JP2024043733A - Vibration suppression device and turning device - Google Patents

Abstract

[Problem] To provide a vibration suppression device capable of suppressing vibration of a workpiece. [Solution] The vibration suppression device 18 is used in a turning machine 10 including a headstock 12 that grips one end of a workpiece W extending along an axis and rotates the workpiece W about the axis, and a tailstock 14 that supports the other end of the workpiece W and has a revolving center 24 that rotates together with the workpiece W, and includes a plurality of first magnets 40 that are aligned in a circumferential direction about the rotation axis O of the workpiece W and have their respective N poles and S poles aligned in a radial direction about the rotation axis O, and a plurality of second magnets 44 that are aligned in a circumferential direction and have their respective N poles and S poles aligned in a radial direction and are provided radially outward of the plurality of first magnets 40, and one of the plurality of first magnets 40 and the plurality of second magnets 44 rotates together with the workpiece W relative to the other. [Selected Figure] Figure 4

Description

The present invention relates to a vibration suppression device and a turning device.

2. Description of the Related Art Turning devices that rotate and cut or polish a workpiece are conventionally known. For example, Patent Document 1 discloses a spindle device that grips one end of a rod-shaped workpiece and rotates the workpiece, a tailstock that supports the other end of the workpiece and rotates together with the workpiece, and a tailstock that rotates the workpiece by gripping one end of the rod-shaped workpiece. A machine tool comprising a tool is disclosed.

JP2017-213658A

However, with the machine tool of Patent Document 1, when a tool is brought into contact with a rotating workpiece, the workpiece vibrates, which may lead to deterioration of the surface quality of the workpiece.

Therefore, an object of the present invention is to provide a vibration suppressing device and the like that can suppress the vibration of a workpiece.

The vibration suppression device according to one aspect of the present invention is a vibration suppression device used in a turning machine that includes a headstock that grips one end of a workpiece extending along an axis and rotates the workpiece around the axis, and a tailstock that supports the other end of the workpiece and has a rotation center that rotates with the workpiece, and includes a plurality of first magnets that are aligned in a circumferential direction about the rotation axis of the workpiece and have their respective north and south poles aligned in a radial direction about the rotation axis, and a plurality of second magnets that are aligned in the circumferential direction and have their respective north and south poles aligned in the radial direction and are provided outside the plurality of first magnets in the radial direction, and one of the plurality of first magnets and the plurality of second magnets rotates with the workpiece relative to the other.

A turning device according to one aspect of the present invention includes a headstock that grips one end of a workpiece extending along an axis and rotates the workpiece around the axis, and a headstock that supports the other end of the workpiece. a tailstock having a rotation center that rotates together with the work; a plurality of tailstocks arranged in a circumferential direction centered on the rotational axis of the workpiece, each having an N pole and a south pole arranged in a radial direction centered on the rotational axis; 1 magnet, and a plurality of second magnets arranged in the circumferential direction, each having an N pole and a south pole arranged in the radial direction, and provided outside of the plurality of first magnets in the radial direction, One of the plurality of first magnets and the plurality of second magnets rotates with the workpiece relative to the other.

The present invention provides a vibration suppression device that can suppress the vibration of a workpiece.

FIG. 1 is a perspective view showing a turning device according to an embodiment. FIG. 2 is a sectional view showing the tailstock of the turning device of FIG. 1. FIG. FIG. 3 is a perspective view showing a vibration suppression device for the turning machine of FIG. FIG. 4 is a front view showing the vibration suppressing device of the turning machine of FIG. 1. FIG. FIG. 5 is a graph showing an example of torque applied to the turning apparatus of FIG. FIG. 6 is a perspective view showing another example of the vibration suppression device. FIG. 7 is a schematic diagram showing the vibration suppression device of FIG. 6. FIG. 8 is a perspective view showing another example of the vibration suppression device. FIG. 9 is a schematic diagram showing the vibration suppressing device of FIG. 8. FIG. 10 is a perspective view showing still another example of a vibration suppressing device. FIG. 11 is a schematic diagram showing the vibration suppression device of FIG.

Embodiments of the present invention will be described below. Note that all of the embodiments described below are specific examples of the present invention. Therefore, the numerical values, components, arrangement positions and connection forms of the components, steps and order of steps, etc. shown in the following embodiments are merely examples and do not limit the present invention.

The figures are schematic diagrams and are not necessarily rigorous illustrations. In each figure, the same reference numerals are used for substantially the same configurations, and duplicate explanations are omitted or simplified.

In addition, in this specification and the drawings, the x-axis, y-axis, and z-axis represent three axes of a three-dimensional orthogonal coordinate system, and the x-axis and y-axis are orthogonal to each other and are all connected to the z-axis. These are orthogonal axes.

In the following embodiments, expressions such as "parallel" and "orthogonal" may be used to indicate the relative orientation of two directions, but these expressions also include cases where the orientation is not strictly that. For example, when two directions are said to be orthogonal, unless otherwise specified, this does not only mean that the two directions are completely orthogonal, but also that the directions are substantially orthogonal, i.e., that they include a difference of, for example, about a few percent.

(Embodiment)
Fig. 1 is a perspective view showing a turning device 10 according to an embodiment. Fig. 2 is a cross-sectional view showing a tailstock 14 of the turning device 10 of Fig. 1. Fig. 2 shows a cross section perpendicular to the x-axis. The configuration of the turning device 10 will be described with reference to Figs. 1 and 2.

