JP6494445B2 - Terminalized wire manufacturing method - Google Patents

Description

  The present invention relates to a terminalized electric wire manufacturing method.

  2. Description of the Related Art Conventionally, a terminalized electric wire in which a terminal of a core element wire (conductor) of an electric wire is used as a terminal without using a terminal fitting is known (for example, Patent Document 1 below). This technology sets the conductor of the electric wire in the electric wire receiving groove of the female press electrode, pressurizes the conductor with the wire pressing protrusion of the male press electrode, and simultaneously energizes both electrodes to heat the conductor and solidifies it. A terminalized electric wire is obtained. More specifically, the electric wire receiving groove is formed in a substantially keyhole shape including an annular groove and a notch groove. Further, a guide pin for bending the electric wire is integrally provided upright at the center of the electric wire receiving groove. The wire pressing protrusion includes an annular portion and a key-shaped portion with respect to the wire receiving groove. Further, an insertion hole for the guide pin is provided at the center of the annular portion. Further, the wire pressing protrusion is fitted into the wire receiving groove via a gap. A conductor of the electric wire is set in such an electric wire receiving groove, and is pressurized and heated by a female press electrode and a male press electrode. The conductor is softened by heating to be easily molded, and is hardened by pressurization. In this way, the end of the conductor of the electric wire is solidified to be a terminal.

Japanese Patent Laid-Open No. 04-249875

  However, the terminalized electric wire may cause burrs on the outer periphery and inner periphery of the annular terminal portion. In this case, in order to make the terminal of the conductor of the electric wire into a terminal, a step of removing burrs is necessary, and labor and time are required. Thus, in the terminalized electric wire manufacturing method, there is room for improvement in terms of suppressing the generation of burrs.

  Therefore, an object of the present invention is to provide a method of manufacturing a terminalized electric wire that can suppress the generation of burrs.

  In order to achieve the above object, the present invention provides a first step of forming an annular portion by forming an annular portion of a conductor exposed by peeling off a coating of an electric wire, and covering the outer periphery of the annular portion after the first step. In a state where the frame member is disposed and the core-shaped member is disposed on the inner circumference of the annular portion, the annular portion, the formwork member, and the core shape are paired with a pair of electrodes whose end faces face in the axial direction of the annular portion. The annular portion is pressed and heated in the axial direction of the annular portion in a state where the member is sandwiched, so that the annular portion melts and solidifies, and a terminal portion having a thin portion on the inner periphery of the annular portion And a third step of forming the fastening hole by removing the thin portion after the second step, and the core member has an axial direction in the axial direction of the annular portion. Are formed in a cylindrical shape having a thickness smaller than the axial thickness of the annular portion, In the annular portion which is molten, partially solidified flows into the core member side forms the thin portion is characterized by.

  The core members are arranged in a pair on the end surfaces of the pair of electrodes. In the second step, the pair of core members add the annular portion in the axial direction of the annular portion. When pressing and heating, it is preferable that the annular portion is opposed to the annular central portion with a space therebetween, and the thin portion is formed at the central portion in the axial direction of the annular portion.

  In the third step, it is desirable that the thin portion is punched by being pressed in the axial direction of the annular portion.

  The terminalized wire manufacturing method according to the present invention has an effect that the generation of burrs can be suppressed.

FIG. 1 is a perspective view showing a terminalized electric wire manufactured by a terminalized electric wire manufacturing method according to an embodiment of the present invention. FIG. 2 is a perspective view for explaining a first step of the terminalized wire manufacturing method according to the embodiment of the present invention. FIG. 3 is a perspective view for explaining a first step of the terminalized wire manufacturing method according to the embodiment of the present invention. FIG. 4 is a flowchart for explaining the terminalized wire manufacturing method according to the embodiment of the present invention. FIG. 5 is an exploded perspective view for explaining a second step of the terminalized wire manufacturing method according to the embodiment of the present invention. FIG. 6 is a perspective view for explaining a second step of the terminalized wire manufacturing method according to the embodiment of the present invention. FIG. 7: is sectional drawing explaining the 2nd process of the terminal-ized electric wire manufacturing method which concerns on embodiment of this invention. FIG. 8: is a perspective view explaining the 2nd process of the terminal-ized electric wire manufacturing method which concerns on embodiment of this invention. FIG. 9 is a perspective view illustrating a third step of the method of manufacturing a terminalized wire according to the embodiment of the present invention. FIG. 10: is a perspective view explaining the 3rd process of the terminal-ized electric wire manufacturing method which concerns on embodiment of this invention. FIG. 11: is sectional drawing explaining the 2nd process of the terminal-ized electric wire manufacturing method which concerns on the modification of this invention. FIG. 12: is sectional drawing explaining the 2nd process of the terminal-ized electric wire manufacturing method which concerns on the modification of this invention.

