JP2014182874A - Connection structure of aluminum wire, and manufacturing method for splice part with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a novel aluminum wire connection structure which can be simply structured and easily manufactured and is capable of surely securing stability in connection of aluminum wires and a strength of a splice part, and an appropriate manufacturing method thereof.SOLUTION: In a cap terminal 20, an opening of one end portion 24 is crushed in a flat shape and sealed in an axis perpendicular direction and, on the other hand, an opening 28 of another end portion 26 is opened. A core wire 30 of an aluminum wire 10 is inserted from a side of the opening 28 of the other end portion 26 of the cap terminal 20 to the one end portion 24, and the cap terminal 20 is crimped to the aluminum wire 10 in the state where the side of the one end portion 24 is compressed in the axis perpendicular direction with higher compressibility than that at the side of the other end portion 26. Therefore, a high compression part 34 is provided where the core wire 30 of the aluminum wire 10 is mutually crimped with a high crimping force at the side of the one end portion 24, and a low compression part 36 is provided where the aluminum wires 10 are mutually crimped with a lower crimping force than that of the high compression part 34 at the side of the other end portion 26.

Description

  The present invention relates to a connection structure when a plurality of electric wires constituting a wire harness are connected to form a splice part, and particularly relates to an aluminum electric wire connection structure and a method of manufacturing a splice part having the connection structure. It is.

  Conventionally, in a wire harness mounted on a vehicle such as an automobile, when it is necessary to connect each other between a plurality of electric wires, the insulation coating of each electric wire is peeled off to expose the core wires, and the core wire portions are bundled to connect terminals The splice portion is configured by being crimped to each other or connected to each other by resistance welding, ultrasonic welding, or the like. For example, a connection structure described in Japanese Patent Laid-Open No. 2002-43010 (Patent Document 1) is widely adopted.

  By the way, in recent years, for the purpose of reducing the weight of the vehicle and the like, there is a case in which a so-called aluminum electric wire whose core wire is made of an aluminum-based material is used instead of a so-called copper electric wire whose core wire is made of a copper-based material. It is increasing. Therefore, when configuring the splice part in the wire harness, there is a case where the core wires of the aluminum electric wires need to be connected to each other.

  However, when trying to connect the cores of aluminum wires to each other, in order to cope with the unique problem that an oxide film is likely to be formed on the core wires of the aluminum wires, the core wires of the aluminum wires are subjected to high pressure during welding. It was necessary to crimp each other and break the oxide film on the core wire of the aluminum electric wire. However, the resistance welding method widely used for connecting the core wires of copper wires has a problem that the core wires of the aluminum wires stick to the electrodes for resistance welding under high pressure. Therefore, the workability is poor and the cost is increased due to an increase in the frequency of electrode replacement, which is not suitable for mass production. Moreover, if too high pressure is applied to the core wire in order to break the oxide film, the core wire is easily broken, and the strength of the splice portion cannot be secured.

  Therefore, as described in Japanese Patent Application Laid-Open No. 2010-9794 (Patent Document 2), a method called fusing (heat caulking) has been proposed. According to this method, first, the core wire of the aluminum electric wire is heated by passing a current through the electrode for resistance welding in a no-pressure state. After heating, flux is introduced into the core wire of the aluminum electric wire to remove the oxide film on the core wire of the aluminum electric wire. Subsequently, core wires of the aluminum electric wires are connected to each other by introducing solder.

  However, since it is necessary to crimp and fix the core wire of the aluminum wire to the crimp terminal before fusing, and during fusing it is necessary to add flux and solder in addition to heating, there are many work processes. There was a problem in terms of cost. In addition, since flux and solder are used, there is a problem in terms of environmental load.

JP 2002-43010 A JP 2010-9794 A

  The present invention has been made in the background as described above, and the problem to be solved is that it is easy to manufacture with a simple structure, and ensures the stability of connection between aluminum wires and the strength of the splice. It is to provide a novel connection structure for an aluminum electric wire and a suitable manufacturing method thereof.

  Hereinafter, embodiments of the present invention made to solve the above-described problems will be described. In addition, the component employ | adopted in each aspect as described below is employable by arbitrary combinations as much as possible.