As shown in Figures 1 and 2, the turning device 10 is a device for turning a workpiece W. In this embodiment, the turning device 10 is a cutting device for cutting the workpiece W. For example, the cutting device is a lathe that processes the workpiece W by contacting a bit with the rotating workpiece W. The turning device 10 includes a headstock 12, a tailstock 14, a base 15, a cutting tool 16, and a vibration suppression device 18.

The headstock 12 grips one end of the workpiece W extending along the axis and rotates the workpiece W around the axis. In other words, the axis of the workpiece W and the rotational axis O of the workpiece W are aligned. In this embodiment, the workpiece W is rod-shaped. The headstock 12 has a chuck 20 that grips and grips the workpiece W, and the chuck 20 is fixed to a main shaft (not shown) included in the headstock 12. When the main shaft is rotated by a motor (not shown), the chuck 20 and the workpiece W gripped by the chuck 20 are rotated about the rotation axis O.

The tailstock 14 is provided on the opposite side of the workpiece W from the headstock 12 and supports the other end of the workpiece W. For example, tailstock 14 is a tail stock. The tailstock 14 includes a housing 22, a rotation center 24, a bearing 26, and a seal member 28.

The housing 22 houses a part of the revolving center 24, a bearing 26, a seal member 28, and a vibration suppression device 18. The housing 22 is supported by the base 15 so that it can move in the direction of the rotation axis O relative to the headstock 12. This allows the revolving center 24 and the like to move in the direction of the rotation axis O relative to the headstock 12.

The revolving center 24 supports the other end of the workpiece W and rotates together with the workpiece W. The revolving center 24 is supported by bearings 26 so that it can rotate around the rotation axis O. The revolving center 24 protrudes toward the headstock 12 side from the housing 22 and has a cone-shaped cone portion 30 that reduces in diameter as it approaches the headstock 12 side. The revolving center 24 supports the other end of the workpiece W by being pressed against the workpiece W with the apex 32 of the cone portion 30 fitted into a recess provided in the center of the other end face of the workpiece W, and rotates together with the workpiece W around the rotation axis O when the workpiece W rotates.

The base 15 is integral with the headstock 12 and supports the housing 22 so that it can move in the direction of the rotation axis O, as described above.

The cutting tool 16 cuts the rotating workpiece W by contacting the rotating workpiece W from the outside in the radial direction about the rotational axis O. In addition, in the following description, the radial direction centered on the rotational axis O is also simply referred to as the radial direction. For example, the cutting tool 16 is a cutting tool.

The vibration suppression device 18 is a device that suppresses vibration of the workpiece W. Specifically, for example, the vibration of the workpiece W is chatter vibration of the workpiece W. The vibration suppression device 18 has a first magnetic field generating member 34 and a second magnetic field generating member 36. The first magnetic field generating member 34 and the second magnetic field generating member 36 are built into the tailstock 14.

The configuration of the turning device 10 has been described above.

FIG. 3 is a perspective view showing the vibration suppression device 18 of the turning machine 10 of FIG. 1. FIG. 4 is a schematic diagram showing the vibration suppression device 18 of the turning machine 10 of FIG. 1. The configuration of the vibration suppression device 18 will be described with reference to FIGS. 2 to 4.

The first magnetic field generating member 34 generates a magnetic field that acts on the second magnetic field generating member 36. The first magnetic field generating member 34 rotates with the workpiece W relative to the second magnetic field generating member 36. The first magnetic field generating member 34 is fixed to the rotation center 24 in the housing 22, and rotates with the rotation center 24 and the workpiece W about the rotation axis O. The first magnetic field generating member 34 has a holder 38 and multiple (ten in this embodiment) first magnets 40.

The holding body 38 holds a plurality of first magnets 40 . The holding body 38 has a cylindrical shape extending in the circumferential direction centered on the rotation axis O, and the rotation center 24 is inserted inside the holding body 38 . In addition, in the following description, the circumferential direction centered on the rotational axis O is also simply referred to as the circumferential direction. The holder 38 is fixed to the outer peripheral surface of the rotation center 24. For example, the holder 38 is fixed to the rotation center 24 by press-fitting the rotation center 24 into the holder 38 . For example, the holder 38 is made of a non-magnetic material such as aluminum. The holding body 38 has a plurality of holes 39.

The plurality of holes 39 are provided corresponding to the plurality of first magnets 40, and each of the plurality of holes 39 has a first magnet 40 corresponding to the hole 39 among the plurality of first magnets 40. It is accommodated. Each of the plurality of holes 39 passes through the holder 38 in the direction of the rotation axis O in which the rotation axis O extends. Note that, for example, each of the plurality of holes 39 does not have to penetrate through the holder 38 in the rotation axis O direction, and may be open only on one side in the rotation axis O direction. The plurality of holes 39 are lined up in the circumferential direction.

The first magnets 40 are arranged in the circumferential direction. The first magnets 40 are arranged at equal intervals in the circumferential direction. The N poles and S poles of the first magnets 40 are arranged in the radial direction. In the first magnets 40, the first magnets 40 whose N poles are located outside the S poles in the radial direction and the first magnets 40 whose S poles are located outside the N poles in the radial direction are arranged alternately in the circumferential direction. Each of the first magnets 40 is curved along the circumferential direction. The sizes of the first magnets 40 are equal to each other. The first magnets 40 rotate with the workpiece W relative to the second magnets 44. The first magnets 40 are fixed to the rotating center 24 and rotate with the workpiece W relative to the second magnets 44. Each of the first magnets 40 is fixed to the hole 39 and fixed to the rotating center 24 via the holder 38. Each of the first magnets 40 is a permanent magnet.

