JPH03170827A - Method of correcting unbalance and apparatus used therefor - Google Patents

Abstract

PURPOSE:To reduce wearing of a correction jig with a prevention of possible errors in positioning as caused by friction by making an object to be measured rotate by gripping it slightly separating from the correction jig to position an unbalance point of another side thereof. CONSTITUTION:An armature A is set on an unbalance measuring/positioning device B to perform a measurement of unbalance. Based on an unbalance phase of a right side obtained, an unbalance point is positioned at a specified location and the armature A is set on a correction jig C2 of an unbalance correction device C for the right side. The armature A is cut with a cutter C1 according to an unbalance value measured. Then, the armature A is gripped with a gripper D1 of a left side positioning device D. At this point, as a distance of the jig C2 from a chuck D2 of the device D1 and a rotating shaft of a center pin D3 is larger than a radius of the armature A, the armature A separates from the jig C2. Under such a condition, the device D1 is rotated based on an unbalance phase of a left side to position on unbalance point of the left side at a specified location. Then, based on an unbalance value of the left side, the armature is cut as on the right side thereof.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a method and apparatus for correcting unbalance in a rotating body such as a rotor of an electric device.

[Conventional technology]

Conventionally, the unbalance of the object to be measured is measured, the unbalance point on one side is positioned at a predetermined position, the unbalance is corrected by placing it on a correction jig, and then the object to be measured is held and rotated. In the unbalance correction method and device in which the unbalance point on the other side is positioned at a predetermined position and the unbalance correction is performed, the object to be measured is held and rotated while it is placed on the correction jig, that is, while it is in contact with the correction jig. The position of the unbalanced point on the other side was determined by In addition, in an unbalance correction method that corrects unbalance by deleting an amount corresponding to the unbalance amount obtained by unbalance measurement from the measured object, the depth in the radial direction of the portion to be deleted is changed depending on the size of the amount to be deleted. or change the length in the axial direction of the part to be deleted. Further, by removing the same amount of unbalance obtained from the unbalance measurement from the object to be measured, the residual unbalance amount is minimized.

[Problem to be solved by the invention]

However, the conventional unbalance correction methods and devices described above have the following drawbacks. That is, if the unbalance point on the other side is determined by placing the object to be measured on the correction jig, that is, by keeping it in contact with it, gripping it, and rotating it, the friction between the correction jig and the object to be measured will cause There were problems with positioning errors and jig wear. Also, depending on the amount to be deleted, if you change the depth in the radial direction of the part to be deleted, the center of gravity will change in the depth direction, and if you change the length in the axial direction of the part to be deleted, the center of gravity will change. Since it fluctuates in the direction, it affects the corrected surface separation and requires re-measurement and re-correction. In addition, if the same amount of unbalance obtained by unbalance measurement is removed from the measured object, the residual unbalance amount will certainly be minimized, but in reality, the residual unbalance amount only needs to be below some standard amount, and is not necessary. There is no need to correct the unbalance more precisely. On the other hand, the more cutting is done, the more the cutter wears out, and the gap between the armature and stator changes, causing the magnetic balance to collapse and have negative effects. In addition, during cutting work for unbalance correction, parts of conductors such as coils that should not be cut may be accidentally removed due to positioning errors, so if a coil is shaved, stop the work immediately. However, the problem was that it was not easy to discover. In addition, the unbalance correction device is equipped with a large number of fluid pressure operated devices or electrically operated devices, so if there is a mistake in the installation of the correction jig or a chipped or worn cutter, if it is discovered late, it may cause an accident or damage. The problem was that it spread. As described above, the present invention has been made for the purpose of solving the various drawbacks and problems of conventional unbalance correcting methods and devices, and providing an unbalance correcting method and device with excellent accuracy and operability.

[Means to solve the problem]

