Tool head, machine tool, tool spindle, and tool unit

Abstract

The invention relates to a tool head, a machine tool, a tool spindle and a tool unit. The tool head includes a tool mandrel, a tool, a first spindle, a second spindle, a first balancer, and a second balancer. The tool spindle, the tool, the first spindle, the second spindle, the first balancer and the second balancer are arranged coaxially with the axis of rotation. At least a portion of the first balancer is disposed between the tool and the first spindle in the axial direction. At least a portion of the second balancer is disposed between the tool and the second spindle in the axial direction. At least a portion of the first balancer is disposed radially inward of a radially inner end of the tool.

Description

Technical Field

[0001] This invention relates to a tool head, a machine tool, a tool spindle, and a tool unit. Background Technology

[0002] Machine tools for machining workpieces are known in the past. A machine tool includes a tool head that holds and rotates the tool. For example, Patent Document 1 describes a conventional machine tool that includes a tool head.

[0003] The tool head in Patent Document 1 includes a first spindle, a second spindle, a first balancing device, and a second balancing device. The tool is positioned between the first spindle and the second spindle. The first balancing device is positioned between the spindle bearing and the tool-side end of the first spindle. The second balancing device is positioned between the spindle bearing and the tool-side end of the second spindle.

[0004] [Patent Document 1] Japanese Patent Publication No. 2024-501807 Summary of the Invention

[0005] Patent Document 1's first balancing device radially surrounds the first spindle shaft. Furthermore, Patent Document 1's second balancing device radially surrounds the second spindle shaft. In this structure, the mass distribution of the balancing device is located at a point radially separated from the axis of rotation. Consequently, the moment of inertia of the balancing device increases. Therefore, the tool head of Patent Document 1 is not suitable for high-speed rotation.

[0006] Therefore, the purpose of this invention is to provide a tool head, machine tool, tool spindle, and tool unit that can easily rotate the tool at high speed.

[0007] The first invention is a tool head comprising: a cylindrical tool spindle extending axially along a rotation axis; a cylindrical tool held on the outer side of the tool spindle; a first spindle supporting a unit including the tool spindle for rotation at an axially adjacent side of the tool; a second spindle supporting the unit including the tool spindle for rotation at an axially adjacent side of the tool; a first balancer correcting the mass balance centered on the rotation axis at an axially adjacent side of the tool; and a second balancer correcting the mass balance centered on the rotation axis at an axially adjacent side of the tool, wherein the tool spindle, the tool, the first spindle, the second spindle, the first balancer, and the second balancer are coaxially arranged with respect to the rotation axis, at least a portion of the first balancer is axially disposed between the tool and the first spindle, at least a portion of the second balancer is axially disposed between the tool and the second spindle, and at least a portion of the first balancer is disposed radially inward beyond the radially inner end of the tool.

[0008] The second invention is a tool mandrel that extends along a rotation axis and holds a cylindrical tool on its outer circumferential surface. One axial end of the tool mandrel is configured to receive at least a portion of a first balancer radially inward, and the other axial end of the tool mandrel is configured to allow a mating flange to be coaxially fixed to the tool mandrel. The mating flange is configured to receive at least a portion of a second balancer radially inward. The tool is held between the one axial end and the other axial end, and at least a portion of the first balancer is disposed radially inward from the outer circumferential surface.

[0009] According to the first and second inventions, at least a portion of the first balancer is positioned radially inward from the innermost radial end of the tool. This allows the mass distribution of the first balancer to be positioned close to the axis of rotation. Consequently, it facilitates high-speed rotation of the tool. Attached Figure Description

[0010] Figure 1 This is the front view of the machine tool.

[0011] Figure 2 This is a top view of the machine tool.

[0012] Figure 3 This is a longitudinal sectional view of the tool head.

[0013] Figure 4 This is a partial longitudinal section view of the tool head near the first balancer.

[0014] Figure 5 This is a partial longitudinal section view of the tool head near the second balancer.

[0015] Figure 6 This is a longitudinal sectional view of the tool head in the first modified example.

[0016] Figure 7 This is a longitudinal sectional view of the tool head in the second variation.

[0017] Figure 8 This is a longitudinal sectional view of the tool, tool mandrel, mating flange, first balancer, and second balancer in the third variation.

[0018] Figure 9 This is a longitudinal sectional view of the tool, tool mandrel, mating flange, first balancer, and second balancer, which is another example of the third variation. Detailed Implementation

[0019] <1. Structure of the machine tool>

[0020] Figure 1 This is a front view of machine tool 1 according to one embodiment. Figure 2This is a top view of the machine tool 1 near the workpiece 9 and the tool head 20. The machine tool 1 is a device that processes the workpiece 9 using the tool 50. For example, the machine tool 1 is a grinding machine that grinds the workpiece 9. Furthermore, in Figures 1 to 7 In order to facilitate understanding of the main idea of ​​the invention, the actual product dimensions may differ from those in the accompanying drawings.

[0021] Workpiece 9 is, for example, a workpiece for forming a gear, which is manufactured by grinding to produce a high-quality tooth surface shape. Workpiece 9 is generally cylindrical and has multiple teeth 91 on its outer surface. Hereinafter, the central axis of workpiece 9 will be referred to as "workpiece axis X1".

[0022] like Figure 1 and Figure 2 As shown, the machine tool 1 includes a workpiece rotation mechanism 10, a tool head 20, a moving mechanism 30, and a control unit 40. The workpiece rotation mechanism 10, the tool head 20, and the moving mechanism 30 are mounted on a common base 90.

[0023] The workpiece rotation mechanism 10 is a mechanism that rotates the workpiece 9 about the workpiece axis X1. The workpiece rotation mechanism 10 includes: a pair of grippers that hold the workpiece 9; and a motor that rotates the grippers. In this embodiment, the workpiece 9 is held and rotated with the workpiece axis X1 facing vertically. However, the direction of the workpiece axis X1 may not necessarily be vertical.

[0024] The tool head 20 is a mechanism that holds and rotates the tool 50. The tool 50 is, for example, a grinding stone. The tool 50 is generally cylindrical and has a spiral groove 51 on its outer surface. Hereinafter, the central axis of the tool 50 will be referred to as the "tool axis X2". The tool head 20 holds the tool 50 in a horizontal position with the tool axis X2 as the center. Furthermore, the tool head 20 causes the tool 50 to rotate about the tool axis X2. The detailed structure of the tool head 20 will be described later. However, the tool head 20 can also hold the tool 50 in a position where the tool axis X2 is not horizontal.

[0025] The moving mechanism 30 is a mechanism that moves the tool head 20 relative to the workpiece 9. The moving mechanism 30 includes a first moving mechanism 31, a second moving mechanism 32, and a third moving mechanism 33. The first moving mechanism 31 moves the tool 50 relative to the workpiece 9 in a direction parallel to the workpiece axis X1. The second moving mechanism 32 moves the tool 50 relative to the workpiece 9 in a direction parallel to the tool axis X2. The third moving mechanism 33 moves the tool 50 towards and away from the workpiece 9.