The second magnetic field generating member 36 generates a magnetic field that acts on the first magnetic field generating member 34. The second magnetic field generating member 36 is provided radially outward of the first magnetic field generating member 34. In other words, the second magnetic field generating member 36 faces the first magnetic field generating member 34 radially. The second magnetic field generating member 36 is fixed to the housing 22 and does not rotate together with the workpiece W. The second magnetic field generating member 36 has a holder 42 and multiple (ten in this embodiment) second magnets 44.

The holder 42 holds a plurality of second magnets 44. The holder 42 is cylindrical and extends in the circumferential direction about the rotation axis O. Inside the holder 42, the first magnetic field generating member 34 is provided so as to be rotatable about the rotation axis O. The holder 42 is fixed to the housing 22. For example, the holder 42 is fixed to the housing 22 by being pressed into the housing 22. For example, the holder 42 is made of a non-magnetic material such as aluminum. The holder 42 has a plurality of holes 43.

The multiple holes 43 are provided corresponding to the multiple second magnets 44, and each of the multiple holes 43 houses a second magnet 44 corresponding to the hole 43 among the multiple second magnets 44. Each of the multiple holes 43 penetrates the holder 42 in the direction of the rotation axis O in which the rotation axis O extends. Note that, for example, each of the multiple holes 43 does not have to penetrate the holder 42 in the direction of the rotation axis O, and may be open only on one side in the direction of the rotation axis O. The multiple holes 43 are arranged in the circumferential direction.

The second magnets 44 are arranged in the circumferential direction. The second magnets 44 are arranged at equal intervals in the circumferential direction. The intervals (angular intervals) at which the first magnets 40 are arranged in the circumferential direction and the intervals (angular intervals) at which the second magnets 44 are arranged in the circumferential direction are equal to each other. The number of the first magnets 40 and the number of the second magnets 44 are equal to each other. The second magnets 44 are provided radially outward of the first magnets 40. The N poles and S poles of each of the second magnets 44 are arranged radially. In the second magnets 44, the second magnets 44 whose N poles are located radially outward of the S poles and the second magnets 44 whose S poles are located radially outward of the N poles are arranged alternately in the circumferential direction. Each of the second magnets 44 is curved along the circumferential direction. The sizes of the second magnets 44 are equal to each other. The second magnets 44 do not rotate together with the workpiece W. The second magnets 44 are fixed to the housing 22 and do not rotate with the workpiece W. Each of the second magnets 44 is fixed to a hole 43 and fixed to the housing 22 via a holder 42. Each of the second magnets 44 is a permanent magnet.

The configuration of the vibration suppression device 18 has been explained above.

Figure 5 is a graph showing an example of the torque applied to the turning device 10 of Figure 1. The vibration suppression method using the vibration suppression device 18 will be described with reference to Figures 4 and 5.

As shown in FIG. 4, when the workpiece W rotates, the plurality of first magnets 40 rotate relative to the plurality of second magnets 44 (see the thick line in FIG. 4).

For example, if the north pole of a first magnet 40 is located radially outboard of the south pole and the south pole of a second magnet 44 is located forward in the direction of rotation, a magnetic force that attracts the first magnet 40 and the second magnet 44 together is generated between the first magnet 40 and the second magnet 44. This magnetic force accelerates the rotation of the first magnet 40, i.e., the rotation of the workpiece W.

For example, if the north pole of a first magnet 40 is located radially outboard of the south pole and the south pole of a second magnet 44 is located rearward in the direction of rotation, a magnetic force that attracts the first magnet 40 and the second magnet 44 together is generated between the first magnet 40 and the second magnet 44. This magnetic force slows down the rotation of the first magnet 40, i.e., the rotation of the workpiece W.

For example, if the N pole of a second magnet 44, whose S pole is located radially outward of the N pole of a first magnet 40, is located forward in the direction of rotation relative to the N pole of the first magnet 40, whose S pole is located radially outward of the N pole, a magnetic force that repels the first magnet 40 and the second magnet 44 is generated between the first magnet 40 and the second magnet 44. This magnetic force slows down the rotation of the first magnet 40, i.e., the rotation of the workpiece W.

For example, with respect to the N pole of the first magnet 40 whose N pole is located outside the S pole in the radial direction, a second magnet 40 whose S pole is located outside the N pole in the radial direction is rearward in the rotational direction. When the N pole of the magnet 44 is located, a magnetic force is generated between the first magnet 40 and the second magnet 44 that repels the first magnet 40 and the second magnet 44 . This magnetic force is a force that accelerates the rotation of the first magnet 40, that is, the rotation of the workpiece W.

For example, if the north pole of a second magnet 44, whose south pole is located radially outward of the north pole of a first magnet 40, is located forward in the direction of rotation with respect to the south pole of the first magnet 40, whose south pole is located radially outward of the north pole, a magnetic force that attracts the first magnet 40 and the second magnet 44 together is generated between the first magnet 40 and the second magnet 44. This magnetic force is a force that accelerates the rotation of the first magnet 40, i.e., the rotation of the workpiece W.

