RESISTANCE WELDING DEVICE

Abstract

The invention relates to a resistance welding device that can resistance weld a portion of an electrical wire strand to a connecting portion of a terminal component while reducing the elongation of the strand portion.A resistance welding device 1 includes a first electrode 11, a second electrode 12 configured to, while a bonding portion T11 on the first electrode 11 and a strand portion W11 of an electric wire W1 are sandwiched between the first electrode 11 and the second electrode 12, perform resistance welding of the strand portion W11 on the bonding portion T11 by being applied with an electric current while applying pressure on the first electrode 11, and an adjustment stop 13 arranged, at least during resistance welding, on a front face of an end W111 of the strand portion W11 of the electric wire W1 in an extension direction D13 of the strand portion W11 to restrict the elongation of the strand portion W11 by coming into contact with the end W111 of the strand portion W11 which is inclined to elongate in the extension direction D13. Figure for the abridged version: 1.

Description

Title of the invention: RESISTANCE WELDING DEVICE technical field

[0001] The present invention relates to a resistance welding device which resistance welds a portion of an electrical wire strand onto a flat plate-shaped connecting portion of a terminal component. Technological background

[0002] Conventionally, resistance welding devices that resistanceally weld a portion of an electrical wire strand to a flat plate-shaped connecting portion of a terminal component are widely used (see, for example, patent document 1). In the resistance welding device described in patent document 1, the connecting portion of the terminal component and the strand portion are placed and sandwiched between a pair of electrodes, and the strand portion is resistance welded to the connecting portion by applying pressure and passing an electric current through the electrodes.

[0003] Related art

[0004] Patent document 1: JP2023161119 A Summary of the invention Technical problem

[0005] Here, in the resistance welding device described above, during resistance welding, the strand portion elongates in the extension direction on the bonding portion due to pressure from the electrodes or plastic deformation of the strand portion itself. If the elongation of the strand portion becomes excessive, this can degrade the quality of the assembly between the electrical wire and the terminal component of the electrical wire attached to the terminal, which is undesirable.

[0006] Therefore, considering the aforementioned problems, the present invention aims to provide a resistance welding device that can resistance weld a portion of a wire strand to a connecting portion of a terminal component while reducing the elongation of the strand portion. Solution to the problem

[0007] In order to solve the aforementioned problems, a resistance welding device includes a first electrode on which a flat plate-shaped bonding portion of a terminal component having the bonding portion is placed, a second electrode configured so that, in a state where the bonding portion on the first electrode and a strand portion of an electrical wire placed on the bonding portion are sandwiched between the first electrode and the second electrode, perform a resistance welding of the strand portion on the bonding portion by being applied with an electric current jointly with the first electrode while performing at least one action among the application of pressure on the first electrode or the receipt of pressure from the first electrode, as well as an adjustment stop arranged, at least during the resistance welding, on a front face of one end of the strand portion in an extension direction of the strand portion of the electric wire to restrict the elongation of the strand portion by coming into contact with the end of the strand portion which is inclined to elongate in the extension direction.

[0008] Advantages provided by the invention

[0009] According to the resistance welding device described above, a portion of a strand of an electrical wire can be resistance welded to a bonding portion of a terminal component while reducing the elongation of the strand portion. Brief description of the figures

[0010] The invention will be better understood, and other objects, details, features and advantages thereof will become more apparent from the following description of several particular embodiments of the invention, given solely by way of illustration and not limitation, with reference to the accompanying drawings.

[0011] Fig. 1 schematically represents a side view illustrating a resistance welding device according to one embodiment.

[0012] Fig. 2 schematically represents a perspective view illustrating the resistance welding device illustrated in Fig. 1.

[0013] Fig. 3 is a perspective view of an adjustment stop illustrated in Figures 1 and 2, viewed in the direction of arrow Vil in Fig. 1. Figure 4 schematically represents a side view identical to Figure 1, illustrating a comparative example of the resistance welding device shown in Figures 1 to 3.

[0014] Detailed description of the embodiment examples

[0015] An embodiment of a resistance welding device will be described below.

