EP1459815B1 - Bending machine, in particular for sheet metal profile materials - Google Patents

Abstract

The machine has a clamping device with hold-down tool moving relative to a bending table (3) with work piece (1), and a bending cheek (5) for bending punch (18). A driven lockable roller (6) above the table carries a number of rings (7) with radial to tangential cuts or recesses (8). Bearers (9) within the area of the recesses each carry a hold-down strip (2) of different sizes. This permits parts of different widths to be processed by simple turning of the roller.

Description

The invention relates to a folding machine, in particular for sheet metal profile materials, with a Einspannvorichtung, this comprising a hold-down, which performs a relative movement to the bending table and the workpiece recorded there, and with a bending cheek, by means of a drive unit necessary for the deformation of the workpiece movement of a punch or causes a bending pliers, wherein furthermore the hold-down above the bending table and the bending cheek are arranged with drive unit substantially below the bending table, according to the preamble of claim 1.

From the US-A 5,253,498 a swivel bending machine is previously known, the jaw carrier can be rotated or adjusted by a drive and wherein the jaw carrier has different, specifically three jaws. With this arrangement, it should be possible to easily and quickly transfer various jaw tools into a working position so that they can grasp and lock a workpiece securely for bending thereof.
Profile sheets, for example so-called shelf shelf sheets, which already have a fold at their ends, can with such a folding machine, as in the US-A 5,253,498 shown, not edited.

The combination machine with at least two tools according to DE 39 14 762 A1 can also be used for swivel bending. For the local device, it is typical that this can spend on the operation of a changing device different tools in a working position. Therefor the changing device is designed as a rotatably arranged and equipped with the tools component. To set the changing device in the respective working positions, a locking disc is provided, in which engages in the radial direction, a slider whose stop surface extends through the axis of rotation of the locking disc. When changing tools to release the slide is retracted in the radial direction and thus the locking disc released itself. When swivel bending with such a machine, the bending of the workpiece takes place around the center of the radius of the upper tool. The processing takes place in that the workpiece, such as a metal sheet, pressed by means of a Oberwerkzeus or hold-down against the lower plate and the protruding part is bent according to a successful from bottom to top movement. The DE 39 14 762 A1 proposes, in contrast to directly on the bending cheeks attacking drives attached to the table and bending cheek space joint a displaceable over an eccentric arm such that its end engages a lever, which in turn is pivotally attached at its other end to the table. The outer end can then perform a movement on a circular arc, wherein the pivot angle is increased to about 155 ° in order to make a folding of the workpiece can.

Other multifunctional applicable folding machines are for example from the US-A 2,557,346 , of the JP-01289512 A and the JP-01027719 A previously known.
For further state of the art is still on the DE 197 14 833 A1 , the EP 0 603 366 B1 as well as the DE 1 076 608 C directed.

In view of the prior art, it is therefore an object of the invention to provide an advanced folding machine, in particular for sheet metal profile materials, with the help of sheet metal materials with already folded or profiled edges of different width without manual, consuming Niederhalterwechsel can be deformed and wherein the bending process is generally effective and can be done at a reduced cost

The solution of the object of the invention is carried out with a folding machine according to the features of claim 1 or 18, wherein the dependent claims represent at least expedient refinements and developments.

Thus, according to the invention, a clamping device, in particular for sheet-metal profile materials, starts with a clamping device which comprises a holding-down device which performs a relative movement to the bending table and the workpiece received there, for the purpose of locking the workpiece for the bending operation. Furthermore, the folding machine comprises a bending cheek, which causes the necessary movement of a bending punch or a bending pliers for the deformation of the workpiece. Functionally, the hold-down above the bending table and the bending cheek is arranged with drive unit substantially below the bending table.
According to the invention, in a first embodiment, the folding machine comprises a rotatable and lockable roller located above the bending table, substantially over its width, this special roller having a plurality of circular rings spaced along its outer circumference and wherein the annular rings continue radially to tangentially Have recesses or cuts.
In the area of these recesses or incisions extending carrier in the roll longitudinal direction, eg fixed by cloth or adhesion. These carriers each take a hold-down strip. The dimensions of at least a portion of the amount of hold-down strip are different in the roll longitudinal direction to edit sheet metal materials of different width without downholder replacement by rotation of the roll with the hold-down strip located there alone.

