JP2014091172A - Grinding spindle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a grinding spindle that is simply structured and even if an angle between a driving shaft and a grinding wheel spindle inside a quill is large, can transmit large high-speed rotary power stably to a grinding wheel.SOLUTION: The grinding spindle, in which a rotating shaft line Y of a grinding wheel spindle 12, which is arranged on a tip of a quill 1 and has a grinding wheel 15 attached to a protruding end protruding outward from a grinding wheel spindle supporting body 10, is obliquely provided on a spindle line X of a driving spindle 2 arranged inside the quill 1, is provided with a magnetic coupling 20 as means for transmitting rotary power of the driving spindle 2 to the grinding wheel spindle 12, that contactlessly connects opposing ends of the driving spindle 2 and the grinding wheel spindle 12 and magnetically transmits the rotary power of the driving spindle 2 to the grinding wheel spindle 12.

Description

  The present invention relates to a grinding spindle provided with an axis of rotation of a grindstone disposed at the tip of a quill being inclined with respect to a drive shaft disposed within the quill, among grinding spindles used in a grinding machine.

  In a thread grinding machine that grinds with the grindstone's rotation axis tilted with respect to the main axis, the grindstone's rotation axis is tilted with respect to the main axis by an angle equal to the lead angle of the thread groove (for example, the thread groove of a ball nut). By grinding a grindstone formed in the same shape as the shape while moving along the thread groove, the thread groove is processed into an accurate shape.

  In this case, since the drive shaft inside the quill mounted on the grindstone table and the rotation shaft of the grindstone are in an angled relationship, for example, a transmission device is interposed between the opposite ends of both shafts, The rotation of the drive shaft is transmitted to the rotation shaft of the grindstone.

  As an example of the transmission device, Patent Literature 1 and Patent Literature 2 disclose a device that transmits the rotation of the drive shaft inside the quill to the rotation shaft of the grindstone using a flexible shaft (drive wire) or a bevel gear. ing.

  Patent Document 3 and Patent Document 4 disclose ones that drive a grindstone by blowing coolant or compressed air onto a turbine provided coaxially with the grindstone without using a drive shaft or a transmission device.

JP 55-58919 A JP 2000-74046 A JP-A-4-256571 JP 2000-52148 A

  By the way, in the system using the flexible shaft, since it is necessary to provide a mechanism for preventing the flexible shaft from violating during rotation, the configuration becomes complicated. In addition, since the flexible shaft itself is a consumable item, replacement costs and labor are required. Further, since the flexible shaft has an elastic limit, the tilt angle of the grindstone cannot be increased. Moreover, since the method using a bevel gear rotates while the bevel gear is in contact, there are problems of wear and noise, and it is difficult to transmit high-speed rotation. Furthermore, the method of rotating the turbine with the force of the fluid has a problem that large rotational power cannot be transmitted.

  The present invention has been made in view of the above-described circumstances, and its object is to provide a high speed rotational power stably and stably even when the configuration is simple and the angle between the drive shaft inside the quill and the grindstone shaft is large. An object of the present invention is to provide a grinding spindle that can be transmitted to a machine.

The above object of the present invention is achieved by the following configurations.
(1) In a grinding spindle in which a rotation axis of a grindstone arranged at the tip of a quill is inclined with respect to an axis of a drive shaft arranged inside the quill,
As means for transmitting the rotational power of the drive shaft to the rotational shaft of the grindstone, the opposing ends of the drive shaft and the rotational shaft are connected in a non-contact manner, and the rotational power of the drive shaft is transmitted to the rotational shaft by magnetic force. A grinding spindle characterized in that a magnetic coupling is provided.
(2) The magnetic coupling includes a cylindrical member coupled to one of opposed ends of the drive shaft and the rotation shaft, and a shaft coupled to the other and inserted into the cylindrical member in a non-contact manner. The magnets that generate the magnetic force are arranged on an inner peripheral surface of the cylindrical member and an outer peripheral surface of the shaft-shaped member facing the inner peripheral surface. The grinding spindle as described in 1).
(3) The magnetic coupling is composed of a pair of umbrella-shaped members that are coupled to the opposing end portions of the drive shaft and the rotation shaft and whose outer peripheral surfaces are brought close to each other in a non-contact manner, and the umbrella-shaped members are opposed to each other. The grinding spindle according to (1), wherein magnets that generate the magnetic force are arranged on an outer peripheral surface.

