EP2017020A2 - Method and bending machine for compensating the deflection of components of this bending machine - Google Patents

Abstract

The method involves strongly displacing wedges (5, 6), which are adjustable relative to each other, relative to each other depending on degree of compensation or embossing. Force is exerted before the displacement, and the wedge (5) is balanced or raised. The relative displacement is accomplished and then unloading or lift force is decreased or reversed or stopped. The force is applied for unloading or lifting the wedges mechanically, hydraulically, pneumatically or magnetically by air, gas or liquid introduced under or between the wedges. An independent claim is also included for a bending machine comprising wedges.

Description

The invention relates to a method for compensating the bending of parts of a bending machine, in particular for crowning table and / or ram and / or tools, wherein relatively movable wedges are shifted more or less relative to each other depending on the extent of the desired compensation or crowning.

The invention further relates to a bending machine, in particular stamping press or folding machine, with a bending tool, in particular with a punch or with a bending cheek, and with a counterpart such as die or die or lower tool with hold-down, wherein means for compensating for the bending of parts of this bending machine, in particular a crowning device, with superimposed, relative to each other differently adjustable or displaceable wedges or wedge pieces is provided, in particular for carrying out the method mentioned above.

As is known, in bending machines, the bending forces over the entire length of the workpiece to be bent act differently strong, so that a workpiece after the bending process over its entire length can have different angles. The bending force actually acts the same over the entire length, but due to the machine construction leads to different deformations on the machine itself, which are also transferred to the workpiece in such a way that the bending angle over the entire length of the workpiece does not turn out the same. It is known to counteract this phenomenon with a compensation.

It is off DE 196 81 349 T1 a corresponding bending machine is known, in which the initially defined method is used. Fig. 7 This prior publication shows a press brake, in which wedges to compensate for deflections can be adjusted relative to each other, such as page 15 last paragraph and page 16 of DE 196 81 349 T1 is described. In this case, for this compensation of the deflection or for the crowning relative to each other differently slidable wedge pieces are provided, so that these individual wedge pieces can also be shifted by different amounts relative to each other and cause corresponding differences in height, so can counteract deflections to varying degrees. Thus, the different degrees of deformation can also be counteracted to different degrees.

The mutual displacement of such wedges or wedge pieces, however, requires high forces and can be very stiff especially with impurities that can not be ruled out on such bending machines, so that correspondingly strong drives or motors are required for these adjustment movements, which have a correspondingly large space requirement. Above all, this results in the high weight of the tool with the workpiece at a corresponding underlying wedge assembly large forces, which requires high driving forces for the adjustment movements of the wedges even with favorable friction conditions.

It is therefore an object to provide a method of the type defined and also an aforementioned bending machine with relatively adjustable individual wedges, with relatively low driving forces to adjust one part should be sufficient relative to the other.

To solve this seemingly contradictory task, the method mentioned above is characterized in that before the displacement of the wedges or a force is exerted by the at least one of the wedges is relieved or raised, that thereafter carried out the relative displacement and then the discharge or Lifting force is reduced or canceled or switched off.

By relieving or lifting one of the wedges, the mutual friction is reduced or even eliminated, so that then the displacement of an associated wedge or wedge piece is correspondingly smooth. Accordingly, resulting in correspondingly lighter and smaller drives with less space.

The force for relieving or lifting the wedge (s) may be applied mechanically and / or hydraulically and / or pneumatically and / or magnetically and / or through air or gas or liquid introduced below or between the wedges. Thus, virtually any means and measures can be used individually or in combination, to bring about the relief of the wedge to be moved.

It is particularly advantageous if an upper wedge in use position relieved or raised against the underlying wedge and then moved the lower wedge and then frees the upper wedge from the lifting force and / or lowered to the lower wedge. If the upper wedge is lifted with a pair of wedges, the wedge underneath can be moved accordingly smoothly. After lowering the upper wedge then results in the desired compensation of a supported on this wedge assembly part of the bending machine, for example, the overlying tool.

Even smoother is the setting of the respective wedges, when both relieved and / or lifted a pair of forming wedges, then placed in a relatively shifted position and then frictionally and / or non-positively fixed in the use position. In this way, even the friction of an example lower wedge relative to its normal contact surface can be reduced or canceled.

The bending machine defined at the outset can be characterized by the fact that, on the upper and / or lower wedge or wedge piece, a lifting device compensating for at least part of the weight of the respective wedge or wedge piece engages during the relative displacement of the superimposed wedge pieces or wedges is effective and in use of the bending machine ineffective or off.

