Machining machine, workpiece table and method for machining a workpiece

Description

[0001] The invention relates to a long bending machine and a method for machining a workpiece.

[0002] Various processing machines for machining workpieces made of flat material, such as sheet metal, are known in the art. Such processing machines can be used, for example, for forming and / or cutting. Examples include bending machines, presses, and punching machines.

[0003] So-called long bending machines are often used to produce profiles. These can be so-called swivel bending machines, which can bend a workpiece held between bending beams by controlled swiveling of a processing tool around a bending axis. Such machines are known, for example, from EP 2 014 381 B1 or DE 199 01 797 A1.

[0004] DE 10 2018 000344 B3 further discloses a bending machine with similarly constructed clamping jaws but a different bending mechanism. Linearly movable base elements are arranged on the clamping jaws. Bending tools, which are linearly movable relative to the base elements, are mounted on the base elements. By superimposing two linear movements, the bending tool's movement curves can be freely adjusted and precisely followed.

[0005] A generic long bending machine is known from EP 3 778 048 A1.

[0006] CN 110 303 077 B discloses a bending machine for bending pipes.

[0007] Depending on the target geometry of the workpiece being machined, it may be necessary to turn the workpiece during the machining process—that is, to rotate its bottom side up and its top side down. In many cases, this is done manually by the machine operator, which is time-consuming and can provoke operating errors.

[0008] In addition, various turning devices are known by means of which workpieces can be turned automatically. A first known turning device is designed as a separate machine arranged opposite a workpiece holder of a long bending machine. Such a turning device is used, for example, by the company Jorns, as can be seen in a video available at https: / / www.youtube.com / watch?v=0PcxtS-9smA. The long bending machine has a workpiece table that can be moved out between the bending beams from a receiving area within which the workpiece to be machined is arranged during bending. By moving the workpiece table out, the workpiece is moved towards the turning device. The workpiece is then completely in front of the clamping beams and can be picked up using the grippers of the turning device. The workpiece is then turned and placed back on the extended workpiece table.After turning, the previous top side is at the bottom and the previous bottom side is at the top. The workpiece table can then be retracted, placing the workpiece back in the receiving area for further processing.

[0009] Another well-known turning device is integrated into a long-form bending machine. Grippers and / or suction cups are arranged on an upper bending tool, which in turn is attached to an upper clamping jaw. An example of a commercially available turning device of this type is the so-called "sheet metal turning unit" from Thalmann, the functionality of which can be seen in a video available at https: / / www.youtube.com / watch?v=xQluWyKwc6A. This variant also uses an extendable workpiece table. When extended, the workpiece is completely outside the receiving area. To turn the workpiece, the bending tool is pivoted forward so that the attached grippers come into contact with the top of the workpiece. The top side is gripped, and the workpiece is pivoted back along with the bending tool, rotating the workpiece by more than 90 degrees into a partially turned state.The workpiece is then released and slides from the partially turned position back onto the workpiece table. Since the previously turned top side is already facing down in the partially turned position, the workpiece falls onto the previously turned top side, which consequently forms the new bottom side. The workpiece rests completely turned on the workpiece table. The workpiece table can then be retracted.

[0010] A turning device arranged within the receiving area of a long-form folding machine is also known from the prior art. The company ASCO uses such a turning device, as can be seen in a video available at https: / / www.youtube.com / watch?v=IJtcBh_U_jA. The grippers of the turning device are arranged within the receiving area and protrude between table assemblies. For turning, an upper clamping jaw is pivoted upward to create space inside the machine. The turning then takes place in the enlarged receiving area by appropriately moving the grippers.

[0011] Depending on the turning device used, turning may be difficult if a particularly large workpiece is being used. Furthermore, edges of the workpiece may be bent if it is released before it has been completely set down. Therefore, there are limitations for certain workpieces and certain workpiece geometries that can make turning difficult or impossible.

[0012] Although various variants of turning devices exist, based on the state of the art there is still a need for a way to turn a workpiece in a controlled, damage-free and reliable manner.

[0013] This object is achieved according to the invention by a processing machine designed as a long bending machine and a method according to the independent claims. Further developments can be found in the dependent claims.

[0014] According to the invention, a processing machine designed as a long-folding machine for processing a sheet metal workpiece can comprise a workpiece table that defines a support surface onto which the workpiece can be placed at least in part during processing. Furthermore, the processing machine can comprise a processing unit for processing the workpiece. The processing can take place with the workpiece placed on the support surface. The workpiece table can comprise at least one table assembly having a base plate and a pivoting plate, wherein the base plate and the pivoting plate each define a section of the support surface, and wherein the pivoting plate is pivotably mounted relative to the base plate such that a pivoting movement of the pivoting plate can be generated for turning the workpiece.

[0015] Furthermore, a workpiece table for a processing machine can define a support surface onto which a workpiece can be placed during processing such that the workpiece rests at least partially on the support surface. The workpiece table can comprise a table assembly having a base plate and a pivot plate, wherein the base plate and the pivot plate each define a portion of the support surface, and wherein the pivot plate is pivotable relative to the base plate, in particular in an automated manner, such that a pivoting movement for turning the workpiece can be generated. The workpiece table can be a workpiece table for a processing machine according to the invention.

