JP6998813B2 - Manufacturing method of terminals, connection structures, wire harnesses and terminals - Google Patents

Description

The present invention relates to a terminal, a connection structure, a wire harness and a method for manufacturing a terminal having a crimping portion that accommodates a conductor portion of an electric wire and can be crimped. Regarding the manufacturing method of terminals.

Conventionally, in order to prevent corrosion of the crimping part between the conductor part and the terminal at the tip of the electric wire, a plate-shaped metal base material is rolled into a tubular shape, and the abutting part or the overlapping part is laser-welded to perform tubular crimping. A crimp terminal has been proposed in which a portion is formed and then one end of the tubular crimp portion is closed by laser welding. As a method for manufacturing such a crimp terminal, for example, when welding the butt portion of the tubular crimp portion, the power density of the laser beam and the laser so that the width dimension of the weld bead formed after welding is 80 μm to 390 μm. It is disclosed to set the sweep rate of light (for example, Patent Document 1).

Further, for the purpose of achieving water stoppage over a long period of time, the tubular crimping portion is provided with at least one molten portion provided so as to penetrate in the thickness direction thereof and formed along the circumferential direction. The terminal is disclosed (for example, Patent Document 2). According to this structure, when the electric wire is crimped to the terminal, the molten portion tends to bulge inward, the adhesion between the inner peripheral surface of the tubular crimping portion and the outer peripheral surface of the electric wire is improved, and the longitudinal length at these interfaces is improved. It is said that the invasion of moisture in the direction can be prevented.

Japanese Patent No. 55988889 Japanese Unexamined Patent Publication No. 2016-0466170

However, when a connection structure is formed by crimping a terminal and an electric wire by press working with an electric wire having a part of the insulating coating stripped inserted in the tubular crimping portion, the tubular crimping portion may be formed depending on the shape of the terminal or the like. There is a part where stress is concentrated. For example, in Patent Document 1, since the tubular crimping portion is a stepped pipe in which the outer diameter of the coated crimping portion and the outer diameter of the conductor crimping portion are different, when the outer peripheral surface of the stepped pipe is pressed during crimping, the angle of the inclined surface is reached. Stress tends to concentrate on the part. If a portion where stress is likely to be locally concentrated is generated in this way, cracks or cracks may occur at the welded portion as a base point during crimping, and the tubular crimping portion may be broken.

Further, in Patent Document 2, in order to prevent water from entering from the other end side of the tubular crimping portion, that is, the wire insertion port side of the coated crimping portion, the coated crimping portion of the tubular crimping portion is subjected to the circumferential direction. Since the molten portion formed along the line is provided, there is a possibility that cracks or cracks may occur at the time of crimping with the welded portion formed in the conductor crimping portion as a base point.

An object of the present invention is to prevent the occurrence of cracks and cracks due to crimping and improve the airtightness of the tubular crimping portion while maintaining the reliability of the electrical connection between the conductor and the terminal by crimping. It is an object of the present invention to provide a terminal, a connection structure, a wire harness, and a method for manufacturing the terminal.

In order to achieve the above object, the terminal of the present invention includes a connector portion provided so as to be connectable to an external terminal, and a tubular crimping portion connected to the connector portion and provided to be crimpable with an electric wire. The tubular crimping portion is provided at a butt portion where the side sides of the metal plate material are butted against each other, and the first bead portion formed along the longitudinal direction of the tubular crimping portion and the first bead portion. It is characterized by including a second bead portion that is provided integrally with the bead portion or is provided separately from the first bead portion and has a width direction dimension larger than the width direction dimension of the first bead portion. do.

The tubular crimping portion includes a coated crimping portion provided so as to be crimpable with an insulating coating of an electric wire, a first inclined portion inclined from the coated crimping portion toward the connector portion side, and the first inclined portion. The first bead has a conductor crimping portion formed on the connector portion side and provided so as to be crimpable to the conductor of the electric wire, and a second inclined portion inclined from the conductor crimping portion toward the connector portion side. It is preferable that the portion is formed in the coated crimping portion, and the second bead portion is formed in the first inclined portion, the conductor crimping portion, and the second inclined portion.

The second bead portion may be provided in the abutting portion integrally with the first bead portion.

Further, the second bead portion may be composed of one linear bead portion continuously formed in the longitudinal direction of the tubular crimping portion.

The one linear bead portion is preferably any one of a wavy bead portion, a chevron-shaped bead portion, a meander-shaped bead portion, and a spiral-shaped bead portion formed without a gap in the longitudinal direction of the tubular crimping portion. ..

Further, the ratio of the bead width of the second bead portion to the bead width of the first bead portion is preferably 1.2 to 6.5.

Further, the bead width of the first bead portion is preferably 80 μm or more and 390 μm or less, and the bead width of the second bead portion is preferably larger than 390 μm.

In the widthwise cross section of the tubular crimping portion in the portion where the first bead portion is formed, the tubular crimping portion has the first bead portion and the first non-welded portion, and the first non-welded portion. The welded portion is composed of a first normal portion and a first annealed portion, and the tubular crimping portion is the first in the widthwise cross section of the tubular crimping portion in the portion where the second bead portion is formed. It has two bead portions and a second non-welded portion, and the second non-welded portion is composed of a second normal portion and a second annealed portion, and the circumferential length of the second annealed portion is increased. It is preferably longer than the circumferential length of the first annealed portion.

Further, the second bead portion may be provided separately from the first bead portion and may be formed so as to intersect with the first bead portion at a plurality of locations.

Further, the second bead portion may be composed of a plurality of linear bead portions formed along the width direction of the tubular crimping portion.

Further, it is preferable that the end portion of the tubular crimping portion on the connector portion side is closed.

In order to achieve the above object, the connection structure of the present invention includes a connector portion provided so as to be connectable to an external terminal and a tubular crimping portion connected to the connector portion and provided so as to be crimpable with an electric wire. It is a connection structure including a terminal having a terminal and an electric wire crimped to the tubular crimping portion of the terminal. The normal processed portion is provided with a strong processed portion formed mainly in the conductor crimping portion by crimping the conductor of the electric wire and the conductor crimping portion of the tubular crimping portion. A first bead portion is formed in a butt portion where the side sides of the plate material are butted against each other and formed along the longitudinal direction of the tubular crimping portion, and the strongly processed portion is integrated with the first bead portion. A second bead portion having a width direction dimension larger than the width direction dimension of the first bead portion is formed.

The tubular crimping portion includes a coated crimping portion crimped with an insulating coating of an electric wire, a first inclined portion inclined from the coated crimping portion toward the connector portion side, and the connector portion side of the first inclined portion. It has a conductor crimping portion formed in the above and crimped to the conductor of the electric wire, and a second inclined portion inclined from the conductor crimping portion toward the connector portion side, and the strongly machined portion has at least one stress. It has a concentrated region, and the at least one stress concentrated region is located at a region corresponding to the first inclined portion, a region corresponding to the conductor crimping portion, and a boundary between the conductor crimping portion and the second inclined portion. It is preferably at least one of the region corresponding to the corner portion and the region corresponding to the second inclined portion.

The second bead portion may be integrally formed with the first bead portion in the abutting portion.