For the purpose of adjusting and locking the roller is movably mounted in a guide frame and beyond interchangeable.

The roller can perform a relative movement in its entirety in the direction of the bending table, in order then to fix the workpiece located on the bending table with the respective selected hold-down strip.

In one embodiment of the invention inserts are inserted in the area of the bending table between the hold-down seat and the effective range of the bending punch or the bending pliers, which are e.g. consist of a material of greater hardness, so that the wear resistance is increased in this area of the bending table.

The bending cheek or parts of these can perform both a pivoting movement as well as a linear movement and a combined movement in the direction of the workpiece, for which use known from the prior art drives, in particular electric motors.

The hold-down strips have at their free ends on an inclined surface, which are oriented in the working state in each case substantially parallel to the surface of the bending table or the workpiece.

At the free end of the hold-down strip, substantially opposite the inclined surface, a continuous notch, a groove or a recess is formed, so that there is the possibility to realize bending angle> 90 ° or a fold.

In a further variant of this first embodiment according to the invention, it is provided that along an axis of symmetry of the roller, wherein the axis of symmetry extends as a longitudinal section through the roller center or the roller longitudinal axis, each a pair of hold-downs consisting of opposite hold-down strip is in each case of the same dimensions in the roll longitudinal direction.

In this embodiment, the rotatable and lockable, located above the bending table roller with hold-down pairs can be carried out in a first bending step, a first edge deformation of a sheet material. For a second bending step on the opposite edge of the sheet material, the workpiece is pushed over the bending table after lifting the blank holder and then fixed by means of the second complementary, belonging to the hold-down pair Niederhalterstreifens. The bending cheek then performs with the bending punch located there or the bending pliers an opposite pivoting bending movement and then deforms the other edge of the workpiece.

Accordingly, the bending cheek with bending punch or bending pliers performs a deformation movement in two opposite directions, wherein in the first bending movement of the first hold-down strip and the second bending movement of the second hold-down strip of Niederhalterpaars is in abutment with the workpiece and for deformation at different edges of the workpiece held on the bending table at different positions.

In particular, in the above-described embodiment of the invention, a particularly effective deformation, in particular folding of sheet materials is possible, without the workpiece removed from the bending machine and rotated to bend opposite edges rotated by 180 ° must be introduced back into the bending machine.

For the bending of the first bending edge opposite the second edge only the workpiece must be moved to then fix it in the desired direction with the second hold-down strip of the hold-down pair, which is located on the rotatable roller, so that then via a corresponding movement of the bending cheek the desired bending step is feasible. Alternatively, for the bending of the second edge, the bending table can be displaced by means of provided drives to the middle of the bending roller in order to carry out a further bending step on a further edge.

For the second variant of the first embodiment of the invention, it is expedient for the bending punch or the bending pliers to have a symmetrical shape at least in the head region, since both surfaces of the bending punch come into contact with the workpiece during the respective bending steps of the opposite edges.

Preferably, two inclined surfaces running towards each other are formed in the head region of the bending punch or the bending pliers, or the bending punch has a conical shape in this region.

According to the invention, it is possible to displaceably mount the bending punch in a longitudinal groove of the bending beam and there in the direction of the bending table. To adjust the bending punch in the direction of bending table, at least one rack is arranged in one embodiment at the foot of the punch, which meshes with a drive pinion for sliding movement. In a further embodiment of the invention guide columns with cam rollers are used instead of racks, which are arranged on the punch. As a result of the pivoting movement of the bending beam, the cam rollers inevitably move over fixed curve segments, whereby the desired stroke movement of the punch occurs. By such an embodiment, another drive can be omitted.

