JP2013015472A - Unbalance correction machining method for rotor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an unbalance correction machining method capable of reducing rate of occurrence of defective products by suppressing an amount of unbalance to not larger than an allowed value even when the amount of unbalance exceeds twice the maximum machining volume for one site.SOLUTION: In the unbalance correction machining method for reducing the amount of unbalance by partially cutting and removing a part 1 to be removed off a rotor 2, the amount and direction of unbalance of the rotor 2 are measured, a virtual half-line extending from a rotation axis 3 of the rotor 2 toward the direction of unbalance is designated as the first half-line, half-lines respectively inclined from the first half-line by 60° to both sides in a circumferential direction are designated as the second and third half-lines, and when the amount of unbalance M exceeds twice the maximum machining volume Mfor one site, the maximum machining volume Mis cut and removed at each of the three sites on the first, second, and third half-lines.

Description

  The present invention relates to an unbalance correction processing method for a rotating body that cuts and removes a portion to be removed of the rotating body to reduce an unbalance amount.

  The rotating body is provided in a rotating machine and rotates about its axis. A rotating machine that is an object of the present invention is a fluid machine in which rotating blades that exert force on a fluid are provided on a rotating body. This rotating machine includes a prime mover and a driven machine. The prime mover converts the energy of the fluid into rotational kinetic energy by rotationally driving the rotating body by the pressure that the fluid acts on the rotor blades. As a prime mover, for example, there is a gas turbine (axial turbine, radial turbine). The driven machine applies rotational kinetic energy to the fluid by rotating the rotor blades that are rotationally driven to apply pressure to the fluid. Examples of the driven machine include a compressor (an axial flow compressor, a mixed flow compressor, a cross flow compressor, and a pump provided in a centrifugal compressor, an aircraft engine, or the like). Moreover, the rotary machine which is the object of the present invention includes a supercharger having both functions of a prime mover and a driven machine.

  For example, Patent Document 1 is already known as a method of measuring the unbalance of a rotating body and cutting the removal portion in correcting the balance of the rotating body of the rotating machine.

  Patent Document 1 uses the removal target portion to fix the rotating body to the rotating shaft, and even when the amount of unbalance correction and the correction direction are calculated assuming that the removal target portion is circular, The correct amount of correction can be processed without being affected, and the unbalance direction does not change due to the correction, thereby eliminating the need for re-correction and re-measurement and greatly improving the workability and yield of the correction process. An object of the present invention is to provide an apparatus and method for correcting the rotational balance of a rotating body.

  For this purpose, the vertex position of the removal target portion is detected by the vertex detector, and the correction amount and the correction direction of the unbalance obtained in advance assuming that the removal target portion is circular by the correction control device are corrected with the axis. The correction correction amount and the correction correction direction are corrected in accordance with the relative angle between the azimuth angle connecting the apexes of the removal target portion closest to the direction and the correction direction, respectively.

Japanese Unexamined Patent Application Publication No. 2009-19948, “Rotation Balance Correction Device and Method for Rotating Body”

Here, an unbalance amount (here, M) obtained by measurement in the removal target part 31 attached to the rotating body 32 as shown in FIG. When cutting along the balance direction D1, the amount that can be cut at one place is the maximum amount (here, M _max) that can cut the removal portion 34a with a cutting tool such as an end mill as shown in FIG. And so on).

Conventionally, when the unbalance amount M exceeds the maximum amount M _max that can be cut at one place, as shown in FIGS. 1C and 1D, the balance is obtained by cutting at two or three places. A correction has been made.

  In the case of FIG. 1C, two portions at the intersections of the half straight lines D2 and D3 with the unbalance orientation D1 inclined by 30 degrees on both sides and the outer periphery of the removal target portion 31 are removed as removal portions 34b and 34c, respectively. Do.

In this case, if the amount of cutting at the removal portions 34b and 34c is M _max , the amount of unbalance that can be cut at two locations is √3M _max .

