JP2012022931A - Mold and pressure bonding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mold and a pressure bonding method capable of preventing a part of electric wires including a core wire (signal conductor), a shield line (shield conductor), and a sheath from between both ends of a terminal forming piece from being pinched by the terminal forming piece in caulking signal conductors of electric wires put on the terminal forming piece in such a way as to enclose them.SOLUTION: An upper mold 18 includes in-mold wall surfaces 18a to bend a terminal forming piece 12. The in-mold wall surfaces 18a expand in a tapered shape toward a lower mold 19 and an angle formed by two surfaces of the in-mold wall surfaces crossing at the deepest part is an obtuse angle.

Description

  The present invention relates to a mold for crimping a terminal to an electric wire having a signal conductor such as a coaxial cable, and a crimping method using the mold.

  As a conventional shielded wire terminal connection structure, a shield conductor is covered with an insulating jacket around the signal conductor connected to the inner conductor terminal, and the outer periphery is covered with an insulating jacket. Patent Document 1 discloses an outer conductor terminal connected to a terminal portion of an electric wire.

  This shielded wire terminal connection structure has a wire barrel composed of a pair of crimping pieces for sandwiching the shielded wire (conductor) exposed from the shielded wire terminal to an outer conductor terminal. The crimping process of the shielded wire with the crimped piece of the wire barrel is as follows.

  First, as shown in FIG. 6A, a crimper 40 is disposed above the wire barrel 26 and the shielded electric wire 10 placed thereon, and an anvil 42 is disposed below the wire barrel 26. At the time of the crimping process, the wire barrel crimper 40 descends from above the wire barrel 26 and the shielded electric wire 10 placed thereon, and first, on the mold inner wall surface 76 of the shallower recess of the crimper 40 in the figure. The left pressure contact piece 30b comes into contact and begins to bend inward along the inner wall surface 76 of the mold. Further, the crimper 40 continues to descend, the right crimping piece 30a comes into contact with the deeper mold inner wall surface 80 of the crimper 40, and the crimping piece 30a is also along the inner mold wall surface 80 with the left crimping piece 30b. Begin to bend inward.

  Further, the anvil 42 disposed under the wire barrel 26 sandwiches the wire barrel 26 and the shielded electric wire 10 placed thereon with the crimper 40. Then, as shown in FIG. 6B, the tips of the crimping pieces 30 a and 30 b reach the projecting portion 78 near the center axis of the crimper 40 and wrap the shielded electric wire 10.

  As shown in FIG. 6 (c), the tip of the left crimping piece 30 b that has begun to be bent first on the wire barrel 26 side is guided by a projecting portion 78 near the center of the crimper 40 and guided downward. Furthermore, the tip of the right crimping piece 30a that has begun to bend is bent so as to overlap the left crimping piece 30b. Furthermore, the crimper 40 continues to descend, and the bending progresses without the tips of the crimping pieces 30a and 30b reaching the projecting portion 78 near the center of each crimper 40 colliding.

  Here, on the wire barrel 26 side, the crimping piece 30b bent along the shallower mold inner wall surface 76 of the crimper 40 wraps around under the opposite crimping piece 30a, and FIG. 6 (c) and FIG. 6 (d), the tip of the crimping piece 30a on the right side in the drawing is sandwiched and pressed between the tip of the crimping piece 30b bent from the left side and the protruding portion 78 of the crimper 40. At this time, the tip of the crimping piece 30a is pushed in the direction indicated by the arrow 62 in FIG.

  The crimper 40 continues to descend further, and as shown in FIG. 6D, on the wire barrel 26 side, the tip of the left crimping piece 30b is below the right crimping piece 30a, and the tip of the right crimping piece 30a is The upper side of the left crimping piece 30b is overlapped and overlapped evenly from both the left and right sides. Finally, as shown in FIG. Thus, it is possible to obtain a terminal connection structure of a shielded wire in a good crimped state without any deviation.

