EP3154722B1 - Bending press having bending unit, and reshaping method - Google Patents

Description

The invention relates to a bending press and a method for forming, in particular bending, a sheet to a workpiece, as described in claims 1 and 12. Such a bending press or such a method are for example in the DE - A-3837603 disclosed. From the EP 0 679 456 A1 is a bending press with a bending unit for folding a sheet to a workpiece has become known, in which the bending tool is connected to an angle measuring device for determining its relative position with respect to the bending beam. The bending press comprises a stationary machine frame, a lower clamping bar with at least one lower clamping jaw held thereon, which has at least one clamping jaw a first forming edge, and an upper clamping bar. At the upper clamping bar, at least one upper clamping jaw is held thereon, which at least one clamping jaw has a second forming edge. The upper clamping bar is adjustable relative to the machine frame relative to a clamping bar guide by means of a drive arrangement, in order to be able to clamp the workpiece to be produced between the two clamping jaws. The at least one lower jaw has a lower clamping surface on its end region facing the upper clamping jaw. The at least one upper jaw has an upper clamping surface on its end region facing the lower clamping jaw, wherein the two clamping surfaces define a workpiece support plane for the workpiece to be produced when the position adjoins one another.

The bending unit comprises bending tools which have a bending edge. Furthermore, the bending tools are arranged on a bending beam, wherein the bending beam is adjustable relative to the machine frame on bending beam guides designed as linear guides by means of a bending beam drive. The bending tools are pivotable about a parallel with respect to one of the forming edges aligned pivot axis. The bending beam has a C-shaped cross section, wherein the bending tool is pivotably arranged on the two legs on the inside. For both Abkantrichtungen so a separate bending tool is necessary.

The DE 38 37 603 A1 describes a sheet metal bending machine with a vertically movable upper beam and a workpiece carrying bending table. The workpiece is bent either by a pivoting movement of a bending beam with a bending tool held thereon about a bending pivot axis or by means of a bending bending operation by a Hubhöhenverstellung the bending beam. The bending pivot axis for the bending beam is arranged in the region in front of the bending edge of the bending table or in front of the upper beam as a function of the material thickness of the workpiece. The bending cheek is pivoted in a fixed radius about the bending pivot axis for the bending process, depending on the bending direction and the associated arrangement of the bending cheek either above the workpiece or below the workpiece which is pivoted to the bending cheek bending tool is pivoted accordingly. In the bending process, the bending cheek is moved together with the bending tool only for the bending process in a plane perpendicular to the bending table level. For the Scherbiegevorgang when located below the workpiece bending beam, the bending tool projects upwards on the workpiece. If a bending operation is to be performed from top to bottom, the bending beam must be swiveled by 180 ° so that it is above the bending table and thus the workpiece. By the pivoting movement of the bending cheek an alignment of the bending tool is achieved downwards in the direction of the workpiece. Subsequently, the bending process can be done from top to bottom.

Other about a pivot axis mounted on a machine frame bending beam with bending tools are from the DE 94 04 308 U1 . EP 0 293 964 A2 . EP 1 121 996 B1 or the EP 1 302 252 A1 known.

The present invention has for its object to provide a bending press with a bending unit with a bending tool and to provide a method with which universal forming operations, in particular folds, are possible.

This object of the invention is solved by the features of claim 1. The advantage achieved by the features of claim 1 lies in the fact that the possibility is created to arrange the pivot axis of a bending tool and its bending jaws facing the bending edge either above or below the workpiece support level and align accordingly. So can the bending beam together with it arranged bending tool as far as the workpiece support plane in the vertical direction to be arranged distanced, so that a sufficient space behind the jaws for arranging and / or receiving the workpiece to be formed is available. Thus, depending on the bending or Abkantrichtung to be carried out, the bending tool together with the bending tool carrying the bending beam can be adjusted in a position located on both sides of the workpiece support plane positions. Thus, there is no component of the bending unit immediately behind the jaws. Subsequently, the bending tool can be aligned with its bending edge in the direction of the respective forming edge of one of the lower or upper clamping jaws. This can be found with one and the same bending tool Auslangen, which can be aligned by the corresponding pivoting movement about the pivot axis, the bending edge to the respective bending direction and / or Abkantrichtung. Upon further adjustment of the forming process, in particular the Abkantvorgang. In this case, the leg to be bent is preferably pivoted onto the side facing away from the bending tool and thus into the free space behind the clamping jaws.

Also advantageous is a further embodiment according to claim 2, characterized in that a torsion and thus the pivoting movement can be transmitted directly from the bending beam to the bending tool arranged thereon. Thus, a double function can be taken over by the bending beam formed as a shaft, since this one hand, the bending tool contributes and supported accordingly and on the other hand, a pivoting movement is made possible by the axis defined by the shaft pivot axis for the bending tool.

Another advantage is an embodiment according to claim 3, since it can be dispensed with additional drive means directly in the region of the bending tool for this, as a direct torque transfer via the shaft takes place on the bending tool. Thus, in a correspondingly rotationally fixed connection or coupling additional space for the machining operations of the workpiece to be produced can be created.

