JP4674075B2 - Wire joining method - Google Patents

Description

  The present invention relates to a connection electric wire constituted by intersecting two electric wires and joining them by an ultrasonic welding method, and an electric wire joining method by an ultrasonic welding method for obtaining a connection electric wire.

  6 (a) and 6 (b) show an embodiment of a conventional ultrasonic welding horn (see, for example, Patent Document 1).

  The ultrasonic welding horn 81 is for performing ultrasonic welding by sandwiching a metal plate 84 and a core wire 85a of an end of an electric wire 85 between a horn chip 83 and an anvil 82. A V-groove holding portion 83a for receiving the core wire 85a is recessed in the lower surface of the horn chip 83. Moreover, the continuous uneven | corrugated | grooved part 86 is formed in the horizontal opposing surface 83d (FIG.6 (b)) with the anvil 82 in the side wall part 83c of the both sides of the holding | maintenance part 83a. The concave portion of the concavo-convex portion 86 acts as a relief space 86d for receiving the protruding core wire.

  FIGS. 7A and 7B show one form of a conventional ultrasonic bonding method for electric wires (see, for example, Patent Document 2).

The electric wires 95 and 96 are crossed with each other, the crossing portion 97 is set in a pressurized state between the horn-side tip 91 and the anvil-side tip 92, and ultrasonic vibration is input to the crossing portion 97 so that the electric wire 95 96 are joined. The electric wires 95, 96 are inclined at an angle of 45 ° or in the vicinity of this angle with respect to the vibration direction 90X of the ultrasonic vibration, and the electric wires 95, 96 are set between the horn-side tip 91 and the anvil-side tip 92. .
JP 2000-206422 (page 1-2, FIGS. 1 and 3) JP 2002-280139 A (page 1-2, FIG. 1-2)

  However, in the conventional ultrasonic welding horn 81 shown in FIGS. 6 (a) and 6 (b), when a single wire such as copper is joined at a right angle or an arbitrary angle by an ultrasonic welding method, the cross section is substantially omitted. Since the circular electric wires are in contact with each other, there is a concern that the positional deviation of the electric wires is likely to occur, the welding strength is low and unstable (the variation becomes large). In addition, although the positioning between the horn tip 83 that is an electric wire holder and the electric wire is tightened, positioning becomes easier to some extent, but for this reason, workability for performing ultrasonic welding is lowered.

  Further, even in the conventional ultrasonic bonding method for electric wires shown in FIGS. 7 (a) and 7 (b), the electric wires 95 and 96 are likely to be displaced when ultrasonic bonding is performed, and the welding strength is low. And there was concern that it was not stable.

In view of the above points, the present invention prevents the occurrence of positional deviation between wires when joining the wires, and has high welding strength and little variation in welding strength. It aims at providing the joining method of the electric wire for obtaining .

In order to achieve the above object, a method for joining electric wires according to claim 1 of the present invention includes a metal wire having one circular cross section and a metal member having a circular cross section perpendicular to the one electric wire. In the joining method of the electric wire to join the electric wire by ultrasonic vibration while pressing between the tip for the ultrasonic welding horn and the anvil, the tip for the ultrasonic welding horn and the anvil each have four inclined surfaces. A plurality of substantially quadrangular pyramid-shaped convex portions arranged in parallel in the XY direction, and a substantially V-groove concave portion in the XY direction formed by the inclined surfaces facing the adjacent convex portions, the XY The one electric wire is arranged along any one of the concave portions in the direction, the other electric wire is arranged along any one of the other concave portions in the XY direction, and both the concave portions are arranged at the intersecting portions of both the electric wires. Ultrasonic welding is performed with the intersections of the Accordingly, one protrusion along the longitudinal direction of the electric wire is transferred and formed at the center in the radial direction of the one electric wire, and the other protrusion along the longitudinal direction of the electric wire at the center in the radial direction of the other electric wire is formed by the other recess. Is transferred and formed .

With the above configuration, when one electric wire and the other electric wire are joined to form a connection electric wire, an uneven knurl pattern of the ultrasonic welding tip is formed along the longitudinal direction of each electric wire. In addition, one electric wire and the other electric wire are arranged to cross each other and ultrasonic welding is performed, and the uneven knurl of the ultrasonic welding tip bites into the surface of each electric wire so that one electric wire and the other electric wire are wire mutual positional deviation when it is joined (positional deviation of each electric wire for ultrasonic welding tip) is prevented. In particular, one wire and the other wire and is Mari included fitted uneven knurls recess of ultrasonic welding tip on and intersecting, ultrasonic welding is performed in a state of being positioned stably. Each projection is formed on each wire portion into the recesses (grooves) of the knurl. Projecting portion of the wire is formed by a recess of the chip ultrasonic welding. The concavo-convex knurl is an XY direction formed by a substantially quadrangular pyramid-shaped convex portion having four inclined surfaces and arranged in parallel in the XY direction, and an inclined surface opposed to the adjacent convex portion. Is a substantially V-groove-shaped recess.

It is arranged one of the wires along one groove provided in a concave convex knurls, along the other groove provided uneven knurls by arranging the other wires, both wires each groove Since the position is stably positioned and ultrasonic welding is performed in this state, a positional deviation when joining one electric wire and the other electric wire is reliably prevented.

In addition, at the intersection of one electric wire and the other electric wire that is substantially orthogonal to one electric wire, that is, the portion to be welded, the intersection of one groove of the knurl and the other groove substantially orthogonal to the one groove When the ultrasonic welding is performed, the intersecting portion between one electric wire and the other electric wire is accommodated in the intersecting portion between one groove and the other groove of the knurl and is positioned accurately. Thereby, when performing ultrasonic welding, the positional deviation of the electric wire in the crossing part of one electric wire and the other electric wire becomes very unlikely to occur.

Further, the one electric wire and the other electric wire intersecting with the one electric wire are guided by the respective inclined surfaces and smoothly and surely fitted into the concavo-convex knurl, and are stably positioned in the substantially V-groove-shaped recess. Thereby, the position shift with one electric wire and the other electric wire is prevented more reliably at the time of ultrasonic welding.

  As described above, according to the first aspect of the present invention, since the displacement when one electric wire and the other electric wire are joined is prevented, the welding strength is high and the connection with good welding quality is stable. Electric wires can be provided. In particular, since the ultrasonic welding is performed in a state where the wires are crossed and fitted into the concave and convex knurls of the ultrasonic welding tip and stably positioned, the welding strength is higher and the welding is performed. It is possible to provide a connection wire with better welding quality that has less variation in strength and is more stable.

In addition, since each wire is fitted in each groove of the ultrasonic welding tip in a crossed state and ultrasonic welding is performed in a state where the crossing portion of both wires is accurately positioned, the welding strength is increased and welding is performed. Stable and good welding quality can be obtained while suppressing variations in strength. In addition, by lowering the ultrasonic welding tip toward the electric wire, each electric wire automatically fits in each groove of the ultrasonic welding tip and is positioned accurately, so the electric wire setting work is easy. , Welding workability and work efficiency are improved.

In addition, when performing ultrasonic welding, the position of the intersection of one electric wire and the other electric wire is accurately defined, so that the welding strength is further increased and the variation in the welding strength is further reduced, which is even better. Welding quality can be obtained.

Further , since each electric wire is centered in the V-groove-shaped recess and positioned stably and accurately during ultrasonic welding, the welding strength is further increased and the variation in the welding strength is further reduced, which is further improved. Welding quality can be obtained. Moreover, since each electric wire is smoothly fitted into the V-groove-shaped recess along the inclined surface, the electric wire setting work is further facilitated, and the welding workability and work efficiency are further improved.

