NOZZLE ARRANGEMENT AND MACHINE TOOL WITH A NOZZLE ARRANGEMENT

Description

[0001] The present disclosure relates to a nozzle arrangement for supplying cooling lubricants (CLS) and cooling lubricants, as well as to a machine tool having such a nozzle arrangement. Furthermore, the present disclosure relates to the use of a nozzle set for forming such a nozzle arrangement.

[0002] From DE 10 2016 103 202 A1, a method for providing a fluid supply device for special use in a processing zone of a processing machine is known, comprising the steps of a) computer-aided definition of the 3-dimensional configuration of the processing zone, taking into account the workpiece and the tool to be used to process the workpiece in the processing zone of the processing machine; b) computer-aided definition of the 3-dimensional shape and position of at least one specifically adapted outlet nozzle of the fluid supply device, incorporating information defined in step a); c) providing a data set describing the 3-dimensional shape of this outlet nozzle; and d) using the data set to manufacture this outlet nozzle by means of a numerically controlled manufacturing process.

[0003] US 2017 / 203401 A1 shows a drilling machine tool with a nozzle arrangement for cooling air, which also serves for chip removal. WO 2011 / 106801 A2 describes a nozzle arrangement for coolant supply. EP 1 495 840 A1 describes a nozzle for a coolant. US 2016 / 297042 A1 describes a milling tool with integrated coolant channels. WO 2009 / 148680 A2 describes fluid lines for fuels for gas turbine engines.

[0004] DE 10 2016 103 202 A1 proposes that outlet nozzles be designed and manufactured individually and for specific applications. This is done specifically with a specific processing zone, i.e., a specific application, in mind.

[0005] Machine tools, such as grinding machines, for example cylindrical grinders, are known in the prior art. Cylindrical grinders can have rotationally symmetrical tools, such as grinding wheels. These can interact with a workpiece in a suitable manner to remove material. Cylindrical grinders can, for example, be designed for external cylindrical grinding, internal cylindrical grinding, and also for plunge-cut grinding or oblique plunge-cut grinding. In addition to grinding wheels, grinding belts can also be used for cylindrical grinding. In addition to rotationally symmetrical workpiece surfaces, eccentrically shaped workpiece surfaces can also be machined if the workpiece holder and a tool unit, such as the spindle head, can be driven in a suitable manner and moved relative to one another. In this way, camshafts, crankshafts, or similar workpieces with eccentric geometries can be machined or ground.Furthermore, machine tools are known that allow combined machining of workpieces, such as combined grinding and turning machines.

[0006] A workpiece to be machined can be held between two centers of a workpiece holder or on one side of a workpiece holder. Another known method is centerless grinding, in which the workpiece is not (axially) held between centers in the grinding machine. Instead, the workpiece can be held and guided by support rails, regulating wheels, guide rollers, steady rests, or similar devices.

[0007] Cutting fluids (or cooling lubricants) are of great importance in metal-cutting operations, especially grinding, for achieving achievable performance, maximizing tool life, and meeting desired quality requirements. Cutting fluids dissipate heat and reduce friction between the tool and workpiece. Cutting fluids are also used for chip removal and the removal of tool wear.

[0008] Nevertheless, cooling lubricants represent a significant cost factor. Furthermore, cooling lubricants can pose a significant environmental burden. Against this backdrop, cooling lubricant management is of considerable importance for machine tools. When supplying a machine tool with cooling lubricants, the goal is usually to achieve the desired performance values ​​and machining results with minimal stress on the workpiece, tool, and machine, and with the lowest possible use of cooling lubricants.

[0009] There are established solutions for applying cooling lubricants at the desired location and in the desired direction and / or spray shape, such as the Loc-Line system from Lockwood Products, Inc., USA. The system comprises flexible arms with integrated fluid channels that are three-dimensionally deformable and can be equipped with nozzles.

[0010] However, it has been shown that such systems can reach their limits when the task is to achieve the desired target values ​​in terms of performance, service life and quality with the lowest possible use of coolant. This applies, for example, to certain applications in grinding, particularly in those applications where a long line of contact (i.e. a wide grinding wheel) is used to increase the stock removal rate. In such cases, it is desirable to introduce the cooling lubricants into a gap between the tool and workpiece in such a way that the entire area is wetted or surrounded by the workpiece along the length of the line of contact. If heat is not dissipated efficiently during grinding, so-called grinding burn, i.e. thermal damage to the workpiece, must be expected.

[0011] EP 1 772 233 A1 discloses a nozzle arrangement for supplying coolant lubricant, which comprises a distributor block and a plurality of needle-shaped nozzles arranged side by side. With such a design, it is already possible to use wide nozzle designs with a pronounced longitudinal extension to ensure complete wetting when machining with wide grinding wheels. However, it has been shown that even this design does not provide an optimal solution for every application. For example, the flow guidance contour in the nozzle arrangement, for example at the transition between the distributor block and the needle nozzles mounted thereon, is not optimally designed due to its design.

[0012] Against this background, the present disclosure is based on the object of specifying a nozzle arrangement, a machine tool, in particular a grinding machine, provided with such a nozzle arrangement, and a use of a nozzle set to form a nozzle arrangement that contribute to further increasing the performance and efficiency of the coolant supply. In particular, the aim is to ensure the most optimal coolant supply possible with the lowest possible coolant usage. This should ultimately contribute to reducing coolant consumption and, if possible, to lowering operating costs.

[0013] In addition, the nozzle arrangement should be designed to be as aerodynamic as possible to enable optimal use of the cooling lubricants. This should increase the efficiency of heat dissipation as well as the removal of chips and abrasion. Furthermore, the friction conditions between the workpiece and the tool should be as favorable as possible.

[0014] In addition, a high degree of variant diversity should be provided with the smallest possible number of individual parts and with minimal assembly and setup effort in order to adapt the nozzle arrangement to a wide range of applications.

[0015] According to a first aspect of the present disclosure, the object of the invention is achieved by a modularly designed nozzle arrangement according to independent claim 1.

[0016] The object of the invention is thus completely solved.

[0017] At least one nozzle is formed from a material processable by an additive manufacturing process, in particular from plastic materials. In other words, at least one nozzle is manufactured by additive manufacturing or by so-called 3D printing. Manufacturing preferably takes place without post-processing of the internal flow guide contour.

[0018] A key advantage of additively manufactured components is the design freedom in the configuration of the flow contour. In other words, flow channels, transitions, deflections, and the like can be designed for optimal flow without having to consider the limitations of conventional forming, primary forming, or abrasive machining processes. This can significantly reduce the flow resistance of the nozzle assembly's flow contour. Pressure losses can be reduced. Cooling lubricants can be used more efficiently.

