollers are arranged one behind the other for a passage of the sheet to be bent, one or more pairs of rollers for opening the beads, one or more pairs of bending rollers for rolling out the beads , one or more pairs of lateral press rollers for rolling out the flanges, at least one pair of press rollers with bending rollers for the central web and three pairs of rollers for closing the beads are provided, as well as for the horizontal bending of upstream or downstream horizontal pressing rollers and further lateral pressing rollers on the flanges of the sheet to be bent .

The invention is explained in more detail below with the aid of drawings which illustrate only one embodiment. Further features and advantages of the invention which are essential to the invention emerge from the drawings and their description.

The subject matter of the present invention results not only from the subject matter of the individual patent claims, but also from the combination of the individual patent claims with one another. All information and features disclosed in the documents, in particular the spatial training shown in the drawings are considered claimed according to the invention insofar as they are new compared to the prior art, individually or in combination.

• Figur 1 den Querschnitt eines profilierten Bleches mit Darstellung von Spannungsfeldern,
• Figur 2: die stirnseitige Ansicht einer Biegevorrichtung in schematischer Darstellung, teilweise geschnitten mit Darstellung des Bleches 5 und horizontalen und seitlichen Preßrollen,
• Figur 3: eine Seitenansicht nach Figur 2 in schematischer Darstellung, teilweise geschnitten,
• Figur 4: eine seitliche schematische Darstellung der Biegevorrichtung mit paarweise hintereinander angeordneten horizontalen Preßrollen,
• Figur 5: eine schematische Darstellung einer Vierrollenbiegemaschine,
• Figur 6: eine schematische Darstellung zur Anwendung eines zusätzlichen Preßrollganges bei einer Vierrollenbiegemaschine nach Figur 5,
• Figur 7: die Aufsicht auf ein großvolumiges Blech mit Krümmungen gemäß einem Rollwalzbiegeverfahren,
• Figur 8: eine stirnseitige Schnittdarstellung nach Figur 7,
• Figur 9: einen Längsschnitt nach Figur 8 mit Darstellung einer zusätzlichen konkaven Krümmung gemäß einer Überlagerung des Rollwalzbiegeverfahrens mit einem Preßrollvorgang,
• Figur 10 ein profiliertes Blech mit angeformter konvexer Krümmung durch zusätzliches Auswalzen der Wulste und der Flansche;
• Figur 10A das profilierte Blech nach Figur 10 im Querschnitt,
• Figur 11 ein profiliertes Blech mit angeformter konkaver Krümmung durch zusätzliches Auswalzen der Wulste und der Flansche in einer anderen Preßrichtung,
• Figur 11a das profilierte Blech nach Figur 11 im Querschnitt;
• Figur 12 ein kreisförmig abgebogenes sowie konvex gekrümmtes und zusätzlich konisch abgebogenes profiliertes Blech in der Aufsicht;
• Figur 12A das profilierte Blech nach Figur 12 in einer perspektivischen Darstellung;
• Figur 13 der Verlauf der Preßkräfte spiegelbildlich zu einer Mittenachse, um konvexe Krümmungen nach Figur 10 oder konkave Krümmungen nach Figur 11 zu erzielen;
• Figur 14 der Verlauf der Preßkräfte, um konvexe Verformungen nach Figur 10 bei aufgebogenen Wulsten zu erzielen,
• Figur 15 ein Spannungsdiagramm der Preßkräfte, um ein profiliertes Blech nach Figur 10 oder Figur 11 zusätzlich konisch zu verformen;
• Figur 16 die Anordnung von Rollenpaaren für die Wulstverformung.

It shows:

• FIG. 1 shows the cross section of a profiled sheet with the representation of stress fields,
• FIG. 2: the front view of a bending device in a schematic representation, partially cut with representation of the sheet 5 and horizontal and lateral press rolls,
• FIG. 3: a side view according to FIG. 2 in a schematic illustration, partly in section,
• FIG. 4: a lateral schematic representation of the bending device with horizontal press rolls arranged in pairs one behind the other,
• FIG. 5: a schematic representation of a four-roll bending machine,
• FIG. 6: a schematic illustration of the use of an additional press roller table in a four-roller bending machine according to FIG. 5,
• FIG. 7: the top view of a large-volume sheet with curvatures in accordance with a roll-roll bending process,
• FIG. 8: an end sectional view according to FIG. 7,
• FIG. 9: a longitudinal section according to FIG. 8 showing an additional concave curvature according to an overlay of the roll-roll bending process with a press-rolling process,
• FIG. 10 shows a profiled sheet metal with a formed convex curvature by additionally rolling out the beads and the flanges;
• 10A shows the profiled sheet according to FIG. 10 in cross section,
• FIG. 11 shows a profiled sheet metal with a formed concave curvature by additionally rolling out the beads and the flanges in a different pressing direction,
• Figure 11a shows the profiled sheet according to Figure 11 in cross section;
• FIG. 12 is a top view of a circularly bent and convexly curved and additionally conically bent profiled sheet;
• FIG. 12A shows the profiled sheet according to FIG. 12 in a perspective illustration;
• FIG. 13 shows the course of the pressing forces in mirror image to a central axis in order to achieve convex curvatures according to FIG. 10 or concave curvatures according to FIG. 11;
• 14 shows the course of the pressing forces in order to achieve convex deformations according to FIG.
• FIG. 15 shows a stress diagram of the pressing forces in order to additionally conically deform a profiled sheet according to FIG. 10 or FIG. 11;
• Figure 16 shows the arrangement of pairs of rollers for bead deformation.

1 shows a profiled sheet metal 5 with a web area 11 and lateral flanges 9, 10. Essentially, the first step is to bend the profiled sheet 5 according to a radius 33 according to FIG. 1. A distribution of forces depending on the dimensions of the sheet is plotted over the profiled sheet 5. The dashed line of forces shows stress fields in the area of the profile, which were achieved with the known bending processes.

Starting from a neutral course, for example in the area of the web center of the plate 5, stretching forces above the profile have been achieved so far by pressure task when bending, which were opposed by considerable compression forces below the plate 5. This resulted in loads on the profile or sheet 5, which resulted in the profile bulging or tearing, and in some cases caused irreversible deformations.

A counterforce 34 in the manner of a distribution of forces is now applied to the vertical leg 9 of FIG. 1 to indicate that a counterforce 34 acts from the outside in the direction of the central longitudinal axis in the region of the entire vertical leg 9, which acts from the inside of the leg 9 there is an equal force distribution - acting towards the outside. The hatched rectangle with the counterforce 34 symbolizes that the same force acts on the vertical leg 9 from the outside as from the inside in order to avoid an inadmissible deformation of this vertical leg 9.

By means of the method according to the invention in connection with the device by applying unilateral rolling forces, it has now been possible to shift the neutral line shown in broken lines in FIG. 1 into a force curve 56 shown in solid lines in FIG. As a result, large stretching forces are achieved, with the result that uncontrollable compression forces are avoided, particularly on the underside of the profile.

According to the invention, a maximum pressing pressure is applied in position 18 of the plate 5, where the greatest radius of curvature is to be achieved, by horizontal pressing rollers, which preferably merges linearly into an unpressurized area in position 17 on the other side of the plate 5.

Then or even beforehand, the lateral flange region 9 of the sheet 5 is corresponding to the greatest radius of curvature by lateral Rolled out press rolls. The sheet 5 can also be exposed to this course of forces in repeated passes. The beads 52 are not rolled out in this process, but are only bent in the course of the entire deformation of the sheet 5.

The total force curve achieved according to Figure 1 above the sheet 5, by rolling out the web to different degrees and laterally rolling out the flange 9, leads to a desired circular bending of sheet 5 corresponding to a lateral bending in the plane of the drawing according to Figure 1, as is similar with rail profiles of Case is.

The method according to the invention, the combination of a bending process with a roll forming process, here called a press roll bending process, prevents the thin sheet metal profile 5 from bulging and, as a result, achieves a stably curved molded part.

Due to the linear course of the pressing over the web 11 of the sheet 5, starting from a maximum pressing force at position 18 to a pressure-free course in the area of the web 11 at position 17, undesirable upsetting forces are intercepted and rather continuous pressing forces are generated which bring about the desired curvature .

Following a bending pass, the bending or rolling process can be repeated both on the web 11 of the sheet 5 itself and on the flange area 9 of the sheet 5 with different pressing forces.

The method according to the invention is particularly well suited for upstream or downstream connection in known core roll bending machines or three-roll bending machines, where the sheet is additionally curved in the vertical direction, since the invention additionally achieves pre- or post-processing of the sheet 5, which results in a stable, wave-free curvature leads.

According to the invention, in particular in the case of tough, solid materials in the area of position 18 according to FIG. 1, the pressing pressure is superimposed with a vibration. With the intended linear distribution of the pressing pressure over the web region 11 of the sheet 5, this leads to support in the stretching and compression processes.