The lifting device can thus be designed or dimensioned so that it lifts the entire weight of a wedge with a resting structure on it, which is a particularly smooth adjustment of the underlying wedge allowed, after which the upper wedge can be lowered again. Alternatively, however, the upper wedge can be supported and relieved by means of the lifting device, but the lower wedge still apply the rest of the lifting force during its displacement. Especially in the former case, such a small drive is sufficient for the displacement of the lower wedge that this can be accommodated in an advantageous manner, possibly even within the wedge bearing, for example, directly under this wedge or its bed in a corresponding recess. In any case, it is possible to make the mutual friction of the relatively movable wedges so small that small driving forces are sufficient for this displacement of the wedges or wedges. Above all, this also reduces or abolishes the mutual initial adhesion of the wedges at the beginning of the mutual displacement.

The lifting force of the lifting device can be adjustable, adjustable and / or off and on. Thus, the best possible adaptation to different operating conditions is possible.

In a preferred embodiment, the lifting device may exert a force exerting the weight of the wedge acted upon by it - optionally with superstructures above it - and may be provided for lifting the wedge or wedge piece acted upon by it, in particular by a predetermined amount. Stiction and also a sliding friction between the two wedges is practically avoided.

The wedge slopes provided between the two wedges which can be adjusted relative to one another can be selected such that the wedges rest on one another in the position of use with self-locking. At very steep wedge angles, the vertical force acting on these wedges could lead to an unwanted displacement of the wedges and thereby completely or partially nullify the desired crowning or compensation of deformations. By choosing the wedge angle in the field of self-locking this can be prevented without having to provide additional means and measures, so that an unwanted wedge displacement could be avoided.

In order to effect or compensate for the greatest possible deformation or crowning on the shortest possible path through the displacement of the parts relative to one another, the wedge surface can extend at a greater angle than the self-locking angle, in particular at an angle greater than 6 °, and the surfaces interacting with one another the wedges or wedge pieces can be roughened in such a way that even with such a larger wedge angle self-locking exists or is present.

By a steeper wedge angle already satisfies a smaller relative displacement of the wedges or wedge pieces to each other to allow a correspondingly large compensation of unwanted deflections, so that the entire arrangement can be designed to save space in the direction of the wedges. The self-locking can still be achieved by a corresponding greater friction between the wedges.

The lifting device may have at least one or two plungers or spindles or actuators or the like which are movable transversely to the extent of the wedges or wedge surfaces and which act in particular on the respective wedge pieces located at the top. In this way, the lifting device can be designed very simple, with at least two plungers are preferred to the lifting force as evenly as possible to transfer to the wedge to be lifted.

The respective lower wedge piece of the crowning device can have at least one or more oblong holes oriented in the direction of displacement, through which one or more plungers or the like act on a wedge piece located above it. Thus, the lower wedge piece can be adjusted relative to the passing through ram or the like actuating means in the desired manner, because the one or more slots are oriented in the direction of displacement, so the relative movement to the fixed rams or the like is easily possible.

An overhead wedge piece acting plunger or the like can also attack bypassing the lower wedge on this upper wedge or wedge piece, so that at this lower wedge piece no slots or long slots are required. For example, the plunger may be guided past the end faces of the underlying wedge piece and act on the upper wedge piece, wherein the lower wedge piece has enough space between the plungers for the sliding movement due to its shorter length.

A further advantageous embodiment of the invention may provide that the lifting device or belonging to it plunger or actuating means on the one hand act on the upper wedge from below and on the other hand engage with a paragraph or collar or plate in the starting position by far the lower wedge so that when pressed the plunger or the like in the stroke direction first of the upper and then the lower wedge - from the support surface - raised and thereby all wedges of the shaker are lifted from them in the initial position contacting surfaces. Accordingly, they can then easily relative to each other or the lower wedge are moved relative to the upper wedge and placed in a position in which the compensation of bending of parts of a bending machine can be done in an optimal manner.

An embodiment of the invention may provide that the lifting device is designed as an air or medium cushion and that supply lines for the air or the medium are provided to the parting surfaces between the wedges and / or between the lower wedge and its support, wherein the wedges in a they are mounted medium-tight enclosing housing or sub-housing. By brought especially between the wedges medium these can also be lifted from each other. Thus plungers can be saved. It is particularly easy to mitzubenutzen the medium used to lift the upper wedge also for lifting the lower wedge to make the mutual adjustment of the two wedges friction or smooth.

A combination is also conceivable in that the lifting device has a mechanical part, in particular for the upper wedge, and an air or medium cushion for the lower wedge. Thereby, the advantages of the different means for lifting the wedges can be conveniently combined. Above all, the greater force can act on the upper wedge via a mechanical part, so that for the additional lifting of the lower wedge a medium cushion is sufficient in which a lower pressure is required than when the upper wedge are raised with a structure thereon would.