  Further, in the case of FIG. 1D, three portions at the intersections of the unbalance direction D1, half straight lines D4 and D5 inclined by 60 degrees on both sides, and the outer periphery of the removal target portion 31, respectively, are removed by the removal portion 34d. , 34e and 34f are cut.

In this case, removal unit 34d, 34e, when the cutting amount respectively _{M max} at 34f, unbalance amount that can be cut at three positions _{becomes 2M max.}

However, even in the case of FIG. 1 (D), if the unbalance amount exceeds 2M _max , it is impossible to cut to eliminate the unbalance. There was a problem that it had to be.

  The present invention has been developed to solve the above-described problems. That is, an object of the present invention is to reduce the occurrence rate of defective products by suppressing the unbalance amount to an allowable value or less even when the unbalance amount exceeds twice the maximum amount that can be cut at one place. An object of the present invention is to provide a method for correcting the unbalance of a rotating body.

According to the present invention, there is an unbalance correction processing method for a rotating body that cuts and removes a portion to be removed of the rotating body to reduce an unbalance amount,
Measure the amount and direction of unbalance of the rotating body,
A virtual half line extending from the rotation axis of the rotating body toward the unbalanced direction is a first half line, and half lines inclined by 60 degrees from the first half line to both sides in the circumferential direction are respectively a second half line and a first half line. Defined as three half-lines,
When the unbalance amount exceeds twice the maximum amount that can be cut and removed at one place, the maximum amount is cut and removed at three places on the first half line, the second half line, and the third half line. An unbalance correction processing method for a rotating body is provided.

Further, according to an embodiment of the present invention, after the cutting removal, the amount and direction of the unbalance of the rotating body are re-measured,
If the remaining unbalance amount exceeds the specified tolerance,
A virtual half line extending from the rotation axis of the rotating body toward the unbalanced direction is a first half line, and half lines inclined by 60 degrees from the first half line to both sides in the circumferential direction are respectively a second half line and a first half line. Redefined as three half-lines,
The unbalance amount is removed by cutting at two places on the second half line and the third half line.

According to the method of the present invention, even when the measured unbalance amount exceeds twice the maximum amount that can be cut and removed at one place, it is on the first half line and the second half line located in the unbalance direction. And since the said maximum amount is cut and removed in three places on a 3rd half straight line, even if an unbalance amount cannot be made zero, it can reduce significantly.
Therefore, by subsequently re-measuring the amount and orientation of the unbalance of the rotating body, it is possible to increase the ratio of non-defective products whose remaining unbalance amount is less than a predetermined allowable value, and to reduce defective products.

It is a top view after the 1st cutting by a prior art. It is a block diagram of the correction processing apparatus for enforcing the method by this invention. It is a whole flowchart of the imbalance correction processing method of the rotary body by this invention.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In addition, the same code | symbol is attached | subjected to the common part in each figure, and the overlapping description is abbreviate | omitted.

FIG. 2 is a block diagram of a correction processing apparatus for carrying out the method according to the present invention.
In this figure, 1 is an object to be removed, 2 is a rotating body, 3 is a rotating shaft, 4 is a cutting tool, 6 is a control mechanism, 7 is a position controller, 8 is an angle sensor, 9 is an acceleration sensor, and 10 is supercharged. 11 is a rotating device, 12 is an arithmetic unit, 13 is a mount, and 13a is an overhanging portion.

The angle sensor 8 detects the rotation angle of the rotating body 2 and outputs the detected rotation angle to the arithmetic device 12. The rotation angle changes from zero degrees to 360 degrees when the rotating body 2 rotates once. That is, the rotation angle indicates an angle at which the rotator 2 is rotated from the rotation phase (start point rotation angle) of the rotator 2 as a predetermined start point.
The angle sensor 8 is, for example, a magnetic sensor or an image sensor, and may function in combination.