[0016] The invention further relates to a method for machining a sheet metal workpiece using a processing machine designed as a long-edge bending machine. The processing machine comprises a workpiece table defining a support surface onto which the workpiece can be placed, at least in part, during processing. The processing machine further comprises at least one processing unit for processing the workpiece. The workpiece table comprises at least one table assembly having a base plate and a pivot plate. The base plate and the pivot plate each define a portion of the support surface, and the pivot plate is pivotably mounted relative to the base plate. The method may comprise placing the workpiece onto the support surface. The method may also comprise machining the workpiece.Furthermore, the method may include generating a pivoting movement of the pivoting plate in order to turn the workpiece. The method may also include machining the turned workpiece. In particular, the method is carried out using a processing machine according to the invention and / or using a workpiece table according to the invention.

[0017] The features of the invention allow a workpiece to be turned in a controlled manner. Damage during turning can be avoided. Turning can be carried out very reliably. By turning the tool using a swivel plate that is part of a table assembly, restrictions on turning processes can be largely eliminated. Furthermore, turning can be performed extremely time-efficiently. Turning can also be performed at virtually all stages of workpiece processing and / or for very different workpiece geometries.

[0018] According to the invention, the processing machine is a bending machine designed as a long-folding machine. The bending machine can be, for example, a single-column or a double-column bending machine. The invention generally extends to machines such as, in particular, two-column machines, in which the workpiece table can extend to a rear side of the machine or in which the workpiece table is accessible over an entire bending length from two opposite sides, i.e., from the front and the rear. The turning device can then be arranged on the rear side. In other words, viewed from a side from which the machine can be fed, the swivel plate can be arranged behind the base plate. The workpiece can then be turned, for example, behind the processing tool.

[0019] The workpiece can be clamped in a clamping plane. The clamping plane can be defined by the support surface. The base plate and / or the pivoting plate can have an at least substantially closed surface. The base plate and / or the pivoting plate can also define the support surface in other ways, for example, by providing suitable support points. For example, the base plate and / or the pivoting plate can be designed, at least in sections, to be grid-like, grate-like, net-like, perforated, ribbed, dimpled, etc. The term "plate" can be understood primarily in a functional sense within the context of this disclosure.

[0020] The processing machine and / or the workpiece table can comprise multiple table assemblies that together define the support surface. The processing machine and / or the workpiece table can comprise different table assemblies. For example, at least one table assembly with a swivel plate and at least one further table assembly without a swivel plate can be provided. The table assembly or table assemblies can functionally form a table on which the workpiece can be placed.

[0021] The workpiece is turned in particular in such a way that a side of the workpiece, which before turning represents a bottom side lying on the support surface, represents a top side facing away from the support surface after turning. In other words, turning can be distinguished from rotation, in which the orientation of the workpiece is changed but its top side remains unchanged. Turning can occur around an axis that lies in a main plane of extension of the workpiece. The pivoting movement occurs in particular from a plane defined by the support surface.

[0022] In some embodiments, the processing machine and / or the workpiece table and / or the table assembly can comprise a rotating unit by means of which the workpiece can be rotated. Accordingly, the method according to the invention can include a step in which the workpiece is rotated. The rotating can occur independently of the turning. The rotating occurs, for example, around an axis that is at least substantially perpendicular to the main extension plane of the workpiece.

[0023] The workpiece table can be designed as a module. A modular workpiece table can be used for different machine types. Alternatively, the workpiece table can be integrated with other components of the processing machine.

[0024] The processing machine and / or the workpiece table preferably comprises a control unit configured to control different components and thus, for example, to implement a semi-automated or automated control system. Particularly if the workpiece table is modular, it can have its own control unit that can be connected to a control unit of the processing machine and / or is configured to exchange data with it and, for example, receive commands from it.

[0025] The processing machine preferably comprises a first clamping jaw and / or a second clamping jaw. The clamping jaws can be plate-like and / or plate-shaped. The clamping jaws can be inclined away from a bending area and define a tapered receiving area. In the clamped state, for example, a clamped section of the workpiece rests on the support surface in the receiving area. A section of the workpiece to be bent can protrude from the receiving space between the clamping jaws. When the section to be bent is bent about a bending axis, it is pivoted relative to the clamping jaws. The clamping jaws preferably define the bending axis.

[0026] The processing unit comprises, in particular, a processing tool that is movable relative to the workpiece table. The processing unit can be arranged on a clamping jaw. This allows, for example, bending to be performed by the bending unit moving its processing tool toward the workpiece and / or exerting a tensile force on the workpiece.

[0027] Restrictions due to cramped space conditions during turning can be avoided and / or a high degree of freedom with regard to workpiece geometries to be turned can be achieved in particular if the processing machine comprises a receiving area in which the workpiece is arranged and / or can be arranged at least in sections during processing, wherein the pivoting plate for turning is arranged and / or can be arranged outside the receiving area. The receiving area can be arranged behind the aforementioned clamping cheeks, as viewed from the processing tool. The aforementioned clamping cheeks can provide access to the receiving area, for example when they are moved away from one another. Turning can take place towards the receiving area. Turning preferably takes place completely outside the receiving area.It goes without saying that, depending on the machine's design, the swivel plate can be positioned in front of or behind the receiving area. The terms "in front of" and "behind" can refer to the front of the machine. This can be defined by a side from which loading takes place during normal operation and / or by a side where the section of the workpiece to be bent is located during bending.

