JP2919529B2 - Unbalance correction method and apparatus - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for correcting imbalance of a rotating body, and more particularly, to an unbalance method for removing unbalance of a rotating body by slot milling. The present invention relates to a balance correction method and a correction device.

<Prior Art> Various types of unbalance correction devices are known for removing an unbalance of a rotating body to obtain a desired balanced state. However, when the rotating body is a motor amateur or the like, The method of cutting by profile milling is widely and generally used. This is because the profile milling allows the outer peripheral surface of the motor armature or the like to be cut widely, and the correction can be made relatively easily even when the unbalance amount is large or when only a limited angle position can be cut.

However, if the outer peripheral surface of the motor armature is cut widely by profile milling, there is a risk of deteriorating the electric characteristics and the like of the motor. Therefore, recently, unbalance correction for a motor armature has been used not by profile milling but by slot milling for milling a predetermined angular position on a surface in a slot shape.

<Problems to be Solved by the Invention> However, when correcting the unbalance of the motor arm by slot milling, at least two or more of the limited angular positions of the surface of the armature that can be corrected by the component force correction method. Since the angular position must be corrected, the correction time becomes longer. Further, in order to shorten the correction time, the correction device must be enlarged, and there is a disadvantage that the device is large and expensive.

SUMMARY OF THE INVENTION The present invention solves such a drawback, and provides an unbalance correction method and an unbalance correction apparatus that can perform high-precision correction with relatively simple equipment so as not to impair the characteristics of the rotating body in a short correction time. The purpose is to provide.

<Means for Solving the Problems> The present invention corrects imbalance of a rotating body by simultaneously milling a plurality of locations on the rotating body surface in a slot shape using a plurality of cutter blades as one set. A method, wherein the rotating body rotates by a predetermined angle about its rotation axis, and moves by a predetermined amount in a direction perpendicular to a cutting direction at the time of milling and in a direction perpendicular to the rotation axis direction. By changing the relative positional relationship between the milling means including the cutter blades as a set of sheets and the rotating body, the position of the rotating body during milling is determined, and for the rotating body whose position has been determined, This is a method for correcting unbalance, characterized in that a plurality of slot-shaped milling are performed simultaneously by a plurality of cutter blades included in the milling means.

Further, the present invention is an unbalance correcting apparatus for milling a surface of a rotating body in a slot shape in order to correct the unbalance of the rotating body.
The above-described cutter blade, first displacement means for rotating the rotating body by a predetermined angle about the rotation axis thereof, and changing a relative positional relationship between the rotating body and the cutter blade, and a cutting direction of the cutter blade. A second displacement that displaces at least one of the rotating body and the cutter blade so that the rotating body moves by a predetermined amount in the vertical direction and in a direction orthogonal to the rotation axis direction of the rotating body, thereby changing the relative positional relationship between the two. Means for correcting imbalance.

Further, the present invention provides the imbalance correcting device,
The cutter blade includes a holding shaft, a center blade attached to the holding shaft, and a left blade and a right blade arranged symmetrically with respect to the center blade, and the rotating body and the cutter are rotated by the first displacement means and the second displacement means. By displacing the relative positional relationship with the blade, the cutting ratio of the center blade, the left blade, and the right blade during milling can be correlatedly changed.

<Operation> According to the unbalance correction method of the present invention, the relative positional relationship between the rotating body and the plurality of cutter blades included in the milling means during slot milling is determined with respect to the rotating direction and the cutting direction of the rotating body. Is determined by a combination of two displacement methods of moving vertically and in a direction orthogonal to the rotation axis direction, so that the unbalance correction angle position with respect to the rotating body can be performed by one-time positioning, and the one-time correction Correction can be performed in a short time by work.

