MACHINE TOOL WITH A WORKING SPINDLE ON AN INCLINED SURFACE

Description

[0001] The invention relates to a machine tool comprising a machine bed and a work spindle movable on the machine bed. In particular, the invention relates to a machine tool comprising several work spindles.

[0002] A machine concept with multiple work spindles is described in the applicant's application with file number DE 10 2017 209 606.3. The machine tool described therein comprises, in particular, two work spindles with clamping devices that allow, for example, a tool to be clamped on one work spindle and a workpiece to be clamped on the essentially identically designed counter spindle, or vice versa. The two work spindles are horizontally movable on a machine bed and allow horizontal workpiece machining.

[0003] A machine tool according to the preamble of claim 1 is known from DE 100 19 669 A1.

[0004] The spindle heads of the two work spindles are designed to be rotatable in the horizontal direction, so that tools or workpieces can be inserted or removed in a highly efficient manner in the horizontal direction by simply turning the spindle head towards a manipulator or tool changer.

[0005] The object of the invention is to create an optimized machine tool design that is particularly suitable for multiple spindles.

[0006] This problem is solved by a machine tool according to claim 1. The dependent claims preferably specify exemplary embodiments of the invention.

[0007] According to the invention, the machine tool has an inclined surface on its machine bed, on which guides are mounted on which a first work spindle can be moved inclinedly on the machine bed.

[0008] By providing an inclined bed according to the invention, it becomes possible to extend the positioning options of the work spindle on the machine bed. In particular, rotating the work spindle, for example in a tool change position, enables the workpiece or tool to be oriented vertically, which can significantly simplify the tool change process. Crucially, the inclined surface is arranged on the machine bed. Compared to the conventional column design, which is normally used in machine tool construction to enable guided movement of the work spindle in the direction perpendicular to the machine bed, the design of the machine bed according to the invention with an inclined surface results in a significant increase in the stability of the work spindle guidance, since the inclined surface, which is arranged directly on the machine bed, provides improved force transmission.This results in a lower load, leading to more precise positioning at lower applied bending moments.

[0009] Furthermore, the machine tool is designed as a twin-spindle machine tool, comprising two (preferably fundamentally identical) work spindles, both of which are guided on inclined surfaces. These are various inclined surfaces positioned at an angle to each other on the machine bed. This allows the two spindles to be positioned very variably relative to each other without reducing stability. In particular, the orientations of the tool and workpiece relative to each other can be achieved in a very stable manner, as is necessary, for example, in turning or grinding operations.

[0010] The machine concept according to the invention is not fundamentally limited to single spindles, but is particularly advantageous for many machining operations (milling, turning, grinding) when implemented with a working spindle and a counter spindle, both of which are positioned to be movable on an inclined surface.

[0011] In a preferred embodiment, the work spindle according to the invention is rotatable about its longitudinal axis. Preferably, the longitudinal axis about which the work spindle(s) is / are rotatable is arranged perpendicular to the direction of movement of the work spindle(s) on the inclined surface.

[0012] A further preferred embodiment is one in which the work spindle(s) is / are designed to be movable along its longitudinal axis, in particular its axis of rotation.

[0013] In a preferred embodiment, this longitudinal axis or axis of rotation of the spindles assumes an angle of 90° to the tool or workpiece clamped in the spindle nose.

[0014] The movement of the spindle in the direction of its longitudinal or rotational axis can preferably be achieved by a slide that is movable perpendicular to the slide by means of which the working spindle is guided on the inclined surface.

[0015] In machine tool configurations with multiple spindles, it has proven particularly advantageous for the spindles guided on the inclined surface to be arranged coplanarly with respect to their direction of movement, i.e., the two direction vectors of movement of the two work spindles lie in a common plane. Preferably, this plane is oriented perpendicular to the machine bed.

[0016] In a particularly simple roof bed construction of a machine tool according to the invention, the two inclined surfaces, on each of which a work spindle is movably guided, are designed as two roof surfaces with a common ridge, preferably forming an angle of 90 degrees to each other. Preferably, the spindle is mounted on a slide that is movably arranged on guides in a first direction, wherein further guides are arranged on the slide on which the work spindle mounted on the slide can be moved along an axis perpendicular to the direction of movement of the work spindle on the inclined surface.