[0028] In one embodiment, the processing unit is configured to bend a section of the workpiece to be bent relative to a clamped section of the workpiece about a bending axis. The pivoting movement of the pivot plate can be defined by at least one pivot axis that is arranged at least substantially parallel to the bending axis. This makes it possible to achieve high efficiency, for example because no unnecessarily extensive additional movements of the workpiece are required when it is turned between bending operations. The bending axis is preferably located in a close region of a plane defined by the support surface. The close region can, for example, be an area whose points are at most 5 cm, preferably at most 2 cm, and particularly preferably at most 1 cm away from said plane.If the pivoting movement of the pivoting plate is described by a specific trajectory, which in particular deviates from a circular trajectory, the trajectory can run in a plane that is perpendicular to the bending axis.

[0029] Damage-free and controlled turning can be achieved in particular if the table assembly has a holding unit that is designed to hold the workpiece stationary relative to the pivoting plate for turning, so that the workpiece, in a held state, follows a movement of the pivoting plate. This can also be achieved in particular if, in the method according to the invention, the workpiece is held stationary relative to the pivoting plate during turning. The holding unit can have at least one holding element. The holding element can be part of the pivoting plate. Preferably, the holding element is designed to exert a holding force on the workpiece in a held state, for example a mechanical and / or hydraulic and / or magnetic and / or pneumatic holding force.

[0030] The holding unit can have at least one controllable drive. The drive of the holding unit can be pneumatic and / or hydraulic and / or electric. In some embodiments, the drive is a threaded spindle drive. The holding unit can also have a power transmission by means of which an actuating force can be transmitted from the drive to at least one holding element, such as a chain transmission and / or a Bowden cable and / or a rod assembly and / or a belt and / or a gear.

[0031] The holding unit can be configured to hold the workpiece using negative pressure. For example, the holding unit can comprise one or more suction grippers and / or suction cups. A vacuum line can be provided that runs through the base plate to the pivoting plate and is connected, for example, to a vacuum generating device such as a vacuum pump, preferably via at least one suitably controllable shut-off valve. The vacuum generating device can be attached to a frame of the table assembly and / or the bending machine and / or be part of the same. In other embodiments, one or more vacuum generators can be provided in the pivoting plate, such as mechanically and / or hydraulically actuated suction grippers.

[0032] Alternatively or additionally, the holding unit can be configured to magnetically hold the workpiece. For example, the holding unit and / or the pivoting plate can comprise at least one switchable magnetic element, such as an electromagnet, that can be switched between a holding state and a release state.

[0033] According to one embodiment, the holding unit comprises at least one holding element that is movable relative to the pivoting plate and configured to selectively clamp and release the workpiece on the pivoting plate. The holding element that is movable relative to the pivoting plate can, for example, be a holding claw that can be pivoted toward the workpiece for clamping. Several holding elements can be provided, which can be moved collectively and / or individually, for example, to hold the workpiece in specific areas depending on its geometry.

[0034] In particular, if the processing machine and / or the workpiece table comprises a movement device configured to automatically generate the pivoting movement of the pivot plate, a high degree of reliability and / or efficiency can be achieved. In some embodiments, the movement device can generate the pivoting movement from a movement of the table assembly and / or from a movement of the processing tool. The movement device can be configured to pivot the pivot plate according to a predetermined movement plan. The movement plan can, for example, include a target pivot angle and / or a speed profile for a temporal pivot angle change. The pivoting movement can generally be parameterized using at least one pivot parameter. The pivot parameter can, for example, be an angle between the sections of the support surface that define the base plate and the pivot plate, respectively.Alternatively or additionally, the swivel parameter can indicate a position along a swivel trajectory. The motion plan can be based on a temporal progression of the at least one swivel parameter. It can be specified how far and / or how fast the swivel plate is swiveled relative to the base plate.

[0035] The movement device can comprise a separate drive for the swivel plate, which has proven advantageous, for example, in a modular design of the workpiece table. The separate drive can be controlled by the control unit. The drive can be pneumatic and / or hydraulic and / or electric. For example, it can be an electric motor, a hydraulic cylinder, a linear actuator, or the like, if necessary in combination with a suitable gear. In some embodiments, the drive is a threaded spindle drive. The movement device can comprise a power transmission configured to transmit an actuating force for generating the swivel movement from a location spaced from the swivel plate to the swivel plate.The power transmission may, for example, comprise a chain transmission and / or a Bowden cable and / or a linkage and / or a belt and / or a gear and / or a compressed air line and / or a hydraulic line.

[0036] According to one embodiment, the movement device has at least one force converter that converts a generated actuating force into a force required to generate the pivoting movement. The force converter can be a lever, for example. This allows a drive force to be suitably adjusted, allowing the use of virtually any force generator. The force converter, in particular, effects a reduction or transmission of an applied force.

[0037] Targeted utilization of existing drive power and the associated low additional structural complexity, as well as high cost efficiency due to multifunctional components, can be achieved in particular if the machining unit and preferably the machining tool are configured to provide an actuating force to generate the pivoting movement. In some embodiments, it can be provided that an actuating force of the machining unit and / or a movement of the machining tool can be applied in a targeted manner to a force introduction section. The force introduction section can be part of the movement device. The pivot plate can thus be pivoted by actuating the machining unit and / or moving the machining tool.For example, the machining unit can be brought into an actuation state in which a targeted action can be exerted on the force introduction section, for example by positioning the machining tool on the force introduction section. The machining tool can then exert a tensile force and / or a compressive force on the force introduction section. The force introduction section can also have several different force introduction elements, for example, a force introduction element for pivoting the pivot plate and / or a force introduction element for pivoting the pivot plate back, for example, from a pivoted state to a non-pivoted state.