Further, the ratio of the bead width of the second bead portion to the bead width of the first bead portion is preferably 1.1 or more and 6.0 or less.

Further, a wire harness including at least one of the above connection structures may be configured.

In order to achieve the above object, the method for manufacturing a terminal of the present invention includes a connector portion electrically connected to an external terminal and a tubular crimping portion connected to the connector portion and provided so as to be crimpable to an electric wire. It is a method of manufacturing a terminal provided with a process of bending a metal plate material and abutting the side sides of the metal plate material with each other to form a tubular body, and laser welding the abutting portion of the tubular body material. The step of forming a tubular crimping portion while forming a bead portion along the longitudinal direction of the tubular body, and the step of forming the bead portion is a first bead portion having a predetermined width direction dimension. It is characterized by having a step of forming a second bead portion having a width direction dimension larger than the first width dimension.

The step of forming the tubular crimping portion includes an insulating coating of the electric wire, a coated crimping portion provided so as to be crimpable, a first inclined portion inclined from the coated crimping portion toward the connector portion, and the first inclined portion. 1 Cylindrical shape having a conductor crimping portion formed on the connector portion side of the inclined portion and provided so as to be crimpable to the conductor of the electric wire, and a second inclined portion inclined from the conductor crimping portion toward the connector portion side. In the step of forming the crimping portion and forming the bead portion, the first bead portion is formed in the covering crimping portion, and the second bead is formed in the first inclined portion, the conductor crimping portion, and the second inclined portion. It is preferable to form a portion.

Further, the laser may be swept along the longitudinal direction and the width direction of the tubular crimping portion to form the second bead portion composed of one continuously formed linear bead portion. ..

The one linear bead portion is preferably any one of a wavy bead portion, a chevron-shaped bead portion, a meander-shaped bead portion, and a spiral-shaped bead portion formed without a gap in the longitudinal direction of the tubular crimping portion. ..

Further, under the laser conditions of a beam spot diameter of 20 μm or more and 100 μm or less, a laser wavelength of 1.06 μm or more and 1.09 μm or less, an output density of 5 MW / cm ² or more and 40 MW / cm ² or less, and a sweep speed of 90 mm / sec or more and 500 mm / sec or less. A first bead portion is formed, the beam spot diameter is 20 μm or more and 100 μm or less, the laser wavelength is 1.06 μm or more and 1.09 μm or less, the output density is 10 MW / cm ² or more and 200 MW / cm ² or less, and the sweep speed is 70 mm / sec or more and 300 mm / sec or less. It is preferable to form the second bead portion under the laser conditions of.

In order to achieve the above object, the method for manufacturing a terminal of the present invention includes a connector portion electrically connected to an external terminal and a tubular crimping portion connected to the connector portion and provided so as to be crimpable to an electric wire. It is a method of manufacturing a terminal provided with a process of bending a metal plate material and abutting the side sides of the metal plate material with each other to form a tubular body, and laser welding the abutting portion of the tubular body material. A step of forming a tubular crimping portion while forming a first bead portion along the longitudinal direction of the tubular body, and the first bead portion formed along the longitudinal direction of the tubular crimping portion at a plurality of locations. It is characterized by having a step of sweeping a laser so as to intersect with each other to form a second bead portion.

The step of forming the tubular crimping portion includes an insulating coating of the electric wire, a coated crimping portion provided so as to be crimpable, a first inclined portion inclined from the coated crimping portion toward the connector portion, and the first inclined portion. 1 Cylindrical shape having a conductor crimping portion formed on the connector portion side of the inclined portion and provided so as to be crimpable to the conductor of the electric wire, and a second inclined portion inclined from the conductor crimping portion toward the connector portion side. In the step of forming the crimping portion and forming the first bead portion, the first bead portion is formed on the covering crimping portion, the first inclined portion, the conductor crimping portion, and the second inclined portion, and the first bead portion is formed. In the step of forming the two bead portions, it is preferable to form the second bead portion on the first inclined portion, the conductor crimping portion, and the second inclined portion.

The laser may be swept along the width direction of the tubular crimping portion to form the second bead portion composed of a plurality of linear bead portions.

According to the present invention, while maintaining the reliability of the electrical connection between the terminal and the electric wire by crimping, the occurrence of breakage such as cracks and cracks due to crimping is prevented and the airtightness of the tubular crimping portion is improved. be able to.

It is a figure which shows schematic structure of the terminal which concerns on 1st Embodiment of this invention, (a) is the whole perspective view, (b) is a partially enlarged perspective view of a cylindrical crimping portion. (A) is a cross-sectional view in the width direction along the line I-I in the coated crimping portion of the tubular crimping portion of FIG. 1 before crimping, and (b) is the tubular crimping portion of the tubular crimping portion before crimping. It is a cross-sectional view in the width direction along the line II-II in the conductor crimping portion. (A) is a perspective view showing a configuration of a connection structure including a terminal of FIG. 1 and an electric wire connected to a tubular crimping portion of the terminal, (b) is a portion of the connection structure of (a). The plan view and (c) are longitudinal sectional views of the connection structure along the line VV of (b). (A) is a cross-sectional view in the width direction along the line III-III of the coated crimping portion after crimping in FIG. 3A, and FIG. 3B is a line in the conductor crimping portion after crimping in FIG. 3A. It is a cross-sectional view in the width direction along IV-IV. It is a figure which shows the relationship between the laser irradiation position and the laser output at the time of forming the bead portion of the terminal of FIG. It is a partially enlarged perspective view which shows roughly the structure of the terminal which concerns on 2nd Embodiment of this invention. (A) to (d) are partially enlarged perspective views showing a modification of the second bead portion in FIG. It is a perspective view which shows the modification of the terminal of FIG.

1A and 1B are views schematically showing the configuration of a terminal according to the first embodiment of the present invention, where FIG. 1A is an overall perspective view and FIG. 1B is a partially enlarged perspective view of a cylindrical crimping portion. The terminal of FIG. 1 shows an example thereof, and the configuration of each part of the terminal according to the present invention, the shape, dimensions, etc. of each configuration are not limited to those of FIG.

The terminal 1 has a tubular shape that is connected to a connector portion 10 that is electrically connectable to an external terminal (not shown) via a transition portion 20 and is crimpable to an electric wire (not shown). A crimping portion 30 is provided. In the present embodiment, the connector portion 10 and the tubular crimping portion 30 are integrally molded, but a terminal may be manufactured by molding the connector portion and the tubular crimping portion separately and connecting them.

The terminal 1 is made of a metal substrate, and the metal substrate is made of a base material made of a metal material (copper, aluminum, iron, an alloy containing these as a main component, or the like). From the viewpoint of ensuring conductivity and strength, the terminal 1 may have the base material and a plated portion containing the metal formed on the base material as a main component. The plated portion may be provided on a part or all of the base material, and noble metal plating such as tin plating or silver plating is preferable. Further, the plating portion may be further provided with a base plating such as iron (Fe), nickel (Ni), cobalt (Co), or an alloy containing these as a main component.

The connector portion 10 is, for example, a box portion provided so that an insertion tab such as a male terminal can be inserted, and has an accommodation port 11 for accommodating the insertion tab. The shape of the connector portion 10 is not particularly limited, and may have, for example, a long connection portion (insertion tab) of a male terminal. Further, the connector portion 10 may have any shape as long as it can be locked or fitted with an external terminal and electrically connected.