The acceleration sensor 9 detects the acceleration (that is, vibration) of the rotating body 2 while the rotating body 2 is rotating, and outputs the detected acceleration to the arithmetic device 12. The acceleration sensor 9 may be a magnetic sensor, for example.
The acceleration sensor 9 is preferably attached to the overhanging portion 13a, and more preferably located at the same height as the rotating body 2.

In this example, the supercharger 10 is supported by a mount 13, and a turbine blade (not shown) that is driven to rotate by exhaust gas from the engine, and the compressed air is supplied to the engine by rotating integrally with the turbine blade. Compressor blades.
In this example, the rotating body 2 is a rotating body in which a turbine blade and a compressor blade are connected by a connecting shaft, and the removal target portion 1 is a hexagon nut attached to one end (left end in the figure) of the connecting shaft. .

The rotating device 11 is built in the mount 13, grips one end of the rotating body 2, rotates the rotating body 2, and thereby adjusts the rotational direction position of the rotating body 2.
The rotating device 11 includes, for example, a gripping mechanism (not shown) such as a collet chuck that grips one end of the rotating body 2, a rotation driving mechanism that rotates the gripping mechanism around the rotation shaft 3 of the rotating body 2, and a rotation driving mechanism. And a control unit for adjusting the rotational direction position of the rotating body 2 by controlling the rotation.

For example, the arithmetic unit 12 generates vibration data representing the relationship between the acceleration detected by the acceleration sensor 9 and the rotation angle detected by the angle sensor 8, gives an instruction to the position control unit 7, and operates the cutting tool 4. The removal target portion 1 is partially removed by cutting.
The position to be removed by cutting is the outer peripheral portion of the removal target portion 1 (in this example, a hexagon nut), and for example, it is preferable to perform cutting at the end face of an end mill that rotates a certain position from the center of rotation.

  The mount 13 supports the rotating body 2 by a bearing (not shown), and enables vibration measurement by the acceleration sensor 9.

  FIG. 3 is an overall flow diagram of a method for correcting unbalance of a rotating body according to the present invention. In this figure, the method of the present invention comprises the steps (steps) S1 to S12.

First, the unbalance amount M and direction of the rotating body 2 are measured (S1).
Next, when cutting is the first time (YES in S2), one-point cutting (S6), two-point cutting (S7), three-point cutting (S8), 3 according to the size of the unbalance amount M. Any one of the whole part cutting (S9) is performed.

When the unbalance amount M is less than the maximum amount _{Mmax that} can be cut and removed at one place (YES in S3), the one-piece cutting (S6) causes rotation as shown in FIGS. Measure the position of the intersection of the virtual half-line (referred to as the first half-line) extending from the rotation axis 3 of the body 2 toward the direction determined by measurement and the outer periphery of the removal target part 1 (in this example, a hexagon nut). Is removed to a depth corresponding to the unbalance amount M obtained by the above. The first half line corresponds to the unbalance direction D1 in FIG.
With this cutting removal, the measured unbalance amount M is removed in the measured orientation, and the unbalance amount M after the cutting removal becomes zero or a value close to zero.

When the unbalance amount M exceeds the maximum amount M _max that can be cut and removed at one place but is less than √3M _max (YES in S4), the two places are cut (S7), as shown in FIG. In addition, the sum of vectors is obtained by measuring the intersection positions (two locations) between the two half-lines D2 and D3 inclined at 30 degrees from the first half-line to both sides in the circumferential direction and the outer periphery of the removal target portion 1. Cutting to a depth corresponding to the unbalance amount M is removed.

Similarly, when the unbalance amount M exceeds √3M _max but is less than 2M _max (YES in S5), the above-described first process is performed as shown in FIG. The intersection positions (three places) between two half lines inclined by 60 degrees from the one half line to both sides in the circumferential direction (referred to as the second half line and the third half line, respectively) and the outer periphery of the removal target part 1 are The sum is removed to a depth corresponding to the unbalance amount M obtained by measurement. In this case, the second half line and the third half line correspond to the half lines D4 and D5 in FIG.

