HUB FLANGE FOR A TOOL BODY

Abstract

A hub flange has a fixed flange configured to receive a tool body. A flange socket is formed on the fixed flange for connection to a spindle shaft. A counterflange is detachably connected to the fixed flange. The fixed flange and the counterflange are connected to each other via a conical connection, wherein the conical connection is arranged coaxially to the tool axis and is formed by an inner cone and an outer cone received therein.

Claims

1. A hub flange for a tool body, comprising: a fixed flange defining a tool axis, the fixed flange being configured to receive the tool body, wherein a first flange socket is formed on the fixed flange for connection to a first spindle shaft which is rotatable about the tool axis; and a counterflange which is detachably connected to the fixed flange, wherein the fixed flange and the counterflange are connected to each other via a conical connection, the conical connection being arranged coaxially with respect to the tool axis and being formed by an inner cone and an outer cone received in the inner cone.

2. The hub flange of claim 1, wherein a second flange socket is formed on the counterflange for connection to a second spindle shaft which is rotatable about the tool axis.

3. The hub flange of claim 1, wherein the inner cone is formed on the fixed flange and the outer cone is formed on the counterflange, or wherein the inner cone is formed on the counterflange and the outer cone is formed on the fixed flange.

4. The hub flange of claim 1, wherein a first plane contact surface is formed adjacent to the inner cone and a second plane contact surface oriented opposite the first plane contact surface is formed adjacent to the outer cone, wherein the first and second plane contact surfaces extend orthogonally to the tool axis, and wherein the fixed flange and the counterflange are pressed together at the first and second plane contact surfaces so as to establish a friction fit.

5. The hub flange of claim 4, wherein the first plane contact surface is arranged adjacent to the inner cone on the front side, and wherein the second plane contact surface surrounds the outer cone.

6. The hub flange of claim 1, comprising a plurality of axial screws axially pressing the fixed flange and the counterflange together at the conical connection.

7. The hub flange of claim 1, wherein the hub flange defines first and second clamping surfaces such that the tool body is axially clampable between the first and second clamping surfaces.

8. The hub flange of claim 7, comprising a positioning ring having an axially variable position relative to the counterflange, wherein the first clamping surface is formed on the fixed flange, and wherein the second clamping surface is formed on the positioning ring.

9. The hub flange of claim 8, wherein the counterflange or the fixed flange has an external thread and the positioning ring has an internal thread complementary thereto, in order to change the axial position of the positioning ring by a screwing movement of the positioning ring relative to the counterflange.

10. The hub flange of claim 9, comprising an intermediate ring disposed axially adjacent to the positioning ring for transmitting an axial clamping force from the positioning ring to the tool body.

11. The hub flange of claim 8, wherein the positioning ring is axially displaceable on the fixed flange and/or on the counterflange, and wherein the hub flange comprises a plurality of threaded elements screwed into the counterflange or into the positioning ring to change the axial position of the positioning ring relative to the counterflange.

12. The hub flange of claim 1, wherein the first and/or second flange sockets is formed as an inner or outer cone with a plane contact surface.

13. The hub flange of claim 1, comprising an axial through bore.

14. A machining tool, comprising: a hub flange according to claim 1; and a tool body which is clamped on the hub flange.

15. A tool head for a machine tool comprising: a machining tool according to claim 14, a first spindle unit with a first spindle shaft which is mounted in the first spindle unit so as to be rotatable about the tool axis; and a second spindle unit with a second spindle shaft which is mounted in the second spindle unit so as to be rotatable about the tool axis, wherein the first spindle unit and the second spindle unit are arranged coaxially with respect to each other in such a way the machining tool is receivable axially between the first spindle shaft and the second spindle shaft.

16. The tool head of claim 15, wherein the machining tool is axially clamped between the first spindle shaft and the second spindle shaft such that an axial compression force acts on both sides of the machining tool.

17. The tool head of claim 16, wherein the second spindle shaft and the machining tool each have an axial through bore, wherein the tool head comprises a pull rod extending through the axial through bores of the second spindle shaft and the machining tool, the pull rod being connectable at one end to the first spindle shaft, and wherein the pull rod is connectable at a second end to the second spindle shaft in such a way that an axial compression force can be generated on the machining tool between the first spindle shaft and the second spindle shaft.