To move the relieved or lifted wedges relative to each other can be provided from the outside to these attacking and / or arranged inside the wedges actuators. There sufficient for the displacement relatively low forces, the space inside the wedges for these actuators may even be large enough.

For example, one of the wedges or wedge pieces may include a drive motor that cooperates with a threaded spindle supported on an inner wall of the wedge receiving housing.

But it is also possible that in the wedge, a working cylinder is arranged and the cylinder itself or the piston rod from the wedge against the direction of displacement extendable and is supported on a wall or a projection of the wedge housing receiving.

Of course, however, the corresponding actuators may also be arranged outside the wedges and act on these in each case from the outside in the direction of displacement.

The lifting device for performing the compensation of deflections or the crowning can be actuated before or during a bending operation. Preferably, the actuation is prior to a bending operation, because during the bending process, a correspondingly greater force against the bending force is used to relieve or lift the wedge pieces or. On the other hand, it may also be expedient to perform the displacement of the wedges only during the bending process, if appropriate control devices are provided which allows an adjustment of the respective wedge adjustment to the occurring deflection.

An expedient structural embodiment of the bending machine according to the invention can provide that in each case at least one pair of relatively adjustable wedges or Wedge pieces is arranged in a housing part and a plurality of such housing parts modular and continuing as a crimping device are composing. This allows the use of the device to compensate for deflections or to camber to different machine sizes easily adapt.

This equipment differently sized benders with the inventive curving device is particularly versatile applicable when each having at least one pair of wedge pieces containing a plurality of modular housing parts each have a matching dimension. Depending on the size of the machines to be equipped, the user can then combine more or less such modular housing parts and thereby design differently sized devices in the increments of the respective length dimension.

The direction of the sliding movement of the at least one wedge or wedge piece can be oriented transversely or at right angles to the bending line and / or for the orientation of the bending tool, in particular designed as a die and male or punch. Although the wedges and wedge pieces could also be oriented and displaceable in the direction of the bending line, but with a use of transverse to the bending line oriented and movable wedge pieces, especially with relatively narrow wedge pieces a very accurate adaptation to different deflections by different degrees of displacement of the individual wedges and Wedge pieces can be achieved.

Although in a lifting device usually their arrangement below a part to be lifted is common or appropriate, in a modified embodiment of the bending machine according to the invention, the lifting device also above the wedges or wedge pieces can be arranged and the upper wedge can be pulled up to relieve or lift off the lower wedge. By such an arrangement, different space conditions can be taken into account on a respective bending machine.

For example, the upper wedge may in particular be positively connected to a cover of the wedges or the housing and this cover be movable upwards. In this case, the connection can be made for example via a sliding or T-slot, so that the upper wedge is not only liftable, but also in the desired direction is also displaced. It would also be conceivable for the cover to be liftable from below, as a result of which the wedge, which is displaceable with it in the displacement direction but which is positively connected, would also be relieved or liftable.

The lifting device arranged in particular above the wedge arrangement may have a support in relation to the lower wedge or the housing, which can be acted on by a force to lift the cover and / or the upper wedge and is designed in particular as a piston, spindle or actuator. If, for example, pressure is exerted on this piston with a piston having a piston inside the cover, while the piston rod is supported on the lower wedge and / or the housing, this leads to the corresponding lifting movement of the cover and thus of the upper wedge connected to it that this can then move in its positive guide relative to the cover in the desired position relative to the lower wedge.

The upper wedge may be shorter than the underlying, in this case non-displaceable wedge and in the direction of displacement of the upper wedge, a clearance for the displacement of the upper wedge may be provided. It will be appreciated that the increase in the cross-sectional height of the two superimposed wedges can be effected either by displacement of the lower wedge relative to the upper or by displacement of the upper wedge relative to the lower or possibly also by displacement of both wedges relative to each other.

In or on the - to the lower wedge displaceable - upper wedge, a working cylinder, a spindle, an actuator or other actuating means for its displacement relative to the other wedge, in particular transverse to the bending line, may be provided. Thus, the means for displacing the wedge may be designed in an analogous manner, such as a displacement device for displacing the lower wedge when it is shorter and can be moved.

Serving for raising or pulling up the upper wedge lifting device may be arranged in or on the upper cover of the housing and serving for lifting push rods, tappets, threaded spindles or the like actuating means can enforce the upper wedge on oriented in the direction of slotted holes or on the upper wedge each end in particular be passed by a distance.

Especially when combining one or more of the features and measures described above results in a crowning or bending machine with a crowning, in which the mutual adjustment of serving to compensate for deflections or crowning wedges is smooth, so that correspondingly small and space-saving drives for this Adjusting movements are sufficient.