In order to minimize the space required for the pivoting bending machine, it is within the meaning of the invention that the pivot drive for the bending beam engages substantially in the cheek center and is arranged within a support frame of the machine.

The length dimensions of the hold-down strips are chosen so that they correspond to the usual standard preparation of sheets or sheet metal profiles.

In the second embodiment of the invention, for the purpose of achieving even higher flexibility, the rotatable hold-down roller is replaced by hold-down cheeks arranged in a V-shape. The almost unlimited flexibility is achieved here by segmenting the hold-down cheeks. On the outside of the V-shaped hold-down cheeks, in each case motor-driven linear units with integrated pneumatic cylinders and locking or unlocking claws are arranged. By accurately positioning the locking or unlocking claws on the profile width of the sheet material to be machined, the corresponding Hold-down segments are pulled and there are the necessary free space for the profile width to be machined.
The reciprocal lifting movement of the two hold-down cheeks is achieved by the coupling of a drive pinion, each with a rack-gear combination.

It should be noted at this point that the above-described embodiments of the pivoting bending machine according to the invention are particularly suitable for damage-free bending of painted or powder-coated sheets. Here is a particularly gentle unwinding of the punch.

The invention will be explained below with reference to exemplary embodiments and with the aid of figures.

Fig. 1

eine erste Variante einer ersten Ausführungsform der erfindungsgemäßen Schwenkbiegemaschine;

Fig. 2

eine zweite Variante der ersten Ausführungsform mit Niederhalterpaaren und einer in zwei Richtungen verschwenkbaren Biegewange, wobei in jeder Richtung eine Biegeaktivität an einer jeweiligen Werkstückkante ausführbar ist;

Fig. 3

eine Ausführungsform gemäß Fig. 2, jedoch mit Kurvenrollenatrieb;

Fig. 4

eine Schnitt-Seitenansicht einer zweiten Ausführungsform mit V-förmig angeordneten Niederhaltewangen und

Fig. 5

eine Darstellung der Biegemaschine der zweiten Ausführungsform in Vorderansicht.

Hereby show:

Fig. 1

a first variant of a first embodiment of the pivoting bending machine according to the invention;

Fig. 2

a second variant of the first embodiment with hold-down pairs and a bending cheek pivotally in two directions, wherein in each direction a bending activity at a respective workpiece edge is executable;

Fig. 3

an embodiment of Figure 2, but with Kurvenrollenatrieb.

Fig. 4

a sectional side view of a second embodiment with V-shaped hold down cheeks and

Fig. 5

an illustration of the bending machine of the second embodiment in front view.

In the sectional views according to the figures, a machine base 21 receives a support frame 22. On the support frame 22 of the bending table 3 is located, on which the workpiece 1 to be machined, for example a metal profile material, is deposited.

A guide frame 10 carries on lateral, not shown receiving devices, the rotatable roller 6, which is also adjustable in height. This can be carried out on the guide frame 10, a lifting movement of the roller 6.

The bending cheek 5 can be pivoted about an axis extending out of the figure, for which purpose a drive unit 4 is provided which has at least one electric motor 20.

At the workpiece 1 pointing end of the bending cheek 5, this has a punch 18, which enters into frictional engagement with the workpiece 1 during the bending process to cause the desired deformation of the workpiece 1.

In the longitudinal direction, the roller 6 comprises several there, e.g. attached by adhesion or positive engagement circular rings 7 or similar elements. In the circular rings 7 recesses 8 are incorporated, which receive a metallic carrier 9. Thus, the carrier 9 connect the individual circular rings 7, so that an overall stable structure is formed, which is able to receive the individual hold-down strip 2. The hold-down strips 2 may e.g. be connected to the respective carrier 9 by screwing and are easily interchangeable in this way in case of repair.

According to the invention, the hold-down strips 2 each have a different width. This makes it possible, after inserting a sheet-metal profile material as a workpiece 1, which already has, for example, two lateral folds to reshape it at the third edge by such a hold-down strip is selected with such a width by turning the roller 6, the clear distance between the already existing folds and thus the workpiece width corresponds.