JP 2006-147223 A

The above-described conventional shield wire terminal connection structure has the following problems to be solved.
That is, the shielded electric wire 10 is not in the normal caulking position of the wire barrel 26 due to vibration generated when the crimper 40 is lowered as shown in FIG. A gap H as shown in a) may occur. In this case, when the tips of the crimping pieces 30a and 30b of the wire barrel 26 begin to interfere (contact) with the inner wall surfaces 76 and 80 of the mold as shown in FIG. ) Cannot be brought into contact with the shielded electric wire 10. For this reason, the wire barrel 26 is bent so as to be freely bent around the central portion which is the bottom thereof, and the curvature of the bent portion becomes extremely small. Accordingly, if the crimper 40 continues to descend in this state as described above, when the crimping pieces 30a and 30b wrap the shielded electric wire 10 while keeping the gap H, a part (upper part) of the shielded electric wire 10 is illustrated. As shown in FIG. 7 (b), it is sandwiched between the crimping pieces 30a and 30b. As a result, there is an inconvenience that the shielded electric wire 10 is not completely held by the wire barrel 26 and the shielded electric wire 10 comes out of the wire barrel 26. A similar problem occurs between a signal conductor composed of a plurality of core wires and a terminal held by crimping on the signal conductor.

  The present invention has been made in view of the above-described circumstances, and its purpose is to provide a signal conductor from between both ends of the terminal forming piece when crimping so as to wrap the signal conductor of the electric wire placed on the terminal forming piece. It is an object of the present invention to provide a mold and a pressure bonding method that can prevent protrusion of the metal.

  The present invention has been made in view of the above-described circumstances. The purpose of the present invention is to squeeze a signal conductor of an electric wire placed on the terminal forming piece so as to wrap the signal conductor between both ends of the terminal forming piece. It is an object of the present invention to provide a mold and a crimping method capable of preventing a part of an electric wire including a signal conductor), a shield wire (shield conductor), and an outer sheath from being sandwiched between terminal forming pieces.

In order to achieve the above-described object, a mold according to the present invention is characterized by the following (1).
(1) Crimping the terminal forming piece of a chain terminal including a carrier and flat terminal forming pieces provided continuously at a plurality of positions in the longitudinal direction of the carrier to a signal conductor exposed in a part of the electric wire A mold having an upper mold and a lower mold for
The upper mold has a mold inner wall surface for bending the terminal forming piece,
The inner wall surface of the mold expands in a tapered shape toward the lower mold, and an angle formed by two surfaces of the inner wall surface of the mold that intersects at the deepest portion is an obtuse angle.
A mold characterized by that.

  According to the mold having the configuration (1), at the beginning of crimping the terminal forming piece with the mold so as to wrap the signal conductor exposed from the electric wire, the taper surface of the mold has both ends of the terminal forming piece downward. While pressing, both end portions are pressed in a direction approaching each other. For this reason, in the process in which the terminal forming piece is deformed from the U shape to the cylindrical shape (O shape), a force in the direction of expanding the curvature of the bottom acts on the bottom portion of the U shape. . For this reason, the signal conductor is not lifted above the bottom, and is positioned so as to contact the top surface of the bottom. Therefore, when crimping so that both ends of the terminal forming piece are closed by the mold, a part of the signal conductor does not stick out between these both ends. As a result, the coupling between the signal conductor and the terminal forming piece is ensured, and the electrical connection between them is also ensured.

The crimping method according to the present invention is characterized by the following (2).
(2) Crimping the terminal forming piece of the chain terminal including the carrier and the flat terminal forming piece provided continuously at a plurality of positions in the longitudinal direction of the carrier to the signal conductor exposed in a part of the electric wire A crimping method for
Place the terminal forming piece whose both ends are bent inward from the other part on the lower mold of the first mold,
An angle formed by two surfaces, which are formed to bend the terminal forming piece in the upper die of the first die and are tapered toward the lower die and intersect at the deepest part thereof. The terminal forming piece is bent so that both end portions of the terminal forming piece are brought close to each other by the inner wall surface of the mold having an obtuse angle.
A crimping method characterized by that.

  According to the crimping method of the configuration of (2) above, at the beginning of crimping the terminal forming piece with the mold so as to wrap the signal conductor exposed from the electric wire, the taper surface of the mold lowers both ends of the terminal forming piece downward. While pressing, both end portions are pressed in a direction approaching each other. For this reason, in the process in which the terminal forming piece is deformed from the U shape to the cylindrical shape (O shape), a force in the direction of expanding the curvature of the bottom acts on the bottom portion of the U shape. . For this reason, the signal conductor is not lifted above the bottom, and is positioned so as to contact the top surface of the bottom. Therefore, when crimping so that both ends of the terminal forming piece are closed by the mold, a part of the signal conductor does not stick out between these both ends. As a result, the coupling between the signal conductor and the terminal forming piece is ensured, and the electrical connection between them is also ensured.

