JP2012154671A - Balance correction device and balance correction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a balance correction device and a balance correction method for performing balance adjustment of a rotor with high accuracy upon attaining improvement of workability and shortening of work time in the balance adjustment of the rotor.SOLUTION: A balance correction device 1 correcting balance of a simple rotor T includes: a rotor support part 2 which supports the simple rotor T along which a rotation axis CL is made to follow in the vertical direction; a gas supply part 3 which supplies a high pressure air to the rotor support part 2 to rotate the simple rotor T supported by the rotor support part 2 in a floating state; a balance measurement part 4 which measures the balance of the rotating simple rotor T; two laser heads 5, 5 which irradiate the rotating simple rotor T with a laser L; and a control part 6 which irradiates excess parts BP, DP of a boss part TB of the simple rotor T and an exhaust side rotor TD, which generate imbalance, with the laser L like a pulse by operating the laser heads 5, 5 to be removed based on a measurement result from the balance measurement part 4.

Description

  The present invention relates to a balance correcting device and a balance correcting method used for correcting the balance of a rotating body.

Conventionally, as a balance correction device for correcting the balance of the rotating body described above, for example, there is an imbalance correction device described in Patent Document 1.
This unbalance correction device includes a motor that applies a rotational force to a rotating body that is rotatably supported by a bearing through a coupling, a measurement unit that measures the unbalanced state of the rotating body, and a laser beam that irradiates the rotating body. And a laser light source for removing a part of the rotating body.
In this imbalance correcting device, the measuring unit measures the imbalanced state of the rotating body, and in response to the imbalanced state, the rotating light is irradiated from the laser light source to the rotating body to remove a part thereof. Then, the imbalance of the rotating body is corrected.

JP 2004-82167 A

  However, in the above-described imbalance correction device, from the measurement of the imbalanced state of the rotating body to the removal of a part of the rotating body can be performed continuously only by once attaching the rotating body to the motor via the coupling. Therefore, although it is possible to improve the workability and shorten the work time at the time of correcting the imbalance, the rotating body is rotated for the convenience of rotating the rotating body by the rotational force transmitted from the motor through the coupling. As a result, there is a problem that it is difficult to say that the balance adjustment can be performed with high accuracy. It was an issue.

  The present invention has been made by paying attention to the above-described conventional problems. Needless to say, it is possible to improve the workability and shorten the work time when adjusting the balance of the rotating body. It is an object of the present invention to provide a balance correction apparatus and a balance correction method that can be performed in the above manner.

  In order to achieve the above-described object, the invention according to claim 1 of the present invention is a balance correcting device for correcting the balance of a rotating body, the rotating body supporting portion supporting the rotating body, and the rotating body supporting portion. A gas supply unit for supplying gas to the rotating body supported by the rotating body support unit and rotating the rotating body in a floating state or in a lubricating oil interposed state; a balance measuring unit for measuring the balance of the rotating rotating body; A laser head that irradiates the rotating body with a laser beam in a pulsed manner, and an excess of the rotating body that causes unbalance by operating the laser head based on a measurement result from the balance measuring unit It is characterized by having a control unit that irradiates the part with laser light and removes the surplus part, and the balance correction device of this structure solves the conventional problems described above It is the order of means.

In the balance correction device according to the present invention, for example, high-pressure air is used as the gas supplied to the rotating body support portion, and the rotating body operates at a high speed (for example, 4000 rpm) by supplying gas to the rotating body support portion. Rotate with. Further, the balance measuring unit is usually provided with an acceleration sensor, an angle sensor, and a calculator. Further, for example, YAG or CO ₂ can be used for the laser medium of the laser light. Furthermore, the number of laser heads that irradiate the rotating body with laser light in a pulsed manner is such that the rotating body is irradiated with laser light simultaneously from above and below, or laser light is irradiated simultaneously from above and below as well. It is desirable to arrange two or more in order to make it possible.

  Here, in correcting the balance of the rotator, the inventors of the present invention used a laser beam in order to improve the processing quality (surface roughness) of the surface of the rotator after removal of the excess portion and the removal processing speed of the excess portion. It was considered that the surface temperature of the rotating body must sufficiently exceed the boiling point of the metal during pulsed irradiation.

