JP2019091551A - Method for manufacturing flexible conductor - Google Patents

Abstract

To provide a method for manufacturing a flexible conductor, capable of forming terminal parts on both side of the flexible conductor obtained by superimposing a plurality of metal plates into a required shape having a flat surface, integrally fastening each metal plate of the terminal parts to improve durability and reducing manufacturing cost.SOLUTION: A method for manufacturing a flexible conductor 20 connected to a vertically movable upper conductor part passing a high current in a welding machine used as an electric apparatus treating a high current capable of melting metal comprises: the first step of bundling a plurality of metal plates 20a having flexibility and conductivity; the second step of dipping end portions on both sides of the bundled metal plates 20a into a solder tank; and the third step of permeating solder into a space between the metal plates 20a in the end portions dipped in the solder tank to press and fasten the end portions having the solder permeated into the space between the metal plates 20a.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a method of manufacturing a flexible conductor connected to a movable portion through which a large current flows, in an electric device that handles a large current such as a welder.

  2. Description of the Related Art Conventionally, a projection welder, for example, is an electrical device that handles a large current capable of melting metal. A large current flows between the welding transformer of the welding machine and the movable conductor portion (movable portion), and therefore, they are connected by a flexible conductor called an ounce copper plate. The flexible conductor is formed by stacking a plurality of thin flexible copper plates which are flexible and stretchable, flexible and conductive, and the end portions of the stacked copper plates are fixed to each other. That is, except for the both ends of the flexible conductor, it is not fixed, and since only a plurality of thin copper plates are overlapped, it is flexible and is stretchable by bending. If this flexible conductor is connected between the welding transformer and the movable conductor portion, the object to be welded can be welded by bringing the movable conductor portion close to the oppositely arranged fixed conductor portion.

  As a flexible conductor of this type, there are, for example, a connection conductor described in Patent Document 1 and a flexible conductor described in Patent Document 2. In the connection conductor of Patent Document 1, strip-shaped copper plates having a thickness of 30 μm to 50 μm and slightly different lengths are stacked, and pressure is applied while heating while sandwiching solder on terminal portions (ends) on both sides. After that, bolt holes are formed.

  The flexible conductor of Patent Document 2 covers the end portions on both sides of the stacked copper plates with a box-shaped metal terminal portion, and electrically and mechanically connects and fixes this terminal portion and fixes the terminals. It has a configuration in which a through hole is formed in the later terminal portion.

JP 2000-78715 A JP, 2010-167427, A

  However, since the connection conductor (flexible conductor) of the above-mentioned patent document 1 needs work of sandwiching solid solder in each gap of the end of a copper plate piled up at the time of manufacture, this work takes time and effort. I will. Also, since the solder is put in each gap, the end becomes thick, and when heating the end to melt the solder, much energy such as electricity is required to melt the solder in the middle in the thickness direction of the end. Do. That is, there is a problem that the manufacturing cost becomes high.

  However, as described above, when the solder in the middle of the end is heated to complete melting, the copper plate outside the end close to the heat source melts or degrades. Conversely, if heating is performed so that the copper plate outside the end does not melt or deteriorate, solder melting near the center of the end is insufficient, and the copper plates at the end can not be fixed properly. That is, there is a problem that each copper plate which becomes a terminal part of a connection conductor can not be fixed appropriately, or it can not form in a shape which has a plane required as a terminal part.

  The flexible conductor of the said patent document 2 covers the edge part of the both sides of the piled copper plate by a box-shaped terminal part, and electrically thermally mechanically connects and fixes this terminal part. In this fixing method, the outer peripheral portion of each copper plate and the terminal portion are fixed, but the copper plates in the terminal portion are not completely fixed. For this reason, a minute gap is formed between the copper plates, and this gap serves as a conductive resistance to generate heat, which causes a problem that the durability of the flexible conductor is lowered.

  This invention is made in view of such a situation, and can form the terminal part of the both sides of the flexible conductor which piled up a plurality of metal plates in the necessary shape which has a plane, and each metal plate of the terminal part An object of the present invention is to provide a method of manufacturing a flexible conductor which can be fixed together to improve the durability and reduce the manufacturing cost.