In order to solve the above problems, in the unbalance correction method according to the present invention, when the object to be measured is held and rotated and the unbalance point is positioned at a predetermined position, the object to be measured is slightly separated from the correction jig. I made it so that I could hold it and rotate it. Furthermore, the unbalance correction device according to the present invention is provided with a gripping means for gripping and rotating the object to be measured so as to be slightly separated from the correction jig. Also, when removing the amount corresponding to the unbalance amount obtained by unbalance measurement from the measured object, the depth in the radial direction of the amount to be removed is constant, and the midpoint of the length in the axial direction of the amount to be removed is By aligning the center with a predetermined removal center, the center of gravity of the removed portion is always cut at a constant position, regardless of the amount of removal. Further, when removing from the measured object a removal amount corresponding to the unbalance amount obtained by the unbalance measurement, the removal amount is slightly larger than the amount obtained by subtracting the standard amount from the unbalance amount. The system was designed to leave a residual unbalance amount slightly smaller than the amount. In addition, in order to detect whether a conductor such as a coil that should not be cut has been accidentally shaved, the state of electrical continuity between the conductor and the cutter is monitored, and cutting is immediately stopped when electrical continuity occurs. In addition, either the fluid pressure value of the fluid pressure operated device or the current value or voltage value of the electrically operated device required for unbalance correction is compared with a standard value with a predetermined range, and correction is made if it deviates from the range of this standard value. Configured to stop working. In addition, in an unbalance correction device for correcting a rotating body in which a large number of slits are provided at equal intervals on the outer peripheral surface of the object to be measured to which cutting processing is applied for unbalance correction, the blade width w3 of the cutter for correction cutting is used. is the sum of the length w2 of the directional component of the slit width perpendicular to the positioning direction and the width wl between the slits. In addition, an unbalance correction device that corrects a rotating body with many slits at equal intervals on the outer circumferential surface of the object to be measured is subjected to cutting processing for unbalance correction. The cutting apparatus may include a detection means for detecting the amount of deviation between the center position and the center of gravity position of the part to be cut by correction, and a correction means for correcting the correction angle based on the deviation amount.

[Effect]

In the unbalance correction method according to the present invention, when the object to be measured is held and rotated and the unbalance point is positioned at a predetermined position, the object to be measured is held and rotated so as to be slightly separated from the correction jig. Therefore, no friction occurs between the object to be measured and the correction jig. Further, in the unbalance correction device according to the present invention, since a means for gripping and rotating the object to be measured so as to be slightly separated from the correction jig is provided, the object to be measured and the correction jig are separated from each other. No friction occurs. Also, when removing the amount corresponding to the unbalance amount obtained by unbalance measurement from the measured object, the depth in the radial direction of the amount to be removed is constant, and the midpoint of the length in the axial direction of the amount to be removed is By aligning the center of gravity with the predetermined removal center, the center of gravity of the removed part is always at a constant position regardless of the amount of removal, so even if the amount of removal changes, the center of gravity remains There is no change. Further, when removing from the measured object a removal amount corresponding to the unbalance amount obtained by the unbalance measurement, the removal amount is slightly larger than the amount obtained by subtracting the standard amount from the unbalance amount. Since we have arranged to leave a residual unbalance amount slightly smaller than the amount, the amount of deletion can be kept to a minimum, and corrections with unnecessary high precision will not be made. In addition, in order to detect if a conductor such as a coil that should not be shaved has been accidentally scraped, the electrical continuity between the conductor and the cutter is monitored, and cutting is immediately stopped when electrical continuity occurs. , accidents such as coil breakage and short circuits can be minimized. In addition, either the fluid pressure value of the fluid pressure operated device or the current value or voltage value of the electrically operated device required for unbalance correction is compared with a standard value with a predetermined range, and correction is made if it deviates from the range of this standard value. Since the structure was designed to stop work, if there was a mistake in the installation of the correction jig or a breakage or wear of the cutter, it would be detected immediately by changes in fluid pressure, current values, and voltage values. Stop working. In the unbalance correction device, the blade width w3 of the cutter for correction cutting is calculated by adding the length w2 of the component in the direction orthogonal to the positioning direction of the width of the slit on the outer circumferential surface of the object to be measured and the width w1 between the slits. Therefore, if the positioning error is within the width W2 of the slit, the center of gravity will not be displaced due to the positioning error, and no error will occur in the cutting operation. The present invention also includes a detection means for detecting the amount of deviation between the center position of the blade width of the cutter for correction cutting and the center of gravity position of the part to be cut by the correction, and a correction means for correcting the correction angle based on the amount of deviation. By providing this, even if the relative positions of the slit on the outer circumferential surface of the object to be measured and the cutter are different, the center of gravity of the part to be cut by correction can be maintained at a predetermined angle.

