Exchangeable extension adapter, and method for a working spindle of a machine tool

Abstract

An exchangeable extension adapter (1) is proposed for a working spindle (2) of a machine tool for expanding the machining functions and for providing additional media, separate from the working spindle, directly at the working spindle (2). The extension adapter (1) comprises an adapter body (10) which comprises at least one clamping point, for releasable connection to a stator side of the working spindle (2). The extension adapter (1) additionally comprises an interface (12) for providing at least one medium M, and an integrated media store and / or a media supply (14), separate from the working spindle (1), for the at least one medium M.

Description

[0001] Interchangeable extension adapter and method for a work spindle of a machine tool

[0002] The invention relates to an exchangeable extension adapter for a work spindle of a machine tool and a method for a work spindle of the machine tool.

[0003] With modern machine tools, the machining of workpieces requires the use of a wide variety of tools and working media, such as cooling lubricants, drilling emulsion, thread-cutting oils or additional sensor data, such as temperature or optical signals.

[0004] While known machine tools, such as those described in WO 2021 / 170396 A1, allow the use of a wide variety of tools mounted on tool holding positions, these tools are usually limited in their application and heavily dependent on the tool carrier or the tool spindle. A machine tool with a column and motor-driven spindle head with an integrated rotary drive for at least one tool is described, for example, in DE 10 061 934 A1. In particular, a machine tool for machining workpieces with a movable spindle head is proposed there. Such a machine tool is usually built as a program-controlled universal milling machine. A work spindle is directly driven by an integrated motor and can be moved by motor in a horizontal and / or vertical coordinate axis.

[0005] Currently, various media, such as electrical, hydraulic, and pneumatic media, are fed to the tool via various energy chains in the tool spindle. However, this often presents the problem that the design of the work spindle only provides limited installation space. Furthermore, carrying various energy chains with the spindle proves to be a challenge in practice, as only a certain amount of space is available in the tow.

[0006] As a result, certain machining options are currently technically impossible or difficult to implement and require, for example, transferring the workpiece to a different machine tool. This includes, for example, machining using waterjet cutting. For example, after milling on a machine tool described above, the machined workpiece must be unclamped and clamped into a machine tool for waterjet cutting. Waterjet cutting requires extremely high pressures, so dedicated machines are traditionally used for this purpose. There are also solutions in which an external hose is wrapped around the work spindle and transfers the medium to the tool of the work spindle.However, this solution leads to the problem that a permanent hose line in the work area leads to an additional interference contour, which severely limits the machining process and increases the susceptibility to errors during machining.

[0007] Therefore, it is an object of the present invention to solve the described problems and thus to provide a machining unit that enables flexible and simultaneously reliable machining of workpieces. A further object is to provide a device that enables increased machining flexibility in a machine tool, which in particular has a movable work spindle, in order to thus improve production efficiency and machining options. A further object is to provide a method with which a machine tool can be operated to achieve increased flexibility in machining workpieces and simultaneously optimize production efficiency.

[0008] To achieve the objects, the features of the independent claims are proposed. Advantageous further developments can be found in the dependent claims. An extension adapter for a work spindle of a machine tool for expanding the machining functions and / or for providing additional media to the work spindle can comprise an adapter body having at least one clamping point for releasably connecting to a stator side of the work spindle. Particularly preferably, at least two opposing clamping points are provided. More preferably, four spaced-apart clamping points are provided. The extension adapter can have an interface (or media interface) for providing at least one medium (additional medium). Particularly preferably, at least two additional media are provided.The expansion adapter can also have an integrated media reservoir and / or a media supply for the at least one medium (additional medium) that is separate from the work spindle. This advantageous design enables flexible and efficient machining of workpieces on a machine tool.

[0009] The extension adapter can advantageously also comprise a functional unit which is operated by means of the at least one medium provided via the interface. The functional unit is advantageously operated separately from the control of the work spindle, for example via separate signal lines or separate communication paths. The at least one functional unit can advantageously be: a manipulator, an auxiliary spindle, a coolant supply nozzle, a grinding unit, a grinding wheel, an angle head, a water jet cutting tool, a deburring tool, a measuring device, a gripper, an optical element, a powder nozzle, a laser head, a welding device, a hardening device and / or a tool for influencing another tool or a workpiece. In addition, the functional unit can be a monitoring device which contains at least one measuring unit.The measuring device can contain mechanized, electrical, electromechanical, acoustic, or optical sensors, each of which can measure the conditions (temperature, position, vibrations, etc.) in the area of ​​the spindle head with high measurement accuracy. Particularly advantageous is the functional unit with its own drive, which is supplied and controlled via the auxiliary medium, e.g., an electric motor.

[0010] The at least one medium can be an additional medium that can be supplied separately from the work spindle media. The work spindle media can also be referred to as internal work spindle media. This internal medium is, for example, the coolant flow through the work spindle, whereby the coolant can be delivered to the cutting tool (tool) of the work spindle at high pressure. The additional medium is advantageously supplied to the extension adapter using a separate pump or delivery device. This separate pump is separate from the pump used to supply the internal work spindle medium.

[0011] The functional unit can advantageously be designed to act on a tool clamped in the work spindle. The functional unit serves to expand the functions during workpiece machining, in addition to a tool that is already clamped in the work spindle. This expansion of functions can also be seen in interaction with the tool clamped in the work spindle, for example if the extension adapter is connected to the tool. This means, for example, that the coolant for the tool clamped in the work spindle can be supplied via the extension adapter without having to use the internal media. In addition, other media (to expand the functions) can also be supplied to the tool, such as sensor signals, electrical energy, compressed air and the like. This design can also greatly increase the flexibility during workpiece machining.

