JP2019202334A - Spot welding machine - Google Patents

Abstract

To provide a spot welding machine which can perform welding with respect to the inner side than a peripheral part, that is, the inner wall side of an object to be welded through the peripheral part, even for the object to be welded having the peripheral part surrounding an opening part.SOLUTION: A spot welding machine includes a laminate 9 for conducting electricity which is vertically arranged on a table for placing an object to be welded and is composed of an insulation plate, a lateral surface conductive plate and a lateral surface rear conductive plate, a pressing electricity conducting arm 50 which connects first and second arm pieces 50A, 50B slidably to each other in a horizontal direction, is provided with an extending part 50A3 on one side of each other end part, is provided with an extending part 50B3 on the other side, at the same time, is provided with a welded chip 54A on the extending part 50A3 and is provided with a welded chip 54B on the extending part 50B3, a cylinder 52 which moves a first arm piece, a cylinder 53 which moves a second arm piece, first and second switches 57A, 57B and a control part 600 which controls the cylinders 52, 53 by detecting operations of the first and second switches 57A, 57B. Therein, the pressing electricity conducting arm 50 is freely rotatably hung in the horizontal direction.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a spot welder that sandwiches a plate assembly (hereinafter referred to as “a workpiece to be welded”) formed by superposing at least two steel plates between two electrodes, and energizes and welds them while applying pressure.

  As the above-described spot welder, there is one previously proposed by the present inventors (Patent Document 1). FIG. 9 is a diagram showing a schematic configuration of the spot welder previously proposed by the inventors of the present application. In the figure, a spot welder 100 is arranged upright on a rectangular plate-like table 30 on which the work W is placed and one end in the longitudinal direction of the table 30, and includes an insulating plate 14 and an insulating plate 14. A current-carrying laminate 9 comprising a side conductive plate 5 disposed in close contact with one surface side and a side rear conductive plate 7 disposed in close contact with the other surface is suspended from above the table 30. And a pressurizing energizing arm 4. The work piece W is rectangular and has a box shape with one surface (upper surface) opened, and the energization laminate 9 is in the longitudinal direction of the work piece W (the direction from the front side to the back side). It has a rectangular shape with approximately the same length.

  The pressurizing energizing arm 4 includes two arm pieces 8A and 8B, a flexible power supply member (not shown), a cylinder 12, and two welding tips 11. Each of the arm pieces 8A and 8B is formed in a substantially L shape. One end of each of the arm pieces 8A and 8B is rotatably connected via a rotation shaft (not shown). The arm pieces 8A and 8B are connected to each other via a conductive power supply member (not shown). The cylinder 12 is fixed to the arm piece 8A side, and the piston rod is connected to the arm piece 8B. Due to the movement of the piston rod of the cylinder 12, the arm piece 8B rotates around the above-described rotation axis. That is, the piston rod rotates in the opening direction when it extends, and rotates in the closing direction when it contracts. In addition, since the arm piece 8B rotates around the rotation axis, the trajectory has an arc shape.

  One of the two welding tips 11 is attached to the distal end portion of the arm piece 8A, and the other is attached to the distal end portion of the arm piece 8B. The two welding tips 11 are arranged in directions facing each other. The welding tip 11 is also called “tip electrode” or “electrode tip”.

  The pressurizing energizing arm 4 is used in a state of being hung on the ceiling 2 or the like by a rod-like hanger 10. The connecting portion between the pressurizing energizing arm 4 and the lifting tool 10 is provided with the above-described rotating shaft, and the pressurizing energizing arm 4 is rotatable about the rotating shaft. The lifting tool 10 is composed of an air cylinder, a spring balancer, and the like (not shown), and the pressurizing and energizing arm 4 can be moved up and down. A linear motion guide 15 for moving the pressurizing energizing arm 4 along the work piece W is installed on the ceiling 2. The linear motion guide 15 is composed of a rail-like fixed portion (not shown) and a movable piece (not shown) that slides on the fixed portion, and a base end portion of the lifting tool 10 is connected to the movable piece. ing.

  A welding transformer 16 is provided below the table 30. One electrode of the welding transformer 16 is connected to the side conductive plate 5 of the energization laminate 9 via the connection copper plate 17, and the other electrode is connected to the side rear conductive plate of the energization laminate 9 via the connection copper plate 18. 7 is connected. Placement of the workpiece W on the table 30 is performed in a state where the side surface where the welded portion of the workpiece W is welded is in contact with the side surface rear conductive plate 7 of the energization laminate 9. After the workpiece W is placed on the table 30, the pressurized energizing arm 4 is lowered to the workpiece W. Thereafter, the workpiece W is clamped together with the energization laminate 9, and pressurization / energization is performed. Thereby, welding for one spot is completed. Thereafter, welding is performed on other welding locations by the same operation.