  Below, embodiment of the terminal-ized electric wire manufacturing method which concerns on this invention is described in detail based on drawing. In addition, this invention is not limited by this embodiment. In addition, constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same.

[Embodiment]
FIG. 1 is a perspective view showing a terminalized electric wire manufactured by a terminalized electric wire manufacturing method according to an embodiment of the present invention. FIG. 2 is a perspective view for explaining a first step of the terminalized wire manufacturing method according to the embodiment of the present invention. FIG. 3 is a perspective view for explaining a first step of the terminalized wire manufacturing method according to the embodiment of the present invention. FIG. 4 is a flowchart for explaining the terminalized wire manufacturing method according to the embodiment of the present invention. FIG. 5 is an exploded perspective view for explaining the second step of the terminalized wire manufacturing method according to the embodiment of the present invention. FIG. 6 illustrates the second step of the terminalized wire manufacturing method according to the embodiment of the present invention. FIG. FIG. 7: is sectional drawing explaining the 2nd process of the terminal-ized electric wire manufacturing method which concerns on embodiment of this invention. FIG. 8: is a perspective view explaining the 2nd process of the terminal-ized electric wire manufacturing method which concerns on embodiment of this invention. FIG. 9 is a perspective view illustrating a third step of the method of manufacturing a terminalized wire according to the embodiment of the present invention. FIG. 10: is a perspective view explaining the 3rd process of the terminal-ized electric wire manufacturing method which concerns on embodiment of this invention.

  The terminalized wire manufacturing method according to the present embodiment manufactures the terminalized wire 1 shown in FIG. The terminalized electric wire 1 is applied to, for example, a wire harness routed in a vehicle. The terminalized electric wire 1 transmits electric power, a control signal, etc. between various electronic devices mounted in a vehicle etc., for example.

  In the present embodiment, the axial direction in the following description is the axial direction of the annular portion 23 of the electric wire 2 described later, that is, the fastening hole 33 of the terminal portion 3. Moreover, the electric wire extending direction is a direction in which the conductor 21 of the electric wire 2 extends linearly. In the electric wire extending direction, the side where the annular portion 23 of the electric wire 2 is located is referred to as the front, and the side where the conductor 21 covered with the covering portion (covering) 22 of the electric wire 2 is referred to as the rear.

  Specifically, the terminalized electric wire 1 includes an electric wire 2 and a terminal portion 3. More specifically, the terminalized electric wire 1 is obtained by forming the terminal portion 3 shown in FIG. 1 by converting the terminal of the electric wire 2 shown in FIG. 2 and FIG. 3 into terminals by the terminalized electric wire manufacturing method according to this embodiment. .

  As illustrated in FIG. 2, the electric wire 2 includes a linear conductor 21 and a covering portion 22 that covers the outer peripheral side of the conductor 21. The conductor 21 is a conductive core wire and is formed of a metal member through which electricity passes. The conductor 21 is formed to extend with substantially the same diameter in the linearly extending direction. The conductor 21 is made of, for example, copper, copper alloy, aluminum, aluminum alloy, or the like. The conductor 21 has a conductor structure formed by twisting the strands 21a, or a rod-shaped conductor structure having a rectangular or round cross section (for example, a conductor structure having a flat single core or a round single core. In this case, the wire itself May also be rod-shaped). In the case of a stranded wire, the conductor 21 may be twisted around a core material (a rigid wire). In the present embodiment, the conductor 21 is a simple bundle of a plurality of strands 21a. The covering portion 22 is a wire covering that covers the outer peripheral side of the conductor 21. The covering portion 22 is provided in contact with the outer peripheral surface of the conductor 21. The covering portion 22 is formed by, for example, extruding an insulating resin material (PP, PVC, cross-linked PE, etc., which is appropriately selected in consideration of wear resistance, chemical resistance, heat resistance, etc.). Is done. The covering portion 22 is formed from one end to the other end in the extending direction of the conductor 21. In the electric wire 2, the covering portion 22 is peeled off at the terminal 21 b of the conductor 21, and the terminal 21 b of the conductor 21 is exposed from the covering portion 22. As an example, the cross-sectional shape of the conductor 21 (the cross-sectional shape in the direction intersecting the electric wire extension direction) of the electric wire 2 is substantially circular, and the cross-sectional shape of the covering portion 22 (the cross-sectional shape in the direction crossing the electric wire extension direction). It has a substantially annular shape, and has a substantially circular cross-sectional shape as a whole.

