EP0894550B1 - Bending machine for multiple bending - Google Patents

Description

The invention relates to a bending machine for multi-sided bending of plate-shaped workpieces such as sheets or blanks different dimensions, with a particular horizontal as a workpiece support bending strip and with a as Hold-down tool on one against the workpiece adjustable upper beam, which tool from several, the bending line forming segments is composed, each with their Side surfaces face each other and / or lie against each other, as well as with at least one performing the bending movement Bending beam.

Such a bending machine is, for example, from EP-0 258 204 B1 known. For setting to different dimensions of the plate-shaped workpieces to be machined are Segments of the hold-down device individually using an adjusting rod adjustable, each segment individually with this adjustment rod is jammed. The adjustment movement also includes the Segments taken and moved, seen in the direction of adjustment arranged in front of such a coupled or jammed segment are and are concerned with this.

This results in a considerable effort to select individual segments or groups of segments depending on the dimensions of the machined To be able to adjust workpieces, because every segment must at least its own clamp coupling with associated control have in order to be able to couple it optionally with the adjusting rod. These clamping couplings have clamping pieces that in Clamping position are loaded by clamping springs, the force of an actuating cylinder must be released when the clamping is released shall be. Corresponding bores are for the actuating cylinders required for a pressure medium. Furthermore, a Switching valve for the control, which in turn requires one Connection to its control needed. This also results in one certain minimum dimensions of the individual segments around this Clamping coupling for connecting to the adjustment rod included can. In addition, the dimensions of the workpieces can only be varied to the extent specified by the segments.

There is therefore the task of a bending machine at the beginning to create the type mentioned that is easy to use and before everything is under construction and yet a continuous adjustment to allows different dimensions of workpieces.

The solution to this seemingly contradictory task is to that the tool has a first group of segments that are interchangeable and / or at least one transverse to the bending line and a slot running parallel to its side surfaces have such slot width and slot depth that a bent edge of a workpiece in this slot fits that Tool has a second set of segments pointing in the direction the bending line relative to each other and to the segments of the first Group are adjustable, and that the sum of the maximum adjustment of all segments belonging to the tool, at least those in the direction the bending line width of an interchangeable segment or the distance of a slot from the side surface or surfaces of a once slotted segment and / or a neighboring slot of a multiple slotted segment. It should be mentioned that a single interchangeable segment may suffice to cover this Realize invention.

The combination of features mentioned above makes it possible to use simple means a continuous adjustment to different dimensioned workpieces - naturally within the scope of the total available Segments and their dimensions. For example starting from a position where the relative to each other adjustable segments lie side by side, a continuously larger workpiece can be machined by this Segments all more and more up to their maximum adjustability be moved apart. If this maximum is reached, a interchangeable segment with the corresponding total adjustment range Width can be added and the adjustable segments can be moved towards each other again, so that starting from this Then the tool enlargement again continuously by moving apart of the adjustable segments reaches a next dimension level can be, but again stepless.

Conversely, a reduction in size by removal of an interchangeable segment with adjustable ones moved apart Segments can be set. All of this can be done very easily and can be done quickly because no mechanical coupling preselected and controlled segments is required. It will simply all adjustable segments uniformly and simultaneously disguised, be it in their spread or spread apart Position, be it in the position in which they are with their side faces lie next to each other, be it an intermediate position. Hence it follows in a simple way a continuous adjustment to any dimensioned Workpieces.

Because of the interchangeable and / or slotted segments a coarse grid for different sized workpieces provided, because curved edges can be inserted into the slots of the workpieces are inserted when bending the other edges. Due to the above-described adjustability of the other segments the stepless adaptation to intermediate sizes takes place, whereby can be easily accepted that between the relative Slightly adjustable segments depending on the dimensions dimensioned gaps are provided.

It is particularly favorable if at least one with slots provided segment is provided, which at regular intervals several parallel slits to each other and to its side surfaces in particular with mutually matching distances has, the distance between a side surface and the closest and parallel slot is equal to the distance between the slots. So it can the first group of segments by one or more comb-like segments are formed, which is comb-like Werkteug already due to the multiple slits the coarse grid specifies so that a curved edge of a workpiece depending on its Overall dimensions inserted in one or the other of these slots can be made while using the required transverse dimension of the adjustable segments continuously to a desired size can be adjusted. The adjustment path corresponds, as already mentioned, the distance between two adjacent slots, so that a Intermediate dimension between two such slots through the adjustable Segments can be set.

It has already been mentioned that the first group of segments from one single segment could be formed, which then expediently with several arranged at regular intervals parallel slots can be provided, it being advantageous if the number of slots equal to or greater than the number of each other adjustable segments. Correspondingly large workpieces can are edited, although only a single segment of the first group is present, which is not due to the large number of slots must be replaced, but in the introduction of a bent Edge of a workpiece in a matching slot allows while adapting the tool to the dimension this workpiece with the help of the adjustable segments can be done continuously. One workpiece size can be used According to the invention can be realized in which a bent edge of a Workpiece optionally in one or in the adjacent Slot is inserted, in one case the adjustable Segments lie against each other and in the other case to their maximum are adjusted relative to each other.