  As means for solving the above problems, the invention according to claim 1 is a method of manufacturing a flexible conductor connected to a movable portion of an electric device, comprising bundling a plurality of flexible and conductive metal plates. 1 step, a second step of immersing the end portion of the bundled metal plate in a solder bath, and a third step of extracting and solidifying the end portion which is extracted from the solder bath and in which the solder penetrates the gap between the metal plates. A method of manufacturing a flexible conductor comprising performing the steps of:

  According to this method, when a plurality of metal plates are bundled and the end portions on both sides are immersed in the solder bath, the solder penetrates into the gaps between the metal plates at the end portions by capillarity, so the solder adheres uniformly to the end portions Do. Since the end where the solder adheres to the gap between the metal plates is pressed and solidified, the end can be integrally fixed with the solder with a thickness substantially the same as the thickness of the bundled metal plates.

  For this reason, the front end side of the both sides which bundled the several metal plate can be easily formed in required shapes, such as a terminal part which has a plane. In addition, since the end portion to which the solder is uniformly attached is pressed and solidified in the gap between the metal plates on the tip side, the metal plates on the tip side can be integrally fixed without gaps. For this reason, since heat generation due to resistance due to a partial gap of the conventional terminal portion is eliminated, durability of the terminal portion can be improved. Furthermore, since the flexible conductor can be manufactured by a simple process of bundling a plurality of metal plates, dipping in a solder bath, and pressing and solidifying, the manufacturing cost can be reduced.

  In the invention according to claim 2, after bundling a plurality of metal plates in the first step, a jig is used in a state in which the tip end side protrudes by a predetermined length at both ends of the bundled metal plates. The method of manufacturing a flexible conductor according to claim 1, wherein the sandwiching and fixing step is performed.

  According to this method, the bundled metal plate on the tip end side is warped with the position sandwiched by the jig as the root. Therefore, a minute gap can be easily formed between the metal plates. In addition, since the jig serves as a mark for immersing the tip side of the bundled metal plates in the solder bath, if the solder is dipped to this mark, the tip can be easily dipped to an appropriate position. In addition, since the end portions of the bundled metal plates are firmly sandwiched, it is possible to stop the solder, which intrudes into the gap on the tip end side by capillary action, at the portion of the jig. For this reason, solder can be attached only to the portion to be a terminal portion.

  The invention according to claim 3 is characterized in that the step of applying an adjusting liquid for facilitating the adhesion of the solder to the surface is performed on the end before the end is dipped in the solder bath in the second step. It is a manufacturing method of the flexible conductor according to claim 1 or 2.

  According to this method, when the end is dipped in the solder bath in the second step, the solder can permeate into the gap of the end in a short time without unevenness by applying the adjusting liquid to the end.

  In the invention according to claim 4, after pressing and solidifying the end portion through which the solder has penetrated in the third step, the solder sticking out to the surface of the end portion hardened by the pressure and adhering to the surface The method of manufacturing a flexible conductor according to any one of claims 1 to 3, wherein the step of scraping off the solder is performed.

  According to this method, since the solder at the end is scraped off, it is possible to form a terminal having a smooth surface. Since this terminal portion has a smooth surface, it can be connected in a close state in which current easily flows, for example, to the connection surface between the movable conductor portion and the transformer as the power feeding movable portion of the electric device.

  The invention according to claim 5 is characterized in that, in the second step, one end of the bundled metal plates is immersed in a solder bath, and then in the third step, the one end immersed in the solder bath After the solder penetrates into the gap between the metal plates, a process of pressing and solidifying this one end is executed, and the flat surfaces of the one end fixed by the pressure and the other unfixed end are In the third step, the step of bending the bundled metal plates is performed so as to form the crossing angle, and after returning to the second step and immersing the other non-fixed end in the solder bath, After the solder penetrates into the gap between the metal plates at the other unfixed end immersed in the solder bath, a process of pressing and solidifying the other unfixed end is executed. It is a manufacturing method of the flexible conductor in any one of 1-4.

  According to this method, the flexible conductor is bent so that the terminal portions on both sides of the flexible conductor intersect each other. Here, assuming that the electric device according to claim 1 is, for example, a projection welder, the feeding movable portion through which a large current of the electric device flows is an upper conductor portion movable up and down with respect to the lower conductor portion on the fixed side. It comprises and comprises a welding transformer. The upper conductor portion and the welding transformer are generally arranged in a positional relationship mutually offset in the horizontal direction and the vertical direction. In this case, when electrically connecting the upper conductor portion and the welding transformer so as to withstand a large current, if the flexible conductor in the bent state is used, the terminal portions on both sides are deviated at an intersecting angle Therefore, the upper conductor portion and the welding transformer can be easily connected via the flexible conductor.