For example, if the north pole of a second magnet 44, whose south pole is located radially outward of the north pole of a first magnet 40, is located rearward in the direction of rotation with respect to the south pole of the first magnet 40, whose south pole is located radially outward of the north pole, a magnetic force that attracts the first magnet 40 and the second magnet 44 together is generated between the first magnet 40 and the second magnet 44. This magnetic force is a force that slows down the rotation of the first magnet 40, i.e., the rotation of the workpiece W.

For example, if the S pole of a second magnet 44, whose N pole is located radially outward of its S pole, is located forward in the direction of rotation relative to the S pole of a first magnet 40, whose N pole is located radially outward of its S pole, a magnetic force that repels the first magnet 40 and the second magnet 44 is generated between the first magnet 40 and the second magnet 44. This magnetic force slows down the rotation of the first magnet 40, i.e., the rotation of the workpiece W.

For example, if the S pole of a second magnet 44, whose N pole is located radially outward of its S pole, is located rearward in the direction of rotation relative to the S pole of a first magnet 40, whose N pole is located radially outward of its S pole, a magnetic force that repels the first magnet 40 and the second magnet 44 is generated between the first magnet 40 and the second magnet 44. This magnetic force accelerates the rotation of the first magnet 40, i.e., the rotation of the workpiece W.

As shown in FIG. 5, when the first magnets 40 rotate together with the workpiece W, a force is intermittently applied to the rotation of the first magnets 40 by the magnetic force between the first magnets 40 and the second magnets 44, and a force is intermittently applied to the rotation of the workpiece W rotating together with the first magnets 40. For example, when the first magnets 40 rotate together with the workpiece W, a force (torque) that slows down the rotation of the first magnets 40, i.e., the workpiece W, and a force (torque) that accelerates the rotation of the first magnets 40, i.e., the workpiece W, are continuously generated.

Here, during one rotation of the workpiece W, a force (torque) that decelerates the rotation of the workpiece W and a force (torque) that accelerates the rotation of the workpiece W occur consecutively multiple times. There is. In other words, a force (torque) that decelerates the rotation of the workpiece W and a force (torque) that accelerates the rotation of the workpiece W are repeatedly generated in a cycle shorter than the rotational cycle of the workpiece W. ing.

In this embodiment, for example, the vibration suppression device 18 suppresses the vibration of the workpiece W by repeatedly generating a force that decelerates the rotation of the workpiece W and a force that accelerates the rotation of the workpiece W in succession at a period shorter than the rotation period of the workpiece W. Note that, for example, the vibration suppression device 18 can also suppress the vibration of the workpiece W by repeatedly generating a force that accelerates the rotation of the workpiece W and a force that decelerates the rotation of the workpiece W in succession at a period shorter than the rotation period of the workpiece W.

The above describes the vibration suppression method using the vibration suppression device 18.

Next, we will explain the experimental results of vibration measurement of the workpiece W.

Here, the spindle rotation speed is 4760 rpm, the circumferential speed is 224 m/min, the feed rate is 0.2 mm/rev, the tailstock thrust is 3.0 kN, the chuck pressure is 2.0, and the diameter is 15 mm. Cuts of 0.1 mm, 0.15 mm, 0.2 mm, and 0.25 mm were formed on a work W having a length of 300 mm and a material of SUS304.

In the turning machine not equipped with the vibration suppression device 18, vibration occurred in the workpiece W when cuts of 0.15 mm and 0.2 mm were processed.

On the other hand, in the turning device 10 equipped with the vibration suppressing device 18, no vibration occurs in the workpiece W when machining any of the cuts of 0.1 mm, 0.15 mm, 0.2 mm, and 0.25 mm. Ta.

In this way, it has been found that the vibration of the workpiece W can be suppressed by the vibration suppressing device 18.

The experimental results of vibration measurement of the workpiece W have been described above.

The vibration suppression device 18 according to the embodiment includes a headstock 12 that grips one end of a workpiece W extending along the axis and rotates the workpiece W around the axis, and a headstock 12 that supports the other end of the workpiece W. A vibration suppressing device 18 used in a turning machine 10 including a tailstock 14 having a rotation center 24 that rotates together with the work W, the vibration suppressing device 18 being arranged in the circumferential direction around the rotation axis O of the work W; A plurality of first magnets 40 whose poles and S poles are arranged in a radial direction centered on the rotation axis O, and a plurality of first magnets 40 which are arranged in a circumferential direction and whose respective N and S poles are arranged in a radial direction. 40, one of the first magnets 40 and the second magnets 44 rotates with the workpiece W relative to the other.

According to this, when one of the plurality of first magnets 40 and the plurality of second magnets 44 is rotating with the workpiece W relative to the other, the plurality of first magnets 40 and the plurality of second magnets 44 are The magnetic force generated between them can intermittently apply force to the rotation of the workpiece W, so vibrations of the workpiece W can be suppressed.

Furthermore, in the vibration suppressing device 18 according to the embodiment, the plurality of first magnets 40 are arranged at equal intervals in the circumferential direction, and the plurality of second magnets 44 are arranged at equal intervals in the circumferential direction.

This makes it easier to generate a force that accelerates the rotation of the workpiece W and a force that decelerates the rotation of the workpiece W in succession at equal intervals, thereby further suppressing vibration of the workpiece W. Also, this makes it easier to generate a force that decelerates the rotation of the workpiece W and a force that accelerates the rotation of the workpiece W in succession at equal intervals, thereby further suppressing vibration of the workpiece W.