The rolling pressure in the flange area 9 of the sheet 5 can also be superimposed with vibrations in order to support the stretching process in the form of adjustable frequency beats.

In Figure 2, the sheet 5 is shown with its web 11 and the flanges 9 and 10 in the pressing position between two horizontal press rollers 4 and 6, the maximum pressing pressure being present in position 18, which is linear up to a depressurized state in position 17 in the region of Sheet 5 runs.

On the flanges 9 and 10 are supported in waves on the inside of lateral pressure rollers 19, which are opposed on the outside of the flanges 9 and 10 lateral pressure rollers 21.

According to the illustration in FIG. 1, a maximum pressing pressure corresponding to a desired extension is generated by the lateral pressing rollers 19, 21 in the region of the flange 9. The pressure rollers 19, 21 on the flange side 10 of the sheet 5 run without pressure, so that the profile is bent in a circle.

The horizontal press rollers 6 have profiles, in particular annular grooves 7, so that pre-profiled beads 8 in the region of the web 11 are not damaged when they are rolled out.

Profiles are also provided on the lateral pressure rollers 19, 21 in order to be able to carry out the rolling process in the flange regions 9 and 10 without damaging existing beads 52.

In order to achieve the vertical pressing pressure of the horizontal pressing rollers 6, these are mounted at their shaft ends 12 via a bearing seat 13 on pressure rollers 14, to which a spindle pressure in the direction of the arrow 29 is applied via bearings 15. The bearing 15 with the pressure rollers 14 is vertically displaceable in the direction of arrow 16.

To achieve the lateral rolling pressure, e.g. on the flange 9, the lateral pressure roller 21 is provided horizontally displaceable, the flange forming pressure acting in the direction of arrow 22. For this purpose, the press roller 21 is mounted on an arm 23 according to FIGS. 2 and 3, to which the spindle pressure from a spindle, not shown here, is applied in the direction of the arrow 24.

To relieve the axis 3 of the lower horizontal press rollers 4, 2 pressure rollers 1 are provided on a shaft, on which the horizontal press roller 4 rests.

Figure 3 shows the bearing arrangement of the horizontal press rollers 4,6 from the side. The plate 5 is located between the two horizontal press rolls 4 and 6, which have the maximum press pressure in position 18.
In the invention it is important according to Figure 3 that the peripheral speed of the rollers 4 and 6 is exactly the same. This can either be achieved in that only the roller 4 is driven alone, as shown in FIG. 4 and the roller 6 then only moves along, or it can also be provided that both the roller 4 and the roller 6 are in synchronism are driven and have the same diameter or that they have different diameters, but are then driven so that they have the same rotational speed on the outer circumference.

The bearings 15 are slidably mounted in guides 32, the spindle pressure acting in the direction of arrow 29 via the pressure rollers 14 on the shaft end 12 of the upper horizontal press roller 6 and the Pressing pressure generated. The lower horizontal press roll 4 is immovably arranged only rotatably and takes up the press pressure via the press rolls 1.

FIG. 4 shows an arrangement of the horizontal and lateral rolling process, the sheet metal 5 first passing two horizontal press rollers 4, 6 in the direction of the arrow 30 via a motor drive with a drive chain 27, which are followed by a deformation of the flange area by means of the lateral press rollers 21.

In a further continuation of the sheet 5 in the direction of the arrow 30, a further rolling out of the web 11 of the sheet 5 with additional horizontal press rollers 4, 6 is provided. The sheet 5 is advantageously guided over loose rollers 25.

FIG. 4 shows the side of the sheet 5 with the web 10, which according to FIG. 1 has a largely pressure-free course with the position 17. The roller 21 is used here in connection with pressure-free ends of the horizontal press rolls 4, 6 only for guiding the sheet 5.

Maximum pressure conditions prevail on the side of the sheet metal 5 with the flange side 9 opposite the flange side 10.

The device is created in a symmetrical arrangement. Depending on the desired curvature of the sheet 5, pressure increases can also be provided in the otherwise depressurized areas of the device. With the curvatures to be expected, the press rolls 4, 6 are arranged offset according to the course of the curvature.

According to FIG. 4, three different forming processes are connected in series, namely by means of the first bending station, which lies at the front in the direction of arrow 30, the web 11 is first rolled and slightly curved. The forming process then closes Flange areas on by the central arrangement of the laterally acting press rolls 21 and then the actual finish press rolling takes place through the station connected in the direction of arrow 30, where the horizontally mounted rolls 4, 6 are also opposite one another.