JP 2012-250253 A (Patent No. 5610303)

  However, in the conventional spot welder 100 described above, there is a problem that a portion that cannot be welded is generated depending on the shape of the workpiece W. For example, when welding is performed on the workpiece W having an opening on one side within the workpiece W through the opening, there is no problem if the entire opening is open. Is partially open, the pressure energizing arm 4 hits the tip of the peripheral edge surrounding the opening, and welding cannot be performed on the inner side of the peripheral edge. This problem will be described in more detail with reference to FIGS. FIG. 10 is a view of the spot welder 100 shown in FIG. 9 as viewed from directly above. 11 is a cross-sectional view taken along line AA in FIG. In addition, in FIG. 10, the pressurization energization arm 4 has shown only the front-end | tip part schematically.

  As shown in FIGS. 10 and 11, when one surface is open and there is a peripheral edge Wr surrounding the opening Wo, and welding is performed inside the work W through the opening Wo, the inner side from the peripheral edge Wr. If it is going to carry the pressurization energizing arm 4 on the inner wall side of the workpiece W (that is, the inner side of the workpiece W), it will hit the tip of the peripheral edge Wr, and welding cannot be performed at the portion Wa inside the peripheral edge Wr. In addition, even if it is the opening part which is vacant on the whole surface, since the pressurization energization arm 4 is thick, the pressurization energization arm 4 can only be brought about a half of the distance.

  Further, since the conventional spot welder 100 described above rotates the arm piece 8B about the rotation axis, the cylinder 12 can be brought above the rotation axis. By doing in this way, the dimension of arm piece 8A, 8B can be taken long, and it can respond also to a to-be-welded thing with a big pocket. However, since the arm piece 8B pressurizes the work piece in a direction in which the arm piece 8B rotates in an arc shape, the pressure apex may be shifted by polishing the two welding tips 11 (referred to as "electrode dressing"). May occur, and welding may not be performed normally. In addition, there is a drawback that it is difficult to aim at the welding point because the arm piece 8B rotates in an arc shape.

  This invention is made | formed in view of the situation which concerns, and it welds with respect to the inner wall side of a to-be-welded object through this peripheral part, even if it has a peripheral part surrounding an opening part through this peripheral part. An object of the present invention is to provide a spot welder capable of performing the above.

  The spot welder of the present invention includes a table for placing an object to be welded, an upright arrangement on the table, an insulating plate, a side conductive plate arranged in close contact with one surface of the insulating plate, and the other surface Each of the first and second arm pieces formed in a substantially U-shape and symmetrically arranged opposite to each other, the first and second arm pieces being formed in a substantially U shape. One end portions of the second arm pieces are slidably connected to each other in the horizontal direction, and the other end portions extend in a direction perpendicular to the horizontal direction with respect to the opposing direction of the first and second arm pieces. A pressurizing energizing arm provided with an extending portion and a welding tip provided in each extending portion in the same direction as the opposing direction of the first and second arm pieces, and the pressurizing energizing arm vertically Can move up and down in the direction and can rotate in the horizontal direction A suspending tool for lowering, a linear motion guide for moving the pressurizing energizing arm in the horizontal direction together with the hoisting tool, and the first arm piece of the pressurizing energizing arm with respect to the second arm piece. A first drive unit that moves in a direction away from the approaching direction, and a second drive unit that moves the second arm piece of the pressure energization arm in a direction away from the direction approaching the first arm piece. By detecting the operation of the drive unit, the first switch for operating the first drive unit, the second switch for operating the second drive unit, and the operation of the first switch The second driving unit controls the first driving unit so as to obtain a pressing force necessary for welding, and detects the operation of the second switch to obtain the pressing force necessary for welding. A control unit that controls the drive unit.

  According to the above-described configuration, the extending portion for allowing the pressurizing energizing arm to rotate in the horizontal direction and disposing the welding tip at the other end of each of the first and second arm pieces constituting the pressurizing energizing arm. Since it is provided, when welding is performed on the inside of the workpiece having a peripheral edge surrounding the opening, the welding tip may be taken from the peripheral edge surrounding the opening to the inner wall side. And welding can be performed on the inner wall side.

