Resistance-welding device

Abstract

To provide a resistance-welding device that can apply resistance-welding to a connected portion of a terminal component while suppressing a strand portion of an electric wire from extending.SOLUTION: A resistance-welding device 1 comprises: a first electrode 11; a second electrode 12 that is energized while applying pressure to the first electrode 11 to resistance-weld a strand portion W11 to the connected portion T11, in a state where the connected portion T11 on the first electrode 11 and the strand portion W11 of an electric wire W1 are sandwiched between the first electrode 11 and the second electrode; and a restricting stopper 13 that is arranged at a front side of a tip W111 of the strand portion W11, in an extending direction D13 of the strand portion W11 in the electric wire W1, and contacts the tip W111 of the strand portion W11 that tries to extend in the extending direction D13, at least during resistance-welding, to restrict the strand portion W11 from extending.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a resistance welding device for resistance welding a strand portion of an electric wire to a flat connecting portion of a terminal component. [Background technology]

[0002] Resistance welding devices that resistance-weld the bare wire portion of an electric wire to a flat connecting portion of a terminal part have been widely used (see, for example, Patent Document 1). In a resistance welding device such as that described in Patent Document 1, the connecting portion of the terminal part and the bare wire portion are set between a pair of electrodes, and the bare wire portion is resistance-welded to the connecting portion by applying pressure from the electrodes and passing current through them. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2023-161119 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned resistance welding device, the wire portions may be stretched in the extension direction at the connection part due to pressure from the electrode or plastic deformation of the wire portions themselves during resistance welding. If the stretching of the wire portions becomes excessive, it may degrade the joining quality between the electric wire and the terminal part in the electric wire with terminal, which is undesirable.

[0005] SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above-mentioned problems, and has as its object to provide a resistance welding apparatus that can perform resistance welding on the joint portion of a terminal part while suppressing the elongation of the wire portion of the electric wire. [Means for solving the problem]

[0006] In order to solve the above problem, a resistance welding device is characterized by comprising: a first electrode on which a connection portion of a terminal part having a flat connection portion is placed; a second electrode which holds the connection portion on the first electrode and the wire portion of an electric wire placed on the connection portion between the first electrode and the second electrode, and resistance-welds the wire portion to the connection portion by applying pressure to the first electrode and / or receiving pressure from the first electrode while passing current through the first electrode; and a restricting stopper which, at least during the resistance welding, is positioned forward of the tip of the wire portion in the extension direction of the wire portion of the electric wire and abuts against the tip of the wire portion that attempts to extend in the extension direction to restrict the extension of the wire portion. [Effects of the Invention]

[0007] According to the above-described resistance welding device, it is possible to resistance-weld the wires to the joints of the terminal components while suppressing the elongation of the wires. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a schematic side view showing a resistance welding apparatus according to an embodiment; [Figure 2] FIG. 2 is a schematic perspective view showing the resistance welding apparatus shown in FIG. 1. [Figure 3] 3 is a perspective view of the restriction stopper shown in FIGS. 1 and 2, as viewed from the direction of arrow V11 in FIG. [Figure 4] FIG. 4 is a schematic side view similar to FIG. 1 showing a comparative example to the resistance welding apparatus shown in FIGS. 1 to 3. DETAILED DESCRIPTION OF THE INVENTION

[0009] An embodiment of the resistance welding device will be described below.

[0010] FIG. 1 is a schematic side view showing a resistance welding apparatus according to one embodiment, and FIG. 2 is a schematic perspective view showing the resistance welding apparatus shown in FIG.

[0011] The resistance welding apparatus 1 of this embodiment is an apparatus that resistance-welds an exposed wire portion W11 at an end of an electric wire W1 to a flat connection portion T11 of a terminal part T1 by applying pressure and current. The resistance welding apparatus 1 includes a first electrode 11, a second electrode 12, a restricting stopper 13, and a guide member 14.

[0012] The first electrode 11 is a lower electrode in the drawing on which the connection portion T11 of the terminal part T1 is placed. The first electrode 11 is a rectangular columnar electrode arranged upright in the vertical direction D11, and has a first flat surface 111 of a rectangular shape formed on its upper end on which the connection portion T11 is placed. In this embodiment, the first electrode 11 is a fixed electrode that is fixed to a predetermined installation position.

