Machining center for processing long, slender metal workpieces

Abstract

A machining center (1) for processing an elongated metal workpiece (2), particularly a machining center (1) for manufacturing drive elements, particularly drive elements for drill strings, A support device (3) that supports the elongated metal workpiece (2) to be processed, A first milling unit (5) that can operate with at least one degree of freedom relative to the workpiece (2) supported by the mounting device (3), A second milling unit (6) that can operate with at least one degree of freedom relative to the workpiece (2) to be processed, which is supported by the mounting device (3), The system includes a control device (8) configured to control the operation of the first milling unit (5) with at least one degree of freedom of movement in or within the first processing area (B1) of the workpiece (2) assigned to the first milling unit (5), and to control the operation of the second milling unit (6) with at least one degree of freedom of movement in or within the second processing area (B2) of the workpiece (2).

Description

Technical Field

[0001] The present invention relates to a machining center for machining an elongated metal workpiece, particularly a machining center for manufacturing drive elements, particularly drive elements for drill strings, which includes a mounting device for mounting the elongated metal workpiece to be machined.

Background Art

[0002] Machining centers for machining elongated metal workpieces, particularly machining centers for manufacturing drive elements, particularly drive elements for drill strings, have been generally known in various embodiments. Conventionally, a milling unit that is operable with at least one degree of freedom with respect to a workpiece supported by a mounting device is provided, and machining of the elongated metal workpiece is performed.

[0003] Such workpieces may have a length exceeding 5 m, and there are problems with machining efficiency.

[0004] [[ID=I9]] Known machining centers enable reliable machining of such elongated metal workpieces, but there is always a need for improvement and further development in terms of their efficiency and machining speed.

[0005] Therefore, there is a need for a machining center that enables reliable machining of elongated metal workpieces while improving efficiency and machining speed.

Summary of the Invention

Problems to be Solved by the Invention

[0006] Based on the above background, an object of the present invention is to provide an improved machining center for machining an elongated metal workpiece, particularly for manufacturing drive elements for drill strings.

Means for Solving the Problems

[0007] This objective is achieved by a machining center, according to the independent claim, for machining elongated metal workpieces, particularly for manufacturing drive elements for drill strings. The subject matter of the dependent claim relates to possible embodiments of the machining center described in independent claim 1.

[0008] A first aspect of the present invention relates to a machining center for machining elongated metal workpieces. The machining center is thus configured, in general terms, for machining elongated metal workpieces. Machining of elongated metal workpieces achievable by the machining center can be used, in particular, for the manufacture of drive elements, especially drive elements for drill strings. Therefore, the machining center can be configured to machine elongated metal workpieces, particularly for the purpose of manufacturing drive elements having a rotor shape, especially drive elements for drill strings. Thus, the workpieces may have a cylindrical or basic shape. Hereinafter, when referring to a workpiece, it means an elongated metal workpiece that can be machined using a machining center.

[0009] A machining center is equipped with a mounting device for attaching a workpiece. The mounting device is configured to rotatably mount the workpiece, and therefore the mounting device is configured to support the workpiece so that it can rotate around its longitudinal axis. For this purpose, the mounting device may be equipped with one or more drive devices capable of rotating the supported workpiece around its longitudinal axis. The rotatable support of the workpiece enables complete machining of the outer circumference of the workpiece.

[0010] A mounting device is formed by one or more mounting units or may comprise one or more mounting units. Typically, a mounting device comprises a first mounting unit configured to mount a first section of a workpiece, in particular a first free end, and a second mounting unit configured to mount a second section of the workpiece, in particular a second free end. Each mounting unit is designed, for example, as a clamp and / or tension unit, or comprises such a unit, and is configured to grip or pull the workpiece, i.e., each first and second section of the workpiece. Specific examples of the corresponding mounting units are, but are not limited to, chucks, tailstocks, etc.

[0011] Regardless of the specific design, each mounting unit is mounted so as to be movable with respect to one degree of freedom relative to each other, for example, in the translational direction, particularly along the machining axis or machine axis of the machining center. Thus, since at least one mounting unit is movably mounted relative to other mounting units, the mounting device can be configured to support workpieces of different lengths. For this purpose, the mounting device may include one or more drive units, and at least one mounting unit can operate relative to other mounting units, particularly along the machining axis or machine axis of the machining center. Specifically, each mounting unit may be movably positioned or formed on, for example, the machine bed of a machining center.

[0012] The main point to note here is that this mounting device can, in principle, be configured to accommodate workpieces of 5m or more in length, especially 7.5m or more, and even more particularly 10m or more. Therefore, this machining center can be configured to process workpieces of 5m or more in length, especially 7.5m or more, and even more particularly 10m or more.

[0013] A machining center also includes a first milling unit that operates with respect to a workpiece held by a mounting device, with at least one degree of freedom, i.e., primarily a translational degree of freedom and / or a rotational degree of freedom. The first milling unit typically comprises a housing structure, a milling tool located on or within the housing structure and rotatable about a tool axis, and a (motor) drive unit located on or within the housing structure and associated with the milling tool, the drive unit being configured to generate and transmit a driving force to rotate the milling tool. Specifically, the first milling unit may be designed, for example, as a milling head, comprising a corresponding housing structure and at least one milling tool located on or within the housing structure.

[0014] The housing structure of the first milling unit is, for example, directly or indirectly positioned on a sliding support structure, the support structure being capable of translational movement along the machining axis or machine axis of the machining center. The support structure is configured to support the first milling unit or the corresponding milling head with at least one degree of freedom of rotation around a pivot axis oriented, for example, parallel or perpendicular to the machining axis or machine axis of the machining center, and may be equipped with one or more drive devices for this purpose. The support structure may be equipped with one or more support elements configured to support a workpiece. At least one support element is driven by one or more drive devices to move toward the workpiece, for example, radially with respect to the longitudinal axis of the workpiece, thereby supporting the workpiece in the area of ​​the support structure, i.e., the machining area by the first milling unit. Furthermore, at least one corresponding support element is arranged or formed on the housing structure of the first milling unit, and at least one support element, or at least one support element alone, is operably attached to the housing structure. Therefore, the support element is operable with respect to the workpiece and can support the workpiece in the area of ​​the support structure, i.e., the area processed by the first milling unit.

