Numerically controlled machine tool and method for machining a workpiece

Abstract

The invention relates to a numerically controlled machine tool 100 which comprises a machine bed 99, a first spindle device 1 and a second spindle device 2 which can be moved relative to the machine bed 99 and which each comprise a spindle housing 1a, 2a and a working spindle which is rotatably mounted therein, having a receiving interface 1b, 2b in which a tool 200 or a workpiece 300 can be received, a first carrier device 10 to which the spindle housing 1a of the first spindle device 1 is fastened, and a second carrier device 20 to which the spindle housing 2a of the second spindle device 2 is fastened. The first carrier device 10 comprises at least three linear axes via which the first spindle device 1 fastened to the first carrier device 10 can be moved relative to the machine bed 99 in a first, a second and a third direction. The second carrier device 20 comprises at least two linear axes via which the second spindle device 2 fastened to the second carrier device 20 can be moved relative to the machine bed 99 in a fourth and a fifth direction. Furthermore, the spindle housing 2a of the second spindle device 2 is fastened to the second carrier device 20 via a rotatable mounting in such a way that the second spindle device 2 can be rotated relative to the second carrier device 20 about a second axis of rotation, which in particular extends horizontally, via a rotary axis of the second carrier device 20. The machine tool 100 is at least designed to machine a workpiece 300 received by one of the work spindles of the first or the second spindle device 1, 2 by means of a tool 200 received by the other work spindle of the first or the second spindle device 1, 2.

Description

Numerically controlled machine tool and method for machining a workpiece DESCRIPTION Technical field

[0001] The present invention relates to a numerically controlled machine tool and a method for machining a workpiece. Background of the invention

[0002] In the field of automated manufacturing, numerically controlled machine tools are known, which are used for the semi- or fully automated machining of workpieces.

[0003] The machine tools usually have a large number of components that are mounted in a way that allows them to move relative to each other via controllable linear and / or rotary axes, in order to implement the relative movements between tool and workpiece that are necessary for machining the workpiece.

[0004] As part of the further development of such machine tools, they should be able to implement a wide variety of machining processes, so that, for example, a single machine tool can perform a wide variety of machining operations on the workpiece.

[0005] Various machine concepts are known from the state of the art for this purpose.

[0006] For example, the EP 3 412 403 Al shows a machine tool for combined milling and turning operations using two spindle devices, each carrying a working spindle and which can be moved relative to each other via two rotary axes and three linear axes.

[0007] One of the work spindles can hold a tool and the other work spindle can hold the workpiece to be machined, whereby driving the work spindle carrying the tool enables milling operations and driving the work spindle holding the workpiece enables turning operations. Summary

[0008] Starting from the state of the art, the object of the present invention is to provide an improved concept for the automated milling and turning of workpieces, with which in particular manufacturing times in the field of automated manufacturing can be reduced.

[0009] To solve this problem, the numerically controlled machine tool according to claim 1 and the method according to claim 18 are provided.

[0010] The respective dependent claims relate to preferred embodiments, which can each be provided individually or in combination.

[0011] According to a first aspect of the invention, a numerically controlled machine tool is provided, comprising a machine bed, a first spindle assembly, and a second spindle assembly, which are movable relative to the machine bed and each comprise a spindle housing and a work spindle rotatably mounted therein with a receiving interface in which a tool or a workpiece can be received, a first support device to which the spindle housing of the first spindle assembly is attached, and a second support device to which the spindle housing of the second spindle assembly is attached. The first support device comprises at least three linear axes about which the first spindle assembly, attached to the first support device, can be moved relative to the machine bed in a first, a second, and a third direction.The second support device comprises at least two linear axes, via which the second spindle device, attached to the second support device, can be moved relative to the machine bed in a fourth and a fifth direction. Furthermore, the spindle housing of the second spindle device is attached to the second support device via a rotatable bearing, such that the second spindle device can be rotated relative to the second support device about a second axis of rotation, which is particularly horizontal, via a rotary axis of the second support device. The machine tool is at least configured to machine a workpiece held by one of the work spindles of the first or the second spindle device using a tool held by the other work spindle of the first or the second spindle device.

[0012] In this way, a machine concept is provided in which two work spindles, each capable of holding a workpiece or a tool, can be moved relative to each other via a multitude of numerically controlled axes of the machine tool (linear and rotary axes).

[0013] This allows for the implementation of a wide variety of machining kinematics, in which one or both of the work spindles can be moved relative to the machine bed and relative to each other. In this way, machining operations can be carried out that would not be possible on machine tools based on previously known machine concepts.

[0014] This allows both support devices to be moved relative to each other and relative to the machine bed via at least five linear axes, enabling virtually all relative positioning of the tool and workpiece, for example, both when stationary. The tool can be used for adjustments even with the workpiece stationary. Additionally, at least one rotary axis allows for changes in the orientation of the tool and workpiece.

[0015] Such a positioning option is particularly advantageous when large and / or heavy workpieces are to be machined, which should only be moved a little, even with regard to inertial effects or possible collisions with other components in the workspace.

[0016] The workpiece can be picked up by one or the other working spindle of the first and second spindle device and preferably also transferred from one working spindle to the other.

[0017] Such a transfer would, for example, allow all six sides of the workpiece to be machined on one and the same machine tool, since by transferring the workpiece the former clamping point or the workpiece end held in the receiving interface of one work spindle can be made accessible for machining.

[0018] The linear and rotary axes are to be understood as controllable drive axes of the machine tool, which can be controlled by a control device of the machine tool in order to implement a relative movement (translation or rotation) between two components. For this purpose, said linear and rotary axes preferably comprise a drive unit, in particular an electric drive unit, and a transmission mechanism coupled to it. The drive unit preferably provides a rotary motion, which is translated into the desired relative motion via the transmission mechanism.

[0019] For example, and this is not limited to, the linear axes can be designed as a spindle system, for example as a trapezoidal spindle system or as a ball screw system.

[0020] The procedure or the ability to move "along a direction" is to be understood as meaning that the component in question can be moved back and forth in said direction or at least parallel to it.

[0021] The work spindles are driven rotaryally in their respective spindle housings, in particular via an electric motor, in order to provide the necessary rotation of the tool or workpiece for machining operations, e.g. milling or turning.

[0022] The mounting interfaces of the work spindles can have a switchable clamping unit with movable clamping elements for clamping a tool or workpiece, such as a chuck or the like.

[0023] Furthermore, the mounting interfaces can also be adapted to standardized fastening interfaces provided on the tools and / or workpieces. For example, the tools and / or workpieces can have an HSK interface (hollow shank taper), a Capto interface, an SK interface (steep taper) or an MK interface (Morse taper), wherein the receiving interfaces of the work spindles are adapted accordingly.

[0024] The spindle devices are at least partially arranged in a working area of ​​the machine tool during workpiece machining. The working area of ​​the machine tool is to be understood as the space or area in which the machining of a workpiece brought into the working area is carried out by a tool operated by the machine tool.

[0025] The work area is preferably at least partially separated from the surroundings of the machine tool by an enclosure.

[0026] Preferably, the support devices are arranged completely or at least mostly outside the working area in order to shield against contaminants (e.g., chips or coolant lubricant) that may occur during machining.

[0027] The preferably horizontal axis of rotation is to be understood as always being horizontal, i.e., even when the spindle device is moved by means of the support device, it is always orthogonal to the Earth's gravitational field, which is intended to define the vertical.

