WO2009059582A2

WO2009059582A2 - Bending machine for metal sheets

Info

Publication number: WO2009059582A2
Application number: PCT/DE2008/001800
Authority: WO
Inventors: Bernd Berg
Original assignee: Bergrohr Gmbh Siegen
Priority date: 2007-11-05
Filing date: 2008-11-04
Publication date: 2009-05-14
Also published as: DE112008003603A5; DE102008055780A1; WO2009059582A3

Abstract

Disclosed is a bending machine (11) for metal sheets (3), comprising a machine frame (12) that is fitted with a roller arrangement (13) encompassing rollers (13o, 13ul, 13ur) which are rotatably mounted within the machine frame (12), said roller arrangement (13) being used for partially bending the metal sheet (3) by means of at least one respective top and bottom roller (13o, 13ul, 13ur). The top roller/s (13o) and bottom roller/s (13ul, 13ur) are mounted at least in one common zone of the top roller/s (13o) and bottom roller/s (13ul, 13ur) from a perspective of the longitudinal extension of the respective roller (13o, 13ul, 13ur). The machine frame (12) of the bending machine (11) is approximately C-shaped in the operation and insertion zone (14) of the metal sheet (3) from a cross-sectional view relative to the rollers (13o, 13ul, 13ur). The open operation zone for the metal sheet that is to be partially bent allows the metal sheet to be only partially bent inside the C-shape.

Description

Bending machine for metal sheets

The present invention relates to a bending machine for metal sheets (hereinafter also referred to as sheets), preferably for the production of - possibly also multi-layer pipes -, more preferably of steel pipes with large wall thicknesses.

The production of pipes, preferably steel pipes, can be carried out by various methods according to the prior art.

For example, according to the two-roll bending process (also known as rounding, cf., for example, EP 1 197 272), this can be done on a two-roll bending machine (also called a two-roll rounding machine), where the surface of one of the rolls is designed to be pressure-elastic that as a result of the pressure-elastic material forms a depressed area, in which a deformation of the sheet takes place about the opposite pressure-rigid roller.

But the pipe production can also be done by the classical three-wrench bending process (also called rounding) in a three-roll bending machine (also called three-worm rounding machine) with appropriate Wakenanordnung (see this and in particular to the corresponding Wakenanordnung of these machines such as Mathee, Gerhard, ljieger Encyclopedia of Technology, Vol. 9, Encyclopedia of Production Engineering and Machinery, L - Z, p. 212, reverse sp. Below to the keyword "rounds" to p. 213, upper left column.) In the three-winder bending machine In the process, as the name implies, three wakes are used, usually one upper wake and two lower wafers, between which the sheet is rounded, ie formed into a tube The delivery of the Waken, ie its relative position - in particular its vertical and / or horizontal position - To each other defines the radius of the tube to be formed. In connection with the above-mentioned methods and machines it should be mentioned that occasionally the respective round machines or bending machines are also more generally referred to as bending rolls.

In principle, these processes almost always leave an undeformed area along the longitudinal edges of the sheet after bending (also called rounding or rolling), at least in the case of thicker sheets. This area usually extends over several hundred millimeters from the two sheet edges in the circumferential direction of the tube. To form this area are - apart from the case that a final forming in the bending roll itself, for example due to only small plate thickness, alone possible - mostly so-called Anbiegemaschinen used, which are usually subsequently used for forming the tube on the bending machine ,

Rolling dies are used in this manufacturing process. Here it comes to the final formation of the tube, when passing through fixedly mounted rollers, which - an inside in the not yet closed slotted tube (not yet closed pipe precursor) and an outside of the slotted pipe running - cause by their deliberately shaped contour the bend. The inner roll is pressed with a sword through the still open longitudinal seam of the future pipe against the inner wall and thus indirectly against the external role acting as a die (see also Fig. Ia - Id). However, this known, also known as roll bending process method known in the art has problems: The roller dies never fit exactly, as each sheet in terms of wall thickness and yield strength of the other sheets and thus also of the theoretical design sizes, after which the shape of the Anbiegerollen is determined , deviates. As a result, the bending radius generated deviates more or less from the desired target value, which causes an increased calibration effort.

In addition, there is the problem that the interpretation of the role form is based on empirical empirical values. An exact mathematical design method is not known to the inventor and the applicant. Therefore, the design of the rollers for higher strength materials is increasingly inaccurate because of the only empirically controlled method. There is no experience for this and these can be obtained only very difficult especially for small production quantities. The result is a low production security when bending with a high rework risk. Furthermore, in this method, it is possible to create excesses over the length of the pipe. As a result, the longitudinal edges are not continuous parallel, which can often cause interference with subsequent tack welding.

