KR100899759B1 - Apparatus for providing filler wire of welding device - Google Patents

Abstract

The present invention relates to a filler wire supply apparatus of a welder for supplying a filler wire melted by an arc generated between a non-consumable electrode and a base material to the arc generating point, wherein the filler wire is supplied to the arc generating point or the arc A drive unit for feeding back from the generation point; And a driving control unit for controlling the driving unit such that the filler wire is supplied back from the arc generation point when the current supply stop signal to the non-consumable electrode is input.

Welding, non-consumable electrode, welding end signal, filler wire, reverse feeding, welding quality

Description

Filler wire feeding device of welding machine {APPARATUS FOR PROVIDING FILLER WIRE OF WELDING DEVICE}

The present invention relates to a welder, and more particularly, to a filler wire supply apparatus for a welder using non-consumable electrodes.

The arc welding method using electrical energy can be broadly classified into arc welding using a consumable electrode and arc welding using a non-consumable electrode, depending on whether the electrode is consumed by the welding operation.

Among the arc welding methods using consumable electrodes, an inert gas metal welding called MIG (Metal Inert-Gas) welding is typical. Since this method is relatively simple compared to other welding methods, the welding quality is not greatly dependent on the skill of the operator and can be used to weld various ferrous and nonferrous metals, and thus it is used in various metal processing processes. However, this method has disadvantages in that it is not suitable for processes requiring high precision because the electrode to which the current is supplied is melted by the arc.

For this reason, arc welding methods using non-consumable electrodes are mainly used in machining processes requiring precision. Among the arc welding methods using non-consumable electrodes, tungsten arc welding called TIG (Tungsten Inert-Gas) welding is typical. In this manner, a separate tungsten electrode that does not melt generates an arc between the base metal, and a separate filler wire fills the molten portion of the base material melted by the arc. Since the arc is generated by a separate tungsten electrode as described above, the filler wire is inclined at a predetermined angle with respect to the base material. This method can be supplied with a constant current because the tungsten electrode is not consumed, thereby ensuring a high quality clean welding surface.

However, TIG welding, as described above, was difficult to automatically supply filler wire, unlike MIG welding, because the filler wire must be supplied while maintaining a constant angle with the base material. In recent years, research has been actively conducted to automatically supply filler wire in TIG welding, and an automatic filler wire supply device for TIG welding machines, which is the result of such research, is disclosed in Korean Utility Model Registration No. 184366.

According to the disclosed utility model, the filler wire wound on the bobbin is installed to be in contact with the rubber layer formed on the drive shaft of the drive motor, and the filler wire transferred while being in contact with the rubber layer by the drive of the drive motor is guided through the supply pipe. The filler wire is supplied to the welding site through a wire ejector installed to bend at an angle to the torch. However, according to the filler wire automatic feeding device disclosed in the registration utility model, the filler wire can be automatically supplied to the welding site, but the feed rate of the filler wire cannot be adjusted to correspond to the current supplied, so that the welding is completed. Not only can automation be realized, but the efficiency of the welding operation is inferior.

Further, according to the above utility model, the wire supply is stopped at the end of welding and the welding arc is removed 0.2 to 2 seconds after the end of welding. However, even if the welding arc is delayed for a predetermined time from the end of welding, the filler wire may stick to the welding bead surface. This phenomenon is not only cumbersome for the welding work such as post-treatment of the weld bead surface after welding, but also deteriorates the welding quality.

The present invention has been made in view of the above-described point, and an object of the present invention is to provide a filler wire supply device for a welder, which can prevent welding of the filler wire to the weld bead surface at the end of welding to improve welding quality. have.

Another object of the present invention is to provide a filler wire supply device for a welder that can improve the efficiency of welding.

The filler wire supply apparatus of the welding machine according to the present invention for achieving the object as described above is to supply the filler wire melted by the arc generated between the non-consumable electrode and the base material to the arc generating point, A drive unit for supplying to the arc generating point or back feeding from the arc generating point; And a driving controller configured to control the driving unit to supply the filler wire back from the arc generation point when the current supply stop signal to the non-consumable electrode is input.

