JP6602227B2 - Caulking device and shield wire manufacturing method - Google Patents

Description

  The present invention relates to a caulking device for caulking and fixing a cylindrical caulking member to the outer periphery of a predetermined object, and a method for manufacturing a shielded electric wire.

  Conventionally, a method of caulking and fixing a cylindrical caulking member to the outer periphery of a predetermined object has been proposed. For example, one of the conventional crimping devices (hereinafter referred to as “conventional device”) is a shielded electric wire provided with a covered electric wire and a braided conductor (a cylindrical body knitted with copper wire or the like) covering the covered electric wire. On the other hand, a cylindrical grounding metal fitting (such as a shield terminal and a caulking sleeve) for grounding the braided conductor is caulked and fixed (for example, see Patent Document 1).

  More specifically, the conventional device corresponds to each side of the crimped shape (hexagonal cylindrical shape) when pressurizing and deforming into a hexagonal cylindrical crimped shape with a pair of dies sandwiching the grounding bracket. Each mold surface is provided with a protrusion protruding toward the mold space. By this protrusion, a crimping point (appearance is a depression) where the grounding metal bites into the braided conductor is formed, and the reliability of the electrical connection between the braided conductor and the grounding metal fitting is increased. Furthermore, the conventional apparatus has a thin plate-like convex portion for preventing intrusion on the mating surface of one mold in order to prevent the metal fitting for grounding from entering the mating surface of the mold (and as a result, the occurrence of burrs). And a recess into which the projection is inserted and accommodated is provided on the mating surface of the other mold.

JP 2011-171057 A

  By the way, in the above-described conventional apparatus, although it is possible to prevent the occurrence of burrs on the caulking member (grounding metal fitting), in the caulking process, the mold base material (for example, the concave portion) in which the thin plate-like convex portion defines the concave portion. May come into contact with the inner side). Even if such contact occurs, the function itself of preventing the occurrence of burrs is not immediately lost. However, in consideration of wear and deformation of the thin plate-like convex portion due to such contact, there is a possibility that the replacement frequency of the die is increased as compared with a simple structure die having no thin plate-like protrusion. As a result, although it is possible to prevent the occurrence of burrs, there is a possibility that the cost related to the caulking process (and thus the manufacturing cost of the shielded wire) may increase.

  As can be understood from the above description, the concern regarding the above-described mold replacement frequency is that the object to be caulked by the caulking member (the shield that would caulk the grounding metal fitting in the case of a conventional device). It can occur regardless of the electric wire). For example, in a caulking device for caulking a grounding metal fitting to a shielded electric wire as in the conventional device, a caulking device for caulking a terminal having a cylindrical contact portion (so-called closed barrel) to a conductor of a covered electric wire The same concern as above may also occur.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to prevent the occurrence of burrs when caulking and fixing a cylindrical caulking member to a predetermined object, and the cost associated with caulking processing. It is providing the caulking apparatus which can achieve both reduction of this, and the manufacturing method of the shielded electric wire using the caulking apparatus.

In order to achieve the above-described object, the “caulking device” according to the present invention is characterized by the following (1) to (4).
(1)
A caulking device for caulking and fixing a cylindrical caulking member to the outer periphery of a predetermined object,
Having a first mold and a second mold that are pressure-deformed into a polygonal cylindrical caulking shape by sandwiching the caulking member in a direction intersecting the axis thereof;
At least one of the first mold and the second mold is
Of the mold surfaces corresponding to the side surfaces of the caulking shape, the adjacent mold surface adjacent to the mating surface of the first mold and the second mold projects toward the mold space and the adjacent A projecting rotating body that is rotatable relative to a mold surface around an axis parallel to the axis
It must be a caulking device.
(2)
In the caulking device described in (1) above,
The first mold and the second mold are:
On a mold surface different from the adjacent mold surface, there is a protruding portion that protrudes toward the mold space and does not rotate relative to the mold surface, or the protruding rotating body,
It must be a caulking device.
(3)
In the crimping apparatus according to (2) above,
The caulking shape is a hexagonal cylindrical shape,
Each of the first mold and the second mold is
Three of the six mold surfaces corresponding to each side surface of the caulking shape are provided, and the protrusion-like rotation is provided on two adjacent mold surfaces of the three mold surfaces. And having the protrusion on one mold surface different from the adjacent mold surface among the three mold surfaces.
It must be a caulking device.
(4)
In the caulking device according to any one of (1) to (3) above,
The object is
A shielded electric wire comprising a covered electric wire and a tubular braided conductor covering the covered electric wire,
The caulking member is
A cylindrical grounding member fixed by caulking to the braided conductor.
It must be a caulking device.

