Machine tool

Abstract

The invention relates to a machine tool (1) comprising: - a machine frame (4); - a first work spindle (5); - a second work spindle (6); and - a workpiece clamping device (38) having a first workpiece receiving space (59), which is designed to receive at least one first workpiece (2). The first work spindle (5) can be moved along the X-axis (10) by means of a first X-axis adjustment unit (17), and the second work spindle (6) can be moved along the X-axis (10) by means of a second X-axis adjustment unit (18). The first work spindle (5) can be moved along the Z-axis (9) by means of a first Z-axis adjustment unit (25); the second work spindle (6) can be moved along the Z-axis (9) by means of a second Z-axis adjustment unit (26), said first work spindle (5) and second work spindle (6) being movable independently of one another along the Z-axis (9); and the first workpiece receiving space (59) can be moved along a vertical Y-axis (11) by means of a Y-axis adjustment unit (58).

Description

[0001] MACHINE TOOL

[0002] The invention relates to a machine tool.

[0003] US2021060666A1 discloses a machine tool with four horizontally aligned work spindles arranged side by side. The four work spindles are arranged on a common spindle adjustment device.

[0004] The machine tool of US2021060666A1 has the disadvantage that it has only limited flexibility with regard to the machining of different workpieces.

[0005] To increase the flexibility of a machine tool, the number of drives can be increased. However, increasing the number of drives simultaneously increases the complexity of the machine tool. Due to the almost infinite number of possible machine tool configurations, finding an optimal configuration that offers sufficient flexibility for specific workpieces while maintaining the lowest possible complexity is very complex.

[0006] The object of the present invention was to overcome the disadvantages of the prior art and to provide a machine tool that exhibits increased flexibility. At the same time, the increased flexibility of the machine tool is intended to keep its complexity low.

[0007] This task is solved by a machine tool according to the requirements.

[0008] According to the invention, a machine tool is designed. The machine tool comprises:

[0009] - a machine frame;

[0010] - a first working spindle which is rotatably mounted about a first spindle axis, wherein the first spindle axis is arranged parallel to a horizontal Z-axis;

[0011] - a second work spindle which is rotatably mounted about a second spindle axis, wherein the second spindle axis is arranged parallel to the horizontal Z-axis, wherein the first work spindle and the second work spindle are arranged next to each other at a distance from each other in a horizontal X-axis;

[0012] - a workpiece clamping device with a first workpiece holding position, which is designed to hold at least one first workpiece,

[0013] The first working spindle is displaceable along the X-axis by means of a first X-axis adjustment unit, and the second working spindle is displaceable along the X-axis by means of a second X-axis adjustment unit, wherein the first working spindle and the second working spindle are displaceable independently of each other along the X-axis, and wherein the first working spindle is displaceable along the Z-axis by means of a first Z-axis adjustment unit, and the second working spindle is displaceable along the Z-axis by means of a second Z-axis adjustment unit, and wherein the first working spindle and the second working spindle are displaceable independently of each other along the Z-axis, and wherein the first workpiece holding position is displaceable along a vertical Y-axis by means of a Y-axis adjustment unit.

[0014] The machine tool according to the invention offers the surprising advantage that, despite increasing the flexibility of the machine tool, the number of necessary drives can be kept as low as possible, thus keeping the complexity of the machine tool low.

[0015] In particular, it can be stipulated that the first and second work spindles are not movable along a vertical Y-axis. This is unnecessary, however, because the first workpiece holding position can be moved along a vertical Y-axis by means of a Y-axis adjustment unit. This allows for a surprising improvement in machining accuracy compared to a concept in which the first and second work spindles are movable along a vertical Y-axis.

[0016] Furthermore, it can be advantageous if the first work spindle can be moved along the X-axis exclusively by means of the first X-axis adjustment unit, and the second work spindle can be moved along the X-axis exclusively by means of a second X-axis adjustment unit. This has the advantage that additional drives can be saved. In particular, it can be provided that the first work spindle and the second work spindle can each be moved over their entire intended working range by means of their respective X-axis adjustment units.This offers significant advantages over designs where the first and second work spindles are moved together by means of an X-axis adjustment unit, and where further X-axis adjustment units are required between the first and second work spindles to compensate for any expansion or other adjustments. Furthermore, the workpiece clamping device can include a second workpiece holding position, which is designed to hold a second workpiece. The first and second workpiece holding positions can be moved together along the vertical Y-axis by means of a Y-axis adjustment unit. This offers the advantage that a second workpiece can be held in the workpiece clamping device, allowing the first and second workpieces to be machined parallel to or simultaneously with each other.In particular, this measure can increase the efficiency of the machine tool while simultaneously keeping the complexity of the machine tool or the complexity requirement for the control of the machine tool low.

[0017] In particular, it may be provided that each of the work spindles is assigned its own workpiece holding station.

[0018] Furthermore, the workpiece clamping device can be provided with a third workpiece holding position, which is designed to hold a third workpiece. The first, second, third, and fourth workpiece holding positions can all be moved together along the vertical Y-axis by means of a Y-axis adjustment unit. This offers the advantage that a third and a fourth workpiece can be held on the workpiece clamping device, and that the first, second, third, and fourth workpieces can be machined in parallel or simultaneously. In particular, this measure can increase the efficiency of the machine tool while simultaneously minimizing the complexity of the machine tool and the complexity requirements for its control system.

[0019] Furthermore, the first workpiece holding position can be arranged on a workpiece table that is pivotally mounted about a swivel axis, with the swivel axis being aligned parallel to a horizontal X-axis, and the workpiece table being displaceable along a vertical Y-axis by means of the Y-axis adjustment unit. This offers the advantage of increasing the flexibility of the machine tool without excessively increasing its complexity. Additional workpiece holding positions can also be arranged on the workpiece table.

[0020] Furthermore, it may be provided that at least one swivel motor is designed, by means of which the workpiece table can be swivelled around the first swivel axis.

[0021] Another advantageous configuration is one in which the first and second workpiece holding positions are arranged on the workpiece table. This offers the benefit of increasing the flexibility of the machine tool without excessively increasing its complexity.

[0022] Furthermore, it can be provided that the first, second, third, and fourth workpiece holding positions are arranged on the workpiece table. This has the advantage of increasing the flexibility of the machine tool without excessively increasing its complexity. Moreover, this measure allows for optimal utilization of the machining area.

[0023] According to a further development, it is possible to have a third working spindle rotatably mounted about a third spindle axis, with the third spindle axis arranged parallel to the horizontal Z-axis and the third working spindle positioned next to the first working spindle; and a fourth working spindle rotatably mounted about a fourth spindle axis, with the fourth spindle axis arranged parallel to the horizontal Z-axis and the fourth working spindle positioned next to the second working spindle. This offers the advantage of increasing both the flexibility and efficiency of the machine tool.

[0024] Furthermore, it can be provided that the first work spindle is assigned to the first workpiece holding position on the workpiece table, that the second work spindle is assigned to the second workpiece holding position on the workpiece table, that the third work spindle is assigned to the third workpiece holding position on the workpiece table, and that the fourth work spindle is assigned to the fourth workpiece holding position on the workpiece table. It can also be provided that the first work spindle is coupled to a first spindle drive for rotating the work spindle about the first spindle axis. In particular, it can be provided that the first spindle drive is designed as a motor spindle.

[0025] Furthermore, it may be provided that the second work spindle is coupled to a second spindle drive for rotating the work spindle about the second spindle axis. In particular, it may be provided that the second spindle drive is designed as a motor spindle.

[0026] Furthermore, it may be provided that the third working spindle is coupled to a third spindle drive for rotating the working spindle about the third spindle axis. In particular, it may be provided that the third spindle drive is designed as a motor spindle.

[0027] Furthermore, it may be provided that the fourth work spindle is coupled to a fourth spindle drive for rotating the work spindle about the fourth spindle axis. In particular, it may be provided that the fourth spindle drive is designed as a motor spindle.

[0028] Furthermore, it can be provided that the individual working spindles can be driven individually and independently of each other.

[0029] Furthermore, it can be advantageous if the first and third work spindles can be moved together along the X-axis using the first X-axis adjustment unit, and if the second and fourth work spindles can be moved together along the X-axis using the second X-axis adjustment unit. This offers the advantage of keeping the machine tool's complexity low while maintaining high flexibility.

[0030] Furthermore, it can be provided that the third work spindle is movable along the X-axis relative to the first work spindle by means of a first X-axis compensation unit, and that the fourth work spindle is movable along the X-axis relative to the second work spindle by means of a second X-axis compensation unit. This offers the advantage of further increasing the flexibility of the machine tool. At the same time, it is not necessary for the third and fourth work spindles to be movable separately across the entire operating range of the X-axis. This is particularly advantageous if the first and third work spindles are assigned to the first workpiece holding station, and the second and fourth work spindles are assigned to the second workpiece holding station.

[0031] In an alternative design variant, the first work spindle can be moved along the X-axis by means of the first X-axis adjustment unit, the third work spindle can be moved along the X-axis by means of a third X-axis adjustment unit, the second work spindle can be moved along the X-axis by means of a second X-axis adjustment unit, and the fourth work spindle can be moved along the X-axis by means of a fourth X-axis adjustment unit, whereby the first, second, third, and fourth work spindles can be moved independently of each other along the X-axis. This measure can further increase the flexibility of the machine tool.

[0032] Furthermore, it can be provided that the third work spindle is displaceable along the Z-axis by means of a third Z-axis adjustment unit, and the fourth work spindle is displaceable along the Z-axis by means of a fourth Z-axis adjustment unit, wherein the first work spindle, the second work spindle, the third work spindle, and the fourth work spindle are displaceable independently of each other along the Z-axis. This measure can further increase the flexibility of the machine tool.

[0033] Furthermore, it may be provided that the first Z-axis adjustment unit is mounted on the first Z-axis adjustment unit by means of a first Z-axis guide. Furthermore, it may be provided that the second Z-axis adjustment unit is mounted on the second X-axis adjustment unit by means of a second Z-axis guide. Furthermore, it may be provided that the third Z-axis adjustment unit is mounted on the first X-axis adjustment unit by means of a third Z-axis guide. Furthermore, it may be provided that the fourth Z-axis adjustment unit is mounted on the second X-axis adjustment unit by means of a fourth Z-axis guide.