[0038] Starting from a non-pivoted state, the pivot plate can be pivoted by at least 90 degrees, preferably by at least 120 degrees, and in particular by 180 degrees. The specified angle can refer to an angle between the sections of the support surface that define the pivot plate and the base plate, respectively.

[0039] Complete, controlled turning is particularly possible if, in a maximally pivoted state of the pivot plate, a gap remains between the pivot plate and the base plate, in particular a gap with a thickness of at least 3 mm, preferably of at least 4 mm, and particularly preferably of at least 5 mm. The gap is preferably adapted to a maximum thickness of the workpiece. In the maximally pivoted state, a held portion of the workpiece can be arranged in the gap. This allows the workpiece to be turned 180 degrees without it having to fall or slide to any significant extent.

[0040] According to one embodiment, the table assembly comprises at least one coupling, in particular a coupling joint, which pivotably couples the swivel plate to the base plate. This allows almost any desired movement path for the swivel plate to be defined, resulting in a high degree of flexibility with regard to the workpieces to be handled. The coupling can define a single pivot axis and / or a circular arc-shaped movement path for the swivel plate and can be designed, for example, as a rotary joint. In other embodiments, the coupling can define a movement path for the swivel plate that deviates from a circular path. This can be achieved, for example, by a suitable coupling joint or coupling mechanism comprising several elementary joints.

[0041] As mentioned, the processing machine can comprise a machine frame. The table assembly can be linearly movable relative to the machine frame. In particular, the table assembly can be linearly movable parallel to the support surface and / or perpendicular to the bending axis. The table assembly can be advanced and retracted between the clamping jaws. The table assembly can be at least partially retractable from the recessed area, whereby the extension can increase the distance between the swivel plate and the clamping jaws and / or the processing unit.

[0042] In one embodiment, the movement device is designed to generate the pivoting movement of the pivot plate from a movement of the table assembly relative to the machine frame. For this purpose, a force introduction element can be provided on the base plate, which transmits a force to the pivot plate via a force transmission when the force introduction element comes into contact with a stationary component, for example of the machine frame. In some embodiments, a stop can be provided against which the force introduction element rests when the table assembly is advanced beyond a certain point. The advancement of the table assembly can then be directly accompanied by the pivoting of the pivot plate. In further embodiments, a suitable force introduction element can also be provided on the pivot plate, which causes the pivot plate to pivot when the table device is moved.

[0043] Furthermore, in one embodiment it is provided that the processing machine and / or the workpiece table comprises a handling device which is designed to move the workpiece for handling before, during and / or after processing relative to the table assembly, in particular perpendicular to the bending axis and / or parallel to the support surface, and to fix the workpiece if necessary, wherein the handling device has at least one handling element which is designed to act mechanically on the workpiece in order to move it, in particular to advance it, onto the pivot plate before turning it and / or to move it, in particular to retract it, from the pivot plate at least partially onto the base plate after turning it.The method according to the invention can comprise moving, in particular pushing, the workpiece onto the pivoting plate such that the workpiece is completely moved, in particular pushed, off the base plate before the pivoting movement for turning the workpiece is generated. Furthermore, the method can comprise moving, in particular retracting, the workpiece at least partially onto the base plate, in particular after turning has taken place. By moving the workpiece completely onto the pivoting plate, it can be pivoted in a controlled manner by being able to move freely with the pivoting plate.

[0044] The present invention is described below by way of example with reference to the accompanying figures. The drawings, the description, and the claims contain numerous features in combination. Those skilled in the art will conveniently consider the features individually and use them in meaningful combination within the scope of the claims. They show: Fig. 1 is a perspective schematic representation of a processing machine with a workpiece table; Fig. 2 is a schematic side view of a part of the processing machine with the workpiece table in a completely unpivoted state; Fig. 3 is a schematic side view of a part of the processing machine with the workpiece table in a partially pivoted state; Fig. 4 is a schematic side view of a part of the processing machine with the workpiece table in a completely pivoted state; Fig. 5 is a schematic side view of an alternative embodiment of a table assembly of a workpiece table; Fig. 6 is a schematic side view of a further alternative embodiment of a table assembly of a workpiece table; Fig. 7 is a schematic plan view of a part of the table assembly according to the further alternative embodiment;Fig. 8 is a schematic representation of a portion of yet another alternative embodiment of a table assembly; Fig. 9 is a schematic representation of a portion of yet another alternative embodiment of a table assembly; and Fig. 10 is a schematic flow diagram of a method for machining a workpiece made of flat material.

[0045] Fig. 1 shows a schematic perspective view of a processing machine 10 according to the invention, which is designed as a long bending machine.

[0046] The processing machine 10 is set up to process a workpiece 12 (cf. Fig. 2). In the present case, the processing machine 10 is configured to process a sheet metal workpiece 12 by repeatedly bending it around a bending axis 32 in a known manner. The processing machine 10 has a machine frame 50. Furthermore, the processing machine 10 has a workpiece table 14, which defines a support surface 16 onto which the workpiece 12 can be placed during processing.