  According to the present invention, when crimping so as to wrap the signal conductor of the electric wire placed on the terminal forming piece, a part of the electric wire including the signal conductor, the shield wire (shield conductor), and the outer skin from between both ends of the terminal forming piece Can keep out.

  The present invention has been briefly described above. Further, details of the present invention will be further clarified by reading through the modes for carrying out the invention described below with reference to the accompanying drawings.

It is a perspective view which shows the manufacturing process of the chain terminal concerning embodiment of this invention. It is sectional drawing of the state which crimped the electric wire shown in FIG. 1 with the terminal formation piece. It is explanatory drawing which shows the process process of the chain terminal concerning embodiment of this invention. It is explanatory drawing which shows the detail of the crimping process which crimps an electric wire in FIG. 3 with a terminal formation piece. It is explanatory drawing which shows the caulking process of finishing implemented following the caulking process shown in FIG. It is explanatory drawing which shows the crimping | compression-bonding process of the wire barrel of the conventional shielded electric wire. It is explanatory drawing which shows the unsuitable crimping deformation process of the conventional wire barrel.

  Hereinafter, a crimping method according to an embodiment of the present invention will be described with reference to FIGS. 1 to 5.

  The chain terminal of the present embodiment shown in FIG. 1 has a carrier 11 and terminal-forming pieces 12 on a flat plate connected to a plurality of locations in the longitudinal direction of the carrier 11. The terminal forming piece 12 is formed as a terminal by press molding, and the tip end portion of the signal conductor 14 of the electric wire 13 is accommodated in the terminal forming piece 12 bent at the time of the press forming. Further, the terminal forming pieces 12 are continuously provided at a plurality of locations in the longitudinal direction of the carrier 11 through carrier tabs 15.

  The signal conductor 14 is formed by bundling a plurality of core wires 14a. The front end portion of the signal conductor 14 is placed at the center of the terminal forming piece 12, and the left and right end portions of the terminal forming piece 12 are bent toward the signal conductor 14 at the placement portion. Clamped on.

  In this case, each end of the terminal forming piece 12 is pressed so as to be interposed between an upper mold and a lower mold as will be described later, and the core wires 14a of the signal conductor 14 are compressed so that there is substantially no gap. The Thereby, both ends of the terminal forming piece 12 are in a state where the signal conductor 14 in which the core wire 14a is kept in the compressed state is crimped. For this reason, the signal conductor 14 does not protrude from each end portion, and is held in the bent terminal forming piece 12 as shown in FIG. 2 shows the case where the number of the core wires 14a of the signal conductor 14 is seven, the present invention is not limited to this number, and the present invention can be applied even when there is only one. it can.

  Next, with reference to FIG. 3, the process in which the chain terminal of embodiment of this invention is shape | molded is demonstrated with the change of the shape of the terminal. 3A to 3F are diagrams illustrating a series of steps in which the chain terminal of the embodiment of the present invention is press-molded.

  First, as shown in FIG. 3A, a flat metal plate is placed on a first press-cutting die block and pressed, and as shown in FIG. A rectangular terminal forming piece 12 connected to one end extending in the longitudinal direction is formed. At this time, the terminal forming piece 12 connects the terminal forming piece main body 12a and the carrier 11 by enclosing the signal conductor 14 of the electric wire 13 by press molding, which will be described later. The carrier jumper 15 and a pair of contacts 12b extending from one end facing the side opposite to the carrier 11 side of the terminal forming piece main body 12a. The contact 12b is tapered toward the tip, and forms a truncated cone shape by caulking described later. Further, the contact 12b forms the tip of the terminal (the part that contacts the counterpart terminal) when the terminal forming piece 12 becomes a terminal. Hereinafter, in the terminal forming piece 12 connected to the carrier 11 via the carrier jumper 15, the contact 12b side is referred to as a front end side, and the side close to the carrier 11 is referred to as a rear end side.

  Thereafter, the terminal forming piece 12 press-cut by the first die block for press cutting is placed on the second die block for press molding and pressed. In FIG. 3B, the terminal forming piece 12 has both sides sandwiching the carrier joint 15 of the terminal forming piece main body 12a and the center where the two contacts 12b are connected to the carrier joint 15 of the terminal forming piece main body 12a. It can be bent. At this time, the cross section of the terminal forming piece 12 is formed in a substantially U shape in which both sides of the terminal forming piece main body 12a are erected from both ends of the center when the center of the terminal forming piece main body 12a is the bottom.