  In addition, since the first and second arm pieces slide in a direction perpendicular to the longitudinal direction, the movement trajectory becomes a straight line, so that the first and second arm pieces are provided at the tip portions of the first and second arm pieces. Even if the welding tip is polished, there is no displacement of the apex of pressure, and normal welding can always be performed. Moreover, since it is easy to aim at a welding point, operativity can be improved.

  In the above configuration, a first handle provided on one surface side of the pressurization energizing arm main body in the same direction as the extending direction of the extending portion of the first arm piece, and the first switch is disposed. The second arm piece is provided on the surface opposite to the one surface side of the pressurizing energizing arm main body in the same direction as the extending direction of the extending portion of the second arm piece, and the second switch is disposed. And a marking member for associating each of the first arm piece, the first switch, and the second arm piece with the second switch.

  According to the above configuration, since the correspondence relationship between the first and second switches and the first and second arm pieces can be easily grasped even when the pressure energizing arm is rotated in the horizontal direction, A welding tip can be correctly applied to each conductive plate.

  According to the present invention, even a workpiece having a peripheral portion surrounding the opening can be welded through the peripheral portion to the inside, that is, the inner wall side of the workpiece.

The perspective view which shows schematic structure of the spot welder which concerns on one Embodiment of this invention. FIG. 1 is a front view showing a pressurizing energizing arm of the spot welder of FIG. The side view which shows the pressurization energization arm of FIG. AA line arrow figure of pressurization energization arm of Drawing 2 FIG. 1 is a block diagram showing a schematic configuration of a welding control device of the spot welder of FIG. 1 and a connection state between the welding control device and peripheral devices. The figure for demonstrating the operation | movement at the time of welding of the pressurization energization arm of FIG. The figure for demonstrating the operation | movement at the time of welding of the pressurization energization arm of FIG. The figure for demonstrating the operation | movement at the time of welding of the pressurization energization arm of FIG. The figure which shows schematic structure of the conventional spot welder The figure for demonstrating the problem of the conventional spot welder of FIG. The figure for demonstrating the problem of the conventional spot welder of FIG.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments for carrying out the invention will be described in detail with reference to the drawings.

  FIG. 1 is a perspective view showing a schematic configuration of a spot welder 1 according to an embodiment of the present invention. In the figure, the same reference numerals are given to the portions common to FIG. 9 described above. 2 is a front view showing the pressurizing energizing arm 50 of the spot welding machine 1 of FIG. 1, FIG. 3 is a side view of the pressurizing energizing arm 50, and FIG. 4 is an AA line of the pressurizing energizing arm 50 of FIG. An arrow figure and FIG. 5 are block diagrams which show the schematic structure of the welding control apparatus 60 of the spot welder 1, and the connection state of the welding control apparatus 60 and peripheral devices.

  As shown in FIGS. 1 and 5, the spot welder 1 includes a rectangular plate-like table 30 on which the workpiece W is placed, and one end in the longitudinal direction of the table 30 (an end on the front side of the drawing). Side insulating plate 14, side conductive plate 5 disposed in close contact with one surface of insulating plate 14, and side rear conductive plate disposed in close contact with the other surface of insulating plate 14. 7, an energizing laminate 9, a pressurizing energizing arm 50 suspended from above the table 30, a welding control device 60, an operation panel 61, and a power supply unit 62.

  In FIG. 1, a work piece W has a rectangular shape and a box shape in which one surface (hereinafter referred to as an “upper surface”) is open, and the current-carrying laminate 9 has a length in the longitudinal direction of the work piece W. It has a rectangular shape with approximately the same length.

  2-4, the pressurizing energizing arm 50 is flexible so that the two arm pieces (first and second arm pieces) 50A and 50B arranged opposite to each other and the arm pieces 50A and 50B are electrically connected to each other. The power supply member 51, the cylinder (first driving unit) 52 that slides the arm piece 50A in a direction perpendicular to the longitudinal direction, and the cylinder (first drive) that slides the arm piece 50B in a direction perpendicular to the longitudinal direction. 2 driving portion) 53, a welding tip 54A attached to the tip of the arm piece 50A, a welding tip 54B attached to the tip of the arm piece 50B, and a U-shaped support member that supports the cylinders 52 and 53. 55, a handle (first handle) 56A disposed on one surface side of the support member 55 in a direction perpendicular to the opposing direction of the arm pieces 50A and 50B, and the arm piece 5 A handle 56B (second handle, see FIG. 3) disposed on the other surface side (the surface opposite to the one surface) of the support member 55 in a direction perpendicular to the facing direction of A and 50B. A switch 57A (first switch) disposed on the handle 56A and a switch 57B (second switch) disposed on the handle 56B are provided.