[0034] Furthermore, it may be provided that the first Z-axis adjustment unit is adjustable relative to the first X-axis adjustment unit by means of a first Z-axis drive unit. Furthermore, it may be provided that the second Z-axis adjustment unit is adjustable relative to the second X-axis adjustment unit by means of a second Z-axis drive unit. Furthermore, it may be provided that the third Z-axis adjustment unit is adjustable relative to the first or third X-axis adjustment unit by means of a third Z-axis drive unit. Furthermore, it may be provided that the fourth Z-axis adjustment unit is adjustable relative to the second or fourth X-axis adjustment unit by means of a fourth Z-axis drive unit.In particular, it can be provided that the individual working spindles can be moved individually and independently of each other along the Z-axis by means of the individual Z-axis drive units.

[0035] Furthermore, it can be provided that the individual working spindles can be individually and independently pivoted around the Y-axis by means of a swivel bearing. This further increases the flexibility of the machine tool.

[0036] The individual Z-axis guides can each have guide rails which are arranged on the respective X-axis adjustment unit and can have guide carriages which are each arranged on the Z-axis adjustment unit.

[0037] Furthermore, it may be provided that a first X-axis guide rail and a second X-axis guide rail are formed on the machine frame, wherein the first X-axis guide rail and the second X-axis guide rail are spaced apart from each other in the Z-axis on the machine frame, wherein the first X-axis adjustment unit is slidably mounted on the first X-axis guide rail by means of at least one first guide slide and is slidably mounted on the second X-axis guide rail by means of at least one further first guide slide, and wherein the second X-axis adjustment unit is mounted on the first X-axis guide rail by means of at least one second guide slide and is slidably mounted on the second X-axis guide rail by means of at least one further second guide slide.This has the advantage that a simple and stable design of the machine tool can be achieved through this measure, which allows the machine tool to have a high machining accuracy.

[0038] Another advantageous configuration is one in which the third X-axis adjustment unit is slidably mounted on the first X-axis guide rail by means of at least one third guide slide, and slidably mounted on the second X-axis guide rail by means of at least one further third guide slide. Similarly, the fourth X-axis adjustment unit is slidably mounted on the first X-axis guide rail by means of at least one fourth guide slide, and slidably mounted on the second X-axis guide rail by means of at least one further fourth guide slide. This measure further increases the flexibility of the machine tool. "Additional third guide slides" refers to additional guide slides for the third X-axis adjustment unit. For simplicity, the number preceding the guide slide designation indicates its assignment to the respective X-axis guide rails.

[0039] V production units.

[0040] Furthermore, it can be provided that the individual X-axis adjustment units are each coupled with four guide slides, with two of the guide slides of the respective X-axis adjustment unit being slidably mounted on the first X-axis guide rail and two of the guide slides of the respective X-axis adjustment unit being slidably mounted on the second X-axis guide rail.

[0041] According to a further development, it is possible for a third X-axis guide rail and a fourth X-axis guide rail to be formed on the machine frame, wherein the first X-axis guide rail, the second X-axis guide rail, the third X-axis guide rail and the fourth X-axis guide rail are each spaced apart from each other in the Z-axis on the machine frame, wherein the third X-axis adjustment unit is slidably mounted on the third X-axis guide rail by means of at least one third guide slide and is slidably mounted on the fourth X-axis guide rail by means of at least one further third guide slide, and that the fourth X-axis adjustment unit is slidably mounted on the third X-axis guide rail by means of at least one fourth guide slide and is slidably mounted on the fourth X-axis guide rail by means of at least one further fourth guide slide.This has the advantage that the individual work spindles can be moved closer together, thereby further increasing the possible machining area of ​​the individual work spindles.

[0042] Furthermore, it can be advantageous for the workpiece table to be rotatably mounted on the machine frame by means of a first pivot bearing and a second pivot bearing, wherein the Y-axis adjustment unit has a first mounting which is guided on at least one Y-axis guide rail and a second mounting which is guided on at least one second Y-axis guide rail, the first pivot bearing being arranged on the first mounting and the second pivot bearing being mounted on the second mounting. This measure allows the necessary mobility of the tool table, both in terms of its pivoting ability and its adjustability in the direction of the Y-axis, to be easily achieved.

[0043] Furthermore, the first Y-axis guide rail may be arranged on the machine frame. Furthermore, the second Y-axis guide rail may be arranged on the machine frame. Furthermore, first mounting guide slides may be arranged at the first mounting point, which interact with the first Y-axis guide rail. Furthermore, second mounting guide slides may be arranged at the second mounting point, which interact with a second Y-axis guide rail.

[0044] Furthermore, it can be provided that the first fixture is movable along the vertical Y-axis by means of a first Y-drive motor, and that the second fixture is movable along the vertical Y-axis by means of a second Y-drive motor. This offers the advantage of enabling easy movement of the workpiece table. In particular, it can be provided that the first Y-drive motor and the second Y-drive motor are electrically synchronized with each other. Specifically, it can be provided that the first Y-drive motor and the second Y-drive motor are controlled synchronously with each other.Synchronization of the first Y drive motor and the second Y drive motor can be achieved, for example, by providing a separate displacement measuring system for the first and second recordings to determine the current position of the first and second recordings in the Y direction.

[0045] Furthermore, it can be provided that the first Y-drive motor is coupled to a first ball screw and that a first screw nut is arranged in the first receptacle.

[0046] Furthermore, it may be provided that the second Y-drive motor is coupled to a second ball screw and that a second spindle nut is arranged in the second receptacle.

[0047] Furthermore, it can be advantageous to assign the first and third work spindles to the first workpiece clamping station and the second and fourth work spindles to the second workpiece clamping station. This offers the advantage of enabling the efficient machining of two workpieces simultaneously. Such a configuration is particularly useful when using four work spindles with two workpiece clamping stations.

[0048] Furthermore, it can be provided that the first workpiece holding station comprises a first rotary table by means of which the first workpiece is rotatably mounted about a first axis of rotation arranged perpendicular to the swivel axis of the workpiece table, and that the second workpiece holding station comprises a second rotary table by means of which the second workpiece is rotatably mounted about a second axis of rotation arranged perpendicular to the swivel axis of the workpiece table. This has the advantage that the flexibility of the machine tool can be further improved by this measure.

[0049] Furthermore, it can be provided that the first axis of rotation and the second axis of rotation are arranged parallel to each other.

[0050] Furthermore, it can be provided that two of the first working spindles are arranged one above the other on the first Z-axis adjustment unit, and that two of the second working spindles are arranged one above the other on the second Z-axis adjustment unit. This has the advantage that the efficiency of the machine tool can be increased. In particular, it can be provided that the two first working spindles arranged one above the other are positioned at a fixed distance from each other.

[0051] Furthermore, it can be provided that the third workpiece holding position includes a third rotary table, by means of which the third workpiece is rotatably mounted about a third axis of rotation arranged perpendicular to the swivel axis of the workpiece table, and that the fourth workpiece holding position includes a fourth rotary table, by means of which the fourth workpiece is rotatably mounted about a fourth axis of rotation arranged perpendicular to the swivel axis of the workpiece table. This has the advantage that the flexibility of the machine tool can be further improved by this measure.

[0052] Furthermore, the machine tool may be designed as follows. The machine tool comprises: a machine frame; at least one first work spindle, which is rotatably mounted about a first spindle axis, wherein the first spindle axis is arranged parallel to a horizontal Z-axis; a workpiece clamping device, which is designed to hold at least one first workpiece; a tool magazine for storing different machining tools, wherein the tool magazine provides at least one storage level with several adjacent tool holding positions.

[0053] The tool holding positions are aligned parallel to the horizontal Z-axis, with the machining tools being aligned parallel to the horizontal Z-axis in the tool magazine, and with the individual tool holding positions being arranged next to each other spaced apart in a horizontal X-axis.

[0054] The machine tool according to the invention offers the advantage that tool changes can be carried out easily through these measures. Furthermore, the machine tool can have a simple design.

[0055] If the machining tools are held in the tool magazine parallel to the horizontal Z-axis, this means that one axis of rotation of the respective machining tool lies parallel to the horizontal Z-axis.

[0056] The horizontal orientation of the tool holders allows tools to be easily placed in them and held in place by gravity. Therefore, complex holders are not necessary.

[0057] Furthermore, it can be advantageous to arrange several tool holders in the tool magazine in a staggered arrangement along the Z-axis. This offers the benefit of increasing the storage capacity of the tool magazine.

[0058] Furthermore, the tool holders can be designed to have a longitudinal extension in the Z-axis, with the longitudinal extension of at least some of the tool holders arranged in series being adjustable. This offers the advantage of making the best possible use of the available space in the tool magazine to accommodate as many machining tools as possible. The longitudinal extension of the tool holders defines the maximum tool length that can be accommodated. The tool length of the machining tool to be accommodated at a tool holder is therefore preferably shorter than the longitudinal extension of the tool holder in which the machining tool is to be held. In particular, the longitudinal extension of the tool holders can be adapted to the tool length of the longest machining tool to be accommodated.

[0059] In particular, it may be provided that different machining tools with different tool lengths are arranged in a row. Furthermore, it may be provided that individual machining tools extend across two or more tool holders. Naturally, no tool can be held in the corresponding tool holder into which a tool extends.

[0060] Furthermore, the tool magazine can be provided with a first receiving comb and a second receiving comb, wherein the first receiving comb has first receiving recesses and the second receiving comb has second receiving recesses, wherein the first receiving comb and the second receiving comb are arranged at a distance from each other along the horizontal Z-axis, with one of the first receiving recesses serving to hold a first machining tool and one of the second receiving recesses serving to hold a further machining tool. Such a design has the advantage that the machining tool can simply be placed in the receiving combs and no other positive-locking connection is required to stabilize the machining tools during placement.The receiving combs can engage with the machining tools in such a form-fitting manner that the machining tools can be held stably in the receiving combs. In particular, it can be provided that the machining tools each have a groove corresponding to the receiving comb.

[0061] In particular, it may be provided that the first receiving comb and the second receiving comb are arranged at such a distance from each other that a first of the machining tools can be received in the first receiving comb and that the second receiving comb does not obstruct the first machining tool.

[0062] It is also advantageous to have the first and / or second tool holders be designed to be displaceable along the horizontal Z-axis relative to the machine frame. This allows the longitudinal extent of the tool holders to be adjusted so that it can be adapted to the length of the tools being held, ensuring that the longitudinal extent is no greater than the length of the longest tool. In particular, the longitudinal extent of the tool holders can be defined by the distance between the first and second tool holders.

[0063] In particular, it may be provided that the individual receiving combs are designed to be individually and independently movable along the horizontal Z-axis relative to the machine frame.

