JP2010131668A - Welding apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To properly grasp a condition of a filler metal and to adequately feed the filler metal. <P>SOLUTION: The welding apparatus includes: a heater 22 that heats a base material and a filler metal wire at a welding position (brazing position); a hollow wire guide 12 that passes the wire to guide it to the welding position; a wire supply member 20 that sends the wire to the welding position or withdraws it from the welding position; a displacement measuring means that measures displacement of a prescribed member caused by reactive force against pumping from bending of the wire sent to the welding position by the wire supply member 20; and a control means that, on the basis of the change in displacement by the displacement measuring means, controls sending and withdrawing of the filler metal wire by the wire supply member 20. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a welding apparatus that appropriately grasps the temperature of a welding position and appropriately supplies a filler wire.

  Various techniques are known for joining two metals. For example, brazing is a method in which a metal having a lower melting point is melted and added between two metals in a solid phase, and one is bonded in a solid phase and the other in a liquid phase. Specifically, when the entire brazed portion between two metals is heated to an appropriate temperature, the brazing material is poured between the two metals. For brazing, it is important to appropriately control the temperature of the metal to be joined. For example, in Patent Document 1, in order to detect the metal temperature, the energized state between the brazing material and the workpiece is examined, and the brazing material is melted to change from the energized state to the non-energized state. In addition, a brazing device that determines that the brazing material has reached a predetermined temperature has been proposed.

JP-A-6-297142 JP 2003-320453 A JP 2004-98151 A

  Patent Document 2 discloses a technique in which a temperature sensor is arranged in a holding jig for a workpiece and a brazing condition is calculated based on the jig temperature. In Patent Document 3, the brazing material is heated and supplied to the member to be brazed to a predetermined temperature, and when the supply is completed, the supply time is measured. A technique for correcting an appropriate heating amount by correcting a temperature curve representing the above is disclosed.

  In the technique of Patent Document 1, it is determined that the brazing material has reached a predetermined temperature when the energized state is changed to the non-energized state. However, in Patent Document 1, only two states, an energized state and a non-energized state, are detected, and other states (a state before the wax melts and a state after the wax melts) are known. There was a problem that it was not possible.

  In the techniques of Patent Document 2 and Patent Document 3, the temperature in the vicinity of the brazing position is directly measured. However, since the temperature at the brazing position cannot be directly measured, a considerable error may occur. In brazing, it is important to find the timing at which the wax melts and to appropriately control the supply and stop of the brazing, and there is a risk that proper brazing cannot be performed due to temperature errors.

  For welding that integrates a plurality of base materials with a molten filler material, as described above, the molten filler material is allowed to flow into the gaps of the plurality of base materials, and outside the brazing to join the base materials, Various things are known. For example, in MIG (Metal Inert Gas) welding and Mag welding, which are a kind of arc welding, it is necessary to grasp the state of the filler metal and to supply it appropriately.

  An object of this invention is to provide the welding apparatus which can grasp | ascertain the state of a filler material appropriately and can supply a filler material appropriately.

An object of the present invention is a welding apparatus that integrates a plurality of base materials with a molten filler material at a welding position,
A heating member for heating the wire of the base material and the filler material at the welding position;
A hollow wire guide that guides the welding position through the wire of the filler material;
A wire supply member that feeds the wire of the filler material to the welding position or pulls it back from the welding position;
A displacement measuring means for measuring a displacement in a predetermined member caused by a reaction force with respect to the feeding due to bending of the wire fed to the welding position by the wire supply member;
This is achieved by a welding device comprising: control means for controlling the feeding and pulling of the wire of the filler metal by the wire supply member based on the change of the displacement by the displacement measuring means.

In a preferred embodiment, the displacement measuring means has a movable member that rotatably supports the wire supply member,
The movable member is
A rotating shaft including a biasing member that biases the wire supply member in a predetermined direction;
A stopper for restricting rotation of the wire supply member in the predetermined direction at a predetermined position;
Rotation angle acquisition means for acquiring the rotation angle of the rotation shaft as a displacement,
The reaction force causes the wire supply member to rotate in a direction opposite to the predetermined direction against the bias, and the rotation angle acquisition unit acquires a rotation angle of a rotary shaft that rotates together with the wire supply unit. To do.

In another preferred embodiment, the displacement measuring means has a movable member that slidably supports the wire supply member,
The movable member is
A guide member for guiding the slide of the wire supply member;
A biasing member that biases the wire supply member in a predetermined direction;
A stopper for restricting sliding of the wire supply member in the predetermined direction at a predetermined position;
Distance acquisition means for acquiring a movement distance from the predetermined position of the wire supply member as a displacement;
The reaction force causes the wire supply member to slide in a direction opposite to the predetermined direction against the biasing by the biasing member, and the distance acquisition means moves the wire supply member from the predetermined distance. Get the distance.

In still another preferred embodiment, the wire guide has an elastically deformable portion,
The displacement measuring means has a movable member that rotatably supports one end of the elastically deformable portion,
A rotating shaft including a biasing member that biases the elastically deformable portion in a predetermined direction;
A stopper for restricting rotation of the elastically deformable member in the predetermined direction at a predetermined position;
Rotation angle acquisition means for acquiring the rotation angle of the rotation shaft as a displacement,
Due to the reaction force, the elastically deformable portion rotates in the direction opposite to the predetermined direction against the bias, and the rotation angle acquisition means acquires the rotation angle of the rotation shaft.

Moreover, in another preferable embodiment, the movable member is connected to an arm extending from the wire guide and holds the wire guide so as to be swingable about a rotation axis.
A biasing member that biases the arm and the rotating shaft in a predetermined direction;
A stopper for restricting rotation of the arm and the rotation shaft in the predetermined direction at a predetermined position;
Rotation angle acquisition means for acquiring the rotation angle of the rotation shaft as a displacement,
The reaction force causes the wire guide, the arm, and the rotation shaft to rotate in the direction opposite to the predetermined direction against the bias, and the rotation angle acquisition unit acquires the rotation angle of the rotation shaft.

In still another preferred embodiment, the apparatus has a movable member that is connected to an arm extending from the wire guide and has a sleeve member that slides the wire guide in parallel with a direction in which the wire extends. Biased in the direction,
A stopper for restricting sliding of the arm and the sleeve member toward the distal end of the wire at a predetermined position;
A movement distance acquisition means for acquiring a movement distance of the sleeve in the extending direction of the wire as a displacement;
The reaction force causes the wire guide, arm, and sleeve member to slide in a direction opposite to the tip direction of the wire against the bias, and the movement distance acquisition unit acquires the movement distance of the sleeve member. .

In a preferred embodiment, the wire guide is held and moved, and the wire guide holding / moving member is provided.
The wire guide holding / moving member has an arm member and a rotation shaft for rotating the arm member,
The displacement measuring means has a rotation angle acquisition means for acquiring a rotation angle of the rotation shaft of the wire guide holding / moving member as a displacement,
Due to the reaction force, the arm member of the wire guide holding / moving member rotates in one direction, and the rotation angle acquisition means acquires the rotation angle of the rotating shaft accompanying the rotation of the arm member.

In still another preferred embodiment, the device has a wire guide holding / moving member that holds and moves the wire guide,
The wire guide holding / moving member includes an arm member and a rotation shaft that rotates the arm member, and an arm member driving unit that is connected to the rotation shaft and rotates the arm member.
The displacement measuring means has a torque acquisition means for acquiring the torque in the arm member driving means as a displacement;
Due to the reaction force, the arm member of the wire guide holding / moving member is given a load in one direction, and the torque acquisition means acquires the torque as the load on the arm member increases.

In a preferred embodiment, the wire guide is held and moved, and the wire guide holding / moving member is provided.
The wire guide holding / moving member includes an arm member that holds the wire guide, and a driving unit that holds the horizontal position of the arm member and slides the arm member in a vertical direction;
The displacement measuring means has a slide amount acquisition means for acquiring a slide amount in the vertical direction of the arm member as a displacement;
Due to the reaction force, the arm member of the wire guide holding / moving member slides in one direction in the vertical direction, and the slide amount acquisition means acquires the slide amount by the slide of the arm member.

In another preferred embodiment, it has a wire guide holding / moving member that holds and moves the wire guide,
The wire guide holding / moving member has an arm member that holds the wire guide, and an arm holding member that holds the arm member,
The displacement measuring means includes a stress detecting means for detecting a stress in the arm member or the arm holding member as a displacement;
The reaction force causes stress in the arm member and the arm holding member of the wire guide holding / moving member, and the stress means acquires the stress in the arm member or the arm holding member.

  In a preferred embodiment, the control means has a supply total amount that is an accumulated amount of the supply amount of the wire supplied by the wire supply means after the displacement increases and reaches a first predetermined value. The wire supply member determines that welding at the welding position is completed when the displacement is greater than a predetermined amount and the displacement decreases to a second value smaller than the first value. Is configured to pull back the wire by a predetermined amount.