Handling and construction are particularly easy, if the segments adjustable relative to each other are infinitely variable and especially adjustable simultaneously and evenly in the sense are that when the segments are moved away from each other - and towards each other again - between the adjustable segments in each case essentially equal distances arise or are formed become. Thus, the adjustment automatically results in an even one Distribution of the adjustment paths to all spaces between the adjustable ones Segments, so that they are not significantly different Gaps are created, i.e. the best possible bending edge is maintained when the segments are moved apart.

The easiest way to distribute this evenly Achieve adjustment movement on all adjustable segments, that between the segments adjustable relative to each other Spreading means are arranged by which when adjusting a Segment, the remaining segments essentially around the same way are adjustable. Feathers, in particular compression springs, each between immediately adjacent Acting segments can be arranged, the adjacent Segments are under spring tension and when adjusting the Relax segments at least partially away from each other.

As a result, the adjustment of one in the row in Adjustment direction foremost segment the other segments practically automatically follow the adjustment movement in which each the spreading means or springs by a matching value relax, these springs of course each one have the same spring force and spring tension.

In order to be able to apply sufficiently large spreading forces in a confined space, it is favorable if disc springs or disc spring assemblies are used as compression springs for even adjustment of the adjustable Segments are provided. With disc springs can be relative generate high compressive forces in a narrow space, so that the relatively small Adjustment paths between the individual adjustable segments nevertheless with a sufficiently high force to achieve the required To have certainty that in the event of a movement apart of the segments between these equal spaces arise.

One in the row of adjustable segments outer or first Segment and / or one at the end of the interchangeable segment or segments or the outer segment or the slotted segments or the only slotted segment can be designed as a corner tool be so that with the bending machine also multiple bent or bevelled edges can be generated so that such a multiple edge folded inwards at such a corner tool space place.

So that the even distribution of the adjustment movement on the adjustable segments is as simple as possible, the relative segments adjustable relative to each other in the direction of the bending line on a piece of bolt - any, but preferably circular Cross-section - be stored, each in the adjacent Segment extends, the bolt pieces in the respective segment are arranged with this adjustable and fixed Neighboring segment with the protruding part of the bolt piece comprehensive recess is displaceable relative to it. The Alignment of the adjustable segments can be done by their movable storage on the upper cheek and one appropriate grooves on the upper cheek are ensured.

The arrangement of each between the adjustable segments effective spreading means also allows a stroke limitation the respective adjustment paths between two immediately adjacent Segments is provided in which in a neighboring segment engaging part of the bolt piece with a stroke-limiting Stop can cooperate in the sense that the movement of the Neighboring segments are limited away from each other. Thus, the for the attack of the spreading means and the mutual displacement the segments of effective bolt pieces have a double function, in which they also limit the relative adjustment movement at the same time.

It is convenient and convenient if the in the neighboring segment engaging part of the bolt piece a transverse to its extension has recess, recess or groove that runs across from one stop running through the receiving opening of the neighboring segment or pin is penetrated, the provided on the bolt piece Recess in the direction of adjustment a greater extent than that stroke-limiting stop. Thus, the bolt piece and its Recess can be adjusted relative to the pin until this on Strikes the end of the recess and thereby limits the stroke, what relates to the moving apart of the segments. In the opposite Direction, on the other hand, is the movement through the side surfaces of the Segments limited themselves. This whole is correspondingly simple Stroke limitation, so that it is also convenient and without great constructive Effort can be accommodated within the segments, especially since the actual sliding guidance of the segments, as already mentioned, on the upper beam carrying the tools.

The spreading means designed as springs can on the one hand on the inside boundary wall of the recess of the neighboring segment and on the other hand on the end face of this recess Support engaging bolt piece. So the bolt piece is enough not quite as far into the neighboring segment as its Recess or recess is deep. The one in between and remaining distance, which changes when adjusting the adjustment path changes, is filled by the spring or springs, who increase this distance when relaxing and when Pushing the segments together are tightened accordingly. The change in the distance of the end faces of the bolt piece from the inner boundary wall of the recess of the neighboring segment corresponds to the relative adjustment path between two adjustable ones Segments.

The first or outer segment of the second group of Segments, that is, the segments that can be adjusted relative to one another be adjustable by motor or machine, for example by means of a spindle drive. It is sufficient because of the above Arrangement of spreading means between the individual adjustable Segments, on the first or outer segment with such motor drive to attack when adjusting this outer segment follow the other segments of this movement to leave, so that next to this directly acted upon by a motor Segment also the other segments at least indirectly by motor be adjusted, so an operator is not required for this becomes.

Another embodiment of the invention, the adaptation to can further improve different dimensions of workpieces, could be that the adjustable relative to each other Slits running at right angles to the bend line Picking up a folded or bent edge of a workpiece exhibit. So the first and second groups of Segments practically match and / or all segments could also be adjustable relative to each other. But are additional non-adjustable segments exist, but could still be workpieces can only be edited on the adjustable segments if they have a correspondingly small overall dimension.

A practical embodiment of the invention could consist of six relative to each other in the direction of Bending line adjustable segments are provided that the width an interchangeable segment or the distance between one Side surface and a slot adjacent to this a slotted Segment or between the slots of a multi-slot Segment is about 30 mm and that the maximum adjustment of the adjustable segments away from each other is about 5 mm, so that the total adjustment adds up to the mentioned 30 mm. This practical design example shows in concrete terms: like a continuous adjustment to different workpiece dimensions is possible in a simple manner, with the maximum Adjustment of the adjustable segments away from each other between this is such a small distance that he does Bending result not affected.

