JP2017098161A - Joining method of flat wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase joint intensity of a flat wire.SOLUTION: A joining method of a flat wire comprises: a step of forming a peeing part 45a between an end surface 43a of an end part 42a and a non-peeling part 46a by peeling a coating film 41a from a side surface of the end part 42a of the flat wire covered with the coating film 41a; a step of arranging the end surfaces of end parts of a pair of flat wires in the same direction, and contacting both peeling parts while making both side surfaces of the peeling part face each other; and a step of projecting an energy to the peeling part from the side of the end surface, and welding both peeling parts. In the step of forming the peeling part 45a, when an extension coating film 48a extending toward the peeling part 45a from the non-peeling part 46a is left by obliquely cutting the coating film 41a, a smooth connection part 40a is formed between the side surface of the peeling part 45a and the side surface of the non-peeling part 46a is formed, and the side surfaces of the peeling part connected to the connection part are made to face each other in the step of contacting both peeling parts.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a method for joining rectangular wires.

  Patent Document 1 discloses a method for joining rectangular wires. In this method, as shown in FIG. 1, the peeling portions 35a and 35b are formed by peeling off the insulating film on the side surface of the flat wire. Further, the side surfaces of the peeling portions 35a, b are brought into contact with each other. Then, the laser beam 34 is irradiated to the end surfaces 33a and 33b at the ends of the flat wire.

JP 2013-109948 A

  In the above bonding method, as shown in FIG. 2, steps 31a and 31b are formed between the peeling portions 35a and 35b and the non-peeling portions 36a and 36b where the insulating film is not peeled off. For this reason, as shown in FIG. Further, the bonding area between the peeling portions 35a and 35b is narrow. Therefore, it is difficult to increase the bonding strength between the peeling portions 35a and 35b. Such a problem is not limited to bonding by a laser beam. An object of the present invention is to make it easy to increase the strength of bonding of flat wires.

  It is the joining method of the flat wire of 1 aspect of this invention. In one step of the method, the insulating film is peeled off from the side surface of the end portion of the flat wire covered with the insulating film to form a peeling portion between the end surface of the end portion and the non-peeling portion.

  In another step, the end surfaces of the ends of the pair of flat wires are aligned in the same direction. Furthermore, after making the side surfaces of the peeling portions face each other, the peeling portions are brought into contact with each other. In another step, energy is projected from the end face side to the peeling portion to weld the peeling portions together.

  In the step of forming the peeling portion, the insulating film is cut obliquely. This leaves an insulating film extending from the non-peeling portion toward the peeling portion. Thereby, a smooth joint is formed between the side surface of the peeling portion and the side surface of the non-peeling portion. In the step of bringing the peeling portions into contact with each other, the side surfaces of the peeling portions connected to the joint are opposed to each other.

  By this invention, it becomes easy to raise the intensity | strength of joining of a flat wire.

It is a figure which shows a joining apparatus and a flat wire pair. It is a figure which shows the joint of the peeling part of a prior art, and a non-peeling part. It is a figure which shows the welding of a prior art. It is a figure which shows formation of the peeling part of embodiment. It is a figure which shows the blade of embodiment. It is a figure which shows formation of the mating surface of embodiment. It is a figure which shows contact | abutting of the peeling parts of embodiment. It is a figure which shows welding of the peeling parts of embodiment. It is a figure which shows laser welding. It is a figure which shows the pair of peeling part. It is a perspective view which shows the usage of a clamp jig | tool. It is an enlarged plan view (upper stage) and an enlarged front view (lower stage) of the clamp jig. It is a perspective view which shows the usage of a clamp jig | tool. It is an enlarged plan view (upper stage) and an enlarged front view (lower stage) of the clamp jig. It is a perspective view which shows the usage of a clamp jig | tool. It is an enlarged plan view (upper stage) and an enlarged front view (lower stage) of the clamp jig. It is a perspective view which shows the usage of a clamp jig | tool. It is an enlarged plan view (upper stage) and an enlarged front view (lower stage) of the clamp jig. It is a perspective view which shows the usage of a clamp jig | tool. It is an enlarged plan view (upper stage) and an enlarged front view (lower stage) of the clamp jig. It is a perspective view which shows the usage of a clamp jig | tool. It is an enlarged plan view (upper stage) and an enlarged front view (lower stage) of the clamp jig. It is a perspective view which shows the usage of a clamp jig | tool. It is an enlarged plan view (upper stage) and an enlarged front view (lower stage) of the clamp jig.