  In a more preferred embodiment, when the total amount of wires supplied by the wire supply unit is equal to or less than a predetermined value after the control unit has increased the displacement and reached the first predetermined value, When the displacement decreases to “0”, the wire is once pulled back by a predetermined amount by the wire supply member, and then the wire is again fed by the wire supply member.

  In a preferred embodiment, the control means is configured to stop the supply of the wire by the wire supply member after the displacement increases and reaches the first predetermined value.

In another preferred embodiment, the control means is configured such that after the displacement increases and reaches the first predetermined value, a total supply amount of the wires supplied by the wire supply means is equal to or less than a predetermined value. When the displacement decreases again and becomes equal to or smaller than a third predetermined value smaller than the first predetermined value,
Until the total wire supply amount exceeds the predetermined value, the wire is fed by the wire supply member,
When the total wire supply amount is less than or equal to the predetermined amount, the displacement increases and reaches a fourth predetermined value between the first predetermined value and a third predetermined value. Decelerate or stop the wire supply means,
Until the total wire supply amount exceeds the predetermined value, the wire is fed by the wire supply member,
When the total wire supply amount exceeds the predetermined value, it is determined that the welding at the welding position has been completed, and the wire supply member pulls back the wire by a predetermined amount.

  In a preferred embodiment, the control means calculates the amount of wire supplied by the wire supply member based on the amount of rotation of a roller provided on the wire supply member.

  In another preferred embodiment, the control means calculates the amount of wire supplied by the wire supply member based on the displacement.

  In addition, when applying this invention to a brazing apparatus, a brazing material is used as a filler material.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the welding apparatus which can grasp | ascertain the state of a filler material appropriately and can supply a filler material appropriately.

FIG. 1 is a diagram showing a schematic configuration of a brazing apparatus according to an embodiment of the present invention. FIG. 2 is a diagram illustrating a schematic configuration of the wire supply device according to the first embodiment. FIG. 3 is a diagram showing the stopper according to the present embodiment in more detail. FIG. 4 is a diagram showing an outline of the operation in the brazing apparatus according to the present embodiment. FIG. 5 is a diagram showing an outline of the operation in the brazing apparatus according to the present embodiment. FIG. 6 is a diagram showing an outline of the operation in the brazing apparatus according to the present embodiment. FIG. 7 is a diagram showing an outline of the operation in the brazing apparatus according to the present embodiment. FIG. 8 is a graph schematically showing an example of the displacement of the rotating shaft. FIG. 9 is a flowchart showing an example of a brazing sequence by the control device of the brazing device according to the present embodiment. FIG. 10 is a flowchart showing an example of a brazing sequence by the control device of the brazing device according to the present embodiment. FIG. 11 is a diagram illustrating a schematic configuration of the wire supply device according to the second embodiment. FIG. 12 is a partial cross-sectional view showing the movable member according to the present embodiment in more detail. FIG. 13 is a diagram illustrating an outline of an operation in the brazing apparatus according to the second embodiment. FIG. 14 is a diagram illustrating an outline of an operation in the brazing apparatus according to the second embodiment. FIG. 15 is a flowchart illustrating an example of a brazing sequence performed by the control device of the brazing device according to the second embodiment. FIG. 16 is a diagram showing a schematic configuration of a brazing device according to a third embodiment of the present invention. FIG. 17 is a diagram showing a schematic configuration of a brazing device according to a fourth embodiment of the present invention. FIG. 18 is a diagram showing a schematic configuration of a brazing apparatus according to the fifth embodiment of the present invention. FIG. 19 is a diagram showing a schematic configuration of a welding torch and its periphery in an arc welding apparatus. FIG. 20 is a diagram showing a schematic configuration of a brazing apparatus according to a sixth embodiment of the present invention. FIG. 21 is a diagram for explaining the outline of displacement detection according to the present embodiment. FIG. 22 is a flowchart showing an example of a brazing sequence by the control device of the brazing device according to the present embodiment. FIG. 23 is a flowchart showing an example of a brazing sequence by the control device of the brazing device according to the present embodiment. FIG. 24 is a flowchart illustrating an example of a brazing sequence by the control device of the brazing device according to the seventh embodiment. FIG. 25 is a flowchart illustrating an example of a brazing sequence by the control device of the brazing device according to the seventh embodiment. FIG. 26 is a diagram showing a schematic configuration of a brazing device according to an eighth embodiment of the present invention. FIG. 27 is a diagram for explaining the outline of displacement detection according to the present embodiment. FIG. 28 is a diagram showing a schematic configuration of a brazing apparatus according to a ninth embodiment of the present invention.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. In the present embodiment, the case where the present invention is applied to a brazing apparatus will be mainly described. FIG. 1 is a diagram showing a schematic configuration of a brazing apparatus according to an embodiment of the present invention. As shown in FIG. 1, the brazing device 10 according to the present embodiment includes a wire guide 12, a wire supply device 18, and a heater 22. The wire guide 12 is hollow, and the wire W supplied by the wire supply device 18 passes through the wire guide 12. A wire W protrudes from the tip 14 of the wire guide. The wire guide rear portion 16 is in contact with the wire supply device 18 and receives the wire W supplied from the wire supply device 18.

  The heater 22 is supplied with a mixture of acetylene gas and flux and oxygen from a combustion gas supply device (not shown) so that a flame F resulting from the combustion of the mixture and oxygen is emitted from the tip 24 thereof. It has become. The wire W protruding from the tip 14 of the wire guide reaches the brazing position between the first base material M1 and the second base material M2 to be brazed, and melts at a predetermined temperature. The molten brazing material flows together with the flux between the base material M1 and the base material M2, so that the base material M1 and the base material M2 are joined.

  Needless to say, a gas other than acetylene gas, for example, propane gas, can be used as the combustible gas. In the present embodiment, the flux is included in the air-fuel mixture, but it goes without saying that a configuration in which the flux is directly applied to the welding positions of the base materials M1 and M2 may be adopted. No.

  In the present embodiment, the supply of the wire W is controlled by the wire supply device 18 and a control device (not shown) as described later. FIG. 2 is a diagram illustrating a schematic configuration of the wire supply device according to the first embodiment. The wire supply device 18 supports a wire supply member 20 that feeds or pulls back a wire W, a base portion 25, an end wall 26 that stands upright from the base portion 25 and is connected to the wire guide rear portion 16, and the wire supply member 20 thereon. And a stopper 35 for restricting the movement of the movable member 30.

  The movable member 30 includes a movable member support portion 31 fixed to the base portion 25, a rotation shaft 32, and a wire supply device support base 33 attached to the rotation shaft 32. The rotating shaft 32 is biased in the direction of the arrow D1 by a spring or the like. The wire supply device support 33 moves as the rotation shaft 32 rotates. The wire supply member 20 is fixed to the upper surface of the wire supply device support base 33. The rotation shaft 32 is connected to a displacement sensor (not shown) for detecting the rotation angle.

  The wire supply member 20 includes a driving roller 36 having a motor (not shown) connected to its shaft, and a driven roller 37 that rotates as the driving roller rotates. A wire W is positioned between the driving roller 36 and the driven roller 37, and the wire W is moved in any direction of an arrow 200 as the driving roller 36 rotates. The wire W is fed by moving the wire W in the direction of R1, and the wire W is pulled back by moving the wire W in the direction of R2. The direction of R1 (direction in which the wire W is fed) is referred to as a forward direction, and the direction of R2 (direction in which the wire W is pulled back) is referred to as a reverse direction. The rotation of the drive roller 36 for moving the wire W in the forward direction is referred to as forward rotation, and the rotation of the drive roller 36 for moving the wire W in the reverse direction is referred to as reverse rotation.

FIG. 3 is a diagram showing the stopper according to the present embodiment in more detail. As shown in FIG. 3, the stopper 35 is attached to the base portion 25, and a support portion 41 that stands upright from the base portion 25, and a part of the lower surface thereof serves as a contact surface 43 and extends to contact the upper surface of the wire feeder support base 33. Part 42. In a state where the contact surface 43 and the upper surface of the wire supply device support base 33 are in contact, the upper surface of the wire supply device support base 33 is substantially parallel to the base portion 25. As shown in FIG. 2, the rotating shaft 32 is urged in the direction of the arrow D1. Therefore, normally, as shown in FIG. 3, the upper surface of the wire supply device support base 33 is in contact with the contact surface 43 of the stopper.

  An outline of the operation of the brazing apparatus 10 having the above-described configuration will be described with reference to FIGS. As shown in FIG. 4, initially, in order to join the base materials M1 and M2, with the wire guide 12 moved to a predetermined position, the wire supply device 20 is activated after a predetermined time of preheating. Then, the wire W is fed. As a result, the wire W advances from the opening 51 of the wire guide distal end portion 14 toward the downstream side (the brazing position between the base materials M1 and M2) as indicated by the arrow B, and the front end 52 of the wire W becomes the base material. It contacts the upper surface of M1. In this state, the brazing position of the wire W and the base materials M1 and M2 is heated by the flame F from the heater 22.