Due to the construction according to claim 4, it is possible to provide a compact unit, since so the shaft with the pivotally connected to it in drive connection pivoting requires no additional adjusting means in the immediate vicinity of the bending tool. The transmission of the drive torque can therefore take place in at least one arranged in the direction of the bending region or the Umformkanten arranged end portion of the shaft.

According to another embodiment variant according to claim 5, the possibility is thus created to achieve a relative positional fixation of the bending edge with respect to the forming edges on the clamping jaws. Thus, with a corresponding preset angular position of a plane defined by the bending edge and the pivot axis tool plane with respect to the workpiece support plane and / or the bending tool adjustment plane at a sole adjustment movement of the bending beam in the bending tool adjustment plane an adjustment can be performed with unchanged angular position.

Also advantageous is a further development according to claim 6, since an eccentric guidance of the bending beam with the pivot axis defined by the latter is avoided laterally next to the bending tool adjustment plane defined by the bending beam guides. As a result, a more compact design of the bending unit can be created.

In the embodiment according to claim 7 it is advantageous that a more individualized design of the bending tool is made possible. By dividing the bending tool into a plurality of bending tool elements arranged one behind the other, a more individual adjustment of the entire bending tool to the respective bending and / or bending process to be carried out can be carried out.

Through the development according to claim 8 it is achieved that only those bending tool elements can be brought into the working position, which are necessarily required for the bending and / or Abkantvorgang to be performed of the workpiece to be produced. Unnecessary bending tool elements can thus be arranged outside the working area and still remain stored on the bending beam.

Due to the construction according to claim 9, a rigid, designed as an axis bending beam for the storage of the bending tool or its bending tool elements can be created. An independent pivoting and / or adjusting movement of the individual bending tool elements can thus take place about the supporting axis. In turn, an individual adjustment and pre-positioning of the individual bending tool elements required for the bending and / or bending process to be carried out can take place.

Also advantageous is an embodiment according to claim 10, as can be done in a confined space of the drive and thus the rotational adjustment of the individual bending tool elements about the supporting axis.

According to one embodiment, as described in claim 11, so sufficient clearance can be created for the workpiece to be produced in the region of the workpiece support level also behind the jaws. By the laterally spaced apart arrangement of the bending beam guides an exact guidance accuracy of the bending beam can be achieved and still be created on the side facing away from the jaws side of the bending beam a large space for the produced and / or workpiece to be machined.

The object of the invention is, however, independently solved by a method for forming, in particular bending, a sheet to a workpiece according to the features indicated in claim 12. The advantages resulting from the combination of features of this claim are that this creates the possibility of arranging the pivot axis of the one bending tool and its bending edge facing the clamping jaws either above or below the workpiece support plane and to be able to align accordingly. Thus, the bending beam together with the arranged thereon Bending tool are arranged so far distanced from the workpiece support plane in the vertical direction, so that a sufficient space is available behind the jaws for arranging the workpiece to be formed. Thus, depending on the bending or Abkantrichtung to be carried out, the bending tool together with the bending tool carrying the bending beam can be adjusted in a position located on both sides of the workpiece support plane positions. Subsequently, the bending tool can be aligned with its bending edge in the direction of the respective forming edge of the jaws. This can be found with one and the same bending tool Auslangen, which can be aligned by the corresponding pivoting movement about the pivot axis, the bending edge to the respective bending direction and / or Abkantrichtung. As a result of the superimposed, simultaneous adjustment and pivoting movement of the bending tool, a constant contact of the bending edge on the workpiece can be achieved. This surface damage can be almost avoided or even switched off.

Furthermore, a procedure according to the features specified in claim 13 is advantageous because it allows a slight overbending and / or folding of the angled leg can be achieved. Thus, even with an elastic springback the predetermined bending angle of the leg can be maintained.

A further advantageous procedure is described in claim 14, whereby a torsion transmission and thus the pivoting movement can be transmitted directly from the bending beam to the bending tool arranged thereon. In this way, a double function can be assumed by the bending beam designed as a shaft, since on the one hand it carries the bending tool and accordingly supports it, and on the other hand a pivoting movement about the pivot axis defined by the shaft is made possible for the bending tool.

Also advantageous is a variant of the method according to claim 15, because it can be dispensed with additional drive means directly in the region of the bending tool for this, as a direct torque transfer via the shaft takes place on the bending tool. Thus, in a correspondingly rotationally fixed connection or coupling additional space for the machining operations of the workpiece to be produced can be created.

It is advantageous in the process steps selected according to claim 16, that thus a compact unit can be created, because so the shaft with the standing in driving connection pivoting drive requires no additional adjusting means in the immediate vicinity of the bending tool. The transmission of the drive torque can therefore take place in at least one arranged in the direction of the bending region or the Umformkanten arranged end portion of the shaft.

For a better understanding of the invention, this will be explained in more detail with reference to the following figures.

