JP4250103B2 - Crimping device - Google Patents

Description

  The present invention relates to a crimp terminal provided with a core wire barrel that is crimped to a core wire (for example, a central conductor) of a cable (for example, a coaxial cable), and the crimp terminal mounted on a fixed lower mold anvil, and a movable upper crimper. The present invention relates to a crimping apparatus that lowers (or punches) and plastically deforms the core wire barrel to crimp the core wire.

  Conventional crimp terminals and crimping devices have been formed, for example, as shown in FIG. 4 or FIG.

In the conventional example shown in FIG. 4, as shown in FIG. 4A, the core wire barrel 102 of the crimp terminal 100 is formed in a U-shaped cross section, and the anvil 112 of the crimp device 110 mounts the core wire barrel 102 thereon. The groove 114 is formed as an arc-shaped shallow groove, and the crimper 116 of the crimping device 110 is lowered so that the bottom surface of the deep groove 118 that becomes the pressing surface of the core wire barrel 102 connects the two arc portions 120 at the center. The shape is 122.
Then, the core wire barrel 102 of the crimp terminal 100 is placed in the mounting groove 114 of the anvil 112, the core wire 12 of the coaxial cable 10 is inserted into the core wire barrel 102, the crimper 116 is lowered, and the core wire barrel 102 is plastically deformed. Then, it was crimped to the core wire 12 of the coaxial cable 10, and an F crimp-shaped crimping structure as shown in FIG. 4B was formed.

In the conventional example shown in FIG. 5, as shown in FIG. 5A, the core wire barrel 202 of the crimp terminal 200 is formed in a substantially U-shaped cross section, and the outer surface of the upper half is a U-shaped lower half. The inner side surface is linearly extended from the connection part of the part, and the inner surface is formed in a shape that is inclined outwardly from the connection part of the lower half of the U shape.
Further, in the anvil 212 of the crimping device 210, a mounting groove 214 for placing the core wire barrel 202 is formed in an arc-shaped shallow groove, and the crimper 216 of the crimping device 210 descends to become a pressing surface of the core wire barrel 202. The bottom surface of 218 is formed in a semicircular shape.
Then, the core wire barrel 202 of the crimp terminal 200 is placed in the placement groove 214 of the anvil 212, the core wire 12 of the coaxial cable 10 is inserted into the core wire barrel 202, the crimper 216 is lowered, and the core wire barrel 202 is plastically deformed. Then, it was crimped to the core wire 12 of the coaxial cable 10 to form a Ω crimp-shaped crimping structure as shown in FIG. 5B (see Patent Document 1).
JP-A-8-315886 (paragraph numbers “0013” to “0020”, FIG. 1 (a), FIG. 5)

However, the conventional example shown in FIG. 4 has the following problems (1) to (3). In particular, when the coaxial cable 10 is an ultra-fine coaxial cable (for example, the cross-sectional area of the core wire 12 is 0.005 mm ² ) and highly reliable crimping is required at the crimping portion between the center conductor and the core wire barrel of the coaxial connector. It was a problem.

  (1) Since the core wire barrel 102 of the crimp terminal 100 is formed in a U-shaped cross section, as shown by a one-dot chain line in FIG. A part of (for example, two) pops out and the compression rate decreases. The compression rate represents the ratio of the cross-sectional area inside the crimping to the conductor cross-sectional area (before crimping) of the core 12.

  (2) When the crimper 116 is lowered and the core wire barrel 102 is crimped to the core wire 12, the crimping portions 105 and 105 of the core wire barrel 102 corresponding to the divided portions of the crimper 116 and the anvil 112 (adjacent locations of the crimper 116 and the anvil 112). Stress concentrates on the surface, and a crack 107 as shown in FIG. 4B is generated, the compressive force is reduced, and corrosion occurs.

  (3) When the crimper 116 is lowered and the core barrel 102 is crimped to the core wire 12, the lower end surface of the crimper 116 is lowered below the upper end surface of the anvil 112. The anvil 112 is worn and workability is reduced. Further, the contact portion of the crimp terminal 100 is twisted due to the left and right non-uniformity of the core wire barrel 102.