  The terminal portion 3 is obtained by terminalizing the terminal 21 b of the conductor 21 of the electric wire 2. More specifically, after the terminal portion 3 shown in FIG. 1 melts the terminal portion 21b of the conductor 21 of the electric wire 2 shown in FIG. 2 by pressurizing and heating the annular portion 23 formed into an annular shape as shown in FIG. It is solidified. For this reason, the terminal part 3 has a linear trace (not shown) in which the conductor 21 is melted on the surface thereof. The terminal portion 3 is a portion that is electrically connected to an electrode or the like provided in an electric device such as a counterpart terminal or a battery. The terminal part 3 includes a connection part 31 and a fastening hole 33. The connection part 31 is formed in a flat circular shape. Further, the connection portion 31 is formed with a circular fastening hole 33 at the center thereof. The fastening hole 33 is inserted and fastened to an electrode or the like provided in an electrical device such as a counterpart terminal or a battery. In order to ensure electrical connection with the electrodes and the like provided in the other terminal or battery or other electrical equipment, it is necessary to manage the torque at the time of fastening using the fastening hole 33.

  Here, with reference to FIG. 5, the 1st press electrode 4, the 2nd press electrode 5, the mold member 6, and the core-shaped member 7 which are used for the terminal-ized electric wire manufacturing method are demonstrated.

  The first press electrode 4 is made of a material having electrical conductivity and high thermal conductivity and having a melting point higher than that of the conductor 21 of the electric wire 2. As shown in FIGS. 5 to 9, the first press electrode 4 has an annular shape with the annular portion 23, the mold member 6, and the core member 7 sandwiched between the second press electrode 5 described later. The part 23 is pressurized and heated. As for the 1st press electrode 4, the main-body part 40 and the electric wire press part 41 are integrally formed.

  The main body 40 is formed in a columnar shape. The main body 40 is arranged with the axial direction coincident with the axial direction. The front end surface 40a of the main body 40 is disposed to face the front end surface 50a of the main body 50 of the second press electrode 5 described later. The main body 40 is disposed such that the front end surface 40a is positioned below in the axial direction. An electric wire pressing portion 41 is formed on the distal end surface 40a.

  The electric wire pressing part 41 pressurizes and heats the annular part 23 in a state where the annular part 23 is sandwiched between the electric wire pressing part 51 of the second press electrode 5 described later. The electric wire pressing portion 41 is formed in a columnar shape whose axial direction coincides with the axial direction of the main body portion 40. The electric wire pressing part 41 is formed in the same shape as the terminal part 3 to be molded as viewed in the axial direction. More specifically, the electric wire pressing part 41 is located in front of the electric wire extending direction and curved in a convex shape in front of the electric wire extending direction in the axial direction, and rearward in the electric wire extending direction. And a trapezoidal trapezoidal part having a circular chord at the bottom and an upper side located behind the wire extending direction. The wire pressing portion 41 has a flat tip surface 41a and an inclined surface inclined with respect to the axial direction so that the height in the axial direction becomes lower toward the rear in the wire extending direction in the trapezoidal portion when viewed in the axial direction. 41b. The front end surface 41a and the inclined surface 41b of the electric wire pressing part 41 are arranged to face the front end surface 51a and the inclined surface 51b of the electric wire pressing part 51 of the second press electrode 5 described later.