By the measure described above, the folding machine can be used very universally, without downtime caused by unnecessary retooling by replacing the hold-down.

2, in contrast to the solution according to FIG. 1, has a bending cheek 5 which is capable of performing a deformation of a workpiece 1 located on the bending table 3 during a reciprocating movement.

Along the imaginary axis of symmetry 14, which runs through the center or the longitudinal axis of the local roller 6, hold-down pairs 15 are provided in each case. In each case, a hold-down pair 15 has the same length or width of the hold-down strip 2.

After, as shown in FIG. 2, a first bending of the workpiece 1 has been carried out, the roller 6 and thus the corresponding blank holder 2 is raised via the guide frame 10. The workpiece 1 can then be moved over the bending table 3 according to FIG. 2 to the left and thus reaches a position in which the opposite end of the workpiece 1 is deformable. For this second deformation step, the bending punch 18 of the bending cheek 5 moves from its left-side pivot position to the right-side position.

For the purpose of carrying out the respective bending step, in a first embodiment the bending punch 18 is displaceable in a longitudinal groove 17 of the bending cheek 5 and has in the foot region a toothed rack 19 which meshes with a corresponding toothed wheel, which in turn is connected to a drive unit.

The head portion 16 of the punch 18 has inclined surfaces or a cone shape. An inclined surface 12 continue to have the hold-down strip 2. A groove or a recess 13 in the hold-down strip 2 ensures that bending angle realized> 90 ° or even the execution of a fold can be done.

The respective hold-down strip 2 of the hold-down pair 15 for fixing the workpiece 1 during bending of the first and second edge is achieved by turning the roller 6 back and forth and the required vertical movement over the guide frame 10.
In the embodiment of Fig. 2, it is no longer necessary that the workpiece 1 must be removed for performing a fold on two opposite sides of the sheet material and must be re-introduced into the machine after rotation. It is only necessary to move over the bending table 3. After that can take place on the approach of the respective further hold-down strip of the hold-down pair and pivoting back the bending cheek 5 with punch 18 of the desired Abkantschritt.

In the embodiment according to FIG. 3, a device is assumed to be essentially analogous to that described with reference to FIG. 2. In contrast to this pivoting bending machine is assumed in the embodiment of FIG. 3 of a modified lifting movement of the punch in the direction of the workpiece. Instead of racks here two guide columns are arranged with cam rollers on the punch. As a result of the pivoting movement of the bending beam, the cam rollers inevitably move over existing curve segments, whereby the lifting movement of the punch is achieved in the desired manner. It can therefore be dispensed with by the cam roller drive 23 on the rack / Zahnritzelpaarung with further electric motor of FIG.

4 is a sectional side view of a second embodiment of the folding machine with V-shaped hold-down cheeks shown.

These V-shaped arranged, as shown in Fig. 5 recognizable segmented hold-down tools 24 are each held vertically movable by a support member 25, which is part of the guide frame 10.

The segmented hold-down tools 24 extend across the width of the bending table (see Fig. 5), each segment individually and depending on processing width of the workpiece 1 from a locking position in a tool position can be converted by unlocking.

For the purpose of unlocking a locking wedge 26 is provided, which releases a driver 27.

The unlocking takes place e.g. via a jaw arrangement which can be activated via an actuating device. This actuator may be in the form of a pneumatic or hydraulic cylinder arrangement.

On the outside of the hold-down tools, the at least one longitudinal drive device 28 is provided, with the aid of which the aforementioned start-up of the respective segment is possible. This longitudinal drive device 28 is e.g. moved over an array of servomotor and gearbox by means of a rotating worm shaft across the width of the bending table 3. The movement of the two respective longitudinal actuation devices 28 according to FIG. 5 on the left and right sides can take place synchronously in opposite directions, but also discretely or individually.

The mutual lifting or lowering movement of each approached segments carried by a common drive with coupling gear 29 and associated racks 30. The width of the segments of the hold-down tool is approximately in the range between 20 mm and 30 mm, preferably 25 mm, so that a good adaptability to the respective bending or bending task, ie the profile width e.g. in the range between 300 mm and 1500 mm can be achieved.

