JPH054016B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an unbalance correcting device for correcting the unbalance of a rotating body by welding.

[Conventional technology]

Conventionally, an unbalance correction device that uses arc welding to correct the unbalance of a rotating body has been proposed. At the same time, the balance correction vertical weight closest to the measured unbalance amount is selected and welded using an arc welding machine.

That is, as shown in FIG. 10, pick-ups 1 and 2 for detecting unbalance are provided to detect unbalance of a rotating body (workpiece) not shown. To explain further, the signals X and Y from the pickups 1 and 2 and the synchronization signals X ₀ and Y ₀ from the synchronization signal generators 3 and 4 are input to the unbalance measuring section 5, where the position of the unbalance is determined. (Angle) Θ and the unbalance amount W are calculated, and these are further synthesized by a vector synthesis amplifier 6. The results are displayed on the quantity meter 7 and the angle meter 8, and at the same time, the automatic stop device 9 Unbalance position (position displayed on angle meter 8)
It is designed to stop when the position coincides with a certain position (for example, the position of the correction device). Further, the unbalance amount signal is sent to a weight selection section 10, and the one having the closest value among the prepared correction weights is selected and displayed by a lamp or the like. The worker then takes out the weight where the lamp is lit and welds it.

A method has also been proposed in which a long band-shaped weight for balance correction is prepared, and the weight is cut by an amount equal to the measured amount of unbalance and then welded.

[Problem that the invention seeks to solve]

However, in the former conventional example described above, it is necessary to prepare many types of balance correction weights in advance, and the amount used varies depending on the weight, so the amount of remaining weights must be constantly monitored. must be replenished. Furthermore, these weights for correcting unbalance must always be placed within easy reach near the unbalance correcting device, which requires a larger space.

Furthermore, since the weight for unbalance correction is selected and attached to the one closest to the measured value, it is not possible to completely correct the unbalance, and it is generally not possible to use it for highly accurate unbalance correction. There are also problems.

In addition, in the latter conventional example mentioned above, there is no need to prepare several types of unbalance correction weights, so although it is improved in terms of space, if the amount of correction is small, it may be cut into small pieces. In addition to this, the amount of welding rod used during welding is not constant, and in the case of spot welding, the weight becomes heavy due to burrs and deformation during cutting. There is a risk that the weight may not come into close contact with the rotating body, and as a result, there is a risk that the weight may fall off after the rotating body is assembled into the device.

Further, in any of the conventional examples, a supporting plate is required under the welding point during welding, which causes problems such as complicating the structure.

The present invention aims to solve these problems, and provides an unbalance correction device for a rotating body that overcomes the problems of unbalance correction by welding and also automates the correction work. The purpose is to provide

[Means for solving problems]

Therefore, the unbalance correction device for a rotating body of the present invention includes an unbalance measuring means for measuring unbalance vector information of the rotating body, and a welding unit capable of performing unbalance correction welding at the unbalance correction position of the rotating body. means, and position adjustment means for adjusting the relative positional relationship between the unbalance correction position of the rotary body and the welding end of the welding means, the amount of unbalance measured by the unbalance measuring means and the amount of unbalance measured in advance by the unbalance measuring means. A comparison means for comparing the set value with the set value, and when the comparison means determines that the unbalance amount is larger than the set value, a plurality of unbalance correction positions are set, and each unbalance correction is performed. Calculating means for calculating the amount of unbalance to be corrected for each position is provided, and core wire feeding means for supplying the welding core wire to the welding end of the welding means is provided,
In order to make the unbalance correction position of the rotating body face the welding end, when the unbalance amount is less than the set value, the unbalance amount is adjusted to the set value based on the measurement result from the unbalance measuring means. A position adjustment control means is provided which outputs a position adjustment control signal to the position adjustment means based on the calculation result from the calculation means when the amount of unbalance is less than the set value. Based on the measurement results from the unbalance measuring means, if the unbalance amount is larger than the set value, the control signal for core wire feeding and the control signal for welding are respectively applied to the core wires based on the calculation results from the calculation means. It is characterized by being provided with a welding control means for outputting to the feeding means and the welding means.

[Effect]

In the above-mentioned unbalance correction device for a rotating body of the present invention, when the unbalance amount is less than the set value, welding is performed at the unbalance position based on the measurement result from the unbalance measuring means. On the other hand, when the unbalance amount is larger than the set value, the unbalance amount to be corrected calculated for each unbalance correction position is applied to multiple unbalance correction positions based on the calculation results from the calculation means. Welding is performed.