  Insufficient heating of the brazing position of the wire W and the base materials M1 and M2, that is, the wire W has not reached the melting temperature, and the tip 52 of the wire W remains in contact with the upper surface of the base material A Thus, in the wire supply member 20 of the wire supply device 18, the drive roller 36 operates to move the wire W in the forward direction. Therefore, as shown in FIG. 5, the reaction force of the wire W is generated when the driving roller 36 moves the wire W in the positive direction (arrow R1). This reaction force is against the feeding of the wire supply member 20 due to the bending of the wire W which is fed to the brazing position.

  Due to the reaction force of the wire W, the wire supply member 20 and the wire supply device support base 33 fixed to the wire supply member 20 tend to be displaced downward. Therefore, the rotating shaft 32 of the movable member 30 rotates in the direction D2 against the urging force. The rotation angle in the direction D2 is detected by a displacement sensor (not shown).

  The heater 22 further heats the brazing position of the wire W and the base materials M1 and M2, and when the melting temperature of the wire W is reached, the wire W is melted and melted as shown in FIG. The brazed material flows into the gap between the base materials M1 and M2 (see symbol BR). As the wire W melts, the tip 52 is separated from the upper surface of the base material M1. Accordingly, as shown in FIG. 7, the reaction force of the wire W disappears, and the rotating shaft 32 rotates in the direction D <b> 1 by the urging force, and the upper surface of the wire supply device support base 33 contacts the contact surface 43 of the stopper 35. It becomes a state.

  FIG. 8 is a graph schematically showing an example of the displacement of the rotating shaft 32. In the example shown in FIG. 8, when the wire comes into contact with the base material M <b> 1 and then the displacement becomes a certain amount, the supply of the wire by the drive roller 36 of the wire supply member 20 is stopped. As shown in FIG. 8, in the graph 800, the displacement increases from “0” after the contact of the wire with the base material M <b> 1 (see symbols a <b> 1, a <b> 2 and a <b> 3). When the displacement becomes a constant amount and the supply of the wire by the driving roller 36 is stopped, the displacement is maintained at that value. Even in this state, the temperature of the base material and the wire rises. Thereafter, when the wire starts to melt (see symbols b1, b2, and b3), the displacement returns to “0” relatively quickly thereafter (see symbols c1, c2, and c3). That is, in the range indicated by reference numerals 801 to 803, the temperatures of the base materials M1 and M2 rise, and at the points indicated by reference signs b1, b2, and b3, the temperatures of the base materials M1 and M2 rise and the wire starts to melt. . Thereafter, in the range indicated by reference numerals 811 to 813, the wire is continuously melted. Accordingly, in the range indicated by reference numerals 811 to 813, the melted wire flows into the gap between the base material M1 and the base material M2, and joins the base materials M1 and M2.

  Since the wire feed amount by the drive roller 36 of the wire supply member 20 is constant, the displacement increases approximately linearly as long as the drive roller 36 of the wire supply member operates. In the example of FIG. 8, the wire contact and the wire melting are repeated a plurality of times, but the increase amount (inclination) of the displacement is almost the same in each graph rise (see reference numerals 801 to 803). In addition, when the time from wire contact to wire melting is long, the time during which the wire is maintained at a constant amount becomes long. In FIG. 8, the graph is drawn with a straight line, but this is a schematic one, and actually, it is a broken line or a curve with details.

  In the present embodiment, a control device (not shown) inputs the displacement, and controls the motor that drives the driving roller 36 and the position of the brazing device based on the displacement. For example, the control device controls a motor for driving the drive roller 36 and a drive device (motor or hydraulic device) for sliding or rotating the brazing position.

  9 and 10 are flowcharts showing an example of a brazing sequence by the control device of the brazing device according to the present embodiment. The control device operates a driving device (not shown) so that the wire guide 12 of the brazing device 10 reaches the brazing position, and reaches the brazing position (step 901). When the wire guide 12 reaches the brazing position, the control device rotates the drive roller 36 of the wire supply member 20 in the forward direction and feeds the wire W to the brazing position (step 902).

The control device acquires the displacement from the displacement sensor attached to the rotating shaft 32 (step 903), and determines whether the displacement has increased to a predetermined value α or more (step 904). An increase in the displacement indicates that the wire W is in contact with the base material M1 in an unmelted state at the brazing position. The predetermined value α may be determined in advance. A larger value α means that more wires can be supplied. Therefore, although there is an upper limit, it is desirable that α be larger within that range. In particular, the predetermined value α is set in advance so that the corresponding wire supply amount W _α when the displacement is α is an amount necessary for brazing at one brazing position. The number of times of brazing at one brazing position can be reduced.

  When it is determined Yes in step 904, the control device stops the driving roller 36 of the wire supply member 20 (step 905). Next, the control device determines whether or not the total wire supply amount is equal to or greater than a predetermined amount A (step 906). Note that the total wire supply amount initially corresponds to one wire supply amount. In the present embodiment, the predetermined amount A corresponds to the amount of solder required for brazing at a certain brazing position. The wire supply amount is determined by the rotation of the drive roller 36 from the timing when the tip of the wire W comes into contact with the upper surface of the base material M1 and the displacement of the rotary shaft 32 increases until the drive roller 36 stops (see step 905). Can be obtained from the quantity. Alternatively, the control device may calculate the wire supply amount based on the displacement of the displacement sensor. If a conversion formula between the displacement of the displacement sensor and the wire supply amount (for example, wire supply amount = p × displacement (p is a constant)) is used, the wire supply amount can be calculated from the displacement.

  When it is determined Yes in step 906, the control device determines whether or not the displacement has decreased to be equal to or less than a predetermined value β1 (α> β1> 0) (step 907). If it is determined Yes in step 907, the wire W is being melted and the brazing position is joined by the melted solder. Therefore, when it is determined Yes in step 907, the control device reversely rotates the driving roller 36 of the wire supply member 20 by a predetermined amount (step 908). It is determined that brazing at the brazing position is completed, and then the control device moves the wire guide 12 to the next brazing position.

  When it is determined Yes in step 907, an amount sufficient for one brazing is supplied. Therefore, the base materials M1 and M2 are firmly joined at the brazing position by the melting solder. Step 908 is executed because it is necessary to keep the wire W away from the flame in order to prevent the tip of the wire W (see, for example, reference numeral 52 in FIG. 6) from becoming spherical due to the flame of the heater 22.

  On the other hand, when it is determined No in step 906, the control device determines whether or not the displacement is “0” (step 909). If it is determined Yes in step 909, the wire W is almost completely melted. Even when it is determined Yes in step 909, the control device reversely rotates the drive roller 36 of the wire supply member 20 by a predetermined amount (step 910).

  Next, the control device sets a predetermined time in the built-in timer and starts the timer (step 1001). When the predetermined time has elapsed, the control device again rotates the drive roller of the wire supply member 20 in the normal direction again (step 1002).

  The control device acquires the displacement from the displacement sensor attached to the rotating shaft 32 (step 1003), and determines whether or not the displacement has increased to a predetermined value α or more (step 1004). When it becomes Yes in step 1004, the control device stops the roller (step 1005). Thereafter, when determining that the displacement has decreased (Yes in Step 1006), the control device determines whether or not the total supply amount of the wire is equal to or greater than the predetermined amount A (Step 1007). The total supply amount of the wire may be obtained by adding the supply amount of the wire supplied by the current roller forward rotation (see step 1002) to the original total supply amount of the wire.

  If YES is determined in step 1007, the process proceeds to step 908, and the control device reversely rotates the drive roller 36 of the wire supply member 20 by a predetermined amount, and then moves the wire guide 12 to the next brazing position. Move. If it is determined in step 1006 that the displacement has decreased, the wire is being melted and bonding at the brazing position with the melted brazing has been performed. At this time, if the total supply amount of the wire is sufficient for brazing at the brazing position, it is determined that brazing at the brazing position is completed.

  On the other hand, if it is determined No in step 1007, the control device determines whether or not the displacement has further decreased to “0” (step 1008). If it is determined Yes in step 1008, the control device reversely rotates the driving roller 36 of the wire supply member 20 by a predetermined amount and returns to step 1001. In this way, steps 1001 to 1009 are repeated until the total wire supply amount is sufficient for brazing at a certain brazing position.

  In the present embodiment, the control device can obtain the reaction force of the wire as the displacement (rotation angle) of the rotation shaft 32 of the movable member 30. Further, the control device can determine contact of the wire W with the base material and melting of the wire W based on the displacement. Thereby, the feeding and pulling back of the wire W can be appropriately controlled. Further, the supply amount of the brazing material at the brazing position can be calculated based on the time interval at which the displacement occurs. This makes it possible to supply an appropriate amount of brazing material at the brazing position.

  Next, a second embodiment of the present invention will be described. In the first embodiment, the control device is configured to acquire the reaction force of the wire as the displacement (rotation angle) of the rotation shaft 32 of the movable member 30. In the second embodiment, the wire reaction force is expressed as a displacement of the wire supply member 20 in a direction parallel to the direction in which the wire W extends.