[0019] In this way, at a given flow rate and / or pressure of the cooling lubricant at the inlet of the nozzle assembly, the desired amount can be dispensed at high pressure and high velocity. This increases the flushing effect. Furthermore, it results in favorable lubrication and heat dissipation.

[0020] The cooling lubricant nozzle (also called a nozzle) is selected from a nozzle set comprising several nozzles, preferably belonging to several nozzle types. This allows the nozzle arrangement to be assembled modularly. The nozzles can differ, for example, in the arrangement / orientation of their outlet openings. Furthermore, the nozzles can differ in the effective flow cross-sections of the outlet openings.

[0021] It has been recognized that even nozzle arrangements made of plastic can achieve sufficient service life for the supply of coolant. Accordingly, the distribution block and the at least one coolant nozzle are preferably made primarily of plastic. This applies in particular to those sections that form the flow guidance contour or the flow channels. Consequently, the cooling lubricants can come into contact with the plastic materials. However, it has been shown that a sufficiently long service life is nevertheless achieved.

[0022] Nevertheless, it is also conceivable to manufacture at least one of the coolant nozzles and / or the distributor block from non-plastic materials. Processing metal materials or hybrid composites using 3D printing or other additive processes is now also conceivable.

[0023] The modular design of the nozzle assembly has the advantage of allowing for easy provision of various configurations. Furthermore, the modular design allows for easy creation of variants. In the event of wear or damage, it is possible to replace only those components that are actually affected.

[0024] The nozzle arrangement according to the present disclosure further takes advantage of the fact that plastic components can now be produced using additive manufacturing processes without, or essentially without, post-processing, while still exhibiting a sufficiently good surface quality. This applies in particular to the flow guidance contour with the flow channels inside the components. In other words, the flow resistance is not excessively increased by the surface structure of the walls of the flow channels. Consequently, this does not preclude application for the supply of coolant. No post-processing of the walls of the flow channels is required. However, this should not rule out the possibility that post-processing (removal, smoothing, coating, impregnation, etc.) may still be necessary under certain circumstances. Nevertheless, the (total) effort required for this is often far lower than with conventional manufacturing.

[0025] According to one embodiment, the nozzles are made of polymethyl methacrylate (PMMA) or a comparable acrylate. For example, manufacturing using a stereolithography (STL) process is suitable for this purpose. This combination of material and manufacturing process enables high surface quality, at least in relation to the field of additive manufacturing. Furthermore, this combination of material and manufacturing process allows the design and production of delicate structures with high resolution, so that flow channels in the nozzles can be finely structured. Effective flow cross-sections can be achieved, particularly at the outlet, with an achievable minimum bore diameter of a few millimeters down to 1 mm. This allows for good beam guidance and high-velocity discharge.

[0026] According to one embodiment, the distribution block is made of a polyamide (PA) or a comparable polymer. For example, manufacturing using a laser sintering process (SLS - selective laser sintering) is suitable for this purpose. While such a process does not achieve the surface quality and fine resolution of the STL process, it has been shown that the surface properties and resolution (ability to create delicate structures) achievable using SLS or comparable processes are entirely sufficient for use as a distribution block. Conversely, manufacturing from a polyamide or a comparable material offers high strength and sufficient toughness, at least with regard to the field of additive manufacturing.

[0027] The combination of two additive manufacturing processes or different materials that can be processed using additive manufacturing processes helps to ensure the desired properties. It is therefore advantageous if the distributor block is made of a material with relatively high strength and toughness. It is also advantageous if the at least one cooling lubricant nozzle is made of a material that enables the creation of delicate flow channels with good surface properties. Effective flow cross-sections in the distributor block are significantly larger than effective flow cross-sections in the at least one cooling lubricant nozzle. In this respect, there are no significant disadvantages if the distributor block is manufactured from a material or using a process that does not reach the ranges required for the cooling lubricant nozzle in terms of surface properties and resolution.Conversely, it is not absolutely necessary that the material or the manufacturing process for the coolant nozzle enables the strength or toughness required for the distributor block.

[0028] Preferably, the flow guidance contour in both the distribution block and the at least one coolant nozzle is designed to enable a flow that is as laminar as possible, while avoiding turbulence as far as possible.

[0029] The flow-optimized, curved structure cannot be produced using conventional ablation processes, or only with disproportionate effort. This applies particularly to bends, deflections, tapers, widenings, etc. Another advantage associated with additive manufacturing is the great design freedom. When designing the flow contour or flow channels, little or no consideration needs to be given to any limitations imposed by the manufacturing process(es).

[0030] According to an exemplary embodiment of the nozzle assembly, the distributor block further includes a connection for a coolant sensor. The coolant sensor is preferably a pressure sensor and / or flow sensor. The coolant sensor can be configured, for example, as a back pressure sensor, flow sensor, etc.

[0031] If a coolant sensor is installed, the cooling lubricant flowing through the nozzle assembly can be controlled, providing feedback on current flow conditions (pressure, flow rate, velocity, etc.). A signal provided by the coolant sensor can be used by a (higher-level) control system of the coolant supply to control a pump, control valves, or similar devices to achieve the desired flow characteristics. The signal provided by the coolant sensor can also be used to verify the current configuration of the nozzle assembly.

[0032] According to a further exemplary embodiment, the nozzle arrangement comprises a plurality of nozzles, each coupled to an outlet. In this way, a large effective effective length can be provided that can be wetted with the cooling lubricants. For example, the outlets on the distributor block are arranged next to one another in a row. The distributor block can, for example, comprise three, four, or five outlets arranged next to one another. Accordingly, the nozzles can be accommodated next to one another in the outlets on the distributor block. According to the above example, three, four, or five nozzles can be attached, which can belong to the same nozzle type or to different nozzle types. It is also conceivable to install fewer nozzles if unused outlets are closed off with blind plugs.

[0033] According to the invention, the outlets each have a seat for receiving a connection piece of the at least one nozzle. Preferably, the design of the seat is standardized at the outlets, so that nozzles can be easily moved from one outlet to another. According to another exemplary embodiment of the nozzle arrangement, installable coolant nozzles of different nozzle types have a uniform design of the connection piece. This simplifies the creation of the desired configuration of the nozzle arrangement.

[0034] According to another exemplary embodiment of the nozzle assembly, the nozzle has a stop plate, with the connecting piece extending from the stop plate. A position-locking element is arranged on the stop plate. When joined, the element engages a receptacle on the seat and, when mounted, defines a rotational position of the nozzle on the seat. This prevents incorrect assembly of the nozzle. Furthermore, the correct position of the nozzle can be simplified. The fluid can be guided in the desired manner.