Fig. 1

eine schaubildliche Ansicht einer Biegemaschine mit einer nur über einen Teil der Erstreckung der Bie- gemaschine reichenden Matrize oder Gesenk und einer Patrize oder einem Stempel,

Fig. 2

in vergrößerter Darstellung eine im Bereich der Ma- trize angeordnete Einrichtung zur Kompensation der Durchbiegung der Matrize während des Biegevorganges mit relativ zueinander quer zur Biegelinie ver- stellbaren Keilen,

Fig. 3

einen Querschnitt gemäß der Schnittebene C in Fig. 2,

Fig. 4

einen Querschnitt gemäß der Schnittebene A in Fig. 2,

Fig. 5

eine abgewandelte Ausführungsform, bei welcher Zu- führkanäle in den Bereich unter und zwischen den Keilen vorgesehen sind, um ein Medium unter Druck einzuführen und dadurch die Keile anzuheben,

Fig. 6

eine der Fig. 4 entsprechende Darstellung, wobei Stößel zum Anheben sowohl des oberen als auch des unteren Keils vorgesehen sind,

Fig. 7

eine den Fig. 4 und 6 entsprechende Darstellung, bei welcher Stößel zum Anheben des oberen Keils ge- genüber dem unteren Keil außerhalb dieses unteren Keils angeordnet sind,

Fig. 8

einen Querschnitt etwa gemäß der Schnittebene B in Fig. 2, wobei zusätzlich ein in dem unteren Keil für dessen Querverstellung dienender Aktor vorgese- hen ist.

Fig. 9

eine der Fig. 8 entsprechende Darstellung mit einem abgewandelten Aktor im Inneren des unteren Keils,

Fig. 10

einen Querschnitt etwa in der in Fig. 2 angedeute- ten Schnittebene A, wobei zusätzlich zu den Stößeln zum Anheben des oberen Keils Zuführkanäle für ein Medium zum Anheben auch des unteren Keils vorgese- hen sind,

Fig. 11

einen Querschnitt etwa gemäß den Fig. 8 und 9, wo- bei der Aktor zum Verschieben des unteren Keils quer zur Biegelinie außerhalb des Keils angeordnet und als Kolben ausgebildet ist,

Fig. 12

einen Querschnitt einer abgewandelten Ausführungs- form etwa in der Schnittebene C von Fig. 2, wobei die Abdeckung zusammen mit dem daran verschieblich gehaltenen oberen Keil relativ zu dem unteren Keil anhebbar ist, sowie

Fig. 13

einen Querschnitt etwa analog Fig. 9, wobei eine Einrichtung zum Verschieben des oberen Keils in diesem selbst untergebracht ist.

Hereinafter, embodiments of the invention are described in more detail with reference to the drawing. It shows in partly schematized representation:

Fig. 1

2 is a perspective view of a bending machine with a die or die extending only over part of the extension of the bending machine and with a male or a punch,

Fig. 2

on an enlarged scale, a device arranged in the region of the matrix for compensating the bending of the die during the bending process with wedges adjustable relative to one another transversely to the bending line,

Fig. 3

a cross section according to the sectional plane C in Fig. 2 .

Fig. 4

a cross section according to the sectional plane A in Fig. 2 .

Fig. 5

a modified embodiment in which feed channels are provided in the area below and between the wedges to introduce a medium under pressure and thereby lift the wedges,

Fig. 6

one of the Fig. 4 corresponding representation, wherein rams are provided for lifting both the upper and the lower wedge,

Fig. 7

a the Fig. 4 and 6 corresponding representation, in which plunger for lifting the upper wedge relative to the lower wedge outside this lower Wedge are arranged

Fig. 8

a cross section approximately according to the sectional plane B in Fig. 2 , wherein additionally provided in the lower wedge for the transverse adjustment actuator is hen provided.

Fig. 9

one of the Fig. 8 corresponding representation with a modified actuator inside the lower wedge,

Fig. 10

a cross section approximately in the in Fig. 2 indicated cutting plane A, wherein in addition to the rams for lifting the upper wedge feed channels for a medium for lifting also the lower wedge are provided hen,

Fig. 11

a cross-section approximately according to the 8 and 9 in which the actuator for displacing the lower wedge is arranged transversely to the bending line outside the wedge and designed as a piston,

Fig. 12

a cross section of a modified embodiment, for example in the sectional plane C of Fig. 2 wherein the cover is liftable relative to the lower wedge together with the upper wedge displaceably held thereon, and

Fig. 13

a cross-section approximately analog Fig. 9 in which a device for displacing the upper wedge is accommodated in this itself.

A bending machine designated as a whole by 1 is designed in the embodiment as a press bending press and has a punch 2 and a counterpart thereto, namely a die or a die 3, hereinafter also simply called die 3. The bending machine 1 has an in Fig. 2 as a whole denoted by 4 means for compensating the deflection of parts of this bending machine 1, namely a bombing on, which is also referred to below as "crowning device 4". Stamp 2 and die 3 can run over a greater length than drawn.