An embodiment of the invention can consist in that the segments of the first group to be replaced individually or all or different numbers of these segments together towards the bend line to reduce the overall dimension of the tool can be moved away from the other segments. It is known per se that the dimensions of such tools are thereby to change that individual segments shifted and thus out of Effect. In the present case, this can be done in Combination with the segments of the second group can be applied a certain exchange in the sense of an enlargement or Reduce the number of segments of the first group.

The displacement path for individual or all segments of the first group when exchanging smaller than the dimension of a individual interchangeable segment in the direction of displacement. It can therefore be sufficient, the unneeded segments only by a relative small distance to move them out of the effective range of the to bring the remaining tool, which is still due of the segments of the first group to the desired dimensions is customizable. Exchanging segments of the first group can happen by alternately pushing away more segments and then some are shifted in opposite directions and be added to the effective tool.

Overall, this results especially when combining individual or several of the features and measures described above Bending machine with a tool set consisting of a comb tool, namely the slotted segment or additionally or instead one or more interchangeable segments and further Infinitely adjustable segments relative to each other, so that a four-sided bending of workpieces or blanks with at least a 90 ° bend of all possible dimensions can, the grid between the slots of the comb tool or the dimension of the interchangeable tool the maximum Total stroke of the adjustable segments corresponds. Thus, the Segments of the first and second groups together one Tool set, in which a tool change or a complex control and mechanical adjustment direction for individual segments is avoided and yet all possible tool dimensions are bent can be, the different dimensions continuously can be adjusted. The slot spacing or dimensions of the interchangeable segments form a coarse grid, while the thus coordinated adjustment paths each within such a division or rough screening.

Fig.1

eine Ansicht eines Teiles einer Biegemaschine, nämlich eines Teiles einer Oberwange und des als Niederhalter wirkenden Werkzeuges, wobei dieses im Längsschnitt dargestellt ist und aus mehreren Segmenten besteht,

Fig.2

eine schematisierte Stirnansicht des Niederhalters und einer als Werkstückauflage dienenden Biegeleiste sowie einer die Biegebewegung durchführenden Biegewange,

Fig.3

eine der Fig.1 entsprechende Ansicht eines aus mehreren Segmenten bestehenden Werkzeuges, wobei eine erste Gruppe durch ein mehrfach geschlitztes Segment gebildet ist, während eine zweite Gruppe von Segmenten relativ zueinander und zu dem geschlitzten Segment in Richtung der Biegelinie verstellbar ist, wobei diese verstellbaren Werkzeuge mit ihren einander zugewandten Seitenflächen aneinanderliegen und dadurch zwischen der Außenseite des äußersten Segmentes und einem der Gruppe von verstellbaren Segmente nächstliegenden Schlitz des geschlitzten Segmentes ein Mindestabstand gebildet ist,

Fig.4

eine der Fig.3 entsprechende Darstellung, bei welcher die relativ zueinander in Richtung der Biegelinie verstellbaren Segmente um einen Teil ihres möglichen maximalen Verstellweges auseinanderbewegt sind, so daß die Abmessung zwischen der Außenseite des ersten Segmentes und dem ersten Schlitz entsprechend vergrößert ist,

Fig.5

eine der Darstellung der Fig.3 und 4 entsprechende Darstellung, bei welcher die bewegbaren Segmente auf eine maximale Abmessung voneinander wegbewegt sind, so daß die Abmessung von der Außenseite des ersten Segmentes bis zu dem ersten Schlitz der Abmessung entspricht, die in Fig.3 zwischen der Außenseite des ersten Segmentes und dem zweiten Schlitz des geschlitzten Segmentes vorgesehen ist,

Fig.6

in vergrößertem Maßstab einen Längsschnitt durch die relativ zueinander in Richtung der Biegelinie verstellbaren Segmente bei gegenseitiger Anlage und Anlage an einem geschlitzten Segment mit der gegenseitigen kettenartigen Verbindung der verschiebbaren oder bewegbaren Segmente in ihrem Inneren,

Fig.7

in vergrößertem Maßstab die in Fig.6 mit X gekennzeichnete Einzelheit, darstellend die gegenseitige Verbindung der relativ zueinander bewegbaren Segmente mit den zwischen ihnen wirkenden Spreizelementen in Form von unter Spannung stehenden Blattfedern,

Fig.8

eine der Fig.6 entsprechende Darstellung nach dem Verschieben der verschiebbaren Segmente voneinander weg,

Fig.9

in vergrößertem Maßstab die in Fig.8 mit Y gekennzeichnete Einzelheit, wobei die als Spreizelemente dienenden Blattfedern gegenüber ihrer Lage in Fig.7 ganz oder teilweise entspannt sind,

Fig.10

einen Längsschnitt durch ein aus Segmenten zusammengesetztes Werkzeug, wobei sechs relativ zuemander verschiebbare Segmente mit einem oder mehreren austauschbaren Segmenten kombiniert sind und dieses Werkzeug in seiner geringsten Abmessung, das heißt bei mit ihren Seitenflächen aneinanderliegenden verschiebbaren Segmenten, dargestellt ist,