Damage to the welding bevel can also occur due to friction on the upper roller blades, as a result of which the precision, mechanically manufactured welding edge loses its uniformity, which can also frequently lead to problems with tack welding.

In the case of pipes that are not perfectly rolled, the transition from the formed sheet of the pipe into the bending zone is disturbed, resulting in form errors that are difficult to correct.

In addition, squeezing occurs at the pipe end, which is why the pipe gap over 20 - 30 mm in length greatly expands, which is why much manual work is required in this area.

Finally, it is with the use of a roller die so that at the same rotational speed of the rollers, the peripheral speed of the roller casing namely always corresponds only in a tangential point of the tube feed speed through the roller die. As a result, it can come at the other contact points of the role with the pipe jacket for slipping, towing or similar phenomena, but especially to bruising of the sheet edge at which the future longitudinal seam of the tube is to be created by welding. For thicker sheets, which require with increasing sheet thickness ever higher contact forces of the rollers against the die, but there is also an increasing risk that the aforementioned effects occur more often and lead to material damage, especially to undershooting the required sheet thickness in the Anbiegebereich, by additional Welding must be compensated and ultimately even the uselessness of the tube due to about a thereby occurring no longer compensable wall thickness under can result. Also, the different peripheral speeds of the rollers can lead to a local roughening of the surface, which increases the crack sensitivity of the tube.

Nevertheless, the method for medium and larger Fertigungslosgrößen for tubes made of low to medium strength steels and wall thickness of the tube shell up to a maximum of about 25 mm as well in practice. Overall, however, the use of roller dies is more demanding in the manufacturing process of pipes, such as For example, the production of thick-walled pipes, the use of high-strength materials, the production of small batch sizes, each taken in isolation, but even more in combination, associated with significant disadvantages for the achievable product quality and the achievable operating performance.

Another possibility for the final shaping of tubes according to the prior art consists in the use of Preßgesenken (see Fig. 2a - 2d), where a stamp - again by means of a through the still open gap of the not yet closed slotted tube (ie still non-closed pipe precursor) projecting sword - in a die, which can preferably be even pressed against the pipe itself, is pressed and in this case the sheet edges are finally formed, this shaping of the tube is intermittently at standstill. The disadvantages here are essentially the same as in the case of using a Rollengesenkes, the material pinches in the sheet edge area not quite as strong fail as in the final molding by means of a Rollengesenkes. Nevertheless, even here, especially in the case of thicker sheets, sheet metal deviations that are not to be tolerated, and thus wall thickness excesses, occur in the pipe.

A further possibility for the final shaping of tubes according to the prior art then consists in the use of press dies for preforming instead of final shaping (see, for this purpose, Figures 3a-3e). Here, an approximately flat sheet is pressed into a die, the sheet edges are preformed so completely at the beginning of the forming process. Although this method used especially in the forming of tubes by U and O presses - just like the Preßgesenkverfahren for final molding - mitigate the problem of Blechquantenquetschung something, but unfortunately not solve.

In addition, there is the problem that all the above methods in the sheet thickness ranges in which they can be used, are very inflexible, since it is not adaptable to the particular end product desired free-form process, but rather in each case to the final product suitable tools, namely about roles , Preßstempel and associated dies must be present or specially made, which in particular makes small production lots often uneconomical. If you want to offer a large range of products, especially the range of dimensions of pipes, so it requires a large number of tools, what the cost advantages of - in itself - cost-effective machine for large Part consumed again. Regardless of the question of cost-effectiveness, this also results in the event that a tool must be made extra, always the resulting temporal disadvantage.

As a solution in the state of the art, the so-called sheet metal edge pre-bending (also called roll forming, cf. Fig. 4), which is a free-form method in which a sheet metal edge protruding above a table is bent or profiled by means of rollers or rollers, is suitable here.

Although this is a free-form process, which is usually used preforming and requires no prefabricated tool, nevertheless arise here for thicker sheets, the adverse crimping in the sheet edge. In addition, the method can only be carried out in several stages, since only narrow bending zones can be achieved in one roll pass, which is time-consuming and therefore cost-intensive. Finally, the Anbiegebereich with approx. Max. 150 mm bending length is very limited in this procedure.

From the prior art, the patent CH 688 437 filed on 12.04.2004, a free-form method is further known, which can be used for cylindrically bending a plate, in which method the forming machine, the sheet by means of a supported upper roll and two also supported by supporting rollers lower rollers to form a complete tube. However, this method is limited to sheets with a maximum wall thickness of 35 mm. In addition, the sheets abut with their edges during the molding process on a thin plate which is attached to the machine frame of the forming machine and the support roller pair, which supports the top roller holds, so as to allow the formation of a complete tube. This machine is not suitable for rounding thick-walled sheets.

