JP2004082167A - Device of correcting imbalance and high-speed rotator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device of adjusting imbalance in which an imbalance is more accurately adjusted. <P>SOLUTION: The imbalance of a rotator 1 is corrected by removing a part of a rotator 1 by irradiating the rotator 1 with laser light emitted from laser light sources 12 and 13, and a very small portion, 1 mg or less, for example, of the rotator 1 is removed by irradiating the rotator with focused laser light or pulsed laser light, thus the imbalance is accurately corrected while saving labor and time. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
BACKGROUND OF THE INVENTION
INDUSTRIAL APPLICABILITY The present invention is suitable for correcting the imbalance of a rotating body that rotates at high speed, and in particular, is used at a rotational speed exceeding 10,000 revolutions per minute. The present invention relates to an imbalance correcting device suitable for correcting an imbalance of a high-speed rotating body such as a charger, a centrifuge, and a hard disk drive, and to a high-speed rotating body with the imbalance corrected thereby.
[0002]
[Prior art]
Laser beam printer rotary polygon mirrors, turbochargers, etc. are driven at a rotational speed exceeding 10,000 revolutions per minute. Therefore, even with slight imbalances, vibrations that cannot be ignored often occur and are highly accurate. There is a problem that you have to correct the unbalance.
[0003]
FIG. 3 is a diagram for explaining a conventional imbalance correcting method for correcting the imbalance of a rotating body. Conventionally, as shown in FIG. 3, a rotating body is attached by attaching a counterweight w to a position where the shake is large with respect to the rotating body 1 and a position of 180 ° phase (referred to as an unbalance correcting portion). The overall disparity was corrected. Or, a drill or the like was used to make a hole in the unbalance correction portion to correct the unbalance of the entire rotating body.
[0004]
[Problems to be solved by the invention]
However, in the conventional imbalance correction method performed by attaching the weight w as in the past, an adhesive is used to attach the weight w, and the adhesive scatters during the rotation of the rotating body 1 and corrects with great effort. However, there was a risk that the balance would worsen. Further, it is necessary to accurately measure the amount of the adhesive used for attaching the weight w to the rotating body 1, and the efficiency of the work has been a problem.
[0005]
On the other hand, according to the method of removing a part of the rotating body with a drill or the like, there is no problem such as scattering of the adhesive, but it is difficult to correct the unbalance with high accuracy. In other words, when high-speed rotation exceeds 10,000 rotations per minute, it is required to reduce the amount of residual unbalance as much as possible. However, when drilling holes, the drill diameter and processing depth should be less than a certain value. The current situation is that it is difficult to correct and unbalance correction with high accuracy is difficult.
[0006]
For example, when a 1 mm deep hole is drilled with a drill with a drill diameter of φ1 mm, the removal amount is (0.1 / 2) 2 × π × 0.1 = 0.000785 (cm ³ ) When the density is 7.8 g / cm ³ , the mass of the removed portion is 7.8 × 0.000785 = 0.006 g (6 mg). However, in the case of high speed rotation exceeding 10,000 rotations per minute, it is necessary to correct the imbalance with a value of 1 mg or less, desirably 0.5 mg, more desirably 0.1 mg or less. However, with the removal method using a drill, it is difficult to adjust the machining depth with high accuracy, and there is a limit to correcting the unbalance with high accuracy.
[0007]
The present invention has been made in view of the problems of the prior art, and an object of the present invention is to provide an unbalance adjustment device that can perform unbalance adjustment with higher accuracy.
[0008]
[Means for Solving the Problems]
The imbalance correcting device of the first present invention comprises:
An energy source for irradiating the rotating body with a convergent beam;
By irradiating a convergent beam from the energy source, a part of the rotating body is deleted, and the imbalance of the rotating body is corrected.
[0009]
The imbalance correcting device of the second aspect of the present invention is:
A drive device for rotating the rotating body at high speed;
A measuring device for measuring the dynamic unbalanced state of the rotating body;
An energy source for irradiating the rotating body with a convergent beam;
A control device for driving and controlling the energy source,
A part of the rotating body is deleted by intermittently irradiating a convergent beam from the energy source according to the dynamic unbalance state measured by the measuring device in synchronization with the rotating rotating body. Thus, the unbalance of the rotating body is corrected.