The common inventive principle between the first and the second embodiment on the one hand with Niederhalterwalzenanordnung and on the other hand with V-shaped Niederhalterwerkzeugen is considering either segmental quasi Walzenaußenumfangsseitig or make across the width with disc-shaped segments, with the respective segmentation a slight adaptability of Swivel bending machine without time-consuming and expensive changeover times is possible.

It should be noted at this point that the embodiment of the bending cheek with bending punch or bending pliers for performing a deformation movement in the second embodiment of the invention analogous to that, as described for the first embodiment, is executed. In this respect, attention is drawn to the avoidance of repetition on the relevant parts of description.
The same applies to the special design of the strip-shaped ends of the hold-down, ie the hold-down strip having an inclined surface at its free ends, which is oriented in the working state in each case substantially parallel to the surface of the bending table or the workpiece. These free ends of the hold-down strip also have in the second embodiment of the invention, substantially opposite to the inclined surface, a continuous edge, a groove or a recess. Due to the V-shaped arrangement of the segmented hold-down tools, it is also possible that along an axis of symmetry each consisting of opposite hold-down strip down pair is provided with the same dimensions in the longitudinal direction of the table.

LIST OF REFERENCE NUMBERS

1

workpiece

2

Down strips

3

bending table

4

drive unit

5

bending beam

6

roller

7

annulus

8th

return

9

carrier

10

guide frame

11

insert

12

sloping surface

13

Groove or recess

14

axis of symmetry

15

Down device pair

16

head area

17

longitudinal groove

18

punch

19

rack

20

electric motor

21

foot

22

supporting frame

23

Cam roller drive for the punch

24

segmented hold-down tools

25

supporting part

26

locking wedge

27

takeaway

28

Longitudinal drive means

29

coupling gear

30

rack

Claims (22)