  A first aspect of the present invention relating to an aluminum electric wire connection structure is an aluminum electric wire connection structure in which an aluminum electric wire made of an aluminum-based material is connected to each other with a core wire covered with an insulating coating. While the opening at one end is crushed and sealed in a flat shape in the direction perpendicular to the axis, the core wire of the aluminum electric wire is connected to the cap terminal in which the opening at the other end is opened. The other end portion of the cap terminal is inserted from the opening side to the one end portion, and the one end side of the cap terminal is higher in compression rate than the other end side. By compressing in the direction perpendicular to the axis and being crimped to the aluminum electric wire, a high compression portion in which the core wire of the aluminum electric wire is crimped to each other with a high crimping force is provided on the one end side. On the other hand, the other end The aluminum electric wire at a lower contact pressure than the high compression portion is characterized in that the low compression portion is provided which is crimped to one another.

  According to this aspect, one end of the cap terminal is crushed and sealed in a flat shape in the direction perpendicular to the axis, and the core wire of the aluminum electric wire is inserted into the cap terminal. The vicinity of the part is compressed in the axial direction at a high compression rate in the axial direction. Thereby, the oxide film of the core wire of the aluminum electric wire is broken and the core wires are welded to each other, so that the aluminum wires can be stably connected to each other. At this time, even if the core wire of the aluminum electric wire is melted, since one end of the cap terminal is sealed, the possibility that the melted aluminum flows out of the cap terminal can be advantageously avoided.

  Further, the other end side of the cap terminal is compressed at a lower compression rate than the one end side, and the core wire of the aluminum electric wire is pressed against each other while being sandwiched between the wall surfaces of the cap terminal. Thereby, it can avoid that aluminum electric wire itself disconnects, and can ensure the intensity | strength of aluminum electric wire itself advantageously.

  In addition, since the core wire of the aluminum wire is accommodated in the cap terminal, the core wire of the aluminum wire sticks to the electrode for resistance welding when compressed at a high compression ratio as in the conventional structure. There is no risk of occurrence. In addition, since no flux or solder is used, the work process can be simplified and the burden on the environment can be advantageously reduced.

  A second aspect of the present invention relating to an aluminum electric wire connection structure is the synthetic structure for sealing at least a gap between the opening of the cap terminal and the aluminum electric wire in the aluminum electric wire connection structure according to the first aspect. A resin sealing member is provided.

  According to this aspect, the gap between the opening end portion of the cap terminal and the aluminum electric wire is sealed by the resin sealing member. Thereby, even if the cap terminal is made of a copper-based material, and there is a joint portion between the cap terminal and the core wire of the aluminum electric wire that is a connection between different metals in that case, the resin sealing member The inside of the cap terminal is completely sealed from the outside. Therefore, water exposure due to condensation is reliably prevented, and the possibility of corrosion between different metals is reduced as much as possible.

  According to a third aspect of the present invention relating to an aluminum electric wire connection structure, in the aluminum electric wire connection structure according to the first or second aspect, the cap terminal has an outer diameter dimension in the axial direction before compression. The compression ratio in the axial direction of the high compression portion of the cap terminal is set within a range of 10-25%, while the compression ratio in the axial direction of the low compression portion of the cap terminal is It is set within the range of 45-70%.

  According to this aspect, since the compression ratio in the axial direction of the high compression portion of the cap terminal is set in the range of 10-25%, the oxide film of the core wire of the aluminum electric wire is broken and the core wires are welded together. Thus, it is possible to more reliably realize the stable connection between the aluminum wires. Moreover, since the compression ratio in the axial direction of the low compression portion of the cap terminal is set in the range of 45 to 70%, the aluminum wire itself is prevented from being disconnected, and the strength of the aluminum wire itself is further advantageous. Can be secured.

  A first aspect of the present invention relating to a method for manufacturing a splice portion of an aluminum electric wire is a method for manufacturing a splice portion in which aluminum wires whose core wires covered with an insulating coating are made of an aluminum-based material are connected to each other. Cap terminal manufacturing step of obtaining a cap terminal by holding the opening of the other end in an open state while sealing the opening of one end of the cylindrical body into a flat shape by pressing, and the cap An insertion step of inserting the core wire of the aluminum electric wire from the opening of the other end of the terminal, and the one end side of the cap terminal is compressed in the axial direction with a high compression ratio to form the aluminum A high compression part manufacturing step of providing a high compression part in which the core wire of the aluminum electric wire is mutually crimped with a high crimping force on the one end side by crimping to the electric wire, and the cap terminal By compressing the one end side in the direction perpendicular to the axis at a compression rate lower than that of the one end side and crimping it to the aluminum electric wire, the other end side is crimped lower than the high compression part. And a low compression portion manufacturing step of providing a low compression portion in which the aluminum electric wires are pressure-bonded to each other by force.