  Embodiments of a connecting wire and a method for joining wires according to the present invention will be described below in detail with reference to the drawings.

  Fig.1 (a) is a top view which shows the 1st Example of the joining method of the connection electric wire which concerns on this invention, and an electric wire, FIG.2 (a) shows the 1st Example of the joining method of a connection electric wire and an electric wire similarly. FIG. 3A is a side view showing the first embodiment of the connecting wire and the method for joining the wires.

  As shown in FIG. 1 (a) and FIG. 2 (a), one electric wire 10 and the other electric wire 20 intersecting in a state substantially orthogonal to the one electric wire 10 are joined by an ultrasonic welding method. A connecting wire 1 is configured. Each of the electric wires 10 and 20 is formed as a single wire having a diameter of 0.8 mm, for example, and is joined to each other based on an ultrasonic welding method.

  Briefly describing the ultrasonic welding, high-frequency (ultrasonic) vibration is applied to the joined portions, whereby metal atoms are diffused and further recrystallized, whereby mechanical joining is performed. Ultrasonic welding eliminates the need for silver brazing, solder, flux, etc. used in other welding methods. Moreover, since energy consumption is less than other welding methods, energy saving can be achieved.

  Each of the electric wires 10 and 20 is a single wire formed as a bare electric wire. Each of the electric wires 10 and 20 is a conductor using a soft metal material such as copper, and as the material of the electric wire, various metal materials that can be ultrasonically welded such as copper and aluminum can be used.

  The ultrasonic welding horn tip 30 (FIGS. 2 (a) and 3 (a)) shown in FIGS. 1 (a), 2 (a), and 3 (a), and the anvil tip side The electric wires 20 (FIGS. 1A and 2A) are the electric wires 10 and 20 of the same type and the same size. Thus, in FIG. 1 (a) and FIG. 2 (a), what joins the same kind and the same size electric wires 10 and 20 is illustrated, but one electric wire 10 and the other electric wire 20 are connected. You may form with a different kind of metal material.

  Further, the diameter 10D of the one electric wire 10 and the diameter 20D of the other electric wire 20 may be slightly different. In such a case, the joining conditions of the electric wires change somewhat. The difference between the diameter 10D of the one electric wire 10 and the diameter 20D of the other electric wire 20 is within a range where both the electric wires 10 and 20 can be joined.

For ultrasonic welding, an ultrasonic welding horn tip 30 shown in FIGS. 2A and 3A is used. The ultrasonic welding horn tip 30 is provided with an uneven portion 35 called a knurl 35. A knurl means the thing of fine ridge shape, such as the substantially uneven | corrugated shape provided in the surface, for example. As shown in the plan view of FIG. 2A, a substantially square knurl pattern 35 </ b> P is formed in parallel on the wire pressing surface 30 a side of the ultrasonic welding tip 30. Wire press contact surface 30 a is a top surface of the mountain-shaped convex portion 34.

  On the side of the wire pressing surface 30 a of the ultrasonic welding horn tip 30, approximately one V-shaped recess 31 is arranged in parallel at approximately equal intervals, and approximately V-groove substantially orthogonal to each recess 31. The other recesses 32 are arranged in parallel at substantially equal intervals, and the interval 31S between the one recesses 31 and the interval 32S between the other recesses 32 are substantially equal to each other in plan view of FIG. A substantially square knurl pattern 35 </ b> P is arranged in parallel on the wire pressing surface 30 a side of the ultrasonic welding horn tip 30. The interval 31 </ b> S is defined at the bottom of the recess 31.

  Each one of the substantially V-shaped concave portions 31 is provided so as to be substantially parallel to one end portion 30s of the ultrasonic welding horn tip 30. Further, each other concave portion 32 having a substantially V-groove shape is provided so as to be substantially parallel to the other end 30t of the ultrasonic welding horn tip 30. Each one of the substantially V-groove-shaped recesses 31 and each of the other substantially V-groove-shaped recesses 32 are formed by profile polishing. The other end 30t is positioned along a direction substantially orthogonal to the one end 30s of the ultrasonic welding horn tip 30, and the horn tip 30 is substantially rectangular in a plan view of FIG. It is a pressing piece.

  In a plan view of the ultrasonic welding horn tip 30 as viewed from the wire pressing surface 30 a side, the knurl pattern 35 </ b> P of the ultrasonic welding horn tip 30 has an angle of 0 ° with respect to the electric wire 10, and at the center of the tip 30. There is no center convex part.

  As shown in FIG. 1A, after ultrasonic welding is performed, the concavo-convex knurl pattern of the ultrasonic welding horn tip 30 (FIG. 2A) is formed along the direction in which one electric wire 10 is extended. 35P is transferred to one electric wire 10 (FIG. 1A). Moreover, the uneven | corrugated knurl pattern 35P of the tip 30 for ultrasonic welding horns (FIG. 2 (a)) is transcribe | transferred to the other electric wire 20 along the direction where the other electric wire 20 is extended (FIG. 1 (a). )).

  The knurled pattern 35P of the ultrasonic welding horn tip 30 (FIG. 2 (a)) is arranged in the direction in which the electric wire 10 or 20 is extended, that is, in the direction substantially parallel to the electric wire 10 or 20, respectively. Each knurl 35 is disposed on the ultrasonic welding horn tip 30 so as to be transferred to 20.

  In the intersection 6A between one electric wire 10 and the other electric wire 20 joined to one electric wire 10, either the one electric wire 10 or the other electric wire 20 or both of the electric wires 10, 20 are extended. Then, the concavo-convex knurl pattern 35P of the ultrasonic welding horn tip 30 (FIG. 2A) is transferred to the electric wires 10 and 20 (FIG. 1A).

  The connecting wire 1 is configured by joining one electric wire 10 and the other electric wire 20, and at that time, the tip 30 for ultrasonic welding horn is formed along the direction in which the electric wires 10, 20 are extended. The one electric wire 10 and the other electric wire 20 are arranged so as to intersect with each other so that the concavo-convex knurl pattern 35P is formed, and ultrasonic welding is performed, so that the one electric wire 10 and the other electric wire 20 are joined. Misalignment of time is prevented in advance. Generation | occurrence | production of position shift of the electric wires 10 and 20 when single wire orthogonal joining is performed is suppressed substantially. Therefore, the connection electric wire 1 without a large positional deviation can be provided to an automobile parts assembly manufacturer or the like. What is shown to Fig.1 (a) is the connection structure of the electric wire in which positioning work is easy to be performed.

  The concavo-convex shape transferred to one electric wire 10 and the other electric wire 20 by the concavo-convex knurl pattern 35P (FIG. 2 (a)) of the ultrasonic welding horn tip 30 (FIG. 2 (a), FIG. 3 (a)). The knurl pattern 35T (FIG. 1A) includes one protrusion 31T provided substantially along the longitudinal direction 10L of one electric wire 10 and the other provided substantially along the longitudinal direction 20L of the other electric wire 20. Projecting portion 32T. In a plan view of the connecting wire 1, the one protruding portion 31 </ b> T having a substantially protruding shape is formed at the substantially center in the radial direction of the one wire 10. Further, the other protruding portion 32 </ b> T having a substantially ridge shape is formed at a substantially central portion in the radial direction of the other electric wire 20 in a plan view of the connecting wire 1.

  One projecting portion 31T provided along the longitudinal direction 10L of the one electric wire 10 is one of the substantially V-groove shapes constituting the concavo-convex knurl pattern 35P of the ultrasonic welding horn tip 30 (FIG. 2A). One straight portion 31 </ b> T (FIG. 1A) formed corresponding to the concave portion 31. The other protrusion 32T provided along the longitudinal direction 20L of the other electric wire 20 has a substantially V-groove shape that constitutes the concavo-convex knurl pattern 35P of the ultrasonic welding horn tip 30 (FIG. 2A). The other straight portion 32 </ b> T (FIG. 1A) is formed corresponding to the other concave portion 32.