Therefore, an excess boiling point ratio expressed as (time exceeding boiling point / pulse time) is defined as an index indicating the degree of surplus surface temperature exceeding the boiling point of the rotating body, and the laser oscillator of the laser beam The peak boiling density (W / cm ² ) and pulse width (nsec) were varied in various ways to check the excess boiling point ratio. Since the excess boiling point ratio is expressed by a dimensionless numerical value, it is not affected by a difference in the material of the rotating body, for example, a difference between a Ni-based alloy and an iron-based alloy.

  Then, as shown in FIG. 3, the threshold value is identified from the results of parameters with good processing quality and poor parameters on the surface of the rotating body after the removal of the surplus portion, and as a result of this identification, the excess boiling point ratio is preferably 0.2 or more. Is determined to be able to improve the quality and processing speed regardless of the material of the rotating body by determining the range of the peak power density and the pulse width satisfying the condition of 0.4 or more, more preferably 0.6 or more. . There are laser oscillators that irradiate laser light that can achieve a boiling point excess ratio of 1.0. However, the material of the rotating body is limited to a part of the material, and in the case of many other materials, the laser oscillator is used. However, the present situation is that the excess boiling point ratio of 1.0 cannot be achieved. Therefore, the upper limit value of the boiling point excess ratio depends on the performance of the laser oscillator.

  That is, in the balance correction apparatus according to claim 2 of the present invention, when the pulsed irradiation of the laser beam to the surplus portion of the rotating body, as an index to the extent that the surface temperature of the surplus portion exceeds the boiling point of the rotating body , (Time exceeding the boiling point / pulse time) is defined, and the control unit sets the excess boiling point in the surplus portion of the rotating body to satisfy the condition that the excess boiling point ratio is 0.2 or more. The configuration is such that the peak power density and pulse width of the laser light irradiated in a pulsed manner are controlled.

  On the other hand, in the balance correction method according to the present invention, when correcting the balance of the rotating body, the rotating body is supported, and a gas is blown onto the rotating body to rotate the rotating body in a floating state or in a lubricating oil interposed state. On the other hand, after measuring the balance of the rotating body, based on the measurement result of the balance, irradiate the surplus portion that causes the unbalance of the rotating body to rotate in a pulsed manner, and The structure to be removed is used as a means for solving the above-described conventional problems.

In the balance correction device and the balance correction method according to the present invention, for example, if a rotating body is set in a state where the rotation axis is along the vertical direction, and a gas is blown to the rotating body to rotate in a floating state, the rotating body From the balance measurement to the removal of the excess portion of the rotating body can be performed continuously, the workability at the time of balance correction and the work time can be shortened.
In addition, the rotating body is set with the rotating shaft along the horizontal direction, and even if the rotating body is blown with a gas and lubricated, that is, rotated via a bearing, the rotating body is rotated from the balance measurement. Since the removal of the surplus part of the body can be performed continuously, the workability at the time of balance correction is improved and the work time is shortened.

  At this time, in any case, the rotating body is rotated by being blown with gas, that is, is rotated in a substantially non-contact state. As a result, the balance adjustment can be performed with high accuracy.

  In the balance correction apparatus according to claim 2 of the present invention, the peak power density and the pulse width of the laser light irradiated to the surplus portion of the rotating body are controlled so that the excess boiling ratio satisfies the condition of at least 0.2. As a result, the processing quality on the surface of the rotating body after the removal of the surplus portion and the removal processing speed of the surplus portion are improved.

  Since the balance correcting apparatus according to the present invention has the above-described configuration, it is possible to perform the balance adjustment of the rotating body with high accuracy after realizing the improvement of workability and the reduction of the working time at the time of balance adjustment of the rotating body. It has a very good effect of being possible.

It is operation | movement explanatory drawing which shows the condition which is performing balance correction of the single-piece | unit rotary body formed by joining a turbine shaft to an exhaust side rotor with the balance correction apparatus by one Example of this invention. It is operation | movement explanatory drawing which shows the condition which is performing the balance correction of the semi-assembly rotary body formed by assembling the suction side impeller to the single rotary body by the balance correction apparatus of FIG. It is a flowchart which shows the balance correction point of the single rotary body by the balance correction apparatus of FIG. It is a graph which shows the excess boiling point ratio for determining the optimal processing conditions at the time of the balance correction of the single-piece | unit rotary body and a semi-assembly rotary body by the balance correction apparatus of FIG.

