WO2010118759A2

WO2010118759A2 - Bending press for sheet panels

Info

Publication number: WO2010118759A2
Application number: PCT/EP2009/002797
Authority: WO
Inventors: Gmbh Siegen Bergrohr; Bernd Berg
Original assignee: Gmbh Siegen Bergrohr; Bernd Berg
Priority date: 2009-04-16
Filing date: 2009-04-16
Publication date: 2010-10-21
Also published as: WO2010118759A3; WO2010118759A4; EP2419227A2; EP2419227B1

Abstract

A bending press (11) for sheet panels (3), comprising a machine frame (12), which has a cheek assembly (13) with an upper cheek (13o) and a lower cheek (13u) disposed approximately in parallel to each other in the longitudinal extension and which is configured approximately crescent-shaped in the working and insertion region (14) of the sheet panel (3) and viewed in the cross-section to the longitudinal extension of the cheeks (13), wherein the lower (13u) and upper cheeks (13o) form the end points of the open crescent, and a bending cheek (13b) for partially bending the sheet panel (3), which is disposed inside the crescent, wherein an actuator (15a, 15b) or a plurality of actuators (15a, 15b) is or are provided, which can feed the bending cheek (13b) and the machine frame (12) or a part thereof relative to each other, which enables the partial bending of the sheet (3).

Description

Title: Bending press for metal sheets

The present invention relates to a bending press for metal sheets (also referred to as sheets), preferably for the production of - possibly 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 referred to as rounding, cf., for example, EP 1 197 272), this is 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 compressively 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.

However, pipe production can also be carried out by the conventional three-roll bending process (also called rounding) in a three-roll bending machine (also called a three-roll rounding machine) with a corresponding roll arrangement (cf., in this connection and in particular to the corresponding roll arrangement of these machines, for example Mathee, Gerhard, Lateger Encyclopedia of Technology, Vol. 9, Encyclopedia of Manufacturing Technology and Machinery, L - Z, p. 212, reverse sp. Below to the keyword "rounds" to p. 213, upper left column.) In the three-roll bending machine In this case, as the name implies, three rolls are used, usually a top roll and two bottom rolls, between which the sheet is rounded, ie formed into a tube The delivery of the rolls, ie their relative position - in particular their 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 these methods, almost always - at least in the case of thicker sheets - after bending a sheet to the tube (also called rounding or rolling) remains an undeformed area along the longitudinal edges of the sheet. Depending on the diameter and wall thickness of the pipe, this area can extend over several hundred millimeters from the two sheet metal edges in the circumferential direction of the pipe. 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 , but also preforming can be used.

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 roller is pressed with a sword through the still open longitudinal slot 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 analytical 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 this can be very difficult especially for small production quantities be won. The result is a low production security when bending with a high rework risk.

Furthermore, ripples can occur across the length of the tube in this process. 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. This leads to slippage at the other contact points of the roll with the pipe jacket, which may lead to dragging or similar phenomena, but especially to pinching of the sheet edge (s) at which the future longitudinal seam of the pipe is to be produced 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 such an ensuing, no longer compensable wall thickness may result below. 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 applies to medium and large production lot sizes for pipes made of low to medium-strength steels and for wall thickness of the pipe jacket up to a maximum of about 25 mm as well usable in practice. Overall, however, the use of roller dies is inherent in demanding pipe manufacturing requirements, such as the manufacture of thick walled pipes, the use of high strength materials, the production of small batch sizes, taken in isolation, but much more in combination Disadvantages associated with 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 - 2c), 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 and thus wall thickness undershoots which are not tolerable occur on 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). Flierbei 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 have a large product range, especially Range of tubes, so it requires a large number of tools, which consumes the cost advantages of a - in itself - cost-effective machine for the most part 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 generally used preforming and does not require any prefabricated tool, the detrimental pinching in the area of the sheet edge also occurs here on thicker sheets. 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 with the aid of a supported upper roll and two also supported by support 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. For bending - in particular rounding - thick-walled sheets, this machine is not suitable.

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 Blechquantenverquet- and also bend thick-walled metal sheets, in particular can round. This is solved by a bending press for metal sheets

a machine frame, which has a cheek arrangement with in the machine frame in longitudinal extent approximately parallel to each other arranged upper cheek and lower cheek,

seen in the working and insertion area of the metal sheet and in cross-section to the longitudinal extent of the cheeks designed approximately crescent-shaped, wherein the lower and upper cheeks form the end points of the open sickle and

a bending cheek for bending - preferably rounding, i. bend (partially) circularly - the sheet metal plate, which is arranged inside the sickle,

wherein an actuator or a plurality of actuators is or are provided, the one or the bending beam on the one hand and the machine frame or a part of the same - such as upper or lower cheek - on the other hand relatively able to deliver or able, which allows the bending - preferably rounding - of the sheet or allowed.

By means of this arrangement, in particular by means of the relative delivery of the bending beam inside the sickle to the machine frame or a part thereof (upper or lower beam are about such parts) a free-form bending of the sheet can be achieved, the bruising of the sheet, in particular its sheet edge to a minimum reduced, in many cases even completely avoided. Freeforming is made possible by the fact that both the sheet feed (or withdrawal) in the (from) the bending press for processing, as well as the aforementioned relative delivery in any intermediate positions is possible, wherein during pressing in contrast to the bending rolls feed and bending (delivery of Actuators for bending) alternating (intermittent), but not done simultaneously. For this purpose, it is necessary to sufficiently absorb the high forces occurring during pressing.

This is made possible by the crescent-shaped design of the machine frame, which on the one hand offers the possibility to support the - preferably approximately - opposite cheeks so that the forces acting on them are intercepted and introduced into the entire machine frame. On the other hand, the open area between the ends of the sickle gives the opportunity to insert the sheet to be bent for processing. The Bear processing the sheet, which in the present invention yes only in a bending - preferably rounding - of the sheet and not in a complete rounds to a pipe, is ensured by the open working area for the - preferably curved - sheet metal plate inside the sickle where a - preferably movable - bending cheek is arranged. A complete rounding is not possible in this bending press according to the invention, since the sheet metal forming is limited by the available sickle interior. However, in this bending press to be processed and to be angegled sheet can be thick-walled, preferably with such strengths from or about 25 mm, more preferably those from or over 40 mm or even over 50 mm, which preferably refers to sheets of steel.

As already mentioned, the crescent-shaped geometry of the machine frame in the insertion and working area of the sheet is favorable with regard to the high forces to be absorbed. The design of the bending press according to the present invention is in fact chosen so that the forces are guided sickle-shaped (approximately, C '-shaped) around the sheet metal edge to be deformed.

Preferably, the lower and upper cheeks, which form the end points of the open sickle, viewed in cross section and in the vertical projection on a horizontal, offset from one another to achieve a good bending action of the press.

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 press according to the invention as a result of the abutment of a sheet metal edge (which must be avoided) to the press brake in the interior of the sickle (always) a part of Metal sheet remains, whose curvature, preferably significantly, deviates from that which sets in the desired pipe radius.

When forming a pipe from a metal sheet, one of the edge lengths of the metal sheet predetermines 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 constant at all points when formed into a completely self-contained circular pipe and may be indicated by the reciprocal of the radius (Krürnmungswert). This value (value of curvature) is at the bending of the metal sheet by means of the bending press according to the invention already at the - parallel to the longitudinal axis extending - other edges of the sheet metal reached, but is not on the entire metal sheet before, because no complete tube is formed.

The bending cheek can be arranged on the underside as well as the upper side in the machine frame, in the first (bottom) case of the actuator or the actuators the bending beam on the one hand and the upper beam on the other hand relatively able or able to deliver and in the second (top) case of the actuator or the actuators the bending cheek, on the one hand, and the lower cheek, on the other hand, are able or able to deliver relative to one another.

Preferably, the bending cheek is movable relative to the machine frame or a part thereof, it being possible for it to be arranged both above and below and at the same time movable both in the vertical and in the horizontal direction, as well as in both directions To obtain the greatest possible flexibility in the free shaping of the sheet to be added.

To further increase this Flexibiliträt, as well as for a simple construction of the bending press sake, the bending cheek can also be mounted pivotably about an axis.

Also, one or more actuators may be provided, the one or the other hand, the upper beam on the one hand and the lower cheek on the other hand able to deliver against or capable of doing. In the case of multiple actuators, these can be distributed over the longitudinal extension of the respective cheek so as to be able to selectively counteract any diverging forces at different points or in different sections-individually or in groups. The actuator or the actuators may preferably be arranged both on the upper side and on the lower side or upper and unterangenseitig and are preferably designed as a hydraulic actuator, particularly preferably as a hydraulic cylinder. But it may also be that this actuator or these actuators coincide with the actuator, the one or the bending beam on the one hand and the machine frame or a part of the same - such as upper or lower cheek - on the other hand able to deliver relative to each other or assets.

Preferably, the actuator or the actuators may be arranged so that he or she the upper beam via acting as a lever, pivotally mounted (or rotatable) machine frame part relative to the lower cheek or the lower cheek against the Oberwange able or able to deliver. By such an arrangement, which is particularly preferred, and taken alone, in particular without the features of the characteristic of the present invention according to claim 1 is an independent invention, makes the bending press, the high forces for bending of the sheet, in particular for bending 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 an actuator, this embodiment of the present invention is particularly preferred.

In a further preferred embodiment, the bending press according to the present invention may have a contouring element, preferably a die, which acts on the side of the metal sheet to be concaved (in the case of a pipe this corresponds to the inside of the pipe to be formed) so as to assist the molding process. Such an embodiment is always advantageous when a larger number of deformation processes with always the same contour, so as a rounding of tubes always the same diameter to take place, because in this case such contouring element a faster manufacturing process as about the free-form by means of bending cheek and piecemeal feed of the sheet allowed. The contouring element acting on the side of the metal sheet to be concaved can be arranged on the upper cheek, the lower cheek or also on the bending cheek; A combination of these types of attachment is possible. The contouring element is preferably mounted replaceable on the bending press, so that various elements, such as different dies for various to be formed sheets held and brought by means of the press brake can be used.

On the other hand, in the case of the bending press according to the invention, the attachment of a die on the convex side of the metal sheet does not have a contouring effect.

Overall, with the bending press according to the present invention, the advantages of a free-form process, ie in particular the possibility of crushing free-form processing of a sheet can also be used for the bending of the sheet, in particular in the sheet edge region and in particular for larger sheet thicknesses. For standard products with always the same dimensions, the bending press can also, by means of a - preferably replaceable - forming element, such as a die, to be bent on the concave 1 O

Sheet metal side is arranged to be modified so as to achieve a higher operating speed for these standard products over the pure free-form bending, but without having to give up the flexibility of a freely forming bending process, since it also remains possible, the sheet to be formed in any small slot -Abschnitten also piece by piece in the press and bail freely using the bending beam, without the bend must go so far that the sheet while hugging completely to the shaping element.

The sheet metal bent around with the bending press according to the invention can be formed after rounding in a further forming machine to the tube and that usually so that at the end of the tube forming process no reshaping of the sheet edges longer required, as this already with the bending press in the way Sheet edges rounding preforming is done.

Preferably, the bending press according to the invention is used for rounding a metal sheet by at least a quarter of the pipe circumference at least one sheet metal edge, which is particularly preferably done on two opposite edges of the sheet. This corresponds to a bending angle of at least 90 ° at each of the two sheet edges. In this way, a tube forming process can be initiated, which allows, in contrast to the classical tube forming method, the tube from the edges already largely bring in its intended form, which reduces the remaining effort in the final molding, since it only in the middle of Sheet metal must be rounded to the end. This avoids the problem of insufficiently shaped sheet edges, without exposing them to unnecessary bruising and also facilitates the final shaping.

Particularly preferably, the bending press is used according to the present invention for rounding a multi-layer metal sheet, such as a Mehrlagenrohr, such as a Doppellagagenrohr anzurunden. This is done according to the invention in that the metal sheet is always rounded at the same time over its entire length to be machined, what a corresponding width - seen in the longitudinal extent of the pipe to be produced - conditionally.

Preferably, the bending press according to the invention for metal sheets is therefore characterized in that the longitudinal extent of the cheeks more than 4 m, more preferably more than 10 m. Furthermore, it is also advantageous to provide in the bending press according to the invention a feeding and / or retraction device - such as a WaLzenanordnung - which serves the insertion and / or the withdrawal of the metal sheet in or out of the bending press, which also serves as a holding device for fixing the Metal sheet can serve during the bending process.

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 - 2c, a press-forming device for reshaping according to the prior art with a ram and a half-side illustrated, movably mounted on an arm 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 shows a cross section of a preferred embodiment of a bending press according to the present invention,

6 is a perspective view of the preferred embodiment of the bending press according to the invention shown in FIG. 5,

7 shows a cross section of a further preferred embodiment of a bending press according to the present invention,

8 shows a perspective view of the preferred embodiment of the bending press according to the invention according to FIG. 7, FIG. 9 shows a cross section of a section of an embodiment of the bending press according to the invention with a top cheek side arranged die, and

10 shows a cross-section of a section of a further preferred embodiment of a bending press according to the present invention with a web and cheek cheek side arranged die.

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 method deformation process according to the prior art has problems: With the same rotational speed of the rollers 1, the peripheral speed of the roller shell namely only in a tangential point of the tube feed speed through the roller die 4. This is what happens at the other contact points of the role 1 with the pipe jacket for slipping, which can lead to towing or similar phenomena, but especially to bruises in the direction of the sheet edge 2, 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 pinching of the sheet on the sheet edge 2 - occur more and damage to material, especially fall below the required sheet thickness, the ultimately even the uselessness of the tube 3 to be formed as a result of about a thereby entering wall thickness undercut may result.

2a-2c show a Preßgesenkvorrichtung for reshaping according to the prior art with a ram 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 - shown) in different steps of a process Nachformungsverfahrens. The shaping of the (future) tube 3 is effected intermittently 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 various process steps 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. Hüernach can then be the sheet, preferably after the UO process, be final-formed into a tube.

4 shows a device for roll profiling sheet metal edges in the free-form process (also referred to as sheet edge pre-bending) 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.

Fig. 5 shows a cross section of a preferred embodiment of a bending press 11 according to the present invention, here the, SicheP shown open to the left.

The machine frame 12 of the bending press is seen in the working and insertion area 14 of the metal sheet 3 in cross section to the bending cheeks 13 designed approximately crescent-shaped, which means for the purposes of the present invention that the geometry in cross-section considered a, C is similar, but this, C also reversed, ie to the left open - as seen in the figure here - can be designed. Likewise, the end points of the polyline of,, C are preferably not mutually (as also shown here in the figure), but are rather offset from each other, which promotes or allows the generation of the bending for bending - preferably rounding required bending moment. Crescent-shaped in the sense of the present invention thus includes - considered schematically in the respective cross section - in particular also the following forms: CU CJ JD CJ ιJ

To see a bending press 11 for metal sheets 3 with a machine frame 12, which has a bending cheek assembly 13 for bending the metal sheet 3 by means of at least one upper cheek 13o and one - seen in the viewing direction in cross section - lower cheek 13u. Also, a bending cheek 13b can be seen, which is arranged on the underside in the machine frame 12. The bending press 11 to be seen here is thus sickle-shaped in the sense of an 'LH' arrangement.