  According to this aspect, the manufacturing method itself of the splice part of the aluminum electric wire can be performed very easily. That is, the core wire of the aluminum electric wire is inserted into the cap terminal formed by cutting and press-molding a metal cylinder such as copper or copper alloy, and the core wire of the aluminum electric wire is compressed at different compression ratios in at least two places of the cap terminal. Just by breaking the oxide film on the core wire of the aluminum electric wire and crimping the core wires to each other with a high crimping force, the high compression part and the core wire are crimped to each other with a relatively gentle pressure contact force. It is possible to simultaneously and quickly manufacture the low compression portion that ensures the strength. Therefore, it is possible to advantageously simplify the process of connecting the aluminum wires and shorten the working time.

  A second aspect of the present invention relating to a method for manufacturing a splice portion of an aluminum electric wire is the method for manufacturing a splice portion of an aluminum electric wire according to the first aspect, wherein the high compression portion manufacturing step and the low compression portion manufacturing step are performed. , Using a roller electrode.

  According to this aspect, the connecting step and the crimping step can be performed in one step by performing the connecting step and the crimping step using the roller electrode. Therefore, further simplification of the connection structure process and shortening of the working time can be advantageously achieved. In addition, by performing the connecting process and the crimping process using the roller electrode, the compression rate is continuously increased from one compression rate toward the other compression rate from one end of the cap terminal to the other end. It becomes possible to change to. Thereby, even if the required compression rate varies from individual to individual, the compression rate can be changed continuously, so that the required compression rate can be reliably covered.

  According to the present invention, one end of the cap terminal is crushed and sealed in a flat shape in the direction perpendicular to the axis, and the core wire of the aluminum electric wire is inserted into the cap terminal. The vicinity of the part is compressed at a high compression rate in the axial direction. Thereby, the oxide film of the core wire of the aluminum electric wire is broken and the core wires are welded to each other, so that the aluminum wires can be stably connected to each other. Moreover, it compresses with a compression rate lower than this in a location other than this, and the core wire of the aluminum electric wire is mutually crimped | bonded. Thereby, it can avoid that aluminum electric wire itself disconnects, and can ensure the intensity | strength of aluminum electric wire itself advantageously. Moreover, the manufacturing method itself of the splice part of an aluminum electric wire can be performed very easily, and it is possible to advantageously simplify the process of connecting the aluminum electric wires and shorten the working time.

The whole perspective view of the wire harness which branches the branch line which provided the splice part comprised by one Embodiment of this invention in the terminal from the trunk line. The perspective view which shows the connection structure of the aluminum electric wire as one Embodiment of this invention. Process drawing (a) (b) Cap terminal manufacturing process, (c) Insertion process and high compression part manufacturing process, (d) Low compression part which shows the manufacturing method of the splice part of the aluminum electric wire as one Embodiment of this invention Manufacturing process). IV-IV sectional drawing in FIG. Process drawing ((a) insertion process and high compression part manufacturing process, (b) showing the high compression part and the low compression part manufacturing process of a different aspect among the manufacturing methods of the splice part of the aluminum electric wire as one Embodiment of this invention, (b) ) Low compression part manufacturing process).

  Embodiments of the present invention will be described below with reference to the drawings.

  1 to 4 show a connection structure for an aluminum electric wire 10 as an embodiment of the present invention and a method for manufacturing the splice portion 12 having the connection structure, and in particular, a wire harness 14 (see FIG. 1). The case where the splicing part 12 is comprised by connecting the some aluminum electric wire 10 which comprises a) is shown.

  First, FIG. 1 shows a splice portion 12 having a connection structure for an aluminum electric wire 10 according to the present embodiment. As shown in FIG. 1, the trunk line 16 of the wire harness 14 is constituted by a bundle of many electric wires, and a predetermined electric wire group is branched to constitute a branch line 18. A splice portion 12 having the connection structure for the aluminum electric wire 10 of the present embodiment is formed at the end of the branch line 18. Although not shown, the splice 12 in FIG. 1 is fixed to the main line 16 with a binding tape or the like.

