Bending machine and bending tool device

Abstract

The invention relates to a bending machine (1) for producing bent parts from elongated material, wherein the bending machine (1) comprises: a rotary mechanism (2) which has a hollow outer rotary shaft (3) and an inner rotary shaft (4) nested coaxially in the outer rotary shaft (3), wherein at least one of the rotary shafts (3, 4) is rotatable about a rotation axis (D) of the rotary mechanism (2), a bending tool assembly (5) for bending elongated material and a coupling device (6) for detachably coupling the bending tool assembly (5) to the rotary mechanism (2), wherein the bending tool assembly (5) comprises a bending head (7) and a bending mandrel (8) nested coaxially in the bending head (7), wherein the bending mandrel (8) is received by the bending head (7) for common handling.wherein in a coupled state of the bending tool device (5) the bending head (7) is connected to the outer rotary shaft (3) and the bending mandrel (8) is connected to the inner rotary shaft (4) such that by rotating the at least one rotatable rotary shaft (3, 4) the bending head (7) and the bending mandrel (8) are rotatable relative to each other about the axis of rotation (D) in order to bend supplied elongated material.

Description

SCOPE OF APPLICATION AND STATE OF THE ART

[0001] The invention relates to a bending machine for producing bent parts from elongated material. The invention also relates to a bending tool assembly for such a bending machine.

[0002] Bending machines are forming machines in the form of machine tools that, using suitable tools, can produce small or large series of bent parts, some with complex geometries, primarily through forming, from elongated materials such as wire, tube, strip, or the like in an automated manufacturing process. Such a bending machine is designed, for example, to produce two-dimensionally or three-dimensionally bent parts from elongated materials such as wire, strip, or tube by bending. For the efficient production of large quantities of bent parts, the bending machine can be equipped with computer numerical control via a control unit.

[0003] In the production of a bent part, the elongated material can be drawn or conveyed from a material supply to a tooling area of ​​the bending machine by means of a feed device, controlled by an NC control program. A bending tool located downstream in the material feed direction and within the tooling area then forms the fed wire into the desired bent part. Before or after the forming process, the material section intended for producing the bent part can be cut from the fed elongated material by means of a cutting device, particularly on the bending machine, also controlled by the NC control program. This process can be repeated cyclically for each bent part.

[0004] Typically, the bending tool assembly of such a bending machine is designed to be interchangeable. The specific bending tool assembly can be tailored to the part currently being bent. A changeover process to replace the bending tool assembly usually involves a relatively large amount of assembly work. Furthermore, such a changeover often requires tools or even special tools. Frequently, such a changeover process also includes a complex alignment procedure to ensure sufficiently precise alignment of the bending tool assembly relative to at least one drive axis of the bending machine. In addition, conventional bending tool assemblies can have several components that must be handled individually during changeover and that can be lost. TASK AND SOLUTION

[0005] Against this background, it is an object of the present invention to provide a bending machine for the production of bent parts from elongated material and a bending tool assembly for such a bending machine, both of which have improved properties. In particular, a particularly simple and / or reliable change of the bending tool assembly should be made possible.

[0006] This problem is solved by the subject matter of the independent patent claims. Preferred embodiments are the subject matter of the dependent patent claims. The wording of all claims is made clear by reference to the content of the description.

[0007] A bending machine according to the invention is used for producing bent parts from elongated material. The bending machine has a rotary mechanism comprising a hollow outer rotary shaft and an inner rotary shaft. The inner rotary shaft is nested coaxially within the outer rotary shaft. At least one, and in particular both, rotary shafts are rotatable about an axis of rotation of the rotary mechanism, particularly a geometric one. In particular, the outer rotary shaft and / or the inner rotary shaft can be rotatable about the axis of rotation.

[0008] The bending machine according to the invention also includes a bending tool assembly, in particular an interchangeable one. The bending tool assembly is used for bending elongated material. Furthermore, the bending machine has a coupling device designed for the detachable coupling of the bending tool assembly to the rotary mechanism. The bending machine can include a feed device, in particular a controllable one, for feeding in elongated material and for conveying the fed-in elongated material to a tooling area of ​​the bending machine. In a coupled state, the bending tool assembly is located, in particular, in the tooling area of ​​the bending machine.

