Lathe tool holder, lathe tool, lathe, and turning method using same

Abstract

The invention relates to a lathe tool holder (1) having a main body (2) which has a stop face (21) for mounting on a lathe (100) and forms a tool receiving space (22) for receiving a cutting element (50), wherein a coolant channel (3) is formed in the main body (2), which coolant channel has an inlet (31) and at least one outlet (32), and wherein the inlet (31) lies in the region of the stop surface (21). The invention further relates to a lathe tool (60) provided therewith, a lathe (100) provided therewith and to a turning method.

Description

[0001] January 29, 2025

[0002] 80095-0160- PWO - Kr / Kr

[0003] Applicant: OptoTech Optikmaschinen GmbH

[0004] Löbstedter Straße 74

[0005] 07745 Jena

[0006] Germany

[0007] Tool holder, turning tool, lathe and turning process herewith

[0008] The invention relates to a rotary tool holder according to claim 1, a rotary tool hereto according to claim 17, a lathe hereto according to claim 21, and a turning method according to claim 30.

[0009] When machining workpieces with optical properties, such as glass or plastic lenses, waveguides, metal optical mirror surfaces, etc., lathes with fast-tool drive units are used. These enable very fast infeed movements of the turning tool, especially for turning non-circular surfaces, where the turning tool is moved towards and away from the workpiece depending on its rotational angle.

[0010] For example, when processing spectacle lenses made of glass or plastic (such as polycarbonate, CR 39, HL-Index, etc.), a lens blank is used, which has a front and a back surface. The front and back surfaces usually already have an initial curvature. This initial curvature can be convex or concave. It can also have, for example, a spherical or progressive shape. The lens blanks are usually round. The front or back surface is shaped by removing material to create a prescription surface, which, depending on the desired optical effect for correcting a refractive error, can have a spherical, aspherical, toric, atoric, progressive, or freeform geometry (progressive surface).

[0011] A typical work sequence involves mounting the lens blank onto a block, optionally pre-milling the surface opposite the block (i.e., the front or back), and a turning process to produce the optically active shape. The turning is usually followed by a fine grinding or polishing process to achieve the necessary surface finish.

[0012] For the turning process, lathes with linear drives are used, particularly those with a fast-tool drive unit. These fast-tool drive units are characterized by high linear oscillation speeds, for which moving coils, piezoelectric drives, and fast-tool servos are used as actuators. The fast-acting linear drive enables the turning of non-rotationally symmetrical surfaces by performing infeed movements of the turning tool depending on the rotation angle of the lens blank. The linear drive moves the cutting edge of the turning tool in a highly dynamic linear oscillation. Preferably, the machining process is carried out with the supply of a coolant, particularly a cooling lubricant, in liquid form or partially as an aerosol into the cutting area to cool the lens blank and the cutting edge.Material changes in the lens blank caused by heat and cutting edge wear are reduced, the surface finish of the cut is improved, and chip removal is partially facilitated. Fine, respirable particles are also bound by the coolant.

[0013] Typically, flexible or bendable lines are used to supply the coolant; these are aligned with the cutting zone by bending them with a nozzle end or nozzle piece and are stationary relative to the housing of the linear drive.

[0014] The disadvantage here is the long distance between the nozzle end and the cutting zone, which causes the coolant jet to atomize and be enriched by air, which

[0015] The cooling effect is significantly less efficient than that of the coolant. Furthermore, the widening of the coolant jet considerably reduces the velocity of the coolant. Another disadvantage is that the cutting edge, driven by the linear actuator, oscillates highly dynamically over a total stroke of, for example, up to 45 mm, at frequencies of up to 600 Hz or more. The narrower the coolant jet, the less the cutting area is supplied with coolant during the oscillation. The slow, air-enriched coolant jet, due to the high rotational speed of the lens blank, can only partially overcome the air cushion around the lens and is also immediately flung back out. Additionally, with extreme geometries, the rotating workpiece can cause the coolant jet to be obscured. Finally, the coolant jet or the nozzle tip must be manually readjusted each time, depending on the lens blank and turning tool used.Due to the remote, stationary arrangement, the coolant jet cannot be optimally aligned with the point that arises between the lens surface and the cutting edge in each individually manufactured lens.