[0017] Particular advantages arise when the angle between the roof surface and the bed surface of a first roof surface is essentially the same as the angle between the roof surface and the bed surface of a second roof surface. This achieves a symmetrical arrangement of the two traverse axes of the work spindle on the inclined surfaces, enabling simple and precise machining of the guide surfaces and ensuring symmetrical thermal expansion (thermosymmetry). Furthermore, this results in a symmetrical distribution of the travel paths, allowing for approximately equal tool / workpiece changeover times on both work spindles. This, in turn, enables more efficient and simplified programming of the machining process.

[0018] Another significant advantage of placing the work spindle on the inclined surface of the machine bed is that it allows for a vertical arrangement of workpieces and / or tools in interchangeable positions, considerably reducing the machine's footprint. This fundamentally different machine concept, compared to conventional horizontal and / or vertical arrangements, also offers a substantial improvement in workspace accessibility. Workpieces and tools are easily accessible from the outside. Furthermore, a walk-in work area is not required.

[0019] The machine concept according to the invention offers significant advantages not only in milling, but especially also in turning or grinding operations, which cannot be achieved with other concepts.

[0020] Of particular note here is the integration of a tailstock with a centering point, which can advantageously be rigidly and movingly attached to the carriage and can perform a stroke in the spindle direction.

[0021] By supporting the workpiece, a tailstock allows for the machining of larger and heavier workpieces. In the machine concept according to the invention, the tailstock does not represent an obstruction in the work area. It improves machining accuracy and enables processes with high requirements, such as workpiece concentricity, e.g., in grinding operations.

[0022] When the inclined surfaces are positioned at a 90° angle to each other, workpieces can be clamped by means of the tailstock in the machine concept according to the invention, which comprises a working spindle and a counter spindle, and machining of the side surface can be carried out by only one axis movement, so that no axis interpolation is necessary.

[0023] In general terms, the machine concept according to the invention enables entirely new clamping possibilities. For example, by mounting the workpiece with a hydraulic expansion chuck / mandrel on the HSK base body and by means of a centering tip, extremely precise concentricity of the component can be achieved, for example, during grinding operations. Due to the simple manufacturing of the guideways directly on the machine bed and the thermosymmetric behavior, extremely high geometric accuracy of the feed axes is achieved, even without software compensation.

[0024] Furthermore, short-clamping tools can be used. For example, a dressing wheel can be directly inserted into the counter spindle. This allows for the creation of very precise, universal grinding wheel contours, with any desired contour being possible due to the 5-axis positioning capability of the machine concept according to the invention. In this way, a grinding wheel can be dressed or contoured more effectively than with conventional methods.

[0025] The angle between the two roof surfaces can, in principle, be set arbitrarily. In practice, an angle of 90° is considered particularly advantageous, especially since it allows for a greater travel range in vertical alignment of the workpieces or tools in a change position for a given workpiece / tool ​​length.

[0026] In principle, any tool magazine can be used with the machine concept according to the invention. However, a particularly advantageous design results from the use of a wheel magazine, since, in addition to its high storage density, it offers the possibility of moving a workpiece or tool into a vertical exchange position in a single traversing motion. This means that a manipulator for changing the workpiece or tool into the work spindle only needs to perform a linear traversing motion combined with a short stroke to clamp or release the tools or workpieces. Furthermore, a laterally arranged wheel magazine, for example, results in a very high tool / workpiece storage density with a small footprint and simultaneously short changeover travel.

[0027] The vertical tool change position also allows for automatic loading of the tool magazine with blanks. This eliminates the need for a separate workpiece carrier for each blank. This is a significant advantage over conventional machine designs, as it enables highly efficient machining of numerous workpieces with a comparatively small number of workpiece carriers. An advantageous overall configuration of the machine tool comprises two work spindles and two tool magazines. The tool magazines are arranged parallel to each other, laterally to the two work spindles, resulting in an arrangement where the two work spindles are bordered at their ends by the tool magazines. This design allows for a high workpiece and tool density with a small footprint, while simultaneously providing good access to the actual machining area from the front.