Fig. 1

eine Fertigungsanlage mit Biegepresse in Frontansicht;

Fig. 2

die Fertigungsanlage nach Fig. 1, in Seitenansicht mit vereinfacht dargestellter Biegeeinheit, teilweise geschnitten;

Fig. 3

einen Teilbereich der Biegepresse mit stark stilisierter Biegeeinheit, in Seitenansicht;

Fig. 4

einen Teilbereich einer anderen Biegepresse mit stark stilisierter Biegeeinheit, in Seitenansicht.

In each case, in a highly simplified, schematic representation:

Fig. 1

a production plant with bending press in front view;

Fig. 2

the manufacturing plant after Fig. 1 , in side view with simplified illustrated bending unit, partially cut;

Fig. 3

a portion of the bending press with highly stylized bending unit, in side view;

Fig. 4

a section of another bending press with highly stylized bending unit, in side view.

By way of introduction, it should be noted that in the differently described embodiments, the same parts are provided with the same reference numerals or the same component names, wherein the disclosures contained in the entire description can be mutatis mutandis to the same parts with the same reference numerals or component names. Also, the position information selected in the description, such as top, bottom, side, etc. related to the immediately described and illustrated figure and these position information in a change in position mutatis mutandis to transfer to the new location.

In the Fig. 1 and 2 a production plant 1 is shown in a highly schematically simplified representation, which is formed in the present case in particular for the swivel bending or bending of bending to be produced from sheet metal workpieces 2.

The manufacturing plant 1 used for bending in the present case comprises a bending press 3, in particular a press which is designed to clamp the workpieces 2 or workpieces to be produced from the sheet metal between a clamping tool 4 that is adjustable relative to one another. The clamping tool 4 comprises in the present embodiment, at least one, but usually a plurality of lower jaws 5 and at least one, but usually more cooperating upper jaws 6. The at least one upper jaw 6 is arranged above the workpiece to be manufactured 2 on the bending press 3 and there also held accordingly, in particular clamped. Also, the at least one lower jaw 5 is held on the bending press 3, in particular clamped.

A machine frame 7 of the bending press 3 comprises, for example, vertically upstanding from a base plate 8 and mutually parallel side cheeks 9, 10. These are preferably interconnected by a solid, formed for example of a sheet metal part cross member 11 at their distance from the bottom plate 8 end regions , The machine frame 7 is usually a solid, preferably on a hall floor fixed component of the bending press. 3

The side cheeks 9, 10 may be formed to form a clearance for the forming of the workpiece 2 preferably in approximately C-shaped, wherein attached to front end faces 12 of bottom legs of the side cheeks 9, 10 a fixed, in particular on the bottom plate 8 upstanding lower clamping bar 13 is, which can also be referred to as a pressing bar. This stationary and fixed clamping bar 13 can also be referred to as a clamping table, are arranged on the parts of the bending tool 4 and also held. At the front end faces 14, a further upper clamping bar 16, in particular a pressure bar, which is relatively adjustable relative to the lower clamping bar 13, is guided on the leg remote from the base plate 8 in clamping bar guides 15. The clamping bar guides 15 are usually designed as linear guides in a variety of embodiments. This further clamping bar 16 may also be referred to as a pressing bar be, but which is guided relative to the machine frame 7 displaceable on this. On opposite, mutually parallel end surfaces 17, 18 of the two clamping bars 13, 16 jaw receiving 19, 20 are arranged for assembly with the clamping tools 4. The or the clamping tools 4 can also be held with the interposition of an adapter not shown on the jaw receiving 19, 20.

The bending press 3 shown has as drive arrangement 21 for the adjustable upper clamping bar 16, namely the pressure bar, e.g. two powered by electric energy drive means 22, which are conductively connected to a fed from a power grid 23 control device 24. By way of example, the operation of the bending press 3 can be controlled via a line-connected input terminal 25 connected to the control device 24.

The drive means 22 are preferably electromotively operated spindle drives 26, as they are generally known, of which adjusting means 27 for a reversible actuating movement of the upper clamping bar 16 formed by the pressure bar with this, for example, are drive-connected.

Further details required for the operation of such a bending press 3, such as, for example, safety devices, stop arrangements and / or control devices, are omitted from the description in order to avoid an unnecessary length of the description.

Furthermore, the manufacturing plant 1 can also be simplified here in the Fig. 2 comprise manipulator 28, which at least a piece thereof removes from a schematically indicated supply stack 29 of sheets to be deformed or abzukantenden and spends in the work area of the bending press 3. The manipulator 28 in turn comprises a gripping tongs 30, shown in a simplified manner, which in turn has gripping fingers 31, 32. The gripping fingers 31, 32 each have clamping surfaces on the side facing the workpiece 2 to be produced. By a corresponding pivoting of the two gripping fingers 31, 32 against each other and applying a sufficient clamping force, the sheet or the workpiece to be manufactured 2 is held by the manipulator 28 and moved accordingly and positioned between the open jaws 5, 6 on the interaction of the clamping surfaces. With the gripper fingers 31, 32 of the gripping tongs 30 is a corresponding gripping and later ensured due to the clamping movement sufficient support for the workpiece to be produced from the sheet 2.