[0064] According to a further development, it is possible for the first tool holder to be arranged on a tool holder, with the tool holder being positioned above the first working spindle and designed to be displaceable along the horizontal Z-axis. In particular, the tool holder can simultaneously form part of the enclosure of the machining area of ​​the machine tool. This offers the advantage that the first tool holder can be moved by means of the tool holder. If the tool holder forms part of the machining area enclosure of the machine tool, the machine tool can have a simple and efficient design. Specifically, it can be achieved that when the tool holder is moved along the horizontal Z-axis, the machining area enclosure of the machine tool is opened, thus making the machine tool accessible for tool changes.

[0065] Furthermore, it can be provided that the longitudinal extent of at least two tool mounting positions arranged side by side with respect to the horizontal Z-axis is independently adjustable. This has the advantage that the same longitudinal extent does not have to be set across the entire width of the tool magazine. Thus, the available space in the tool magazine can be used more efficiently.

[0066] Furthermore, it can be advantageous for the tool magazine to include a third and a fourth tool holder, wherein the third tool holder has three tool holder recesses and the fourth tool holder has four tool holder recesses, wherein the third tool holder is arranged horizontally spaced next to the first tool holder and the fourth tool holder is arranged horizontally spaced next to the second tool holder, and wherein the first, second, third, and fourth tool holders are designed to be independently displaceable along the horizontal Z-axis relative to the machine frame. This measure can further increase the flexibility of the machine tool.

[0067] Furthermore, it can be provided that at least two of the mounting recesses are arranged next to each other for each working spindle. This offers the advantage that one machining tool can be placed in one of the mounting recesses for each working spindle, and another machining tool can be picked up from one of the mounting recesses.

[0068] Furthermore, it may be provided that a tool changing device is designed for changing the machining tools. It may also be provided that the tool changing device includes a first gripping device.

[0069] The first gripping device can have a first gripping unit and a second gripping unit. The first gripping unit and the second gripping unit can be spaced apart from each other with respect to the X-axis by a first gripping unit distance.

[0070] In particular, it may be provided that the first gripping unit spacing is equal to the spacing of the individual receiving recesses or a multiple of the spacing of the individual receiving recesses.

[0071] Furthermore, it can be provided that the first gripping device is assigned to the first working spindle. In particular, it can be provided that a first of the machining tools, which is clamped in the first working spindle, can be removed by means of the first gripping unit and subsequently a second of the machining tools, which is held in the second gripping unit, can be inserted into the first working spindle.

[0072] In particular, it may be provided that the first gripping unit and the second gripping unit are aligned in such a way that the machining tools can be received in the respective gripping unit in a manner parallel to the Z-axis.

[0073] Furthermore, it may be provided that a second gripping device is mounted on the gripping device carrier, which has a third gripping unit and a fourth gripping unit. The third and fourth gripping units may be spaced apart from each other along the X-axis by a distance of two gripping units. The function and dimensions of the second gripping device may be identical to those of the first gripping device. It may also be provided that the second gripping device is assigned to the second working spindle.

[0074] Furthermore, it may be provided that the first gripping device and the second gripping device are arranged at a gripping device distance from each other.

[0075] Furthermore, it may be provided that a third gripping device and a fourth gripping device are arranged on the gripping device carrier.

[0076] The third gripping device can be assigned to the third work spindle. The fourth gripping device can be assigned to the fourth work spindle. The third and fourth gripping devices can be configured identically to the first gripping device and each also have two gripping units.

[0077] Furthermore, the tool changing device may include a gripping head. The gripping device carrier may be slidably arranged along the X-axis on the gripping head. In particular, the gripping device carrier may be coupled to a gripping device carrier rail, which is slidably mounted in a gripping head slide. The gripping head slide may be arranged on the gripping head. Furthermore, a gripping device carrier adjustment motor may be provided, by means of which the gripping device carrier is slidable relative to the gripping head.

[0078] Furthermore, the gripping head can be arranged to be displaceable along the Y-axis on a gripping height adjustment mount. A guide system can also be provided between the gripping head and the gripping height adjustment mount.

[0079] Furthermore, the gripping device height adjustment mount can be designed to be telescopic. This offers the advantage of improved accessibility to the lower-lying spindles.

[0080] Furthermore, a main support beam for the gripping device may be provided, extending along the Z-axis. In particular, the gripping device height adjustment mount may be slidably mounted on the main support beam along the Z-axis. A guide system may also be provided between the main support beam and the gripping device height adjustment mount.

[0081] Furthermore, it may be provided that the main support of the gripping device is mounted on the machine frame by means of a first support or a second support.

[0082] Furthermore, a first gripping device for changing the machining tool held in the first working spindle may be provided, wherein the gripping device has at least a first gripping unit and a second gripping unit arranged at a distance of one gripping unit from each other, and in particular that the first gripping device is displaceable only along the X-axis and along a vertical Y-axis, but not along the Z-axis. This has the advantage that the gripping device can have a simple design and, moreover, that tool changes can be carried out easily.

[0083] Especially in conjunction with a mounting comb that can be moved along the Z-axis and is located above the working spindles, it can be efficient if the first gripping device can be moved only along the X-axis and along a vertical Y-axis, but not along the Z-axis.

[0084] Furthermore, it can be advantageous to have a second working spindle arranged next to the first working spindle with respect to the horizontal X-axis, in particular that the second working spindle is assigned to a second tool holder. The tool magazine according to the invention is particularly advantageous in a machine tool designed in this way with two working spindles arranged side by side, since the machine tool must already have a large width due to the side-by-side arrangement of the working spindles, and thus the available space is used in an optimized manner.

[0085] Furthermore, it can be provided that the first receiving comb has lower receiving recesses opposite the first receiving recesses, and the second receiving comb has lower receiving recesses opposite the second receiving recesses, wherein the first receiving comb is designed to be pivotable by 180° with respect to a horizontal axis, so that either the first receiving recesses or the lower receiving recesses can be arranged on top, wherein the first receiving comb and / or the second receiving comb has a locking device for securing the machining tools, so that the machining tools located at the bottom are secured against falling out. This has the advantage that the storage capacity of the tool magazine can be further increased by this measure.In particular, it may be provided that the locking device is designed in the form of a positive-locking and friction-locking clamping device, which serves to hold the machining tools in the receiving recesses.

[0086] Furthermore, it can also be provided that the second receiving comb is designed to pivot by 180° with respect to a horizontal axis, so that either the second receiving recesses or the second lower receiving recesses can be arranged on top.

[0087] In particular, it may be provided that the gripping device serves to actuate the locking device.

[0088] The locking device prevents lower-lying machining tools from falling out. Locking the machining tools can also be advantageous when manipulating the mounting comb with the handling system.

[0089] Furthermore, it can be provided that the first and second tool holders, along with the machining tools mounted on them, are interchangeable by means of a handling system. This offers the advantage that the tool holders can be pre-loaded with machining tools and inserted into the machine tool. Thus, several machining tools can be fed into or removed from the machine tool simultaneously. Such a handling system could, for example, be an articulated robot arm. It is also conceivable that the tool changing device itself is used to replace the tool holder.

[0090] Furthermore, it can be provided that more tools of the same type are stored side-by-side in the tool magazine, particularly in adjacent tool holders, than the number of available working spindles. This measure ensures that at least one tool of the same type is always kept in reserve. Thus, in the event of a single tool breakage, that individual tool can be replaced. Additionally, a method for operating a machine tool can be provided.The machine tool can comprise the following components: a machine frame, a first work spindle rotatably mounted about a first spindle axis, the first spindle axis being arranged parallel to a horizontal Z-axis, a workpiece clamping device designed to hold at least one first workpiece, and a tool magazine for storing various machining tools, the tool magazine having at least one storage level with several adjacent tool positions, the tool positions being aligned parallel to the horizontal Z-axis and adjacent to each other with respect to a horizontal X-axis. The method comprises the following process steps:

[0091] - Machining the first workpiece using a machining tool mounted in the first working spindle;

[0092] - Changing the machining tool, whereby the machining tool previously held in the first working spindle is placed parallel to the horizontal Z-axis in one of the tool holding positions in the tool magazine.

[0093] This method offers the advantage that the machining tools do not need to be swiveled during tool changes. This allows for faster and more efficient tool changes.

[0094] According to a further development, it is possible to change the machining tool by means of a first gripping unit of a gripping device, gripping a machining tool stored in a first receiving comb of a comb holder of the tool magazine and lifting it along the Y-axis, wherein the comb holder is arranged above the first working spindle, and wherein the comb holder is then moved along the Z-axis so that the gripping device can be moved along the Y-axis into the machining area without having to move the gripping device along the Z-axis, wherein by means of a second gripping unit of the gripping device the machining tool located in the first working spindle is picked up and the machining tool located in the first gripping unit is inserted into the first working spindle.This offers the advantage of enabling easy tool changes. The first work spindle's ability to be moved along the Z-axis can be used to remove a tool from or insert a tool into the first work spindle.

[0095] Furthermore, it can be advantageous to arrange several tool holders in the tool magazine in a staggered arrangement along the Z-axis, with the tool holders having a longitudinal extension along the Z-axis. The longitudinal extension of at least some of the tool holders arranged in a row is adjustable, and the longitudinal extension of the tool holders along the Z-axis is adapted to the tool length of the machining tools to be stored. Different longitudinal extensions are set in different tool holders arranged in a row. This has the advantage of allowing optimal use of the space in the tool magazine. Moreover, this measure allows the travel distances of the gripping device to be kept as short as possible, thus maximizing the efficiency of the machine tool.

[0096] Furthermore, it may be provided that in a computer-implemented process step, a storage position of the machining tools and the necessary longitudinal extent of the individual tool holders in the Z-axis are calculated using a digital computer, whereby the calculation serves to minimize the tool change time and whereby the following parameters are taken into account in the calculation:

[0097] - a travel speed of a gripping device;

[0098] - the distance from the respective tool pickup position to the first working spindle;

[0099] - The frequency of use of the machining tools to be stored. This has the advantage of improving the efficiency of the machine tool. The calculation can take into account that frequently used machining tools should be arranged as close as possible to the respective work spindle. Furthermore, machining tools with the shortest possible tool length can be arranged as close as possible to the respective work spindle, whereby the longitudinal extent of the tool holders can be adapted to the tool length, so that the longitudinal extent of the tool holders is as short as possible and all machining tools arranged in series are positioned as close as possible to the first work spindle along the Z-axis.Furthermore, it may be provided that consideration is given to placing different machining tools with similar tool lengths next to each other at tool mounting positions with the same longitudinal extent, so that the occupancy density of the tool magazine can be kept as high as possible.

