JP6985972B2 - 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, 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 that moves the weld wire in either the feeder or the second wire feeder and a slowdown feed process that is performed from the end of the weld process to the start of the next weld process. Before the tip comes into contact with the base metal, the buffer amount adjustment process for driving the motor is performed 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. It is provided with a buffer amount adjusting unit to be executed.

According to this aspect, even if the buffer amount acquired by the buffer amount acquisition unit deviates from the original buffer amount set in the reference value when the welding process is completed, the next welding is performed. It is possible to adjust to the original buffer amount before the arc is generated in the process.

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.

In the above aspect, the buffer amount adjusting unit may execute the buffer amount adjusting process from the end of the anti-stick processing to the start of the slowdown feeding process. As a result, from the end of the anti-stick process included in the arc end process executed after the welding process to the start of the slowdown feeding process included in the arc start process executed before the next welding process. It is possible to adjust the buffer amount acquired by the buffer amount acquisition unit to the original buffer amount.

In the above aspect, the buffer amount adjusting unit may execute the buffer amount adjusting process during the slowdown feeding process. This makes it possible to adjust the buffer amount acquired by the buffer amount acquisition unit to the original buffer amount while executing the slowdown feeding process included in the arc start process before the welding process. .. Further, it is possible to eliminate the fluctuation of the buffer amount that occurs after the welding process is completed and before the slowdown feeding process that is executed before the next welding process is started.

In the above aspect, the buffer amount adjusting unit may execute the buffer amount adjusting process during the anti-stick processing. This makes it possible to adjust the buffer amount acquired by the buffer amount acquisition unit to the original buffer amount while the anti-stick process included in the arc end process after the welding process is being executed. Further, since the buffer amount can be adjusted immediately after the steady welding is completed, it is effective when the interval between welding processes is short.

In the above embodiment, the buffer amount adjusting unit may execute the buffer amount adjusting process a plurality of times from the end of the welding process to the contact of the tip of the welding wire with the base metal in the slowdown feeding process. good. As a result, even if the buffer amount acquired by the buffer amount acquisition unit is adjusted to the original buffer amount and then the buffer amount fluctuates due to, for example, a change in the posture of the robot or a bending habit of the wire, in the next welding process. By the time an arc is generated, it is possible to readjust to the original buffer amount.

In the above embodiment, a movement command transmitting unit for transmitting a movement command for moving the welding torch to the next welding start position is further provided, and the movement command transmitting unit moves until the buffer amount adjusting process by the buffer amount adjusting unit is completed. It may be possible to wait for the transmission of the command. As a result, even if the buffer amount acquired by the buffer amount acquisition unit deviates from the original buffer amount when the welding process is completed, the welding torch can be moved to the next welding start position. It is possible to adjust to the original buffer amount.

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 timing chart exemplifying various timings from the end to the start of arc welding. It is a block diagram which illustrates the schematic structure of the wire feeding device in the modification.

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 and the calibration unit 152 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 during any of the periods (1) to (3) described later. 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 a value stored in the memory by the calibration unit 152, and the details of the reference value will be described later.

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 is "5,000" 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 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 period for executing the buffer amount adjustment process can be arbitrarily set to at least one or more of the following periods (1) to (3). The buffer amount adjustment process may be executed a plurality of times in one period. Here, the first welding process and the second welding process are welding processes in which the execution order is continuous, and the second welding process is a welding process executed immediately after the first welding process.

(1) Period during which the anti-stick process executed after the completion of the first welding process is executed.

(2) The period from the end of the anti-stick process to the start of the slowdown feed process executed before the start of the second welding process.

(3) The period from the start of the slowdown feeding process to the contact of the tip of the welding wire with the base metal in the slowdown feeding process.

Here, the anti-stick process is a process included in the arc end process executed after the welding process is completed, and specifically, from the welding voltage at the time of steady welding for a predetermined time after the welding stop command. Is also a process of supplying a low anti-stick voltage and melting the tip of the weld wire. This 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 melting. It includes a process of moving the weld wire forward and backward to shorten the protrusion length of the weld wire.

The slow-down feed process is a process included in the arc start process executed before 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.