The transition portion 20 is a portion that bridges the connector portion 10 and the tubular crimping portion 30. The transition portion 20 may be formed three-dimensionally or two-dimensionally, but from the viewpoint of mechanical strength against bending in the longitudinal direction of the terminal, the moment of inertia of area in the longitudinal direction is increased. It is preferable to design.

The tubular crimping portion 30 is a tubular member whose end on the connector portion 10 side is closed, and has an opening 31 provided so that an electric wire can be inserted and a covering crimping provided so as to be crimpable with an insulating coating of the electric wire. A conductor formed on the connector portion 10 side of the portion 32, the first inclined portion 33 inclined from the coated crimping portion 32 toward the connector portion 10 side, and the first inclined portion 33, and provided so as to be crimpable to the conductor of the electric wire. It has a crimping portion 34 and a second inclined portion 35 that is inclined from the conductor crimping portion toward the transition portion 20 side.

In the present embodiment, the end portion of the tubular crimping portion 30 on the connector portion 10 side is closed by welding, for example. Specifically, by three-dimensionally pressing a metal substrate developed in a plane, a tubular body having a substantially C-shaped cross section in the width direction is formed, and the open portion (butting portion) of the tubular body is a laser. Will be welded. By this butt welding, a linear or strip-shaped bead portion 40 is formed in a direction substantially the same as the longitudinal direction thereof, and a tubular crimping portion 30 is formed.

It is preferable that the end portion of the tubular crimping portion 30 on the transition portion 20 side is sealed by the end welded portion 50. The end welded portion 50 is formed, for example, along the width direction of the terminal 1. By this sealing, it is possible to prevent moisture or the like from entering the inside of the tubular crimping portion 30 from the transition portion 20 side.

As shown in FIG. 1 (b), the tubular crimping portion 30 is provided at a butt portion where the side sides of the metal plate are butted against each other, and the first bead is formed along the longitudinal direction of the tubular crimping portion 30. The portion 41 is provided integrally with the first bead portion 41, and includes a second bead portion 43 having a width direction dimension larger than the width direction dimension of the first bead portion 41. The first bead portion 41 is formed in the covering crimping portion 32. The second bead portion 43 is formed on the first inclined portion 33, the conductor crimping portion 34, the corner portion 36 located at the boundary between the conductor crimping portion 34 and the second inclined portion 35, and the second inclined portion 35.

In the present embodiment, the second bead portion 43 is provided in the abutting portion integrally with the first bead portion 41. The widthwise dimension of the first bead portion 41 refers to the bead width D1 of the first bead portion 41, and the widthwise dimension of the second bead portion 43 refers to the bead width D2 of the second bead portion 83. The bead width is a perpendicular line to two boundary lines indicating the boundary between the welded portion and the unmelted portion on the outer peripheral surface of the tubular crimping portion 30 among the welded portions resolidified after melting by laser welding. Refers to the length of the line segment of.
The ratio of the bead width D2 of the second bead portion 43 to the bead width D1 of the first bead portion 41 is, for example, 1.2 or more and 6.5 or less.

The bead width D1 of the first bead portion 41 is, for example, 80 μm or more and 390 μm or less from the viewpoint of sufficiently joining the butt portions even after the formation of the weakly compressed portion described later. Further, the bead width D2 of the second bead portion 43 is larger than, for example, 390 μm, preferably larger than 390 μm and 500 μm or less from the viewpoint of sufficiently joining the butt portions even after the formation of the strongly compressed portion described later.

The first bead portion 41 and the second bead portion 43 have the same composition as the tubular crimping portion 30, and are softer than the base material of the tubular crimping portion. The first bead portion 41 and the second bead portion 43 having such properties are formed by, for example, irradiating the tubular crimping portion 30 with laser light from above and melting and solidifying a part of the tubular crimping portion 30. can do.

FIG. 2A is a cross-sectional view in the width direction along the line I-I of the coated crimping portion 32 of the tubular crimping portion 30 of FIG. 1 before crimping, and FIG. 2B is a tubular crimping portion before crimping. It is a cross-sectional view in the width direction along the line II-II in the conductor crimping portion 34 of the portion 30.
As shown in FIG. 2A, in the widthwise cross section of the portion where the first bead portion 41 is formed, for example, the covering crimping portion 32 of the tubular crimping portion 30, the tubular crimping portion 30 is a second welded portion. It has one bead portion 41 and a first non-welded portion 42.

The first bead portion 41 is a portion formed on the metal base material constituting the tubular crimping portion 30 by irradiation with a laser beam during butt welding. The first bead portion 41 is formed by solidifying the metal member (base material and plating portion) once melted by the heat of the laser. The crystal grains of the first bead portion 41 are usually coarser than the crystal grains of the first non-welded portion 42. The plated metal constituting the plated portion may be melted into the first bead portion 41.

The first non-welded portion 42 is composed of a first normal portion 42a and a first annealed portion 42b. However, when the plated portion is formed on the metal substrate, the first non-welded portion 42 is composed of a first normal portion 42a and a first annealed portion 42b with respect to the first bead portion 41 of the metal substrate. Refers to the parts to be formed and the plated parts arbitrarily provided on these surfaces.

The first annealed portion 42b is a portion that has been annealed under the influence of the heat of the laser beam during the butt welding, and is formed on the metal base material on both sides of the first bead portion 41. The first annealed portion 42b refers to a portion having a structure softened more than the terminal base material, and has a hardness of 70 to 90% of the hardness of the first normal portion 42a. The first annealed portion 42b also includes a so-called HAZ (Heat Affected Zone). The first normal portion 42a refers to a portion other than the first bead portion 41 and the first annealed portion 42b in the widthwise cross section of the metal base material of the tubular crimping portion 30.

The hardness of the first normal portion 42a and the first annealed portion 42b can be measured by using a hardness test such as Vickers hardness (Hv). The hardness should be measured by a method conforming to a normal industrial standard (JIS Z 2244 for Vickers hardness) or the like. The hardness of the second normal portion and the second annealed portion, which will be described later, can also be measured by the same method as described above.

Further, as shown in FIG. 2B, in the widthwise cross section of the portion where the second bead portion 43 is formed, for example, the first inclined portion 33 of the tubular crimping portion 30, the tubular crimping portion 30 is a welded portion. It has a second bead portion 43 and a second non-welded portion 44.

Like the first bead portion 41, the second bead portion 43 is a portion formed on the metal substrate constituting the tubular crimping portion 30 by irradiation with a laser beam during butt welding. The second bead portion 43 is formed by solidifying the metal member once melted by the heat of the laser. The crystal grains in the second bead portion 43 are usually coarse in the crystal grains in the second non-welded portion 44. The plated metal constituting the plated portion may be melted into the second bead portion 43.

The second non-welded portion 44 is composed of a second normal portion 44a and a second annealed portion 44b. However, the second non-welded portion 44 is arbitrarily provided on the portion composed of the second normal portion 44a and the second annealed portion 44b with respect to the second bead portion 43 of the metal substrate, and on the surface thereof. Refers to the plated part.

