EP2210681B1 - Bending press with a multi-part press bar - Google Patents

Description

The invention relates to a bending press as described in the preamble of claim 1.

The document DE 32 45 755 A1 discloses a bending press, in particular a press brake, or a method for correcting the bending line of a bending tool. Here, the lower tool of the bending press is divided into two mold halves. These two tool halves of the lower tool each have independently adjustable tool segments, each tool segment is assigned its own servo motor, whereby the individual tool segments are independently adjustable transversely to the bending direction. As a result, the distances of the bending gap, seen across the width of the bending press, freely and independently set. Furthermore, a plurality of measuring sensors are arranged in the upper tool and / or in the lower tool, which measure the bending line or the deflection of the bending tool in the course of the bending process. In a bending process according to D1, the bending line of the upper tool and / or lower tool is measured in the vertical plane by means of one or more encoders during the bending process. Subsequently, the individual segments of the mold halves of the lower tool are adjusted analogously to the determined measured values in order to adapt the distances of the bending gap across the width of the bending press to such an extent that a bending of the bending line is achieved in accordance with the specifications.

The EP 0 550 042 A1 discloses a press brake with the features of the preamble of claim 1, which has a displaceable pressing beam with a plurality of adjustment units arranged thereon. The adjusting units each have a first electric motor, which is designed for the load-free adjustment of the press beam, and a second electric motor, which is designed for the bending adjustment of the press beam.

The DE 17 77 088 A1 discloses a hydraulic press for material to be pressed, in particular for bulk material, which is pressed using a high pressure and using high temperature to a plate. Here, the crop is between two work surfaces, with an upper work surface in a movable Pressbär and a lower work surface stored in a fixed press table. The movable Pressbär is moved by the master cylinder up or down. Columns connect to the bottom press table, which allows the columns to transmit power between these two parts. Both in the overhead and movable Pressbär sitting in the lower press table and compensating, which act centrally on the recorded in Pressbär, or in the press table worktops to deform this can. Due to the compensation piston, the curvature or the force distribution in the work surfaces can be changed. As a result, it is possible to distribute an approximately equal force to the pressed material lying between the working surfaces over the entire surface of the pressed material, as a result of which the finished pressed plates have an approximately constant thickness. Compared to plate presses without compensation piston thus the compressive force induced deformation of the work surfaces can be compensated.

From the document EP 0 543 772 A1 is a press with a vertical, relative to a fixed lower beam, movable upper beam known. The upper beam is approximately two-part perpendicular to a force acting direction, wherein the two cheek parts abut each other in the cheek center and are separated on either side of the joint by a gap with up to the cheeks ends ever increasing gap width. By this subdivision of the upper beam can be achieved that bend the upper beam and the lower beam under load at the workplace in the same direction and the deflection lines are at least approximately parallel. The two cheek parts of the upper cheek are preferably connected to each other by coupling members at their outer end regions, said coupling members connected via hinge axes with the cheek parts and spring elements, whereby in the unloaded state of the bending tool receiving cheek part assumes a stable, neutral position.

The object of the invention is to provide a bending press with a transverse to the bending force press bar with the reduction of the cycle time is achieved for a forming process, higher Verstellgeschwindigkeiten can be achieved, and thus a reduction of the total cycle time is achieved.

This object of the invention is achieved by the reproduced in claim 1 features. The surprising advantage is that in a forming cycle to be moved mass of the tool bar in a bending forces receiving, a relatively small stroke to be undertaken main mass and the Hauptverstellweg vorzunehmende, the bending tool having secondary mass is divided and thus greater Verstellgeschwindigkeiten for the express ways of the press bar while maintaining the safety requirements are achieved and also by the further drive assembly for the adjustment of the secondary mass relative to the main mass, with a larger number of adjusting means, a form adaptable to a deflection of the fixed table beam support surface of the adjustable tool bar is achieved.

By the advantageous embodiments described in claims 2 and 3 components are saved and achieved a modular structure, whereby the assembly cost is reduced.

But also advantageous is an embodiment according to claim 4, whereby elaborately designed pressure piston can be avoided.

The advantageous development described in claim 5 ensures the need-based reversible movement for the relative adjustment between the multi-part baler bar.

By the advantageous embodiments described in claims 6 to 8 a structurally very simple and effective clamping device for the actuating means of the drive assembly for the tool bar is achieved.

Advantageous in this case is also an embodiment according to claim 9, whereby a clamping device with secure clamping effect is achieved even at higher restoring forces and, above all, an effective prevention of safety endangering caster in the event of an emergency stop.