[0028] Highly efficient workflows, enabling the throughput of a large number of workpieces in very short periods, including the associated changeover processes, are facilitated by providing an additional storage unit for tools and / or workpieces. This unit is designed to move tools and / or workpieces to a removal position from which they can be inserted into or removed from the wheel magazine. A simple and practical design for such a storage unit consists of a conveyor belt, preferably arranged parallel to the wheel magazine.

[0029] The manipulator for changing tools and / or workpieces can, in this case, include a lifting device by means of which tools and / or workpieces can be lifted from a changeover position on the conveyor belt and changed into the wheel magazine or directly into the work spindle. Combining such a storage unit with a wheel magazine as an intermediate storage unit makes it possible to significantly reduce the number of chucks required, which offers considerable cost-saving potential, especially in 6-sided machining where a workpiece carrier has a clamping and releasing function.

[0030] For example, in such a configuration, a combination of a wheel magazine and an (additional) storage unit allows the manipulator to move the clamping device to a change position within the storage unit, pick up the workpiece or tool by means of a lifting motion, and then move it, along with the clamping device, into the wheel magazine or the spindle. It is also possible, in principle, to operate without a wheel magazine as an intermediate storage unit if only 5-sided machining is required, where the workpiece does not need to be re-clamped.

[0031] In this case, where the storage unit, in particular the conveyor belt, acts as the main storage unit, only one feeder is required, although this results in a slower changeover process compared to the variant with a wheel magazine.

[0032] A machine concept optimized for raw part automation according to the present invention comprises two work spindles, each associated with a wheel magazine, and two additional storage units, each associated with a wheel magazine. The machine tool is configured to feed the tools and / or workpieces to the machining process via the first storage unit or the first wheel magazine and, after machining, to transport them away via the second storage unit or the second wheel magazine. By using, for example, the conveyor belt as a storage belt for finished parts, a very high throughput is achieved, particularly in 5-sided machining, which could not previously be realized with conventional machine concepts.Of course, even with such a design, it is possible to do without the wheel magazines, albeit with a corresponding reduction in workpiece changeover time during 5-sided machining, so that this automation concept can basically do without a wheel magazine altogether.

[0033] Further details and advantages of the present invention will become clear with reference to the figures in the following description of exemplary embodiments of the machine tool according to the invention.

[0034] They show: Figure 1 : A first embodiment of a machine tool according to the invention with a machine bed according to the invention. Figure 2 : Representation of the machine bed of the machine tool made of Figure 1 . Figure 3 : A second embodiment of a machine tool according to the invention with a machine bed according to the invention. Figure 4 The machine tool made of Figure 3in perspective top view. Figure 5 : A third embodiment of a machine tool according to the invention with a machine bed according to the invention. Figure 6a : A second embodiment of the machine bed of the machine tool made of Figure 2 . Figure 6b A third embodiment of the machine bed of the machine tool made of Figure 2 . Detailed description of the figures

[0035] Figure 1 This is a first embodiment of a machine tool according to the invention, comprising a machine bed (1) with two work spindles (8; 10) arranged on a roof structure and four wheel magazines (20; 22; 30; 31). The machine bed (1) comprises on a top surface (2) a roof with two roof surfaces, which are designed as a first inclined surface (4) and as a second inclined surface (16), on which the first work spindle (8) and the second work spindle (10) are respectively movably arranged.

[0036] The structure comprises the machine bed (1), which is designed as a roof bed, as well as a first and second structural part (45; 47) in rib-like designs, on the upper side of which two wheel magazines (20, 22; 30, 31) are arranged.

[0037] The wheel magazines (20, 22; 30, 31) hold workpieces and tools with clamping devices, or clamping devices without a workpiece or tool. The clamping devices are mounted on a circumferential surface of the wheel magazines (20, 22; 30, 31), and the clamping devices are moved into the desired position by rotating the wheel magazines (20, 22; 30, 31).