〔Example〕

Hereinafter, an unbalance correction device for a rotating body as an embodiment of the present invention will be explained with reference to the drawings.
Fig. 1 is a block diagram showing its schematic configuration, Fig. 2 is a schematic diagram showing the arrangement of the welding robot, Fig. 3 is a schematic diagram illustrating distributed unbalance correction positions, Fig. 4 is a schematic diagram showing the arrangement of the welding robot, 5 are schematic diagrams showing the welded shapes, and in FIG. 1, the same reference numerals as in FIG. 10 indicate almost the same parts.

As shown in FIG. 1, an unbalance measuring device 11 for measuring unbalance vector information (W, Θ) of a rotating body (work) is provided, and this unbalance measuring device 11 is similar to the conventional one. , an unbalance measuring section 5 which calculates the unbalance position (angle) Θ and the unbalance amount W from the signals X, Y from the pickups 1, 2 and the synchronizing signals X ₀ , Y ₀ from the synchronous signal generators 3, 4. and a vector synthesis amplifier 6 for synthesizing the signals from the unbalance measurement section 5.

Further, as shown in FIG. 2, an arc welding machine 13 capable of performing unbalance correction welding by arc welding is provided at the unbalance correction position of the workpiece 12, and an arc welding end 13 of the welding machine 13 is provided.
A core wire feeding mechanism 15 is provided to supply the welding core wire 14 to the vicinity of a, and a welding robot is constituted by the welding machine 13, the core wire feeding mechanism 15, and the like.

Here, the welding machine 13 is supported by a base member 16 so as to hang downward, for example, and the arc welding end 13 is driven by a welding machine drive motor (not shown).
A is designed to move up and down. Further, when the welding machine 13 receives a trigger signal, it is configured to be able to flow a welding current to the welding end portion 13a. moreover,
A feed guide portion 17 for the welding core wire 14 is provided near the arc welding end portion 13a.

The core wire feeding mechanism 15 includes rollers 15a and 15b (these rollers 15
At least one of a and 15b is a drive roller), and the drive roller is driven by a feed motor (not shown).

The welding core wire 14 is wound into a roll and is used while being unrolled one after another.

Further, an automatic stop device 18 is provided as a position adjustment means for adjusting the relative positional relationship between the unbalance correction position of the work 12 and the welding end 13a of the welding machine 13 by rotating the work 12. The automatic stop device 18 has a work rotation motor 19 that rotates the work 12.

By the way, the unbalance amount W measured by the unbalance measuring device 11 and the preset setting value
A comparator 20 for comparing Ws and this comparator 20
The unbalance amount W measured by is the set value Ws
If it is determined that the unbalance correction position is larger than An arithmetic circuit 21 for performing calculations is provided. Note that an example of calculation by the calculation circuit 21 will be described later.

Furthermore, in order to make the unbalance correction positions Θ, Θ±iθ opposite the welding end portion 13a, when the unbalance amount W is less than the set value Ws, the unbalance measuring device 11
When the unbalance amount W is larger than the set value Ws based on the measurement result from the calculation circuit 21, the position adjustment control means outputs a position adjustment control signal to the automatic stop device 18 based on the calculation result from the calculation circuit 21. An index section 22 is provided, and when the unbalance amount W is less than the set value Ws, it is based on the measurement result from the unbalance measuring device 11, and when the unbalance amount W is larger than the set value Ws, it is based on the measurement result from the arithmetic circuit 21. A welding control circuit 23 is provided that outputs a core wire feeding control signal and a welding control signal to the core wire feeding mechanism 15 and the welding machine 13, respectively, based on the calculation results.

Note that the arithmetic circuit 21 can also store and output the comparison result from the comparator 20 and information on the unbalance amount W measured by the unbalance measuring device 11.

Furthermore, the index section 22 stores unbalance correction positions (angles) at a plurality of locations, outputs this unbalance correction position information to the automatic stop device 18, and when a welding completion signal is input to the index section 22, the next If unbalance correction position information exists, it is output to the automatic stop device 18.