  By using such an ultrasonic welding horn tip 30, it is more difficult to generate a positional shift when one of the electric wires 10 and the other electric wire 20 are arranged so as to be ultrasonically welded. Accordingly, it is possible to provide the connecting wire 1 with higher accuracy to an automobile parts assembly manufacturer or the like. As shown in FIG. 1A, one electric wire 10 is joined to the other electric wire 20 without significantly deviating from the reference line 10X set before ultrasonic welding is performed. As described above, the structure shown in FIG. 1A has a crossed wire fixing structure excellent in dimensional accuracy.

  Immediately before the ultrasonic welding is performed, the one electric wire 10 and the other electric wire 20 are arranged to intersect each other at a predetermined position, and when this is viewed in plan, the reference line 10X is an abbreviation of the one electric wire 10. Centered. After the ultrasonic welding is performed, when the connection electric wire is viewed in plan, the amount of deviation of one electric wire 10 with respect to the reference line 10X can be known.

  Next, a method for joining electric wires using an ultrasonic welding apparatus will be described.

  First, the ultrasonic welding method will be briefly described. An object to be welded is placed on an anvil of an ultrasonic welding apparatus, that is, a cradle, and a static pressure is applied to a joint surface of the object to be welded by a horn of the ultrasonic welding apparatus. Apply ultrasonic vibration. As a result, the interface to be joined is rubbed, and the oxide film and attached impurities are mechanically cleaned, and a rapid plastic flow is generated, so that the joining surfaces are joined in a solid state. In this way, ultrasonic bonding is performed.

  Based on this, one electric wire 10 (FIG. 1 (a), FIG. 2 (a)) and the other electric wire 20 which cross | intersects in the state substantially orthogonal with respect to the one electric wire 10 are made into an ultrasonic welding method. The connection electric wire 1 is comprised by joining based. An ultrasonic welding horn tip 30 (FIGS. 2 (a) and 3 (a)) for holding both electric wires 10 and 20 and transmitting ultrasonic waves to both electric wires 10 and 20, and this ultrasonic welding horn tip 30 Ultrasonic welding is performed using a mating anvil tip corresponding to the above.

  The knurl 35 provided on the ultrasonic welding horn tip 30 and the knurl provided on the counterpart anvil tip have the same shape and shape. That is, the ultrasonic welding horn tip 30 can be used as the anvil tip (30). The anvil tip (30) can be used as the tip 30 for an ultrasonic welding horn. The knurl is, for example, a fine ridge formed on the surface.

  The ultrasonic welding apparatus includes a high frequency vibration generator (not shown) such as a horn or a transducer that vibrates the ultrasonic welding horn tip 30 at a high frequency, an ultrasonic welding horn tip 30 attached to the horn, and ultrasonic welding. It is provided with at least a mating anvil tip equipped to face the horn tip 30 and an anvil (not shown) to which the anvil tip is attached. As an ultrasonic welding apparatus, the US Sonobonno company make, Sonomac Japan company sale: Ultrasonic welding machine MH-2014D (brand name) etc. are mentioned, for example.

  One electric wire 10 is brought into contact with the ultrasonic welding horn tip 30, and the other electric wire 20 (FIG. 2A) substantially orthogonal to the one electric wire 10 is brought into contact with the anvil tip. One electric wire 10 and the other electric wire 20 are sandwiched between the ultrasonic welding horn tip 30 and the counterpart anvil tip corresponding to the ultrasonic welding horn tip 30, and the ultrasonic welding horn tip 30. And ultrasonic welding is performed in a state where both the electric wires 10 and 20 are pressed with the anvil tip.

  A preferred relationship between the horn-side tip 30 and the anvil-side tip will be described with reference to FIG. 2A. Each of the knurl tip 34a and the knurl tip 34a on the wire pressing surface 30a side is expanded in all directions. The area of the inclined surface 34p may be the same area for both the horn side chip 30 and the anvil side chip. Moreover, the horn side chip | tip 30 and the anvil side chip | tip in which the same knurl pattern 35P was formed are good to be used.

  If the ultrasonic welding horn tip 30 and the counterpart anvil tip corresponding to the ultrasonic welding horn tip 30 have the same shape and form, the same type of electric wires 10 and 20 are orthogonal to each other. Bondability when bonded is improved. Note that ultrasonic welding may be performed using a mating anvil tip (not shown) of another form different from the ultrasonic welding horn tip 30 depending on the specifications of the electric wires 10 and 20 and the like.

  One electric wire 10 and the other electric wire 20 are crossed so as to be substantially orthogonal to each other, and the electric wires 10 and 20 are fitted to a substantially concavo-convex knurl 35 provided on the tip 30 for an ultrasonic welding horn. The electric wires 10 and 20 are aligned with a substantially uneven knurl provided on the chip for ultrasonic welding.

  When joining one electric wire 10 and the other electric wire 20, the one electric wire 10 and the other electric wire 20 are combined with the substantially uneven knurled 35 provided on the ultrasonic welding horn tip 30. Since the electric wires 10 and 20 are combined and ultrasonic welding is performed on the substantially uneven knurled provided on the chip, the positional deviation when the one electric wire 10 and the other electric wire 20 are joined is prevented. The The positional deviation of the electric wires 10 and 20 generated when performing the single wire orthogonal joining can be substantially suppressed. Thereby, the work efficiency at the time of joining one electric wire 10 and the other electric wire 20 improves.

  As shown in FIGS. 2 (a) and 3 (a), the substantially concavo-convex knurl 35 has one groove (concave portion) 31 having a substantially V-shaped cross section corresponding to one electric wire 10 and the other electric wire 20 (FIG. 2 (a)) and at least the other groove (concave portion) 32 having a substantially V-shaped cross section substantially orthogonal to one groove 31. One electric wire 10 is disposed in one groove 31 along one groove 31, and the other electric wire 20 is disposed in the other groove 32 along the other groove 32 to perform ultrasonic welding.

  One electric wire 10 is arranged in one groove 31 along one groove 31 of the substantially uneven knurl 35, and the other electric wire 20 is arranged in the other groove along the other groove 32 of the substantially uneven knurl 35. Since the ultrasonic welding is performed by arranging in the position 32, the occurrence of displacement when the one electric wire 10 and the other electric wire 20 are joined is further prevented.

  In addition, as shown in FIG. 2A, in the crossing portion 6A of one electric wire 10 and the other electric wire 20 substantially orthogonal to one electric wire 10, one groove 31 and one groove 31 of the knurl 35 are provided. Ultrasonic welding is performed by combining the intersecting portion 33 with the other substantially orthogonal groove 32. That is, as shown in FIG. 2A, in a plan view of the connecting wire 1, the intersection 6 </ b> A between one electric wire 10 and the other electric wire 20 joined to the one electric wire 10, and one groove 31 of the knurl 35. The ultrasonic welding is performed by matching the intersecting portion 33 with the other groove 32 substantially orthogonal to the one groove 31. Ultrasonic welding is performed without bringing the tip 34a of the projection 34 of the knurl 35 into contact with the substantially central portion of the joint 6A of the two electric wires 10 and 20.

  When the ultrasonic welding horn tip 30 is viewed from the side of the electric wire pressing surface 30a, at the center of the ultrasonic welding horn tip 30, one concave portion 31 having a substantially V groove shape and the other concave portion having a substantially V groove shape are provided. An intersection 33 with 32 is provided.