[0026] The first moving mechanism 31, the second moving mechanism 32, and the third moving mechanism 33 are implemented, for example, by a motor and a ball screw that converts the rotation of the motor into linear motion. Through these first moving mechanisms 31, second moving mechanisms 32, and third moving mechanisms 33, the moving mechanism 30 can move the tool 50 relative to the workpiece 9 in any direction in three-dimensional space.

[0027] Alternatively, the moving mechanism 30 may also have a fourth moving mechanism for adjusting the cross angle of the tool axis X2 relative to the workpiece axis X1.

[0028] The control unit 40 is a unit that controls the operation of various parts of the machine tool 1. The control unit 40 is, for example, a computer having a processor such as a CPU, a memory such as RAM, and a storage unit such as a hard disk drive. The storage unit stores computer programs used to control the operation of the machine tool 1.

[0029] The control unit 40 is electrically connected to the workpiece rotation mechanism 10, the tool head 20, and the moving mechanism 30. The control unit 40 controls the operation of these parts according to the computer program described above. As a result, the workpiece 9 in the machine tool 1 is processed.

[0030] <2. Detailed Structure of the Tool Head>

[0031] Next, the detailed structure of the tool head 20 will be explained.

[0032] Figure 3 This is a longitudinal sectional view of tool head 20. (Example) Figure 3 As shown, the tool head 20 includes a tool 50, a tool spindle 21, a first spindle 232, a second spindle 242, a first balancer 25, and a second balancer 26. The tool 50, tool spindle 21, first spindle 232, second spindle 242, first balancer 25, and second balancer 26 are arranged coaxially with the rotation axis A.

[0033] Hereinafter, the direction along the rotation axis A of the tool head 20 will be referred to as "axial direction D". Furthermore, the side relative to the first spindle 232 of the tool 50 will be referred to as "one side of axial direction D", and the side relative to the second spindle 242 of the tool 50 will be referred to as "the other side of axial direction D". Additionally, the direction perpendicular to the rotation axis A of the tool head 20 will be referred to as "radial direction". Furthermore, the direction along the arc centered on the rotation axis A of the tool head 20 will be referred to as "circumferential direction".

[0034] like Figure 3 As shown, the tool head 20 of this embodiment includes a tool 50, a tool spindle 21, a mating flange 22, a first spindle unit 23, a second spindle unit 24, a first balancer 25, a second balancer 26, a first collection component 27, and a second collection component 28.

[0035] The tool mandrel 21 is a cylindrical component that holds the tool 50. The tool mandrel 21 extends axially in the direction of D along the rotation axis A of the tool head 20. The tool 50 is held on the outer surface of the tool mandrel 21. When the tool 50 is held by the tool mandrel 21, the tool axis X2 of the tool 50 overlaps with the rotation axis A of the tool head 20.

[0036] like Figure 3 As shown, the tool mandrel 21 of this embodiment has a small-diameter cylindrical portion 211, a first cylindrical portion 212, and a first enlarged-diameter portion 213. The small-diameter cylindrical portion 211 is cylindrical about the axis of rotation A and is smaller in diameter than the first cylindrical portion 212. The small-diameter cylindrical portion 211 is inserted radially inward into the tool 50. Thus, the tool 50 is held on the outer surface of the small-diameter cylindrical portion 211. However, the tool 50 can also be held on the outer surface of the small-diameter cylindrical portion 211 by other components.

[0037] The first cylindrical portion 212 is disposed on the side closer to the axial direction D than the smaller diameter cylindrical portion 211. The first cylindrical portion 212 is cylindrical about the axis of rotation A. The diameter of the first cylindrical portion 212 is larger than the diameter of the smaller diameter cylindrical portion 211. More specifically, the outer diameter of the first cylindrical portion 212 is larger than the outer diameter of the smaller diameter cylindrical portion 211. Furthermore, the inner diameter of the first cylindrical portion 212 is larger than the inner diameter of the smaller diameter cylindrical portion 211.

[0038] One end of tool 50 on one side of axial direction D contacts the first enlarged diameter portion 213. Furthermore, the other end of tool 50 on the other side of axial direction D contacts the nut 217 mounted on the small-diameter cylindrical portion 211. That is, tool 50 is clamped in axial direction D by the nut 217 and the first enlarged diameter portion 213. Thus, tool 50 is positioned in axial direction D.

[0039] The first enlarged diameter portion 213 is the part connecting the small-diameter cylindrical portion 211 and the first cylindrical portion 212. The first enlarged diameter portion 213 extends radially from the end of the small-diameter cylindrical portion 211 on one side of the axial direction D toward the end of the first cylindrical portion 212 on the other side of the axial direction D. The first enlarged diameter portion 213 is annular about the axis of rotation A.

[0040] Furthermore, the tool spindle 21 of this embodiment also has a first flange portion 214. The first flange portion 214 extends radially outward from the end of the first cylindrical portion 212 on the axial D side. The first flange portion 214 is fixed to the first assembly member 27, which will be described later.

[0041] One axial end of the tool spindle 21 is configured to accommodate at least a portion of the first balancer 25. In this embodiment, a portion of the first balancer 25 is accommodated radially inside the first cylindrical portion 212. However, the entire first balancer 25 may also be accommodated radially inside the first cylindrical portion 212. Furthermore, the shape of the tool spindle 21 used to accommodate at least a portion of the first balancer 25 radially inside may also be a polygonal cylindrical shape or other shapes.

[0042] The other axial end of the tool spindle 21 is configured to fix the mating flange 22. In this embodiment, the connecting portion 221 of the mating flange 22 (described later) is inserted into the inner side of the small-diameter cylindrical portion 211 of the tool spindle 21. Thus, the tool spindle 21 and the mating flange 22 are fixed coaxially. However, the structure of the tool spindle 21 used to fix the mating flange 22 can also be other. For example, the other axial end of the tool spindle 21 can be inserted into a hole provided in the mating flange 22. Furthermore, the other axial end of the tool spindle 21 can also be fixed to the mating flange 22 by bolts.

[0043] The tool 50 is held between one axial end and the other axial end of the tool mandrel 21 on the outer peripheral surface 211a of the small-diameter cylindrical portion 211. In this embodiment, the small-diameter cylindrical portion 211 of the tool 50 is cylindrical, i.e. hollow. In this way, the mass of the tool mandrel 21 can be reduced compared to the case where the part of the tool 50 is solid.

[0044] The mating flange 22 is a component that connects to the tool spindle 21 on the opposite side of the tool 50, axially D. For example... Figure 3 As shown, the mating flange 22 has a connecting portion 221, a second cylindrical portion 222, and a second enlarged diameter portion 223.

[0045] The connecting part 221 is inserted radially inward into the tool spindle 21. The connecting part 221 has a support mechanism that supports the tool spindle 21. The support mechanism supports the small-diameter cylindrical part 211 of the tool spindle 21 from the inside. As a result, the mating flange 22 can be fixed to the tool spindle 21 with high precision. For example, a hydraulic mandrel can be used as the support mechanism. However, other mechanisms such as an expansion collet can also be used as the support mechanism.