Based on this prior art, it is therefore an object of the present invention to provide a device for free-forming of sheets, which avoids the problem of Blechquanten- squishing and even round thick-walled metal sheets.

This is achieved by a bending machine for metal sheets with a machine frame, a roller assembly with rotatably mounted in the machine frame rollers for rounding the Metal sheet having at least one respective top and bottom roll, which is the storage of the top roll or top rolls and the storage of the bottom roll or bottom rolls over the longitudinal extent of the respective roll at least in a common region of top roll or top rolls and bottom roll or bottom rolls executed, said Maschiαengerüst the bending machine in the working and insertion area of the metal sheet seen in cross-section to the rollers is designed in approximately C-shaped and according to the invention is characterized in that the open working area for the sheet metal plate in the interior of the, CY (interior or interior of, Cs *) only a rounding of the sheet (and not a complete rounding to a pipe) allowed. The metal sheets are preferably those made of steel.

By means of the solution of a roller arrangement for rounding, which is designed according to a roller assembly for complete rounding of tubes, but here only the rounding of the sheet, a free-form bending of the sheet can be achieved, which does not lead to pinching of the sheet, in particular the sheet edge. For this purpose, however, it is necessary to sufficiently absorb the high forces occurring in this case, so that the rollers do not deflect too much. This is achieved in that - in contrast to a conventional bending machine (also called rounding machine or bending roll) in which the rollers, in particular the top roller, are mounted only at their ends - the storage of the top roller or top rollers and the storage of the bottom roller or bottom rollers Seen over the longitudinal extent of the upper roller (s) and / or lower roller (s) at least in a common region of upper roller (s) and lower roller (s) is executed and so the rollers in this common area of upper and lower rollers (n) are mounted against each other top and bottom roller side, which allows a sufficient action of the deformation or bending forces - even during rotation of the rollers - on the sheet in this area and thus here also thick sheets can be bent and therefore also be rounded. With the machine according to the present invention, it is thus possible, even thick-walled sheets, preferably those with thicknesses from or about 25 mm, particularly preferably from or more than 40 mm plate thickness continuously grooving with rollers that need only have a low bending stiffness and, accordingly, also a small diameter, preferably one which is less than or equal to 200 mm. The above statements relate preferably to sheets of steel. This is made possible by the C-shaped design of the machine frame, which on the one hand opens the possibility to support the rollers against each other in this way, so supporting the forces acting on the rollers scavenging, and to initiate the forces in the machine frame. On the other hand, the open area between the ends of the 'Cs' gives the opportunity to insert the sheet to be bent for processing. The machining of the sheet, which in the present invention consists in only rounding the sheet and not in complete rounding to form a pipe, is ensured by the open work area for the metal sheet to be contacted inside the CY. A complete rounding is not possible in. This bending machine according to the invention, since the metal sheet must not touch the walls of the C-shaped interior to avoid even the slightest pinching of the edges. However, the sheet metal plates to be processed and grooved in this bending machine can be thick-walled, preferably with thicknesses above or above 25 mm, particularly preferably above or above 40 mm.

In addition, the 'C-geometry' of the machine frame in the insertion and working area of the sheet is low in terms of intercepting high forces. The design of the bending machine according to the present invention is preferably chosen so that the forces are C-shaped passed around the sheet metal edge to be deformed. The forces to be used for rounding the thick-walled metal sheets can be so great that the force-absorbing elements are preferably connected to the particularly stable and solid machine frame of the bending machine.

In other words, the present invention is characterized in that in the molding of a metal sheet to a pipe by means of the bending machine as a result of the abutment of a sheet edge occurring (which is to be avoided) to the bending machine in the approximately C-shaped interior designed (always) Part of the metal sheet remains, the curvature, preferably significantly different from that which sets at the desired Rohradius.

When forming a pipe from a metal sheet, the respective edge length of the metal sheet specifies the pipe circumference. From the pipe circumference can then be calculated pipe diameter, pipe radius and the curvature. The curvature of the metal sheet in the bending direction would be in a molding to a completely self-contained, circular tube at all Set constant and can be specified by the sweeping radius. This value (curvature value) is possibly reached at the ends of the sheet metal plate when rounding the metal sheet, but is by no means present on the entire metal sheet.

Particularly preferably, the storage of the upper roll or upper rolls and the storage of the lower roll or lower rolls is performed substantially over the entire longitudinal extent of the respective roller, whereby the machine can be used in its entire width for bending even thick sheets. In this storage, of course, the storage of the top and bottom rollers (s) may be included with respective pins at the end of the respective roller.