1. A bending machine, in particular for sheet metal profile materials having a bending table as well as a clamping device comprising a hold-down device which realizes a movement relative the bending table (3) and the workpiece (1) accommodated there, as well as a bending cheek (5) which effects the movement of a bending punch (18) or bending pliers necessary to deform the workpiece (1), wherein the hold-down device is further arranged above the bending table (3) and the bending cheek (5) with a drive unit (4) is arranged substantially beneath the bending table (3),
   characterized in that
   a plurality of spaced circular rings (7) are arranged on a rotatable and lockable roller (6) disposed above the bending table (3), essentially extending across the width of its outer periphery, wherein said circular rings (7) exhibit radial to tangential extending recesses (8) or slots, and supports (9) further fixed in the area of the recesses (8) or slots in the longitudinal direction of the roller, wherein said supports (9) each receive a hold-down strip (2) and the dimensions of at least one section of a hold-down strip (2) differ in the longitudinal direction of the roller in order to be able to process sheet metal material of different widths without needing to exchange the hold-down device just by rotating the roller (6) with the hold-down strips (2).
2. The bending machine according to claim 1,
   characterized in that
   the roller (6) is movably supported in a guide frame (10) and interchangeable.
3. The bending machine according to claim 1 or 2,
   characterized in that
   an adapter (11) is inset in the area of the bending table (3) between the seat of the hold-down device and the active area of the bending punch (18) or bending pliers.
4. The bending machine according to any one of the preceding claims,
   characterized in that
   the bending cheek (5) or part of same realizes a pivoting motion as well as a linear motion toward the workpiece (1).
5. The bending machine according to any one of the preceding claims,
   characterized in that
   the hold-down strips (2) exhibit an inclined surface (12) at their free ends which is oriented substantially parallel to the surface of the bending table (3) or the workpiece (1) in the working state.
6. The bending machine according to claim 5,
   characterized in that
   a continuous notch, groove or recess (13) is configured essentially opposite the
   inclined surface (12) at the free ends of the hold-down strips (2).
7. The bending machine according to any one of the preceding claims,
   characterized in that
   a pair of hold-down devices (15) both having the same dimensions in the longitudinal direction and comprised respectively of opposing hold-down strips (2) is disposed along an axis of symmetry (14) extending through the center, the longitudinal axis respectively, of the roller (6).
8. The bending machine according to claim 7,
   characterized in that
   the bending cheek (5) with bending punch (12) or bending pliers realizes a deforming motion in two opposite directions and in a first bending motion, the first hold-down strip (2), and in the second bending motion, the second hold-down strip (2) of the pair of hold-down device strips (15) is moved up against the workpiece (1) as well as held at different positions for deforming different edges of the workpiece (1) on the bending table (3).
9. The bending machine according to claim 7 or 8,
   characterized in that
   the head region of the bending punch (18) or bending pliers exhibits a symmetrical design.
10. The bending machine according to claim 9,
    characterized in that
    two converging inclined surfaces are configured in the head region of the bending punch (18) or bending pliers.
11. The bending machine according to any one of claims 7 to 10,
    characterized in that
    the bending punch (18) is mounted in a longitudinal groove of the bending cheek (5) to be displaceable in the direction of the bending table (3).
12. The bending machine according to claim 11,
    characterized in that
    at least one gear rack (19) is arranged at the base of the bending punch (13) which engages with a drive pinion for the displacing movement.
13. The bending machine according to any one of the preceding claims,
    characterized in that
    the pivot drive for the bending cheek (5) essentially engages mid-cheek.
14. The bending machine according to any one of the preceding claims,
    characterized in that
    the dimensions of the hold-down strips (2) correspond to conventional standard widths for sheet metal or sheet metal profiles.
15. The bending machine according to any one of the preceding claims,
    characterized in that
    the drive units comprise electromotors (20).
16. The bending machine according to claim 11,
    characterized in that
    the bending punch (12) is exchangeable and/or various differently-formed, hardened inserts (11) can be arranged in the head region.
17. The bending machine according to claim 11,
    characterized in that
    the bending punch (18) is forced to realize a relative movement to workpiece (1) by means of a cam roller drive (23) upon the pivotal motion of the bending cheek (5).
18. A bending machine, in particular for sheet metal profile materials having a bending table (3) as well as a clamping device comprising a hold-down device which realizes a movement relative the bending table (3) and the workpiece (1) accommodated there, as well as a bending cheek (5) which effects the movement of a bending punch (18) or bending pliers necessary to deform the workpiece (1), wherein the hold-down device is further arranged above the bending table (3) and the bending cheek (5) with a drive unit (4) is arranged substantially beneath the bending table (3),
    characterized in that
    the hold-down device consists of a plurality of V-shaped hold-down dies (24) in segmented arrangement across the width of the bending table (3), wherein each segment can be released so as to be individually shifted from a locked position into a die position according to the width of the sheet metal profile to be processed,
    at least one longitudinal drive device (18) is provided at the exterior of the hold-down dies (24) respectively in order to move the respective segments, and an actuating device (26, 27) is further provided in the longitudinal drive devices (28) to release or lock the respectively- displaced segment, and
    the alternating lifting or lowering movement of the respectively displaced segment is effected by a common drive with coupling gear (29) and gear rack (30).
19. The bending machine according to claim 18,
    characterized in that
    the width of the segments are essentially in the range of between 20 mm to 30 mm, preferably at 25 mm.
20. The bending machine according to claim 18 or 19,
    characterized in that
    the actuating device (26, 27) comprises a pneumatic or hydraulic cylinder.
21. The bending machine according to any one of claims 18 to 20,
    characterized in that
    hold-down strips (2) are disposed on the segments.
22. The bending machine according to claim 21,
    characterized in that
    the hold-down strips (2) exhibit an inclined surface at their free ends which is oriented substantially parallel to the surface of the bending table (3) or the workpiece (1) in the working state, wherein a continuous notch, groove or recess (13) is configured essentially opposite the inclined surface at the free ends of the hold-down strips (2).

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