This crowning device 4 has approximately corresponding DE 196 81 349 T1 . Fig. 7 , arranged one above the other, relative to each other differently adjustable or displaceable wedges or wedge pieces 5 and 6, wherein on the basis of Fig. 3 to 11 it is clear that the respective upper wedge 5 only performs a lifting movement, but no movement transverse to the bending line, while the lower wedge 6 is shorter and in the receiving housing 7 for the two wedges 5 and 6 a sliding chamber 8 between its lower end face and the housing wall and thus in the direction of the arrow Pf 1 in Fig. 3 can be moved. In a known manner, a displacement of the wedge 6 in the space 8 to a lifting movement of the wedge 5, so that occurring on the die 3 too strong bending forces can be compensated.

At the same time considering the Fig. 2 and 4 to 7 and FIG. 10 shows that a lifting device compensating for at least part of the weight of the respective wedge or wedge piece 5, which will be explained in more detail below, engages in each case on the upper wedge or wedge piece 5, which during the relative not yet shown in the figures Displacement of the superimposed wedges or wedge pieces is effective and ineffective or switched off when using the bending machine 1.

In this way, it is possible that before the shift For example, the lower wedge 6 is exerted relative to the upper wedge 5 for the raising of a force by which at least this upper wedge 5 is relieved or lifted, so that the then taking place relative displacement of the lower wedge piece 6 requires little force. If the desired setting is reached, the lifting force can be reduced or turned off, so that then the wedges 5 and 6 are in the new position relative to each other and due to the shift performed overall have a greater height, so to be feared or expected too strong bends, for example compensate the die 3.

The lifting force of the lifting device can be adjustable, adjustable and / or off and on, which can be done by appropriate controls in adaptation to the machine cycle, which are not shown in detail for the sake of simplicity.

It is particularly expedient if the lifting device exerts a force exerted by the weight of the acted upon by her wedge 5 and possibly on this superstructure bodies and serves to lift the acted upon by her wedge 5 or wedge piece by a predetermined amount, so that is an upper in use position Not only relieves wedge 5 relative to the underlying wedge 6, but can even be raised at least to the desired compensating position, after which the lower wedge 6 in the direction of the arrow Pf 1 according to Fig. 3 can be moved into the space 8 without a frictional force must be overcome between the two wedges. If the upper wedge 5 is then freed again from this force, it can thus be supported again on the lower wedge 6 or lowered onto it, whereupon the two wedges 5 and 6 effect the desired compensation of a deflection in the region of the die 3 of the bending machine 1 ,

The wedge slopes are chosen at the contacting surfaces so that the wedges 5 and 6 lie on each other in the use position with self-locking so that they can not slip out of the set position later under the bending load. Optionally, the wedge surfaces can thereby run at a larger angle than the usual self-locking angle of about 6 ° when the cooperating surfaces of the wedges 5 and 6 are roughened such that even with a larger wedge angle is self-locking.

In the embodiments according to Fig. 2 . 4 . 6, 7 and 10 are provided as essential parts of the aforementioned lifting device two movable transversely to the extension of the wedges 6 plunger 9, each attacking on the overhead wedge piece 5, so in their operation from bottom to top of the upper wedge 5 in the manner already described by the lift off lower wedge 6. The respective lower wedge piece 6 of the crowning device 4 has slotted holes 10 oriented in the direction of displacement, through which the rams 9 impinge on the wedge piece 5 located above them and which, in spite of the ram 9, permit the displacement of the wedge piece or wedge 6 in the described manner and direction. The elongated holes 10 extend in the direction of displacement, so that the lower wedge 6 in spite of the plunger 9 can be easily ver or adjusted.

A modified embodiment shows Fig. 7 in which the plunger 9 acting on an upper section 5 acts, bypassing the lower wedge 6, on this upper wedge 5 or wedge piece, this being achieved in that the two plungers are respectively arranged in the region of the walls of the housing 7 and the lower one Wedge 6 between these pestles 9 is and is displaceable.

A special embodiment shows Fig. 6 in which the plunger belonging to the lifting device 9 on the one hand act on the upper wedge 5 from below and on the other hand with a paragraph or collar or plate 11, the lower wedge 6 engage in the starting position by far, so that upon actuation of the plunger 9 initially the upper and then also raised the lower wedge 6 and thereby all wedges 5 and 6 are lifted from them in the initial position-contacting surfaces, as in Fig. 6 is shown. It is clear that this then allows a particularly smooth adjustment, especially of the lower wedge 6, which in the illustration according to Fig. 6 not yet moved, but is already free and can be moved accordingly smoothly to the right in the direction of arrow Pf 1.