[0038] Below the two wheel magazines (20; 22) located on the top of the first structural part (45), guides (23a, 23b) are arranged on the structural part, positioned horizontally and parallel to each other. A first rod-shaped manipulator (24) is arranged on the guides (23a, 23b) and is oriented vertically. The first manipulator (24) has a gripper (25) by means of which tools or workpieces can be gripped. The first manipulator (24) moves on the guides (23a, 23b) below one of the two wheel magazines (20; 22), whereby a tool or workpiece is positioned downwards in one of the wheel magazines (20; 22) and the workpiece or tool is transferred vertically from one of the two wheel magazines (20; 22) to the first manipulator (24).After a workpiece or tool has been picked up, the first manipulator (24) can be moved on the guides (23a, 23b) so that the workpiece or tool can be transported from one of the two wheel magazines (20; 22) to the other wheel magazine (22; 20) or to the first work spindle (8). When the workpiece or tool is transferred from the first manipulator (24) to the first work spindle (8), the first work spindle (8) is moved and rotated on the first inclined surface (4) so ​​that the work spindle head is vertically aligned. In the same way that tools or workpieces are changed from one of the two wheel magazines (20; 22) into the first work spindle (8), the tools or workpieces already clamped in the first work spindle (8) can be changed.

[0039] Due to the symmetrical design of the machine tool, the loading and unloading of tools or workpieces into and out of the two wheel magazines (30; 31) on the second structural part (47) of the structure and the clamping and unclamping of tools or workpieces into and out of the second work spindle (10) are arranged in the same way as in the two wheel magazines (20, 22) on the first structural part (45) and the first work spindle (8).

[0040] By adding more wheel magazines, the storage capacity can be significantly increased while keeping the footprint small.

[0041] In Figure 2 The machine bed (1) of the machine tool according to the invention is made of Figure 1The machine bed (1) consists of a cuboid base with a top surface (2). The top surface (2) of the machine bed comprises the first inclined surface (4) and the second inclined surface (16), both of which form an angle with the top surface (2) of the machine bed (1) and meet at an intersection. The angle between the top surface (2) and the first inclined surface (4) is 45 degrees and is equal to the angle between the top surface (2) and the second inclined surface (16), resulting in a thermosymmetrical structure. The first inclined surface (4) and the second inclined surface (16) are of equal dimensions. The two inclined surfaces (4; 16) form the roof on the top surface (2) of the machine bed (1), with a first roof surface formed by the first inclined surface (4) and a second roof surface formed by the second inclined surface (16).In this embodiment, the angle between the two inclined surfaces (4; 16) is 90 degrees. The cross-sections of the top surface (2) of the machine bed and those of the two inclined surfaces (4; 16) form a triangular area. By modifying the flattening roof structure of the two inclined surfaces, a trapezoidal area can be formed from the cross-sections of the top surface and the two inclined surfaces.

[0042] On the upper surface of the first inclined surface (4), parallel guides (7) are mounted, on which a first slide (6) is movably arranged. The first slide (6) can be moved in one direction on the first inclined surface (4) by means of a motor (3) with a ball screw drive (5). Instead of the motor (3) with the ball screw drive (5), other drive types such as linear motors are possible for moving the first slide (6). The first work spindle (8) is mounted on the first slide (6) and can be moved by the first slide (6) on the first inclined surface (4). The first work spindle (8) includes a clamping device in which a workpiece (9) is clamped. In addition to workpieces (9), tools can also be clamped in the first work spindle (8).The clamping device includes a clamping / releasing function to securely and firmly clamp tools or workpieces into the clamping device or to quickly release them when necessary.

[0043] The first carriage (6) includes a tailstock (14) which is arranged perpendicular to the direction of movement of the first carriage (6) on the first inclined surface (4). A center point (12) is mounted on the tailstock (14) so ​​that the workpiece (9) clamped in the first work spindle (8) can be held in the tailstock (14) between the first work spindle (8) and the center point (12). The tailstock (14) is rigidly and movingly attached to the first carriage (6) and serves to support larger and heavier workpieces.