According to one embodiment of the present invention, the filler wire supply device of the welding machine includes a power switch for inputting the current supply from the power supply of the welding machine to the non-consumable electrode; A retract time setting unit configured to set a time at which the filler wire is reversely supplied; A retract speed setting unit capable of setting a reverse feed rate of the filler wire; A hall sensor installed on an outer circumferential surface of a cable electrically connecting the power supply of the welding machine and the non-consumable electrode to sense a current amount supplied to the non-consumable electrode; A current amount setting unit for setting a current amount supplied to the non-consumable electrode; A wire feed rate control mode setting unit for setting a feed mode control mode of the filler wire to any one of a manual mode and an automatic mode; And a wire feed rate setting unit for manually setting the feed rate of the filler wire.

When the current supply stop signal to the non-consumable electrode is input through the power switch, the driving controller controls the driving unit to be input through the retract speed setting unit for a time input through the retract time setting unit. The filler wire is back fed at the back feed rate.

The driving control unit may control the driving unit such that the filler wire is supplied at a feed rate input through the wire feed rate setting unit when the control mode is set to a manual mode through the wire feed rate control mode setting unit. When the control mode is set to the automatic mode through the wire supply speed control mode setting unit, the driving unit is controlled to supply the filler wire according to the amount of current input from the hall sensor.

The drive unit may include a drive motor connected to the drive control unit to enable signal transmission; A first transfer roller connected to a drive shaft of the drive motor so as to be power-transmitted and disposed on one side of the filler wire in a transfer direction; A first idler roller having an outer circumferential surface in contact with the outer circumferential surface of the first transfer roller with the filler wire interposed therebetween to rotate together with the first transfer roller; A second feed roller connected to a drive shaft of the drive motor so as to be power-transmittable and disposed on the other side of the filler wire in a feed direction; And a second idler roller having an outer circumferential surface in contact with the outer circumferential surface of the second conveying roller with the filler wire interposed therebetween to rotate together with the second conveying roller.

On the other hand, the above object is a filler wire supply method of the welder for supplying the filler wire melted by the arc generated between the non-consumable electrode and the base material to the arc generating point, the step of determining whether the welding end signal is input; ; And when the welding end signal is input, it can also be achieved by the filler wire supply method of the welder comprising the step of feeding back the filler wire from the arc generation point.

In addition, the object as described above is a filler wire supply method of the welder for supplying the filler wire melted by the arc generated between the non-consumable electrode and the base material to the arc generating point, a) the feed rate control mode of the filler wire Inputting; b) if the filler wire feed rate control mode input in step a) is a manual mode, supplying the filler wire at the input feed rate; And c) when the current supply stop signal to the non-consumable electrode is input, the filler wire may be reversely supplied.

In addition, the object as described above is a filler wire supply method of the welder for supplying the filler wire melted by the arc generated between the non-consumable electrode and the base material to the arc generating point, a) the feed rate control mode of the filler wire Inputting; b) controlling the feed rate of the filler wire according to the amount of current supplied to the non-consumable electrode if the filler wire feed rate control mode input in step a) is automatic mode; And c) when the current supply stop signal to the non-consumable electrode is input, the filler wire may be reversely supplied.

According to the problem solving means described above, when the welding end signal, that is, the current supply stop signal is input, the filler wire is fed back to prevent the phenomenon that the filler wire sticks to the weld bead surface, thereby cleaning The bead surface can be formed to improve the welding quality.

In addition, the feed rate of the filler wire can be controlled according to the amount of current supplied to the non-consumable electrode, thereby improving work efficiency. The method of adjusting the current amount according to the filler wire supply speed can also improve the efficiency of the work by adjusting the filler wire supply amount according to the heating value, but there is a disadvantage in that the speed of the welding operation cannot be improved due to the constant supply speed. However, as shown in the present invention, when adjusting the feed rate of the filler wire according to the amount of current supplied to the non-consumable electrode, it is possible to further improve the efficiency of the welding operation because the speed of the welding operation can be improved.

In particular, by controlling the feed rate of the filler wire according to the amount of current actually supplied to the non-consumable electrode by a current amount sensor such as a hall sensor, the amount of current input through the current amount setting unit and the amount of current actually supplied to the non-consumable electrode are different. The feed rate of the filler wire can be controlled according to the heating amount of the welded portion, thereby improving not only the efficiency of the welding operation but also the precision of the welding.

In addition, by allowing the operator to select the automatic mode and the manual mode through the wire feed rate control mode setting unit, the operator can select the most efficient feeder wire feed rate during the same welding operation repeatedly.