The second annealed portion 44b is a portion that has been annealed under the influence of the heat of the laser beam during the butt welding, and is formed on the metal base materials on both sides of the second bead portion 43. The second annealed portion 44b refers to a portion having a structure softened more than the terminal base material, and has a hardness of 70 to 90% of the hardness of the second normal portion 44a. The second annealed portion 44b also includes a so-called HAZ (Heat Affected Zone). The second normal portion 44a refers to a portion other than the second bead portion 43 and the second annealed portion 44b in the widthwise cross section of the metal base material of the tubular crimping portion 30.

The circumferential length of the second annealed portion 44b is preferably longer than the circumferential length of the first annealed portion 42b. Since the energy received from the laser beam when the second bead portion 43 is formed is relatively larger than the energy received from the laser beam when the first bead portion 41 is formed, the circumferential direction of the second annealed portion 44b. The length becomes larger than the circumferential length of the first annealed portion 42b. Therefore, when the bead width D1 of the second bead portion 43 is larger than the bead width D2 of the first bead portion 41, it is presumed that the circumferential length of the second annealed portion 44b is larger than the circumferential length of the first annealed portion 42b. Will be done.

3A is a perspective view showing the configuration of a connection structure including the terminal 1 of FIG. 1 and an electric wire connected to the tubular crimping portion 30 of the terminal, and FIG. 3B is a connection of FIG. 3A. A partial plan view of the structure, (c) is a longitudinal sectional view of the connecting structure along the line VV of (b). 4 (a) is a cross-sectional view in the width direction along lines III-III of the coated crimping portion 32 after crimping in FIG. 3 (a), and FIG. 4 (b) is a cross-sectional view after crimping in FIG. 3 (a). It is a cross-sectional view in the width direction along the line IV-IV of the conductor crimping portion 34.
As shown in FIGS. 3A to 3C, the connection structure 3 is connected to the connector portion 10 provided so as to be connectable to the external terminal and the connector portion 10, and is provided so as to be crimpable to the electric wire 2. A terminal 1 having a tubular crimping portion 30 and an electric wire 2 crimped to the tubular crimping portion of the terminal are provided. The connection structure 3 includes a normal processing portion 60 formed in the coating crimping portion 32 by crimping the insulating coating 2a of the electric wire 2 and the coating crimping portion 32 of the tubular crimping portion 30, and the conductor 2b and the cylinder of the electric wire 2. It is provided with a strongly machined portion 70 formed mainly on the conductor crimping portion 34 by crimping the shape crimping portion 30 with the conductor crimping portion 34. The size of the electric wire 2 is not particularly limited, but is, for example, 0.5 sq (mm ² ) or more and 12 sq (mm ² ) or less, preferably 5.0 sq (mm ² ) or 8.0 sq (mm ² ).

The above-mentioned normal machined portion refers to a portion where the compressibility of the wire is large, which is represented by the ratio of the cross-sectional area after crimping of the same wire to the cross-sectional area before crimping of the wire, and the compression rate of the wire is 50% or more. The part of 90% or less. The above-mentioned strongly machined portion refers to a portion in which the compressibility of the wire, which is represented by the ratio of the cross-sectional area after crimping of the same wire to the cross-sectional area before crimping of the wire, is smaller than that of the normal machined part. , A portion that is smaller than the compression rate of the wire in the normal machined portion and has a compression rate of 40% or more and 70% or less. The plate thickness of the strongly processed portion 70 is smaller than the plate thickness of the normal processed portion 60.

Since the tubular crimping portion 30 has a stepped shape, when the insulating coating at the end of the electric wire 2 is removed and the end thereof is inserted into the tubular crimping portion 60, the insulating coating 2a of the electric wire becomes the first inclined portion 33. The insulating coating 2a is located directly under the coating crimping portion 32, and the conductor 2b is located directly under the conductor crimping portion 34. Therefore, the positioning of the end portion of the electric wire 2 can be easily performed, and the crimping between the covering crimping portion 32 and the insulating coating 2a and the crimping between the conductor crimping portion 34 and the conductor 2b are surely performed.

The normal processing portion 60 is provided with a butt portion in which the side sides of the metal plate material are butted against each other, and a first bead portion 41 formed along the longitudinal direction of the tubular crimping portion 30 is formed (FIG. 3 (FIG. 3). a), FIG. 4 (a)). The normal processing portion 60 is formed by crimping the covering crimping portion 32 in the vertical direction using, for example, a pair of dies.
The hard-worked portion 70 has a plurality of stress concentration regions 70a, 70b, 70c, and 70d (FIG. 3 (b)). In the present embodiment, the stress concentration region 70a is a region corresponding to the first inclined portion 33 of the terminal 1 before crimping, and the stress concentration region 70b is a region corresponding to the conductor crimping portion 34 of the terminal 1 before crimping. be. Further, the stress concentration region 70c is a region corresponding to the corner portion 36 located at the boundary between the conductor crimping portion 34 of the terminal 1 before crimping and the second inclined portion 35, and the stress concentration region 70d is the terminal before crimping. It is a region corresponding to the second inclined portion 35 of 1.

In the present embodiment, the second bead is provided integrally with the first bead portion 41 in each of the strongly machined portions 70, particularly the stress concentration regions 70a to 70d, and has a bead width larger than the bead width of the first bead portion 41. The portion 43 is formed. As shown in FIG. 3C, the hard-worked portion 70 is formed by pressing the conductor crimping portion 34 and the second inclined portion 35 from above using a mold 200 having a predetermined tooth mold shape. .. In the connection structure 3, the ratio of the bead width of the second bead portion 43 to the bead width of the first bead portion 41 is, for example, 1.1 or more and 6.0 or less.

When the conductor crimping portion 34 and the second inclined portion 35 are pressed by the mold 200, stress concentration is likely to occur in the conductor crimping portion 34, the second inclined portion 35 or the vicinity thereof, and in particular, the corner portion 201 of the mold 200, At the portion where the 202 abuts, cracks and shock lines due to strong machining are likely to be formed. Further, when the tubular crimping portion 30 has a stepped shape, stress is concentrated on the first inclined portion 33 arranged corresponding to the stepped portion between the insulating coating 2a and the conductor 2b when crimping the terminal 1 and the electric wire 2. Is generated, and cracks are likely to occur in the first inclined portion 33. Further, when the conductor crimping portion 34 and the second inclined portion 35 are pressed by the mold 200, stress concentration is likely to occur in the corner portion 36 located at the boundary between the conductor crimping portion 34 and the second inclined portion 35, and the corner portion Cracks are likely to occur in 36.

Therefore, by forming the second bead portion 43, which is wider than the first bead portion 41, in the conductor crimping portion 34, the conductor crimping portion 34 is easily plastically deformed during crimping (improvement of ductility), and in particular, the mold. Cracks are less likely to occur at the shock lines formed at the portions where the corners 201 and 202 of the 200 abut, and the occurrence of cracks in the stress concentration regions 70b and 70d of the conductor crimping portion 34 and the second inclined portion 35 is suppressed. Can be done.

