JP5729645B2 - Unbalance correction method for rotating body - Google Patents

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.

FIG. 1 is a configuration example of a rotating machine. In this example, the rotating machine is a supercharger.
In this figure, the rotating body 41 has a compressor blade 43, a turbine blade 45, and a rotating shaft 47 that couples both. In FIG. 1, a nut 49 is screwed into the axial end of the rotating body 41, and the compressor blade 43 is fastened to the rotating shaft 47 by tightening the nut 49.

  In the conventional unbalance correction, the unbalance of the rotating body 41 is measured, and at the circumferential position where the unbalance exists (position related to the direction around the central axis of the rotating body), an amount corresponding to the size of the unbalance, The removal target part (for example, nut 49) in the rotating body 41 was partially cut.

In addition, there exist the following patent documents 1 and 2 as a prior art document of this application.
In Patent Document 1, the rotor disk is fixed to the other end of the rotating shaft, and the rotor disk is shaved to correct the unbalance of the rotating body.
Patent Document 2 describes an unbalance measurement method.

JP 2006-022771 A, “Turbo Molecular Pump” JP 2010-048588 A, “Method and apparatus for calculating unbalance amount of rotating body”

  In FIG. 1, the compressor blade 43 includes a plurality of blade portions 43a and a blade coupling portion 43b that couples the blade portions 43a in the circumferential direction. A region of the blade coupling portion 43b that does not overlap the blade portion 43a when viewed from the axial direction is referred to as a “water web portion”.

When the unbalance amount is corrected by partially removing the compressor blade 43 by cutting, the “water web portion” of the compressor blade 43 can be the removal target portion.
However, since the webbed part is located between the wing parts 43a, the position where cutting and removal can be performed is limited. Moreover, since the thickness (axial thickness) of a web part is thin, the maximum amount (mass) which can be cut about one place is restrict | limited.

  Therefore, as a result of the unbalance measurement of the rotating body, there is a problem that the unbalance amount cannot be corrected when the unbalance amount to be corrected exceeds the maximum amount that can be cut at one place.

  The present invention has been developed to solve the above-described problems. That is, an object of the present invention is to provide a rotating body unbalance correction processing method capable of correcting an unbalance amount even when the unbalance amount exceeds a maximum amount that can be cut at one place.

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,
(A) Set a plurality of cutting removal parts at a certain angle in the circumferential direction in the removal target part of the rotating body,
(B) Measure an unbalance vector indicating the amount and orientation of the unbalance of the rotating body,
(C) dividing the unbalance vector into divided vectors in a pair of cutting removal portions located on both sides of the orientation;
(D) When the unbalance amount corresponding to each of the divided vectors exceeds the maximum amount that can be cut and removed with respect to the corresponding cut and removed portion, the entire divided vector in the pair of cut and removed portions located on both sides of the direction Subdivide into split vectors,
(E) Repeat the re-division until all of the unbalance amounts corresponding to the division vectors are equal to or less than the maximum amount that can be removed with respect to the corresponding cut-off portion,
(F) wherein a plurality of cutting and removing portions corresponding to the respective split vector cutting and removing the respective unbalance amount, the unbalance correction processing method of the rotating body, characterized in that there is provided.

According to an embodiment of the present invention, in the subdivision,
Wherein the sum of the split vector coincides with the unbalance vector of the rotating body,
On the condition that the cumulative amount of cutting removal in each cutting removal part is not more than the maximum amount that can be cut and removed for one place,
The minimization problem that minimizes the sum of the unbalance amounts corresponding to the respective divided vectors is sequentially solved by quadratic programming.

  According to the method of the present invention, the unbalance vector indicating the amount and orientation of the unbalance of the rotating body is divided into the divided vectors in the pair of cutting removal portions located on both sides of the orientation. Even when the amount exceeds the maximum amount that can be cut at one place, the unbalance amount of the rotating body is obtained by cutting and removing the pair of cutting removal portions located on both sides of the azimuth with the respective unbalance amounts. Can be corrected.

  In addition, even when the unbalance amount corresponding to the pair of divided vectors exceeds the maximum amount that can be cut and removed with respect to the corresponding cut and removed portion, the divided vector is divided at the pair of cut and removed portions located on both sides of the direction. Subdivision is repeated until the unbalanced amount corresponding to each divided vector is equal to or less than the maximum amount that can be removed with respect to the corresponding cutout removal portion. By removing by cutting, a larger unbalance amount can be corrected.

In addition, since the unbalance amount corresponding to each divided vector is set to be equal to or less than the maximum amount that can be cut and removed for the corresponding cut and removed portion, even when unbalance measurement and cutting and removal are repeated, Since the cutting amount is calculated including the previous cutting amount, multiple cuttings are possible.