  A method for joining rectangular wires according to this embodiment will be described. In FIG. 4, the upper stage shows a plan view of the end portion of the flat wire. The lower part shows the front view. The same applies to the following drawings. The flat wire includes a conductor portion 47a made of copper or other metal and a coating 41a covering the conductor portion 47a. The film 41a is an insulating film made of enamel or other insulator.

  As shown in FIG. 4, the flat wire end portion 42a is processed to form a peeling portion 45a. Specifically, the film 41a is peeled from the side surface of the end 42a covered with the film 41a. Of the end portion 42a, a non-peeling portion 46a from which the coating film 41a is not peeled is left. A peeling portion 45a is formed between the end surface 43a of the end portion 42a and the non-peeling portion 46a. The peeling part 45a contacts the end face 43a. The peeling part 45a is connected to the end face 43a.

  As shown in FIG. 4, the extended film 48a is left by further cutting the film 41a obliquely. The extended coating 48a extends from the main part of the non-peeling part 46a toward the peeling part 45a. The extended coating 48a constitutes a part of the non-peeling portion 46a. A smooth joint 40a is formed at the end portion 42a between the side surface of the peeling portion 45a and the side surface of the non-peeling portion 46a.

  FIG. 5 shows a blade 51 as an example of a tool for forming the peeling portion. The flat wire 52 before cutting and forming the end portion is cut with the blade 51. The cutting tool 51 includes blade end portions 53a and 53b and groove-shaped portions 54a and 54b. Here, the groove-shaped portion refers to a portion having a cutting tool shape for cutting a flat wire and obliquely cutting a flat wire film.

  As shown in FIG. 5, the blade end portions 53a and 53b are located at both ends of the blade. The groove-like portions 54a and 54b are concave portions that are dug obliquely from the blade end portions 53a and 53b, respectively. The cutting tool 51 divides the flat wire 52 into a groove-like portion 54a side and a groove-like portion 54b side. An end face 43a of the end portion 42a is formed by the division.

  Simultaneously with the cutting of the flat wire, the blade end portions 53a and 53b shown in FIG. 5 cut the flat wire at right angles to the long direction of the flat wire. The groove portions 54a and 54b cut a part of the film obliquely as described above. When cutting the flat wire, the upper end of the conductor portion 47a shown in FIG. 4 may also be cut obliquely in the same manner as the coating 41a. You may cut | disconnect the conductor part 47a and the membrane | film | coat 41a simultaneously.

  The inner surface of the groove-like portion 54a shown in FIG. 5 is smooth, which is suitable for forming the smooth joint 40a shown in FIG. Further, as shown in FIG. 4, a notch 44a may be formed on the opposite side of the extended film 48a with respect to the conductor portion 47a.

  A mating surface 50a is formed as shown in FIG. The mating surface 50a includes a side surface of the peeling portion 45a and a side surface of the non-peeling portion 46a including the surface of the extended coating 48a. The peeling portion 45a is bent to form a flat mating surface 50a. The mating surface 50a may include an obliquely cut surface of the peeling portion 45a.

  As shown in FIG. 7, the peeling portions are brought into contact with each other. In the drawing, in addition to the end portion of the flat wire provided with the peeling portion 45a and the extended coating 48a, the end portion of the flat wire provided with the peeling portion 45b and the extended coating 46b equivalent to these and other components are shown. Yes.

  As shown in FIG. 7, first, these rectangular wires are paired. In addition, the orientations of the end faces of the ends of the pair of flat wires are aligned in the same direction. These end faces 43a and 43b are located above the peeling portions 45a and 45b in the lower front view.