Fig.11

eine der Fig.10 entsprechende Darstellung, bei welcher die relativ zueinander bewegbaren Segmente um den jeweiligen Höchstbetrag voneinander wegbewegt sind, so daß die Gesamtabmessung gegenüber der in Fig.10 um die Abmessung eines austauschbaren Segmentes vergrößert ist,

Fig.12

eine den Fig.10 und 11 entsprechende Darstellung, wobei die in Fig.11 erreichte Abmessung gleichfalls vorgesehen ist, die bewegbaren Segmente aber aneinanderliegen und ein weiteres austauschbares Segment eingefügt ist,

Fig.13

eine der Fig.10 entsprechende Darstellung, bei welcher die Segmente der zweiten Gruppe aneinanderliegen und von den Segmenten der ersten Gruppe nur eines in Gebrauchsstellung ist, während weitere Segmente der ersten Gruppe für einen Austausch verschoben sind,

Fig.14

eine der Fig.11 entsprechende Darstellung des Ausführungsbeispieles gemäß Fig.13, wobei gegenüber Fig.13 die zur stufenlosen Vergrößerung des Werkzeuges relativ zueinander bewegbaren Segmente um den jeweiligen Höchstbetrag voneinander wegbewegt sind, so daß die Gesamtabmessung gegenüber der in Fig.13 um die Abmessung eines austauschbaren Segmentes vergrößert ist sowie

Fig.15

eine der Fig.13 entsprechende Darstellung, bei welcher ein zuvor wegverschobenes Segment der ersten Gruppe der austauschbaren Segmente dem Werkzeugsatz hinzugefügt ist, so daß sich beim Vergleich zwischen Fig.15 und Fig.13 die Austauschbarkeit eines solchen Segmentes durch Verschieben zeigt.

Exemplary embodiments of the invention are described below with reference to the drawing. It shows in a partially schematic representation:

Fig.1

2 shows a view of a part of a bending machine, namely a part of an upper beam and the tool acting as a hold-down device, this being shown in longitudinal section and consisting of several segments,

Fig.2

FIG. 2 shows a schematic end view of the hold-down device and a bending strip serving as a workpiece support and a bending beam that performs the bending movement,

Figure 3

a view corresponding to FIG. 1 of a tool consisting of several segments, a first group being formed by a multi-slotted segment, while a second group of segments is adjustable relative to one another and to the slotted segment in the direction of the bending line, these adjustable tools with their mutually facing side surfaces lying against one another and thereby a minimum distance is formed between the outside of the outermost segment and a slot of the slotted segment closest to the group of adjustable segments,

Figure 4

3 shows a representation corresponding to FIG. 3, in which the segments which are adjustable relative to one another in the direction of the bending line are moved apart by part of their possible maximum adjustment path, so that the dimension between the outside of the first segment and the first slot is correspondingly enlarged,

Figure 5

a representation corresponding to Figures 3 and 4, in which the movable segments are moved to a maximum dimension away from each other, so that the dimension from the outside of the first segment to the first slot corresponds to the dimension that in Figure 3 between the outside of the first segment and the second slot of the slotted segment is provided,

Figure 6

on an enlarged scale, a longitudinal section through the segments which can be adjusted relative to one another in the direction of the bending line when mutually abutting and abutting a slotted segment with the mutual chain-like connection of the displaceable or movable segments in their interior,

Figure 7

on an enlarged scale the detail marked X in FIG. 6, illustrating the mutual connection of the segments which can be moved relative to one another with the spreading elements acting between them in the form of tensioned leaf springs,

Figure 8

6 shows a representation corresponding to FIG. 6 after the displaceable segments have been moved away from one another,

Figure 9

on an enlarged scale the detail marked Y in FIG. 8, the leaf springs serving as expansion elements being completely or partially relaxed relative to their position in FIG. 7,

Figure 10

3 shows a longitudinal section through a tool composed of segments, six segments which can be displaced relative to one another being combined with one or more interchangeable segments and this tool is shown in its smallest dimension, that is to say with displaceable segments lying against one another with their side faces,

Figure 11

10 shows a representation corresponding to FIG. 10, in which the segments movable relative to one another are moved away from each other by the respective maximum amount, so that the overall dimension is enlarged by the dimension of an interchangeable segment in FIG. 10,

Figure 12

10 and 11, wherein the dimension achieved in FIG. 11 is also provided, but the movable segments abut one another and a further interchangeable segment is inserted,

Figure 13

10 shows a representation corresponding to FIG. 10, in which the segments of the second group abut one another and only one of the segments of the first group is in the position of use, while further segments of the first group are displaced for an exchange,

Figure 14

11 shows a representation of the exemplary embodiment according to FIG. 13, the segments that are movable relative to one another for the stepless enlargement of the tool being moved by the respective maximum amount relative to FIG. 13, so that the overall dimension compared to that in FIG. 13 by the dimension an interchangeable segment is enlarged as well

Figure 15

a representation corresponding to FIG. 13, in which a previously shifted segment of the first group of interchangeable segments has been added to the tool set, so that the comparability between FIGS. 15 and 13 shows the interchangeability of such a segment by shifting.