  The second press electrode 5 is formed symmetrically with the first press electrode 4 with the front end surface 51 a of the wire pressing portion 51 as a symmetry plane. The second press electrode 5 is disposed such that the tip surface 50a is positioned above in the axial direction. The second press electrode 5 is arranged such that the tip surface 50 a and the inclined surface 51 b are opposed to the tip surface 40 a and the inclined surface 41 b of the first press electrode 4.

  The first press electrode 4 and the second press electrode 5 configured as described above pressurize and heat the annular portion 23 in a state where the tip surfaces 41a and 51a and the inclined surfaces 41b and 51b sandwich the annular portion 23. The annular portion 23 pressurized and heated by the first press electrode 4 and the second press electrode 5 is melted and solidified to form a terminal.

  The mold member 6 is made of a material having high thermal conductivity and a melting point higher than that of the conductor 21 of the electric wire 2. As shown in FIGS. 5 to 7, the mold member 6 is a mold for pressing the outer periphery of the annular portion 23 and forming the outer periphery of the terminal portion 3. The mold member 6 is configured by combining a first divided piece 61 and a second divided piece 62.

  The first divided piece 61 is formed of a rectangular plate material. The first divided pieces 61 are arranged such that the end faces 61a and 61c coincide with the electric wire extending direction. Moreover, the 1st division | segmentation piece 61 is arrange | positioned orthogonally to an axial direction. The first segment 61 is notched so that the end surface 61 a is along the outer periphery of the wire pressing portion 41 of the first press electrode 4 and the wire pressing portion 51 of the second press electrode 5. More specifically, the notch 61A of the first divided piece 61 is located in the arc portion 61A1 located in front of the electric wire extending direction and the central portion in the electric wire extending direction in the axial direction view, and in the electric wire extending direction. Consists of an inclined portion 61A2 that is inclined with respect to the wire extending direction so that the width of the notch is narrowed toward the rear, and a linear portion 61A3 that is located behind the wire extending direction and is parallel to the wire extending direction. Has been. The first divided piece 61 has a plate thickness t1. The plate thickness t1 is larger than the thickness t3 of the annular portion 23 and the plate thickness of the connection portion 31 of the molded terminal portion 3.

  The second divided piece 62 is formed symmetrically with the first divided piece 61 with the end face 62a as a symmetry plane. The second divided piece 62 is arranged such that the end face 62 a faces the end face 61 a of the first divided piece 61. For this reason, as shown in FIG. 6, in the state which combined the 1st division | segmentation piece 61 and the 2nd division | segmentation piece 62 and pinched | interposed the cyclic | annular part 23 and the electric wire press parts 41 and 51, the formwork member 6 is the cyclic | annular part 23. Cover the outer periphery of.

  When the first divided piece 61 and the second divided piece 62 configured as described above are combined with the end face 61a and the end face 62a facing each other, a notch 6A having a shape matching the outer periphery of the terminal portion 3 is formed. The notch 6A is fitted to the wire pressing portions 41 and 51 in a state where the first divided piece 61 and the second divided piece 62 are combined to sandwich the annular portion 23 and the wire pressing portions 41 and 51.

  The core member 7 forms a fastening hole 33 on the inner periphery of the connecting portion 31. The core member 7 is made of a material having high thermal conductivity and having a melting point higher than that of the conductor 21 of the electric wire 2. The core member 7 is formed integrally with at least one of the first press electrode 4 and the second press electrode 5. As shown in FIGS. 5 and 7, the core member 7 has a cylindrical shape with an axial height t <b> 2 (<t <b> 1). The axial direction of the core member 7 coincides with the axial direction. In the present embodiment, a pair of core members 7 are formed at the center of the wire pressing portion 41 of the first press electrode 4 and the wire pressing portion 51 of the second press electrode 5. Further, as shown in FIG. 7, the sum of the heights t2 of the pair of core members 7 is smaller than t1. For this reason, when the annular portion 23 is sandwiched between the first press electrode 4 and the second press electrode 5, the tip surfaces 7a of the two core members 7 are separated by a distance t4 in the axial direction.

  Next, with reference to FIGS. 1 to 10, a method for manufacturing a terminalized electric wire will be described. In the terminalized electric wire manufacturing method, the first to third steps are performed along the flow shown in FIG.