[0012] The extension adapter can comprise, as a functional unit, a manipulator, an auxiliary spindle, a coolant supply nozzle, and / or a tool for machining the tool mounted in the work spindle. Furthermore, two or three functional units can also be provided on the same extension adapter. The at least one functional unit can advantageously be: a manipulator, an auxiliary spindle, a coolant supply nozzle, a grinding unit, a grinding wheel, an angle head, a water jet cutting tool, a deburring tool, a measuring device, a gripper, an optical element, a powder nozzle, a laser head, a welding device, a hardening device, and / or a tool for acting on another tool or a workpiece.

[0013] The separate media supply may comprise a flexible line for supplying and / or discharging compressed air, hydraulic fluid, cooling lubricant, control signals, sensor signals and / or electrical energy, and wherein the flexible line is preferably arranged outside a housing (and / or separately therefrom) of the work spindle.

[0014] The adapter body can be designed as a ring such that a tool clamped into the work spindle can be passed through the ring opening (in the center of the ring body). Thus, the extension adapter can preferably enclose the tool to allow for extensive contact with the tool, for example, the extensive introduction of coolant via nozzles for cooling and lubricating the tool during machining.

[0015] The energy storage device can be a rechargeable storage element, in particular an electrochemical energy storage device. A signal and control unit is particularly preferably also integrated. With this particularly advantageous embodiment, a supply via supply line is thus no longer necessary, which keeps the workspace particularly free from disruptions. To recharge the storage device, it can be charged using a charging station in the storage position of the extension adapter in order to have the required storage level the next time it is used. Optionally, however, the solution with an integrated rechargeable storage element can also be combined with an additional media supply via a supply line in order to achieve a particularly high level of flexibility during processing. The at least one medium can be one of the following media: hydraulics, pneumatics, or electricity. Fluids, gases, and solids of any kind can particularly preferably be used as additional media.Thus, the present proposal is for an interchangeable adapter or adapter ring that can be interchangeably mounted and clamped onto the work spindle or spindle of a machine tool. The adapter can transfer a wide variety of media, such as electrical, hydraulic, pneumatic, or cooling lubricants, as well as signals and safety technology. Furthermore, it is possible to transfer a wide variety of media simultaneously.

[0016] Advantageously, a machining unit for a machine tool can comprise: a work spindle with a tool holder; a housing which at least partially encloses the work spindle, wherein the work spindle is a movable work spindle with an additional clamping means in the region of the tool holder; and at least one replaceable extension adapter which can be clamped to the additional clamping means.

[0017] The machining unit can advantageously be designed such that the additional clamping device is arranged separately from a tool clamping device of the work spindle and can preferably be operated separately. Thus, a machining unit is provided which, in particular, has a movable work spindle, increasing machining flexibility, thus improving production efficiency and machining options.

[0018] Advantageously, the additional clamping device can be detachably attached to a stator side of the work spindle, in particular the housing.

[0019] The extension adapter can also be configured to supply the additional medium independently of the rotary movement of the work spindle and / or wherein the extension adapter is configured to perform the additional function independently of the rotary movement of the work spindle. The functional unit can also be configured to machine a workpiece simultaneously with a tool clamped in the work spindle. Thus, an interchangeable adapter or adapter ring is proposed here, which can be interchangeably mounted and clamped onto the work spindle or spindle of a machine tool. The adapter can transfer a wide variety of media, for example electrical, hydraulic, or pneumatic fluids or cooling lubricants, as well as signals and safety technology. Furthermore, it is possible to transmit a wide variety of media simultaneously.

[0020] The additional clamping device can also be a quick-clamping system for automated clamping of the extension adapter.

[0021] The additional clamping device can be attached to an annular flange of the housing, and the annular flange can at least partially enclose the work spindle.

[0022] The media supply can comprise a media supply line which can be a flexible line and which can be arranged separately from the work spindle and is designed to be movable together with the work spindle.

[0023] The extension adapter can be designed to be interchangeable, allowing it to be inserted into the stator side of the work spindle, preferably automatically. Since the work spindle is designed to be movable, this creates the possibility of automated replacement by moving the extension adapter. The proposed extension adapter thus enables simple and quick insertion into a stator area of ​​the machine tool's work spindle.

[0024] A method for operating a machine tool with an additional adapter can comprise at least the step of providing at least one medium to the work spindle of the machine tool by means of the extension adapter, wherein the at least one medium is an additional medium that can be supplied separately from the media of the work spindle. The method can advantageously also comprise the step of machining a workpiece using a tool that is accommodated in the work spindle and the functional unit of the additional adapter.

[0025] The method can advantageously also include the step of changing an additional adapter by moving the work spindle to a storage location and automatically or manually clamping a supplementary adapter into the additional clamping device. Since the work spindle is designed to be movable, this creates the possibility of enabling automated changing by moving the extension adapter. The storage location or deposit location is advantageously equipped with locating bolts for the additional adapter. The corresponding counterpart, for example two milled indexing grooves, are attached to the additional adapter. Furthermore, the deposit location has an optional protective cover to protect the additional adapter from contamination. Optionally, the deposit location can be equipped with one or more active movements to enable automated clamping, for example byto support a linear movement which goes to the mounting holes on the spindle.

[0026] A computer program product may include instructions which, when executed by a computer, cause the computer to carry out the method as described.