  FIG. 2 shows the spliced portion 12 extracted from the end of the branch line 18 in FIG. The splice unit 12 includes a cap terminal 20 and an aluminum electric wire 10. As shown in FIG. 3, the cap terminal 20 has an opening at one end 24 of the metal cylinder 22 crushed in a flat shape in the direction perpendicular to the axis and sealed, while the other end 26 has The opening 28 is configured to be opened. On the other hand, as shown in FIG. 2 and FIG. 3, the aluminum wire 10 has an insulation coating in which a core wire 30 in which a plurality of metal wires made of an aluminum-based material are bundled has an electrical insulating property such as an ethylene-based resin or a styrene-based resin. The structure is covered with 32. The core wire 30 of the aluminum electric wire 10 is inserted from the opening 28 side of the other end portion 26 of the cap terminal 20 to the one end portion 24, and the core wires 30 of the aluminum electric wire 10 are mutually connected within the cap terminal 20. To be connected to. The cap terminal 20 may be a metal material having a melting point higher than that of the core wire 30 of the aluminum electric wire 10, but is preferably made of a copper-based material such as copper or a copper alloy.

  Next, a method for connecting the aluminum electric wire 10 will be described with reference to FIGS. 3 and 4. First, as shown in FIGS. 3 (a) and 4 (a), a desired metal cylinder is obtained by cutting a metal cylinder made of, for example, copper or copper alloy into a predetermined length. 22 is prepared. Next, as shown in FIGS. 3B and 4B, in the cap terminal manufacturing process, the opening of one end 24 of the metal cylinder 22 is crushed into a flat shape by pressing. Seal. Thereby, the cap terminal 20 is obtained in which one end 24 of the metal cylinder 22 is crushed into a flat shape and sealed, while the opening 28 of the other end 26 is held in an open state. Can do.

  Next, the insulation coating 32 on the front end side of the aluminum electric wire 10 is peeled off to expose the core wire 30. 3 (c) and 4 (c), the tip of the aluminum electric wire 10 with the core wire 30 exposed is moved from the opening 28 of the other end 26 of the cap terminal 20 to one side. Insert up to end 24 of. This is the insertion process.

  Then, as shown in FIG. 4C, the welding electrode 33 is positioned on one end 24 side of the cap terminal 20 and compressed at a high compression rate in the direction perpendicular to the axis to be crimped to the aluminum electric wire 10. As a result, as shown in FIGS. 3D and 4D, the high compression portion 34 in which the core wire 30 of the aluminum electric wire 10 is crimped to each other with a high crimping force on one end portion 24 side. Provided. This is a high compression part manufacturing process. In addition, in order to understand easily, illustration of the welding electrode 33 is abbreviate | omitted in FIG. By this high compression part manufacturing process, in the high compression part 34, the oxide film of the core wire 30 of the aluminum electric wire 10 is broken and the core wires 30 are welded together, so that the aluminum electric wires 10 can be stably connected to each other. . At this time, even if the core wire 30 of the aluminum electric wire 10 is melted, the one end 24 of the cap terminal 20 is sealed, so that the possibility that the melted aluminum flows out of the cap terminal 20 can be advantageously avoided. . In addition, since the core wire 30 of the aluminum electric wire 10 is accommodated in the cap terminal 20, the core wire 30 of the aluminum electric wire 10 sticks to the electrode for resistance welding when compressed at a high compression rate as in the conventional structure. There is no risk of such problems. In addition, since no flux or solder is used, the work process can be simplified and the burden on the environment can be advantageously reduced. The compression ratio (= R1 / R) of the high compression portion 34 of the cap terminal 20 with respect to the outer diameter dimension of the cap terminal 20 before compression of the cap terminal 20 is within a range of 10-25%. It is desirable to be set to.

  Subsequently, as shown in FIG. 4D, the welding electrode 33 is positioned on the other end portion 26 side of the cap terminal 20, and in the axial direction at a compression rate lower than that of the one end portion 24 side. By compressing and crimping to the aluminum electric wire 10, a low compression portion 36 in which the aluminum electric wires 10 are crimped to each other with a lower crimping force than the high compression portion 34 is provided on the other end portion 26 side. This is a low compression part manufacturing process. By this low compression part manufacturing process, the aluminum wire 10 can be crimped to each other with a relatively gentle pressure contact force while the aluminum wire 10 is sandwiched between the wall surfaces of the cap terminal 20, thereby avoiding disconnection of the aluminum wire 10 itself. And the intensity | strength of aluminum electric wire 10 itself can be ensured advantageously. Note that the compression ratio (= R2 / R) in the axial direction of the low compression portion 36 of the cap terminal 20 with respect to the outer diameter dimension R in the axial direction before compression of the cap terminal 20 is within a range of 45 to 70%. It is desirable to be set to.