[0035] According to a further exemplary embodiment of the nozzle arrangement, the connecting piece of the at least one nozzle carries a first seal arranged in a receiving groove, in particular a radially acting ring seal. For example, the seal can be designed as an O-ring seal.

[0036] According to an exemplary development of this embodiment, the receiving groove of the first seal is designed eccentrically or offset, at least slightly, from a longitudinal axis of the connecting piece. The offset can be a few tenths of a millimeter. For example, the connecting piece has a cylindrical contour that defines a longitudinal axis of the connecting piece. The cylindrical contour is adapted to a cylindrical contour (bore) of the seat of the receptacle. According to this exemplary embodiment, the groove for the first seal is slightly eccentrically offset both from the connecting piece and from the seat. This can include a design in which the groove is cylindrical, but one axis of the groove is offset from the longitudinal axis of the connecting piece. However, it is also conceivable to design the groove for the first seal non-cylindrical (e.g., oval or egg-shaped) in order to achieve the desired eccentricity or offset.

[0037] In other words, the groove has a shape oriented non-concentrically (eccentrically) to the longitudinal axis, which creates a preload that forces the connecting piece into a non-concentric (eccentric) orientation relative to the seat.

[0038] The slightly offset arrangement of the groove for the radially acting seal enables a defined radial preload (radially outward on one side) of the nozzle connection piece in the receiving seat on the distributor block. This has the advantage that, despite a certain amount of clearance between the connection piece and the seat, a defined nozzle mounting is possible. Ultimately, this allows a nozzle outlet to be positioned and oriented with high precision, allowing the coolant flow to be directed with the required accuracy.

[0039] The above measure illustrates that manufacturing using additive manufacturing can present challenges that can be overcome with unconventional solutions. When using traditional manufacturing processes, an obvious solution would be to manufacture the parts with greater precision to enable perfect or near-perfect concentric alignment between the locating pin and the seat. However, this is not possible with additive manufacturing. Accordingly, even a slight tilt between the locating pin and the seat may be acceptable, as this leads to reproducible alignment.

[0040] In this way, two additively manufactured components can be joined together, which must have a certain amount of play due to the manufacturing process.

[0041] According to the nozzle assembly of claim 1, a first seal and a second seal, in particular two ring seals, are provided between the seat and the connecting piece in the coupled state, wherein the first seal is designed as a radially acting seal and the second seal as an axially acting seal. According to the above embodiment, the radially acting (first) seal can be arranged at least slightly offset from the longitudinal axis of the connecting piece. However, this is not required in all embodiments.

[0042] The axially acting seal can be located, in particular, on a front side of the connecting piece facing the distributor block. A corresponding receiving recess or groove for the axially acting seal can be provided in the front side.

[0043] The advantage of combining two seals is that the risk of pressure losses, leaks, and the associated impact on flow conditions is very low. The seal can be installed at the outlet of the distribution block in a pressure-tight and fluid-tight manner.

[0044] According to the invention, a groove, in particular a circumferential groove, is formed on the connecting piece, which cooperates with a safety slide. For example, the safety slide can be inserted transversely or substantially transversely to a joining direction of the nozzle into the seat at the outlet of the distributor block in order to secure the position of the nozzle on the distributor block. The groove can be referred to as an insertion groove or safety groove. According to an exemplary embodiment, the groove for the safety slide is arranged on the receiving piece between the first seal and the second seal. The groove for the safety slide does not necessarily have to be completely circumferential, since the safety slide is usually only fed radially from one side and therefore does not have to completely encompass the connecting piece.

[0045] According to one embodiment, the locking slide can be inserted radially or similarly offset from the nozzle's joining direction into corresponding receiving slots on the distributor block. The locking slide can thus provide positive locking of the position when it engages the groove on the nozzle's connecting piece and the corresponding recesses in the distributor block's receiving seat.

[0046] According to another exemplary embodiment, the safety slide, when installed, pushes the nozzle axially into or against the seat. In other words, the nozzle connection piece, the seat of the distributor block, and the safety slide are designed such that, when the safety slide is inserted, a preload is created that acts axially on the connection piece. If an axially effective seal is installed on the connection piece, it is pushed toward a counter surface on the distributor block to increase the sealing effect.

[0047] According to another exemplary embodiment, the locking slide is designed to lock onto the connecting piece or into the receiving seat when inserted, thus providing positional security or preventing loss. It should be noted that during operation of the nozzle assembly, certain release forces act on the nozzle due to the prevailing flow and pressure conditions.

[0048] According to a further exemplary embodiment of the nozzle arrangement, outlets that are not provided with a nozzle are each closed by a blind plug. Accordingly, at least one blind plug can be installed in the nozzle arrangement if not all outlets are actually used. The at least one blind plug is also preferably produced by an additive manufacturing process from a plastic that can be processed using such a process. The blind plug can be made from the same material as the at least one coolant nozzle and based on the same manufacturing process. The blind plug preferably has a connecting piece that corresponds to the connecting piece of the at least one coolant nozzle. Accordingly, radially acting and / or axially acting seals can also be provided if required. Furthermore, a receiving groove / introduction groove for the safety slide can be formed.

[0049] According to another exemplary embodiment of the nozzle arrangement, at least one installed nozzle has a fanned-out fluid path. Such a fanned-out fluid path is preferably defined by an additively manufactured volume that forms the flow guidance contour with the flow channels. In this way, a fanned-out, linear, or approximately linear coolant jet can be generated.

[0050] According to a further exemplary embodiment of the nozzle arrangement, at least one installed nozzle has a branch that defines a plurality of outlet openings. This can be used to fan out the fluid path. The branch can again be defined by an additively manufactured volume that forms the flow guidance contour with corresponding flow channels. Such configurations cannot be produced, or cannot be easily produced, using ablation processes. According to this embodiment, the fanned-out cooling lubricant jet is generated by multiple (partial) jets. For example, a cooling lubricant nozzle can have three, four, or five outlet openings arranged next to one another. Overall, the jet can therefore be widely divided or widely fanned out by the nozzle arrangement.

[0051] Alternatively, it is also conceivable to design at least one of the cooling lubricant nozzles as a wide-slot nozzle. A wide-slot nozzle has a pronounced width-to-height ratio, with the width being a multiple of the height (approximately 5:1 up to 10:1 or even 20:1).

[0052] According to another exemplary embodiment of the nozzle arrangement, the at least one nozzle has outlet openings offset from one another. According to one exemplary embodiment, these are outlet openings arranged in a first row and a second row, which is angularly offset from the first row. Each of the two rows comprises at least one outlet opening. It is conceivable to offset the two rows by 90° from one another.