[0028] Preferably, the spindle axis of the second spindle device mounted on the second support device runs at an angle, particularly preferably orthogonally to the second axis of rotation.

[0029] The first five directions need not be constant with respect to a machine-bed-fixed reference frame. This means that the direction vectors of the respective directions with respect to the machine bed can be changed, for example by rotation or translation, especially parallel translation as a result of traversing movements of machine tool components.

[0030] In said machine-bed fixed coordinate system, the direction vectors of the first to third directions are preferably linearly independent, and direction vectors of the fourth and fifth directions are also preferably linearly independent.

[0031] Although the directions for the second support device are numerically designated as the fourth and fifth directions, this does not mean that the second support device is movable in five directions relative to the machine. The numbering of the directions was simply chosen sequentially after the introduction of the first three directions. Accordingly, the fourth and fifth directions (and later also the sixth direction) are directions of the machine tool itself and can be understood as the first, second, and third directions of the second support device.

[0032] Even in the case of the second axis of rotation, this does not mean that the second spindle assembly is rotatable around two axes. The numbering of the axis of rotation as "second axis of rotation" was chosen solely to establish a connection to the second spindle assembly.

[0033] In a preferred embodiment, the spindle housing of the first spindle device is attached to the first support device via a rotatable bearing, such that the first spindle device can be rotated about a first axis of rotation, which in particular runs horizontally, relative to the first support device via a rotary axis of the first support device.

[0034] This allows both the first and second spindle devices to be rotatable relative to the respective support device, which expands the possibilities for the relative alignment of tool and workpiece.

[0035] Preferably, the spindle axis of the first spindle device mounted on the first support device runs at an angle, particularly preferably orthogonally to the first axis of rotation.

[0036] In a preferred embodiment, the first and second spindle devices are mounted on the respective first and second support devices in such a way that the first axis of rotation and the second axis of rotation run parallel to each other.

[0037] This allows the relative orientation of the workpiece and tool to be achieved in parallel, vertical planes of rotation.

[0038] The parallel axes of rotation are to be understood as always being parallel to each other, even during traversing movements of one or both spindle devices by means of the respective support devices.

[0039] In a preferred embodiment, the first support device is designed such that one direction of the first, second and third direction runs vertically and one or both other directions of the first, second and third direction run horizontally.

[0040] Preferably, the first, second and third directions form an orthogonal direction system, in which one of the directions runs along the vertical plane and the other two lie in a horizontal plane.

[0041] Preferably, the fourth and fifth directions are also orthogonal to each other.

[0042] Providing an orthogonal direction system significantly simplifies the control of the individual linear axes to implement the necessary machining movements.

[0043] In a preferred embodiment, the first and second support devices are designed such that the fourth direction and the fifth direction each run parallel to one of the first, second or third directions.

[0044] For example, the fourth direction runs parallel to the first direction, and the fifth The direction runs parallel to the second direction.

[0045] This allows the same relative positioning of the tool and workpiece to be achieved either by controlling the linear axes for the fourth and fifth directions or by controlling the linear axes for the parallel directions of the first, second, or third directions. This makes it easy to achieve the same relative positioning whether the tool or the workpiece is stationary relative to the machine bed. Depending on the machining operation (e.g., turning or milling) and the workpiece's properties and geometry, one or the other of the aforementioned approaches may prove advantageous.

[0046] In this respect, the machine tool allows for an optimal and easy-to-implement relative positioning of tool and workpiece for a wide variety of machining operations.

[0047] In a preferred embodiment, the machine tool further comprises a tailstock device attached to the machine bed, wherein the machine tool is configured, in preparation for workpiece machining, to bring an outer contour of a workpiece received by the work spindle of the first spindle device, in particular a workpiece end facing away from the receiving interface of the work spindle, into contact by a movement of the tailstock device and / or a movement of the first spindle device with the tailstock device, in order to support the workpiece via the tailstock device during workpiece machining.

[0048] In this way, one end of the workpiece being machined can be supported, for example during turning or cylindrical grinding operations, in order to reduce deflection of the workpiece, which would otherwise be clamped on one side in the spindle's mounting interface, and thus improve machining quality. Such deflections are caused in particular by the contact forces between the tool and the workpiece, or by gravitational forces acting on the workpiece, or by imbalance forces caused by the workpiece's rotation.

[0049] The tailstock device is not limited to a specific design and can be implemented according to solutions known in the prior art. For example, it can include a center point, preferably attached to an extendable quill.

[0050] Preferably, the quill can be extended via another controllable linear axis of the machine tool.

[0051] Alternatively or additionally, the machine tool can be set up to bring an outer contour of a workpiece held by the work spindle of the second spindle device, in particular a workpiece end facing away from the holding interface of the work spindle, into contact with the tailstock device by means of a movement of the tailstock device and / or a movement of the second spindle device with the tailstock device in order to support the workpiece via the tailstock device during workpiece machining.

[0052] The tailstock device can be fixed to the machine bed, or it can be moved relative to the machine bed for alignment with the workpiece (translational and / or rotational).

[0053] The tailstock device for alignment with the workpiece is preferably mounted on the machine bed in a slidable manner and comprises one or more linear axes, via which a tailstock section of the tailstock device (for example in the form of a centering tip), which is intended to come into contact with a workpiece, can be moved (translatively) relative to the machine bed.

[0054] Preferably, the tailstock device is mounted so as to be displaceable in two directions relative to the machine bed and comprises two linear axes, so that the tailstock section can be moved to any point of a tailstock plane, wherein the tailstock plane is in particular horizontal or vertical.

[0055] Preferably, the tailstock device is rotatably mounted on the machine bed for alignment with the workpiece and comprises at least one rotary axis about which a tailstock section of the tailstock device (for example, in the form of a center point), which is intended to come into contact with a workpiece, can be rotated relative to the machine bed. Preferably, one axis of rotation of the rotary axis of the tailstock device runs parallel to the first or second axis of rotation of the spindle devices.

[0056] The tailstock assembly can comprise either just one rotary axis or one or more linear axes. Alternatively, the tailstock assembly can also comprise the rotary axis and one or more linear axes.

[0057] In a preferred embodiment, the machine tool further comprises a steady rest device attached to the machine bed, wherein the machine tool is configured, in preparation for workpiece machining, to form an outer contour of a workpiece received by the work spindle of the first spindle device, in particular an outer circumferential section of the workpiece located between the receiving interface of the work spindle and an end face of the workpiece facing away from it, by a method of steady rest device and / or a method of bringing the first spindle device into contact with the steady rest device in order to support the workpiece via the steady rest device during workpiece machining.

[0058] In this way, the outer circumference of the workpiece being machined can be supported, for example during turning or cylindrical grinding operations, in order to reduce deflection of the workpiece, which would otherwise be clamped on one side in the spindle's mounting interface, and thus increase machining quality. Such deflections are caused in particular by the contact forces between the tool and the workpiece, or by gravitational forces acting on the workpiece, or by imbalance forces caused by the workpiece's rotation.

[0059] The steady rest device can be fixed to the machine bed, or it can be moved relative to the machine bed for alignment with the workpiece (translationally and / or rotationally).

[0060] The steady rest device for alignment with respect to the workpiece is preferably mounted on the machine bed in a slidable manner and comprises one or more linear axes, via which a steady rest section of the steady rest device, which is intended to come into contact with a workpiece, can be moved (translatively) relative to the machine bed.