  FIG. 11 is a diagram illustrating a schematic configuration of the wire supply device according to the second embodiment. In the wire supply device 118 according to the second embodiment, the same components as those of the wire supply device 18 according to the first embodiment are denoted by the same reference numerals. As shown in FIG. 11, the wire supply device 118 according to the second embodiment includes a wire supply member 20, a base portion 25, a side wall 26, a movable member 130, and a stopper 135. In the wire supply device 118 according to the second embodiment, the wire supply member 20 can be moved, that is, slid by the movable member 130 in parallel with the wire W (see arrow 121). Further, the wire supply member 20 is urged in the direction of the arrow D4 by a spring or the like in the movable member 130. Initially, the downstream surface (left side in FIG. 11) of the wire supply device 130 is the stopper 135. In contact with. In addition, the movable member support portion 120 is fixed to the base portion 25 of the wire supply device 118.

  FIG. 12 is a partial cross-sectional view showing the movable member 130 according to the present embodiment in more detail. As shown in FIG. 12, the movable member 130 moves the sliding member parallel to the wire W at each of the sliding member 131 attached to the lower end of the wire supply member 20 and the side end portion of the sliding member 131. And guide members 132 and 133 for guiding the movement. The lower surface of the sliding member 131 is smooth so that the upper surface of the movable member support portion 120 can be slid.

  An outline of the operation of the brazing apparatus according to the second embodiment will be described with reference to FIGS.

  As in the first embodiment, as shown in FIG. 4, initially, in order to join the base materials M1 and M2, the wire guide 12 has been moved to a predetermined position for a certain period of time. After preheating, the wire supply device 20 is activated and the wire W is fed. As a result, the wire W advances from the opening 51 of the wire guide distal end portion 14 toward the downstream side (the brazing position between the base materials M1 and M2) as indicated by the arrow B, and the front end 52 of the wire W becomes the base material. It contacts the upper surface of M1. In this state, the brazing position of the wire W and the base materials M1 and M2 is heated by the flame F from the heater 22.

  Insufficient heating of the brazing position of the wire W and the base materials M1 and M2, that is, the wire W has not reached the melting temperature, and the tip 52 of the wire W remains in contact with the upper surface of the base material A In the wire supply member 20 of the wire supply device 118, the drive roller 36 operates to move the wire W in the forward direction. Therefore, as shown in FIG. 13, the driving roller 36 moves the wire W in the positive direction (arrow R1), so that a reaction force of the wire W is generated. By the reaction force of the wire W, the wire supply member 20 is moved in the direction of the arrow D3 by the movable member 130. The amount of movement in the direction of arrow D3 is detected by a displacement sensor (not shown).

The heater 22 further heats the brazing position of the wire W and the base materials M1 and M2, and when the melting temperature of the wire W is reached, the wire W is melted and melted as shown in FIG. The brazed material flows into the gap between the base materials M1 and M2 (see symbol BR). As the wire W melts, the tip 52 is separated from the upper surface of the base material M1. Therefore, as shown in FIG. 14, since the reaction force of the wire W is lost, the wire supply member 20 moves rapidly in the direction D4 by the urging force of the movable member 130, and the downstream surface of the wire supply member 20 is Stopper 1
It will be in the state which contacts 35.

  Also in the second embodiment, assuming that the direction D3 in FIG. 13 is positive, the displacement of the wire supply member 20 and the state of the wire W can be expressed in substantially the same manner as the graph shown in FIG. Therefore, the control device can control the brazing device according to the processing flow shown in FIGS. 9 and 10 as in the first embodiment.

  In the second embodiment, the control device can obtain the reaction force of the wire as a displacement parallel to the wire W of the wire supply member 20. Further, the control device can determine the contact of the wire W with the base material and the melting of the wire W based on the obtained displacement.

  Further, in the second embodiment, the displacement matches the supplied length of the wire. Therefore, in the second embodiment, the supply amount of the wire based on the displacement can be easily and accurately calculated.

  The present invention is not limited to the above embodiments, and various modifications can be made within the scope of the invention described in the claims, and these are also included in the scope of the present invention. Needless to say.

  For example, in the above-described embodiment, when the displacement is reduced to 0 (see Step 909 in FIG. 9), the drive roller 36 is once rotated in the reverse direction to once separate the wire W from the brazing position (Step 910). reference). However, it is not limited to such a sequence. FIG. 15 is a flowchart showing another example of the brazing sequence according to the present embodiment. The processing in steps 901 to 908 in FIG. 9 is the same as that in the first embodiment.

  When it is determined No in step 906, that is, when the total wire supply amount is less than the predetermined amount A, the control device decreases the displacement to be equal to or less than a predetermined value β2 (α> β2> 0). It is determined whether or not (step 1501). If it is determined Yes in step 1501, the wire W is being melted, and the brazing position is joined by the melted solder.

  If YES in step 1501, the control device rotates the drive roller 36 of the wire supply member 20 in the forward direction to feed the wire to the brazing position (step 1502), and further measures the displacement (step). 1503). If the total wire supply amount is equal to or greater than the predetermined value A (Yes in step 1504), the control device proceeds to step 908, reverses the drive roller 36 of the wire supply member 20 by a predetermined amount, and brazes it. After it is determined that the brazing at the position is completed, the wire guide 12 is moved to the next brazing position.

  When it is determined No in step 1504, the control device determines whether or not the acquired displacement has increased to a value γ (α> γ> β2) or more (step 1505). The increase in displacement means that the molten brazing material (wire) is fed in by normal rotation, the brazing material is melted, and the wire W is continuously in contact with the base material M1 at the brazing position. It means that If NO is determined in step 1505, the process returns to step 1504. If the amount is sufficient for brazing at the brazing position (Yes in step 1504), the process proceeds to step 908.

  When it is determined Yes in step 1505, the control device decelerates or stops the driving roller 36 of the wire supply member 20 (step 1506). Next, if the total wire supply amount is equal to or greater than the predetermined value A (Yes in step 1507), the control device proceeds to step 908, and reversely rotates the drive roller 36 of the wire supply member 20 by a predetermined amount. After it is determined that the brazing at the brazing position is completed, the wire guide 12 is moved to the next brazing position.

  If it is determined No in step 1507, it is determined whether the displacement has decreased to a predetermined value β2 (α> β2> 0) or less (step 1508). If it is determined No in step 1508, the process returns to step 1507, and if the amount is sufficient for brazing at the brazing position (Yes in step 1507), the process proceeds to step 908.

  If it is determined Yes in step 1508, the process returns to step 1502, and the processing in steps 1502-1508 is repeated.

  In the second embodiment, since the wire is continuously supplied in the series of processes of FIG. 15, the time required for brazing can be shortened. In addition, in the state where the wire is continuously supplied while the wire and the base material are in contact with each other, the brazing at a certain brazing position is completed when the total amount of wire supply exceeds a predetermined amount A. It is also possible to make the amount of brazing material used in the case appropriate.

  In the first embodiment and the second embodiment, the displacement (rotation amount or sliding movement amount) in the wire supply member 20 is measured, but the displacements in other members are measured. Also good. FIG. 16 is a diagram showing a schematic configuration of a brazing device according to a third embodiment of the present invention. In FIG. 16, the same components as those in the first embodiment are denoted by the same reference numerals.

  As shown in FIG. 16, the brazing device 200 according to the third embodiment includes a wire guide 212 and a wire supply device 218. In the wire supply device 218 according to the third embodiment, the wire supply member 20 is fixed, and its position does not change due to the reaction force of the wire. On the other hand, the wire guide has an elastically deformable central portion 218 between the wire guide front end portion 214 and the wire guide rear portion 216. In addition, the movable member 230 is provided at one end of the central portion 218 (a connection portion between the central portion 218 and the wire guide rear portion 216). The movable member 230 has a rotation shaft 232, and the central portion 218 is rotatable. A displacement sensor is provided on the rotation shaft, and the rotation angle of the central portion 218 can be obtained.

  In addition, the central portion 218 is biased by a biasing member such as a spring so that the central portion 218 is in a position indicated by a solid line in FIG. In addition, the movable member 230 has a stopper (not shown) so as to stop the central portion 218 at the position indicated by the solid line.

  In this example, the central portion 218 of the wire guide rotates in the direction of the arrow against the urging by the urging member due to the reaction force of the wire W, whereby the central portion 218 has a shape as indicated by a broken line. And position (see reference numeral 218b). At this time, if the rotation angle is acquired as the displacement, the supply of the wire can be controlled as in the first embodiment.

  Next, a fourth embodiment of the present invention will be described. The fourth embodiment is also configured to acquire the displacement of the wire guide as in the third embodiment. FIG. 17 is a diagram showing a schematic configuration of a brazing device according to a fourth embodiment of the present invention. In FIG. 17 as well, the same components as those in the first to third embodiments are denoted by the same reference numerals.

