JP6975091B2 - Wire feeder - Google Patents

Description

The present invention relates to a wire feeding device.

The following Patent Document 1 discloses a wire feeding device in which a wire buffer is provided between two wire feeding units. This wire feeding device obtains an acquired value corresponding to the amount of welded wire contained in the wire buffer (hereinafter referred to as "buffer amount") with respect to the welded wire (force for compressing in the length direction) and tension. Calibrate based on. Specifically, the wire feeder moves the weld wire so that the buffer amount increases, and sets the buffer amount when the pressing force on the weld wire exceeds the threshold value to the maximum value, while reducing the buffer amount. The welding wire is moved, and the buffer amount when the tension on the welding wire exceeds the threshold value is set to the minimum value. Then, the median value of the maximum value and the minimum value is set as the reference value (origin position) of the buffer amount.

Japanese Unexamined Patent Publication No. 2015-58469

The wire feeding device described in Patent Document 1 performs a welding process on a base material while advancing and retreating the welding wire at high speed. Therefore, the buffer amount after the welding process may deviate from the original buffer amount set as the reference value. If the next welding process is performed in a state where the reference buffer amount deviates from the original buffer amount, the quality of the welding process deteriorates. Therefore, it is necessary to adjust the buffer amount before starting the next welding process. However, when the welding positions provided for each welding process are continuously provided at short intervals, such as tap welding and tack welding, from the end of the welding process to the start of the next welding process. The time is short, and it is difficult to secure the time to adjust the buffer amount during that time. Therefore, the buffer amount cannot be adjusted, and the quality of the welding process may deteriorate.

Therefore, an object of the present invention is to provide a wire feeding device capable of maintaining the quality of the welding process.

The wire feeding device according to one aspect of the present invention includes a first wire feeding section for feeding the welded wire, a wire buffer for accommodating the welded wire fed by the first wire feeding section, and a wire. A second wire feeding unit that feeds the welding wire contained in the buffer to the welding torch, a buffer amount acquisition unit that acquires the buffer amount of the welding wire contained in the wire buffer, and at least the first wire feeding unit. A motor for moving the welding wire in either the feeding unit or the second wire feeding unit, and a buffer stored in the storage device for the buffer amount acquired by the buffer amount acquisition unit after the welding process is completed. Feeding of welded wire by at least one of the first wire feeding part and the second wire feeding part, and the buffer amount adjusting unit that executes the buffer amount adjusting process for driving the motor so as to reach the reference value of the amount. A wire feeding control unit for controlling feeding is provided, and the wire feeding control unit waits for the start of feeding of the welded wire in the next welding process until the buffer amount adjusting process is completed.

According to this aspect, when the welding process is completed, the buffer amount acquired by the buffer amount acquisition unit deviates from the original buffer amount set in the reference value, and the welding process is performed. Even if the welding positions provided for each are continuously provided at short intervals, it is possible to wait for the start of feeding of the welding wire to be performed in the next welding process until the buffer amount adjustment process is completed. can. Therefore, the original buffer amount can be adjusted by the time the feeding of the welding wire is started in the next welding process.

In the above embodiment, even if the time limit set to be longer than the minimum time required for adjusting the buffer amount has elapsed since the buffer amount adjustment process was started by the buffer amount adjusting unit, the wire feeding control unit When the buffer amount adjusting process is not completed, the feeding of the welding wire in the next welding process may be started. As a result, for example, when the processing efficiency drops if a certain amount of time is required during the welding process, the buffer amount adjustment process is executed after securing the minimum time required for adjusting the buffer amount. It is possible to start the next welding process as soon as possible.

In the above aspect, after the welding process is completed, it may be after the anti-stick process included in the arc end process of the welding process is started. As a result, the buffer amount adjustment process can be started earlier than the case where the buffer amount adjustment process is started after the arc end process is completed. Therefore, for example, when welding is performed with a short interval between welding processes. In addition, it is possible to improve the processing efficiency.

In the above embodiment, a calibration unit for executing calibration of the buffer amount acquisition unit is further provided, and the calibration unit includes a wire movement control unit that drives the motor and moves the welded wire so that the buffer amount is reduced, and the torque of the motor. The buffer amount when the threshold is reached is set to the minimum value of the buffer amount, the value obtained by adding a predetermined value to the minimum value is set to the maximum value of the buffer amount, and the minimum value of the buffer amount and the maximum value of the buffer amount are set. The average value of the values may be set as the reference value of the buffer amount, and the setting unit for storing the minimum value of the buffer amount, the maximum value of the buffer amount, and the reference value of the buffer amount in the storage device may be included. As a result, the maximum value can be calculated by adding a predetermined value to the minimum value having a relatively small variation during calibration, so that the variation in the maximum value of the buffer amount can be suppressed. Further, since the median value of the buffer amount can be set as the target value (reference) when controlling the feeding of the welded wire, the buffer amount reaches the minimum value or the maximum value when the welded wire is fed. The possibility can be reduced and the stability during welding can be improved.