[0009] The bending tool assembly of the bending machine according to the invention comprises a bending head, in particular a hollow one, and a bending mandrel. The bending mandrel is nested coaxially within the bending head, in particular a hollow one. The bending mandrel is received by the bending head in such a way that the bending head receiving the bending mandrel and the bending mandrel received by the bending head can be handled together for coupling the bending tool assembly to the rotary drive and / or for decoupling the bending tool assembly from the rotary drive, in particular as a single tool unit of the bending tool assembly. In this way, the bending tool assembly as a whole can be handled for coupling to and / or decoupling from the rotary drive, in particular without directly gripping the received bending mandrel and / or when directly gripping only the receiving bending head. In particular, the bending mandrel is rotatable relative to the bending head.In a coupled state of the bending tool assembly, the bending head is connected to the outer rotary shaft and the bending mandrel to the inner rotary shaft in such a way, particularly in a torsionally rigid manner, that the bending head and the bending mandrel can be rotated relative to each other about the axis of rotation by rotating the at least one rotatable rotary shaft. By rotating the bending mandrel and the bending head relative to each other about the axis of rotation, particularly by controlled rotation, the supplied elongated material can be bent to produce the bent part. In particular, the at least one rotatable rotary shaft is designed as the drive shaft of the rotary mechanism.

[0010] The "outer slewing shaft" can be synonymously referred to as the "bending pin shaft". Alternatively or additionally, the "inner slewing shaft" can be synonymously referred to as the "mandrel shaft".

[0011] The term "axial" can conveniently refer to an axial direction of the bending machine, which is defined in particular by the axis of rotation of the rotary mechanism. A radial direction of the bending machine can run perpendicular to the axial direction. A circumferential direction of the bending machine can run in a virtual plane perpendicular to the axial direction. In particular, the axial direction, the radial direction, and the circumferential direction are linearly independent of each other.

[0012] In an embodiment of the invention, the two rotary shafts, in particular, are independently rotatable about the axis of rotation of the rotary mechanism. Specifically, the inner and outer rotary shafts are independently rotatable about the axis of rotation of the rotary mechanism, which is, in particular, geometric. The inner and outer rotary shafts can each define an individually controllable machining axis of the bending machine, with the machining axes running coaxially on the axis of rotation of the rotary mechanism. In the coupled state of the bending tool assembly, the bending head is rotatable about the axis of rotation of the rotary mechanism by means of the outer rotary shaft. In the coupled state, the bending mandrel is rotatable about the axis of rotation of the rotary mechanism by means of the inner rotary shaft.In the coupled state, the bending head, via the outer rotary shaft, and the bending mandrel, via the inner rotary shaft, are each independently rotatable about their respective axes of rotation. To bend the supplied elongated material and produce the bent part, the bending mandrel and the bending head can be rotated relative to each other about their respective axes of rotation, in particular in a controlled and coordinated manner. Advantageously, the outer rotary shaft is designed as the outer drive shaft of the rotary mechanism, while the inner rotary shaft is designed as the inner drive shaft of the rotary mechanism.

[0013] Advantageously, the rotary mechanism comprises a first drive unit for the controlled drive of the outer rotary shaft and a second drive unit for the controlled drive of the inner rotary shaft. The rotary shafts are independently adjustable relative to each other by means of the drive units. In particular, during the production of a bent part, the rotary shafts are adjusted relative to each other in a coordinated, NC-controlled manner using the drive units. The rotary mechanism may include a gearbox for connecting the drive units to each of the rotary shafts.

[0014] In particular, it is understood that in embodiments with only a single rotatable slewing shaft, only a single drive device for controlled driving of the single rotatable slewing shaft can be present.

[0015] In this embodiment of the invention, the bending mandrel is captive and securely held by the bending head, particularly by a positive locking mechanism. This simplifies the changeover process for replacing the bending tool assembly. The bending mandrel can be precisely fitted to the bending head, especially radially, which eliminates the need for an alignment process to radially align the bending mandrel relative to the axis of rotation of the bending machine. In particular, axial alignment of the bending mandrel relative to the bending head is no longer necessary. The tool assembly according to the invention has a particularly compact axial design.

[0016] In one embodiment of the invention, the coupling device has complementary transmission structures designed for positive-locking torque transmission in the coupled state. These complementary transmission structures are located on mutually facing axial end sections of both the outer rotary shaft and the bending head. Specifically, the complementary transmission structures on the bending head and the rotary shaft form a detachable, rotationally fixed axial plug connection between the outer rotary shaft and the bending head. In the coupled state, the transmission structures of the bending head and the outer rotary shaft can engage with each other in a positive-locking manner, particularly with respect to the circumferential direction.Alternatively or additionally, the coupling device has, in particular other, complementary transmission structures for positive-locking torque transmission in the coupled state, wherein these, in particular other, complementary transmission structures are present at mutually facing axial end sections of both the inner rotary shaft and the bending mandrel. In particular, the, in particular other, complementary transmission structures can form a, in particular other, detachable, rotationally fixed axial plug connection between the inner rotary shaft and the bending mandrel. In the coupled state, the transmission structures of the bending mandrel and the inner rotary shaft can be in positive engagement with each other, in particular with respect to the circumferential direction.