  Further, the terminal forming piece 12 press-molded by the second mold block is arranged on the third mold block for press molding and further pressed. In FIG.3 (c), the terminal formation piece 12 has the half of the front end side of the terminal formation piece main body 12a closed. That is, the terminal forming piece main body 12a is press-molded so that approximately half of the end portions on both sides of the terminal forming piece main body 12a are close to each other. On the other hand, almost half of the rear end side of the terminal forming piece main body 12a is in an open state, that is, both sides of the terminal forming piece main body 12a are from both ends of the center of the terminal forming piece main body 12a, as in FIG. Each has a substantially U shape.

  Furthermore, in FIG.3 (d), the signal conductor 14 exposed in the end of the electric wire 13 is arrange | positioned on the rear end of the terminal formation piece main body 12a. At this time, substantially half of the rear end side of the terminal forming piece main body 12a is in an open state above, so that the signal conductor 14 can be disposed at the center of the terminal forming piece main body 12a.

  Thereafter, the signal conductor 14 is press-molded by the third mold block, and the terminal-forming piece 12 placed on the terminal-forming piece main body 12a is disposed on the fourth mold block for press-molding, and further pressed. Is done. As shown in FIG. 3 (e), the terminal forming piece 12 is closed at substantially half of the rear end side of the terminal forming piece main body 12 a on which the signal conductor 14 of the electric wire 13 is arranged. That is, the terminal forming piece main body 12a is formed so that the substantially half of the rear end side of both end portions of the terminal forming piece main body 12a is brought closer.

  The terminal forming piece 12 is formed in the shape of a terminal at the same time as the signal conductor 14 of the electric wire 13 is connected to the terminal forming piece main body 12a through the steps shown in FIGS. Thereafter, the terminal forming pieces 12 press-formed by the fourth die block are arranged on the fifth die block for press cutting, and both sides of the carrier jumper 15 in the carrier 11 as shown in FIG. Is cut off. Thus, the terminal 16 connected to the signal conductor 14 of the electric wire 13 is formed.

  As described above, in the chain terminal according to the embodiment of the present invention, the step of pressing the terminal forming piece 12 into the shape of the terminal and the step of connecting the terminal and the signal conductor 14 of the electric wire 13 are performed by a series of press forming. be able to. That is, unlike the conventional case, it is not necessary to take out a terminal formed by press molding from a mold and place the terminal in a terminal crimping apparatus including an anvil and a crimper. For this reason, when producing the electric wire with which the terminal was assembled | attached, the efficiency of the operation | work can be aimed at.

  By the way, in the process of FIG.3 (d) mentioned above, after the signal conductor 14 exposed from the end of the electric wire 13 is mounted in the U-shaped part each standingly arranged from the right-and-left both ends of the terminal formation piece main body 12a center, As shown in FIG. 3 (e), crimping is performed with both ends closed. In the process of closing both ends, the core wires 14a are closely overlapped to reduce the overall outer diameter of the signal conductor 14, and the signal conductor 14 is closely attached to the U-shaped upper portion of the terminal forming piece body 12a. .

  FIG. 4A to FIG. 4C are diagrams more specifically showing the caulking process of the terminal forming piece body 12 with respect to the signal conductor 14 as described above. In this caulking step, the upper mold 18 and the lower mold 19 are used. The upper die 18 has a pair of inner wall surfaces (tapered surfaces) 18a that expand downward in an inverted V shape on the lower surface thereof. The depth and width of the inverted V shape forming these mold inner wall surfaces 18a are designed according to the size of the terminal forming piece 12 to be crimped, the cross-sectional area of the signal conductor 14, and the like. Usually, the target shape and the same angle are formed with respect to a vertical plane passing through an intersection line (extending in the direction toward the paper surface) L where the two inner wall surfaces (tapered surfaces) 18a intersect. The angle formed by the opposite V-shaped inner mold wall surfaces 18a is set to an obtuse angle of 90 degrees or more. In this way, when both ends of the terminal forming piece 12 are crimped, the inner wall surface 18a of the die is compressed vertically downward (in the direction of arrow P) with respect to each end of the terminal forming piece 12 supported by the lower die 19. The force and the urging force in the direction in which each end portion of the terminal forming piece 12 faces (directions of arrows Q1 and Q2) can be simultaneously applied. At this time, both end portions of the terminal forming piece 12 are bent pieces 12d that are bent inward with respect to other portions of the terminal forming piece 12. For this reason, the pressing force of the mold inner wall surface 18a acts on these bent pieces 12d, so that both end portions of the terminal forming piece 12 can be smoothly bent vertically downward and in a direction facing each other.