[0044] To further improve concentricity, a hydraulic expansion mandrel can be inserted into the first work spindle (8), which allows the rotary movements of the first work spindle (8) to be optimally transmitted to the workpiece (9). As an additional accessory for the first work spindle (8), a dressing wheel can be inserted into the first work spindle (8), enabling the creation of precise universal grinding wheel contours.

[0045] Guides (17) are mounted on the second inclined surface (16), on which a second slide (13) is arranged to move along the second inclined surface (16). The second slide (13) is driven by a motor (18) with a ball screw drive (15). Guides (33) are mounted on the second slide (13) perpendicular to the direction of movement of the second slide (13) on the second inclined surface (16), in which a second work spindle (10) is arranged to move. Thus, the second work spindle (10) can be moved along the second inclined surface by the movement of the second slide (13) and can additionally be driven by a motor (32) via the guides (33) on the second slide (13) (see in Figure 1) and a ball screw drive in a second direction, perpendicular to the direction of movement of the second work spindle (10) on the second inclined surface (16). The second slide (13) can also be operated with a linear motor instead of a ball screw drive. A tool (11) is clamped in the second work spindle (10) with which the workpiece (9) is clamped in the first work spindle (8) on the first inclined surface (4) is machined.

[0046] During a grinding operation, the workpiece (9) is held in the first work spindle (8), and the first slide (6) remains stationary on the first inclined surface (4). The second work spindle (10), in which the tool (11) is clamped, is moved by the second slide (13) on the second inclined surface (16), thereby performing grinding operations on the workpiece (9). Since the two inclined surfaces (4; 16) are perpendicular to each other at a 90-degree angle, the second work spindle (10) moves along the workpiece (9) solely by means of a drive on the second inclined surface (16), thus eliminating the need for axis interpolation to perform the movement along the workpiece (9) during the grinding operation.

[0047] In principle, both tools and workpieces can be clamped in both work spindles (8; 10). The travel paths of the first slide (6) on the first inclined surface (4) are equal to the travel paths of the second slide (13) on the second inclined surface (16), thus enabling a symmetrical distribution of the travel paths. This also results in equal changeover times when changing tools or workpieces between the two work spindles (8; 10).

[0048] The two work spindles (8; 10) are rotatable about their central axis, which is arranged perpendicular to the direction of movement of the two work spindles (8; 10) on the two inclined surfaces (4; 16). Short-clamping tools can be clamped in both work spindles (8; 10).

[0049] In Figure 3 A second embodiment of a machine tool according to the invention is shown. The machine tool has a fundamentally similar structure to the one described in Figure 1 The machine tool shown, wherein the outer wheel magazines (20; 30) are replaced by conveyor belts (37; 39) which are provided as a storage unit and the structure has been extended by a chip tray (38) and a boundary wall (41).

[0050] A first conveyor belt (37), arranged parallel to the first wheel magazine (22a) and mounted on the top of the second structural part (45), transports workpieces or tools to or from a removal position (44) on the conveyor belt (37). A lifting device (35) is positioned vertically above a workpiece placed at the removal position (44). The lifting device (35) is mounted on a frame located between the first wheel magazine (22a) and the first conveyor belt (37), so that the lifting device (35) is positioned above the removal position (44). Alternatively, the lifting device (35) can be integrated into a first manipulator (24a) instead of being mounted on the frame. When a workpiece is transferred from the first conveyor belt (37) to the first manipulator (24a), the lifting device (35), which contains a clamping element, lifts the workpiece vertically.A gripper (25a) of the first manipulator (24a) can grasp and pick up the raised clamping device including the workpiece. After the workpiece has been picked up, the first manipulator (24a) can move to the first wheel magazine (22a) or to the first work spindle (8), where the clamping device and workpiece are picked up. Clamping devices with or without workpieces can be temporarily stored in the first wheel magazine (22a).