[0047] The processing machine 10 comprises a control unit 11. This can be connected to a display device that serves as a user interface or is part of such a user interface. It is understood that the functions of the processing machine 10 described below can be controlled by the control unit 11. The control unit 11 can accordingly comprise a computer-readable medium with suitable program code.

[0048] The processing machine 10 further comprises a clamping jaw 56 and a further clamping jaw 57, by means of which the workpiece 12 can be firmly clamped during processing. At least one of the clamping jaws 56, 57 is movable relative to the machine frame 50. In the illustrated case, the further clamping jaw 57, which is designed as the upper clamping jaw, can be pivoted upward relative to the machine frame. Furthermore, at least one of the clamping jaws 56, 57 can be linearly and / or pivotably movable relative to the workpiece table 14.

[0049] The processing machine 10 defines a receiving area 26 in which the workpiece 12 is arranged at least in sections during processing. In the illustrated case, the receiving area 26 is arranged between the clamping cheeks 56, 57. The workpiece protrudes partially from the receiving area 26 between the clamping cheeks 56, 57 during processing. This defines a clamped section 30 and a section 28 of the workpiece 12 to be bent. Fig. 2 These two sections 28, 30 are provided with reference numerals, it being understood that bending of the workpiece 12 about the bending axis 32 has already taken place in order to Fig. 2 to obtain the workpiece geometry shown. Specifically, the section 28 to be bent was bent downward relative to the clamped section 30.

[0050] The processing machine 10 has a processing unit 18 and a further processing unit 19. These are described with reference to Fig. 2 briefly described. The processing unit 18 is attached to the clamping cheek 56. The processing unit 18 comprises a base element 58. The base element 58 is wedge-shaped in the illustrated case. The base element 58 is mounted for linear movement on a surface of the clamping cheek 56. The processing unit 18 further comprises a processing tool 60. The processing tool 60 is in turn mounted for linear movement on a surface of the base element 58. A movement path of the processing tool 60 can thus be generated by moving the base element 58 relative to the clamping cheek 56 and / or the processing tool 60 relative to the base element 58. The functioning of such a bending unit is described, for example, in DE 10 2018 000344 B3.

[0051] In the illustrated case, the additional bending unit 19 is also attached to the additional clamping jaw 57. The additional bending unit 19 is constructed analogously to the bending unit 18. Consequently, the workpiece can be bent either upwardly or downwardly around the bending axis 32 by means of the two bending units 18, 19.

[0052] In the following we will again refer to Fig. 1 Reference is made to the workpiece table 14. The workpiece table 14 comprises at least one table assembly 20, which has a base plate 22 and a pivot plate 24. In the illustrated case, the workpiece table 14 comprises several table assemblies. These can be identical or different. In particular, it can be provided that only some or one of the table assemblies have a pivot plate.

[0053] The base plate 22 and the pivot plate 24 each define a section of the support surface 16. The pivot plate 24 is pivotally mounted relative to the base plate 22 such that a pivoting movement can be generated by means of which the workpiece 12 can be turned. When the workpiece 12 is turned, its top side is turned downward and its bottom side is turned upward.

[0054] The pivot plate 24 forms a front end of the table assembly 20. In other words, the pivot plate 24 defines a frontmost area of the support surface 16. The term "front" refers to the side of the bending machine 10 on which the processing units 18, 19 are arranged. The processing machine 10 is loaded from this side.

[0055] In other embodiments, the pivot plate can form a rear end of the table assembly. This is suitable, for example, for machines where the workpiece table is accessible from both the front and the rear. For example, if a specific machining operation requires the workpiece to be placed on the workpiece table from a first side of the machine, the pivot plate can be arranged behind the base plate when viewed from this first side. The pivot plate can be arranged on a second side of the machine, opposite the first side.

[0056] The table assembly 20 is linearly movable relative to the machine frame 50. Specifically, the table assembly 20 can be movable perpendicular to the bending axis 32. The table assembly 20 can be partially moved out of the receiving area 26 and / or retracted into it.

[0057] In the illustrated long-form bending machine, the table assembly 20 is retracted to such an extent that only the workpiece 12 protrudes between the clamping jaws 56, 57. This allows a corresponding protruding section to be bent upwards or downwards toward one of the clamping jaws without the table assembly 20 hindering the bending movement.

[0058] The processing machine 10 or the workpiece table 14 further comprises a handling device 52. This is configured to move the workpiece 12 relative to the table assembly 20. In the illustrated case, several handling devices 52 are present, only one of which is provided with a reference numeral. The handling device 52 has a handling element 50 that is configured to mechanically act on the workpiece 12. For example, the handling element 50 can be pivoted toward the surface of the workpiece 12 and / or lifted away from it, whereby the workpiece 12 can be selectively held on the support surface 16. In addition, the handling element 50 can be movable relative to the table assembly 20, whereby the workpiece 12 can be moved in the support surface 16. By means of the handling device 52, the workpiece 12 can be advanced or retracted on the table assembly 20, for example, in order to move it out of the receiving area 26.The handling device 52 can also be used to hold the workpiece 12 on the support surface 16 during machining.

[0059] In Fig. 2 to Fig. 4 a part of the processing machine 10 is shown. The illustrations serve to illustrate a turning process of the workpiece 12. In Fig. 2 to Fig. 4 For the sake of clarity, some reference symbols have been omitted.