[0027] The proposed extension adapter thus enables simple and quick tool changing in a stator area of ​​the machine tool's work spindle. The extension adapter can be designed as an annular body or as an outer ring, which allows a tool of the work spindle to pass through the inner opening. The outer ring thus encloses a tool clamped in the work spindle. The media supply provided on the extension adapter makes it possible to supply a wide variety of media in the area of ​​the tool of the work spindle. Since the work spindle is designed to be movable, this creates the possibility of automated tool changing by moving the extension adapter.In a particularly advantageous embodiment, the extension adapter allows the use of compressed air or a wide variety of processing fluids via the media supply, which can be supplied to the tool or the workpiece in the processing area using the extension adapter. Thus, the extension adapter comprises not only a media supply, but also a media transfer unit or an interface and / or a functional unit.

[0028] A functional unit can, for example, be a nozzle unit with which compressed air or a fluid can be supplied directly to the tool clamped in the work spindle. The extension adapter also includes a clamping point for releasably connecting it to the stator side of the work spindle. This clamping point can be provided as a clamping device for clamping and releasing the at least one supplied clamping shank of the extension adapter into the clamping shank receptacle at the front end of the stator of the work spindle.

[0029] Since the work spindle is designed to be movable, this creates the possibility of enabling automated replacement by moving the extension adapter. For example, by moving the work spindle to a changer section, it can automatically replace a first extension adapter with a second extension adapter. Optionally, an extension adapter can also simply be detached from the work spindle at the replacement position, thus remaining in the waiting position, allowing further machining of the work spindle without an extension adapter. To achieve the introduction of the media, the extension adapter has a media supply, which is designed, for example, as a line, cable, or channel for guiding the medium to be supplied.The media supply (in particular designed as a cable) is preferably designed to be flexible and / or wound on a type of movable cable drum, which is able to compensate for or allow all necessary movements of the spindle.

[0030] For example, a compressed air hose, which can also be spiral-shaped, can be used to supply compressed air. For example, a corresponding fluid line can be provided to supply hydraulic fluid, oil lubricant, or coolant. To supply electrical media, such as signals or general power, to the expansion adapter, the media supply can be designed as a corresponding electrical line, such as an electrical signal line. Particularly advantageously, an integrated media storage device can also be provided, in which a variety of media are stored, such as an electric battery.

[0031] Thus, the present proposal is for an interchangeable adapter or adapter ring that can be interchangeably mounted and clamped onto the work spindle or spindle of a machine tool. The adapter can transfer a wide variety of media, such as electrical, hydraulic, or pneumatic fluids or cooling lubricants, as well as signals and safety technology. Furthermore, it is possible to transmit a wide variety of media simultaneously. To transfer media, the required hoses and lines are routed from the outside to the adapter. "From the outside" here does not mean routed through the work spindle, but rather separately or separately. The media supply line therefore leads to the adapter separately and / or independently from the work spindle.

[0032] An exemplary workflow for an advantageous method for operating a machine tool may initially include the step of inserting a corresponding tool into the standard tool holder of the work spindle. In the next step, the extension adapter or adapters can be placed onto the work spindle (preferably automatically) and clamped. The adapter can then provide additional media for workpiece machining, i.e., media that can be provided in addition to the tool in the standard tool holder of the work spindle. For example, when machining a workpiece, the tool in the standard tool holder of the work spindle can be activated simultaneously with the functional unit of the extension adapter.

[0033] In one example, a milling tool would be clamped in the standard tool holder of the work spindle to enable milling of the workpiece. At the same time, an interchangeable adapter or extension adapter could be provided on the work spindle, which supplies an additional medium, such as cooling lubricant and compressed air, to the workpiece machining area. The cooling lubricant and / or compressed air can thus be introduced by the milling tool during the milling process. Advantageously, the extension adapter can also be controlled independently of the work spindle's tool.

[0034] If, for example, the tool and adapter ring are no longer required after machining, they can be conveniently stored automatically in a storage location.

[0035] In a further advantageous embodiment, the extension adapter can, for example, have an electrical interface such that the adapter is powered by a battery. The battery can also advantageously be stored at the storage location and can also be charged there, as well as software updates. Such an extension adapter, which is powered by a battery, can, for example, have an additional lighting unit, which can provide additional light during a work process through the work spindle or additional lighting in the machining area or on the tool clamped in the work spindle.

[0036] However, it would also be possible to equip this extension adapter, which includes a battery, with various sensors, such as a temperature sensor, thus enabling flexible monitoring of a machining process using the inserted extension adapter. The combination of different media in one extension adapter is particularly advantageous. For example, an extension adapter can enable temperature measurement via a corresponding sensor and simultaneously allow the supply of compressed air, so that, for example, the temperature in the machining area can be recorded via the temperature measurement and directly influenced by applying compressed air.

[0037] This effect on the machining area would be advantageous in addition to a tool that is already clamped in the work spindle and acting on the workpiece. For example, with a milling tool, where the milling cutter is clamped in the work spindle using the standard tool holder, temperature measurement and the supply of compressed air and / or cooling lubricant can be additionally enabled via the adapter ring. The production of workpieces is thus significantly more flexible and precise than with conventional workpiece machining. Furthermore, the manufacturing process is more efficient, as the provision of appropriate extension adapters enables extremely flexible machining of a workpiece and avoids the need to unclamp it.

[0038] In a further advantageous embodiment, the extension adapter has a manipulator, for example a robot arm, as a functional unit. This additional robot arm, when the extension adapter is swapped onto the work spindle, enables additional manipulation directly in the area of ​​the tool on the work spindle. Thus, a welding process can advantageously be integrated into a standard machining process, for example, via a corresponding welding device as a functional unit, which is attached to the manipulator. Furthermore, a functional unit for waterjet cutting would also be conceivable; this unit is integrated into the extension adapter and thus enables waterjet cutting directly on the work spindle. In a further embodiment, an attachment of an auxiliary spindle can be designed as an extension adapter.For example, if gear spindles are used, an attachment spindle can be attached, which makes the machine particularly suitable for finishing operations. The extension adapter can also advantageously be a tool for modifying the tool properties, for example, for hardening.