  In the arm piece 50A, one end portion 50A1 is bent at a right angle, the other end portion 50A2 is bent at a right angle in the same direction as the one end portion 50A1, and the previous portion (hereinafter referred to as an “extension portion”) 50A3. Is bent in a right angle direction (turned 90 degrees toward the front of the drawing). A welding tip 54A is disposed on the extending portion 50A3 of the arm piece 50A. A cylindrical hole 50AS extending in the axial direction is formed at one end 50A1 of the arm piece 50A. An extending portion 50A3 extending to the other end 50A2 of the arm piece 50A extends in the same direction as the attachment direction of the handle 56A.

  Similarly to the arm piece 50A, the arm piece 50B has one end portion 50B1 bent at a right angle and the other end portion 50B2 bent at a right angle in the same direction as the one end portion 50B1. 50B3 is further bent in a perpendicular direction (90 ° bent toward the front side of the drawing). A welding tip 54B is disposed on the extending portion 50B3 of the arm piece 50B. A cylindrical protrusion 50BP that protrudes in the axial direction is formed at one end 50B1 of the arm piece 50B. This columnar protrusion 50BP can be inserted into a cylindrical hole 50AS formed in one end 50A1 of the arm piece 50A. An extending portion 50B3 extending to the other end 50B2 of the arm piece 50B extends in the same direction as the attachment direction of the handle 56B.

  The cylinders 52 and 53 are attached to the support member 55 so as to face each other. The piston rod 52A of the cylinder 52 is coupled to the arm piece 50A, and the piston rod 53A of the cylinder 53 is coupled to the arm piece 50B. The cylinders 52 and 53 are, for example, air cylinders, and the piston rods 52A and 53A contract when the air is supplied, and the piston rods 52A and 53A extend when the air is released. The piston rods 52A and 53A of the cylinders 52 and 53 are fully extended in the default state where the air is completely discharged, and contract when the air is supplied.

  As air is supplied to the cylinder 52 and the piston rod 52A contracts, the arm piece 50A moves in a direction approaching the arm piece 50B. As air is released from the cylinder 52 and the piston rod 52A extends, the arm piece 50A Move away from 50B. Similarly, as the cylinder 53 is supplied with air and the piston rod 53A contracts, the arm piece 50B moves in a direction approaching the arm piece 50A. The air is released from the cylinder 53 and the arm 50B extends as the piston rod 53A extends. It moves in a direction away from the arm piece 50A.

  In FIG. 5, the welding control device 60 includes a control unit 600 and a drive unit 601. An operation panel 61 for setting “current value”, “energization time”, “pressurizing force” and the like is connected to the welding control device 60, and the control unit 600 controls the above various set values. Is set, a command signal is generated based on the set various set values, and is output to the power supply unit 62. The power supply unit 62 incorporates an inverter circuit and the like in addition to the welding transformer 16.

  Further, the control unit 600 controls the cylinders 52 and 53 by detecting the operation of the switches 57A and 57B disposed on the pressurizing energizing arm 50. In this case, since the cylinders 52 and 53 are driven by the drive unit 601, the control unit 600 outputs a control signal to the drive unit 601 when the cylinders 52 and 53 are controlled. The controller 600 detects the operation of the switch 57A disposed on the handle 56A, so that the cylinder 52 is continuously applied with a constant pressure from immediately before the energization to a predetermined time after the energization ends. The air is continuously supplied so that the air is obtained, and after a predetermined time has elapsed, the air is discharged. In addition, the control unit 600 detects the operation of the switch 57B disposed on the handle 56B, so that the cylinder 53 continues to be constant for a certain period of time after the end of energization until just after the energization ends. Air is continuously supplied so as to obtain a pressurizing force, and after a predetermined time has elapsed, control is performed to release the air.

  When welding is performed on the workpiece W side, the pressurizing energizing arm 50 is applied to the workpiece W. At this time, first, one of the arm pieces 50 </ b> A and 50 </ b> B is applied to the welded portion of the work W and then the other is applied to the side conductive plate 5 of the energization laminate 9. Here, although it is necessary to apply the pressurization energization arm 50 correctly to the welding location of the workpiece W, the cylinder that moves the arm piece of the pair of arm pieces of the pressurization energization arm 50 that contacts the welding location. The cylinder that moves the arm piece that is not applied to the welded portion, that is, the side that is applied to the side conductive plate 5, is operated. For example, when the arm piece 50B is applied to the welding location, the cylinder 52 that moves the arm piece 50A is operated. The reason is that the arm piece that is not applied to the welded portion does not require accuracy with respect to the applied position, and therefore there is no problem even if the position shift occurs due to movement. Of course, when the range of a welding location is wide, for example, you may make it move the direction applied to a welding location.

