EP3403738B1 - Sheet metal bending machine - Google Patents

Description

TECHNICAL AREA

The present invention relates to a sheet metal bending machine with a lower machine part and an upper machine part, which are arranged to be movable relative to one another in a feed direction of a workpiece to be bent, with a lower holding beam and with a lower bending beam, which are assigned to the lower machine part, with an upper holding beam and with an upper bending beam, which is assigned to the upper machine part, wherein the four beams are aligned transversely to said feed direction and the workpiece to be bent can be inserted between said four beams between the machine parts, wherein the upper retaining beam is in a first clamping position opposite the lower retaining beam the workpiece to be bent is clamped, the upper holding cheek being offset horizontally in the feed direction in a second clamping position relative to the lower holding cheek clamps the workpiece to be bent, the lower bending cheek being set up in the first clamping position to hold the workpiece to be bent To bend the workpiece upwards around the front edge of the upper holding cheek, the upper bending cheek being set up in the second clamping position in order to bend the workpiece to be bent downwards around the front edge of the lower holding cheek.

STATE OF THE ART

From the EP-A-2 014 381 a sheet metal bending machine with a lower machine part and an upper machine part is known, which are arranged to be movable relative to one another in a feed direction of a workpiece to be bent. A lower holding beam and a lower bending beam are assigned to the lower machine part and an upper holding beam and an upper bending beam are assigned to the upper machine part. These four cheeks are aligned transversely to said feed direction and the workpiece to be bent can be inserted between them. In a first clamping position, the upper holding cheek holds the workpiece to be bent opposite the lower holding cheek and clamps it. A bending beam can then be pivoted about an axis which pivots the sheet metal part to be bent. The bending machine after the EP-A-2 014 381 a bending tool on the upper beam and on the lower beam, which is then mounted in a mutually horizontally sliding connection, so that a second clamping position is specified, in which the upper retaining beam, offset horizontally in the feed direction relative to the lower retaining beam, clamps the workpiece to be bent. The holding and bending beams are arranged in such a way that in the first clamping position the lower bending beam is set up to move the workpiece to be bent around the front edge of the upper holding beam to bend up and in the second clamping position the upper bending beam is set up to bend the workpiece to be bent down around the front edge of the lower holding beam. In this way, the synergetic effect of two cheeks arranged next to one another can be used in a very simple manner in order to bend a sheet metal part to be processed in both directions in interesting cycle times.

the CN-A-104368641 describes a bending machine of the same type, the holding beam being adjustable relative to the lower holding beam in the feed direction, the upper machine part being pivotably mounted via a bolt on eccentric bushings which are fastened in the lower stand. By turning the eccentric, the upper machine part moves forwards or backwards and thus adjusts the cutting gap.

the WO-A-9732677 describes another device for bending a sheet metal with a device for holding the sheet metal, the holding device being provided with a mainly C-shaped frame with a lower and an upper disc. The legs of the C-shaped frame extend between the top and bottom beams of the frame so that the bottom and top panes abut the cheeks.

PRESENTATION OF THE INVENTION

Proceeding from this state of the art, the invention is based on the object of specifying a machine that is easier to operate, in which the opening between the lower and upper machine part can be adjusted more easily and, in addition, when bending a workpiece, such as sheet metal, into a double layer, a higher clamping force is achieved is reachable.

According to the invention, this object is achieved in that the upper machine part can be pivoted relative to the lower machine part about a first pivot axis aligned horizontally and transversely to the feed direction, and that the upper machine part can be pivoted relative to the lower machine part about a second pivot axis aligned horizontally and transversely to the feed direction that the two clamping positions are reached via a curved path deviating from the feed direction, with the first and the second pivot axis being arranged above the respective pivot point of the upper machine part.