[0010]
[Action]
According to the imbalance correcting device of the first aspect of the present invention, the rotating body has an energy source that irradiates a convergent beam, and a part of the rotating body is deleted by irradiating the convergent beam from the energy source. By doing so, the unbalance of the rotating body is corrected, and it is possible to remove the rotating body by a very small amount such as 1 mg or less by narrowing the convergent beam diameter or performing irradiation for a short time. Therefore, it is possible to correct the imbalance with high accuracy without taking time.
[0011]
Furthermore, if the energy source is a laser light source such as a carbon dioxide laser, excimer laser, or YAG laser, the output can be finely adjusted, so that the balance accuracy is improved, and the output is increased by increasing the output at the beginning of processing. This is preferable because it can be increased and the output reduced at the end of processing to reduce the removal amount and fine adjustment of the correction is possible. However, for example, an electron gun that irradiates an electron beam may be used.
[0012]
In addition, if there is an optical fiber that propagates the laser light emitted from the laser light source, laser light with high straightness can be emitted in any direction by bending the optical fiber. Increased freedom of position.
[0013]
Further, by correcting the unbalance of the rotating body by irradiating a convergent beam from the energy source and deleting at least two locations of the rotating body, it is possible to perform a more accurate correction.
[0014]
The imbalance correcting device according to the second aspect of the present invention is a drive device that rotates a rotating body at a high speed, a measuring device that measures a dynamic imbalanced state of the rotating body, and irradiates the rotating body with a convergent beam. A dynamic unbalanced state (for example, phase and amount of unbalanced) measured by the measuring device in synchronization with the rotating body that rotates, having an energy source and a control device that drives and controls the energy source; Accordingly, by intermittently irradiating a convergent beam from the energy source, the imbalance of the rotating body is corrected by deleting a part of the rotating body. Balance correction can be performed with high accuracy.
[0015]
In the case of the present invention, since the unbalance can be corrected by deleting a part of the rotating body as it is, the degree of unbalance does not change during rotation, and stable unbalance can be corrected. .
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram illustrating an imbalance correcting device according to a first embodiment. In FIG. 1, a high-speed rotating body, that is, the rotating body 1 is rotatably supported by bearings 3 and 4 with respect to the surface plate 2. The rotating body 1 is connected to a motor 6 that is a driving device via a coupling 5.
[0017]
Adjacent to the rotator 1, two vibration pickups 7 and 8 that magnetically detect the shake of the outer peripheral surface of the rotator 1 are disposed. Outputs from the vibration pickups 7 and 8 are input to a vibration measuring instrument 9 which is a measuring device for measuring the unbalanced state. The control device 10 inputs a signal from the vibration measuring instrument 9 and also inputs a signal from the phase detector 11 that detects a phase of the rotating shaft by inputting a signal from the motor 6, and based on them, an energy source A certain laser light source (YAG laser) 12, 13 is driven and controlled. The irradiation positions of the laser light sources 12 and 13 are 180 degrees out of phase with respect to the vibration pickups 7 and 8. Note that the phase signal of the rotating shaft may be detected by a detector provided outside instead of being input from the motor 6.
[0018]
The operation of this embodiment will be described. The rotating body 1 is rotated by the rotation of the motor 6. At this time, if the amount of imbalance is excessive, the rotator 1 is shaken, so that the vibration pickups 7 and 8 output a signal corresponding to the distance to the rotator 1 to the vibration measuring instrument 9. The control device 10 receives signals from the vibration measuring instrument 9 and the phase detector 11, and when the phase is shifted by 180 degrees with respect to the phase when the outer peripheral surface of the rotating body 1 is closest to the vibration pickups 7 and 8 ( In other words, the laser light sources 12 and 13 irradiate laser light with a narrowed light diameter in a pulse shape for a short time. Thereby, the outer peripheral surface of the rotating body 1 is removed at, for example, 1 mg or less, and the imbalance correction is performed with high accuracy. Since the laser beam is irradiated for a short period of time, the amount of removal of the outer peripheral surface is small, so that repeated irradiation is performed, thereby making it possible to correct with high accuracy. In addition, since the vibration balances 7 and 8 can be used to check whether or not the result of the imbalance correction is appropriate in real time after the removal, the control device 10 changes the output and irradiation time of the laser beam as necessary. Accurate imbalance correction can be performed.
[0019]
FIG. 2 is a schematic configuration diagram showing an imbalance correcting device according to the second embodiment. In the present embodiment, as shown in FIG. 2, the laser light source 12 ′, which is an energy source, is single, the laser light is propagated using four optical fibers 20, and the turbocharger is transmitted from the four outlets 21. The point which irradiates laser beam with respect to rotating bodies 1 ', such as, differs from embodiment mentioned above. The laser light propagated by each optical fiber can be turned on / off by opening / closing a shutter (not shown) individually disposed between the laser light source and the end of the optical fiber 20, for example. In the embodiment shown in FIG. 2, the driving device, the measuring device, and the control device are omitted.