[0060] Before turning, the workpiece 12 is fully advanced onto the swivel plate 24. It then no longer rests on the section of the support surface 16 defined by the base plate 22. This can be done with the table assembly 20 retracted, for example, by means of the handling device 52.

[0061] The table assembly 20 comprises a holding unit 34. The holding unit 34 comprises one or more holding elements 36, of which only one is provided with a reference numeral for reasons of clarity. The holding elements 36 are formed on or in the pivot plate 24. In the embodiment shown, the holding elements 36 are suction cups. These are connected to a vacuum generator, such as a vacuum pump or the like, via compressed air lines (not shown) that run through the pivot plate 24 and the base plate 22. The vacuum generator is arranged, for example, on the machine frame 50.

[0062] In other embodiments, a movable clamping device can serve as the holding element, which can optionally mechanically fix the workpiece 12 to the pivot plate 24. Switchable and / or magnetic holding elements can also be used according to the invention.

[0063] Regardless of the precise design of the holding element 36, it is configured to selectively hold or release the workpiece 12 relative to the pivot plate 24. In a held state, the workpiece 12 moves with the pivot plate 24 when it is pivoted. As a result, the pivoting movement of the pivot plate 24 can serve as a turning movement for the workpiece 12. In the released state, however, the workpiece 12 is movable relative to the pivot plate 24.

[0064] Starting from Fig. 2In the completely unpivoted state of the pivot plate 24 shown, in which the workpiece 12 is fully advanced onto the pivot plate, the pivot plate 24 is pivoted about a pivot axis 33. As a result, an underside of the workpiece 12, which rests on the pivot plate 24, becomes the new top side of the workpiece 12, whereas an upper side of the workpiece 12, after turning, rests as the underside on the base plate 22. The pivot axis 33 is arranged parallel to the bending axis 32.

[0065] As in Fig. 7As can be seen, when the pivot plate 24 is fully pivoted, a gap 46 is formed between the base plate 22 and the pivot plate 24. This gap 46 can be a few millimeters thick, whereby the workpiece 12 can be received in the gap 46 when the pivot plate 24 is fully pivoted. The pivoting movement of the pivot plate 24 can thus be completed to such an extent that the workpiece 12 is completely turned before it is released from the holding unit 34. In the case shown, a maximum pivot angle of 180° is provided.

[0066] In other embodiments, the gap 46 may be omitted and / or the maximum pivot angle may be smaller.

[0067] Turning the workpiece 12 may involve releasing the workpiece 12 by the holding unit 34 and subsequently sliding and / or dropping the workpiece 12 onto the base plate 22. This may occur when the entire available swivel angle is not utilized, or when the maximum swivel angle is less than 180°.

[0068] In the following we will again refer to Fig. 1Reference is made to the following. The processing machine 10 comprises a movement device 38 configured to automatically generate the pivoting movement of the pivot plate 24. The movement device 38 can be connected to the control unit 11. In the illustrated case, the movement device 38 comprises a separate drive 40. The movement device 38 and the separate drive 40 are shown only schematically. Various drives can be used, such as hydraulic cylinders, air cylinders, threaded spindles, gears with various drives, linear actuators, etc.

[0069] In the exemplary embodiment according to Fig. 1The separate drive 40 is arranged at a distance from the pivot plate 24. The movement device 38 therefore comprises a power transmission such as a Bowden cable, a hydraulic line, a compressed air line, a belt, a chain, a gear, or the like, in order to transmit an actuating movement generated by the separate drive 40 to the pivot plate 24.

[0070] Alternatively, a separate drive can be provided directly on and / or in the pivot plate 24. For example, an electric motor can be provided directly in the area of an articulated connection of the pivot plate 24 to the base plate 22, which can be optionally supplied with electrical energy to generate the pivoting movement of the pivot plate 24.

[0071] Further variants concerning the generation of the pivoting movement of the pivot plate 24 are described below with reference to Fig. 6 to Fig. 9 described.

[0072] Fig. 5shows a further embodiment of a table assembly 120. This can be used as an alternative to the table assembly 20 described above. Analogously, the table assembly 120 comprises a base plate 122 and a pivot plate 124. The table assembly 120 comprises a coupling joint 148 that pivotably couples the pivot plate 124 to the base plate 122 and defines a path of movement of the pivot plate 124 that deviates from a circular path. The coupling joint 148 is shown only schematically, and its individual joints are not shown in detail. The coupling joint 148 can be configured in any suitable manner and comprise several solid members connected by joints. The coupling joint 148 can be a spatial gear. This can define a complex pivoting movement, which, for example, includes a backswing movement that prevents the workpiece 12 from becoming clamped on an edge when turning.

[0073] In one embodiment, the coupling joint 148 is adjustable so that the movement path can be varied. This can be done automatically or manually. The pivoting movement can thus be adjusted to the geometry of a workpiece to be turned, so that the workpiece can be turned in a targeted and / or damage-free manner, even if it has already been machined and, for example, has one or more bending points.