In order to correct the unbalance of the workpiece 12 with the above-described configuration, first, in FIG. 1, the unbalance position (angle) Θ measured by the unbalance measuring device 11 is displayed on the angle meter 8,
Position control is performed by the index section 22 so that the displayed position coincides with a fixed position (the position of the arc welding machine 13, which is a correction device). When this position is determined, the workpiece 12 is stopped at this position by the automatic stop device 18, and the weight corresponding to the amount of unbalance is welded by the arc welding machine 13.

By the way, when welding with the welding machine 13, if the amount of unbalance is large, the welding core wire 14 corresponding to the weight will be melted, but in this case, if the welding is done in one place, the height of the welding will be high. Therefore, it is necessary to control the welding machine 13 so that it is always at a constant distance from the welding point. Furthermore, since the height of the build-up is high, problems such as contact with other parts occur after assembly. In an attempt to prevent this, we experimented by welding to a certain length centered at the unbalanced position, but according to this method,
The height is constant and it is only necessary to horizontally move the rotating body or welding machine according to the welding speed. However, as shown in Fig. 4, the shapes of the welding start point and end point of the weld build-up part 24 are not exactly symmetrical, so precise unbalance correction cannot be performed, and this causes errors. may occur.

By the way, the present inventor found that when welding is performed at one location with a weight less than the required amount, the weld build-up portion 24 becomes hemispherical as shown in FIG. It has been found that it is better to limit the maximum weight that can be welded to a location, and when the maximum weight is exceeded, to weld so that the weight is symmetrical at multiple locations that are symmetrical about the unbalanced position Θ.

Next, explanation will be given using a specific example. For example, assume that the unbalance measuring device 11 measures an unbalanced weight of 3 grams, and the set value is set to 2 grams. In this case, if this unbalanced weight is welded at one location, the above-mentioned problem will occur, so it is welded at multiple locations. That is, comparator 20
Since the maximum welding weight (set value) for one location is set at 2 grams, it is determined that the unbalanced weight of 3 grams is distributed over two locations. Thereafter, the position signal is sent to the index section 22. At the same time, the unbalance correction weight Wi at each distributed position is calculated and stored in the calculation circuit 21, and a control signal is sent to the core wire feeding mechanism 15 and the welding machine 13 via the welding control circuit 23. .

In this case, the dispersion position Θ±θ and the corrected weights W ₁ and W ₂ are determined as follows (see FIG. 3).

W ₁ = W ₂ = W/2×1/cosθ≦Ws And since W=3 grams now, W ₁ =W ₂ =3/2×1/cosθ≦2.

Here, W is the amount of unbalance at the unbalance position Θ, and W ₁ and W ₂ are the distributed positions Θ±θ
is the unbalance amount (unbalance correction weight) in .

Also, if the maximum correction weight of W ₁ and W ₂ is determined to be 2 grams, the size of the 2-gram welded circle can be determined empirically, so the distance at which the two W ₁ and W ₂ are not connected must be determined in advance. You can keep it. Therefore, if the distance R from the center of the workpiece 12 to the correction position is determined, the angle θ will also be automatically determined.

Furthermore, as another example, the unbalance measuring device 1
Considering the case where the unbalance amount W measured in step 1 is 5 grams, in this case, the comparator 20 determines the three correction positions, and the calculation circuit 21 performs the following calculation. In other words, a calculation is made to apply 2 grams of welding to the unbalanced position Θ and weld the remaining 3 grams in the same manner as the above-mentioned correction to the two locations Θ±θ. The angle θ in this case will be larger than the case with 2 locations, but if you decide θ for 3 locations and set the same angle θ for 2 locations, then in the case of an even number of locations, The value of the angle θ does not change depending on the case of an odd number of locations, and the calculation can be simplified. In addition, the distance R to the correction position is determined when the welding machine 13 is moved to the workpiece 12 when the size of the workpiece 12 changes and the correction position changes.
2, the distance R is automatically measured.

Once the angle θ is determined in this manner, this angle is also input to the index unit 22, and a position adjustment control signal is input to the automatic stop device 18 so as to sequentially stop at that angle.

On the other hand, the unbalance correction weights W, W ₁ , and W ₂ at the distributed correction positions Θ and Θ±θ are input to the welding control circuit 23 . When the welding core wire 14 is attached to the core wire feeding mechanism 15, the wire diameter is measured at the guide rollers 15a and 15b that feed the core wire 14 and inputted to the welding control circuit 23, and this data is stored in the storage section 25. It is becoming more and more common.
Furthermore, a speed vi suitable for welding according to the wire diameter is selected from the data stored in the data storage section 25 (if no suitable value is available, it is interpolated from the selected value). In addition, the specific gravity of the core wire is stored in the data storage section 25.