Here, in contrast to a conventional bending machine (also called rounding machine or bending roll) in which the rollers, in particular the top roller, are mounted only at their ends - the storage of the top roller or top rollers and the storage of the bottom roller or bottom rollers substantially over the Whole longitudinal extent of the respective roller by means of the pins of the respective roller at its end and the intervening storage carried out, which supports the rollers between their ends, which counteracts a deflection.

Preferably, the storage of the upper roll or upper rolls and / or the storage of the lower roll or lower rolls - preferably substantially over the entire longitudinal extent of the respective roll - by means of - preferably each - a rolling bearing, preferably a support roller or a support roller executed, which is preferably shorter than is the roll to be supported by it and which is preferably in (about) in the middle of the longitudinal extent of the roll to be supported. Preferably, the storage takes place when it is carried out over substantially the entire longitudinal extent of the respective roller both by means of their own pin of the respective to be supported roller (such as top or bottom roller [n]) and the support roller and thus then substantially over its entire longitudinal extent.

Also, the storage of the upper roll or upper rolls and / or the storage of the lower roll or lower rolls - preferably substantially over the entire longitudinal extent of the respective roll - by means of - preferably each - a plurality of rolling bearings, preferably support rollers or support rollers be executed, each shorter as the roll to be supported by them and, taken as a whole, in longitudinal extension of the distribute the roller. Again, the storage is preferably carried out when it is carried out over the entire longitudinal extent of the respective roller substantially both by means of the own pin of the respective to be supported roller (such as top or bottom roller [n]) and the support roller and thus also here then essentially over its entire longitudinal extent.

Back-up rolls that rotate themselves or support rollers, such as ball bearings or roller bearings, which sit on a fixed non-rotating axis, are - as stated above - the preferred rolling bearings, with their help, the storage of the upper roll or upper rolls or the storage of the lower roll or lower rollers. Between the rolling bearings - preferably between individual support rollers or support rollers - or at the end of this is then the support of the bearings themselves and the introduction of forces into the machine frame on the variety of support points.

Preferably, not less than 20 rolling bearings are selected with a corresponding number of supports on the machine frame. In a particularly preferred embodiment of the bending machine according to the invention, support rollers are used to support the upper roller 30 and support the lower roller 24 in two rows next to each other, thus supporting the upper roller 60 and supporting each lower roller 48; this with a length of the rolls to be supported [top or bottom roll (s), ie the work roll (s)] of about 12 meters. Since the back-up rolls are generally slow to rotate, their static load-bearing capacity rather than their dynamic load-bearing capacity can be taken as a basis for obtaining as many support points as possible for a given diameter of the back-up rolls. Ball bearings or roller bearings - on a rigid axis, the number of support points can be increased even more. An adapted to the respective available space conditions of the machine design, the highest possible number of support points is desirable namely so as to achieve - as well as in combination with the C-shaped design of the machine frame - the best possible power distribution and force into the Maschiαengerüst.

In a particular embodiment of the present invention, the materials for supporting the upper and lower rollers, preferably the support roller or the support rollers or the support roller or support rollers are designed rigid. This embodiment causes the top and bottom rollers supported by the beigeesteifen materials preferably support rollers or support rollers, against each other about their entire axis exert approximately the same force on the metal sheet. Rolls, in particular rolls of long rolls, bend under the action of pressure, depending on the respective roll material, to varying degrees. This in turn leads to a non-uniform exercise of the pressure on the metal sheet and so - seen over the length - not to a uniform shape. The bending stiffness represents the relationship between the deflection and the applied load along a path. The bending stiffness EI is composed of the elastic modulus E of the material and the area moment of inertia I of the geometrically given cross section. The greater the flexural rigidity of the rolls, the more uniform the pressure transfer to the entire width of the metal sheet. In a particularly preferred embodiment, the material is such that the deflection of the rolls under the load of the rounding process is less than 10 mm. So the deviation of the longitudinal axis of the respective roller, upper or lower roller, from the ideal line of the roller axis is not more than 10 mm. The ideal line of the roll axis is a straight line which runs along the longitudinal axis in the center of the roll.

In a further embodiment of the present invention, this is characterized in that upper roll or upper rolls and lower roll or lower rolls are mounted in the machine frame itself, which in itself, in particular without the features of the mark of the present invention according to claim 1 is an independent invention, as Thereafter, the already shown force redirection is ensured in the machine frame, which allows the processing of thicker sheets for rounding.

In the present invention, the roll arrangement for rounding the sheet bar preferably corresponds to the roll arrangement of a two-roll round machine (also called a two-roll bending machine or a two-roll bending roll) or a three-roll round mill (also called a three-roll bending machine or a three-roll bending roll).