  As shown in FIG. 17, the brazing device 300 according to the fourth embodiment includes a wire guide 312, a wire supply device 218, and a movable member 330. The wire guide 312 has a first flexible tube 316 on the upstream side (wire supply device 218 side). The first flexible tube 316 has one end connected to the wire supply device 218 and the other end connected to the movable member 330. In addition, the wire guide 312 has a second flexible tube 318 on the downstream side. The second flexible tube 318 has one end connected to the movable member 330 and the other end connected to the wire guide tip 314.

  Each of the first flexible tube 316 and the second flexible tube 318 is hollow, and a wire can pass therethrough. For example, the first flexible tube 316 has a structure in which a thin coil-shaped metal body is covered with a resin such as rubber. The second flexible tube 318 is also similar to the first flexible tube 316, but it is desirable that the second flexible tube 318 has more flexibility because the shape changes depending on the movable member.

  The movable member 330 extends in parallel with the direction in which the wire extends, and includes a wire guide support portion 334 that supports the wire guide, a rotating shaft 332 disposed near the center of the wire guide support portion 334, and an end portion of the wire guide support portion 334. Thus, a connecting portion 336 extending upright with respect to the wire guide support portion 334 and a stopper 338 extending from the end of the connecting portion 336 in parallel with the direction in which the wire extends are provided.

  An arm 340 extends from the rotation shaft 332, and a wire guide tip 314 is attached to the tip of the arm 340. The arm 340 can swing with the rotation of the rotation shaft 332. The rotation shaft 332 is provided with a displacement sensor, and the rotation angle (that is, the rotation angle of the arm 340) can be obtained as the displacement.

  The rotating shaft 332 is urged in the direction of arrow D5 by a spring (not shown) or the like so that the lower surface of the arm 340 is in contact with the upper surface of the stopper 338. Further, the stopper 338 prevents the arm 340 from being lower than the position shown in FIG.

  In the fourth embodiment, the wire guide tip 314 moves in the upstream direction due to the reaction force of the wire W, and accordingly, the arm 340 rotates about the rotation shaft 332 in the arrow D6 direction. . Therefore, if the sensor acquires the rotation angle of the rotating shaft 332 as a displacement, it becomes possible to control the supply of the wire, as in the first embodiment, the third embodiment, and the like.

  Next, a fifth embodiment of the present invention will be described. Also in the fifth embodiment, the displacement of the wire guide is detected, but the movement parallel to the extending direction of the wire is acquired as the displacement, not the rotation angle of the wire guide.

  FIG. 18 is a diagram showing a schematic configuration of a brazing apparatus according to the fifth embodiment of the present invention. In FIG. 17 as well, the same components as those in the first to third embodiments are denoted by the same reference numerals.

  As shown in FIG. 18, the brazing device 400 according to the fifth embodiment includes a wire guide 412, a wire supply device 218, and a movable member 430. The wire guide 412 has a first flexible tube 316 on the upstream side (wire supply device 218 side). The first flexible tube 316 has one end connected to the wire supply device 218 and the other end connected to the movable member 430. Further, the wire guide 412 has a second flexible tube 318 on the downstream side. The second flexible tube 318 has one end connected to the movable member 430 and the other end connected to the wire guide tip 314.

  As in the fourth embodiment, the first flexible tube 316 and the second flexible tube 318 are each hollow, and a wire can pass therethrough. For example, the first flexible tube 316 has a structure in which a thin coil-shaped metal body is covered with a resin such as rubber. The second flexible tube 318 is also similar to the first flexible tube 316, but it is desirable that the second flexible tube 318 has more flexibility because the shape changes depending on the movable member.

  The movable member 430 extends in parallel with the direction in which the wire extends, and includes a wire guide support portion 334 that supports the wire guide, a sleeve member 432 that surrounds the wire guide support portion 334, and an end portion of the wire guide support portion 334. It has the connection part 336 extended upright with respect to the wire guide support part 334, and the stopper 338 extended in parallel with the extending direction of a wire from the edge part of the connection part 336.

  An arm 340 extends from the sleeve member 432, and a wire guide tip 314 is attached to the tip of the arm 340. The arm 340 is movable in parallel with the extending direction of the wire as the sleeve member moves. The sleeve member 432 or the wire guide support member 334 is provided with a displacement sensor, and the movement of the sleeve member 432 can be obtained as a displacement.

  The sleeve member 432 is biased in the direction of the arrow D7 by gravity or a spring, and initially, the position of the sleeve member 432 is maintained by the lower surface of the arm 340 coming into contact with the upper surface of the stopper 338. That is, the stopper 338 prevents the sleeve member 432 from moving downstream from the position shown in FIG.

  In the fifth embodiment, the wire guide tip 314 moves in the upstream direction by the reaction force of the wire W, and accordingly, the arm 340 and the sleeve member 432 move in the direction of the arrow D8. Therefore, if the sensor acquires the movement of the sleeve member 432 parallel to the direction in which the wire extends as a displacement, it becomes possible to control the supply of the wire as in the second embodiment.

  Moreover, in the said embodiment, although this invention was applied to the brazing apparatus, it is also possible to apply this invention to the arc welding apparatus which performs MIG welding or MAG welding. MIG welding uses only an inert gas (for example, argon or helium) as a shielding gas in arc welding, while MAG welding is an arc welding method, where inert gas and carbon dioxide are used as shielding gas. Is used.

  When the present invention is used in an arc welding apparatus for mag welding or MIG welding, the wire guide (wire guide tip 14) of the brazing apparatus according to the first to fifth embodiments is used. Replace with a welding torch (welding gun). Further, the heater 22 is not used.

  FIG. 19 is a diagram showing a schematic configuration of a welding torch and its periphery in an arc welding apparatus. As shown in FIG. 19, the welding torch 414 includes a main body 415 to which a gas nozzle is attached and a contact tip 416 for supplying electricity to the wire. The base material M1 is connected to one electrode of a welding machine (not shown) that supplies electric power, and the contact tip 416 is also connected to the other electrode of the welding machine (not shown).

  In such an arc welding apparatus, the filler metal wire W is energized via the contact tip 416. Therefore, when the wire W approaches the base material M1, an arc is formed by the current applied through the contact tip 416. On the other hand, shield gas is ejected from the tip 417 of the main body 415 of the welding torch 414 (see reference numeral 418), and the arc is cut off from the air. The base materials M1 and M2 and the filler metal are melted by the heat generated by the arc, and the base materials M1 and M2 are joined at the welding position 419.

  Even when performing the MIG welding and the MAG welding, by providing the wire supply device and the movable member shown in the first to fifth embodiments, the wire W can be moved based on the displacement in the movable member. Feeding can be controlled.

  Next, a sixth embodiment of the present invention will be described. In the first embodiment, the reaction force of the wire is obtained as the displacement (rotation angle) of the rotation shaft 32 of the movable member 30 in the wire supply member 20. In the second embodiment, the reaction force of the wire is obtained as the amount of movement of the wire supply member 20 parallel to the wire W. However, the reaction force of the wire can also be acquired at other than the wire supply member 20. In the sixth embodiment, in the device that holds the wire guide, the reaction force of the wire is acquired as the displacement. FIG. 20 is a diagram showing a schematic configuration of a brazing apparatus according to a sixth embodiment of the present invention. In the sixth embodiment, a wire guide holding / moving device 520 (hereinafter simply referred to as “holding / moving device”) that moves while holding the wire guide 512 is also illustrated.

  As shown in FIG. 20, a brazing device 510 according to the sixth embodiment includes a wire guide 512 and a holding / moving device 520 that holds the wire guide 512. The wire guide 512 is connected to the wire supply device 518 via the wire guide holding member 522 of the holding / moving device 520. A hollow flexible tube 519 extends from the wire supply device 518. The wire W passes through the flexible tube 519, protrudes from the tip of the wire guide 512 through the wire supply device 518 and the wire guide 512, respectively.

  The holding / moving device 520 includes a wire guide holding member 522, a distal end portion 524, an upper arm 526, a lower arm 528, and a turning member 530. The swivel member 530 is attached to the base 532 so as to be rotatable about a shaft (not shown) arranged in the vertical direction. An upper arm driving member 534 is disposed between the upper arm 526 and the lower arm 528, and a lower arm driving member 536 is disposed between the turning member 530 and the lower arm 528.

  A wire guide rotation shaft 540 protrudes from the tip 524, and the tip of the wire guide rotation shaft 540 is connected to the wire guide holding member 522. A motor (not shown) is connected to the wire guide rotating shaft 540 and can be rotated by a control signal from a control device (not shown). Further, the distal end portion 524 has a vertical movement rotating shaft 542. A motor (not shown) is also connected to the vertical movement rotary shaft 542, and is rotated by a control signal from a control device (not shown) to move the wire guide 512 up and down around the vertical movement rotary shaft 542. Yes (see arrow 2001).

  The upper arm driving member 534 also has a rotation shaft 544. A motor (not shown) is also connected to the rotating shaft 544 and is rotated by a control signal from a control device (not shown), and the upper arm 526 can be moved up and down around the rotation 544 (arrow 2002). reference). Similarly, the lower arm driving member 536 has a rotation shaft 546. A motor (not shown) is also connected to the rotating shaft 546 and is rotated by a control signal from a control device (not shown), and the lower arm 528 can be moved up and down around the rotation 546 (arrow 2003). reference).

