machine tool

Abstract

A machine tool comprising: - a machine bed (1), - a first work spindle (8) movable on the machine bed (1), and - a second work spindle (10) movable on the machine bed (1), wherein an upper side (2) of the machine bed (1) has a first inclined surface (4) which forms an angle with the upper side (2) and guides (7) are mounted on the first inclined surface (4), on which guides a first carriage (6) is arranged to be movable in a first direction on the first inclined surface (4), and the first work spindle (8) is mounted on the first carriage (6), wherein the upper side (2) of the machine bed (1) has a second inclined surface (16) which forms an angle with the upper side (2) and with the first inclined surface (4), such that the two inclined surfaces (4; 16) form a roof bed, and guides (17) are mounted on the second inclined surface (16), on which guides a second carriage (13) is arranged to be movable in a second direction on the second inclined surface, and the second work spindle (10) is mounted on the second carriage (13), and wherein the first work spindle (8) and the second work spindle (10) are mounted on the first carriage (6) and the second carriage (13) in such a way that the two work spindles (8, 10) are positioned at a distance from the roof bed in the horizontal direction, such that a working area of ​​the two work spindles (8, 10) is located laterally next to the roof bed.

Description

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

[0002] A machine concept with multiple work spindles is described in the applicant's application with the 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 can be moved horizontally on a machine bed, allowing horizontal workpiece machining.

[0003] 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 horizontal direction in an extremely efficient manner by simply turning the spindle head towards a manipulator or changer.

[0004] Further prior art is also known from DE 100 19 669 C2.

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

[0006] This object is achieved by a machine tool having the features of claim 1. The subclaims specify preferred embodiments of the invention.

[0007] The machine tool has an inclined surface on its machine bed on which guides are mounted on which at least one work spindle can be moved at an angle on the machine bed.

[0008] The provision of the inclined bed makes it possible to expand the positioning of the work spindle on the machine bed. In particular, by rotating the work spindle, for example in a change position, the workpiece or tool can be oriented in a vertical direction, which can significantly simplify the change process. It is important that the inclined surface is arranged on the machine bed. Compared to the conventional column design normally used in machine tool construction to enable guided movement of the work spindle in a direction perpendicular to the machine bed, the design of the machine bed 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, enables improved force introduction and / ora lower load, which leads to more precise positioning with lower applied bending moments.

[0009] The machine concept is particularly advantageous for many types of machining (milling, turning, grinding) when it is implemented with a work spindle and counter spindle, both of which are positioned so that they can move on an inclined surface.

[0010] The machine tool is designed as a double-spindle machine tool, comprising two work spindles, preferably of identical design, both of which are movably guided on inclined surfaces. These can be the same inclined surface or different inclined surfaces. In designs with two inclined surfaces positioned at an angle to each other on the machine bed, the two spindles can be positioned very variably relative to each other without reducing stability. In particular, the orientation 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.

[0011] The machine tool has a roof bed construction in which the two inclined surfaces, each of which supports a work spindle, are designed as two roof surfaces with a shared ridge, preferably at an angle of 90 degrees to each other. Preferably, the spindle is mounted on a carriage that is arranged to be movable in a first direction on guides. Further guides are arranged on the carriage, on which the work spindle mounted on the carriage can be moved along an axis perpendicular to the direction of movement of the work spindle on the inclined surface.

[0012] A first work spindle and a second work spindle of the two work spindles are mounted on their respective carriages in such a way that the two are positioned at a distance from the roof bed in the horizontal direction, such that a working area of ​​the two work spindles is located laterally next to the roof bed.

[0013] In a preferred embodiment, the work spindle is rotatable about its longitudinal axis. Preferably, the longitudinal axis about which the work spindle(s) is / are rotatable is arranged on the inclined surface perpendicular to the direction of movement of the work spindle(s).

[0014] Further preferred is an embodiment in which the work spindle(s) is / are designed to be movable along its longitudinal axis, in particular its axis of rotation.

[0015] In a preferred embodiment, this longitudinal axis or rotational axis of the spindles forms an angle of 90° to the tool or workpiece clamped in the spindle nose.