Matching parts are given in the description below of the different embodiments, if necessary somewhat different design, but corresponding function same reference numbers.

From a bending machine for multi-sided bending of plate-shaped Workpieces 1 such as sheets or boards with different Dimensions is schematized in Fig.2 and from its front side seen here a horizontal, serving as a workpiece support Bending bar 2 and a tool 3 acting as a hold-down device shown that acc. 1 on one against the workpiece 1 deliverable upper beam 4 is attached. This whole with 3 designated tool is in a manner to be described several, which form the bending line B and partly different Assembled segments, each with its side faces 5 are facing each other and depending on the application or one to be described for individual segments Distance from each other. Furthermore, one can see in Fig.2 the Bending movement in a known manner performing bending beam 6, the the swivel bending movements indicated by dashed lines in FIG performs when the tool 3 acting as a hold-down the Specifies workpiece 1 on the bending bar 2.

As mentioned above, the tool 3 is made up of several segments composed. It has a first group of segments 7, which in turn can be designed differently. Fig.1 on the one hand and Figures 10 to 12 on the other hand show interchangeable Segments 7, these interchangeable segments 7 in Fig.1 additionally at least one or more transverse to the bending line B and parallel to their side surfaces 5 extending slots 8 with such Slot width and slot depth have a bent edge 1a of a workpiece acc. 3 to 5 in such a slot 8 fits. Fig. 3 to 5 indicates at the same time that this first Group of segments 7 from a single segment of this type several parallel slots arranged at regular intervals 8 can exist, with as many different dimensions as possible Workpieces 1, of course, also a larger number of such slots 8 is appropriate. For example, the number of slots 8 can be the same or greater than the number of mutually adjustable segments 9 his.

The tool 3 has namely in all embodiments second group of Segmeneten 9 on, in the direction of the course the bending line B relative to one another and to the segment or segments 7 of the first group are adjustable, according to. Fig.3 to 5 or gem. 6 and 8 or according to Figures 10 to 12 the sum of maximum adjustment paths of all belonging to tool 3 adjustable segments 9 at least in the direction of the bending line B running width of an interchangeable segment 7 or Distance of a slot 8 from the one or more side surfaces 5 once slotted segment 7 and / or from a neighboring slot corresponds to a multiple slotted segment 7. This arrangement and design is in the figures already mentioned by dimensional arrows and dimensions clarified.

For example, according to 3 shows a workpiece 1 with one dimension of 290 mm on the adjustable segments 9 and one segment 7 up to the slot 8 closest to the adjustable segments 9 be detected when an edge 1a has already been bent. Likewise can a workpiece 1 with a dimension of 320 mm can also be detected, the edge 1a then engages in the next slot 8.

5, however, a workpiece 1 with a dimension of 320 mm also engage in the first slot 8 of the segment 7 when the Segments 9 by their maximum adjustment value of 5 mm from each other are moved away because a total of six such segments 9 are provided are, that is, a total of six such spaces form with each other and with segment 7. In between are stepless any intermediate dimensions possible, for example the dimension of 305 mm acc. Fig.4 when the adjustable segments 9 around half of their adjustment path are moved apart.

Fig. 6 and 8 again shows the difference of a total of 30 mm between the outer movable segment 9 and the first slot of a slotted segment 7 and the largest adjustable between them Dimension of 320 mm. One is of it in all these examples assumed that the slot 8 from the side surface 5 of the slotted segment 9 has 30 mm spacing, as well as the Slots 8 are 30 mm apart.

In the exemplary embodiment according to FIGS. 10 to 12, there are no slotted, but overall interchangeable segments 7 are provided, which in turn are 30 mm wide within the selected measurement system of the respective segment designed as a corner tool, which allows multiple folds 1b on the workpiece 1. In the 10 shows a tool set with segments 7 and 9, resulting in a total dimension of 400 mm complete. When the segments 9 are moved apart, this dimension can can be enlarged up to 430 mm. The same dimension of 430 mm can however also be achieved according to FIG Segments 9 another interchangeable segment 7 be inserted into the tool set.

It is obvious that any one in between Dimensions can be adjusted continuously if the movable Segments 9 not by their maximum path, but only a part this path adjusted relative to each other and moved apart become.

Fig.1 illustrates a variant that practically according to the arrangement Fig. 3 to 5 and the combined according to Fig. 10 to 12 by namely interchangeable segments 7 with no or only one or also several slots 8 are provided in common, ie folded edges 1a can attack, but also depending on desired dimensions can be exchanged.

Fig. 3 to 5 represents an embodiment in which a single provided with slots 8 segment 7 is provided, which in even distances from each other and from its side surfaces 5 several parallel slots 8, each with the same spacing to each other, the distance between one Side surface 5 and the closest slot 8 this the distance between the slots 8 and this dimension again the sum of all adjustment paths of the adjustable segments 9 with which this segment 7 corresponds to a tool 3 is combined. The number of slots 8 is relatively high and in this embodiment even exceeds the number of mutually adjustable segments 9, so that even relatively large Workpieces 1 can be processed with it.