  Finally, as shown in FIG. 1, the splice portion 12 having the connection structure of the aluminum electric wire 10 seals the entire cap terminal 20 and the gap 38 between the opening 28 of the cap terminal 20 and the aluminum electric wire 10. A heat-shrinkable tube 40 is provided as a sealing member made of synthetic resin to be stopped. The heat-shrinkable tube 40 is inserted from one end 24 side of the cap terminal 20 and is disposed so as to sufficiently cover the entire cap terminal 20 and the gap 38 between the opening 28 of the cap terminal 20 and the aluminum electric wire 10. The In this state, the heat-shrinkable tube 40 is heated using heating means such as an electric heater. As a result, the heat shrinkable tube 40 is heat-shrinked, and hot melt (not shown) melted with the heat-shrinkable tube 40 is caused by the shrinkage force of the heat-shrinkable tube 40, so that the entire cap terminal 20, the opening 28 of the cap terminal 20, and the aluminum wire 10. It adheres closely to the tip of the insulating coating 32. Moreover, since the hot melt melted by heating is fluidized with a reduced viscosity, it can be filled evenly without leaving large gaps between the above-mentioned members. It can be adhered.

  As described above, the gap 38 between the opening 28 of the cap terminal 20 and the aluminum electric wire 10 is sealed by the heat shrinkable tube 40. Thereby, even if the cap terminal 20 is made of a copper-based material and there is a joint portion between the cap terminal 20 and the core wire 30 of the aluminum electric wire 10 in this case, the heat-shrinkable tube. 40, the inside of the cap terminal 20 is sealed from the outside in a liquid-tight state. Therefore, water exposure due to condensation is reliably prevented, and the possibility of corrosion between different metals is reduced as much as possible. In addition, as a synthetic resin sealing member, in addition to the heat-shrinkable tube 40, for example, a synthetic resin material such as epoxy resin (EP) may be used for sealing by insert molding or the like. Further, in this embodiment, the cap terminal 20 itself is sealed in addition to the gap 38 between the opening 28 of the cap terminal 20 and the aluminum electric wire 10, but the opening 28 of the cap terminal 20 and the aluminum electric wire 10 are sealed. Only the gap 38 may be sealed, and the cap terminal 20 itself may be covered with a binding tape or the like when the splice portion 12 is fixed to the trunk line 16 with a binding tape or the like.

  According to the method for manufacturing the splice portion 12 of the aluminum electric wire 10 of the present embodiment as described above, the method for manufacturing the splice portion 12 of the aluminum electric wire 10 can be performed very easily. That is, the cap terminal 20 can be formed simply by cutting a metal cylinder made of copper, copper alloy or the like and performing simple press molding, and the core wire 30 of the aluminum electric wire 10 is inserted into the cap terminal 20, The splice part 12 of the aluminum electric wire 10 of the present embodiment can be formed only by compressing the core wire 30 of the aluminum electric wire 10 at different compression rates at two locations of the cap terminal 20. That is, in the high compression part 34 formed in the high compression part manufacturing process, the oxide film on the core wire 30 of the aluminum electric wire 10 can be broken, and the core wires 30 can be brought into pressure contact with each other with a high pressure bonding force to be conducted. Moreover, in the low compression part 36 formed in the low compression part manufacturing process, the core wires 30 can be pressure-bonded to each other with a relatively gentle pressure contact force, thereby ensuring the member strength. Therefore, the process of the connection structure between the aluminum electric wires 10 can be simplified and the working time can be shortened advantageously.

  As mentioned above, although one Embodiment of this invention has been described, this is an illustration to the last, Comprising: This invention is not limited at all by the specific description in this Embodiment.