Also, one or more actuators may be provided, the or the upper roller or the upper rollers. on the one hand and the lower roll or the lower rolls on the other hand able to deliver relative to each other. In the case of several actuators, these can be distributed over the longitudinal extent of the respective roller (for example a work roll) or the roller arrangement so as to be able to counteract any remaining residual deflections of the respective roller or roller arrangement in a targeted manner - individually or in groups. The actuator or the actuators can be arranged on the upper roll side as well as on the lower roll side or also on the upper and lower roll side and are preferably designed as a hydraulic actuator, particularly preferably as a hydraulic cylinder.

Preferably, the actuator or the actuators may be arranged so that he or she the upper roll or the upper rolls via a functioning as a lever, rotatably mounted machine frame part relative to the lower roll or the lower rolls or the lower roll or the lower rolls against the upper roll or the upper rolls be able or able to supply. By such an arrangement, which is particularly preferred, and taken alone, in particular without the features of the mark of the present invention according to claim 1 is an independent invention, makes the bending machine, the high forces for rounding of the sheet, in particular for the rounding Thick sheets, must apply the leverage thus achieved for applying the forces required for the deformation process forces. In particular, in combination with a hydraulic actuator, preferably a hydraulic cylinder as SteEantrieb, this embodiment of the present invention is particularly preferred.

Overall, with the bending machine according to the present invention, the advantages of round machines (also called bending rollers or roll bending machine), ie in particular the possibility of crushing free-form processing of a sheet also used for the rounding of the sheet, especially in the sheet edge region and in particular for larger sheet thicknesses become. The rounded with the bending machine according to the invention plate can then be formed in a further forming machine to the tube and usually so that at the end of the tube forming process no Endformung the plate edges longer required, as this already with the bending machine in the way of the sheet edges beveling preforming is done.

In the following non-limiting exemplary embodiments will be discussed with reference to the drawings. In this show: 1a-Id a roll-forming device for reshaping according to the prior art with a half-side roller in cross-section in various steps of a Nachformungsverfahrens,

2a-c a press-forming device for reshaping according to the prior art with a press ram and a half-side illustrated on an arm movably mounted die in cross-section in various steps of a Nachformungsverfahrens,

3a-3e show a pressing die for preforming according to the prior art with a press ram and a solid die in cross-section in various steps of a Vorformungsverfahrens,

4 shows a device for roll profiling of sheet metal edges in free-form process in cross-section,

5 is a perspective overview of a preferred embodiment of a bending machine according to the present invention,

6 is a front view of the bending machine according to the invention of FIG. 5,

7 shows a cross section of the bending die according to the invention according to FIGS. 5 and 6 along the axis L-L from FIG. 6, FIG.

8 is a side view of the bending machine according to the invention according to FIGS. 5 and 6,

9 shows a cross section of the bending machine according to the invention according to FIGS. 5 and 6 along the axis K - K from FIG. 6

10 is an overview view of another preferred embodiment of a bending machine according to the present invention in cross-section,

11 shows an embodiment of a bearing - here the upper roller - according to the present invention,

Fig. 12 shows a particularly preferred embodiment of a storage - liier the

Top roller - according to the present invention, and Fig. 13 shows a further preferred embodiment of a storage - Her the top roller - according to the present invention.

1a-1d show a roll forming device for post-forming according to the prior art with a roll 1 shown on one side in cross-section in different steps of a post-forming process.

In this Endformungsverfahren the forming begins at the transition from the bent to the non-bent portion of the sheet and continues in the direction of the sheet edge 2. Here, an unwanted crushing of the sheet edge 2 can be generated. This effect occurs the less the thinner the sheet for forming the tube 3, since in this case the deformation forces are smaller, and occurs more disturbing in appearance, the more the wall thickness of the tube 3 increases.

The final shaping of the tube 3 takes place during its passage through fixedly mounted rollers 1 (seen here only half-sided) and the corresponding associated Rollengesenk 4 as a counterpart thereto, the rollers 1 with a sword 5 through the still open longitudinal seam 6 of the future pipe (slotted tube ) 3 are pressed against the die 4. However, this common, also known as roll bending process deformation process according to the prior art has problems: At the same rotational speed of the rollers 1, the peripheral speed of the roller shell always corresponds only in a tangential point of the tube feed speed through the roller die 4. This makes it possible at the other contact points of the role 1 with the pipe jacket for slipping, towing or similar phenomena, but especially to bruises in the direction of the sheet edge 2 come, which is to form the future longitudinal seam of the tube 3.

For thicker sheets, which require with increasing sheet thickness ever higher contact forces of the rollers 1 against the die 4, there is now an increasing risk that the aforementioned effects - especially the bruising of the sheet on the sheet edge 2 - occur more often and material damage, especially lead to underruns of the required sheet thickness, which may ultimately even the uselessness of the tube to be formed 3 due to such as a thereby entering below wall thickness result. Fig. 2a - c show a Preßgesenkvorrichtung for reshaping according to the prior art with a Pestßstempel 8 and a movably mounted on an arm 7 die 4 in cross-section (here only half on the left side - seen in the viewing direction - dargesteEt) in different process carriage a Nachformungsverfahrens. Here, the shaping of the (future) pipe 3 takes place cyclically at a standstill. The already mentioned squeezing problems on the sheet metal edge 2 are indeed somewhat mitigated, but can not be prevented.

Figures 3a-3e show a prior art preform press die apparatus having a ram 8 and a fixed die 4 in cross-section in different process slides of a preforming process. In this case, the sheet forming the future tube 3 is pressed in approximately even state by means of the press ram 8 in the die 4 and thus receives in the direction of the sheet edges 2 a rounding. After this, the sheet can then be finally formed into a tube, preferably by the UO method.

Fig. 4 shows an apparatus for Walzprofüierung of sheet edges in free-form process (also called Blechkantenvorbiegen) in cross section. Here, over a table 9 projecting sheet edge 2 is bent or profiled by means of rollers 1 or rollers.

Although it is a free-form process, which can be used preforming, and thus requires no prefabricated tool. However, even with thicker sheets 3, the disadvantageous squashing in the area of the sheet metal edge 2 already mentioned is also produced here. The method can also only be carried out in several stages, since only narrow bending zones can be achieved in one roll pass, which is time-consuming and therefore cost-intensive. In addition, the Anbiegebereich with approx. 150 mm bending length is also very limited in this procedure.

5 shows a perspective overview of a preferred embodiment of a bending machine U according to the present invention.

6 shows a front view of the bending machine 11 according to the invention according to FIG. 5 from the side of the sheet metal inlet with markings of the axes of intersection of the axes L - L and K - K, to which reference is now made in the following FIGS.

Fig. 7 shows a cross section of the bending machine according to the invention according to Fig. 5 and 6 along the axis L - L of Fig. 6 and that here, C shown open to the left. To see a bending machine for metal sheets with a machine frame 12, a roller assembly 13 with rotatably mounted in the machine frame rollers 13o, 13ul, 13ur for rounding the metal sheet 3 by means of at least one top roller 13o and one - seen in the viewing direction in cross-section - left bottom roller 13ul and a right lower roller 13ur, wherein the support of the upper roller 13o and the support of the lower rollers 13uf, 13ul are carried out substantially over the entire longitudinal extent of the respective roller 13o, 13ul, 13ur. In the present case, this storage takes place via a plurality of support rollers 10o, 10u along the roller 13o, 13ul, 13ur to be supported, which remove the forces from the roller 13o, 13ul, 13uf to be supported and introduce them into the machine frame 12 at a plurality of locations. Here, this is done by upper support rollers 10o and lower support rollers 10u, which in turn are mounted in the machine frame 12. An embodiment of the bearing according to the present invention can also be taken from the following description in FIGS. 11, 12 and 13 here.

In the embodiment of the bending machine according to the invention here corresponds to the roller assembly 13 for rounding the metal sheet 3, which later forms the slit pipe and after welding the longitudinal edges of the finished tube, the roller assembly of a three-roll rounding machine.

The machine frame 12 of the bending machine is designed in the working and insertion region 14 of the metal sheet 3 in cross-section to the rollers in an approximately C-shaped configuration.

Actuators 15 - here hydraulic cylinder - provided (only one can be seen here in cross-section), which are able to deliver the top roller 13o relative to the bottom rollers 13ul, 13ut.

In this case, the actuators 15 are arranged so that they are able to deliver the top roller 13o via a lever, rotatably mounted machine frame part 16 relative to the bottom rollers 13ul, 13ur. The rotatable mounting 17 is here by means of a joint approximately in the middle of the machine - seen in cross section - executed.

FIG. 8 shows a side view of the bending machine according to the invention according to FIGS. 5 and 6. The use of the reference numbers here corresponds to that of FIG. 7 here, that shown C open to the right. 9 shows a cross-section of the bending machine U according to the invention according to FIGS. 5 and 6 along the axis K-K from FIG. 6 here, that C shown open to the right

The use of reference numerals was largely omitted here because of the great similarity to FIG. 7. Only one of them here in cross-section - i. with its inner life - to be seen and serving as an actuator hydraulic cylinder 15 is designated. The remaining elements are already known from the preceding figures, in particular from FIG. 7.

Fig. 10 shows an overview of a further preferred embodiment of a bending machine according to the present invention in cross-section here that, C shown open to the right.

Again, a bending machine according to the invention for metal sheets 3, which later form the slotted tube and after welding the longitudinal edges of the finished tube to see with a machine frame 12, a roller assembly 13 with rotatably mounted in the machine frame rollers for rounding the metal sheet 3 mediate at least a top roller 13o and a left lower roller 13ul and a right lower roller 13ur as viewed in cross section, the bearings of the upper roller 13o and the bearings of the lower rollers 13ul, 13u being substantially over the entire longitudinal extent of the respective roller 13o, 13ul, 13ur is executed. In the present case, this bearing also takes place in this embodiment according to the present invention via back-up rolls, namely upper back-up rolls 10 o and lower back-up rolls 10 u, which in turn are themselves mounted in the machine frame 12.

Again, the roller assembly 13 for rounding the metal sheet 3 (which later forms the tube) corresponds to the roller assembly of a three-roll rounding machine.

Likewise, the machine frame 12 of the bending machine in the working and insertion region 14 of the metal sheet 3 in cross-section to the rollers seen in approximately C-shaped configuration.

As an actuator 15, a hydraulic cylinder is also provided here, and indeed one such, the upper roller side arranged the upper roller can deliver relative to the lower rollers.

On the other hand, acting as a lever, rotatably mounted machine frame part was omitted according to this embodiment of the present invention. Fig. 10 shows, as well as Figs. 5 to 9, the stability of the machine frame, which must be designed to accommodate the forces occurring during the bending process. In all of these figures, the upper roller 13o and the upper rollers and the lower rollers 13ul, 13ur connected via their storage directly to the machine frame.

Fig. U shows an embodiment of a storage - here the top roller 13o - according to the present invention. The storage of the upper roller 13 (shown here only by way of example for a top roller, so also usable for several top rollers or storage of the bottom roller or bottom rollers) takes place here according to the invention over the entire longitudinal extent of the respective top roller 13o and that with the aid of a support roller 10o, which is shorter than is to be supported by her top roller 13o, and here is approximately in the center of the roller to be supported 13o. The support roller 10o is itself supported by its pins 18 at the respective end of the roll by means of supports 19 in the machine frame 12. The upper roller bearing over the entire longitudinal extent is done here so by means of the own pin of the upper roller 20 and the support roller 1Oo and thus substantially over its entire longitudinal extent.

Fig. 12 shows a particularly preferred embodiment of a storage - here the top roller 13o - according to the present invention. The storage of the upper roller 13o (also shown here only as an example for a top roller, so also usable for several top rollers or storage of the bottom roller or bottom rollers) takes place here according to the invention over the entire longitudinal extent of the respective top roller 13o and that with the help of a variety - here thirty Struck - Of back-up rollers 10o, which are arranged here in two rows and each shorter than the top roller to be supported by them 13o. Viewed in entirety, the back-up rolls 10o are distributed in the direction of the longitudinal extent of the upper roll 13o to be supported and guide the forces removed by the upper roll 13o at a multiplicity of locations - here on the left and right of the respective back-up rolls 10o-via the pins of the back-up rolls 10o and 10a associated supports 19 in the machine frame 12 a.

Fig. 13 shows a further preferred embodiment of a storage - here the top roller 13o - according to the present invention by means of support rollers instead of support rollers and here by means of ball bearings 10o, which are arranged on a rigid axle 21, which between the ball bearings 1Oo by means of supports 19 on the machine frame 12 is attached. Again, be here the forces taken off from the upper roll 13o are introduced into the machine frame 12 via the supports 19.

Claims

claims

1. Bending machine (11) for metal sheets (3) with a Maschiαengerüst (12) having a roller assembly (13) in the machine frame (12) rotatably mounted rollers (13o, 13ul, 13ur) for rounding the metal sheet (3) by means of at least an upper and lower roller (13o, 13ul, 13ur) and the storage of the upper roller (13o) or upper rollers and the storage of the lower roller or lower rollers (13ul, 13ur) over the longitudinal extent of the respective roller (13o, 13ul, 13ur) seen at least in a common area of top roll (13o) or top rolls and bottom roll or bottom rolls (13ul, 13ur), wherein the machine frame (12) of the bending machine (U) in the working and insertion area (14) of the metal sheet (3) in cross section to the rolls (13o, 13ul, 13ur) is designed in approximately C-shaped, characterized in that the open working area for the sheet metal to be targeted in the interior of the, CY allows only a rounding of the sheet.

2. Bending machine (11) for metal sheets (3) according to claim 1, characterized in that the open working area for the sheet to be investigated in the interior of the, CV is limited so that in the formation of a metal sheet to a pipe by means of the bending machine due to Occurring abutment of a sheet edge to the bending machine in the open work area for the sheet metal plate to be targeted in the interior, CV a part the sheet remains, the curvature of which differs significantly from that in the. set desired pipe radius.

3. Bending machine (11) for metal sheets (3) according to claim 1 or 2, characterized in that the storage of the upper roll (13o) or upper rolls and the storage of the lower roll or lower rolls (13ul, 13ur) substantially over the entire longitudinal extension of the respective Roller (13o, 13ul, 13ur) is executed.

4. bending machine (U) for metal sheets (3) according to claim 1 to 3, characterized in that the storage of the upper roll (13o) or upper rolls and / or the storage of the lower roll or lower rolls (13ul, 13ur) by means of a, preferably centrally supporting, rolling bearing (10o, 1Ou), preferably a support roller or support roller is designed, which is preferably shorter than the roller to be supported by it (13o, 13ul, 13ur).

5. bending machine (U) for metal sheets (3) according to claim 1 to 3, characterized in that the storage of the upper roll (13o) or upper rolls and / or the storage of the lower roll or lower rolls (13ul, 13ur) by means of a plurality of rolling bearings (10o, 10u), preferably supporting rollers or supporting rollers, which are each shorter than the roller to be supported by them (13o, 13ul, 13ur) and are seen in their entirety in the direction of the longitudinal extension of the roller to be supported (13o, 13ul, 13ur ) to distribute.

6. Bending machine (11) for metal sheets (3) according to any one of the preceding claims, characterized in that the materials for supporting the upper roll (13o) or upper rolls and / or the lower roll or lower rolls (13ul, 13uf) are designed rigid.

7. bending machine (11) for metal sheets (3) according to claim 4, characterized in that the rolling bearing (10o, 1Ou), preferably a support roller or support roller is designed rigid.

8. bending machine (U) for metal sheets (3) according to claim 5, characterized in that the rolling bearings (10o, 1Ou), preferably support rollers or support rollers are designed rigid.

9. bending machine (11) for metal sheets (3) according to any one of the preceding claims, characterized in that upper roll (13o) or upper rolls and Unterwake or Unterwaken (13ul, 13ut) are mounted in the machine frame itself

10. bending machine (U) for metal sheets (3) according to any one of the preceding claims, characterized in that the roller assembly (13) for rounding the metal sheet (3) corresponds to the Wakenanordnung a two-worm-round machine.

11. Bending machine (U) for metal sheets (3) according to a det claims 1 to 9, characterized in that the Wakenanordnung (13) for rounding the metal sheet (3) of the roller assembly corresponds to a three-worm-round machine.

12. bending machine (11) for metal sheets (3) according to any one of the preceding claims, characterized in that an actuator (15) or a plurality of actuators (15) is provided or are, the or the upper wake (13o) or the upper arms on the one hand and the subwake or the underwears (13ul, 13ur), on the other hand, are capable or relatively able to deliver against each other.

13. Bending machine (U) for metal sheets (3) according to claim 12, characterized in that the actuator (15) or the actuators (15) is arranged on the upperwake side or are.

14. bending machine (11) for metal sheets (3) according to claim 12 or 13, characterized in that the actuator (15) or the actuators (15) is arranged on the under side or are.

15. Bending machine (11) for metal sheets (3) according to claim 12, 13 or 14, characterized in that the actuator (15) or the actuators (15) is arranged or are that he or she the Oberwake (13o) or the upper wakes can or can be delivered relative to the subwake or the subwings (13ul, 13ur) by means of a machine frame part (16) acting as a lever, rotatably mounted.

16. bending machine (11) for metal sheets (3) according to any one of claims 12 to 15, characterized in that the actuator (15) or the actuators (15) is arranged or are that he or she the Unterwake or the Unterwaken ( 13ul, 13ur) over one when functioning, rotatably mounted machine frame part (16) relative to the top roller (13o) or the top rollers can deliver or able.

17. Bending machine (U) for metal sheets (3) according to any one of claims 12 to 16, characterized in that the actuator (15) or the actuators (15) as a hydraulic actuator, preferably as a hydraulic cylinder (15) is executed or executed.

18. Bending machine (11) for metal sheets (3) according to one of claims 12 to 17, characterized in that the actuators (15) are actuated individually or in groups to selectively counteract deflections of the roller or rollers (13o, 13ul, 13ur) ,