[0046] The second cylindrical portion 222 is disposed on the opposite side of the connecting portion 221 towards the axial direction D. The second cylindrical portion 222 is cylindrical about the axis of rotation A. The diameter of the second cylindrical portion 222 is larger than the diameter of the connecting portion 221. More specifically, the outer diameter and inner diameter of the second cylindrical portion 222 are larger than the outer diameter of the connecting portion 221.

[0047] The second enlarged diameter portion 223 is the part that connects the connecting portion 221 and the second cylindrical portion 222. The second enlarged diameter portion 223 extends radially from the end of the connecting portion 221 on the other side of the axial direction D toward the end of the second cylindrical portion 222 on the axial direction D side. The second enlarged diameter portion 223 is annular about the axis of rotation A.

[0048] Furthermore, the mating flange 22 of this embodiment also has a second flange portion 224. The second flange portion 224 extends radially outward from the end on the other side of the axial direction D of the second cylindrical portion 222. The second flange portion 224 is fixed to the second assembly member 28, which will be described later.

[0049] The mating flange 22 is configured to accommodate at least a portion of the second balancer 26 radially inward. In this embodiment, a portion of the second balancer 26 is accommodated radially inward of the second cylindrical portion 222. However, the entire second balancer 26 may also be accommodated radially inward of the second cylindrical portion 222. Furthermore, the shape of the mating flange 22 for accommodating at least a portion of the second balancer 26 radially inward may also be other shapes such as a polygonal cylindrical shape.

[0050] The first spindle unit 23 is positioned on the side axially D closer to the tool 50. For example... Figure 3 As shown, the first spindle unit 23 has a first housing 231, a first spindle 232, a first bearing 233, and a motor 234. The first spindle 232, the first bearing 233, and the motor 234 are housed inside the first housing 231.

[0051] The first spindle 232 is a shaft extending axially along the rotation axis A in the axial direction D. The first spindle 232 is supported by the first housing 231 via the first bearing 233. The motor 234 is electrically connected to the control unit 40. The motor 234 rotates the first spindle 232 based on the drive current supplied from the control unit 40. The first spindle 232 rotates about the rotation axis A.

[0052] The first spindle 232 is connected to the tool spindle 21 via the first assembly member 27, which will be described later. Thus, the first spindle 232 supports the unit containing the tool spindle 21 so that it can rotate. When the first spindle 232 rotates via the motor 234, the first assembly member 27 and the tool spindle 21 also rotate about the rotation axis A.

[0053] The second spindle unit 24 is positioned on the opposite side of the tool 50 along the axis D. For example... Figure 3 As shown, the second spindle unit 24 has a second housing 241, a second spindle 242, and a second bearing 243. The second spindle 242 and the second bearing 243 are housed inside the second housing 241.

[0054] The second main shaft 242 is a shaft extending axially along the rotation axis A in the axial direction D. The second main shaft 242 is supported by the second housing 241 via the second bearing 243. Thus, the second main shaft 242 can rotate about the rotation axis A.

[0055] The second spindle 242 is connected to the mating flange 22 via the second assembly member 28, described later. Thus, the second spindle 242 supports the unit containing the tool spindle 21 so that it can rotate. When the tool spindle 21 is rotated by the motor 234, the mating flange 22, the second assembly member 28, and the second spindle 242 also rotate about the rotation axis A.

[0056] In the tool head 20 of this embodiment, the tool 50 is supported by a first spindle 232 disposed on one side of axis D and a second spindle 242 disposed on the other side of axis D. This dual-support structure enables the tool 50 to rotate with high precision.

[0057] The first balancer 25 is a mechanism that corrects the mass balance centered on the rotation axis A, located on the side closer to axial D than the tool 50. For example... Figure 3 As shown, the first balancer 25 has a solid shaft 251 and one or more counterweights 252. The solid shaft 251 extends along the axis of rotation A in the axial direction D. The counterweights 252 are disposed on the outer surface of the solid shaft 251. Alternatively, the first balancer 25 may have a structure other than the combination of the solid shaft 251 and the counterweights 252.

[0058] The tool head 20 has a vibration sensor 236. The vibration sensor 236 detects the mass deviation of the rotating body including the tool 50 centered on the axis of rotation A. The first balancer 25 adjusts the circumferential position of the counterweight 252 on the outer surface of the solid shaft 251 based on the detection result of the vibration sensor 236. Thus, the first balancer 25 corrects at least one of the static balance and dynamic balance of the rotating body including the tool 50.

[0059] The second balancer 26 is a mechanism that corrects the mass balance centered on the rotation axis A, located on the opposite side of tool 50 along the axial direction D. For example... Figure 3 As shown, the second balancer 26 has a solid shaft 261 and one or more counterweights 262. The solid shaft 261 extends axially along the axis of rotation A in the direction of axial direction D. The counterweights 262 are disposed on the outer surface of the solid shaft 261. Alternatively, the second balancer 26 may have a structure other than the combination of the solid shaft 261 and the counterweights 262.

[0060] The second balancer 26 adjusts the circumferential position of the counterweight 262 on the outer surface of the solid shaft 261 based on the detection results of the vibration sensor 236. Thus, the second balancer 26 corrects at least one of the static and dynamic balance of the rotating body including the tool 50.

[0061] exist Figure 3 and Figure 4 In the example, vibration sensor 236 is disposed on the outer peripheral surface of the first housing 231. However, the tool head 20 may also have more than two vibration sensors 236. In this case, a second vibration sensor 236 may be disposed on the outer periphery of the second housing 241.

[0062] When both ends of tool 50 are supported, the rotating body is prone to multiple mass imbalances, and imbalances due to couples may occur. In this embodiment, it is also possible to perform two-sided dynamic balancing correction based on the synchronous control of the first balancer 25 and the second balancer 26.

[0063] Tool 50 wears down due to machining workpiece 9. Wear is particularly significant when tool 50 is a grinding stone. However, in this machine tool 1, changes in mass balance caused by tool 50 wear can be corrected by the first balancer 25 and the second balancer 26. Therefore, it is possible to suppress the wobbling of the worn tool 50 due to eccentricity. Furthermore, when tool 50 is replaced, changes in mass balance can also be adjusted by the first balancer 25 and the second balancer 26.

[0064] The first gathering member 27 is a component that maintains the wire connected to the first balancer 25. The first gathering member 27 is disposed on one side of the tool spindle 21 along the axial direction D. The first gathering member 27 is fixed to the end of the tool spindle 21 on the axial direction D side by bolts. In addition, the first gathering member 27 is fixed to the end of the first spindle 232 on the other side of the axial direction D by bolts.

[0065] The second gathering member 28 is a component that holds the wire connected to the second balancer 26. The second gathering member 28 is disposed on the other side of the mating flange 22 along the axial direction D. The second gathering member 28 is fixed to the end of the mating flange 22 on the other side of the axial direction D by bolts. Additionally, the second gathering member 28 is fixed to the end of the second spindle 242 on the axial direction D by bolts.