It is further simplified here that the two clamping bars 13, 16, in particular their tool holders 19, 20, or the clamping tool 4 held thereon with his or her lower and upper jaws 5, 6, when viewed in the longitudinal direction of the clamping bar thirteenth , 16 define an adjustment plane 33 extending therebetween. The adjustment plane 33 preferably runs centrally with respect to the clamping bars 13, 16 or the jaw receivers 19, 20 arranged on them. In the present exemplary embodiment, a vertically oriented plane is understood here.

The two jaws 5, 6 form a clamping region 34 between them at mutually facing ends. Mutually facing lower and upper clamping surfaces 35, 36 of the two clamping jaws 5, 6 are preferably aligned at right angles with respect to the adjusting plane 33. An additional support table with a support surface may be arranged in the region of the front of the bending press 3, but is not shown in detail. The support surface can be arranged in the same plane as the lower clamping surface 35 of the lower jaw 5. This is used in larger sheets as additional support to prevent accidental kinking, especially with thin sheets.

In this case, a bending region 37 is understood as meaning the region which serves to form the workpiece 2 to be produced from the sheet, which is usually still flat, or to further process an already pre-formed workpiece 2 by forming at least one additional bend.

The bending region 37 is usually spaced from the Verstellbene 33 and is formed by end portions of at least one of the two jaws 5 and / or 6. In the present embodiment, the bending region 37 is arranged on the side facing away from the manipulator 28 or the operator side of the clamping bar 13, 16. Thus within the machine frame 7.

The bending region 37 usually forms a preferably rectilinear bending line on the workpiece 2 to be produced, wherein on both sides of this each leg forms as a result of the bending process carried out. Depending on the desired or produced geometry of the workpiece 2, the two legs enclose between them a bending angle. This bending angle is measured in a reference plane aligned perpendicular to the bending line. The reference plane, for its part, is furthermore preferably also aligned with respect to the adjustment plane 33 in the vertical direction.

It should be noted that the machine frame 7 of the bending press 3 is shown only very simplified, and it is also possible to use different embodiments thereof. So could e.g. the machine frame 7 and the machine body may be formed with a free stator passage. In this case, the jaw receivers 19, 20 could be received between the side walls 9, 10 and side panels. In another embodiment of the machine frame 7 or of the machine body, no free stator passage is possible, as a result of which the clamping jaw receptacles 19, 20 can not be received between the side cheeks 9, 10 or side parts.

To carry out the bending process, the bending press 3 of the manufacturing plant 1 also includes a bending unit 38, which may also be referred to as a bending unit. This is simplified in the Fig. 2 indicated and can be adjusted relative to the machine frame 7 in a preferably parallel with respect to the Verstellbene 33 aligned bending tool adjustment plane 39. For the sake of clarity, the representation of the bending unit 38 and its components has been omitted in the FIGURE.

In this case, the pre-positioned between the two jaws 5, 6 and clamped held sheet to form the workpiece 2 by a bending operation, in particular a bending process, along the bending region 37 forming bending line formed, in particular be folded.

Depending on the fold to be performed between the clamping jaws 5, 6 clamped held sheet for the preparation of the workpiece 2, either the lower jaw 5 or the upper jaw 6 forms the bending region 37 from. Thus, the lower jaw 5 forms a first Umformkante or has this. The upper jaw 6 forms or has a second forming edge.

The at least one lower clamping jaw 5 has a lower clamping surface 35 at its end region facing the upper clamping jaw 6. The at least one upper clamping jaw 6 has an upper clamping surface 36 at its end region facing the lower clamping jaw 5. The two clamping surfaces 35, 36 define in a contiguous position a workpiece support plane 40 for the workpiece 2 to be produced.

The bending unit 38 comprises a bending tool 41, which has a bending edge 42. The bending tool 41 is arranged on a bending beam 43, wherein the bending beam 43 is adjustable relative to the machine frame 7 on bent beam guides 44 designed as linear guides by means of a bending beam drive 45. Furthermore, the bending tool 41 is pivotable about a parallel with respect to one of the forming edges aligned pivot axis 46. Basically, a pivot axis is understood to be a central axis and not a physical component. The pivotal axis forming different components will be described in more detail below.

The bending beam guides 44 are preferably arranged or formed in the region of the two side cheeks 9, 10 and are thus arranged distanced from one another in the direction of the bending region 37 or the forming edges. The bending beam 43 is guided on the bending beam guides 44 at its end portions which are also distanced from one another in the direction of the bending region 37 or the forming edges. This can be created behind the two jaws 5, 6 sufficient clearance for the workpiece 2 to be produced. As a result of the vertical adjustment possibility of the bending beam 43, a large working area can be created for the leg of the workpiece 2 to be folded, since no bending beam 43 with the bending tool 41 is arranged directly in the region of the workpiece support plane 40 behind the clamping jaws 5, 6 before the beginning of the forming process , Before the start of the bending and / or bending operation, the bending beam 43 is either above or below the workpiece support plane 40.

