EP2641668A1 - Sheet metal bending machine - Google Patents

Abstract

The machine has a bending tool (1) e.g. stamper, comprising multitude planar bending plates (2) connected with each other at plate packets, oriented parallel to each other and aligned against each other. Edges of the bending plates form a general cylindrical bending profile in a mold region (3). The bending plates are aligned parallel to a cylindrical bending profile generation part (4). The stamper and/or a die plate are formed by the plate packets. An upper beam is formed by the plate packets. The bending plates are adjusted transverse to the generation part.

Description

The invention relates to a sheet metal bending machine with a bending tool, which comprises a plurality of planar juxtaposed, mutually parallel aligned and connected to a disk set Biegellamellen whose edges form a generally cylindrical bending profile in a molding area.

Such sheet metal bending machines are in principle from the WO 2010/022426 A1 , of the DE 44 09 556 A1 and the US 5,878,619 A known. These reveal bending tools, in particular for the Gesenkbiegen, in the form of a punch and / or a Biegegesenkes from a package of composite lamellae. The lamellae are lined up in the direction of a bending axis of the tool one behind the other flat and assembled into a package, for example screwed.

A disadvantage of these known bending tools is that they can be used in each case only for a certain bending radius. If workpieces with different bending radii are to be produced, then the bending tools must be exchanged, which results in a high expenditure of time for the conversion of the sheet metal bending machine. In addition, separate lamellae must be made for each bending radius.

The object of the invention is therefore to provide an improved sheet metal bending machine, in particular one that is universally applicable.

The object of the invention is achieved by a sheet metal bending machine of the type mentioned, in which the bending blades are aligned parallel to a generatrix of the cylindrical bending profile.

This ensures that the bending tool can be adjusted to each other by appropriate positioning of the slats to different requirements. The lamellae form along a workpiece-facing edge a molding area with a generally cylindrical bending profile. As a result, on the one hand different bending radii (for example in a range of 50-150 mm) can be provided by the molding area is set to a circular cylindrical bending profile, or even bending profiles of general shape, such as wave-shaped bending profiles are set.

The sheet metal bending machine can be designed, for example, as a press bending machine or press brake, whose punch and / or its die is formed by said disk set / are. In die bending (also referred to as "folding"), the sheet to be bent is placed on a die (also referred to as a "die") with a V-shaped opening. By the downward movement of the punch (also referred to as "upper tool" or "sword"), then the sheet metal forming takes place. With the help of the proposed disk pack different shapes, in particular different bending radii, can be set for punch and / or die.

However, the plate bending machine can also be designed as a folding machine whose upper cheek is formed by said plate set. When swivel bending the sheet to be bent between a "upper beam" and a "lower beam" is clamped and then bent the free end with the help of a "bending beam" to the upper beam. With the help of the proposed plate package different shapes, in particular different bending radii, can be set for the upper beam.

As "slats" relatively thin plates are referred to in the invention compared to their extent, which combined to form a "disk pack", that is stacked, be. At least one edge of each Biegelamelle faces the workpiece to be bent. The totality of these edges of several or all lamellae forms a molding area with a generally cylindrical bending profile.

In the context of the invention, "generally cylindrical" means a shape that arises by displacement of a flat surface or a curve along a straight line transversely to said plane. One speaks in this context of "extrusion". The straight lines which lead away from the edge of the flat surface or the curve in the direction of displacement are called "generators". In a simple case, the bending profile is formed by a circular arc segment, which is expanded to a cylinder jacket segment. The bending tool then has a bending radius in the molding area.

Further advantageous embodiments and modifications of the invention will become apparent from the dependent claims and from the description in conjunction with the figures.

It is favorable if the bending blades are permanently connected to each other. This prevents the Biegellamellen slip during operation of the sheet metal bending machine or when handling the bending tool against each other. By virtue of the fact that said disk pack is suitable for realizing a large number of bending profiles, different bending profiles can be produced with a plurality of identical sets of disks, in contrast to the disk packages known from the prior art, in which only one specific bending profile can be selected from a set of disks can be produced. For example, the bending blades of the disk pack can be welded.