[0100] Furthermore, it can be advantageous to use the gripping device to adjust the longitudinal extension of the tool positions in the Z-axis. This has the advantage of minimizing the complexity of the machine tool, as the number of drives and moving parts can be reduced.

[0101] Furthermore, it can be provided that the first longitudinal extent of the first tool holder is adapted to the tool length of the longest of the machining tools to be accommodated in the first tool holder. The second longitudinal extent of the second tool holder can, of course, also be adapted to the tool length of the longest of the machining tools to be accommodated in the second tool holder.

[0102] Furthermore, it can be provided that the machining tools held in the tool magazine are repositioned using the gripping device when the gripping device is not currently performing a tool change. This has the advantage of keeping the tool change time as short as possible.

[0103] Furthermore, it may be possible to adjust the longitudinal extent of individual tool holder positions during re-machining. This measure allows for the best possible utilization of the space available in the tool magazine.

[0104] Furthermore, the procedure may include the following procedural steps:

[0105] - Removing a last used machining tool from the working spindle using the first gripping unit;

[0106] - Inserting a machining tool held in the second gripping unit into the working spindle;

[0107] - Moving the gripping device to the tool magazine to pick up a new machining tool from the tool magazine into the gripping device and simultaneously depositing the last used machining tool from the gripping device into the tool magazine; and at the same time

[0108] - Machining a workpiece using the machining tool mounted in the work spindle.

[0109] The advantage here is that the time required to retrieve a machining tool from the tool memory can be kept to a minimum. This is particularly beneficial when machining operations are very short and a new machining tool is needed as quickly as possible.

[0110] Furthermore, it can be provided that a second working spindle is arranged next to the first, with the working spindles being arranged parallel to each other and each serving to hold a machining tool, and that the tool changing device has a second gripping device, wherein the two gripping devices are moved synchronously with each other and simultaneously operate the two working spindles. Thus, the two working spindles can be operated synchronously with each other.

[0111] Furthermore, it can be advantageous if, for loading a new machining tool from the tool magazine into the gripper and simultaneously depositing the last used machining tool from the gripper into the tool magazine, the machining tools are arranged in the storage plane such that the new machining tool is positioned at a first tool holder, and a second tool holder is free at the gripper unit distance to the first tool holder. This second tool holder serves to deposit the last used machining tool from the gripper into the tool magazine. The advantage of this arrangement is that the gripper, with both gripper units and the machining tool held in one of them, can be moved to the respective storage unit to deposit the machining tool. The machining tool is guided into the free tool holder during this process.Simultaneously, the newly selected machining tool is gripped using the still-available gripping unit and can thus be guided to the machining spindle of the machine. The time required to remove the old machining tool and pick up the new one can therefore be kept to a minimum, as the gripping device does not have to move to two different positions in the tool magazine, but can remove the old machining tool and pick up the new one simultaneously in a single operation. The machining tools are positioned in the tool magazine in such a way as to enable the described machining steps. In particular, it can be provided that at least one of the tool holding positions per holding comb is free to allow for recurring sorting.

[0112] Furthermore, it can be provided that, during selected machining operations, particularly those with long machining times, the machining tools stored in the tool magazine are re-sorted by means of the gripping device while the workpiece is being machined. An advantage here is that the machining tools can be re-sorted according to the machining steps planned for the future, in order to always find a free tool holder next to a machining tool to be exchanged, thus enabling the tool change process according to the invention.

[0113] Furthermore, it can be advantageous to store machining tools that follow those used for shorter machining steps in the machining sequence closer to the work spindle than those used for longer machining steps. This measure ensures a quick tool change during machining with a short-duration tool, as the gripper only needs to travel short distances. This allows a new machining tool to be retrieved from the tool magazine even during this short time.

[0114] According to further training, it is possible to store frequently used machining tools closer to the work spindle than less frequently used tools. This measure ensures a faster tool changeover for frequently used tools, as the gripping device only has to travel short distances.

[0115] Furthermore, it can be advantageous to transfer the last used machining tool, after its removal from the work spindle, to a measuring device using the gripping device. This device records any wear on the machining tool. The benefit of this measure is that it allows for the detection of tool wear or any potential breakage. This enables a tool to be requested for replacement before the tool is stored in the tool magazine, or allows the tool to be placed in a designated location for replacement.

[0116] One possible procedure for changing the editing tools is as follows.

[0117] At the start of the tool change process, a new machining tool, ready for use in the next machining step, can be located in the first gripping unit of each gripping device. Furthermore, the second gripping units of each gripping device can be freely positioned to receive a machining tool. The gripping devices are moved towards the working spindles in such a way that the machining tool currently held in the working spindle can be grasped and removed using the second gripping unit.

[0118] To remove the machining tools from the work spindles, the individual grippers can be moved along the Z-axis. Alternatively or additionally, the individual work spindles can also be moved in the opposite direction along the Z-axis. If the individual work spindles are also moved along the Z-axis, the combined movement can significantly reduce tool change time.

[0119] The grippers mounted on the gripper carrier are then moved along the X-axis relative to the gripper head by means of the gripper carrier adjustment motor, allowing the new machining tool, which is held in the first gripper units, to be inserted into the work spindle. Alternatively or additionally, the individual work spindles can also be moved in the opposite direction along the X-axis. If the individual work spindles are also moved along the X-axis, the combined movement can significantly reduce the tool change time. Once the machining tool is inserted into the work spindle, the machining tool held in the second gripper unit can be transferred to the tool magazine using the tool changer.

[0120] Optionally, the wear of the machining tool can be determined beforehand using a measuring device.

[0121] When the grippers are moved to the tool magazine, the first gripper unit is free, and the second gripper unit holds the last used machining tool. The grippers are then moved to a storage level so that the last used machining tool can be placed in a free tool holder, and simultaneously, a new machining tool intended for the next machining operation can be picked up in a tool holder spaced at the same distance as the grippers. The second gripper unit opens to release the machining tool it holds, and the first gripper unit closes to accept the new machining tool. The gripper unit can then be moved back to the working spindles to insert the new machining tool.The placement of the machining tools and the adjustment of the length of the individual tool mounting positions can be carried out using the calculation of the digital computer.

[0122] The insertion of the new machining tool occurs analogously to the previously described procedures, except that now the first gripping unit, rather than the second, is used to hold the machining tool last inserted into the work spindle.

[0123] It is therefore intended that in every second process cycle the first gripping unit serves to hold the machining tool clamped in the working spindle, and in every second machining operation the second gripping unit serves to hold the machining tool clamped in the working spindle.

[0124] Furthermore, the gripping devices can be used to re-sort the machining tools in the tool magazine during extended machining operations. For a better understanding of the invention, it is explained in more detail with reference to the following figures.

[0125] They each show, in a highly simplified, schematic representation:

[0126] Fig. 1 shows a first embodiment of a machine tool in a first perspective view;

[0127] Fig. 2 shows the first embodiment of the machine tool in a front view;

[0128] Fig. 3 shows the first embodiment of the machine tool in a second perspective view;

[0129] Fig. 4 shows a detail of the four working spindles of the first embodiment of the machine tool in a first perspective view;

[0130] Fig. 5 shows a detail of the four working spindles of the first embodiment of the machine tool in a first perspective view;

[0131] Fig. 6 shows a detail of a tool changing device and a tool magazine of the first embodiment of the machine tool in a first perspective view;

[0132] Fig. 7 shows a detail of the tool changing device of the first embodiment of the machine tool in a first perspective view;

[0133] Fig. 8 shows a second embodiment of a machine tool in a first perspective view;

[0134] Fig. 9 shows a detail of the four working spindles of a third embodiment of the machine tool in a first perspective view;

[0135] Fig. 10 shows a detail of the four X-axis adjustment units of a fourth embodiment of the machine tool in a top view;

[0136] Fig. 11 shows a detail of the four X-axis adjustment units of a fifth embodiment of the machine tool in a top view; Fig. 12 shows a detail of a further embodiment of a receiving comb in a first perspective view;

[0137] Fig. 13 shows a schematic side view of a sixth embodiment of a machine tool;

[0138] Fig. 14 shows a third embodiment of a machine tool in a first perspective view.

[0139] It should be noted at the outset that in the differently described embodiments, identical parts are provided with the same reference numerals or component designations, and the disclosures contained in the entire description can be applied analogously to identical parts with the same reference numerals or component designations. Furthermore, the positional designations chosen in the description, such as top, bottom, side, etc., refer to the figure directly described and illustrated, and these positional designations must be applied analogously to the new position if the position changes.

[0140] Figures 1 to 7 show schematic representations of a first embodiment of a machine tool 1 for machining workpieces 2, 3 from various views. The machine tool 1 is described with reference to a combined view of Figures 1 to 7. It should be noted that, for the sake of clarity, not all reference numerals for the described components are included in each figure.

[0141] In particular, it may be provided that the machine tool 1 is used for machining a first workpiece 2 and a second workpiece 3.

[0142] The machine tool 1 has a machine frame 4, which serves as a base for the components attached to it.

[0143] For the sake of clarity, the machine frame 4 is shown only schematically in Fig. 1. It should be noted, however, that the machine frame 4 can be anchored at the installation site. Furthermore, the machine frame 4 can, of course, serve to support all components of the machine tool 1. The machine frame 4 itself can also comprise several components. Additionally, the machine tool 1 can be configured to include a first working spindle 5 and a second working spindle 6. The first working spindle 5 can be rotatably mounted about a first spindle axis 7. The second working spindle 6 can be rotatably mounted about a second spindle axis 8.

[0144] Furthermore, it can be provided that the first working spindle 5 and the second working spindle 6 are individually and independently adjustable to the machine frame 4 in a Z-axis 9 and an X-axis 10. Alternatively, it can be provided that the first working spindle 5 and the second working spindle 6 are positioned at a fixed height in a Y-axis 11 arranged at right angles to the Z-axis 9 and X-axis 10 relative to the machine frame 4.

[0145] In particular, the Z-axis 9 can be arranged horizontally. The Z-axis 9 can be arranged parallel to the first spindle axis 7 and the second spindle axis 8. Furthermore, the X-axis 10 can also be arranged horizontally. The X-axis 10 can be arranged at a right angle to the Z-axis 9. The Y-axis 11 can also be arranged vertically.