[0015] To operate a first milling unit on a workpiece supported by a mounting device, the machining center is equipped with at least one (motor) drive unit assigned to the first milling unit, the drive unit being configured to generate a driving force to operate the first milling unit on the workpiece supported by the mounting device, and a driving force to operate the first milling unit on the workpiece supported by the mounting device. The (motor) drive unit associated with the first milling unit is configured to generate a driving force to operate the first milling unit by its movement on the workpiece supported by the mounting device, and to transmit the driving force to the first milling unit. The movement of the first milling unit is particularly a translational movement along a translational axis that may coincide with or be parallel to the machining axis or machine axis of the machining center. Furthermore, translational movement of the first milling unit on the workpiece or translational movement of the workpiece is possible.

[0016] In addition to the degree of freedom of translational movement along the translation axis relative to the workpiece supported by the mounting device, the first milling unit can be supported so as to be operable with respect to the workpiece supported by the mounting device with respect to at least one further degree of freedom. The further translational degree of freedom of the first milling unit is, for example, the degree of freedom of rotational movement about a rotation axis parallel and / or perpendicular to the machining axis or machine axis of the machining center. Thus, the first milling unit is operable with respect to the workpiece mounted by the mounting device with respect to at least one translational degree of freedom and at least one rotational degree of freedom. This allows the first milling unit to perform complex machining operations and introduce complex shapes into the workpiece.

[0017] A machining center further includes a second milling unit that is operable with respect to a workpiece supported by a mounting device, with at least one degree of freedom that is essentially a translational degree of freedom and / or a rotational degree of freedom. The second milling unit typically comprises a housing structure, a milling tool located on or within the housing structure and rotatable about a tool axis, and a (motor) drive unit located on or within the housing structure and associated with the milling tool, the drive unit being configured to generate and transmit a driving force to rotate the milling tool. Specifically, the second milling unit may be designed, for example, as a milling head, comprising a corresponding housing structure and at least one milling tool located on or within the housing structure.

[0018] The corresponding housing structure of the second milling unit may be positioned directly or indirectly on a support structure, for example, a sliding support structure, which is capable of translational movement along the machining axis or machine axis of the machining center. The support structure is configured to support the second milling unit or the corresponding milling head so that it can pivot with at least one degree of freedom about a rotation axis parallel to or perpendicular to the machining axis or machine axis of the machining center, and may be provided with one or more drive devices for this purpose. The support structure may further include one or more support elements configured to support a workpiece. At least one support element may be driven by one or more drive devices for this purpose, for example, radially with respect to the longitudinal axis of the workpiece, so that the support element can support the workpiece in the area of ​​the support structure, i.e., the area of ​​machining by the second milling unit. At least one corresponding support element is also positioned or formed on the housing structure of the second milling unit, and the housing structure is operably mounted to the housing structure, either together with or by the at least one support element, and is operable with respect to the workpiece, and the support element is considered to support the workpiece in the area of ​​the support structure, i.e., the area of ​​processing by the first milling unit.

[0019] To operate the second milling unit relative to a workpiece or a workpiece supported by a mounting device, the machining center is equipped with at least one (motor) drive unit assigned to the second milling unit, the drive unit being configured to generate a driving force to operate the second milling unit relative to the workpiece supported by the mounting device, and a driving force to operate the second milling unit relative to the workpiece supported by the mounting device. The (motor) drive unit associated with the second milling unit is configured to generate a driving force to operate the second milling unit relative to the workpiece supported by the mounting device and to transmit this driving force to the second milling unit. The operation of the second milling unit is particularly a translational operation along a translational axis that may coincide with or be parallel to the machining axis or machine axis of the machining center. Furthermore, translational operation of the second milling unit relative to the workpiece or translational operation of the workpiece is possible.

[0020] In addition to the degree of freedom of translational movement along the translation axis, the second milling unit can be supported by the mounting device so as to be operable with respect to the workpiece supported by the mounting device with respect to the workpiece supported by the mounting device, with respect to the workpiece supported by the mounting device. The additional degrees of freedom of movement of the second milling unit are, for example, degrees of freedom of rotational movement around a rotation axis parallel to and / or perpendicular to the machining axis or machine axis of the machining center. Thus, the second milling unit can be operated with respect to the workpiece supported by the mounting device with respect to at least one translational degree of freedom and at least one rotational or rotational degree of freedom. This allows the second milling unit to perform complex machining operations and introduce complex shapes into the workpiece.

[0021] Typically, each milling unit is mounted to be operable with one translational degree of freedom along the machining axis or machine axis of the machining center, and to be rotatable with one or more rotational degrees of freedom around a pivot axis parallel and / or perpendicular to the machining axis or machine axis of the machining center. The translational and / or rotational motion of the milling unit is typically coordinated or synchronized with the rotational motion of the workpiece around its longitudinal axis.

[0022] The machining center further includes a control system implemented in hardware and / or software, which is used to control the movement of at least one degree of freedom of a first milling unit within or within a first machining area assigned to a first milling unit of a workpiece supported by a mounting device, and to control the movement of at least one degree of freedom of a second milling unit within or within a second machining area assigned to a second milling unit of a workpiece supported by a mounting device. Each machining area typically includes at least one machining path formed by a start point and an end point, and each milling unit moves or may move within that machining path during machining of each machining area. Each machining area typically corresponds to an area or sub-area of ​​a workpiece to be machined by the machining center. Thus, each machining area typically represents a common area of ​​each workpiece to be machined by the machining center.

[0023] Each milling unit is typically assigned at least one machining area, and each milling unit must machine its assigned area. Therefore, by providing at least two milling units, the workpiece can be machined in different areas (corresponding to the machining areas of each milling unit), particularly simultaneously. This significantly improves the machining efficiency of the machining center compared to a machining center with only one milling unit.

[0024] The control device is also typically configured to form or generate each machining area and assign them to milling units. Thus, the control device can be configured to define machining operations on a workpiece by generating or forming and assigning machining areas in the sense of a machining work plan, and can even be adapted during the operation of the machining center as needed, as will be described later. Specifically, the control device may be configured, for example, to assign a first machining area of ​​the workpiece to a first milling unit and a second machining area of ​​the workpiece to a second milling unit.

[0025] In this case, the control device can take into account one or more input parameters. Therefore, the control device can be configured to generate each machining area based on at least one input parameter and allocate each machining area to the milling unit. The corresponding input parameters are, for example, geometric and structural parameters such as the dimensions and shape of the workpiece to be machined, geometric and structural parameters such as the dimensions and shape of the machined workpiece, material parameters of the workpiece such as hardness and machinability, parameters of the milling unit such as power consumption, or parameters of the milling tool such as the type of milling tool, the shape of the milling tool, and the hardness of the milling tool, but are not limited thereto.