[0039] To enable automated, fast, and secure clamping of the extension adapter to the work spindle, a quick-clamping system can advantageously be provided. For this purpose, the extension adapter can, for example, have one or more connecting bolts that can be inserted into corresponding receiving openings in the area of ​​the stator of the work spindle and can advantageously be automatically clamped there, so that the extension adapter can be securely and firmly fastened in the stator area of ​​the work spindle. The clamping device can, for example, be operated hydraulically or electrically to enable automated clamping of the extension adapter. The stator area of ​​the work spindle is therefore the housing area or the housing of the work spindle, which does not rotate with the rotor of the work spindle.However, the stator area of ​​the work spindle also moves linearly together with the work spindle when the work spindle is moved.

[0040] The work spindle of a CNC-controlled machining center serves to hold the tool and is directly driven by its own motor. The standardized tool holder makes the work spindle particularly easy to load, allowing the use of an SK or HSK holder, for example. This makes the operation and use of the tool changer particularly simple, eliminating the need for manual clamping of tools. The extension adapter can also be automatically interchangeable and located outside the tool interface in the stator area of ​​the work spindle. For example, a clamping system can be provided on the stator area of ​​the work spindle via a mounting flange to enable automatic clamping of the extension adapter. This clamp or clamping device for clamping the extension adapter can, for example, have a spring assembly and a collet chuck.

[0041] The tool holder can, for example, have an inner cone. The contour of the inner cone can be adapted to the conical outer contour of a shank section, for example, of the tool to be clamped. The shank section can be designed, for example, as a steep taper, a hollow shank taper, or even a Morse taper. Tool holders with a cylindrical receiving contour that can be hydraulically actuated are also possible. The tool can be coupled or uncoupled via control signals to the tool clamping system of the work spindle. To pick up a new tool, the work spindle can be moved to a receiving position provided in the area of ​​the tool changer or the tool storage area.

[0042] Advantageous embodiments and further details of the present invention are described below using various exemplary embodiments with reference to schematic figures. The invention is explained in more detail in the schematic drawings.

[0043] Short description of the characters

[0044] Figure 1 shows a first representation of an extension adapter on a work spindle;

[0045] Figure 2 shows a further illustration of an extension adapter clamped to a work spindle of a machine tool;

[0046] Figure 3 shows an extension adapter with integrated storage, which is clamped to a work spindle, with no media supply lines provided;

[0047] Figure 4 shows a work spindle with an additional clamping device which is designed to accommodate the extension adapter;

[0048] Figure 5 shows the back of an extension adapter.

[0049] Detailed description of preferred embodiments

[0050] In the following, exemplary embodiments of the present invention are described in detail using exemplary figures. The features of the exemplary embodiments can be combined in whole or in part, and the present invention is not limited to the described exemplary embodiments. In the figures, identical elements are provided with identical reference numerals. Therefore, a repeated description is omitted where appropriate.

[0051] The individual and series machining of workpieces in modern metal-cutting machine tools demands the highest levels of accuracy and strict adherence to the tightest tolerance ranges. To achieve and maintain these high specifications, the components involved in the machining process—i.e., the workpieces with their workpiece carriers (pallets), as well as the tools with their tool holders and work spindles—must be positioned and locked with high precision. Of particular importance are the chips generated by the tool during machining, which fly around the work area and deposit on the components. Particular problems arise when external hose lines in the work area R cause additional disruptions to the machining process.

[0052] Therefore, an extension adapter 1 is proposed which can provide an additional medium via a media supply or reservoir separate from the work spindle 2. The additional medium can be supplied separately from the (internal) media of the work spindle. In addition, a flexible supply line 14 connected to the extension adapter 1 is proposed, so that an external supply is possible separate from the (internal) media of the work spindle 2. The supply line 14 is also arranged separately from the work spindle 2 and is preferably not directly connected to it. In addition, the flexible supply line 14, together with the extension adapter, is designed to be replaceable, so that no permanent hose lines centrally in the work space R or on the work spindle cause additional disruptions to the machining process. Figure 1 shows a first representation of an extension adapter (adapter ring) 1, which is held on the work spindle 2 via a clamping device 3.The extension adapter 1 is designed here as an adapter ring, so that the tool W can be passed through the central opening of the extension adapter 1, which is located in the center of this adapter. The tool W can, for example, be a standard tool (milling cutter, drill, etc.) that is clamped in the work spindle 2. In this state, it is therefore possible for the tool W to be at least partially surrounded by the extension adapter 1 in a state in which the tool W is clamped in the work spindle 2.

[0053] The work spindle 2 is provided on a movable traveling column B via the spindle holder 23. The traveling column B is preferably linearly movable in various axes, for example in the vertical and / or horizontal direction.

[0054] This design makes it possible to flexibly move the work spindle 2 within the work space R. To enable this mobility of the traveling column B, respective horizontal and vertical carriages can be provided. Rotation of the work spindle 2, which is accommodated via the spindle mount 23, is also possible, since a pivot bearing of the work spindle 22 is provided, thus also enabling a rotary movement of the work spindle 2. Such a rotary movement makes it possible to spatially change the orientation of the longitudinal axis of the work spindle 2, which, for example, is also the rotational axis of the work spindle 2, within the work space R.For example, the horizontal alignment of the rotational axis of the work spindle 2 shown in Figure 1 can be converted into a vertical position by a corresponding rotation of the spindle mount 23 using the pivot bearing 22 of the work spindle 2, so that the tool W is no longer aligned horizontally, but vertically. A vertically aligned tool W thus has a longitudinal axis parallel to the vertical axis. In the front area of ​​the work spindle 2, in other words, the area facing the machining area of ​​the work spindle 2, the clamping device 3 is provided on a stator 21 or a spindle housing of the work spindle 2. The clamping device 3 is thus provided on the non-rotating part of the work spindle 2.This part surrounds the central rotor part, in which a tool part W is accommodated and can be set into a rotary movement via the rotor part of the work spindle in order to be able to carry out, for example, a turning process or milling process using tool W.