Hereinafter, the present invention will be described with reference to the drawings.
1 to 4 show an embodiment of a balance correction apparatus and a balance correction method according to the present invention. In this embodiment, the balance correction apparatus and the balance correction method according to the present invention are combined with a turbine shaft as an exhaust-side rotor. A description will be given by taking as an example a case where the present invention is applied to a balance correction of a single rotating body formed by joining and a semi-assembled rotating body in which an intake side impeller is assembled to the single rotating body.

  As shown in FIG. 1, the balance correction device 1 includes a rotating body support unit 2 that supports an exhaust-side rotor TD of a single rotating body T formed by joining a turbine shaft TS to an exhaust rotor TD, and a rotating body. By blowing high-pressure air (gas) A from the supply hole 2a formed in the support part 2 to the exhaust-side rotor TD in the rotary body support part 2, the single rotary body T with the rotation axis CL along the vertical direction is in a floating state The laser beam L is moved up and down with respect to the gas supply unit 3 rotated at the same time, the balance measuring unit 4 that measures the balance of the rotating single rotating body T, and the boss portion TB and the exhaust-side rotor TD of the rotating single rotating body T. And the boss portion TB of the single rotating body T causing the unbalance by operating the laser heads 5 and 5 based on the measurement result from the balance measuring portion 4. Each extra point BP of the fine exhaust side rotor TD, and a control unit 6 for irradiating a laser beam L to the pulsed DP.

  In this case, the balance correcting apparatus 1 described above performs the balance correction of the single rotating body T, and then, as shown in FIG. 2, the intake side impeller is attached to the end of the turbine shaft TS of the balanced single rotating body T. The balance of the semi-assembled rotating body U formed by assembling the CD with the nut CB can be corrected.

  In the correction of the balance of the semi-assembled rotating body U, the laser head 5 is based on the measurement result from the balance measuring unit 4 that measures the balance of the rotating semi-assembled rotating body U as in the case of the balance correction of the single rotating body T. , 5 is operated, and the laser beam L is pulsed to the surplus portions BP and DP of the nut CB (including the turbine shaft end) and the intake-side impeller CD in the semi-assembled rotating body U that is causing imbalance. It is supposed to be irradiated.

  The balance measuring unit 4 includes an acceleration sensor, an angle sensor, and an arithmetic unit (not shown), and includes a boss portion TB and an exhaust-side rotor TD of the single rotating body T, and a nut CB and an intake-side impeller CD of the semi-assembled rotating body U. The position in the rotation direction that causes each imbalance is measured as the surplus locations BP and DP, and the unbalance amount at the surplus locations BP and DP is measured.

  The laser head 5 is a Q-switch pulse laser head, and each of the surpluses of the boss portion TB, the exhaust-side rotor TD, the nut CB, and the intake-side impeller CD at a predetermined position in the rotation direction of the single-piece rotating body T or the semi-assembled rotating body U. By irradiating the portions BP and DP with the laser beam L in a pulsed manner, the excess portions BP and DP are evaporated and removed.

  The control unit 6 controls the irradiation timing of the laser light L of the laser head 5 based on measurement results from an acceleration sensor, an angle sensor, and a calculator (not shown) of the balance measurement unit 4.

Here, a Ni-based alloy is used for the exhaust rotor TD of the single rotor T, and an iron-base alloy is used for the turbine shaft TS, while aluminum is used for the intake-side impeller CD of the semi-assembled rotor U. As in the turbine shaft TS, an iron-base alloy is used for the nut CB. In this embodiment, the control unit 6 performs a pulse of the laser beam L on the surplus portions BP and DP as shown in FIG. The peak power density (W / cm ² ) and the pulse width (nsec) of the laser light L are controlled so that the excess boiling point ratio satisfies the condition of at least 0.2 at the time of irradiation. The excess boiling point ratio is defined as an index to the extent that the surface temperature of each of the surplus locations BP and DP exceeds the boiling point of the corresponding boss portion TB, exhaust side rotor TD, nut CB, and intake side impeller CD. It is expressed by the time exceeding the boiling point / pulse time (dimensionless), and is not affected by the difference in the material of each component.