[0066] <3. About the First Balancer>

[0067] The first balancer 25 described above will now be described in more detail. Figure 4 This is a partial longitudinal sectional view of the tool head 20 near the first balancer 25.

[0068] like Figure 4As shown, the first balancer 25 is disposed between the tool spindle 21 and the first assembly member 27. More specifically, the first balancer 25 is housed in the space formed between the tool spindle 21 and the first assembly member 27, which are connected to each other. At least a portion of the first balancer 25 is disposed axially D between the tool 50 and the first spindle 232.

[0069] The first balancer 25 is fixed to the first assembly member 27 by bolts 253. Therefore, the first balancer 25 rotates together with the tool spindle 21 and the first assembly member 27. However, the first balancer 25 can also be fixed to the tool spindle 21 by bolts.

[0070] At least a portion of the first balancer 25 is disposed radially inward from the radially inner end of the tool 50. That is, at least a portion of the first balancer 25 is disposed radially inward from the outer circumferential surface 211a of the small-diameter cylindrical portion 211 holding the tool 50 on the tool spindle 21. Therefore, the mass of the first balancer 25 can be distributed near the axis of rotation A. In other words, in this embodiment, the first balancer 25 is not configured as a cylinder with a diameter larger than the inner diameter of the tool 50, but rather at least a portion of its mass is distributed radially inward from the radially inner end of the tool 50. This reduces the moment of inertia of the first balancer 25. Therefore, it is easier to rotate the tool 50 at high speed.

[0071] Furthermore, in this embodiment, the radially outer end 25E of the first balancer 25 is positioned radially inward than the radially outer end of the tool 50. That is, the inner surface of the first cylindrical portion 212 of the first balancer 25 is positioned radially inward than the radially outer end of the tool 50. This reduces the moment of inertia of the first balancer 25 by suppressing its outer diameter. Consequently, it is easier to rotate the tool 50 at high speed.

[0072] The outer radial end 25E of the first balancer 25 can also be positioned radially inward than the inner radial end of the tool 50. In other words, the entire first balancer 25 can be positioned radially inward than the inner radial end of the tool 50. This concentrates the mass of the first balancer 25 closer to the axis of rotation A, resulting in a smaller moment of inertia for the first balancer 25. Consequently, it is easier to make the tool 50 rotate at high speed.

[0073] Furthermore, in this embodiment, the first balancer 25 has a solid cylindrical shaft 251 instead of a hollow cylindrical shaft. This allows the mass distribution of the first balancer 25 to be closer to the axis of rotation A. Consequently, the moment of inertia of the first balancer 25 can be further reduced. As a result, it is easier to rotate the tool 50 at high speed.

[0074] At least a portion of the solid shaft 251 is positioned radially inward from the radially inner end of the tool 50. This further reduces the moment of inertia of the first balancer 25. Consequently, it becomes easier to rotate the tool 50 at high speeds.

[0075] Furthermore, in this embodiment, a portion of the first balancer 25 is disposed radially inward of the first cylindrical portion 212 of the tool spindle 21. That is, at least a portion of the first balancer 25 is disposed radially inward of the tool spindle 21. As a result, the mass of at least a portion of the first balancer 25 is distributed radially inward of the tool spindle 21. This further reduces the moment of inertia of the first balancer 25. Consequently, it is easier to rotate the tool 50 at high speed.

[0076] The outer surface of the first balancer 25 contacts the inner surface of the first cylindrical portion 212. This positions the first balancer 25 radially. The end face of the first balancer 25 on the other side of the axial direction D is slightly spaced from the first enlarged diameter portion 213 of the tool spindle 21 in the axial direction D. However, the end face of the first balancer 25 on the other side of the axial direction D can also contact the first enlarged diameter portion 213 of the tool spindle 21 in the axial direction D. In other words, the first balancer 25 can contact the first enlarged diameter portion 213 in the axial direction D. Thus, the first balancer 25 can be positioned axially D using the first enlarged diameter portion 213.

[0077] like Figure 4 As shown in the enlarged view, the tool mandrel 21 has a first conical surface 215. The first conical surface 215 is inclined relative to the axial direction D and the radial direction. In this embodiment, the first conical surface 215 is a conical surface centered on the rotation axis A. The first gathering member 27 contacts the first conical surface 215. As a result, the first gathering member 27 can be positioned with high precision relative to the tool mandrel 21 in the axial direction D and the radial direction.

[0078] The first balancer 25 is disposed in a space formed by precisely positioning the tool spindle 21 and the first assembly member 27 using the first conical surface 215. Thus, the first balancer 25 can also be precisely positioned in the axial direction D and the radial direction. Furthermore, the first balancer 25 can be precisely coaxially positioned relative to the rotation axis A.

[0079] The tool head 20 of this embodiment includes a first housing 231 for receiving a first spindle 232. Furthermore, the radially outer end 25E of the first balancer 25 is positioned radially inward than the radially outer end of the first housing 231. Thus, by suppressing the outer diameter of the first balancer 25, the moment of inertia of the first balancer 25 can be further reduced. Therefore, it is easier to make the tool 50 rotate at high speed.

[0080] At least a portion of the first balancer 25 can be disposed radially inward of the first housing 231. In this way, the mass of at least a portion of the first balancer 25 is distributed radially inward of the first housing 231. This further reduces the moment of inertia of the first balancer 25. As a result, it is easier to rotate the tool 50 at high speed. Furthermore, the position of the first balancer 25 in the axial direction D at least partially overlaps with the position of the first housing 231 in the axial direction D. Therefore, the length of the tool head 20 in the axial direction D can be reduced.

[0081] The tool head 20 of this embodiment includes a first bearing 233 supporting a first spindle 232. Furthermore, the radially outer end 25E of the first balancer 25 is positioned further radially inward than the radially inner end near the first bearing 233. Thus, by suppressing the outer diameter of the first balancer 25, the moment of inertia of the first balancer 25 can be further reduced. Therefore, it is easier to make the tool 50 rotate at high speed.

[0082] <4. About the Second Balancer>

[0083] Next, the second balancer 26 will be described in more detail. Figure 5 This is a partial longitudinal section view of the tool head 20 near the second balancer 26.

[0084] like Figure 5 As shown, the second balancer 26 is disposed between the mating flange 22 and the second assembly member 28. More specifically, the second balancer 26 is housed in the space formed between the mating flange 22 and the second assembly member 28 by connecting the mating flange 22 and the second assembly member 28 to each other. At least a portion of the second balancer 26 is disposed axially D between the tool 50 and the second spindle 242.

[0085] The second balancer 26 is fixed to the second assembly member 28 by bolts 263. Therefore, the second balancer 26 rotates together with the mating flange 22 and the second assembly member 28. However, the second balancer 26 can also be fixed to the mating flange 22 by bolts.