[0020]
As described above, when the laser beam is irradiated through the optical fiber 20, the installation location of the laser light source 12 ′ can be arbitrarily selected, and thus the degree of freedom in designing the imbalance correcting device is improved. Further, since there is no need to install the laser light source 12 ′ adjacent to the rotating body 1 ′, workability such as attachment and removal of the rotating body 1 ′ is improved, and the overall cost can be reduced. Furthermore, since a plurality of locations can be corrected simultaneously with one laser light source, the cost of the entire apparatus can be reduced.
[0021]
As described above, the present invention has been described with reference to the embodiments. However, the present invention is not limited to these embodiments, and various modifications can be made within the scope of the technical idea of the present invention. For example, if a scanning mechanism such as a mirror is provided in the laser irradiation unit, the area and position of the removal unit in the rotating body can be adjusted. The bearing is not limited to the rolling bearing as shown in the embodiment, Also, it can be applied to a hydrodynamic slide bearing and a hydrostatic slide bearing using air or oil as a lubricant. In particular, it is preferable to use the imbalance correcting device of the present invention for a high-speed rotating body using a bearing that requires high rotational accuracy, such as a hydrodynamic sliding bearing and a hydrostatic sliding bearing, because it can correct the imbalance with high accuracy. . Further, the present invention can be used not only in a vertical rotating body in which the rotating shaft extends in the vertical direction but also in a horizontal rotating body in which the rotating shaft extends horizontally.
[0022]
【The invention's effect】
According to the imbalance correcting device of the first aspect of the present invention, the rotating body has an energy source that irradiates a convergent beam, and a part of the rotating body is deleted by irradiating the convergent beam from the energy source. By doing so, the unbalance of the rotating body is corrected, and it is possible to remove the rotating body by a very small amount such as 1 mg or less by narrowing the convergent beam diameter or performing irradiation for a short time. Therefore, it is possible to correct the imbalance with high accuracy without taking time.
[0023]
The imbalance correcting device according to the second aspect of the present invention is a drive device that rotates a rotating body at a high speed, a measuring device that measures a dynamic imbalanced state of the rotating body, and irradiates the rotating body with a convergent beam. An energy source, and a control device that drives and controls the energy source, and is converged by the energy source according to a dynamic unbalance state measured by the measuring device in synchronization with the rotating body that rotates. Since the imbalance of the rotating body is corrected by deleting a part of the rotating body by intermittently irradiating the beam, the imbalance adjustment can be performed with high accuracy while rotating the rotating body. it can.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram showing an imbalance correcting device according to a first embodiment.
FIG. 2 is a schematic configuration diagram showing an imbalance correcting device according to a second embodiment.
FIG. 3 is a diagram for explaining a conventional imbalance correcting method for correcting imbalance in a rotating body;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1, 1 'Rotating body 2 Surface plate 3, 4 Bearing 5 Coupling 6 Motor 7, 8 Vibration pick-up 9 Vibration measuring instrument 10 Control apparatus 11 Phase detector 12, 12', 13 Laser light source 20 Optical fiber

Claims (6)

An energy source for irradiating the rotating body with a convergent beam;
An imbalance correction apparatus for correcting an imbalance of the rotating body by irradiating a convergent beam from the energy source to delete a part of the rotating body. The imbalance correcting apparatus according to claim 1, wherein the energy source is a laser light source. The imbalance correction device according to claim 2, further comprising an optical fiber that propagates laser light emitted from the laser light source. 4. The imbalance of the rotating body is corrected by deleting at least two places of the rotating body by irradiating a convergent beam from the energy source. 5. Unbalance balancing device. A drive device for rotating the rotating body at high speed;
A measuring device for measuring the dynamic unbalanced state of the rotating body;
An energy source for irradiating the rotating body with a convergent beam;
A control device for driving and controlling the energy source,
A part of the rotating body is deleted by intermittently irradiating a convergent beam from the energy source in accordance with the dynamic unbalance state measured by the measuring device in synchronization with the rotating rotating body. Thus, an unbalance correction apparatus for correcting the unbalance of the rotating body. A high-speed rotating body, wherein the imbalance is corrected by the imbalance correcting device according to claim 5.

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