  In the present embodiment, the displacement generated by the reaction force of the wire is detected at the rotation shaft 544 of the upper arm driving member 534. The detection of the displacement is not limited to the rotation shaft 544 of the upper arm driving member 534, but the vertical movement rotating shaft 542 of the tip 524 and the rotation shaft 546 of the lower arm driving member 536 are also detected by the same means or processing. It is possible to detect.

  FIG. 21 is a diagram for explaining the outline of displacement detection according to the present embodiment. As shown in FIG. 21, an angle sensor 550 such as a potentiometer is attached to the rotation shaft 544 according to the present embodiment, and the rotation angle of the rotation shaft 544 from a predetermined reference position can be detected. The motor (not shown) of the upper arm driving member 534 is controlled to be held at a desired position against the gravity when the wire guide 512 reaches the welding position, and a temporary force other than the gravity is used. In response to this, it can be rotated around the rotation shaft 544.

  A position indicated by a solid line in FIG. 21 is a position where the wire guide 512 and the upper arm 526 are held. When the wire supply device 518 continues to supply the wire while the tip of the wire W is in contact with the upper surface of the base material A (see reference numeral 2100), a reaction force of the wire W is generated, thereby causing the wire guide. 512 is moved upward (see reference numeral 2101). As the wire guide 512 moves upward, the upper arm 526 connected to the wire guide 512 also rotates in the direction of the arrow 2103 around the rotation shaft 544. The rotation angle an at this time is detected by the angle sensor 550 as a displacement.

  22 and 23 are flowcharts showing an example of a brazing sequence by the control device of the brazing device according to the present embodiment. The control device operates the holding / moving device 520 so that the wire guide 512 reaches the brazing position, and reaches the brazing position (step 2201). When the wire guide 512 reaches the brazing position, the control device rotates the motor (not shown) of the wire supply device 518 in the normal direction to drive the driving roller (not shown) and feeds the wire W to the brazing position. (Step 2202).

The control device acquires a change in angle (displacement angle) from the predetermined reference position of the rotating shaft 544 from the angle sensor 550 (step 2203). The displacement angle takes a positive value in the direction of the arrow 2103 in FIG. The control device determines whether or not the displacement angle an has increased to a predetermined value X or more (step 2204). An increase in the displacement angle indicates that the wire W is in contact with the base material M1 in an unmelted state at the brazing position. The predetermined value X may be determined in advance. The predetermined value X is set in advance so that the wire supply amount W _an corresponding to the displacement angle an coincides with X is _an amount necessary for brazing at one brazing position. Thus, the number of times of brazing at one brazing position can be reduced.

  When it is determined Yes in step 2204, the control device stops the motor (not shown) of the wire supply member 518 and stops the feeding of the wire W (step 2205). Next, the control device determines whether or not the total wire supply amount is equal to or greater than a predetermined amount A (step 2206).

  Note that the total wire supply amount initially corresponds to one wire supply amount. In the present embodiment, the predetermined amount A corresponds to the amount of solder required for brazing at a certain brazing position. Further, when the wire supply amount ends in one operation, that is, when it is determined Yes in step 2206 in FIG. 22, the displacement angle X (see step 2204) and the displacement angle Y (see step 2207) It can be calculated based on the difference (X−Y). Further, when the number of movements is two or more, that is, when the processing shown in FIG. 23 is also executed, the calculation can be performed based on (displacement angle X × number of movements) + (decrease in displacement angle in step 2306) it can.

  When it is determined Yes in step 2206, the control device determines whether or not the displacement angle has decreased to a predetermined value Y (X> Y> 0) or less (step 2207). When it is determined Yes in step 2207, the wire W is being melted and the brazing position is joined by the melted solder. Therefore, if it is determined Yes in step 2207, the control device reversely rotates the motor of the wire supply device 518 by a predetermined amount to pull back the wire W by a predetermined amount (step 2208). It is determined that brazing at the brazing position is completed, and then the control device controls the holding / moving device 520 to move the wire guide 512 to the next brazing position.

  When it is determined Yes in step 2206, an amount sufficient for one brazing is supplied. Therefore, the base materials M1 and M2 are firmly joined at the brazing position by the melting solder. Step 2208 is performed because it is necessary to keep the wire W away from the flame in order to prevent the tip of the wire W from becoming spherical due to the flame of the heater (not shown).

  On the other hand, when it is determined No in step 2206, the control device determines whether or not the displacement angle is “0” (step 2209). If it is determined Yes in step 2209, the wire W is almost completely melted. Also when it is determined Yes in step 2209, the control device reversely rotates the motor of the wire supply device 518 by a predetermined amount and pulls the wire W back by a predetermined amount (step 2210).

  Next, the control device sets a predetermined time in the built-in timer and starts the timer (step 2301). When the predetermined time has elapsed, the control device again rotates the motor of the wire supply device 518 in the normal direction and feeds the wire W (step 2302).

  The control device acquires a change in angle (displacement angle) from the predetermined reference position of the rotating shaft 544 from the angle sensor 550 (step 2303). The control device determines whether or not the displacement angle an has increased to a predetermined value X or more (step 2304). When it becomes Yes in step 2304, the control device stops the motor of the wire supply device 518 and stops the feeding of the wire W (step 2305). Thereafter, when the control device determines that the displacement angle has decreased (Yes in Step 2306), it determines whether or not the total supply amount of the wire is equal to or greater than the predetermined amount A (Step 2307). The total supply amount of the wire may be obtained by adding the supply amount of the wire supplied by the current forward rotation of the motor of the wire supply device 518 (see step 2302) to the total supply amount of the original wire.

  If YES is determined in step 2307, the process proceeds to step 2208, and the control device reversely rotates the motor of the wire supply device 518 by a predetermined amount to pull back the wire by a predetermined amount, and then the next brazing position. Until then, the wire guide 512 is moved by controlling the holding / moving device 520 to the next brazing position. If it is determined in step 2306 that the displacement angle has decreased, the wire is being melted and bonding at the brazing position with the melted brazing has been performed. At this time, if the total supply amount of the wire is sufficient for brazing at the brazing position, it is determined that brazing at the brazing position is completed.

  On the other hand, if it is determined No in step 2307, the control device determines whether or not the displacement angle has further decreased to “0” (step 2308). If it is determined Yes in step 2308, the control device reversely rotates the motor of the wire supply device 518 by a predetermined amount to pull back the wire by a predetermined amount, and then returns to step 2301. In this manner, steps 2301 to 2309 are repeated until the total wire supply amount is sufficient for brazing at a certain brazing position.

  In the present embodiment, the control device holds the wire guide 512 and moves the reaction force of the wire W by the rotating shaft of the holding / moving device 520 (in this embodiment, the upper arm that drives the upper arm 526). Acquired as the displacement angle of the rotation axis 544) of the drive member 534. The control device can determine contact of the wire W with the base material and melting of the wire W based on the obtained displacement angle. Thereby, the feeding and pulling back of the wire W can be appropriately controlled. Moreover, the supply amount of the brazing material at the brazing position can be calculated based on the displacement angle. This makes it possible to supply an appropriate amount of brazing material at the brazing position.

  Similarly, the reaction force of the wire W can be regarded as another displacement of the rotation shaft of the holding / moving device 520. For example, the rotating shaft 544 of the upper arm driving member 534 may be connected to a motor (not shown) via a torque sensor (not shown). In the torque sensor, the torque value tr increases as the load applied to the rotating shaft 544 increases. Therefore, in the seventh embodiment, the reaction force of the wire W is acquired as the torque value tr of the rotating shaft 544 to control the brazing device.

  24 and 25 are flowcharts showing an example of a brazing sequence by the control device of the brazing device according to the seventh embodiment. The control device operates the holding / moving device 520 to reach the brazing position so that the wire guide 512 of the brazing device 10 reaches the brazing position (step 2401). When the wire guide 512 reaches the brazing position, the control device rotates the motor (not shown) of the wire supply device 518 in the normal direction to drive the driving roller (not shown) and feeds the wire W to the brazing position. (Step 2402).

The control device acquires the torque value tr from the torque sensor of the rotating shaft 544 (step 2403), and determines whether or not the torque value tr has increased to a predetermined value p or more (step 2404). An increase in the torque value indicates that the wire W is in contact with the base material M1 in an unmelted state at the brazing position. Note that the predetermined value p may be determined in advance. A larger value p means that more wires can be supplied. Therefore, although there is an upper limit, it is desirable that p is larger within that range. In particular, a predetermined value p, the wire feed amount W _p of the torque value tr corresponds to when p is preset so that the amount necessary to brazing at brazing position of one place Thus, it is possible to reduce the number of times of brazing at one brazing position.

  When it is determined Yes in step 2404, the control device stops the motor (not shown) of the wire supply device 518 and stops the feeding of the wire W (step 2405). Next, the control device determines whether or not the total wire supply amount is equal to or greater than a predetermined amount A (step 2406).