Further, according to the unbalance correcting device of the present invention, the relative positional relationship between the rotating body for correcting the unbalance and the cutter blade is changed by the first displacement means and the second displacement means. In particular, due to the change of the positional relationship by the second displacement means,
The cutting direction of the cutter blade can be moved not in the radial direction of the rotating body (the direction toward the center of the rotating body) but in a direction parallel to the radial direction. Thus, the cutting amounts of the plurality of cutter blades can be increased or decreased in a correlated manner, and slot milling can be performed at continuous angular positions. That is, correction by the so-called null method can be performed.

According to the more preferable imbalance correcting device of the present invention,
The cutter blade has a center blade, a left blade, and a right blade, and the cutting ratio of each blade can be changed in a correlated manner.

<Example> Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

In the following description of the embodiment, as a rotating body for correcting the unbalance, a description will be given of a wound-type motor armature having a limited correctable angular position. It should be mentioned in advance that the present invention can be applied to a rotating body whose angular position is not limited, that is, has no angular position that cannot be corrected.

FIG. 3 is a perspective view of an unbalance correcting device according to one embodiment of the present invention. Referring to FIG. 3, the cutter arbor 1 is provided with a plurality of (three in this embodiment) cutter blades 2 and 3a, 3b.
The set of three cutter blades 2, 3a, 3b is symmetrical in the axial direction about the central center blade 2 as described later.

The root of the cutter arbor 1 is connected to the spindle unit 4. The spindle unit 4 is a unit that can rotate the cutter arbor 1 and slide the entire cutter arbor 1 in the arrow X direction.

A motor 5 is arranged in parallel with the spindle unit 4, and a pulley 6 m provided on the rotation shaft of the motor 5 and a pulley 6 s provided on the spindle unit 4 are connected by a tension belt 7. Accordingly, the rotational force of the motor 5 is reduced to the pulley 6m, the tension belt 7 and the pulley
, The spindle (not shown) in the spindle unit 4 is rotated, and the cutter arbor 1 is rotated.

Instead of such a structure, the motor 5 may be incorporated in the spindle unit 4 and the spindle may be directly rotated by the motor 5.

The spindle unit 4 and the motor 5 are mounted on a base 8. A slide mechanism 9 is connected to the base 8, and the slide mechanism 9 allows the base 8 to slide in the arrow Y direction and the arrow Z direction.

The slide mechanism 9 is configured by a combination of, for example, a cam mechanism, a gear mechanism, a hydraulic cylinder unit, a motor unit, and other known mechanical mechanisms.

Here, the arrow X direction, the arrow Y direction, and the arrow Z direction
They are set in directions orthogonal to each other. As a result, base 8
When the cutter arbor 1 is viewed from outside, the cutter arbor 1 can slide in X, Y and Z directions orthogonal to each other. Therefore, the three sheets 1 attached to the cutter arbor 1
The set of cutter blades 2, 3a and 3b can move three-dimensionally to any position within the sliding range of the spindle unit 4 and the base 8, respectively.

The imbalance correcting device is also provided with a clamp mechanism 10. The clamp mechanism 10 is for holding a rotating body for correcting imbalance, in this embodiment, a motor armature 11, and is provided outside the base 8.

Further, in relation to the clamp mechanism 10, the clamp mechanism 10
Is provided with a rotation control mechanism 12 that can rotate the motor armature 11 in a state where the motor armature 11 is released from being held by the motor arm 11 at an arbitrary angle in the rotation axis direction. Although not shown, the rotation control mechanism 12 includes, for example, a motor armature 11 that corrects imbalance between the rotation axes of the stepping motor and the stepping motor.
And a clutch mechanism that is connected to the rotating shaft only when necessary. The motor armature 11 rotated by a predetermined angle by the rotation control mechanism 12 is clamped by the clamp mechanism 10 and is opposed to the cutter blades 2, 3a, 3b, and the first armature between the motor armature 11 and the cutter blades 2, 3a, 3b is formed. Positioning is performed.