[0017] In a further embodiment of the invention, the coupling device includes a connecting device, wherein the connecting device is designed for the releasable axial retention of the bending tool assembly on the rotary mechanism. In particular, the connecting device serves only for the axial retention of the bending tool assembly on the rotary mechanism.

[0018] In a further embodiment of the invention, the connecting element of the coupling device has a radial, in particular circumferential, projection. The connecting element also has a union nut that engages the radial projection. Furthermore, the connecting element has a threaded section that is matched to the union nut and the projection such that the radial projection can be axially secured to the threaded section by means of the union nut. Thus, by screwing the union nut onto the threaded section, the projection engaged by the union nut can be axially held to the threaded section. In particular, the union nut is the only connecting element of the coupling device. The union nut can be designed to be loosened and / or tightened without tools. An anti-rotation device can be provided to prevent the union nut from loosening.

[0019] Due to the axial depth of the transmission structures, the union nut can only be screwed onto the threaded section if the transmission structures are correctly aligned for mutual engagement. This prevents incorrectly oriented mounting of the tool assembly on the turning mechanism.

[0020] In a further embodiment of the invention, an axial end section of the bending head facing the outer rotary shaft has a radial projection. This axial end section carries the captive nut, in particular in a captive manner. An axial end section of the outer rotary shaft facing the bending head has a threaded section. By screwing the captive nut onto the threaded section, the opposing axial end sections of the bending head and the outer rotary shaft can be held axially against each other, in particular so that the end faces of the axial end sections touch each other.

[0021] It is advantageous – particularly as an alternative to the above embodiment – ​​that the axial end section of the bending head facing the outer rotary shaft has the threaded section, wherein the axial end section of the outer rotary shaft facing the bending head has the radial projection and carries the cap nut, in particular in a captive manner.

[0022] In a further, and in particular alternative, embodiment of the invention, the connecting device of the coupling device forms a bayonet lock for releasably axially holding the bending tool device on the rotary mechanism. The bending head can have a first locking part of the bayonet lock, and the outer rotary shaft can have a second locking part of the bayonet lock, which is matched to the first locking part, in particular each being integral.

[0023] Advantageously, the connecting device may include a releasable, in particular screwable and / or snap-out and / or detent, locking element for blocking a bayonet slot of the bayonet fitting. In particular, the bayonet slot is designed to receive and guide a radial bayonet projection of the bayonet fitting. The bayonet slot may be located on one of the locking parts of the bayonet fitting, and the radial bayonet projection on another locking part of the bayonet fitting.

[0024] In a further embodiment of the invention, the bending head has a first bending head component that points axially away from the rotary mechanism when coupled. The bending head also has a second bending head component that differs from the first. In the coupled state, the second bending head component points axially, in particular, towards the rotary mechanism. Specifically, the second bending head component contacts the outer rotary shaft when coupled. The first and second bending head components are axially connected to one another, in particular detachably. The bending mandrel is axially supported, in particular directly, between the first and second bending head components, in particular with axial play. In this way, a captive mounting of the bending mandrel on the bending head can be achieved. The axial play can, for example, be a maximum of 0.1 mm.The bending mandrel can be radially mounted on the first bending head component and / or on the second bending head component, in particular in the manner of a tight clearance fit, so as to be rotatable about the axis of rotation.

[0025] In a further embodiment of the invention, the first bending head component and the second bending head component each partially define a recess of the bending head, particularly one circumferential on the outside. The recess of the bending head can be axially separable by means of the first bending head component and the second bending head component. A captive nut of the coupling device is at least partially and captively received in the recess of the bending head. In particular, the captive nut is provided by the connecting element of the coupling device and can thus serve to axially hold the tool assembly on the rotary unit.

[0026] In a further, particularly alternative, embodiment of the invention, mutually facing axial end sections of both the outer rotary shaft and the bending head each have at least two positive-locking contour areas on their outer circumference. The outer rotary shaft thus has two such positive-locking contour areas, and the bending head also has two such positive-locking contour areas. The positive-locking contour areas of both the outer rotary shaft and the bending head can be diametrically opposed to each other. The connecting element of the coupling device has at least two clamps that are designed to be complementary to the positive-locking contour areas.In the coupled state, the at least two claws engage radially, in particular in a clamp-like manner, both in one of the form-locking contour areas of the outer rotary shaft and in one of the form-locking contour areas of the bending head, so that the bending tool device is held axially to the rotary mechanism by means of the claws in a form-locking manner.

[0027] In a further embodiment of the invention, the clamps, in particular diametrically opposed to each other, are each detachably fastened radially to the outer rotary shaft or to the bending head by means of a screw connection of the connecting device. In particular, this screw connection is detachable and / or tightenable along the radial direction.