[0086] At least a portion of the second balancer 26 is positioned radially inward from the radially inner end of the tool 50. This allows the mass of the second balancer 26 to be distributed near the axis of rotation A. That is, in this embodiment, the second balancer 26 is not configured as a cylinder with a diameter larger than the inner diameter of the tool 50, but rather at least a portion of its mass is distributed radially inward from the radially inner end of the tool 50. This reduces the moment of inertia of the second balancer 26. Therefore, it is easier to rotate the tool 50 at high speed.

[0087] Furthermore, in this embodiment, the radially outer end 26E of the second balancer 26 is positioned radially inward than the radially outer end of the tool 50. This reduces the moment of inertia of the second balancer 26 by suppressing its outer diameter. Consequently, it is easier to rotate the tool 50 at high speed.

[0088] The outer radial end 26E of the second balancer 26 can be positioned radially inward than the inner radial end of the tool 50. In other words, the entire second balancer 26 can be positioned radially inward than the inner radial end of the tool 50. This concentrates the mass of the second balancer 26 closer to the axis of rotation A, further reducing the moment of inertia of the second balancer 26. Consequently, it is easier to make the tool 50 rotate at high speed.

[0089] Furthermore, in this embodiment, the second balancer 26 has a cylindrical solid shaft 261 instead of a cylindrical hollow shaft. This allows the mass distribution of the second balancer 26 to be closer to the axis of rotation A. Therefore, the moment of inertia of the second balancer 26 can be further reduced. As a result, it is easier to make the tool 50 rotate at high speed.

[0090] The solid shaft 261 is positioned radially inward from the innermost radial end of the tool 50. This further reduces the moment of inertia of the second balancer 26. As a result, it is easier to rotate the tool 50 at high speeds.

[0091] Furthermore, in this embodiment, a portion of the second balancer 26 is disposed radially inward of the second cylindrical portion 222 of the mating flange 22. That is, at least a portion of the second balancer 26 is disposed radially inward of the mating flange 22. This distributes the mass of at least a portion of the second balancer 26 radially inward of the mating flange 22. Consequently, the moment of inertia of the second balancer 26 can be further reduced. As a result, it is easier to rotate the tool 50 at high speed.

[0092] The outer surface of the second balancer 26 contacts the inner surface of the second cylindrical portion 222. This allows the second balancer 26 to be positioned radially. The end face of the second balancer 26 on the axial D side faces the second expanded diameter portion 223 of the mating flange 22 at a slight distance in the axial D direction. However, the end face of the second balancer 26 on the axial D side can also contact the second expanded diameter portion 223 of the mating flange 22 in the axial D direction. In other words, the second balancer 26 can also contact the second expanded diameter portion 223 in the axial D direction. This allows the second balancer 26 to be positioned axially by the second expanded diameter portion 223.

[0093] like Figure 5As shown in the enlarged view, the mating flange 22 has a second conical surface 225. The second conical surface 225 is inclined relative to the axial direction D and the radial direction. In this embodiment, the second conical surface 225 is a conical surface centered on the axis of rotation A. The second assembly member 28 contacts the second conical surface 225. As a result, the second assembly member 28 can be positioned with high precision relative to the mating flange 22 in the axial direction D and the radial direction.

[0094] The second balancer 26 is disposed in a space formed by precisely positioning the mating flange 22 and the second assembly member 28 using the second conical surface 225. This allows the second balancer 26 to be precisely positioned in both the axial direction (D) and the radial direction. Furthermore, the second balancer 26 can be precisely positioned coaxially with the rotation axis A.

[0095] The tool head 20 of this embodiment includes a second housing 241 that houses the second spindle 242. Furthermore, the radially outer end 26E of the second balancer 26 is positioned radially inward than the radially outer end of the second housing 241. Thus, by suppressing the outer diameter of the second balancer 26, the moment of inertia of the second balancer 26 can be further reduced. Therefore, it is easier to rotate the tool 50 at high speed.

[0096] At least a portion of the second balancer 26 can be disposed radially inward of the second housing 241. In this way, the mass of at least a portion of the second balancer 26 is distributed radially inward of the second housing 241. This further reduces the moment of inertia of the second balancer 26. As a result, it is easier to rotate the tool 50 at high speed. Furthermore, the position of the second balancer 26 in the axial direction D at least partially overlaps with the position of the second housing 241 in the axial direction D. This reduces the length of the tool head 20 in the axial direction D.

[0097] The tool head 20 of this embodiment includes a second bearing 243 that supports the second spindle 242. Furthermore, the radially outer end 26E of the second balancer 26 is positioned radially inward than the radially inner end of the second bearing 243. This reduces the moment of inertia of the second balancer 26 by suppressing its outer diameter. Consequently, it is easier to rotate the tool 50 at high speed.

[0098] The machine tool 1 of this embodiment includes the tool head 20 described above, thus enabling the tool 50 to rotate at high speed. Therefore, the tool 50 can slide against the workpiece 9 at high speed. Especially when machining workpieces 9 with steps, such as two-stage gears, it is difficult to increase the diameter of the tool 50, thus requiring the small-diameter tool 50 to rotate at high speed. In this situation, the tool head 20 of this embodiment is particularly useful.

[0099] <5. Variations>

[0100] The above describes one embodiment of the present invention, but the present invention is not limited to the above embodiment.

[0101] <5-1. First Variation>

[0102] Figure 6 This is a longitudinal sectional view of the tool head 20 in the first modified example. Figure 6 In the example, the first spindle 232 has a first flow path 235 extending along the axial direction D. Specifically, a hole serving as the first flow path 235 is formed inside the first spindle 232. The machine tool 1 allows coolant to flow through the first flow path 235. This allows cooling of the first spindle 232 and the first bearing 233. Therefore, the first spindle 232 can rotate at high speed, and the high temperature of the first spindle 232 and the first bearing 233 can be suppressed.

[0103] The first balancer 25 is positioned differently along the axial direction D from the first spindle 232. Specifically, one end of the first balancer 25 along the axial direction D is positioned further away from the other end of the axial direction D than the other end of the first spindle 232. Therefore, as Figure 6 As shown, a first flow path 235 can be formed in the first spindle 232. Therefore, by allowing coolant to flow through the first flow path 235, the first spindle 232 and the first bearing 233 can be cooled. As a result, it is easier to make the tool 50 rotate at high speed. In addition, thermal expansion generated in the axial direction D can be reduced.

[0104] In addition, Figure 6 In the example, the second spindle 242 has a second flow path 245 extending along the axial direction D. Specifically, a hole serving as the second flow path 245 is formed inside the second spindle 242. The machine tool 1 allows coolant to flow through the second flow path 245. As a result, the second spindle 242 and the second bearing 243 can be cooled. Therefore, the second spindle 242 can be rotated at high speed, and the high temperature of the second spindle 242 and the second bearing 243 can be suppressed.