[0026] The operation control of the first milling unit in the first machining area of the workpiece assigned to the first milling unit or within the range of the first machining area, and the operation control of the second milling unit in the second machining area of the workpiece assigned to the second milling unit or within the range of the second machining area can be achieved by the control device, and further includes the control of one or more operation parameters such as power consumption, and the control of the operation parameters of each milling unit for machining the workpiece in each machining area.

[0027] The control device is assigned a user interface implemented by hardware and / or software. The user can make control-related inputs through the user interface, and in particular, can use the user interface to make inputs related to the planning and / or adjustment of the machining operation. Based on this, the control device determines the machining operation for the workpiece by correspondingly generating or defining and allocating the machining area in the sense of the machining operation plan, and even adjusts it during the operation of the machining center if necessary.

[0028] Overall, this provides an improved machining center for machining workpieces.

[0029] The control device can be configured to control the operation of the first milling unit with at least one degree of freedom, depending on or independently of the operation of the second milling unit with at least one degree of freedom, or the second and the first milling units can be reversed as described above. Therefore, the operation of the first milling unit with at least one degree of freedom is controlled depending on, that is, taking into account the operation of the second milling unit with at least one degree of freedom (or the first and the second milling units are reversed as described above), whereby the milling units operate at a desired distance from each other, for example, to avoid a situation where the machining of the workpiece by the first milling unit in the first machining area (or the second machining area) adversely affects the machining of the workpiece in the second machining area (or the first machining area). A modification that is technically easy to implement is a method of controlling the operation of the first milling unit with at least one degree of freedom independently of the operation of the second milling unit with at least one degree of freedom, which means that each milling unit operates independently of each other within the range of each machining area.

[0030] As described above, the control device can be configured to assign the first machining area of the workpiece to the first milling unit and the second machining area to the second milling unit. This also includes that the control device assigns the machining, that is, the complete machining of the first machining area of the workpiece assigned to the first milling unit, to the first milling unit, and assigns the machining, that is, the complete machining of the second machining area of the workpiece assigned to the second milling unit, to the second milling unit.

[0031] As described above, each machining region typically includes at least one machining path determined by a start point and an end point. Each start point or end point may be located, for example, in or within the circumferential region of the workpiece with respect to its longitudinal axis, or within the scope of the workpiece. Therefore, for example, using a first milling unit, machining of the workpiece can be performed starting from a first circumferential region of the workpiece, such as the first free end of the workpiece, and then, during machining of the workpiece, the first milling unit can be operated, for example, starting from the end region having the start point of the first machining region and moving towards the end point. The end point of the first machining region then shifts towards the second free end of the workpiece ("machining from outside to inside"). However, the reverse procedure ("machining from inside to outside") is also possible. Similarly, using a second milling unit, machining can be started from a second end region of the workpiece, such as the second free end of the workpiece, and therefore the second milling unit can operate, for example, from the end region having the start point of the second machining region towards the end point during machining of the workpiece. Therefore, the endpoint of the second machining region shifts towards the first free end of the workpiece ("machining from the outside to the inside"). In this case, the reverse procedure ("machining from the inside to the outside") is also possible.

[0032] Alternatively, or in addition, the start or end point of at least one machining region may be spaced apart from the end region relative to the longitudinal axis of the workpiece or within the workpiece. Thus, a variation is conceivable in which a milling unit (only) machines the end region of the workpiece to form, for example, a specific interface, and another milling unit machines the remaining (internal) region of the workpiece to form, for example, a functional shape necessary for the intended function of the machined workpiece.

[0033] A variation is also conceivable in which multiple separate machining areas are assigned to at least one milling unit. Thus, the control device may be configured to assign multiple separate machining areas to at least one milling unit.

[0034] As a general rule, the first and second processing areas can overlap or not overlap in at least part of the same area (axially with respect to the longitudinal axis of the workpiece). In the first modified example, the start and / or end points of the first processing area are located within the second processing area (or the first and second processing areas are located in the opposite direction), creating an overlapping area where both milling units can process the workpiece. This is useful, for example, when processing an (unprocessed) workpiece for the first time, where initial processing of the workpiece is performed by only one milling unit in an area that can be designated as an initial area, and then the other milling unit begins processing the workpiece in or within the area that was initially processed (initial area). Therefore, the processing areas assigned to each milling unit can overlap in at least one area of ​​the workpiece that includes the corresponding initial area. In the second modified example, the start and / or end points of the first machining region are located outside the second machining region (or the first and second machining regions are in the opposite position), so that control-related means, particularly safety-related means, which are necessary to avoid undesirable proximity or collision between milling units, can be provided at all or only in small quantities.

[0035] It has already been shown that the control device may be configured to adjust or modify the first and / or second machining areas. Thus, the machining area initially assigned to each milling unit can be modified, i.e., enlarged or reduced. The machining area initially assigned to at least one milling unit may be enlarged or reduced by the control device. Thus, the control device may be configured to modify the assignment of the first milling unit to the first machining area, thereby enabling or assigning the first milling unit to, at least partially, also the second machining area. Alternatively or additionally, the control device may be configured to modify the assignment of the second milling unit to the second machining area, thereby enabling or assigning the second milling unit to, at least partially, also the first machining area.

[0036] Each machining area can be adjusted or modified in a particularly dynamic manner. This adjustment or modification can be performed especially during machining of the workpiece, i.e., while the milling unit is in operation.

[0037] Adjusting or changing each machining area provides greater flexibility in machining the workpiece, for example, by creating the possibility of working in at least one area of ​​the workpiece that was not initially assigned to a milling unit. This allows for, for example, consideration of machining delays by other milling units. Therefore, the possibility of adjusting the first and / or second machining areas can also have a positive impact on the efficiency of the machining center.

[0038] A machining center may include a monitoring device configured to monitor the operation of a first milling unit and / or a second milling unit and to generate monitoring information indicating the operation of the first milling unit and / or the second milling unit. Monitoring the operation of the first milling unit and / or the second milling unit also includes monitoring the machining results and / or machining progress of each milling unit, and generating information indicating each machining result and / or machining progress, which may be included in the monitoring information.

[0039] The monitoring device may be designed as an optical monitoring device, such as an image or video recording device, or may include at least such a device. Alternatively or additionally, other monitoring devices, such as an acoustic monitoring device, can also be considered, since information regarding the operation of the first and / or second milling units can be derived from the monitored acoustic signals.

[0040] The control device may be configured to adjust or change each processing area and / or the assignment of each processing area based on monitoring information. As a result, each processing area can be adjusted or changed considering the operation of each milling unit or the processing results and / or processing progress of each milling unit, thereby enabling extremely efficient processing of the workpiece.