  As shown in FIG. 7, the side surfaces of the peeling portions 45a and 45b are opposed to each other. That is, the side surfaces connected to the smooth joints 40a and 40b are opposed to each other in a pair of flat wires. The mating surfaces 50a and 50b are preferably brought into contact with each other in a pair of flat wires.

  As shown in FIG. 8, the peeling portions 45a and 45b are welded together. Energy is projected and welded to the peeling portions 45a and 45b from the end surfaces 43a and 43b. For example, laser welding may be performed using the laser beam 34. Further, arc welding may be performed. Arc welding may be TIG (tungsten-inert gas) welding.

  As shown in FIG. 7, in the method of this embodiment, the mating surfaces 50a and 50b are in close contact with each other. For this reason, the conductors of the peeling portions 45a and 45b are fused with each other at the mating surfaces 50a and 50b and are strongly bonded.

  As shown in FIG. 3, in the conventional method, a part of the laser beam 34 enters the gap 32 as intrusion light 38. The intrusion light 38 is projected onto the insulating film of the non-peeling portions 36a and 36b. For this reason, damage 39 of the film occurs.

  As shown in FIG. 7, in the method of this embodiment, smooth joints 40a, 40b are formed instead of the steps 31a, 31b shown in FIG. For this reason, when peeling part 45a, b contact | abuts, it is hard to produce a clearance gap. For this reason, as shown in FIG. 8, the laser beam 34 hardly reaches the non-peeled portions 46a and 46b. For this reason, damage to the film is difficult to occur.

  Note that the present invention is not limited to the above-described embodiment, and can be changed as appropriate without departing from the spirit of the present invention. For example, as shown in FIG. 9 showing laser welding, two laser beams 61a and 61b may be used.

  As shown in FIG. 9, the end surface 43a is irradiated with the laser beam 61a, and the end surface 43a is not irradiated with the laser beam 61b. The end surface 43b is irradiated with the laser beam 61b, and the end surface 43b is not irradiated with the laser beam 61a.

  As shown in FIG. 9, the laser beams 61a and 61b irradiate near the mating surfaces 50a and 50b, respectively. Laser beams 61a and 61b form molten pools 62a and 62b, respectively. The molten pools 62a and 62b expand and melt together. For this reason, peeling part 45a, b is joined.

  As shown in FIG. 9, the laser beams 61a and 61b are not irradiated between the mating surfaces 50a and 50b. For this reason, the laser beams 61a and 61b do not enter between the peeling portions 45a and 45b. Therefore, damage to the insulating film can be further prevented.

  In the prior art, as shown in FIG. 3, the peeling portions 35a and 35b are pressed by the clamp jigs 37a and 37b and fixed to each other. In the present embodiment, a pair of peeling portions may be fixed similarly. Moreover, you may fix a some peeling part collectively with another clamp jig | tool as shown to FIGS.

  FIG. 10 shows the peeling part pair 65a-d and the non-peeling part pair 66a-d. In the peeling portion pair 65a-d, each peeling portion is paired with the butting surface 67a-d interposed therebetween. Each peeling part of the peeling part pair 65a-d has an individual rectangular wire. Further, similarly to the end portions of the rectangular wires shown in FIG.

  In the peeling portion pair 65a-d shown in FIG. 10, the individual rectangular wires are connected by joining the peeling portions to each other. Accordingly, the flat wire becomes a coil after joining. By using this method, a coil can be created even with a rectangular wire that is difficult to deform. Such a coil is suitable for a stator coil, for example.

  As shown in FIG. 11, the peeling portion pair 65 a is inserted into the hole 73 of the reference side jig 72. As shown in FIG. 12, the insertion depth may be about half of the height of the peeling portion pair 65a. The peeling portion pair 65b-d shown in FIG. 11 is handled in the same manner as the peeling portion pair 65a. The same applies to the following steps. The hole 73 is a square, and one of the corners of the hole 73 is provided with a carrier 74.