  The invention according to claim 6 uses a press that applies pressure by the upper pressing unit that moves up and down and the lower pressing unit on the fixed side in the third step, and heat insulation is performed on the lower pressing unit of the press. The flexible conductor according to any one of claims 1 to 5, wherein the end portion through which the solder penetrates is placed via a material, and the upper pressing portion is lowered to pressurize. It is a manufacturing method.

  According to this method, since the temperature of the end portion is less likely to be lowered by the heat insulating material, the solder that has permeated into the gap between the end portions is less likely to be solidified. For this reason, since the solder which has not yet solidified which has penetrated into the gap between the metal plates at the end portion is pressurized due to pressure, the solder between the metal plates stretches thinly, and all the metal plates are integrated with this stretched solder. It can be fixed.

  According to the present invention, the terminal portions on both sides of the flexible conductor in which a plurality of metal plates are stacked can be formed into a required shape having a flat surface, and the metal plates of the terminal portions are integrally fixed to improve durability. It is possible to provide a method of manufacturing a flexible conductor that can reduce the manufacturing cost.

It is a side view showing composition of a projection welding machine using a flexible conductor concerning an embodiment of the present invention. The to-be-welded object is shown, (a) A sectional view showing the 1st to-be-welded object and the 2nd to-be-welded object which a projection part protruded below, (b) It is a sectional view showing the state where a projection part was welded. It is a perspective view showing composition of a flexible conductor of this embodiment. It is a perspective view showing the state where a plurality of thin metal plates having flexibility and conductivity are stacked. It is a perspective view which shows the state which pinched | interposed the one end part of the overlapping metal plate by the jig | tool. It is sectional drawing which shows the state which attached the front end side to the solder tank from the jig | tool of a metal-laps metal plate. It is a side view which shows the state which pressurizes the front end side of the overlap metal plate which the solder | pewter penetrated with a press. It is a perspective view which shows the front end side of the overlapping metal plate after pressurization. It is a perspective view which shows the state which pinched | interposed the front end side of the overlapping metal plate after pressurization in vise.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a side view showing the configuration of a projection welder in which a flexible conductor according to an embodiment of the present invention is used.

  A projection welder (also referred to as a welder) 10 shown in FIG. 1 includes an upper conductor portion 11 and a lower conductor portion 12 which are disposed to face each other in the vertical direction in order to perform welding. The upper conductor portion 11 is movable up and down, and is electrically connected to a welding transformer 13 mounted inside the welding machine 10 by a flexible conductor 20 having flexibility and electrical conductivity which is flexible and flexible. It is done. When the upper conductor portion 11 moves up and down, the flexible conductor 20 bends and follows. The flexible conductor 20 has a flexibility that can be easily bent by a human hand. In addition, the welding transformer 13 comprises the electric power feeding part as described in a claim. The upper conductor portion 11 constitutes a movable portion described in the claims.

  The lower conductor portion 12 is fixed to the main body of the welding machine 10, and the workpiece 15 is mounted. As shown in FIG. 2A, the object to be welded 15 includes a first object to be welded 16 and a second object to be welded 17 which are objects to be welded, and the first object to be welded 16 is a second object to be welded The projection 17 has a projection 16 a that protrudes to the 17 side.

  In the welding machine 10, when the upper conductor 11 is moved downward and brought into contact with the first workpiece 16 placed on the lower conductor 12, a large current follows from the welding transformer 13 through the flexible conductor 20. It flows like. That is, a large current flowing through the flexible conductor 20 flows to the second workpiece 17 and the lower conductor 12 via the upper conductor 11 and the projection 16 a of the first workpiece 16. As a result, as shown in FIG. 2 (b), a large current flows through the projection 16a having a small contact area and is heated and melted, whereby the first workpiece 16 and the second workpiece 17 are joined. (Welding) 16b.

  The flexible conductor 20 which is the feature of the present embodiment is, as shown in FIG. 3, a stack (bundle) of a plurality of thin and thin metal plates 20a having flexibility and conductivity, and this stack (bundle) The metal plate 20a is bent in a "shape of a letter" in a side view. The bent end portions on both sides are fixed by soldering, and a hole 20c penetrating the terminal portion 20b is formed by this fixing. Each metal plate 20 a is formed by forming a conductive metal such as copper or an alloy into a flexible thin strip.