Further, when the tubular crimping portion 30 has a stepped shape as in the present embodiment, by forming the second bead portion 43 on the first inclined portion 33, the first inclined portion 33 is plastically deformed at the time of crimping. This facilitates the occurrence of cracks in the stress concentration region 70a corresponding to the first inclined portion 33.
Further, by forming the second bead portion 43 at the corner portion 36 located at the boundary between the conductor crimping portion 34 and the second inclined portion 35, the corner portion 36 is easily plastically deformed at the time of crimping, and the corner portion 36 is easily formed. It is possible to prevent the occurrence of cracks in the stress concentration region 70c corresponding to (FIG. 4 (b)).

Next, a method of manufacturing the terminal 1 according to the present embodiment will be described. The manufacturing method described later shows an example of the manufacturing method according to the embodiment of the present invention, and the manufacturing method according to the present invention is not limited to this.

First, a plate material made of copper or a copper alloy or a metal substrate of aluminum or an aluminum alloy is rolled to produce a plate material having a thickness of 0.2 mm to 1.0 mm, for example, a plate material having a thickness of 0.4 mm. If necessary, a plating layer is provided on the entire plate material made of the base material to form a metal substrate, or a plating layer is provided on an arbitrary portion in a state where the plate material made of the base material is masked to form a metal substrate. The plating layer is provided by a plating process, and examples of the material of the plating layer include tin, silver, and gold plating.

This metal substrate is punched in a repeating shape by press working (primary press) so that a plurality of crimp terminals are expanded in a plane. In this press working, a so-called cantilever type object to be processed is produced, in which each object to be processed is supported by one end. After the present press working, a plating layer may be provided on the base material to form a metal substrate. That is, plating may be performed after press working.

Next, each plate-shaped portion, which is a constituent unit of the repeating shape, is bent (secondary press), and the side sides of the metal plate material are abutted against each other to form a tubular body. At this time, the cross section perpendicular to the longitudinal direction of the crimping portion tubular body has a substantially C-shape with a very small gap. The sides of the substrate that pass through this gap are called abutting portions. As a result, the connector portion and the tubular body for the crimping portion for forming the tubular crimping portion are formed.

After that, the butt portion of the crimping portion tubular body is laser welded to form the tubular crimping portion while forming the bead portion along the longitudinal direction of the crimping portion tubular body. As a result, the butt portion is welded and the tubular crimping portion 30 is formed. This laser welding is performed, for example, using a fiber laser. By using a laser welder that can adjust the focal position during welding in three dimensions, it is possible to weld the inclined portion of the tubular body in three dimensions.

The steps for forming the bead portion include the step of forming the first bead portion 41 having the bead width D1 (predetermined width direction dimension) and the bead width D2 (width direction dimension) larger than the first bead width D1. It has a step of forming the second bead portion 43 having the above. When the tubular crimping portion 30 has a stepped shape as in the above embodiment, in the step of forming the bead portion, for example, the first bead portion 41 is formed in the covering crimping portion 32, and then the first bead portion is formed. A second bead portion 43 is formed on the inclined portion 33, the conductor crimping portion 34, and the second inclined portion 35.

The laser conditions for forming the first bead portion 41 are, for example, a beam spot diameter of 20 μm or more and 100 μm or less, a laser wavelength of 1.06 μm or more and 1.09 μm or less, an output density of 5 MW / cm ² or more and 40 MW / cm ² or less, and a sweep speed. It is 90 mm / sec or more and 500 mm / sec or less. The laser conditions for forming the second bead portion 43 are, for example, a beam spot diameter of 20 μm or more and 100 μm or less, a laser wavelength of 1.06 μm or more and 1.09 μm or less, and an output density of 10 MW / cm ² or more and 200 MW / cm ² or less. It is preferably 40 MW / cm ² or more and 180 MW / cm ² or less, and a sweep speed of 70 mm / sec or more and 300 mm / sec or less.

FIG. 5 is a diagram showing the relationship between the laser irradiation position and the laser output when the bead portion 40 of the terminal 1 of FIG. 1 is formed.
When forming the bead portion 40, for example, the laser beam is irradiated from above the cylindrical body for the crimping portion, and the laser beam is swept along the abutting portion from the A position to the E position in the drawing. At this time, the laser output is lowered at the position corresponding to the covering crimping portion 32 (between AB in the figure), and at the position corresponding to the first inclined portion 33, the conductor crimping portion 34 and the second inclined portion 35 (in the figure). It is preferable to increase the laser output relatively (between BC, between CD, and part of between DE). By controlling the output waveform according to the laser irradiation position in this way, it is possible to form the second bead portion 43 having a bead width D2 wider than the bead width D1.

As another method for forming the second bead portion 43, for example, when the material of the metal substrate is made of a base material made of copper or a copper alloy, the first inclined portion 33, the conductor crimping portion 34, and the first The focus shift can be performed at the position corresponding to the two inclined portions 35, and the beam spot can be intentionally defocused to make the beam spot relatively large within the above range. The second bead portion 43 can also be formed by relatively reducing the sweep speed of the laser beam at the target position. In addition, by using a diffractive optical element, the second bead portion 43 having a bead width D2 wider than the bead width D1 can be formed by changing the profile of the power density of the laser beam L. ..

Next, the end of the tubular crimping portion 30 on the transition portion 20 side (the end on the opposite side of the opening 31) is sealed by welding. This encapsulation is performed by sweeping the laser beam in the width direction of the terminal, and sweeping the laser beam in a direction intersecting the longitudinal direction of the terminal (longitudinal direction of the cylindrical crimping portion 30), for example, in a direction perpendicular to the terminal. It is done by doing. This welding is performed by irradiating the folded portion of the metal base material (or metal member) with a laser beam from above the folded portion. By this sealing, the end welded portion 50 extending along the width direction of the tubular crimping portion 30 is formed, and the end portion of the tubular crimping portion 30 on the transition portion 20 side is closed.

As described above, according to the present embodiment, the terminal 1 is provided at the abutting portion where the side sides of the metal plate material are butted against each other, and the first bead portion formed along the longitudinal direction of the tubular crimping portion 30. Since the 41 and the second bead portion 43 provided integrally with the first bead portion 41 and having a width direction dimension larger than the width direction dimension of the first bead portion 41 are provided, they may exist at the time of crimping with the electric wire 1. By arranging the wide second bead portion 43 at or near the stress concentration portion, the baked second bead portion 43 is plastically deformed at the time of crimping, so that the deformation followability of the tubular crimping portion 30 is improved. However, the stress applied to the second bead portion 43 can be relaxed, and the occurrence of breakage such as cracks and cracks can be prevented. Therefore, while maintaining the reliability of the electrical connection between the terminal 1 and the electric wire 2 by crimping, it is possible to prevent the occurrence of breakage such as cracks and cracks due to crimping and improve the airtightness of the tubular crimping portion 30. Can be done.

Further, when the tubular crimping portion 30 has a stepped shape, the first bead portion 41 is formed in the covering crimping portion 32, and the second bead portion 43 is the first inclined portion 33, the conductor crimping portion 34, and the second. Since it is formed on the inclined portion 35, it is possible to prevent the occurrence of cracks, cracks, and the like at places where stress is likely to be concentrated during crimping.

Further, since the second bead portion 43 is provided at the butt portion integrally with the first bead portion 41, the second bead portion exhibits a stress concentration relaxing action by sweeping the laser beam once in the welding process. 43 can be formed, and the manufacturing efficiency can be improved.