[0016] Figure 1 schematically represents a side view illustrating a resistance welding device according to one embodiment. Figure 2 schematically represents a perspective view illustrating the resistance welding device illustrated in Figure 1.

[0017] The resistance welding device 1 according to the present embodiment is a device for resistance welding a portion of strand W11 exposed at one end of an electrical wire W1 onto a plate-shaped connecting portion Plate Tl 1 of a terminal component Tl by applying pressure and passing an electric current. The resistance welding device 1 includes a first electrode 11, a second electrode 12, an adjustment stop 13 and guide elements 14.

[0018] The first electrode 11 is, in the figure, a lower electrode on which the connecting portion Tl 1 of the terminal component Tl is placed. The first electrode 11 is a rectangular columnar electrode arranged vertically in a vertical direction DI 1, and a first rectangular flat surface 111 on which the connecting portion Tl 1 is placed is formed at the upper end of the first electrode 11. In the present embodiment, the first electrode 11 is a fixed electrode that is fixed in a predetermined installation position.

[0019] The second electrode 12 is an upper electrode in the figure that applies pressure towards the first electrode 11, with the bonding portion Tl 1 on the first electrode 11 and the strand portion W11 of the electrical wire W1 placed on the bonding portion Tl 1, which are sandwiched between the first electrode 11 and the second electrode 12. The second electrode 12 is a rectangular columnar movable electrode arranged vertically in the vertical direction DI 1 and configured such that the lower end of the second electrode 12 descends in a downward pressure direction D12 towards the first electrode 11. As it descends, the lower end of the second electrode 12 presses the strand portion W11 against the bonding portion Tl 1. In this state, the second electrode 12 is energized along with the first electrode 11 to resistance weld the strand portion W11 to the bonding portion Tl 1 1.A second rectangular flat surface 121 is formed on the lower end of the second rectangular columnar electrode 12 and is positioned opposite the first flat surface 111 of the first electrode 11 so as to sandwich the bonding portion Tl 1 and the strand portion W11 between the second flat surface 121 and the first electrode 11. This second flat surface 121 is moved towards the first flat surface 111 of the first electrode 11, which is the fixed electrode, so as to apply pressure on the strand portion W11 such that the strand portion W11 is pressed against the bonding portion Tl 1.

[0020] The adjusting stop 13 is an element disposed on a front face of an end W111 of the strand portion W11 of the electrical wire W1 in an extension direction D13 of the strand portion W11 during resistance welding. The adjusting stop 13 comes into contact with the end W111 of the strand portion W11 that is inclined to extend in the extension direction D13, in order to adjust the extension of the strand portion W11.

[0021] Fig. 3 is a perspective view of an adjustment stop illustrated in Figures 1 and 2, viewed in the direction of arrow Vil in Fig. 1.

[0022] The adjusting stop 13 illustrated in figures 1 to 3 is an element having a generally rectangular columnar appearance extending in an adjusting extension direction D14 which intersects both the extension direction D13 of the strand portion W11 and the pressure direction D12 in which the second electrode 12 descends. A portion of adjusting wall 131 is provided on the rear face of the adjusting stop 13 in the extension direction D13, such that a flat contact surface 131a of the portion of adjusting wall 131 faces the end W111 of the strand portion W11. The adjusting wall portion 131s' extends such that an edge 131b of the adjusting wall portion 131 reaches an installation surface Tl 11, for the strand portion W11, of the link portion Tl 1. In addition, a recessed interference avoidance portion 132 is provided on the front face of the adjusting wall portion 131 in the extension direction DI3.The interference-avoiding recessed portion 132 is a portion that is formed according to a recessed shape corresponding to a predetermined protruding shape which is assumed to serve as a shape for a front face portion T12 in the extension direction D13 of the terminal component T1, so as to avoid interference with the front face portion T12.

[0023] In this embodiment, the adjusting stop 13 is provided to move between an adjustment position PI (Figures 1 to 3) and a retracted position P2 ([Fig. 1]) as described below. The adjustment position PI is a position where the edge 131b of the adjusting wall portion 131 is in contact with the installation surface Tl 11 of the connecting portion Tl 1 and where the adjusting wall portion 131, on the front face of the end W111 of the strand portion W11, can come into contact with the end W111. The retracted position P2 is located at a distance from the setting position PI so as not to interfere with the placement of the bonding portion Tl 1 and the strand portion W11 on the first electrode 11. In the present embodiment, as illustrated by a dashed line in [Fig.1], the retracted position P2 is located on the upper face at a distance from the setting position PI in the vertical direction DI 1.During resistance welding, the adjustment stop 13 is lowered from the retracted position P2 to the adjustment position PL.