18. The machining tool of claim 14, wherein the tool body is a grinding body.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Preferred embodiments of the invention are described below with reference to the drawings, which are for explanatory purposes only and are not to be construed in a limiting manner.

[0055] In the drawings,

[0056] FIG. 1 shows a grinding tool comprising a hub flange according to the prior art, in a central longitudinal section;

[0057] FIG. 2 shows a grinding tool comprising a hub flange according to a first embodiment of the present invention, in a perspective view;

[0058] FIG. 3 shows the grinding tool of FIG. 2 in a central longitudinal section;

[0059] FIG. 4 shows the hub flange of the grinding tool of FIG. 2 in a perspective view;

[0060] FIG. 5 shows an enlarged detail of the hub flange of FIG. 4 in a central longitudinal section in the plane V-V of FIG. 6;

[0061] FIG. 6 shows the hub flange of FIG. 4 in a frontal view of the counterflange;

[0062] FIG. 7 shows a part of a central longitudinal section through a grinding tool with a hub flange according to a second embodiment;

[0063] FIG. 8 shows a part of a central longitudinal section through a grinding tool with a hub flange according to a third embodiment;

[0064] FIG. 9 shows a part of a central longitudinal section through a grinding tool with a hub flange according to a fourth embodiment;

[0065] FIG. 10 shows a tool head in a schematic perspective view;

[0066] FIG. 11 shows the tool head of FIG. 10 in a perspective sectional view;

[0067] FIG. 12 shows a clamping nut in a central longitudinal section;

[0068] FIG. 13 shows a perspective view of the clamping nut of FIG. 13; and

[0069] FIG. 14 shows a machine tool for hard finishing of gears by generating gear grinding in a schematic perspective view.

DESCRIPTION OF PREFERRED EMBODIMENTS

Definitions

[0070] Gear cutting machine: A machine configured to produce or machine gear teeth on workpieces, in particular internal or external gear teeth of gears. For example, a gear cutting machine can be a machine for fine machining, with which pre-toothed workpieces are machined, in particular a hard finishing machine with which pre-toothed workpieces are machined after hardening. A gear cutting machine comprises a machine control system programmed to control automatic machining of the gear teeth.

[0071] Generating machining of gears: A type of gear machining in which a tool rolls on a workpiece, producing a cutting motion. Various gear generating machining processes are known, whereby a distinction is made between processes with a geometrically undefined cutting edge, such as gear grinding or gear honing, and processes with a geometrically defined cutting edge, such as gear hobbing, gear peeling, gear shaving or gear shaping.

[0072] Generating gear grinding: The generating gear grinding process is a continuous chip-removing process with a geometrically undefined cutting edge for the production of axially symmetrical periodic structures, in which a grinding wheel with a worm-shaped profiled outer contour (grinding worm) is used as the tool. Tool and workpiece are mounted on rotation spindles. By coupling the rotation movements of tool and workpiece around the rotation axes, the rolling motion typical of the process is realized. This rolling motion and an axial feed motion of the tool or the workpiece along the workpiece axis generate a cutting motion.

[0073] Tool head: In the present document, the term tool head refers to an assembly configured to receive and drive a machining tool for rotation. In particular, the tool head may be mounted on a swivel body and/or one or more slides to align and position the tool relative to a workpiece.

[0074] Spindle unit: In machine tool construction, a rotatable shaft on which a tool or workpiece can be clamped is usually referred to as a spindle. However, an assembly which, in addition to the rotatable shaft, also includes the associated spindle bearings for rotatably bearing the shaft and the associated housing is also frequently referred to as a spindle. In the present document, the term spindle is used in this sense. The shaft alone is referred to as the spindle shaft. An assembly comprising, in addition to the spindle shaft, at least the associated spindle bearings is referred to as a spindle unit. A spindle unit may comprise its own housing, but it may also be accommodated in a common housing together with another spindle unit.

Hub Flange According to the First Embodiment

[0075] FIGS. 2 and 3 illustrate a machining tool 100. The machining tool 100 comprises a hub flange 101 in which a tool body 130 is clamped. The hub flange 101 is shown alone in FIGS. 4 to 6. Functionally similar parts are provided with the same reference signs as in FIG. 1.

[0076] In the present example, the tool body 130 is a grinding tool. Thus, the machining tool 100 in the present example is a grinding tool. However, other types of tool bodies 130 may also be provided.