[0105] The second balancer 26 is positioned differently along the axial direction D from the second main shaft 242. Specifically, the other end of the second balancer 26 along the axial direction D is positioned further along the axial direction D than the end of the second main shaft 242 along the axial direction D. Therefore, as Figure 6 As shown, a second flow path 245 can be formed on the second spindle 242. Therefore, by allowing coolant to flow through the second flow path 245, the second spindle 242 and the second bearing 243 can be cooled. As a result, it is easier to make the tool 50 rotate at high speed. In addition, thermal expansion generated in the axial direction D can be reduced.

[0106] according to Figure 6The structure reduces the thermal expansion along the axial direction D between the first spindle 232 and the second spindle 242, thus reducing the change in coaxiality between the first spindle 232 and the second spindle 242. Therefore, it can suppress the decrease in the rotational accuracy of the tool 50.

[0107] In addition, Figure 6 In the example, the other end of the second balancer 26 along the axial direction D is positioned on the opposite side of the second housing 241 along the axial direction D. That is, at least a portion of the second balancer 26 overlaps with the second housing 241 along the axial direction D. This allows for a reduction in the length of the tool head 20 along the axial direction D.

[0108] <5-2. Second Variation>

[0109] Figure 7 This is a longitudinal sectional view of the tool head 20 in the second modified example. Figure 7 In the example, the radially outer end 25E of the first balancer 25 is positioned radially inward than the radially outer end of the first spindle 232. Thus, by suppressing the outer diameter of the first balancer 25, the moment of inertia of the first balancer 25 can be further reduced. Therefore, it is easier to make the tool 50 rotate at high speed.

[0110] However, in Figure 7 In the example, the radially outer end 25E of the first balancer 25 is positioned radially outward than the radially inner end of the tool 50. Therefore, even when the radial dimension of the tool 50 is small, the radial dimension of the first balancer 25 can be sufficiently large. Thus, the mass balance and rotational balance of the tool head 20 can be easily corrected using the first balancer 25.

[0111] In addition, Figure 7 In the example, the radially outer end 26E of the second balancer 26 is positioned radially inward than the radially outer end of the second spindle 242. Thus, by suppressing the outer diameter of the second balancer 26, the moment of inertia of the second balancer 26 can be further reduced. Therefore, it is easier to make the tool 50 rotate at high speed.

[0112] However, in Figure 7 In the example, the radially outer end 26E of the second balancer 26 is positioned radially outward than the radially inner end of the tool 50. Therefore, even if the radial dimension of the tool 50 is small, the radial dimension of the second balancer 26 can be sufficiently large. Thus, the mass balance and rotational balance of the tool head 20 can be easily corrected using the second balancer 26.

[0113] In addition, Figure 7In this example, the tool mandrel 21 has a solid cylindrical portion 216 instead of the small-diameter cylindrical portion 211 as described in the above embodiment. The cylindrical portion 216 is cylindrical about the axis of rotation A. The cylindrical portion 216 is inserted radially inward of the tool 50. Thus, the tool 50 is held on the outer surface of the cylindrical portion 216. Therefore, by making the portion of the tool mandrel 21 that holds the tool 50 solid, the outer diameter of this portion can be reduced compared to a hollow case. Therefore, tools with smaller diameters can be accommodated.

[0114] <5-3. Third Variation>

[0115] Figure 8 and Figure 9 This is a longitudinal sectional view of the tool 50, tool mandrel 21, mating flange 22, first balancer 25, and second balancer 26 in the third variation. In the above embodiment, the first balancer 25 is fixed to the first assembly member 27. In contrast, in... Figure 8 and Figure 9 In the example, the first balancer 25 is fixed to the tool spindle 21. Specifically, the first balancer 25 is fixed to one axial end of the tool spindle 21 by bolts 253.

[0116] Furthermore, in the above embodiment, the second balancer 26 is fixed to the second collecting member 28. In contrast, in... Figure 8 and Figure 9 In the example, the second balancer 26 is fixed to the mating flange 22, which is fixed to the other axial end of the tool spindle 21. Specifically, the second balancer 26 is fixed to the mating flange 22 by bolts 263.

[0117] In this way, the tool 50, tool spindle 21, mating flange 22, first balancer 25, and second balancer 26 can be integrated into a single tool unit 60. Therefore, the tool unit 60 can be pre-balanced using the first balancer 25 and second balancer 26 before being installed on the spindle. This allows for quick balancing adjustments after installation on the spindle using the first balancer 25 and second balancer 26.

[0118] In addition, Figure 8 and Figure 9In the third variation, the first balancer 25 and the second balancer 26 can be integrated with the tool unit 60, and these first balancers 25 and second balancers 26 can also be replaced. Therefore, the dimensions of the first balancers 25 and second balancers 26 can be changed to match the size of the tool 50. For example, when using a tool 50 with a small radial dimension, the first balancers 25 and second balancers 26 with a smaller radial dimension can be replaced accordingly. This allows the first balancers 25 and second balancers 26 to rotate at high speed.

[0119] <5-4. Other variations>

[0120] In the above embodiments, a whetstone was used as an example of tool 50. However, the term "tool" in this invention is not limited to a whetstone for grinding, but may also include cutting tools or the like.

[0121] Furthermore, the elements appearing in the above-described embodiments and variations can be appropriately combined within the scope of not causing contradictions.

[0122] <6. Summary>

[0123] This technology can have the following structure.

[0124] (1) A tool head comprising: a cylindrical tool spindle extending axially along a rotation axis; a cylindrical tool held on the outer side of the tool spindle; a first spindle supporting a unit including the tool spindle for rotatability at an axial side relative to the tool; a second spindle supporting a unit including the tool spindle for rotatability at an axial side relative to the tool; a first balancer correcting mass balance centered on the rotation axis at an axial side relative to the tool; and a second balancer correcting mass balance centered on the rotation axis at an axial side relative to the tool, wherein the tool spindle, the tool, the first spindle, the second spindle, the first balancer, and the second balancer are coaxially arranged with respect to the rotation axis, at least a portion of the first balancer is axially arranged between the tool and the first spindle, at least a portion of the second balancer is axially arranged between the tool and the second spindle, and at least a portion of the first balancer is arranged radially inward relative to the radially inner end of the tool.

[0125] (2) The tool head according to (1), wherein the radial outer end of the first balancer is disposed radially inward than the radial outer end of the tool.

[0126] (3) The tool head according to (1), wherein at least a portion of the second balancer is disposed radially inward from the radially inner end of the tool.

[0127] (4) The tool head according to (3), wherein the radial outer end of the second balancer is disposed radially inward than the radial outer end of the tool.

[0128] (5) The tool head according to any one of (1) to (4), wherein the first balancer and the second balancer have: a solid shaft extending axially; and one or more counterweights disposed on the outer side of the solid shaft.

[0129] (6) The tool head according to any one of (1) to (5), wherein at least a portion of the first balancer is disposed radially inward of the tool mandrel.