Furthermore, in the vibration suppressing device 18 according to the embodiment, the intervals at which the plurality of first magnets 40 are lined up in the circumferential direction and the intervals at which the plurality of second magnets 44 are lined up in the circumferential direction are mutually equal.

According to this, the force that accelerates the rotation of the workpiece W and the force that decelerates the rotation of the workpiece W are easily generated successively at equal intervals, so that vibrations of the workpiece W can be further suppressed. Further, since the force that decelerates the rotation of the workpiece W and the force that accelerates the rotation of the workpiece W are easily generated successively at equal intervals, vibrations of the workpiece W can be further suppressed.

Furthermore, in the vibration suppressing device 18 according to the embodiment, the number of first magnets 40 and the number of second magnets 44 are equal to each other.

This makes it easier to increase both the force that accelerates the rotation of the workpiece W and the force that decelerates the rotation of the workpiece W, thereby further suppressing the vibration of the workpiece W.

In addition, in the vibration suppression device 18 according to the embodiment, among the multiple first magnets 40, first magnets 40 whose north poles are positioned outside their south poles in the radial direction and first magnets 40 whose south poles are positioned outside their north poles in the radial direction are alternately arranged in the circumferential direction, and among the multiple second magnets 44, second magnets 44 whose north poles are positioned outside their south poles in the radial direction and second magnets 44 whose south poles are positioned outside their north poles in the radial direction are alternately arranged in the circumferential direction.

This makes it easier to generate a force that accelerates the rotation of the workpiece W and a force that decelerates the rotation of the workpiece W in succession at equal intervals, thereby further suppressing vibration of the workpiece W. Also, this makes it easier to generate a force that decelerates the rotation of the workpiece W and a force that accelerates the rotation of the workpiece W in succession at equal intervals, thereby further suppressing vibration of the workpiece W.

Furthermore, in the vibration suppressing device 18 according to the embodiment, the plurality of first magnets 40 and the plurality of second magnets 44 are built into the tailstock 14 .

According to this, by providing the vibration suppressing device 18, it is possible to suppress the turning device 10 from increasing in size. For example, by providing the vibration suppressing device 18 in place of the bearing that was originally built into the existing tailstock and supporting the rotation center, it is possible to suppress the existing turning device from increasing in size.

Furthermore, in the vibration suppressing device 18 according to the embodiment, the plurality of first magnets 40 are fixed to the rotation center 24 and rotate together with the workpiece W relative to the plurality of second magnets 44 .

According to this, by fixing the plurality of first magnets 40 to the rotation center 24 that supports the workpiece W, a force that accelerates the rotation of the workpiece W and a force that decelerates the rotation of the workpiece W are provided. The vibration of the workpiece W can be easily suppressed.

The turning device 10 according to the embodiment includes a headstock 12 that grips one end of the workpiece W extending along the axis and rotates the workpiece W around the axis, a tailstock 14 that supports the other end of the workpiece W and has a rotation center 24 that rotates with the workpiece W, a plurality of first magnets 40 that are aligned in the circumferential direction around the rotation axis O of the workpiece W and have their respective north and south poles aligned in the radial direction around the rotation axis O, and a plurality of second magnets 44 that are aligned in the circumferential direction and have their respective north and south poles aligned in the radial direction and are provided radially outside the plurality of first magnets 40, and one of the plurality of first magnets 40 and the plurality of second magnets 44 rotates with the workpiece W relative to the other.

According to this, the same effects as the vibration suppressing device 18 described above can be achieved.

FIG. 6 is a perspective view showing another example of the vibration suppression device. FIG. 7 is a schematic diagram showing the vibration suppression device of FIG. 6. Another example of the vibration suppression device will be described with reference to FIGS. 6 and 7.

As shown in FIGS. 6 and 7, the vibration suppressing device 18a has a first magnetic field generating member 34a instead of the first magnetic field generating member 34, and a second magnetic field generating member 34a instead of the second magnetic field generating member 36. The main difference from the vibration suppressing device 18 is that it includes a magnetic field generating member 36a.

The first magnetic field generating member 34a differs from the first magnetic field generating member 34 mainly in that it has a holder 38a instead of the holder 38, and in that it has multiple (six in this embodiment) first magnets 40. The holder 38a differs from the holder 38 in the number of holes 39.

The second magnetic field generating member 36a has a holder 42a instead of the holder 42, and a plurality of (six in this embodiment) second magnets 44. This is mainly different from the second magnetic field generating member 36. The holding body 42a is different from the holding body 42 in the number of holes 43.

In this way, the number of first magnets does not have to be 10, but may be 6, or any number more than one. Also, the number of second magnets does not have to be 10, but may be 6, or any number more than one.

The vibration suppression device 18a has been described above.

Figure 8 is a perspective view showing another example of a vibration suppression device. Figure 9 is a schematic diagram showing the vibration suppression device of Figure 8. Other examples of vibration suppression devices will be described with reference to Figures 8 and 9.

As shown in FIGS. 8 and 9, the vibration suppressing device 18b has a first magnetic field generating member 34b instead of the first magnetic field generating member 34, and a second magnetic field generating member 34b instead of the second magnetic field generating member 36. The main difference from the vibration suppressing device 18 is that it includes a magnetic field generating member 36b.

The first magnetic field generating member 34b differs from the first magnetic field generating member 34 mainly in that it has a holder 38b instead of the holder 38, and in that it has multiple (eight in this embodiment) first magnets 40b. The holder 38b differs from the holder 38 in the number of holes 39.