[0146] As can be further seen from Fig. 1, a third working spindle 12 may be provided, which is rotatably arranged about a third spindle axis 13. Furthermore, a fourth working spindle 14 may be provided, which is rotatably arranged about a fourth spindle axis 15.

[0147] Furthermore, it can be provided that the individual working spindles 5, 6, 12, 14 each serve to hold a machining tool 16 by means of which the workpieces 2, 3 can be machined.

[0148] Furthermore, it can be provided that the first working spindle 5 is displaceable along the X-axis 10 by means of a first X-axis adjustment unit 17. Furthermore, it can be provided that the second working spindle 6 is displaceable along the X-axis 10 by means of a second X-axis adjustment unit 18. In particular, it can be provided that the first X-axis adjustment unit 17 and the second X-axis adjustment unit 18 are displaceable independently of each other along the X-axis 10. As can be seen particularly well in Fig. 4, it can be provided that a first X-axis guide rail 19 and a second X-axis guide rail 20 are provided, which are arranged on the machine frame 4.

[0149] Furthermore, it can be provided that several first guide slides 21 are arranged on the first X-axis adjustment unit 17. Individual first guide slides 21 can be guided on the first X-axis guide rail 19 and individual first guide slides 21 can be guided on the second X-axis guide rail 20.

[0150] In particular, as shown in Fig. 5, two of the first guide slides 21 are designed to interact with the first X-axis guide rail 19 and two of the first guide slides 21 are designed to interact with the second X-axis guide rail 20.

[0151] Furthermore, it can be provided that several second guide carriages 22 are arranged on the second X-axis adjustment unit 18. Individual of the second guide carriages 22 can be guided on the first X-axis guide rail 19 and individual of the second guide carriages 22 can be guided on the second X-axis guide rail 20.

[0152] In particular, it may be provided that two of the second guide slides 22 are designed to interact with the first X-axis guide rail 19 and two of the second guide slides 22 are designed to interact with the second X-axis guide rail 20.

[0153] As can be seen from the individual figures, it can be provided that in this first embodiment of the machine tool 1 the first working spindle 5 and the third working spindle 12 are arranged together on the first X-axis adjustment unit 17 and are thus adjustable together along the X-axis 10.

[0154] Furthermore, it can be provided that the second work spindle 6 and the fourth work spindle 14 are arranged together on the second X-axis adjustment unit 18 and are thus jointly movable along the X-axis 10.

[0155] As can be seen particularly well in Fig. 5, the first X-axis adjustment unit 17 can be coupled to a first X-axis drive unit 23. Furthermore, the second X-axis adjustment unit 18 can be coupled to a second X-axis drive unit 24. The first X-axis drive unit 23 and the second X-axis drive unit 24 can be used to move or position the first X-axis adjustment unit 17 and the second X-axis adjustment unit 18, respectively, along the X-axis 10. Thus, the first X-axis adjustment unit 17 and the second X-axis adjustment unit 18 can be moved individually and independently of each other along the X-axis 10.

[0156] As can be seen particularly well in Fig. 4, the first working spindle 5 can be mounted on the first X-axis adjustment unit 17 by means of a first Z-axis adjustment unit 25 so as to be displaceable in the Z-axis 9. Furthermore, the second working spindle 6 can be mounted on the second X-axis adjustment unit 18 so as to be displaceable in the direction of the Z-axis 9 by means of a second Z-axis adjustment unit 26.

[0157] Furthermore, it can be provided that the third work spindle 12 is slidably mounted on the first X-axis adjustment unit 17 by means of a third Z-axis adjustment unit 27. Furthermore, it can be provided that the fourth spindle 14 is slidably mounted on the second X-axis adjustment unit 18 by means of a fourth Z-axis adjustment unit 28 along the Z-axis 9.

[0158] Furthermore, it may be provided that the first Z-axis adjustment unit 25 is mounted on the first Z-axis adjustment unit 17 by means of a first Z-axis guide 29. Furthermore, it may be provided that the second Z-axis adjustment unit 26 is mounted on the second X-axis adjustment unit 18 by means of a second Z-axis guide 30. Furthermore, it may be provided that the third Z-axis adjustment unit 27 is mounted on the first X-axis adjustment unit 17 by means of a third Z-axis guide 31. Furthermore, it may be provided that the fourth Z-axis adjustment unit 28 is mounted on the second X-axis adjustment unit 18 by means of a fourth Z-axis guide 32.

[0159] The individual Z-axis guides 29, 30, 31, 32 can each have guide rails which are arranged on the first X-axis adjustment unit 17 or on the second X-axis adjustment unit 18 and can have guide carriages which are arranged on the Z-axis adjustment unit 25, 26, 27, 28.

[0160] Furthermore, it can be provided that the first Z-axis adjustment unit 25 is adjustable relative to the first X-axis adjustment unit 17 by means of a first Z-axis drive unit 33.

[0161] Furthermore, it can be provided that the second Z-axis adjustment unit 26 is adjustable relative to the second X-axis adjustment unit 18 by means of a second Z-axis drive unit 34. Furthermore, it can be provided that the third Z-axis adjustment unit 27 is adjustable relative to the first X-axis adjustment unit 17 by means of a third Z-axis drive unit 35. Furthermore, it can be provided that the fourth Z-axis adjustment unit 28 is adjustable relative to the second X-axis adjustment unit 18 by means of a fourth Z-axis drive unit 36. In particular, it can be provided that the individual working spindles 5, 6, 12, 14 are individually and independently displaceable along the Z-axis 9 by means of the individual Z-axis drive units 33, 34, 35, 36.

[0162] Furthermore, it can be provided that the individual working spindles 5, 6, 12, 14 can each be individually and independently pivoted about the Y-axis 11 by means of a swivel bearing 37. This further increases the flexibility of the machine tool 1.

[0163] As can be seen from Figures 1 to 5, in the first embodiment of the machine tool 1, the individual working spindles 5, 6, 12, 14 are not displaceable along the Y-axis 11. Instead, the individual working spindles 5, 6, 12, 14 can all be arranged at a common height.

[0164] As can be seen particularly well from Fig. 1, it can further be provided that a workpiece clamping device 38 is designed, which serves to hold the first workpiece 2 and the second workpiece 3.

[0165] The workpiece clamping device 38 can have a workpiece table 39. The workpiece table 39 can have a first workpiece holding position 59 and a second workpiece holding position 60.

[0166] Furthermore, it may be provided that a Y-axis adjustment unit 58 is designed, by means of which the first workpiece table 39 can be moved along the Y-axis 11.

[0167] The workpiece table 39 can be pivotally mounted about a first pivot axis 40 relative to the machine frame 4. In particular, it can be provided that the first pivot axis 40 is arranged parallel to the X-axis 10. Furthermore, it can be provided that a first pivot bearing 41 and a second pivot bearing 42 are formed, by means of which the workpiece table 39 is pivotably mounted about the first pivot axis 40 on the machine frame 4.

[0168] Furthermore, it can be provided that the first pivot bearing 41 is coupled to a first mounting 43, wherein the first mounting 43 can be slidably mounted on the machine frame 4 along the Y-axis 11. Furthermore, it can be provided that the second pivot bearing 42 is coupled to a second mounting 44, wherein the second mounting 44 can be slidably mounted on the machine frame 4 along the Y-axis 11. In particular, it can be provided that first mounting guide slides 45 are arranged on the first mounting 43, which interact with a first Y-axis guide rail 46.

[0169] The first Y-axis guide rail 46 can be arranged on the machine frame 4. Furthermore, it can be provided that second mounting guide slides 47 are arranged on the second mounting 44, which interact with a second Y-axis guide rail 48. The second Y-axis guide rail 48 can also be arranged on the machine frame 4. Furthermore, it can be provided that a first Y-axis drive motor 49 is provided, by means of which the first mounting 43 can be moved along the Y-axis 11. Furthermore, it can be provided that a second Y-axis drive motor 50 is provided, by means of which the second mounting 44 can be moved along the Y-axis 11. In particular, it can be provided that the first Y-axis drive motor 49 and the second Y-axis drive motor 50 are operated synchronously with each other, so that the first pivot axis 40 is always parallel to the X-axis 10.

[0170] Furthermore, it may be provided that at least one swivel motor 51 is designed, by means of which the workpiece table 39 can be swivelled about the first swivel axis 40. The swivel motor 51 can be arranged on one of the two swivel bearings 41, 42. It may also be provided that two swivel motors 51 are designed on one of the swivel bearings 41, 42.

[0171] Furthermore, it can also be provided that one or two swivel motors 51 are arranged on each of the pivot bearings 41, 42. As schematically shown in Fig. 3, a handling system 99 can be provided by means of which the individual receiving combs 67, 68, 74, 75, together with the machining tools 16 held therein, can be inserted into or removed from the machine tool 1. This measure thus allows the tool storage capacity to be expanded. The handling system 99 can, for example, comprise an automated guided vehicle (AGV) by means of which the receiving combs 67, 68, 74, 75 can be transported over long distances within a production hall. Alternatively, it is of course also conceivable that the machining tools 16 are manipulated or received directly by means of the handling system 99.

[0172] As shown in Fig. 3, loading the machine tool 1 with tool holders 67, 68, 74, 75 or machining tools 16 can be carried out from the rear. Furthermore, it is also conceivable that the machine tool 1 is loaded from the side or from above using the handling system 99.

[0173] Furthermore, it can be provided that the first workpiece holding position 59 on the workpiece table 39 comprises a first rotary table 52, which can be rotatably mounted on the workpiece table 39 about a first axis of rotation 53. Furthermore, it can be provided that the second workpiece holding position 60 on the workpiece table 39 comprises a second rotary table 54, which can be rotatably mounted on the workpiece table 39 about a second axis of rotation 55. The first rotary table 52 can serve to hold the first workpiece 2. The second rotary table 54 can serve to hold the second workpiece 3. In particular, it can be provided that the first rotary table 52 and the second rotary table 54 are arranged individually and independently of each other, rotatably mounted on the workpiece table 39 about their respective axes of rotation 53 and 54. In particular, it can be provided that the first rotary table 52 is driven by a first rotary motor 56.Furthermore, it can be provided that the second rotary table 54 is driven by a second rotary motor 57.

[0174] As can be further seen from Fig. 1, it can be provided that the first working spindle 5 and the third working spindle 12 are assigned to the first rotary table 52 and that the second working spindle 6 and the fourth working spindle 14 are assigned to the second rotary table 54.