Further, since the ratio of the bead width D2 of the second bead portion 43 to the bead width D1 of the first bead portion 41 is 1.2 or more and 6.5 or less, the occurrence of breakage at a place where stress concentration is likely to occur is further prevented. can do.

Further, the first non-welded portion 42 is composed of a first normal portion 42a and a first annealed portion 42b, and the second non-welded portion 44 includes a second normal portion 44a and a second annealed portion 44b. Since the circumferential length of the second annealed portion 44b is longer than the circumferential length of the first annealed portion 42b, the relatively soft second annealed portion 44b is formed over a wide range in the circumferential direction. Since the second annealed portion 44b is plastically deformed during crimping, the deformation followability of the tubular crimping portion 30 is further improved, and the occurrence of breakage such as cracks and cracks can be further prevented.

FIG. 6 is a partially enlarged perspective view schematically showing the configuration of the terminal according to the second embodiment of the present invention. In the second embodiment, the configuration of the second bead portion is different from the configuration of the second bead portion of the first embodiment, and the configurations other than the second bead portion are the same as the terminal configuration according to the first embodiment. Since they are the same, the main differences will be explained below.

As shown in FIG. 6, the tubular crimping portion 30 of the terminal 1 is provided at a butt portion where the side sides of the metal plate material are butted against each other, and a first bead formed along the longitudinal direction of the tubular crimping portion 30. The portion 81 is provided separately from the first bead portion 81, and includes a second bead portion 83 having a width direction dimension larger than the width direction dimension of the first bead portion 81. The first bead portion 81 is formed on the covering crimping portion 32, the first inclined portion 33, the conductor crimping portion 34, and the second inclined portion 35, and the second bead portion 83 is formed on the first inclined portion 33, the conductor crimping portion 34, and the second inclined portion 35. It is formed on the second inclined portion 35.

The second bead portion 83 is composed of a plurality of linear bead portions 83a, 83b-1, 83b-2, 83c-1, 83c-2 formed along the width direction of the tubular crimping portion 30. .. The linear bead portion 83a is arranged on the first inclined portion 33, the linear bead portions 83b-1 and 83b-2 are arranged on the conductor crimping portion 34, and the linear bead portions 83c-1 and 83c-2 are arranged on the second inclined portion. It is arranged in the section 35.

In the present embodiment, the second bead portion 83 is provided separately from the first bead portion 81, and is formed so as to intersect with the first bead portion 81 at a plurality of locations. The width direction dimension of the first bead portion 81 refers to the bead width D1'of the first bead portion 81, and the width direction dimension of the second bead portion 83 is the second bead portion with respect to the width direction of the tubular crimping portion 30. Refers to dimension D2'of 83.
The ratio of the dimension D2'of the second bead portion 83 with respect to the width direction of the tubular crimping portion 30 to the bead width D1'of the first bead portion 41 is 1.2 or more. The bead width D1'of the first bead portion 41 is, for example, 80 μm or more and 390 μm or less. The dimension D2'of the second bead portion 83 is, for example, larger than 390 μm, preferably larger than 390 μm and 6 mm or less.

When manufacturing the terminal 1, first, in the same manner as in the first embodiment, after pressing (primary pressing), each plate-shaped portion, which is a constituent unit of the repeating shape, is bent (secondary pressing). ), The sides of the metal plate are abutted against each other to form a tubular body.

Next, the butt portion of the crimping portion cylindrical body is laser-welded, and the first bead portion 81 is formed along the longitudinal direction of the crimping portion tubular body over the entire longitudinal direction of the crimping portion tubular body. While forming, the tubular crimping portion 30 is formed.

After that, the laser is swept so as to intersect the first bead portion 81 formed along the longitudinal direction of the tubular crimping portion 30 at a plurality of points, and the linear bead portions 83a, 83b-1, 83b-2, 83c are swept. -1,83c-2 is formed. For example, when forming the linear bead portions 83a, 83b-1, 83b-2, 83c-1, 83c-2, the laser is swept a plurality of times along the width direction of the tubular crimping portion 30, preferably the first. The laser is swept a plurality of times in a direction perpendicular to the longitudinal direction of the bead portion 81.
The laser sweep direction when forming the linear bead portions 83a, 83b-1, 83b-2, 83c-1, 83c-2 is not limited to the direction perpendicular to the longitudinal direction of the first bead portion 81, and is not limited to the direction perpendicular to the longitudinal direction of the first bead portion 81. 1 The laser may be swept in a direction inclined with respect to the longitudinal direction of the bead portion 81. Further, the laser may be swept a plurality of times with the same inclination with respect to the longitudinal direction of the first bead portion 81, or the laser may be swept a plurality of times with a different inclination.

Next, the end of the tubular crimping portion 30 on the transition portion 20 side (the end on the opposite side of the opening 31) is sealed by welding (see FIG. 1). By this sealing, the end welded portion 50 extending along the width direction of the tubular crimping portion 30 is formed, and the end portion of the tubular crimping portion 30 on the transition portion 20 side is closed.

According to the present embodiment, the terminal 1 is provided at the abutting portion where the side sides of the metal plate material are butted against each other, and the first bead portion 81 formed along the longitudinal direction of the tubular crimping portion 30 and the first. Since the bead portion 81 is provided separately from the bead portion 81 and the second bead portion 83 having a width direction dimension larger than the width direction dimension of the first bead portion 81 is provided, the stress concentration portion that may exist at the time of crimping with the electric wire 1 or By arranging the second bead portion 83 in the vicinity thereof, the baked second bead portion 83 is plastically deformed at the time of crimping, so that the deformation followability of the tubular crimping portion 30 is improved and the second bead portion is formed. The stress applied to the 83 can be relaxed, and the occurrence of breakage such as cracks and cracks can be prevented.
Further, since the second bead portion 83 is provided separately from the first bead portion 81, the second bead portion 83 can be formed in a portion other than the butt portion, and the second bead portion 83 can be freely formed in a position. The second bead portion 83 can be locally and appropriately formed at one or more sites where the degree of freedom increases and stress concentration can occur.

In the second embodiment, the second bead portion 83 is composed of a plurality of linear bead portions formed along the width direction of the tubular crimping portion 30, but the second bead portion is not limited to this. However, it may be composed of one linear bead portion continuously formed in the longitudinal direction of the tubular crimping portion 30.

For example, as shown in FIG. 7, the second bead portion 84 has a wavy bead portion 84a (FIG. 7 (a)) and a chevron-shaped bead portion 84b (FIG. 7 (a)) in which the second bead portion 84 is formed without a gap in the longitudinal direction of the tubular crimping portion 30. 7 (b)), the meander-shaped bead portion 84c (FIG. 7 (c)), or the spiral-shaped bead portion 84d (FIG. 7 (d)) may be used. The first bead portion 81 is formed in the covering crimping portion 32, the first inclined portion 33, the conductor crimping portion 34, and the second inclined portion 35 as in the second embodiment, and the second bead portion 83 is the first inclined portion. It is formed in the portion 33, the conductor crimping portion 34, and the second inclined portion 35.