[0041] As described above, a milling unit is typically operable relative to a workpiece with at least one translational degree of freedom. The operation of each milling unit with respect to the workpiece with respect to the translational degree of freedom can be achieved via at least one guide device, in particular at least one linear guide device. The at least one guide device may extend along the machining axis or machine axis of the machining center. The at least one guide device includes one or more guide elements, in particular linear guide elements such as guide rails, which are configured to interact with each milling unit to form a guide capable of translational movement. In particular, corresponding guide elements may be configured to interact with corresponding opposing guide elements on the side of each milling unit, for example, mechanically, i.e., in particular by shape fitting and / or press fitting. If the milling unit is arranged, for example, on one associated support structure of a sliding type, as described above, the corresponding guide elements may be configured to interact with corresponding opposing guide elements of the corresponding support structure, for example mechanically, i.e., in particular by shape fitting and / or press fitting.

[0042] One possibility is that the first and second milling units are guided together via a common guide device, which simplifies the machining center design by requiring only one (single) guide device. Alternatively, each milling unit could be guided via its own guide device.

[0043] A machining center may be equipped with a support device configured to support a workpiece being machined by the machining center at one or more support points along its longitudinal axis. This can avoid or at least reduce undesirable deflection of the workpiece, which may adversely affect the machining of the workpiece by the milling unit. The support device comprises one or more support elements, each of which is movably mounted between at least one operating position in which the workpiece being machined by the machining center can be supported at a support point, and at least one non-operating position in which the workpiece being machined by the machining center cannot be supported at one or more support points.

[0044] In all embodiments, the first and second milling units may be identical in design, thereby ensuring that the machining operations performed (or that can be performed) by the first milling unit are no different from those performed (or that can be performed) by the second milling unit (and vice versa). However, it is also conceivable that the first and second milling units are not identical, in which case the machining operations performed (or that can be performed) by the first milling unit will be different from those performed (or that can be performed) by the second milling unit (and vice versa). For example, the first milling unit may enable machining with a geometrically unformed cutting edge, while the second milling unit may enable machining with a geometrically formed cutting edge. More specifically, the first milling unit may enable, for example, rough machining of a workpiece, while the second milling unit may not enable rough machining but instead enable, for example, finish machining.

[0045] Furthermore, in all embodiments, the functional units of individual, multiple, or all machining centers, i.e., in particular, mounting devices (if any) with each mounting unit, milling units, monitoring devices (if any), guiding devices (if any), and support devices (if any), may be located in or formed in the machine housing of the machining center, which forms a higher housing structure. The machine bed of the machining center may also be located in or formed in the machine housing of the machining center.

[0046] A second aspect of the present invention relates to a method for machining an elongated metal workpiece, and more particularly to a method for manufacturing a drive element, and more particularly to a drive element for a drill string. The method includes the steps of: supporting an elongated metal workpiece to be machined by a machining center; operating a first milling unit with respect to the supported workpiece with at least one degree of freedom, and machining the workpiece with the first milling unit in at least one first machining area assigned to the first milling unit; and operating a second milling unit with respect to the supported workpiece with at least one degree of freedom, and machining the workpiece with the second milling unit in at least one second machining area assigned to the second milling unit. Furthermore, the method includes the steps of: controlling the operation of the first milling unit with at least one degree of freedom in or within the first machining area of ​​the workpiece assigned to the first milling unit; and controlling the operation of the second milling unit with at least one degree of freedom in or within the second machining area of ​​the workpiece assigned to the second milling unit.

[0047] This method can be implemented using a machining center according to the first aspect of the present invention, and therefore all embodiments relating to the machining center of the first aspect of the present invention are similarly applicable to the method of the second aspect of the present invention (and similarly applicable to the second aspect relating to the first aspect).

[0048] The present invention will be described again with reference to the illustrated embodiment. The figure is as follows. [Brief explanation of the drawing]

[0049] [Figure 1] Schematic diagram of a machining center according to one embodiment [Figure 2] Schematic diagram of a machining center according to one embodiment [Figure 3] Schematic diagram of a machining center according to one embodiment [Modes for carrying out the invention]

[0050] Figures 1 to 3 show schematic diagrams of a machining center 1 according to one embodiment, with Figures 1 and 3 showing front views and Figure 2 showing a view rotated 90° from Figures 1 and 3.

[0051] The machining center 1 is configured for machining elongated metal workpieces 2 having a cylindrical or basic shape. The machining of workpieces 2 that can be performed by the machining center 1 can be used in particular to manufacture, for example, rotor-shaped drive elements, especially drive elements for drill strings. Thus, the machining center 1 can be configured to machine the corresponding workpieces 2 in particular to manufacture, for example, rotor-shaped drive elements, especially drive elements for drill strings.

[0052] The machining center 1 includes a mounting device 3 for attaching a workpiece 2. The mounting device 3 may be configured to mount the workpiece 2 so that it can rotate around its longitudinal axis. For this purpose, the mounting device 3 includes one or more drive devices so that the supported workpiece 2 can rotate around its longitudinal axis.

[0053] The mounting device 3 is formed by one or more mounting units 3.1, or may comprise one or more mounting units 3.1. In this embodiment, the mounting device 3 comprises a first mounting unit 3.1 for mounting a first section of the workpiece 2, particularly the first free end, and a second mounting unit 3.1 for mounting a second section of the workpiece 2, particularly the second free end. Each mounting unit 3.1 is designed, for example, as a clamp and / or tension unit, or comprises a unit configured to grip or tension-support the workpiece 2, i.e., each first and second section of the workpiece 2. Specific examples of the corresponding mounting units 3.1 include, but are not limited to, chucks, tailstocks, etc.

[0054] As shown by the double arrow P1, each mounting unit 3.1, regardless of its specific design, is mounted along the machining axis or machine axis A1 of the machining center 1 so as to be movable with respect to each other in translational degrees of freedom. Thus, at least one mounting unit 3.1 can be mounted so as to be movable relative to other mounting units 3.1, and the mounting device 3 can be configured to support workpieces 2 of various lengths. For this purpose, the mounting device 3 comprises one or more drive units, through which at least one mounting unit 3.1 can be moved along the machining axis or machine axis A1 relative to another mounting unit 3.1. Specifically, each mounting unit 3.1 can be movably positioned or formed, for example, on or within the machine bed 4 of the machining center 1.

[0055] The mounting device 3 may be configured to support a workpiece 2 with a length of 5 m or more, particularly 7.5 m or more, and even more particularly 10 m or more. Therefore, the machining center 1 may be configured to machine a workpiece 2 with a length of 5 m or more, particularly 7.5 m or more, and even more particularly 10 m or more.