[0175] In a further embodiment not shown, it can also be provided that, in addition to the first rotary table 52 and the second rotary table 54, a third rotary table and a fourth rotary table are also provided on the workpiece table 39. Each of the rotary tables can serve to hold a workpiece. Thus, each of the working spindles 5, 6, 12, 14 can be assigned to its own rotary table.

[0176] As can be seen from Fig. 1, a tool changing device 61 can also be provided for changing the machining tools 16. Furthermore, a tool magazine 62 can be provided for holding and temporarily storing the machining tools 16.

[0177] The tool magazine 62 is used in particular for providing and storing different machining tools 16 for different machining operations.

[0178] As can be seen particularly well in Fig. 6, the tool magazine 62 can have several storage levels 63, each with several tool holding positions 64, 65. In particular, it can be provided that a storage level 63 is characterized by the fact that all tool holding positions 64, 65 of a storage level 63 are at a common height with respect to the Y-axis 11.

[0179] In the embodiment shown in Fig. 1, only one storage level 63 is shown for the sake of simplicity.

[0180] As can be further seen from Fig. 6, the tool holding positions 64, 65 can be aligned parallel to the horizontal Z-axis 9, with the machining tools 16 being aligned parallel to the horizontal Z-axis 9 and being held in the tool magazine 62. Furthermore, the individual tool holding positions 64, 65 can be arranged side by side at intervals along the horizontal X-axis 10.

[0181] As can be seen particularly well in Fig. 6, it is possible to arrange several tool holders 64, 65 one behind the other in the tool magazine 62, offset along the Z-axis 9. In particular, it is possible to arrange the first tool holder 64 and the second tool holder 65 at a distance from each other. Furthermore, it is possible to arrange several of the first tool holders 64 next to each other at a distance from each other along the horizontal X-axis 10. It is also possible to arrange several of the second tool holders 65 next to each other at a distance from each other along the horizontal X-axis 10.

[0182] As can be seen particularly well in Fig. 6, the tool magazine 62 can be provided with a first receiving comb 67 and a second receiving comb 68. The first receiving comb 67 and the second receiving comb 68 can each be designed to receive different machining tools 16. In particular, the first receiving comb 67 can have a transverse extension in the X-axis 10. Several first receiving recesses 69 can be arranged in the first receiving comb 67 at intervals 66 along the X-axis 10. Each of the first receiving recesses 69 can serve to receive one of the machining tools 16. Furthermore, the second receiving comb 68 can be provided with several second receiving recesses 70, the individual second receiving recesses 70 also being arranged at intervals 66 from each other along the X-axis 10.

[0183] Furthermore, it can be provided that the first mounting comb 67 and the second mounting comb 68 are slidably mounted on the machine tool 1 along the Z-axis 9. This measure allows a first longitudinal extent 71 of the first tool mounting position 64 and a second longitudinal extent 72 of the second tool mounting position 65 to be varied or adjusted.

[0184] In particular, this measure makes it possible to adapt the first longitudinal extent 71 of the first tool holding position 64 to a tool length 73 of the machining tools 16 to be held. Furthermore, this measure makes it possible to adapt the second longitudinal extent 72 of the second tool holding position 65 to the tool length 73 of the machining tools 16 to be held.

[0185] The settings can be adjusted such that the first longitudinal dimension 71 of the first tool holder 64 is adapted to the tool length 73 of the longest of the machining tools 16 to be accommodated. The second longitudinal dimension 72 of the second tool holder 65 can, of course, also be adapted to the tool length 73 of the longest of the machining tools 16 to be accommodated in the second tool holder 65. In the figures, machining tools 16 with the same tool length 73 are shown as examples for each tool holder 64, 65. Naturally, it is possible to accommodate different machining tools 16 with different tool lengths 73 side by side in each tool holder 64, 65.

[0186] Furthermore, it can also be provided that individual machining tools 16 have a tool length 73 which extends over several of the tool holding positions 64, 65. For example, it can be provided that the first holding comb 67 and the second holding comb 68 are designed or arranged such that the first holding recesses 69 and the second holding recesses 70 are aligned one behind the other. A single machining tool 16 with an excessively long tool length 73 can be held in one of the first holding recesses 69 and extend beyond the corresponding second holding recess 70. It must, of course, be ensured that the corresponding second holding recess 70 remains free of machining tools 16.

[0187] As can be further seen from Fig. 6, a third receiving comb 74 may be provided next to the first receiving comb 67. The third receiving comb 74 may be arranged along the X-axis 10 next to the first receiving comb 67. Furthermore, a fourth receiving comb 75 may be provided, wherein the fourth receiving comb 75 may be arranged along the X-axis 10 next to the second receiving comb 68.

[0188] In particular, it can be provided that the fourth receiving comb 75 is arranged at a distance from the third receiving comb 74 in the Z-axis 9. Furthermore, it can be provided that the third receiving comb 74 has third receiving recesses 76, spaced apart from each other in the X-axis 10, for receiving one of the machining tools 16 each. It can also be provided that the fourth receiving comb 75 has fourth receiving recesses 77. The fourth receiving recesses 77 can also be spaced apart from each other in the X-axis 10.

[0189] The third mounting comb 74 and the fourth mounting comb 75 can also be mounted individually and independently of each other in the Z-axis 9 on the machine tool 1, so that the corresponding longitudinal extent of the tool mounting position can be adapted to the machining tools 16 to be mounted.

[0190] In particular, it may be provided that the tool changing device 61 or the handling system 99 is used to position the receiving combs 67, 68, 74, 75 in the Z-axis 9.

[0191] As can be further seen in Fig. 6, it is of course also possible to provide additional receiving combs spaced apart along the X-axis 10, in addition to the first receiving comb 67 and the third receiving comb 74. Furthermore, it is also possible to provide additional receiving combs behind the first receiving comb 67 and the second receiving comb 68. These additional receiving combs can, mutatis mutandis, also have receiving recesses like the receiving combs already described and can also be arranged to be displaceable along the Z-axis 9 in the tool magazine 62.

[0192] Furthermore, it may be provided that a comb receptacle 78 is formed in the tool magazine 62, which serves to hold the individual receiving combs 67, 68, 74, 75. The comb receptacle 78 is hidden in Fig. 6 for the sake of clarity.

[0193] As can be seen particularly well in Fig. 7, the tool changing device 61 can be provided to include a first gripping device 79. The first gripping device 79 can have a first gripping unit 80 and a second gripping unit 81. The first gripping unit 80 and the second gripping unit 81 can be spaced apart from each other with respect to the X-axis 10 by a first gripping unit distance 82.

[0194] In particular, it may be provided that the first gripping unit spacing 82 is equal to the spacing 66 of the individual receiving recesses 69, 70 or a multiple of the spacing 66 of the individual receiving recesses 69, 70.

[0195] Furthermore, it can be provided that the first gripping device 79 is assigned to the first working spindle 5. In particular, it can be provided that a first of the machining tools 16, which is clamped in the first working spindle 5, can be removed by means of the first gripping unit 80 and subsequently a second of the machining tools 16, which is held in the second gripping unit 81, is inserted into the first working spindle 5.

[0196] In particular, it can be provided that the first gripping unit 80 and the second gripping unit 81 are aligned in such a way that the machining tools 16 can be aligned parallel to the Z-axis 9 in the respective gripping unit 80, 81.

[0197] Furthermore, it can be provided that a second gripping device 84 is mounted on the gripping device carrier 83, which has a third gripping unit 85 and a fourth gripping unit 86. The third gripping unit 85 and the fourth gripping unit 86 can be spaced apart from each other with respect to the X-axis 10 by a second gripping unit spacing 87. The function and / or dimensions of the second gripping device 84 can be identical to those of the first gripping device 79. Furthermore, it can be provided that the second gripping device 84 is assigned to the second work spindle 6.

[0198] Furthermore, it can be provided that the first gripping device 79 and the second gripping device 84 are arranged at a gripping device distance 88 from each other.

[0199] Furthermore, it may be provided that a third gripping device 89 and a fourth gripping device 90 are arranged on the gripping device carrier 83. The third gripping device 89 may be assigned to the third working spindle 12. The fourth gripping device 90 may be assigned to the fourth working spindle 14. The third gripping device 89 and the fourth gripping device 90 may be designed mutatis mutandis to the first gripping device 79 and each also have two gripping units.

[0200] As can be further seen from Fig. 7, the tool changing device 61 can be provided with a gripping device head 91. The gripping device carrier 83 can be slidably arranged on the gripping device head 91 along the X-axis 10. In particular, it can be provided that the gripping device carrier 83 is coupled to a gripping device carrier rail 92, which is slidably received in a gripping device head slide 93. The gripping device head slide 93 can be arranged on the gripping device head 91. Furthermore, it can be provided that a gripping device carrier adjustment motor 94 is provided, by means of which the gripping device carrier 83 can be slid relative to the gripping device head 91.

[0201] Furthermore, the gripping device head 91 may be arranged to be displaceable along the Y-axis 11 on a gripping device height adjustment mount 95. A guide system may also be provided between the gripping device head 91 and the gripping device height adjustment mount 95. Furthermore, a gripping device main support 96 may be provided, extending along the Z-axis 9. In particular, the gripping device height adjustment mount 95 may be displaceably mounted on the gripping device main support 96 along the Z-axis 9. A drive mechanism may also be provided for displacing the gripping device height adjustment mount 95 along the Z-axis 9 relative to the gripping device main support 96.

[0202] A guide system can also be provided between the main gripping device support 96 and the gripping device height adjustment mount 95. Furthermore, it can be provided that the main gripping device support 96 is mounted on the machine frame 4 by means of a first bracket 97 or a second bracket 98.

[0203] As schematically illustrated in Fig. 6, a handling system 99 can be provided by means of which the individual receiving combs 67, 68, 74, 75, together with the machining tools 16 held therein, can be inserted into or removed from the machine tool 1. This measure thus allows the tool storage capacity to be expanded.

[0204] Figure 8 shows a second, and optionally independent, embodiment of the machine tool 1, whereby the same reference numerals and component designations are used for identical parts as in the preceding Figures 1 to 7. To avoid unnecessary repetition, reference is made to the detailed description in the preceding Figures 1 to 7.

[0205] As can be seen from Fig. 8, it is possible that no further working spindles are provided besides the first working spindle 5 and the second working spindle 6. The basic structure of the machine tool 1 can be designed according to the first embodiment of the machine tool 1, whereby reference is made at this point to the description of the details of the first embodiment of the machine tool 1.

[0206] In this second embodiment of the machine tool 1, a further difference from the first embodiment of the machine tool 1 may be that the tool changing device 61 only comprises the first gripping device 79 and the second gripping device 84.