To the lifting device with the plungers 9 in each case includes a piston drive, which is shown schematically in the above figures, wherein the respective piston 12 engages the lower end of the respective plunger 9 directly.

In Fig. 5 a modified lifting device is shown, which is designed as an air or medium cushion, and it can be seen supply lines 13 and 14 for the air or for the medium to the separating surfaces between the wedges 5 and 6 and between the lower wedge 6 and its support surface, wherein the Lines 13 are also guided by the lower wedge 6 upwards and can conduct air between the two wedges 5 and 6, while the leads 14 act on the lower wedge 6 from the bottom, so that at sufficient pressure, the mentioned air or media cushion the Can lift wedges 5 and 6. Here, too, the wedges 5 and 6 are mounted in the enclosing housing 7 or a sub-housing, which is medium-tight in this case.

Conceivable and in Fig. 10 indicated is still the possibility that the lifting device has a mechanical part, namely plunger 9 for the upper wedge 5 and leads 14 for an air or medium cushion for the lower wedge 6. Thus, the mechanical with the pneumatic or hydraulic lifting can also be combined.

To move the relative to each other relieved or raised wedges from the outside are arranged on these attacking or arranged inside the wedges actuators, in the embodiment, each of the lower wedge 6 after lifting the upper wedge 5 is displaced and therefore the actuators explained below on this Attack wedge 6

Fig. 8 shows a solution with a located in the lower wedge 6 spindle motor 15 whose rotation relative to the fixed spindle 16 leads to the displacement of the wedge 6.

Fig. 9 shows a arranged in the interior of the lower wedge 6 or molded cylinder 17 with a piston 18 supported on a wall of the housing, so that at a corresponding pressure of the lower wedge 6 can be moved.

A reverse arrangement shows Fig. 11 in which the piston 18 is arranged in an outer cylinder 17 and the piston rod acts through the wall of the housing 7 through the lower wedge 6.

Conveniently, these different actuators are in each case in areas of the wedges 5 and 6, the are not provided with the plungers 9, so that the raising of the upper wedge 5 and the displacement of the lower wedge 6 do not lead to mutual interference or collisions.

In Fig. 1 is still indicated that in each case at least one pair of relatively adjustable wedges or wedge pieces 5 and 6 arranged in a housing part 7 and a plurality of such housing parts 7 may be modular and continuous with each other under a top cover 19 as a shaker 4, wherein the respective at least one Pair of wedge pieces 5 and 6 containing a plurality of modular composite housing parts 7 in the exemplary embodiment each have a matching dimension or length, so that the crowning device 4 can be adapted to different sized bending machines 1.

In addition, the degree of compensation of a deflection can be adjusted relatively well, since in each housing part 7 an individual or different, adapted to the requirements relative adjustment of the wedges 5 and 6 can be performed to each other, wherein advantageously the displacement of the lower wedge 6 is smooth because during this displacement, the upper wedge 5 is at least relieved or preferably raised. As already mentioned, however, both wedges can be relieved or lifted, after which the displaced position is brought about, in which then the wedges 5 and 6 are again frictionally and / or non-positively fixed in the position of use and can now compensate for corresponding bends.

It is clear from the drawings and in particular when the figures are considered together that in the exemplary embodiments illustrated the direction Pf1 of the displacement movement of the respective displaceable wedge or wedge piece is transverse or is oriented at right angles to the bending line and the orientation of the bending die formed from die 3 and male or stamp 2, since even relatively short wedges and wedge pieces 5 and 6 can be sufficient for a corresponding compensation of a deflection. In this way, a relatively large number of wedges 5 and 6 can be accommodated in the direction of the bending line next to each other, so that a correspondingly sensitive compensation of deflections is possible.

In the FIGS. 12 and 13 is a modified compared to the embodiments described above embodiment is shown, in which the lifting device is disposed above the wedges or wedge pieces 5 and 6. It is provided that the upper wedge 5 for relieving or lifting of the lower wedge 6 is pulled up and then in the direction of arrows Pf2 displaced and adjustable. It is indicated that the upper wedge 5 positively connected to the cover 19 of the wedges or the housing 7 and this cover 19 is movable upward, wherein they in the FIGS. 12 and 13 already shown lifted relative to the housing 7. The upper wedge 5 is slidably held on the liftable cover 19, that is, he can, for example, with a fitting 20 engage in a provided on the underside of the cover 19 T-shaped groove, so that it is connected to the cover 19 in lifting direction and yet is displaceable relative to her.