A bending machine has a lower and an upper machine part, each with one Holding cheek and a bending cheek, which are arranged to be movable relative to one another in a feed direction of a workpiece to be bent. The four cheeks are aligned transversely to said feed direction and the workpiece to be bent can be inserted between them. The upper holding cheek then clamps the workpiece to be bent in two clamping positions that are shifted horizontally relative to one another in the feed direction relative to the lower holding cheek. In one clamping position, the upper bending beam bends the workpiece to be bent around the front edge of the lower bending beam down and in the other clamping position, the lower bending beam bends the workpiece to be bent around the front edge of the upper bending beam upwards. The upper machine part can be pivoted relative to the lower machine part about two pivot axes aligned horizontally and transversely to the feed direction, so that the two clamping positions are reached via a curved path that deviates from the feed direction and there is a third intermediate turning position for the workpiece.

The result is an advantageous third clamping position in which the first and second pivoting axes are pivoted in such a way that the upper retaining cheek and the lower retaining cheek are arranged at a smaller distance than the distance between the retaining cheeks in the first and second clamping position, in particular for a Envelope folding of the workpiece to be bent.

The aforesaid smaller distance from the clamping surface of the upper retaining cheek to the corresponding clamping surface of the lower retaining cheek can also correspond to the corresponding distance between the opposite surfaces of the bending cheeks. With conventional machines with a processing depth of more than one meter, this smaller distance can be one millimeter, i.e. with a distance between the clamping surfaces in the first and second clamping position of 2.5 millimeters, for example, then the distance between the clamping surfaces in the third position can only be be more than 1.5 millimeters.

The actuator of the upper machine part, which acts on the free end of the upper machine part opposite the cheeks, acts on the free end of a lever, the pivot axis being provided at the other free end, and being the upper machine part articulated between the two free ends on the lever.

The actuator of the upper machine part, which acts on an area of the upper machine part between the cheeks and the opposite free end of the upper machine part, then advantageously acts on an area of a further lever, the pivot axis being provided at a free end and the upper machine part is articulated at the other free end to the further lever. As a result, the curve movement for the articulation of the upper machine part, which is predetermined for the height of the third clamping position, is fixed in the middle.

The lower bending beam and the upper bending beam can have the same width of their clamping surface in the feed direction, which corresponds to half the horizontal distance in the feed direction of the pivoting movement of the upper machine part to reach the first and second clamping position.

The lower retaining cheek and the upper retaining cheek can have the same width of their clamping surface in the feed direction.

If the two features mentioned are present, said width of the clamping surface of the holding cheeks can correspond to said horizontal distance in the feed direction of the pivoting movement of the upper machine part. Then, when clamping, at least 40 to 50% of the retaining cheeks are always activated for the clamping.

On at least one outside of one of the bending beams, a tapering of the corresponding bending beam can be provided, the length of the clamping surface of the bending beam of which corresponds to said horizontal distance in the feed direction of the pivoting movement of the upper machine part. The length of the tapered section from the tip of the edge to the thickening is chosen so that the underside of the upper bending beam can be bent completely around the edge and then rest on this tapered section. The narrowing, with its length of the clamping surface of the bending beam in the feed direction, allows the upper bending beam to be pivoted over a larger angular range, so that sections which have already been bent curved profiles can occupy an even larger free space

Further embodiments are specified in the dependent claims.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1

eine perspektivische Ansicht eines Biegemaschine;

Fig. 2

eine schematische Seitenansicht der Biegemaschine nach Fig. 1 in der ersten Klemmposition;

Fig. 3

eine schematische Seitenansicht der Biegemaschine nach Fig. 1 in der zweiten Klemmposition;

Fig. 4

eine stark vergrösserte schematische Seitenansicht des Wangenbereichs der Fig. 2;

Fig. 5

eine stark vergrösserte schematische Seitenansicht des Wangenbereichs der Fig. 3;

Fig. 6

eine stark vergrösserte schematische Seitenansicht des Wangenbereichs beim Übergang zwischen der ersten und zweiten Klemmposition;

Fig. 7

eine vergrösserte schematische Seitenansicht des Wangenbereichs beim Biegen mit der unteren Biegewange; und

Fig. 8

eine vergrösserte schematische Seitenansicht des Wangenbereichs beim Biegen mit der oberen Biegewange.