[0016] The movement of the spindle in the direction of its longitudinal or rotational axis can preferably be achieved by a carriage which can be moved perpendicular to the carriage by means of which the work spindle is guided on the inclined surface.

[0017] In machine tool designs that have multiple spindles, it has proven particularly useful if the spindles guided on the inclined surface are arranged coplanar with respect to their direction of movement, i.e., the two direction of movement vectors of the two work spindles lie in a common plane. This plane is preferably oriented perpendicular to the machine bed.

[0018] Particular advantages arise when the angle between the roof surface and the top surface of the bed of a first roof surface is essentially equal to the angle between the roof surface and the top surface of the bed of the second roof surface. This achieves a symmetrical arrangement of the two travel axes of the work spindle on the inclined surfaces, enabling simple, precise machining of the guide surfaces and ensuring symmetrical thermal expansion (thermosymmetry). Furthermore, this method achieves a symmetrical distribution of the travel paths, which enables approximately equal tool / workpiece changeover times on both work spindles, which in turn enables more efficient and simplified programming of the machining process.

[0019] 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 the workpieces and / or tools in the change position, which significantly reduces the machine's footprint. The machine concept, which is fundamentally different from the conventional horizontal and / or vertical arrangement, also significantly improves accessibility to the work area. Workpieces and tools are easily accessible from the outside. Furthermore, a walk-in work area is not necessary.

[0020] The machine concept offers significant advantages not only in milling, but also in turning and grinding operations, which cannot be achieved with other concepts.

[0021] Of particular note here is the integration of a tailstock with centering point, which can advantageously be rigidly attached to the slide and can perform a stroke in the spindle direction.

[0022] By supporting the workpiece, a tailstock allows larger and heavier workpieces to be machined. With this machine concept, the tailstock does not represent an interference contour in the work area. It improves machining accuracy and enables processes with high requirements, such as workpiece concentricity, for example, in grinding.

[0023] When the inclined surfaces are positioned at a 90° angle to each other, the machine concept comprising a work spindle and a counter spindle allows workpieces to be clamped using the tailstock and the side surface can be machined using just one axis movement, so that no axis interpolation is necessary.

[0024] Generally speaking, the machine concept enables completely new clamping options. For example, by mounting the workpiece with a hydraulic expansion chuck / mandrel on the HSK base body and using a centering point, extremely precise concentricity of the component can be achieved, for example, during grinding. The simple manufacture of the guideways directly on the machine bed and the thermosymmetric behavior result in extremely high geometric accuracy of the feed axes, even without software compensation.

[0025] In addition, short-clamping tools can be used. For example, a dressing wheel can be loaded directly into the counter spindle. This allows for the creation of highly precise, universal grinding wheel contours, with any desired contour being possible thanks to the machine's 5-axis positioning capability. This allows a grinding wheel to be dressed or contoured more effectively than with conventional methods.

[0026] 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 vertical alignment of the workpieces or tools in the change position over a larger travel range for a given workpiece / tool ​​length.

[0027] In principle, any tool storage system can be used with this machine concept. However, a particularly useful design is the use of a wheel magazine. This not only offers high storage density but also allows a workpiece or tool to be moved into a vertical change position in a single movement. This means that a manipulator only needs to perform a linear movement combined with a short stroke to clamp or release the tools or workpieces to load the workpiece or tool into the work spindle. Furthermore, a wheel magazine, for example, arranged laterally, results in a very high tool / workpiece storage density with a small footprint and short change paths.

[0028] The vertical change position also makes it possible to automatically load the wheel magazine with raw parts. This means that a workpiece carrier is no longer required for each raw part. This is a significant advantage over conventional machine concepts, as it can be carried out extremely efficiently with a comparatively small number of workpiece carriers, particularly when machining a large number of workpieces. An advantageous overall arrangement of the machine tool comprises two work spindles and two wheel magazines, with the wheel magazines arranged parallel to one another and opposite one another to the sides of the two work spindles, resulting in an arrangement in which the two work spindles are bordered at the front by the wheel magazines. This allows for a high workpiece and tool density with a small installation space, while at the same time ensuring easy access to the actual machining area from the front.