  Therefore, the balance correction procedure by the balance correction apparatus 1 will be described.

  First, after the single rotating body T is carried into the measurement processing step and the exhaust-side rotor TD of the single rotating body T is set on the rotating body support portion 2, as shown in FIG. The rotation of the single rotating body T supported by the rotating body support unit 2 is started by the supply of the high-pressure air by step S2, and in step S2, the balance measuring unit 4 balances the boss portion TB of the single rotating body T and the exhaust-side rotor TD. Measurements are made.

  In step S3, it is determined whether or not the unbalance amount of the boss portion TB of the single rotor T and the exhaust-side rotor TD is within a range allowed by the specification, and the unbalance amount is allowed by the specification. If it is within the range (Yes), the rotation of the single rotating body T is stopped by stopping the supply of high-pressure air by the gas supply unit 3, and in step S10, the work of the next process, that is, the intake side impeller CD is applied to the turbine shaft TS. Assembling work of the semi-assembled rotating body U for assembling is performed.

  On the other hand, if the unbalance amount of the boss portion TB and the exhaust rotor TD of the single rotor T is not within the allowable range in the specifications (No) in step S3, whether or not the balance can be corrected in step S4. In this step S4, when it is determined that the initial unbalance amount is large and balance correction is impossible (No), the process proceeds to step S11, where balance correction by another process is performed. When the balance is corrected in the process, the assembly work of the semi-assembled rotating body U in the next process is performed in step S10. On the other hand, if the balance cannot be corrected in another process, the process is discarded in step S12. The

  If it is determined in step S4 that the initial unbalance amount is small and balance correction is possible (Yes), in step S5, the balance measurement unit 4 starts the boss portion TB and the exhaust-side rotor TD from the single unit T. The balance correction position (excessive portion) data of both are transmitted to the control unit 6, and in this control unit 6, in step S 6, at least one of the boss portion TB and the exhaust-side rotor TD of the single rotor T In step S7, the laser heads 5 and 5 are actuated by a command from the control unit 6 to cause the unbalanced boss portion TB of the single rotating body T. And at least one of the balances by irradiating each surplus portion BP, DP of the exhaust-side rotor TD with the laser beam L in a pulsed manner. Positive is made.

  Next, in step S8, the balance measurement unit 4 performs balance measurement of the single rotating body T, and then in step S9, the unbalance amount of the boss portion TB of the single rotating body T and the exhaust-side rotor TD is allowed in the specification. When it is determined whether or not the amount is within the range and the unbalance amount is within the range allowed by the specifications (Yes), the rotation of the single rotating body T is stopped by the high-pressure air supply being stopped by the gas supply unit 3. In step S10, the assembling work of the semi-assembled rotating body U, which is the work of the next process, is performed.

  In step S9, if the unbalance amount between the boss portion TB of the single rotor T and the exhaust side rotor TD is not yet within the range allowed by the specifications (No), hereinafter, the boss portion TB and the exhaust side rotor Steps S4 to S9 are repeated until the TD unbalance amount falls within the range allowed by the specifications.

  Then, in step S10, after the assembly work of the semi-assembled rotating body U in the next process is performed, the balance correction of the semi-assembled rotating body U is performed in the same steps S2 to S12 as the balance correction of the single rotating body T. Is made.

  As described above, in the balance correcting apparatus 1 according to this embodiment, the single rotating body T is set on the rotating body support 2 with the rotation axis CL aligned in the vertical direction, and the supply hole of the rotating body support 2 is set. If the high-pressure air A is blown from 2a to the exhaust-side rotor TD in the rotating body support portion 2 and rotated in a floating state, the excess positions BP of the boss portion TB and the exhaust-side rotor TD are determined from the balance measurement of the single rotating body T. Since the removal of the DP and the balance measurement of the semi-assembled rotating body U to the removal of the surplus portions BP and DP of the nut CB and the intake-side impeller CD can be performed continuously, the workability is improved and the work is improved when the balance is corrected. Time will be shortened.