[0077] The hub flange 101 defines a tool axis B about which it can rotate. It comprises a fixed flange 110 and a counterflange 120. The fixed flange 110 has, at its right-hand end in FIG. 3, a first flange socket 111 for connection to a first spindle shaft. In the present example, the first flange socket 111 is formed as an inner cone (taper socket) with a plane contact surface arranged inside the inner cone, specifically as a short taper receptacle 1:4 according to DIN ISO 702-1:2010-04. The fixed flange 110 has a cylindrical outer lateral surface 112. The lateral surface 112 is delimited by a collar 113 at that end of the fixed flange 110 at which the first flange socket 111 is formed. The collar 113 has an enlarged outer diameter. It forms an annular first clamping surface 114 for the tool body 130. The first clamping surface 114 extends in a plane orthogonal to the tool axis B. A central bore 116 extends along the tool axis B through the fixed flange 110. Positioning bores 117 serve to position and fix the fixed flange 110 in the circumferential direction during clamping of the tool body 130. A machine-readable data carrier, for example an RFID tag or an optical code, may be arranged in a receiving notch 118 on the outer circumference. Balancing holes 119 are provided for balancing and/or allow additional balancing weights to be attached. At its left-hand end in FIG. 3, i.e. at the end facing away from the first flange socket 111, a further inner cone (taper socket) 151 is formed on the fixed flange 110. This inner cone 151 is particularly well visible in FIG. 5. The region of the end face of the fixed flange 110 adjacent to the inner cone 151 and surrounding the inner cone 151 forms a first plane contact surface 153. The first plane contact surface 153 extends orthogonally to the tool axis B.

[0078] The counterflange 120 has a second flange socket 121 at its end located on the left in FIG. 3, i.e. at the end facing away from the first flange socket 111. Here, the second flange socket 121 is also formed as an inner cone (taper socket) with a plane contact surface arranged inside the inner cone, specifically as a short taper receptacle 1:4 according to DIN ISO 702-1:2010-04. At its end located on the right in FIG. 3, i.e. at its end facing the fixed flange 110, an outer cone (taper) 152 is formed on the counterflange 120, which is complementary to the inner cone (taper socket) 151 on the fixed flange 110. The outer cone 152 is radially surrounded by an annular second plane contact surface 154 (see FIG. 6), which faces the first plane contact surface 153 on the fixed flange. A central bore 126 extends along the tool axis B through the counterflange 120. The bore 126 is aligned with the bore 116 of the fixed flange 110. The bores 116, 126 together form a continuous axial bore through the hub flange 101.

[0079] The counterflange 120 is connected to the fixed flange 110 via a conical connection with face contact. The taper connection 150 is established by the inner taper 151 on the fixed flange 110 and the complementary outer taper 152 on the counterflange 120. The face contact is made at the two complementary plane contact surfaces 153, 154.

[0080] An essential advantage of this construction is that, due to this division of the hub flange, especially in the case of small grinding wheels, the diameters of the flange sockets 111, 121 for the transmission of the torque may be selected decisively larger on both sides than if both flange sockets were arranged on the fixed flange. However, since any separation is also disadvantageous, a connection with high rigidity is required. This is ensured by the conical connection with face contact. In addition, this type of connection also ensures that the fixed flange 110 and the counterflange 120 fit perfectly again after each grinding wheel change and can be easily separated again.

[0081] The counterflange 120 is fixed to the fixed flange 110 by a plurality of cap screws 125 evenly distributed in the circumferential direction. The cap screws 125 generate a defined axial contact pressure force between the fixed flange 110 and the counterflange 120. This axial contact pressure force is transmitted directly via the conical connection with face contact between the fixed flange 110 and the counterflange 120.

[0082] An external thread 127 is formed on an outer lateral surface of the counterflange 120. A positioning ring 140 is screwed onto the external thread 127. A plurality of longitudinal grooves 141 are formed on the outer circumference of the positioning ring 140 to allow the positioning ring 140 to be rotated with a suitable wrench. The positioning ring 140 can be fixed to the counterflange 120 with radial fixation pins 142, to prevent unintentional rotation of the positioning ring 140. The positioning ring 140 forms a second clamping surface 144 on its end face facing the fixed flange 110. The second clamping surface 144 extends in a plane that is perpendicular to the tool axis B. The second clamping surface faces in the direction of the first clamping surface 114 on the fixed flange 110.