Especially by comparing Figures 3 to 5 it can be seen that the segments 9 which are adjustable relative to one another are infinitely variable and thereby also simultaneously and evenly in the sense relative to each other are adjustable that when the segments 9 away from each other between these adjustable segments 9 the distances are essentially the same. A minor one Adjustment according to Figure 4 thus causes, for example, between the segments that are adjustable relative to each other are each a distance of 2.5 mm while a further adjustment up to a maximum value then in this embodiment between all segments 9 the corresponding distances of 5 mm.

This uniformity of the adjustment of the segments 9 relative to each other and to the first adjacent segment 7 is in all Embodiments achieved in that between the relatively mutually adjustable segments 9 to be described in more detail Spreading means are arranged by which when adjusting a Segment 9, the remaining segments 9 each by the same route are particularly adjustable if that as a corner tool trained, furthest from the segments 7 first Segment 9 from its position shown in Fig. 1, 3, 6 or 10 on the left, for example, that shown in FIGS. 4, 5, 8 and 11 Position is moved.

In the exemplary embodiments, springs and serve as spreading means compression springs that as disc springs 10 or packages of Disc springs are designed to make an even adjustment on the one hand, but on the other hand only takes up little space need. These springs or disc springs 10 are in contact with one another Segments 9 under spring tension or maximum Spring tension and relax when adjusting the segments 9 away from each other at least partially. Thus the spring force be used to adjust the segments 9, if only that on furthest outer segment 9 of the remaining segments 9 is moved away and thereby the necessary space for relaxation all springs 10 arises.

In all exemplary embodiments it is provided that this is in line the adjustable segments 9 outer or first segment and also that at the end of the interchangeable segment or segments 7 or slotted segments 7 arranged outer segment each as Corner tool is designed to be folded twice To allow edge 1b of the workpiece 1, as is particularly the case in FIG. 3 to 5 on the one hand and in Fig. 10 to 12 on the other hand. In the same way, those within these rows of Segments 7 and 9 may be different be broad or different, without doing so the advantageous stepless adaptability to different sized Losing workpieces 1.

These can be used for the mutual adjustment movement of the segments 9 in a conventional manner in the upper cheek 4 and be guided. In addition, however, it is provided that which are adjustable relative to each other in the direction of the bending line B. Segments 9 are each mounted on a bolt piece 11, which each extends into the adjacent segment 9, the Bolt pieces 11 in the respective segment 9 together with this are arranged fixed and the neighboring segment with a the protruding part of the bolt piece 11 overlapping recess 12 is displaceable relative to it. You can see, for example in Figures 10 to 12 that in the row of adjustable segments 9 the rightmost segment has a recess 12, in which a bolt piece 11 engages, which no longer with one adjustable, but also not interchangeable segment 7a connected is. In the same way, a first bolt piece 11 can be fixed to a slotted segment 7 connected, the gem. Fig.1 and according 6 to 8 the adjustable segments 9 immediately adjacent so that the one on the right that is shown and located directly adjacent to the non-adjustable segments 7 adjustable segment 9 perform the desired adjustment movement can.

The part of the which engages in a respective neighboring segment Bolt piece 11 acts with a stroke-limiting stop together in the sense that the movements of the neighboring segments 9 are limited to the desired maximum amount away from each other, which can be, for example, 5 mm according to FIG. The one in that Has adjacent segment engaging part of the bolt piece 11 a transverse to its extent recess 14 or Recess or groove extending from one across the recess 12 of the neighboring segment 9 extending stop or pin 15 , wherein the recess 14 provided on the bolt piece 11 in Direction of adjustment is greater than the stroke-limiting formed as a pin 15 stop. This arrangement will particularly clear when comparing Figures 6 and 8 and above all of Figures 7 and 9. While in Figures 6 and 7 adjacent to each other adjustable segments 9 lie against each other with their side faces 5 and the pins 15 are each a distance from the end 14a of the recess 14, they are moved apart in Fig. 8 and 9, namely by their greatest possible adjustability, with the pins 15 each strike at the ends 14a of the recesses 14 and rest.

The spreading means designed as disc springs 10 are supported on the one hand on the inside boundary wall 12a Recess 12 of the neighboring segment 9 and the other on the Front side of the one which engages and projects into this recess 12 Bolt piece 11 from, the recess 14 and their right-angled end 14a adjacent to these disc springs 10 and their point of attack are arranged, especially as the Fig. 7 and 9 clearly show.

For a simple and quick change and fine adjustment a dimension of the entire tool 3 is in the Row first or outer, in this case designed as a corner tool Segment 9 of the second group of segments 9 motor or mechanically adjustable, for example by means of a spindle drive 16, which is shown schematically in Fig.1, wherein the spindle 17 is driven by an angular gear 18. So becomes the spindle 17 twisted in the sense that in Fig.1 or 6 or 10 am furthest left segment, designed as a corner tool 9 is moved in the direction of arrow Pf1 in FIG The position shown in FIG. 8 is followed by the other movable segments 9 automatically due to the preload and force of the disc springs 10 so that the very first one, directly from the spindle drive 16 acted on segment 9 overall in the illustrated embodiment 30 mm, the next segment 5 mm less etc. in the direction of Arrow Pf1 can be moved, the last of the six movable Segments 9 is only shifted by 5 mm in the direction of arrow Pf1. The position shown in FIG. 6 thus becomes that shown in FIG. 8 Position reached, resulting in an overall increase in size corresponds to a total of 30 mm, but of course also each Intermediate stage is possible.