[0016] Another solution for supplying the cutting area with cooling lubricant is from

[0017] EP 2813305 B1 proposes a lathe with a linear drive, which has a first connection for a coolant source that is fixed relative to a housing of the linear drive, and a coolant outlet fluidly connected to the first connection for delivering a coolant jet to the turning tool. The turning tool is held by a tool holder, which in turn is fixed to a mounting surface on a mounting plate of the linear drive. The mounting plate is driven by the linear drive in an oscillating manner, and thus also the mounted tool holder and the turning tool. It is proposed that the coolant outlet is formed by at least one nozzle channel in the tool holder, the nozzle channel communicating with a distribution bore in the tool holder.A second connection, projecting into the working area in front of the mounting plate, is attached to the distribution bore of the tool holder mounted on the mounting plate, spaced apart from the mounting surface. An elastic hose connects the first connection to the second connection, is longer than the greatest clear distance between the first and second connections, and runs between the connections in a C- or U-shape through the working area in front of the mounting plate.

[0018] The disadvantage of this design is that shavings get caught in the flexible hose and the connections in the work area, as these are routed through the lathe's work area without any protection. Consequently, the work area is difficult to clean.

[0019] Furthermore, the chips can damage the hose, or long chips can become trapped and experience tensile forces that reduce the surface quality of the chip removal.

[0020] The object of the invention is therefore to overcome the disadvantages of the prior art and to provide the simplest, most reliable, easy-to-clean, and low-maintenance method possible for supplying coolant to the cutting edge of a rotary tool driven in an oscillating motion by a linear drive. The coolant should be precisely directed to the cutting point, so that a small and efficient coolant flow rate is sufficient for cooling, lubrication, and chip removal. Readjusting the direction of the coolant jet should be avoided as much as possible.

[0021] Features of the invention are specified in claim 1, as well as in claims 17, 21 and 30. Embodiments are the subject of claims 2 to 16, 18 to 20 and 22 to 29.

[0022] The invention relates to a rotary tool holder with a base body which has a stop surface for mounting on a lathe and forms a tool mounting position for receiving a cutting element, wherein a coolant channel is formed in the base body which has an inlet and (exactly one or) at least one outlet, and wherein the inlet is located in the area of ​​the stop surface.

[0023] The advantage of this design is that the toolholder's coolant channel can be supplied from the rear via the stop surface. This eliminates the need for connections or hoses within the lathe's work area. Instead, the coolant supply can be provided directly from the outside of the work area, with the toolholder mounted exposed to the wet-side interior of the work area, but without any coolant lines. This simplifies cleaning the work area, reduces chip accumulation, and allows for a shorter and therefore lighter toolholder design. Furthermore, the absence of connections or hoses within the work area obstructs the movement between the turning tool and the workpiece, enabling particularly deep penetration into highly concave geometries. This results in high efficiency and surface quality with extended tool life. The coolant can be liquid, gaseous, aerosolized, or a cutting lubricant.Preferably, the contact surface is designed to be flat, i.e., as a flat surface.

[0024] The outlet, if it opens into the working area, can always be directly aligned with the machining point by moving along with the tool holder, ideally meeting between the cutting edge and the lifted chip. This results in efficient and reliable cooling that is hardly obstructed by the workpiece. Furthermore, this allows the chip to be deflected directly in a defined direction. This leads to fewer machine defects due to reduced contamination in the form of chip nests or localized contamination. A preferred embodiment also contributes to this, in which the outlet is located in the area of ​​the stop surface such that a concealed channel connection can be formed in the area of ​​the stop surface when the base body is mounted on a lathe mounting surface. Optionally, the outlet can be surrounded by the stop surface.

[0025] According to a more detailed embodiment, the inlet has sealing surfaces that are surrounded by the stop surface or parts thereof. This ensures a fluid-tight connection. Sealing surfaces also include those that form a sealing seat, e.g., for a sealing ring.

[0026] Specifically, the sealing surfaces of the connection can be part of a coupling geometry. A coupling geometry creates a positive-locking connection, ensuring the sealing surfaces are correctly positioned relative to each other. Optionally, the base body itself can form a plug-in coupling geometry, such as a cylindrical hole or a pin. Alternatively, a mounting hole can be formed in the base body into which an additional coupling piece is inserted, for example, screwed or pressed in, forming a coupling pin or a coupling jaw.