Due to the advantageous embodiment described in claim 10 an exact, tilt-free guidance of the tool bar is achieved against the press bar at its relative displacement.

The advantageous developments described in claims 11-14 ensure a low mass of the tool bar, whereby a high adjustment speed is achieved with a low drive power and thus with low energy consumption for the drive assembly us further the necessary adjusting means are small dimensioned.

For a better understanding of the invention, this will be explained in more detail with reference to the embodiments shown in FIGS.

Fig. 1

die erfindungsgemäße Biegepresse mit mehrteiligen Pressenbalken in Ansicht;

Fig. 2

die erfindungsgemäße Biegepresse in Draufsicht;

Fig. 3

eine Detailansicht der erfindungsgemäßen Biegepresse mit dem und einem Werkzeugbalken in deren oberen Endlagen;

Fig. 4

die Detailansicht mit dem Pressenbalken in oberer und dem Werkzeugbalken in unterer Endlage;

Fig. 5

die Detailansicht mit dem Pressenbalken in unterer Endlage unter Aufbringung einer Umformkraft auf einen Werkteil;

Fig. 6

eine Detaildarstellung einer Antriebsanordnung zur Relativverstellung des Werkzeugbalkens gegenüber dem Pressenbalken;

Fig. 7

eine perspektivische Darstellung eines Maschinengestells der erfindungsgemäßen Biegepresse.

Show it:

Fig. 1

the bending press according to the invention with multi-part baler bar in view;

Fig. 2

the bending press according to the invention in plan view;

Fig. 3

a detailed view of the bending press according to the invention with the and a tool bar in the upper end positions thereof;

Fig. 4

the detail view with the press bar in the upper and the tool bar in the lower end position;

Fig. 5

the detail view with the press bar in the lower end position under application of a forming force on a workpiece;

Fig. 6

a detailed view of a drive assembly for relative displacement of the tool bar relative to the press bar;

Fig. 7

a perspective view of a machine frame of the bending press according to the invention.

In the Fig. 1 and 2 a bending press 1 is shown. On bottom plates 2, for bearing the bending press 1 on a footprint 3, are in alignment with a bending plane 4 at a distance corresponding to a predetermined length 6 of a fixed table beam 7 in the direction perpendicular to a top 8 of the bottom plate 2 opposite each other a side stand. 9 , 10 attached. The side posts 9, 10 are formed of solid plate blanks in C-shape with base legs 11 facing each other, with vertically projecting end faces 12 in the distance 5 and corresponding to the length 6 of the table beam 7. The side stand 9, 10 and the table bar 7 are connected to each other connected, for example screwed or welded. A width 13 of the base legs is greater than a width 14 of vertically rising webs 15 of the side stand 9, 10 to which in the vertical direction then head legs 16 of the side stand 9, 10 are formed, which have approximately the width 13 of the base legs 11 and Assign each other with end faces 17. By the C-shaped design of the side stand 9, 10 with the one smaller width 14 having webs 15 is a free space on both sides of the table beam 7 created as a manipulation space for the operation of the bending press 1 for a tool or workpiece change.

The mutually facing head legs 16 of the side stand 9, 10 are provided with the upper side 8 in vertical alignment extending guideways 18 a guide assembly 19 in which a press bar 20 - according to double arrow 21 - is adjustably mounted, with drive means 22 of a drive assembly 23, which also attached to the head legs 16, drivingly connected.

In the exemplary embodiment shown, the drive means 22 are formed by double-acting tandem pressure cylinder, which with a pressure medium from an oil hydraulic supply device not shown and associated control and regulating device for a reversible movement - according to double arrow 21 - acted upon.

The adjustable over the drive assembly 23 relative to the table bar 7 press bar 20 stores telescopically adjustable a tool bar 25 which is reversibly adjustable by a further drive assembly 26 in the adjustment of the press bar 20 relative to this.

On mutually facing support surfaces 27 of the table beam 7 and the tool bar 25 are preferably over the entire length 6 of the table beam 7 and tool bar 25 tool holders 28 for the assembly with bending tools 29, 30th

The tool bar 25 is guided along a linear further guide arrangement 31, which is preferably integrated in the press bar 20. The drive arrangement 26 for the tool bar 25 is formed by a plurality of likewise arranged in the press bar 20 arranged adjusting means 32 which is formed by one side acted upon by a pressure medium, in bores 33 of the press bar 20 adjustable pressure piston 34 is formed.