  An intersection of one wire 10 and the other wire 20 that is substantially orthogonal to the one wire 10, an intersection of one groove 31 of the knurl 35 and the other groove 32 that is substantially orthogonal to the one groove 31 When the ultrasonic welding is performed, the intersecting portion 6A between the one electric wire 10 and the other electric wire 20 is almost at the intersecting portion 33 between the one groove 31 of the knurl 35 and the other groove 32. Can be stored. Thereby, when performing ultrasonic welding, it becomes difficult to generate | occur | produce the position shift of the electric wire in the cross | intersection part 6A of the one electric wire 10 and the other electric wire 20. FIG.

  Further, when performing ultrasonic welding, the knurl 35 of the ultrasonic welding horn tip 30 and the knurl of the anvil tip can be fitted together without being offset. More specifically, when the ultrasonic welding horn tip 30 is fitted to the anvil tip, the knurl tip 34a of the horn tip 30 and the knurl tip of the anvil tip are abutted against each other. 30 and anvil chip are arranged. The knurl tip portion 34a and the anvil tip portion are planar tip portions of a substantially pyramidal quadrangular pyramid. In addition, what formed the knurl | tip front-end | tip part (34a) and the anvil front-end | tip part in the convex shape of another form can also be used.

  As shown in FIG. 2 (a), the substantially uneven knurl 35 provided on the ultrasonic welding tip 30 is formed by the substantially quadrangular pyramid-shaped convex portions 34 formed by the inclined surfaces 34p and the inclined surfaces 34p. The substantially V-groove shaped recesses 31 and 32 are provided. As shown in FIGS. 2 (a) and 3 (a), the convex portion 34 constituting the knurl 35 is formed in a substantially quadrangular pyramid, for example.

  If such an ultrasonic welding tip 30 (FIG. 2A) is formed, the one electric wire 10 and the other electric wire 20 intersecting with the one electric wire 10 are guided by the inclined surfaces 34p, It becomes easy to be attached to the concave portions 31 and 32 of the substantially uneven knurl 35. Therefore, when one electric wire 10 and the other electric wire 20 are joined by ultrasonic welding, the electric wires 10 and 20 are easily and reliably positioned and ultrasonic welding is performed. And the other electric wire 20 are further prevented from being displaced.

  When the electric wires 10, 20 are attached to the knurl 35, the electric wires 10, 20 are connected to the tip end 34 a of the substantially quadrangular pyramid-shaped convex portion 34 that constitutes the nar 35 and the substantially quadrangular pyramidal convex portion adjacent to the convex portion 34. It is located between the tip 34a of 34. That is, the electric wires 10 and 20 are fitted into the substantially V-shaped concave portions 31 and 32 constituting the knurl 35. Since the electric wires 10 and 20 are disposed so as to be sandwiched between the knurls 35, the knurls 35 are easily positioned with respect to the electric wires 10 and 20. Thus, it is the optimum ultrasonic welding method that ultrasonic welding is performed in a state where the electric wires 10 and 20 are fitted to the knurl 35.

  After the ultrasonic welding is performed, a recess 34T (FIG. 1A) corresponding to the convex portion 34 of the ultrasonic welding horn tip 30 is formed in the intersecting portion 6A of the connecting wire 1. The recess 34T includes a bottom 34b (FIG. 1 (a)) corresponding to the knurl tip 34a of the ultrasonic welding horn tip 30 (FIG. 2 (a)) and an ultrasonic welding horn tip 30 (FIG. 2 ( a) and an inclined surface 34q (FIG. 1A) corresponding to the inclined surface 34p.

  The depression 34T is not formed at the center of the intersection 6A between the one electric wire 10 and the other electric wire 20. When the electric wires 10 and 20 are brought into contact with the uneven portion 35 of the chip 30 (FIG. 2A), the electric wires 10 and 20 are automatically positioned with respect to the uneven portion 35 of the chip 30.

  Various types of knurls 35 provided in the chip 30 can be applied. For example, a knurl (not shown) including a convex portion formed in a substantially triangular pyramid shape can be used as the shape of the convex portion (34) constituting the knurl (35). The triangular pyramid means a pyramid having a triangular bottom surface. Moreover, as a shape of the convex part (34) which comprises the knurl (35), the knurl (not shown) provided with a substantially conical convex part, for example can also be used.

  Below, the connection electric wire of a 1st comparative example-a 3rd comparative example is manufactured using the chip | tip 40,50,60 for ultrasonic welding horn shown in FIG.2 (b)-FIG.2 (d). The connection electric wires of the first comparative example to the third comparative example are manufactured under the same conditions as the joining conditions of the ultrasonic welding apparatus set at the time of manufacturing the connection electric wire 1 of the first embodiment.

  FIG.1 (b) is a top view which shows the 1st comparative example of a connecting wire, FIG.2 (b) is explanatory drawing which similarly shows the 1st comparative example of a connecting wire.

  The same components as those described with reference to FIGS. 1A, 2A, and 3A are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 1B and FIG. 2B, one electric wire 10 and the other electric wire 20 intersecting in a state substantially orthogonal to the one electric wire 10 are joined by an ultrasonic welding method. A connecting wire 1X is configured. Under the same conditions as the joining conditions of the ultrasonic welding apparatus set when the connecting wire 1 (FIG. 1 (a)) of the first embodiment was manufactured, the connecting wire 1X of the first comparative example (FIG. 1 (b)). ) Is manufactured.

  For ultrasonic welding, a tip 40 for an ultrasonic welding horn shown in FIG. 2B is used. The horn chip 40 is provided with a concavo-convex portion 45 called a knurl 45. As shown in FIG. 2B, when the tip 40 is viewed in plan from the wire pressing surface 40a side of the ultrasonic welding horn tip 40, a substantially square knurled pattern 45P is aligned on the wire pressing surface 40a side of the tip 40. It is installed.

  On the side of the wire pressing surface 40a of the ultrasonic welding horn tip 40, approximately one V-shaped recess 41 is arranged in parallel at approximately equal intervals, and approximately V-groove substantially orthogonal to each one recess 41 is provided. The other recesses 42 are arranged in parallel at substantially equal intervals, and the interval 41S between the one recesses 41 and the interval 42S between the other recesses 42 are set to be substantially equal intervals. A knurl pattern 45P is arranged in parallel on the wire pressing surface 40a side of the ultrasonic welding horn tip 40.

  Each one of the substantially V-shaped recesses 41 is inclined and extended at an angle of approximately 45 ° with respect to the one end 40s or the other end 40t of the ultrasonic welding horn tip 40. Each of the other concave portions 42 having a substantially V-groove shape is also inclined and extended at an angle of about 45 ° with respect to the one side end portion 40s or the other side end portion 40t of the ultrasonic welding horn tip 40. Yes. Each of the substantially V-groove-shaped concave portions 41 and the other substantially V-groove-shaped concave portion 42 are formed by profile polishing. The other end 40t is substantially orthogonal to the one end 40s of the ultrasonic welding horn tip 40, and the horn tip 40 is a substantially rectangular pressing piece in plan view.

  When the ultrasonic welding horn tip 40 is viewed from the wire pressing surface 40a side, the knurl pattern 45P of the ultrasonic welding horn tip 40 has an angle of 45 ° with respect to the electric wire 10 and is centered at the center of the tip 40. There is no part. When the ultrasonic welding horn tip 40 is viewed from the electric wire pressing surface 40a side, an intersection 43 between one groove 41 and the other groove 42 is provided at substantially the center of the ultrasonic welding horn tip 40.