[0027] In an optional further development, at least one outlet is located either (a) in the area of ​​the tool holding position, in particular such that an exit jet is directed towards a cutting edge of a cutting element that is mounted on the tool holding position and attached to the base body; or (b) in the area of ​​the stop surface, in particular such that when mounting the base body on a mounting surface of a lathe, a concealed channel connection can be formed in the area of ​​the stop surface.

[0028] In variant a), an outlet into the vicinity of the base body should be provided. The coolant channel then allows for cooling of the base body, which consequently experiences less thermal expansion, thus increasing turning precision, and direct cooling of the cutting edge of the cutting tool and the chip. Due to the coolant outlet from the base body, there is a short distance to a cutting element on the mounting surface, so that turbulence and turbulent coolant flows are avoided and the coolant can be guided to the point of action in a largely laminar manner. A suitable nozzle geometry at the outlet can also increase the exit velocity and pressure of the coolant. This efficiently overcomes any air cushion around the rotating workpiece. Optionally, a nozzle element can be arranged in or at the outlet, preferably in a replaceable manner.This allows the nozzle piece to be replaced in case of damage or deposits / blockage, or optionally replaced with a differently geometrically designed nozzle piece with a different coolant jet characteristic.

[0029] In variant b), a closed cooling channel loop is formed through the base body. This design achieves particularly efficient cooling of the base body, as high coolant flow rates with minimal pressure drop are possible. The coolant channel can be designed with relatively low resistance for the coolant flow. At the outlet, a narrower nozzle channel is typically required, enabling a powerful yet controlled jet at high pressure. The outlet preferably features sealing surfaces surrounded by the stop surface or parts thereof. This allows for a tight seal when the base body is mounted on a mounting surface. The sealing surfaces of the outlet can also be part of a coupling geometry.

[0030] Preferably, a section of the coolant channel, and in particular the optional coolant channel loop, runs below the tool holder. This cools the tool holder and the cutting tool from the inside. Optionally, the coolant channel can be designed to be open towards the tool holder, so that the cutting tool forms portions of the coolant channel walls. This cools the cutting tool directly from below.

[0031] In a more detailed embodiment, the coolant channel has exactly one or at least two outlets located in the area of ​​the tool holder, in particular such that their respective exit jets are directed towards a cutting edge of a cutting element that is mounted on the tool holder and attached to the base body. This allows, for example, the cutting edge to be sprayed with coolant at two points, ensuring optimal cooling of the cutting zone even with different cutting directions or when shadowing is caused by a chip. Optionally, the respective exit jets can be directed towards each other, in particular to have a common intersection point.

[0032] Furthermore, the coolant channel upstream of the at least one outlet can have a smaller cross-section than in the inlet area. This reduces the pressure loss along the coolant channel and simultaneously allows for a high flow velocity at the outlet. Preferably, the cross-section of the at least one outlet is at most half, and preferably one-third, the size of the cross-section of the inlet.

[0033] Optionally, the coolant channel splits into at least two outlets starting from the inlet. The total cross-sectional area of ​​the coolant channel before the outlets should be smaller than in the inlet area. In particular, the combined cross-sectional area of ​​the outlets should be at most half, preferably one-third, the cross-sectional area of ​​the inlet.

[0034] According to an optional further development, the coolant channel is designed to run substantially below the tool holder in front of at least one outlet, preferably at least substantially parallel (+ / - 15 degrees) to a support surface of the tool holder. This enables direct cooling below the cutting tool, from which heat can be efficiently dissipated to the base body.

[0035] Preferably, the base body is monolithic or permanently assembled from several individual parts. This results in a robust tool holder. The coolant channel can be created, for example, by drilling holes in the base body or by 3D printing the base body. Preferably, the base body is made of metal.

[0036] Another possible design involves positioning the tool holder at a distance from the stop surface. This allows the cutting tool to be held at a distance from the stop surface.

[0037] Preferably, the tool holder and the stop surface are arranged at opposite ends of the base body. This allows the tool holder to plunge deep into an internal contour to be machined.

[0038] For the same reason, it is preferred that the base body should taper from the stop surface towards the tool holder. This allows for a reduction in the weight of the base body.