In addition, the first feed roller and the first idler roller and the second feed roller and the second idler roller are disposed on both sides of the drive motor to transfer the filler wire, thereby preventing slip between the filler wire, the transfer rollers and the idle rollers. It is possible to transfer the filler wire more stably.

Hereinafter, a filler wire supply device and a supply method of a welder according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 to 5, the filler wire supply apparatus of the welding machine according to an embodiment of the present invention generates the arc of the filler wire 103 which is melted by an arc generated between the non-consumable electrode 107 and the base metal. For supplying to the point, the drive unit 110 for transferring the filler wire 103 wound on the bobbin 102 to the arc generating point, and for detecting the amount of current supplied to the non-consumable electrode 107 A current amount sensor 120, a power switch 130 for selectively supplying current to the non-consumable electrode 107, and an input unit 140 for inputting information to be set for welding by the operator to the welder And a driving controller 150.

3 and 4, the drive unit 110 is disposed inside one side of the case 101, and the torch 300 is wound around the filler wire 103 through the supply pipe 104. The filler wire 103 supplied to the wire discharge unit 106 of the 105 or the wire discharge unit 106 is reversely supplied.

The driving unit 110 may be disposed on one side of the support 111, which is fixed to the case 101, the drive motor 112 installed on the support 111, and one side of the drive motor 112. The first feed roller 113 rotatably installed on the support 111 and the first idler roller 114 rotatably installed on the support 111 to be in contact with the outer circumferential surface of the first feed roller 113. And a second transfer roller 115 rotatably installed on the support 111 to be disposed at the other side of the drive motor 112, and the support 111 to contact an outer circumferential surface of the second transfer roller 115. ) Is a second idler roller 116 rotatably installed.

The first conveying roller 113 is installed at one side of the filler wire 103 in the conveying direction with respect to the driving motor 112, and is gear-coupled with the driving shaft 112a of the driving motor 112 to drive the driving motor. It is rotated by the drive shaft 112a of 112. As shown in FIG.

The first idler roller 114 is installed such that its outer circumferential surface is in contact with the outer circumferential surface of the first feed roller 113, and the filler wire 103 wound around the bobbin 102 is the first feed roller 113. And the portion where the first idler roller 114 is in contact with each other. Therefore, when the first feed roller 113 rotates, the filler wire 103 interposed between the first feed roller 113 and the first idle roller 114 is the first feed roller 113. It is transferred due to friction with).

The first conveying roller 115 and the second idler roller 116 are disposed on the other side in the conveying direction of the filler wire 103 with respect to the driving motor 112. The same structure and the same function as the 113 and the 1st idler roller 114 are performed.

As such, the filler wire 103 may be disposed by disposing the first feed roller 113, the first idle roller, the second feed roller 115, and the second idle roller 116 on both sides of the driving motor 112, respectively. By transferring, the slip that may be generated between the filler wire 103 and the transfer rollers 113 and 115 can be prevented, so that the filler wire 103 can be more stably transferred.

The current amount sensor 120 detects the amount of current supplied to the non-consumable electrode 107, and information about the amount of current set by the current amount setting unit 141 of the input unit 140 is transmitted to the driving controller 150. If it is sent directly, it can be omitted. However, the amount of current supplied from the power supply device 100 to the non-consumable electrode 107 is not always the same as the amount of current set by the current amount setting unit 141. That is, according to the separation distance between the non-consumable electrode 107 and the base material or aging of the power supply device 100, the current amount set through the current amount setting unit 141 is substantially supplied to the non-consumable electrode 107. The amount of current may vary. In this case, the filler wire 103 is detected by detecting the amount of current actually supplied to the non-consumable electrode 107 by the current amount sensor 120 and controlling the supply speed of the filler wire 103 according to the detected amount of current. It is possible to control the feed rate of the more precisely. This can further improve the quality of the welded portion.

In this embodiment, the hall sensor 120 is installed on the outer circumferential surface of the cable 108 disposed inside the case 101, and the hall sensor 120 detects the amount of current flowing through the cable 108. Information about the amount of current measured by the current amount sensor 120 is transmitted to the driving controller 150.

The power switch 130 is a switch for selectively supplying a current to the non-consumable electrode 107, the operator turns on the power switch 130 when starting welding, the power switch 130 when welding is finished OFF. As such, since the power switch 130 is frequently operated by an operator, the power switch 130 is preferably installed in the torch 105 to improve operability. The ON / OFF signal of the power switch 130 is transmitted to the driving controller 150.