Also, the conventional example shown in FIG. 5 has the same problems as the conventional example of FIG. 4 as described in the above (1) to (3).
For example, since the core wire barrel 202 of the crimp terminal 200 is formed in a U-shaped cross section, a part of the seven strands 14 to 14 pops out during the crimping operation, and the crimping rate decreases or the crimper 216 and the anvil 212 The stress is concentrated on the crimping portions 205 and 205 of the core wire barrel 202 corresponding to the divided portions, cracks are generated, the core wire barrel 202 is caught between the anvil 212 and the shallow wall 218, and the anvil 212 is bitten. There was a problem that the workability deteriorated due to wear.

  The present invention has been made in view of the above-described problems, and a crimp terminal and a crimp that can ensure a predetermined compression rate (for example, 70 to 80%), suppress generation of cracks, and improve workability. An object is to provide an apparatus.

According to the first aspect of the present invention, a substantially rectangular bottom plate (42) whose plate surface is parallel to the axial direction of the core wire (12) of the cable (10), and a vertical connection from both sides of the bottom plate (42) to the upper side. A crimp terminal having a core wire barrel (32) provided with at least two side plates (44) (46) arranged in a staggered manner along the axial direction of the core wire (12) on the anvil (60). A crimping device that is placed in the placing groove (62), lowers the crimper (70), and crimps the core wire barrel (32) to the core wire (12), and forms the upper surface of the anvil (60) on a flat surface, The mounting groove (62) is formed in a square groove with a flat bottom surface and capable of accommodating the bottom of the core wire barrel (32). The width and height of the core wire barrel (32) after crimping are W and H1, and the bottom plate The thickness of (42) and the side plates (44) (46) is t, and the number of strands of the core wire (12), the strands Is n (n is an integer of 2 or more) and d, W and H1 satisfy the following expressions (1) and (2), and K1 in the expressions (1) and (2) is 0. The coefficient is set in the range of 6 to 1.0.
W = (2 × t + n × d) × K1 (1)
H1 = (2 × t + d) × K1
(2)

In the second aspect of the present invention, when the groove depth of the mounting groove (62) is H2, this H2 satisfies the following equation (3), and K2 in the equation (3) is 0.8-1 The coefficient is set within the range of.
H2 = t × K2 (3)

According to a third aspect of the present invention, a portion facing the mounting groove (62) on the lower surface of the crimper (70) is formed in an arc-shaped shallow groove having a radius of curvature R, and R is expressed by the following equation (4). It is satisfied, and K1 in the formula (4) is a coefficient set within a range of 0.6 to 1.0.
R = W × K1 (4)

According to a fourth aspect of the present invention, both side surfaces of the mounting groove (62) are formed into inclined surfaces inclined at an angle θ from the surface perpendicular to the bottom surface of the mounting groove (62).
Is set within a range of 5 ° to 20 °.

The core wire barrel includes a bottom plate and at least two side plates. The two side plates are connected substantially vertically upward from both sides of the bottom plate, and are staggered along the axial direction of the core wire on both sides of the bottom plate. Because it is arranged, part of the core wire can be prevented from jumping out of the core wire barrel during crimping by the crimping device, and the compression rate can be prevented from being lowered. A state can be made favorable.

A crimping device for crimping a crimp terminal to a core wire, wherein the upper surface of the anvil is formed into a flat surface, the mounting groove is formed into a square groove that has a flat bottom surface and can accommodate the bottom of the core wire barrel, The bottom part of the core wire barrel is formed in a square shape close to the mounting groove, and the width W and height H1 of the core wire barrel after crimping are W = (2 × t + n × d) × K1, H1 = (2 × t + d). ) × K1 is satisfied, and K1 is set within the range of 0.6 to 1.0, so that the following effects (1), (2), and (3) are obtained.