In the above embodiment, an angle detecting unit for detecting an angle at a predetermined position of the welding wire housed in the wire buffer may be further provided, and the buffer amount may be determined by the angle detected by the angle detecting unit. The angle at a predetermined position when the capacity of the welded wire in the wire buffer is the minimum and the maximum can be mechanically determined by the shape in the wire buffer. Therefore, by defining the buffer amount by the angle detected by the angle detection unit, it is possible to easily grasp the minimum value and the maximum value of the buffer amount.

In the above embodiment, the buffer amount adjusting unit calculates and calculates the difference between the buffer amount acquired by the buffer amount acquisition unit and the reference value of the buffer amount stored in the storage device in the buffer amount adjusting process. The motor may be driven so that the difference is eliminated. This makes it possible to adjust the buffer amount acquired by the buffer amount acquisition unit to the original buffer amount by driving the motor so as to eliminate the difference between the value acquired by the buffer amount acquisition unit and the reference value. Become.

According to the present invention, it is possible to provide a wire feeding device capable of maintaining the quality of the welding process.

It is a block diagram which illustrates the schematic structure of the wire feeding device in an embodiment. It is a schematic diagram which illustrates the structure of the wire buffer of FIG. It is a flowchart for demonstrating an example of the operation of the wire feeding apparatus in an embodiment.

Preferred embodiments of the present invention will be described with reference to the accompanying drawings. In each figure, those with the same reference numerals have the same or similar configurations.

FIG. 1 is a block diagram illustrating a schematic configuration of a wire feeding device according to the present invention. The wire feeding device 1 is a device that feeds the welding wire 4 wound around the wire reel 2 to the welding torch 3 that performs arc welding. The wire feeding device 1 is, for example, a first wire feeding unit 11, a wire buffer 12, a second wire feeding unit 13, a buffer amount acquisition unit 14, a buffer amount adjusting unit 151, and a calibration unit 152. The control unit 15 is provided with.

The first wire feeding unit 11 feeds the welding wire 4 wound around the wire reel 2 toward the welding torch 3. The first wire feeding unit 11 has, for example, a roller (not shown) for moving the welding wire 4 forward or backward, and a motor (not shown) for rotating the roller. The forward movement of the welding wire 4 means that the welding wire 4 moves in the direction of the welding torch 3, and the backward movement of the welding wire 4 means that the welding wire 4 moves in the direction of the wire reel 2.

The motor of the first wire feeding unit 11 rotates in the direction of advancing or retracting the welding wire 4 according to the instruction from the control unit 15. Illustratively, when welding, the first wire feeding unit 11 feeds the welding wire 4 in the direction of advancing according to the instruction from the control unit 15. Further, when the buffer amount is calibrated or adjusted, the first wire feeding unit 11 moves the welding wire 4 in the forward direction or the backward direction according to the instruction from the calibration unit 152 or the buffer amount adjustment unit 151.

The second wire feeding unit 13 feeds the welding wire 4 housed in the wire buffer 12 to the welding torch 3. The second wire feeding unit 13 has a roller and a motor in the same manner as the first wire feeding unit 11 described above. Details of the rollers and motor will be omitted.

Illustratively, when welding, the second wire feeding unit 13 is attached to the welding torch 3 while repeatedly moving the welding wire 4 forward and backward with respect to the base metal in accordance with the instruction from the control unit 15. Welding wire 4 is fed. Further, when the buffer amount is calibrated or adjusted, the second wire feeding unit 13 moves the welding wire 4 in the forward direction or the backward direction according to the instruction from the calibration unit 152 or the buffer amount adjustment unit 151.

The wire buffer 12 is provided between the first wire feeding unit 11 and the second wire feeding unit 13. The wire buffer 12 accommodates the welded wire 4 fed by the first wire feeding unit 11, and passes the accommodated welded wire 4 to the second wire feeding unit 13. Depending on the amount of welded wire 4 fed by the first wire feeding unit 11 and the amount of welded wire 4 fed in the forward direction by the second wire feeding unit 13, the wire buffer 12 is supplied. The amount of the weld wire 4 to be accommodated, that is, the amount of the buffer varies.