You can see in FIG. 12 in that the lifting device has a support with respect to the lower wedge 6 and thereby also with respect to the housing 7, which can be acted on by a force for lifting the cover 19 and the upper wedge 5. This support is designed as a piston 21 with piston rod 22, but could also be a spindle or other actuator to a corresponding application of force to raise the associated cover 19. In FIG. 12 can be seen within the cover 19, the piston 21 within a arranged in the cover 19 cylinder opening 23, so that upon pressure on the piston rod 22 side facing away from the piston 21, the cover 19 is moved together with the upper wedge 5 upwards.

The upper wedge 5 is in the embodiment according to the FIGS. 12 and 13 - In contrast to the above-described embodiments - shorter than the underlying wedge 6 and in the direction of the upper wedge 5 in turn a space 8 for the displacement of the upper wedge 5 is provided within the housing 7.

In FIG. 13 is indicated that analogous to the arrangement according to FIG. 9 in or on the upper wedge 5, a working cylinder 17 may be provided to him relative to the other wedge 6 - in particular transverse to the bending line - to move, the shift in turn with the aid of a piston 18 analogous to the arrangement and the description of FIG. 9 he follows. But piston 18 and cylinder 17 could also be analog Fig. 11 be arranged on the outside of the housing 7.

Since the serving for lifting or pulling up the upper wedge 5, according to the embodiment FIG. 12 is arranged substantially by the piston 21 formed in the cylinder 23 lifting device in the upper cover 19 of the housing 7, it requires only little space and serving for lifting, acting as a push rod piston rod 22 is according to FIG. 12 on the upper wedge 5 in each case past the end with a sufficient distance to allow its movements in the direction of the arrow Pf2. But it would also be possible analogous to the above-described embodiments to provide an upper wedge 5 with slotted holes 10 through which the Push rods or piston rods 22 could run.

To compensate for the deflection of parts, such as the die or the lower tool 3, the bending machine 1, in particular for crowning relatively movable wedges are more or less displaced relative to each other depending on the extent of the desired compensation or crowning, the upper wedge in the direction of displacement has larger size and is not adjusted in the rule, but only raised, while the lower, shorter in the direction of displacement wedge causes the desired compensation by its adjustment. In this case, a force is exerted by the displacement, in particular by the upper wedge 5 is relieved or raised, so that the subsequent successful displacement of the lower wedge 6 can be smooth and with low driving force.

Claims (29)