The plurality of first magnets 40b are different from each other in that the number of first magnets 40b is different from the number of first magnets 40, and in the radial direction, the N pole is located outside the S pole of the first magnet 40b. The order in which the first magnet 40b whose south pole is located outside the north pole is arranged in the radial direction is the first magnet 40 whose north pole is located outside the south pole, and the first magnet 40b whose south pole is located outside the north pole in the radial direction. It differs from the plurality of first magnets 40 mainly in that it is different from the order in which the first magnets 40 are arranged.

In the multiple first magnets 40b, first magnets 40b with their north poles positioned outside their south poles in the radial direction and first magnets 40b with their south poles positioned outside their north poles in the radial direction are alternately arranged in multiples in the circumferential direction. Specifically, in the multiple first magnets 40b, first magnets 40b with their north poles positioned outside their south poles in the radial direction and first magnets 40b with their south poles positioned outside their north poles in the radial direction are alternately arranged in groups of two in the circumferential direction. Note that in the multiple first magnets 40b, first magnets 40b with their north poles positioned outside their south poles in the radial direction and first magnets 40b with their south poles positioned outside their north poles in the radial direction may be alternately arranged in groups of three or more in the circumferential direction, rather than two by two in the circumferential direction.

The second magnetic field generating member 36a has a holder 42b instead of the holder 42, and a plurality of (six in this embodiment) second magnets 44b. This is mainly different from the second magnetic field generating member 36. The holding body 42b is different from the holding body 42 in the number of holes 43.

The multiple second magnets 44b differ from the multiple second magnets 44 mainly in that the number of second magnets 44b is different from the number of second magnets 44, and the order in which the second magnets 44b whose north poles are positioned outside the south poles in the radial direction and the second magnets 44b whose south poles are positioned outside the north poles in the radial direction are arranged is different from the order in which the second magnets 44 whose north poles are positioned outside the south poles in the radial direction and the second magnets 44 whose south poles are positioned outside the north poles in the radial direction are arranged.

In the plurality of second magnets 44b, the second magnet 44b whose N pole is located outside the S pole in the radial direction and the second magnet 44b whose S pole is located outside the N pole in the radial direction are arranged in the circumferential direction. Multiple pieces are lined up alternately. Specifically, among the plurality of second magnets 44b, a second magnet 44b whose N pole is located outside the S pole in the radial direction, and a second magnet 44b whose S pole is located outside the N pole in the radial direction. are arranged alternately in the circumferential direction, two at a time. In addition, among the plurality of second magnets 44b, the second magnet 44b whose N pole is located outside the S pole in the radial direction and the second magnet 44b whose S pole is located outside the N pole in the radial direction are as follows: Instead of two pieces each in the circumferential direction, three or more pieces may be arranged alternately in the circumferential direction.

In this way, the first magnets whose north poles are positioned radially outward of the south poles and the first magnets whose south poles are positioned radially outward of the north poles do not have to be arranged alternately in the circumferential direction, but may be arranged in groups of multiple magnets in the circumferential direction.

In addition, the second magnets whose north poles are positioned radially outward of the south poles and the second magnets whose south poles are positioned radially outward of the north poles do not have to be arranged alternately in the circumferential direction, and may be arranged in groups of multiple magnets in the circumferential direction.

The vibration suppression device 18a has been described above.

In the vibration suppressing device 18b according to the embodiment, in the plurality of first magnets 40b, the N pole is located outside the S pole in the radial direction, and the S pole is located outside the N pole in the radial direction. A plurality of second magnets 44b are arranged alternately in the circumferential direction, and in the plurality of second magnets 44b, the N pole is located outside the S pole in the radial direction, and the second magnet 44b is located outside the S pole in the radial direction. A plurality of second magnets 44b whose poles are located outside the north pole are alternately arranged in the circumferential direction.

According to this, the period in which a force that accelerates the rotation of the workpiece W is generated and the period in which a force that decelerates the rotation of the workpiece W are generated can be made longer, so that vibrations of the workpiece W can be further suppressed.

Figure 10 is a perspective view showing yet another example of a vibration suppression device. Figure 11 is a schematic diagram showing the vibration suppression device of Figure 10. Other examples of vibration suppression devices will be described with reference to Figures 10 and 11.

As shown in FIGS. 10 and 11, the vibration suppressing device 18c has a first magnetic field generating member 34c instead of the first magnetic field generating member 34, and a second magnetic field generating member 34c instead of the second magnetic field generating member 36. The main difference from the vibration suppressing device 18 is that it includes a magnetic field generating member 36c.

The first magnetic field generating member 34c differs from the first magnetic field generating member 34 mainly in that it has a holder 38c instead of the holder 38, and in that it has multiple (10 in this embodiment) first magnets 40c.

The holder 38c differs from the holder 38 mainly in that the shape of the hole 39c is different from the hole 39, and the number of the holes 39c is different from the number of holes 39.

The plurality of first magnets 40c are different from each other in that the number of first magnets 40c is different from the number of first magnets 40, and the shape of the first magnets 40c is different from the shape of the first magnet 40. This is mainly different from the first magnet 40.

Both main surfaces of each of the plurality of first magnets 40c in the circumferential direction are parallel to each other and parallel to the radial direction, and both main surfaces of each of the plurality of first magnets 40c in the radial direction are parallel to each other and parallel to the radial direction. perpendicular to the direction. Each of the plurality of first magnets 40c is a so-called square permanent magnet.