For example, when the amount of the weld wire 4 fed in the forward direction by the first wire feeding unit 11 is larger than the amount of the weld wire 4 fed in the forward direction by the second wire feeding unit 13. In addition, the amount of buffer increases. Further, when the amount of the welding wire 4 fed in the forward direction by the first wire feeding unit 11 is smaller than the amount of the welding wire 4 fed in the forward direction by the second wire feeding unit 13. In addition, the amount of buffer is reduced.

In other words, the buffer amount varies due to the change in the length of the welding wire 4 accommodated in the wire buffer 12. Therefore, the buffer amount can be determined based on the length of the weld wire 4 housed in the wire buffer 12.

An example of the configuration of the wire buffer 12 will be described with reference to FIG. The wire buffer 12 has, for example, a case 121, a wire guide 122, and a support portion 123.

The case 121 is provided with an inlet 121a and an outlet 121b for passing the welding wire 4 inside. A wire guide 122 for guiding the welding wire 4 is provided between the inlet 121a and the outlet 121b. The wire guide 122 is formed of, for example, a coiled metal wire or resin, and its length expands or contracts according to the amount of the welded wire 4 accommodated in the case 121, that is, the buffer amount.

Specifically, as the buffer amount increases, the length of the wire guide 122 becomes longer, and when the buffer amount becomes maximum, the wire guide 122 becomes the state of 122x in FIG. On the other hand, when the buffer amount is reduced, the length of the wire guide 122 is shortened, and when the buffer amount is minimized, the wire guide 122 is in the state of 122n in FIG.

The support portion 123 rotatably supports at least a part of the wire guide 122 with respect to the case 121. The support portion 123 illustrated in FIG. 2 rotatably supports the substantially center of the wire guide 122 at the substantially center of the case 121 (in the direction of rotation shown in the figure). The support portion 123 is formed of, for example, a disk-shaped member rotatably provided with respect to the case 121, and the wire guide 122 is passed through a hole provided in the radial direction of the support portion 123.

The support portion 123 rotates in the counterclockwise direction shown in the figure as the buffer amount increases. On the other hand, when the buffer amount is reduced, the support portion 123 rotates in the clockwise direction shown in the figure.

An encoder (not shown) is provided inside the support portion 123. The encoder detects the rotation angle of the support portion 123 with respect to the case 121. The rotation angle is not limited to the encoder, and may be any angle detection unit including, for example, a sensor capable of detecting the rotation angle.

The buffer amount acquisition unit 14 shown in FIG. 1 acquires the amount of the welded wire 4 housed in the wire buffer 12, that is, the buffer amount. Specifically, the buffer amount acquisition unit 14 acquires the buffer amount by acquiring the rotation angle detected by the encoder of the support unit 123.

Here, as described above, when the buffer amount increases or decreases, the rotation angle of the support portion 123 increases or decreases. That is, the buffer amount and the rotation angle of the support portion 123 have a monotonic mapping relationship. Therefore, once the rotation angle is known, the rotation angle can be converted into the buffer amount. Thereby, by acquiring the rotation angle, the buffer amount can be acquired based on the rotation angle.

The method of acquiring the buffer amount is not limited to the method using the above-mentioned encoder. For example, the buffer amount acquisition unit 14 uses a roller provided at the inlet 121a and the outlet 121b of the case 121, which rotates according to the movement of the welding wire 4, and an encoder for detecting the rotation speed of the roller. It may be possible to acquire the buffer amount. In this case, the buffer amount acquisition unit 14 can acquire the buffer amount by acquiring the length of the welding wire 4 that has entered the case 121 and the length of the welding wire 4 that has come out of the case 121. Specifically, the buffer amount acquisition unit 14 acquires the buffer amount by subtracting the length of the welding wire 4 coming out of the case 121 from the length of the welding wire 4 entering the case 121.

The control unit 15 shown in FIG. 1 is composed of, for example, a control unit including a processor, a memory (storage device), and a communication interface as a physical configuration. The control unit 15 realizes the functions as the buffer amount adjusting unit 151, the calibration unit 152, and the wire feeding control unit 153 illustrated in FIG. 1 by the processor executing a predetermined program stored in the memory.