[0053] Such a nozzle design is particularly suitable for so-called shoulder grinding or similar grinding processes that involve corner contours. Therefore, such a nozzle can also be referred to as a shoulder nozzle. The outlets of the distribution block can be equipped with at least one straight nozzle having outlet openings arranged in a single row, with a shoulder nozzle arranged on the (right or left edge) of the distribution block, which is assigned to a shoulder on the workpiece. A shoulder nozzle is suitable for angled plunge grinding. The shoulder nozzle can have configurations regarding the first row and the second row, which include, for example, 2x3, 1x4, 4x1, 3x2 outlet openings, etc.

[0054] According to a further exemplary embodiment of the nozzle arrangement, the nozzle set has at least one first additively manufactured nozzle of a first nozzle type and at least one second additively manufactured nozzle of a second nozzle type, which differ with regard to the arrangement of their outlet openings and / or the effective flow cross-sections. As already explained above, straight nozzles and shoulder nozzles are conceivable. For both the straight nozzles and the shoulder nozzles, different flow cross-sections or opening diameters are conceivable. This can, for example, relate to opening diameters at the individual outlet openings of (effective) 1.0 mm (millimeters), 2.0 mm, 3.0 mm, and the like. There can also be variations with regard to the number of outlet openings per nozzle. Furthermore, it is conceivable to vary the shape of the outlet openings. This can include circular designs, flattened designs, oval designs, etc.

[0055] According to another exemplary embodiment of the nozzle arrangement, the coolant nozzles are made of a material that allows additive manufacturing with high surface quality, achievable without post-processing if possible. This significantly simplifies the variant creation described above, as it eliminates the need to provide a new tool for each variant.

[0056] According to another exemplary embodiment of the nozzle arrangement, the nozzles are manufactured using stereolithography, with the nozzles in particular comprising or consisting of polyacrylates, such as PMMA or PMMA-based materials, and with fluid channels in the nozzles being additively manufactured without any abrasive or smoothing post-processing. Stereolithography allows the production of delicate components with good surface quality.

[0057] According to another exemplary embodiment of the nozzle assembly, the distributor block is manufactured by selective laser sintering, wherein the distributor block comprises or consists of polyamides, in particular, and wherein fluid channels in the distributor block are additively manufactured without any subsequent machining that removes or smooths the material. Selective laser sintering allows for high production output / deposition rate, i.e., rapid production of the distributor block, which is designed significantly larger than the (individual) nozzles.

[0058] According to a further aspect, the present disclosure relates to a machine tool, in particular a grinding machine, having a nozzle arrangement according to one of the exemplary embodiments mentioned herein, wherein the nozzle arrangement has a coolant sensor, wherein the machine tool further has a coolant supply with a pump, in particular a frequency-controlled pump, or is coupled thereto, wherein the pump is connected to the inlet of the distributor block via a supply line, and wherein the machine tool further has a control device which evaluates signals from the coolant sensor and operates the coolant supply on this basis in order to discharge a desired amount of fluid.

[0059] In this way, the object of the invention is completely achieved.

[0060] The control device for the coolant supply can be part of a (global) control system of the machine tool. Alternatively, a separate control circuit can be provided for the coolant supply. A pump characteristic curve or operating parameters and characteristics of the pump are stored in the memory for the control device. The pump can be a frequency-controlled pump, for example. The machine tool can have a coolant circuit that also includes a cooling lubricant collection and recovery system. It is understood that such coolant supply systems can also be designed at a higher level and, for example, cover multiple machine tools.

[0061] An alternative embodiment involves controlling the cooling lubricant via a regulating valve. This also allows the cooling lubricant supply to be finely regulated based on the sensor signal. According to this embodiment, it is possible to use a pump that operates at a constant or essentially constant flow rate.

[0062] According to another exemplary embodiment of the machine tool, the nozzle assembly is mounted on a tool unit so that it can be moved relative to the tool unit. In a machine tool configured as a grinding machine, it is advantageous if the nozzle assembly is movable relative to the circumference of a grinding wheel. For this purpose, a drive can be provided that can move the nozzle assembly, in particular the distributor block with nozzles mounted thereon, in order to track tool wear, in particular grinding wheel wear. This ensures that an optimal coolant supply is guaranteed even when the tool is wearing down.

[0063] According to a further aspect, the present disclosure relates to a use of a nozzle set for forming a nozzle arrangement, in particular according to one of the exemplary embodiments described herein, for a machine tool for supplying cooling lubricant, wherein the nozzle set comprises at least one first additively manufactured nozzle of a first nozzle type and at least one second additively manufactured nozzle of a second nozzle type, wherein the first nozzle type and the second nozzle type differ with regard to the arrangement of their outlet openings and / or the effective flow cross sections.

[0064] In other words, a modular system or parts set can be defined that includes, for example, 5 to 15 different types of nozzles that can be combined with one another. The different nozzle types have identically designed connection pieces. This simplifies the exchange or creation of a desired nozzle arrangement based on the given modular system or parts set.

[0065] According to a further aspect of the disclosure, the object of the invention is further achieved by a digital data embodiment according to claim 15.

[0066] The digital data embodiment can relate to parts of the nozzle assembly, with the data embodiment preferably depicting the entire nozzle assembly. The digital data embodiment can be a component or basis of a program code of a file or a computer program that, when fed into and executed by a numerically controlled additive manufacturing system, enables reproduction or production of the component of multiple components of the nozzle assembly.

[0067] The CAD-based process can also be generally referred to as a numerically supported process. Common additive manufacturing processes can also be referred to as generative manufacturing processes. A colloquial term is 3D printing.

[0068] According to a further aspect of the disclosure, the object of the invention is further achieved by a data signal which is suitable for generating a representation of a data embodiment, wherein the data signal contains data which is suitable for producing a nozzle arrangement according to at least one of the aspects mentioned herein using an apparatus for additive manufacturing.

[0069] Another aspect of the disclosure relates to a method for manufacturing a nozzle assembly, comprising the following steps: Providing a digital data embodiment, in particular a CAD data embodiment, of at least one component of a nozzle arrangement, preferably of the entire nozzle arrangement, according to at least one aspect mentioned herein, and producing at least one component of the nozzle arrangement, preferably at least the distributor block or at least one nozzle, by means of a method for additive manufacturing, based on the digital data embodiment.

[0070] The provisioning step may be preceded by a step involving modeling the data embodiment. This may involve scanning or measuring a real model. Furthermore, the modeling may involve entering the relevant parameters into a CAD program.

[0071] The modeling and deployment steps can be interspersed with an upload or transfer of the data embodiment, an executable computer program, or a file in an interpreted language containing the data embodiment. This allows for a transfer from a computer workstation to a server or platform.