It is advantageous if the bending blades are adjustable transversely to a generatrix of the cylindrical bending profile and the sheet bending machine comprises a tensioning device which presses the bending blades against each other. In this way it is possible to realize a plurality of bending profiles with only one disk pack. For example, the slats can be screwed into a package.

It is particularly advantageous in this context if the bending blades are adjustable during operation of the sheet metal bending machine, that is, the disk set for setting does not have to be removed from the sheet metal bending machine. For example, screws for clamping the disk pack can also serve but also pneumatically, hydraulically, electrically or manually operated clamping devices.

It is particularly advantageous if the sheet metal bending machine is equipped or can be equipped with a profile gauge which can be brought into contact with the disk pack in the molding area or an inverse molding area opposite the molding area. As a result, the slats can be easily brought into position. For example, the profile gauge consist of an elongated cuboid, in the top of a hollow cylindrical groove (ie, a negative profile) is incorporated. If this profile gauge is brought into position in the forming area of the bending tool (in the case of a bending punch of a press brake, that is, below the punch, which is usually arranged above the die), the profile of the profile gauge can be transferred to the bending tool. However, it is also possible for the profile gauge to be brought into contact with the lamellae in an inverse-shaped area opposite the molding area (in the case of the already mentioned bending punch, that is to say on its upper side). The profile gauge is provided with a positive profile, which is then transferred to the slats.

It is advantageous if the bending blades are rounded in the molding area. In this way, a multiplicity of bending profiles can be realized with the disk pack without the individual disks pressing too strongly into the workpiece.

In a favorable embodiment of the sheet metal bending machine, the disk set comprises at least three bending blades, in a more favorable embodiment, at least five bending blades and, in an even more favorable embodiment, at least seven bending blades. In this way, in particular bending radii can be approximated well. In general, the higher the number and the smaller the thickness of the bending blades, the closer a predetermined bending profile can approximate.

It is advantageous if the bending blades touch each other directly. As a result, the shearing force generated during the bending operation between the bending blades is transferred particularly well between them. It is also conceivable, of course, that further elements are arranged between the individual bending blades, for example thin plates made of a material with a high coefficient of friction. Preferably, this material also has a high shear modulus and high shear strength.

It is particularly advantageous if a bending blade is roughened on its contact surface to an adjacent bending blade and / or has a toothing, in particular a micro-toothing, and / or a groove structure or groove structure. As a result, the resulting shear forces in the disk set can be transferred well, or the necessary clamping force can be kept comparatively low. Preferably, a toothing or a groove or groove structure for this purpose is aligned parallel to the generatrix of the bending profile.

It is favorable if the bending blades have substantially identical external dimensions. As a result, the bending tool can be produced particularly efficiently.

It is also beneficial if the Biegellamellen are the same thickness. This is another measure for the particularly efficient production of the bending tool. Of course, the slats can also be different in thickness.

Finally, it is particularly advantageous if the bending blades are wedge-shaped, tapered away from the mold area. In this way, a displacement of the bending blades with each other can be effectively avoided, since the Biegellamellen are increasingly pressed against each other due to the wedge effect with increasing (bending) pressing pressure.

Fig. 1

eine schematische Variante eines Biegewerkzeugs mit Biegelamellen in Schrägansicht;

Fig. 2

eine schematisch dargestellte Gesenkbiegemaschine mit einem Biegewerkzeug mit Biegelamellen vor dem Biegevorgang;

Fig. 3

die Gesenkbiegemaschine aus Fig. 2 nach dem Biegevorgang;

Fig. 4

eine schematisch dargestellte Schwenkbiegemaschine mit einem Biegewerkzeug mit Biegelamellen nach dem Biegevorgang;

Fig. 5

eine Profillehre zur Übertragung eines kleinen Biegeradius auf das Biegewerkzeug;

Fig. 6

eine Profillehre zur Übertragung eines großen Biegeradius auf das Biegewerkzeug;

Fig. 7

eine Profillehre zur Übertragung eines wellenförmigen Biegeprofils auf das Biegewerkzeug;

Fig. 8

eine Profillehre, welches in einem Invers-Form-Bereich mit dem Biegewerkzeug in Kontakt gebracht wird;

Fig. 9

ein Biegewerkzeug mit verschraubten Biegelamellen;

Fig. 10

ein Biegewerkzeug mit einer hydraulischen Spannvorrichtung und

Fig. 11

ein Biegewerkzeug mit keilförmigen Biegelamellen.