  When the metal plate 20a is a copper plate, the thickness is, for example, 0.1 mm to 0.25 mm. The terminal portion 20b of the flexible conductor 20 at this time is, for example, a copper plate of 0.1 mm, and 140 pieces of the copper plate are stacked and formed by the manufacturing method described later to have a thickness of 14 mm or more.

<Method of manufacturing flexible conductor>
Next, a method of manufacturing the flexible conductor 20 will be described with reference to FIGS.
As shown in FIG. 4, first of all, the metal plates 20a having slightly different lengths are used in the form of a rectangular solid (stacking) using a number of sheets or more that can stably supply a large current. When overlapping each metal plate 20a, one end surface is made flush. As a result, the other end face is in a state where the metal plates 20a having different lengths overlap in an inclined manner in a side view.

  Next, as shown in FIG. 5, a step of holding and fixing one end of the stacked metal plate 20 a with a jig 30 is performed. The stacked metal plate 20a is also referred to as a stacked metal plate 20a.

  The jig 30 includes two sets of a clamp 30a, a bolt 30b, and a nut 30c (see FIG. 6). The sandwiching portion 30a has a square bar shape, and a hole (not shown) penetrating at both ends thereof is opened. When the jig 30 is used, one end of the laminated metal plate 20a is sandwiched by the two sandwiching parts 30a from above and below, and after the bolts 30b are inserted into the holes at both ends of the sandwiching parts 30a, the nut 30c is screwed into the bolt 30b The end of the laminated metal plate 20a is fixed by clamping.

  However, the fixing of the laminated metal plate 20a by the jig 30 is performed at a position where the length of the portion from the jig 30 to the protruding end becomes a size suitable for the terminal portion 20b (FIG. 3). The portion of the stacked metal plate 20a that protrudes from the jig 30 is referred to as a tip 20e. The tip end of the tip end portion 20e is clamped from above and below by the square rod-like sandwiching portion 30a. For this reason, as shown by the arrow Y1, a minute gap is formed between the metal plates 20a, as shown by the arrow Y1, as the metal plates 20a on the tip end side of the tightening are opened up and down. In addition, the front-end | tip part 20e comprises the edge part as described in a claim.

  Next, a step of applying a solder paste (not shown) is performed to the tip portion 20e as an adjusting liquid for making the solder easily adhere to the surface. The solder paste contains a chemical substance having the property of dissolving the oxide film (corrosion) on the surface of the metal, and also contains substances such as soap, wax and vaseline which make the solder into a paste form.

  In the case of applying the solder paste, the tip portion 20e is dipped in an adjusting liquid tank (not shown) storing the solder paste. Since the tip 20e has a gap between the metal plates 20a, only by immersing the tip 20e in the solder paste, the solder paste penetrates into the gap without unevenness by capillary action. As a result, the solder paste adheres evenly to the tip 20e. In addition, you may implement methods, such as applying a solder paste, to the front-end | tip part 20e with the brush which attached the solder paste.

  Next, as shown in FIG. 6, the step of immersing the tip portion 20 e to which the solder paste is evenly applied into the molten solder 41 of the solder bath 42 is performed.

  The solder bath 42 can heat the inside like an electric furnace, and solid solder is melted by heat and stored as molten solder 41. Further, in the solder bath 42, two plate-like placement portions 42a are disposed apart from each other at the upper peripheral portion. Each mounting portion 42 a mounts the jig 30 fixed to the end of the stacked metal plate 20 a. While the mounting portions 42 a are separated, the opening 42 b is for inserting the tip 20 e into the molten solder 41. When the jig 30 is placed on the placement portion 42 a while inserting the tip portion 20 e into the opening 42 b, the tip portion 20 e is dipped in the molten solder 41. Since the tip portion 20e has the gap Y1 between the metal plates 20a, only by immersing the tip portion 20e in the molten solder 41 for a short time (for example, several seconds), the molten solder 41 uniformly penetrates the gap by capillary action.

  However, when the metal plate 20a is a metal which is easily melted by high heat such as a copper plate, the metal plate 20a is melted by heat if the immersion time is too long. Therefore, the immersion time in which the molten solder 41 penetrates evenly in the gaps of the tip 20e without melting the metal plate 20a is determined in advance by experiments, experience values, and the like.