The arrangement or alignment of the adjusting means 32 in the press bar 20 allows adjustment of the tool bar 25 relative to the press bar 20 in alternate adjustment, according to - double arrow 35th

This design of the drive assemblies 23, 26 allows on the one hand a common adjustment of the press bar 20 with the tool bar 25 and the adjustment of the tool bar 25 relative to the press bar 20 in reversible directions.

As described in detail later, the adjusting means 32 have controllable clamping devices 36 for the pressure pistons 34, as a result of which the relative position of the tool bar 25 to the press beam 20 can be fixed as required. In addition, this allows, as also described later, the tool bar 25, which is preferably carried out in lightweight construction, by different adjustment and positional fixation of the pressure piston 34 by means of the clamping means 36, to compensate for a expected by the forming process of a workpiece deflection, in opposite Bending direction and thus avoid forming errors on the workpiece.

The lightweight construction of the tool bar 25 is achieved by weight-reducing measures, for example by the shown lattice-like design of the tool bar 25, whereby the mass to be moved is minimized. This allows an increase in the adjustment speed and thus a reduction of the cycle time for a forming process. On the other hand, the lightweight construction allows reduced drive power, i. smaller drive components and the execution of the previously described crowning measures.

In the Fig. 3 to 5 is now shown in detail the formation of the press bar 20, tool bar 25 and the drive assembly 26 with the adjusting means 32 and below the intended operation of the bending press 1 according to the invention with the press bar 20 and the tool bar 25 is adjustable relative thereto explained.

A working cycle of the bending press 1 according to the invention with the multi-part press beam 20 comprises the movement starting from an upper end position - level 40 - with retracted drive means 22 of the drive assembly 23 for the application up to a, according to the design of the bending press 1, maximum provided forming force.

In this initial position of the tool bar 25, for example via at least one positioning means 32 oriented as Hubstellmittel 41 positioned in a remote from the table bar 7 level 42. Thus, a sufficient clearance is given by a corresponding distance 43 between the bending tools 29, 30. Further arranged as a pressure adjusting means 44 in the press bar 20 arranged adjusting means 32 are not pressurized and in a retracted end position by the force of the force acting on the pressure medium Hubstellmittels 41st

Starting from this upper end position of the press bar 20, the cycle cycle now provides an express delivery for the approach of the bending tools 29, 30 to a predetermined safety distance 45 between the bending tools 29, 30, taking into account a thickness 46, a for a forming operation on the other bending tool 30 placed workpiece 47th , in front. The safety distance 45 is provided in accordance with the safety guidelines to prevent injuries, up to reaching the safety distance 45, a higher adjustment against an adjustment for the approach of the bending tool 29 to the workpiece 47 and for the actual forming process is allowed.

This Eilzustellung takes place at existing upper end position - according to level 40 - by a relative adjustment of the tool bar 25 as indicated by arrow 48, that is without adjustment of the drive means 22 of the drive assembly 23. This express delivery of the tool bar 25 - according to arrow 48 - on a lower level 49 occurs preferably by gravity due to venting of Hubstellmittels 41 and optionally controlled counter pressure of the pressure adjusting means 44, or by activation of the clamping device 36 of the pressure piston 34 whereby a speed control or Verstellwegbegrenzung is achieved.

This express delivery of the tool bar 25, which, as already described above, by weight-saving measures, a low mass, can be done at high speed and thus time-saving and requires for their control only small volume flows of the drive assembly

The further cycle sequence is now in the Fig. 5 shown actual forming process of the workpiece 47 between the bending tools 29, 30 with previous clamping of Pressure piston 34, by activation of the clamping device 36 and pressurizing the drive means 22 of the drive assembly 23, whereby the required forming force, according to - arrow 50 - is applied to the press bar 20, depending on the forming process and the workpiece a lower end position of the press bar 20, depending is reached by an immersion depth of the bending tools 29, 30.

Thereafter, a reversal of the drive means 22 of the drive assembly 23 and the plunger cylinder 34 for opposite adjustment of the tool bar 25 - according to arrow 51 - by pressurizing the Hubstellmittels 41 and depressurization of the pressure actuating means 44. What the initial state, as in Fig. 3 is shown is reached, and thus the work cycle is completed.