  Note that the total wire supply amount initially corresponds to one wire supply amount. In the present embodiment, the predetermined amount A corresponds to the amount of solder required for brazing at a certain brazing position. The wire supply amount is stopped when the tip of the wire W comes into contact with the upper surface of the base material M1 and the torque value acquired from the torque sensor of the rotating shaft 544 increases (see step 2405). Up to the rotation amount of the motor shaft (not shown) of the wire supply device 518 can be obtained.

  If it is determined Yes in step 2406, the control device determines whether the torque value has decreased to a predetermined value q (p> q> 0) or less (step 2407). If it is determined Yes in step 2407, the wire W is being melted and the brazing position is joined by the melted solder. Therefore, when it is determined Yes in step 2407, the control device reversely rotates the motor of the wire supply device 518 by a predetermined amount and pulls back the wire W by a predetermined amount (step 2408). It is determined that brazing at the brazing position is completed, and then the control device controls the holding / moving device 520 to move the wire guide 512 to the next brazing position.

  When it is determined Yes in step 2407, an amount sufficient for one brazing is supplied. Therefore, the base materials M1 and M2 are firmly joined at the brazing position by the melting solder. Step 2408 is performed because it is necessary to keep the wire W away from the flame in order to prevent the tip of the wire W from becoming spherical due to the flame of the heater (not shown).

  On the other hand, if it is determined No in step 2406, the control device determines whether or not the torque value has become “0” (step 2409). If it is determined Yes in step 2409, the wire W is almost completely melted. Also when it is determined Yes in step 2409, the control device reversely rotates the motor of the wire supply device 518 by a predetermined amount and pulls the wire W back by a predetermined amount (step 2410).

  Next, the control device sets a predetermined time in the built-in timer and starts the timer (step 2501). When the predetermined time elapses, the control device rotates the motor of the wire supply device 518 forward again to feed the wire W (step 2502).

  The control device acquires the torque value tr from the torque sensor of the rotating shaft 544 (step 2503), and determines whether the torque value tr has increased to a predetermined value p or more (step 2504). When it becomes Yes in step 2504, the control device stops the motor of the wire supply device 518 and stops the feeding of the wire W (step 2505). Thereafter, when the control device determines that the torque value tr from the torque sensor of the rotating shaft 544 has decreased (Yes in step 2506), the control device determines whether or not the total supply amount of the wire is equal to or greater than the predetermined amount A (step). 2507). The total supply amount of the wire may be obtained by adding the supply amount of the wire supplied by feeding the current wire W (see step 2502) to the total supply amount of the original wire.

  If YES is determined in step 2507, the process proceeds to step 2408, and the control device reversely rotates a motor (not shown) of the wire supply device 518 by a predetermined amount and pulls back the wire W, and then holds and moves. The apparatus 520 is controlled to move the wire guide 12 to the next brazing position. If it is determined in step 2506 that the torque value tr has decreased, the wire is being melted and bonding at the brazing position with the melted brazing has been performed. At this time, if the total supply amount of the wire is sufficient for brazing at the brazing position, it is determined that brazing at the brazing position is completed.

  On the other hand, if it is determined No in step 2507, the control device determines whether or not the torque value tr from the torque sensor of the rotating shaft 544 further decreases to “0” (step 2508). . If YES in step 2508, the control device reversely rotates a motor (not shown) of the wire supply device 518 by a predetermined amount to pull back the wire W by a predetermined amount, and returns to step 2501. In this way, steps 2501 to 2509 are repeated until the total wire supply amount is sufficient for brazing at a certain brazing position.

  In the present embodiment, the control device acquires the reaction force of the wire W as a torque value at the rotation shaft 544 of the upper arm drive member 534, and the control device applies the base material of the wire W based on the torque value. Contact and melting of the wire W can be determined. Thereby, the feeding and pulling back of the wire W can be appropriately controlled.

  In the sixth embodiment and the seventh embodiment, the reaction force of the wire W is acquired as the displacement of the rotation axis of the holding / moving device, but is acquired as the displacement of the other part of the holding / moving device. It is also possible. FIG. 26 is a diagram showing a schematic configuration of a brazing device according to an eighth embodiment of the present invention.

  As shown in FIG. 26, the brazing device 610 according to the eighth embodiment includes a wire guide 612 and a holding / moving device 620 that holds the wire guide 612. The wire guide 612 is connected to the wire supply device 618 via the wire guide holding member 622 of the holding / moving device 620. A hollow flexible tube 619 extends from the wire supply device 618. The wire W passes through the flexible tube 619 and protrudes from the tip of the wire guide 612 through the wire supply device 618 and the wire guide 612, respectively.

  The holding / moving device 620 includes a wire guide holding member 622, an arm member 626, an arm holding member 628, and a turning member 630.

  The pivot member 630 is attached to the base 632 so as to be rotatable about a shaft (not shown) arranged in the vertical direction. One end of the arm member 626 is attached to the wire guide holding member 622. The arm member 626 has a driving member 634 at the other end, and the driving member 634 engages with a guide member 636 attached to the arm holding member 628, and in accordance with a control signal from the control device (see an arrow 2601). ) Can slide.

  In the present embodiment, the displacement caused by the reaction force of the wire is detected by the drive member 634 of the arm member 626. FIG. 27 is a diagram for explaining the outline of displacement detection according to the present embodiment. In the present embodiment, the drive member 634 is provided with a position sensor (not shown) such as a linear position sensor, and the position of the drive device 634 can be detected. The driving device 634 is controlled to be held at a desired position against gravity according to a control signal from the control device, and is applied to the guide member 636 according to a temporary force other than gravity. Can slide along the vertical direction.

  A position indicated by a solid line in FIG. 27 is a position where the wire guide 612, the arm member 626, and the driving device 634 are held. When the wire supply device 618 continues to supply the wire while the tip of the wire W is in contact with the upper surface of the base material A (see reference numeral 2700), a reaction force of the wire W is generated, thereby causing the wire guide. 612 is moved upward (see reference numeral 2702). As the wire guide 612 moves upward, the arm member 626 connected to the wire guide 612 also moves in the vertical direction (see arrow 2703). The displacement amount v at this time is detected by a position sensor.

  The processing in the control device in the eighth embodiment is substantially the same as in the sixth embodiment. In the sixth embodiment, the displacement angle an is compared with the predetermined values X, Y, etc. In the eighth embodiment, the vertical displacement amount v is set to another predetermined value X ′. , Y ′, etc.

  According to the eighth embodiment, the control device acquires the reaction force of the wire W as a vertical displacement amount in the drive device 634 of the arm member 626, and the control device acquires the wire W based on the displacement amount. It is possible to determine the contact of the base material with the base metal and the melting of the wire W. Thereby, the feeding and pulling back of the wire W can be appropriately controlled.

  Further, the reaction force of the wire W can be regarded as a stress at the connecting portion of the members of the holding / moving device 520. FIG. 28 is a diagram showing a schematic configuration of a brazing apparatus according to a ninth embodiment of the present invention.

  As shown in FIG. 28, the brazing device 710 according to the ninth embodiment includes a wire guide 712 and a holding / moving device 720 that holds the wire guide 712. The wire guide 712 is connected to the wire supply device 718 via the wire guide holding member 722 of the holding / moving device 720. A hollow flexible tube 719 extends from the wire supply device 718. The wire W passes through the flexible tube 719 and protrudes from the tip of the wire guide 712 through the inside of the wire supply device 718 and the wire guide 712, respectively.

  The holding / moving device 720 includes a wire guide holding member 722, an arm member 726, an arm holding member 728, and a turning member 730.

  The swivel member 730 is attached to the base 732 so as to be rotatable about a shaft (not shown) arranged in the vertical direction. One end of the arm member 726 is attached to the wire guide holding member 722. The arm member 726 is attached to the arm holding member 728 via the connecting member 734 at the other end. In the present embodiment, a stress detection member 736 such as a strain gauge is disposed in the arm holding member 728 in the vicinity of the position in contact with the connecting member 734. The position where the stress detection member 736 is disposed is not limited to this, and a position where the force generated at one end of the arm member 726 can be detected as stress, for example, a contact position between the arm member 726 and the connecting member 734 (reference numeral 2801). ), The stress detecting member 736 may be disposed at a contact position (reference numeral 2802) between the arm holding member 728 and the pivot member 730, a contact position between the pivot member 730 and the base 732 (reference numeral 2803), or the like.

  In the ninth embodiment, when the wire supply device 718 continues to supply the wire while the tip of the wire W remains in contact with the upper surface of the base material A (see reference numeral 2700), the reaction force of the wire W is increased. This causes the wire guide 712 to move upward. However, in the ninth embodiment, the wire guide 712 is fixed to the arm member 726, and the arm member 726 is fixed to the arm holding member 728 via the connecting member 734. Therefore, distortion occurs according to the magnitude of the reaction force. In the ninth embodiment, the stress detection member 736 detects the strain and determines the contact of the wire W with the base material and the melting of the wire W based on the value of the strain. The processing in the control device in the eighth embodiment is substantially the same as in the sixth embodiment. In the sixth embodiment, the displacement angle an is compared with the predetermined values X, Y, etc. In the eighth embodiment, the value st indicating the distortion is changed to another predetermined value X ″, Compare with Y ”etc.