Preferred embodiments of the invention are described below with reference to the drawings, which are for explanation only and are not to be interpreted as restrictive. In the drawings show:

1

a perspective view of a bending machine;

2

a schematic side view of the bending machine 1 in the first clamping position;

3

a schematic side view of the bending machine 1 in the second clamping position;

4

a greatly enlarged schematic side view of the cheek area 2 ;

figure 5

a greatly enlarged schematic side view of the cheek area 3 ;

6

a greatly enlarged schematic side view of the cheek area during the transition between the first and second clamping position;

7

an enlarged schematic side view of the cheek area during bending with the lower bending cheek; and

8

an enlarged schematic side view of the cheek area during bending with the upper bending cheek.

DESCRIPTION OF PREFERRED EMBODIMENTS

the 1 shows a perspective view of a bending machine 1, more precisely a section of a bending machine 10, wherein the lower part 20 is mounted with feet 24 on a floor. The lower part 20 is essentially flat and forms a C. A bending machine 10 has at least two such sections 20, each with one the upper part 30 hinged to the lower part 20. The sections are connected inter alia via the horizontal shaft 92' of the upper pivot point and the horizontal shaft 44 of a lower pivot point for the cheek actuation. In addition, the cheeks described below extend beyond adjacent sections.

Each section of the bending machine 10 has said base 20 which is fixed to the floor or stands on it. At said base 20, the upper part 30 is articulated, from which in the 1 only one rear panel is shown. A first drive 95 is attached to the lower part 20 in the rear region, with which the ram 21 can be moved forward essentially in the horizontal direction. The plunger 21 is articulated at a free end of a substantially vertically aligned lever 22 which is pivotably connected to the lower part 20 at the articulation sleeve 91 ′ in the region of its opposite free end. The lever 22 consists of two parallel plates connected to one another, at the lower end of which the pivot axis 23 engages around the plunger 21 in a pivotable manner from both sides.

The rear panel of the upper part 30 is graphically in the 1 arranged behind the rear panel 22, a front panel, not shown here, of the upper part 30 is arranged in front of the front panel 22. The distance between the two plates of the upper part 30 is ensured by a spacer sleeve 33, among other things. At the same time, the two plates of the upper part 30 engage around the articulation sleeve 93' on the lever 22, to which they are pivotably attached. With a forward movement of the ram 21, the upper part 30 is thus also pivoted about the axis of rotation located in the articulation sleeve 91'.

At the opposite free end of the lever 22, a second drive 96 is articulated, whose plunger 31 extends forward and acts on the further lever 32. The lower end of the further lever 32 is connected to the articulation sleeve 94'. The Indian 1 The parts of the articulation sleeve 94' that are not visible are connected to the visible rear panel of the upper part 30, while the visible part is articulated to the front panel of the upper part 30 (not shown here) in the same plane as the articulation sleeve 93'. The opposite upper end of the further lever 32 engages in the horizontal shaft 92 ′ of the upper pivot point, which is held by a lateral receptacle in the end region of the base 20 . These items, as well following description, read in the same way on the two following drawings.

the 2 12 shows a schematic side view of the bending machine 10 according to FIG 1 with the retaining cheeks 50, 60 in a first clamping position; and the 3 12 shows a schematic side view of the same bending machine 10. FIG 1 with the retaining cheeks in the second clamping position, which is enlarged in the 4 or. figure 5 are shown as the first clamping position 110 and the second clamping position 120, respectively. The two end positions of the movement of the cheeks are reached by actuating the actuators 95 and 96, which influence the arrangement of the cheeks. The lower clamping cheek 50 remains in place. The reference numerals 97' and 98' designate the articulation points of the lower and upper bending beam drives, respectively. Only the actuator of the lower bending beam drive 97 is in the 3 drawn. The actuator of the upper bending beam drive is attached to the upper part 30 in the same way.