The buffer amount adjusting unit 151 executes the buffer amount adjusting process after the welding process is completed. In the buffer amount adjustment process, the first wire feeding unit 11 and the second wire feeding unit 11 and the second wire feeding unit so that the buffer amount acquired by the buffer amount acquisition unit 14 becomes the reference value of the buffer amount stored in the memory. This is a process for driving a motor provided in any of the units 13. Both motors provided in the first wire feeding unit 11 and the second wire feeding unit 13 may be driven. The reference value of the buffer amount is stored in the memory by the calibration unit 152, and the details of the reference value will be described later.

The case after the welding process is completed corresponds to the period after the arc end process executed when the welding process is completed is completed, but the present invention is not limited to this. For example, it may be after starting the anti-stick processing included in the arc end processing. The anti-stick process is a process of supplying an anti-stick voltage lower than the welding voltage at the time of steady welding for a predetermined time after the welding stop command to melt the tip of the welding wire.

The anti-stick treatment includes, for example, melting the tip of the weld wire to shorten the protruding length of the weld wire, rounding the tip shape of the wire by the surface tension of the melted portion, and during melting. Includes a process of moving the weld wire forward and backward to shorten the protrusion length of the weld wire. In this way, the anti-stick process does not perform welding while advancing and retreating the welding wire at high speed unlike the steady welding process, so the buffer amount fluctuates during the anti-stick process. Is considered to be almost nonexistent.

When the buffer amount adjustment process is executed after the anti-stick process is started, the process of advancing and reversing the weld wire in the anti-stick process to shorten the protrusion length of the weld wire and the buffer amount adjustment process proceed at the same time. Things can happen. For example, in the buffer amount adjusting process, the first wire feeding unit 11 advances the weld wire by "3 cm", and in the anti-stick process, the second wire feeding unit 13 retracts the weld wire by "2 cm" at the same time. May be done. In this case, instead of driving the motor of the first wire feeding unit 11 and the motor of the second wire feeding unit 13 separately to execute the sequential processing, both processings are finally completed. It is preferable to drive (including simultaneous drive) the motor of the first wire feeding unit 11 and the motor of the second wire feeding unit 13.

An example of a method of controlling the buffer amount acquired by the buffer amount acquisition unit 14 so as to be a reference value of the buffer amount stored in the memory will be described below. The buffer amount adjusting unit 151 calculates, for example, the difference between the acquired buffer amount and the reference value of the stored buffer amount, and drives the motor so that the calculated difference is eliminated.

Specifically, when the acquired buffer amount (encoder detection value) is "5,000" and the stored buffer amount reference value is "5,500", the difference is "+500". It becomes. In this case, the buffer amount adjusting unit 151 drives the motor so that the buffer amount acquired by the buffer amount acquisition unit 14 increases by "500". Further, when the acquired buffer amount is "6,000" and the reference value of the stored buffer amount is "5,500", the difference is "-500". In this case, the buffer amount adjusting unit 151 drives the motor so that the buffer amount acquired by the buffer amount acquisition unit 14 is reduced by "500".

The wire feeding control unit 153 shown in FIG. 1 outputs a command to at least one of the first wire feeding unit 11 and the second wire feeding unit 13 to control the feeding of the welded wire 4.

The wire feeding control unit 153 starts feeding the welding wire in the next welding process after the welding start command is transmitted and after the buffer amount adjusting process by the buffer amount adjusting unit 151 is completed. That is, the wire feeding control unit 153 waits for the start of feeding of the welded wire until the buffer amount adjusting process by the buffer amount adjusting unit 151 is completed.

The wire feeding control unit 153 starts feeding the welded wire when the buffer amount adjusting process is not completed even after a predetermined time has elapsed since the buffer amount adjusting process was started by the buffer amount adjusting unit 151.

The feed of the welded wire to be started may be a feed by a slow-down feed process or a normal feed process. The slow-down feed process is a process included in the arc start process executed when the welding process is started. Specifically, the feed rate during steady welding is a predetermined time after the welding start command. It is a process of feeding the welded wire at a slower feed rate.

The calibration unit 152 shown in FIG. 1 has a wire movement control unit 152a and a setting unit 152b, and calibrates the buffer amount acquisition unit 14.

The wire movement control unit 152a drives a motor provided in at least one of the first wire feeding unit 11 and the second wire feeding unit 13, and moves the welding wire 4 so that the buffer amount is reduced.