[0029] Extremely efficient workflows that allow for the throughput of a large number of workpieces in very short periods of time, including the associated changeover processes, are made possible by providing an additional storage unit for accommodating tools and / or workpieces. This storage unit is designed to move tools and / or workpieces to a removal position from which the tools and / or workpieces can be inserted into or removed from the wheel magazine. A simple and practical design of such a storage unit consists of a conveyor belt, which is preferably arranged parallel to the wheel magazine.

[0030] In this case, the manipulator for inserting and removing tools and / or workpieces can include a lifting device by means of which tools and / or workpieces can be lifted from a change position on the conveyor belt and loaded into the wheel magazine or directly into the work spindle. Combining such a storage unit with a wheel magazine as an intermediate storage device makes it possible to significantly reduce the number of required chucks, which offers significant cost-saving potential, especially in 6-sided machining where a workpiece carrier has a clamping and release function.

[0031] For example, in such a configuration comprising a combination of a wheel magazine and (additional) storage unit, the manipulator can move the clamping device into a change position of the storage unit, pick up the workpiece or tool with a lifting movement, and transfer it, complete with the clamping device, into the wheel magazine or spindle. In principle, it is also possible to work without a wheel magazine as an intermediate storage unit if only 5-sided machining is desired, which eliminates the need for re-clamping the workpiece.

[0032] In this case, in which the storage unit, in particular the conveyor belt, acts as the main storage, only one chuck is required, although a slower changing process results compared to the variant with a wheel magazine.

[0033] A machine concept optimized for raw part automation according to the present invention comprises two work spindles, each associated with a wheel magazine, as well as two additional storage units, each associated with a wheel magazine. The machine tool is configured to feed the tools and / or workpieces for machining via the first storage unit or the first wheel magazine and, after machining, to remove them via the second storage unit or the second wheel magazine. For example, by using the conveyor belt as a storage belt for finished parts, a very high partial throughput is achieved, particularly in 5-sided machining, which could not previously be achieved with conventional machine concepts.Of course, even with such a design, it is possible to dispense with the wheel magazines with a corresponding reduction in workpiece changeover time during 5-sided machining, so that this automation concept can essentially operate entirely without a wheel magazine.

[0034] Further details and advantages of the present invention will become clear from the following description of embodiments of the machine tool with reference to the figures.

[0035] They show: Fig. 1: A first embodiment of a machine tool according to the invention with a machine bed according to the invention. Fig. 2: Representation of the machine bed of the machine tool from Fig. 1. Fig. 3: A second embodiment of a machine tool according to the invention with a machine bed according to the invention. Fig. 4: The machine tool from Fig. 3 in perspective top view. Fig. 5: A third embodiment of a machine tool according to the invention with a machine bed according to the invention. Fig. 6a: A second embodiment of the machine bed of the machine tool from Fig. 2. Fig. 6b: A third embodiment of the machine bed of the machine tool from Fig. 2. Detailed description of the characters

[0036] Fig. Figure 1 shows 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 an upper side (2), a roof with two roof surfaces, which are designed as a first inclined surface (4) and a second inclined surface (16), on which the first work spindle (8) and the second work spindle (10) are movably arranged.

[0037] The structure comprises the machine bed (1), which is designed as a roof bed, and a first and second structural part (45; 47) in rib-like configurations, on the upper side of which two wheel magazines (20, 22; 30, 31) are arranged.

[0038] The wheel magazines (20, 22; 30, 31) accommodate workpieces and tools with or without clamping devices. The clamping devices are accommodated on a circumferential surface of the wheel magazines (20, 22; 30, 31), and the clamping devices are moved to a desired position by rotating the wheel magazines (20, 22; 30, 31).

[0039] Below the two wheel magazines (20; 22), which are arranged on the upper side of the first structural part (45), guides (23a, 23b) are arranged on the structural part, which are positioned horizontally and parallel to one another. A first rod-shaped manipulator (24) is arranged on the guides (23a, 23b) and is oriented in a vertical direction. 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), wherein a tool or workpiece is positioned facing downwards in one of the wheel magazines (20; 22), and a transfer of the workpiece or tool from one of the two wheel magazines (20; 22) to the first manipulator (24) is carried out vertically.After picking up a workpiece or tool, the first manipulator (24) can be moved along 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 aligned vertically. In the same way as tools or workpieces are exchanged from one of the two wheel magazines (20; 22) into the first work spindle (8), the tools or workpieces that are already clamped in the first work spindle (8) can be exchanged.