[0130] (7) The tool head according to (6), wherein the tool spindle has: a small-diameter cylindrical portion inserted radially inward of the tool; a first cylindrical portion disposed on an axial side relative to the small-diameter cylindrical portion and having a diameter greater than that of the small-diameter cylindrical portion; and a first enlarged portion connecting the small-diameter cylindrical portion and the first cylindrical portion, wherein the outer surface of the first balancer contacts the inner surface of the first cylindrical portion, and the first balancer contacts or is opposite to the first enlarged portion axially.

[0131] (8) The tool head according to (7), further comprising a first gathering member disposed on one axial side of the tool mandrel and holding a wire connected to the first balancer, the tool mandrel having a first conical surface inclined relative to the axial and radial directions, the first gathering member being in contact with the first conical surface.

[0132] (9) The tool head according to any one of (1) to (8), wherein it further comprises a mating flange connected to the tool spindle on the axial side of the tool, and at least a portion of the second balancer is disposed radially inside the mating flange.

[0133] (10) The tool head according to (9), wherein the mating flange has: a connecting portion inserted into the radially inner side of the tool spindle; a second cylindrical portion disposed on the axial side of the connecting portion and having a diameter larger than that of the connecting portion; and a second enlarged diameter portion connecting the connecting portion and the second cylindrical portion, wherein the outer side of the second balancer contacts the inner side of the second cylindrical portion, and the second balancer contacts or is opposite to the second enlarged diameter portion axially.

[0134] (11) The tool head according to (10), further comprising a second gathering member disposed on the other side of the axial direction of the mating flange and holding a wire connected to the second balancer, the mating flange having a second conical surface inclined relative to the axial and radial directions, the second gathering member being in contact with the second conical surface.

[0135] (12) The tool head according to (10) or (11), wherein the connecting part has a support mechanism for supporting the tool spindle.

[0136] (13) The tool head according to any one of (1) to (12), wherein the first spindle has a first flow path extending axially.

[0137] (14) The tool head according to any one of (1) to (13), wherein the second spindle has a second flow path extending axially.

[0138] (15) The tool head according to any one of (1) to (14), wherein it further comprises a first housing for receiving the first spindle, wherein the radially outer end of the first balancer is disposed radially inward than the radially outer end of the first housing.

[0139] (16) The tool head according to (15), wherein at least a portion of the first balancer is disposed radially inward of the first housing.

[0140] (17) The tool head according to any one of (1) to (16), wherein it further comprises a second housing for receiving the second spindle, wherein the radially outer end of the second balancer is disposed radially inward than the radially outer end of the second housing.

[0141] (18) The tool head according to (17), wherein at least a portion of the second balancer is disposed radially inward of the second housing.

[0142] (19) The tool head according to any one of (1) to (18), wherein it further comprises a first bearing supporting the first spindle, and the radially outer end of the first balancer is disposed radially inward than the radially inner end of the first bearing.

[0143] (20) The tool head according to any one of (1) to (19), wherein it further comprises a second bearing supporting the second spindle, and the radially outer end of the second balancer is disposed radially inward than the radially inner end of the second bearing.

[0144] (21) The tool head according to any one of (1) to (20), wherein the tool is a grinding stone.

[0145] (22) A machine tool comprising a tool head as described in any one of (1) to (21).

[0146] (23) A tool spindle formed extending along a rotation axis and holding a cylindrical tool on its outer peripheral surface, wherein one axial end of the tool spindle is configured to receive at least a portion of a first balancer radially inward, and the other axial end of the tool spindle is configured to allow a mating flange to be fixed coaxially with the tool spindle, the mating flange being able to receive at least a portion of a second balancer radially inward, the tool being held between the one axial end and the other axial end, and at least a portion of the first balancer being disposed radially inward beyond the outer peripheral surface.

[0147] (24) The tool spindle according to (23), wherein a first cylindrical portion is provided at one axial end to hold the first balancer on an inner side, the inner side of the first cylindrical portion being disposed radially inward than the radially outer end of the tool.

[0148] (25) The tool mandrel according to (23) has: a small-diameter cylindrical portion inserted radially inside the tool; a first cylindrical portion disposed on an axial side relative to the small-diameter cylindrical portion and having a diameter greater than that of the small-diameter cylindrical portion; and a first enlarged portion connecting the small-diameter cylindrical portion and the first cylindrical portion, wherein the outer surface of the first balancer contacts the inner surface of the first cylindrical portion, and the first balancer contacts or is opposite to the first enlarged portion axially.

[0149] (26) The tool mandrel according to (23) wherein it has a solid columnar portion inserted radially inward into the tool.

[0150] (27) The tool mandrel according to (23) wherein it has a hollow, small-diameter cylindrical portion inserted radially inward into the tool.

[0151] (28) A tool mandrel according to any one of (23) to (27), wherein the tool is a grinding stone.

[0152] (29) A tool unit comprising: a tool spindle as described in any one of (23) to (28); a first balancer fixed to one end of the axial direction; a mating flange fixed to the other end of the axial direction; a second balancer fixed to the mating flange; and the tool held on the outer peripheral surface.

[0153] Industrial availability

[0154] This invention can be applied to tool heads and machine tools.

[0155] [Symbol Explanation]

[0156] 1: Machine tools

[0157] 9: Workpiece

[0158] 10: Workpiece Rotation Mechanism

[0159] 20: Tool head

[0160] 21: Tool spindle

[0161] 22: Matching flange

[0162] 23: First spindle unit

[0163] 24: Second spindle unit

[0164] 25: First Balancer

[0165] 25E: Radial outer end of the first balancer

[0166] 26: Second Balancer

[0167] 26E: Radial outer end of the second balancer

[0168] 27: First assembly component

[0169] 28: Second collection component

[0170] 30: Mobile mechanism

[0171] 31: First moving mechanism

[0172] 32: Second moving mechanism

[0173] 33: Third moving mechanism

[0174] 40: Control Unit

[0175] 50: Tools

[0176] 51: slot

[0177] 60: Tool Unit

[0178] 90: Base

[0179] 91: Teeth

[0180] 211: Small diameter cylindrical part

[0181] 211a: outer peripheral surface

[0182] 212: First cylindrical part

[0183] 213: First enlarged diameter section

[0184] 214: First flange section

[0185] 215: First conical surface

[0186] 216: Columnar portion

[0187] 221: Connecting part

[0188] 222: Second cylindrical part

[0189] 223: Second diameter expansion section

[0190] 224: Second flange section

[0191] 225: Second cone surface

[0192] 231: First Shell

[0193] 232: First main axis

[0194] 233: First bearing

[0195] 234: Motor

[0196] 235: First flow path

[0197] 236: Vibration sensor

[0198] 241: Second shell

[0199] 242: Second Main Axis

[0200] 243: Second bearing

[0201] 245: Second Flow Path

[0202] 251: Solid shaft of the first balancer

[0203] 252: The counterweight of the first balancer

[0204] 261: Solid shaft of the second balancer

[0205] 262: The counterweight of the second balancer

[0206] A: Axis of rotation

[0207] D: Axial direction

[0208] X1: Workpiece axis

[0209] X2: Tool axis.