[0083] The tool body 130 has a central bore along the tool axis B. The tool body 130 is pushed with this bore onto the fixed flange 110. In the region of its bore, it rests with an inner lateral surface on the outer lateral surface 112 of the fixed flange 110. The tool body 130 is axially supported on the first clamping surface 114 on the fixed flange 110. A thin intermediate washer 131, which may be made of e.g. aluminium, may be provided between the tool body 130 and the first clamping surface 114. The tool body 130 is fixed to the hub flange 101 by means of the positioning ring 140 and an intermediate ring 145. Again, a thin intermediate washer 132 may be provided between the tool body and the intermediate ring 145, which again may be made of aluminium. In this case, the positioning ring 140 exerts an axial clamping force on the tool body 130 with the second clamping surface 144 via the intermediate ring 145 and, if applicable, the intermediate washer 132. By suitable positioning of the positioning ring 140, this axial clamping force may be adjusted independently of the axial contact pressure between the fixed flange 110 and the counterflange 120.

[0084] To clamp the tool body 130, the following procedure is followed. First, the counterflange 120 is loosened from the fixed flange 110. The positioning ring 140 is screwed back as far as possible in the direction of the second flange socket 121, and the intermediate ring 145 is pushed back as far as possible. The tool body 130 and, if necessary, the intermediate washers 131, 132 are slid onto the fixed flange 110, and the counterflange 120 is fixed to the fixed flange 110 by the screws 125. The screws 125 are now tightened until there is a sufficient axial contact force between the fixed flange 110 and the counterflange 120. The tool body 130 is not yet axially clamped during this process. Only after the connection between the fixed flange 110 and the counterflange 120 has been established, the positioning ring 140 is now screwed forward until the desired axial clamping force is applied to the tool body 130 via the intermediate ring 145. The axial clamping force on the tool body 130 is thus set independently of the axial contact force between the fixed flange 110 and the counterflange 120.

[0085] The hub flange 101 may be configured to accommodate only a particular type of tool body 130. For example, depending on the type of tool body 130, different outer diameters of the outer lateral surface 112 may be provided. In particular, a larger outer diameter may be provided for abrasive bodies with abrasive grains of corundum than for abrasive bodies with abrasive grains of cBN. In this way, it is reliably prevented that a cBN abrasive body may be mistakenly mounted on a hub flange provided for a corundum abrasive body and vice versa. Instead of having different diameters for different tool types, this can also be achieved by different shaping, e.g. by providing grooves, forming a polygonal region, or forming a serration on the hub flange.

[0086] To ensure that the two flange sockets 111, 121 are precisely aligned with each other, the fixed flange 110 and the counterflange 120 are each manufactured in pairs, including balancing.

Second to Fourth Embodiment

[0087] In FIG. 7, a second embodiment is illustrated. This embodiment differs from the first embodiment primarily in the manner in which the tool body 130 is clamped in the hub flange 101. As in the first embodiment, a positioning ring 140 is provided for this purpose. This positioning ring is axially displaceable relative to the counterflange 120. A plurality of adjusting screws 146 in the form of cap screws are screwed into the positioning ring 140. The adjusting screws 146 are evenly distributed in the circumferential direction. They are axially supported on the counterflange 120, so that they are prevented from moving axially in the direction of the second flange socket 122. When the cap screws 146 are screwed out of the positioning ring 140, they press the positioning ring 140 axially against the tool body 130, thereby generating an axial clamping force.

[0088] In FIG. 8, a third embodiment is illustrated. This embodiment also differs from the first embodiment primarily in the manner in which the tool body 130 is clamped in the hub flange 101. Again, the positioning ring 140 is axially displaceable relative to the counterflange 120. Positioning pins 147 in the form of set screws, which are guided in threads in the counterflange 120, serve this purpose. When the positioning pins 147 are screwed into the counterflange, they push the positioning ring 140 axially against the tool body 130 to create the axial clamping force.