[0055] The clamping device 3 can thus be provided on a flange of the stator 21 of the work spindle 2. For example, the clamping device 3 can be screwed to such a flange. To enable automated clamping by the clamping device 3, it can also be connected to the work spindle 2 via an electrical or hydraulic control.

[0056] The extension adapter 1 is accommodated on the clamping device 3 shown in Figure 1. For this purpose, the extension adapter 1 has, for example, various receptacles 11, which can in particular be designed as bolts, in order to interact with the clamping device 3 and enable clamping in the clamping device 3. As shown by way of example in Figure 1, the extension adapter 1 can have four spaced-apart receptacles 11, which are arranged, for example, evenly around the central opening of the extension adapter 1. These receptacles 11 can be inserted into corresponding counterparts of the clamping device 3 in order to enable clamping of the extension adapter 1 in the clamping device 3 and to enable a fixed reception of the extension adapter 1. The fixedly mounted extension adapter 1 thus moves together with the work spindle 2 in the linear direction corresponding to the travel path of the traveling column B.In Figure 1, the work spindle 2 also has the clamped tool W, which is guided through the central opening of the extension adapter 1. Through the rotary movement of the work spindle 2, or the rotational movement for driving the tool W for the machining process, an independent control of the work spindle 2 from the extension adapter 1 can be achieved. On the front surface 13, the extension adapter 1 can, for example, have functional units. These functional units can, for example, be a plurality of nozzles which are designed to introduce lubricant or coolant into the area of ​​the tool W. The independent media supply of the extension adapter therefore enables the introduction of additional media into the area of ​​the clamped tool W and thus, when machining by the tool W on the machine table or workpiece E, the introduction of media directly into the machining area of ​​the workpiece.

[0057] A special feature of the illustrated embodiment, in addition to the various possible functional units that can be provided on the extension adapter 1, is the flexible supply line or media supply 14, which enables independent supply of media directly into the extension adapter 1. The media supply to the extension adapter 1 is therefore independent of the media of the work spindle 2. Unlike media that are supplied, for example, via the spindle mount 23, usually integrated into the work spindle 2 via the stator or spindle housing 21, in order to be directly available in the work spindle 2, the flexible supply line 14 is provided independently of the design of the movable traveling column B. The flexible supply line 14 is therefore also spaced apart from and independent of the spindle mount 23, the pivot bearing 22, and the stator or stator housing 21 of the work spindle.The flexible supply line 14 of the extension adapter 1 is therefore connected directly to the extension adapter 1 to enable direct media supply to the extension adapter.

[0058] On the opposite side of the flexible supply line 14 or the media supply of the extension adapter 1, a connection with a media supply section Z of the machine tool can be located. The media supply section Z can supply the flexible supply line 14 with, for example, compressed air, oil, etc., depending on the required media in order to make this medium available to the extension adapter 1. In a particularly advantageous embodiment, the media supply section Z has a winding unit that can wind up the flexible supply line in order to minimize the cable area in the work space R (automatic cable retraction). For example, an automated and preferably pivoting cable reel with a drum can be provided for this purpose.

[0059] The movable traveling column B, as shown in Figure 1, enables, for example, vertical and / or horizontal movement of the work spindle 2. This possibility of moving the traveling column B therefore also enables automated replacement of an extension adapter 1. In order to replace this extension adapter 1, for example, the work spindle 2 can be moved, as shown in Figure 1, for example in a vertical direction in order to reach the area of ​​the storage location 4.

[0060] The storage location 4 can, for example, be provided directly in the work space R of the machine tool. In this storage location 4, various receiving locations are provided, which are configured to accommodate various types of extension adapters 1 and make them available to the work spindle 2. In an advantageous embodiment, the storage location 4 can accommodate at least one extension adapter 1, for example in addition to the flexible supply line 14 of the extension adapter 1. In an advantageous configuration of the storage location 4, this has a receiving plate 42, which is designed as a base plate and can, for example, be firmly connected to the frame of the machine tool. A bearing holder 43, which can advantageously be movable, can be accommodated via storage location rails 41.The bearing holder 43 can, for example, have two opposite side surfaces, which can be connected by a connecting surface orthogonal thereto, in order to thus provide a clamp-like receiving unit into which an extension adapter 1 can be inserted in order to be stored there accordingly. In an exemplary machining process, the work spindle 2 shown in Figure 1, in which the tool W is clamped, can be moved together with the extension adapter 1 towards a workpiece. The workpiece is, for example, fixedly held on the workpiece table E. The linear travel of the work spindle is ensured by the movable traveling column B. To start machining, after the work spindle 2 has been moved, for example, into the area of ​​the workpiece, the rotational movement of the clamped tool W can be initiated by activating the rotor of the work spindle 2.

[0061] At the same time, and preferably independently of this, the extension adapter can be used during workpiece machining to direct compressed air or cooling water, for example, to the tool W via corresponding functional units, for example nozzles on the front surface 13 of the extension adapter 1. This can, for example, influence or reduce the temperature development during workpiece machining by the tool W.