  First, in the annular portion forming step (step S1) as the first step, as shown in FIG. 2, the covering portion 22 of the electric wire 2 is peeled off and the conductor 21 is exposed. As shown in FIG. 3, the exposed conductor 21 is formed into an annular shape to form an annular portion 23. In more detail, as for the electric wire 2, the coating | coated part 22 is stripped and the terminal 21b of the conductor 21 is exposed several cm. At this time, the terminal 21b of the conductor 21 is exposed longer than the circumference of the terminal portion 3 to be formed. The exposed end 21b of the conductor 21 is bent to form an annular portion 23. At this time, the end 21 b of the conductor 21 is overlapped with the end 21 b of the conductor 21.

  Then, in the melting step (step S <b> 2) as the second step after the first step, as shown in FIG. 5, the mold member 6 is disposed so as to cover the outer periphery of the annular portion 23. As shown in FIGS. 6 and 7, the first press electrode 4 and the second press electrode 5 are arranged so as to sandwich the annular portion 23, the mold member 6, and the core member 7 therebetween. More specifically, the first press electrode 4 and the second press electrode 5 are arranged such that the axial direction coincides with the axial direction. At this time, the 1st press electrode 4 is arrange | positioned so that the front end surface 40a may be located below in an axial direction. The second press electrode 5 is arranged so that the tip surface 50a is positioned above in the axial direction. Moreover, the front end surface 41a and the inclined surface 41b of the electric wire pressing part 41 and the front end surface 51a and the inclined surface 51b of the electric wire pressing part 51 are disposed to face each other. Furthermore, the 1st division | segmentation piece 61 and the 2nd division | segmentation piece 62 are arrange | positioned so that the annular part 23 may be pinched | interposed from the direction orthogonal to an electric wire extension direction and an axial direction. At this time, the first divided pieces 61 and the second divided pieces 62 are arranged such that the end surfaces 61a, 61c, 62a, and 62c coincide with the electric wire extending direction.

  At this time, the pair of core members 7 are located on the inner periphery of the annular portion 23. Further, the tip surfaces 7a of the two core members 7 are separated from each other by a distance t4 in the axial direction.

  Then, the first press electrode 4 and the second press electrode 4 and the second press electrode 5 are sandwiched between the first press electrode 4 and the second press electrode 5 in this manner. By pressing and heating the annular portion 23 in the axial direction by the press electrode 5, the annular portion 23 is solidified after being melted. More specifically, as shown in FIG. 6 to FIG. 10, the melted annular portion 23 is solidified in a flat shape by the tip surfaces 41 a and 51 a and the inclined surfaces 41 b and 51 b and the mold member 6 to have a connection portion 31. Molded as a terminal portion 3. At this time, since the notch 6 </ b> A is fitted to the wire pressing portions 41 and 51, the molten annular portion 23 is suppressed from leaking to the outer peripheral side of the wire pressing portions 41 and 51. Therefore, as shown in FIG. 7, the melted annular portion 23 flows out from the gap between the pair of core members 7 to the inner peripheral side (the central portion in the radial direction), as shown in FIGS. 9 and 10. The thin portion 32 is formed. The thin portion 32 is formed at the central portion of the connecting portion 31 in the axial direction. Moreover, the plate | board thickness of the thin part 32 is t4. The plate thickness t4 is thinner than the plate thickness of the connection portion 31.

  And in the thin part removal process (step S3) as a 3rd process after a 2nd process, as shown in FIG. 1, the fastening hole 33 is formed in the terminal part 3. FIG. More specifically, the thin portion 32 as shown in FIGS. 9 and 10 is removed from the terminal portion 3 to form a fastening hole 33 as shown in FIG. In the present embodiment, the fastening hole 33 is stamped by inserting a die or the like into the thin portion 32. As a result, the terminal portion 3 is formed with a fastening hole 33 penetrating in the thickness direction in the central portion in the radial direction.

  Thus, the terminalized electric wire 1 is formed by forming the terminal portion 3 by forming the electric wire 2 into a terminal by the terminalized electric wire manufacturing method.