The input unit 140 is for the operator to input and set the information required for welding to the welder, the current amount setting unit 141, the wire supply speed control mode setting unit 142, wire supply speed setting unit 143, Lee And a retract time setting unit 144 and a retract speed setting unit 145.

The current amount setting unit 141 is for the user to select a current amount suitable for the type of the base material, etc. by the operator, the power supply device 100 is compared to the current amount input through the current amount setting unit 141. Supply to the consumable electrode 107. In the present exemplary embodiment, the driving controller 150 controls the supply speed of the filler wire 103 according to the amount of current sensed by the hall sensor 120. However, unlike the present exemplary embodiment, the current amount setting unit 141 The supply speed of the filler wire 103 may be controlled in accordance with the amount of current inputted through the.

The wire supply speed control mode setting unit 142 is an automatic mode for controlling the supply speed of the filler wire 103 according to the amount of current supplied to the non-consumable electrode 107, and the operator the wire supply speed setting unit 143 It is to select any one of the manual mode for supplying the filler wire 103 at the feed rate input through the ().

As such, the operator can select the automatic mode and the manual mode through the wire feed rate control mode setting unit 142, so that the operator can select the most efficient feed rate of the filler wire 103 during the same welding operation. This can improve the efficiency of work.

The wire feed rate setting unit 143 is for the operator to input the feed rate of the filler wire 103 when the manual mode is selected through the wire feed rate control mode setting unit 142. The feed rate that may be set through the wire feed rate setting unit 143 is preferably in the range of 0.1 to 9 meters per minute.

The retract time setting unit 144 is for inputting a time for back feeding the filler wire 103 after the welding is finished, and the retract speed setting unit 145 is a reverse supply speed of the filler wire 103. To set it. That is, to set the retract time and the retract speed. The retract time can be set in the range of about 0.1 to 2 seconds and the retract speed can be set in the range of 0.1 to 9 meters per minute.

When the driving control unit 150 is set to the manual mode by the wire supply speed control mode setting unit 142, the drive control unit 150 may supply the filler wire 103 at a supply speed input through the wire supply speed setting unit 143. To control the drive motor 112 to be.

Meanwhile, when the automatic mode is set by the wire supply speed control mode setting unit 142, the driving controller 150 controls the driving motor 112 according to the amount of current input from the hall sensor 120. More specifically, as the amount of current supplied to the non-consumable electrode 107 increases, the amount of heat generated by the arc generated between the base material and the non-consumable electrode 107 increases. Therefore, the driving controller 150 increases the rotational speed of the driving motor 112 and increases the supply speed of the filler wire 103 as the amount of input current increases.

In addition, when the welding end signal is input through the power switch 130, that is, the current supply stop signal to the non-consumable electrode 107 is input, the driving controller 150 rotates the driving motor 112 to reverse the filler. Wire 103 is fed back from the arc generation point. As a result, the filler wire 103 may be prevented from being attached to the weld bead surface, thereby improving welding quality. More specifically, the driving controller 150 supplies the filler wire 103 back at the speed input through the retract speed setting unit 145 for the time input through the retract time setting unit 144. .

Hereinafter, the filler wire supply method of the welding machine which has the structure as mentioned above is demonstrated in detail.

Referring to FIG. 6, first, the driving controller 150 receives a control mode selected by an operator through the wire supply speed control mode setting unit 142 (S10).

Next, the driving controller 150 determines whether the input control mode is a manual mode or an automatic mode (S20). When the input control mode is a modification mode, the driving controller 150 controls the driving motor 112 to supply the filler wire 103 at a feeding speed input through the wire feeding speed setting unit 143. Control (S30). When the input control mode is the automatic mode, the driving controller 150 receives the amount of current from the hall sensor 120 (S40), and controls the supply speed of the filler wire 103 according to the amount of current transmitted. The driving motor 112 is controlled (S50). More specifically, the current amount and the supply speed of the filler wire 103 or the voltage applied to the drive motor 112 may be set in a specific function relationship. Accordingly, the driving controller 150 calculates a supply speed of the filler wire 103 or a voltage applied to the driving motor 112 from the amount of current transmitted from the hall sensor 120 by using the specific function. Based on this, the driving motor 112 is controlled.