[0061] Preferably, the bezel device is mounted so as to be displaceable in two directions relative to the machine bed and comprises two linear axes, so that the bezel section can be moved to any point of a bezel plane, wherein the bezel plane is in particular horizontal and / or vertical.

[0062] Preferably, the steady rest device is rotatably mounted on the machine bed for alignment with the workpiece and comprises at least one rotary axis about which a steady rest section of the steady rest device, intended to come into contact with a workpiece, can be rotated relative to the machine bed. Preferably, one axis of rotation of the rotary axis of the steady rest device runs parallel to the first or second axis of rotation of the spindle devices.

[0063] The bezel assembly can comprise either just one rotary axis or one or more linear axes. Alternatively, the bezel assembly can also comprise the rotary axis and one or more linear axes.

[0064] Unlike a tailstock, a steady rest does not typically support the workpiece at its end, but rather allows it to be supported in the middle along its length. This is particularly advantageous for relatively long and / or thin workpieces where end support by a tailstock is insufficient to prevent deflection.

[0065] The bezel device is not limited to a specific design and can be implemented according to solutions known in the prior art. For example, and this is not a limitation, it can be designed as a C-shaped bezel, a ring bezel, or a roller block, which in particular determine the shape and / or design of the bezel section.

[0066] Alternatively or additionally, the machine tool can be set up to bring an outer contour of a workpiece received by the work spindle of the second spindle device, in particular an outer circumferential section of the workpiece which lies between the receiving interface of the work spindle and a workpiece end side facing away from it, into contact with the steady rest device by means of a process of the steady rest device and / or a process of the second spindle device with the steady rest device, in order to support the workpiece via the steady rest device during workpiece machining.

[0067] In a preferred embodiment, the machine tool further comprises a third spindle device, which includes a spindle housing and a work spindle rotatably mounted therein with a receiving interface in which a tool or a workpiece can be received, wherein the third spindle device is directly attached to the machine bed, preferably in such a way that the spindle housing of the third spindle device is rotatably mounted on the machine bed, such that the third spindle device can be rotated about a third axis of rotation relative to the machine bed via a further rotary axis.

[0068] This creates another possibility in the machine bed for receiving a tool, which can be brought into contact with the workpiece, for example by a process of the first or second spindle device carrying the workpiece.

[0069] For example, the tool held in the work spindle of the third spindle device can be a grinding tool or a deburring tool, which allows the workpiece to be reworked directly after machining by the tool carried by one of the work spindles of the first or second spindle device, without said work spindles of the first or second spindle device having to put down their tool.

[0070] For example, the third spindle device can also be used as the intermediate storage location described later.

[0071] In a preferred embodiment, the first support device comprises a first, a second and a third support element.

[0072] Preferably, the first support element is slidably mounted on the machine bed along the first direction, in particular via guide rails attached to the machine bed, which are preferably provided in pairs, such that the first The support element can be moved relative to the machine bed via a first of at least three linear axes of the first support device in the first direction.

[0073] Preferably, the second support element is slidably mounted on the first support element along the second direction, in particular via guide rails attached to the first support element, which are preferably provided in pairs, such that the second support element can be moved relative to the first support element in the second direction via a second of the at least three linear axes of the first support device.

[0074] Preferably, the third support element is slidably mounted on the second support element along the third direction, in particular via guide rails attached to the second support element, such that the third support element can be moved relative to the second support element in the third direction via a third of the at least three linear axes of the first support device.

[0075] Preferably, the first spindle device is attached to the third support element.

[0076] This design, consisting of several carrier elements that can be moved relative to each other, results in a particularly rigid structure of the support device, which, for example, reduces the extent of deformations caused by machining forces and thus enables more precise positioning of the tool and workpiece even during machining, in turn leading to high machining quality.

[0077] Preferably, the bearing is provided via the guide rails by means of one or more guide shoes that engage in one of the guide rails. For example, the second support element comprises four guide shoes, two of which engage in a first guide rail of the first support element and two further of which engage in a second guide rail of the first support element. Identical configurations can also be provided in the other bearings of the remaining support elements, whereby the number of guide rails and the number of guide shoes should not be understood as limited to 2 and 4, respectively.

[0078] This allows for the implementation of a particularly rigid, movable bearing arrangement.

[0079] In a preferred embodiment, the second support device comprises a fourth and a fifth support element.

[0080] Similar to the arrangement of directions, the numbering of the support elements was chosen to be consecutive, so that the designation of a fifth support element does not mean that the second support structure also comprises a total of five support elements. Thus, the fourth and fifth support elements (and later the sixth) can be understood as the first, second (and third) support elements of the second support structure.

[0081] Preferably, the fourth support element is slidably mounted on the machine bed along the fourth direction, in particular via brackets attached to the machine bed. Guide rails, preferably provided in pairs, such that the fourth support element can be moved relative to the machine bed in the fourth direction via a first of the at least two linear axes of the second support device.

[0082] Preferably, the fifth support element is slidably mounted on the fourth support element along the fifth direction, in particular via guide rails attached to the fourth support element, which are preferably provided in pairs, such that the fifth support element can be moved relative to the fourth support element in the fifth direction via a second of the at least two linear axes of the second support device.

[0083] Preferably the second spindle device is attached to the fifth support element.

[0084] In a preferred embodiment, the second support device comprises at least three linear axes, via which the second spindle device attached to the second support device can be moved relative to the machine bed along the fourth, fifth and a sixth direction.

[0085] Preferably, the sixth direction is orthogonal to the fourth and fifth directions, so that the fourth to sixth directions form an orthogonal direction system.

[0086] Preferably the first and second support devices are preferably designed such that the sixth direction of the second support device runs parallel to one of the first, second or third directions.

[0087] In particular, the sixth direction runs parallel to the third direction.

[0088] In a preferred embodiment with three linear axes of the second support device, the second support device comprises a sixth support element in addition to the fourth and fifth support elements.

[0089] Preferably, the sixth support element is slidably mounted on the fifth support element along the sixth direction, in particular via guide rails attached to the fifth support element, which are preferably provided in pairs, such that the sixth support element can be moved relative to the fifth support element in the sixth direction via a third of the at least three linear axes of the second support device.

[0090] Preferably, in the case of three linear axes of the second support device, the second spindle device is attached to the sixth support element.

[0091] The advantages already mentioned for this setup in the case of the first support device apply analogously here.

[0092] In a preferred embodiment, the machine tool is set up for 6-sided machining of a workpiece.

[0093] In a preferred embodiment, the machine tool is set up for 6-sided machining, and a workpiece is mounted in the working spindle of the first spindle device. The workpiece is inserted into the receiving interface of the working spindle of the second spindle device for receiving by means of a process using the first and / or the second spindle device.

[0094] Alternatively or additionally, the machine tool can be set up to insert a workpiece held in the working spindle of the second spindle device into the receiving interface of the working spindle of the first spindle device for holding there by means of a process of the first and / or the second spindle device.

[0095] In a preferred embodiment, the machine tool comprises an intermediate storage location for receiving a workpiece, wherein the machine tool is configured for 6-sided machining, inserting a workpiece received in the work spindle of the first spindle device into the intermediate storage location by a movement of the first spindle device and subsequently receiving the workpiece received in the intermediate storage location into the receiving interface of the work spindle of the second spindle device by a movement of the second spindle device.