  At this time, the single rotating body T and the semi-assembled rotating body U are rotated by blowing the high-pressure air A, that is, are rotated in a non-contact state. And the semi-assembled rotating body U performs a rotating operation with almost no restraint from the rotating body support portion 2 and the like, and as a result, balance adjustment can be performed with high accuracy.

  Further, in the balance correcting apparatus 1 according to this embodiment, the peak power density and the pulse width of the laser light L irradiated to each surplus portion BP, DP are set to the control unit 6 so that the excess boiling point ratio satisfies the condition of 0.2. Therefore, the processing quality of the surfaces of the single-piece rotating body T and the semi-assembled rotating body U after the removal of the surplus portions BP and DP and the removal processing speed of the surplus portions BP and DP are improved.

  In the above-described embodiment, the case where the balance correction device and the balance correction method according to the present invention are applied to the balance correction of the single rotating body T and the semi-assembled rotating body U as a rotating body has been described as an example. It is not limited.

  Further, in the balance correcting apparatus 1 according to the above-described embodiment, the single rotating body T is set on the rotating body support 2 with the rotation axis CL aligned in the vertical direction, and the supply hole 2a of the rotating body support 2 is set. The case where the high-pressure air A is blown to the exhaust-side rotor TD in the rotating body support 2 and rotated in a floating state has been described as an example. However, the present invention is not limited to this. The single rotating body T is set on the rotating body support portion 2 in a state along the direction, and the high pressure air A is blown to the exhaust-side rotor TD in the rotating body support portion 2 so that the lubricating oil is interposed, that is, via a bearing. In this case as well, since the balance measurement of the single rotating body T and the semi-assembled rotating body U to the removal of the surplus portions BP and DP can be performed continuously, the workability at the time of balance correction is improved. Improvement So that the reduction of working time can be achieved.

  Further, in the above-described embodiments, the laser oscillator is not illustrated, but the configuration may include a laser oscillator according to the number of the laser heads 5, or the configuration including one laser oscillator for the plurality of laser heads 5. It is good.

DESCRIPTION OF SYMBOLS 1 Balance correction apparatus 2 Rotating body support part 2a Supply hole 3 Gas supply part 4 Balance measurement part 5 Laser head 6 Control part A High pressure air (gas)
BP, DP Single rotating body and each extra part of semi-assembled rotating body CB Nut CD of semi-assembled rotating body Intake side impeller CL of semi-assembled rotating body Rotating axis L of single rotating body L Laser light T Single rotating body (rotating body)
TB boss portion of single rotating body TD exhaust side rotor of single rotating body turbine shaft U of single rotating body Semi-assembled rotating body (rotating body)

Claims (3)

A balance correction device for correcting the balance of a rotating body,
A rotating body support for supporting the rotating body;
A gas supply unit configured to supply gas to the rotating body support unit and rotate the rotating body supported by the rotating body support unit;
A balance measuring unit for measuring the balance of the rotating body that rotates;
A laser head for irradiating the rotating rotating body with a laser beam in a pulsed manner;
Based on the measurement result from the balance measurement unit, the laser head is operated to irradiate a surplus portion of the rotating body that is causing unbalance to irradiate the laser beam and remove the surplus portion. A balance correction device characterized by that. When the pulsed irradiation of the laser beam to the surplus portion of the rotator is expressed as (time exceeding the boiling point / pulse time) as an index to the extent that the surface temperature of the surplus portion exceeds the boiling point of the rotator. Define the excess boiling point ratio,
The said control part controls the peak power density and pulse width of the laser beam irradiated to the surplus location of the said rotary body in a pulse form so that the said boiling point excess ratio may satisfy | fill the conditions of 0.2 or more. Balance correction device. When correcting the balance of the rotating body,
Supporting the rotating body,
While measuring the balance of the rotating body while rotating the rotating body by blowing gas to the rotating body,
A balance correction method comprising: irradiating a laser beam in a pulsed manner to an excessive portion causing an unbalance of the rotating body that rotates, based on a balance measurement result, and removing the excessive portion.

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