[0062] Since the work spindle 2 is also designed to be linearly movable during machining by the tool W, for example by corresponding movement of the traveling column B, the flexible supply line 14 ensures that the extension adapter 1 is also moved parallel to the movement of the traveling column B. The flexible supply line 14 can, for example, be designed as a spirally arranged line, which is advantageously designed to be elastic in order to enable movement with the traveling column B with as little resistance as possible. The extension adapter 1 can advantageously comprise a separate control unit in order to enable independent and separate control of the media supply via the extension adapter 1 from the work spindle 2. After a completed machining process, the traveling column B can again be moved towards the storage location 4, for example to deposit the extension adapter 1.To deposit the extension adapter 1, after the traveling column B has moved the extension adapter 1 directly into the storage holder 43, the clamping device 3 is operated in such a way that the clamped extension adapter 1 can be released from the clamping device 3. After release, the traveling column B can again move freely within the work space R, with the extension adapter 1 accommodated in the storage location. The work spindle 2 can then, for example, change the tool W. If an additional function is required for a further or future work step, this function can again be provided by exchanging the extension adapter 1.

[0063] Thus, an extension adapter 1 is proposed, which is designed as an adapter ring and which can provide a medium, for example, via an integrated media reservoir and / or via a media supply separate from the work spindle 2. The medium is an additional medium that can be supplied separately from the media of the work spindle. The flexible supply line 14 or media supply of the extension adapter 1 is an external supply separate from the media of the work spindle 2, which media are integrated into the work spindle 2 and supplied, for example, via the movable column B. The flexible supply line 14 is also arranged at a distance from the work spindle 2 and is preferably not directly connected to it.In addition, the flexible supply line 14 or media supply is replaceable with the extension adapter such that when the extension adapter 1 is replaced, the flexible supply line 14 can also be removed from the area of ​​the work spindle 2 at the same time. This allows the work spindle 2 to move freely after the replacement process and thus prevents permanent hose lines in the work space R from causing additional disruption to the machining process. The extension adapter 1 can therefore be designed to be replaceable and mounted on the spindle to provide various spindle-independent media, so-called additional media. This additional media can be transferred to the tool without it having to be fed through the spindle. This enables particularly flexible and efficient machining of workpieces.The extension adapter 1 can therefore only be used for the specifically required processing and therefore does not restrict other standard processing operations.

[0064] Figure 2 shows a further illustration of the extension adapter 1 on the work spindle 2. In this illustration, the work spindle 2 does not have a tool W. Thus, it is clearly evident in Figure 2 that the extension adapter 1 has a centrally located opening which allows the tool W to be inserted into the spindle 2. Thus, Figure 2 shows the opening 25 of the extension adapter 1. This opening is preferably concentric with the insertion opening of the work spindle 2 for the tool W. For example, a tool W can thus be inserted at least partially or completely through the opening 25 in order to be clamped into the work spindle 2. The extension adapter 1 shown in Figure 2 comprises four separate receiving locations: the first receiving location 18, the second receiving location 17, the third receiving location 16, and the fourth receiving location 19.

[0065] These receiving points are arranged separately from one another on the circumference around the opening 25. Via these receiving points, a connection can be achieved with the clamping device 3 arranged on the rear of the extension adapter 1. For example, corresponding bolts are provided at the receiving points, which can be inserted into openings in the clamping device 3 in order to be clamped with the clamping device 3, so that a firm and secure clamping of the extension adapter 1 can be achieved. The clamping option of the extension adapter 1 is also designed such that a firm connection is achieved in the clamped state, so that machining by a functional unit of the extension adapter 1, for example an additional tool, is enabled safely and precisely. The front surface 10 of the extension adapter 1 is arranged orthogonal to the longitudinal axis of the work spindle 2.A connection point 15 is provided on the side of the body of the extension adapter 1. The connection point 15 serves as a connection for the additional media to be supplied to the extension adapter 1. The connection point 15, in turn, can be connected to a media supply section Z of the machine tool via the flexible supply line 14. Via the media supply section Z, a medium can be supplied directly into the flexible supply line 14, the connection point 15, and then into the extension adapter 1. As a functional unit in Figure 2, the extension adapter 1 is designed with nozzle units in the area around the opening 25. These nozzle units are shown as holes or bores that are aligned towards the tool. This enables the supply of coolant via the extension adapter 1 and the flexible supply line 14.However, other units can also be provided on the extension adapter 1 as functional units. For example, the extension adapter can have an additional manipulator as a functional unit. Such a manipulator can, for example, be a robot arm, which is therefore arranged in the tool area of ​​the work spindle 2 on the extension adapter 1. The manipulator can be controlled separately from the work spindle 2 in order to be able to carry out manipulation in the area of ​​the workpiece, for example. In one application, the manipulator can therefore be used, for example, to remove chips from the machining area during a machining process by moving the manipulator accordingly. The manipulator can also be used to change the clamping position of the workpiece. In addition, the manipulator can be used to exchange the workpiece, for example in a similar way to robot loading.

[0066] Another particularly advantageous option is the embodiment with a functional unit that is an auxiliary spindle. The auxiliary spindle unit can, for example, comprise a spindle for driving a drilling tool clamped to the spindle. Furthermore, a drive can be provided for exerting a force on the auxiliary spindle unit and an electromagnetic actuator for exerting a compensating force on the auxiliary spindle unit that opposes the force of the drive. In a further advantageous embodiment, the functional unit can be designed as a grinding unit. Thus, the extension adapter 1, after being swapped onto the work spindle 2, can function as an additional grinding unit in addition to the tool E. Thus, a functional unit is proposed that has its own drive, for example, an electric motor.The grinding unit can be used together with the tool W of the work spindle 2, or separately, for example, after replacing the tool W. By providing an extension adapter with a grinding unit, grinding is enabled, for example, on a CNC universal machine tool. The functional unit can, in particular, also include a grinding wheel.