  According to the caulking device having the above configuration (1), when the caulking with the first mold and the second mold is performed, the protruding rotating body provided on the adjacent mold surface is the caulking member (and the object). ) And can be plastically deformed, and can be relatively moved while rotating (rolling) on the outer peripheral surface of the caulking member. Therefore, compared with the case where a simple protrusion is provided as in the conventional device, the force for pressing the caulking member in the direction approaching the mating surface is reduced. This is because rolling friction (and rolling friction force as a result) occurs at the contact point between the protrusion-like rotating body and the caulking member, whereas in the conventional apparatus, the protrusion does not rotate and slips at the contact point. This is due to the occurrence of friction (and the resulting sliding frictional force). As is well known, regarding the dynamic friction force, if the conditions other than the difference between the rolling movement and the sliding movement are the same, the rolling friction force is much smaller than the sliding friction force. Therefore, the caulking device of this configuration can prevent the occurrence of burrs on the caulking member as compared with the conventional device.

  Furthermore, the protrusion-like rotating body is less likely to be damaged due to its structure than the thin plate-like convex portion in the conventional apparatus. Therefore, the caulking device of this configuration can reduce the replacement frequency of the mold as compared with the conventional device.

  Therefore, the caulking device of this configuration can achieve both prevention of burrs when the cylindrical caulking member is caulked and fixed to a predetermined object, and reduction of costs related to the caulking process.

  According to the caulking device having the configuration of (2) above, when the protrusion is provided on the mold surface different from the adjacent mold surface, when there is no protrusion (the mold surface is flat). In comparison, the connection strength between the caulking member and the object can be increased by the amount of the protrusions that press the caulking member against the object. On the other hand, in the case where the protrusion-like rotating body is provided on a mold surface different from the adjacent mold surface, the caulking member is based on the same principle as in the above (1) as compared with the case where a simple protrusion is provided. Burr generation can be prevented more reliably. Therefore, the caulking device of this configuration can improve the connection strength by caulking and further reliably prevent the occurrence of burrs on the caulking member.

  According to the caulking device having the configuration (3), the caulking member is caulked into a hexagonal cylindrical shape. Generally, as the number of vertices in the cross-section of the crimped shape (polygonal cylindrical shape) increases, the cross-section of the crimped shape approaches a circle. At this time, for example, when the shape of the caulking member before processing is a cylinder, the shape change due to caulking decreases as the caulking shape after processing approaches a circle, and the connection strength due to caulking decreases. . On the other hand, as the number of vertices in the cross-section of the crimped shape decreases, the shape change at the time of crimping increases, and the object (shielded wire in the case of a conventional device) may be damaged. According to experiments conducted by the inventor in consideration of the above, it has been confirmed that if the caulking shape is a hexagonal cylindrical shape, the connection strength by caulking and the prevention of breakage of the object can be realized in a well-balanced manner. It was. Therefore, the caulking device of this configuration can both prevent the occurrence of burrs and reduce the cost, and also achieve both the connection strength by caulking and the prevention of breakage of the object.

  According to the caulking device having the configuration of the above (4), in caulking and fixing between the braided conductor of the shielded electric wire and the grounding member, it relates to prevention of burrs on the grounding member and caulking processing to the shielded electric wire. It is possible to achieve both cost reduction.

Furthermore, in order to achieve the above-described object, the “shielded wire manufacturing method” according to the present invention is characterized by the following (5).
(5)
A method of manufacturing a shielded electric wire having a covered electric wire, a tubular braided conductor covering the covered electric wire, and a grounding member fixed by crimping to the braided conductor,
The grounding member includes a cylindrical shield terminal and a cylindrical crimping sleeve,
Placing the shield terminal at the open end of the braided conductor through which the covered wire is inserted; and
A caulking sleeve is arranged so that the open end of the braided conductor is folded outward in the radial direction and the folded open end is sandwiched between the outer peripheral surface of the shield terminal and the inner peripheral surface of the caulking sleeve. Process,
Including pressurizing and deforming the caulking sleeve into a polygonal cylindrical caulking shape by sandwiching the caulking sleeve between the first mold and the second mold in a direction intersecting the axis thereof,
At least one of the first mold and the second mold is
Of the mold surfaces corresponding to the side surfaces of the caulking shape, the adjacent mold surface adjacent to the mating surface of the first mold and the second mold projects toward the mold space and the adjacent A projecting rotating body that is rotatable relative to a mold surface around an axis parallel to the axis;
It is a manufacturing method of a shielded wire.