[0207] Figure 9 shows a second, and optionally independent, embodiment of the machine tool 1, whereby the same reference numerals and component designations are used for identical parts as in the preceding Figures 1 to 7. To avoid unnecessary repetition, reference is made to the detailed description in the preceding Figures 1 to 7.

[0208] For the sake of clarity, Fig. 9 shows only the individual working spindles 5, 6, 12, 14 together with their respective X-axis adjustment units 17, 18, 100, 101, whereby the remaining structure of the machine tool 1 can be the same as shown and described in the first embodiment.

[0209] As can be seen from Fig. 9, the third working spindle 12 can be arranged on a third X-axis adjustment unit 100. Furthermore, the fourth working spindle 14 can be arranged on a fourth X-axis adjustment unit 101. In particular, the third X-axis adjustment unit 100 can have third guide slides 102 by means of which the third X-axis adjustment unit 100 is slidably coupled to the first X-axis guide rail 19 or to the second X-axis guide rail 20.

[0210] Furthermore, it may be provided that the fourth X-axis adjustment unit 101 has a fourth guide carriage 103, by means of which the fourth X-axis adjustment unit 101 is coupled to the first X-axis guide rail 19 or to the second X-axis guide rail 20 in the direction of the X-axis 10 in a displaceable manner.

[0211] In this embodiment, the first working spindle 5, the second working spindle 6, the third working spindle 12, and the fourth working spindle 14 can be moved individually and independently of one another in the direction of the X-axis 10. Of course, in this third embodiment, each of the X-axis adjustment units 17, 18, 100, 101 can be provided with its own drive.

[0212] Figure 10 shows a second, and optionally independent, embodiment of the machine tool 1, whereby the same reference numerals and component designations are used for identical parts as in the preceding Figures 1 to 9. To avoid unnecessary repetition, reference is made to the detailed description in the preceding Figures 1 to 9.

[0213] For the sake of clarity, only the individual X-axis adjustment units 17, 18, 100, 101 are shown in Fig. 10, whereby the remaining structure of the machine tool 1 can be the same as shown and described in the first embodiment.

[0214] Fig. 10 shows a schematic top view of a fourth embodiment of a configuration of the X-axis adjustment units 17, 18, 100, 101. As can be seen from Fig. 10, a third X-axis guide rail 104 and a fourth X-axis guide rail 105 can be provided. The third X-axis guide rail 104 and the fourth X-axis guide rail 105 can be arranged parallel to the first X-axis guide rail 19 and the second X-axis guide rail 20, respectively. Furthermore, the first guide slides 21 of the first X-axis adjustment unit 17 and the third guide slides 102 of the third X-axis adjustment unit 100 can be arranged offset from each other according to the offset of the X-axis guide rails with respect to the Z-axis 9. The third guide carriages 102 can be slidably mounted on the third X-axis guide rail 104 or on the fourth X-axis guide rail 105.The fourth guide carriages 103 of the fourth X-axis adjustment unit 101 can be slidably mounted on the third X-axis guide rail 104 or on the fourth X-axis guide rail 105. By offsetting the first guide carriage 21 and the third guide carriage 102, or the second guide carriage 22 and the fourth guide carriage 103, relative to each other, it is possible to arrange the guide carriages at a large distance from each other on the X-axis adjustment units 17, 18, 100, 101, while still allowing the individual X-axis adjustment units 17, 18, 100, 101 to be moved close to each other. This is because, as can be seen in Fig. 10, the individual guide carriages can be moved relative to each other in an overlapping manner with respect to the X-axis 10 due to the offset in the direction of the Z-axis 9. Thus, high stiffness or...The stability of the individual X-axis adjustment units 17, 18, 100, 101 ensures maximum flexibility of the machine tool 1, as the individual work spindles 5, 6, 12, 14 can be moved as close to each other as possible.

[0215] In this embodiment as well, the X-axis adjustment units 17, 18, 100, 101 can be moved individually and independently of each other along the X-axis 10.

[0216] This design can also be combined with the design described below according to Fig. 11.

[0217] Figure 11 shows a second, and optionally independent, embodiment of the machine tool 1, using the same reference numerals and component designations for identical parts as in the preceding Figures 1 to 10. To avoid unnecessary repetition, reference is made to the detailed description in the preceding Figures 1 to 10. For the sake of clarity, Figure 11 shows only the individual working spindles 5, 6, 12, 14, including their respective X-axis adjustment units 17, 18, 100, 101, in a simplified manner. The remaining structure of the machine tool 1 can be the same as shown and described in the first embodiment.

[0218] As can be seen from Fig. 11, the third X-axis adjustment unit 100 can be coupled to the first X-axis adjustment unit 17 by means of a first X-axis compensation unit 106. The third X-axis adjustment unit 100 is therefore not completely independent of the first X-axis adjustment unit 17 in the direction of the X-axis 10, but rather dependent on it.

[0219] Furthermore, it can be provided that the fourth X-axis adjustment unit 101 is coupled to the second X-axis adjustment unit 18 by means of a second X-axis compensation unit 107. The third X-axis adjustment unit 100 can thus be displaceable relative to the first X-axis adjustment unit 17. The fourth X-axis adjustment unit 101 can thus be displaceable relative to the second X-axis adjustment unit 18.

[0220] Figure 12 shows a second, and optionally independent, embodiment of the receiving comb, whereby the same reference numerals and component designations are used for identical parts as in the preceding Figures 1 to 11. To avoid unnecessary repetition, reference is made to the detailed description in the preceding Figures 1 to 11.

[0221] The receiving comb, which is shown in Fig. 12, can be combined with all other embodiments of the machine tool 1.

[0222] As can be seen in Fig. 12, the first receiving comb 67 can have first lower receiving recesses 108 opposite the first receiving recesses 69, which can also serve to receive machining tools 16. Furthermore, the first receiving comb 67 can have a locking device 110 by means of which the machining tools 16 can be secured in the first receiving comb 67. This measure prevents machining tools 16 from falling out. Locking the machining tools 16 may also be necessary when manipulating the receiving comb 67, 68 with the handling system 99.Furthermore, it can be provided that the first receiving comb 67 is pivotably mounted about a horizontal axis 111 by 180°, so that either the first receiving recesses 69 or the first lower receiving recesses 108 can be brought to the top of the first receiving chamber 67 in order to be able to change the machining tools 16.

[0223] In particular, the horizontal axis 111 can be arranged parallel to the Z-axis 9.

[0224] Mutatis mutandis, it may be provided that the second intake ridge has 68 second lower intake troughs 109.

[0225] Figure 13 shows a second, and optionally independent, embodiment of the machine tool 1, whereby the same reference numerals and component designations are used for identical parts as in the preceding Figures 1 to 7. To avoid unnecessary repetition, reference is made to the detailed description in the preceding Figures 1 to 7.

[0226] Fig. 13 shows another embodiment of the machine tool 1 in a schematic cutaway side view.

[0227] As can be seen from Fig. 13, it can be provided that the first receiving comb 67 or the comb receptacle 78 forms part of the housing 112 of the machine tool 1 and that the machining tools 16, which are received in the first receiving comb 67, are thus arranged outside the housing 112. In particular, it can be provided that an opening 113 is formed in the housing 112 of the machine tool 1, which can be closed by the comb receptacle 78.

[0228] The first gripping unit 80 can grasp the machining tool 16 held in the first receiving comb 67 and move it upwards along the Y-axis 11. Subsequently, the first receiving comb 67, together with the comb holder 78, can be moved laterally along the Z-axis 9 to expose the opening 113 in the housing 112, which is closed by the comb holder 78.

[0229] The machining tool received in the first gripping unit 80 can then be

[0230] 16 along the Y-axis 11 downwards and from the first work spindle

[0231] 5. The first working spindle 5 can be moved along the Z-axis 9. Thus, in such a configuration, it is not necessary for the first gripping unit 80 to be movable along the Z-axis 9.

[0232] Figure 14 shows a second, and optionally independent, embodiment of the machine tool 1, whereby the same reference numerals and component designations are used for identical parts as in the preceding Figures 1 to 13. To avoid unnecessary repetition, reference is made to the detailed description in the preceding Figures 1 to 13.

[0233] As can be seen from Fig. 14, it can be provided that the first working spindle 5 is assigned to the first rotary table 52, that the second working spindle 6 is assigned to the second rotary table 54, that the third working spindle 12 is assigned to a third rotary table 114, and that the fourth working spindle 14 is assigned to a fourth rotary table 115.

[0234] The exemplary embodiments show possible embodiment variants, whereby it should be noted at this point that the invention is not limited to the specifically illustrated embodiment variants, but rather various combinations of the individual embodiment variants are also possible and this possibility of variation lies within the skill of the person skilled in this technical field due to the teaching on technical action by the present invention.

[0235] The scope of protection is defined by the claims. However, the description and drawings must be consulted for the interpretation of the claims. Individual features or combinations of features from the different embodiments shown and described can, in themselves, represent independent inventive solutions. The problem underlying these independent inventive solutions can be found in the description.

[0236] All references to value ranges in this description are to be understood as encompassing any and all sub-ranges thereof. For example, the reference 1 to 10 is to be understood as including all sub-ranges, starting with a lower limit of 1 and ending with an upper limit of 10. This means that all sub-ranges begin with a lower limit of 1 or greater and end with an upper limit of 10 or less, e.g., 1 to 1.7, or 3.2 to 8.1, or 5.5 to 10. Finally, for the sake of clarity, it should be noted that, for better understanding of the structure, some elements have been shown not to scale and / or enlarged and / or reduced.