  According to the terminalized electric wire manufacturing method described above, since the notch 6A is fitted to the electric wire pressing portions 41 and 51, the molten annular portion 23 leaks to the outer peripheral side of the electric wire pressing portions 41 and 51. It is suppressed. For this reason, the terminalized electric wire manufacturing method can suppress the generation | occurrence | production of the burr | flash on the outer peripheral side of the terminal part 3 at the time of shaping | molding. The melted annular portion 23 flows out from the gap between the pair of core members 7 to the inner peripheral side of the annular portion 23 to form a thin portion 32. And the terminal part 3 removes the thin part 32 and forms the fastening hole 33. For this reason, since the terminalized electric wire manufacturing method removes the thin-walled portion 32 that is thinner than the connection portion 31, it can be easily processed and suppresses the generation of burrs on the inner peripheral side of the terminal portion 3. be able to.

  According to this method for manufacturing a terminalized electric wire, the thin portion 32 is formed at the central portion in the axial direction of the connecting portion 31. For this reason, even if burrs are generated when the thin-walled portion 32 is stamped or the like, the generated burrs can be prevented from staying in the fastening holes 33 and protruding outward from the fastening holes 33. . Thus, the terminalized electric wire manufacturing method can suppress the generation of burrs when the fastening holes 33 are formed.

  According to this method of manufacturing a terminalized electric wire, the terminal portion 3 is formed by inserting a die or the like into the thin portion 32 and performing a punching process or the like to form the fastening hole 33. For this reason, since the thin-walled portion 32 having a thickness smaller than that of the connecting portion 31 is stamped, the terminalized electric wire manufacturing method can more reliably suppress the generation of burrs when the fastening holes 33 are formed.

[Modification 1]
In the said embodiment, although the thin part 32 was demonstrated as what is formed in the center part in the axial direction of the connection part 31, you may form in another position. Specifically, for example, as shown in FIG. 11, a case where the thin portion 32A is formed at the upper portion in the axial direction of the connecting portion 31A will be described. FIG. 11: is sectional drawing explaining the 2nd process of the terminal-ized electric wire manufacturing method which concerns on the modification of this invention.

  First, the core member 8 used for the terminalized electric wire manufacturing method will be described. The core member 8 is integrally formed at the center portion of the wire pressing portion 51 of the second press electrode 5. The core member 8 has a columnar shape with an axial height t5 (<t1). As for the core-shaped member 8, the axial direction corresponds to an axial direction. For this reason, when the annular portion (not shown) is sandwiched between the first press electrode 4 and the second press electrode 5, the distal end surface 8 a of the core member 8 is formed on the wire pressing portion 41 of the first press electrode 4. A distance t6 is spaced apart from the distal end surface 41a in the axial direction.

  According to the terminalized electric wire manufacturing method using the second press electrode 5 in which the core member 8 is disposed, the melted annular portion (not shown) is the tip of the core member 8 in the second step. The thin portion 32A is formed by flowing out from the gap between the surface 8a and the distal end surface 41a of the wire pressing portion 41 to the inner peripheral side (the central portion in the radial direction). The thin portion 32A is formed at the upper portion in the axial direction of the connecting portion 31A. The plate thickness of the thin portion 32A is t6. The plate thickness t6 is thinner than the plate thickness of the connection portion 31A.

  Then, in the third step, the thin portion 32A is subjected to a punching process or the like with a die or the like inserted from above in the axial direction of the connecting portion 31A. As a result, the terminal portion 3A is formed with a fastening hole 33A penetrating in the thickness direction in the central portion in the radial direction.

  According to this terminalized electric wire manufacturing method, the thin portion 32A is formed at the upper portion in the axial direction of the connecting portion 31A. Further, when the thin portion 32A is subjected to a punching process or the like, a die or the like is inserted from above in the axial direction of the connection part 31A, and the punching process or the like is performed downward. For this reason, even if burrs are generated when the thin-walled portion 32A is stamped or the like, the generated burrs can be prevented from staying in the fastening holes 33A and protruding outward from the fastening holes 33A. . Thus, the terminalized electric wire manufacturing method can suppress the generation of burrs when the fastening holes 33A are formed.

[Modification 2]
Specifically, for example, as shown in FIG. 12, a case where the thin portion 32B is formed in the lower portion in the axial direction of the connecting portion 31B will be described. FIG. 12: is sectional drawing explaining the 2nd process of the terminal-ized electric wire manufacturing method which concerns on the modification of this invention.