[0024] Furthermore, in the PI setting position during resistance welding, the setting stop 13 is arranged at a position such that a space L11 corresponding to a predetermined elongation tolerance margin of the strand portion W11 is opened between the setting stop 13 and the second electrode 12 in the extension direction D13 of the strand portion W11.

[0025] In the resistance welding device 1 according to the present embodiment, as illustrated in [Fig. 2], the guiding elements 14 are provided to guide the displacement of the second electrode 12 in the pressure direction D12 towards the first electrode 11. The guide elements 14 include a pair of rectangular columnar elements which are arranged in a horizontal orientation so that the downward path of the second electrode 12 is sandwiched between their ends in the left-right direction D15 when viewed in the extension direction D13 of the strand portion W11.

[0026] Fig. 4 schematically represents a side view identical to Fig. 1, illustrating a comparative example of the resistance welding device shown in Figures 1 to 3. In Fig. 4, the equivalent components to those shown in Fig. 1 are designated by the same reference numbers as in Fig. 1 only for the components useful for explaining the figure, and in what follows, the explanations already given for these equivalent components will not be repeated.

[0027] In a resistance welding device 5 according to a comparative example illustrated in [Fig. 4], a first electrode 11 and a second electrode 12 in rectangular columnar shape, equivalent to those of the embodiment described above, are arranged opposite each other. The second electrode 12 descends in the direction of pressure D12, such that a second rectangular flat surface 121 on its lower end applies pressure to a portion of strand W11 against a portion of the bond Tl1 of a terminal component Tl placed on a first flat surface 111 on the upper end of the first electrode 11, which is a fixed electrode. While this pressure is applied, an electric current flows so that the portion of strand W11 is resistance welded to the portion of the bond Tl1.During resistance welding, the strand portion W11 can extend in the extension direction D13 on the bond portion Tl 1 due to pressure from the electrode or plastic deformation of the strand portion W11 itself, but the resistance welding device 5 according to this comparative example is not equipped with a mechanism for reducing an extension W15 of the strand portion W11.

[0028] Unlike this comparative example, the resistance welding device 1 according to the embodiment described above regulates the elongation of the strand portion W11 during resistance welding with the adjustment stop 13, which is disposed on the front face of the end W111 of the strand portion W11 to come into contact with the end W111 of the strand portion W11. In other words, the aforementioned resistance welding device 1 includes the adjustment stop 13, so that the resistance welding device 1 can resistance weld the strand portion W11 of the electrical wire W1 to the connecting portion Tl 1 of the terminal component Tl while reducing the elongation of the strand portion W11.

[0029] In this embodiment, the adjustment stop 13 is provided to be movable between the adjustment position PI, at which the adjustment stop 13 can come into contact with the end W111 of the strand portion W11, and the retracted position P2, which is spaced away from the adjustment position PI. It is positioned at the adjustment position PI during resistance welding. According to this configuration, when the bonding portion Tl1 and the strand portion W11 are placed on the first electrode 11 before resistance welding, the adjustment stop 13 can be retracted to the retracted position P2, which makes it much easier to position the bonding portion Tl1 and the strand portion W11.

[0030] Furthermore, in this embodiment, the adjustment stop 13 is positioned such that a gap LU, corresponding to the predetermined elongation tolerance of the strand portion W11, is open between the adjustment stop 13 and the second electrode 12 during resistance welding. According to this configuration, when the second electrode 12 is moved towards the first electrode 11 to apply pressure, the gap LU allows the second electrode 12 to move smoothly. Moreover, since the gap LU corresponds to the elongation tolerance of the strand portion W11, the elongation of the strand portion W11 can be effectively reduced.