Claims

1. A tool head, comprising: A cylindrical tool mandrel that extends axially along a rotation axis; A cylindrical tool, the tool being held on the outer side of the tool mandrel; A first spindle supports a unit including the tool spindle for rotation at a position axially closer to the tool; The second spindle supports the unit including the tool spindle for rotation at a position on the opposite side of the axis from the tool. A first balancer corrects the mass balance centered on the axis of rotation at a position axially closer to the tool; as well as A second balancer corrects the mass balance centered on the axis of rotation at a location on the opposite side of the axis of rotation from the tool. Its features are, The tool spindle, the tool, the first spindle, the second spindle, the first balancer, and the second balancer are coaxially arranged with the axis of rotation. At least a portion of the first balancer is axially positioned between the tool and the first spindle. At least a portion of the second balancer is axially disposed between the tool and the second spindle. At least a portion of the first balancer is positioned radially inward from the radially inner end of the tool.

2. The tool head according to claim 1, characterized in that, The radial outer end of the first balancer is positioned radially inward than the radial outer end of the tool.

3. The tool head according to claim 1, characterized in that, At least a portion of the second balancer is positioned radially inward from the radially inner end of the tool.

4. The tool head according to claim 3, characterized in that, The radial outer end of the second balancer is positioned radially inward than the radial outer end of the tool.

5. The tool head according to any one of claims 1 to 4, characterized in that, The first balancer and the second balancer have: A solid shaft extending axially; and One or more counterweights are disposed on the outer side of the solid shaft.

6. The tool head according to any one of claims 1 to 4, characterized in that, At least a portion of the first balancer is disposed radially inward of the tool mandrel.

7. The tool head according to claim 6, characterized in that, The tool mandrel has: A small-diameter cylindrical portion is inserted radially inward into the tool; A first cylindrical portion is disposed on the axial side of the smaller diameter cylindrical portion, and the diameter of the first cylindrical portion is larger than the diameter of the smaller diameter cylindrical portion. as well as The first diameter-enlarged section connects the small-diameter cylindrical section and the first cylindrical section. The outer surface of the first balancer contacts the inner surface of the first cylindrical portion. The first balancer is in contact with or opposite the first enlarged diameter portion along the axial direction.

8. The tool head according to claim 7, characterized in that, It also includes a first gathering member disposed on one axial side of the tool mandrel and holding the wire connected to the first balancer. The tool mandrel has a first conical surface that is inclined relative to the axial and radial directions. The first collecting component is in contact with the first conical surface.

9. The tool head according to any one of claims 1 to 4, characterized in that, It also includes a mating flange that connects to the tool spindle on the opposite side of the tool along its axial direction. At least a portion of the second balancer is disposed radially inside the mating flange.

10. The tool head according to claim 9, characterized in that, The mating flange has: A connecting part, which is inserted radially inward into the tool mandrel; The second cylindrical portion is disposed on the axial side opposite to the connecting portion, and the diameter of the second cylindrical portion is larger than the diameter of the connecting portion; as well as The second expanded diameter section connects the connecting section and the second cylindrical section. The outer surface of the second balancer contacts the inner surface of the second cylindrical portion. The second balancer is in contact with or opposite the second enlarged diameter portion along the axial direction.

11. The tool head according to claim 10, characterized in that, It also includes a second gathering member, which is disposed on the opposite axial side of the mating flange and holds the wire connected to the second balancer. The mating flange has a second conical surface that is inclined relative to the axial and radial directions. The second converging member is in contact with the second conical surface.

12. The tool head according to claim 10, characterized in that, The connecting part has a support mechanism that supports the tool spindle.

13. The tool head according to any one of claims 1 to 4, characterized in that, The first spindle has a first flow path extending axially.

14. The tool head according to any one of claims 1 to 4, characterized in that, The second spindle has a second flow path extending axially.

15. The tool head according to any one of claims 1 to 4, characterized in that, It also includes a first housing for housing the first spindle. The radial outer end of the first balancer is positioned radially inward than the radial outer end of the first housing.

16. The tool head according to claim 15, characterized in that, At least a portion of the first balancer is disposed radially inward of the first housing.

17. The tool head according to any one of claims 1 to 4, characterized in that, It also includes a second housing for housing the second spindle. The radial outer end of the second balancer is positioned radially inward than the radial outer end of the second housing.

18. The tool head according to claim 17, characterized in that, At least a portion of the second balancer is disposed radially inward of the second housing.

19. The tool head according to any one of claims 1 to 4, characterized in that, It also includes a first bearing that supports the first spindle. The outer radial end of the first balancer is positioned radially inward than the inner radial end of the first bearing.

20. The tool head according to any one of claims 1 to 4, characterized in that, It also includes a second bearing that supports the second spindle. The outer radial end of the second balancer is positioned radially inward than the inner radial end of the second bearing.

21. The tool head according to any one of claims 1 to 4, characterized in that, The tool in question is a whetstone.

22. A machine tool, characterized in that, Includes the tool head as described in any one of claims 1 to 4.

23. A tool mandrel, the tool mandrel being formed extending along a rotation axis and holding a cylindrical tool on its outer peripheral surface, characterized in that, One axial end of the tool spindle is configured to accommodate at least a portion of the first balancer radially inward. The other axial end of the tool mandrel is configured to allow a mating flange to be fixed coaxially with the tool mandrel, and the mating flange can accommodate at least a portion of the second balancer radially inward. The tool is held between one end of the axial direction and the other end of the axial direction. At least a portion of the first balancer is disposed radially inward from the outer peripheral surface.

24. The tool mandrel according to claim 23, characterized in that, At one axial end, there is a first cylindrical portion that holds the first balancer to the inner side. The inner surface of the first cylindrical portion is positioned radially inward from the radially outer end of the tool.

25. The tool mandrel according to claim 23, characterized in that, have: A small-diameter cylindrical portion is inserted radially inward into the tool; A first cylindrical portion is disposed on the axial side of the smaller diameter cylindrical portion, and the diameter of the first cylindrical portion is larger than the diameter of the smaller diameter cylindrical portion. as well as The first diameter-enlarged section connects the small-diameter cylindrical section and the first cylindrical section. The outer surface of the first balancer contacts the inner surface of the first cylindrical portion. The first balancer is in contact with or opposite the first enlarged diameter portion along the axial direction.

26. The tool mandrel according to claim 23, characterized in that, It has a solid columnar portion that is inserted radially inward into the tool.

27. The tool mandrel according to claim 23, characterized in that, It has a hollow, small-diameter cylindrical portion that is inserted radially inward into the tool.

28. The tool mandrel according to any one of claims 23 to 27, characterized in that, The tool in question is a whetstone.

29. A tool unit, characterized in that, include: Tool mandrel as claimed in any one of claims 23 to 27; The first balancer is fixed to one end of the axial direction; The mating flange is fixed to the other end of the axial direction; The second balancer fixed to the mating flange; and The tool is held on the outer peripheral surface.

Images