[0072] The step of providing the data embodiment may, for example, include making it available in a portal or database, where the portal or database is accessible via the internet or a similar channel. The data embodiment may be available for download and distributed in this way.

[0073] The manufacturing step may include converting or compiling the data embodiment into a data format that is interpretable and processable by a manufacturing facility currently in use.

[0074] Further features and advantages of the invention will become apparent from the following description and explanation of several exemplary embodiments with reference to the drawings. They show: Fig. 1 is a perspective view of a machine tool designed as a grinding machine with a housing, which is shown partially broken away; Fig. 2 is a further perspective view of a machine tool without a housing; Fig. 3 is a schematic block diagram of components of a cooling lubricant supply device for supplying cooling lubricants; Fig. 4 is a view of an outlet side of a nozzle arrangement for supplying cooling lubricants to machine tools; Fig. 5 is a frontal view of the arrangement according to Fig. 4 ; Fig. 6 is an exploded perspective view of a nozzle arrangement comprising nozzles from a nozzle set; Fig. 7 is a perspective, sectional view of a distributor block for a nozzle arrangement to illustrate a flow guide contour; Fig. 8 is a further perspective view of the design of the flow guide contour according to Fig. 7 , in a manner different from the representation according to Fig. 7 different orientation; Fig. 9 a rear perspective view of a nozzle with a connecting piece; Fig. 10 a partially sectioned view of the nozzle according to Fig. 9 to illustrate a flow guidance contour; Fig. 11 a frontal perspective view of a representation of the flow guidance contour of a shoulder nozzle; Fig. 12 an exploded side partial view of a nozzle arrangement with a nozzle that can be accommodated in a seat of a distributor module; Fig. 13 an enlarged detailed view of the representation according to Fig. 12 ; Fig. 14 a partially sectioned view of the arrangement according to Fig. 12 in the joined state; and Fig. 15 a further sectional view of the arrangement according to Fig. 12 in the joined state.

[0075] In Fig. 1 a machine tool is shown in perspective and is designated 10. Fig. 2 shows an example of a corresponding top view of the machine tool 10 according to Fig. 1 , although various components are not shown for illustrative purposes.

[0076] The machine tool 10 is designed as a grinding machine, in particular as a cylindrical grinding machine, but generally also as a horizontal grinding machine. The machine tool 10 has a machine bed 12 and a housing 14 that functions as a casing.

[0077] The enclosure 14 defines a process space that is preferably closed off from the outside or can be locked. The enclosure 14 allows for a secure demarcation of the process space of the machine tool 10, particularly during automated machining operations. In this way, the danger posed by moving components can be minimized. Furthermore, unwanted escape of lubricant, coolant, chips, or, for example, sparks into the environment can be prevented. The enclosure 14 can be suitably equipped with doors or flaps to make the process space of the machine tool 10 accessible.

[0078] In special operating modes, it may be necessary to design the viewing window as a type of protective door to allow an operator to access the interior of the machine tool from the outside. For this purpose, the viewing window can, for example, be moved or pivoted sideways to expose a previously closed opening. Operating modes that require access to the interior of the machine tool 10 can include, for example, setup operations, adjustment operations, dressing operations, or general tool or workpiece changing operations. It is understood that, depending on the degree of automation of the machine tool 10, various operating modes may require manual access to the interior of the machine tool 10.

[0079] In Fig. 1 Furthermore, a tool unit 18 with a spindle head 20 is indicated in the interior of the machine tool 10. A tool 22 is mounted on the spindle head 20. This tool 22 can be, in particular, a grinding tool, preferably a grinding wheel.

[0080] The machine tool 10 also has a workpiece holder 26 which is designed to hold a workpiece 24. For reasons of clarity, Fig. 1 No workpiece 24 is shown. The spindle head 20 can be regularly moved relative to the workpiece holder 26 in at least two spatial directions for machining a workpiece. For plunge grinding, it is sufficient if the spindle head 20 can be moved in at least one spatial direction.

[0081] Machine tools 10, in particular grinding machines, typically have an operator interface 28 arranged outside the interior of the machine tool 10. Consequently, an operator can control, program, regulate, and / or, for example, perform diagnostics on the machine tool 10 without coming into contact with the interior of the machine tool 10. The operator interface 28 is preferably an operating unit that has at least one input unit 30 for inputting control commands. The operator interface 28 can also have an output unit 32, for example a screen. Furthermore, it is conceivable to use a so-called touchscreen, i.e., a combined input and output unit.

[0082] Furthermore, in Fig. 1 A control device is indicated by 34. The control device 34 controls the machine tool 10, in particular its drives, sensors, actuators, etc. The control device 34 does not necessarily have to be (structurally) integrated into the operator interface 28. The control device 34 can be designed as a distributed control device. The machine tool 10 can also be controlled via external control devices that are connected via signal lines.

[0083] Fig. 2 shows a simplified perspective top view of a machine tool 10, which basically corresponds to the machine tool 10 according to Fig. 1 or at least be designed in a similar way. For reasons of clarity, the Fig. 2 The embodiment shown has no housing 14 and no operator interface 28.

[0084] In Fig. 2 The workpiece holder 26 is shown in simplified form. This is arranged on a workpiece headstock or workpiece carrier 38, which can be moved axially along a guide 40 via a slide. In addition, it is conceivable to provide a further workpiece carrier or tailstock 42 with a further workpiece holder 44 at an axial end of the guide 40 opposite the workpiece carrier 38, in order to rotatably fix the workpiece 24 for machining on the tool 20 between the two workpiece holders 26 and 44. The machine tool 10 according to Fig. 2 can also be called a T-slide machine. Alternatively, there are cross-slide machines, etc.

[0085] In the present case, the tool unit 18 further comprises a protective hood or tool housing 46. This tool housing 46 is arranged on the spindle head 20 and at least partially surrounds the tool 22.

[0086] The Figuren 1 and2 The illustrated machine tool 10 is exemplary for various designs of machine tools in which there is a need for a supply of cooling lubricants (KSS).

[0087] Fig. 3 shows, using a schematic block diagram, a cooling lubricant supply device or cooling lubricant supply device (cooling lubricant supply device), designated overall by 50. The cooling lubricant supply device 50 has a nozzle arrangement 52, which has a distributor block 54 and at least one nozzle 56. The nozzle 56 is directed with its outlet opening towards an intermediate space between the tool 22 and the workpiece 24. Cooling lubricants are introduced from the cooling lubricant supply device 50 through the nozzle 56 into the area in which machining takes place. In this way, excess heat can be dissipated. Furthermore, chips or tool wear can be removed. In addition, the supply of cooling lubricants can be used to bring about favorable friction conditions between the tool 22 and the workpiece 24.