  The concavo-convex knurl pattern 45T (FIG. 1 (b)) transferred to the one electric wire 10 and the other electric wire 20 by the concavo-convex nar pattern 45P of the ultrasonic welding horn tip 40 (FIG. 2 (b)) One protruding portion 41T provided to be inclined at an angle of about 45 ° with respect to the longitudinal direction 10L of the other electric wire 10 or the longitudinal direction 20L of the other electric wire 20, and the longitudinal direction 10L of the one electric wire 10 or the other electric wire And the other protrusion 42T provided to be inclined at an angle of approximately 45 ° with respect to the longitudinal direction 20L.

  One protrusion 41T provided to be inclined at an angle of about 45 ° with respect to the longitudinal direction 10L of one electric wire 10 or the longitudinal direction 20L of the other electric wire 20 is an ultrasonic welding horn tip 40 (FIG. 2 ( b)) is formed corresponding to the one concave portion 41 having a substantially V-groove shape constituting the concavo-convex knurl pattern 45P. In addition, the other protrusion 42T provided to be inclined at an angle of about 45 ° with respect to the longitudinal direction 10L of one electric wire 10 (FIG. 1B) or the longitudinal direction 20L of the other electric wire 20 is an ultrasonic wave. It is formed corresponding to the other concave portion 42 having a substantially V-groove shape constituting the concave-convex knurled pattern 45P of the welding horn tip 40 (FIG. 2B).

  As shown in FIG. 2B, the substantially uneven knurl 45 provided on the ultrasonic welding tip 40 is formed by the substantially quadrangular pyramidal convex portions 44 formed by the inclined surfaces 44p and the inclined surfaces 44p. The substantially V-groove shaped recessed parts 41 and 42 are provided. The convex portion 44 constituting the knurl 45 is formed in a substantially quadrangular pyramid shape having, for example, a pyramid shape. When the electric wires 10, 20 are attached to the knurl 45, the electric wires 10, 20 are positioned on the distal end portion 44 a of the substantially square pyramid-shaped convex portion 44 that constitutes the knurl 45.

  For this reason, the electric wire 10 after the ultrasonic welding is performed is slightly shifted with respect to the reference line 10X as shown in FIG. One electric wire 10 is ultrasonically welded to the other electric wire 20 while being displaced.

  After ultrasonic welding is performed, a hollow portion 44T (FIG. 1B) corresponding to the convex portion 44 of the ultrasonic welding horn tip 40 (FIG. 2B) is formed at the intersecting portion 6B of the connecting wire 1X. It is formed. The recess 44T includes a bottom 44b (FIG. 1 (b)) corresponding to the knurl tip 44a of the ultrasonic welding horn tip 40 (FIG. 2 (b)) and an ultrasonic welding horn tip 40 (FIG. 2 (b)). b)) and an inclined surface 44q (FIG. 1B) corresponding to the inclined surface 44p.

  The hollow portion 44T is not formed at the center of the intersection 6B between the one electric wire 10 and the other electric wire 20. Moreover, the substantially linear protrusion part along the direction where one electric wire 10 is extended, and the other electric wire 20 are extended in the center of the crossing part 6B of one electric wire 10 and the other electric wire 20. The substantially linear protrusion part along the direction which goes is not formed. For this reason, the center of the intersecting portion 6B of the connecting wire 1X tends to be slightly shifted.

  Next, the 2nd comparative example of a connection electric wire is demonstrated based on drawing.

  FIG. 1C is a plan view showing a second comparative example of the connecting wire, FIG. 2C is an explanatory view showing the second comparative example of the connecting wire, and FIG. It is a side view which shows a 2nd comparative example.

  As shown in FIG. 1 (c) and FIG. 2 (c), one electric wire 10 and the other electric wire 20 intersecting in a state substantially orthogonal to the one electric wire 10 are joined by ultrasonic welding, A connecting wire 2X is configured. Under the same conditions as the joining conditions of the ultrasonic welding apparatus set when the connecting wire 1 (FIG. 1 (a)) of the first example was manufactured, each connecting wire 2X (FIG. 1 (c) of the second comparative example was used. )) Is manufactured.

  During ultrasonic welding, the ultrasonic welding horn tip 50 shown in FIGS. 2C and 3B is used. The horn chip 50 is provided with a concavo-convex portion 55 called a knurl 55. As shown in FIG. 2C, when the chip 50 is viewed in plan from the wire pressing surface 50a side of the ultrasonic welding horn chip 50, a substantially square knurled pattern 55P is arranged on the wire pressing surface 50a side. It is installed. The electric wire pressing surface 50 a is the top surface of the mountain-shaped convex portion 54.

  On the side of the wire pressing surface 50 a of the ultrasonic welding horn tip 50, each of the substantially V-groove-shaped recesses 51 is arranged in parallel at approximately equal intervals, and is approximately V-groove that is substantially orthogonal to each of the recesses 51. The other recesses 52 are arranged in parallel at substantially equal intervals, and the interval 51S between the one recesses 51 and the interval 52S between the other recesses 52 are approximately equal intervals. 55P is juxtaposed on the wire pressing surface 50a side of the ultrasonic welding horn tip 50. The interval 51 </ b> S is defined at the valley bottom of the recess 51.

  Each one concave portion 51 having a substantially V-groove shape is provided so as to be substantially parallel to one end portion 50s of the ultrasonic welding horn tip 50. Further, each other concave portion 52 having a substantially V-groove shape is provided so as to be substantially parallel to the other end portion 50 t of the ultrasonic welding horn tip 50. Each of the substantially V-groove-shaped recesses 51 and each of the approximately V-groove-shaped recesses 52 are formed by profile polishing. The other end 50t is substantially perpendicular to the one end 50s of the ultrasonic welding horn tip 50, and the horn tip 50 is a substantially rectangular pressing piece in plan view.

  When the ultrasonic welding horn tip 50 is viewed from the electric wire pressing surface 50a side, the knurl pattern 55P of the ultrasonic welding horn tip 50 has an angle of 0 ° with respect to the electric wire 10 and is centered at the center of the tip 50. Has a part. When the ultrasonic welding horn tip 50 is viewed from the electric wire pressing surface 50a side, the tip portion 54a of the substantially pyramid-shaped convex portion 54 is positioned substantially at the center of the ultrasonic welding horn tip 50. The intersection 53 between one groove 51 and the other groove 52 is not provided at the approximate center of the ultrasonic welding horn tip 50, and the intersection 53 is displaced from the approximate center of the ultrasonic welding horn tip 50. Located in the place.

  The concavo-convex knurl pattern 55T (FIG. 1 (c)) transferred to the one electric wire 10 and the other electric wire 20 by the concavo-convex knurl pattern 55P of the ultrasonic welding horn tip 50 (FIG. 2 (c)) One protruding portion 51T provided substantially along the longitudinal direction 10L of the electric wire 10 and the other protruding portion 52T provided substantially along the longitudinal direction 20L of the other electric wire 20 are provided. In a state in which the connection electric wire 2X is viewed in plan, the one protruding portion 51T having a substantially protruding shape is formed at the approximate center of the one electric wire 10 that is displaced.

  One projecting portion 51T provided substantially along the longitudinal direction 10L of the one electric wire 10 has a substantially V-groove shape constituting the concavo-convex knurl pattern 55P of the ultrasonic welding horn tip 50 (FIG. 2C). It is formed corresponding to one recess 51. The other protrusion 52T provided substantially along the longitudinal direction 20L of the other electric wire 20 (FIG. 1 (c)) is an uneven knurl pattern of the ultrasonic welding horn tip 50 (FIG. 2 (c)). It is formed so as to correspond to the other concave portion 52 having a substantially V groove shape constituting 55P.