[0028] In a further embodiment of the invention, the bending head has a cavity in which the bending mandrel is rotatably mounted. The cavity can be open axially, at least towards the rotating mechanism. The cavity has at least one radially extended cavity region. The bending mandrel has at least one radial, in particular circumferential, mandrel projection. The mandrel projection is arranged within the radially extended cavity region, in particular with axial play limited on both sides by the bending head. As already mentioned, the axial play can in particular be a maximum of 0.1 mm.

[0029] In a further embodiment of the invention, the bending machine has a bearing housing for supporting the at least one rotatable rotary shaft. The bending machine also has a locking device, which is particularly operable manually. The locking device serves to lock the at least one rotatable rotary shaft relative to the bearing housing, particularly by positive locking. Such locking of the at least one rotatable rotary shaft can be advantageous when changing the tooling, especially to bring transmission structures for positive torque transmission into engagement relative to each other with respect to the circumferential direction. In particular, at least the outer rotary shaft is rotatable and can be locked relative to the bearing housing by means of the locking device.

[0030] Advantageously, the locking device features a radially adjustable locking bolt for positive engagement in a radial bore of the rotary shaft, particularly the outer one, which can be locked by means of the locking device. The locking bolt can be spring-loaded on the bearing housing to allow it to self-return.

[0031] A bending tool assembly according to the invention is configured for use in a bending machine according to the invention as described above. The bending head and the bending mandrel of the bending tool assembly each have an interaction section. The interaction sections of the bending head and the bending mandrel serve for, in particular, direct and / or coordinated, bending interaction with elongated material, especially in an NC-controlled bending process for the production of a bent part. The bending tool assembly is designed for detachable coupling to the rotary mechanism of the bending machine, so that in the coupled state the interaction sections point axially away from the rotary mechanism and so that elongated material can be fed between the interaction sections of the bending head and the bending mandrel for bending interaction, in particular radially. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Further advantages and aspects of the invention will become apparent from the claims and from the description of exemplary embodiments of the invention, which are explained below with reference to the figures. In this context, identical reference numerals refer to identical, similar, or functionally equivalent components.

[0033] It is understood that the features mentioned above and those to be explained below can be used not only in the combinations specified, but also in other combinations or on their own, without leaving the scope of the present invention. Fig. 1 shows a schematic perspective view of a detail of an embodiment of a bending machine according to the invention with a coupled bending tool device, Fig. 2 shows a schematic axial section view of the bending machine according to Fig. 1 , Fig. 3 in schematic perspective view a detail of the bending machine according to the Fig. 1 and 2without bending tool assembly, Fig. 4 in schematic perspective view separately the decoupled bending tool assembly of the bending machine according to the Fig. 1 and 2 , Fig. 5 in perspective axial section schematically the bending tool device according to Fig. 4 Fig. 6 shows a schematic perspective view of another embodiment of the bending machine according to the invention with a coupled bending tool device, Fig. 7 shows a schematic axial section view of the bending machine according to Fig. 6 , Fig. 8 in schematic perspective view the bending machine according to the Figs. 6 and 7 without bending tool assembly, Fig. 9 in schematic perspective view separately the decoupled bending tool assembly of the bending machine according to the Figs. 6 and 7Fig. 10 shows a schematic perspective view of another embodiment of the bending machine according to the invention with bending tool assembly in the decoupled state, and Fig. 11 shows a schematic perspective view of the bending machine according to Fig. 10 with attached bending tool device. DETAILED DESCRIPTION OF THE EXECUTION EXAMPLES

[0034] A bending machine 1 is designed for the production of bent parts from elongated material. This elongated material can be wire, tubing, strip, or the like. The bending machine 1 is configured to mass-produce a large number of identical bent parts from this elongated material using a computer numerically controlled manufacturing process.

[0035] Bending machine 1 has a rotary mechanism 2. The rotary mechanism 2 has a hollow outer rotary shaft 3. The rotary mechanism 2 also has an inner rotary shaft 4, which is coaxially nested within the outer rotary shaft 3. The inner rotary shaft 4 can be a solid shaft, i.e., solid and / or without cavities. The hollow outer rotary shaft 3 surrounds the inner rotary shaft 4. The outer rotary shaft 3 can surround the inner rotary shaft 3 like a shell. The inner rotary shaft 3 can be rotatably mounted directly on the outer rotary shaft 4.