  As shown in FIG. 13, the carrying part 74 is moved in the direction of the peeling part pair 65a. As shown in FIG. 14, the carrying part 74 is pressed against the peeling part pair 65a. Positioning between the peeling portion pair 65 a and the reference side jig 72 is performed by the carrying portion 74.

  As shown in FIG. 15, the peeling portion pair 65 a is inserted deeper into the hole 73. As shown in FIG. 16, the reference-side jig 72 is hooked on the step 68a formed between the peeling portion of the peeling portion pair 65a and the non-peeling portion of the non-peeling portion pair 66a, that is, the cut surface of the film. Alternatively, the lower jig may be hooked on the notches 44a and 44b shown in FIG. This eliminates the shift in the height direction of the peeling portion in the peeling portion pair 65a.

  As shown in FIG. 17, the pressure side jig 76 is overlapped with the reference side jig 72. The peeling portion pair 65 a is inserted into the hole 77 of the pressing side jig 76. As shown in FIG. 18, the insertion depth may be half or less of the length of the hole 77. At this time, a corner 78 which is one of the corners of the hole 77 is located on the opposite side of the carrying portion 74 with the peeling portion pair 65a interposed therebetween.

  As shown in FIG. 19, the pressure side jig 76 is moved in the lateral direction. That is, as shown in FIG. 20, the hole 77 is brought close to the carrying part 74, and the peeling part pair 65 a is sandwiched between the hole 77 and the carrying part 74. Positioning between the peeling portion pair 65 a and the pressure side jig 76 is performed by the hole 77. Such positioning is positioning in a direction parallel to the butting surface 67a.

  As shown in FIG. 21, the peeling portion pair 65 a is inserted deeper into the hole 77. Thereby, as shown in FIG. 22, the reference | standard side jig | tool 72 and the pressurization side jig | tool 76 are stuck. Further, as shown in FIG. 23, the pressing side jig 76 is moved in the lateral direction. As shown in FIG. 24, by bringing the hole 77 close to the carrying portion 74, the peeling portion pair 65a is pressed in a direction perpendicular to the abutting surface 67a. The gap between the peeling portions generated in the butt surface 67a is filled.

  As shown in FIG. 24, the reference side jig 72 and the pressure side jig 76 are in close contact with each other around the peeling portion pair 65a, and there is no gap. For this reason, the energy projected for welding does not reach not only the abutting surface 67a but also the periphery of the peeling portion pair 65a. For this reason, the film | membrane of the non-peeling part of the non-peeling part pair 66a shown in FIG. 10 can be protected.

31a, b step, 32 gap, 33a, b end face, 34 laser beam, 35a, b peeling part, 36a, b non-peeling part, 37a, b clamp jig, 38 intrusion light, 39 damage, 40a, b joint, 41a coating, 42a end, 43a, b end face, 44a, b notch, 45a, b peeling part, 46a, b non-peeling part, 47a conductor part, 48a, b extended coating, 50a, b mating face, 51 cutting tool , 52 rectangular wire, 53a, b blade edge, 54a, b groove, 61a, b laser beam, 62a, b molten pool, 65a-d peeling part pair, 66a-d non-peeling part pair, 67a-d Surface, 68a step, 72 reference side jig, 73 holes, 74 carrying part, 76 pressurization Side jig, 77 holes, 78 angles

Claims (1)

Peeling the insulating film from the side surface of the end portion of the flat wire covered with the insulating film to form a peeling portion between the end surface of the end portion and the non-peeling portion;
While aligning the direction of the end face of each end of the pair of flat wires in the same direction, and making the side surfaces of the peeled portions face each other, bringing the peeled portions into contact with each other;
And projecting energy from the end face side to the peeled portion to weld the peeled portions together,
In the step of forming the peeling portion, by cutting the insulating film obliquely, leaving an insulating film extending from the non-peeling portion toward the peeling portion, the side surface and the non-side of the peeling portion Form a smooth seam between the side of the peeling part,
In the step of bringing the peeling portions into contact with each other, the side surfaces of the peeling portions connected to the joint are opposed to each other.
Flat wire joining method.

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