From these values, the feeding time of the core wire 14 required to weld the corrected weight Wi, that is, the welding time ti, is determined. Information on the time ti and speed vi is output from the welding control circuit 23 to the welding machine 13 and the core wire feed mechanism 15, which causes the core wire feed mechanism 15 to weld the weld core wire 1 at the required feed speed vi.
4, and the welding machine 13 performs ti welding for this time. As a result, the originally measured imbalance is completely corrected.

Note that the welding control circuit 23 has an automatic stop device 18.
The core feed and welding are automatically controlled in response to a stop signal from the machine, and when welding at one location is completed, the automatic stop is canceled. Then, the index section 22 receives the welding completion signal outputted at this time and outputs a control signal for controlling the position to the next position to the automatic stop device 18.

In this way, the welding machine 1 is placed at the correction position of the work 12.
3, attach the welding core wire 14, and determine the maximum unbalance correction weight for one location.If the correction weight exceeds the maximum unbalance correction weight, the correction weight can be automatically distributed to multiple locations for welding. Balance can be achieved by accurately welding the corrected weight.

In addition, if the unbalance amount is 2 grams or less,
Welding corresponding to the unbalance amount W (=2 grams) is performed at the position Θ measured by the unbalance measuring device 11. In this case, the workpiece 12 is stopped at the required unbalance correction position Θ of the automatic stop device 18 in response to the position adjustment control signal from the index section 22, and then the welding control circuit 23
A core wire feeding control signal and a welding control signal are sent to the core wire feeding mechanism 15 and the welding machine 13, respectively. As a result, welding is performed for a required welding time t at a feed rate v commensurate with the amount of unbalance W. This corrects the imbalance.

In this way, the unbalance correction work by welding can be performed with high accuracy and reliability regardless of the magnitude of the unbalance amount.

Note that if the distance to the correction position of the workpiece 12 is constant, unmanned operation can be achieved by simply replenishing the core wire 14.

6 to 9 show an unbalance correcting device for a rotating body as another embodiment of the present invention. FIG. 6 is a block diagram showing its schematic structure, and FIGS. This is a flowchart for explanation, and in FIG. 6, the same reference numerals as in FIGS. 1, 2, and 10 indicate almost the same parts.

In this embodiment, a computer is used to measure the unbalance vector, calculate the unbalance correction amount, the unbalance correction position, and even control the welding robot. Signals X, Y, X ₀ and Y ₀ from the signal generators 3 and 4 are input to the CPU 27 via an input interface 26 and a bus line.

Furthermore, data is exchanged with the CPU 27 from memories 28 and 29 such as RAM and ROM, or from external memories such as floppy disks as necessary.
A motor (work rotation motor) 19 for rotating the work 12 from 27 through output interfaces 30 to 32, a motor (feed motor) 33 for feeding the core wire, and a motor for driving the welding end 13a of the welding machine 13 up and down. A position adjustment control signal, a core wire feeding control signal, and a welding control signal are sent to the (welding machine drive motor) 34, respectively.

Note that the CPU 27 outputs a trigger signal for causing the welding machine 13 to start welding at a required timing, and a welding completion signal is returned to the CPU 27.

By the way, the CPU 27 is an unbalance measuring means for measuring unbalance vector information of the workpiece 12.
UM, the unbalance amount W measured by this unbalance measuring means UM, and the preset setting value
Comparison method CM to compare Ws and this comparison method
When the unbalance amount W is determined by CM to be larger than the set value Ws, multiple unbalance correction positions are set and the unbalance amount Wi to be corrected is calculated for each unbalance correction position Θ±iθ. and an unbalance measuring means UM when the unbalance amount W is less than the set value Ws in order to make the unbalance correction position face the welding end 13a.
A position adjustment control means CM outputs a position adjustment control signal to the work rotation motor 19 based on the calculation result from the calculation means OM when the unbalance amount W is larger than the set value Ws based on the measurement result from the calculation means OM.
1, when the unbalance amount W is less than the set value Ws, it is based on the measurement result from the unbalance measuring means UM, and when the unbalance amount W is larger than the set value Ws, it is based on the calculation result from the calculation means OM. It has the functions of a welding control means CM2 that outputs a core wire feed control signal and a welding control signal to the feed motor 33 and welding machine drive motor 34, respectively.