[0056] The machining center 1 further includes a first milling unit 5 that is operable with respect to a workpiece 2 held by a mounting device 3, with at least one degree of freedom, primarily translational and / or rotational. The first milling unit 5 typically comprises a housing structure 5.1, a milling tool 5.2 located on or on the housing structure 5.1 and rotatable about a tool axis A2 (see Figure 2) located on or on the housing structure 5.1, and a drive unit associated with the milling tool 5.2, the drive unit being configured to generate and transmit a driving force to rotate the milling tool 5.2. Specifically, the first milling unit 5 may be designed as a milling head comprising a corresponding housing structure 5.1 and at least one milling tool 5.2 located on the housing structure 5.1.

[0057] In relation to Figure 2, as indicated by the double arrow, the first milling unit 5 is typically capable of translational movement relative to the workpiece 2, for example, along axis A2, and the second milling unit 6 is typically similar; therefore, the second milling unit 6 is also mounted to be capable of movement with translational degrees of freedom.

[0058] The housing structure 5.1 of the first milling unit 5 can be directly or indirectly mounted on a support structure 11, such as a sliding type, and this support structure 11 is linearly movable along the machining axis or machine axis A1. As shown by the double arrows P2 and P3, the support structure 11 is configured to mount the first milling unit 5 so as to be rotatable with at least one rotational degree of freedom around a rotation axis parallel or perpendicular to the machining axis or machine axis A1, and may be equipped with one or more drive devices for this purpose. In particular, the translational degree of freedom shown by the double arrow P3 is arbitrary. As shown in Figure 2, the support structure 11 may be equipped with one or more support elements 11.1 configured to support the workpiece 2. At least one support element 11.1 is movable relative to the workpiece 2, for example radially with respect to the longitudinal axis of the workpiece 2, via one or more drive devices, thereby supporting the workpiece 2 in the area of ​​the support structure 11, and therefore in the machining area of ​​the first milling unit 5. Furthermore, at least one corresponding support element 11.1 is arranged or formed on the housing structure 5.1 of the first milling unit 5, and the housing structure 5.1 is movably mounted to the housing structure 5.1 together with or by at least one support element 11.1, thereby allowing the support element 11.1 to move relative to the workpiece 2 and support the workpiece 2 in the area of ​​the support structure 11, and therefore in the area of ​​processing by the first milling unit 5.

[0059] To operate the first milling unit 5 relative to the workpiece 2 mounted by the mounting device 3, the machining center 1 is equipped with at least one drive unit assigned to the first milling unit 5, the drive unit being configured to generate a driving force that moves the first milling unit 5 relative to the workpiece 2 supported by the mounting device 3, and to transmit the driving force to the first milling unit 5. This movement of the first milling unit 5 is a translational movement along a translation axis, indicated by a double arrow P4, which coincides with or is parallel to the machining axis or machine axis A1.

[0060] In this embodiment, in addition to the translational degrees of freedom relative to the workpiece 2 supported by the mounting device 3, the first milling unit 5 can, in principle, operate with two degrees of freedom of rotational movement, indicated by the double arrows P2 and P3, centered on a pivot axis parallel to the machining axis or machine axis A1 and a pivot axis perpendicular to the machining axis or machine axis A1. Therefore, in this embodiment, the first milling unit 5 can operate with respect to the workpiece 2 supported by the mounting device 3 with one translational degree of freedom and two degrees of freedom of rotation or rotational movement. This allows the first milling unit 5 to perform complex machining operations and introduce complex shapes into the workpiece 2.

[0061] The machining center 1 further includes a second milling unit 6 that is capable of operating with at least one degree of freedom, basically translational and / or rotational, relative to a workpiece 2 supported by a mounting device 3. The second milling unit 6 typically comprises a housing structure 6.1, a milling tool 6 disposed on the housing structure 6.1 and rotatable about a tool axis 2, and a drive unit either on the housing structure 6.1 or disposed on the housing structure 6.1 and associated with the milling tool 6.2, wherein the drive unit is configured to generate a driving force to rotate the milling tool 6.2 and to transmit the driving force to the milling tool 6.2. Specifically, the second milling unit 6 may be designed as a milling head comprising a corresponding housing structure 6.1 and at least one milling tool 6.2 disposed on the housing structure 6.1.

[0062] The housing structure 6.1 of the second milling unit 6 is, for example, directly or indirectly positioned on a sliding support structure 7, the support structure 7 being capable of translational movement along the machining axis or machine axis A1. As indicated by the double arrows P5 and P6, the support structure 7 may also be configured to support the second milling unit 6 so as to pivot with at least one degree of freedom about a pivot axis parallel or perpendicular to the machining axis or machine axis A1, and may be provided with one or more drive devices for this purpose. The degree of freedom of movement shown in particular by the double arrow P6 is arbitrary. The support structure 7 may further include one or more support elements 7.1 configured to support the workpiece 2. At least one support element 7.1 is capable of moving relative to the workpiece 2, for example radially with respect to the longitudinal axis of the workpiece 2, via one or more drive devices, thereby enabling the workpiece 2 to be supported in the area of ​​the support structure 7, i.e., the machining area by the second milling unit 6. Furthermore, at least one corresponding support element 7.1 is positioned or formed on the housing structure 6.1 of the second milling unit 6, and the housing structure 6.1 is operably mounted to the housing structure 6.1 together with or by at least one support element 7.1, and is considered operable with respect to the workpiece 2 so as to support the workpiece 2 in the area of ​​the support structure 7, and therefore in the processing area by the second milling unit 6.

[0063] To operate the second milling unit 6 relative to the workpiece 2 mounted by the mounting device 3, the machining center 1 is equipped with at least one drive unit assigned to the second milling unit 6, the drive unit being configured to generate a driving force that moves the second milling unit 6 relative to the workpiece 2 supported by the mounting device 3, and to transmit the driving force to the second milling unit 6. The operation of the second milling unit 6 is a translational operation along the translation axis indicated by the double arrow P7, which may coincide with or be parallel to the machining axis or machine axis A1.

[0064] In this embodiment, in addition to the translational degrees of freedom relative to the workpiece 2 supported by the mounting device 3, the second milling unit 6 can ideally operate with two degrees of freedom through rotational movement indicated by double arrows P5 and P6, centered on a pivot axis parallel to and perpendicular to the machining axis or machine axis A1. Therefore, in this embodiment, the second milling unit 6 can operate with respect to the workpiece 2 supported by the mounting device 3 with one translational degree of freedom and two degrees of freedom of rotation or rotational movement. This allows the second milling unit 6 to perform complex machining operations and introduce complex shapes into the workpiece 2.