It is the schematic which shows the supercharger as an example of a rotary machine. It is a block diagram of the balance correction apparatus to which the method of this invention is applied. It is a whole flowchart of the imbalance correction processing method by this invention. It is a schematic diagram of the unbalance correction processing method 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 balance correction apparatus to which the method of the present invention is applied.
The balance correcting device 10 is a device that corrects an unbalance existing in the rotating body 5 by partially removing (cutting in this example) the rotating blades 5 a of the rotating body 5 provided in the rotating machine 3. .

  In the following, the direction around the central axis C of the rotating body 5 is simply referred to as the circumferential direction, the radial direction with respect to the central axis C is simply referred to as the radial direction, and the direction parallel to the central axis C is simply referred to as the axial direction.

The rotary blade 5a includes a plurality of blade portions 7 arranged at intervals in the circumferential direction, and a blade coupling portion 9 extending in the circumferential direction so as to couple the plurality of blade portions 7 in the circumferential direction.
The rotary blade 5a has a plate shape having a thickness in the axial direction, and is circular when viewed from the axial direction. Further, the housing (the compressor housing in this example) that accommodates the rotary blade 5a is removed.
In FIG. 1, the rotary machine 3 is a supercharger, the rotary blade 5 a is a compressor impeller, and the blade portion 7 is a compressor blade.

[Configuration of turbocharger]
The rotating body 5 of the supercharger 3 includes a turbine blade 13 that is rotationally driven by exhaust gas from the engine, a compressor blade (rotary blade 5a) that supplies compressed air to the engine by rotating integrally with the turbine blade 13, A turbine blade 13 is coupled to one end, and a rotating shaft 15 is coupled to the other end of the compressor blade.

  The supercharger 3 includes the above-described compressor housing (not shown), the turbine housing 14, and the bearing housing 19.

  The turbine housing 14 accommodates the turbine blade 13 therein. The turbine housing 14 is formed with a flow path (scroll) through which a fluid for rotationally driving the turbine blades 13 flows. The turbine housing 14 is attached to the inside of the support body 21 in this example.

  A bearing 17 that rotatably supports the rotating body 5 is incorporated in the bearing housing 19. In this example, the bearing housing 19 is attached to the support 21. Thereby, the support body 21 supports the rotary body 5 rotatably via the bearing housing 19.

[Configuration of balance correction device]
The balance correction device 10 includes a calculation unit 23 and a processing device 25.

  When the calculation unit 23 corrects the balance by partially cutting and removing the blade coupling portion 9 of the rotary blade 5a, the calculation unit 23 moves the blade to the unbalanced circumferential position of the rotary body 5 at the outer peripheral portion of the rotary blade 5a. When the part 7 is located, the unbalance is decomposed into unbalance components at a plurality of circumferential positions where the wing part 7 is not located.

  The processing device 25 partially cuts and removes the blade coupling portion 9 by an amount corresponding to the corresponding unbalance component at each of the plurality of circumferential positions.

  The processing device 25 includes a processing tool 25a (for example, an end mill) that cuts the blade coupling portion 9 of the rotary blade 5a, a movable portion 25b to which the processing tool 25a is attached, and a cutting control unit 25c that moves the movable portion 25b. .

  In addition, the processing device 25 includes a positioning device 25d. The positioning device 25d grips the end of the rotating body 5 and rotates the rotating body 5 in this state so that the rotating body 5 is rotated so that the rotation angle detected by the rotation angle sensor 29 becomes a set value (for example, zero degrees). Position. In the example shown in the figure, the positioning device 25d grips the end opposite to the rotary blade 5a through the exhaust hole 21a formed in the support 21.

  The balance correction device 10 includes a rotation angle sensor 29 and a data processing unit 32 in order to obtain a range of a circumferential position where the wing portion 7 exists in the rotating body 5.

  The rotation angle sensor 29 detects a rotation angle (a rotation angle of 0 degrees to 360 degrees) indicating the amount of rotation of the rotating body 5 from the initial state. The rotation angle sensor 29 may be, for example, a magnetic sensor that detects a magnetic field generated by an axial end portion of the magnetized compressor blade 7 side. In this case, since the magnetic field changes according to the rotation of the rotating body 5, the magnetic sensor 29 can detect the rotation angle of the rotating body 5 based on this change.

  Based on the detection data from the rotation angle sensor 29, the data processing unit 32 obtains the range of the circumferential position where the wing portion 7 exists in the rotating body 5 as in step S1 described later.

  FIG. 3 is an overall flowchart of the unbalance correction processing method according to the present invention, and FIG. 4 is a schematic diagram of the unbalance correction processing method according to the present invention.

