CN203579402U - Grinding spindle - Google Patents

Abstract

The utility model relates to a grinding spindle used for grinding a ball nut for a ball screw. The spindle structurally comprises a quill, a grinding wheel and a driving mechanism, wherein the quill is cylindrical; the grinding wheel is arranged at the front end of the quill, and provided with a rotating shaft which is inclined relatively to the central shaft of the quill; the driving mechanism drives the grinding wheel to rotate, and is provided with a magnetic force shaft coupling; the opposite ends of a driving shaft and a grinding wheel shaft are connected in a non-contacting manner through the magnetic force shaft coupling; the rotating power of the driving shaft is transferred to the grinding wheel shaft through magnetic force.

Description

grinding spindle

technical field

The utility model relates to a grinding spindle used in a grinding spindle (spindle) of a grinding machine, in which the rotating shaft of a grinding wheel disposed at the front end of a quill is inclined relative to a drive shaft disposed inside the quill .

Background technique

In a thread grinder that grinds with the axis of rotation of the grinding wheel inclined relative to the spindle, the axis of rotation of the grinding wheel is rotated relative to the The main shaft is tilted, and the grinding wheel formed in the same shape as the cross-sectional shape of the thread groove is ground while moving along the thread groove, thereby machining the thread groove into a correct shape.

In this case, the drive shaft inside the quill is in an angular relationship with the rotation axis of the grinding wheel, so for example, Patent Document 1 discloses a technology that uses a bevel gear to drive the drive shaft inside the quill. The rotation of the shaft is transmitted to the axis of rotation of the grinding wheel.

However, in this prior art, since gears are used for power transmission, there is a problem that vibration and noise are generated and the machining accuracy of the raceway surface is deteriorated.

Patent Document 1: Japanese Patent Laid-Open No. 2013-129029

Utility model content

In view of the above circumstances, the utility model provides a grinding spindle, which has a simple structure and can reduce the Vibration and noise, and high-speed rotational power is transmitted to the grinding wheel.

In order to solve the above-mentioned problems, the present invention adopts the following technical solutions.

(1) A grinding spindle in which the axis of rotation of a grinding wheel disposed at the front end of a quill is inclined relative to the axis of a drive shaft disposed inside the quill, wherein, as the rotational power of the drive shaft, The mechanism transmitted to the rotating shaft of the grinding wheel is provided with a magnetic coupling that connects the drive shaft and the opposite ends of the rotating shaft in a non-contact manner to transfer the rotational power of the driving shaft through magnetic force. Passed to the axis of rotation.

(2) In the above (1), it is preferable that the magnetic coupling is constituted by a pair of umbrella-shaped members respectively coupled to the respective opposite ends of the drive shaft and the rotating shaft so that the outer peripheral surfaces approach each other in a non-contact manner. , magnets that generate magnetic force are arranged on the outer peripheral surfaces of the umbrella-shaped member facing each other.

Since the grinding spindle of the utility model uses a magnetic coupling, the rotational power is transmitted from the drive shaft inside the quill to the rotating shaft of the grinding wheel in a non-contact manner, so even if the inclination angle of the rotating shaft of the grinding wheel is large In the case of a bevel gear, there will be no wear and noise as in the case of using a bevel gear.

Description of drawings

FIG. 1 is a diagram showing a grinding spindle of the present invention.

Detailed ways

The grinding spindle of this embodiment is composed of a cylindrical quill 51, a grinding wheel 15 disposed at the front end of the quill 51 and having a rotation axis Y inclined with respect to the central axis X of the quill, and rotating the grinding wheel 15. The drive mechanism has a magnetic coupling 70, which connects the drive shaft 52 and the opposite ends of the grinding wheel shaft 61 in a non-contact manner, and magnetically couples the rotation of the drive shaft 52. The power is transmitted to the grinding wheel spindle 61 .

Example

Support holes 51 a , 3 a are provided inside the quill 51 and the quill holder 3 , and the drive shaft 52 is rotatably accommodated in these support holes 51 a , 3 a via bearings 4 , 5 . On the front end portion of the quill 51 , a grindstone shaft 62 and a grindstone 15 inclined at an angle α2 with respect to the axis X of the drive shaft 52 are rotatably supported. The base end portion of the grinding wheel spindle 62 and the front end portion of the driving shaft 52 are spaced apart from each other, and the grinding wheel spindle 62 and opposite ends of the driving shaft 52 are connected in a non-contact manner by a magnetic coupling 70 .

The magnetic coupling 70 is composed of a pair of umbrella-shaped members 71, 72 that are respectively coupled to opposite ends of the drive shaft 52 and the grinding wheel shaft 62 and make the outer peripheral surfaces approach each other in a non-contact manner. Magnets 71 a and 72 a that generate magnetic force are arranged on the outer peripheral surfaces of the umbrella members 71 and 72 facing each other at a fixed pitch so that N poles and S poles alternately appear on the surfaces of the umbrella members 71 and 72 . The two umbrella members 71 and 72 are arranged close to each other without contact, and when the umbrella member 71 coupled to the drive shaft 52 rotates, the umbrella member 72 coupled to the grindstone spindle 61 is rotated by magnetic force.

According to the grinding spindle constructed in this way, the rotational power of the drive shaft 52 is transmitted to the grinding wheel shaft 62 in a non-contact manner, so even when the inclination angle α2 of the grinding wheel shaft 62 is large, no gear failure occurs. Such vibration and noise can transmit high-speed rotational power to the grindstone spindle 62 . Therefore, it is possible to easily cope with nut machining with a large lead angle.

Claims (2)

1. A grinding spindle in which the axis of rotation of a grinding wheel disposed at the front end of a quill is inclined relative to the axis of a drive shaft disposed inside the quill, wherein the drive shaft The mechanism that transmits the rotating power of the grinding wheel to the rotating shaft of the grinding wheel is provided with a magnetic coupling, which connects the opposite ends of the driving shaft and the rotating shaft in a non-contact manner and connects the drive shaft and the rotating shaft by magnetic force. Rotational power of the drive shaft is transmitted to the rotation shaft. 2. The grinding spindle according to claim 1, characterized in that the magnetic couplings are respectively coupled to the respective opposite ends of the drive shaft and the rotating shaft so that the outer peripheral surfaces are not in contact with each other. A pair of adjacent umbrella-shaped members are configured, and magnets for generating the magnetic force are arranged on outer peripheral surfaces of the umbrella-shaped members facing each other.

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