Also, the cutter arbor 1 is rotated by the spindle unit 4 with respect to the motor armature 11 positioned first.
Is slid in the direction of the arrow X, the second positioning of the motor armature 11 and the cutter blades 2, 3a, 3b is performed.

After the first positioning and the second positioning are performed as described above, a milling operation is performed. During the milling operation, the slide mechanism 9 moves the base 8 with the arrow Y
By moving in the direction or the arrow Z direction, the cutting length or cutting depth by the cutter blades 2, 3a, 3b can be precisely controlled.

In this embodiment, the cutter arbor 1 is moved in the arrow X direction by the spindle unit 4 to perform the second positioning. However, the slide mechanism 9 moves the entire base 8 in the arrow X direction. Is also good.

Further, the second positioning may be performed by moving the clamp mechanism 10 in the direction of the arrow X.

Furthermore, the control of the cutting length and the cutting depth during the milling operation may be performed by moving the clamp mechanism 10 in the arrow Y direction or the arrow Z direction without moving the base 8.

FIGS. 1A, 1B, and 1C are diagrams each showing a relative positional relationship between motor armature 11 and a set of three cutter blades 2, 3a, 3b during a milling operation. Such a positional relationship between the motor armature 11 and the cutter blades 2, 3a, 3b depends on the spindle unit 4, the slide mechanism 9, or the clamp mechanism 10, and the rotation control mechanism, as described above.
Done by 12.

In the positional relationship shown in FIG. 1A, the motor armature 11 and the cutter blades 2, 3a, 3b have a core 11x of the motor armature 11 cut by the center blade 2, and a core 11y by the left blade 3a and the right blade 3b, respectively. , 11z are cut.

In this case, the center of the center blade 2 (cutting direction) matches the center of the core 11x, and the center blade 2 cuts the core 11x the most. On the other hand, since the left blade 3a and the right blade 3b are symmetrical with respect to the center blade 2 and are arranged at symmetrical positions, each of the cores 11y
And the center of 11z, but in this case, double-edged 3a, 3b
Is set to be smaller than the cutting amount of the center blade 2.

Therefore, as shown in FIG. 2A, the cutting amount in this case is such that the vector X is cut by the center blade 2, the vector Y is cut by the left blade 3a, and the vector Z is cut by the right blade 3b. To the center of the core 11x of the motor amateur 11,
For example, if this is set to 0 °, the imbalance can be corrected to a maximum T if it exists in this direction.

Next, from the state shown in FIG.
Move a, 3b to the left, for example, l1, and move the motor arm 11
1B shows the relative positional relationship between the motor armature 11 and the cutter blades 2, 3a, 3b in a state in which
Shown in the figure.

Further, FIG. 1C is a diagram in which the amount of movement of the cutter blades 2, 3a, 3b and the rotation angle of the motor armature 11 are increased as compared with FIG. 1B, and the cutter blades 2, 3a, The relative positional relationship between the motor armature 11 and the cutter blades 2, 3a, 3b when the motor armature 11 is moved leftward by, for example, l2 and the motor armature 11 is rotated clockwise by θ2 is shown.

The following can be understood from the relationship between FIGS. 1A to 1C. That is, the cutter blades 2, 3a, 3b and the motor armature 1
When the relative positional relationship with 1 is changed from FIG. 1A → FIG. 1B → FIG. 1C, as shown in FIG. 2B and FIG. 2C, the cutting vector Y of the left blade 3a decreases. On the contrary, the cutting vector Z of the right blade 3b increases. And in the state of FIG. 1C,
Even if the cutting vector X of the center blade 2 reaches a predetermined maximum amount,
There is no cutting vector Y for the left blade 3a, and the cutting vector Z for the right blade 3b and the cutting vector X for the center blade 2 are equal.

The relative positional relationship between the cutter blades 2, 3a, 3 and the motor armature 11 in FIGS. 1A to 1C shows a typical example, and the relative position relationship between the cutter blades 2, 3a, 3b and the motor armature 11 is shown. The typical positional relationship can be changed in an analog-like stepless manner, and an arbitrary positional relationship can be selected.