The second magnetic field generating member 36c differs from the second magnetic field generating member 36 mainly in that it has a holder 42c instead of the holder 42, and in that it has multiple (10 in this embodiment) second magnets 44c.

The holder 42c differs from the holder 42 mainly in that the shape of the hole 43c is different from the hole 43, and the number of the holes 43c is different from the number of holes 43.

The multiple second magnets 44c differ from the multiple second magnets 44 mainly in that the number of second magnets 44c is different from the number of second magnets 44 and the shape of the second magnets 44c is different from the shape of the second magnets 44.

The two main surfaces of each of the multiple second magnets 44c in the circumferential direction are parallel to each other and to the radial direction, and the two main surfaces of each of the multiple second magnets 44c in the radial direction are parallel to each other and perpendicular to the radial direction. Each of the multiple second magnets 44c is a so-called rectangular permanent magnet.

In this way, each of the plurality of first magnets does not need to be curved along the circumferential direction, and may have a substantially rectangular parallelepiped shape.

Further, each of the plurality of second magnets does not need to be curved along the circumferential direction, and may have a substantially rectangular parallelepiped shape.

The vibration suppression device 18c has been described above.

(Additional Note)
The above description of the embodiments and the like discloses the following techniques.

(Technology 1)
A tailstock having a headstock that grips one end of a workpiece extending along an axis and rotates the workpiece around the axis, and a rotation center that supports the other end of the workpiece and rotates together with the workpiece. A vibration suppression device for use in a turning machine comprising a stand,
a plurality of first magnets arranged in a circumferential direction centered on the rotational axis of the workpiece, and each of which has an N pole and a south pole arranged in a radial direction centered on the rotational axis;
a plurality of second magnets arranged in the circumferential direction, each having an N pole and a south pole arranged in the radial direction, and provided outside of the plurality of first magnets in the radial direction;
one of the plurality of first magnets and the plurality of second magnets rotates with the workpiece relative to the other;
Vibration suppressor.

(Technique 2)
The first magnets are arranged at equal intervals in the circumferential direction,
The second magnets are arranged at equal intervals in the circumferential direction.
The vibration suppression device according to technology 1.

(Technology 3)
The intervals at which the plurality of first magnets are lined up in the circumferential direction and the intervals at which the plurality of second magnets are lined up in the circumferential direction are equal to each other,
The vibration suppression device according to technique 1 or 2.

(Technique 4)
The number of the first magnets and the number of the second magnets are equal to each other.
The vibration suppression device according to any one of the first to third aspects.

(Technique 5)
In the plurality of first magnets, first magnets whose N poles are positioned outside their S poles in the radial direction and first magnets whose S poles are positioned outside their N poles in the radial direction are alternately arranged in the circumferential direction,
In the plurality of second magnets, second magnets whose N poles are positioned outside of S poles in the radial direction and second magnets whose S poles are positioned outside of N poles in the radial direction are alternately arranged in the circumferential direction.
The vibration suppression device according to any one of the first to fourth aspects.

(Technique 6)
Among the plurality of first magnets, first magnets whose N poles are positioned outside of S poles in the radial direction and first magnets whose S poles are positioned outside of N poles in the radial direction are alternately arranged in multiples in the circumferential direction,
Among the plurality of second magnets, second magnets whose N poles are positioned outside of S poles in the radial direction and second magnets whose S poles are positioned outside of N poles in the radial direction are alternately arranged in multiples in the circumferential direction.
The vibration suppression device according to any one of the first to fourth aspects.

(Technology 7)
The plurality of first magnets and the plurality of second magnets are built into the tailstock,
The vibration suppression device according to any one of techniques 1 to 6.

(Technology 8)
The plurality of first magnets are fixed to the rotation center and rotate together with the workpiece relative to the plurality of second magnets.
The vibration suppression device according to any one of techniques 1 to 7.

(Technique 9)
a headstock that grips one end of a workpiece extending along a shaft core and rotates the workpiece about the shaft core;
a tailstock having a rotation center that supports the other end of the work and rotates together with the work;
A plurality of first magnets arranged in a circumferential direction around a rotation axis of the workpiece, with the N poles and S poles of each first magnet arranged in a radial direction around the rotation axis;
a plurality of second magnets arranged in the circumferential direction, each of whose north pole and south pole is arranged in the radial direction, and disposed radially outward of the plurality of first magnets;
One of the plurality of first magnets and the plurality of second magnets rotates relative to the other together with the workpiece.
Turning equipment.

(Other embodiments, etc.)
Although the vibration suppressing device and turning device according to the present invention have been described above based on the embodiments, the present invention is not limited to the embodiments. The present invention also includes forms obtained by making modifications to the embodiments that those skilled in the art would think of, and other forms realized by arbitrarily combining components in a plurality of embodiments.

In the above-described embodiment, the turning device 10 is described as a cutting device, but the present invention is not limited to this. For example, the turning device may be a polishing device. For example, a polishing device is a device that processes a workpiece by bringing fine abrasive grains into contact with the rotating workpiece.

Furthermore, in the embodiment described above, a case has been described in which the plurality of first magnets 40 and the plurality of second magnets 44 are built into the tailstock 14, but the present invention is not limited to this. For example, the plurality of first magnets and the plurality of second magnets may be built into the headstock. In this case, for example, one of the plurality of first magnets and the plurality of second magnets may be fixed to a spindle or the like included in the headstock and rotated together with the workpiece.