How still the Fig. 5 can be seen, the multi-part design of the press bar 20 in conjunction with the pressure adjusting means 44 with integrated clamping device 36 for the pressure piston 34 allows a bending compensation of the bending process during bending press bar 20 characterized in that the pressure actuating means 44 according to a specification of the adjustment paths, for example, depending on Workpiece and / or machine parameters differentiated for the individual pressure actuating means 44 are determined, adjusted and fixed by means of the clamping device 36, and thus the deflection of the press bar 20 is compensated. Also, thereby occurring bending of the table beam 7, as shown in exaggerated form, are compensated and thus a high forming quality can be achieved within narrow tolerances.

In the Fig. 6 For example, an embodiment of the actuating means 32 with the clamping device 36 is shown.

In a blind bore 52 of the press bar 20 for a relative adjustment - according to double arrow 35 - of the tool bar 25 of the formed by a round rod 53 pressure piston 34 adjustable according to - double arrow 54 - arranged. The blind bore 52 forms a pressure chamber 55 which is connected via a line 56 with a supply device not shown in - double arrow 57 -, via which a pressure supply of the pressure chamber 55 with the pressure medium or for the discharge of the pressure medium takes place.

The pressure piston 34 is arranged pressure-tight in the blind bore 52 via a sealing device not shown opposite the pressure chamber 55 and further penetrates a receiving area 58 for the clamping device 36 with respect to a diameter of the blind bore 52 enlarged diameter, whereby a via a line 59, if necessary, with a Pressure medium - according to double arrow 60 - to be supplied, annular gap space 61 is reached in the pressure-tight, an elastic tubular pressure cuff 62 is arranged. This comprises a pressure piston 34 surrounding, resilient, slotted clamping sleeve 63 which is pressed at a pressurization of the gap 61 as a locking means 64 by the pressure cuff 62 to an outer surface 65 of the plunger 34 and thus the relative displacement of the tool bar 25 against the press beam 20th is prevented as needed.

How further the Fig. 6 and already in the description of the Fig. 1 contained in the press bar 20 more adjusting means 32 in its direction of adjustment in the opposite direction oriented pressure piston 34 is provided whereby a relative movement of the tool bar 25 according to - double arrow 35 - by controlling the respective pressure chambers 55 and the adjustment limited as needed by appropriate control of the locking means 64 and the position taken can be fixed.

In the Fig. 7 a possible embodiment of a machine frame 66 of the bending press 1 according to the invention is shown.

This consists essentially of the C-shaped side uprights 9, 10 as already described above with the base legs 11 and the head legs 16 facing one another. These are distanced from one another via the webs 15 in vertical direction to the contact area 3. Between the mutually facing end faces 12 of the base legs 11 of the table bar 7 is arranged, which forms the support surface 26 for a tool holder not shown.

At the mutually facing end faces 17 of the head legs 16 of the side stand 9, 10, the drive means 22 of the drive assembly for the press bar not shown are in the embodiment shown directly attached.

It should be noted at this point that the drive arrangement for the press beam can be designed for hydraulic operation of the press brake 1 as described by hydraulic single cylinders, tandem cylinders, which can be acted upon by a pressure medium.

To provide a strain-resistant machine frame 66 in the form of an O-machine frame, as shown, for example, the mutually facing head legs 16 may be connected via connecting profiles 67, which form a crosshead 68.

Furthermore, the figure in the legs 15 arranged and these transverse apertures 69 can be seen, the placement of the bending press 1 with the bending tools or with tool sets in alignment with the bending plane 4, according to - double arrow 70 -, for example, a close range of the Machine frame 66 arranged tool storage, preferably with an automated tool changer allow.

Coming back to the previously described Fig. 1 and 7 However, it should also be pointed out further that the described bending press 1 according to the invention with the press beam 20 and tool bar 25 is also possible in a design in which the crosshead 67 forms the stationary table beam 7 with the tool holder 28 facing the contact surface 3.

The press beam 20 and the tool bar 25 are operated according to this embodiment in the reverse direction of action via the drive assemblies 23, 26, i. a forming process takes place on a workpiece 47 positioned between the bending tools 29, 30 by lifting the press bar 20 relative to the machine frame 66, and the force of gravity comes into effect during the rapid return stroke.

The embodiments show possible embodiments of the bending press according to the invention, which should be noted at this point that the invention is not limited to the specifically illustrated embodiments thereof, but also various combinations of the individual embodiments are possible with each other and this possibility of variation due to the teaching of technical action representational

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 the sake of order, it should finally be pointed out that in order to better understand the structure of the bending press, these or their components have been shown partially unevenly and / or enlarged and / or reduced in size.