[0036] At least one of the slewing shafts 3, 4 is rotatable about a geometric axis of rotation D of the slewing mechanism 2. In this case, the slewing shafts 3, 4 are rotatable independently of each other about the geometric axis of rotation D of the slewing mechanism 2. The slewing mechanism 2 has a first drive unit 9 by means of which the outer slewing shaft 3 can be driven in a controlled manner. In addition, the slewing mechanism 2 has a second drive unit 10 by means of which the inner slewing shaft 4 can be driven in a controlled manner. The drive units 9, 10 can each be connected to one of the slewing shafts 3, 4 by means of a gear unit 11 of the slewing mechanism 2.

[0037] The axis of rotation D of the rotary mechanism 2 runs parallel to an axial direction A of the bending machine 1. A radial direction R of the bending machine 1 runs orthogonal to the axial direction A. A circumferential direction C of the bending machine 1 runs within a virtual plane oriented perpendicular to the axial direction A.

[0038] The bending machine 1, for example, has a bearing housing 33 which serves to support the rotary shafts 3, 4. The bending machine 1 can, as in the present case, have a locking device 34 by means of which at least the outer rotary shaft 3 can be locked relative to the bearing housing 33, for example, positively and / or rotationally fixed with respect to the axis of rotation D. The locking device 34 can be manually actuated to lock and / or release the outer rotary shaft 3.

[0039] The locking device 34, for example, has a radially adjustable locking bolt 35 for positive engagement in a radial bore of the outer rotary shaft 3. The locking bolt 35 can be self-resetting and / or spring-loaded on the bearing housing 33.

[0040] The bending machine 1 has a bending tool assembly 5. The bending tool assembly 5 can be interchangeably coupled to the rotary unit 2 of the bending machine 1. The bending tool assembly 5 is therefore designed for detachable coupling to the rotary unit 2 of the bending machine 1. The bending tool assembly 5 is used for bending elongated material.

[0041] The bending tool assembly 5 has a bending head 7. The bending tool assembly 5 also has a bending mandrel 8. The bending mandrel 8 is coaxially nested within the bending head 7. The bending head 7 surrounds the bending mandrel 8, at least partially. The bending head 7, which receives the bending mandrel 8, and the bending mandrel 8, which is received by the bending head 7, are designed and / or arranged relative to each other for joint handling during a coupling and / or decoupling process. The bending mandrel 8 is captive and securely received by the bending head 7. In particular, the bending head 7 is hollow.

[0042] The bending head 7 and the bending mandrel 8 each have an interaction section 37. The interaction sections 37 serve for a bending interaction with elongated material in order to shape the elongated material for the production of a bent part. In particular, the interaction sections 37 are designed for direct and / or coordinated bending interaction with elongated material.

[0043] The bending machine 1 has a coupling device 6. The coupling device 6 is designed for the detachable coupling of the bending tool assembly 5 to the rotary drive 2. In a coupled state of the bending tool assembly 5, the bending head 7 is connected to the outer rotary drive shaft 3 and the bending mandrel 8 to the inner drive shaft 4, in particular in a torque-transmitting manner, such that the bending head 7 and the bending mandrel 8 are rotatably adjustable relative to each other about the axis of rotation D in conjunction with a rotational adjustment of the at least one rotatable rotary drive shaft 3, 4, in order to bend supplied elongated material.

[0044] For example, in the coupled state of the bending tool assembly 5, the bending head 7 is rotatable by means of the outer rotary shaft 3. Furthermore, in the coupled state of the bending tool assembly 5, the bending mandrel 8 is rotatable – independently of the bending head 7 and the outer rotary shaft 3 – by means of the inner rotary shaft 4. In the coupled state, the bending head 7 and the bending mandrel 8 are each independently adjustable about the axis of rotation D. By coordinating the adjustment of the bending mandrel 8 and the bending head 7 relative to each other, particularly depending on the control system, elongated material fed into the machine can be bent to produce a bent part.

[0045] The bending tool device 5 can be coupled to the rotary device 2 in such a way that, in the coupled state, the interaction sections 37 point axially away from the rotary device 2 and that elongated material for the bending interaction, in particular radially, can be fed between the interaction sections 37 of the bending head 7 and the bending mandrel 8.

[0046] The coupling device 6, for example, has complementary transmission structures 12, 12A, by means of which a torque about the axis of rotation D can be transmitted between the outer rotary shaft 3 and the bending head 7 in the coupled state. In this case, mutually facing axial end sections 13 of both the outer rotary shaft 3 and the bending head 7 have corresponding complementary transmission structures 12, 12A. The complementary transmission structures 12, 12A at the mutually facing axial end sections 13 of the outer rotary shaft 3 and the bending head 7 form, for example, a detachable, rotationally fixed axial plug connection between the outer rotary shaft 3 and the bending head 7.