  By operating the cylinder 52, the arm piece 50A moves in a direction approaching the arm piece 50B. As the arm piece 50A moves, the welding tip 54A disposed in the extending portion 50A3 at the tip of the arm piece 50A hits the side surface conductive plate 5 of the energizing laminate 9. The arm piece 50 </ b> A further moves to pressurize the defendant weld W. Similarly, by operating the cylinder 53, the arm piece 50B moves in a direction approaching the arm piece 50A. As the arm piece 50B moves, the welding tip 54B disposed in the extending portion 50B3 at the tip end portion of the arm piece 50B hits the side surface conductive plate 5 of the energization laminate 9. The arm piece 50B is further moved, so that pressure is applied to the defendant weld W. Thus, the cylinder 52 operates when pressurizing the defendant weld W on the arm piece 50A side, and the cylinder 53 operates when pressurizing the defendant weld W on the arm piece 50B side.

  FIG. 6 is a diagram illustrating an operation during welding of the pressurizing energizing arm 50. As shown to (a) of the figure, when welding the to-be-welded object W2 to the to-be-welded object W2, when a to-be-welded object W2 is welded to the inner side surface Ws of the to-be-welded object W, an operator visually confirms the welding location. The welding tip 54B on the side of the arm piece 50B is applied to the welding location. Next, in this state, the switch 57A disposed on the handle 56A is operated. As a result, air is supplied to the cylinder 52 on the arm piece 50A side, the arm piece 50A moves in the direction of arrow B, the welding tip 54A hits the side surface conductive plate 5 of the energization laminate 9, and the work piece W and the object to be welded. Pressurize the welding location of the weldment W2. When the welding tip 54A hits the side conductive plate 5 of the energization laminate 9, the connection copper plate 17 (see FIG. 1) from one electrode of the welding transformer 16 → the side conductive plate 5 of the energization laminate 9 → the pressurization energization arm 50 welding tips 54A → feeding member 51 of the pressurizing energizing arm 50 → welding tip 54B of the pressurizing energizing arm 50 → workpiece W2 → workpiece W → side rear conductive plate 7 of the laminate 9 for energization → connection copper plate 18 (see FIG. 1) → Current flows through the path of the other electrode of the welding transformer 16, and spot welding is performed. When the welding for one spot is completed, the air is extracted from the cylinder 52, the arm piece 50A moves in the direction of the arrow B ′, as shown in FIG. Go away from the side conductive plate 5.

  Since the spot welding machine 1 has the extending portion 50A3 at the tip portion of the arm piece 50A of the pressurizing energizing arm 50 and the extending portion 50B3 at the tip portion of the arm piece 50B, the workpiece W Even if it comprises the structure which has the opening part Wo and the peripheral part Wr surrounding this opening part Wo, it takes welding tip 54A, 54B inside the peripheral part Wr (namely, inner wall side of the to-be-welded object W). be able to. Here, FIG. 7 is a diagram illustrating an example of a welding position of the workpiece W. In addition, in the same figure, only the front-end | tip part has shown schematically the pressurization electricity supply arm 50. FIG. FIG. 8 is a diagram showing a difference in orientation of the pressurizing energizing arm 50 at the welding positions P1 and P5 in FIG. 7 and 8, the spot welder 1 has the extending portions 50A3 and 50B3 as well as the positions P2 to P4 where the pressurizing energizing arm 50 does not hit the tip of the peripheral edge Wr. The welding can also be performed at a position P1 (left end position as viewed in the drawing) and a position P5 (right end position as viewed in the drawing) corresponding to the tip of the peripheral edge Wr. However, since the extending portions 50A3 and 50B3 are provided, it is necessary to reverse the pressurization energizing arm 50 by 180 degrees at the position P5.