[0065] In this embodiment, each milling unit 5,6 is mounted to be able to operate with one translational degree of freedom along the machining axis or machine axis A1, and at the same time, to be able to operate with one or more rotational degrees of freedom around a rotation axis parallel and / or perpendicular to the machining axis or machine axis A1. The translational and / or rotational movements of the milling units 5,6 are typically performed in coordination with or synchronous with the rotational movement of the workpiece 2 around its longitudinal axis.

[0066] The machining center 1 further includes a control device 8 implemented in hardware and / or software, which is used to control the operation of the first milling unit 5 by each degree of freedom of motion within or within a first machining area B1 assigned to the first milling unit 5 of the workpiece 2 supported by the mounting device 3, and is used to control the operation of the second milling unit 6 by each degree of freedom of motion within or within a second machining area B2 assigned to the second milling unit 6 of the workpiece 2 supported by the mounting device 3. Each machining area B1, B2 typically includes at least one machining path determined by start points B1.1, B2.1 and end points B1.1, B2.2, and within the machining path, each milling unit 5, 6 operates or is able to operate within the machining range of each machining area B1, B2. Each machining area B1 and B2 typically corresponds to an area or sub-area of ​​the workpiece 2 that is machined by the machining center 1. Therefore, each machining area B1 and B2 typically represents an area of ​​the workpiece 2 that is machined by the machining center 1.

[0067] Therefore, each milling unit 5,6 is typically assigned at least one machining area B1,B2, and each milling unit 5,6 must machine the assigned machining area B1,B2. By providing at least two milling units 5,6,6, the workpiece 2 is machined in different areas simultaneously (these correspond to the machining areas B1,B2 of each milling unit 5,6), which significantly improves the machining efficiency achievable by the machining center 1 compared to a machining center with only one milling unit.

[0068] The control device 8 is also typically designed to form or generate machining areas B1 and B2 and assign them to milling units 5 and 6. Thus, the control device 8 can be configured to determine the machining operations on the workpiece 2 by generating, forming, and assigning machining areas B1 and B2 in the sense of a machining work plan, and can even be adapted during the operation of the machining center 1 as needed, as will be described later. Specifically, the control device 8 may be configured to assign the first machining area B1 to the first milling unit 5 and the second machining area B2 to the second milling unit 6.

[0069] In this case, the control device 8 can take into account one or more input parameters, and may be configured to generate each machining area B1, B2 based on at least one input parameter and assign each machining area B1, B2 to the milling units 5, 6. The corresponding input parameters are, for example, geometric and structural parameters of the workpiece 2 to be machined, such as dimensions and shape; geometric and structural parameters of the machined workpiece 2, such as dimensions and shape; material parameters of the workpiece 2, such as hardness and machinability; parameters of the milling units 5, 6, such as power consumption; or parameters of the milling tools 5.2, 6.2, such as the type of milling tool 5.2, 6.2, the shape of the milling tool 5.2, 6.2, and the hardness of the milling tool 5.2, 6.2.

[0070] The control device 8 enables the operation of the first milling unit 5 within or around the first processing area B1, which is assigned to the first processing area B1, and the operation of the second milling unit 6 within or around the second processing area B2, which is assigned to the second processing area B2, and includes the control of one or more operating parameters, such as the power consumption of each milling unit 5, 6.

[0071] The control device 8 is assigned a user interface 8.1 implemented in hardware and / or software, through which the user can provide control-related inputs, and in particular, inputs regarding the planning and / or adaptation of machining operations via the user interface 8.1. Based on these, the control device 8 generates, forms, and assigns machining areas B1 and B2 in the sense of a machining operation plan, and adapts them as necessary, even during the operation of the machining center 1.

[0072] The control device 8 can be configured to control the operation of the first milling unit 5 with at least one degree of freedom, in particular depending on or independently of the operation of the second milling unit 6 with at least one degree of freedom, or the second and first milling units can be reversed. Thus, the operation of the first milling unit 5 with at least one degree of freedom is controlled depending on and therefore taking into account the operation of the second milling unit 6 with at least one degree of freedom (or the first and second milling units are controlled in the opposite way), thereby ensuring that the milling units 5 and 6 operate at a desired distance from each other in order to avoid situations such as the machining of the workpiece 2 by the first milling unit 5 in the first machining area B1 adversely affecting the machining of the workpiece 2 in the second machining area B2 (or the first and second machining areas being reversed). A modification that is easy to implement from a control technology standpoint is a method in which the operation of the first milling unit 5, which has at least one degree of freedom, is controlled independently of the operation of the second milling unit 6, which also has at least one degree of freedom. This means that each milling unit 5 and 6 operates independently of each other within their respective processing areas B1 and B2.

[0073] As described above, the control device 8 may be configured to assign the first machining area B1 to the first milling unit 5 and the second machining area B2 to the second milling unit 6. This also includes a control device 8 configured to assign machining, i.e., the complete machining of the first machining area B1, which is assigned to the first milling unit 5, by the first milling unit 5, and machining, i.e., the complete machining of the second machining area B2, which is assigned to the second milling unit 6, by the second milling unit 6.

[0074] As described above, each machining region B1, B2 typically includes at least one machining path formed by starting points B1.1, B2.1 and ending points B1.2, B2.2. Each starting point B1.1, B2.1 or ending point B1.2, B2.2 may be located in or within the end region of the workpiece 2 with respect to its longitudinal axis, as shown in Figure 1, or within the range of the workpiece 2, as shown in Figure 3. Therefore, for example, it is possible to start machining from the first end region of the workpiece 2, for example, the first free end of the workpiece 2, using the first milling unit 5, and thus the first milling unit 5 can be operated in the direction of the ending point B1.2 from the end region having the starting point B1.1 of the first machining region B1 during machining of the workpiece 2. Therefore, the ending point B1.2 of the first machining region B2 is shifted toward the second free end of the workpiece 2 ("machining from outside to inside"). However, the reverse procedure ("machining from inside to outside") is also possible. Similarly, it is possible to start machining from a second end region, such as the second free end of the workpiece 2, using the second milling unit 6. Therefore, it is possible to operate the second milling unit 6 in the direction of the end point B2.2 from the end region having the starting point B2.1 of the second machining region B2 during machining. Consequently, the end point B2.2 of the second machining region B2 shifts toward the first free end of the workpiece 2 ("machining from the outside to the inside"). In this case as well, the reverse procedure ("machining from the inside to the outside") is also possible.