[0074] Fig. 6 and Fig. 7illustrate a further embodiment. In this embodiment, a table assembly 220 is used, which has a base plate 222 and a pivot plate 224 pivotally mounted thereon about a pivot axis 233. The table assembly 220 includes a movement device 238 with a power transmission 242, which is configured to transmit an actuating force for generating the pivoting movement from a location spaced from the pivot plate 224 to the pivot plate 224. The power transmission 242 is shown merely by way of example and can be configured to transmit a tensile force and / or a compressive force. As mentioned above, any suitable power transmissions can be used.In principle, it can also be provided according to the invention that the pivot plate 224 is spring-biased, in particular damped, and, for example, automatically returns to its completely non-pivoted state when an actuating force is not applied or automatically moves to a maximally pivoted state when an actuating force is not applied.

[0075] The movement device 238 may include a separate drive, as in the embodiment described above. An actuating force provided by the separate drive can then be transmitted to the pivot plate 224 via the force transmission 242.

[0076] In the embodiment according to Fig. 6 and Fig. 7The movement device 238 also includes a force converter 244. This force converter 244 converts an actuating force to generate the pivoting movement of the pivot plate 224. In the example shown, the force converter 244 is a lever. This lever is formed by the pivot plate 244 itself. The force converter 244 projects beyond the pivot axis toward the base plate 222. This projection can be used as a lever by engaging the force transmission 242. As shown in Fig. 7 As is illustrated schematically, several protruding elements may be present, for example if force is to be transmitted to the pivot plate 224 at several points.

[0077] In certain embodiments, the processing unit 18 and / or the processing unit 19 can be configured to provide an actuating force to generate the pivoting movement. It is understood that this can also be the case for other types of processing machines and correspondingly differently designed processing units. For this purpose, a movement device can be designed such that a movement provided by the corresponding processing unit is transmitted to the pivoting plate. In the embodiment according to Fig. 6 and Fig. 7 For example, the processing unit 18 can act on an end of the power transmission 242 not shown.

[0078] Fig. 8 and Fig. 9schematically illustrate embodiments in which a processing unit serves to provide the actuating force for the pivot plate. The figures each show a section of a base plate 322, 422 of a table assembly 320, 420. A pivot plate, as described above in connection with other embodiments, is connected to each of these.

[0079] In the embodiment according to Fig. 8A movement device 338 comprises a force introduction element 362, which is designed to enable force introduction from a processing unit. In the case shown, the force introduction element 362 is designed as a lever, on which a processing tool 360 of a processing unit (not shown in detail) can act. The force introduction element 362 is mounted on the base plate 322 in such a way that it can be pivoted in two directions. Moving the force introduction element 362 in a first direction causes the pivot plate to pivot towards the base plate 322, while moving it in the opposite direction causes the pivot plate to pivot back into its completely unpivoted state. The schematically illustrated force transmission 342 can, for example, be a rod assembly. However, one or more hydraulic lines, Bowden cables, belts, chains, etc. can also be used, if necessary in combination.

[0080] In the embodiment according to Fig. 9A movement device 438 comprises a power transmission 442 which comprises two force introduction elements 462, 464. These are each designed as hydraulic cylinders and connected to a separate hydraulic line leading to the pivot plate (not shown) and connected to an actuating mechanism for the pivot plate. Likewise, each of the force introduction elements can be a lever which actuates a rod assembly or the like. Furthermore, the force introduction elements can be connected to Bowden cables. The force introduction elements 462, 464 are each arranged and configured such that a machining tool 460 of a machining unit (not shown in detail) can act thereon. Actuating a first force introduction element 462 causes the pivot plate to pivot towards the base plate 422.Actuating a second force-introducing element 462 causes the pivoting plate to pivot back into its completely unpivoted state. The force-introducing elements 462, 464 can optionally be configured to respond to a compressive force or a tensile force applied by the machining tool 460.

[0081] Instead of the machining unit acting on a force introduction element, it can also be provided that one or more stops are provided that act on a force introduction element when the table assembly 20 is moved relative to the machine frame 50. The pivoting movement is then generated by moving the table assembly 20. The corresponding force introduction element can be arranged either directly on the pivot plate 24 or at an end of a force transmission spaced apart from it.

[0082] Fig. 10shows a schematic flow diagram of a method for machining a workpiece made of flat material. The method is explained below using the processing machine 10 described above as an example. However, it is understood that the method can also be performed using another processing machine that has a corresponding workpiece table.

[0083] In a process step S1, the workpiece 12 is placed on the support surface 16.

[0084] In a process step S2, the workpiece 12 is machined. For example, the workpiece 12 is bent downwards around the bending axis 32.

[0085] In an optional method step S3, the workpiece 12 is advanced onto the pivot plate 24 such that it is completely pushed off the base plate 22. This is done, for example, by means of the handling device 52. The optional method step S3 may alternatively or additionally include extending the table assembly 20.

[0086] In an optional process step S4, the workpiece 12 is temporarily fixed to the pivot plate 24. This can be done, for example, using the holding unit 34 described above.

[0087] In a method step S5, a pivoting movement of the pivot plate 24 is generated in order to turn the workpiece 12. The pivot plate 24 can be arranged outside the receiving area 26. The pivoting of the workpiece 12 can therefore take place entirely outside the receiving area 26. If the workpiece 12 is temporarily fixed to the pivot plate 24, it follows the movement of the pivot plate 24 accordingly completely. In other variants, it can also be provided that the workpiece 12 can move relative to the pivot plate 24. For example, the workpiece 12 can then be turned by resting on one of its edges against a holding element that is spaced from the pivot plate 24 and thus ensures that the workpiece 12 is not moved in an uncontrolled manner, but slides relative to the pivot plate 24.