  Since the positional relationship between the arm pieces 50A and 50B is reversed by reversing the pressure energizing arm 50 by 180 degrees, it is necessary to pay attention. That is, at position P1 to position P4, the arm piece 50B is located on the welding location side of the workpiece W and the arm piece 50A is located on the side conductive plate 5 side of the energization laminate 9, but at position P5 Since the piece 50B is positioned on the side conductive plate 5 side of the current-carrying laminate 9 and the arm piece 50A is positioned on the welding location side of the workpiece W, the operation of the switches 57A and 57B is reversed. is there. At positions P1 to P4, the switch operation at the time of welding is the switch 57A of the handle 56A, but at the position P5, it is the switch 57B of the handle 56B. As described above, in order to move one of the arm pieces 50A and 50B that is not applied to the welded portion, when the pressurization energizing arm 50 is inverted 180 degrees, the switch on the opposite side to the previous one is operated. . That is, if the switch 57A is operated before the pressurization energizing arm 50 is reversed, if the pressurization energizing arm 50 is inverted 180 degrees, the switch 57B is operated.

  Since the operation of the switches 57A and 57B is reversed every time the pressurized energizing arm 50 is inverted 180 degrees, the relationship between the switch 57A on the handle 56A side and the welding tip 54A on the arm piece 50A side and the switch on the handle 56B side It is desirable to clarify the relationship between 57B and the welding tip 54B on the arm piece 50B side. In particular, the orientation of the handles 56A and 56B provided on the pressurizing energizing arm 50 is the same as the orientation of the extending portions 50A3 and 50B3 provided on the tip of the pressurizing energizing arm 50. Can eliminate operational mistakes. In this embodiment, marking is performed so that these relationships can be easily grasped.

  As shown in FIG. 3, in order to show that the switch 57B and the welding tip 54B are in a corresponding relationship, the seal (marking member) 70B having the same content (“Bs”) is pasted on both the handle 56B and the extended portion 50B3. ing. Further, as shown in FIGS. 3 and 4, in order to show that the switch 57A and the welding tip 54A are in a corresponding relationship, both the handle 56A and the extended portion 50A3 have the same content (“As”). Member) 70A is stuck. In this way, by marking so that the correspondence between the switches 57A and 57B and the welding tips 54A and 54B can be understood, the operator can connect the switch 57A disposed on the handle 56A to the welding tip 54A on the arm piece 50A side. Therefore, it can be easily grasped that the switch 57B disposed on the handle 56B corresponds to the welding tip 54B on the arm piece 50B side, and the operation can be performed without invading the operation mistake. In addition to the seals 70A and 70B, for example, a light bulb or an LED (light emitting diode) can be used as the marking member so that the correspondence can be grasped by the difference in emission color.

  Note that the spot welder 1 according to the present embodiment is used in a state in which the pressurizing energizing arm 50 is suspended from the ceiling 2 or the like by the rod-shaped lifting tool 10 in the same manner as the conventional spot welder 100 shown in FIG. A rotating shaft capable of rotating the pressurization energization arm 50 in the horizontal direction is provided at a connection portion between the pressurization energization arm 50 and the hanging tool 10. The lifting tool 10 is composed of an air cylinder, a spring balancer, and the like (not shown), and the pressurizing energizing arm 50 can be moved up and down. On the ceiling 2, a linear motion guide 15 for moving the pressurized energizing arm 50 along the workpiece W is installed. The linear motion guide 15 includes a rail-shaped fixed portion 15A and a movable piece 15B that slides on the fixed portion 15A, and the base end portion of the hanger 10 is connected to the movable piece 15B.

  A power supply unit 62 including a welding transformer 16 is provided below the table 30. One electrode of the welding transformer 16 is connected to the side conductive plate 5 of the energization laminate 9 via the connection copper plate 17, and the other electrode is connected to the side rear conductive plate of the energization laminate 9 via the connection copper plate 18. 7 is connected. Placement of the workpiece W on the table 30 is performed in a state where the side surface where the welded portion of the workpiece W is welded is in contact with the side surface rear conductive plate 7 of the energization laminate 9. After the workpiece W is placed on the table 30, the pressurized energizing arm 4 is lowered to the workpiece W. Thereafter, the workpiece W is clamped together with the energization laminate 9, and pressurization / energization is performed. Thereby, welding for one spot is completed. Thereafter, welding is performed on other welding locations by the same operation.