[0075] Alternatively or additionally, the starting points B1.1, B2.1 or ending points B1.2, B2.2 of at least one machining region B1, B2 may be spaced apart from the end region of the workpiece 2 with respect to its longitudinal axis, or placed within the workpiece 2. Thus, variations are conceivable in which milling units 5, 6 (single-handedly) machine the end region of the workpiece 2 to form, for example, a specific interface, and another milling unit 5, 6 machine the remaining (internal) region of the workpiece 2 to form a functional shape necessary for the intended function of the machined workpiece 2.

[0076] In principle, the first processing area B1 and the second processing area B2 can overlap or not overlap in at least part (in the axial direction with respect to the longitudinal axis of the workpiece 2). In the first modified example, the starting point B1.1 and / or ending point B1.2 of the first processing area B1 are located within the second processing area B2 (or the first and second processing areas are located in the opposite direction), resulting in an overlapping area where processing of the workpiece 2 by both milling units 5 and 6 is possible. This is useful, for example, when processing an (unprocessed) workpiece 2 for the first time. Initial processing of the workpiece 2 in an area that can be designated as an initial area is performed by only one milling unit 5 or 6, and then the other milling unit 5 or 6 starts processing the workpiece 2 in or within the initially processed area (initial area). Therefore, the processing areas B1 and B2 assigned to each milling unit 5 or 6 can overlap at least in the area of ​​the workpiece 2 that includes the corresponding initial area. In the second modified example, the starting point B1.1 and / or ending point B1.2 of the first processing area B1 are located outside the second processing area B2 (or the first and second processing areas are located in the opposite order), thereby eliminating the need to provide any or fewer control-related measures, especially safety-related measures, to prevent unnecessary approach and collision of, for example, the milling units 5 and 6.

[0077] As described above, the control device 8 may be configured to adjust or change the first and / or second machining areas B1, B2. As a result, the machining areas B1, B2 initially assigned to each milling unit 5, 6 can be changed, i.e., enlarged or reduced. Accordingly, the control device 8 may also be configured to change the assignment of the first milling unit 5 to the first machining area B1, thereby allowing the first milling unit 5 to be assigned, at least partially, to the second machining area B2. Alternatively or additionally, the control device 8 may be configured to change the assignment of the second milling unit 6 to the second machining area B2, thereby allowing the second milling unit 6 to be assigned, at least partially, to the first machining area B1.

[0078] The adjustment or modification of each machining area B1 and B2 can be performed particularly dynamically. The adjustment or modification of each machining area B1 and B2 can be performed especially during the machining of the workpiece 2, i.e., during the operation of the milling units 5 and 6, and provides high flexibility in machining the workpiece 2, for example, by allowing the milling units 5 and 6 to work in at least one area of ​​the workpiece 2 that was not initially assigned. This allows for, for example, consideration of machining delays of other milling units 5 and 6. Therefore, the possibility of adjusting the first and / or second machining areas B1 and B2 can also have a positive impact on the efficiency of the machining center 1.

[0079] The machining center 1 may include a monitoring device 9 configured to monitor the operation of the first and / or second milling units 5 and 6 and to generate monitoring information indicating the operation of the first and / or second milling units 5 and 6. Monitoring the operation of the first and / or second milling units 5 and 6 includes monitoring the machining results and / or machining progress of each milling unit 5 and 6, and generating information indicating each machining result and / or machining progress, which may be included in the monitoring information.

[0080] The monitoring device 9 is designed as an optical monitoring device, such as an image or video recording device 9.1, or may include at least such a device. Alternatively or additionally, since information regarding the operation of the first and / or second milling units 5,6 can also be derived from monitored acoustic signals, monitoring devices with different configurations, such as acoustic monitoring devices, are also conceivable.

[0081] The control device 8 may be configured to adjust or change each processing area B1, B2 and / or the assignment of each processing area B1, B2 based on monitoring information. As a result, each processing area B1, B2 can be adjusted or changed considering the operation of each milling unit 5, 6, or the processing results and / or progress of each milling unit 5, 6, thereby enabling highly efficient processing of the workpiece 2.

[0082] As described above, the milling units 5 and 6 of the embodiment are operable with translational degrees of freedom in particular with respect to the workpiece 2. The operation of each milling unit 5 and 6 with translational degrees of freedom in relation to the workpiece 2 can be realized by at least one guide device 10 (see Figure 2 in particular), in particular at least one linear guide device. The at least one guide device 10 may extend along the machining axis or machine axis A1. The at least one guide device 10 comprises one or more guide elements 10.1, in particular linear guide elements such as guide rails, which are configured to interact with each milling unit 5 and 6 to form linearly operable guides. In particular, corresponding guide elements 10.1 may be configured to interact with opposing guide elements on the corresponding milling unit 5 and 6 side, for example mechanically, i.e., in particular by shape fitting and / or press-fitting. As described above, when the milling units 5 and 6 are positioned on, for example, one of the sliding support structures 11 or 7, the corresponding guide element 10.1 may be configured to interact with the corresponding opposing guide element of the corresponding support structure 11 or 7, for example, mechanically, i.e., particularly by shape fitting and / or press-fitting.

[0083] In this embodiment, for example, the first milling unit 5 and the second milling unit 6 are guided in common via a common guide device 10, thereby simplifying the design of the machining center 1 as only one (single) guide device 10 is required. Alternatively, each milling unit 5 and 6 may be guided by its own guide device 10.

[0084] The machining center 1 may further include a support device 12 configured to support the workpiece 2 to be machined by the machining center 1 at one or more support points along the longitudinal axis of the workpiece 2. This can avoid or at least reduce undesirable deflection of the workpiece 2 that adversely affects the machining of the workpiece 2 by the milling units 5,6. In an embodiment, the support device 12 may include a plurality of support elements 12.1, each support element 12.1 may be mounted to be movable between at least one working position in which the workpiece 2 can be supported at the support points and at least one non-working position in which the workpiece 2 cannot be supported at one or more support points.

[0085] In all embodiments, the first milling unit 5 and the second milling unit 6 are of the same design, thereby ensuring that the machining operations performed (or that can be performed) by the first milling unit 5 are not different from the machining operations performed (or that can be performed) by the second milling unit 6 (and the same applies if the first and second milling units are reversed). However, it is also conceivable that the first and second milling units 5 and 6 are not identical, in which case the machining operations performed (or that can be performed) by the first milling unit 5 will be different from the machining operations performed (or that can be performed) by the second milling unit 6 (and the same applies if the first and second milling units are reversed). For example, the first milling unit 5 may enable machining with a geometrically unformed cutting edge, while the second milling unit 6 may enable machining with a geometrically formed cutting edge. More specifically, the first milling unit 5 may enable, for example, rough machining of a workpiece, while the second milling unit 6 may enable, for example, finish machining rather than rough machining.