[0013] The second electrode 12 is the upper electrode in the figure that applies pressure to the first electrode 11 while sandwiching the connection portion T11 on the first electrode 11 and the strand portion W11 of the electric wire W1 placed on the connection portion T11 between the first electrode 11 and the second electrode 12. The second electrode 12 is a rectangular columnar moving electrode that stands in a vertical direction D11 and descends with its lower end in a downward pressure direction D12 toward the first electrode 11. As it descends, the lower end presses the strand portion W11 against the connection portion T11. In this state, the second electrode 12 is energized together with the first electrode 11 to resistance-weld the strand portion W11 to the connection portion T11. In addition, the lower end of the rectangular columnar second electrode 12 is formed with a rectangular second flat surface 121 that faces the first flat surface 111 of the first electrode 11 so as to sandwich the connection portion T11 and the strand portion W11 between the second electrode 12 and the first electrode 11. When the second flat surface 121 is moved toward the first flat surface 111 of the first electrode 11, which is a fixed electrode, pressure is applied so that the wire portion W11 is pressed against the connection portion T11.

[0014] The restricting stopper 13 is a member disposed in front of the tip W111 of the wire portion W11 of the electric wire W1 in the extending direction D13 of the wire portion W11 during resistance welding. The restricting stopper 13 comes into contact with the tip W111 of the wire portion W11 that attempts to extend in the extending direction D13, thereby restricting the extension of the wire portion W13.

[0015] 3 is a perspective view of the restriction stopper shown in FIGS. 1 and 2, as viewed from the direction of arrow V11 in FIG.

[0016] The restricting stopper 13 shown in FIGS. 1 to 3 is a generally rectangular columnar member extending in a restricting extension direction D14 that intersects both the extending direction D13 of the wire portion D11 and the pressure direction D12 of the lowering of the second electrode 12. A restricting wall portion 131 is provided on the rear side of the restricting stopper 13 in the extending direction D13, and the restricting wall portion 131 faces the tip end W111 of the wire portion W11 at a contact plane 131a. The restricting wall portion 131 extends such that its edge 131b reaches the installation surface T111 of the wire portion W11 at the connection portion T11. An interference avoidance recess 132 is provided on the front side of the restricting wall portion 131 in the extending direction D13. The interference avoidance recess 132 is formed in a concave shape corresponding to a predetermined convex shape assumed as the shape of the front portion T12 of the terminal part T1 in the extending direction D13, and is a portion that avoids interference with the front portion T12.

[0017] In this embodiment, the restricting stopper 13 is provided to be movable between a restricting position P1 (FIGS. 1 to 3) and a retracted position P2 (FIG. 1) as follows. The restricting position P1 is a position where the edge 131b of the restricting wall portion 131 contacts the installation surface T111 of the connection portion T11 and can abut against the tip W111 of the wire portion W11 on the front side of the tip W111. The retracted position P2 is a position away from the restricting position P1 so as not to interfere with the setting of the connection portion T11 and the wire portion W11 to the first electrode 11. In this embodiment, as shown by a dotted line in FIG. 1, the retracted position P2 is a position away from the restricting position P1 and upward in the vertical direction D11. During resistance welding, the restricting stopper 13 descends from the retracted position P2 to be positioned at the restricting position P1.

[0018] In addition, when the restricting stopper 13 is at the restricting position P1 during resistance welding, it is positioned at a position where a gap L11 corresponding to a predetermined elongation allowance of the wire portion W11 is opened between it and the second electrode 12 in the extension direction D13 of the wire portion W11.

[0019] 2, the resistance welding apparatus 1 of this embodiment is provided with guide members 14 that guide the movement of the second electrode 12 in the pressure direction D12 toward the first electrode 11. The guide members 14 are a pair of rectangular column-shaped members that are horizontally placed so that their tip ends sandwich the descending path of the second electrode 12 in the left-right direction D15 when viewed in the extension direction D13 of the wire portion W11.

[0020] Figure 4 is a schematic side view similar to that of Figure 1 showing a comparative example to the resistance welding apparatus shown in Figures 1 to 3. In Figure 4, components equivalent to those shown in Figure 1 are designated by the same reference numerals as in Figure 1 only for those components necessary for explanation, and redundant explanations of these equivalent components will be omitted below.

[0021] In the resistance welding apparatus 5 of the comparative example shown in FIG. 4, a rectangular column-shaped first electrode 11 and a second electrode 12 equivalent to those in the above-described embodiment are arranged facing each other. The second electrode 12 descends in a pressure direction D12, causing a rectangular second flat surface 121 at the lower end to press the wire portion W11 against the connection portion T11 of the terminal part T1, which is placed on the first flat surface 111 at the upper end of the first electrode 11, which is a fixed electrode. Current is passed through the wire portion W11 while the wire portion W11 is being pressed, and the wire portion W11 is resistance-welded to the connection portion T11. During resistance welding, the wire portion W11 may stretch in the extension direction D13 on the connection portion T11 due to the pressure from the electrode or plastic deformation of the wire portion W11 itself. However, the resistance welding apparatus 5 of the comparative example does not have a configuration for suppressing the stretching W15 of the wire portion W11.