[0040] Due to a symmetrical structure of the machine tool, the loading and unloading of tools or workpieces into and from the two wheel magazines (30; 31) on the second structural part (47) of the structure and the clamping and unclamping of tools or workpieces in and from the second work spindle (10) is set up in the same way as in the two wheel magazines (20, 22) on the first structural part (45) and the first work spindle (8).

[0041] By adding additional wheel magazines, the storage capacity can be significantly increased while keeping the footprint small.

[0042] In Fig. 2, the machine bed (1) of the machine tool according to the invention is made of Fig. 1. The machine bed (1) consists of a cuboid-shaped base body with a top side (2). The top side (2) of the machine bed comprises the first inclined surface (4) and the second inclined surface (16), both of which form an angle to the top side (2) of the machine bed (1) and meet at a cutting edge. The angle between the top side (2) and the first inclined surface (4) is 45 degrees and is the same size as the angle between the top side (2) and the second inclined surface (16), resulting in a thermosymmetric structure. The first inclined surface (4) and the second inclined surface (16) are of the same size. The two inclined surfaces (4; 16) form the roof on the top side (2) of the machine bed (1) with two roof surfaces, wherein a first roof surface is formed by the first inclined surface (4) and a second roof surface is 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 side (2) of the machine bed and those of the two inclined surfaces (4; 16) form a triangular surface. By modifying the flattening roof structure of the two inclined surfaces, a trapezoidal surface can be formed from the cross-sections of the top side and the two inclined surfaces.

[0043] On the upper side of the first inclined surface (4), parallel guides (7) are mounted, on which a first carriage (6) is arranged to move. The first carriage (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 the movement of the first carriage (6). The first work spindle (8) is mounted on the first carriage (6) and can be moved by the first carriage (6) on the first inclined surface (4). The first work spindle (8) comprises 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 / release function to clamp tools or workpieces safely and firmly into the clamping device or to release them quickly when required.

[0044] The first carriage (6) comprises a tailstock (14) arranged perpendicular to the direction of movement of the first carriage (6) on the first inclined surface (4). A centering center (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 centering center (12). The tailstock (14) is rigidly and movably attached to the first carriage (6) and serves to support larger and heavier workpieces.

[0045] 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 extension device for the first work spindle (8), a dressing wheel can be inserted into the first work spindle (8), allowing precise, universal grinding wheel contours to be created.

[0046] Guides (17) are mounted on the second inclined surface (16), on which a second carriage (13) is arranged to be movable on the second inclined surface (16). The second carriage (13) is driven by a motor (18) with a ball screw drive (15). Guides (33) are mounted on the second carriage (13) perpendicular to the direction of movement of the second carriage (13) on the second inclined surface (16), in which guides a second work spindle (10) is arranged to be movable. Thus, the second work spindle (10) is movable by the movement of the second carriage (13) on the second inclined surface and can additionally be driven by the guides (33) on the second carriage (13) by a motor (32) (see in Fig. 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 carriage (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) to machine the workpiece (9), which is clamped in the first work spindle (8) on the first inclined surface (4).

[0047] During grinding, the workpiece (9) is held in the first work spindle (8) and the first carriage (6) remains stationary in one position on the first inclined surface (4). The second work spindle (10), in which the tool (11) is clamped, is moved by the second carriage (13) on the second inclined surface (16), whereby grinding work is carried out on the workpiece (9). Since the two inclined surfaces (4; 16) are perpendicular to one another at a 90 degree angle, the second work spindle (10) moves along the workpiece (9) on the second inclined surface (16) solely by means of a drive, so that during grinding no axis interpolation is necessary in order to carry out the movement along the workpiece (9).

[0048] 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 from the two work spindles (8; 10).

[0049] The two work spindles (8; 10) are rotatable about their central axes, which are arranged perpendicular to the direction of movement of the two work spindles (8; 10) on the two inclined surfaces (4; 16). Short-clamped tools can be clamped in both work spindles (8; 10).