(1) Since at least two side plates of the core wire barrel are arranged in a zigzag pattern along the axial direction of the core wire on both sides of the bottom plate, a part of the core wire is prevented from jumping out of the core wire barrel during crimping. In addition, it is possible to prevent the compression ratio from being lowered, and it is possible to improve the coupling state with the core wire without serration.
(2) Since the bottom portion of the core wire barrel after crimping is formed in a square shape close to the mounting groove, all the strands of the core wire can be brought into contact with the core wire barrel in a substantially horizontal row after crimping. A highly reliable crimped state can be ensured at the crimping portion of the barrel.
(3) The upper surface of the anvil is a flat surface, the mounting groove is formed into a square groove, and the lower end surface of the crimper is positioned above the upper end surface of the anvil when the crimper is crimped to the core wire of the core wire barrel. Since the core wire barrel is sandwiched between the crimper and the anvil, the anvil does not wear. For this reason, the workability | operativity fall by the contact of a crimper and an anvil can be prevented, and the twist of a core barrel with respect to the contact part of a crimp terminal can be prevented.

In the invention according to claim 2 , the depth H2 of the mounting groove is set within a range of 0.8 to 1.2 times the thickness t of the bottom plate and the side plate, and the bottom portion of the core wire barrel after crimping is set to the mounting groove. Therefore, it is possible to suppress the occurrence of cracks by avoiding stress concentration on the crimped portion of the core wire barrel corresponding to the divided portion of the crimper and the anvil.

According to a third aspect of the present invention, a portion corresponding to the mounting groove on the lower surface of the crimper is formed in an arcuate shallow groove having a radius of curvature of approximately R, and this R is in the range of 0.6 to 1.0 of W. Since the upper portion of the core barrel after crimping is formed in a sector shape with a radius of curvature of approximately R, the effect of the invention of claim 3, 4 or 5 can be further improved.

In the invention according to the fourth aspect, since both side surfaces of the mounting groove are formed on inclined surfaces inclined outward by an angle θ (= 5 ° to 20 °), the core wire barrel can be easily mounted on the mounting groove. Can be improved.

1 to 3 show one embodiment of a crimping terminal and a crimping apparatus according to the present invention. In these drawings, reference numeral 10 denotes a microcoaxial cable as an example of a cable (for example, a microcoaxial having a conductor cross-sectional area of 0.005 mm ² ). , 30 is a crimp terminal, and 60 and 70 are anvils and crimpers of the crimping device.

  As shown in FIGS. 1 and 2, the coaxial cable 10 includes a core wire (center conductor) 12 composed of seven strands 14 (diameter d (for example, d = 0.05 mm)), and an outer periphery of the core wire 12. Are formed of an insulator 16, an outer conductor 18 and an insulating sheath 20, which are sequentially coated concentrically, and the tip end of the core wire 12 protrudes for crimping.

The crimp terminal 30 is, for example, a crimp terminal used for a plug of a coaxial connector compatible with SMT (surface mounting technology), and includes a core wire barrel 32 and a contact portion 34 as shown in FIGS.
The core wire barrel 32 is formed such that the lateral width w of the bottom portion thereof is slightly smaller than W, which will be described later, in order to enable accommodation in the mounting groove 62, which will be described later.
The contact portion 34 is connected to a carrier 38 via a bridge 36, and a feed hole 40 is formed in the carrier 38.
The core barrel 32, the contact portion 34, the bridge 36, the carrier 38, and the feed hole 40 are formed by punching and bending a conductive metal plate having a plate thickness t (mm).

The core wire barrel 32 is connected to a substantially rectangular bottom plate 42 whose plate surface is parallel to the axial direction of the core wire 12, and is connected to the both sides of the bottom plate 42 while being rounded upward from both sides of the bottom plate 42. The side plates 44 and 46 are arranged in a staggered manner along the axial direction of the core wire 12. For this reason, the side plates 44 and 46 and the bottom plate 42 connected thereto have a substantially L-shaped cross section perpendicular to the axial direction of the core wire 12 and a shape in which the left and right sides of the L shape are reversed.
The side plates 44 and 46 are formed to have an inclined surface that is substantially W in height from the upper surface of the bottom plate 42 and approaches the inner surface as the outer surface of the distal end portion becomes closer to the distal end.
The side plates 44 and 46 are formed with arc-shaped notches 48 and 50 for confirming the core wire 12 at the time of crimping.