  As shown in FIG. 3, the method of the present invention includes steps (steps) S1 to S8.

In the method of the present invention, first, as shown in FIG. 4 (A), a plurality of (12 in this example, 12 locations) spaced apart from each other by a certain angle in the circumferential direction. ) Is set (S1).
The circumferential angle of each cutting removal unit 1 from the circumferential reference position (not shown) of the rotating body 5 is defined as θ1 to θn (n is an integer, 12 in this example).

Next, in S2, an unbalance vector U (refer to FIG. 4B) indicating the unbalance amount M and the azimuth θ of the rotating body 5 is measured. In this case, the unbalance vector U can be expressed by the following equation (1).
U = Me ^iθ (1)

Next, in S3, the measured unbalance vector U is divided into divided vectors u _k and u _{k + 1} in a pair of cutting removal units 1 located on both sides of the direction θ.
In this case, the unbalance vector U can be expressed by the following equation (2). Here, θ _k and θ _{k + 1} are the angles of the cutting removal unit 1 located on both sides of the azimuth θ, and m _K and m _{K + 1} are the unbalance amounts of the cutting removal unit 1 located in the azimuth θ _k and θ _{k + 1.} .
_{U = u K + u K +} 1 = m K e iθK + m K + 1 e iθK + 1 ··· (2)

From the above (1) and (2), the unbalance amounts m _K and m _{K + 1} in the directions θ _k and θ _{k + 1} can be obtained.

Next, when the determined unbalance amounts m _K and m _{K + 1} are equal to or less than the maximum amount M _{max that} can be cut and removed for the corresponding cutting and removing unit 1 (YES in S4), in S6, each of the divided vectors u _k and u _{k + 1} corresponds. The plurality of cutting and removing portions 1 to be cut are removed by the respective unbalance amounts m _K and m _{K + 1} .
Here, the maximum amount M _max that can be cut and removed for the corresponding cut and removed portion 1 is the amount of cut and removed by each of the cut and removed portions 1 when the cut and removed are already performed once or more for the same cut and removed portion 1. Is set to be equal to or less than the maximum amount that can be removed by cutting at one location.

In S4, when the obtained unbalance amounts m _K and m _{K + 1} exceed the maximum amount M _max that can be cut and removed with respect to the corresponding cutting remover 1 (NO in S4), in S5, the divided vectors u _k and u _{k + 1} are assigned their orientations. Are subdivided into division vectors in a pair of cutting removal units 1 located on both sides of the substrate (see FIG. 4C).
That is, when the unbalance amount _{m K} exceeds the maximum amount _{M max,} subdivided split vector _{u k} to split vector _{u k-1, u k + 1} in the cutting and removing portions 1 of a pair located on opposite sides of its orientation, Unbalance amounts m _K−1 , m _K , and m _{K + 1} of the directions θ _k−1 , θ _k , and θ _{k +} 1 are _obtained .
Similarly, when the unbalance amount m _{K + 1} exceeds the maximum amount M _max , the divided vector u _{k + 1} is subdivided into divided vectors u _k and u _{k + 2} in a pair of cutting removal units 1 located on both sides of the direction, and the direction Unbalance amounts m _K , m _{K + 1} , and m _{K + 2} of θ _k , θ _{k + 1} , and θ _{k + 2} are _obtained .
The same applies when both the unbalance amounts m _K and m _{K + 1} exceed. Moreover, the unbalance amount by the re-division is added to the unbalance amount of the corresponding azimuth.

Next, returning to S4, the obtained unbalance amounts m _K−1 , m _K , m _{K + 1} , m _{K + 2} are compared with the maximum amount M _max that can be cut and removed for the corresponding cut removal portion 1.
When all of the unbalance amounts m _K−1 , m _K , m _{K + 1} , and m _{K + 2} are equal to or less than the maximum amount M _max (YES in S4), the above-described S6 is performed.

Further, when any of the unbalance amounts m _K−1 , m _K , m _{K + 1} , m _{K + 2} exceeds the maximum amount M _max (NO in S4), the above-described subdivision in S5 is performed as an uncorresponding to each division vector. The process is repeated until the balance amount is equal to or less than the maximum amount that can be removed with respect to the corresponding cut-off portion.

The re-division in S5 is performed with respect to the measured azimuth θ of the unbalance vector U so that the azimuth θ _{l of the} division vector is in the range of θ + 90 ° <θl <θ−90 °. If this range is exceeded, unbalance correction cannot be performed.