[0051] When tools or workpieces are loaded into the first wheel magazine (22a) or the first work spindle (8), a clamping device without a workpiece is removed from the first wheel magazine (22a) by the first manipulator (24a) and transported to the lifting device (35). The lifting device (35) receives the clamping device. The tool or workpiece at the removal position (44) on the first conveyor belt (37) is clamped into the clamping device in the lifting device (35). The clamping device with the clamped workpiece is removed from the lifting device (35) by the first manipulator (24a) and can then be moved to the first wheel magazine (22a) for temporary storage of the tool or workpiece, or directly to the first work spindle (8). If the first wheel magazine (22a) is used as temporary storage, clamping devices without workpieces can be provided, so that clamping devices can be used multiple times in this described machining process.This results in a reduction of clamping devices in a machining process of the machine tool, since not every tool or workpiece requires its own clamping device.

[0052] Due to the symmetrical design of the machine tool, the loading and unloading of tools or workpieces from a second lifting device from a second conveyor belt (39), the intermediate storage of tools and workpieces in a second wheel magazine (31a), and the clamping and unloading of tools or workpieces in and out of the second work spindle (10) are arranged in the same way as the loading and unloading of tools or workpieces from the first lifting device (35) from the first conveyor belt (39), the intermediate storage of tools and workpieces in the first wheel magazine (22a), and the clamping and unloading of tools or workpieces in and out of the first work spindle (8).

[0053] The symmetrical design of the machine tool enables 6-sided machining. A workpiece, fed via the first conveyor belt (37) and machined in the first work spindle (8), is first released and then clamped in the second work spindle (10) for further machining. After machining in the second work spindle (10), the workpiece can be transported away via the second conveyor belt (39). This results in a closed-loop machining process in which workpieces are fed in for machining via the first conveyor belt (37) and transported away after machining via the second conveyor belt (39).

[0054] For a desired 5-sided machining operation, the workpiece does not need to be transferred from the first work spindle (8) to the second work spindle (10), so this machining step does not need to be carried out and the workpiece is passed on to the first conveyor belt (37) for transport after machining in the first work spindle (8) via the first manipulator (24a) and the first lifting device (35).

[0055] Chips are produced during the machining of workpieces. In the area in front of the machine bed (1), a chip tray (38) is arranged below the two work spindles (8; 10). The chips are collected in the tray during machining, preventing them from interfering with the working area of ​​the two work spindles (8; 10) or the movement of the two manipulators (24a; 27a). A boundary wall (41) is mounted vertically on the machine bed (1) from the first structural part (45) to the second structural part (47) to reduce chip fall into the machine bed (1) and concentrate the chips in the area of ​​the chip tray (38). The boundary wall (41) is aligned in the plane of the direction of movement of the two slides (6; 13).The boundary wall (41) includes recesses through which the two working spindles (8; 10) protrude, allowing the two working spindles (8; 10) to continue moving along the two inclined surfaces (4; 16). The boundary wall (41) is made of Plexiglas or a metal and is durable. However, other materials such as glass or plastic are equally suitable for use as the boundary wall (41).

[0056] In Figure 4 The machine tool according to the invention is made of Figure 3The machine tool, with its two work spindles (8; 10) movably arranged on the two inclined surfaces (4; 16), comprises the two wheel magazines (22a; 31a) that laterally define the roof bed. The first conveyor belt (37) and the second conveyor belt (39) are arranged laterally next to the wheel magazines (22a; 31a). The roof bed comprises the two inclined surfaces (4; 16), which are at a 90-degree angle to each other. Guides (7; 17) are arranged on the two inclined surfaces (4; 16), on which the two slides (6; 13) are movably mounted. The two guides (7; 17) on the two inclined surfaces (4; 16) lie on a vertical plane oriented perpendicular to the machine bed (1), so that the two slides (6; 13) move in the same line.The two work spindles (8; 10) are each mounted on one of the two slides (6; 13) and lie on the same vertical plane, with the direction vectors of motion of the two work spindles (8; 10) lying on this plane.

[0057] The in Figure 5 The machine tool according to the invention, as illustrated, basically comprises a similar structure to the one shown in Figure 3 The machine tool shown. The machine tool was configured such that it has only one conveyor belt (37a) mounted on the first structural part (45) of the machine structure and only one wheel magazine (22b) mounted on the second structural part (47) of the machine structure.