  As shown in FIG. 2C, the substantially uneven knurl 55 provided on the ultrasonic welding tip 50 is formed by the substantially square pyramidal convex portions 54 formed by the inclined surfaces 54p and the inclined surfaces 54p. The substantially V-groove shaped recessed parts 51 and 52 are provided. As shown in FIGS. 2C and 3B, the convex portion 54 constituting the knurl 55 is formed in a substantially quadrangular pyramid shape having a pyramid shape, for example. When the electric wires 10, 20 are attached to the knurl 55, the electric wires 10, 20 are positioned on the distal end portion 54 a of the substantially quadrangular pyramid-shaped convex portion 54 constituting the knurl 55.

  For this reason, the electric wire 10 after ultrasonic welding is largely shifted with respect to the reference line 10X as shown in FIG. One electric wire 10 is ultrasonically welded to the other electric wire 20 in a state of being largely displaced. As shown in FIG. 3B, the electric wire 10 having a substantially circular cross section comes into contact with the substantially flat knurled tip 54 a, and therefore, the electric wire 10 having a substantially circular cross section is easily displaced with respect to the chip 50 having the uneven portion 55.

  After ultrasonic welding is performed, a recess 54T (FIG. 1C) corresponding to the convex portion 54 of the ultrasonic welding horn tip 50 (FIG. 2C) is formed at the intersection 6C of the connecting wire 2X. Is done. The recess 54T includes a bottom 54b (FIG. 1C) corresponding to the knurl tip 54a of the ultrasonic welding horn tip 50 (FIG. 2C), and an ultrasonic welding horn tip 50 (FIG. 2C). c)) and an inclined surface 54q (FIG. 1 (c)) corresponding to the inclined surface 54p.

  The depression 54T is not formed at the center of the intersection 6C between the one electric wire 10 and the other electric wire 20, and the depression 54T is formed at the intersection 6C between the one electric wire 10 and the other electric wire 20. It is formed at a position shifted from the center. For this reason, the one electric wire 10 in the electric wire crossing part 6C is ultrasonically bonded to the other electric wire 20 in a bent state, and the connection electric wire 2X is configured.

  Next, the 3rd comparative example of a connection electric wire is demonstrated based on drawing.

  FIG.1 (d) is a top view which shows the 3rd comparative example of a connection electric wire, and FIG.2 (d) is explanatory drawing which similarly shows the 3rd comparative example of a connection electric wire.

  As shown in FIG. 1 (d) and FIG. 2 (d), one electric wire 10 and the other electric wire 20 intersecting in a state substantially orthogonal to the one electric wire 10 are joined by an ultrasonic welding method. A connecting wire 3X is configured. Each connection wire 3X (FIG. 1 (d)) of the third comparative example is manufactured under the same conditions as the joining conditions of the ultrasonic welding apparatus that manufactured the connection wire 1 (FIG. 1 (a)) of the first embodiment. The

  For ultrasonic welding, an ultrasonic welding horn tip 60 shown in FIG. 2D is used. The horn chip 60 is provided with a concavo-convex portion 65 called a knurl 65. As shown in FIG. 2D, a substantially square knurl pattern 65P is arranged in parallel on the wire pressing surface 60a side of the chip 60 in plan view.

  On the wire pressing surface 60 a side of the ultrasonic welding horn tip 60, approximately one V-shaped recess 61 is arranged in parallel at approximately equal intervals, and approximately V-groove substantially orthogonal to each recess 61. The other recesses 62 are arranged in parallel at substantially equal intervals, and the interval 61S between the one recesses 61 and the interval 62S between the other recesses 62 are approximately equal to each other. 65P is juxtaposed on the wire pressing surface 60a side of the ultrasonic welding horn tip 60.

  Each one of the substantially V-shaped recesses 61 is inclined and extended at an angle of about 45 ° with respect to one end 60s or the other end 60t of the ultrasonic welding horn tip 60. Each of the other concave portions 62 having a substantially V-groove shape is also inclined and extended at an angle of about 45 ° with respect to one end portion 60s or the other end portion 60t of the ultrasonic welding horn tip 60. Yes. Each of the substantially V-groove-shaped concave portions 61 and the other substantially V-groove-shaped concave portion 62 are formed by profile polishing. The other end 60t is substantially orthogonal to the one end 60s of the ultrasonic welding horn tip 60, and the horn tip 60 is a substantially rectangular pressing piece in plan view.

  When the ultrasonic welding horn tip 60 is viewed from the wire pressing surface 60a side, the knurl pattern 65P of the ultrasonic welding horn tip 60 has an angle of 45 ° with respect to the electric wire 10 and is centered at the center of the tip 60. Has a part. Further, the tip portion 64 a of the substantially pyramid-shaped convex portion 64 is located at the approximate center of the ultrasonic welding horn tip 60. The intersection 63 between one groove 61 and the other groove 62 is not provided at the approximate center of the ultrasonic welding horn tip 60, and the intersection 63 is displaced from the approximate center of the ultrasonic welding horn tip 60. Located in the place.

  The uneven knurl pattern 65T (FIG. 1 (d)) transferred to the one electric wire 10 and the other electric wire 20 by the concavo-convex knurl pattern 65P of the ultrasonic welding horn tip 60 (FIG. 2 (d)) One protrusion 61T provided to be inclined at an angle of about 45 ° with respect to the longitudinal direction 10L of the other electric wire 10 or the longitudinal direction 20L of the other electric wire 20, and the longitudinal direction 10L of the one electric wire 10 or the other electric wire 20 and the other protrusion 62T provided to be inclined at an angle of approximately 45 ° with respect to the longitudinal direction 20L.

  One protrusion 61T provided to be inclined at an angle of about 45 ° with respect to the longitudinal direction 10L of one electric wire 10 or the longitudinal direction 20L of the other electric wire 20 is an ultrasonic welding horn tip 60 (FIG. 2 ( d)) is formed so as to correspond to one of the substantially V-shaped concave portions 61 constituting the concavo-convex knurl pattern 65P. The other protrusion 62T provided at an angle of approximately 45 ° with respect to the longitudinal direction 10L of one electric wire 10 (FIG. 1D) or the longitudinal direction 20L of the other electric wire 20 is an ultrasonic wave. It is formed corresponding to the other concave portion 62 having a substantially V-groove shape that constitutes the concave / convex knurled pattern 65P of the welding horn tip 60 (FIG. 2 (d)).

  As shown in FIG. 2D, the substantially concave-convex knurl 65 provided on the ultrasonic welding tip 60 is formed by the substantially quadrangular pyramid-shaped convex portions 64 formed by the inclined surfaces 64p and the inclined surfaces 64p. The substantially V-groove shaped recessed parts 61 and 62 are provided. The convex part 64 which comprises the knurl 65 is formed in the shape of the substantially quadrangular pyramid, for example. When the electric wires 10, 20 are attached to the knurl 65, the electric wires 10, 20 are positioned on the distal end portion 64 a of the substantially quadrangular pyramid-shaped convex portion 64 constituting the knurl 65.

  For this reason, the electric wire 10 after ultrasonic welding is largely shifted with respect to the reference line 10X as shown in FIG. One electric wire 10 is ultrasonically welded to the other electric wire 20 in a state of being largely displaced.

  After ultrasonic welding is performed, a recess 64T (FIG. 1 (d)) corresponding to the convex portion 64 of the ultrasonic welding horn tip 60 (FIG. 2 (d)) is formed at the intersection 6D of the connecting wire 3X. It is formed. The recess 64T includes a bottom 64b (FIG. 1 (d)) corresponding to a knurl tip 64a of the ultrasonic welding horn tip 60 (FIG. 2 (d)) and an ultrasonic welding horn tip 60 (FIG. 2 (d)). d)) and an inclined surface 64q (FIG. 1 (d)) corresponding to the inclined surface 64p.