However, any other embodiments are also possible. In this way, more than two forming stations can be used for the web or several flange forming stations.

In Figure 4, the spindle drives 31 can be seen, which generate the vertical pressing pressure via the vertically displaceable press rollers 6. For the lateral rolling out of the flange regions of the sheet 5, lateral pressure rollers 21 are provided on an arm 23, on which the spindle pressure acts in the direction of the arrow 24.

To support the rolling processes, vibrations can be provided on the arm 23 in the direction of the arrow 24 and in the region of the spindle drive 31 on the horizontal press rollers 6 with adjustable frequency.

FIG. 5 shows a four-roll bending machine known per se, in which the profiled sheet metal part 5 is guided between two middle rolls 35, 36 only via frictional forces. Two further rollers 37, 38 only serve to give the sheet metal part 5 a curvature according to a radius 39 in a manner known per se.

In an embodiment of the patent request, it is now provided according to the invention that a considerable pressing force 40 is exerted on the central roller 36 in the vertical direction, which additionally creates a concave curvature of the sheet metal part 5. This means that a press roll is superimposed on the roll bending, so that overall a press roll bending is produced, which surprisingly offers advantages, in particular the stress-free curvature of difficult, difficult to bend, relatively thick-walled profiles. For convex curvatures the order is changed Figure 5 used with bending rollers 37,38 acting from above.

The use of such a press roll bending method is shown in FIG. A Z-profile 41 is located between pressure rollers 35, 36, a relatively large pressing force 40 being applied in the vertical direction. As a result, a neutral line 42, which is otherwise present during the roll bending process, shifts into an innocuous area in accordance with a resulting neutral line 43. Bending forces 44, 45 which otherwise have an effect are eliminated and, rather, a bending force 46 acting in the direction of the horizontal leg is created, as a result of which damaging deformations are avoided.

During roll bending, the leg 47 could bend in an arc at an angle according to the force 45, which is now avoided since the stretching process results in uniform stretching, which compensates for deformations. Rather, a uniform tension is achieved over the entire horizontal leg 47. The press-rolling process here provides for an artificial stretching of the web or of the horizontal leg 47, so that, as it were, an artificial bending process occurs in which deformations are surprisingly avoided.

The patent application relating to roll rolling bending according to FIGS. 1 and 2 is continued here in such a way that a press roll according to FIGS. 5 and 6 is also integrated into this roll rolling bending, as a result of which press roll bending is produced.

The pressing force 40 extends uniformly over the entire length of the horizontal leg 47, which means that profiles 41 which are difficult to bend can now be bent.

FIG. 7 shows a profile part 5 with beads 52 which, according to the invention, was bent in a roll-rolling bending process according to FIG. 1 according to the patent request according to radii 48, 49. Such profile parts 5 can have considerable dimensions and dimensions of several meters.

FIG. 8 shows the profile part in an end sectional view, it being evident that the profile with beads 52 is present in a profile that is relatively difficult to bend.

FIG. 9 shows radii 50, 51 which were given to the profile part 5 in an additional press rolling operation according to FIG. 5, 6. This means that, according to the invention, large thin-walled sheets 5 or sheets of tough material that are difficult to bend can now be provided both with radii 48, 49 according to FIGS. 2, 3, 4 and 7 and with radii 50, 51 according to FIGS Figures 5,6 and 9.

According to FIGS. 10 to 14 in conjunction with FIG. 16, it is explained how, in addition to a desired bending and curvature of the sheet 5 according to FIGS. 1 to 9, the beads 52 are also deformed according to the invention in order to achieve a desired fit and in addition the stability of the deformed sheet 5 to increase.

According to FIG. 16, it can be seen how the bead 52 is rolled out over pairs of rollers 69, 71 in order to also suitably curve the bead area in this way.

Accordingly, according to FIGS. 10 to 14 and FIG. 16, the beads 52 are rolled out from the inside and outside and partially bent up (drawn in with a solid line) or the beads 52 'are bent up completely (shown in dashed lines) in an upstream station (not shown) in FIG. After bending and curving the bead area in connection with bending and curving the central web and the flanges according to FIGS. 1 to 9, the beads are formed in a circular or hook-shaped manner in the original shape, whereby deformation or tearing of the beads is avoided in particular.