The first bead portion 81 is provided at a butt portion where the side sides of the metal plate material are butted against each other, and is formed along the longitudinal direction of the tubular crimping portion 30. Further, the second bead portion 83 is integrally provided with the first bead portion 41 and is provided in the butt portion or in a region including the butt portion.

The widthwise dimension of the first bead portion 81 refers to the bead width D1'of the first bead portion 81 (see FIG. 5), and the widthwise dimension of the second bead portion 84 is the width direction of the tubular crimping portion 30. Refers to the dimension D2 of the second bead portion 84 with respect to.
The ratio of the circumferential direction D2'of the second bead portion 83 to the bead width D1'of the first bead portion 41 is 1.2 to 6.5. The bead width D1'of the first bead portion 41 is, for example, 80 μm or more and 390 μm or less. The dimension D2 "of the second bead portion 83 is, for example, larger than 390 μm, preferably larger than 390 μm and 500 μm or less.

When manufacturing the terminal of FIG. 7, the first bead portion 81 is formed on the covering crimping portion 32 as in the first embodiment, and then the first inclined portion 33, the conductor crimping portion 34, and the second inclined portion 35 are formed. A second bead portion 84 is formed on the surface. At this time, the laser is swept along the longitudinal direction and the width direction of the tubular crimping portion 30 to form a second bead portion 84 composed of one continuously formed linear bead portion.

Also in this modification, since the terminal 1 is provided integrally with the first bead portion 81 and includes the second bead portion 84 having a width direction dimension larger than the width direction dimension of the first bead portion 41, the terminal 1 and the electric wire 1 By arranging the second bead portion 84 at or near the stress concentration portion that may exist at the time of crimping, the baked second bead portion 84 is plastically deformed at the time of crimping, so that the tubular crimping portion 30 is deformed. The followability is improved, the stress applied to the second bead portion 84 can be relaxed, and the occurrence of breakage such as cracks and cracks can be prevented.
Further, since the one linear bead portion is a wave-shaped bead portion 84a, a mountain-shaped bead portion 84b, a meander-shaped bead portion 84c, or a spiral-shaped bead portion 84d, the laser conditions for forming the first bead portion 81. The second bead portion 84 can be formed by controlling the sweep direction of the laser beam using the same or the same laser conditions as above, and the second bead portion 84 can be easily formed.

Although the terminals and the manufacturing methods thereof according to the above-described embodiments have been described above, the present invention is not limited to the described embodiments, and various modifications and modifications can be made based on the technical idea of the present invention.
For example, in the above embodiment, the terminal 1 includes the connector portion 10 which is a box portion, but as shown in FIG. 8, the terminal 4 may include the connector portion 90 which is a round terminal portion. Further, in the above embodiment, the terminal 1 has a closed barrel type tubular crimping portion 30, but as shown in FIG. 8, the terminal 4 is connected to the connector portion and is provided so as to be crimpable to the electric wire. It may have a crimping portion 100 of the mold. The crimping portion 100 is a tubular member having an open end on the connector portion 90 side.

In this case, the crimping portion 100 is provided at the abutting portion where the side sides of the metal plate material are butted against each other, and is integrated with the first bead portion 101 formed along the longitudinal direction of the crimping portion 100 and the first bead portion 101. It is provided with a second bead portion 103 having a width direction dimension larger than the width direction dimension of the first bead portion 101. The width direction dimension of the first bead portion 101 is the bead width of the first bead portion 101, and the width direction dimension of the second bead portion 103 is the bead width of the second bead portion 103. Also with this configuration, it is possible to prevent the occurrence of breakage such as cracks and cracks due to crimping while maintaining the reliability of the electrical connection between the terminal 4 and the electric wire 2 by crimping.

Further, in the above embodiment, the strongly machined portion 70 has a plurality of stress concentration regions 70a, 70b, 70c, 70d, but is not limited to this, and may have at least one stress concentration region. At this time, the at least one stress concentration region is a region corresponding to the first inclined portion 33, a region corresponding to the conductor crimping portion 34, and a corner portion 36 located at the boundary between the conductor crimping portion 34 and the second inclined portion 35. It is preferable that the region corresponds to at least one of the region corresponding to the second inclined portion 35 and the region corresponding to the second inclined portion 35.

Further, in the above embodiment, the terminal and the connection structure having the terminal and the electric wire have been described, but the present invention is not limited to this, and a wire harness including at least one of the connection structures may be configured.

1 Terminal 2 Wire 2a Insulation coating 2b Conductor 3 Connection structure 4 Terminal 10 Connector part 11 Storage port 20 Transition part 30 Cylindrical crimping part 31 Opening part 32 Covering crimping part 33 First inclined part 34 Conductor crimping part 35 Second inclined part 41 1st bead part 42 1st non-welded part 42a 1st normal part 42b 1st annealed part 43 2nd bead part 44 2nd non-welded part 44a 2nd normal part 44b 2nd annealed part 50 end welded part 60 normal processing Part 70 Strongly machined part 70a Stress concentration area 70b Stress concentration area 70c Stress concentration area 70d Stress concentration area 81 1st bead part 83 2nd bead part 83a Linear bead part 83b-1 Linear bead part 83b-2 Linear bead part 83c-1 Linear bead part 83c-2 Linear bead part 84 Second bead part 84a Wave-shaped bead part 84b Tooth-shaped bead part 84c Mianda-shaped bead part 84d Spiral-shaped bead part 90 Connector part 100 Crimping part 101 First bead part 103 2nd bead part D1 bead width D2 bead width D1'bead width D2' dimension D2 "dimension 200 mold 201 square part 202 corner part

Claims (24)