[0050] In Fig. 3 shows a second embodiment of a machine tool according to the invention. The machine tool has a fundamentally similar structure to that shown in Fig. 1, wherein the outer wheel magazines (20; 30) are replaced by conveyor belts (37; 39) provided as a storage unit, and the structure has been extended by a chip tray (38) and a boundary wall (41).

[0051] A first conveyor belt (37), arranged parallel to the first wheel magazine (22a) and mounted on the upper side of the second structural part (45), transports workpieces or tools, which are guided to a removal position (44) on the conveyor belt (37) or transported away from the removal position (44). A lifting device (35) stands vertically above a workpiece placed on the removal position (44). The lifting device (35) is mounted on a frame arranged between the first wheel magazine (22a) and the first conveyor belt (37), such that the lifting device (35) is arranged above the removal position (44). The lifting device (35) can equally well be installed in a first manipulator (24a) instead of on the frame. When a workpiece is transferred from the first conveyor belt (37) to the first manipulator (24a), the workpiece is lifted vertically by the lifting device (35), which contains a clamping device.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).

[0052] When tools or workpieces are loaded into the first wheel magazine (22a) or into 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) picks up 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 intermediate storage of the tool or workpiece or directly to the first work spindle (8). If the first wheel magazine (22a) is used as an intermediate storage device, clamping devices without workpieces can be provided, so that clamping devices are used multiple times in the machining method described.This results in a reduction in the number of clamping devices in a machining process on the machine tool, since not every tool or workpiece requires its own clamping device.

[0053] Due to a symmetrical design of the machine tool, the picking up or removal of tools or workpieces of a second lifting device from a second conveyor belt (39), the temporary storage of tools and workpieces in a second wheel magazine (31a) and the clamping or releasing of tools or workpieces in or from the second work spindle (10) is set up in the same way as the picking up or removal of tools or workpieces of the first lifting device (35) from the first conveyor belt (39), the temporary storage of tools and workpieces in the first wheel magazine (22a) and the clamping or releasing of tools or workpieces in or from the first work spindle (8).

[0054] The symmetrical design of the machine tool enables 6-sided machining by first releasing a workpiece that has been fed in via the first conveyor belt (37) and machined in the first work spindle (8) and then clamping it into 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 circular machining process in which workpieces are fed in for machining via the first conveyor belt (37) and removed after machining via the second conveyor belt (39).

[0055] If 5-sided machining is desired, the workpiece does not have to be transferred from the first work spindle (8) to the second work spindle (10), so that this machining step does not have to be carried out and the workpiece, after machining in the first work spindle (8), is passed on to the first conveyor belt (37) for transporting away via the first manipulator (24a) and the first lifting device (35).

[0056] Chips are produced during the machining of workpieces. In the area in front of the machine bed (1), below the two work spindles (8; 10), there is a chip tray (38) in which the chips are collected during machining so that the chips do not cause any disruption in the working area of ​​the two work spindles (8; 10) or when the two manipulators (24a; 27a) are moved. A boundary wall (41) is mounted on the machine bed (1) in a vertical direction from the first structural part (45) to the second structural part (47) of the structure in order to reduce the fall of chips in the machine bed (1) and to 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 carriages (6; 13).The boundary wall (41) includes recesses through which the two work spindles (8; 10) extend, allowing them to continue moving along the two inclined surfaces (4; 16). The boundary wall (41) is made of Plexiglas or a metal and is robust. However, other materials such as glass or plastic can be used equally well as the boundary wall (41).

[0057] In Fig. 4, the machine tool according to the invention is Fig. 3 shown in a plan view. The machine tool with the two work spindles (8; 10), which are arranged such that they can move on the two inclined surfaces (4; 16), comprises the two wheel magazines (22a; 31a) which laterally delimit the roof bed, wherein 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 an angle of 90 degrees to one another. The guides (7; 17) on which the two carriages (6; 13) are mounted such that they can move are arranged on the two inclined surfaces (4; 16). The two guides (7; 17) on the two inclined surfaces (4; 16) lie on a vertical plane which is oriented perpendicular to the machine bed (1), so that the two carriages (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 movement direction vectors of the two work spindles (8; 10) lying on this plane.