  In the ninth embodiment, the holding / moving device 720 includes a wire guide holding member 722, an arm member 726, an arm holding member 728, and a turning member 730 (FIG. 28). However, the holding / moving device is not limited to the above-described configuration. For example, as described in the sixth embodiment, the wire guide holding member 522, the distal end portion 524, the upper arm 526, the lower arm 528, and the turning member The configuration may include 530 (see FIG. 20). Also in this case, the stress detection member may be disposed at a position where the force generated at one end of the arm member 526 shown in FIG. 20 can be detected as stress.

DESCRIPTION OF SYMBOLS 10 Brazing apparatus 12 Wire guide 14 Wire guide front-end | tip part 16 Wire guide rear part 18 Wire supply apparatus 20 Wire supply member 22 Heater 24 Heater front-end | tip M1 1st base material M2 2nd base material W Wire F Flame 25 Base 26 End wall 30 Movable member 32 Rotating shaft 31 Movable member support portion 33 Wire supply device support base 35 Stopper 36 Drive roller 37 Driven roller

Claims (16)

A welding device that integrates a plurality of base materials with a melted filler material at a welding position,
A heating member for heating the wire of the base material and the filler material at the welding position;
A hollow wire guide that guides the welding position through the wire of the filler material;
A wire supply member that feeds the wire of the filler material to the welding position or pulls it back from the welding position;
A displacement measuring means for measuring a displacement in a predetermined member caused by a reaction force with respect to the feeding due to bending of the wire fed to the welding position by the wire supply member;
A welding apparatus comprising: control means for controlling feeding and withdrawal of the wire of the filler metal by the wire supply member based on the change in displacement by the displacement measuring means. The displacement measuring means has a movable member that rotatably supports the wire supply member,
The movable member is
A rotating shaft including a biasing member that biases the wire supply member in a predetermined direction;
A stopper for restricting rotation of the wire supply member in the predetermined direction at a predetermined position;
Rotation angle acquisition means for acquiring the rotation angle of the rotation shaft as a displacement,
The reaction force causes the wire supply member to rotate in a direction opposite to the predetermined direction against the bias, and the rotation angle acquisition unit acquires a rotation angle of a rotary shaft that rotates together with the wire supply unit. The welding apparatus according to claim 1, wherein: The displacement measuring means has a movable member that slidably supports the wire supply member,
The movable member is
A guide member for guiding the slide of the wire supply member;
A biasing member that biases the wire supply member in a predetermined direction;
A stopper for restricting sliding of the wire supply member in the predetermined direction at a predetermined position;
Distance acquisition means for acquiring a movement distance from the predetermined position of the wire supply member as a displacement;
The reaction force causes the wire supply member to slide in a direction opposite to the predetermined direction against the biasing by the biasing member, and the distance acquisition means moves the wire supply member from the predetermined distance. The welding apparatus according to claim 1, wherein a distance is acquired. The wire guide has an elastically deformable portion;
The displacement measuring means has a movable member that rotatably supports one end of the elastically deformable portion,
A rotating shaft including a biasing member that biases the elastically deformable portion in a predetermined direction;
A stopper for restricting rotation of the elastically deformable member in the predetermined direction at a predetermined position;
Rotation angle acquisition means for acquiring the rotation angle of the rotation shaft as a displacement,
Due to the reaction force, the elastically deformable portion rotates in a direction opposite to the predetermined direction against the bias, and the rotation angle acquisition means acquires a rotation angle of the rotation shaft. The welding apparatus according to claim 1. A movable member connected to an arm extending from the wire guide and holding the wire guide swingably about a rotation axis;
A biasing member that biases the arm and the rotating shaft in a predetermined direction;
A stopper for restricting rotation of the arm and the rotation shaft in the predetermined direction at a predetermined position;
Rotation angle acquisition means for acquiring the rotation angle of the rotation shaft as a displacement,
The reaction force causes the wire guide, the arm, and the rotation shaft to rotate in a direction opposite to the predetermined direction against the bias, and the rotation angle acquisition unit acquires the rotation angle of the rotation shaft. The welding apparatus according to claim 1. A movable member connected to an arm extending from the wire guide and having a sleeve member that slides the wire guide in parallel with a direction in which the wire extends; the sleeve member is urged toward the distal end of the wire;
A stopper for restricting sliding of the arm and the sleeve member toward the distal end of the wire at a predetermined position;
A movement distance acquisition means for acquiring a movement distance of the sleeve in the extending direction of the wire as a displacement;
The reaction force causes the wire guide, arm, and sleeve member to slide in a direction opposite to the tip direction of the wire against the bias, and the movement distance acquisition unit acquires the movement distance of the sleeve member. The welding apparatus according to claim 1. It has a wire guide holding and moving member that holds the wire guide and moves,
The wire guide holding / moving member has an arm member and a rotation shaft for rotating the arm member,
The displacement measuring means has a rotation angle acquisition means for acquiring a rotation angle of the rotation shaft of the wire guide holding / moving member as a displacement,
Due to the reaction force, the arm member of the wire guide holding / moving member rotates in a certain direction, and the rotation angle acquisition means acquires the rotation angle of the rotating shaft accompanying the rotation of the arm member. The welding apparatus according to claim 1, wherein It has a wire guide holding and moving member that holds the wire guide and moves,
The wire guide holding / moving member includes an arm member and a rotation shaft that rotates the arm member, and an arm member driving unit that is connected to the rotation shaft and rotates the arm member.
The displacement measuring means has a torque acquisition means for acquiring the torque in the arm member driving means as a displacement;
Due to the reaction force, a load is applied to the arm member of the wire guide holding / moving member in a certain direction, and the torque acquisition means acquires the torque as the load on the arm member increases. The welding apparatus according to claim 1. It has a wire guide holding and moving member that holds the wire guide and moves,
The wire guide holding / moving member includes an arm member that holds the wire guide, and a driving unit that holds the horizontal position of the arm member and slides the arm member in a vertical direction;
The displacement measuring means has a slide amount acquisition means for acquiring a slide amount in the vertical direction of the arm member as a displacement;
The arm member of the wire guide holding / moving member slides in one direction in the vertical direction by the reaction force, and the slide amount acquisition unit acquires a slide amount by the slide of the arm member. The welding apparatus according to claim 1. It has a wire guide holding and moving member that holds the wire guide and moves,
The wire guide holding / moving member has an arm member that holds the wire guide, and an arm holding member that holds the arm member,
The displacement measuring means includes a stress detecting means for detecting a stress in the arm member or the arm holding member as a displacement;
2. The stress is generated in the arm member and the arm holding member of the wire guide holding / moving member by the reaction force, and the stress means acquires the stress in the arm member or the arm holding member. The welding apparatus as described in.   After the displacement increases and reaches the first predetermined value, the control means has a total supply amount, which is an accumulated amount of the supply amount of the wire supplied by the wire supply means, larger than a predetermined amount, and When the displacement decreases and becomes equal to or less than a second value smaller than the first value, it is determined that the welding at the welding position is finished, and the wire supply member pulls back the wire by a predetermined amount. The welding apparatus according to claim 1, wherein the welding apparatus is configured as follows.   After the displacement increases and reaches the first predetermined value, the control means decreases the displacement when the total supply amount of the wires supplied by the wire supply means is equal to or less than a predetermined value, and “0 The welding apparatus according to claim 11, wherein once the wire is pulled back by a predetermined amount by the wire supply member, the wire is again fed by the wire supply member.   The said control means is comprised so that the supply of the wire by the said wire supply member may be stopped after the said displacement increases and it reaches the said 1st predetermined value. Welding equipment. After the displacement increases and reaches the first predetermined value, the control means reduces the displacement again when the total supply amount of the wire supplied by the wire supply means is less than or equal to a predetermined value, When the value is equal to or smaller than a third predetermined value smaller than the first predetermined value,
Until the total wire supply amount exceeds the predetermined value, the wire is fed by the wire supply member,
When the total wire supply amount is less than or equal to the predetermined amount, the displacement increases and reaches a fourth predetermined value between the first predetermined value and a third predetermined value. Decelerate or stop the wire supply means,
Until the total wire supply amount exceeds the predetermined value, the wire is fed by the wire supply member,
When the total wire supply amount exceeds the predetermined value, it is determined that the welding at the welding position is completed, and the wire supply member pulls back the wire by a predetermined amount. The welding apparatus according to claim 13.   15. The welding apparatus according to claim 11, wherein the control unit calculates a supply amount of the wire by the wire supply member based on a rotation amount of a roller provided in the wire supply member.   The welding apparatus according to claim 11, wherein the control unit calculates a supply amount of the wire by the wire supply member based on the displacement.

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