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

Fig. 1

a schematic variant of a bending tool with Biegellamellen in an oblique view;

Fig. 2

a schematically illustrated Gesenkbiegemaschine with a bending tool with Biegellamellen before the bending process;

Fig. 3

the Gesenkbiegemaschine from Fig. 2 after the bending process;

Fig. 4

a schematically illustrated folding machine with a bending tool with Biegellamellen after the bending process;

Fig. 5

a profile gauge for transmitting a small bending radius on the bending tool;

Fig. 6

a profile gauge for transmitting a large bending radius on the bending tool;

Fig. 7

a profile gauge for transmitting a wave-shaped bending profile on the bending tool;

Fig. 8

a profile gauge, which is brought into contact with the bending tool in an inverse-molding area;

Fig. 9

a bending tool with screwed Biegellamellen;

Fig. 10

a bending tool with a hydraulic tensioner and

Fig. 11

a bending tool with wedge-shaped bending blades.

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 location information chosen in the description, such as top, bottom, side, etc. related to the immediately described and illustrated figure and are to be transferred to the new situation mutatis mutandis when a change in position. Furthermore, individual features or combinations of features from the illustrated and described different embodiments may represent for themselves, inventive or inventive solutions.

All statements on ranges of values in the description of the present invention should be understood to include any and all sub-ranges thereof, e.g. is the statement 1 to 10 to be understood that all sub-areas, starting from the lower limit 1 and the upper limit 10 are included, ie. all subregions begin with a lower limit of 1 or greater and end at an upper limit of 10 or less, e.g. 1 to 1.7, or 3.2 to 8.1 or 5.5 to 10.

Fig. 1 shows a schematic variant of a bending tool 1 in an oblique view. The bending tool 1 comprises a plurality of planar juxtaposed, mutually parallel and mutually connected to a disk set Biegellamellen 2. Their edges form a generally cylindrical bending profile in a mold section 3, wherein the Biegellamellen 2 are aligned parallel to a generatrix 4 of the cylindrical bending profile. Furthermore, the bending tool 1 also includes a holding portion 5, on which it, for example can be clamped in a bending machine. By providing a circular cylindrical bending profile on the one hand different bending radii (see also the FIGS. 5, 6 and 8 ), but it is also possible bending profiles of general shape, for example elliptical, parabolic or wave-shaped bending profiles (see also Fig. 7 ).

The FIGS. 2 and 3 now show how the bending tool 1 from the Fig. 1 can be used in a Gesenkbiegemaschine 6. In this example, it is assumed that the punch / the sword of the Gesenkbiegemaschine 6 is formed by the disk set. It would also be conceivable, of course, that the die 8 is formed in a similar manner as the stamp 1 by a disk set. In the in Fig. 2 shown state is the still unbent workpiece 7 on the die 8 of the Gesenkbiegemaschine 6. In the Fig. 3 the punch 1 was moved in the direction of the die 8, so that the workpiece 7 has deformed accordingly.

The Fig. 4 further shows that the bending tool 1 from the Fig. 1 can also be used in a pivoting bending machine 9. In this example, it is assumed that the upper beam of the pivoting bending machine 9 is formed by a disk set 1. In the Fig. 4 is shown a state in which between the upper beam 1 and the lower beam 10 clamped workpiece 7 has already been bent by a pivoting movement of the bending beam 11.

By appropriately positioning the slats 2 to each other, the bending tool 1 can be easily adjusted to different requirements. In particular, different bending radii can be adjusted. The Fig. 5 shows a profile gauge 12, which can be brought into contact with the disk set 1 in the molding area 3, so that the shape of the profile gauge 12 is transmitted to the disk set 1. For this purpose, the profile gauge 12 is brought under the disk set (sword) 1 in position and this lowered afterwards. Equally, of course, the profile gauge 12 could be raised to transmit the profile on the disk pack 1. Fig. 6 additionally shows a profile gauge 12 with a slightly larger radius. As can be seen from the figures, the disk set 1 can be adjusted very quickly to different bending radii. It is advantageous that the sword 1 remain in the bending press 6 and the upper beam 1 in the folding machine 9 can and must not be expanded. The bending lamellae 2 are thus adjustable during operation of the sheet metal bending machine 6, 9.