[0031] Furthermore, in this embodiment, the adjustment stop 13 is provided with the adjustment wall portion 131 for adjusting the elongation so that the edge 131b reaches the mounting surface T111, for the strand portion W11, of the connecting portion Tl 1. On the front face in the extension direction D13 of the adjustment wall portion 131 of the adjustment stop 13, an interference-avoiding recessed portion 132 is provided to prevent interference with the front face portion T12 of the terminal component Tl. According to this configuration, the interference-avoiding recessed portion 132 is provided in the adjustment stop 13, so that the adjustment stop 13 can adjust the elongation notwithstanding the fact that the front face portion T12 of the terminal component Tl has a protruding shape. In other words, the adaptability of the types of terminal components Tl that can be supported by the adjustment stop 13 can be improved.Furthermore, the flat contact surface 131a of the wide adjusting wall portion 131 extending to the installation surface Tl 11 of the connecting portion Tl 1 can be brought into contact with the end W111 of the strand portion W11, thus effectively restricting elongation.

[0032] Furthermore, in the present embodiment, the guide elements 14 are provided to guide the movement of the second electrode 12 when the second electrode 12 moves towards the first electrode 11. According to this configuration, the guide elements 14 can also stabilize the movement of the electrode during resistance welding, which is advantageous.

[0033] It should be noted that the embodiment described above is simply a representative aspect of the resistance welding device and that the resistance welding device is not limited to this and can be implemented in various modified forms.

[0034] By way of example, in the embodiment described above, the resistance welding device 1, in which, of the first electrode 11 and the second electrode 12, only the second electrode 12 moves to apply pressure to the first electrode 11, is shown as an example of a resistance welding device. However, the resistance welding device is not limited to this example, and only the first electrode can move to apply pressure and the second electrode can receive pressure from the first electrode. Alternatively, both electrodes, the first and the second, can move, and each electrode can apply pressure and receive pressure from the other electrode.

[0035] Furthermore, in the embodiment described above, the resistance welding device 1, in which each of the electrodes, the first electrode 11 and the second electrode 12, is a rectangular columnar electrode arranged in a vertical direction DI 1, is shown as an example of a resistance welding device. However, the resistance welding device is not limited to this example, and the specific arrangement and shape of the first and second electrodes are not particularly restricted.

[0036] Furthermore, in the embodiment described above, the resistance welding device 1, which includes the adjustment stop 13 arranged to be movable between the setting position PI and the retracted position P2 and positioned at the setting position PI during resistance welding, is shown as an example of a resistance welding device. However, the resistance welding device is not limited to this and, by way of example, the adjustment stop can be fixed in the setting position without retraction. However, as described above, when the adjustment stop 13 is arranged to be movable between the setting position PI and the retracted position P2, the placement of the bonding portion T11 and the strand portion W11 can be achieved more easily by retracting the adjustment stop 13.In the embodiment described above, the retracted position P2, located on the upper face at a distance from the adjustment position PI, is represented as an example of a retracted position of an adjustment stop. However, the retracted position is not limited to this, and can be a position at a distance from the adjustment position, either on the lower face or in the right and left directions, and the specific relationship in the position with reference to the adjustment position can be appropriately defined.

[0037] Furthermore, in the embodiment described above, the resistance welding device 1, in which, during resistance welding, the adjustment stop 13 is positioned such that the gap L11 corresponding to the predetermined elongation tolerance margin of the strand portion W11 is open between the adjustment stop 13 and the second electrode 12, is shown as an example of a resistance welding device. However, the resistance welding device is not limited to this example, and the specific relationship in the relative position between the second electrode and the adjustment stop can be configured appropriately. However, as described above, when the gap L11 is provided, the second electrode 12 can be moved smoothly and the elongation of the strand portion W11 can be effectively reduced.