The bending unit 38 with the workpiece 2 to be clamped clamped holding jaws 5, 6 is in the following Fig. 3 described in more detail.

As a coordinate system or coordinate direction, the following alignment is selected in bending presses 3 in the present specification. The X-coordinate represents the insertion direction of the sheet to be formed and is aligned at right angles with respect to the adjustment plane 33. The Y-coordinate represents the vertical direction and is aligned at right angles with respect to the workpiece support plane 40. Finally, the Z coordinate in the direction of the bending region 37 is aligned.

In the Fig. 3 an optionally independent embodiment of the bending unit 38 is shown, wherein for like parts the same reference numerals or component designations as in the preceding Fig. 1 and 2 be used. In order to avoid unnecessary repetition, the detailed description in the previous ones will be used Fig. 1 and 2 referred or referred.

It should be noted that in the representation of the bending unit 38, these or its components have been shown only greatly simplified and stylized. Furthermore, in this embodiment, the bending unit 38 on the side facing away from the operator not shown side of the jaws 5, 6 are arranged. The bending beam guides 44 are also seen in the direction of the bending region 37, spaced from each other. Between these, in turn, the bending beam 43 extends with the bending tool 41 arranged thereon.

The bending beam guide 44 is preferably arranged in the region of the two side cheeks 9, 10 so as to allow unhindered space for arranging the workpiece 2 or the sheet to be produced starting from the two clamping jaws 5, 6 between the bending beam guides 44 in the longitudinal extent of the bending region 37 to have. The bending beam guide 44 may be formed by a variety of known prior art guide units and / or guide assemblies. It is essential to form an exact linear guide for the bending beam 43. The bending beam guides 44 forming the guideways serve to be able to guide the bending beam 43 in an exact linear guide along the bending tool adjustment plane 39 for the exact execution of a bending operation or folding operation.

The choice of the bending beam drive 45 can also be made according to the drive means known in the prior art. Here, for example, cylinder piston arrangements, linear drives, traction drives or the like could be used.

Defined by the bending beam 43 pivot axis 46 for the bending tool 41 forms the central pivot base and / or the pivot center for the bending tool 41. The bending unit 38 includes the bending tool 41, which are pivoted about the pivot axis 46 in different angular position with respect to this seen in the circumferential direction around it can. Furthermore, the pivot axis 46 and thus the bending beam 43 can be displaced both into a position that is relative to the workpiece support surface 40 above the workpiece support plane 40 and into a position located below the workpiece support plane 40. This is already simplified in the Fig. 2 indicated.

As a result, the possibility is created to shift the bending tool 41 to the respective side of the workpiece support surface 40, depending on the bending process to be carried out or the direction of descent. Since the bending tool adjustment plane 39 is preferably oriented parallel to the bending region 37 or parallel to one of the two forming edges of the clamping jaws 5 and / or 6 and parallel to the adjustment plane 33, an equal horizontal distance over the entire vertical extent or Vertical extension of the bending tool adjustment plane 39 between this and the bending region 37 created. Preferably, the workpiece support plane 40 is arranged or formed in a horizontal plane, in which case the bending tool adjustment plane 39 is preferably aligned at right angles thereto.

Regardless of this, it would also be possible to align or arrange the bending tool adjustment plane 39 at an angle and not at right angles with respect to the workpiece support plane 40. Thus, for example, starting from the bending region 37 in the direction of the vertical extension of the bending tool adjustment plane 39, a different horizontal distance can be formed. This can be created by the oblique guidance of the bending beam 43 a more universal training and formability of the bending unit 38.

Due to the possibility of pivoting or rotation of the bending tool 41 about the pivot axis 46 can in this embodiment, the bending unit 38 with a single Bending tool 41 a bending and / or Abkantvorgang both in a direction above the workpiece support level 40 and a direction below the workpiece support level 40 are performed. If the workpiece support plane 40 is used as the basis or zero plane, the pivot axis 46 can be adjusted in the Y direction in both the minus direction and in the plus direction.

Because of this pivoting or adjustment possibility of the bending tool 41 about the pivot axis 46, the bending tool 41 can thus be aligned with the clamping jaws 5, 6 facing bending edge 42 downward in the direction of the first Umformkante at a located above the workpiece support plane 40 position of the pivot axis 46 be. In this position, the sheet metal held in the clamping region 34 or the workpiece 2 to be produced can be formed into a position located below the workpiece support plane 40, in particular be folded.

If the bending tool 41 is adjusted with its pivot axis 46 into a position of the pivot axis 46 located below the workpiece support plane 40, its bending edge 42 facing the clamping jaws 5, 6 can be directed upward in the direction of a corresponding adjustment and / or pivoting movement of the bending tool 41 be aligned to the second forming edge. In this position, with the same bending tool 41, the leg of the workpiece 2 to be formed can be reshaped into a position located above the workpiece support plane 40.