  Thus, according to the spot welding machine 1 which concerns on this embodiment, it has the arm pieces 50A and 50B which are each formed in substantially U shape, and are opposingly arrange | positioned left-right symmetrically, One end part of each of the arm pieces 50A and 50B Are connected to each other so as to be slidable in the horizontal direction, and extending portions 50A3 and 50B3 extending in a direction perpendicular to the horizontal direction with respect to the opposing direction of the arm pieces 50A and 50B are provided at the other end portions. 50A3 and 50B3 are provided with welding tips 54A and 54B in the same direction as the facing direction of the arm pieces 50A and 50B, and further on one surface of the pressurizing arm main body in the same direction as the extending direction of the extending part 50A3 of the arm piece 50A. The handle 56A is disposed on the side, and the handle 5 is provided on the surface opposite to the one surface side of the pressurizing arm main body in the same direction as the extending direction of the extending portion 50B3 of the arm piece 50B. A pressure energizing arm 50 provided with B, a cylinder 52 for moving the arm piece 50A of the pressure energizing arm 50 in a direction away from the arm piece 50B, and a second arm of the pressure energizing arm. A cylinder 53 that moves the piece 50B in a direction toward and away from the first arm piece 50A, a handle 56A, a switch 57A for operating the cylinder 52, and a handle 56B. By detecting the switch 57B for operating the cylinder 53 and the operation of the switch 57A, the cylinder 52 is controlled so that the pressurizing force necessary for welding is obtained, and the operation of the switch 57B is detected. And a control unit 600 that controls the cylinder 53 so as to obtain the required pressure force, so that the workpiece to be welded has a peripheral edge Wr surrounding the opening Wo. On the other hand, when welding is performed inside through the opening Wo, the welding tips 54A and 54B can be brought from the peripheral edge Wr surrounding the opening Wo to the inner wall portion Wa, and welding is performed at the portion Wa. Can do.

  Further, since the first and second arm pieces 50A and 50B are slid in the horizontal direction, the respective movement trajectories are straight lines, and therefore the tip portions of the first and second arm pieces 50A and 50B, respectively. Even if the welding tips 54A and 54B provided on the surface are polished, there is no displacement of the pressure apex, and normal welding can always be performed. Moreover, since it is easy to aim at a welding point, operativity can be improved.

  In addition, since the marking members 70A and 70B are provided for associating the arm piece 50A with the switch 57A and the arm piece 50B and the switch 57B, the switches 57A and 57B and the arm piece 50A even when the pressurizing energizing arm 50 is rotated in the horizontal direction. , 50B can be easily grasped, so that the welding tip can be correctly applied to the workpiece W and the side conductive plate 5 respectively.

  The present invention has an effect that even a work piece having a peripheral part surrounding an opening can be welded through the peripheral part to the inside, that is, the inner wall side of the work piece. Applicable to welding machines.

DESCRIPTION OF SYMBOLS 1 Spot welding machine 2 Ceiling 5 Side surface conductive plate 7 Side surface rear conductive plate 9 Laminate for electricity supply 10 Lifting tool 15 Linear motion guide 15A Fixed part 15B Movable piece 14 Insulating plate 30 Table 50 Pressurization energization arm 50A, 50B Arm piece 50A1 Arm One end portion 50B1 One end portion 50B1 of the arm piece 50B 50A2 The other end portion 50B2 of the arm piece 50A The other end portion 50A3 of the arm piece 50B 50B3 The extension portion of the arm piece 50A 50B3 The extension portion of the arm piece 50B 50AS Cylindrical hole of the arm piece 50A 50BP Columnar protrusion of the arm piece 50B 51 Power supply member 54A, 54B Welding tip 52, 53 Cylinder 52A, 53A Piston rod 55 Support member 56A, 56B Handle 57A, 57B Switch 60 Welding control device 61 Operation panel 62 Power supply unit 600 Control 601 drive unit W, W2 weld object Wr periphery Wo opening Ws internal side

The spot welder of the present invention includes a table for placing an object to be welded, an upright arrangement on the table, an insulating plate, a side conductive plate arranged in close contact with one surface of the insulating plate, and the other surface Each of the first and second arm pieces formed in a substantially U-shape and symmetrically arranged opposite to each other, the first and second arm pieces being formed in a substantially U shape. One end portion of each of the second arm pieces is slidably connected to each other in the horizontal direction, and the other end portion of each of the first and second arm pieces is opposed to the opposing direction of the first and second arm pieces. Extending portions extending in the horizontal direction while maintaining a constant distance from the other arm at a right angle with respect to the other arm, and the first and second arm pieces at the distal end portions of the extending portions . A welding tip provided in the same direction as the opposing direction of the second arm piece. A current-carrying arm, a suspending tool capable of vertically moving the pressurization-powered arm and rotating in a horizontal direction, and a linear motion for moving the pressurization-powered arm together with the suspension tool in the horizontal direction A guide, a first drive unit that moves the first arm piece of the pressurizing energizing arm in a direction away from the direction approaching the second arm piece, and the second drive unit of the pressurizing energizing arm. A second drive unit that moves the arm piece in a direction away from and away from the first arm piece, a first switch for operating the first drive unit, and the second switch By detecting the operation of the second switch for actuating the drive unit and the first switch, the first drive unit is controlled so as to obtain a pressurizing force necessary for welding, and the second switch By detecting switch operation, welding And a control unit for controlling the second driving portion so that the necessary pressure is obtained, the.