  According to the method for manufacturing a shielded electric wire having the above configuration (5), as in the above (1), the protruding rotating body provided on the adjacent mold surface when caulking with the first mold and the second mold. However, it can move relatively while rotating (rolling) on the outer peripheral surface of the grounding member while pressing and grounding the grounding member (and the braided conductor of the shielded wire). Therefore, compared with the case where a simple protrusion is provided as in the conventional device, the force for pressing the grounding member in the direction approaching the mating surface is reduced. This is due to the magnitude relationship between rolling friction (and the resulting rolling friction force) and sliding friction (and the resulting sliding friction force). Therefore, according to the manufacturing method of the shielded electric wire of this structure, compared with the manufacturing method using the conventional apparatus, a shielded electric wire can be manufactured, preventing the burr | flash generation to the member for grounding. Furthermore, the protrusion-like rotating body is less likely to be damaged due to its structure than the thin plate-like convex portion in the conventional apparatus. Therefore, the manufacturing method of the shielded electric wire of this structure can reduce the replacement frequency of a metal mold | die compared with the manufacturing method using the conventional apparatus.

  Therefore, the manufacturing method of the shielded electric wire of this configuration can achieve both prevention of burrs when the braided conductor of the shielded electric wire is caulked and fixed to the cylindrical grounding member and reduction of the cost related to the caulking process. It is.

  According to the present invention, it is possible to prevent occurrence of burrs when caulking and fixing a cylindrical caulking member (for example, a grounding member for a shielded electric wire) to a predetermined object (for example, a braided conductor of a shielded electric wire), It is possible to provide a caulking device that can achieve both cost reduction related to the caulking process and a method for manufacturing a shielded wire using the caulking device.

  The present invention has been briefly described above. Further, details of the present invention will be further clarified by reading a form for carrying out the invention described below (hereinafter referred to as “embodiment”) with reference to the accompanying drawings.

FIG. 1 is a schematic perspective view of a shielded electric wire with a grounding member manufactured using a crimping apparatus according to an embodiment of the present invention. FIG. 2 is a first diagram for explaining a manufacturing process of the shielded wire shown in FIG. FIG. 3 is a second view for explaining the manufacturing process of the shielded wire shown in FIG. FIG. 4 is a schematic view showing a main cross section of a mold of a caulking device according to an embodiment of the present invention, FIG. 4 (a) shows a state before caulking, and FIG. 4 (b) is after caulking. Shows the state. FIG. 5 is a schematic diagram showing a main cross section of a mold of a conventional apparatus, FIG. 5 (a) shows a state before caulking, and FIG. 5 (b) shows a state after caulking. FIG. 6 is a diagram for explaining that a relatively large dynamic friction force (sliding friction force) acts as a tangential force in the conventional apparatus. FIG. 7 is a diagram for explaining that a relatively small dynamic frictional force (rolling frictional force) acts as a tangential force in the caulking device according to the embodiment of the present invention. FIG. 8 is a main cross-sectional view corresponding to FIG. 4 of a caulking device according to a modification of the embodiment of the present invention, and FIG. 8A shows a case where the caulking shape is a square (square) cylinder. FIG. 8B shows a case where the caulking shape is an octagonal (regular octagonal) cylinder.

  Hereinafter, a caulking device according to an embodiment of the present invention and a method for manufacturing a shielded electric wire according to an embodiment of the present invention using the caulking device will be described with reference to the drawings.

<Configuration of shielded wire>
FIG. 1 shows a shielded electric wire 100 with a grounding member. Specifically, the shielded electric wire 100 includes a covered electric wire 10 (core wire 11 and insulator 12) and a tubular braided conductor 20 that covers the covered electric wire 10. A grounding member (shield terminal 30 and caulking sleeve 40) is caulked and fixed to the braided conductor 20 of the shielded electric wire 100, whereby the shielded electric wire 100 with an earthing member as shown in the overall image of FIG. Is manufactured.

  The shielded electric wire 100 in this example is formed so that the braided conductor 20 is exposed to the outside. However, the shielded electric wire 100 may further include an insulating sheath (sheath) that covers the outer periphery of the braided conductor 20 as necessary.

  The shield terminal 30 is a metal cylinder having a cylindrical shape, and is disposed in the vicinity of the open end of the braided conductor 20. Furthermore, the open end of the braided conductor 20 is folded back so as to cover the tip of the shield terminal 30. The crimping sleeve 40 is a metal cylinder having a cylindrical shape (hexagonal cylindrical shape in FIG. 1), and is fixed by crimping to the outer periphery of the braided conductor 20 that is folded as described above. A substantially hemispherical recess 41 is formed on each side surface of the crimping sleeve 40.

  As will be described in detail later, the caulking sleeve 40 has a cylindrical shape before being caulked and fixed as shown in FIG. 1 and is caulked by a caulking device 200 described later ( It is pressure-deformed into a hexagonal cylindrical shape by so-called hexagonal 6-point crimping). In other words, by caulking by the caulking device 200, the outer peripheral shape of the caulking sleeve 40 is formed into a hexagon (regular hexagon), and a substantially hemispherical recess 41 is formed at the center of each of the six side surfaces. The

  As described above, the caulking sleeve 40 is caulked and fixed to the braided conductor 20 (by hexagonal 6-point crimping), thereby preventing damage to the braided conductor 20 and the covered electric wire 10 due to excessive pressure deformation. A total of six depressions 41 formed on each of the two side surfaces realize balanced multipoint contact, and the connection strength between the braided conductor 20 and the shield terminal 30 and the reliability of the electrical connection are improved. The shield terminal 30 can be used as a ground member for releasing electromagnetic noise collected by the braided conductor 20 to a grounded object.

<Method of manufacturing shielded wire>
Next, a method for manufacturing the shielded electric wire 100 shown in FIG. 1 will be described with reference to FIGS.

  First, as shown in FIG. 2A, a covered electric wire 10 provided with a braided conductor 20 on the outer periphery, a cylindrical shield terminal 30, and a cylindrical caulking sleeve 40 are prepared. Next, as shown in FIG. 2B, in the vicinity of the open end 21 of the braided conductor 20 (more specifically, the position where the tip 31 of the shield terminal 30 is adjacent to the rear end of the open end 21). In addition, the shield terminal 30 is inserted and arranged. Next, as shown in FIG. 2C, the diameter of the open end 21 of the braided conductor 20 is increased.

  Next, as shown in FIG. 3A, the opening end portion 21 of the expanded braided conductor 20 is radially outward from the tip end portion 31 of the shield terminal 30 (the direction covering the outer peripheral surface of the shield terminal 30). To be wrapped. Thereby, the open end 21 of the braided conductor 20 is disposed on the outer periphery of the tip of the shield terminal 30 so as to cover the tip 31 of the shield terminal 30.

  Next, as shown in FIG. 3B, the caulking sleeve 40 is inserted and disposed on the outer periphery of the open end portion 21 of the folded braided conductor 20. As a result, a state is obtained in which the folded open end 21 is sandwiched between the outer peripheral surface of the distal end portion of the shield terminal 30 and the inner peripheral surface of the crimping sleeve 40.

  Next, as shown in FIG. 3C, the crimping sleeve 40 is crimped and fixed (hexagonal six-point crimping) to the open end 21 of the braided conductor 20. Thereby, as described above, the shielded electric wire 100 in which the shield terminal 30 is firmly fixed to the braided conductor 20 and is electrically connected is manufactured.

<Casting device>
Next, a caulking device 200 according to an embodiment of the present invention used for manufacturing the shielded electric wire 100 described above will be described with reference to FIGS. 4 to 7.

  As shown in FIG. 4, the caulking device 200 includes an upper die 50 (first mold) and a lower die 60 (second mold). The upper die 50 and the lower die 60 are respectively disposed above and below the crimping sleeve 40 in the state shown in FIG.

  Each of the upper die 50 and the lower die 60 has three mold surfaces 70. The three mold surfaces 70 have a pair of opposing vertices of hexagons (cross sections) located on the mating surfaces 51 and 61 when the mating surface 51 of the upper die 50 and the mating surface 61 of the lower die 60 are mated. Such a hexagonal cylindrical mold space is formed. Hereinafter, for convenience of explanation, the mold surface 70 adjacent to the mating surfaces 51 and 61 is referred to as an adjacent mold surface 71, and a mold surface 70 different from the adjacent mold surface 71 is referred to as a mold surface 72. It is preferable that the adjacent mold surface 71 is inclined with respect to the mating surfaces 51 and 61 (in other words, not a surface perpendicular to the mating surfaces 51 and 61) from the principle of burr prevention described later.

  Each of the upper die 50 and the lower die 60 includes two adjacent mold surfaces 71 and one mold surface 72. The adjacent mold surface 71 is inclined with respect to the mating surfaces 51 and 61, and the mold surface 72 is parallel to the mating surfaces 51 and 61.

  A cylindrical through hole 52 is formed at the center of each adjacent mold surface 71 of the upper die 50 so as to open in the adjacent mold surface 71 and extend in a direction perpendicular to the adjacent mold surface 71. In each through-hole 52, a cylindrical member 82 provided on the tip side so that the sphere 81 is rotatable and cannot be separated is fixed so that the sphere 81 (so-called ball indent) protrudes from the adjacent mold surface 71. ing. In other words, a sphere 81 that protrudes toward the mold space and is rotatable relative to the adjacent mold surface 71 is provided at the center of each adjacent mold surface 71 of the upper die 50.

  Similarly, a cylindrical through-hole 62 that opens in the adjacent mold surface 71 and extends in a direction perpendicular to the adjacent mold surface 71 is also formed in the central portion of each adjacent mold surface 71 of the lower die 60. Has been. A cylindrical member 82 having a sphere 81 (ball indent) is fixed to each through-hole 62 so that the sphere 81 protrudes from the adjacent mold surface 71. In other words, a sphere 81 that protrudes toward the mold space and is rotatable relative to the adjacent mold surface 71 is also provided at the center of each adjacent mold surface 71 of the lower die 60. Hereinafter, the sphere 81 is also referred to as a protruding rotator 81 for convenience.

  On the other hand, at the central part of each die surface 72 of the upper die 50 and the lower die 60, a protrusion 83 that protrudes in a hemispherical shape toward the die space (not like the protrusion-like rotator 81). , A simple protrusion). As described above, each of the upper die 50 and the lower die 60 has the protruding rotary bodies 81 on the two adjacent mold surfaces 71 of the three mold surfaces 70, and the three die surfaces 70. A protrusion 83 is provided on one mold surface 72 different from the adjacent mold surface 71.

  As described above, the upper die 50 and the lower die 60 are moved relatively close to each other in the vertical direction so as to sandwich the caulking sleeve 40 as shown by white arrows in FIG. While being pressure-deformed, the braided conductor 20 is crimped.

  Specifically, when caulking is started, first, six projections (four projecting rotating bodies 81 and two projecting portions 83) contact at six points at equal intervals in the circumferential direction on the outer periphery of the caulking sleeve 40. These six points are intensively pressed and are dented inward in the radial direction of the caulking sleeve 40. Along with this, the corresponding positions on the outer periphery of the shield terminal 30, the braided conductor 20, and the insulator 12 located inside the crimping sleeve 40 are also recessed inward in the radial direction.

  When the caulking further proceeds (when the upper die 50 and the lower die 60 are further moved in the vertical direction), the projections (the projecting rotary body 81 and the projecting portion 83) are completely buried in the caulking sleeve 40, and the caulking sleeve. The peripheral portions of the six depressions in 40 come into contact with the mold surface 70 around the protrusions (protruding rotator 81, protrusion 83).

  Then, as shown in FIG. 4B, at the time when the caulking is completed (when the mating surfaces 51 and 61 of the upper die 50 and the lower die 60 are in close contact with each other), almost the entire area of the six mold surfaces 70. It will be in the state which the outer peripheral surface of the crimping sleeve 40 contacted (contact | adhered) over this. As a result, as described above, the outer peripheral shape of the caulking sleeve 40 is formed into a hexagon (regular hexagon), and one hemispherical depression 41 is formed at the center of each of the six surfaces. (In other words, hexagonal 6-point pressure bonding is performed).

  Here, in the caulking device 200 according to the embodiment of the present invention, the protruding rotating bodies 81 are provided on the four adjacent mold surfaces 71. This makes it difficult for a portion of the crimping sleeve 40 to enter the portion A shown in FIG. 4B (a space between the mating surfaces 51 and 61, hereinafter referred to as “mating surface space”), and as a result. As a result, burrs are hardly generated in the caulking sleeve 40. This point will be described below in comparison with the conventional apparatus 900.

  As shown in FIG. 5A, in the conventional apparatus 900, the four adjacent mold surfaces 71 are only provided in that the protrusions 83 (simple protrusions) are provided on the four adjacent mold surfaces 71. This is different from the caulking device 200 according to the embodiment of the present invention in which the protruding rotating body 81 is provided. In other words, in the conventional apparatus 900, the protrusions 83 are provided on all six mold surfaces 70. In the following, attention is paid particularly to the contact point of the caulking sleeve 40 with the protrusion 83 of the adjacent mold surface 71.

  As shown in FIG. 6, the pressing force F received by the crimping sleeve 40 at the contact point with the projection 83 of the adjacent mold surface 71 of the conventional apparatus 900 acts in the central axis direction of the shielded electric wire 100 at the contact point. It can be divided into a component force F1 (hereinafter referred to as “centripetal force”) and a component force F2 (hereinafter referred to as “tangential force”) acting in the tangential direction at the contact point.

  The centripetal force F1 acts as a force that plastically deforms the caulking sleeve 40 into a desired caulking shape. On the other hand, the tangential force F2 can act as a force that pushes a part of the caulking sleeve 40 toward the mating surface space described above. Therefore, when the tangential force F <b> 2 is large, a part of the crimping sleeve 40 easily enters the mating surface space, and burrs are easily generated in the crimping sleeve 40.

  In the conventional apparatus 900, as shown in FIG. 6, the projection 83 provided on the adjacent mold surface 71 slides against the outer peripheral surface of the crimping sleeve 40 while pressing the crimping sleeve 40 to cause plastic deformation. It moves relative with accompanying. In other words, a relatively large dynamic friction force (sliding friction force) continues to act as the tangential force F2 in the caulking process. As a result, due to this relatively large tangential force F2, burrs are likely to occur in the portion B shown in FIG.

  On the other hand, as shown in FIG. 7, in the caulking device 200 according to the embodiment of the present invention, the projecting rotary body 81 provided on the adjacent mold surface 71 presses the caulking sleeve 40 to cause plastic deformation. In this manner, the caulking sleeve 40 can move relative to the outer peripheral surface of the caulking sleeve 40 without rolling. In other words, a relatively small dynamic friction force (rolling friction force) can act as the tangential force F2 in the caulking process. That is, the tangential force F2 in FIG. 7 is smaller than the tangential force F2 in FIG. Note that the rolling of the projecting rotator 81 occurs when the projecting rotator 81 receives a reaction force f2 of the tangential force F2. As a result, in the caulking device 200 according to the embodiment of the present invention, since the tangential force F2 is smaller than that in the conventional device 900 in which a relatively large dynamic friction force (sliding friction force) continues to act, the above-described burrs are generated. It becomes difficult.

  As described above, the mold surface 72 different from the adjacent mold surface 71 is parallel to the mating surfaces 51 and 61. Therefore, since the tangential force described above does not substantially act on the mold surface 72, it is not necessary to provide the protruding rotating body 81 for reducing the tangential force. Therefore, in the caulking device according to the embodiment of the present invention, the protrusion surface 83 (simple protrusion) is provided on the mold surface 72 where the protrusion-like rotating body 81 does not need to be provided.

<Action and effect>
According to the caulking device 200 according to the embodiment of the present invention and the method of manufacturing the shielded electric wire 100 with the grounding member using the caulking device 200, the protrusion provided on the adjacent mold surface 71 is the conventional device. It is not a protrusion 83 (simple protrusion) like 900 but a protrusion-like rotating body 81. The protrusion-like rotating body 81 can move relative to the outer peripheral surface of the crimping sleeve 40 while rolling without pressing the crimping sleeve 40 to be plastically deformed. In other words, a relatively small dynamic friction force (rolling friction force) can act as the tangential force F2 in the caulking process (see FIG. 7). Therefore, as compared with the conventional apparatus 900 in which a relatively large dynamic friction force (sliding friction force) continues to be applied, the tangential force F2 is reduced, so that burrs are less likely to occur in the crimping sleeve 40.

  Furthermore, the protrusion-like rotating body 81 is less likely to be damaged due to its structure than the thin plate-like convex portion employed by the conventional apparatus 900. Therefore, compared with the conventional apparatus 900, the replacement frequency of the mold can be lowered. Therefore, it is possible to achieve both suppression of the generation of burrs in the crimping sleeve 40 that is crimped and fixed to the shielded electric wire 100 and reduction of the manufacturing cost of the shielded electric wire 100.