[0086] Furthermore, in all embodiments, the above-described functional units of the machining center 1, namely, in particular the mounting device 3 including each mounting unit 3.1 (if any), milling units 5, 6, monitoring device 9 (if any), guiding device 10 (if any), and support device 12 (if any), may be located or formed within the machine housing 13 that forms the upper housing structure of the machining center 1. The machine bed 4 may also be located or formed within the machine housing 13 of the machining center 1.

[0087] The machining center 1 shown in several embodiments may be used to carry out a machining method for manufacturing elongated metal workpieces 2, in particular drive elements, in particular drive elements for drill strings. The method particularly includes the steps of: supporting the elongated metal workpiece 2 to be machined by the machining center 1; operating a first milling unit 5 with respect to the supported workpiece 2 with at least one degree of freedom, and machining the workpiece 2 with the first milling unit 5 in at least one first machining area B1 assigned to the first milling unit 5; and operating a second milling unit 6 with respect to the supported workpiece 2 with respect to at least one degree of freedom, and machining the workpiece 2 with the second milling unit 6 in at least one second machining area B2 assigned to the second milling unit 6. Furthermore, this method includes the steps of controlling the operation of the first milling unit 5 with at least one degree of freedom in or within the first processing area B1 assigned to the first milling unit 5, and controlling the operation of the second milling unit 6 with at least one degree of freedom in or within the second processing area B2 assigned to the second milling unit 6.

[0088] Each, multiple, or all of the features described in relation to one embodiment can be combined with each, multiple, or all of the features described in relation to at least one other embodiment.

Claims

1. A machining center for processing elongated metal workpieces, particularly for manufacturing drive elements for drill strings, A mounting device for attaching a long, slender metal workpiece to be processed, A first milling unit that can operate with at least one degree of freedom relative to a workpiece mounted by a mounting device, A second milling unit that can operate with at least one degree of freedom relative to the workpiece mounted by the mounting device, A machining center characterized by comprising a control device configured to control the operation of the first milling unit with at least one degree of freedom of movement in or within the first machining area of ​​a workpiece assigned to the first milling unit, and to control the operation of the second milling unit with at least one degree of freedom of movement in or within the second machining area of ​​a workpiece assigned to the second milling unit.

2. The machining center according to claim 1, wherein the control device is configured to control the operation of the first milling unit by at least one operating degree of freedom, either in accordance with or independently of the operation of the second milling unit by at least one operating degree of freedom, or vice versa.

3. The machining center according to claim 1 or 2, wherein the control device is configured to assign a first machining area of ​​the workpiece to a first milling unit and a second machining area of ​​the workpiece to a second milling unit.

4. A machining center according to any one of claims 1 to 3, wherein each machining area includes a machining path formed by a start point and an end point, and each start point or end point is located within the range of the workpiece or at the end of the workpiece relative to its longitudinal axis.

5. A machining center according to any one of claims 1 to 4, wherein the first machining area and the second machining area overlap or do not overlap in at least part of each other.

6. The machining center according to any one of claims 1 to 5, wherein the control device is configured to change the first machining area and / or the second machining area.

7. A machining center according to any one of claims 1 to 6, wherein the control device changes the assignment of the first milling unit to the first machining area so that the first milling unit can also be assigned to or at least partially to the second machining area, and / or the control device changes the assignment of the second milling unit to the second machining area so that the second milling unit can also be assigned to or at least partially to the first machining area.

8. A machining center according to any one of claims 1 to 7, comprising a monitoring device that monitors the operation of a first milling unit and / or a second milling unit and generates corresponding monitoring information.

9. The machining center according to claim 7 or 8, wherein the control device is configured to change each machining area and / or assignment based on monitoring information.

10. A machining center according to any one of claims 1 to 9, wherein the first milling unit and the second milling unit are operably mounted via common or different guide devices.

11. The mounting device is configured to mount the workpiece to be machined by the machining center so that it can rotate around the longitudinal axis of the workpiece, according to any one of claims 1 to 10.

12. A machining center according to any one of claims 1 to 11, comprising a support device for supporting a workpiece to be machined by the machining center at one or more support points along the longitudinal axis of the workpiece.

13. A machining center according to any one of claims 1 to 12, wherein the first milling unit and / or the second milling unit are mounted on a workpiece supported by a support device, having translational and / or rotational degrees of freedom.

14. The machining center according to any one of claims 1 to 13, wherein the first milling unit is mounted to a workpiece mounted by a mounting device so as to be operable not only with respect to the workpiece mounted by the mounting device with respect to translational degrees of freedom that are operable along the translation axis, but also with respect to the workpiece mounted by the mounting device with respect to at least one further degree of freedom.

15. A machining center according to any one of claims 1 to 14, wherein the housing structure of the first milling unit and / or the second milling unit is arranged in particular on a sliding support structure, and the support structure is capable of translational movement along the machining axis or machine axis of the machining center.

16. The machining center according to claim 15, wherein the support structure is configured to support a first milling unit and / or a second milling unit, and rotates with at least one degree of freedom about a pivot axis oriented parallel or perpendicular to, for example, the machining axis or machine axis of the machining center.

17. The machining center according to claim 15 or 16, wherein the support structure comprises one or more support elements configured to support a workpiece.

18. The machining center according to claim 17, wherein at least one support element is driven relative to the workpiece, for example radially with respect to the longitudinal axis of the workpiece, via one or more drive devices, to support the workpiece in the area of ​​the support structure, or where at least one support element is arranged or formed in the housing structure of the first milling unit, and at least one support element, or at least one support element alone, is operably mounted to the housing structure.

19. A method for machining elongated metal workpieces, particularly for manufacturing drive elements for drill strings, - The process of attaching the elongated metal workpiece to be machined by the machining center, - A step of operating the first milling unit with at least one degree of freedom relative to the attached workpiece, and processing the workpiece with the first milling unit in at least one first processing area assigned to the first milling unit, - A process of operating a second milling unit with at least one degree of freedom relative to a supported workpiece, and processing the workpiece with the second milling unit in at least one second processing area assigned to the second milling unit, - A step of controlling the operation of the first milling unit with at least one degree of freedom within or within the first processing area of ​​the workpiece assigned to the first milling unit, A machining method characterized by comprising the step of controlling the operation of the second milling unit with at least one degree of freedom in or within the range of the second machining area of ​​a workpiece assigned to the second milling unit.

20. The method according to claim 19, which is performed using a machining center according to any one of claims 1 to 18.

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