[0047] Alternatively or additionally, the coupling device 6 – as in the present case – can have other complementary transmission structures 12, 12B, by means of which a torque about the axis of rotation D between the inner rotary shaft 4 and the bending mandrel 8 can be transmitted in the coupled state. The other complementary transmission structures 12, 12B are present on mutually facing axial end sections 13 of both the inner rotary shaft 4 and the bending mandrel 8. By means of the transmission structures 12, 12B formed on both the inner rotary shaft 4 and the bending mandrel 8, for example, another detachable, rotationally fixed axial plug connection between the inner rotary shaft 4 and the bending mandrel 8 is realized.

[0048] The axial plug connection of the inner rotary shaft 4 and the bending mandrel 8 as well as the axial plug connection of the outer rotary shaft 3 and the bending head 7 can be created and / or released together, in particular simultaneously.

[0049] The coupling device 6, for example, has a connecting device 14 for releasably axially holding the bending tool device 5 on the rotary unit 2. For example, the complementary transmission structures 12, 12A, 12B can be held in torque-transmitting engagement with each other by means of the connecting device 14.

[0050] For example, the bending head 7 has a cavity 30. The bending mandrel 8 is rotatably mounted in the cavity 30. In the coupled state, the cavity 30 can be open axially at least towards the rotary mechanism 2. The cavity 30 has, for example, at least one radially extended cavity region 31. The bending mandrel 8 has at least one radial, in particular circumferential, mandrel projection 32. The mandrel projection 32 can be arranged within the radially extended cavity region 31. In this case, the mandrel projection 32 is arranged within the radially extended cavity region 31 with axial play limited on both sides by the bending head 7.

[0051] For example, the bending head 7 has a first bending head component 24 and a second bending head component 25 that differs from the first bending head component 24. In the coupled state of the tool assembly 5, the first bending head component 24 points, for example, away from the rotary unit 2 along the axial direction A. The bending head components 24 and 25 are axially connected to one another, for example, detachably. In this case, the second bending head component 25 is arranged between the rotary unit 2 and the first bending head component 24 with respect to the axial direction A in the coupled state. The bending mandrel 8 is supported axially, in particular directly, between the first bending head component 24 and the second bending head component 25. For example, there is an axial clearance, in particular of a maximum of 0.1 mm, between the bending mandrel 8 and the bending head 7.

[0052] The radially expanded cavity area 31 can be partially limited by the first bending head component 24 and by the second bending head component 25. The radially expanded cavity area 31 can be axially separably limited by the bending head components 24 and 25.

[0053] The bending head 7, for example, has a recess 26, which is circumferential and / or radially recessed, particularly along the circumferential direction C. In this case, the recess 26 is open radially outwards. The circumferential recess 26 can be partially limited by the first bending head component 24 and by the second bending head component 25. The recess 26 can be axially separable by the bending head components 24 and 25.

[0054] According to the example of Figs. 1 to 5The connecting element 14 of the coupling device 6 has a radial projection 15, which in particular projects outwards. The radial projection 15 is formed, for example, at least partially, and in particular completely, circumferentially along the circumferential direction C. The connecting element 14 also has a cap nut 16 that engages the radial projection 15. Furthermore, the connecting element 14 has a threaded section 17 that is matched to the cap nut 16 and to the projection 15. The projection 15 is axially secured to the threaded section 17 by means of the cap nut 16. For example, the cap nut 16 is captive, at least partially, in the recess 26 of the bending head 7.

[0055] For example, the axial end section 13 of the bending head 7 facing the outer rotary shaft 3 has the radial projection 15. The cap nut 16 is supported, for example, by means of the axial end section 13 of the bending head 7 facing the outer rotary shaft 3, in a captive manner. The threaded section 17 of the connecting device 14 is formed by the axial end section 13 of the outer rotary shaft 3 facing the bending head 7. In embodiments not shown, conversely, the threaded section 17 can be attached to the bending head 7 and the radial projection 15 and the cap nut 16 to the outer rotary shaft 3.

[0056] According to the example of Figs. 10 and 11The connecting device 14 of the coupling device 6 can have a bayonet fitting 18 by means of which the bending tool device 5 can be axially secured to the rotary device 2. The bending head 7 can form a first locking part 19 of the bayonet fitting 18. The outer rotary device shaft 3 can have a second locking part 20 of the bayonet fitting 18, which is matched to the first locking part 19. The bending head 7 can integrally form the first locking part 19. The outer rotary device shaft 3 can integrally form the second locking part 20.

[0057] One of the locking parts 19, 20, for example, has a bayonet slot 22, whereas the other locking part 19, 20 has a radial bayonet projection 23 that is complementary to the bayonet slot 22. The bayonet slot 22 is designed, for example, to receive and guide the bayonet projection 23. For example, the connecting device 14 has a locking element 21 that is removable, in particular radially, from and / or out of the bayonet slot 22, by means of which the bayonet slot 22 is blocked in order to keep the bayonet locking device 18 in a closed state, cf. in particular Fig. 11 The closed state can correspond to the coupled state.