When the above (1) is set as the period for executing the buffer amount adjustment process, the buffer amount acquired by the buffer amount acquisition unit 14 during the execution of the anti-stick process included in the arc end process. Can be adjusted to the original buffer amount set as the reference value. As a result, the buffer amount can be adjusted immediately after the steady welding is completed, which is particularly effective when the welding process interval is short.

Here, when the buffer amount adjustment process is executed while the anti-stick process is being executed, the process of advancing and reversing the weld wire by the anti-stick process to shorten the protrusion length of the weld wire and the buffer amount. It is possible that the adjustment process and the adjustment process proceed at the same time. 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.

When the above (2) is set as the period for executing the buffer amount adjustment process, after the anti-stick process included in the arc end process after the welding process is completed, the arc start process before the next welding process is performed. Before the included slowdown feed processing starts, the buffer amount acquired by the buffer amount acquisition unit 14 can be adjusted to the original buffer amount set as the reference value.

When the above (3) is set as the period for executing the buffer amount adjustment process, the buffer amount acquisition unit 14 is executing the slowdown feed process included in the arc start process before the welding process. The buffer amount acquired by the above can be adjusted to the original buffer amount set as the reference value. As a result, it is possible to eliminate the fluctuation of the buffer amount that occurs after the welding process is completed and before the slowdown feeding process that is executed before the next welding process is started.

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, with reference to FIG. 3, a sequence process for shifting from the first welding process to the second welding process will be described.

3A shows the time change of the welding signal St, FIG. 3B shows the time change of the feed rate Fr of the welding wire, and FIG. 3C shows the time change of the welding voltage Vw. The time change is shown, and FIG. 3 (D) of FIG. 3 shows the time change of the welding current Iw.

The period from time t1 to time t2 is the execution period of the arc end process executed after the first welding process, and the period from time t3 to time t4 is the arc start executed before the second welding process. It is the execution period of the process.

Until time t1, steady welding performed in the first welding process is performed.

At time t1, when the welding signal St shown in FIG. 3A is switched to the Low level (OFF) according to the welding end command, the motor of the wire feeding unit is controlled to stop, and FIG. 3B is shown. As shown in, the wire feeding speed Fr gradually decreases due to the inertia of the motor.

At the same time, as shown in FIG. 3 (C), an anti-stick voltage V1 lower than the welding voltage V2 during steady welding is applied, and as shown in FIG. 3 (D), from the welding current I2 during steady welding. A low anti-stick current I1 flows and the anti-stick process is executed. The time from the time t1 to the time t2 is set as the anti-stick time ta, and the anti-stick process is executed during that time.

When the anti-stick process is completed at time t2, the welding torch 3 is moved to the welding start position of the second welding process by the time t3 when the slowdown process executed before the second welding process is started.

At time t3, when the welding signal St shown in FIG. 3 (A) is switched to the high level (ON) according to the welding start command, as shown in FIG. 3 (B), from the feed rate F2 during steady welding. The slowdown feeding process of feeding the weld wire at the slow slowdown feeding speed F1 is executed. The time from the time t3 to the time t4 is set as the slowdown time ts, and the slowdown feeding process is executed during that time.

At the same time, as shown in FIG. 3C, the welding voltage Vw becomes the no-load voltage V3. When the welding wire comes into contact with the base metal at time t4, the welding current I2 during steady welding flows as shown in FIG. 3D, an arc is generated, and as shown in FIG. 3B. The welding wire is fed at the feeding speed F2 at the time of steady welding, and steady welding in the second welding process is performed.

Here, among the periods (1) to (3) listed as the period for executing the buffer amount adjustment process, the period (1) corresponds to the period from time t1 to time t2 in FIG. Similarly, the period (2) above corresponds to the period from time t2 to time t3 in FIG. 3, and the period (3) above corresponds to the period from time t3 to time t4 in FIG. That is, the period (1) to (3) above is the same period as the period from time t1 to time t4 in FIG.

Therefore, it can be paraphrased as follows that the buffer amount adjusting unit 151 executes the buffer amount adjusting process during at least one or more of the above periods (1) to (3). .. The buffer amount adjusting unit 151 executes the buffer amount adjusting process at least once during the period from the time t1 to the time t4 in FIG.