[0022] In contrast to this comparative example, according to the resistance welding apparatus 1 of the above-described embodiment, the elongation of the wire portion W11 during resistance welding is restricted by the restricting stopper 13 that is disposed in front of the tip W111 of the wire portion W11 and abuts against the tip W111 of the wire portion W11. In other words, according to the above-described resistance welding apparatus 1, by providing this restricting stopper 13, the elongation of the wire portion W11 of the electric wire W1 can be restricted and the electric wire can be resistance-welded to the joint portion T11 of the terminal part T1.

[0023] In this embodiment, the restricting stopper 13 is movable between a restricting position P1 where it can come into contact with the tip W111 of the wire portion W11 and a retracted position P2 away from the restricting position P1, and is positioned at the restricting position P1 during resistance welding. With this configuration, when setting the connection portion T11 and the wire portion W11 to the first electrode 11 prior to resistance welding, the restricting stopper 13 is retracted to the retracted position P2, allowing the connection portion T11 and the wire portion W11 to be set with good workability.

[0024] In this embodiment, the restricting stopper 13 is positioned at a position where a gap L11 corresponding to a predetermined allowable elongation amount of the wire portion W11 is formed between the restricting stopper 13 and the second electrode 12 during resistance welding. With this configuration, when the second electrode 12 is moved toward the first electrode 11 to apply pressure, the provision of the gap L11 allows the second electrode 12 to move smoothly. Furthermore, because the gap L11 is a gap corresponding to the allowable elongation amount of the wire portion W11, elongation of the wire portion W11 can be effectively suppressed.

[0025] In this embodiment, the restricting stopper 13 is provided with a restricting wall portion 131 for preventing elongation, the end edge 131b of which reaches the installation surface T111 of the wire portion W11 at the connection portion T11. The restricting wall portion 131 of the restricting stopper 13 is provided on the front side in the extension direction D13 of the restricting wall portion 131, the restricting stopper 13 having an interference avoidance recess 132 for avoiding interference with the front portion T12 of the terminal component T1. With this configuration, the provision of the interference avoidance recess 132 in the restricting stopper 13 allows the restricting stopper 13 to restrict elongation regardless of whether the front portion T12 of the terminal component T1 has a convex shape. In other words, the restricting stopper 13 can be used with more versatile terminal components T1. Furthermore, the abutment plane 131a of the restricting wall portion 131, which extends over a wide area up to the installation surface T111 of the connection portion T11, abuts against the tip W111 of the wire portion W11, thereby effectively restricting elongation.

[0026] Furthermore, in this embodiment, a guide member 14 is provided to guide the movement of the second electrode 12 when it moves toward the first electrode 11. According to this configuration, the provision of the guide member 14 is preferable because it can also stabilize the movement of the electrodes during resistance welding.

[0027] The above-described embodiment merely shows a typical form of the resistance welding device, and the resistance welding device is not limited to this, but can be implemented in various modifications.

[0028] For example, in the above-described embodiment, the resistance welding apparatus 1 is exemplified as an example of a resistance welding apparatus in which only the second electrode 12 of the first electrode 11 and the second electrode 12 moves to apply pressure to the first electrode 11. However, the resistance welding apparatus is not limited to this, and may be one in which only the first electrode moves to apply pressure and the second electrode receives pressure from the first electrode. Alternatively, both the first electrode and the second electrode may move, and each electrode may apply pressure to and receive pressure from the other electrode.

[0029] In the above-described embodiment, the resistance welding apparatus 1 is exemplified as an example of the resistance welding apparatus, in which the first electrode 11 and the second electrode 12 are rectangular pillar-shaped electrodes arranged upright in the vertical direction D11. However, the resistance welding apparatus is not limited to this, and the specific arrangement and shape of the first electrode and the second electrode are not limited to this.

[0030] Furthermore, in the above-described embodiment, as an example of a resistance welding device, the resistance welding device 1 is illustrated, in which the restricting stopper 13 is movable between the restricting position P1 and the retracted position P2 and is positioned at the restricting position P1 during resistance welding. However, the resistance welding device is not limited to this, and the restricting stopper may be fixedly positioned at the restricting position without being retracted. However, as described above, by making the restricting stopper 13 movable between the restricting position P1 and the retracted position P2, the restricting stopper 13 can be retracted to set the splice portion T11 and the wire portion W11 with good workability. Note that in the above-described embodiment, the retracted position of the restricting stopper is illustrated as the retracted position P2, which is spaced upward from the restricting position P1. However, the retracted position is not limited to this, and may be a position spaced downward or to the left or right from the restricting position, and the specific positional relationship with the restricting position may be set as appropriate.

[0031] Furthermore, in the above-described embodiment, as an example of a resistance welding apparatus, a resistance welding apparatus 1 is exemplified in which a restricting stopper 13 is disposed between the second electrode 12 and the restricting stopper at a position where a gap L11 corresponding to a predetermined allowable elongation amount of the wire portion W11 is opened between the second electrode 12 and the restricting stopper during resistance welding. However, the resistance welding apparatus is not limited to this, and the relative positional relationship between the second electrode and the restricting stopper can be set as appropriate. However, as described above, by providing the gap L11, the second electrode 12 can be moved smoothly and the elongation of the wire portion W11 can be effectively suppressed.

[0032] Furthermore, in the above-described embodiment, as an example of the restricting stopper, the restricting stopper 13 is illustrated as having a restricting wall portion 131 whose edge 131b reaches the installation surface T111 of the wire portion W11 of the connection portion T11 and an interference-avoiding recess 132 provided on its front side. However, the restricting stopper is not limited to this. It may be a simple rectangular columnar member that does not have an interference-avoiding recess or the like and is disposed with a gap for interference avoidance between it and the installation surface of the connection portion. In this case, the tip of the wire portion and the restricting stopper abut only on a portion of the upper side of the tip. However, as described above, the restricting stopper 13 having the restricting wall portion 131 whose edge 131b reaches the installation surface T111 and the interference-avoiding recess 132 can effectively restrict elongation over a wide area of ​​the restricting wall portion 131 while improving versatility.

[0033] Furthermore, as an example of a resistance welding apparatus, a resistance welding apparatus 1 provided with a guide member 14 for guiding electrode movement is shown. However, the resistance welding apparatus is not limited to this, and the electrode may be moved without receiving the above-mentioned guide. However, as described above, by providing a guide member 14 for electrode movement, the electrode movement during resistance welding can also be stabilized. [Explanation of symbols]

[0034] 1 Resistance welding equipment 11 1st electrode 12 2nd electrode 13 Regulatory Stopper 14 Guide member 111 1st flat surface 121 Second flat surface 131 Regulation wall section 131a Contact plane 131b Edge 132 Interference avoidance recess D11 Vertical direction D12 Pressure direction D13 Extension direction D14 Regulation extension direction D15 Left / right direction L11 gap P1 Restricted position P2 Evacuation position T1 terminal parts T11 connection part T12 Anterior part T111 installation surface W1 electric wire W11 Wire part W111 tip

Claims

1. a first electrode of a terminal component having a flat connecting portion on which the connecting portion is placed; a second electrode that holds the connection portion on the first electrode and a strand portion of the electric wire placed on the connection portion between the first electrode and the second electrode, and that is energized together with the first electrode while applying pressure to the first electrode and / or receiving pressure from the first electrode, thereby resistance-welding the strand portion to the connection portion; a restricting stopper that is disposed in front of a tip of the wire portion of the electric wire in an extending direction of the wire portion at least during the resistance welding, and that abuts against the tip of the wire portion that is attempting to extend in the extending direction to restrict extension of the wire portion; A resistance welding device comprising:

2. 2. The resistance welding device according to claim 1, wherein the restricting stopper is movable between a restricting position where it can abut against the tip of the wire portion on the front side of the tip of the wire portion and a retracted position away from the restricting position so as not to interfere with the setting of the connection portion and the wire portion to the first electrode, and is positioned at the restricting position during the resistance welding.

3. The resistance welding device according to claim 1, characterized in that, during the resistance welding, the restricting stopper is positioned at a position where a gap corresponding to a predetermined elongation allowance of the wire portion is formed between the restricting stopper and the second electrode in the extension direction.

4. The resistance welding device described in claim 1, characterized in that the regulating stopper has a regulating wall portion that faces the tip of the wire portion at the abutment plane, and is arranged so that its edge reaches the installation surface of the wire portion at the connection portion, and an interference avoidance recess is provided on the front side of the regulating wall portion in the extension direction, which is formed in a concave shape corresponding to a predetermined convex shape assumed as the shape of the front side portion of the terminal part in the extension direction, thereby avoiding interference with the front side portion.

5. 2. The resistance welding device according to claim 1, further comprising a guide member for guiding movement of at least one of the first electrode and the second electrode when the at least one of the first electrode and the second electrode moves toward the other electrode.

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