[0089] FIG. 9 illustrates a fourth embodiment. This embodiment corresponds largely to the third embodiment. However, in contrast to the third embodiment, axial spring elements 148 in the form of spring bushings are arranged in the positioning ring 140. The positioning pins 147 act on these spring elements. Due to their elastic properties, the spring elements ensure that a sufficient axial clamping force is still applied to the tool body 130 even if the length of the tool body 130 changes, for example due to settling processes in the tool body 130.

[0090] Tool Head with Machining Tool

[0091] FIGS. 10 and 11 illustrate a tool head with a machining tool 100 according to one of the embodiments discussed above. For the sake of clarity, the machining tool 100 is shown only schematically.

[0092] The tool head includes a base 310. A linear guide 311 is formed on the base 310. A first spindle unit 320 and a second spindle unit 330 are displaceable guided along a shift direction Y on the linear guide 311. For this purpose, the spindle units each have corresponding guide shoes 326, 336. The machining tool 100 is held between the spindle units 320, 330. The tool axis B runs parallel to the shift direction Y.

[0093] The second spindle unit 320 and the first spindle unit 330 can be coupled to each other after the machining tool 100 is received between them. When coupled, they can be moved together along the shift direction Y by a shift drive not shown in the drawing and a ball screw 312 to change the tool area that is in engagement with a workpiece along the tool axis.

[0094] In the present example, the spindle unit 320 is a motorized spindle having a drive motor 324 that drives a first spindle shaft 322 to rotate about the tool axis B. The first spindle shaft 322 is supported in spindle bearings 323 in the spindle housing 321 of the first spindle unit 320. In the present example, the second spindle unit 330 is a counter spindle with a non-driven second spindle shaft 332 supported in the spindle housing 331 of the second spindle unit 330 in spindle bearings 333. However, both spindle units 320, 330 may instead be driven.

[0095] At the tool-side ends of the spindle shafts 322, 332, opposing spindle sockets in the form of spindle noses 325, 335 are formed. The shape of the spindle noses is complementary to the shape of the flange sockets 111, 121 of the hub flange 101 of the machining tool 100, each having a conically tapered shape pointing towards the machining tool 100 and a plane contact surface on their respective end face. For example, each spindle nose may be formed as a tapered shank 1:4 according to DIN ISO 702-1:2010-04.

[0096] Thus, there is a conical connection with a face contact between each of the flange sockets 111, 121 and the spindle noses 325, 335. The conical connections may have different diameters at the two ends of the machining tool 100 to ensure that the machining tool 100 can only be received in the correct orientation between the spindle noses 325, 335.

[0097] The machining tool 100 is axially clamped between the spindle noses 325, 335 by a pull rod 370 and a clamping nut 372. For this purpose, the machining tool 100 and the second spindle shaft 332 each have a central axial bore extending therethrough. At its tool end, the first spindle shaft 322 also has a central axial bore. An internal thread is formed in this bore. The pull rod 370 is inserted through the central bores of the spindle shaft 332 and the machining tool 100. At its end facing the first spindle unit 320, the pull rod 370 has an external thread which is screwed into the internal thread of the first spindle shaft 322. At its other end, it also has an external thread. The clamping nut 372 is screwed onto this external thread. By tightening the clamping nut 372, the clamping nut 372 exerts an axial pressure on the second spindle shaft 332 in the direction of the machining tool 100. This causes the machining tool 100 to be axially clamped between the spindle noses 325, 335. The result is a single continuous shaft with high bending and torsional rigidity.

[0098] A first balancing unit 350 is arranged on the first spindle shaft 322 in the axial region between the housing 321 of the first spindle unit 320 and the machining tool 100. A second balancing unit 360 is arranged on the second spindle shaft 332 axially between the housing 331 of the second spindle unit 330 and the machining tool 100. The balancing units 350, 360 surround the respective spindle shaft 322, 332 outside the housing of the respective spindle unit 320, 330. They each comprise a housing which tapers from the associated spindle unit towards the machining tool 100. The tapered outer contour of the balancing units 350, 360 reduces the risk of collision between the balancing units and a workpiece. Each of the balancing units 350, 360 is configured as a ring balancing system. The two balancing units 350, 360 serve to balance the system comprising the machining tool 100 and the spindle shafts 322, 332 clamped thereto in two balancing planes. Alternatively, it is conceivable to arrange at least one balancing element in the hub flange.

[0099] Clamping Nut

[0100] FIGS. 12 and 13 illustrate an exemplary clamping nut 372, such as may be used in the tool head described above.