The operation of this embodiment will be explained below. First, the main processing routine is shown in FIG. That is, the outline of this processing main routine is as follows. First, the unbalance vector is measured (step A), then the unbalance correction amount and the unbalance correction position are determined in a subroutine (step B), and finally the welding robot including the welding machine 13 and core wire feeding mechanism 15 A control subroutine is executed (step C).

Here, the process at step A is the process of receiving the signals from the pickups 1 and 2 and the synchronizing signal generators 3 and 4 to obtain the unbalance amount W and the unbalance position Θ, as in the conventional case. Detailed explanation will be omitted.

Further, the processing at step B is performed as shown in FIG. That is, first, in step B1, the unbalance amount W and the unbalance position Θ are read, and then in step B2, it is determined whether the unbalance amount W is less than the set value Ws. If W≦Ws, in step B5, Θ and W are stored and the process returns to the main routine; however, if W>Ws, in step B3, the distributed position Θ with Θ as the center is stored.
The correction weight Wi for ±iθ is calculated, and the calculation results Θ±iθ, Wi are stored in step B4, and then the process returns to the main routine.

Furthermore, the processing at step C is performed as shown in FIG. In other words, first at step C1,
Welding core wire information such as W, Θ, Θ±iθ, Wi, core wire diameter, multiple preset feed speeds, core wire specific gravity, etc. is read, and in step C2, it is determined whether distributed welding is necessary. Ru.

If unnecessary, the welding time t and welding speed v are calculated from the unbalance amount W in step C3 via the NO route. Note that the welding speed v is determined from the above-mentioned set feed rate. Thereafter, these data t and v are stored (step C4), and the welding robot is further driven using these data t and v (step C5).

Also, if step C2 is YES, step
In step C6, i=0 is initialized, and then in step C7, individual welding times ti and welding speeds vi are calculated from the unbalance correction position Θ±iθ and the unbalance correction amount Wi. In this case as well, the welding speed vi is determined from the above-mentioned set feed rate. Thereafter, this data ti and vi are stored (step C8), and the welding robot is driven using these data ti and vi (step C9).

As a result, the correction when i=0 was performed, but after that, in step C10, i=i+1
Then, in step C11, it is determined whether i≦N (N is a value determined by the unbalance amount W), and if YES, the processing in steps C7 to C10 is performed again. Then, when i>N, the process returns to the main routine.

In this way, in the case of this embodiment as well, it is possible to automate the unbalance correction work by welding regardless of the magnitude of the unbalance amount, and moreover, the above-mentioned unbalance correction work can be automated. This can be done with high precision and reliability.

In each of the above embodiments, the correction positions were distributed at an angle θ in the circumferential direction around the unbalance measurement position Θ, but depending on the shape of the rotating body, the unbalance amount W may be On the power line (radial direction)
It is also possible to disperse them into two or a combination of these. Furthermore, by switching the maximum correction weight Ws to one location, it is possible to easily and accurately correct unbalance between different types of rotating bodies.

The above description has been made of the case where the rotating body has a single unbalance correction surface, but the present invention can also be applied to a case where there are two correction surfaces. in this case,
One unbalance measuring device is sufficient, but an unbalance measuring section, quantity meter, angle meter, or welding means is required for each surface to be corrected. The rest of the configuration may be as described above, and the measurement result from the unbalance measuring device displays the unbalance position (angle) and amount for each correction surface, and the comparator 20 switches between one correction surface and the other correction surface. They are then compared and further calculated for each corrected surface in an arithmetic circuit, stored and controlled.

In addition, since the position of the index section is similarly controlled for each correction surface, it is possible to control the position and the correction by welding for each correction surface, and as a result, even when there are two correction surfaces, there is no imbalance. Corrections can be automated.

Note that as a means for adjusting the relative positional relationship between the unbalance correction position of the workpiece 12 and the welding end 13a of the welding machine 13, in addition to rotating the workpiece 12, there is also a method of rotating the welding machine 13 around the workpiece 12. , or a combination of these.