[0058] The Fig. The machine tool according to the invention shown in Figure 5 basically comprises a similar structure to that shown in Fig. 3. The machine tool was configured such that the machine tool 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.

[0059] Workpieces are transported to a removal position (44a) by the conveyor belt (37a). A manipulator (24b) has a clamping device (46) accommodated in a gripper (25b). The clamping device (46) has a clamping / unclamping function, whereby workpieces can be firmly clamped in the clamping device (46) and released again as required. The clamping device (46) is moved by the manipulator (24b) to a lifting device (35a), wherein the lifting device (35a) vertically accommodates the clamping device (46). The lifting device (35a) comprises an unlocking unit in which the clamping / unclamping function of the clamping device (46) can be operated. The workpiece clamped in the clamping device (46) is transported from the lifting device (35a) by the manipulator (24b) to the first work spindle (8), where the clamping device (46) is clamped with the workpiece.After the workpiece has been machined using the tool clamped in the second work spindle (10), the workpiece is transferred vertically to the manipulator (24b) using the clamping device (46). 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 the finished workpiece can be transported away from the conveyor belt (37a). Upon transfer to the conveyor belt (37a), the clamping device (46) with the workpiece is picked up by the lifting device (35a). The unlocking unit and the release function release the workpiece from the clamping device (46) and place it vertically on the conveyor belt (37a) in the removal position (44a). The finished workpiece is removed, and a new workpiece to be machined is transported to the removal position (44), which is then clamped again in the clamping device (46).

[0060] For machining workpieces with the machine tool, only one clamping device (46) is required for machining several workpieces.

[0061] The wheel magazine (31b) accommodates several tools, which are transported to the second work spindle (10) during machining via a second manipulator (27b). The wheel magazine (31b) serves to store tools that can be clamped into the second work spindle (10).

[0062] When machining tools with the machine tool, the tools are clamped into the second work spindle (10) and the workpieces are clamped into the first work spindle (8), whereby the workpieces are machined in a 5-sided machining process.

[0063] During processing, the workpieces are added for processing by the conveyor belt (37a) and removed again after processing.

[0064] When machining the workpieces on 5 sides in the machine tool, there is no need to temporarily store workpieces in a wheel magazine on the first structural part (45) of the machine structure, so that the arrangement is kept compact.

[0065] In Fig. 6a is a second embodiment of the machine bed (1) from Fig. 2. The machine bed (1) is extended by a first protective plate (48) mounted on the first carriage (6) between the first work spindle (8) and the first carriage (6). The protective plate (48) is rigid and is attached to the first carriage (6) in such a way that it moves along the first inclined surface (4) when the first carriage (6) moves.

[0066] A second guard plate (49) is arranged on the second carriage (13) between the second work spindle (10) and the second carriage (13). This second guard plate is rigid and can be moved along the second inclined surface (16) when the second carriage (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) such that the two guard plates (48; 49) can overlap when moving toward one another.

[0067] In addition, the machine bed was extended in such a way that three point supports (50, 51, 52) are arranged on the underside of the machine bed (1), on which the arrangement is aligned.

[0068] In Fig. 6b is a third embodiment of the machine bed (1) from Fig. 2. The machine bed (1) comprises the Fig. 6a known mudguards (48; 49) and those from Fig. 3 and Fig. 5 known boundary wall (41), with the machine bed (1) showing the combination of protective devices as an extension. The recesses in the boundary wall (41) for the two work spindles (8; 10) are covered by the two protective plates (48, 49). The area behind the boundary wall (41) is completely protected from chips by the boundary wall (41) and the two protective plates (48, 49). As shown in Fig. 6a, the two protective plates (48, 49) are arranged offset in the plane so that the two work spindles (8; 10) move on the inclined surfaces without interference on the two inclined surfaces (4, 16) and the two protective plates (48, 49) cannot collide with each other in the uppermost position.

[0069] The invention is not limited to the Fig.1-6, but includes further combinations of the details presented in the description to create further embodiments created by the knowledge of the person skilled in the art.