[0058] The conveyor belt (37a) transports workpieces to a removal position (44a). A manipulator (24b) has a clamping device (46) in a gripper (25b). The clamping device (46) has a clamping / releasing function, allowing workpieces to be firmly clamped into the clamping device (46) and released again as needed. The clamping device (46) is moved by the manipulator (24b) to a lifting device (35a), which vertically receives the clamping device (46). The lifting device (35a) includes a release unit in which the clamping / releasing function of the clamping device (46) can be operated. The workpiece clamped in the clamping device (46) is transported by the lifting device (35a) through the manipulator (24b) to the first work spindle (8), where the clamping device (46) is clamped to the workpiece.After machining the workpiece using the tool clamped in the second work spindle (10), the workpiece, along with the clamping device (46), is vertically transferred to the manipulator (24b). The clamping device (46) with the finished workpiece is moved to the lifting device (35a), where the workpiece is transferred to the conveyor belt (37a) and can then be transported away. During the transfer to the conveyor belt (37a), the clamping device (46) with the workpiece is picked up by the lifting device (35a). The release unit and the release function detach the workpiece from the clamping device (46) and place it vertically onto the conveyor belt (37a) in the unloading position (44a). The finished workpiece is then transported away, and a new workpiece to be machined is transported to the unloading position (44a), which is then clamped into the clamping device (46).

[0059] For machining workpieces with the machine tool, only one clamping device (46) is required for machining several workpieces.

[0060] The wheel magazine (31b) holds several tools which, during machining, are transported via a second manipulator (27b) to the second work spindle (10). The wheel magazine (31b) serves to store tools that can be clamped into the second work spindle (10).

[0061] When machining tools with the machine tool, the tools are clamped into the second work spindle (10) and the workpieces into the first work spindle (8), whereby the workpieces are machined in a 5-sided machining operation.

[0062] During processing, the workpieces are added to the processing area via the conveyor belt (37a) and transported away again after processing.

[0063] In 5-sided machining of the workpieces in the machine tool, intermediate storage of workpieces in a wheel magazine on the first structural part (45) of the machine structure is dispensed with, so that the arrangement is kept compact.

[0064] In Figure 6a is a second embodiment of the machine bed (1) made of Figure 2 The machine bed (1) is extended by mounting a first guard plate (48) on the first slide (6) between the first work spindle (8) and the first slide (6). The guard plate (48) is rigid and is attached to the first slide (6) in such a way that it moves along the first inclined surface (4) when the first slide (6) is moved.

[0065] On the second slide (13), a second guard plate (49) is arranged between the second work spindle (10) and the second slide (13). This guard plate is rigid and moves along the second inclined surface (16) as the second slide (13) is moved. The second guard plate (49) lies on a plane that is offset in depth from the plane of the first guard plate (48) so that the two guard plates (48; 49) can overlap when moving towards each other.

[0066] In addition, the machine bed was extended such that three point supports (50, 51, 52) are arranged on the underside of the machine bed (1) on which the arrangement is aligned.

[0067] In Figure 6b is a third embodiment of the machine bed (1) made of Figure 2 The machine bed (1) comprises the Figure 6a known mudguards (46; 49) and those from Figure 3 and 5The known boundary wall (41) is shown, with the machine bed (1) extending to include the combination of protective devices. The recesses in the boundary wall (41) for the two work spindles (8; 10) are concealed by the two guard plates (48, 49). The boundary wall (41) and the two guard plates (48, 49) completely protect the area behind the boundary wall (41) from chips. As shown in Figure 6a As described, the two guard plates (48, 49) are arranged offset in the plane so that the two working spindles (8; 10) can move undisturbed on the inclined surfaces (4, 16) and the two guard plates (48, 49) cannot collide with each other in the uppermost position.