[0101] The clamping nut 372 includes a base element 373 defining a central bore having an internal thread for screwing the base element 373 onto a pull rod having a corresponding external thread. At one end, the base element 373 is externally formed in the manner of a hex nut. A support ring 374 is mounted on the base element 373. It rests against a collar of the base element 373 in such a way that it is prevented from moving axially in one direction (to the left in FIG. 9). Furthermore, an annular axial push element 375 is axially displaceably guided on the base element 373. A plurality of actuating elements 376 in the form of pressure screws are screwed into the axial push element 375 and are axially supported on the support ring 374 in such a way that they are prevented from moving axially along one direction (to the left in FIG. 9). By unscrewing the pressure screws from the axial push element 375, the axial push element 375 is advanced relative to the base element 373 along the direction opposite to the supporting direction (to the right in FIG. 9).

[0102] In order to clamp a tool 100 between the two spindle shafts 322, 332, the axial push element 375 is first moved fully back relative to the base element 373 by screwing the pressure screws as far as possible into the axial pressure element 375. Now, the clamping nut 372 is screwed onto the pull rod 370 and, with the aid of the externally formed hexagon of the base element 373, is adjusted against the second spindle shaft 332. This is done with a relatively low torque. Subsequently, with the aid of the pressure screws, the annular axial push element 375 is advanced in a controlled manner in the direction of the second spindle shaft 332 until the desired clamping force acts on the tool 340. Thereby, the axial push element 375 bears against the second spindle shaft 332 with an annular contact surface.

[0103] Of course, other constructions of a clamping nut can also be used, as known per se from the prior art. For example, the transmission of force may be effected in a different manner than illustrated. In particular, a hydraulic clamping nut may can be used.

[0104] Instead of a clamping nut with internal thread, a clamping element may also be used which is connectable to the pull rod in a way other than via a screw connection, e.g. via a bayonet or via a clamping bush.

[0105] Configuration of an Exemplary Machine Tool

[0106] FIG. 14 illustrates an example of a machine tool for hard finishing of gears by generating gear grinding. The machine comprises a machine bed 600 on which a tool carrier 200 is arranged so as to be displaceable along a horizontal infeed direction X. A Z-slide 210 is arranged on the tool carrier 200 so as to be displaceable along a vertical direction Z. The Z-slide 210 carries a swivel body 220, which is pivotable relative to the Z-slide 210 about a horizontal swivel axis A. The pivot axis A is parallel to the infeed direction X. The tool head 300, shown only symbolically, is arranged on the pivot body 220. The shift direction Y is perpendicular to the X-axis and at an angle to the Z-axis adjustable about the A-axis.

[0107] Furthermore, a pivotable workpiece carrier in the form of a rotary turret 400 is arranged on the machine bed 600. The rotary turret 400 is pivotable about a vertical swivel axis C3 between several rotational positions. It carries two workpiece spindles 500, on each of which a workpiece 510 can be clamped. Each of the workpiece spindles 500 is drivable to rotate about a workpiece axis. In FIG. 12, the workpiece axis of the visible workpiece spindle 500 is designated C2. The workpiece axis of the workpiece spindle not visible in FIG. 12 is designated C1 axis. The two workpiece spindles are located on the rotary turret 400 in diametrically opposite positions (i.e., offset by 1800 with respect to the swivel axis C3). In this way, one of the two workpiece spindles can be loaded and unloaded while a workpiece is being machined on the other workpiece spindle. This largely avoids undesirable non-productive times. Such a machine concept is known, for example, from WO 00/035621 A1.

[0108] The machine has a machine control system 700, shown only symbolically, which includes a plurality of control modules 710 and a control panel 720. Each of the control modules 710 controls a machine axis and/or receives signals from sensors.

[0109] Other Variations

[0110] The interface between the spindle shafts 322, 332 and the machining tool 100 may also be formed differently than in the embodiments described above. In particular, a different type of conical connection may be used. Any known conical connections may be used, for example the embodiments A, BF, BM, CF or CM mentioned in DIN ISO 666:2013-12. For details, reference is made to DIN ISO 666:2013-12 and to the other standards mentioned therein DIN EN ISO 1119:2012-04, DIN ISO 702-1:2010-04, ISO 12164-1:2001-12 and ISO 12164-2:2001-12.