[0096] Alternatively or additionally, the machine tool can be set up to insert a workpiece held in the work spindle of the second spindle device into the intermediate storage location by means of a movement of the second spindle device and subsequently to pick up the workpiece held in the intermediate storage location into the receiving interface of the work spindle of the first spindle device by means of a movement of the first spindle device.

[0097] In a preferred embodiment, the machine tool comprises a first magazine device which in turn has a plurality of receiving positions in which a tool or a workpiece can each be received, wherein the first magazine device preferably comprises a wheel magazine.

[0098] In the case of a wheel magazine, the multitude of storage locations are arranged around an outer circumference of a circular carrier, wherein the circular carrier can be rotated about an axis of rotation relative to a holding device to which the carrier is attached via a circular axis.

[0099] Preferably the first magazine device K comprises wheel magazines with the natural number KE [1, 10], whose axes of rotation are preferably coaxially aligned.

[0100] Preferably, the first magazine device comprises a wheel magazine for workpieces and a wheel magazine for tools.

[0101] The magazine device can store both workpieces and tools, enabling quick changes of workpieces and tools on the work spindles in order to reduce the downtime of the machine tool.

[0102] In a preferred embodiment, the machine tool comprises a first tool changer configured to remove a tool or workpiece from any of the multiple receiving positions of the first magazine device and to insert the removed workpiece / tool ​​into the receiving interface of the work spindle of the first and / or the second spindle device, and similarly configured to remove a tool or workpiece from the receiving interface of the work spindle of the first and / or the second spindle device and to insert the removed workpiece / tool ​​into a receiving position of the multiple receiving positions of the first magazine device.

[0103] This allows the workpiece and / or tool change on the work spindles of the first and / or second spindle device to be carried out fully automatically.

[0104] Preferably, the first changing device comprises at least a rotary axis with which a gripper section of the first changing device can be rotated relative to the machine bed and / or a linear axis with which the gripper section can be moved relative to the machine bed between the first magazine device and the first and / or the second spindle device.

[0105] This creates a comprehensive range of motion for the first changing device, so that the first magazine device can preferably be located outside the work area.

[0106] In a preferred embodiment, the machine tool comprises a second magazine device which in turn has a plurality of receiving positions in which a tool or a workpiece can each be received, wherein the second magazine device preferably comprises a wheel magazine, and wherein the first magazine device is associated with the first spindle device and the second magazine device is associated with the second spindle device.

[0107] In this way, changeover processes on the respective work spindles can be accelerated, since the magazine device can be provided in the immediate vicinity of its associated spindle device.

[0108] Preferably the second magazine device L comprises wheel magazines with the natural number LE [1, 10], whose axes of rotation are preferably coaxially aligned.

[0109] Preferably, the second magazine device comprises a wheel magazine for workpieces and a wheel magazine for tools.

[0110] Preferably, in the case of a second magazine device, the first changing device is configured solely for interaction with the first magazine device, and the machine tool also includes a second changing device which is configured to pick up a tool or a workpiece from any of the mounting positions of the plurality of to remove a tool or workpiece from the holding positions of the second magazine device and insert the removed workpiece / tool ​​into the holding interface of the work spindle of the second spindle device, and is also equipped to remove a tool or workpiece from the holding interface of the work spindle of the second spindle device and insert the removed workpiece / tool ​​into a holding position of the plurality of holding positions of the second magazine device.

[0111] In this way, each magazine device has its own changing device, so that a simultaneous workpiece or tool change can take place on both magazine devices or on both spindle devices, which in turn reduces downtime.

[0112] Preferably, the second changing device comprises at least a rotary axis with which a gripper section of the second changing device can be rotated relative to the machine bed and / or a linear axis with which the gripper section can be moved relative to the machine bed between the second magazine device and the second spindle device.

[0113] According to a second aspect of the invention, a method for machining a workpiece using a machine tool according to the first aspect or one of its preferred embodiments is provided. The method comprises providing a machine tool according to any one of claims 1 to 17 and machining a workpiece using one of the work spindles of the first or the second spindle assembly of the provided machine tool. The workpiece is picked up by the machine tool using one of the other working spindles of the first or second spindle device provided. machine tool with tool in place.

[0114] In this way, a workpiece is machined using the advantageous machine kinematics of the machine tool described above, in which preferably almost all relative positioning of tool and workpiece can be carried out, for example, both with the tool and the workpiece stationary.

[0115] Preferably, the machining of the workpiece comprises driving the tool-carrying work spindle of the first or second spindle device, and further preferably, the machining of the workpiece alternatively or additionally comprises driving the other work spindle of the first or second spindle device that carries the workpiece.

[0116] Preferably, the machining of the workpiece comprises a method of the first spindle device by means of a first linear axis of the at least three linear axes and / or a second linear axis of the at least three linear axes and / or a third linear axis of the at least three linear axes of the first support device of the provided machine tool.

[0117] Preferably, the machining of the workpiece further comprises a method of the second spindle device using a first linear axis of at least two linear axes. and / or a second linear axis of the at least two linear axes of the second support device of the provided machine tool.

[0118] Preferably, the machining of the workpiece includes turning the second Spindle device using the rotary axis of the second support device of the provided machine tool.

[0119] Preferably, the method is a method for 6-sided machining of the workpiece. For this purpose, the method preferably comprises transferring the workpiece from one working spindle of the first or second spindle device to the other working spindle of the first or second spindle device.

[0120] Preferably, the method for this includes, in advance, removing the tool from the work spindle carrying the tool in order to clear the receiving interface for the transfer of the workpiece.

[0121] Preferably, the machine tool is a machine tool in the configuration with a tailstock device. The method further comprises supporting the workpiece by the tailstock device of the provided machine tool, wherein the method for this purpose includes, prior to this, contacting one end of the workpiece with the tailstock device by moving the spindle device, whose work spindle carries the workpiece.

[0122] Preferably, the machine tool is a machine tool in the configuration with a steady rest device. The method further comprises supporting the workpiece by the steady rest device of the provided machine tool, wherein the method for this purpose includes, in advance, contacting an outer circumferential section of the workpiece with the steady rest device by moving the spindle device, whose working spindle carries the workpiece.

[0123] Further aspects and their advantages, as well as more specific embodiments of the aforementioned aspects and embodiments, are described below with the aid of the drawings shown in the accompanying figures.

[0124] Fig. 1A shows a first embodiment of the machine tool according to the invention in a perspective view.

[0125] Fig. 1B shows an enlarged section of the machine tool shown in Fig. 1A.

[0126] Fig. 2A shows a second embodiment of the machine tool according to the invention in a perspective view.

[0127] Fig. 2B shows an enlarged section of the machine tool shown in Fig. 2A.

[0128] Fig. 3 schematically shows a sequence of an embodiment of the method according to the invention.

[0129] It is emphasized that the present invention is in no way limited to the embodiments and features described below. The invention further comprises modifications of the aforementioned embodiments, in particular those resulting from modifications and / or combinations of individual or multiple features of the described embodiments within the scope of protection of the independent claims. Detailed character description

[0130] Fig. 1A shows a first embodiment of the machine tool 100 according to the invention in a perspective view. Fig. 1B shows a corresponding enlarged section in the area of ​​the spindle devices 1, 2. Figs. 1A and 1B are described together below.

[0131] The numerically controlled machine tool 100 comprises a machine bed 99, a first spindle device 1, a second spindle device 2, a first support device 10 and a second support device 20.

[0132] The first spindle device 1 and the second spindle device 2 are movable relative to the machine bed 99 and each comprise a spindle housing 1a, 2a and a work spindle rotatably mounted therein about a spindle axis with a receiving interface 1b, 2b in which a tool 200 or a workpiece 300 can be received.

[0133] The machine tool 100 is at least equipped to machine a workpiece 300 held by one of the work spindles of the first or the second spindle device 1, 2 by means of a tool 200 held by the respective other work spindle of the first or the second spindle device 1, 2.

[0134] In the state shown in Figs. 1A and 1B, the first spindle device 1 carries the tool 200 and the second spindle device 2 carries the workpiece 300.

[0135] The spindle devices 1, 2 are supported by the support devices 10, 20, wherein the spindle housing 1a of the first spindle device 1 is attached to the first support device 10 and the spindle housing 2a of the second spindle device 2 is attached to the second support device 20.

[0136] The spindle devices 1, 2 are movable relative to the machine bed 99 and also relative to each other via the respective support devices 10, 20.

[0137] The support devices 10, 20 are preferably arranged side by side on a top side of the machine bed 90 and in particular border on a working area of ​​the machine tool 100 or even extend partially into it.

[0138] The work area is preferably at least partially enclosed by an enclosure not shown in Figs. 1A and 1B.

[0139] The work spindles are rotaryally driven in the respective spindle housing aa, bb, in particular via an electric motor, in order to provide the rotation of tool 200 and / or workpiece 300 required for machining of workpieces, e.g. milling or turning.

[0140] The working spindle of the spindle devices 1, 2, wherein their spindle axes preferably and as shown in Figs. 1A and 1B, always run in a vertical plane or parallel to one such plane.

[0141] For the operation of the first spindle device 1, the first support device 10 comprises at least three linear axes, via which the first spindle device 1, attached to the first support device 10, can be moved relative to the machine bed 99 along a first direction Xi, a second direction Zi, and a third direction Yi. Preferably, the movement along the first direction Xi is carried out via a first of the at least three linear axes, the movement along the second direction Zi via a second of the at least three linear axes, and the movement along the third direction Yi via a third of the at least three linear axes.

[0142] It should be noted that the numbering of the directions is merely exemplary and was chosen based on the sequence of support elements 11, 12, 13 of the first support device 10, as described later. The designations using the letters X, Y, and Z are also only exemplary, such that Y (according to the notation commonly used in machine tool manufacturing) refers to the vertical.

[0143] For the movement of the second spindle device 2, the second support device 20 comprises at least two linear axes, preferably three linear axes, as shown in Figs. 1A and 1B, via which the second spindle device 2, attached to the second support device 20, can be moved relative to the machine bed 99 along a fourth direction X2, a fifth direction Z2, and a sixth direction Y2. Preferably, the movement along the fourth direction X2 is carried out via a first of the three linear axes, the movement along the fifth direction Z2 via a second of the three linear axes, and the movement along the sixth direction Y2 via a third of the three linear axes.

[0144] It should be noted that the numbering of the directions is merely exemplary and was chosen based on the sequence of support elements 21, 22, 23 of the second support device 20, as described later. The designations using the letters X, Y, and Z are also only exemplary, such that Y (according to the notation commonly used in machine tool manufacturing) refers to the vertical.

[0145] The first support device 10 is preferably designed such that one of the first, second, and third directions Xi, Zi, Yi always runs vertically, and the other two always run horizontally. In the case shown in Figs. 1A and 1B, the third direction Yi runs vertically by way of example. In particular, the aforementioned directions form an orthogonal direction system.

[0146] Preferably, the vertical plane to which the spindle axis of the working spindle of the first spindle device 1 runs parallel is defined by direction vectors of two of the first, second, and third directions Xi, Zi, Yi. In the case of Figs. 1A and 1B, said plane is defined by the direction vectors of the first and third directions Xi, Yi. Such an arrangement of the spindle axis is not limited to the illustrated embodiment.

[0147] In this way, the spindle axis of the working spindle of the first spindle device 1 can be easily moved in a vertically running plane and shifted parallel to it.

[0148] The second support device 20 is preferably designed such that one of the fourth, fifth, and sixth directions X2, Z2, Y2 always runs vertically, and the other two always run horizontally. In the case shown in Figs. 1A and 1B, the sixth direction Y2 runs vertically by way of example. In particular, the aforementioned directions form an orthogonal direction system.

[0149] Preferably, the vertical plane to which the spindle axis of the working spindle of the second spindle device 2 runs parallel is defined by direction vectors of two of the fourth, fifth, and sixth directions X2, Z2, Y2. In the case of Figures 1A and 1B, said plane is defined by the direction vectors of the fourth and sixth directions X2, Y2. Such an arrangement of the spindle axis is not limited to the illustrated embodiment.

[0150] In this way, the spindle axis of the working spindle of the second spindle device 2 can be easily moved in a vertically running plane and shifted parallel to it.

[0151] Preferably, each direction of the first support device 10 runs parallel to one of the fourth, fifth and sixth directions X2, Z2, Y2 of the second support device 20. In particular, the first and fourth directions Xi, X2, the second and fifth directions Zi, Z2 and the third and sixth directions Yi, Y2 each run parallel to each other.

[0152] This allows for a simple and essentially identical relative positioning, either by controlling the linear axes of the first support device 10 or by controlling the linear axes of the second support device 20. Thus, even if the tool 200 or the workpiece 300 is to be stationary relative to the machine bed 99, the machine tool 100 is not limited to a subset of possible relative positions.

[0153] For example, to change a vertical relative position between tool 200 and workpiece 300, the linear axis for the third direction Yi can be controlled if, for example, the workpiece 300 is to be stationary, or the linear axis of the sixth direction Y2 can be controlled if, for example, the tool 200 is to be stationary.

[0154] Such a possibility for relative positioning is particularly advantageous in cases where the machining of the workpiece 300 is carried out with the aid of an additional support device for the workpiece 300 provided on the machine bed 99, for example in the form of a tailstock or a steady rest.

[0155] The first spindle device 1 and the second spindle device 2 are preferably rotatably attached to the respective first and second support devices 10, 20.

[0156] The spindle housing la of the first spindle device 1 is preferably attached to the first support device 10 via a rotatable bearing, such that the first spindle device 1 can be rotated about a first axis of rotation Ci relative to the first support device 10 via a rotary axis of the first support device 10.

[0157] Furthermore, the spindle housing 2a of the second spindle device 2 is preferably attached to the second support device 20 via a rotatable bearing, such that the second spindle device 2 can be rotated about a second axis of rotation C2 relative to the second support device 20 via a rotary axis of the second support device 20.

[0158] Preferably, the first and second axes of rotation Ci, C2 always run horizontally and / or parallel to each other, as is the case in the exemplary arrangement in Fig. 1A and 1B. Preferably, the first and / or the second axis of rotation Ci, C2 each run parallel to a direction of the first, second and third direction Xi, Zi, Yi or to one of the fourth, fifth and sixth directions X2, Z2, Y2.

[0159] In the case of the first embodiment, the first and second axes of rotation Ci, C2 run parallel to the second and fifth directions Zi, Z2.

[0160] The first support device 10 comprises a first, a second and a third support element 11, 12, 13, wherein the first spindle device 1 is preferably rotatably mounted on the third support element 13 about the first axis of rotation Ci

[0161] The first support element 11 is mounted on the machine bed 99 so as to be displaceable along the first direction Xi, such that the first support element 11 can be moved relative to the machine bed 99 via the first linear axis of the first support device 10 in the first direction Xi.

[0162] The second support element 12 is mounted on the first support element 11 so as to be displaceable along the second direction Zi, such that the second support element 12 can be moved relative to the first support element 11 via the second linear axes of the first support device 10 in the second direction Zi.

[0163] The third support element 13 is mounted on the second support element 12 so as to be displaceable along the third direction Yi, such that the third support element 13 can be moved relative to the second support element 12 via the third linear axes of the first support device 10 in the third direction Yi.

[0164] Preferably, the movable bearings are implemented via guide rails 14a, 14b provided in pairs, with guide shoes engaging in these rails. In the illustrated embodiment, only the guide rails 14a, 14b attached to the second support element 12 for supporting the third support element 13 relative to the second support element 12 along the third direction Yi are provided with reference numerals.

[0165] The second support device 20 comprises a fourth, a fifth and a sixth support element 21, 22, 23, wherein the second spindle device 2 is preferably rotatably mounted on the sixth support element 23 about the second axis of rotation C2

[0166] The fourth support element 21 is mounted on the machine bed 99 so as to be displaceable along the fourth direction X2, such that the fourth support element 21 can be moved relative to the machine bed 99 via the first linear axis of the second support device 20 in the fourth direction X2.

[0167] The fifth support element 22 is slidably mounted on the fourth support element 21 along the fifth direction Z2, such that the fifth support element 22 can be moved relative to the first support element 21 via the second linear axes of the second support device 20 in the fifth direction Z2.

[0168] The sixth support element 23 is slidably mounted on the fifth support element 22 along the sixth direction Y2, such that the sixth support element 23 can be moved relative to the fifth support element 22 via the third linear axes of the second support device 20 in the sixth direction Y2.

[0169] Preferably (and as also shown in Figs. 1A and 1B) the first support element 11 and the fourth support element 21 are arranged side by side on the machine bed. Preferably and without limiting, the first support element 11 and the fourth support element 21 are slidably mounted on the same pair of guide rails which are attached to the machine bed 99.

[0170] In this way, a common guidance of the carrier devices 10, 20 can be implemented in the interface to the machine bed 99.

[0171] Furthermore, the machine tool 100 preferably includes a tailstock 30 which is attached to the machine bed 99 in order to provide additional support for workpieces 300 during machining.

[0172] For this purpose, the machine tool 100 is set up, in preparation for workpiece machining, an outer contour of the second workpiece is prepared by the work spindle. The second spindle device 2 brings the workpiece 300, in particular one end of the workpiece facing away from the receiving interface 2b of the working spindle, into contact with the tailstock 30 by means of a process of the second spindle device 2 in order to support the workpiece 300 via the tailstock 30 during workpiece machining.

[0173] Figures 1A and 1B show a state in which the workpiece 300 is supported at its workpiece end facing away from the receiving interface 2b of the work spindle by the tailstock 30, so that deflection of the workpiece 300, for example by forces acting on the obliquely engaging tool 200 (see Figures 1A and 1B), can be significantly reduced.

[0174] The suitability for use of the tailstock 30 is not limited to the second spindle device 2. The first spindle device 1, with a workpiece 300 supported by it, can also approach the tailstock 30 according to the above embodiment in order to support the workpiece 300.

[0175] Furthermore, the machine tool 100 comprises a first magazine device 50a and a second magazine device 50b, as well as the respective changing devices 60a, 60b.

[0176] The first magazine device 50a preferably comprises two parallel wheel magazines 51, each comprising a plurality of holding positions 52 in which a tool 200 or a workpiece 300 can be held. Preferably, the first magazine device 50a is associated with the first spindle device 1.

[0177] The second magazine device 50b preferably comprises two parallel wheel magazines 51, each comprising a plurality of holding positions 52 in which a tool 200 or a workpiece 300 can be held. Preferably, the second magazine device 50b is associated with the second spindle device 2.

[0178] The first tool changer 60a is preferably configured to remove a tool 200 or a workpiece 300 from each of the holding positions 52 of the plurality of holding positions 52 of the first magazine device 50a and to insert the removed workpiece 300 / tool ​​200 into the holding interface lb of the work spindle of the first spindle device 1, and is likewise configured to remove a tool 200 or a workpiece 300 from the holding interface lb of the work spindle of the first spindle device 1 and to insert the removed workpiece 300 / tool ​​200 into an empty holding position 52 of the plurality of holding positions 52 of the first magazine device 50a.

[0179] The second changing device 60b is preferably configured to remove a tool 200 or a workpiece 300 from each of the holding positions 52 of the plurality of holding positions 52 of the second magazine device 50b and to insert the removed workpiece 300 / tool ​​200 into the receiving interface 2b of the work spindle of the second Spindle device 2 is used, and is also set up to remove a tool 200 or a workpiece 300 from the receiving interface 2b of the working spindle of the second spindle device 2 and to insert the removed workpiece 300 / tool ​​200 into an empty receiving position 52 of the plurality of receiving positions 52 of the second magazine device 50b.

[0180] In this way, each of the two spindle devices 1, 2 has its own magazine device 50a, 50b with its own associated changing device 60a, 60b, which allows tool 200 and workpiece 300 to be changed in a short time.

[0181] Fig. 2A shows a second embodiment of the machine tool 100 according to the invention in a perspective view. Fig. 2B shows a corresponding enlarged section in the area of ​​the spindle devices 1, 2. Figs. 2A and 2B are described together below.

[0182] The design of the second embodiment of the machine tool 100 is essentially the same as that of the first embodiment shown in Figures 1A and 1B, so a further description of the essentially identical components is omitted here. In particular, the traverse kinematics of the first and second spindle devices are identical to those of the first embodiment.

[0183] The second embodiment differs from the first embodiment in that, in addition to the tailstock 30, a steady rest 40 is provided in the machine bed 99.

[0184] The machine tool 100 preferably includes a steady rest 40 which is attached to the machine bed 99 in order to provide additional support for workpieces 300 during machining.

[0185] For this purpose, the machine tool 100 is set up to bring an outer contour of the workpiece 300, which is held by the working spindle of the second spindle device 2, in particular an outer circumferential section of the workpiece 300, which lies between the holding interface 2b of the working spindle and a workpiece end side facing away from it, into contact with the steady rest by means of a process of the second spindle device 2, in order to support the workpiece 300 via the steady rest 40 during workpiece machining.

[0186] Figures 2A and 2B show a state in which the workpiece 300 is supported by the steady rest 40 on an outer circumferential section located between the workpiece end facing away from the receiving interface 2b of the work spindle and the receiving interface 2b, so that deflection of the workpiece 300, for example by forces acting on the obliquely engaging tool 200 (see Figures 2A and 2BB), can be significantly reduced.

[0187] The suitability for use of the steady rest 40 is not limited to the second spindle device 2. The first spindle device 1, with a workpiece 300 supported by it, can also approach the steady rest 40 according to the above embodiment in order to support the workpiece 300.

[0188] To align the steady rest 40 with the workpiece 300, the steady rest 40 is preferably slidably mounted on the machine bed 99 and includes a linear axis along which a steady rest section of the steady rest 40, which is intended to come into contact with the workpiece 300, can be moved relative to the machine bed 99. In the illustrated embodiment, said steady rest section is, by way of example and without limitation, designed as a C-shaped steady rest section.

[0189] In the second embodiment shown in Fig. 2A and 2B, the steady rest 40 can be moved horizontally in a direction parallel to a connecting line of the two magazine devices 50a, 50b (or also parallel to the first direction Xi according to Fig. 1A) in order to provide optimal support even for workpieces 300 of different lengths.

[0190] Fig. 3 schematically shows a sequence of an embodiment of the method according to the invention.

[0191] In step S1, a numerically controlled Machine tool.

[0192] The provided machine tool includes a machine bed, a first A spindle device and a second spindle device, which are movable relative to the machine bed and which each comprise a spindle housing and a work spindle rotatably mounted therein with a receiving interface in which a tool or a workpiece can be received, a first support device to which the spindle housing of the first spindle device is attached, and a second support device to which the spindle housing 2a of the second spindle device is attached.

[0193] The first support device comprises at least three linear axes, via which the first spindle device, attached to the first support device, can be moved relative to the machine bed in a first, a second, and a third direction. The second support device comprises at least two linear axes, via which the second spindle device, attached to the second support device, can be moved relative to the machine bed in a fourth and a fifth direction. Furthermore, the spindle housing of the second spindle device is attached to the second support device via a rotatable bearing, such that the second spindle device can be rotated about a second axis of rotation, which is preferably horizontal, via a rotary axis of the second support device relative to the second support device.The machine tool is at least equipped to produce a workpiece from one of the work spindles of the first or second spindle device. to machine the workpiece using a tool held by the other working spindle of the first or second spindle device.

[0194] In step S2, a workpiece held by one of the work spindles of the first or second spindle device of the machine tool provided in step S1 is machined using a tool held by the other work spindle of the first or second spindle device of the provided machine tool.

[0195] Above, exemplary embodiments of the present invention and their advantages have been described in detail with reference to the accompanying figures.

[0196] It is emphasized again that the present invention is in no way limited to the embodiments and features described above. The invention further comprises modifications of the aforementioned embodiments, in particular those resulting from modifications and / or combinations of individual or multiple features of the described embodiments within the scope of protection of the independent claims. List of reference symbols 1 first spindle device 2 second spindle device 3 third spindle device a1a, 2a, 3a spindle housing b1b, 2b, 3b mounting interface of a work spindle 10 first carrier device 11 first support element 12 second support element 13 third support element 14a, 14b Guide rails 20 second carrier device 21 fourth support element 22 fifth support element 23 sixth support element 30 tailstock 40 bezel 50a first magazine device 50b second magazine device 51 Cycling Magazine 52 magazine slots 60a first changing device 60b second changing device 99 Machine bed 100 machine tools 200 tools 300 workpieces

Claims

REQUIREMENTS 1. Numerically controlled machine tool (100) comprising: a machine bed (99); a first spindle device (1) and a second spindle device (2) movable relative to the machine bed (99), each comprising a spindle housing (1a, 1b) and a work spindle rotatably mounted therein about a spindle axis, with a receiving interface (1b, 2b) in which a tool (200) or a workpiece (300) can be received; a first support device (10) to which the spindle housing (1a) of the first spindle device (1) is attached; and a second support device (20) to which the spindle housing (2a) of the second spindle device (2) is attached; wherein the first support device (10) comprises at least three linear axes about which the first spindle device (1) attached to the first support device (10) can be moved relative to the machine bed (99) along a first, a second and a third direction;the second support device (20) comprises at least two linear axes, via which the second spindle device (2) attached to the second support device (20) can be moved relative to the machine bed (99) along a fourth and a fifth direction;the spindle housing (2a) of the second spindle device (2) is attached to the second support device (20) via a rotatable bearing, such that the second spindle device (2) can be rotated about a second axis of rotation, which preferably runs horizontally and / or orthogonally to the spindle axis of the second spindle device (2), relative to the second support device (20) via a rotary axis of the second support device (20), and wherein the machine tool (100) is at least configured to machine a workpiece (300) held by one of the working spindles of the first or the second spindle device (1, 2) by means of a tool (200) held by the respective other working spindle of the first or the second spindle device (1, 2).

2. Numerically controlled machine tool (100) according to claim 1, wherein the spindle housing (1a) of the first spindle device (1) is attached to the first support device (10) via a rotatable bearing, such that the first spindle device (1) is relative to the first support device (10) via a rotary axis of the first support device (10). The carrier device (10) can be rotated about a first axis of rotation, which preferably runs horizontally and / or orthogonally to the spindle axis of the first spindle device (1).

3. Numerically controlled machine tool (100) according to claim 2, wherein the first and second spindle device (2) are mounted on the respective first and second support device (10, 20) such that the first axis of rotation and the second axis of rotation run parallel to each other.

4. Numerically controlled machine tool (100) according to one of claims 1 to 3, wherein the first support device (10) is designed such that one direction of the first, second and third direction is vertical and one or both other directions of the first, second and third direction are horizontal, wherein the first, second and third direction preferably form an orthogonal direction system.

5. Numerically controlled machine tool (100) according to one of claims 1 to 4, wherein the first and the second support device (10, 20) are designed such that the fourth direction and the fifth direction each run parallel to one of the first, second or third directions.

6. Numerically controlled machine tool (100) according to any one of claims 1 to 5, wherein the machine tool (100) further comprises a tailstock device (30) attached to the machine bed (99), wherein the machine tool (100) is configured, in preparation for workpiece machining, to bring into contact an outer contour of a workpiece (300) received by the work spindle of the first spindle device (1), in particular an end face of the workpiece facing away from the receiving interface (1b) of the work spindle, by means of a process of the tailstock device (30) and / or a process of the first spindle device (1) with the tailstock device (30) in order to support the workpiece (300) via the tailstock device (30) during workpiece machining, and / or wherein the machine tool (100) is configured, in preparation for workpiece machining, to bring into contact an outer contour of a workpiece (300) received by the work spindle of the second spindle device (2),in particular, to bring a workpiece end side facing away from the receiving interface of the work spindle (2b) into contact with the tailstock device (30) by means of a process of the tailstock device (30) and / or a process of the second spindle device (2) with the tailstock device (30) in order to, To support the workpiece (300) during workpiece machining via the tailstock device (30).

7. Numerically controlled machine tool (100) according to any one of claims 1 to 6, wherein the machine tool (100) further comprises a steady rest device (40) attached to the machine bed (99), wherein the machine tool (100) is configured, in preparation for workpiece machining, to bring into contact an outer contour of a workpiece (300) received by the work spindle of the first spindle device (1), in particular an outer circumferential section of the workpiece (300) located between the receiving interface (lb) of the work spindle and an end face of the workpiece facing away from it, by means of a process of the steady rest device (40) and / or a process of the first spindle device (1) with the steady rest device (40) in order to support the workpiece (300) via the steady rest device (40) during workpiece machining, and / or wherein the machine tool (100) is configured,In preparation for workpiece machining, an outer contour of a workpiece (300) received by the working spindle of the second spindle device (2), in particular an outer circumferential section of the workpiece (300) which lies between the receiving interface (2b) of the working spindle and a workpiece end facing away from it, is brought into contact by a process of the steady rest device (40) and / or a process of the second spindle device (2) with the steady rest device (40) in order to support the workpiece (300) via the steady rest device (40) during workpiece machining.