In the arm piece 50A, one end portion 50A1 is bent at a right angle, the other end portion 50A2 is bent at a right angle in the same direction as the one end portion 50A1, and a previous portion (hereinafter referred to as an “extension portion”) 50A3. Is further bent in a right angle direction (turned 90 degrees toward the front of the drawing) (the extended portion 50A3 of the arm piece 50A is perpendicular to the opposing direction of the arm pieces 50A and 50B and the arm). It extends in the horizontal direction while keeping the distance from the piece 50B constant). A welding tip 54A is disposed at the distal end portion of the extending portion 50A3 of the arm piece 50A in the same direction as the facing direction of the arm pieces 50A and 50B . A cylindrical hole 50AS extending in the axial direction is formed at one end 50A1 of the arm piece 50A. An extending portion 50A3 extending to the other end 50A2 of the arm piece 50A extends in the same direction as the attachment direction of the handle 56A.

Similarly to the arm piece 50A, the arm piece 50B has one end portion 50B1 bent at a right angle and the other end portion 50B2 bent at a right angle in the same direction as the one end portion 50B1. 50B3 is further bent in a right angle direction (turned 90 degrees toward the front side of the drawing) (the extended portion 50B3 of the arm piece 50B is in the opposite direction of the arm pieces 50A and 50B). And extends in the horizontal direction while keeping the distance from the arm piece 50A constant) . A welding tip 54B is disposed at the distal end portion of the extending portion 50B3 of the arm piece 50B in the same direction as the facing direction of the arm pieces 50A and 50B . A cylindrical protrusion 50BP that protrudes in the axial direction is formed at one end 50B1 of the arm piece 50B. This columnar protrusion 50BP can be inserted into a cylindrical hole 50AS formed in one end 50A1 of the arm piece 50A. An extending portion 50B3 extending to the other end 50B2 of the arm piece 50B extends in the same direction as the attachment direction of the handle 56B.

Claims (2)

A table on which the work piece is placed;
A current-carrying laminate comprising an insulating plate, a side conductive plate arranged in close contact with one surface of the insulating plate, and a side rear conductive plate arranged in close contact with the other surface;
Each of the first and second arm pieces is formed in a substantially U-shape and symmetrically arranged opposite to each other, and one end portions of the first and second arm pieces are slidably connected to each other in the horizontal direction. Each of the other end portions is provided with an extending portion extending in a direction perpendicular to the horizontal direction with respect to the opposing direction of the first and second arm pieces, and the extending portion is provided with the first portion. , A pressurized energizing arm provided with a welding tip in the same direction as the opposing direction of the second arm piece;
A lifting tool that can vertically move the pressurizing energizing arm and suspends the pressurizing energizing arm in a horizontal direction,
A linear motion guide for moving the pressurizing energizing arm in a horizontal direction together with the suspension;
A first drive unit for moving the first arm piece of the pressurizing energizing arm in a direction away from a direction approaching the second arm piece;
A second drive unit that moves the second arm piece of the pressurizing energizing arm in a direction away from a direction approaching the first arm piece;
A first switch for operating the first drive unit;
A second switch for actuating the second drive unit;
Necessary for welding by detecting the operation of the first switch to control the first drive unit so as to obtain the pressurizing force necessary for welding and detecting the operation of the second switch. A control unit that controls the second drive unit so as to obtain an appropriate pressure force;
Spot welding machine with. A first handle provided on one surface side of the pressurizing energizing arm body in the same direction as the extending direction of the extending portion of the first arm piece, and the first switch is disposed;
A second arm provided on the opposite side of the one surface side of the pressurizing and energizing arm main body in the same direction as the extending direction of the extending portion of the second arm piece, wherein the second switch is disposed; The handle,
A marking member that associates the first arm piece with the first switch and the second arm piece with the second switch;
The spot welder according to claim 1, comprising: