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 on which a connected portion T11 of a terminal component T1 is placed, and a second electrode 12 that is energized while applying pressure to the first electrode 11 to resistance-weld a strand portion W11 of an electric wire W1 to the connected portion T11. The second electrode 12 comprises: a nipping part 121 that nips the connected portion T11 and the strand portion W11, between the first electrode 11 and the part; and a restricting protrusion 122 that protrudes from the nipping part 121 toward the first electrode 11, at a front side of a tip W111 of the strand portion W11, in an extending direction D13 of the strand portion W11, and contacts the tip W111 of the strand portion W11 that tries to extend in the extending direction D13 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 capable of resistance welding to the connecting 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 includes a first electrode on which a connection portion of a terminal part having a flat connection portion is placed, and a second electrode that sandwiches the connection portion on the first electrode and a 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, wherein the second electrode includes a clamping portion that sandwiches the connection portion and the wire portion between the first electrode and the second electrode, and a restricting protrusion that protrudes from the clamping portion toward the first electrode in front 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 during resistance welding, thereby restricting 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 wire portions of the electric wire to the connecting portions of the terminal components while suppressing elongation of the wire portions. [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 schematic side view similar to FIG. 1 showing a comparative example of the resistance welding apparatus shown in FIGS. 1 and 2. FIG. 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 passing an electric current. The resistance welding apparatus 1 includes a first electrode 11, a second electrode 12, and a guide member 13.

[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 movable electrode with a rectangular column shape that stands upright in a vertical direction D11 and descends with its lower end in a pressure direction D12 downward toward the first electrode 11. As it descends, the lower end applies pressure to the strand portion W11 so as to press it 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. The lower end of the rectangular column-shaped second electrode 12 is provided with a clamping portion 121 that clamps the connection portion T11 and the strand portion W11 between the second electrode 12 and the first electrode 11. Furthermore, this clamping portion 121 is formed with a rectangular second flat surface 121a that is arranged opposite the first flat surface 111 of the first electrode 11, and when this second flat surface 121a is moved toward the first flat surface 111 of the first electrode 11, which is the fixed electrode, pressure is applied so that the wire portion W11 is pressed against the connection portion T11.

[0014] The second electrode 12 is provided with a restricting protrusion 122 that restricts elongation of the wire portion W11 due to pressure applied during resistance welding and plastic deformation of the wire portion W11 itself. The restricting protrusion 122 is formed to protrude from the clamping portion 121 toward the first electrode 11 on the front side of the tip W111 of the wire portion W11 in the extending direction D13 of the wire portion W11 of the electric wire W1. The restricting protrusion 122 abuts against the tip W111 of the wire portion W11 that tends to extend in the extending direction D13 during resistance welding, thereby restricting the elongation of the wire portion W11.

[0015] In this embodiment, the restricting protrusion 122 is a rib wall that protrudes from the second flat surface 121a of the clamping portion 121 so as to extend in a rib length direction D14 that intersects with the extending direction D13. More specifically, the restricting protrusion 122 extends in the rib length direction D14 on the front edge of the rectangular second flat surface 121a in the extending direction D13. The wall thickness L11 of the rib wall serving as the restricting protrusion 122 is shorter than the length L12 in the extending direction D13 of the surface portion 121b of the second flat surface 121a that contacts the wire portion W11.

[0016] 2, the resistance welding apparatus 1 of this embodiment is provided with guide members 13 that guide the movement of the second electrode 12 in the pressure direction D12 toward the first electrode 11. The guide members 13 are a pair of rectangular column-shaped members that are arranged horizontally so that their tips 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.

[0017] Figure 3 is a schematic side view similar to that of Figure 1 showing a comparative example to the resistance welding apparatus shown in Figures 1 and 2. In Figure 3, 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.

[0018] In the resistance welding apparatus 5 of the comparative example shown in FIG. 3 , the second electrode 52 is a simple rectangular columnar electrode, similar to the first electrode 11. As the second electrode 52 descends in the pressure direction D12, the rectangular second flat surface 521a at the lower end presses 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 pressure is applied, 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 above 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 stretch W15 of the wire portion W11.

[0019] 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 protrusion 122 that is provided on the second electrode 12 and abuts against the tip W111 of the wire portion W11. In other words, according to this embodiment, by providing this restricting protrusion 122 on the second electrode 12, the wire portion W11 of the electric wire W1 can be resistance welded to the connection portion T11 of the terminal part T1 while restricting the elongation of the wire portion W11.

[0020] In this embodiment, the first electrode 11 has a first flat surface 111, the clamping portion 121 of the second electrode 12 has a second flat surface 121a, and the restricting protrusion 122 is a rib wall that protrudes from the second flat surface 121a and extends in the rib length direction D14. With this configuration, the connection portion T11 of the terminal part T1 and the wire portion W11 of the electric wire W1 are sandwiched between two flat surfaces, the first flat surface 111 of the first electrode 11 and the second flat surface 121a of the second electrode 12, allowing resistance welding to be performed with the welding object in a stable position. In addition, providing a rib wall as the restricting protrusion 122 effectively blocks the movement of the tip W111 of the wire portion W11 that tends to stretch, thereby restricting the stretch.

[0021] In this embodiment, the wall thickness L11 of the rib wall is shorter than the length L12 of the surface portion 121b of the second flat surface 121a that contacts the wire portion W11. This configuration makes it possible to effectively provide the rib wall while minimizing the occupation of the restricting protrusion 122 around the terminal part T1.

[0022] Furthermore, in this embodiment, a guide member 13 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 13 is preferable because it can also stabilize the movement of the electrodes during resistance welding.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] Furthermore, in the above-described embodiment, the resistance welding apparatus 1 is exemplified as an example of a resistance welding apparatus, in which the wire portion W11 and the connection portion T111 are clamped and pressurized between the first flat surface 111 of the first electrode 11 and the second flat surface 121a of the clamping portion 121 of the second electrode 12. Furthermore, in the present embodiment, the restricting protrusion is exemplified as an example of a restricting protrusion, which is a rib wall protruding from the second flat surface 121a of the clamping portion 121. However, the resistance welding apparatus and the restricting protrusion are not limited thereto. For example, either or both of the portions of the first electrode and the second electrode that contact the wire portion of the electric wire or the connection portion of the terminal component may be curved, and the shape of the restricting protrusion may be a shape other than a rib wall, such as a rod-like protrusion. However, as described above, the configuration in which pressure is applied with two flat surfaces stabilizes the posture of the welding object, and the restricting protrusion 122 is a rib wall that effectively blocks the movement of the tip W111 of the wire portion W11 to restrict elongation.

[0027] In the above-described embodiment, as an example of the rib wall as a restricting protrusion, a rib wall having a wall thickness L11 shorter than the length L12 of the surface portion 121b on the second flat surface 121a that contacts the wire portion W11 is exemplified. However, the rib wall as a restricting protrusion is not limited to this, and the wall thickness and the like can be set appropriately. However, as described above, by making the wall thickness L11 of the rib wall shorter than the length L12 of the surface portion 121b on the second flat surface 121a, it is possible to reduce the occupation of the restricting protrusion 122 around the terminal part T1.

[0028] In addition, in this embodiment, a resistance welding apparatus 1 provided with a guide member 13 that guides electrode movement is shown as an example of a resistance welding apparatus. 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 13 for electrode movement, the electrode movement during resistance welding can also be stabilized. [Explanation of symbols]

[0029] 1 Resistance welding equipment 11 1st electrode 12 2nd electrode 13 Guide member 111 1st flat surface 121 Clamping part 121a 2nd flat surface 121b surface part 122 Regulating protrusion D11 Vertical direction D12 Pressure direction D13 Extension direction D14 Rib length direction D15 Left / right direction L11 Rib wall thickness L12 Length of the surface T1 terminal parts T11 connection part 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 configured to sandwich 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 to resistance-weld the strand portion to the connection portion by applying pressure to the first electrode and receiving pressure from the first electrode and passing current through the second electrode together with the first electrode, The second electrode is a clamping portion that clamps the connection portion and the wire portion between the first electrode and the clamping portion; a restricting protrusion that protrudes from the clamping portion toward the first electrode on the front side of a tip of the wire portion in the extending direction of the wire portion of the electric wire, and that abuts against the tip of the wire portion that tends to extend in the extending direction during the resistance welding to restrict the extension of the wire portion; A resistance welding device comprising:

2. the first electrode has a first flat surface on which the connection portion is placed, a second flat surface disposed opposite to the first flat surface is formed in the sandwiching portion of the second electrode; 2. The resistance welding device according to claim 1, wherein the restricting protrusion of the second electrode is a rib wall protruding from the second flat surface so as to extend in a rib length direction intersecting with the extending direction.

3. 3. The resistance welding device according to claim 2, wherein the wall thickness of the rib wall is shorter than the length in the extending direction of the surface portion of the second flat surface that contacts the wire portion.

4. 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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