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KR-20260064013-A - SPINDLE APPARATUS

KR20260064013AKR 20260064013 AKR20260064013 AKR 20260064013AKR-20260064013-A

Abstract

The spindle device according to the present invention comprises a spindle shaft, a spindle column through which the spindle shaft passes and which rotatably supports the spindle shaft, and a sensor installed on the spindle column, and has the advantage of being able to determine overheating or operational abnormalities using the signal of the sensor.

Inventors

  • 정효진
  • 박현섭
  • 박태성
  • 김동원
  • 원영석
  • 임은정
  • 장성현
  • 이창호

Assignees

  • 주식회사 에스비씨리니어
  • 주식회사 디엔솔루션즈

Dates

Publication Date
20260507
Application Date
20241031

Claims (14)

  1. Spindle shaft; A spindle column through which the spindle shaft passes and which rotatably supports the spindle shaft; and A spindle device comprising a sensor installed on the spindle column.
  2. In claim 1, The above spindle column is, The first spindle column and, A second spindle column spaced axially from the first spindle column, and It includes a sensoring disposed between the first spindle column and the second spindle column, and The above sensor is a spindle device installed in the above sensing ring.
  3. In claim 1, A flat portion is formed on the outer surface of the above-mentioned sensoring, and The above sensor is a spindle device installed on the above-described plane.
  4. In claim 3, An outwardly convex curved surface is further formed on the outer surface of the sensoring above, and The above planar portion and the above curved portion are formed alternately in the circumferential direction, the planar portion is formed of a plurality of planar portions, and the above curved portion is formed of a plurality of curved portions. The above sensor is a spindle device comprising a plurality of sensors each disposed in the plurality of planar portions.
  5. In claim 3, The above-described sensoring is a spindle device in which axial holes are formed on both sides of the axial direction of the portion in which the planar portion is formed, and which communicate with each other in the axial direction.
  6. In claim 5, The above-mentioned axial hole is a spindle device that penetrates a portion spaced radially inward from the sensor.
  7. In claim 3, The above-described sensoring includes a spindle device in which axial grooves are formed on each side in the axial direction of the portion in which the planar portion is formed.
  8. In claim 7, The above-mentioned axial groove is a spindle device that extends to a portion spaced radially inward from the sensor.
  9. In claim 8, A spindle device in which the ratio of the sum of the depths of the axial grooves formed on each side in the axial direction of the portion in which the above-mentioned planar portion is formed to the axial length of the sensor ring is 0.8 or less.
  10. In claim 7, A spindle device in which the axial grooves formed on each side of the axial direction of the portion in which the planar portion is formed are formed as a plurality of axial grooves spaced apart from each other in a direction parallel to the planar portion.
  11. In claim 3, The sensor installed on the above-mentioned planar portion is a spindle device equipped with a plurality of sensors.
  12. In claim 3, The above-described sensoring includes a spindle device in which a radial groove is formed on the curved surface.
  13. In claim 12, A spindle device in which the radial inner surface of the above radial groove is formed in a concave round shape.
  14. In claim 12, A spindle device in which the ratio of the depth of the radial groove to the thickness of the portion in which the curved surface is formed during the sensing is 0.8 or less.

Description

Spindle apparatus The present invention relates to a spindle device, and more specifically, to a spindle device comprising a spindle shaft and a spindle column that rotatably supports the spindle shaft. Generally, a spindle device is a device for rotating a workpiece or a tool in a machine tool, and is composed of a rotatable spindle shaft on which the tool is mounted and a spindle column that rotatably supports the spindle shaft. The spindle shaft is connected to a drive unit, such as an electric motor, and rotates relative to the spindle column by the driving force of the drive unit to rotate the tool. Korean Patent Publication No. 10-2720535 (October 22, 2024) (hereinafter referred to as the “prior art”) discloses a “fluid pressure bearing spindle.” The above prior art relates to a fluid pressure bearing spindle comprising a shaft and a housing, wherein a cylindrical bearing bushing is press-fitted into the hollow portion of the housing, and the shaft is inserted into the inner side of the bearing bushing; the housing is formed with an oil intake hole for drawing oil from an oil tank outside the fluid pressure bearing spindle and an oil passage communicating with the oil intake hole; the housing further comprises an end cover covering the motor-side end of the housing and an eccentric ring received inside the end cover while being fastened to the eccentric ring fastening portion of the shaft; a gap is formed between the outer surface of the eccentric ring and the inner surface of the end cover so that oil flows in through the oil intake hole and the oil passage, and oil from the oil tank is drawn in through the oil intake hole and the oil passage by negative pressure generated by the rotation of the eccentric ring which is fastened to the shaft and rotates; a shaft taper portion is formed on the outer surface of the shaft, and a bushing taper portion corresponding to the shaft taper portion is also formed on the inner surface of the bearing bushing. The shaft taper section and the bushing taper section are characterized by acting as a radial bearing for the vertical component of force and a thrust bearing for the horizontal component of force. In a spindle device such as the above-mentioned prior art, a large amount of heat is generated due to friction as the shaft rotates, and in this case, the rotation of the shaft must be stopped until the generated heat cools down in order to prevent damage to the spindle. However, the aforementioned conventional technology had a problem in that it was difficult to determine whether the heat was generated because a means for detecting the heat was not installed. FIG. 1 is a perspective view showing a spindle device according to a first embodiment of the present invention, FIG. 2 is a rear perspective view of FIG. 1 viewed from the opposite side, FIG. 3 is an exploded perspective view of FIG. 1, FIG. 4 is a perspective view showing the sensing illustrated in FIG. 3, FIG. 5 is a bottom perspective view of FIG. 4 viewed from the opposite side. Fig. 6 is a cutaway perspective view of Fig. 4, FIG. 7 is a perspective view showing a second embodiment of the sensing, FIG. 8 is a rear perspective view of FIG. 7, FIG. 9 is a cross-sectional view showing a cutaway perspective view of FIG. 7 and a part thereof, FIG. 10 is a perspective view showing a third embodiment of the sensing, FIG. 11 is a rear perspective view of FIG. 10, FIG. 12 is a cutaway perspective view of FIG. 10, FIG. 13 is a perspective view showing a fourth embodiment of the sensing, FIG. 14 is a rear perspective view of FIG. 13, FIG. 15 is a cross-sectional view showing the cutaway perspective view of FIG. 13 and a part thereof. Hereinafter, a spindle device according to embodiments of the present invention will be described with reference to the drawings. It should be noted that when assigning reference numerals to the components of each drawing, the same components are assigned the same reference numeral whenever possible, even if they are shown in different drawings. Furthermore, in describing the embodiments of the present invention, if it is determined that a detailed description of related known components or functions would hinder understanding of the embodiments of the present invention, such detailed description is omitted. In describing the components of the embodiments of the present invention, terms such as first, second, A, B, (a), (b), etc., may be used. These terms are intended merely to distinguish the components from other components, and the essence, order, or sequence of the components is not limited by such terms. Furthermore, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which the present invention pertains. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant techn