  For example, the high compression part manufacturing process and the low compression part manufacturing process of the present embodiment are not limited to ordinary resistance welding, and as shown in FIG. The compression part manufacturing process can also be performed using the roller electrode 42. That is, as shown in FIG. 5A, first, one end 24 side of the cap terminal 20 is sandwiched between a pair of roller electrodes 42 and 42 in the direction perpendicular to the axis. Subsequently, while the cap terminal 20 is compressed at a high compression rate in the direction perpendicular to the axis by the pair of roller electrodes 42, 42, a region where the pair of roller electrodes 42, 42 are rotated to compress the cap terminal 20 is set at one end. It is moved from the part 24 side toward the other end part 26 side. As shown in FIG. 5B, on the other end portion 26 side of the cap terminal 20, the cap terminal 20 is compressed by a pair of roller electrodes 42, 42 at a lower compression rate than the one end portion 24 side. Is supposed to be compressed. That is, the compression rate can be continuously changed from a high compression rate to a lower compression rate from the one end portion 24 side toward the other end portion 26 side. A welding power source (not shown) is connected to the pair of roller electrodes 42 and 42 so that the cap terminal 20 is pressurized and energized.

  Thus, by performing the high compression part manufacturing process and the low compression part manufacturing process using the roller electrode 42, the high compression part manufacturing process and the low compression part manufacturing process can be made into one process. Therefore, further simplification of the manufacturing process and shortening of the working time can be advantageously achieved. In addition, by performing the high compression part manufacturing process and the low compression part manufacturing process using the roller electrode 42, the compression rate is highly compressed from one end 24 to the other end 26 of the cap terminal 20. It is possible to continuously change from a rate to a lower compression rate. As a result, even if the required compression rate varies from individual to individual, the compression rate can be changed continuously, so that the required compression rate can be reliably covered.

  In addition, although not enumerated one by one, the present invention can be carried out in a mode to which various changes, modifications, improvements and the like are added based on the knowledge of those skilled in the art. It goes without saying that all are included in the scope of the present invention without departing from the spirit of the present invention.

10: Aluminum electric wire, 12: Splice part, 20: Cap terminal, 22: Metal cylinder, 24: One end part, 26: The other end part, 28: Opening part, 30: Core wire, 32: Insulation coating, 34 : High compression part, 36: low compression part, 38: gap, 40: heat shrinkable tube (sealing member made of synthetic resin), 42: roller electrode

Claims (5)

An aluminum wire connection structure in which core wires covered with an insulating coating mutually connect aluminum wires made of an aluminum-based material,
While the opening of one end of the metal cylinder is crushed and sealed in a flat shape in the direction perpendicular to the axis, the cap terminal in which the opening of the other end is opened,
The core wire of the aluminum electric wire is inserted from the opening side of the other end of the cap terminal to the one end,
The one end side of the cap terminal is compressed in the axial direction at a higher compression rate than the other end side and is crimped to the aluminum electric wire, so that the aluminum electric wire is placed on the one end side. The core wire is provided with a high compression portion that is crimped to each other with a high crimping force, while the aluminum electric wires are crimped to each other with a lower crimping force than the high compression portion on the other end side. A connection structure for aluminum electric wires, characterized in that a low compression part is provided.   The connection structure of the aluminum electric wire of Claim 1 provided with the sealing member made from the synthetic resin which seals the clearance gap between the said opening part of the said cap terminal and the said aluminum electric wire at least.   While the cap terminal is set to have a compression ratio in the axial direction of the high compression portion of the cap terminal in the axial direction with respect to the outer diameter dimension in the axial direction before compression, The aluminum electric wire connection structure according to claim 1 or 2, wherein a compression ratio in the axial direction of the low compression portion of the cap terminal is set in a range of 45 to 70%. A method of manufacturing a splice part in which aluminum wires made of an aluminum-based material are connected to each other with a core wire covered with an insulation coating,
Cap terminal manufacturing process of obtaining a cap terminal by holding the opening of the other end in an open state while sealing the opening of one end of the metal cylinder into a flat shape by pressing, and sealing
An insertion step of inserting the core wire of the aluminum electric wire from the opening of the other end of the cap terminal;
By compressing the one end side of the cap terminal in the direction perpendicular to the axis at a high compression rate and crimping to the aluminum electric wire, the core wire of the aluminum electric wire has a high crimping force on the one end side. A high-compression part manufacturing process for providing a high-compression part bonded to each other;
By compressing the other end side of the cap terminal in the direction perpendicular to the axis at a compression rate lower than that of the one end side and crimping to the aluminum electric wire, the high compression is applied to the other end side. A low-compression part manufacturing process for providing a low-compression part in which the aluminum electric wires are crimped to each other with a lower crimping force than the part;
The manufacturing method of the splice part of the aluminum electric wire characterized by including these.   The manufacturing method of the splice part of the aluminum electric wire of Claim 4 which performs the said high compression part manufacturing process and the said low compression part manufacturing process using a roller electrode.

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