  The depression 64T is not formed at the center of the intersection 6D between the one electric wire 10 and the other electric wire 20, and the depression 64T extends from the center of the intersection 6D between the one electric wire 10 and the other electric wire 20. , Formed at a shifted position. For this reason, the one electric wire 10 and the other electric wire 20 are ultrasonically bonded in a state of being largely displaced to constitute the connection electric wire 3X.

  Next, the tensile strength (welding strength) of the connecting wire formed by performing the ultrasonic welding will be described.

  FIG. 4A is a diagram showing the tensile strength of the first embodiment of the connecting wire according to the present invention, FIG. 4B is a diagram showing the tensile strength of the first comparative example of the connecting wire, and FIG. ) Is a diagram showing the tensile strength of the second comparative example of the connecting wire, and FIG. 4D is a diagram showing the tensile strength of the third comparative example of the connecting wire.

  Each vertical axis in FIG. 4 represents the tensile strength (N ... Newton) of the connecting wire, and each horizontal axis represents the pressing load of one wire against the other wire (MPa ... megapascal) when ultrasonic welding is performed. Is shown. The number of samples (connection wires) is, for example, one for each pressing load, and the maximum tensile strength of the connection wires is indicated by a band graph. There are two types of damage to the connecting wire by the tensile test: when the wire peels off from the welded portion, and when the wire itself breaks, and when the wire breaks, the strength of the welded portion is more than that, Excellent welding strength.

  By the ultrasonic welding method, the connecting wire 1 of the first embodiment (FIG. 1A), the connecting wire 1X of the first comparative example (FIG. 1B), or the connecting wire 2X of the second comparative example (see FIG. 1 (c)), or when the connecting wire 3X of the third comparative example (FIG. 1 (d)) is manufactured, the pressing force of the one electric wire 10 against the other electric wire 20 is changed as shown in FIGS. As described above, the pressure was adjusted to 0.15 MPa, 0.17 MPa, and 0.19 MPa, and how the welding strength changed for each pressing load was measured. The vibration energy of the ultrasonic welding apparatus can be changed, for example, 30J, 40J, and 50J. However, the object to be measured (connection electric wire) in FIG.

  At the time of manufacturing each connecting wire 1 of the first embodiment (FIG. 4A), the wire 10 is placed in the same direction as the extending direction of the recess 31 of the knurl 35, that is, with respect to the recess 31 of the knurl 35 as shown in FIG. The wire 10 is set to an angle of 0 °, and the tip 30 of the knurl pattern 35P in which the knurl tip 34a is not located at the center of the intersection 6A of the wires 10, 20 is used. Sonic bonding was performed to produce a connection wire 1 having a knurl pattern 35T (FIG. 1A). Then, the tension test for investigating the joining force (welding strength) with the one electric wire 10 which comprises the connection electric wire 1, and the other electric wire 20 was done. As shown in FIG. 4A, the connecting wire 1 of the first embodiment, that is, the sample used for conducting the tensile test is shown as “0 ° shift” for convenience.

  When manufacturing each connecting wire 1X of the first comparative example (FIG. 4B), as shown in FIG. 2B, the wire 10 is set at an angle of 45 ° with respect to the extending direction of the recess 41 of the knurl 45, Further, using the tip 40 of the knurl pattern 45P in which the knurl tip 44a is not located at the center of the intersecting portion 6B of the wires 10 and 20, the knurl pattern 45T (FIG. 1 ( A connecting wire 1X provided with b)) was manufactured. Then, the tension test for investigating the joining force of the one electric wire 10 which comprises the connection electric wire 1X, and the other electric wire 20 was done. As shown in FIG. 4B, the connecting wire 1X of the first comparative example, that is, the sample used for performing the tensile test is shown as “45 ° shift” for convenience.

  Moreover, when each connection electric wire 2X of the second comparative example (FIG. 4C) is manufactured, the electric wire 10 is arranged in the same direction as the extension direction of the recess 51 of the knurl 55, that is, the knurl 55 of the knurl 55 as shown in FIG. The wire 10 is set at an angle of 0 ° with respect to the recess 51, and the tip 50 of the knurl pattern 55P in which the knurl tip 54a is located at the center of the intersecting portion 6C of the wires 10 and 20 is used. , 20 was joined to produce a connecting wire 2X having a knurl pattern 55T (FIG. 1 (c)). Then, the tension test for investigating the joining force of one electric wire 10 which comprises the connection electric wire 2X, and the other electric wire 20 was done. As shown in FIG. 4C, the connecting wire 2X of the second comparative example, that is, the sample used for conducting the tensile test is shown as “0 ° center” for convenience.

  Further, when each connection wire 3X of the third comparative example (FIG. 4D) is manufactured, the wire 10 is inclined at an angle of 45 ° with respect to the extending direction of the recess 61 of the knurl 65 as shown in FIG. And using the tip 60 of the knurl pattern 65P in which the knurl tip 64a is located at the center of the intersecting portion 6D of the wires 10 and 20, the wires 10 and 20 are ultrasonically bonded, and the knurl pattern A connecting wire 3X having 65T (FIG. 1 (d)) was manufactured. Then, the tension test for investigating the joining force of one electric wire 10 which comprises the connection electric wire 3X, and the other electric wire 20 was done. As shown in FIG. 4D, the connection wire 3X of the third comparative example, that is, the sample used for performing the tensile test is indicated as “45 ° center” for convenience.

  Each connecting wire 1X (FIG. 1 (b)) of the first comparative example, each connecting wire 2X (FIG. 1 (c)) of the second comparative example, and each connecting wire 3X (FIG. 1 (d) of the third comparative example. )) Is manufactured based on the same conditions as the joining conditions of the ultrasonic welding apparatus set at the time of manufacture of each connecting wire 1 (FIG. 1A) of the first embodiment (FIG. 4A). To (d)).

  Moreover, the same sample holder is used and the setting conditions of the tensile tester are maintained without changing the same conditions, and the connection wire 1 of the first embodiment, the connection wire 1X of the first comparative example, and the second comparison. A tensile test was performed on the connection wire 2X of the example and the connection wire 3X of the third comparative example.

  FIG. 5 is a diagram showing the amount of displacement of the horn tip when ultrasonic welding is performed. In order to perform ultrasonic welding, the pressing amount of the tip for ultrasonic welding horn when pressing the crossed electric wires was measured. The measurement of FIG. 5 was performed with the conditions of the vibration energy of the horn tip and the pressing force of the electric wires being constant from the first example to the third comparative example. In FIG. 5, the values indicated by the square points indicate the average value of the displacement amount in the plurality of samples (connection wires), and the lines extending vertically from the square similarly indicate the variation in the displacement amount.

  In the connecting wire 1 of the first embodiment in which an appropriate knurl pattern 35T (FIG. 1A) is formed, the absolute value of the tensile strength (N) is high as shown in FIG. Even when the load (MPa) is changed, there is little variation in tensile strength for each pressing load, and the load is stable.

  In addition, when the welding strength of a plurality of samples (connection electric wire 1) is confirmed by a tensile test (data display is omitted), the electric wires themselves are often broken instead of peeling from the welded portion (samples). 11 of the formula 15 is the breakage of the electric wire itself), which also shows that the welding strength is sufficiently high.

  Also, looking at the amount of horn displacement in FIG. 5, the first embodiment (0 ° shift) has a smaller amount of horn displacement than the other comparative examples, and forced crushing and position at the intersection of two wires The reason is that there is no deviation, and that the welding strength of the electric wire is high.

  On the other hand, in the connection electric wire 1X of the first comparative example in which the knurl pattern 45T (FIG. 1B) different from the proper knurl pattern 35T (FIG. 1A) is formed, the welding shown in FIG. In the strength test, the absolute value of the tensile strength (N) of the connecting wire 1X is significantly lower than that in the first embodiment of FIG. The variation in tensile strength for each pressing load (MPa) is not so large.