  Next, after the immersion time has elapsed, the tip 20e is removed from the solder bath 42. Since the impurities on the surface of the molten solder 41 of the solder bath 42 adhere to the end portion 20e after the removal, the work of wiping with a rag or the like is performed.

  Next, as shown in FIG. 7, a step of pressing the tip portion 20 e to which the solder 41 a has been removed after the removal is performed by a press machine 50 is performed. The press machine 50 is configured to include an upper pressing portion 50a which can be moved up and down by a pressing piston 50c, and a lower pressing portion 50b which is disposed below the upper pressing portion 50a. A plate-shaped heat insulating material 51 is placed on the lower pressure portion 50b.

  When pressing the tip 20e, the tip 20e is placed on the heat insulating material 51 before the solder 41a attached to the tip 20e hardens, and the upper pressing portion 50a is lowered by the pressing piston 50c. The lowered upper pressure portion 50 a presses the tip portion 20 e with a predetermined pressure between the lower pressure portion 50 b and the lower pressure portion 50 b via the heat insulating material 51. At this time, since the temperature of the tip 20e is difficult to lower due to the heat insulating material 51, the solder that has permeated into the gap of the tip 20e is not yet solidified.

  Since the solder which is not yet solidified in the gap of the tip 20e is pressurized by the above pressure, as shown by the arrow Y2, the solder 41a protrudes on the end face of the tip 20e and the right and left sides. At the same time, the heat is drawn from the upper pressure portion 50a to the tip portion 20e to lower the temperature, so the solder solidifies. For this reason, each metal plate 20a of the front end portion 20e is fixed by solder and integrally fixed without a gap. The thickness of the end portion 20e after the fixing is substantially the same as the thickness obtained by overlapping the overlapping metal plates 20a without a gap. In addition, you may heat-retain by appropriate temperature so that the solder | pewter of the front-end | tip part 20e may not be rapidly cooled and solidified at the time of said pressurization.

  Next, the stacked metal plate 20a whose tip 20e is pressurized as described above is taken out from the press 50. As shown by the arrow Y3 in FIG. 8, the solder is extruded and solidified on the tip and the left and right surfaces of the tip 20e as shown by the arrow Y3 in FIG.

  For this reason, the step of removing the solder Y3 that has spilled out onto the surface of the tip 20e and the solder 41a that has adhered to the surface is carried out. As shown in FIG. 9, this removal is performed by holding the tip 20e with a vise 55 and polishing it with a sander. There are various methods for removing the solder, such as applying a file by hand.

  By the removal, the surface of one tip 20e of the laminated metal plate 20a becomes a smooth surface. As shown in FIG. 3, the terminal portion 20b is formed by carrying out the step of making the hole 20c in the smooth tip portion 20e.

  Next, the laminated metal plate 20a on which the terminal portion 20b is formed is placed on a mold (not shown) whose side surface shape is "a shape of a letter", and the middle of the laminated metal plate 20a is used as a mold Carry out the step of bending along.

  As shown in FIG. 3, the radius is different between the inner circumferential side and the outer circumferential side of the bent portion. Furthermore, in the bent state, it is an angle at which the plane of one of the terminal portions 20b and the plane of the other unfixed end portion intersect.

  In this way, in a state where the overlapping metal plate 20a is bent, the unfixed end portion whose end face protrudes in an inclined shape in a side view is loosely fixed with a jig 30 and the end face of the end portion is hit against a flat surface etc. Align to one. By making this flush, as shown in FIG. 4, the middle part in the longitudinal direction of the laminated metal plate 20 a is bent so that the radius is different between the inner peripheral side and the outer peripheral side. When the jig 30 is firmly tightened and fixed in a state where the end faces are flush with each other, the bent state of the laminated metal plate 20a is maintained.

  Next, the other end of the bent overlapping metal plate 20a is subjected to the same manufacturing process as above to complete the terminal portion 20b (FIG. 3). Thereby, the flexible conductor 20 shown in FIG. 3 is formed. However, the process of making the holes 20c of the terminal portions 20b on both sides may be performed at the very end.

  In the flexible conductor 20 formed by the above-described manufacturing method, the solder attached to the surface of the tip portion 20e to which the solder is fixed is scraped off with a sander or the like to form the terminal portion 20b. Therefore, fine solder remains on the surface of the terminal portion 20b. If this residual solder is enlarged and confirmed with a microscope or the like, it can be judged whether or not it is the flexible conductor 20 formed by the manufacturing method of the present embodiment.