  Further, a protrusion 83 is provided on a mold surface 72 different from the adjacent mold surface 71. Therefore, compared to the case where the protrusion 83 is not provided on the mold surface 72, the connection strength of the shield terminal 30 with respect to the braided conductor 20 is increased by the amount that can be crimped in more points.

  Furthermore, since the caulking shape is a hexagonal cylindrical shape, the connection strength by caulking and the prevention of breakage of the shielded electric wire 100 can be realized with a good balance. In addition, a protrusion 83 (simple protrusion) is provided on the mold surface 72 that does not require the protrusion-like rotating body 81 to reduce the tangential force. Therefore, the manufacturing cost of a metal mold | die can be reduced compared with the case where the protrusion-shaped rotary body 81 is provided in all six metal mold | die surfaces.

<Other aspects>
In addition, this invention is not limited to said each embodiment, A various modification is employable within the scope of the present invention. For example, the present invention is not limited to the embodiment described above, and modifications, improvements, and the like can be made as appropriate. In addition, the material, shape, dimensions, number, arrangement location, and the like of each component in the above-described embodiment are arbitrary and are not limited as long as the present invention can be achieved.

  For example, in the above embodiment, a protrusion 83 (simple protrusion) is provided on a mold surface 72 different from the adjacent mold surface 71. However, similarly to the adjacent mold surface 71, the projecting rotary body 81 may be provided on the mold surface 72. Further, the mold surface 72 may not be provided with a protrusion.

  Further, in the above-described embodiment, the protruding rotating body 81 is a sphere. However, the protrusion-like rotator 81 may be a rotator that can be relatively rotated about an axis parallel to the axis of the caulking sleeve 40, and may be a rugby ball-like rotator, for example, a cylindrical rotation. It may be a body.

  Furthermore, in the said embodiment, the crimping shape is a hexagonal cylinder shape. However, the caulking shape may be a polygonal cylindrical shape having three or more vertices in the cross section. For example, as shown in FIG. 8A, the caulking shape may be a square. In this case, all of the four mold surfaces are adjacent mold surfaces 71, and the projecting rotary body 81 is provided for all of the four adjacent mold surfaces 71.

  Further, as shown in FIG. 8B, the caulking shape may be an octagon (regular octagon). In this case, the protruding rotators 81 are provided on the four adjacent mold surfaces 71. On the other hand, the four mold surfaces 72 different from the adjacent mold surfaces 71 may be provided with the protrusions 83 (simple protrusions) or the protrusion-like rotating body 81. In this way, by providing the protrusion-like rotating body 81 on the mold surface 72 in addition to the adjacent mold surface 71, burrs in the crimping sleeve 40 are further less likely to occur due to the same principle as described above.

  Furthermore, in the said embodiment, although the member for grounding is comprised by two members, the shield terminal 30 and the crimping sleeve 40, a member for grounding may be comprised by one member.

Here, the features of the embodiments of the crimping device according to the present invention and the method for manufacturing the shielded electric wire are briefly summarized and listed in the following (1) to (5), respectively.
(1)
A caulking device (200) for caulking and fixing a cylindrical caulking member (40) to the outer periphery of a predetermined object (100),
Having a first mold (50) and a second mold (60) that are pressure-deformed into a polygonal cylindrical caulking shape with the caulking member (40) sandwiched in a direction intersecting the axis thereof,
At least one of the first mold and the second mold is
Of adjacent mold surfaces (71) adjacent to the mating surfaces (51, 61) of the first mold and the second mold among the mold surfaces (70) corresponding to the side surfaces of the crimped shape. A projecting rotary body (81) protruding toward the mold space and capable of rotating relative to the adjacent mold surface (71) around an axis parallel to the axis;
Caulking device.
(2)
In the caulking device described in (1) above,
The first mold (50) and the second mold (60) are:
A protrusion (83) that protrudes toward the mold space and does not rotate relative to the mold surface on the mold surface (72) different from the adjacent mold surface, or the protrusion-like rotating body ( 81)
Caulking device.
(3)
In the crimping apparatus according to (2) above,
The caulking shape is a hexagonal cylindrical shape,
Each of the first mold (50) and the second mold (60)
Three of the six mold surfaces (70) corresponding to each side surface of the caulking shape have three mold surfaces (71) and two adjacent mold surfaces (71 of the three mold surfaces). ) And the protrusion (83) on one mold surface (72) different from the adjacent mold surface of the three mold surfaces.
Caulking device.
(4)
In the caulking device according to any one of (1) to (3) above,
The object is
A shielded electric wire (100) comprising a covered electric wire (10) and a tubular braided conductor (20) covering the covered electric wire,
The caulking member is
It is a cylindrical grounding member (30, 40) fixed by caulking to the braided conductor (20).
Caulking device.
(5)
A shielded electric wire (100) having a covered electric wire (10), a tubular braided conductor (20) covering the covered electric wire, and a grounding member (30, 40) fixed to the braided conductor by crimping is manufactured. A way to
The grounding member includes a cylindrical shield terminal (30) and a cylindrical crimping sleeve (40),
Placing the shield terminal (30) at the open end (21) of the braided conductor through which the covered electric wire is inserted;
The open end (21) of the braided conductor is folded back radially outward, and the folded open end is sandwiched between the outer peripheral surface of the shield terminal (30) and the inner peripheral surface of the crimping sleeve (40). So as to arrange the caulking sleeve (40),
Pressurizing and deforming the caulking sleeve (40) into a polygonal cylindrical caulking shape by sandwiching the caulking sleeve (40) between the first mold (50) and the second mold (60) in a direction intersecting the axis thereof; Including
At least one of the first mold and the second mold is
Of adjacent mold surfaces (71) adjacent to the mating surfaces (51, 61) of the first mold and the second mold among the mold surfaces (70) corresponding to the side surfaces of the crimped shape. A projecting rotating body (81) protruding toward the mold space and relatively rotatable about an axis parallel to the axis with respect to the adjacent mold surface;
Manufacturing method of shielded wire.