[0058] To hold the locking element 21 in the bayonet slot 22 in a blocking manner, a screw connection can be provided – as in the present case – by means of which the locking element 21 is detachably attached or attachable to at least one of the locking parts 19, 20. Alternatively or additionally to the screw connection, the locking element 21 blocking the bayonet slot 22 can be detachably attached or attachable to at least one of the locking parts 19, 20 by means of a snap connection and / or a locking connection.

[0059] According to the example below Figs. 6 to 9The opposing axial end sections 13 of both the outer rotary shaft 3 and the bending head 7 each have at least two, in this case exactly two, positive locking contour areas 27 on their outer circumference. The positive locking contour areas 27 of the bending head 7 can be diametrically opposed to each other. The positive locking contour areas 27 of the outer rotary shaft 3 can be diametrically opposed to each other. The connecting device 14 of the coupling device 6 has, for example, at least two clamps 28 which are designed to be complementary to the positive locking contour areas 27. In the coupled state, the clamps 28 can engage radially, for example in a clamp-like manner, in both one of the positive locking contour areas 27 of the outer rotary shaft 3 and one of the positive locking contour areas 27 of the bending head 7, see in particular Figs. 6 and 7. By such intervention, the bending tool device 5 can be held axially in a form-fitting manner on the rotary device 2.

[0060] The clamps 28 can each be detachably attached radially to the bending head 7 or – as in the present case – to the outer rotary shaft 3 by means of a screw connection 29 of the connecting device 14. In particular, the clamps 28 can be attached diametrically opposite each other.

Claims

1. Bending machine (1) for producing bent parts from elongated material, wherein the bending machine (1) comprises: - a rotary mechanism (2) which has a hollow outer rotary shaft (3) and an inner rotary shaft (4) nested coaxially in the outer rotary shaft (3), wherein at least one of the rotary shafts (3, 4) is rotatable about a rotation axis (D) of the rotary mechanism (2), - a bending tool assembly (5) for bending elongated material and a coupling device (6) for detachably coupling the bending tool assembly (5) to the rotary mechanism (2), - wherein the bending tool assembly (5) comprises a bending head (7) and a bending mandrel (8) nested coaxially in the bending head (7), wherein the bending mandrel (8) is received by the bending head (7) such thatthat the bending head (7) receiving the bending mandrel (8) and the bending mandrel (8) received by the bending head (7) are jointly operable for coupling the bending tool assembly (5) to the rotary mechanism (2) and / or for decoupling the bending tool assembly (5) from the rotary mechanism (2), wherein, in a coupled state of the bending tool assembly (5), the bending head (7) is connected to the outer rotary shaft (3) and the bending mandrel (8) is connected to the inner rotary shaft (4) in such a way that, by rotating the at least one rotatable rotary shaft (3, 4), the bending head (7) and the bending mandrel (8) are rotatable relative to each other about the axis of rotation (D) in order to bend supplied elongated material.

2. Bending machine according to claim 1, characterized by the fact that- the rotary shafts (3, 4) are independently rotatable about the axis of rotation (D) of the rotary mechanism (2), - wherein in the coupled state of the bending tool device (5) the bending head (7) by means of the outer rotary shaft (4) and the bending mandrel (8) by means of the inner rotary shaft (4) are each rotatable about the axis of rotation (D) and independently of each other in order to bend supplied elongated material, - in particular wherein the outer rotary shaft (3) is designed as the outer drive shaft of the rotary mechanism (2) and the inner rotary shaft (4) is designed as the inner drive shaft of the rotary mechanism (2).

3. Bending machine (1) according to claim 1 or 2, characterized by the fact that - the bending mandrel (8) is captively received by the bending head (7).

4. Bending machine (1) according to one of claims 1 to 3, characterized by the fact that- the coupling device (6) has complementary transmission structures (12, 12A) for positive-locking torque transmission in the coupled state, wherein the complementary transmission structures (12, 12A) are present on mutually facing axial end sections (13) of both the outer rotary shaft (3) and the bending head (7), in particular to form a detachable, rotationally fixed axial plug connection between the outer rotary shaft (3) and the bending head (7), and / or that - the coupling device (6) has (other) complementary transmission structures (12, 12B) for positive-locking torque transmission in the coupled state, wherein the (other) complementary transmission structures (12, 12B) are present on mutually facing axial end sections (13) of both the inner rotary shaft (4) and the bending mandrel (8), in particular to form a (other) detachable, rotationally fixed to form an axial plug connection between the inner rotary shaft (4) and the bending mandrel (8).