[0111] Instead of, as explained above, by a machine-readable data carrier, or in addition thereto, the identification of the hub flange or of the tool formed therewith may also be effected by other means, for example by a mechanical encoding. The coding may be carried out, for example, by means of one or more notches which allow a unique identification of at least the type of the hub flange.

[0112] The pull rod 370 may extend through the first spindle shaft 322 instead of through the second spindle shaft 332 and may be connected at its end to the second spindle shaft 332. Accordingly, the clamping element then exerts an axial force on the first spindle shaft in the direction of the second spindle shaft.

[0113] In order to clamp the machining tool 100 axially between the first spindle shaft 322 and the second spindle shaft 332, instead of a central pull rod or in addition thereto, two or more pull rods may be used which extend parallel to each other and radially spaced apart from the tool spindle axis B and are arranged at different angular positions relative to the tool spindle axis B.

[0114] The fixing and axial clamping of the machining tool 100 between the first spindle shaft and the second spindle shaft in compression may also be performed in a way other than with a continuous pull rod, for example with clamping systems arranged inside the respective spindle shaft. For this purpose, the connection between the machining tool and the spindle shafts may be made, for example, by means of hollow shank tapers (HSK) according to ISO 12164-1:2001-12 and ISO 12164-2:2001-12.

[0115] The tool body may be formed differently than in the embodiments explained above. In particular, the tool body may also be multi-part.

[0116] The tool body may be dressable or non-dressable. A non-dressable tool body may, for example, have a metallic base body with a hard material coating applied thereto. Such a tool body may in principle be mounted on the hub flange in the same way as a dressable tool body. Instead, however, it is also conceivable to manufacture a one-piece tool whose outer contour in the region of the connection points with the tool spindles is formed in accordance with the flange sockets 111, 121, the hard material coating being an integral component of this one-piece tool. The tool may then be identified in the same way as shown above for the hub flange, by means of a machine-readable data carrier and/or by mechanical encoding. Such one-piece tools may be part of a tool assortment comprising tools with the hub flange shown above as well as one-piece tools.

LIST OF REFERENCE SIGNS

[0117] 100 grinding tool [0118] 101 hub flange [0119] 110 fixed flange [0120] 111 first flange socket [0121] 112 outer lateral surface [0122] 113 collar [0123] 114 clamping surface [0124] 115 connection region [0125] 116 central bore [0126] 117 positioning bore [0127] 118 receiving notch [0128] 119 balancing bore [0129] 120 counterflange [0130] 121 second flange socket [0131] 122 outer surface [0132] 123 collar [0133] 124 clamping surface [0134] 125 cap screw [0135] 126 central bore [0136] 127 external thread [0137] 130 grinding wheel [0138] 131, 132 intermediate washer [0139] 140 positioning ring [0140] 141 longitudinal groove [0141] 142 fixation pin [0142] 144 clamping surface [0143] 145 intermediate ring [0144] 146 adjusting screw [0145] 147 positioning pin [0146] 148 spring element [0147] 150 conical connection [0148] 151 inner cone (taper socket) [0149] 152 outer cone (taper) [0150] 153 first plane contact surface [0151] 154 second plane contact surface [0152] 200 tool carrier [0153] 210 Z-slide [0154] 220 swivel body [0155] 300 tool head [0156] 310 base [0157] 311 linear guide [0158] 312 ball screw drive [0159] 320 first spindle unit [0160] 321 first spindle housing [0161] 322 first spindle shaft [0162] 323 first spindle bearing [0163] 324 drive motor [0164] 325 first spindle nose [0165] 326 guide shoe [0166] 330 second spindle unit [0167] 321 second spindle housing [0168] 332 second spindle shaft [0169] 333 second spindle bearing [0170] 335 second spindle nose [0171] 336 guide shoe [0172] 350 first balancing unit [0173] 360 second balancing unit [0174] 370 pull rod [0175] 372 clamping nut [0176] 400 rotary turret [0177] 500 workpiece spindle [0178] 510 workpiece [0179] 600 machine bed [0180] 700 machine control system [0181] 710 control module [0182] 720 control panel [0183] X, Y, Z linear axis [0184] A swivel axis [0185] B tool axis [0186] C1, C2 workpiece axis [0187] C3 tower swivel axis