【Example】

DESCRIPTION OF THE PREFERRED EMBODIMENTS The unbalance correcting method and device thereof according to the present invention will be explained in detail below based on drawings of an unbalance correcting device according to an embodiment. Figure 1 is a schematic diagram of the unbalance correction device, Figure 2 is a side view showing only the gripping device, Figure 3 is an explanatory diagram of the cutting pattern, Figure 4 is an enlarged sectional view of the coil part, FIG. 5 is a control block diagram, and FIG. 6 is a sectional view showing the relationship between the slit on the outer peripheral surface of the armature and the width of the cutter blade. In Fig. 1, B is an unbalance measurement/positioning device, C is a right side unbalance correction device, D is a left side positioning device, E is a left side unbalance correction device,
F is a control device. In the unbalance measuring/positioning device B, the set armature A as the object to be measured is rotated, unbalance is measured, and the amount of unbalance on both left and right sides and its phase are obtained. The unbalance point is positioned at a predetermined position based on the obtained unbalance phase of the right surface. Thereafter, the armature A is set on the correction jig C2 of the right side unbalance correction device C by the conveying device without rotating it. In this right face unbalance correction device C, the armature A is shaved according to the measured unbalance amount using a cutting device equipped with a cutter CI. Next, the armature A is gripped by the gripping device DI of the left side positioning device D. At this time, as shown in FIG. 2, the distance between the chuck D2 of the gripping device D1, the rotation axis of the center bin D3, and the correction jig C2 is slightly longer than the radius of the armature A, so the gripping device D1 cannot be gripped. As a result, the armature A is separated from the correction jig C2. In this state, the gripping device Di is rotated based on the unbalanced phase of the left surface, and the unbalanced point of the left surface is positioned at a predetermined position. Then, based on the amount of unbalance on the left side, the unbalance is corrected by cutting in the same manner as on the right side. The cutting method for correcting the imbalance on both the left and right sides described above is as follows. As shown in Figure 3, regardless of the size of the unbalance,
The cutting depth should be constant. The cutting width changes depending on the amount of unbalance, but the center is always at a constant position (cutting center L.R.). The same length was cut from R to the left and right. That is, the control device F calculates the cutting start position and the cutting end position, and controls the cutter drive device. Therefore, the center of gravity of the cut portion remains constant regardless of the amount of cut. Therefore, there is no adverse effect on the corrected surface separation, and there is no need for re-measurement or re-correction. Further, as shown in FIG. 4, in these correction operations, a voltage is applied to the commutator Al and the core A2, and the value of the current flowing therein is monitored by the control device F. Commitator AI
Since the core A2 and the core A2 are insulated, no current normally flows therebetween. However, if cutter CI accidentally damages coil A3 of armature A and breaks the insulation coating, the current circuit consisting of commutator A1, coil A3, cutter CI, and core A2 will be closed, and the current value will be observed. . Therefore, the correction work is immediately stopped by a command from the control device F. Alternatively, a configuration may be adopted in which a voltage is applied to the commutator Al and the cutter CI, and the value of the current flowing therein is monitored by the control device F. In addition, as shown in Fig. 5, if there is a mistake in installation to the correction jig or damage or wear of the cutter during these positioning or correction operations, the fluid in the fluid pressure operated device V such as the cylinder may be damaged. If the pressure sensor SP or the current sensor Si of an electrically operated device M such as a motor changes beyond the standard range, this can be detected immediately by monitoring it by the control device F, so that it can be detected immediately before an accident or damage spreads. The operation of the equipment can be stopped by a command from the control device F. In addition, as shown in FIG. 6, the core A on the outer peripheral surface of the armature A
There is a slit between the two. Therefore, the width of core A2 is w
l, and when the width of the slit is w2, by setting the width W3 of the cutter CI to the sum of the width W1 of the core A2 and the slit width w2, the positioning error can be reduced to the slit width W2.
If it is within the range of , the center of gravity of the deleted part will not change,
Since the positioning error does not appear, the positioning error is allowed. This device is particularly effective in vector correction methods. As shown in FIG. 7, the relative position of the cutter CI with respect to the slit is determined by the detection device 7l between the core A2 on the outer peripheral surface of the armature A as (a), (b), (Cl,
By detecting which state is in (d) and correcting the cutting depth in the case of (a) and (b), and correcting the positioning angle in the case of (C) and (d), the same In the case of the correction amount and correction position, it is possible to correct variations after correction when only the relative position between the slit and the cutter differs.