Claims

[1] A machine tool comprising: - a machine bed (1), - a first work spindle (8) movable on the machine bed (1), and - a second work spindle (10) movable on the machine bed (1), wherein an upper side (2) of the machine bed (1) has a first inclined surface (4) which forms an angle with the upper side (2) and guides (7) are mounted on the first inclined surface (4), on which guides a first carriage (6) is arranged to be movable in a first direction on the first inclined surface (4), and the first work spindle (8) is mounted on the first carriage (6), wherein the upper side (2) of the machine bed (1) has a second inclined surface (16) which forms an angle with the upper side (2) and with the first inclined surface (4), such that the two inclined surfaces (4; 16) form a roof bed, and guides (17) are mounted on the second inclined surface (16), on which guides a second carriage (13) is arranged to be movable in a second direction on the second inclined surface, and the second work spindle (10) is mounted on the second carriage (13), and wherein the first work spindle (8) and the second work spindle (10) are mounted on the first carriage (6) and the second carriage (13) in such a way that the two work spindles (8, 10) are positioned at a distance from the roof bed in the horizontal direction, such that a working area of ​​the two work spindles (8, 10) is located laterally next to the roof bed. [2] A machine tool according to claim 1, characterized bythat the work spindle(s) (8; 10) is / are rotatable about an axis which is arranged perpendicular to the direction of movement of the work spindle(s) (8; 10) on the inclined surface (4). [3] Machine tool according to claim 1 or 2, characterized by that the two work spindles (8; 10) can be moved along an axis perpendicular to the direction of movement of the work spindle(s) (8; 10) on the two inclined surfaces (4; 16). [4] A machine tool according to claim 1-3, characterized by that the directions of movement of the two working spindles (8; 10) on the two inclined surfaces (4; 16) lie in one plane. [5] A machine tool according to claim 4, characterized by that the plane runs vertically to the top side (2) of the machine bed (1). [6] A machine tool according to claims 1-5, characterized by that the two roof surfaces are inclined surfaces (4; 16) at an angle of 90 degrees to each other. [7] A machine tool according to claims 1-6, characterized by that second guides (33) are arranged on the second carriage (13), on which guides the second work spindle (10) mounted on the second carriage (13) can be moved along the axis perpendicular to the direction of movement of the work spindle (10) on the second inclined surface (16). [8] Machine tool according to claim 7, characterized by that one of the slides (6; 13) comprises a tailstock (14) with a centering point (12), which can be moved with this slide (6; 13) and performs a stroke in the direction of movement of the respective work spindle (8; 10). [9] Machine tool according to claims 1-8, characterized byin 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 is arranged below the wheel magazine (20) so as to be movable from a changing position perpendicular to the circumferential surface of the wheel magazine (20), wherein when changing the tools and / or workpieces, a holder of the manipulator (24) and the changing position of the wheel magazine (20) can be brought into a vertical line. [10] Machine tool according to claim 9, characterized by that the machine tool comprises two work spindles (8; 10) and two wheel magazines (22; 31), wherein the wheel magazines (22; 31) are arranged parallel to one another and opposite one another and the two wheel magazines (22; 31) are located laterally to the two work spindles (8; 10), so that the arrangement consisting of the two work spindles (8; 10) is laterally delimited by the two wheel magazines. [11] Machine tool according to claim 9 or 10, characterized by that the machine tool comprises at least one additional storage unit (37) for receiving tools and / or workpieces, which is designed to move tools and / or workpieces into a removal position (44) from which the tools and / or workpieces can be exchanged into the wheel magazine or exchanged from the wheel magazine (22). [12] Machine tool according to claim 11, characterized byin 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 picked up 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 the work spindle (8) by the manipulator (24). [13] Machine tool according to claim 11, characterized bythat the machine tool comprises two storage units (37; 39), two work spindles (8; 10) and two wheel magazines (22; 31) and the machine tool is designed to supply tools and / or workpieces for processing via the first storage unit (37) or the first wheel magazine (22) and to transport them away after processing via the second storage unit (39) or the second wheel magazine (31). [14] Machine tool according to claims 1-13, characterized by that on the upper side (2) of the machine bed (1) two inclined surfaces (4; 16) are provided, on each of which inclined surfaces (4; 16) a work spindle (8; 10) moves, wherein the arrangement with regard to the geometry and position of the inclined surface (4; 16) and the work spindle (8; 10) is designed in such a way that a thermosymmetrical construction of the machine tool results.

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