[0088] The nozzle assembly 52 further includes a coolant sensor 58, which is flanged to the distributor block 54. The sensor 58 can be, for example, a pressure sensor, such as a back pressure sensor. In general, the sensor 58 can also be designed as a flow sensor. The sensor 58 is mounted on a sensor receptacle of the distributor block 54.

[0089] The sensor 58 is connected to a coolant control system 64 via a control line 62. The coolant control system 64 can be implemented as a component of the (higher-level) control device 34 of the machine tool 10 or as a separate unit. The coolant control system is connected to a pump 68 for pressure generation via a control line 66. The pump 68 is preferably a controllable pump. Thus, the coolant control system 64 can control the pump 68 depending on the signal transmitted by the sensor 58. The pump 68 is connected to an inlet on the distributor block 54 via a line 70. Furthermore, the pump 68 is connected to a reservoir 72 via a line designated 74.

[0090] It is understood that the cooling lubricant supply system 50 may also include measures for collecting, cleaning, and recycling cooling lubricants. Accordingly, a cooling lubricant circuit may also be provided.

[0091] The nozzle assembly 52 is mounted on a nozzle feed unit 80. The nozzle feed unit 80 comprises a carrier 82 that supports the nozzle assembly 52, in particular the distributor block 54. The carrier 82 is mounted on a guide 84, in particular a longitudinal guide. The guide 84 is mounted, for example, on the tool housing 46 or otherwise on the spindle head 20. The nozzle feed unit 80 has a drive 86 for moving the carrier 82 and thus the nozzle assembly 52 back and forth in a direction designated by 88. In this way, the nozzle assembly 52 can be suitably adjusted if wear or a reduction in diameter occurs on the tool 22.

[0092] Fig. 4 und Fig. 5 show a front view and a corresponding side view of an embodiment of a nozzle arrangement 52 for use in a cooling lubricant supply device 50 in a machine tool 10. In addition, Fig. 6 an exploded view of the components of a nozzle assembly 52.

[0093] The nozzle assembly 52 is provided with a distributor block 54. A housing of the distributor block 54 is in Fig. 5 designated 90. Preferably, at least the housing 90 of the distribution block 54 is manufactured integrally and additively. The distribution block 54 has an inlet 92 for a supply line (compare line 70 in Fig. 3 ) and a connection 94 for a coolant sensor 58. Furthermore, the distributor block 54 has several outlets 96, 98, 100, 102; for this purpose, reference is made to the exploded view of an embodiment of the nozzle arrangement 52 in Fig. 6 referred to.

[0094] In Fig. 6 Further, 106 indicates a nozzle set comprising nozzles 108, 110, 112, 114 of various nozzle types. The nozzles 108, 110, 112, 114 can be accommodated at the outlets 96, 98, 100, 102 of the distribution block 54. It is understood that the nozzle set 106 can include other types and corresponding quantities of nozzles to create various configurations of the nozzle arrangement 52.

[0095] The nozzle assembly 52 also includes blind plugs 116, which can be used to seal the outlets 96, 98, 100, 102 of the distribution block 54 as needed. Thus, the outlets 96, 98, 100, 102 can be selectively deactivated.

[0096] The frontal view of the nozzle arrangement 52 in Fig. 4 shows that two blind plugs 116 as well as a first nozzle 108 and a further nozzle 112 are accommodated at the outlets 96, 98, 100, 102 of the distributor block 54. Thus, Fig. 4 an exemplary configuration of the nozzle arrangement 52, which uses the nozzle set 106 ( Fig. 6 ) can be generated.

[0097] The Fig. 6 Nozzles marked 108, 110 can also be called straight nozzles. Fig. 6 Nozzles designated 112, 114 can also be referred to as shoulder nozzles. The shoulder nozzles 112, 114 each have two rows of outlet openings that are offset (angularly) from one another. The shoulder nozzles 112, 114 are suitable, for example, for machining so-called shoulder contours on workpieces. The straight nozzles 108, 110 each have a (single) row of outlet openings. For example, the nozzles 108, 110 differ from one another in terms of their effective flow cross-sections at the outlet openings.

[0098] The Fig. 6 The nozzles 108, 110, 112, 114 shown represent a defined variety of variants of the nozzle set that can be used to form the nozzle arrangement 52.

[0099] The nozzles 108, 110, 112, 114 and the blind plug 116 can be received in or inserted into a seat 120 of the respective outlet 96, 98, 100, 102. For this purpose, the nozzles 108, 110, 112, 114 and the blind plug 116 each have a connecting piece 122 that is adapted to the receiving seat or seat 120.

[0100] The position of the nozzles 108, 110, 112, 114 or the blind plug 116 on the distributor block 54 is secured by so-called safety slides 124. The safety slides 124 have a forked contour 126 and a grip 128. The forked contour 126 is designed to positively engage the nozzles 108, 110, 112, 114 or the blind plug 116 in the area of ​​the connecting piece 122 in the assembled state in order to prevent them from becoming detached from the distributor block 54. According to the Fig. 6 In the embodiment shown, the safety slide 124 can be rotated by 180° so that the handle 128 faces the distributor block 54 and faces away from it.

[0101] A guide slot 130 is formed on the distributor block 54, through which the safety slides 124 can be fed to a seat 120 of the outlets 96, 98, 100, 102. The safety slides 124 are each fed radially, relative to a longitudinal extension of the seat 120 or the connecting piece 122. In Fig. 6 Furthermore, 132 designates a receiving seat for the locking slide 124 in the respective seat. The receiving seat 132 is a lateral recess in the peripheral wall of the corresponding seat 120. Thus, the locking slide 124, with its forked contour 126, can simultaneously retract into corresponding recesses on the seat 120 and on the connecting piece 122 to achieve the desired axial positional locking.

[0102] With reference to Fig. 7 as well as Fig. 8 An exemplary design of the distributor block 54 is illustrated in more detail. The distributor block 54 has an internal flow guidance contour 138. Fig. 7 illustrates the flow guidance contour 138 using a section through the distributor block 54. Fig. 8 illustrates surfaces that form the flow guidance contour 138.

[0103] The representations according to Fig. 7 und Fig. 8 show the input 92, the connection 94 and the outputs 96, 98, 100,102. Furthermore, the illustration in Fig. 7 the receiving seat 132 in the seat 120 of the respective output 96, 98, 100, 102. Fig. 8 illustrates a branch 140 of the flow path. Furthermore, Fig. 8 the position and design of flow channels 142, 144, 146, 148, which extend between the inlet 92 and the outlets 96, 98, 100, 102. A connecting channel 150 extends between the inlet 92 and the connection 94 for the coolant sensor 58.