5. Bending machine (1) according to one of the preceding claims, characterized by the fact that - the coupling device (6) has a connecting device (14) for releasably axially holding the bending tool device (5) on the rotary device (2).

6. Bending machine (1) according to one of the preceding claims, characterized by the fact that - a connecting device (14) of the coupling device (6) has a radial, in particular circumferential, projection (15) and a union nut (16) encompassing the radial projection (15) and a threaded section (17) adapted to the union nut (16) and the projection (15) in such a way that the radial projection (15) is axially secured to the threaded section (17) by means of the union nut (16).

7. Bending machine (1) according to claim 6, characterized by the fact that- an axial end section (13) of the bending head (7) facing the outer rotary shaft (3) has the radial projection (15) and carries the cap nut (16), in particular captive, - wherein an axial end section (13) of the outer rotary shaft (3) facing the bending head (7) has the threaded section (17).

8. Bending machine (1) according to one of the preceding claims, characterized by the fact that - a connecting device (14) of the coupling device (6) forms a bayonet lock (18) for releasably axially holding the bending tool device (5) on the rotary device (2), - in particular wherein the bending head (7) has a first locking part (19) of the bayonet lock (18) and the outer rotary device shaft (3) has a second locking part (20) of the bayonet lock (18) matched to the first locking part (19), in particular each integrally.

9. Bending machine (1) according to one of the preceding claims, characterized by the fact that- the bending head (7) has a first bending head component (24) which points axially away from the rotary device (2) in the coupled state and a second bending head component (25) which is different from the first bending head component (24), wherein the bending head components (24, 25) are axially attached to one another, in particular detachably, - wherein the bending mandrel (8) is axially, in particular directly, supported between the first bending head component (24) and the second bending head component (25), in particular with an axial clearance.

10. Bending machine (1) according to one of the preceding claims, characterized by the fact that- a first bending head component (24) of the bending head (7) and a second bending head component (25) of the bending head (7) each partially define a recess (26) of the bending head (7), in particular circumferential on the outside, in particular axially separable, - wherein a cap nut (16), in particular of a connecting device (14), of the coupling device (6) is at least partially received in the recess (26) of the bending head (7).

11. Bending machine (1) according to one of the preceding claims, characterized by the fact that- mutually facing axial end sections (13) of both the outer rotary shaft (3) and the bending head (7) each have at least two, in particular diametrically opposed, positive locking contour areas (27) on their outer circumference, and - a connecting device (14) of the coupling device (6) has at least two claws (28) which are designed complementary to the positive locking contour areas (27) and which, in the coupled state, in particular clamp-like, engage radially in both one of the positive locking contour areas (27) of the outer rotary shaft (3) and in one of the positive locking contour areas (27) of the bending head (7) in order to hold the bending tool device (5) axially positively on the rotary device (2).

12. Bending machine (1) according to claim 11, - wherein the jaws (28), in particular diametrically opposite each other, are each detachably attached radially to the outer rotary shaft (3) or to the bending head (7) by means of a screw connection (29) of the connecting device (14).

13. Bending machine (1) according to one of the preceding claims, characterized by the fact that - the bending head (7) has a cavity (30) which rotatably receives the bending mandrel (8) and which is open axially at least towards the rotary mechanism (2), - wherein the cavity (30) has at least one radially extended cavity area (31), - wherein the bending mandrel (8) has at least one radial, in particular circumferential, mandrel projection (32), - wherein the mandrel projection (32) is arranged within the radially extended cavity area (31), in particular with an axial clearance limited on both sides by means of the bending head (7).

14. Bending machine (1) according to one of the preceding claims, characterized by the fact that - the bending machine (1) has a bearing housing (33) for supporting the at least one rotatable rotary shaft (3, 4), - wherein the bending machine (1) has a locking device (34), in particular manually operable, for locking at least one rotatable rotary shaft (3, 4) relative to the bearing housing (33), in particular positive locking, - in particular wherein at least the outer rotary shaft (3) is rotatable and can be locked relative to the bearing housing (33) by means of the locking device (34).

15. Bending tool device (5) for a bending machine (1) according to one of the preceding claims, - wherein the bending head (7) and the bending mandrel (8) each have an interaction section (37) for, in particular, direct and / or coordinated, bending interaction with elongated material, and - wherein the bending tool device (5) is designed for detachable coupling to the rotary mechanism (2) of the bending machine (1), so that in the coupled state the interaction sections (37) point axially away from the rotary mechanism (2) and so that elongated material can be fed for the bending interaction, in particular radially, between the interaction sections (37) of the bending head (7) and the bending mandrel (8).

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