【 Effect of the invention 】

According to the unbalance correction method of the present invention, when the object to be measured is held and rotated to position the unbalance point at a predetermined position, the object to be measured is held and rotated so as to be slightly spaced apart from the correction jig. By doing so, friction between the object to be measured and the correction jig does not occur, so that it is possible to minimize positioning errors due to friction and wear of the correction jig. Further, according to the unbalance correcting device according to the present invention, it is possible to provide an accurate unbalance correcting device with less wear due to the above-mentioned effects. In addition, when removing the amount corresponding to the amount of unbalance obtained by unbalance measurement from the measured object, regardless of the amount removed, cutting is performed so that the center of gravity of the removed portion is always at a constant position. Even if the amount changes in size, the center of gravity does not change, so it does not adversely affect the separation of the corrected surfaces, and there is no need to remeasure, resulting in the effect of improving work efficiency. In addition, when removing the amount of removal corresponding to the amount of unbalance obtained by unbalance measurement from the measured object, the amount of removal is kept to a minimum by leaving a residual amount of unbalance slightly smaller than the standard amount. This has the effect of reducing cutter wear, reducing equipment maintenance costs, and providing high-quality products. In addition, the structure monitors the continuity status between the conductor and the cutter and immediately stops cutting when continuity occurs, minimizing accidents such as coil breakage and short circuits, improving work efficiency. This has the effect of improving the quality of the product.Furthermore, it is possible to quickly discover problems with fluid pressure-operated equipment or electrically operated equipment required for unbalance correction, which has the effect of preventing the spread of damage and accidents. be. In the unbalance correction device, the blade width w3 of the cutter for correction cutting is determined by the length W2 of the width of the slit on the outer peripheral surface of the workpiece in a direction orthogonal to the positioning direction, and the width wl between the slits. By using the added width, a positioning error within the width w2 of the slit is allowed. Further, by correcting the difference in relative position between the slit and the cutter, it becomes possible to perform correction with even higher precision.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram of this unbalance correction device, Fig. 2 is a side view showing only the gripping device, Fig. 3 is an explanatory diagram of the cutting pattern, Fig. 4 (a) is a current monitoring circuit diagram, Figure 4 (
b) is an enlarged cross-sectional view of the coil part, Figure 5 is a control block diagram, Figure 6 is a cross-sectional view showing the relationship between the slit on the armature outer circumference and the cutter blade width, and Figure 7 is the slit on the armature outer circumference. FIG. 3 is a cross-sectional view showing the relationship between the relative positions of the cutter blade and the cutter blade. A: Object to be measured, A2: Core, A3: Conductor, B: Unbalance measuring device, C: Unbalance correcting device, Cl: Cutter, C2: Correction jig ,D
...Left side positioning device, DI-...Gripping means, E ・
・・Left side correction device, F ・・Control device, ■ ・・Fluid pressure actuated device, M ・・Electric actuated device, L, R・
...Deletion center, d ...Depth of the deleted part, G ...
Center of gravity of the deleted part, Sp...Fluid pressure, Si=current value or voltage value, wl...Slit interval, w2...Slit width, w3...Cutter blade width.

Claims (8)

[Claims] (1) Measure the unbalance of the object to be measured, position the unbalance point on one side at a predetermined position, place it on the correction jig and correct the unbalance, then grip and rotate the object to be measured. In the unbalance correction method, in which the unbalance point on the other side is positioned at a predetermined position, the unbalance is corrected. An unbalance correction method characterized by positioning points. (2) After measuring the unbalance of the object to be measured and correcting the unbalance by positioning the unbalance point on one side at a predetermined position and placing it on the correction jig, the object to be measured is held by the gripping means. In an unbalance correction device that corrects unbalance by gripping and rotating the object and positioning the unbalance point on the other side at a predetermined position, the gripping means grips the object to be measured so as to be slightly separated from the correction jig. 2. The unbalance correcting device according to claim 1, wherein the unbalance correcting device is a gripping means that rotates the device. (3) In the unbalance correction method, which corrects the unbalance by deleting the amount corresponding to the unbalance amount obtained by unbalance measurement from the measured object, the depth in the radial direction of the amount to be deleted is constant, and the amount to be deleted is Unbalance correction characterized by cutting so that the center of gravity of the removed part is always at a constant position, regardless of the size of the removal amount, by aligning the midpoint of the length in the axial direction with a predetermined removal center. Method. (4) An unbalance correction method in which a removed amount corresponding to the unbalance amount obtained by unbalance measurement is removed from the measured object to make the residual unbalance amount equal to or less than a predetermined standard amount, wherein the removed amount is changed from the unbalance amount to the unbalance amount. An unbalance correction method characterized by leaving a residual unbalance amount slightly smaller than the standard amount by increasing the standard amount slightly more than the amount by which the standard amount was subtracted. (5) In an unbalance correction method in which the unbalance is corrected by cutting a predetermined part other than the conductor of a measured object having a conductor such as a coil that must not be cut using a cutter that is an electrical conductor, the distance between the conductor and the cutter is An unbalance correction method characterized by minimizing damage to the conductor by monitoring the insulation condition and stopping cutting when continuity occurs. (6) In an unbalance correction method for correcting unbalance of a measured object using at least either a fluid pressure operated device or an electrically operated device, the fluid pressure value of the fluid pressure operated device or the current value or voltage of the electrically operated device An unbalance correction method characterized by comparing any of the values with a standard value having a predetermined range and stopping the correction work when the value deviates from the standard value range, thereby preventing damage to equipment. (7) In an unbalance correction device for correcting a rotating body in which a large number of slits are provided at equal intervals on the outer circumferential surface of the object to be measured, which undergoes cutting processing for unbalance correction, the blade width of the cutter for correction cutting. An unbalance correction device characterized in that w3 is a width obtained by adding a length w2 of a component of the width of the slit in a direction perpendicular to the positioning direction and a width w1 between the slits. (8) In an unbalance correction device for correcting a rotating body in which a large number of slits are provided at equal intervals on the outer circumferential surface of the object to be measured, which undergoes cutting processing for unbalance correction, the blade width of the cutter for correction cutting. and a correction means for correcting the correction angle based on the deviation amount. Correction device.