  First, the core member 9 used for the terminalized electric wire manufacturing method will be described. The core member 9 is integrally formed at the center of the wire pressing portion 41 of the first press electrode 4. The core member 9 has a cylindrical shape with an axial height t7 (<t1). As for the core-shaped member 9, the axial direction corresponds to an axial direction. For this reason, when an annular portion (not shown) is sandwiched between the first press electrode 4 and the second press electrode 5, the distal end surface 9 a of the core member 9 is formed on the wire pressing portion 51 of the second press electrode 5. The tip surface 51a is spaced apart by a distance t8 in the axial direction.

  According to the terminalized electric wire manufacturing method using the first press electrode 4 in which the core member 9 is arranged, the melted annular portion (not shown) is the tip of the core member 9 in the second step. The thin portion 32B is formed by flowing out from the gap between the surface 9a and the distal end surface 51a of the wire pressing portion 51 to the inner peripheral side (the central portion in the radial direction). The thin portion 32B is formed at the lower portion in the axial direction of the connecting portion 31B. Moreover, the plate | board thickness of the thin part 32B is t8. The plate thickness t8 is thinner than the plate thickness of the connection portion 31B.

  In the third step, the thin portion 32B is subjected to a punching process or the like by inserting a die or the like from below in the axial direction of the connecting portion 31B. As a result, the terminal portion 3B is formed with a fastening hole 33B penetrating in the plate thickness direction in the central portion in the radial direction.

  According to this terminalized electric wire manufacturing method, the thin portion 32B is formed at the lower portion in the axial direction of the connecting portion 31B. Further, when the thin portion 32B is subjected to a punching process or the like, a die or the like is inserted from below in the axial direction of the connection part 31B, and the punching process or the like is performed upward. For this reason, even if burrs are generated when the thin-walled portion 32B is stamped or the like, the generated burrs can be prevented from staying in the fastening holes 33B and protruding outward from the fastening holes 33B. . Thus, the terminalized electric wire manufacturing method can suppress the generation of burrs when forming the fastening holes 33B.

  In addition, the terminalized electric wire manufacturing method which concerns on embodiment of this invention mentioned above is not limited to embodiment mentioned above, A various change is possible in the range described in the claim.

  The mold member 6 described above has been described as being separate from the first press electrode 4 and the second press electrode 5, but is not limited thereto, and is integrated with the first press electrode 4 or the second press electrode 5. You may form as.

  The shape of the terminal portion 3 described above may be another shape such as a circular shape, a rectangular shape, or a polygonal shape.

1 Terminalized electric wire 2 Electric wire 21 Conductor 21b Terminal 22 Covering part (covering)
23 annular part 3 terminal part 31 connection part 32 thin part 33 fastening hole 4 first press electrode (one pair of electrodes)
41a Front end surface (end surface)
5 Second press electrode (a pair of electrodes)
51a Tip face (end face)
6 Formwork member 61 1st division piece (formwork member)
62 Second segment (formwork member)
7 Core member

Claims (3)

A first step of forming an annular portion by making the conductor exposed by peeling off the coating of the electric wire into an annular shape;
After the first step, a pair of frame members are arranged to cover the outer periphery of the annular portion, and a core member is disposed on the inner periphery of the annular portion. The annular part is melted and solidified by pressing and heating the annular part in the axial direction of the annular part in a state where the annular part, the formwork member, and the core member are sandwiched between the electrodes. And a second step of forming a terminal portion having a thin portion on the inner periphery of the annular portion,
A third step of forming the fastening hole by removing the thin portion after the second step;
Including
The core-shaped member is formed in a columnar shape having an axial direction coinciding with the axial direction of the annular portion and having a thickness smaller than the axial thickness of the annular portion,
In the second step, the molten annular part partially solidifies by flowing out to the core member side to form the thin part,
A terminalized electric wire manufacturing method characterized by that. The core members are arranged in a pair on the end faces of the pair of electrodes,
In the second step, the pair of core members oppose each other with a gap in the central portion in the axial direction of the annular portion when the annular portion is pressurized and heated in the axial direction of the annular portion. The thin wall portion is formed at a central portion in the axial direction of the annular portion.
The terminalized electric wire manufacturing method according to claim 1. In the third step, the thin portion is pressed and punched in the axial direction of the annular portion.
The terminalized electric wire manufacturing method according to claim 1 or 2.

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