The setting unit 152b sets the buffer amount when the torque of the motor reaches the threshold value to the minimum value of the buffer amount, and sets the value obtained by adding a predetermined value to the minimum value to the maximum value of the buffer amount. The threshold value is preferably set by obtaining in advance the torque of the motor when the minimum value of the buffer amount becomes the optimum value by an experiment or the like. The predetermined value to be added to the minimum value can be arbitrarily set to a value unique to each wire feeding device 1, and for example, the range of the detection value of the encoder corresponding to the mechanically operable range in the wire buffer 12. Is preferably set as a predetermined value.

Thereby, the maximum value can be calculated by adding the range of the detection value of the encoder corresponding to the mechanically operable range peculiar to the wire buffer 12 to the minimum value having relatively little variation at the time of calibration. Here, when the maximum value of the buffer amount is set based on the pushing force on the welding wire as in the wire feeding device described in Patent Document 1 described above, the buffer is pushed depending on the type of the welding wire and the posture of the welding robot. Since the buffer amount with respect to the force changes, the maximum value of the buffer amount tends to vary. Therefore, by adding a predetermined value to the minimum value and setting the maximum value as described above, it is possible to suppress the variation in the maximum value of the buffer amount.

For example, the setting unit 152b sets the average value (median value) of the minimum value and the maximum value of the buffer amount as the reference value of the buffer amount, and sets this reference value together with the minimum value and the maximum value in the memory. Store in the value table. The value set as the reference value of the buffer amount is not limited to the average value of the minimum value and the maximum value of the buffer amount, and for example, the maximum value and the minimum value of the buffer amount are divided by a predetermined ratio. It may be a value to be used.

Next, an example of the operation of the wire feeding device 1 in the embodiment will be described with reference to FIG.

First, the wire feeding control unit 153 starts the welding process (step S101) and feeds the welded wire.

Subsequently, the buffer amount adjusting unit 151 determines whether or not the welding process is completed (step S102). When this determination is NO (step S102; NO), the determination in step S102 is repeated until the welding process is completed.

When it is determined in step S102 that the welding process is completed (step S102; YES), the buffer amount adjusting unit 151 starts the buffer amount adjusting process (step S103).

Subsequently, the wire feed control unit 153 determines whether or not the buffer amount adjustment process is completed (step S104). When this determination is NO (step S104; NO), the wire feed control unit 153 determines whether or not a predetermined time has elapsed since the buffer amount adjustment process was started (step S105). If this determination is NO, the process proceeds to step S104.

When it is determined in step S104 that the buffer amount adjustment process is completed (step S104; YES), or when it is determined that a predetermined time has elapsed since the buffer amount adjustment process was started in step S105 (step S105). (YES), the wire feeding control unit 153 starts feeding the welding wire for the next welding process (step S106). Then, the process shifts to the above step S102.

As described above, according to the wire feeding device 1 in the embodiment, in the wire feeding device 1 in which the wire buffer 12 is provided between the first wire feeding section 11 and the second wire feeding section 13. After the welding process is completed, the buffer amount is adjusted by driving the motor so that the buffer amount acquired by the buffer amount acquisition unit 14 becomes the reference value of the buffer amount set by the calibration unit 152. The adjustment process can be executed, and further, until the buffer amount adjustment process is completed, it is possible to wait for the start of feeding of the welding wire to be performed in the next welding process.

As a result, when the buffer amount acquired by the buffer amount acquisition unit 14 is deviated from the original buffer amount set in the reference value when the welding process is completed, for example, tap welding or Even when the welding positions provided for each welding process are continuously provided at short intervals as in tack welding, the welding wire to be performed in the next welding process until the buffer amount adjustment process is completed. You can wait for the start of feeding. Therefore, the original buffer amount can be adjusted by the time the feeding of the welding wire is started in the next welding process.

Therefore, according to the wire feeding device 1 in the embodiment, it is possible to hold the wire feeding device without deteriorating the quality of the welding process.

Further, according to the wire feeding device 1 in the embodiment, the wire feeding control unit 153 performs the buffer amount adjusting process even if a predetermined time limit elapses after the buffer amount adjusting process is started by the buffer amount adjusting unit 151. If is not completed, the feed of the weld wire in the next welding process can be started. It is desirable to set the predetermined time limit to be longer than the minimum time required for adjusting the buffer amount. The minimum time required to adjust the buffer amount is arbitrarily set within the range in which the minimum welding quality is maintained, for example, in consideration of the relationship between the deviation amount of the buffer amount from the reference value and the quality of the welding process. be able to. As a result, for example, when the processing efficiency drops if a certain amount of time is required during the welding process, the buffer amount adjustment process is executed after securing the minimum time required for adjusting the buffer amount. The next welding process can be started as soon as possible. That is, it is possible to secure the maximum welding quality within a limited time.