  On the other hand, the lower mold 19 is installed at a position vertically below the upper mold 18, and a pair of arc-shaped inner walls 19 a are formed on the surface facing the upper mold 18 with the position facing the intersection line L as the center. A vertical inner wall surface 19b that forms a vertical surface continuous with the arc-shaped inner wall surface 19a and a horizontal bottom mold inner wall surface 19c that forms a horizontal bottom are formed continuously with each vertical inner wall surface 19b. These arc-shaped inner wall surface 19a, vertical inner wall surface 19b and horizontal bottom inner wall surface 19c form a recess D. The recess D supports the terminal forming piece 12 at a central position on the lower mold 19 so as not to be displaced. For this reason, the terminal forming piece 12 is integrally formed with a convex portion E having a rectangular cross-sectional shape portion that fits gently into the concave portion D.

  With such a mold (upper mold 18 and lower mold 19), the terminal forming piece 12 is crimped to the signal conductor 14 as follows. First, as shown in FIG. 4A, the terminal forming piece 12 in which a bent piece 12 d that is bent inward from other portions is formed on the lower mold 19. At this time, the convex portion E having the rectangular cross section of the terminal forming piece 12 is inserted and supported on the lower mold 19 so that the terminal forming piece 12 is not displaced. Then, as shown in FIG. 3 (d), after placing the signal conductor 14 of the electric wire 13 at the center of the terminal forming piece 12 bent into a substantially U shape, the upper mold 18 is lowered. As the upper die 18 descends, the inner wall surfaces 18a of the upper die 18 having an inverted V shape come into contact with the left and right end portions of the terminal forming piece 12, and further, these end portions are compressed downward. Go. At the time of the compression operation by the upper mold 18, in addition to the compression force in the direction indicated by the arrow P, the pinching force in the directions Q1 and Q2 where the end portions of the terminal forming pieces 12 face each other is a terminal in contact with each inner wall surface 18a. It acts on each end of the forming piece 12. For this reason, caulking is started so that each end portion of the terminal forming piece 12 wraps the entire signal conductor 14 of the electric wire 13 placed on the central portion of the terminal forming piece 12 by the lowering of the upper mold 18. . At the start of this caulking, the bottom of the terminal forming piece 12 bent into a U-shape is narrow, and the signal conductor 14 of the electric wire 13 is in a state of floating from the bottom surface 12 c of the terminal forming piece 12.

  Subsequently, when the upper die 18 is further lowered, each inner wall surface 18a of the upper die 18 compresses each end portion of the terminal forming piece 12 in the direction of arrow P, and the arrows Q1 that these end portions face each other. , Press in the Q2 direction. The terminal forming piece 12 receives the compressive force in the direction of the arrow P and the clamping pressure in the directions of Q1 and Q2, and the vicinity of both ends of the convex portion E having a rectangular cross section is deformed as shown in FIG. At the same time, the end surfaces of the terminal forming pieces 12 approach each other so as to approach each other (see FIG. 4B). As the terminal forming piece 12 is deformed, a part of the core wire 14a of the signal conductor 14 is pushed down so as to be in contact with the bottom surface 12c of the terminal forming piece 12, and the signal conductors 14 are gradually brought into close contact with each other. As a result, any one of the core wires 14a is enclosed inside the U-shaped terminal forming piece 12, and does not protrude from each end of the terminal forming piece 12 during the caulking process.

  Furthermore, when the upper mold | type 18 is lowered | hung, each core wire 14a will contact more strongly and closely. Therefore, the signal conductor 14 of the electric wire 13 is stored so as to be completely wrapped in the terminal forming piece 12 as shown in FIG. 4C without protruding from between the respective ends of the terminal forming piece 12. It becomes.

  Next, the terminal forming piece 12 with the signal conductor 14 crimped as described above is separated from the lower mold by raising the upper mold 18, and a separate finishing mold as shown in FIG. 21 is used to tighten more firmly so as to have a substantially circular cross section. A mold 21 shown in FIG. 5 is composed of an upper mold 22 and a lower mold 23, a lower mold inner wall surface 22 a is formed on the lower surface of the upper mold 22, and the lower mold inner wall surface 22 a is formed on the upper surface of the lower mold 23. An upward mold inner wall surface 23a having the same shape and the same size is formed (the press molding by the finishing mold 21 is also included in the press molding by the fourth mold block in FIG. 3 (e)). The downward mold inner wall surface 22a and the upward mold inner wall surface 23a are directed to positions facing each other in the vertical direction.