Claims

1. A machine tool, comprising: - a machine bed (1), - a first work spindle (8) movable on the machine bed (1), and - a first and a second inclined surface (4, 16), which are arranged on an upper side (2) of the machine bed (1) and form an angle with the upper side (2), wherein the second inclined surface (16) is at an angle to the first inclined surface (4), wherein guides (7) are mounted on the first inclined surface (4), by means of which the first work spindle (8) is movable in a first direction on the first inclined surface (4) obliquely on the machine bed (1), characterized by a second work spindle (10) movable on the machine bed (1), which is movable on guides (17) mounted on the second inclined surface (16) in a second direction obliquely on the machine bed (1).

2. The machine tool according to claim 1, characterized in that the work spindles (8, 10) are rotatable about an axis, which is arranged perpendicular to the movement direction of the work spindles (8, 10) on the respective inclined surface (4, 16) and / or the work spindles (8, 10) are movable along an axis perpendicular to the movement direction of the work spindles (8, 10) on the respective inclined surface (4, 16).

3. The machine tool according to claim 1-2, characterized in that movement directions of at least two of the work spindles (8, 10) lie on the respective inclined surface (4, 16) in one plane.

4. A machine tool according to claim 3, characterized in that the plane runs vertically to the upper side (2) of the machine bed (1).

5. The machine tool according to claim 1-4, characterized in that a roof bed is arranged on the upper side (2) of the machine bed (1) and both roof surfaces as the inclined surfaces (4, 16) are at an angle of 90 degrees to each other.

6. The machine tool according to claim 1-5, characterized in that at least one work spindle (10) is mounted on a slide (13), which is arranged on the guides (17) movably in the first direction and that second guides (33) are arranged on the slide (13), on which the work spindle (10) mounted on the slide (13) is movable along the axis perpendicular to the movement direction of the work spindle (10) on the associated inclined surface (16).

7. The machine tool according to claim 6, characterized in that one of the slides comprises a tailstock (14) with a centering tip (12), which is movable with the slide (13) and performs a stroke in the movement direction of the work spindle (8).

8. The machine tool according to claim 1-7, characterized in that the machine tool comprises at least one wheel magazine (20) for receiving tools and / or workpieces, wherein a manipulator (24) for changing workpieces and / or tools from a changing position is arranged movably perpendicular to the circumferential surface of the wheel magazine (20) below the wheel magazine (20), wherein upon changing the tools and / or workpieces a receiving of the manipulator (24) and the changing position of the wheel magazine (20) can be brought in a vertical line.

9. The machine tool according to claim 8, characterized in that the machine tool comprises two wheel magazines (22, 31), wherein the wheel magazines (22, 31) are arranged opposite each other in parallel and the two wheel magazines (22, 31) stand laterally to the two work spindles (8, 10), so that the arrangement consisting of the two work spindles (8, 10) is laterally limited by the two wheel magazines (22, 31).

10. The machine tool according to claim 8 or 9, characterized in that the machine tool comprises at least one additional storage unit (37) for receiving tools and / or workpieces, which is adapted to bring tools and / or workpieces into a removal position (44), from which the tools and / or workpieces can be changed into the wheel magazine (22) or can be changed out of the wheel magazine (22).

11. The machine tool according to claim 10, characterized in that the storage unit (37) comprises a conveyor belt and the manipulator (24) comprises a lifting device (35), wherein the tools and / or workpieces can be moved by the conveyor belt to the removal position (44), in which the tools and / or workpieces are lifted vertically by the lifting device (35) and received by the manipulator (24), so that the tools and / or workpieces can be moved from the removal position (44) to the wheel magazine (22) or to one of the work spindles (8; 10) by the manipulator (24).

12. The machine tool according to claim 10, characterized in that the machine tool comprises two storage units (37, 39) and two and two wheel magazines (22, 31) and the machine tool is adapted to feed tools and / or workpieces via the first storage unit (37) or the first wheel magazine (22) to a machining and to transport them away after machining via the second storage unit (39) or the second wheel magazine (31).

13. The machine tool according to claim 1-12, characterized in that the arrangement with respect to geometry and position of the inclined surfaces (4, 16) and the work spindles (8, 10) is configured such that a thermosymmetrical construction of the machine tool results.