The embodiments described above are for facilitating the understanding of the present invention, and are not for limiting the interpretation of the present invention. Each element included in the embodiment and its arrangement, material, condition, shape, size, and the like are not limited to those exemplified, and can be appropriately changed. For example, each of the above-mentioned processing steps can be arbitrarily changed in order or executed in parallel within a range that does not cause a contradiction in the processing contents.

1 ... Wire feeder, 2 ... Wire reel, 3 ... Welding torch, 4 ... Welding wire, 11 ... Second wire feeder, 12 ... Wire buffer, 13 ... First wire feeder, 14 ... Buffer Quantity acquisition unit, 15 ... control unit, 121 ... case, 122 ... wire guide, 123 ... support unit, 151 ... buffer amount adjustment unit, 152 ... calibration unit, 152a ... wire movement control unit, 152b ... setting unit, 153 ... wire Feed control unit.

Claims (5)

The first wire feeding unit that feeds the welded wire,
A wire buffer for accommodating the welded wire fed by the first wire feeding unit, and
A second wire feeding unit that feeds the welding wire contained in the wire buffer to the welding torch,
A buffer amount acquisition unit for acquiring the buffer amount of the welded wire housed in the wire buffer, and a buffer amount acquisition unit.
A motor that moves the welded wire in at least one of the first wire feeding section and the second wire feeding section.
After the welding process is completed, the buffer amount adjusting process for driving the motor is executed so that the buffer amount acquired by the buffer amount acquisition unit becomes the reference value of the buffer amount stored in the storage device. Buffer amount adjustment unit and
A wire feeding control unit that controls the feeding of the welded wire by at least one of the first wire feeding unit and the second wire feeding unit.
Equipped with
The wire feeding control unit waits for the start of feeding of the welding wire in the next welding process until the buffer amount adjusting process is completed.
In the wire feeding control unit, even if a time limit set to be longer than the minimum time required for adjusting the buffer amount has elapsed after the buffer amount adjusting process is started by the buffer amount adjusting unit, the wire feeding control unit may elapse. When the buffer amount adjustment process is not completed, the feeding of the welding wire in the next welding process is started.
Wa hate feeder. The first wire feeding unit that feeds the welded wire,
A wire buffer for accommodating the welded wire fed by the first wire feeding unit, and
A second wire feeding unit that feeds the welding wire contained in the wire buffer to the welding torch,
A buffer amount acquisition unit for acquiring the buffer amount of the welded wire housed in the wire buffer, and a buffer amount acquisition unit.
A motor that moves the welded wire in at least one of the first wire feeding section and the second wire feeding section.
After the welding process is completed, the buffer amount adjusting process for driving the motor is executed so that the buffer amount acquired by the buffer amount acquisition unit becomes the reference value of the buffer amount stored in the storage device. Buffer amount adjustment unit and
A wire feeding control unit that controls the feeding of the welded wire by at least one of the first wire feeding unit and the second wire feeding unit.
Equipped with
The wire feeding control unit waits for the start of feeding of the welding wire in the next welding process until the buffer amount adjusting process is completed.
After the welding process is completed, the term is after the anti-stick process included in the arc end process of the welding process is started.
Wa hate feeder. A calibration unit for executing calibration of the buffer amount acquisition unit is further provided.
The calibration unit is
A wire movement control unit that drives the motor and moves the welding wire so that the buffer amount is reduced.
The buffer amount when the torque of the motor reaches the threshold value is set to the minimum value of the buffer amount, the value obtained by adding a predetermined value to the minimum value is set to the maximum value of the buffer amount, and the minimum value is set. A setting unit that sets the average value of the value and the maximum value as the reference value of the buffer amount, and stores the minimum value of the buffer amount, the maximum value of the buffer amount, and the reference value of the buffer amount in the storage device.
including,
The wire feeding device according to claim 1 or 2. Further, an angle detecting unit for detecting an angle at a predetermined position of the welding wire housed in the wire buffer is provided.
The buffer amount is determined by the angle detected by the angle detection unit.
The wire feeding device according to any one of claims 1 to 3. The buffer amount adjusting unit calculates the difference between the buffer amount acquired by the buffer amount acquisition unit and the reference value of the buffer amount stored in the storage device in the buffer amount adjusting process, and obtains the buffer amount adjusting unit. Drive the motor so that the calculated difference is eliminated.
The wire feeding device according to any one of claims 1 to 4.

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