<Effect of the embodiment>
As described above, in the method of manufacturing a flexible conductor according to the present embodiment, in the welding machine 10 as an electric device handling a large current capable of melting metal, the upper conductor portion 11 as a movable portion through which a large current flows The flexible conductor 20 to be connected is manufactured by a method having the following features.

  (1) a first step of bundling a plurality of flexible and conductive metal plates 20a, and a second step of immersing both ends (tips 20e) of the bundled metal plates 20a in a solder bath 42; A third step of pressing out and solidifying the end portion which is extracted from the solder bath 42 and the solder penetrates into the gap Y1 is performed.

  According to this method, when a plurality of metal plates 20a are bundled and the end portions on both sides are immersed in the solder bath 42, the solder penetrates into the gap Y1 between the metal plates 20a at the end portions by capillarity. Solder adheres evenly. Since the end where the solder adheres to the gap Y1 between the metal plates 20a is pressed and hardened, the end can be integrally fixed with the solder with a thickness substantially the same as the thickness of the bundled metal plates 20a.

  For this reason, it is possible to easily form the tip portions 20e on both sides of the plurality of metal plates 20a bundled into a required shape such as the terminal portion 20b having a flat surface. In addition, since the end portion to which the solder is uniformly attached is pressed and solidified in the gap Y1 between the metal plates 20a of the tip portion 20e, the metal plates 20a of the tip portion 20e can be integrally fixed without a gap. For this reason, since heat generation due to resistance due to a partial gap of the conventional terminal portion is eliminated, durability of the terminal portion 20b can be improved. Furthermore, since the flexible conductor can be manufactured by the simple steps of bundling the plurality of metal plates 20a, dipping in the solder bath 42, and pressing and solidifying, the manufacturing cost can be reduced. .

  (2) After bundling the plurality of metal plates 20a in the first step, the end portions on both sides of the bundled metal plates 20a are sandwiched and fixed by the jig 30 in a state where the tip end side protrudes a predetermined length I made it execute a step.

  According to this method, the bundled metal plates 20a of the tip 20e are warped with the position sandwiched by the jigs 30 as the root. Therefore, the minute gap Y1 can be easily formed between the metal plates 20a. In addition, since the jig 30 serves as a mark for immersing the tip portion 20e of the bundled metal plates 20a in the solder bath 42, the tip portion 20e can be easily dipped to an appropriate position. Further, since the end portions of the bundled metal plates 20a are firmly sandwiched, it is possible to stop the solder, which is intruding into the gap of the tip portion 20e by the capillary phenomenon, at the portion of the jig 30. For this reason, solder can be attached only to the portion to be the terminal portion 20b.

  (3) Before immersing the end portion in the solder bath 42 in the second step, the step of applying the adjustment liquid for facilitating the adhesion of the solder to the surface is performed at the end portion.

  According to this method, when the end portion is dipped in the solder bath 42 in the second step, the solder can penetrate the clearance Y1 of the end portion in a short time without unevenness by applying the adjusting liquid to the end portion. .

  (4) In the third step, after pressing and solidifying the end portion in which the solder has penetrated, a step of scraping off the solder sticking out to the surface of the hardened end portion and the solder adhering to the surface is executed. did.

  According to this method, since the solder at the end is scraped off, it is possible to form the terminal portion 20b having a smooth surface. Since the terminal portion 20b has a smooth surface, when connecting the terminal portion 20b to each connecting surface of the upper conductor portion 11 of the welding machine 10 and the welding transformer 13, it is possible to connect in a close state where current easily flows it can.

  (5) In the second step, after one end of the bundled metal plates 20a is immersed in the solder bath 42, in the third step, the gap between the metal plates 20a at one end immersed in the solder bath 42 After the solder penetrates Y1, a process of pressing and solidifying this one end is performed. Thereafter, a step of bending the bundled metal plates 20a is performed so that the flat surfaces of the solidified one end and the other unfixed end intersect with each other. Further, returning to the second step, after the other unfixed end of the bent metal plate 20a is dipped in the solder bath 42, the other unfixed end dipped in the solder bath 42 in the third step After the solder penetrates into the gaps between the metal plates 20a, the other unfixed end is pressed and hardened.