The contact portion 34 has a substantially rectangular shape whose plate surface is parallel to the axial direction of the core wire 12, and a bottom plate 52 smoothly connected to the bottom plate 42, and is provided continuously rounded upward from both sides of the bottom plate 52. The side plates 54 and 56 face each other.
The side plates 54 and 56 are formed so as to approach each other toward the tip in order to make elastic contact with a contact portion (for example, pin contact) of a mating connector (for example, a receptacle of a coaxial connector compatible with SMT), and the cross section is arcuate. Is formed.

The anvil 60 is positioned and fixed to an anvil block (not shown) by bolts, and the upper surface thereof is formed flat as shown in FIG. 1, and the core wire barrel 32 of the crimp terminal 30 is placed at a predetermined position. A placement groove 62 is formed.
The mounting groove 62 has a flat bottom surface, a width of W, a groove depth of h (h = H2, H2 will be described later), and an inclination angle to the outside of the side wall surface of θ ° (θ ° is 5 ° to 20 °). (Set within the range of °).

  The crimper 70 is fixed to a crimper holder (not shown) by a bolt, and as shown in FIG. 1, the lower surface is formed flat, and a pressing surface 72 is formed at a position facing the mounting groove 62 of the anvil 60, The pressing surface 72 is formed in an arcuate shallow groove having a radius of curvature R.

Next, the crimping operation of the crimping terminal 30 by the crimping apparatus will be described.
(1) The crimp terminal 30 is sent onto the mounting groove 62 of the anvil 60 by a feed mechanism (not shown), and the coaxial cable 10 is similarly sent onto the crimp terminal 30 as shown in FIGS. The core wire 12 is set at a predetermined position between the side plates 44 and 46 of the core wire barrel 32.

  (2) Next, the crimper 70 is lowered as shown by an arrow in FIG. 1A, and the bottom plate 42 of the core wire barrel 32 is guided into the mounting groove 62 of the anvil 60, and the side plates 44 and 46 are bent inward to fold the core wire 12. Is held in a temporarily fixed state. At this time, since the side plates 44 and 46 are arranged in a staggered manner on both sides of the bottom plate 42, a part of the strands 14 to 14 is prevented from jumping out of the core wire barrel 32.

(3) Next, the bridge 36 is cut by a movable cutter (not shown), the carrier 38 is cut, the crimper 70 is further lowered and reaches the bottom dead center, the core wire barrel 32 is crimped, and the core wire 12 is crimped. A crimped state as shown in FIG.
When the crimper 70 reaches the bottom dead center, the lower surface of the crimper 70 approaches the upper surface of the anvil 60 but does not come into contact therewith, so that the crimper 70 and the anvil 60 do not come into contact with each other and wear. This prevents the workability from being lowered due to the contact between the anvil 60 and the twist of the core wire barrel 32 with respect to the contact portion 34.

As shown in FIG. 1B, the core barrel 32 after crimping has a fan-shaped cross section.
Specifically, the width, height, and side surface inclination of the bottom of the core wire barrel 32 are angles W (mm), H2 (mm), and θ (°), and the total height of the core wire barrel 32 after crimping is H1 (mm ) And the curvature radius of the upper surface is R (mm), W, H1, H2, and R are regulated by the following equations (1), (2), (3), and (4), and θ is 5 ° to It is set within a range of 20 °.
W = (2 × t + n × d) × K1 (1)
H1 = (2 × t + d) × K1 (2)
H2 = t × K2 (3)
R = W × K1 (4)
In the above formulas (1), (2), (3), (4), n represents the number of strands 14 constituting the core wire 12 (7 in FIG. 1, generally an integer of 2 or more), and K1 , K2 represents a coefficient set within the range of 0.6 to 1.0 and 0.8 to 1.2, and the center point O of R is a core barrel after crimping as shown in FIG. 32 on the central axis C.