While in the exemplary embodiments six are relative to one another and to the slotted or replaceable segments 7 in the direction the bending line B and the arrow Pf1 adjustable segments 9 shown could be five or seven or some other number adjustable segments 9 can be provided and also could another change in size can be achieved or it could be the achievable between the adjustable segments 9 in the maximum case Distance different, for example smaller than that now in the exemplary embodiment mentioned 5 mm.

Overall, there is a tool set 3, in which without a tool change all possible board lengths with at least a 90 ° bend can be bent, using either one or more comb segments 7 are combined with continuously adjustable segments 9 and the grid between the slots 8 of the comb segments 7 the maximum stroke of the adjustable segments 9 corresponds to this maximum stroke by the pressure force of the disc springs 10 evenly is distributed to all movable segments 9 and stroke-limiting Means in the form of cross pins 15 for this even distribution ensure the greatest possible stroke on all movable segments 9.

However, it is also possible that the tool set 3 with a minimum number of segments 7 and 9 all workpiece dimensions or board lengths allowed in that at least one interchangeable Segment 7 is combined with the adjustable segments 9, the total of the adjustment paths of the adjustable segments 9 the dimension of the interchangeable segment 7 in the direction of Bending line and thus corresponds in the direction of adjustment, so that too in this way a continuous adjustment to different Workpiece sizes is possible.

Furthermore, these solutions can also be combined according to FIG the slotted or comb segments 7 with more or fewer slits 8 interchangeable and also with unslit interchangeable segments can be combined.

Finally, in Fig.13 to 15 is another embodiment of the Tool set 3 shown, the in the direction of the bending line B and arrow Pf1 for infinitely changing the dimension adjustable segments 9 constructed in the same way and with each other are connected, as in the previously described exemplary embodiments the case is, so this is no additional explanation requirement. The segments 7 of the first group of segments are in this Embodiment interchangeable in that - also in Direction of the bending line - according to arrow Pf2 in Fig. 15 and this can be moved in or out of the opposite position.

If you compare Fig.15 with Fig.13, you can clearly see that the in Fig. 15 outermost segment 7 of the first group of segments exchanged, i.e. either used or not used can that - together with further such segments 7 - can be moved.

In particular, a tool set results from FIG. 13 with an effective dimension of 300 mm. By moving have interchangeable segments - as in the previous ones Embodiments - a dimension of 30 mm in this direction.

According to Fig. 14, the overall dimension of the tool set for one workpiece by pushing apart the segments 9 of the second Group can be enlarged by a total of 30 mm, so that there is a Dimension of 330 mm results.

However, the same dimension of 330 mm can also be achieved in this way be that of the interchangeable segments 9 one of the in Fig.13 Such a segment 9 not in the active position according to the Arrow Pf2 shifted and so the remaining segments of the tool set is added or connected to it, as shown in Fig. 15 in the end result shows. From this arrangement, in turn, can be stepless by pushing apart the segments 7 an increase in size another up to 30 mm are generated, after which another one Enlargement again by merging segments 9 and adding another interchangeable segment 7 can take place.

It is therefore possible to replace the segments 7 of the first group individually or all or also different numbers of these Segments together in the direction of the bending line for reduction the overall dimension of the tool away from the other segments to move or reconnect to enlarge. It can be seen in Fig. 13 to 15 that the displacement path for individual or all segments 7 of the first group when exchanging smaller than the size of a single interchangeable segment 7 can be in the direction of displacement because it is enough space for one to create bent edge 1a of a workpiece 1.

Overall, this results in a tool 3 or Tool set for bending machines, preferably folding machines, in which a manual tool change or a complex one mechanical movement of individual parts of the tool set can be avoided with considerable design effort. Although not Tool change is necessary, it is with the tool 3 according to the different embodiments of Figures 1 to 12 possible, continuously to bend any board lengths or tool dimensions.

The bending machine for multi-sided bending, in particular swing bending, of plate-shaped workpieces 1 or blanks has a Bending strip 2 serving as workpiece support, acting as a hold-down device Tool 3 and at least one performing the bending movement Bending beam 6, with which the resting on the bending strip 2 Circuit board around the tool 3 is pivotable and bendable. The tool 3 has a first group of segments 7 which are interchangeable, For example, out of use position and movable back again are and / or at least one transverse to the bending line B and parallel to their side surfaces 5 extending slot 8 with a have such a width and depth that a bent edge 1a of a workpiece 1 fits into this slot 8. Furthermore belongs to the Tool 3 a second group of segments 9, which in the direction of Bending line B relative to each other and to the segments 7 of the first Group are adjustable, the sum of the maximum and limited Adjustment paths of all segments 9 belonging to the tool 3 in the direction the bending line B provided width of an interchangeable segment 7 or the distance arranged in this direction Slit 8 from the or the side surfaces 5 of a once slotted Segment 7 or the distance of a slot 8 from his Neighbor slot 8 of a multiple slotted segment 7 corresponds, so that workpieces of any size are infinitely variable in the direction of the bending line 1 can be edited.