According to the tension diagrams in FIG. 13 and FIG. 14, a profiled sheet 5 according to FIGS. 10 and 11 is created, where the profiled sheet 5 with the flanges and the beads 52 has a convex curvature with the radius 53 in the web area 11 or according to FIG. 11 has a concave curvature with the radius 54 and each additionally takes an arcuate course according to FIG. 7.

The curvatures 53, 54 are achieved with a roll bending process, on which a press-rolling process is superimposed, on the central web 11 according to FIG. 5, the flanges 9 and 10 with lateral press rolls 19, 21 according to FIG. 2 also being rolled out in the manner of a press roll rolling bending process and additionally 16, the beads 52 in connection with roller pairs 69, 71 are placed under pressing pressure, as a result of which overall pressure profiles of the pressing forces according to FIGS. 13 and 14 are produced.

FIGS. 10A, 11A each show the cross section of the profile. It is essential here that there is a neutral bending axis 55, which runs largely stress-free.

A further exemplary embodiment is shown in FIGS. 12, 12A, where the profile additionally has a conicity at an angle 78, that is to say that one flange 9 is higher than the other flange 10. If one looks at the profile according to FIG. 12 and FIG 12A is presented as a circular ring, this results in a cone that narrows towards the center.

This conical course of curvature is achieved with pairs of rollers in accordance with a tension diagram according to FIG.

After the invention has been continued, it is now possible not only to achieve a bending structure according to FIG. 7, but also to be able to achieve the most varied bending shapes in combination or on their own from FIGS. 10 to 12.

The tension diagrams in FIGS. 13, 14 and FIG. 15 show the course of the pressing pressure of the roller pairs arranged one behind the other according to the devices according to FIGS. 4, 5, 6 and 16, when the previously linearly profiled sheet 5 passes through the pressing and Bending rolls are bent and curved without opening and closing stations for the beads 52 or other guide rollers being shown here.

According to FIG. 13, the course of forces 34, 56 can first be seen, as is achieved according to FIG. 1 with a device according to FIG. 4, as a result of which the sheet metal 5 is bent in an arcuate manner according to FIG.

In order to achieve a convex curvature of the sheet 5 according to FIG. 10, the tension diagram relating to the flange 9 and the bead 52 is now shown according to the right part of FIG. 13. For convex curvatures, the same voltage diagram for flange 9 applies to the flange 10 as a mirror image of the central axis 62, which for the sake of simplicity is shown here only for one flange in FIGS. 13 and 14.

Accordingly, with lateral pressure rollers 19, 21 for convex curvatures, the flanges 9, 10 are given a pressing force 57 which initially increases linearly from the center web 11, but which at point 58 at the level of the beads 52 changes into a non-linear pressing force 59 which extends to the apex 60 weakly rises to a maximum pressing force and then weakly falls again in the outer region of the bead 52 according to FIG. 13 at point 61.

This tension diagram with the linear and non-linear press forces 57, 59 is achieved on the flanges 9, 10 by means of lateral press rolls 19, 21 in accordance with FIG. 2 and on the beads 52 by means of profiled roller pairs 69, 71 in accordance with FIG. 16, the respective press rolls or Roles are upstream or downstream of each other.

On the left hand side according to FIG. 13 there is a flange 10, a bead 52 and a web 11 shows a stress curve in order to curve the sheet metal 5 concavely according to FIG. 11, the same stress diagram applying to the flange 9 in mirror image.

Accordingly, a maximum pressing force 63 is first applied to the flanges 9, 10 by means of pressing rollers 19, 21, which drops linearly corresponding to the pressing force 65 to the zero point 64 of a zero line 66 on the bead 52.

On both sides of the bead 52, a slightly increasing outward and inward pressing force 7, 68 is applied by means of the differently adjusted and possibly swiveled roller pairs 69, 71 according to FIG. 16.

In FIG. 5, an upward or downstream inclined pressing roller 19, 21 applies a pressing force 70 which increases slightly in a curved, linear manner in the region of curvature between the flanges 9, 10 and the central web 11.

Furthermore, for convex curvatures in a further station according to FIG. 5, an additional pressing force 40 is given to the central web 11 in the reverse bending direction in connection with a press roll bending process in order to concave the central web 11.

For convex curvatures, the bending direction is reversed according to Figure 5.

In the tension diagram according to FIG. 13 in order to achieve convex or concave additional curvatures according to FIG. 10 or FIG. 11, the beads 52, which according to FIG. 2 originally exist as a ball or hooked bead from the manufacturer's side, are slightly bent up as shown in FIG. 16.