The adjustment is by no means limited to different radii, such as Fig. 7 demonstrated. In this example, the profile gauge 12 has a wave profile. This is between sword 1 and die 8, which is also constructed in this example of a disk set in position, and the sword 1 and the die 8 then moved towards each other to the profile of the profile gauge 12 on the sword 1 and the die transferred to. In this way, the workpiece 7 can be provided, for example with a wave profile. The Gesenkbiegemaschine 6 is thus even more universal.

From the Fig. 7 It is also clear that the bending lamellae 2 can be the same thickness or different thicknesses and that a lamella packet 1 can have an even or odd number of bending lamellae 2. Furthermore, it can be seen that the bending blades 2 are not necessarily rounded in the form of area 3, even if this is advantageous in that then no or only small impressions of the bending tool 1 are formed in the workpiece 7.

Fig. 8 finally shows that the profile gauge 12 can be brought into contact with the sword 1 in an inverse molding area 13 opposite the molding area 3. In this case, the sword 1 is moved upwards and / or the profile gauge 12 down to transmit the profile of the profile gauge 12 to the sword 1.

In particular, for the last-mentioned variant, it is advantageous if the bending blades 2 have substantially identical outer dimensions, in particular the same height. However, identical outside dimensions also offer advantages in the production of the bending tool 1, since the lamellae 2 can be produced particularly efficiently in this case.

In general, the Biegellamellen 2 adjustable or permanently connected to each other, for example, be welded or glued. By joining rectangular plates of identical size bending tools 1 can be made particularly efficient with any bending profile.

In order to increase the flexibility of the bending tool 1, the bending lamellae 2 can also be adjustable transversely to a generatrix 4 of the cylindrical bending profile. Fig. 9 shows a variant of the bending tool 1, in which the blades 2 are screwed together by means of screws 14 and nuts, not shown. When adjusting the screws 14 are released, so that the Biegellamellen 2 against each other, or the screws 14 can be moved in the slots 15. For the bending process, the screws 14 are then tightened again.

In order that the bending lamellae 2 do not slip against one another during bending, a bending lamella 2 can be roughened at its contact surface to an adjacent bending lamella 2 and / or have a toothing, in particular a micro-toothing, and / or a groove structure or groove structure, as described in US Pat Fig. 9 is shown. It is easy to see that the Biegellamellen have 2 horizontally extending grooves to prevent slipping of the Biegellamellen 2 or at least complicate.

In the illustrated variant, the Biegellamellen 2 touch each other directly. This is by no means absolutely necessary. It is also conceivable that between the Biegellamellen 2 intermediate plates are inserted, preferably made of a material with a high coefficient of friction, high shear modulus and high shear strength.

At this point it is noted that the pressing of the upper beam 1 against the lower beam 10 in a pivoting bending machine 9 has a positive effect on the cohesion of the disk set 1, since the contact pressure also counteracts a displacement of the Biegellamellen 2.

Fig. 10 further shows an example in which the sheet metal bending machine 6, 9 comprises a clamping device which presses the bending blades 2 against each other. Specifically, two hydraulic cylinders 16 are arranged on the bending tool 1, which press the Biegellamellen 2 via lever 17 against each other to prevent slippage thereof during the bending operation.

Of course, the in Fig. 10 shown variant purely illustrative, and there are still a number of jigs conceivable. For example, the hydraulic cylinders 16 are exchanged against spindle drives. It is also conceivable that the lever 17 are arranged differently or even omitted, for example, when the hydraulic cylinders 16 are arranged horizontally and press directly on the disk set 1, as well as in the Fig. 11 variant shown is the case. For example, the bending tool in this case can be rigidly installed in a frame of a plate bending machine 6, 9 and accordingly the die 8 or the lower cheek 10 can be designed to be movable. In the variant after Fig. 11 the bending lamellae 2 are additionally wedge-shaped, tapering away from the molding area 3. In this way, a displacement of the bending lamellae 2 with each other can also be prevented.