The bending machine 10 has a lower clamping cheek 50 and an upper clamping cheek 60, which are each attached to the lower part 20 and the upper part 30, respectively. With the reference numeral 100, the feed direction for a workpiece is indicated, which in the figs 2 to 5 drawn between the cheeks from the left. The lower bending beam 70 is arranged in front of the lower beam 50, counter to the feed direction 100, and the upper bending beam 80 is correspondingly arranged in front of the upper beam 60, the corresponding clamping positions according to FIG 2 and 3 in the detailed drawings figs 4 and 5, respectively. The plunger 21 is arranged between the two parallel flat lever surfaces of the lever 22, which allows a simpler central transmission of the forces. Likewise, the drive 96 is positioned centrally between the plates of the lever 22 and those of the lever 32. FIG.

In the representation of 2 it can be seen that the reference numeral 90 denotes the vertical below the first pivot point 91 and below the second pivot point 92 . In other words, in the first clamping position 110, which is in the 2 is shown, the pivot point 93 of the rear lever 22 is to the left of the vertical in the drawing, as is the pivot point 94 of the front lever to the left of the vertical 90 in the central area of the upper part 30 located. The upper part 30 is thus shifted to the left in relation to the lower part 20 overall against the feed direction 100 , which manifests itself in the fact that the upper bending beam 80 protrudes over the lower bending beam 70 . This is then better detailed in the 4 to recognize. The lower clamping surface 52 of the lower retaining cheek 50 lies parallel to the upper clamping surface 62 of the upper retaining cheek 60. In the insertion direction 100 of a metal sheet, the upper or lower retaining cheek 60 or 50 is twice as long as the length of the upper or lower bending cheek 80 or 70. In this respect, the upper clamping surface 62 of the upper holding cheek 60 is arranged opposite a part of the surface 52 of the lower holding cheek 50 and opposite the lower clamping surface 72 of the lower bending cheek 70. In other words, the upper bending beam 80 protrudes with its entire upper clamping surface 82 over the front edge 71 of the lower bending beam 70 . When the upper bending beam 80 is rotated about the front edge 71 of the lower bending beam 70, a metal sheet placed in the bending machine 10 is bent downwards. So that this function can be exercised in this way, there is a distance 99 between the lower bending surfaces 52 and 72 and the upper bending surface 62 of somewhat less than the thickness of a sheet metal to be inserted as a workpiece. The distance 99 symbolized by the arrows pointing at one another is 1 mm, for example, in the case of a metal sheet with a diameter of 1.5 mm. A sufficient clamping force is thereby generated between the metal sheets 62 on the one hand and 52 and 72 on the other hand.

The tapered outer surface of the lower bending beam 70 is designated by the reference number 74 . The length of the tapered portion 74 from the tip of the edge 71 to the thickening is chosen so that, as in FIG 8 it can be seen that the underside 82 of the upper bending beam 80 can be bent completely around the edge 71 and then rest on this tapered section 74 . The taper 74, with its length of the clamping surface 72 of the bending beam 70 in the feed direction 100, allows the upper bending beam 80 to be pivoted over a larger angular range, so that sections of curved profiles that have already been bent can occupy an even greater free space.

The second defined clamping position of the bending machine 10 is in the figure 5 shown. The lower part 20 and thus the lower retaining cheek 50 have remained in the same place. The same applies to the lower bending beam 70, which with its sloping inner surface 73 touches the complementary sloping outer surface of the holding beam 50 connects. From the first clamping position 110 of 4 then the upper part 30 with the upper holding beam 60 connected to it and the upper bending beam 80 moves back by twice the length of the holding surface 82 or 72 of a bending beam 80 or 70, so that the front edge 81 of the upper bending beam 80 is now opposite the lower edge 51 of the lower one Retaining cheek 50 comes to rest, so that the lower bending cheek 70 can bend any metal sheet inserted around this lower edge 81 .