The roller pairs 69, 71 have profiles 72, 73, by means of which the tension profiles on the beads 52 according to FIG. 13 left or right part are achieved by pivoting and pressing.

The roller pairs 69, 71 with intrinsically complicated profiles could, however, also be omitted.

In an upstream station, lateral rollers (not shown here), for example according to the press rollers 19, 21 according to FIG. 2 with suitable profiling for flanging, flare the originally semicircular beads 52 in a straight line according to beads 52 'in the dashed representation according to FIG. 16.

With such beads 52 'running in a straight line with the flanges 9, 10, the sheet 5 can now also be concavely or convexly curved according to FIG. 14.

According to FIG. 14, a pressing force 74, which increases linearly from the central web 11, is applied to the flanges 9, 10 by means of lateral, non-profiled press rolls, for example according to the press rolls 19, 21 according to FIG. 2, in a station downstream of the flanging process. 10 and the beads 52 '.

For concave curvatures, the course of the pressing forces 74, 40 according to FIG. 14 is reversed.

The curvature profile of the pressing forces 34, 56 according to FIG. 13 and FIG. 14 is connected to an arcuate bending of the sheet metal 5 in a upstream or downstream bending and rolling station according to FIG. 4.

After the convex or concave curvature of the sheet 5 according to FIGS. 13 and 14, the partially bent bead 52 or the fully bent bead 52 'is returned to the original shape, for example after, in a closing station which is arranged at the end of the run and is not shown here Figure 15, bent back.

When comparing the pressing force diagrams of FIG. 13 and FIG. 14, it can be seen that both shapes of the bead 52 either partially bent or completely bent have their advantages. From the illustration on the right in FIG. 13 it follows that if the bead 52 is not bent up particularly then a pressing force acts at the apex 60 which is smaller than the pressing force according to FIG. 14 at the end of the bead 52 ', i.e. So that after bending the beads relatively high pressing forces are applied, but profiled pairs of rollers 69, 71 are avoided.

In engineering terms, the partial or complete bending of the beads 52 is carried out in a plurality of bending stations connected in series, pairs of rollers 60, 71 according to FIG. 16 being arranged such that e.g. In an upstream first bending station, the beads 52 are partially bent into the position of the bead according to FIG. 16 (solid lines), after which a pressing force 40 is then applied to the central web 11 in a further bending station, and overall a molded body according to FIGS. 10 or 11 is created and then the bead 52 is closed again with corresponding shaping rollers in a downstream third station, so that the bead 52 reaches its original shape.

The same constructive solution is also achieved with a bead 52 'which has just been rolled out, so that the initially straight profile part with beads passes through a first station, where the bead is being rolled out to beads 52' and then in a middle station the profile with the flanges 9 , 10 is rolled out into an arcuate body according to FIG. 10 or FIG. 11 corresponding to FIG. 14 with the pressing forces 40, 74 and later the bent bead is closed again with corresponding shaping rollers in a downstream station.

Using FIG. 15, a pressure force diagram is used to explain how a conically shaped body according to FIG. 12 and FIG. 12A is produced.

According to FIG. 15 there are initially three bending radii 75, 76, 77 and the profile has a cone angle 78 with respect to the horizontal.

The bending curve of the beads 52 is not shown in FIG. 15 because there is a course according to FIG. 13.

For the conical deformation of the profile, a radius 77 is defined on the right bead 52, where a zero point 79 is present, from which the pressing force increases in the form of the linear curve 80 up to a vertex 81, which lies in the plane of the center leg 11 . In order to be able to roll out the radius in the transition between the flange 9 and the center leg 11, a pressing force corresponding to the arc curve 82 is provided, which extends to the point 83, which lies in the plane of the flange 9. It is now important that a certain pressing force 84 already exists here and that the pressing force 84 increases from position 83 in the form of the linear curve 85 to position 86, where the pressing force 87 is maximum.

At the transition between the center leg 11 and the flange 10, the pressing force again follows the radius 76, i.e. it follows the arcuate pressing force 88 in order to then extend to the apex 89, which lies in the plane of the center leg 11.

With this method it is now very important that this conical body can be obtained at all without the flanges 9, 10 being deformed during the bending, that from point 89 the pressing force to point 90 (over the length of the flanges 10) decreases linearly and here follows the linear curve 91, corresponding to the radius 75 allow the pressing force 91 to rise linearly instead of dropping, then the flange 10 would additionally bend uncontrollably.