10 Covered Wire 20 Braided Conductor 21 Open End 30 Shield Terminal (Grounding Member)
40 Caulking sleeve (grounding member)
50 Upper die (first mold)
51 Matching surface 60 Lower die (second mold)
61 Mating surface 70 Mold surface 71 Adjacent mold surface 72 Mold surface (mold surface different from adjacent mold surface)
81 Protruding rotator 83 Protruding part

Claims (5)

A caulking device for caulking and fixing a cylindrical caulking member to the outer periphery of a predetermined object,
Having a first mold and a second mold that are pressure-deformed into a polygonal cylindrical caulking shape by sandwiching the caulking member in a direction intersecting the axis thereof;
At least one of the first mold and the second mold is
Of the mold surfaces corresponding to the side surfaces of the caulking shape, the adjacent mold surface adjacent to the mating surface of the first mold and the second mold projects toward the mold space and the adjacent A projecting rotating body that is rotatable relative to a mold surface around an axis parallel to the axis;
Caulking device. The crimping device according to claim 1,
The first mold and the second mold are:
On a mold surface different from the adjacent mold surface, there is a protruding portion that protrudes toward the mold space and does not rotate relative to the mold surface, or the protruding rotating body,
Caulking device. The crimping device according to claim 2,
The caulking shape is a hexagonal cylindrical shape,
Each of the first mold and the second mold is
Three of the six mold surfaces corresponding to each side surface of the caulking shape are provided, and the protrusion-like rotation is provided on two adjacent mold surfaces of the three mold surfaces. And having the protrusion on one mold surface different from the adjacent mold surface among the three mold surfaces.
Caulking device. In the caulking device according to any one of claims 1 to 3,
The object is
A shielded electric wire comprising a covered electric wire and a tubular braided conductor covering the covered electric wire,
The caulking member is
A cylindrical grounding member fixed by caulking to the braided conductor.
Caulking device. A method of manufacturing a shielded electric wire having a covered electric wire, a tubular braided conductor covering the covered electric wire, and a grounding member fixed by crimping to the braided conductor,
The grounding member includes a cylindrical shield terminal and a cylindrical crimping sleeve,
Placing the shield terminal at the open end of the braided conductor through which the covered wire is inserted; and
A caulking sleeve is arranged so that the open end of the braided conductor is folded outward in the radial direction and the folded open end is sandwiched between the outer peripheral surface of the shield terminal and the inner peripheral surface of the caulking sleeve. Process,
Including pressurizing and deforming the caulking sleeve into a polygonal cylindrical caulking shape by sandwiching the caulking sleeve between the first mold and the second mold in a direction intersecting the axis thereof,
At least one of the first mold and the second mold is
Of the mold surfaces corresponding to the side surfaces of the caulking shape, the adjacent mold surface adjacent to the mating surface of the first mold and the second mold projects toward the mold space and the adjacent A projecting rotating body that is rotatable relative to a mold surface around an axis parallel to the axis;
Manufacturing method of shielded wire.

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