The movement of 4 to figure 5 is achieved by the pivoting movement of the upper part 30, in particular the part of the upper part 30 located at the pivot point 93 on the rear lever 22 being pivoted backwards, passing a low point in the vertical direction, when the perpendicular 90 is passed. The middle part at the front of the upper part 30 is pivoted backwards in the same way via the perpendicular 90 by a downwardly evasive pivoting movement. For this, the actuators 95 and 96 are moved in the following manner. By retracting the plunger 21, the rear suspension 93 moves from the in the 2 shown position left of the vertical 90 in the position 93 of 3 , which is arranged in the drawing to the right of the vertical, with the lower attachment point of the upper part 30 being pivoted out to the rear. Simultaneously moves the pivot 94, which is in the 2 has been arranged left of the axis 90, in the position of 3 , at which this pivot point 94 comes to lie to the right of the axis 90. The mechanism connected to the control of the bending beams 60 and 80 is not described in detail here, but can be designed as in the prior art. The actuator 97 is a lower bending beam drive for the control parallelogram 75. The only essential thing is that the lower bending beam 70 can be guided around the front edge 81 of the upper bending beam 80 and that the upper bending beam 80 can be guided around the front edge 71 of the lower bending beam 70.

the 6 shows the front clamping area with the four cheeks 50, 60, 70, 80, which are arranged directly opposite one another in a third position, in which the lower clamping surface 52 is directly opposite the upper clamping surface 62 and the lower clamping surface 72 is exactly opposite the upper clamping surface 82 are arranged. Thus the front edges 71 and 81 of the lower bending cheeks 70 and 80 are opposite each other in this position. In order to get to this third position 130, the actuators 95 and 96 in motion have brought the rotating sleeves 93 and 94 approximately into the vertical position, which means nothing other than that they are arranged lower than the end positions of the trajectories. Since the rotary sleeves 93 and 94 are then in their lowest position, the upper part 30 suspended from them is also in its lowest position. It is then possible to clamp metal sheets very easily onto one another as workpieces, i.e. to produce an envelope, since there is then a smaller distance 99 between the surfaces 52 and 62 or 72 and 82, for example by 0.5 to 2 millimeters, in particular by 1 millimeter, reduced distance.

the 7 shows an enlarged schematic side view of the cheek area during bending with the lower bending cheek 70, with the upper holding cheek 60 and upper bending cheek 80 being in contact with one another, namely that the upper bending cheek 80, which has its sloping inner surface 83 on the complementary sloping outer surface of the upper retaining cheek 60 connects. The lower clamping surface 62 and the upper clamping surface 82 form an aligned line with one another.

A parallelogram mechanism 75 , which is actuated by a corresponding actuator 97 , is provided for moving the lower bending beam 70 . These elements are fastened directly to the base 20, which insofar remains stationary. In other exemplary embodiments, the parallelogram mechanism 75 can be replaced by another known bending beam movement device.

the 8 finally shows an enlarged schematic side view of the cheek area during bending with the upper bending cheek 80 7 what is said applies here as well. The parallelogram mechanism 85 is actuated by the actuator 98 as the upper bending beam drive and, in other exemplary embodiments, it can be replaced by another known bending beam moving device. REFERENCE LIST 10 bending machine 75 parallelogram 20 lower part 80 upper bending beam 21 ram 81 Front edge of the upper bending beam 22 lever 23 pivot axis 82 upper clamping surface 24 section foot 83 Inner surface 30 back top 85 parallelogram 31 ram 90 vertical 32 lever 91 first pivot point 33 spacer sleeve 91' pivot sleeve 40 Vacuum gripper and stop 92 second pivot point 41 front section 92' pivot horizontal shaft 42 clamping cheek carrier 44 pivot horizontal shaft 93 Pivot point rear lever 93' pivot sleeve 50 lower retaining cheek 94 Pivot point front lever 61 Front edge of the upper retaining cheek 94' pivot sleeve 95 first drive 52 lower clamping surface 96 second drive 60 upper retaining cheek 97 lower bending beam drive 61 Front edge of the upper retaining cheek 97' Pivot point lower bending beam drive 62 upper clamping surface 98' Pivot point of the upper bending beam drive 70 lower bending beam 71 Front edge of the lower bending beam 100 feeding direction 110 first clamping position 72 lower clamping surface 120 second clamping position 73 Inner surface 130 third position 74 outer surface

Claims (9)