In this respect, it is important that an XZ axis is provided and the position is determined from this plane by a on the inner radius 77 Zero point 79 is formed, and the more one goes out of this zero point 79 from the XZ axis, the more one has to stretch and roll out in order to obtain a corresponding deformation.

Therefore at radius 76, i.e. the largest radius, the greatest deformation is also necessary, and in the case of radius 75, a smaller deformation is necessary in accordance with the smaller radius, which results in the decrease in the pressing force in the form of the linear curve 91.

The method according to the present invention is thus characterized in that a profile can be brought into different geometric positions by applying different pressing forces to the shaping rollers by using different shaping rollers.

It is essential in the invention that the original cross section of the profiled sheet 5 according to FIG. 15 is always true to shape or can be molded on during all bending operations and after the passage, and the balls or hook beads 52, so that the molded parts can be made without further ado Reworking could be connected to one another, whereby according to the invention there are no material weakenings or tears and deformations of the type of folds to be feared.

If it turns out that delivered cross sections in the area of beads or other closed profile cross sections with form rollers are difficult or impossible to achieve, then in a further development of the present invention the beads or closed profile cross sections are partially or fully opened in order to carry out the press rolling process in order to to achieve a controlled deformation in this way and only then are the bent parts closed again in downstream stations, ie returned to its original form.

So far, these methods and devices have not been used, Rather, it was bent around cores or beads were inserted or folds were created when turning, which were more or less smoothed out again.

With the present invention, it is possible for the first time that even complex pre-profiles such as beads are retained true to shape, so that even after the production of any spherically deformed metal profiles, these can easily be placed next to one another and connected to one another on the beads now obtained.

In this respect, any geometric shapes for covering roofs or the like can be produced in a fixed connection. This method can also be used to produce sheets with straight ends, depending on the arrangement of the press-roll bending rollers and the profiling roller systems with respect to one another.

DRAWING LEGEND

1 pressure roller
2 wave
3 axis
4 horiz. Press roll
5 sheet
6 horiz. Press roll
7 ring grooves
8 beads
9 flange areas
10 flange areas
11 dock area
12 shaft end
13 inventory
14 pressure rollers
15 bearings
16 arrow direction
17 position
18 position
19 pages Press rolls
20 bearing axles
21 pages Press rolls
22 arrow direction
23 arm
24 arrow direction
25 start rolling
27 drive chain
29 arrow direction
30 arrow direction
31 spindle drive
32 leadership
33 radius
34 drag
35 medium roles
36
37 more roles
38
39 radius
40 pressing force
41 Z profile
42 neutral line
43 neutral line
44 bending forces
45 bending forces
46 bending force
47 legs
48 radii
49
50 radii
51
52 beads
53 radius
54 radius
55 neutral bending axis
56 Course of forces
57 pressing force
58 point
59 pressing force
60 vertex
61 point
62 longitudinal center axis
63 maximum pressing force
64 zero point
65 pressing force
66 zero line
67 pressing force
68 pressing force
69 pair of rollers
70 arc-shaped pressing force
71 pair of rollers
72 profiles
73 profiles
74 design pressing force
75 bending radii
76 bending radii
77 bending radii
78 angles
79 zero point
80 linear curve
81 vertex
82 arc curve
84 pressing force
85 linear curve
86 position
87 pressing force
88 arcuate pressing force
89 vertex
90 point
91 linear curve

Claims (20)