[0104] Fig. 7 und Fig. 8 clearly show that the flow guidance contour 138 comprises curved flow paths and aerodynamically designed transitions / deflections. The flow guidance contour 138 cannot be manufactured at a reasonable cost using conventional abrasive manufacturing processes. Furthermore, in particular Fig. 8 that the housing 90 of the distribution block 54 is designed integrally and in one piece and thereby integrates a multitude of functions or functional elements.

[0105] Similarly, Fig. 9 und Fig. 10 An exemplary embodiment of a nozzle, designated 108, of nozzle set 106. Nozzle 108 is designed as a straight nozzle. Nozzle 108 has a housing 154. Housing 154 is integral and constructed in one piece. Housing 154 provides a plurality of functions or functional elements.

[0106] This includes, for example, a stop plate 156 and a position securing element 158, which faces the connecting piece 122. The stop plate 156 defines an axial position of the nozzle 108 in the mounted state on the seat 120. The position securing element 158 ​​defines a rotational position of the nozzle 108 in the mounted state on the seat 120, compare the receptacle 160 in Fig. 6 as well as in Fig. 12 , which forms the counterpart.

[0107] The nozzle 108 further comprises an inlet 162 and a plurality of outlets 164. In other words, the nozzle 108 is fanned out. The outlets 164 are arranged in the Figuren 9 und 10 The illustrated embodiment of the nozzle 108 is arranged in a row next to one another. In the exemplary embodiment, five outlets 164 are positioned next to one another.

[0108] A flow guide contour 168 extends in the housing 154, compare in particular Fig. 10 . The flow guide contour 168 comprises a branch 170 between the one inlet 162 and the plurality of outlets 164. The branch 170 forms a flow channel 172 for each of the outlets 164. The cooling lubricants can exit the nozzle 108 through the outlets 164. Furthermore, the exemplary illustration in Fig. 10 a centrally arranged web 174. The web 174 can serve, on the one hand, to guide the flow and, on the other hand, to increase the stability of the housing 154.

[0109] The flow guidance contour 168 in the housing 154 is designed for optimal flow. The position, shape, and orientation of the flow channels 172 of the flow guidance contour 168 cannot be manufactured at a reasonable cost using conventional abrasive manufacturing processes. Instead, it is proposed to manufacture the housing 154 of the nozzle 108 additively. One suitable manufacturing process is, for example, stereolithography, in which polymethyl methacrylate (PMMA) or similar materials are processed. An advantage of this combination of material and manufacturing process is the good surface quality. Therefore, flow losses along the flow guidance contour 168 of the nozzle 108 can be minimized. The cooling lubricants can exit from openings at the outlets 164 in the desired quantity and at the desired speed. This allows for highly precise and efficient beam guidance.

[0110] In addition to the representations according to Fig. 9 und Fig. 10 illustrated Fig. 11 a flow guide contour 178, which, for example, corresponds to the shoulder nozzle 114 in Fig. 6 The flow guidance contour 178 extends between an inlet 180 and between a first outlet 182 and second outlets 184. In the initial example according to Fig. 11 only a single first output 182 is provided. However, two or three such outputs 182 may also be provided. Alternatively, the number of outputs 184 may be different from that shown in Fig. 11 The number shown (four) may vary and may, in particular, be three, two, or one. Other combinations are conceivable. Outlets 182 form a first row. Outlets 184 form a second row. The rows are offset by approximately 90° from each other. In this way, nozzle 114 is suitable for supplying coolant during shoulder grinding.

[0111] The flow guide contour 178 comprises a branch 186 between the first outlets 182 and the second outlets 184. The first outlets 182 are assigned first flow channels 188 (in Fig. 11 only a single flow channel 188). The second outlets 184 are assigned second flow channels 190 (in Fig. 11 four flow channels 190). The design in Fig. 11 cannot be manufactured at a reasonable cost using conventional abrasive manufacturing processes. The flow guidance contour 178 is therefore created using an additive manufacturing process, such as stereolithography, using polymethyl methacrylate (PMMA) or similar materials. The flow guidance contour 178 allows for a streamlined design and supply of cooling lubricants for shoulder grinding and similar machining processes with just one nozzle 114.

[0112] It is understood that all of the nozzles 108, 110, 112, and 114 can be considered as a starting point for deriving further variants. This concerns, for example, the number and position of the respective outlets as well as the resulting effective flow cross-sections for the cooling lubricants. Since the nozzles 108, 110, 112, and 114 are manufactured using additive processes, no further effort (e.g., for mold production) is required to develop further variants, apart from the design effort. It is proposed to provide and maintain a certain variety of nozzle variants, on the basis of which nozzle arrangements can be assembled for a multitude of applications.

[0113] With reference to the Figuren 12 bis 15 The assembly and assembled state of a nozzle 108 on a seat 120 at an outlet 96 of the distribution block 54 are explained in more detail. The nozzle 108 is shown as a representative of other nozzle types and the blind plug 116.

[0114] Fig. 12 shows a state immediately prior to assembly. The nozzle 108 is already aligned with its connecting piece 122 and the seat 120 on the distributor block 54. Furthermore, the safety slide 124 is aligned with the guide slot 130, which merges into the receiving seat 132. The nozzle 108 with the connecting piece 122 can be inserted axially into the seat 120. The safety slide 124 can be inserted radially with respect to the seat 120 and the connecting piece 122.

[0115] Fig. 13 shows an enlarged partial view of the nozzle 108 in the area of ​​the connecting piece 122. The connecting piece 122 extends from the stop plate 156. Furthermore, the position securing element 158 ​​is arranged on the stop plate 156, which in the joined state fits into the receptacle 160 ( Fig. 12 ) indented.

[0116] An insertion aid 194 in the form of a bevel or curve is provided on the seat 120. Alternatively or additionally, an insertion aid can also be provided on the connecting piece 122.

[0117] A radially effective sealing ring 196 and an axially effective sealing ring 198 are located on the connecting piece 122. The sealing ring 196 is located in a circumferential area of ​​the connecting piece 122. The sealing ring 198 is located on a frontal end face of the connecting piece 122 in the direction of the seat 120.

[0118] Fig. 13 illustrated the position of a receiving groove 200 for the sealing ring 196 using an enlarged view. Fig. 15 shows in the sectional view a receptacle 202 for the sealing ring 198. On the connecting piece 122, a groove 204 for the safety slide is also formed, compare Fig. 12 The seat 120 provides a cylindrical surface 206 into which the connecting piece 122 can be at least partially inserted. Furthermore, an axial stop 208 formed by an end face is provided on the side of the distributor block 54. The stop 208 can contact the stop plate 156 of the nozzle 108 and thus provide an axial stop for the nozzle 108 on or in the seat 120.