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. The buffer amount acquired by the buffer amount acquisition unit 14 from the end of the welding process to the contact of the tip of the welding wire with the base metal in the slowdown feeding process executed before the start of the next welding process. However, the motor can be driven to adjust the buffer amount so as to reach the reference value of the buffer amount set by the calibration unit 152.

As a result, even if the buffer amount acquired by the buffer amount acquisition unit 14 deviates from the original buffer amount set in the reference value when the welding process is completed, at least the next welding process is performed. By the time the arc is generated, the buffer amount can be adjusted to the original amount.

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.

[Modification example]
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, the wire feeding device 1 in the above-described embodiment moves the welding torch 3 to the next welding start position after the anti-stick processing is completed. On the other hand, the wire feeding device in this modification waits for the movement of the welding torch 3 until the buffer amount adjustment process is completed.

FIG. 4 illustrates the schematic configuration of the wire feeding device in this modification. As shown in FIG. 4, the wire feeding device 1s in this modification is different from the wire feeding device 1 in the embodiment shown in FIG. 1 in that the control unit 15 is further provided with the movement command transmitting unit 153.

After the anti-stick processing is completed and the buffer amount adjusting processing by the buffer amount adjusting unit 151 is completed, the movement command transmitting unit 153 transmits a moving command for moving the welding torch 3 to the next welding start position. That is, the move command transmission unit 153 waits for the transmission of the move command until the buffer amount adjustment process by the buffer amount adjustment unit 151 is completed.

As a result, even if the buffer amount acquired by the buffer amount acquisition unit 14 deviates from the original buffer amount set in the reference value when the welding process is completed, the welding torch can be used as the next welding torch. Since the original buffer amount can be adjusted before moving to the welding start position, it is possible to maintain the quality of the welding process without deteriorating it.

1,1s ... Wire feeding device, 2 ... Wire reel, 3 ... Welding torch, 4 ... Welding wire, 11 ... Second wire feeding section, 12 ... Wire buffer, 13 ... First wire feeding section, 14 ... Buffer amount 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 … Movement command transmission unit.

Claims (8)

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.
The buffer acquired by the buffer amount acquisition unit between the end of the welding process and the contact of the tip of the welding wire with the base metal in the slowdown feeding process executed before the start of the next welding process. A buffer amount adjusting unit that executes a buffer amount adjusting process for driving the motor so that the amount becomes a reference value of the buffer amount stored in the storage device.
A calibration unit that executes calibration of the buffer amount acquisition unit, and a calibration unit.
Equipped with
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 buffer is set. The average value of the minimum value of the amount and the maximum value of the buffer amount is set as the reference value of the buffer amount, and the minimum value of the buffer amount, the maximum value of the buffer amount and the reference value of the buffer amount are set in the storage device. The setting part to be memorized and
including,
Wire 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.
The buffer acquired by the buffer amount acquisition unit between the end of the welding process and the contact of the tip of the welding wire with the base metal in the slowdown feeding process executed before the start of the next welding process. A buffer amount adjusting unit that executes a buffer amount adjusting process for driving the motor so that the amount becomes a reference value of the buffer amount stored in the storage device.
A move command transmitter that sends a move command to move the welding torch to the next welding start position,
Equipped with
The movement command transmission unit waits for transmission of the movement command until the buffer amount adjustment process by the buffer amount adjustment unit is completed.
Wire feeder. 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 claim 1 or 2. 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 3. The buffer amount adjustment unit, from the end of the Anti stick treatment, until the start of the slow-down feed process, executes the buffer amount adjustment process,
The wire feeding device according to any one of claims 1 , 3 and 4. The buffer amount adjusting unit executes the buffer amount adjusting process during the slowdown feeding process.
The wire feeding device according to any one of claims 1 , 3 and 4. The buffer amount adjustment unit in the Anti stick treatment, performing the buffer amount adjustment process,
The wire feeding device according to any one of claims 1 , 3 and 4. The buffer amount adjusting unit executes the buffer amount adjusting process a plurality of times from the end of the welding process to the contact of the tip of the welding wire with the base metal in the slowdown feeding process.
The wire feeding device according to any one of claims 1 , 3 and 4.

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