1. A process for the arcuate bending of a sheet, in particular an extruded thin aluminum profile or roll-formed thin aluminum or steel sheet with a web and side flanges, in which the sheet is bent on one side on a feed table, characterized in that the sheet (5) is rolled out in its web area (11) between two horizontal press rolls (4,6), one side of the press rolls (6) being assigned maximum rolling pressure, while the other side is depressurized and the flange area (9) on the pressure side the sheet (5) is rolled out in the manner of roll forming between two lateral press rolls (19, 21). 2. The method according to claim 1, characterized in that the pressure profile of the two horizontal press rollers (4, 6) is provided linearly. 3. The method according to claim 1, characterized in that two further or in pairs several horizontal press rollers (4,6) are provided after the bending process, with a maximum - possibly different - pressing pressure on the bending side of the sheet (5) and an unpressurized other side of the press rolls. 4. The method according to claim 1, characterized in that the rolling out of the flange region (9, 10) of the sheet metal (5) with two lateral pressure rollers (19, 21) precedes the rolling out of the web region (11), is connected in series or in between. 5. The method according to claim 1, characterized in that known core roll bending machines or tri-roll bending machines or four-roll bending machines, the horizontal press rolls (4,6) and the lateral press rolls (19,21) are connected upstream or downstream or integrated. 6. The method according to claim 1, characterized in that the sheet (5) or the profile part in its web and / or flange area between two horizontal press rolls (35,36) and in the manner of a four-roll bending machine in the area of further bending rolls (37,38 ) is arranged, starting from the lower middle roller (36) a relatively large pressing force (40) is provided in the vertical direction against the upper roller (35) (Figure 5,6). 7. The method according to claims 1 to 5, characterized in that the two horizontal press rollers (4,6,35,36) are superimposed with vibrations. 8. The method according to claim 6, characterized in that the vibrations on the upper, horizontal press roller (6) are provided on the side of the maximum press pressure. 9. The method according to claims 1 to 5, characterized in that a lateral pressure roller (21) is superimposed with vibrations. 10. Apparatus for carrying out the method, characterized in that lower fixed horizontal press rollers (4) and upper vertically displaceable press rollers (6) are provided on the web area (11) of the sheet (5) and lateral on the flange area (9, 10) of the sheet Press rolls (19, 21) are arranged. 11. The device according to claim 9, characterized in that the horizontal and lateral press rollers (4,6,19,21,35,36) have profiles. 12. The apparatus according to claim 9, characterized in that the horizontal press rollers (6) have at their shaft ends (12) pressure rollers (14) which are arranged vertically displaceably in a bearing (15) via a spindle drive (31). 13. The apparatus according to claim 9, characterized in that the lower press rollers (4) are supported on their circumference on pressure rollers (1). 14. The apparatus according to claim 9, characterized in that a side pressure roller (19) is arranged fixed, while the other side pressure roller (21) is provided on an arm (23) with a spindle drive (Fig.4). 15. The apparatus according to claim 9, characterized in that in the region of the lower horizontal press rollers (4) a motor drive with a drive chain (27) is provided (or cardan drive, direct motor drive via gear, etc.) 16. The method according to claim 6, characterized in that the beads (52) are partially bent in a semicircular shape and that for the convex curvature of the sheet on the flanges (9, 10), respectively left and right, starting from the web region (11), linearly increasing pressing forces ( 57) are provided, and that arc-shaped, linearly extending pressing forces (59) are applied to the beads (52) (FIG. 13). 17. The method according to claim 6, characterized in that the beads (52) are partially bent in a semicircular shape and that for concave curvature of the sheet (5) on the flanges (9, 10) in each case on the left and right, starting from the beads (52) and linearly increasing pressing forces (65, 67, 68) are provided on the beads (52) in the outer and inner regions, and that linearly increasing arc-shaped pressing forces (70) are applied in the transition to the web region (11), and that on the web region ( 11) a uniformly extending pressing force (40) is provided (FIG. 13). 18. The method according to claim 6, characterized in that the beads (52 ') in the extension of the flanges (9,10) are bent straight and that for the convex or concave curvature of the sheet (5) on the flanges (9,10) and linearly increasing or linearly decreasing pressing forces (74) are provided on the bent-up beads (52 ') on the left and right, starting from the web region (11), in conjunction with a uniform pressing force (40) on the central web (11) (FIG. 14). 19. The method according to claim 6, characterized in that for the conical bending of a sheet (5) in the web region (11) in the direction of the bending a linearly increasing pressing force (85) is provided and that at the transition regions to the flanges (9,10) linearly increasing arc-shaped pressing forces (82, 88) are formed and that on the flanges (9, 10) in the direction of the beads (52) linearly decreasing pressing forces (80, 91) are provided (Figure 15). 20. Apparatus for carrying out the method according to claims 1, 6 and claims 16 to 19, characterized in that the pressing and bending roller pairs are arranged one behind the other for a passage of the sheet (5) to be bent, one or two pairs of rollers to open the beads (52) or two pairs of bending rollers for rolling out the beads (52), one or two pairs of side pressing rollers (19, 21) for rolling out the flanges (9, 10), at least one pair of pressing rollers with bending rollers for the central web (11) and one or more (three more) Pairs of rollers for closing the beads (52) are provided, as well as horizontal press rolls connected upstream or downstream for the arcuate bending of the profile part and further lateral press rolls on the flanges 9, 10 of the sheet to be bent.

Images