1. Bending machine (10) with a lower machine part (20) and an upper machine part (30), which are arranged movably relative to one another in a feed direction (100) of a workpiece to be bent, with a lower holding beam (50) and with a lower bending beam (70), which are associated with the lower machine part (20), with an upper holding beam (60) and with an upper bending beam (80), which are associated with the upper machine part (30), wherein the four beams (50, 60, 70, 80) being aligned transversely to the said feed direction (100) and the workpiece to be bent being insertable between the said four beams between the machine parts (20, 30), the upper holding beam (60) clamping the workpiece to be bent in a first clamping position (110) with respect to the lower holding beam (50), the upper holding beam (60) clamping the workpiece to be bent in a second clamping position (120) with respect to the lower holding beam (50) horizontally offset in the feed direction (100), wherein in the first clamping position (110) the upper bending beam (80) is arranged to bend the workpiece to be bent downwards about the front edge (71) of the lower bending beam (70), wherein in the second clamping position (120) the lower bending beam (70) is arranged to bend the workpiece to be bent upwards about the front edge (81) of the upper bending beam (80), characterised in that in that the upper machine part (30) can be pivoted with respect to the lower machine part (20) about a first pivot axis (91) aligned horizontally and transversely with respect to the feed direction (100), and in that the upper machine part (30) can be pivoted with respect to the lower machine part (20) about a second pivot axis (92) aligned horizontally and transversely with respect to the feed direction (100), so that the two clamping positions (110, 120) are reached via a curved path deviating from the feed direction (100), wherein the first (91) and the second (92) pivot axis is arranged above the respective articulation point (93 and 94) of the upper machine part (30).
2. Bending machine (10) according to claim 1, comprising a third clamping position (130), in which the first (91) and the second (92) pivot axes are pivoted in such a way that the upper holding beam (70) and the lower holding beam (50) are arranged at a smaller distance than the distance (99) between the holding beams (50, 70) in the first (110) and second (120) clamping position, respectively, in particular for a fold-over folding.
3. Bending machine (10) according to claim 2, that said smaller distance from the clamping surface (72) of the upper holding beam (70) to the corresponding clamping surface (52) of the lower holding beam (50) also corresponds to the corresponding distance of the opposite surfaces (62, 82) of the bending beams (60, 80).
4. Bending machine (10) according to any one of claims 1 to 3, wherein the actuator (95) of the upper part (30) acting on the free end of the upper machine part (30) opposite to the beams (60, 80) acts on the free end of a lever (22), the pivot axis (91) being provided at the other free end (91), and the upper machine part (30) being hinged to the lever (22) between the two free ends.
5. Bending machine (10) according to any one of claims 1 to 4, wherein the actuator (96) of the upper machine part (30) acting on a portion of the upper machine part (30) between the beams (60, 80) and the opposite free end of the upper machine part (30) acts on a portion of a further lever (32), the pivot axis (92) being provided at one free end and the upper machine part (30) being pivoted at the other free end to the further lever (32).
6. Bending machine (10) according to any one of claims 1 to 5, wherein the lower bending beam (70) and the upper bending beam (80) have an equal width of their clamping surface (72 and 82, respectively) in the feed direction (100), corresponding to half the horizontal distance in the feed direction (100) of the pivoting movement of the upper machine part (30) to reach the first (110) and the second (120) clamping positions.
7. Bending machine (10) according to any one of claims 1 to 6, wherein the lower support beam (50) and the upper support beam (60) have an equal width of their clamping surface (52 and 62, respectively) in the feeding direction (100).
8. Bending machine (10) according to claim 6 and according to claim 7, wherein said width of the clamping surface (52, 62) of the holding beams (50, 60) corresponds to said horizontal distance in the feeding direction (100) of the pivoting movement of the upper machine part (30).
9. Bending machine (10) according to one of the claims 6 or 8, wherein on at least one outer side (74) of one of the bending beams (70, 80) a taper of the corresponding bending beam (70, 80) is provided, the length of which corresponds to the length of the clamping surface (72, 82) of the bending beam (70, 80) in the feed direction (100).

Images