〔Effect of the invention〕

As described above in detail, the unbalance correction device for a rotating body of the present invention includes an unbalance measuring means for measuring unbalance vector information of the rotating body, and an unbalance correction device located at the unbalance correction position of the rotating body. and a position adjustment means for adjusting the relative positional relationship between the unbalance correction position of the rotating body and the welding end of the welding means,
a comparison means for comparing the unbalance amount measured by the unbalance measurement means with a preset setting value; and a comparison means that determines that the unbalance amount is larger than the aforementioned setting value. and a calculation means for setting a plurality of unbalance correction positions and calculating the amount of unbalance to be corrected for each unbalance correction position, and a core wire for supplying the weld core wire to the welding end of the welding means. A feeding means is provided so that the unbalance correction position of the rotating body is opposed to the welding end, and when the unbalance amount is less than the set value, the unbalance correction position is adjusted based on the measurement result from the unbalance measuring means. Position adjustment control means is provided for outputting a position adjustment control signal to the position adjustment means based on the calculation result from the calculation means when the amount of unbalance is larger than the set value, and the amount of unbalance is When the unbalance amount is less than the above set value, the control signal for core wire feeding and the welding With a simple configuration that includes a welding control means that outputs control signals to the core wire feeding means and welding means, respectively, it is possible to automate the unbalance correction work by welding, regardless of the amount of unbalance. Moreover, there is an advantage that such unbalance correction work can be performed with high accuracy and reliability.

[Brief explanation of the drawing]

Figures 1 to 5 show an unbalance correcting device for a rotating body as an embodiment of the present invention. Figure 1 is a block diagram showing its schematic configuration, and Figure 2 shows the arrangement of the welding robot. FIG. 3 is a schematic diagram for explaining the distributed unbalance correction positions, FIGS. 4 and 5 are schematic diagrams showing the welding shape, and FIGS. This shows an unbalance correcting device for a rotating body as another embodiment, FIG. 6 is a block diagram showing its schematic configuration, and FIGS. 7 to 9 are flowcharts for explaining its operation. FIG. 10 is a block diagram showing an example of a conventional unbalance correction device for a rotating body. 1, 2...Pickup, 3, 4...Synchronizing signal generator, 5...Unbalance measurement section, 6...Vector synthesis amplifier, 7...Quantity meter, 8...Angle meter, 11...Unbalance measurement Apparatus, 12... Rotating body (work), 13... Arc welding machine, 13a...
... Welding end portion, 14 ... Welding core wire, 15 ... Core wire feeding mechanism, 15a, 15b ... Roller, 16 ... Base member, 17 ... Feed guide section, 18 ... Automatic stop device as position adjustment means, 19... Work rotation motor, 20... Comparator, 21... Arithmetic circuit,
22... Index section (position adjustment control means),
23... Welding control circuit, 24... Weld overlay part,
25...Data storage unit, 26...Input interface, 27...CPU, 28, 29...Memory, 30-32...Output interface, 33
...Feed motor, 34...Welding machine drive motor,
CM: comparison means, CM1: position adjustment control means, CM2: welding control means, OM: calculation means, UM: unbalance measurement means.

Claims (1)

[Claims] 1. An unbalance measuring means for measuring unbalance vector information of the rotating body, a welding means capable of welding for unbalance correction at the unbalance correction position of the rotating body, and an unbalance correction position of the rotating body and the above-mentioned welding. a comparison means for comparing the amount of unbalance measured by the unbalance measuring means with a preset value; Calculating means for setting a plurality of unbalance correction positions when the comparison means determines that the unbalance amount is larger than the set value, and calculating the unbalance amount to be corrected for each unbalance correction position. and core wire feeding means for supplying the welding core wire to the welding end of the welding means, so that the unbalance amount is adjusted so that the unbalance correction position of the rotary body is opposed to the welding end. When the amount of unbalance is less than the set value, the position adjustment control signal is sent to the above position based on the measurement result from the unbalance measuring means, and when the amount of unbalance is greater than the set value, the position adjustment control signal is sent to the above position based on the calculation result from the calculation means. A position adjustment control means for outputting to the adjustment means is provided, and when the unbalance amount is less than the set value, the unbalance amount is larger than the set value based on the measurement result from the unbalance measuring means. and a welding control means for outputting a core wire feeding control signal and a welding control signal to the core wire feeding means and welding means, respectively, based on the calculation result from the calculation means,
Unbalance correction device for rotating bodies.