[0039] Furthermore, the mounting surface should be equipped with fastening geometries for attaching the base body to a lathe, in particular, for example, one or more pin holes, one or more screw holes, one or more guide edges, and / or other positive-locking contours. This enables a mechanical connection of the turning tool holder to a mounting surface. According to a more detailed embodiment, the tool mounting position has fastening geometries for attaching a cutting element, in particular a cutting insert. This allows the cutting element to be positively fixed, either directly or indirectly, with a fastening device, e.g., a fastening screw.

[0040] Specifically, the mounting geometries can include a countersink and / or a screw hole, particularly a threaded hole. A countersink forms a recess into which the cutting element can fit snugly. A screw hole allows the cutting element to be fastened.

[0041] In alternative versions, the cutting element is fixed to the mounting surface by means of a material bond, e.g. by being blocked, glued or welded on.

[0042] The invention further relates to a turning tool with a turning tool holder as described above and below, and a cutting element with a cutting edge, which is mounted on the tool holder and attached to the base body. The advantages correspond to those of the turning tool holder according to the invention.

[0043] Preferably, the cutting element with its cutting edge extends beyond the base body. This enables the machining of concave countersinks.

[0044] A preferred design involves orienting the cutting edge of the cutting element so that it points past the base body at a distance. This causes the cutting forces to push the cutting element away from the base body, resulting in lifting forces acting on the cutting element during cutting, rather than the cutting element being pressed against the mounting surface. This allows the nozzle to be positioned very close to the cutting edge. Rapid movements of the tool holder then deflect the exit jet less, and it reaches the cutting edge precisely.

[0045] In particular, the cutting edge of the cutting element should point past the at least one outlet, especially such that an exit jet from the at least one outlet intersects the cutting edge. This also results in a particularly short distance between the outlet and the cutting edge, so that the jet hits the cutting edge precisely despite rapid movements and can hardly be shadowed or interrupted by manufacturing geometries. The cutting edge of the cutting element is preferably a defined cutting edge and preferably consists of natural diamond or synthetic diamond material, in particular polycrystalline diamond [PCD].

[0046] Finally, the invention relates to a lathe with a rotary tool actuator and with a rotary tool holder as described above and below, or a rotary tool as described above and below, wherein the rotary tool actuator has a receiving surface against which the stop surface of the base body of the rotary tool holder rests, wherein a connection opening is formed in the area of ​​the receiving surface which is fluid-tightly connected to the opening of the coolant channel of the base body. The advantages correspond to those of the rotary tool holder according to the invention.

[0047] The mounting surface can be flat, i.e., specifically a planar surface. Optionally, one or more guide pins can be arranged in the area of ​​the mounting surface such that they each position the rotary tool holder relative to the mounting surface of the rotary tool actuator. For this purpose, the guide pin(s) can be formed integrally with one part of the rotary tool holder and the mounting surface of the rotary tool actuator, and project into a pin hole on the other part of the rotary tool holder and the mounting surface of the rotary tool actuator. Alternatively, the guide pin(s) can be formed separately and each project into a pin hole in the rotary tool holder and the mounting surface of the rotary tool actuator.

[0048] Furthermore, one or more screw holes can be formed in the area of ​​the receiving surface and the rotary tool holder can be attached to the receiving surface of the rotary tool actuator with fastening screws protruding into these screw holes.

[0049] Optionally, one or more guide edges and / or other positive locking contours can be formed in the area of ​​the receiving surface of the rotary tool actuator, which correspond to guide edges and / or other positive locking contours of the rotary tool holder.

[0050] Preferably, the rotary tool actuator is a linear drive, and the mounting surface is formed on a mounting plate of the linear drive. With such a linear drive, whose direction of movement is preferably orthogonal to the mounting plate, the feed depth of the rotary tool holder can be varied. A linear drive from the group consisting of moving-coil actuators, piezoelectric drives, and fast-tool servos is particularly preferred. This enables very fast oscillating movements. The advantages of the coolant channel in the rotary tool holder are thus particularly evident. The mounting plate can be designed as a distribution plate with internal distribution channels for coolant. Optionally, the distribution plate is a 3D-printed component. The mounting plate preferably has a honeycomb structure, especially with honeycomb-shaped cavities. This makes it particularly lightweight, rigid, and suitable for high accelerations of the linear drive.Preferably, a coolant line is connected to the back of the mounting plate and linked to the connection opening.

[0051] According to a more detailed embodiment, the lathe has a workpiece spindle with a workpiece holder that rotates about a rotary axis and is designed to hold a workpiece, in particular a lens blank. This allows optical lenses to be machined by turning, preferably with non-circular surfaces, such as those required for spectacle lenses. The workpiece holder should be positioned opposite the turning tool holder, at least during the machining of the workpiece.

[0052] Specifically, the connection opening should be positioned within the area of ​​the mounting surface in such a way that mounting the base body on the mounting surface creates a concealed channel connection in the area of ​​the stop surface. This eliminates the need for any obstructive structures for coolant supply within the lathe's working area. The connection opening can be surrounded by the mounting surface and / or the stop surface.

[0053] Optionally, the connection opening has sealing surfaces that are surrounded by the receiving surface or parts thereof. This allows for a tight connection to the coolant channel of the base body. It is preferable that the sealing surfaces of the connection opening form part of a coupling geometry. This allows for a positive-locking connection of the coolant channel of the base body.

[0054] Optionally, a second connection opening can be provided in the area of ​​the receiving surface, with at least one outlet located in the area of ​​the stop surface such that mounting the base body on the receiving surface creates a concealed channel connection to the second connection opening in the area of ​​the stop surface. This allows a coolant loop within the base body to be supplied with coolant without requiring lines in the lathe's working area. Specifically, the coolant channel can form a closed cooling loop through the base body. The second connection opening can have sealing surfaces that are surrounded by the stop surface or parts thereof and / or the receiving surface. These sealing surfaces of the second connection opening can be part of a coupling geometry.Finally, the invention relates to a turning method for manufacturing a spectacle lens, wherein a surface of a lens blank is machined with the cutting edge of a cutting tool of a lathe according to one of claims 20 to 28 such that a non-rotationally symmetrical surface is produced by a movement of the turning tool actuator that correlates with the rotation angle of the lens blank. The advantageous supply of coolant from the rear into the turning tool holder is particularly beneficial here, because the high rotational speeds of the lens blank also result in very fast movements of the turning tool actuator. Accordingly, there is no supply hose flinging back and forth in the working area that could, for example, obstruct a coolant jet, throw chips through the working area, or subject long chips to tensile stress.

[0055] Further features, details and advantages of the invention will become apparent from the wording of the claims and from the following description of exemplary embodiments with reference to the drawings. The drawings show:

[0056] Fig. 1a shows a side view of a rotary tool with partial sections;

[0057] Fig. 1b shows a longitudinal section along the section plane CC of the turning tool according to Fig. 1a; Fig. 2 shows an exploded view with two turning tools on a front side of a mounting plate and a connecting piece on the back side of the mounting plate; Fig. 3 shows a sketch of essential components of a lathe comprising a cross-section through the assembled arrangement according to Fig. 2 and a schematically indicated workpiece with workpiece holder and workpiece spindle;

[0058] Fig. 4 shows a perspective view of the mounted arrangement according to Fig. 2 on a rotary tool actuator.

[0059] Fig. 1a shows a side view of a turning tool 60 with partial sections and a section mark CC, wherein the section plane CC has two kinks to show the course of a cooling channel 3 in Fig. 1b. Figs. 1a and 1b are therefore described together, and identical reference numerals refer to identical features.

[0060] The turning tool 60 comprises a turning tool holder 1 and a cutting element 50. The turning tool holder 1 has a monolithic base body 2, which has a stop surface 21 for mounting on a lathe (see item 100 in Fig. 3) at one end and, spaced apart from this, a tool mounting position 22 for receiving the cutting element 50 at an opposite second end. The base body 2 tapers from the stop surface 21 towards the tool mounting position 22. The stop surface 21 faces away from the tool mounting position 22. In the area of ​​the stop surface 21, fastening geometries 24 are formed for fastening the base body 2 to a lathe (see item 100 in Fig. 3) or a mounting plate 104 thereof (see item in Figs. 2, 3, 4), wherein these are screw holes and further form-fitting contours, namely alignment edges and bores for guide bolts (see in particular Fig. 3).

[0061] The coolant channel 3 is formed in the base body 2, which has an inlet 31 and, in this case, two outlets 32 (one or more outlets are also possible, as are two or more inlets). The inlet 31 is located in the area of ​​the stop surface 21 in such a way that it is surrounded by the latter. This allows for a concealed channel connection in the area of ​​the stop surface 21 when the base body 2 is mounted on a receiving surface (see item 101 in Figures 2 and 3) of a lathe (see item 100 in Figure 3). The inlet 31 has sealing surfaces 33 in the form of a cylindrical bore, which is surrounded by the stop surface 21. The sealing surfaces 33 of the inlet 31 thus form part of a coupling geometry 34 into which a coupling pin, e.g., with an O-ring, can be inserted.

[0062] The tool holder 22 has mounting geometries 25 for securing the cutting element 50 with a cutting edge 51. In this case, the cutting element 50 is mounted on the tool holder 22 and attached to the base body 2. This is, in particular, a round cutting insert. Figure 2 also shows a second embodiment with a diamond-shaped cutting insert. The mounting geometries 25 include a receiving recess 26 adjacent to the circumference, into which the cutting element 50 is inserted. The mounting geometries 25 also include a screw hole 27, namely a threaded hole into which a fastening screw is screwed. The cutting edge 51 of the cutting element 50 projects beyond the base body 2. For this purpose, the tool holder 22 is arranged on an edge of the base body 2. The cutting edge 51 of the cutting element 50 is aligned such that it points past the base body 2 at a distance from it.

[0063] The cooling channel 3 runs in front of the two outlets at an angle that allows the required channel cross-sections in the volumetric body and parallel to a support surface 23 of the tool holder 22. It approaches the support surface 23 ever closer and close to the tool holder 22, exiting into the surroundings of the base body 2 in such a way that its respective exit jets S1 and S2 are directed towards the cutting edge 51 of the cutting element 50 mounted on the tool holder 22. The cutting edge 51 points past the outlets 32 in such a way that the exit jets S1 and S2 intersect the cutting edge 51, with the cutting edge 51 projecting only minimally into or being tangent to the exit jets S1 and S2. As can be seen, the coolant channel 3 has a smaller overall cross-section in front of the outlets 32 than in the area of ​​the inlet 31.

[0064] In the exploded view of Fig. 2, the turning tool 60 comprising the cutting element 50 and the turning tool holder 1 with stop surface 21 and coolant channel 3 is shown. Adjacent to this is a second turning tool 60' with turning tool holder T and stop surface 21', the cutting element of which is a diamond-shaped cutting insert. This cutting insert has, in particular, a smaller cutting radius than the first turning tool 60. This allows for initial coarser turning, followed directly by a finer turning process without changing workstations or tools.

[0065] Adjacent to the rotary tools 60, 60', a mounting plate 104 is visible, comprising a main plate and a ring. A rubber sleeve can be attached between the main plate and the ring, separating a wet-side inner surface of a working chamber from a dry-side outer surface of the mounting plate 104. Distribution channels 108 are formed between the main plate and the ring, which are fluidly connected via channels in the main plate to connection openings 103, 103' in the form of pins with O-rings. These pins each form a coupling geometry 106 with sealing surfaces 105. When the rotary tools 60, 60' are mounted, each coupling geometry 106 engages in one of the openings (see Fig. 31 in Figs. 1a and 1b) of the rotary tool holders 1, 1'. The mounting plate 104 thus also serves as a distribution plate for the coolant.

[0066] The ring has two additional outlet nozzles 107, which are connected to the distribution channels 108. These are oriented circumferentially towards the rotary tools 60, 60' located further in the center and each has a pivotable outlet ball for adjusting the jet direction.

[0067] Opposite the two rotary tools 60, 60' arranged on the front of the mounting plate 104, a connecting piece 110 is shown on the rear of the mounting plate 104. This is designed as an angled piece to create an offset to a push rod of a rotary tool actuator 102, on which the mounting plate 104 is to be mounted. Two connecting couplings 111, in particular quick-release couplings, for hoses are to be screwed into the connecting piece 110. The connecting piece 110 opens from the rear of the mounting plate 104 into its distribution channel 108.

[0068] Figure 3 shows a sketch of essential components of a lathe 100, comprising a cross-section through the assembled arrangement according to Figure 2 and a schematically indicated workpiece with workpiece holder 121 and workpiece spindle 120. The workpiece spindle 121 rotates the workpiece holder 121 with the workpiece, in particular a lens blank, about an axis of rotation A.

[0069] The rotary tool actuator 102 has a receiving surface 101, namely in the form of the receiving surface 101 of the mounting plate 104, against which the stop surface 21 of the base body 2 of the rotary tool holder 1 rests. The coupling geometries 34, 106 form a sealed connection between the connection opening 103 in the area of ​​the receiving surface 101 on the one hand and the opening 31 of the coolant channel 3 of the base body 2 on the other. The rotary tool actuator 102 is a linear drive from the group consisting of moving-coil actuators, piezo drives, and fast-tool servos (see Fig. 4).

[0070] With the rotary tool 60 supplied with coolant in this way, a surface of a lens blank can now be machined with the cutting edge 51 of the cutting tool 50 in such a way that a non-rotationally symmetrical surface is produced by a linear movement of the rotary tool actuator 102 which correlates with the rotation angle of the lens blank.

[0071] The invention is not limited to one of the embodiments described above, but can be modified in many ways.

[0072] Alternatively, the coolant channel 3 can also form a closed cooling channel loop through the base body 2. The outlet 32 ​​then preferably occurs in the same way as the inlet 31 in the area of ​​the stop surface 21.

[0073] All features and advantages arising from the claims, the description, and the drawings, including design details, spatial arrangements, and process steps, can be essential to the invention, both individually and in various combinations. Reference numerals list

[0074] 100 Turning tool holder 101 Lathe mounting surface 102 Turning tool actuator stop surface 103 Connection opening 104 Mounting plate 105 Sealing surfaces 106 Coupling geometry (stop surface) 107 Outlet nozzles 108 Distribution channels (tool mounting position)

[0075] Receipt recess 110, connector, screw hole 111, coupling

[0076] Coolant channel 120 Workpiece spindle inlet 121 Workpiece holder outlet

[0077] Sealing surface A Rotation axis Coupling geometry 51 Exit jet 52 Exit jet Cutting element

[0078] Cut

[0079] Rotary tool

Claims

Patent claims 1. Turning tool holder (1) with a base body (2) which has a stop surface (21) for mounting on a lathe (100) and forms a tool holding position (22) for receiving a cutting element (50), wherein a coolant channel (3) is formed in the base body (2) which has an inlet (31) and at least one outlet (32), characterized in that the inlet (31) is located in the area of ​​the stop surface (21).

2. Rotary tool holder (1) according to claim 1, characterized in that the opening (31) is located in the area of ​​the stop surface (21) such that when the base body (2) is mounted on a receiving surface (101) of a lathe (100) a concealed channel connection can be formed in the area of ​​the stop surface (21).

3. Rotary tool holder (1) according to one of claims 1 or 2, characterized in that the opening (31) has sealing surfaces (33) which are surrounded by the stop surface (21) or partial surfaces thereof.

4. Rotary tool holder (1) according to claim 3, characterized in that the sealing surfaces (33) of the inlet (31) are part of a coupling geometry (34).

5. Rotary tool holder (1) according to one of the preceding claims, characterized in that the at least one outlet (32) a) is located in the area of ​​the tool holding position (22), in particular such that an exit jet (S1) is directed towards a cutting edge (51) of a cutting element (50) which is mounted on the tool holding position (22) and attached to the base body (2); or b) is located in the area of ​​the stop surface (21), in particular such that when mounting the base body (2) on a receiving surface (101) of a lathe (100) a concealed channel connection can be formed in the area of ​​the stop surface (21).

6. Rotary tool holder (1) according to any one of claims 1 to 4, characterized in that the coolant channel (3) has exactly or at least two outlets (32) located in the area of ​​the tool mounting position (22), in particular such that their respective discharge jets (S1, S2) are directed onto a cutting edge (51) of a cutting element (50) which is mounted on the tool mounting position (22) and attached to the base body (2).

7. Rotary tool holder (1) according to any one of the preceding claims, characterized in that the coolant channel (3) has a smaller cross-section upstream of the at least one outlet (32) than in the area of ​​the inlet (31).

8. Rotary tool holder (1) according to one of the preceding claims, characterized in that a nozzle piece is arranged in or at the outlet (32).

9. Rotary tool holder (1) according to one of the preceding claims, characterized in that the coolant channel (3) runs substantially below the tool holding position (22) in front of the at least one outlet (32), preferably at least substantially parallel (+ / - 15 degrees) to a support surface (23) of the tool holding position (22).