  According to the grinding spindle of the present invention, the driving shaft in the quill and the opposite end of the rotating shaft of the grindstone are connected in a non-contact manner using a magnetic coupling, and the rotational power of the driving shaft is inclined with respect to the driving shaft. Because it is transmitted to the rotation axis of the grindstone, even if the inclination angle of the rotation axis of the grindstone is large, or even if there is an error in the angle between the drive shaft and the rotation shaft, large high speed rotational power is stably transmitted to the grindstone. be able to. Therefore, it is possible to easily cope with a large lead nut processing. In addition, since the magnetic coupling is simple in structure and transmits rotation without contact, there is no consumable as in the case of using a flexible shaft, and there is no wear or noise in the case of using a bevel gear. It does not occur.

It is sectional drawing of the grinding spindle of 1st Embodiment of this invention. It is sectional drawing of the grinding spindle of 2nd Embodiment of this invention.

  Hereinafter, a grinding spindle according to each embodiment of the present invention will be described with reference to the drawings.

(First embodiment)
In the grinding spindle of the first embodiment, as shown in FIG. 1, the cylindrical quill 1 is held on a grinding wheel base (not shown) of a grinding machine via a quill holder 3. The axis of the quill 1 is set parallel to the axis of the main spindle (not shown) of the grinding machine.

  Support holes 1a and 3a are provided inside the quill 1 and the quill holder 3, and the drive shaft 2 is connected to the support holes 1a and 3a through a plurality of bearings 4 and 5 respectively combined in the back surface. It is housed rotatably. In this case, the axis X of the drive shaft 2 coincides with the central axis of the quill 1. A grindstone shaft support 10 is provided at the tip of the quill 1, and the grindstone shaft holder 10 is provided with a through hole 11 that is inclined by an angle α1 with respect to the axis X of the drive shaft 2. A grindstone shaft (rotary shaft) 12 is rotatably supported in the through-hole 11 via a plurality of bearings 14 combined on the back surface. As a result, the rotational axis Y of the grindstone shaft 12 is connected to the drive shaft 2. It is set to be inclined with respect to the axis X by an angle α1.

  The tip of the grindstone shaft 12 protrudes outward from the grindstone shaft support 10, and a disc-shaped grindstone 15 is attached to the protruding end. The tip surface of the grindstone shaft support 10 is formed as an inclined end surface 10a orthogonal to the rotation axis Y of the grindstone shaft 12, and the outer ring presser 16 of the bearing 14 is fixed to the inclined end surface 10a. .

  The base end portion of the grindstone shaft 12 is disposed in the vicinity of the distal end portion of the drive shaft 2, and the grindstone shaft 12 and the opposed end portion of the drive shaft 2 are connected in a non-contact manner by a magnetic coupling 20. The magnetic coupling 20 transmits the rotational power of the drive shaft 2 to the grindstone shaft 12 using magnetic force, and the cylindrical member 21 coupled to the opposed end portion of the drive shaft 2 and the opposed end portion of the grindstone shaft 12. The shaft member 22 is inserted into the cylindrical member 21 in a non-contact manner. Magnets 21 a and 22 a that generate magnetic force are arranged on the inner peripheral surface of the cylindrical member 21 and the outer peripheral surface of the shaft-shaped member 22 that faces the inner peripheral surface of the cylindrical member 21. The cylindrical member 21 may be coupled to the opposite end of the grindstone shaft 12 and the shaft member 22 may be coupled to the opposed end of the drive shaft 2.

  According to the grinding spindle configured in this manner, the drive shaft 2 inside the quill 1 and the opposed end portion of the grindstone shaft 12 are connected in a non-contact manner using the magnetic coupling 20, and the rotational power of the drive shaft 2 is increased. Since this is transmitted to the grindstone shaft 12 tilted with respect to the drive shaft 2, even if the tilt angle α1 of the grindstone shaft 12 is large or there is an error in the tilt angle α1, large high-speed rotational power can be stably supplied. 12 can be transmitted. Therefore, it is possible to easily cope with a large lead nut processing.

Moreover, the magnetic coupling 20 arrange | positions the cylindrical member 21 and the shaft-shaped member 22 each provided with the magnets 21a and 22a in a non-contact state, and also transmits rotation without a contact but simple. Therefore, no consumables are produced as in the case of using a conventional flexible shaft, and no wear or noise is generated as in the case of using a bevel gear.
Further, in the case of this magnetic coupling 20, since the shaft-shaped member 22 is inserted into the cylindrical member 21, the opposed end of the drive shaft 2 inside the quill 1 and the grindstone shaft 12 are close to each other. Can be suitably used. Moreover, since the shaft-shaped member 22 is inserted into the cylindrical member 21, the drive shaft 2 and the grindstone shaft 12 can be connected in a non-contact manner with a compact configuration that does not take up space.