In the present embodiment according to the Fig. 3 the bending beam 43 is formed as a corporeal wave. In this case, the shaft defines the pivot axis 46 for the bending tool 41. Furthermore, the bending tool 41 may be rotatably connected to the shaft or rotatably coupled thereto. This makes it possible, when the shaft is drivingly connected to a pivot drive, not shown, to pivot in its angular position about the pivot axis 46 and / or to rotate. Since the bending tool 41 can be non-rotatably connected to the shaft or can be rotatably coupled thereto, the orientation and position of the bending edge 42 can be effected by means of the pivoting drive to the respective bending and / or bending operation to be performed.

By means of the bending beam guides 44, in this exemplary embodiment, the shaft and thus the bending beam 43 formed by the latter can be adjusted in a translatory adjusting movement in the bending tool adjustment plane 39. The additional rotary pivoting movement and / or rotational movement of the bending tool 41 with its bending edge 42 takes place directly about the pivot axis 46. In the present exemplary embodiment, the rotary movement and / or pivoting movement is transmitted from the pivot drive to the shaft and subsequently to the bending tool 41. In a corresponding, rotationally fixed coupling and / or holder so a universal use of the bending unit 38 can be achieved.

If the position of the bending edge 42 and thus the angular orientation of the bending tool 41 with respect to the workpiece support plane 40 set, can with the forming process, in the present embodiment, with the bending and / or Abkantvorgang begun. As already described above, the bending beam 43 with the bending tool 41 is arranged either below the workpiece support plane 40 or above the workpiece support plane 40 even before the clamped holding of the sheet for the workpiece 2 to be produced. Subsequently, the sheet for the production of the workpiece 2 between the spaced apart arranged jaws 5, 6 is inserted and positioned accordingly. In this position, a leg of the workpiece 2 to be folded off and / or bent is clamped over the forming edges formed on the clamping jaws 5 and / or 6 in the direction of the clamping jaw 3 Bending tool 41 projecting arranged. Subsequently, the alignment of the bending edge 42 of the bending tool 41 in the direction of one of the forming edges of the clamping jaws 5 and / or 6 takes place depending on the bending direction and / or Abkantrichtung to be performed. This alignment is carried out by the above-described pivoting movement of the bending tool 41 about the parallel with respect to at least one of the peripheral edges aligned pivot axis 46th

If this alignment and pre-positioning of the bending edge 42 has been performed on the workpiece 2 to be produced, the adjustment of the bending tool 41 by the longitudinal adjustment of the bending beam 43 along the formed as linear guides bending beam guides 44 of the bending unit 38 in the parallel with respect to at least one of the forming edges aligned bending tool - Plane level 39 towards This is done until an application and / or concern of the bending edge 42 is made to the surface of the workpiece 2 to be produced.

In this position, the actual bending and / or bending process begins. In this case, a further adjustment of the bending tool 41 by the longitudinal adjustment of the bending beam 43 in the bending tool adjustment plane 39 in the same adjustment direction. At the same time, however, the pivoting of the bending tool 41 about the pivot axis 46 can also be carried out, so as to achieve a continuous abutment of the bending edge 42 on the workpiece 2 to be produced. This simultaneous, in particular superimposed adjustment process of the translatory adjustment movement and the rotational adjustment movement takes place until the predetermined bending angle on the workpiece 2 to be produced is reached. As a result of the simultaneous, superimposed adjustment and pivoting movement, it is possible to achieve a stationary contact and / or a rolling of the bending edge 42 of the bending tool 41 on the surface of the workpiece 2.

In order to avoid an elastic spring-back of the truncated leg, it may still be advantageous if, when reaching the predetermined bending angle on the workpiece 2 to be produced, the adjusting movement of the bending tool 41 in the direction of the bending tool adjustment plane 39 is ended and a further pivoting of the bending tool 41 about the pivot axis 46 is performed. This can be done overpressing and after the springback of the exact bending angle can be achieved.

If the bending tool 41 is non-rotatably connected to the shaft and / or rotatably coupled thereto and the shaft drive-connected with a pivot drive, the pivot drive can be designed such that it holds the shaft with respect to their relative position about the pivot axis 46. Positioned by this positional fixing of the bending tool 41 about the pivot axis 46 and thus its bending edge 42, the possibility is created to adjust a bending beam 43 in the bending beam guide 44 while maintaining the distance between the bending edge 42 and the bending tool adjustment plane 39 unchanged.

Furthermore, it may be advantageous if the pivot axis 46 is arranged to extend in the bending work train adjustment plane 39 defined by the bending beam guides 44. So that can an eccentric or off-center arrangement of the pivot axis 46 with respect to the bending beam guides 44 can be avoided.

In the Fig. 4 an optionally independent embodiment of the bending unit 38, in particular its bending tool 41 is shown, wherein for like parts the same reference numerals or component designations as in the preceding Fig. 1 to 3 be used. In order to avoid unnecessary repetition, the detailed description in the previous ones will be used Fig. 1 to 3 referred or referred.