[0088] In an optional process step S6, the workpiece 12 is partially retracted or pushed back onto the base plate 22, if necessary. The optional process step S6 may alternatively or additionally include retracting the table assembly 20.

[0089] Finally, in a process step S7, the turned workpiece 12 is machined.

Claims

1. A long folding machine (10) for machining a workpiece (12) made of sheet metal, comprising: a workpiece table (14) defining a supporting area (16) on which the workpiece (12) can be placed at least in sections during machining; and at least one machining unit (18) for machining the workpiece (12) while the workpiece (12) is placed on the supporting area (16); characterized in that the workpiece table (14) comprises at least one table assembly (20) having a base plate (22) and a swivel plate (24), the base plate (22) and the swivel plate (24) each defining a portion of the supporting area (16), and the swivel plate (24) being pivotably mounted relative to the base plate (22) in such a way that a swivel movement of the swivel plate (44) can be generated for turning the workpiece (12) over.

2. The long folding machine (10) of claim 1, further comprising a receiving area (26) in which the workpiece (12) can be arranged at least in sections during machining, wherein the swivel plate (24) is arranged and / or can be arranged outside the receiving area (26) for turnover.

3. The long folding machine (10) of claim 1 or 2, wherein the machining unit (18) is configured to bend a portion (28) of the workpiece (12) to be bent over relative to a clamped portion (30) of the workpiece (12) about a bending axis (32), and wherein the swivel movement of the swivel plate (24) is defined by at least one swivel axis (33) arranged parallel to the bending axis (32).

4. The long folding machine (10) of any one of the preceding claims, wherein the table assembly (20) comprises a holding unit (34) configured to keep the workpiece (12) stationary relative to the swivel plate (24) for turnover so that the workpiece (12), when held, follows a movement of the swivel plate (24).

5. The long folding machine (10) of claim 4, wherein the holding unit (34) is configured to hold the workpiece (12) by means of negative pressure.

6. The long folding machine (10) of claim 4 or 5, wherein the holding unit (34) comprises at least one holding member (36) that is movable relative to the swivel plate (24) and configured to selectively clamp and release the workpiece (12) on the swivel plate (24).

7. The long folding machine (10) of any one of the preceding claims, further comprising a movement device (38) configured to automatically generate the swivel movement of the swivel plate (24).

8. The long folding machine (10) of claim 7, wherein the movement device (38) comprises a separate drive (40) for the swivel plate (24).

9. The long folding machine (10) of claim 7 or 8, wherein the movement device (238) comprises a force transmission (242) configured to transmit an actuating force for generating the swivel movement from a location away from the swivel plate (24) to the swivel plate (24).

10. The long folding machine (10) of any one of claims 7 to 9, wherein the movement device (38) comprises at least one force transducer (244) that converts a generated actuating force into a force required to generate the swivel movement.

11. The long folding machine (10) of any one of the preceding claims, wherein the machining unit (18) is configured to provide an actuating force to generate the swivel movement.

12. The long folding machine (10) of any one of the preceding claims, wherein the swivel plate (24) is pivotable from a non-swiveled state by at least 90 degrees, preferably by at least 120 degrees and in particular by 180 degrees.

13. The long folding machine (10) of any one of the preceding claims, wherein in a state in which the swivel plate (24) is swiveled to a maximum degree, a gap (46) remains between the swivel plate (24) and the base plate (22), in particular a gap having a thickness of at least 3mm, preferably of at least 4mm and particularly preferably of at least 5mm.

14. The long folding machine (10) of any one of the preceding claims, wherein die table assembly (20) comprises at least one coupling joint (148) that pivotably couples the swivel plate (24) to the base plate (22) and that defines a movement path of the swivel plate (24) that deviates from a circular path.

15. The long folding machine (10) of any one of the preceding claims, further comprising a machine frame (50), wherein the table assembly (20) is linearly movable relative to the machine frame (50).

16. The long folding machine (10) of any one of the preceding claims, further comprising a handling device (52) configured to move the workpiece (12) relative to the table assembly (20) for handling before, during and / or after machining and to fix the workpiece (12) as required, wherein the handling device (52) comprises at least one handling member (54) configured to mechanically act on the workpiece (12) to advance it onto the swivel plate (24) before turning it over.

17. A method for machining a workpiece (12) made of sheet metal using a long folding machine (10), in particular using a long folding machine (10) of any one of claims 1 to 16, wherein the long folding machine (10) comprises a workpiece table (14) defining a supporting area (16) on which the workpiece (12) can be placed at least in sections during machining, wherein the long folding machine (10) further comprises at least one machining unit for machining the workpiece (12), and wherein the workpiece table (14) comprises at least one table assembly (20) having a base plate (22) and a swivel plate (24), wherein the base plate (22) and the swivel plate (24) each define a portion of the supporting area (16), and wherein the swivel plate (24) is pivotally mounted relative to the base plate (22), the method comprising: placing the workpiece (12) onto the supporting area (16); machining the workpiece (12); generating a swivel movement of the swivel plate (24) to turn the workpiece (12) over; and machining the turned-over workpiece (12).

18. The method of claim 17, further comprising: advancing the workpiece (12) onto the swivel plate (24) such that the entire workpiece (12) is pushed off the base plate (22) before the swivel movement for turning the workpiece (12) over is generated.