In (3), W, H1, H2, and R are regulated by the formulas (1), (2), (3), and (4), and θ is regulated within the range of 5 ° to 20 °. The following effects (a) to (d) are obtained.
(A) Since the bottom part of the core wire barrel 32 after crimping is formed in substantially the same shape as the mounting groove 62, all the strands 14 to 14 of the core wire 12 can be brought into contact with the core wire barrel 32 in a substantially horizontal row. A predetermined compression rate (for example, 70% to 80%) can be secured, and a highly reliable crimped state (connected state) can be secured at the crimping portion between the core wire 12 and the core wire barrel 32.
(B) The bottom portion of the core wire barrel 32 after crimping is formed in substantially the same shape as the mounting groove 62, and cracks are generated by avoiding stress concentration on the crimping portion of the core wire barrel 32 corresponding to the divided portions of the anvil 60 and crimper 70. Can be prevented.
(C) By tilting both wall surfaces of the mounting groove 62 to the outside by an angle θ (= 5 ° to 20 °), the core wire barrel 32 can be easily mounted on the mounting groove 62 and workability can be improved.
(D) Since the pressing surface 72 of the lower surface of the crimper 70 against the core wire barrel 32 is an arc-shaped shallow groove whose radius of curvature R is regulated by the expression (4), the upper portion of the core wire barrel 32 after crimping is formed into a fan shape. The effects (a) to (c) can be further improved.

  (4) Next, the crimper 70 is raised to return to the initial state, and the crimping terminal 30 is removed from the mounting groove 62 of the anvil 60 with the coaxial cable 10, whereby the core of the crimping terminal 30 is attached to the tip of the core 12 of the coaxial cable 10. A part to which the barrel 32 is crimped is completed.

In the embodiment, in order to facilitate the placement of the core wire barrel 32 in the placement groove 62 and to facilitate the bending of the side plates 44 and 46 by the lowering of the crimper 70, the side plates 44 and 46 and the bottom plate 42 are Although the case where the continuous portion is formed in a substantially vertical shape with roundness and the outer side surface of the tip portion of each side plate 44, 46 is formed as an inclined surface has been described, the present invention is not limited to this.
For example, it can be used when the connecting portions of the side plates 44 and 46 and the bottom plate 42 are formed substantially vertically without roundness, or when the outer side surfaces of the side plates 44 and 46 are formed parallel to the inner side surface. it can.

  In the above-described embodiment, there has been described the case where the side plates 44 and 46 for preventing the wire 14 from jumping out during crimping are arranged in a staggered manner on both sides of the bottom plate 42, but the present invention is not limited to this. Also, it can be used in the case of three or more side plates for preventing the strands 14 from jumping out during crimping, which are arranged in a staggered manner on both sides of the bottom plate 42.

  In the embodiment, in order to facilitate placement of the core wire barrel 32 with respect to the placement groove 62 and to improve workability, both side surfaces of the placement groove 62 are inclined at an angle θ (5 ° to 20 °) outward. Although the case where it is formed on the surface has been described, the present invention is not limited to this, and the present invention can also be used when both side surfaces of the coaxial cable 10 are formed on surfaces substantially perpendicular to the bottom surface.

In the above-described embodiment, the pressing surface 72 of the crimper 70 is formed in an arc-shaped shallow groove, and the upper portion of the core wire barrel 32 after crimping is formed in a fan shape, thereby further improving the function and effect of the invention. Although described, the present invention is not limited to this.
For example, the pressing surface 72 of the crimper 70 is formed in a V-shaped shallow groove, a flat surface shape, or a protruding shape having a chevron shape, and the upper portion of the core barrel 32 after crimping is correspondingly formed in a chevron shape and a flat shape. Or it can utilize also about the case where it forms in V shape. Among these, when the pressing surface 72 of the crimper 70 is formed in a V-shaped shallow groove and the upper portion of the core barrel 32 after crimping is formed in a chevron shape, the embodiment (example of fan shape) Similar effects can be achieved.

  In the above-described embodiment, the bottom of the core wire barrel 32 after crimping is formed in substantially the same shape as the mounting groove 62, so that stress concentration on the crimping portion of the core wire barrel 32 is avoided and cracking is effectively prevented. Although the depth H2 of the groove 62 is regulated by the expression (3), the present invention is not limited to this, and the depth of the mounting groove 62 is set to a value larger than H2 (for example, 1.3 × t). It can also be used in the case where it is set to a small value (for example, 0.7 × t).