  According to this method, the flexible conductor 20 is configured to be bent such that the terminal portions 20b on both sides of the flexible conductor 20 intersect each other. The upper conductor portion 11 of the welding machine 10 and the welding transformer 13 are generally arranged in a positional relationship in which they are mutually offset in the horizontal direction and the vertical direction. In this case, when the upper conductor portion 11 and the welding transformer 13 are electrically connected to withstand a large current, if the flexible conductor 20 in the bent state is used, the angle at which the terminal portions 20b on both sides cross each other Because of the misalignment, the upper conductor portion 11 and the welding transformer 13 can be easily connected via the flexible conductor 20.

  (6) In the third step, using the press 50 pressurized by the upper pressing unit 50a moving up and down and the lower pressing unit 50b on the fixed side, a heat insulating material is placed on the lower pressing unit 50b of the press 50 The end portion in which the above-mentioned solder penetrated was placed via 51, and the upper pressure portion 50a was lowered and pressurized.

  According to this method, the temperature of the end portion is less likely to be lowered by the heat insulating material 51, so that the solder that has permeated into the gap between the end portions is less likely to be solidified. For this reason, since the unhardened solder which has penetrated into the gap between the metal plates 20a at the end portion is pressurized due to the pressure, the solder between the metal plates 20a is thinly elongated, and all the metal plates 20a are stretched by this elongated solder. Can be fixed together.

  In addition, about a specific structure, it can change suitably in the range which does not deviate from the main point of this invention. As shown in FIG. 3, the flexible conductor 20 is described as being bent in a “figure-like shape” in a side view using a mold having a “figure-like shape” in a side view. It may be another shape such as a letter shape or a straight shape.

DESCRIPTION OF REFERENCE NUMERALS 10 projection welding machine 11 upper conductor portion 12 lower conductor portion 13 welding transformer 15 to-be-welded object 16 first to-be-welded object 17 second to-be-welded object 16 a protrusion 20 flexible conductor 20 a metal plate 20 b terminal portion 20 c hole 20e terminal Part 30 Jig 30a Clamping part 30b Bolt 30c Nut 41 Molten solder 42 Solder bath 42a Mounting part 42b Opening 50 Press machine 50a Upper pressure part 50b Lower pressure part 50c Pressure piston 51 Heat insulation material 55 Force

Claims (6)

In a method of manufacturing a flexible conductor connected to a movable part of an electrical device,
A first step of bundling a plurality of flexible and conductive metal plates;
A second step of immersing the end portion of the bundled metal plate in a solder bath;
And a third step of pressing and solidifying the end portion which is extracted from the solder bath and in which the solder penetrates into the gap between the metal plates. After bundling a plurality of metal plates in the first step,
The flexible conductor according to claim 1, wherein the step of clamping and fixing the end portions on both sides of the bundled metal plate with a jig in a state in which the tip end side protrudes a predetermined length is performed. Manufacturing method. The method according to claim 1 or 2, further comprising the step of applying an adjusting liquid to the end to make it easy for the solder to adhere to the surface before the end is dipped in the solder bath in the second step. Method of producing a flexible conductor. After pressing and solidifying the end portion where the solder penetrated in the third step,
The method according to any one of claims 1 to 3, wherein the step of scraping off the solder that has spilled out onto the surface of the end portion hardened by pressure and the solder that has adhered to the surface is performed. Method of manufacturing a conductor After immersing one end of the bundled metal plate in a solder bath in the second step,
In the third step, after the solder penetrates into the gap between the metal plates at one end immersed in the solder tank, a process of pressing and solidifying the one end is executed.
Performing the step of bending the bundled metal plates such that the planes of one end hardened by the pressure and the other unfixed end intersect each other;
Returning to the second step, after immersing the other unfixed end in the solder bath,
In the third step, after the solder penetrates into the gap between the metal plates at the other unfixed end immersed in the solder bath, a process of pressing and solidifying the other unfixed end is executed. The manufacturing method of the flexible conductor as described in any one of the Claims 1-4 characterized by the above-mentioned. In the third step, using a press that applies pressure by the upper pressing part that moves up and down and the lower pressing part on the fixed side, solder permeates through the heat insulating material on the lower pressing part of the press. The method for manufacturing a flexible conductor according to any one of claims 1 to 5, wherein the end portion is placed, and the upper pressing portion is lowered to pressurize.

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