[0067] In a further advantageous embodiment, the functional unit of the extension adapter is designed as a waterjet cutting tool. The functional unit thus enables waterjet cutting using the extension adapter 1 inserted into the work spindle 2. The media for operating the functional unit is supplied via the separate media supply 14 or via an integrated media reservoir. The adapter body 10 is detachably connected to the stator side of the work spindle 2 at the clamping point.

[0068] In a further advantageous embodiment, the functional unit is designed as a deburring tool. Using its own drive, the deburring tool of the extension adapter, for example, can be used independently of any rotational movement of the work spindle 2.

[0069] The functional unit can also advantageously comprise a measuring device. The measuring device can, for example, measure distances, temperatures or optically detect the tool or the workpiece present in the processing area and transmit this information to a control unit. A functional unit comprising such a measuring device can thus

[0070] Further increase machining accuracy. The functional unit can also include a welding device or a laser head. By inserting the extension adapter 1, it is thus possible to perform a welding process or a machining process using a laser via the movable work spindle 2. The media required to operate the functional unit are provided via the separate media supply 14 or via an integrated media storage unit.

[0071] The functional unit can therefore be designed such that an influence on the tool W, which is clamped in the work spindle 2, can be achieved. However, the functional unit can also be configured such that an influence on a workpiece clamped on the workpiece table E is possible.

[0072] The provision of the additional medium enabled by the flexible supply line 14 or media supply can in particular comprise the supply and / or removal of fluids, gases and / or solids. In particular, a supply of compressed air, hydraulic fluid, cooling lubricant and water is possible. A supply of control signals, sensor signals and safety signals can also be enabled via the flexible supply line 14. The supply of solids, such as a powder, can also be enabled in order to expand corresponding functions for the functional unit. A supply of welding wire is also possible when using a welding device as the functional unit. The supply of electrical energy can also be enabled via the flexible supply line 14, for example to power a drive on the extension adapter 1.Particularly advantageously, the expansion adapter 1 comprises a combination of two or more functional units, as described. For example, a first functional unit can be configured as a measuring device and a second functional unit as a waterjet cutting tool or welding device.

[0073] The extension adapter 1 can comprise the adapter body 13, which is designed as a ring and can at least partially enclose a tool W clamped in the work spindle TI through the ring opening 110. The adapter body 13 can also comprise an energy storage device, which is, for example, an electrochemical energy storage device. In addition, the extension adapter 1 can advantageously also have its own control unit, which can be integrated into the extension adapter. Thus, the extension adapter 1 shown in Figure 2 with the flexible supply line 14 enables multifunctional use of the work spindle 2. The work spindle 2 shown in Figure 2 also has the housing 24. The interface 12 of the extension adapter 1 is symbolically the media interface of the extension adapter for supplying the additional medium. The interface 12 can also be a functional unit, as described above.

[0074] The functional unit can also be designed with the interface 12, for example, as a coolant supply nozzle. One or more coolant supply nozzles, as shown, for example, in Figure 2, can be arranged in the circumferential area, along the annular opening 110 and the opening 25. These nozzles can advantageously be inclined relative to the axial axis of the work spindle 2 in order to direct a corresponding coolant supply into an area in which the tool W can be clamped.

[0075] Figure 3 shows another embodiment of the extension adapter 1. In this embodiment, the extension adapter 1 comprises an integrated media storage device. The integrated media storage device is integrated, for example, into the adapter body and provides electrical energy, for example. The energy storage device can therefore be an electrochemical energy storage device, for example. A control unit can also be integrated, which can input and output signals. The energy storage device thus allows the extension adapter 1 to be operated independently of the power supply of the work spindle 2.

[0076] Another view of the extension adapter 1 is shown in Figure 4. In this

[0077] In the figure, the extension adapter 1 is accommodated in the storage location 4. The clamping device 3 is shown in the stator area of ​​the work spindle. The clamping device 3 has, in particular, a through-bore which allows access to the clamping point of the work spindle 2. The clamping device 3 is accommodated on the housing 21 of the work spindle 2. The clamping device has various bores, for example the first bore 31, second bore 36, and third bore 33, which can be used to accommodate bolts of the extension adapter 1 and enable quick clamping of the extension adapter 1. In addition, the clamping device 3 has a protruding shaft section 35 onto which the extension adapter 1 can be placed in order to be securely fastened to the clamping device 3.The illustrated extension adapter 1, which is accommodated in storage location 4, has, for example, bolts at the various receiving points 16 and 19, which protrude from the rear of the extension adapter 1 to be inserted into the corresponding openings of the clamping device 3. The connection for the media supply is provided on the side of the extension adapter 1. As shown, the connection line for the media supply to the extension adapter 1 is shown together at storage location 4 in Figure 4. The work spindle, which therefore does not have an extension adapter 1 inserted, is thus free of any additional media supply lines, allowing free movement of the work spindle 2.Since the flexible supply line 14 is also arranged laterally at the edge of the working space R, in particular in the area of ​​a side wall of the working space R, the working space is not impaired by an extension adapter with flexible supply line 14 located in the storage location 4.