In the above embodiment, the multiple first magnets 40 are fixed to the rotation center 24 inside the housing 22, but this is not limiting. For example, the multiple first magnets may be fixed to the rotation center outside the housing. In this case, the multiple second magnets may also be provided outside the housing. Also, for example, the multiple first magnets may be fixed to a member that rotates together with the workpiece other than the rotation center.

Further, in the embodiment described above, a case has been described in which the plurality of first magnets 40 rotate with respect to the plurality of second magnets 44 together with the workpiece W, but the present invention is not limited to this. For example, the plurality of first magnets may not rotate together with the workpiece W, and the plurality of second magnets may rotate together with the workpiece W relative to the plurality of first magnets.

Further, in the embodiment described above, a case has been described in which the plurality of first magnets 40 are arranged at regular intervals in the circumferential direction, but the present invention is not limited to this. For example, the plurality of first magnets may be arranged at different intervals in the circumferential direction. The same applies to the plurality of second magnets.

Further, in the embodiment described above, a case has been described in which the sizes of the plurality of first magnets 40 are equal to each other, but the present invention is not limited to this. For example, the sizes of the plurality of first magnets may be different from each other. The same applies to the plurality of second magnets.

Further, in the embodiment described above, a case has been described in which the intervals between the plurality of first magnets 40 and the intervals between the plurality of second magnets 44 arranged in the circumferential direction are equal to each other, but the present invention is not limited to this. For example, the intervals at which the plurality of first magnets are lined up in the circumferential direction and the intervals at which the plurality of second magnets are lined up in the circumferential direction may be different from each other.

Furthermore, in the embodiment described above, a case has been described in which the number of the plurality of first magnets 40 and the number of the plurality of second magnets 44 are equal to each other, but the present invention is not limited to this. For example, the number of first magnets and the number of second magnets may be different from each other.

The turning device of the present invention can be used as a device that rotates a workpiece to grind or polish the workpiece.

REFERENCE SIGNS LIST 10 Turning device 12 Headstock 14 Tailstock 15 Base 16 Cutting tool 18, 18a, 18b, 18c Vibration suppression device 20 Chuck 22 Housing 24 Rotation center 26 Bearing 28 Seal member 30 Cone portion 32 Top portion 34, 34a, 34b, 34c First magnetic field generating member 36, 36a, 36b, 36c Second magnetic field generating member 38, 38a, 38b, 38c, 42, 42a, 42b, 42c Holder 39, 39c, 43, 43c Hole portion 40, 40b, 40c First magnet 44, 44b, 44c Second magnet

Claims (9)

A vibration suppression device for use in a turning machine including a headstock that grips one end of a workpiece extending along an axis and rotates the workpiece around the axis, and a tailstock that supports the other end of the workpiece and has a rotation center that rotates together with the workpiece,
A plurality of first magnets arranged in a circumferential direction around a rotation axis of the workpiece, with the N poles and S poles of each first magnet arranged in a radial direction around the rotation axis;
a plurality of second magnets arranged in the circumferential direction, with their respective N poles and S poles arranged in the radial direction, and disposed radially outward of the plurality of first magnets;
One of the plurality of first magnets and the plurality of second magnets rotates relative to the other together with the workpiece.
Vibration suppression device. The plurality of first magnets are arranged at equal intervals in the circumferential direction,
The plurality of second magnets are arranged at equal intervals in the circumferential direction,
The vibration suppression device according to claim 1. The intervals at which the first magnets are arranged in the circumferential direction and the intervals at which the second magnets are arranged in the circumferential direction are equal to each other.
The vibration suppression device according to claim 1 . The number of the first magnets and the number of the second magnets are equal to each other.
The vibration suppression device according to claim 1 . In the plurality of first magnets, first magnets whose N poles are positioned outside their S poles in the radial direction and first magnets whose S poles are positioned outside their N poles in the radial direction are alternately arranged in the circumferential direction,
In the plurality of second magnets, second magnets whose N poles are positioned outside of S poles in the radial direction and second magnets whose S poles are positioned outside of N poles in the radial direction are alternately arranged in the circumferential direction.
The vibration suppression device according to claim 1 . In the plurality of first magnets, a first magnet whose N pole is located outside the S pole in the radial direction and a first magnet whose S pole is located outside the N pole in the radial direction are arranged in the circumferential direction. Alternately line up multiple pieces in the direction,
In the plurality of second magnets, a second magnet whose N pole is located outside the S pole in the radial direction and a second magnet whose S pole is located outside the N pole in the radial direction are arranged in the circumferential direction. Alternately line up in multiple directions,
The vibration suppression device according to any one of claims 1 to 4. the plurality of first magnets and the plurality of second magnets are built into the tailstock;
The vibration suppression device according to claim 1 . the first magnets are fixed to the rotating center and rotate together with the workpiece relative to the second magnets;
The vibration suppression device according to claim 1 . a headstock that grips one end of a workpiece extending along a shaft core and rotates the workpiece about the shaft core;
a tailstock having a rotation center that supports the other end of the work and rotates together with the work;
A plurality of first magnets arranged in a circumferential direction around a rotation axis of the workpiece, with the N poles and S poles of each first magnet arranged in a radial direction around the rotation axis;
a plurality of second magnets arranged in the circumferential direction, with their respective N poles and S poles arranged in the radial direction, and disposed radially outward of the plurality of first magnets;
One of the plurality of first magnets and the plurality of second magnets rotates relative to the other together with the workpiece.
Turning equipment.

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