Claims (17)

1. Bending machine for the multilateral bending of workpieces (1) in sheet form, such as sheet metal or plates, of different dimensions, with a, particularly horizontal, bending strip (2) acting as a workpiece support and with a tool (3) acting as a press pad on a top clamping bar which can be moved towards the workpiece (1), said tool (3) being made up of a plurality of segments (7, 9) forming the bending line (B) which have their side faces (5) facing each other and/or abutting on one another, and with at least one bending beam (6) which performs the bending movement, characterised in that the tool (3) has a first group of segments (7) which are exchangeable and/or have at least one slot (8) extending transversely with respect to the bending line (B) and parallel to the side surfaces (5) thereof, the width and depth of the slot being such that a curved edge (1a) of a workpiece (1) fits into this slot (8) , in that the tool (3) has a second group of segments (9) which are movable relative to one another and to the segments (7) of the first group in the direction of the bending line (B), and in that the sum of the maximum adjustment distances of all the segments (9) belonging to the tool (3) corresponds at least to the width, in the direction of the bending line (B), of an exchangeable segment (7) or of the spacing of a slot (8) from the side face or side faces (5) of a single-slotted segment (7) and/or from an adjacent slot of a multi-slotted segment (7).
2. Bending machine according to claim 1, characterised in that there is at least one segment (7) provided with slots (8) which comprises a plurality of parallel slots (8) at regular intervals from one another and from its side faces (5) , particularly at identical spacings from one another, while the spacing between a side face (5) and the slot (8) closest to it is equal to the spacing of the slots (8) from one another.
3. Bending machine according to claim 1 or 2, characterised in that the first group of segments consists of a single segment with a plurality of parallel slots (8) arranged at regular intervals, the number of slots (8) in particular being greater than or equal to the number of segments (9) which are movable relative to one another.
4. Bending machine according to one of claims 1 to 3, characterised in that the segments (9) which are movable relative to one another can be moved smoothly, in particular uniformly and at the same time, so that as the segments (9) are moved away from one another substantially equal spacings are maintained between the movable segments (9).
5. Bending machine according to one of claims 1 to 4, characterised in that spreading means are arranged between the segments (9) which are movable relative to one another, by means of which, as one segment (9) is moved, the other segments (9) are each movable by the same amount.
6. Bending machine according to one of claims 1 to 5, characterised in that springs, particularly compression springs, in each case acting between immediately adjacent segments, are provided as the spreading means, which are under spring tension when the segments (9) are abutting on one another and are at least partially relaxed as the segments (9) are moved away from one another.
7. Bending machine according to claim 6, characterised in that plate springs (10) or bundles of plate springs are provided as compression springs for moving the adjustable segments evenly.
8. Bending machine according to one of claims 1 to 7, characterised in that an outer or first segment in the row of movable segments (9) and/or an outer segment arranged at the end of the exchangeable segment(s) (7) or of the slotted segment(s) or the only slotted segment (7) is constructed as a corner tool.
9. Bending machine according to one of claims 1 to 8, characterised in that the segments (9) which are movable relative to one another in the direction of the bending line (B) are each mounted on a bolt member (11) which extends into the adjacent segment (9) in each case, the bolt members (11) in the segment (9) in question being fixedly mounted so as to be movable with said segment, and the neighbouring segment is movable relative thereto with a recess (12) engaging over the protruding part of the bolt member (11).
10. Bending machine according to claim 9, characterised in that the part of the bolt member (11) engaging in a neighbouring segment co-operates with a travel-limiting stop (15) so that the movement of the neighbouring segments (9) away from each other is limited.
11. Bending machine according to claim 9 or 10, characterised in that the part of the bolt member (11) engaging in the neighbouring segment has a recess (14) , opening or groove extending at right angles to its direction, through which passes a stop or pin (15) extending transversely through the opening (12) in the neighbouring segment (9) , while the recess (14) provided on the bolt member (11) is larger than the travel-limiting stop in the direction of movement.
12. Bending machine according to one of claims 5 to 11, characterised in that the spreading means in the form of springs (10) are braced against the inner boundary wall (12a) of the opening (12) in the adjacent segment (9), on the one hand, and against the end face of the bolt member (11) engaging in this recess (12), on the other hand.
13. Bending machine according to one of claims 1 to 12, characterised in that the first or outer segment (9) in the row of the second group of segments (9) can be motor-driven or moved mechanically, for example by means of a spindle drive (16).
14. Bending machine according to one of claims 1 to 13, characterised in that the segments which are movable relative to one another may also have slots extending at right angles to the bending line, for receiving a bent or curved edge of a workpiece.
15. Bending machine according to one of claims 1 to 14, characterised in that six segments (9) are provided, which are movable relative to one another in the direction of the bending line (B), in that the width of an exchangeable segment (7) or of the spacing between a side face (5) and an adjacent slot (8) of a slotted segment (7) or between the slots (8) of a multi-slotted segment (7) is about 30 mm and in that the maximum movement of the adjustable segments (9) away from one another is about 5 mm in each case.
16. Bending machine according to one of the preceding claims, characterised in that, for the purpose of exchanging individual ones or all or various numbers of the segments (7) , the segments (7) of the first group can all be moved away from the other segments together, in the direction of the bending line, in order to reduce the overall dimensions of the tool.
17. Bending machine according to claim 16, characterised in that the travel distance for individual segments or all the segments (7) of the first group during the exchange is less than the dimension of an individual exchangeable segment (7) in the direction of movement.

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