[0119] In Fig. 13 210 indicates an eccentricity between the receiving groove 200 for the sealing ring 196 and a longitudinal axis through the connecting piece 122. The longitudinal axis of the connecting piece 122 and a corresponding longitudinal axis through the seat 120 are in the joined state (compare Fig. 14 und Fig. 15 ) are aligned. The receiving groove 200 is slightly eccentric to this. This causes a radially effective force in the assembled state, compare arrow 212 in Fig. 15 In this way, a defined alignment and orientation of the nozzle 108 or all nozzles at the respective seat 120 is achieved. Furthermore, the force 212 can push the position-locking element 158 ​​even further into the respective receptacle 160.

[0120] Furthermore, Fig. 15 An arrow marked 214 indicates an axially effective force. This force is generated by the interaction of the safety slide 124 and the corresponding receiving groove 204. The receiving groove 204 is designed in such a way that the safety slide 124 in the joined state (see Fig. 14 und Fig. 15 ) creates a preload on a flank of the receiving groove 204, which urges the axially effective sealing ring 198 in the direction of an inner axial stop 216 on the seat 120.

Claims

1. A modular nozzle arrangement (52) for coolant lubricants (KSS), comprising: a distributor block (54) providing an inlet (92) and a plurality of outlets (96, 98, 100, 102) for a KSS fluid, and at least one KSS nozzle (56; 108, 110, 112, 114) receivable at an outlet (96, 98, 100, 102), and being selectable from a nozzle set (106), wherein at least the at least one nozzle (56; 108, 110, 112, 114) is additively manufactured, wherein the outlets (96, 98, 100, 102) each have a seat (120) to accommodate a connector piece (122) of the nozzle (56; 108, 110, 112, 114), characterized in that: the at least one nozzle has an internal flow-guiding contour (138, 168, 178) with curved flow channels (142, 144, 146, 148; 172; 188, 190), in the coupled state, a first seal (196) and a second seal (198) are provided between the seat (120) and the connector piece (122), the first seal (196) is arranged as a radially effective seal, and the second seal (198) as an axially effective seal, and a groove (204) interacting with a locking slider (124), particularly an encircling groove, is formed on the connector piece (122).

2. The nozzle arrangement (52) according to claim 1, wherein both the distributor block (54) and the at least one nozzle (56; 108, 110, 112, 114) are additively manufactured and have an internal flow-guiding contour (138, 168, 178) with curved flow channels (142, 144, 146, 148; 172; 188, 190).

3. The nozzle arrangement (52) according to claim 1 or 2, comprising a plurality of nozzles (56; 108, 110, 112, 114), each coupled with an outlet (96, 98, 100, 102).

4. The nozzle arrangement (52) according to any one of claims 1 to 3, wherein the at least one nozzle (56; 108, 110, 112, 114) has an abutment plate (156), with the connector piece (122) extending from the abutment plate (156), and wherein a position-locking element (158) is arranged on the abutment plate (156), engaging in a recess (160) on the seat (120) when assembled and defining the rotational position of the nozzle (56; 108, 110, 112, 114) on the seat (120) in the mounted state.

5. The nozzle arrangement (52) according to any one of claims 1 to 4, wherein the connector piece (122) carries the first seal (196), which is arranged in a receiving groove (200), and wherein the receiving groove (200) is preferably at least slightly offset or eccentric relative to the longitudinal axis of the connector piece (122).

6. The nozzle arrangement (52) according to any one of claims 1 to 5, wherein the first seal (196) and the second seal (198) are ring seals.

7. The nozzle arrangement (52) according to any one of claims 1 to 6, wherein in the assembled state, the locking slider (124) axially presses the nozzle (56; 108, 110, 112, 114) into the seat (120).

8. The nozzle arrangement (52) according to any one of claims 1 to 7, wherein outlets (96, 98, 100, 102) that are not coupled with a nozzle (56; 108, 110, 112, 114) are each closed with a blind plug (116).

9. The nozzle arrangement (52) according to any one of claims 1 to 8, wherein at least one installed nozzle (56; 108, 110, 112, 114) has a fanned fluid path, and / or wherein the at least one nozzle (56; 108, 110, 112, 114) has a branching (170, 186) defining a plurality of outlet openings.

10. The nozzle arrangement (52) according to any one of claims 1 to 9, wherein the at least one nozzle (56; 108, 110, 112, 114) has outlet openings (182, 184) that are arranged offset from one another, and that are arranged in a first row and a second row, the second row being angularly offset from the first one.

11. The nozzle arrangement (52) according to any one of claims 1 to 10, wherein the nozzles (56; 108, 110, 112, 114) are manufactured using stereolithography, with fluid channels in the nozzles (56; 108, 110, 112, 114) additively manufactured without subtractive or smoothening post-processing, and wherein the nozzles (56; 108, 110, 112, 114) particularly comprise or consist of polyacrylates.

12. The nozzle arrangement (52) according to any one of claims 1 to 11, wherein the distributor block (54) is manufactured using selective laser sintering, with fluid channels in the distributor block (54) additively manufactured without subtractive or smoothening post-processing, and wherein the distributor block (54) particularly comprises or consists of polyamides.

13. A machine tool (10), particularly a grinding machine, with a nozzle arrangement (52) according to any one of claims 1 to 12, wherein the nozzle arrangement (52) includes a KSS sensor (58), the machine tool further comprising or being coupled with a KSS supply system (50) including a pump (68), particularly a frequency-controlled pump, the pump (68) being connected via a supply line (70) to the inlet (92) of the distributor block (54), the machine tool further comprising a control device (34, 64) evaluating signals from the KSS sensor (58) and operating the KSS supply system (50) accordingly to deliver a desired fluid amount, and wherein the nozzle arrangement (52) is mounted to a tool unit (18) and movable relative to the tool unit (18), particularly relative to the circumference of a grinding wheel (22).

14. A use of a nozzle set (106) to form a nozzle arrangement (52) according to any one of claims 1 to 12 for a machine tool (10) according to claim 13, wherein the nozzle set (106) comprises: - at least one first additively manufactured nozzle (56; 108, 110, 112, 114) of a first nozzle type, and - at least one second additively manufactured nozzle (56; 108, 110, 112, 114) of a second nozzle type, wherein the first nozzle type and the second nozzle type differ at least in terms of the arrangement of their outlet openings or their effective flow cross-sections.

15. A digital data representation, particularly a CAD data representation, of at least one nozzle (56; 108, 110, 112, 114) for a nozzle arrangement (52) according to any one of claims 1 to 12, the data representation being suitable for manufacturing at least one KSS nozzle (56; 108, 110, 112, 114) for the nozzle arrangement (52) based on the data representation and using an additive process.