[0038] Furthermore, in the embodiment described above, the adjustment stop 13, which includes the adjustment wall portion 131 extending such that the edge 131b of the adjustment wall portion 131 reaches the installation surface Tl 11, for the strand portion W11, of the link portion Tl 1, and which includes the interference-avoiding recessed portion 132 provided on the front face of the adjustment stop 13, is shown by way of example of an adjustment stop. However, the adjustment stop is not limited to this, and may be, by way of example, a simple rectangular columnar element or similar that does not have a recessed or similar portion for the purpose of avoiding interference and that is arranged with a space between the rectangular columnar element and the installation surface of the link portion for the purpose of avoiding interference.In this case, the end of the strand portion comes into contact with only a part on the upper face of the end of the adjustment stop. However, as described above, according to the adjustment stop 13 provided with the recessed interference-avoiding portion 132 and the adjustment wall portion 131 having the edge 131b which reaches the installation surface Tl 11, the elongation can be effectively adjusted by the wide adjustment wall portion 131 while the adaptability is improved.

[0039] The resistance welding device 1 equipped with guide elements 14 that guide the electrode is shown as an example of a resistance welding device. However, the resistance welding device is not limited to this example, and the electrode can be moved without the guidance described above. However, as described above, when guide elements 14 for moving the electrode are provided, the movement of the electrode during resistance welding can also be stabilized.

[0040] List of reference signs 1 resistance welding device 11 first electrode 12 second electrode 13 adjustment stop 14 guide elements 111 first flat surface 121 seconds flat surface 131 adjustment wall portion 131a flat contact surface 131b edge 132. Interference avoidance cut-out portion FROM the vertical direction D12 pressure direction D13 extension direction D14 adjustment extension direction D15 right and left direction LU space PI setting position P2 retracted position Terminal component Tl 1 linking portion T12 front face portion TL 11 installation area W1 electrical wire W11 portion of strand W111 end

Claims

Demands

1. Resistance welding device (1) comprising: a first electrode (11) on which a flat plate bonding portion (Tl 1) of a terminal component (Tl) having the bonding portion (Tl 1) is placed; a second electrode (12) configured to, in a state where the bonding portion (Tl 1) on the first electrode (11) and a strand portion (W11) of an electric wire (Wl) placed on the bonding portion (Tl 1) are sandwiched between the first electrode (11) and the second electrode (12), perform resistance welding of the strand portion (W 11) on the bonding portion (Tl 1) by being applied with an electric current jointly with the first electrode (11) while performing at least one action among the application of pressure on the first electrode (11) or the receipt of pressure from the first electrode (11);and an adjustment stop (13) arranged, at least during resistance welding, on a front face of one end of the strand portion (W 11) in an extension direction (D13) of the strand portion (W11) of the electric wire (W 1) to restrict the elongation of the strand portion (W 11) by coming into contact with the end of the strand portion (W 11) which is inclined to elongate in the extension direction (D13).

2. Resistance welding device (1) according to claim 1, wherein the setting stop (13) is provided to be movable between a setting position (PI) where the setting stop (13), on the front face of the end of the strand portion (W 11), can come into contact with the end, and a retracted position (P2) located at a distance from the setting position (PI) so as not to interfere with the placement of the bonding portion (Tl 1) and the strand portion (W 11) on the first electrode (H), and the setting stop (13) is positioned at the setting position (PI) during resistance welding.

3. Resistance welding device (1) according to claim 1, wherein, during resistance welding, the adjustment stop (13) is arranged at a position such that a space corresponding to a predetermined elongation tolerance margin of the portion of strand (W11) is open between the adjustment stop (13) and the second electrode (12) in the extension direction (D13).

4. Resistance welding device (1) according to claim 1, wherein the adjustment stop (13) is provided with an adjustment wall portion (131) having a flat contact surface (131a) facing the end of the strand portion (W 11), such that an edge of the adjustment wall portion (131) reaches an installation surface for the strand portion (W 11) of the connecting portion (TU), and the adjustment stop (13) is provided with an interference-avoiding recessed portion (132) formed according to a recessed shape corresponding to a predetermined protrusion shape that is assumed to serve as the shape for a front face portion (T12) of the terminal component (T1) in the extension direction (D13) on a front face of the adjustment wall portion (131) in the extension direction (D13), so as to avoid the interference with the front panel portion (T 12).

5. Resistance welding device (1) according to claim 1, further comprising a guide element (14), wherein when at least one electrode among the first electrode (11) and the second electrode (12) moves towards the other electrode among the first electrode (11) and the second electrode (12), the guide element (14) guides the movement.

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