The upper beam 13o engages here on the side of the metal sheet 3 to be concaved. The bending cheek 13b is here both in the vertical direction 18, as in the horizontal direction 19 relative to the machine frame 12 movable. In addition, it is pivotally mounted about an axis 21. This makes it possible, by means of the cheek assembly 13, in particular by means of the bending cheek 13b - approximately using a positioning or positioning control - an actuator, such as an actuating cylinder 15a each perform a continuous positioning of the bending beam 13b in all directions of movement 18, 19, which is preferably in Cooperation with a controllable feeder - here feed rollers 20 - a free shaping of the metal sheet 3 and thus allows their free bending.

This is aided by the fact that actuators 15b - here hydraulic cylinder - are provided (here only one to see in cross-section), which are able to deliver the upper beam 13o relative to the lower cheek 13u and also the lower side arranged in the machine frame bending beam 13b.

The actuators 15b are arranged so that they are able to deliver the upper beam 13o via a lever-acting, pivotally mounted machine frame part 16 relative to the lower beam 13u and the lower side arranged in the machine frame bending beam 13b. The pivotable mounting 17 is here by means of a joint approximately in the middle of the machine - seen in cross section - executed. Fig. 6 then shows for better illustration a perspective view of the preferred imple mentation form of the bending press according to the invention of FIG. 5, reference being made to the reference numerals in Fig. 5.

7 shows a cross-section of a further preferred embodiment of a bending press 11 according to the present invention, and here too with a sickle ^* open to the left.

The machine frame 12 of the bending press 11 is seen in the working and insertion area 14 of the metal sheet 3 in cross-section to the bending cheeks 13 designed approximately crescent-shaped, which means in the context of the present invention that the geometry viewed in cross section again resembles a reversed, O, what in the case of the here to be seen bending press 11 a crescent-shaped arrangement in the manner of, ι- I 'corresponds.

To see a bending press for metal sheets 11 with a machine frame 12, which has a bending cheek assembly 13 for bending the metal sheet 3 by means of at least one upper cheek 13o and one - seen in the viewing direction in cross-section - lower cheek 13u. Also, a bending cheek 13b can be seen, which in turn is arranged on the underside of the machine frame 12.

The upper cheek 13o attacks here on the concave side of the sheet metal plate 3 due to their rounded training in one point. By contrast, the bending cheek 13b here is flat.

The bending cheek 13b is pivotally mounted about an axis 21, wherein the axis 21 in a vertical 18 and horizontal direction 19 relative to the machine frame 12 is movable. Flier by and by means of the cheek assembly 13 can, for example using a positioning or positioning, by means of the actuator 15a - about / used for the pivoting of the bending beam about the axis 21 hydraulic cylinder (s) 15a - a continuous positioning of the bending beam 13b in all possible linear directions of movement 18, 19 as well as rotational movement positions are made about the axis 21, preferably in cooperation with a controllable feed / retraction device - here the feed / retraction rollers 20 - a free shaping of the metal sheet 3 and thus their free bending - preferably Rounding - allows. This is supported by the fact that (one) actuator ^) 15b - here a hydraulic cylinder - is / are provided, the / the lower cheek 13u able to deliver against the upper cheek 13o / able.

FIG. 8 then shows, for a better illustration, a perspective view of the preferred embodiment of the bending press according to the invention according to FIG. 7, reference being made to the reference to the reference of FIG. 7.

9 shows a cross-section of a section of a further preferred embodiment of a bending press according to the present invention with a die disposed on the upper side of the cheek, wherein reference should also be made here to the reference numerals used in FIGS. 7 and 8.