  In addition, when the welding strength of a plurality of samples (connection wire 1X) is confirmed by a tensile test (data display is omitted), the wire is rarely broken (1 out of 15 samples is the wire itself). Break)), and many of the wires are peeled and broken from the weld.

  Further, as in the first comparative example (45 ° shift) in FIG. 5, the displacement amount of the horn is large, and the sample is easily crushed or displaced easily. From these facts, it can be seen that the connecting wire 1X of the first comparative example (45 ° shift) is not sufficiently welded.

  Further, in the connection electric wire 2X of the second comparative example in which the knurl pattern 55T (FIG. 1C) different from the proper knurl pattern 35T (FIG. 1A) is formed, as shown in FIG. In the test, the variation in tensile strength (N) for each pressing load (MPa) is large, and when the pressing load is 0.19 MPa, the strength is similar to that of the first embodiment of FIG. Each time is reduced to 0.17 MPa and 0.15 MPa, the tensile strength is greatly reduced.

  In addition, when the welding strength of a plurality of samples (connection electric wire 2X) was confirmed by a tensile test (data display is omitted), the electric wire is rarely broken (3 out of 15 samples are of the electric wire itself). Break)), and many of the wires are peeled and broken from the weld.

  Further, as in the second comparative example (0 ° center) in FIG. 5, the displacement amount of the horn is large, and the sample is easily crushed or misaligned. For these reasons, in the connection electric wire 2X of the second comparative example (0 ° center), there is a difficulty that the welding quality is not stable and the management of the pressing load (MPa) must be thoroughly performed.

  Further, in the connection electric wire 3X of the third comparative example in which the knurl pattern 65T (FIG. 1 (d)) different from the proper knurl pattern 35T (FIG. 1 (a)) is formed, as shown in FIG. In the test (performed under two conditions of pressing loads 0.17 and 0.19), the absolute value of the tensile strength (N) was considerably lower than that of the first example of FIG. Although there is little variation in the tensile strength at 0.19, the tensile strength is low and stable as in the first comparative example of FIG. 4B, and it extends to the first example of FIG. It is not a thing.

  In addition, when the welding strength of a plurality of samples (connection wire 3X) is confirmed by a tensile test (data display is omitted), the wire is rarely broken (4 out of 15 samples are the wire itself). Break)), and many of the wires are peeled and broken from the weld.

  Further, as in the third comparative example (45 ° center) in FIG. 5, the displacement amount of the horn is large, and the sample is easily crushed or displaced. From these facts, it is understood that the wires are not sufficiently welded even in the connection wires 3X of the third comparative example (45 ° center).

  From the above measurement results, it can be seen that in the first comparative example, the second comparative example, and the third comparative example, when the ultrasonic bonding is performed, the bonding region is not sufficiently obtained. Moreover, since the strength variation generally increases when the material is broken by peeling, the material showing such a result is not desirable. When the tensile test is performed, it is desirable that the electric wire is broken and the tensile strength at that time is large.

  Further, as shown in FIG. 1B, in the connection electric wire 1 </ b> X of the first comparative example, as can be understood from the appearance inspection, the positional deviation occurs in the joint portion 6 </ b> B of the electric wires 10 and 20. From this, it is estimated that if the number of samples of the connecting wire 1X configured by ultrasonic bonding is increased, the variation in tensile strength increases.

  Further, as shown in FIG. 1C, in the connection electric wire 2X of the second comparative example, as can be seen from the appearance inspection, the positional deviation of the joint portion 6C of the electric wires 10 and 20 is large. When the knurl tip 54a of the knurl pattern 55P (FIG. 2C) is subjected to ultrasonic welding using the tip 50 positioned at the center of the knurl 55, as shown in FIG. The electric wire 10 is greatly shifted. From this, it is estimated that if the number of samples of the connecting wire 2X configured by ultrasonic bonding is increased, the variation in tensile strength increases.

  Further, as shown in FIG. 1D, also in the connection electric wire 3X of the third comparative example, the positional deviation of the joint portion 6D of the electric wires 10 and 20 is large as can be seen from the appearance inspection. When the knurl tip portion 64a of the knurl pattern 65P (FIG. 2D) is subjected to ultrasonic welding using the tip 60 located at the center of the knurl 65, as shown in FIG. The electric wire 10 is greatly shifted. From this, it is presumed that if the number of samples of the connecting wire 3X configured by ultrasonic bonding is increased, the variation in tensile strength increases.

(A) is a top view which shows the 1st Example of the connection electric wire which concerns on this invention, and the joining method of an electric wire, (b) is a top view which shows the 1st comparative example of a connection electric wire, (c) is the 2nd of a connection electric wire. The top view which shows a comparative example, (d) is a top view which shows the 3rd comparative example of a connection electric wire. (A) is explanatory drawing which shows the 1st Example of the connecting wire and the joining method of an electric wire which concern on this invention, (b) is explanatory drawing which shows the 1st comparative example of a connecting wire, (c) is the 2nd of a connecting wire. Explanatory drawing which shows a comparative example, (d) is explanatory drawing which shows the 3rd comparative example of a connection electric wire. (A) is a side view which shows the 1st Example of the connection electric wire which concerns on this invention, and the joining method of an electric wire, (b) is a side view which shows the 2nd comparative example of a connection electric wire. (A) is a figure which shows the tensile strength of the 1st Example of the connection electric wire which concerns on this invention, (b) is a figure which shows the tensile strength of the 1st comparative example of a connection electric wire, (c) is the 2nd comparison of a connection electric wire. The figure which shows the tensile strength of an example, (d) is a figure which shows the tensile strength of the 3rd comparative example of a connection electric wire. It is a figure which shows the displacement amount of the chip | tip for horns when ultrasonic welding is performed. (A) is a perspective view which shows one form of the conventional ultrasonic welding horn, (b) is an enlarged view which shows the bottom face of a horn chip | tip. (A) is principal part sectional drawing of the set state of the electric wire which shows one Embodiment of the ultrasonic bonding method of the conventional electric wire, (b) is a top view which shows the set state of an electric wire.

Explanation of symbols

1 Connecting wire 6A Joint (intersection)
10 One electric wire (electric wire)
10L, 20L Longitudinal direction 20 The other electric wire (electric wire)
30 Tip for ultrasonic welding horn
31 One groove (recess)
31T One straight part (protruding part)
32 Other groove (recess)
32T The other straight part (protruding part)
33 intersecting part 34 convex part 34p inclined surface 35 uneven part (knurl)
35P Concave and convex knurl pattern (Nar pattern)
35T Transferred concavo-convex knurl pattern (Nar pattern)

Claims (1)

One and a circular cross section of the metal wire, and the other of circular section metal wire orthogonal to the one electric wire said, pressed while ultrasonic vibrations between the tip and the anvil for ultrasonic welding horn In the method of joining electric wires to be joined together, the ultrasonic welding horn tip and the anvil each have a substantially quadrangular pyramid-shaped convex portion having four inclined surfaces and arranged in parallel in the XY direction, and adjacent to each other. An approximately V-groove-shaped recess in the XY direction formed by the inclined surfaces facing each other of the protrusion, and the one electric wire is disposed along one of the recesses in the XY direction. along the other of the recess disposed said other wire, the combined cross-section of both the recess in cross-section perpendicular to the both wires, have rows ultrasonic welding, by one of the recesses said, the one One protrusion along the longitudinal direction of the wire in the radial center of the wire Thereby transferring formed by recesses of said other bonding method of the electric wire, which comprises transferring forms the other of the protrusion along the wire longitudinal direction radial center of said other wire.

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