Then, in the state of FIG. 1C, as shown in FIG. 2C, the unbalance in the intermediate angular position between the cores 11x and 11z, that is, the imbalance in the 15 ° direction can be corrected to the maximum T.

Further, from the state shown in FIG. 1A, the cutter blades 2, 3a, 3b are moved rightward and the motor armature 11 is rotated leftward, thereby correcting the imbalance of 0 ° to -15 ° (345 °). can do.

Therefore, when the cores facing the center blade 2 are sequentially changed, the unbalance correction of the motor armature 11 can be performed by slot milling at continuous angular positions by a so-called zero method in the unbalance correction.

In the above embodiment, the motor armature 11 has a 12-pole core as an example. However, if the motor armature 11 is different, the shape and dimensions of the cutter blade may be changed accordingly.

<Effect of the Invention> According to the unbalance correction method of the present invention, an unbalance correction with a short correction time and high correction accuracy can be performed.

Further, according to the unbalance correcting apparatus of the present invention, the unbalance correction can be performed at a continuous angle using a so-called null method by slot milling having a high correction accuracy,
The time required for the correction can be reduced as compared with the conventional component correction.

In addition, the configuration of the apparatus itself is not so large and does not become expensive.

Further, according to the present invention, a rotating body such as an armature of a motor that requires low noise and low vibration can be precisely unbalanced and corrected.

[Brief description of the drawings]

FIGS. 1A, 1B, and 1C are diagrams each showing a change in the relative positional relationship between the cutter blade and the motor armature. FIGS. 2A, 2B and 2C correspond to FIGS. 1A and 1B, respectively.
FIG. 11 is a vector diagram showing the unbalance correction angle position and the amount in the state of FIGS. 1B and 1C. FIG. 3 is a schematic perspective view of an unbalance correcting device according to one embodiment of the present invention. In the figure, 1 ... cutter arbor, 2, 3a, 3b ... cutter blade, 4 ... spindle unit, 8 ... base, 9 ...
Shown are a slide mechanism, 10 clamp mechanism, 11 motor armature, 12 rotation control mechanism.

Claims (3)

(57) [Claims] 1. Using a plurality of cutter blades as a set,
A method of correcting imbalance of a rotating body by simultaneously milling a plurality of portions of a rotating body surface in a slot shape, wherein the rotating body rotates a predetermined angle around its rotation axis and in a cutting direction during milling. The relative positional relationship between the milling means including a plurality of cutter blades and a rotating body is changed so that the rotating body moves by a predetermined amount in a direction perpendicular to the rotation axis direction and in a direction perpendicular to the rotation axis direction. The position of the rotating body at the time of milling is determined, and a plurality of slot-shaped milling is simultaneously performed on the determined rotating body by a plurality of cutter blades included in the milling means. How to correct the balance. 2. An unbalance correcting apparatus for milling a surface of a rotating body in a slot shape to correct the unbalance of the rotating body, comprising: at least two cutter blades having a predetermined arrangement relationship; First displacing means for rotating the rotary body by a predetermined angle about its rotation axis to change the relative positional relationship between the rotary body and the cutter blade; and rotating the rotary body in a direction perpendicular to the cutting direction of the cutter blade. So that the rotating body moves a predetermined amount in the direction orthogonal to the axial direction,
A second displacement means for displacing at least one of the rotating body and the cutter blade, thereby changing a relative positional relationship between the two. 3. The unbalance correcting device according to claim 2, wherein the cutter blade includes a holding shaft, a center blade attached to the holding shaft, and a left blade and a right blade arranged symmetrically with respect to the center blade. By displacing the relative positional relationship between the rotating body and the cutter blade by the first displacement means and the second displacement means,
An unbalance correcting device wherein a cutting ratio of a center blade, a left blade and a right blade during milling can be changed in a correlated manner.