In the embodiment to be seen here, the bending press according to the present invention has a contouring element, namely a die 13o forming the upper cheek, which acts on the concave side 23 of the metal sheet 3 (in the case of a pipe this corresponds to the inside of the pipe to be formed), so as to support the molding process. The shape of the die 13o preferably corresponds (approximately) already to the desired contour of the metal sheet 3 on the side 23 to be concaved. Such an embodiment is always advantageous when a larger number of deformation processes with always the same contour, that is about a rounding of Tubes always the same diameter, to take place, because in this case such a contouring element 13o allows a faster manufacturing process as about the free-form by bending beam 13b and small incremental feed of the sheet 3, since in this case larger feed widths for the sheet to be formed are possible, which is the number reduced the necessary molding steps. The contouring element 13o acting on the concave side 23 of the metal sheet 3 forms the upper beam 13o at the same time. The contouring element 13o is preferably mounted replaceably on the bending press, so that different elements, such as different dies for various to be formed sheets 3 held and can be brought by means of the bending press used.

FIG. 10 shows a cross-section of a section of a conceivable embodiment of a bending press according to the present invention with a die arranged on the upper cheek and cheek cheek, reference being again made to the reference numerals used in FIGS. 7, 8 and 9. In the form of embodiment to be seen from here, the bending press according to the present invention also includes die 13b, which is arranged from outside on the convex side of the metal sheet 3 (in the case of a pipe this corresponds to the outside of the pipe to be formed). The shape of the die 13b here corresponds approximately to the desired contour of the metal sheet 3 on the convex side of the sheet 3. The arranged on the convex side of the metal sheet 3 die 13b here also forms the bending beam 13b. However, it should be noted that the attachment of a die on the convex side of the sheet metal sheet 3 usually not contouring effect and is therefore obvious only in exceptional cases, such as when no kink-free impression should be possible only on the counter-13o

Claims

Title: Bending press for metal sheetsPatent claims

1. Bending press (11) for metal sheets (3) with

a machine frame (12) having a cheek assembly (13) in the machine frame (12) in the longitudinal extent in approximately mutually parallel upper cheek (13o) and lower cheek (13u),

that in the working and insertion area (14) of the metal sheet (3) and in cross-section to the longitudinal extent of the cheeks (13) is designed approximately crescent-shaped, wherein the lower (13u) and upper cheek (13o) form the end points of the open sickle and

a bending cheek (13b) for bending the metal sheet (3) disposed inside the sickle,

wherein an actuator (15a, 15b) or a plurality of actuators (15a, 15b) is or are provided, which or the bending frame (13b) on the one hand and the machine frame (12) or a part thereof on the other hand relatively able or able to deliver what the Bending the sheet (3) allows.

Sheet metal bending press (11) according to claim 1, characterized in that the lower (13u) and upper (13o) cheeks forming the open sickle end points are in the transverse direction. section and viewed in the vertical projection on a horizontal, staggered to each other.

3. bending press (11) for metal sheets (3) according to claim 1 or 2, characterized in that the bending cheek (13 b) is arranged on the underside of the machine frame (12) and the actuator (15 a, 15 b) or the actuators (15 a, 15 b) the bending cheek (13b) on the one hand and the upper cheek (13o) on the other hand able to deliver relative to each other or able.

4. bending press (11) for metal sheets (3) according to one of claims 1 to 3, characterized in that the bending cheek (13 b) is arranged on the upper side in the machine frame (12) and the actuator (15 a, 15 b) or the actuators (15 a, 15b) on the other hand, the bending cheek (13b) on the one hand and the lower cheek (13u) on the other hand relatively able or able to deliver against each other.

5. bending press (11) for metal sheets (3) according to one of claims 1 to 4, characterized in that the bending cheek (13b) by means of the actuator (15a, 15b) or the actuators (15a, 15b) relative to the machine frame (12) or a part of it is movable.

6. bending press (11) for metal sheets (3) according to claim 5, characterized in that the bending cheek (13 b) in the vertical direction (18) relative to the machine frame (12) or a part thereof is movable.

7. bending press (11) for metal sheets (3) according to claim 5 or 6, characterized in that the bending cheek (13 b) in the horizontal direction (19) relative to the machine frame (12) or a part thereof is movable.

8. bending press (11) for metal sheets (3) according to one of claims 5 to 7, characterized in that the bending cheek (13 b) about an axis (21) is pivotally mounted.