(Second Embodiment)
In the grinding spindle of the second embodiment, as shown in FIG. 2, the cylindrical quill 51 is held on a grindstone base (not shown) of the grinding machine via the quill holder 3. The axis of the quill 51 is set parallel to the axis of the main spindle (not shown) of the grinding machine.

  Support holes 51a and 3a are provided inside the quill 51 and the quill holder 3, and a drive shaft 52 is provided in each of the support holes 51a and 3a via a plurality of bearings 4 and 5 combined on the back surface. It is housed rotatably. In this case, the axis X of the drive shaft 52 is set at a position parallel to the central axis of the quill 51 and offset by a certain distance. The tip of the quill 51 is provided with another support hole 61 inclined by an angle α2 with respect to the axis X of the drive shaft 52. The support hole 61 is provided with a grinding wheel shaft (via a plurality of bearings 64). (Rotating shaft) 62 is rotatably supported. Thereby, the rotation axis Y of the grindstone shaft 62 is set to be inclined by an angle α2 with respect to the axis X of the drive shaft 52.

  The tip of the grindstone shaft 62 protrudes outward from the tip of the quill 51, and the disc-shaped grindstone 15 is attached to the protruding end. The tip surface of the quill 51 is formed as an inclined end surface 51b orthogonal to the rotation axis Y of the grindstone shaft 62, and an outer ring presser 66 of the bearing 64 is fixed to the inclined end surface 51b.

  The base end portion of the grindstone shaft 62 and the distal end portion of the drive shaft 52 are spaced apart from each other, and the opposing end portions of the grindstone shaft 62 and the drive shaft 52 are connected in a non-contact manner by the magnetic coupling 70. . The magnetic coupling 70 in this case is composed of a pair of umbrella-shaped members 71 and 72 attached to the opposing end portions of the drive shaft 52 and the grindstone shaft 62, respectively. The pair of umbrella-shaped members 71 and 72 are combined in a state where the outer peripheral surfaces are close to each other without being in contact with each other, and magnets 71a and 72a that generate magnetic force on the outer peripheral surfaces of the umbrella-shaped members 71 and 72 facing each other. Are arranged side by side in the circumferential direction.

  According to the grinding spindle configured as described above, the magnetic coupling 70 is used to connect the driving shaft 52 inside the quill 51 and the opposed end portion of the grindstone shaft 62 in a non-contact manner, and the rotational power of the driving shaft 52 is increased. Since this is transmitted to the grindstone shaft 62 tilted with respect to the drive shaft 52, even if the tilt angle α2 of the grindstone shaft 62 is large or there is an error in the tilt angle α2, large high-speed rotational power can be stably supplied. 62. Therefore, it is possible to easily cope with a large lead nut processing.

  In addition, the magnetic coupling 70 has both umbrella-shaped members 71 and 72 having magnets 71a and 72a arranged in a non-contact state, and has a simple structure and transmits rotation without contact. Consumables do not appear as in the case of using a flexible shaft, and wear and noise do not occur as in the case of using a bevel gear.

  In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably. In addition, the material, shape, dimensions, number, arrangement location, and the like of each component in the above-described embodiment are arbitrary and are not limited as long as the present invention can be achieved.

1,51 Quill 2 Drive shaft 12,62 Wheel shaft (rotary shaft)
20, 70 Magnetic coupling 21 Tubular member 22 Shaft-shaped member 21a, 22a Magnet 71, 72 Umbrella-shaped member 71a, 72a Magnet X Axis of drive shaft Y Rotation axis of grindstone shaft

Claims (3)

In a grinding spindle provided with a rotation axis of a grindstone arranged at the tip of the quill being inclined with respect to an axis of a drive shaft arranged inside the quill,
As means for transmitting the rotational power of the drive shaft to the rotational shaft of the grindstone, the opposing ends of the drive shaft and the rotational shaft are connected in a non-contact manner, and the rotational power of the drive shaft is transmitted to the rotational shaft by magnetic force. A grinding spindle characterized in that a magnetic coupling is provided.   The magnetic coupling includes: a cylindrical member coupled to one of opposed ends of the drive shaft and the rotation shaft; and a shaft member coupled to the other and inserted in a non-contact manner into the cylindrical member. The magnet for generating the magnetic force is arranged on an inner peripheral surface of the cylindrical member and an outer peripheral surface of the shaft-shaped member facing the inner peripheral surface. Grinding spindle.   The magnetic coupling is composed of a pair of umbrella-shaped members that are coupled to the opposing end portions of the drive shaft and the rotating shaft, and whose outer peripheral surfaces are close to each other in a non-contact manner. The grinding spindle according to claim 1, wherein magnets generating the magnetic force are arranged.

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