Method for compensating the deflection of parts of a bending machine (1), in particular for crowning table and / or ram and / or tools (3), wherein relatively movable wedges (5, 6) depending on the extent of the desired compensation or crowning more or less strongly relative to each other, characterized in that prior to the displacement, a force is exerted by the at least one of the wedges (5) is relieved or raised, that thereafter carried out the relative displacement and then the relief or lifting force reduced or canceled or is turned off. A method according to claim 1, characterized in that the force for relieving or lifting the / the wedges mechanically and / or hydraulically and / or pneumatically and / or magnetically and / or by under or between the wedges (5, 6) introduced air or gas or liquid is applied. A method according to claim 1 or 2, characterized in that in the position of use upper wedge (5) relative to the underlying wedge (6) relieved or raised and then moved the lower wedge (6) and then freed the upper wedge from the power and / or lowered onto the lower wedge. Method according to one of claims 1 to 3, characterized in that both wedges relieved and / or raised, then brought into a position shifted relative to each other and then frictionally and / or non-positively fixed in the position of use. Bending machine, in particular press brake or bending machine, with a bending tool, in particular with a punch (2) or with a bending beam, and with a counterpart such as die (3) or die or lower tool with hold-down, wherein means (4) for compensating the deflection of Parts of this bending machine (1), in particular a crowning device (4), arranged with one another, relative to each other differently adjustable or displaceable wedges or wedge pieces (5, 6) is provided, in particular for carrying out the method according to one of claims 1 to 4, characterized in that on the upper and / or lower wedge or wedge piece (5) an at least a part of the weight of the respective wedge or wedge piece (5) compensating lifting device acts, during the relative displacement of the superimposed wedge pieces or wedges effective and in use the bending machine (1) inoperative or switched off t is. Bending machine according to claim 5, characterized in that the lifting force of the lifting device is adjustable, adjustable and / or off and on. Bending machine according to Claim 5 or 6, characterized in that the lifting device exerts a force exceeding the weight of the wedge (5) acted on by it and is provided for lifting the wedge (5) or wedge piece acted upon by it, in particular by a predetermined amount. Bending machine according to one of claims 5 to 7, characterized in that the wedge slopes are chosen so that the wedges (5, 6) lie in the position of use with self-locking on each other. Bending machine according to one of claims 5 to 8, characterized in that the wedge surface at an angle greater than the self-locking angle, in particular at an angle greater than 6 °, and the cooperating surfaces of the wedges (5, 6) and wedge pieces are roughened in such a way in that there is self-locking even with a larger wedge angle. Bending machine according to one of claims 5 to 9, characterized in that the lifting device has at least one or two transversely to the extension of the wedges (6) or wedge surfaces movable plunger (9) or spindles or actuators or actuating means, in particular to the respective upper wedge piece (5) attack. Bending machine according to one of claims 5 to 10, characterized in that the respective lower wedge piece (6) of the crowning device (4) at least one or more oriented in the direction of displacement slots (10) through which one or more plunger (9) or the like apply over this wedge piece (5). Bending machine according to one of claims 5 to 11, characterized in that an upper wedge piece (5) acting on ram (9) or the like, bypassing the lower wedge (6) on this upper wedge or wedge piece (5) attack. Bending machine according to one of claims 5 to 12, characterized in that the lifting device or belonging to it Tappet (9) or the like on the one hand act on the upper wedge (5) from below and on the other hand with a paragraph or collar or plate (11) in the starting position at a distance below the lower wedge (6) engage below, so that upon actuation of the plunger (9 ) or the like initially raised the upper and then the lower wedge (6) and thereby all wedges (5, 6) are lifted from them in the initial position contacting surfaces. Bending machine according to one of claims 5 to 13, characterized in that the lifting device is designed as an air or medium cushion and that feed lines (13, 14) for the air or the medium to the parting surfaces between the wedges (5, 6) and / or are provided between the lower wedge (6) and its support, wherein the wedges (5, 6) are mounted in a medium-tightly enclosing housing (7) or sub-housing. Bending machine according to one of claims 5 to 14, characterized in that the lifting device has a mechanical part in particular for the upper wedge (5) and an air or medium cushion for the lower wedge (6). Bending machine according to one of claims 5 to 15, characterized in that are provided for displacing the relieved from each other or lifted wedges from the outside of these attacking or arranged inside the wedges actuators. Bending machine according to one of claims 5 to 16, characterized in that one of the wedges (6) or wedge pieces includes a drive motor (15) which is provided with a housing (7) receiving on an inner wall of the wedge. supported threaded spindle (16) cooperates. Bending machine according to one of claims 5 to 17, characterized in that in the wedge, a working cylinder (17) is arranged and the cylinder itself or the piston rod (18) from the wedge (6) against the direction of displacement extendable and on a wall or a projection of the wedge receiving housing is supported. Bending machine according to one of claims 5 to 18, characterized in that the lifting device for performing the crowning before or during a bending operation is actuated. Bending machine according to one of claims 5 to 19, characterized in that in each case at least one pair of relatively adjustable wedges or wedge pieces (5, 6) in a housing part (7) is arranged and a plurality of such housing parts (7) modular and continuing each other as a crowning device (4) are composable. Bending machine according to one of claims 5 to 20, characterized in that the at least one pair of wedge pieces (5, 6) containing a plurality of modular housing parts (7) each having a matching dimension. Bending machine according to one of claims 5 to 21, characterized in that the direction of the sliding movement of the at least one wedge or wedge piece (5) transversely or at right angles to the bending line and / or the orientation of the particular die (3) and male or punch (2) formed bending tool is oriented. Bending machine according to one of claims 5 to 22, characterized in that the lifting device above the wedges or wedge pieces (5, 6) is arranged and that the upper wedge (5) for relieving or lifting of the lower wedge (6) is hochziehbar. Bending machine according to claim 23, characterized in that the upper wedge (5) in particular positively connected to a cover (19) of the wedges or of the housing (7) and this is movable upwards. Bending machine according to claim 23 or 24, characterized in that the upper wedge (5) is slidably held on the liftable cover (19). Bending machine according to one of claims 23 to 25, characterized in that the lifting device has a support against the lower wedge (6) or the housing (7), which for lifting the cover (19) and / or the upper wedge (5) a force can be acted upon and in particular as a piston (21), spindle or actuator is formed. Bending machine according to one of claims 23 to 26, characterized in that the upper wedge (5) is shorter than the underlying wedge (6) and in the direction of displacement of the upper wedge (5) has a free space (8) for the displacement of the upper wedge (5). 5) is provided. Bending machine according to one of claims 23 to 27, characterized in that in or on the upper wedge (5), a working cylinder, a spindle or an actuator for the displacement of which is provided relative to the other wedge, in particular transversely to the bending line. A bending machine according to any one of claims 23 to 28, characterized in that the lifting means for lifting or pulling up the upper wedge (5) is arranged in or on the upper cover (19) of the housing (7) and for lifting push rods, piston rods , Plunger, threaded spindles or the like actuating means to enforce the upper wedge (5) at oblong holes or on the upper wedge (5) are guided past each end.

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