The embodiments show possible embodiments of a bending tool according to the invention 1 respectively a bending machine 6, 9, wherein it should be noted at this point that the invention is not limited to the specifically illustrated embodiments of the same / same, but also various combinations of the individual embodiments are possible with each other and this possibility of variation is due to the teaching of technical action by objective invention in the skill of those skilled in this technical field. So are all conceivable embodiments, which are possible by combinations of individual details of the illustrated and described embodiment variant, includes the scope of protection. For example, a screw connection after Fig. 9 even with wedge-shaped Biegellamellen 2, as in Fig. 3 are shown, be provided. In general, the variants shown for a punch 1 of a Gesenkbiegemaschine 6 are fully applicable for the die 8 and also for the upper beam 1 of a folding machine 9. The holding portion 5 is not necessarily designed as in the Fig. 1 is shown, but may also have a shape adapted to the respective bending machine 6, 9 or omitted altogether, for example in the in Fig. 11 illustrated variant.

In particular, it should be noted that in reality the illustrated devices may also comprise more or fewer components than shown and are sometimes shown in greatly simplified form in the figures.

For the sake of the order, it should finally be pointed out that the illustrated devices as well as their components have also been shown partly out of scale and / or enlarged and / or reduced in size for a better understanding of their design.

The task underlying the independent inventive solutions can be taken from the description.

REFERENCE NUMBERS

1

Bending tool (e.g., punch or bending cheek)

2

flexion blades

3

shape area

4

Generating the cylindrical bending profile

5

holding area

6

press brake

7

workpiece

8th

die

9

Folding Machine

10

lower beam

11

bending beam

12

profile teaching

13

Inverse Shape area

14

screw

15

Long hole

16

hydraulic cylinders

17

lever

Claims (14)

Sheet bending machine (6, 9) with a bending tool (1) comprising a plurality of flat aligned, mutually parallel and mutually connected to a disk set Biegellamellen (2) whose edges form a generally cylindrical bending profile in a molding area (3),
characterized,
in that the bending blades (2) are aligned parallel to a generatrix (4) of the cylindrical bending profile. Sheet bending machine (6) according to claim 1, characterized in that it is designed as a Gesenkbiegemaschine (6), the punch (1) and / or the die (8) is formed by said disk set is / are. Sheet bending machine (9) according to claim 1, characterized in that it is designed as a folding machine (9) whose upper cheek (1) is formed by said disk set. Sheet bending machine (6, 9) according to one of claims 1 to 3, characterized in that the bending lamellae (2) are permanently connected to each other. Sheet bending machine (6, 9) according to one of claims 1 to 3, characterized in that the bending blades (2) are adjustable transversely to a generatrix (4) of the cylindrical bending profile and the sheet bending machine (6, 9) a tensioning device (14, 16, 17) which presses the Biegellamellen (2) against each other. Sheet bending machine (6, 9) according to claim 5, characterized in that the bending blades (2) during operation of the sheet bending machine (6, 9) are adjustable. Sheet bending machine (6, 9) according to any one of the preceding claims, characterized by a profile gauge (12), which with the disc pack (1) in the molding area (3) or a inverse mold area (13) opposite the mold area (3) Contact can be brought. Sheet bending machine (6, 9) according to one of the preceding claims, characterized in that the bending lamellae (2) in the molding area (3) are rounded. Sheet bending machine (6, 9) according to any one of the preceding claims, characterized in that the disk set (1) comprises at least three bending blades (2). Sheet bending machine (6, 9) according to one of the preceding claims, characterized in that the bending blades (2) touch each other directly. Sheet bending machine (6, 9) according to one of the preceding claims, characterized in that a Biegelamelle (2) is roughened at the contact surface to an adjacent Biegelamelle (2) and / or a toothing, in particular a micro-toothing, and / or a groove structure or groove structure having. Sheet bending machine (6, 9) according to any one of the preceding claims, characterized in that the Biegellamellen (2) have substantially identical outer dimensions. Sheet bending machine (6, 9) according to any one of the preceding claims, characterized in that the Biegellamellen (2) are the same thickness. Sheet bending machine (6, 9) according to one of claims 1 to 12, characterized in that the bending lamellae (2) are wedge-shaped, tapered away from the mold area (3).

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