The task underlying the independent inventive solutions can be taken from the description. <B> Reference Numbers </ b> 1 bending press 41 Hubstellmittel 2 baseplate 42 level 3 footprint 43 distance 4 bending plane 44 Pressure setting means 5 45 safety distance 6 length 46 thickness 7 bench beam 47 work part 8th top 48 arrow 9 kickstand 49 level 10 kickstand 50 arrow 11 base leg 51 arrow 12 face 52 blind hole 13 width 53 round bar 14 width 54 double arrow 15 web 55 pressure chamber 16 head leg 56 management 17 face 57 double arrow 18 guideway 58 reception area 19 guide assembly 59 management 20 press beams 60 double arrow 21 double arrow 61 gap 22 drive means 62 pressure cuff 23 drive arrangement 63 clamping sleeve 24 64 Locking means 25 tool bar 65 surface 26 drive arrangement 66 machine frame 27 support surface 67 crosshead 28 tool holder 68 connection profile 29 bending tool 69 breakthrough 30 another bending tool 70 double arrow 31 further guidance arrangement 32 actuating means 33 drilling 34 pressure piston 35 double arrow 36 clamper 37 38 39 40 level

Claims (14)

1. A bending press (1), in particular an edging press, with a machine frame (66) with a fixed table bar (7), able to be equipped with bending tools (29, 30), and a press bar (20) movable by a drive arrangement (23) in a plane perpendicular to a supporting surface (27) for the bending tools (29, 30) of the table bar (7) in a guide arrangement (19) of the machine frame (66) relative to the fixed table bar (7), wherein the press bar (20) supports a tool bar (25), able to be equipped with the bending tools (29, 30), movably in a displacement direction parallel to a displacement direction of the press bar (20), in a further guide arrangement (31), and between the press bar (20) and the tool bar (25) a plurality of adjusting means (32) of a further drive arrangement (26) are arranged, spaced apart from one another in the direction of the longitudinal extent of the press bar (20), aligned parallel to one another in the direction of action of force to the displacement direction of the press bar (20), characterized in that the adjusting means (32) are formed by pressure pistons (34), displaceable in bores (33) of the press bar (20), able to be acted upon on one side by a pressure medium from a supply facility, wherein a clamping arrangement (36) for the pressure piston (34), arranged in the bore (33), is associated with each adjusting means (32).
2. The bending press (1) according to one of the preceding claims, characterized in that the adjusting means (32) are arranged in an integrated manner in the press bar (20).
3. The bending press (1) according to one of the preceding claims, characterized in that the adjusting means (32) are arranged in an integrated manner in the tool bar (25).
4. The bending press (1) according to one of the preceding claims, characterized in that the adjusting means (32) are formed by round rods (53), provided with a sealing means, delimiting a pressure chamber (55) for the pressure medium in the bores (33).
5. The bending press (1) according to one of the preceding claims, characterized in that at least two adjusting means (32) are arranged for a direction of action of force oriented opposed to further adjusting means (32) in the press bar (20).
6. The bending press (1) according to one of the preceding claims, characterized in that the clamping arrangement (36) is arranged in a receiving region (58) surrounding the pressure piston (34) in an annular manner.
7. The bending press (1) according to claim 6, characterized in that an elastic, tubular pressure sleeve (62) is arranged in a bore forming the receiving region (58), which sleeve forms a pressure-tight gap (61) in the bore.
8. The bending press (1) according to claim 7, characterized in that between the pressure sleeve (62) and the pressure piston (34) a slotted clamping sleeve (63), surrounding the latter in an annular manner on a surface (65), is arranged.
9. The bending press (1) according to claim 8, characterized in that the clamping sleeve (63) has on a surface facing the surface (65) of the pressure piston (34) a wear-resistant layer increasing a coefficient of friction.
10. The bending press (1) according to one of the preceding claims, characterized in that the tool bar (25) is movably guided in a further guide arrangement (31) in the press bar (20).
11. The bending press (1) according to one of the preceding claims, characterized in that the tool bar (25) is formed at least in certain areas in a lightweight mode of construction, e.g. by a web framework.
12. The bending press (1) according to one of the preceding claims, characterized in that the tool bar (25) is formed from light metal.
13. The bending press (1) according to one of claims 1 to 12, characterized in that the tool bar (25) is formed from plastic, in particular from fibre-reinforced plastic.
14. The bending press (1) according to claim 1, characterized in that the machine frame (66) with the table bar (7), two lateral uprights (9, 10) and a crosshead (67) forms a deformation-resistant O-frame.

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