10. Rotary tool holder (1) according to one of the preceding claims, characterized in that the base body (2) is monolithic or is permanently joined together from several individual parts.

11. Rotary tool holder (1) according to one of the preceding claims, characterized in that the tool holding position (22) is arranged at a distance from the stop surface (21).

12. Rotary tool holder (1) according to one of the preceding claims, characterized in that the tool receiving position (22) and the stop surface (21) are arranged at opposite ends of the base body (2).

13. Rotary tool holder (1) according to one of the preceding claims, characterized in that the base body (2) tapers from the stop surface (21) towards the tool holding position (22).

14. Turning tool holder (1) according to one of the preceding claims, characterized in that fastening geometries (24) for fastening the base body (2) to a lathe (100) are formed in the area of ​​the stop surface (21), in particular screw holes and / or form-fitting contours.

15. Rotary tool holder (1) according to one of the preceding claims, characterized in that the tool mounting position (22) has mounting geometries (25) for mounting a cutting element (50), in particular a cutting insert.

16. Rotary tool holder (1) according to claim 15, characterized in that the mounting geometries (25) have a receiving countersink (26) and / or a screw hole (27), in particular a threaded hole.

17. Rotary tool (60) with a rotary tool holder (1) according to one of the preceding claims and a cutting element (50) with a cutting edge (51) which is received on the tool mounting position (22) and attached to the base body (2).

18. Rotary tool (60) according to claim 17, characterized in that the cutting element (50) with the cutting edge (51) projects beyond the base body (2).

19. Rotary tool (60) according to one of claims 17 or 18, characterized in that the cutting edge (51) of the cutting element (50) is aligned such that it points past the base body (2) at a distance from it.

20. Rotary tool (60) according to one of claims 17 to 19, characterized in that the cutting edge (51) of the cutting element (50) points past the at least one outlet (32), in particular such that an exit jet (S1 , S2) of the at least one outlet (32) has an intersection point with the cutting edge (51).

21. Lathe (100) with a rotary tool actuator (102) and with a rotary tool holder (1) according to one of claims 1 to 16 or a rotary tool (60) according to one of claims 17 to 20, wherein the rotary tool actuator (102) has a receiving surface (101) against which the stop surface (21) of the base body (2) of the rotary tool holder (1) rests, wherein a connection opening (103) is formed in the area of ​​the receiving surface (101) which is fluid-tightly connected to the inlet (31) of the coolant channel (3) of the base body (2).

22. Lathe (100) according to claim 21, characterized in that the turning tool actuator (102) is a linear drive, and the receiving surface (101) is formed on a mounting plate (104) of the linear drive.

23. Lathe (100) according to claim 22, characterized in that the linear drive is from the group consisting of a moving coil actuator, a piezo drive and a fast-tool servo.

24. Lathe (100) according to one of claims 21 to 23, characterized in that it has a workpiece spindle (120) which has a workpiece holder (121) driven to rotate about a rotary axis (A) and which is designed to receive a workpiece, in particular a lens blank.

25. Lathe (100) according to one of claims 21 to 24, characterized in that the connection opening (103) is located in the area of ​​the receiving surface (101) such that the mounting of the base body (2) on the receiving surface (101) forms a concealed channel connection in the area of ​​the stop surface (21).

26. Lathe (100) according to one of claims 21 to 25, characterized in that the connection opening (103) has sealing surfaces (105) which are surrounded by the receiving surface (101) or partial surfaces thereof.

27. Lathe (100) according to claim 26, characterized in that the sealing surfaces (105) of the connection opening (103) are part of a coupling geometry (106).

28. Lathe (100) according to one of claims 21 to 27, characterized in that a second connection opening is formed in the area of ​​the receiving surface (101), wherein the at least one outlet (32) is located in the area of ​​the stop surface (21) such that by mounting the base body (2) on the receiving surface (101) a concealed channel connection to the second connection opening in the area of ​​the stop surface (21) is formed.

29. Lathe (100) according to claim 28, characterized in that the coolant channel (3) forms a closed coolant channel loop through the base body (2).

30. Turning method for manufacturing a spectacle lens, wherein a surface of a lens blank is machined with the cutting edge (51) of a cutting tool (50) of a lathe (100) according to one of claims 21 to 29 such that a non-rotationally symmetric surface is produced by a movement of the turning tool actuator (102) that correlates with the rotation angle of the lens blank.

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