8. Numerically controlled machine tool (100) according to one of claims 1 to 7, wherein the machine tool (100) further comprises a third spindle device (3) comprising a spindle housing (3a) and a work spindle rotatably mounted therein with a receiving interface (3b) in which a tool (200) or a workpiece (300) can be received, wherein the third spindle device (3) is directly attached to the machine bed (99), preferably such that the spindle housing (3a) of the third spindle device (3) is rotatably mounted on the machine bed (99) such that the third spindle device (3) can be rotated about a third axis of rotation relative to the machine bed (99) via a further rotary axis.

9. Numerically controlled machine tool (100) according to one of claims 1 to 8, wherein The first support device (10) comprises a first, a second and a third support element (11, 12, 13), wherein the first support element (11) is slidably mounted on the machine bed (99) along the first direction, in particular via guide rails (14a, 14b) attached to the machine bed (99), such that the first support element (11) can be moved relative to the machine bed (99) via a first of the at least three linear axes of the first support device (10) in the first direction, and the second support element (12) is slidably mounted on the first support element (11) along the second direction, in particular via guide rails (14a, 14b) attached to the first support element (11), such that the second support element (12) can be moved relative to the first support element (11) via a second of the at least three linear axes of the first support device (10) in the second direction.the third support element (13) is slidably mounted on the second support element (12) along the third direction, in particular via guide rails (14a, 14b) attached to the second support element (12), such that the third support element (13) can be moved relative to the second support element (12) in the third direction via a third of the at least three linear axes of the first support device (10), and the first spindle device (1) is attached to the third support element (13), 10. Numerically controlled machine tool (100) according to one of claims 1 to 8, wherein the second support device (20) comprises at least three linear axes over which the second spindle device (2) attached to the second support device (20) can be moved relative to the machine bed (99) along the fourth, fifth and a sixth direction, wherein the first and the second support device (10, 20) are preferably designed such that the sixth direction of the second support device (20) is parallel to one of the first, second or third directions.

11. Numerically controlled machine tool (100) according to one of claims 1 to 8, wherein the second support device (20) comprises a fourth and a fifth support element (21, 22), wherein the fourth support element (21) is slidably mounted on the machine bed (99) along the fourth direction, in particular via guide rails (14a, 14b) attached to the machine bed (99), such that the fourth support element (21) can be moved relative to the machine bed (99) in the fourth direction via a first of the at least two linear axes of the second support device (20), the fifth support element (22) is slidably mounted on the fourth support element (21) along the fifth direction, in particular via guide rails (14a, 14b) attached to the fourth support element (21), such that the fifth support element (22) can be moved relative to the fourth support element (21) in the fifth direction via a second of the at least two linear axes of the second support device (20), and the second spindle device (2) is attached to the fifth support element (22).

12. Numerically controlled machine tool (100) according to claim 10, wherein the second support device (20) comprises a fourth, a fifth and a sixth support element (21, 22, 23), wherein the fourth support element (21) is slidably mounted on the machine bed (99) along the fourth direction, in particular via guide rails (14a, 14b) attached to the machine bed (99), such that the fourth support element (21) can be moved relative to the machine bed (99) via a first of the at least two linear axes of the second support device (20) in the fourth direction, and the fifth support element (22) is slidably mounted on the fourth support element (21) along the fifth direction, in particular via guide rails (14a, 14b) attached to the fourth support element (21), such that the fifth support element can be moved relative to the fourth support element (21) via a second of the at least two linear axes of the second support device (20) in the fifth direction can be proceeded,the sixth support element (23) is slidably mounted on the fifth support element (25) along the sixth direction, in particular via guide rails (14a, 14b) attached to the fifth support element (22), such that the sixth support element (23) can be moved relative to the fifth (22) support element in the sixth direction via a third of the at least three linear axes of the second support device (20), and the second spindle device (2) is attached to the sixth support element (23).

13. Numerically controlled machine tool (100) according to one of claims 1 to 12, wherein the machine tool (100) is configured for 6-sided machining of a workpiece (300), a workpiece (300) held in the working spindle of the first spindle device (1) is inserted into the receiving interface (2b) of the working spindle of the second spindle device (2) for receiving there by means of a process of the first and / or the second spindle device (1, 2), and / or is configured to remove a workpiece (300) held in the working spindle of the second spindle device (2) by means of a process of the first and / or the second The spindle device (1, 2) is to be inserted into the receiving interface (lb) of the working spindle of the first spindle device (1) for receiving there.

14. Numerically controlled machine tool (100) according to one of claims 1 to 13, wherein the machine tool (100) comprises an intermediate storage location for receiving a workpiece (300), and the machine tool (100) is configured for 6-sided machining of a workpiece (300), a workpiece (300) received in the working spindle of the first spindle device (1) is inserted into the intermediate storage location by a method of the first spindle device (1) and subsequently, by a method of the second spindle device (2), the workpiece (300) received in the intermediate storage location is received into the receiving interface (2b) of the working spindle of the second spindle device (2), and / or is configured,a workpiece (300) held in the working spindle of the second spindle device (2) is inserted into the intermediate storage position by a movement of the second spindle device (2) and subsequently, by a movement of the first spindle device (1), the workpiece (300) held in the intermediate storage position is taken into the receiving interface (lb) of the working spindle of the first spindle device (1).

15. Numerically controlled machine tool (100) according to one of claims 1 to 14, wherein the machine tool (100) comprises a first magazine device (50a) which in turn comprises a plurality of receiving positions (52) in each of which a tool (200) or a workpiece (300) can be received, wherein the first magazine device (50a) comprises a wheel magazine (51) 16. Numerically controlled machine tool (100) according to claim 15, wherein the machine tool (100) comprises a first tool changer (60a) configured to remove a tool (200) or a workpiece (300) from each of the receiving positions (52) of the plurality of receiving positions (52) of the first magazine device (50a) and to insert the removed workpiece (300) / tool ​​(200) into the receiving interface (lb, 2b) of the work spindle of the first and / or the second spindle device (1, 2), and similarly configured to remove a tool (200) or a workpiece (300) from the receiving interface (lb, 2b) of the work spindle of the first and / or the second spindle device (1, 2) and to insert the removed workpiece (300) / tool ​​(200) into a receiving position (52) of the plurality of receiving positions (52) of the first magazine device (50a).

17. Numerically controlled machine tool (100) according to one of claims 15 or 16, wherein the machine tool (100) comprises a second magazine device (50b) which in turn comprises a plurality of receiving positions (52) in each of which a tool (200) or a workpiece (300) can be received, wherein the second magazine device (50b) preferably comprises a wheel magazine (51), and wherein the first magazine device (50a) is associated with the first spindle device (1) and the second magazine device (50b) is associated with the second spindle device (2).

18. Method for machining a workpiece (300), comprising: Providing a machine tool (100) according to one of claims 1 to 17; - Machining, in particular machining, of a workpiece (300) picked up by one of the working spindles of the first or the second spindle device (1, 2) of the provided machine tool (100) by means of a tool (200) picked up by the respective other working spindle of the first or the second spindle device (1, 2) of the provided machine tool (100).

Images