[0237] Reference sign setup

[0238] Machine tool 31 Third Z-axis guide, first workpiece 32 Fourth Z-axis guide, second workpiece 33 First Z-axis drive unit, machine frame 34 Second Z-axis drive unit, first work spindle 35 Third Z-axis drive unit, second work spindle 36 Fourth Z-axis drive unit, first spindle axis 37 Swivel bearing, work spindle, second spindle axis 38 Workpiece clamping device, Z-axis 39 Workpiece table, X-axis 40 First swivel axis

[0239] Y-axis 41 first swivel bearing third working spindle 42 second swivel bearing third spindle axis 43 first mount fourth working spindle 44 second mount fourth spindle axis 45 first mount guide slide machining tool 46 first Y-axis guide rail first X-axis adjustment unit 47 second mount guide slot width X-axis adjustment unit first X-axis guide rail 48 second Y-axis guide rail second X-axis guide rail 49 first Y-axis drive motor first guide slide 50 second Y-axis drive motor second guide slide 51 swivel motor first X-axis drive unit 52 first rotary table second X-axis drive unit 53 first rotary axis first Z-axis adjustment unit 54 second rotary table second Z-axis adjustment unit 55 second rotary axis third Z-axis adjustment unit 56 first rotary motor fourth Z-axis adjustment unit 57 Second rotary motor, first Z-axis guide; 58 Y-axis adjustment unit, second Z-axis guide; 59first workpiece holding position second workpiece holding position 91 gripper head

[0240] Tool change device 92 gripping device carrier rail

[0241] Tool magazine 93 gripper head slide

[0242] Storage level 94 Gripper carrier adjustment - first tool mounting position motor second tool mounting position 95 Gripper height adjustment distance adjustment mount first mounting comb 96 Gripper main carrier second mounting comb 97 first holder first mounting recess 98 second holder second mounting recesses 99 Handling system first longitudinal extension first 100 third X-axis adjustment unit

[0243] Tool holder 101 fourth X-axis adjustment unit second longitudinal extension second 102 third guide slide

[0244] Tool holding station 103 fourth guide slide

[0245] Tool length 104 third X-axis guide rail third mounting comb 105 fourth X-axis guide rail fourth mounting comb 106 first X-axis compensation unit third mounting recesses fourth mounting recesses 107 second X-axis compensation unit

[0246] Comb mounting unit first gripping device 108 first lower mounting recesses first gripping unit 109 second lower mounting recesses second gripping unit 110 locking device first gripping unit spacing 111 axis

[0247] Gripping device carrier 112 Housing second gripping device 113 Opening third gripping unit 114 Third rotary table fourth gripping unit 115 Fourth rotary table second gripping unit spacing

[0248] Gripping device spacing third gripping device fourth gripping device

Claims

Patent claims 1. Machine tool (1) comprising: - a machine frame (4); - a first working spindle (5) which is rotatably mounted about a first spindle axis (7), wherein the first spindle axis (7) is arranged parallel to a horizontal Z-axis (9); - a second work spindle (6) which is rotatably mounted about a second spindle axis (8), wherein the second spindle axis (8) is arranged parallel to the horizontal Z-axis (9), wherein the first work spindle (5) and the second work spindle (6) are arranged next to each other spaced apart in a horizontal X-axis (10); - a workpiece clamping device (38) with a first workpiece holding position (59) which is designed to hold at least one first workpiece (2), characterized in that the first work spindle (5) is displaceable along the X-axis (10) by means of a first X-axis adjustment unit (17) and the second work spindle (6) is displaceable along the X-axis (10) by means of a second X-axis adjustment unit (18), wherein the first work spindle (5) and the second work spindle (6) are displaceable independently of each other along the X-axis (10) and that the first work spindle (5) is displaceable along the Z-axis (9) by means of a first Z-axis adjustment unit (25) and the second work spindle (6) is displaceable along the Z-axis (9) by means of a second Z-axis adjustment unit (26),wherein the first work spindle (5) and the second work spindle (6) are independently movable along the Z-axis (9) and that the first workpiece holding position (59) is movable along a vertical Y-axis (11) by means of a Y-axis adjustment unit (58).

2. Machine tool (1) according to claim 1, characterized in that the first working spindle (5) is displaceable along the X-axis (10) exclusively by means of the first X-axis adjustment unit (17) and the second working spindle (6) is displaceable along the X-axis (10) exclusively by means of a second X-axis adjustment unit (18).

3. Machine tool (1) according to claim 1 or 2, characterized in that the workpiece clamping device (38) comprises a second workpiece holding position (60), which is designed to receive a second workpiece (3), wherein the first workpiece receiving position (59) and the second workpiece receiving position (60) can be moved together along the vertical Y-axis (11) by means of a Y-axis adjustment unit (58).

4. Machine tool (1) according to one of the preceding claims, characterized in that the first workpiece holding position (59) is arranged on a workpiece table (39) which is pivotably mounted about a pivot axis (40), wherein the pivot axis (40) is aligned parallel to a horizontal X-axis (10), wherein the workpiece table (39) is displaceable along a vertical Y-axis (11) by means of the Y-axis adjustment unit (58).

5. Machine tool (1) according to claims 3 and 4, characterized in that the first workpiece holding position (59) and the second workpiece holding position (60) are arranged on the workpiece table (39).

6. Machine tool (1) according to one of the preceding claims, characterized in that a third work spindle (12) is formed which is rotatably mounted about a third spindle axis (13), wherein the third spindle axis (13) is arranged parallel to the horizontal Z-axis (9) and wherein the third work spindle (12) is arranged next to the first work spindle (5) and that a fourth work spindle (14) is formed which is rotatably mounted about a fourth spindle axis (15), wherein the fourth spindle axis (15) is arranged parallel to the horizontal Z-axis (9) and wherein the fourth work spindle (14) is arranged next to the second work spindle (6).

7. Machine tool (1) according to claim 6, characterized in that the first working spindle (5) and the third working spindle (12) are jointly displaceable along the X-axis (10) by means of the first X-axis adjustment unit (17) and that the second working spindle (6) and the fourth working spindle (14) are jointly displaceable along the X-axis (10) by means of the second X-axis adjustment unit (18).

8. Machine tool (1) according to claim 7, characterized in that the third working spindle (12) is displaceable relative to the first working spindle (5) along the X-axis (10) by means of a first X-axis compensation unit (106) and that the fourth working spindle (14) is displaceable relative to the second working spindle (6) along the X-axis (10) by means of a second X-axis compensation unit (107).

9. Machine tool (1) according to claim 6, characterized in that the first working spindle (5) is displaceable along the X-axis (10) by means of the first X-axis adjustment unit (17) and the third working spindle (12) is displaceable along the X-axis (10) by means of a third X-axis adjustment unit (100) and the second working spindle (6) is displaceable along the X-axis (10) by means of the second X-axis adjustment unit (18) and the fourth working spindle (14) is displaceable along the X-axis (10) by means of a fourth X-axis adjustment unit (101), wherein the first working spindle (5), the second working spindle (6), the third working spindle (12) and the fourth working spindle (14) are displaceable independently of one another along the X-axis (10).

10. Machine tool (1) according to one of claims 6 to 9, characterized in that the third working spindle (12) is displaceable along the Z-axis (9) by means of a third Z-axis adjustment unit (27) and the fourth working spindle (14) is displaceable along the Z-axis (9) by means of a fourth Z-axis adjustment unit (28), wherein the first working spindle (5), the second working spindle (6), the third working spindle (12) and the fourth working spindle (14) are displaceable independently of each other along the Z-axis (9).

11. Machine tool (1) according to one of the preceding claims, characterized in that a first X-axis guide rail (19) and a second X-axis guide rail (20) are formed on the machine frame (4), wherein the first X-axis guide rail (19) and the second X-axis guide rail (20) are spaced apart from each other in the Z-axis (9) on the machine frame (4), wherein the first X-axis adjustment unit (17) is slidably mounted on the first X-axis guide rail (19) by means of at least one first guide slide (21) and is slidably mounted on the second X-axis guide rail (20) by means of at least one further first guide slide (21). is mounted and wherein the second X-axis adjustment unit (18) is mounted on the first X-axis guide rail (19) by means of at least one second guide carriage (22) and is slidably mounted on the second X-axis guide rail (20) by means of at least one further second guide carriage (22).

12. Machine tool (1) according to claims 6 and 11, characterized in that the third X-axis adjustment unit (100) is slidably mounted on the first X-axis guide rail (19) by means of at least one third guide slide (102) and is slidably mounted on the second X-axis guide rail (20) by means of at least one further third guide slide (102), and that the fourth X-axis adjustment unit (101) is slidably mounted on the first X-axis guide rail (19) by means of at least one fourth guide slide (103) and is slidably mounted on the second X-axis guide rail (20) by means of at least one further fourth guide slide (103).

13. Machine tool (1) according to claims 6 and 11, characterized in that a third X-axis guide rail (104) and a fourth X-axis guide rail (105) are formed on the machine frame (4), wherein the first X-axis guide rail (19), the second X-axis guide rail (20),The third X-axis guide rail (104) and the fourth X-axis guide rail (105) are each mounted on the machine frame (4) at a distance from each other in the Z-axis (9), wherein the third X-axis adjustment unit (100) is slidably mounted on the third X-axis guide rail (104) by means of at least one third guide slide (102) and is slidably mounted on the fourth X-axis guide rail (105) by means of at least one further third guide slide (102), and that the fourth X-axis adjustment unit (101) is slidably mounted on the third X-axis guide rail (104) by means of at least one fourth guide slide (103) and is slidably mounted on the fourth X-axis guide rail (105) by means of at least one further fourth guide slide (103).

14. Machine tool (1) according to one of claims 4 to 13, characterized in that the workpiece table (39) is mounted by means of a first pivot bearing (41) and a second pivot bearing (42) rotatably mounted on the machine frame (4), wherein the Y-axis adjustment unit (58) has a first receptacle (43) which is guided on at least one first Y-axis guide rail (46) and a second receptacle (44) which is guided on at least one second Y-axis guide rail (48), wherein the first pivot bearing (41) is arranged on the first receptacle and the second pivot bearing (42) is received on the second receptacle (44).

15. Machine tool (1) according to claim 14, characterized in that the first receptacle (43) is driven by means of a first Y drive motor (49) along the vertical Y-axis (11) is movable and that the second mount (44) is movable along the vertical Y-axis (11) by means of a second Y-drive motor (50).

16. Machine tool (1) according to one of claims 3 to 15 and claim 6, characterized in that the first working spindle (5) and the third working spindle (12) are assigned to the first workpiece holding position (59) and the second working spindle (6) and the fourth working spindle (14) are assigned to the second workpiece holding position (60).

17. Machine tool (1) according to one of claims 2 to 16 and claim 5, characterized in that the first workpiece holding position (59) comprises a first rotary table (52) by means of which the first workpiece (2) is rotatably mounted about a first rotary axis (53) arranged normal to the pivot axis (40) and that the second workpiece holding position (60) comprises a second rotary table (54) by means of which the second workpiece (3) is rotatably mounted about a second rotary axis (55) arranged normal to the pivot axis (40).

18. Machine tool (1) according to one of the preceding claims, characterized in that two of the first working spindles (5) are arranged one above the other on the first Z-axis adjustment unit (25) and that two of the second working spindles (6) are arranged one above the other on the second Z-axis adjustment unit (26).

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