A terminal including a connector portion provided so as to be connectable to an external terminal and a cylindrical crimping portion connected to the connector portion and provided so as to be crimpable with an electric wire.
The cylindrical crimping portion is
A first bead portion provided at a butt portion where the side sides of the metal plate material are butted against each other and formed along the longitudinal direction of the tubular crimping portion.
The first bead portion is continuously provided along the longitudinal direction of the tubular crimping portion, or is provided so as to intersect the first bead portion along the width direction of the tubular crimping portion . A second bead portion having a width direction dimension larger than the width direction dimension of the bead portion,
A terminal characterized by being equipped with. The tubular crimping portion includes a coated crimping portion provided so as to be crimpable with an insulating coating of an electric wire, a first inclined portion inclined from the coated crimping portion toward the connector portion side, and the first inclined portion. It has a conductor crimping portion formed on the connector portion side and provided so as to be crimpable to the conductor of the electric wire, and a second inclined portion inclined from the conductor crimping portion toward the connector portion side.
The first bead portion is formed on the coated crimping portion, and the first bead portion is formed.
The terminal according to claim 1, wherein the second bead portion is formed on the first inclined portion, the conductor crimping portion, and the second inclined portion. The terminal according to claim 1 or 2, wherein the second bead portion is provided in the abutting portion continuously with the first bead portion along the longitudinal direction of the tubular crimping portion . The terminal according to claim 3, wherein the second bead portion is composed of one linear bead portion continuously formed in the longitudinal direction of the tubular crimping portion. The terminal according to claim 4, wherein the one linear bead portion is any one of a wavy bead portion, a mountain-shaped bead portion, a meander-shaped bead portion, and a spiral-shaped bead portion. The terminal according to any one of claims 3 to 5, wherein the ratio of the bead width of the second bead portion to the bead width of the first bead portion is 1.2 or more and 6.5 or less. The bead width of the first bead portion is 80 μm or more and 390 μm or less.
The terminal according to any one of claims 3 to 6, wherein the bead width of the second bead portion is larger than 390 μm. In the widthwise cross section of the tubular crimping portion in the portion where the first bead portion is formed, the tubular crimping portion has the first bead portion and the first non-welded portion.
The first non-welded portion is composed of a first normal portion and a first annealed portion.
In the widthwise cross section of the tubular crimping portion in the portion where the second bead portion is formed, the tubular crimping portion has the second bead portion and the second non-welded portion.
The second non-welded portion is composed of a second normal portion and a second annealed portion.
The terminal according to any one of claims 2 to 7, wherein the circumferential length of the second annealed portion is longer than the circumferential length of the first annealed portion. 2. The second bead portion is provided so as to intersect the first bead portion along the width direction of the tubular crimping portion, and is formed so as to intersect the first bead portion at a plurality of locations. Described terminal. The terminal according to claim 9, wherein the second bead portion is composed of a plurality of linear bead portions formed along the width direction of the tubular crimping portion. The terminal according to any one of claims 1 to 10, wherein the end portion of the tubular crimping portion on the connector portion side is closed. A terminal having a connector portion provided so as to be connectable to an external terminal, and a cylindrical crimping portion connected to the connector portion and provided so as to be crimpable with an electric wire.
The electric wire crimped to the tubular crimping part of the terminal and
It is a connection structure provided with
A normal processed portion formed in the coated crimping portion by crimping the insulating coating of the electric wire and the covering crimping portion of the tubular crimping portion, and
It is provided with a strongly processed portion formed mainly in the conductor crimping portion by crimping the conductor of the electric wire and the conductor crimping portion of the tubular crimping portion.
The normal processed portion is provided with a butt portion in which the side sides of the metal plate material are butted against each other, and a first bead portion formed along the longitudinal direction of the tubular crimping portion is formed.
The strongly machined portion is provided continuously with the first bead portion along the longitudinal direction of the tubular crimping portion, or intersects with the first bead portion along the width direction of the tubular crimping portion. A connection structure provided, wherein a second bead portion having a width direction dimension larger than the width direction dimension of the first bead portion is formed. The tubular crimping portion includes a coated crimping portion crimped with an insulating coating of an electric wire, a first inclined portion inclined from the coated crimping portion toward the connector portion side, and the connector portion side of the first inclined portion. It has a conductor crimping portion formed in the above and crimped to the conductor of the electric wire, and a second inclined portion inclined from the conductor crimping portion toward the connector portion side.
The strongly machined portion has at least one stress concentration region.
The at least one stress concentration region corresponds to a region corresponding to the first inclined portion, a region corresponding to the conductor crimping portion, and a region corresponding to a corner portion located at a boundary between the conductor crimping portion and the second inclined portion. The connection structure according to claim 12, which is at least one of the regions corresponding to the second inclined portion. The connection structure according to claim 12 or 13, wherein the second bead portion is formed in the abutting portion continuously with the first bead portion along the longitudinal direction of the tubular crimping portion . The connection structure according to claim 14, wherein the ratio of the bead width of the second bead portion to the bead width of the first bead portion is 1.1 or more and 6.0 or less. A wire harness including at least one connection structure according to any one of claims 12 to 15. A method for manufacturing a terminal including a connector portion electrically connected to an external terminal and a cylindrical crimping portion connected to the connector portion and provided so as to be crimpable to an electric wire.
A process of bending a metal plate material and abutting the sides of the metal plate material against each other to form a tubular body.
It has a step of laser welding the butt portion of the tubular body and forming a tubular crimping portion while forming a bead portion along the longitudinal direction of the tubular body.
The step of forming the bead portion includes a step of forming a first bead portion having a predetermined width direction dimension, a step of forming a second bead portion having a width direction dimension larger than the first width direction dimension, and a step of forming the second bead portion.
A method for manufacturing a terminal, which comprises. The step of forming the tubular crimping portion includes an insulating coating of the electric wire, a coated crimping portion provided so as to be crimpable, a first inclined portion inclined from the coated crimping portion toward the connector portion, and the first inclined portion. 1 Cylindrical shape having a conductor crimping portion formed on the connector portion side of the inclined portion and provided so as to be crimpable to the conductor of the electric wire, and a second inclined portion inclined from the conductor crimping portion toward the connector portion side. Form a crimping part,
In the step of forming the bead portion, the first bead portion is formed in the coated crimping portion, and the second bead portion is formed in the first inclined portion, the conductor crimping portion, and the second inclined portion. Item 17. The method for manufacturing a terminal according to Item 17. 17. The method of manufacturing the terminal described. The method for manufacturing a terminal according to claim 19, wherein the one linear bead portion is any one of a wavy bead portion, a chevron-shaped bead portion, a meander-shaped bead portion, and a spiral-shaped bead portion. The first is under the laser conditions of a beam spot diameter of 20 μm or more and 100 μm or less, a laser wavelength of 1.06 μm or more and 1.09 μm or less, an output density of 5 MW / cm ² or more and 40 MW / cm ² or less, and a sweep speed of 90 mm / sec or more and 500 mm / sec or less. Form a bead and
The second is under the laser conditions of a beam spot diameter of 20 μm or more and 100 μm or less, a laser wavelength of 1.06 μm or more and 1.09 μm or less, an output density of 10 MW / cm ² or more and 200 MW / cm ² or less, and a sweep speed of 70 mm / sec or more and 300 mm / sec or less. The method for manufacturing a terminal according to any one of claims 17 to 20, which forms a bead portion. A method for manufacturing a terminal including a connector portion electrically connected to an external terminal and a cylindrical crimping portion connected to the connector portion and provided so as to be crimpable to an electric wire.
A process of bending a metal plate material and abutting the sides of the metal plate material against each other to form a tubular body.
A step of laser welding the butt portion of the tubular body to form a tubular crimping portion while forming a first bead portion along the longitudinal direction of the tubular body.
A step of sweeping a laser so as to intersect the first bead portion formed along the longitudinal direction of the tubular crimping portion at a plurality of points to form a second bead portion.
A method for manufacturing a terminal, which comprises. The step of forming the tubular crimping portion includes an insulating coating of the electric wire, a coated crimping portion provided so as to be crimpable, a first inclined portion inclined from the coated crimping portion toward the connector portion, and the first inclined portion. 1 Cylindrical shape having a conductor crimping portion formed on the connector portion side of the inclined portion and provided so as to be crimpable to the conductor of the electric wire, and a second inclined portion inclined from the conductor crimping portion toward the connector portion side. Form a crimping part,
In the step of forming the first bead portion, the first bead portion is formed on the covering crimping portion, the first inclined portion, the conductor crimping portion, and the second inclined portion.
22. The method for manufacturing a terminal according to claim 22, wherein the step of forming the second bead portion is to form the second bead portion on the first inclined portion, the conductor crimping portion, and the second inclined portion. The method for manufacturing a terminal according to claim 22 or 23, wherein the laser is swept along the width direction of the tubular crimping portion to form the second bead portion composed of a plurality of linear bead portions.

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