In order to achieve a better and more individual adaptation of the bending tool 41 to different bending processes, in particular bending processes, it can be advantageous if the bending tool 41 comprises a plurality of bending tool elements 47 arranged one behind the other in the longitudinal extent of the pivot axis. This creates the possibility of being able to tune the length of the inserted bending edge 42 of the bending tool 41 to the respective length of the bending region 37 by arranging several bending tool elements 47 one behind the other.

In this case, it is advantageous if the bending tool elements 47 are rotatably connected in mutually different angular positions with the shaft or coupled with this rotation. By choosing the different angular positions relative to one another, some of the bending edges 42 can be used for the bending process, but bending tool elements 47 arranged adjacent thereto are not brought into contact with the workpiece 2 to be produced.

Regardless, it would also be possible that the bending beam 43 itself is designed as a supporting axis and not as a supporting shaft. The axis is held against rotation on the bending beam guide 44 and adjustable even in the bending tool adjustment plane 39 by the bending beam drive 45, as has already been described above for the shaft.

If the bending tool 41 in turn is formed from individual bending tool elements 47, at least some of the bending tool elements 47 can each be drive-connected with their own adjusting drive 48. This creates the opportunity for the individual Biegewerkzeugelemente 47 individually relative to the pivot axis 46 to be able to relocate relative to each other on the supporting axis in rotational adjustment movement. For example, the at least one adjusting drive 48 could be arranged between the supporting axle and the respective bending tool element 47. The adjustment 48 is indicated in simplified dashed lines and may be formed by a wide variety of adjustment and / or drive means. On the representation of the power supply and other drive details was omitted for the sake of clarity.

All information on ranges of values in objective description should be understood to include these arbitrary and all sub-ranges thereof, eg the indication 1 to 10 should be understood to encompass all sub-ranges, starting from the lower limit 1 and the upper limit 10 that is, all portions begin with a lower limit of 1 or greater and end at an upper limit of 10 or less, eg, 1 to 1.7, or 3.2 to 8.1, or 5.5 to 10.

For the sake of order, it should finally be pointed out that for a better understanding of the construction of the production plant 1, in particular its bending press 3, these or their components have been shown partially unevenly and / or enlarged and / or reduced.

REFERENCE NUMBERS

1 manufacturing plant 31 gripping fingers 2 workpiece 32 gripping fingers 3 bending press 33 adjusting plane 4 Tightening tool 34 clamping range 5 lower jaw 35 lower clamping surface 6 upper jaw 36 upper clamping surface 7 machine frame 37 bending area 8th baseplate 38 bending unit 9 side cheek 39 Bending tool adjustment plane 10 side cheek 40 Workpiece support plane 11 cross-dressing 41 bending tool 12 Front face 42 bending edge 13 clamping bar 43 bending beam 14 Front face 44 Bending beam guidance 15 Clamping bar guide 45 Bending beam drive 16 clamping bar 46 swivel axis 17 face 47 Bending tool element 18 face 48 adjustment 19 Jaw recording 20 Jaw recording 21 drive arrangement 22 drive means 23 energy grid 24 S teuervorrichtung 25 input terminal 26 spindle drive 27 actuating means 28 manipulator 29 Stock stack 30 tongs

Claims (16)