  By the two-point cutting (S7) and the three-point cutting (S8), the measured unbalance amount M is removed in the measured direction, and the unbalance amount M after the removal of cutting is zero or close to zero. Value.

When the unbalance amount M exceeds 2M _max (NO in S5), the same part as the three-point cutting (S8), that is, the first half-line and the second half-line, by the three-point full cutting (S9). And the maximum amount _Mmax that can be cut and removed at one place at three places on the third half line is removed by cutting.
In this three-point all cutting (S9), the amount corresponding to the measured unbalance amount M is not cut and removed, but the amount exceeding 2M _max in the measured orientation is removed, and the unbalance amount is reduced. Even if it cannot be reduced to zero, it can be greatly reduced.

In FIG. 3, after performing any one of the one-point cutting (S6), the two-point cutting (S7), the three-point cutting (S8), and the three-point all cutting (S9), the unbalance amount M of the rotating body 2 The direction is re-measured (S1).
In the case of one-point cutting (S6), two-point cutting (S7), and three-point cutting (S8), the unbalance amount M after the cutting removal is zero or a value close to zero. The measurement (S1) may be omitted and all non-defective products (unbalance corrected) may be used.

  Next, when the cutting is the second time (NO in S2), the above-described two-point cutting (S7) is performed regardless of the unbalance amount M. In addition, you may use together one place cutting (S6) here.

Next, the unbalance amount M and orientation of the rotating body 2 are remeasured (S11), and the remeasured unbalance amount M is compared with a preset allowable value α (S12).
In S12, if the unbalance amount M is less than the allowable value α, it is determined as a non-defective product (unbalance corrected), and if the unbalance amount M exceeds the allowable value α, it is determined as a defective product and the correction process is terminated. .

According to the above-described method of the present invention, even when the measured unbalance amount M exceeds twice the maximum amount M _{max that} can be cut and removed at one place, the first half-line located in the unbalance direction, Since the maximum amount _Mmax is cut and removed at three locations on the second half line and the third half line, even if the unbalance amount cannot be reduced to zero, it can be greatly reduced.
Therefore, by subsequently re-measuring the amount and direction of unbalance of the rotating body 2, it is possible to increase the ratio of non-defective products in which the remaining unbalance amount M is less than a predetermined allowable value and reduce defective products.

  In addition, this invention is not limited to embodiment mentioned above, is shown by description of a claim, and also includes all the changes within the meaning and range equivalent to description of a claim.

1 part to be removed, 2 rotating body, 3 rotating shaft, 4 cutting tool,
6 control mechanism, 7 position control unit, 8 angle sensor,
9 Acceleration sensor, 10 Supercharger, 11 Rotating device, 12 Arithmetic device,
13 mount, 13a overhang,
31 removal target part, 32 rotating body,
33 Rotating shaft, 34a to 34f Removal section

Claims (2)

An unbalance correction processing method for a rotating body that reduces the unbalance amount by partially removing a removal target portion of the rotating body,
Measure the amount and direction of unbalance of the rotating body,
A virtual half line extending from the rotation axis of the rotating body toward the unbalanced direction is a first half line, and half lines inclined by 60 degrees from the first half line to both sides in the circumferential direction are respectively a second half line and a first half line. Defined as three half-lines,
When the unbalance amount exceeds twice the maximum amount that can be cut and removed at one place, the maximum amount is cut and removed at three places on the first half line, the second half line, and the third half line. An unbalance correction processing method for a rotating body, characterized in that: After removing the cutting, remeasure the amount and orientation of the unbalance of the rotating body,
If the remaining unbalance amount exceeds the specified tolerance,
A virtual half line extending from the rotation axis of the rotating body toward the unbalanced direction is a first half line, and half lines inclined by 60 degrees from the first half line to both sides in the circumferential direction are respectively a second half line and a first half line. Redefined as three half-lines,
The unbalance correction processing method for a rotating body according to claim 1, wherein the unbalance amount is removed by cutting at two locations on the second half line and the third half line.