Further, if the re-division (S5) is repeated, it becomes difficult to calculate a plurality of imbalance amounts _mi (i = 1, 2,...). In that case, the sum of the unbalance amounts _mi (i = 1, 2,...) Corresponding to the respective divided vectors u _i (i = 1, 2,...) Under the following conditions (1) and (2). The minimization problem that minimizes Σmi can be solved by sequential quadratic programming.
(1) The sum Σu _{i of} each divided vector u _i (i = 1, 2,...) Matches the unbalance vector U of the rotating body 5.
(2) The cumulative amount of cutting removal in each cutting removal unit 1 is equal to or less than the maximum amount _{Mmax that} can be cut and removed at one place.

In S6, the plurality of cutting removal portions 1 corresponding to the respective divided vectors u _i (i = 1, 2,...) Are removed by the respective unbalance amounts m _i (i = 1, 2,...). By this cutting and removal, the unbalance of the rotating body 5 is corrected.

  Next, in this example, in order to confirm the correction result, the unbalance vector U is remeasured (S7). When the unbalance M is equal to or greater than the predetermined allowable value α (NO in S12), the above-described S3 to S6 are performed. If the unbalance M is less than the predetermined allowable value α (YES in S12), the correction is terminated.

According to the above-described method of the present invention, the unbalance vector U indicating the unbalance amount and orientation of the rotating body 5 is divided into the divided vectors u _k and u _{k + 1} in the pair of cutting removal units 1 located on both sides of the orientation. Even if the unbalanced amount of the rotating body 5 exceeds the maximum amount _Mmax that can be cut at one location, the pair of cutting removal units 1 located on both sides of the azimuth are separated by the respective unbalanced amounts. By cutting and removing with m _K and m _{K + 1} , the unbalance amount of the rotating body 5 can be corrected.

Even when the unbalance amounts m _K and m _{K + 1} corresponding to the pair of divided vectors u _k and u _{k + 1} exceed the maximum amount M _max that can be removed by cutting with respect to the corresponding cut removing unit 1, the divided vectors u _k , u _{k + 1} is subdivided into divided vectors u _{k−1 to} u _{k + 2} in a pair of cutting removal units 1 located on both sides of the direction, and unbalance amounts m _{K−1 to} m _{K + 2} corresponding to the divided vectors correspond to each other. Since the re-division is repeated until the cutting removal portion 1 to be cut is less than or equal to the maximum amount _{Mmax that} can be removed by cutting, the three or more cutting removal portions 1 are cut and removed by the respective unbalance amounts, so that a larger unbalance amount can be obtained. Can be modified.

In addition, since the unbalance amount corresponding to each divided vector is set to be equal to or less than the maximum amount _{Mmax that} can be removed for the corresponding cut removal unit, even when unbalance measurement and cut removal are repeated, the same cut removal Since the cutting amount in the part 1 is calculated including the previous cutting amount, a plurality of cuttings are possible.

  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 cutting removal unit, 3 rotating machine, 5 rotating body, 5a rotating blade,
7 wing parts, 9 wing joint parts, 10 balance correction device,
13 turbine blades, 14 turbine housing,
15 rotating shaft, 17 bearing, 19 bearing housing,
21 support body, 21a exhaust hole, 23 calculating part,
25 processing apparatus, 25a processing tool, 25b movable part,
25c cutting control unit, 25d positioning device,
29 rotation angle sensor, 32 data processing unit,
41 rotating body, 43 compressor blades,
43a wing part, 43b wing joint part,
45 Turbine blade, 47 Rotating shaft, 49 Nut

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,
(A) Set a plurality of cutting removal parts at a certain angle in the circumferential direction in the removal target part of the rotating body,
(B) Measure an unbalance vector indicating the amount and orientation of the unbalance of the rotating body,
(C) dividing the unbalance vector into divided vectors in a pair of cutting removal portions located on both sides of the orientation;
(D) When the unbalance amount corresponding to each of the divided vectors exceeds the maximum amount that can be cut and removed with respect to the corresponding cut and removed portion, the entire divided vector in the pair of cut and removed portions located on both sides of the direction Subdivide into split vectors,
(E) Repeat the re-division until all of the unbalance amounts corresponding to the division vectors are equal to or less than the maximum amount that can be removed with respect to the corresponding cut-off portion,
(F) An unbalance correction processing method for a rotating body, wherein a plurality of cutting removal portions corresponding to the respective divided vectors are cut and removed by respective unbalance amounts. In the subdivision,
Wherein the sum of the split vector coincides with the unbalance vector of the rotating body,
On the condition that the cumulative amount of cutting removal in each cutting removal part is not more than the maximum amount that can be cut and removed for one place,
2. The rotating body unbalance correction processing method according to claim 1, wherein a minimization problem for minimizing a total sum of unbalance amounts corresponding to the respective divided vectors is sequentially solved by quadratic programming.