  In the above-described embodiment, the case where the coaxial cable 10 is an ultrafine coaxial cable has been described in order to more effectively exhibit the operational effects of the present invention. However, the present invention is not limited to this, and a general-purpose coaxial cable or a general-purpose cable is used. It can also be used in the case of a cable (electric wire).

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a first embodiment of the present invention, where (a) is a cross-sectional view of a main part for explaining a crimping action to a core wire barrel 32 by a crimping device, and (b) is a cross section for explaining the shape of the core wire barrel 32 after crimping. FIG. 1A is a perspective view for explaining a state in which the core wire 12 of the coaxial cable 10 is set in the core wire barrel 32 of the crimp terminal 30. FIG. It is an enlarged view of the crimp terminal 30 part in FIG. 2, (a) is a side view, (b) is a top view. It is a figure explaining a prior art example, (a) is principal part sectional drawing explaining the crimping effect | action to the core wire barrel 102 by a crimping | compression-bonding apparatus, (b) is sectional drawing explaining the shape of the core wire barrel 102 after crimping | compression-bonding. It is a figure explaining another prior art example, (a) is principal part sectional drawing explaining the crimping effect | action to the core wire barrel 202 by a crimping | compression-bonding apparatus, (b) is sectional drawing explaining the shape of the core wire barrel 202 after crimping | compression-bonding. is there. It is the partially expanded sectional view which expanded a part of AA line cross section of 4. FIG.

Explanation of symbols

10 ... Coaxial cable (an example of a cable)
DESCRIPTION OF SYMBOLS 12 ... Core wire 14 ... Elementary wire 30 ... Crimp terminal 32 ... Core wire barrel 42 ... Bottom plate 44, 46 ... Side plate 60 ... Anvil 62 ... Mounting groove 70 ... Crimper 72 ... Pressing surface

Claims (4)

A substantially rectangular bottom plate (42) whose plate surface is parallel to the axial direction of the core wire (12) of the cable (10) and an upper side of the bottom plate (42) are connected substantially vertically upwards, and the axis of the core wire (12) A crimping terminal having a core wire barrel (32) having at least two side plates (44) (46) arranged in a staggered manner along a direction is placed in a placement groove (62) on an anvil (60). A crimping device for lowering the crimper (70) and crimping the core wire barrel (32) to the core wire (12), wherein the upper surface of the anvil (60) is formed into a flat surface, and the mounting groove (62) is formed The bottom surface of the core wire barrel (32) is formed into a square groove that can accommodate the bottom of the core wire barrel (32). The width and height of the core wire barrel (32) after crimping are W and H1, and the bottom plate (42) and side plate (44). The thickness of (46) is t, the number of strands of the core wire (12), and the strand diameter is n (n is an integer of 2 or more). ) And d, W and H1 satisfy the following formulas (1) and (2), and K1 in the formulas (1) and (2) is within the range of 0.6 to 1.0. A crimping apparatus characterized by having a set coefficient.
W = (2 × t + n × d) × K1 (1)
H1 = (2 × t + d) × K1
(2) When the groove depth of the mounting groove (62) is H2, this H2 satisfies the following equation (3), and K2 in the equation (3) is set within the range of 0.8 to 1.2. The crimping apparatus according to claim 1, wherein the coefficient is a coefficient.
H2 = t × K2 (3) A portion facing the mounting groove (62) on the lower surface of the crimper (70) is formed in an arc-shaped shallow groove having a radius of curvature R, and this R satisfies the following equation (4), The crimping apparatus according to claim 1 or 2, wherein K1 is a coefficient set within a range of 0.6 to 1.0.
R = W × K1 (4) Both side surfaces of the mounting groove (62) are formed into inclined surfaces inclined at an angle θ from the surface perpendicular to the bottom surface of the mounting groove (62).
Is set within a range of 5 ° to 20 °.

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