  Therefore, after the terminal forming piece 12 in which the signal conductor 14 removed from the lower mold 19 shown in FIG. 4 is crimped on the upward inner wall surface 23a of the lower mold 23 is installed as shown in FIG. 5 (a), The upper die 22 is lowered and the terminal forming piece 12 is pressed toward the lower die 23 by the downward die inner wall surface 22a. As a result, the terminal forming piece 12 is deformed into a circular shape as shown in FIG. 5B along the shape of the downward mold inner wall surface 22a and the upward mold inner wall surface 23a.

  Thus, the signal conductor 14 and the terminal forming piece 12 formed by the upper mold 22 and the lower mold 23 have a circular cross-sectional shape as shown in FIG. 1, and the core wires 14a are brought into close contact with the terminal forming piece 12 and the inside thereof. Terminals are formed. Moreover, in the terminal obtained in this way, since the electric wire 13 does not protrude during the caulking process as described above, it is possible to realize the desired mechanical strength and electrical connection.

  As described above, according to the mold and the pressure bonding method of the present embodiment, the upper mold 18 in which the angle formed by the pair of mold inner wall surfaces (tapered surfaces) 18a expanding in an inverted V shape is set to an obtuse angle. It is crimped. Thereby, at the beginning of crimping the terminal forming piece by the mold so as to wrap the signal conductor exposed from the electric wire, both ends of the terminal forming piece are pressed while the taper surface of the mold presses the both ends of the terminal forming piece downward. Press in directions toward each other. For this reason, in the process in which the terminal forming piece is deformed from the U shape to the cylindrical shape (O shape), a force in the direction of expanding the curvature of the bottom acts on the bottom portion of the U shape. . For this reason, the signal conductor is not lifted above the bottom, and is positioned so as to contact the top surface of the bottom. Therefore, when crimping so as to close both ends of the terminal forming piece with a mold, a part of the electric wire 13 including the core wire 14a of the signal conductor, the shield wire (shield conductor), and the outer skin is eaten between the both ends. There is no such thing as getting stuck. As a result, the coupling between the signal conductor and the terminal forming piece is ensured, and the electrical connection between them is also ensured. This becomes more prominent when the terminal-forming piece 12 is formed with the bent piece 12d bent inward than the other portions.

DESCRIPTION OF SYMBOLS 11 Carrier 12 Terminal formation piece 12a Terminal formation piece main body 12b Contact 12c Bottom surface 12d Bending piece 13 Electric wire 14 Signal conductor 15 Carrier jumper 16 Terminal 18 Upper mold | type 18a Inner wall surface 19 Lower mold | type 19a Arc-shaped inner wall surface 19b Vertical inner wall surface 19c Horizontal bottom mold inner wall 21 Mold 22 Upper mold 22a Downward mold inner wall 23 Lower mold
23a Upward inner wall
D Concave part E Convex part

Claims (2)

An upper portion for crimping the terminal forming piece of the chain terminal provided with a carrier and flat terminal forming pieces provided at a plurality of positions in the longitudinal direction of the carrier to the signal conductor exposed at a part of the electric wire. A mold having a mold and a lower mold,
The upper mold has a mold inner wall surface for bending the terminal forming piece,
The inner wall surface of the mold expands in a tapered shape toward the lower mold, and an angle formed by two surfaces of the inner wall surface of the mold that intersects at the deepest portion is an obtuse angle.
A mold characterized by that. Crimping for crimping the terminal forming piece of the chain terminal provided with a carrier and flat terminal forming pieces provided continuously at a plurality of positions in the longitudinal direction of the carrier to the signal conductor exposed in a part of the electric wire A method,
Place the terminal forming piece whose both ends are bent inward from the other part on the lower mold of the first mold,
An angle formed by two surfaces, which are formed to bend the terminal forming piece in the upper die of the first die and are tapered toward the lower die and intersect at the deepest part thereof. The terminal forming piece is bent so that both end portions of the terminal forming piece are brought close to each other by the inner wall surface of the mold having an obtuse angle.
A crimping method characterized by that.

Images