1. A bending press (3) for reshaping, in particular bending, a metal sheet into a workpiece (2), comprising a fixed machine frame (7), a lower clamping bar (13) with at least one lower clamping jaw (5) mounted thereon, which at least one a clamping jaw (5) comprises a first forming edge, an upper clamping bar (16) with at least one upper clamping jaw (6) mounted thereon, which at least one clamping jaw (6) has a second forming edge, wherein the upper clamping bar (16) is adjustable on a clamping bar guide (15) by means of a drive arrangement (21) relative to the machine frame (7), in order to clamp the workpiece (2) to be produced between the two clamping jaws (5, 6), and the at least one lower clamping jaw (5) at its end section facing the upper clamping jaw (6) comprises a lower clamping surface (35) and the at least one upper clamping jaw (6) at its end section facing the lower clamping jaw (5) comprises an upper clamping surface (36), wherein the two clamping surfaces (35, 36) in a position bearing against one another define a workpiece bearing plane (40) for the workpiece (2) to be produced, a bending unit (38) with a bending tool (41), which comprises a bending edge (42), and the bending tool (41) is arranged on a bending bar (43), wherein the bending bar (43) can be adjusted on bending bar guides (44) designed in the form of linear guides by means of a bending bar drive (45) relative to the machine frame (7), and the bending tool (41) can be pivoted about a pivot axis (46) aligned parallel to one of the forming edges, characterized in that the bending bar (43) supporting the bending tool (41) is displaceable exclusively on bending bar guides (44) in the form of linear guides along a bending tool adjusting plane (39) both into a position located relative to the workpiece bearing plane (40) above the workpiece bearing plane (40) and into a position located underneath the workpiece bearing plane (40) and also the pivot axis (46) of the bending tool (41) can be moved into a position located both relative to the workpiece bearing plane (40) above the workpiece bearing plane (40) and also a position located underneath the workpiece bearing plane (40), and thereby the bending tool (41) in a position of the pivot axis (46) located above the workpiece bearing plane (40) with its bending edge (42) facing the clamping jaws (5, 6) is aligned downwards in the direction towards the first forming edge and the same bending tool (41) in a position of the pivot axis (46) located below the workpiece bearing plane (40) with its bending edge (42) facing the clamping jaws (5, 6) is aligned upwards in the direction towards the second forming edge.
2. The bending press (3) according to claim 1, characterized in that the bending bar (43) is designed as a supporting shaft and the shaft defines the pivot axis (46) for the bending tool (41).
3. The bending press (3) according to claim 2, characterized in that the bending tool (41) is connected in a rotationally secure manner to the shaft or coupled thereto in a rotationally secure manner.
4. The bending press (3) according to claim 2 or 3, characterized in that the shaft is drive-connected to a pivot drive.
5. The bending press (3) according to claim 4, characterized in that the shaft is held in position by the pivot drive with regard to its relative position about the pivot axis (46).
6. The bending press (3) according to any one of the preceding claims, characterized in that the pivot axis (46) is arranged running in a bending tool-adjusting plane (39) defined by the bending bar guides (44).
7. The bending press (3) according to any one of the preceding claims, characterized in that the bending tool (41) comprises a plurality of bending tool elements (47) arranged behind one another in the longitudinal extent of the pivot axis (46).
8. The bending press (3) according to claim 7, characterized in that the bending tool elements (47) are connected to the shaft in mutually different angular positions in a rotationally secure manner or are coupled thereto in a rotationally secure manner.
9. The bending press (3) according to claim 1 or 6, characterized in that the bending bar (43) is designed as a supporting axis and at least some individual bending tool elements (47) are drive-connected to an adjusting drive (48) respectively.
10. The bending press (3) according to claim 9, characterized in that the at least one adjusting drive (48) is arranged between the supporting axis and the at least one bending tool element (47).
11. The bending press (3) according to one of the preceding claims, characterized in that the bending bar (43) of the bending unit (38) is guided in its spaced apart end sections on the bending bar guides (44) arranged spaced apart from one another in the direction of the forming edges.
12. A method for reshaping, in particular bending, a metal sheet into a workpiece (2), in particular by using the bending press (3) according to any one of the preceding claims, comprising the following steps:

    - arranging a bending unit (38) spaced apart laterally by clamping jaws (5, 6) of a bending press (3), wherein the bending unit (38) comprises a bending tool (41) which is arranged on a bending bar (43) and is pivotable about a pivot axis (46), and the bending bar (43) supporting the bending tool (41) is designed to be displaceable exclusively on bending bar guides (44) in the form of linear guides along a bending tool adjusting plane (39) both into a position located relative to a workpiece bearing plane (40) above the workpiece bearing plane (40) and into a position located underneath the workpiece bearing plane (40) and where either the pivot axis (46) and a bending edge (42) of the bending tool (41) can be arranged above the workpiece (2) to be produced or the pivot axis (46) and the bending edge (42) of the same bending tool (41) below the workpiece to be produced,

    - clamping the workpiece (2) to be produced between the clamping jaws (5, 6) of the bending press (3), wherein a limb of the workpiece (2) to be bent is arranged projecting over the forming edges formed on the clamping jaws (5, 6) towards the bending tool (41);

    - aligning the bending edge (42) of the bending tool (41) in the direction towards the forming edges of the clamping jaws (5, 6) by a pivot movement of the bending tool (41) about the pivot axis (46) aligned parallel to at least one of the forming edges;

    - adjusting the bending tool (41) by means of the longitudinal adjustment of the bending bar (43) along bending bar guides (44) of the bending unit (38) designed as linear guides in the bending tool adjusting plane (39) aligned parallel to at least one of the forming edges in the direction towards the workpiece (2) to be produced and thus placing the bending edge (42) on the workpiece (2) to be produced;

    - further adjusting the bending tool (41) in the bending tool-adjusting plane (39) in the same adjustment direction and simultaneously pivoting the bending tool (41) about the pivot axis (46) until the predetermined bending angle is reached on the workpiece (2) to be produced.
13. The method according to claim 12, characterized in that when reaching the predetermined bending angle on the workpiece (2) to be produced the adjustment of the bending tool (41) in the bending tool-adjusting plane (39) is stopped and a further pivoting of the bending tool (41) is performed about the pivot axis (46).
14. The method according to claim 12 or 13, characterized in that the bending bar (43) is designed as a supporting shaft and the bending tool (41) is arranged on the supporting shaft, wherein the pivot axis (46) for the bending tool (41) is defined by the shaft.
15. The method according to claim 14, characterized in that the bending tool (41) is connected in a rotationally secure manner to the shaft or coupled thereto in a rotationally secure manner.
16. The method according to claim 14 or 15, characterized in that the shaft is drive-connected to a pivot drive.

Images