9. bending press (11) for metal sheets (3) according to one of claims 1 to 8, characterized in that at least one actuator (15b) or more actuators (15b) is provided or are the or the upper beam (13o) on the one hand and the lower cheek (13u), on the other hand, are able or able to deliver relative to one another.

10. bending press (11) for metal sheets (3) according to claim 9, characterized in that the actuator (15 b) or the actuators (15 b) is arranged at least on the upper cheek side or are.

11. bending press for sheet metal plates according to claim 9 or 10, characterized in that the actuator (15 b) or the actuators (15 b) is arranged at least also unterangenseitig or are.

12. bending press (U) for sheet metal panels (3) according to any of Anspüche 9, 10 or 11, characterized in that at least one actuator (15 b) or actuators (15 b) is arranged or are that he or she the Upper cheek (13o) via a function acting as a lever, pivotally mounted machine frame part (16) able to deliver relative to the lower cheek (13u) or assets.

13. bending press (11) for metal sheets (3) according to one of claims 9 to 12, characterized in that at least one actuator (15 b) or actuators (15 b) is arranged or are that he or she the lower beam (13 u ) via a functioning as a lever, pivotally mounted machine frame part relative to the upper cheek (13o) able to deliver or able.

14. bending press (11) for metal sheets (3) according to one of claims 1 to 13, characterized in that at least one actuator (15 a, 15 b) is designed as a hydraulic actuator, preferably as a hydraulic cylinder.

15. bending press (11) for metal sheets (3) according to one of claims 1 to 14, characterized in that the bending press (11) has a contouring element which engages the concave side to be bent (24) of the metal sheet (3).

16. bending press (11) for metal sheets (3) according to claim 15, characterized in that on the concave side to be bent (24) of the metal sheet (3) attacking contouring element on the upper beam (13o) is arranged or the upper beam (13o) forms.

17. Bending press for metal sheets according to claim 15 or 16, characterized in that the concave side to be bent (24) of the metal sheet (3) attacking contouring element on the lower cheek (13u) is arranged or the lower cheek (13u) forms.

18. bending press (11) for metal sheets (3) according to claim 15, 16 or 17, characterized in that on the concave side to be bent (24) of the metal sheet (3) attacking contouring element on the bending cheek (13 b) is arranged or Bending cheek (13b) forms.

19. bending press (11) for metal sheets (3) according to any one of claims 15 to 18, characterized in that on the concave side to be bent (24) of the metal sheet (3) attacking contouring element of the bending press (U) is replaceable.

20. bending press (11) for metal sheets (3) according to any one of claims 1 to 19, characterized in that the longitudinal extent of the cheeks (13) is more than 4 m.

21. bending press (11) for metal sheets (3) according to any one of claims 1 to 20, characterized in that the longitudinal extent of the cheeks (13) is more than 10 m.

22. bending press (11) for sheet metal plates (3) according to one of claims 1 to 21, characterized in that a feed and or retraction means (20) is provided which the insertion and / or the withdrawal of the metal sheet in the or from the bending press (11) is used.

23. bending press (11) for metal sheets (3) according to claim 22, characterized in that the supply and / or retraction device is designed as a roller assembly (20).

24. bending press (U) for metal sheets (3) according to claim 22 or 23, characterized in that the supply and or retraction device also serves as a holding device for fixing the metal sheet (3) during the bending process.

25. Use of a bending press (11) according to one of claims 1 to 24 for rounding a metal sheet (3), characterized in that the metal sheet (3) is rounded by at least 90 ° at least one sheet edge.

26. Use of a bending press (11) according to one of claims 1 to 24 for rounding a metal sheet (3) according to claim 25, characterized in that the metal sheet (3) is rounded at two opposite edges by at least 90 °.

27. Use of a bending press (11) according to one of claims 1 to 24 for bending a multilayer metal sheet (3), characterized in that the metal sheet (3) is always bent simultaneously over the entire length to be machined.