In addition, the relationship between the amount of current and the supply speed of the filler wire 103 or the voltage applied to the driving motor 112 may be stored in a memory not shown as a look up table (LUT), 150 may calculate a filler wire 103 supply speed or a voltage applied to the driving motor 112 corresponding to the amount of current input from the lookup table stored in the memory. In this case, the data stored in the lookup table may be calculated by the above-described specific function, but may be calculated to be optimized through trial and error in the actual welding process.

During the welding operation, the driving controller 150 determines whether a welding end signal, that is, a current supply stop signal to the non-consumable electrode 107 is input (S60).

When the operator inputs a welding end signal through the power switch 130, the driving control unit 150 receives the retract time set through the retract time setting unit 144 and the retract speed setting unit 145, respectively. The filler wire 103 is supplied back at a traction speed (S70).

1 is a perspective view schematically showing a welder to which a filler wire supply device of a welder according to an embodiment of the present invention is applied;

2 is a left side view schematically showing a state in which the left side of the filler wire supply device shown in FIG. 1 is opened;

3 is a right side view schematically showing a state in which the right side of the filler wire supply device shown in FIG. 1 is opened;

4 is a front view schematically showing the driving unit shown in FIG.

5 is a control block diagram of the filler wire supply device shown in FIG. 1;

6 is a flowchart illustrating a filler wire supply method according to an embodiment of the present invention.

<Description of main reference numerals in the drawings>

100; Power supply 103; Filler wire

110; Drive unit 112; Drive motor

113; First feed roller 114; 1st Children Roller

115; Second feed roller 116; 2nd children roller

120; Current sensor, hall sensor 130; Power switch

141; Current amount setting unit 142; Wire feed speed control mode setting part

143; Wire feed rate setting unit 144; Retract time setting part

145; Retract speed setting unit 150; Drive control unit

Claims (8)

delete In the filler wire supply apparatus of the welder for supplying the filler wire melted by the arc generated between the non-consumable electrode and the base material to the arc generation point, A drive unit for feeding the filler wire to the arc generating point or back feeding from the arc generating point; A driving control unit controlling the driving unit to supply the filler wire back from the arc generation point when a current supply stop signal to the non-consumable electrode is input; A retract time setting unit configured to set a time at which the filler wire is reversely supplied; And Retract speed setting unit for setting the reverse feed rate of the filler wire, The drive control unit, When the current supply stop signal to the non-consumable electrode is input, the drive unit is controlled to reversely supply the filler wire at the reverse feed rate input through the retract speed setting unit for a time input through the retract time setting unit. Filler wire supply apparatus of the welding machine, characterized in that. The method of claim 2, A hall sensor installed on an outer circumferential surface of a cable electrically connecting the power supply of the welding machine and the non-consumable electrode, and detecting a current amount supplied to the non-consumable electrode, The drive control unit, The filler wire supply apparatus of the welder, characterized in that for controlling the drive unit to adjust the supply speed of the filler wire in accordance with the amount of current sensed from the Hall sensor. The method of claim 3, A current amount setting unit for setting a current amount supplied to the non-consumable electrode; A wire feed rate control mode setting unit for setting a feed mode control mode of the filler wire to any one of a manual mode and an automatic mode; And It includes a wire feed rate setting unit for manually setting the feed rate of the filler wire, The drive control unit, When the control mode is set to the manual mode through the wire feed rate control mode setting unit, the drive unit is controlled to supply the filler wire at a feed rate input through the wire feed rate setting unit, When the control mode is set to the automatic mode through the wire supply speed control mode setting unit, the filler wire supply apparatus of the welding machine, characterized in that for controlling the drive unit so that the filler wire is supplied in accordance with the amount of current input from the hall sensor. . The drive unit according to any one of claims 2 to 4, wherein A drive motor connected to the drive controller to enable signal transmission; A first transfer roller connected to a drive shaft of the drive motor so as to be power-transmitted and disposed on one side of the filler wire in a transfer direction; A first idler roller having an outer circumferential surface in contact with the outer circumferential surface of the first transfer roller with the filler wire interposed therebetween to rotate together with the first transfer roller; A second feed roller connected to a drive shaft of the drive motor so as to be power-transmittable and disposed on the other side of the filler wire in a feed direction; And And a second idler roller having an outer circumferential surface in contact with the outer circumferential surface of the second conveying roller with the filler wire interposed therebetween to rotate together with the second conveying roller. delete delete delete

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