[0078] Figure 5 shows an exemplary embodiment of an extension adapter, wherein the view shown in Figure 5 represents the rear side of an extension adapter 1. The rear surface A14 is thus designed, for example, as a contact surface for contacting the front surface of the clamping device 3. The extension adapter 1 can be inserted into the respective receiving bores of the spindle device 3 via the contact bolts A6, A7, A8, and A9. Openings 31, 36, and 33 of the clamping device 3 are provided for this purpose, for example. The supply Z can be provided on the side of the extension adapter 1 to enable an independent media supply directly into the extension adapter 1. The ring opening 110 enables the extension adapter 1 to be placed on the shaft section of the clamping device 3, as shown, for example, in Figure 4, see shaft section 35.For example, a functional unit of the expansion adapter 1 can be connected via the functional section 5. Preferably, the edge surfaces between an adapter surface A1 and an adapter side surface A3 are formed as rounded edges A2. It should be emphasized that the present invention is in no way limited or restricted to the exemplary embodiments described above and their design features, but rather further encompasses modifications of the exemplary embodiments, in particular those encompassed by modifications of the features of the described examples or by combining one or more of the features of the described examples within the scope of protection of the independent claims.

Claims

Patent claims 1. An extension adapter (1) for a work spindle (2) of a machine tool for expanding the machining functions and / or for providing additional media to the work spindle (2), wherein the extension adapter (1) comprises an adapter body (10) which has at least one clamping point for releasably connecting to a stator side of the work spindle (2); wherein the extension adapter (1) has an interface (12) for providing at least one medium (M), and wherein the extension adapter (1) has an integrated media reservoir and / or a media supply (14) for the at least one medium (M), which is separate from the work spindle (1).

2. Expansion adapter (1) according to claim 1, wherein the expansion adapter (1) has a functional unit which is operated by means of the at least one medium (M) provided via the interface (12).

3. Extension adapter (1) according to at least one of the preceding claims, wherein the at least one medium (M) is an additional medium which can be supplied separately from media of the work spindle (2).

4. Extension adapter (1) according to at least one of the preceding claims, wherein the functional unit is provided for acting on a tool clamped in the work spindle (2).

5. Extension adapter (1) according to at least one of the preceding claims, wherein the functional unit is a manipulator, an auxiliary spindle, a coolant supply nozzle, grinding unit, grinding wheel, angle head, water jet cutting tool, deburring tool, measuring means, gripper, optical element, powder nozzle, laser head, welding device, hardening device and / or a tool for acting on another tool or a workpiece.

6. Extension adapter (1) according to at least one of the preceding claims, wherein the separate media supply (14) comprises a flexible line for supplying and / or removing compressed air, hydraulic fluid, cooling lubricant, control signals, sensor signals, water, safety signals, powder, heat, welding gas, welding wire, laser light, chips, and / or electrical energy, and wherein the flexible line is arranged outside a housing (23) of the work spindle (2).

7. Extension adapter (1) according to at least one of the preceding claims, wherein the adapter body (13) is designed as a ring such that a tool (W) clamped in the work spindle (2) can be passed through the ring opening (110).

8. Extension adapter (1) according to at least one of the preceding claims, wherein the energy storage device is a rechargeable storage element, in particular an electrochemical energy storage device.

9. Extension adapter (1) according to at least one of the preceding claims, wherein the at least one medium (M) is one of the following media: hydraulics, pneumatics, electricity, water, safety signals, powder, heat, welding gas, welding wire, laser light, chips.

10. Machining unit for a machine tool, comprising: a work spindle (2) with a tool holder (25); a housing (23) which at least partially encloses the work spindle (2), wherein the work spindle (2) is a movable work spindle (2) with an additional clamping means (3) in the region of the tool holder (25); and at least one replaceable extension adapter (1) according to claim 1, which can be clamped to the additional clamping means (3).

11. Machining unit according to the preceding claim, wherein the additional clamping means (3) is arranged separately from a tool clamping means (25) of the work spindle (2) and is preferably separately operable.

12. Machining unit according to at least one of the preceding claims 10 or 11, wherein the additional clamping means (3) is detachably fastened to a stator side of the work spindle (2), in particular the housing (23).

13. Machining unit according to at least one of the preceding claims 10 to 12, wherein the extension adapter (1) is configured to supply the additional medium independently of the rotational movement of the work spindle (2) and / or wherein the extension adapter (1) is configured to carry out the additional function independently of the rotational movement of the work spindle (2).

14. Machining unit according to at least one of the preceding claims 10 to 13, wherein the functional unit is configured to machine a workpiece simultaneously with a tool (W) clamped in the work spindle (2).

15. Machining unit according to at least one of the preceding claims 10 to 14, wherein the additional clamping means (3) is a quick-clamping system for the automated clamping of the extension adapter (1).

16. Machining unit according to at least one of the preceding claims 10 to 15, wherein the additional clamping means is attached to an annular flange of the housing (23), and the annular flange at least partially encloses the work spindle (2).

17. Machining unit according to at least one of the preceding claims 10 to 16, wherein the media supply (14) comprises a media feed line which is a flexible line and is arranged separately from the work spindle (2) and is designed to be movable together with the work spindle (2).

18. Processing unit according to at least one of the preceding claims 10 to 17, wherein the extension adapter (1) is interchangeable in order to the stator side of the work spindle (2) to be changed, preferably automated.

19. A method for operating a machine tool, with a supplementary adapter according to claim 1, the method comprising the step of providing at least one medium (M) on the work spindle (2) of the machine tool, by means of the extension adapter (1), wherein the at least one medium (M) is an additional medium which can be supplied separately from media of the work spindle (2) and / or is present in the extension adapter (1).

20. The method according to claim 19, comprising the step of machining a workpiece by means of a tool (W) which is accommodated in the work spindle (2) and the functional unit of the supplementary adapter (1), the tool (W) being connected to the extension adapter (1).

21. Method according to claim 20, comprising the step of exchanging a supplementary adapter (1) by moving the work spindle (2) to a storage location (4) and automatically or manually clamping a supplementary adapter (1) in the additional clamping means (3).

22. A computer program product comprising instructions which, when executed by a computer, cause the computer to carry out the method according to claims 19 to 21.

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