JP5534516B2 - Inner terminal molding method and inner terminal mold - Google Patents

Description

  The present invention relates to an inner terminal molding method and an inner terminal molding die for connecting an inner terminal to an end portion of a cable and molding an insulator on the inner terminal.

  The speed of signals handled in electronic circuits and the miniaturization of devices have dramatically increased, and various proposals have been made to support high-speed and high-density signal circuits in the connector field used for shielded cables. The structure of the connector used for such a shielded wire includes an inner terminal connected to the center conductor of the shielded cable, an outer terminal connected to the outer conductor of the shielded cable, and between these inner terminal and outer terminal. And a resin insulator provided (for example, see Patent Documents 1 and 2).

JP 2006-147223 A JP 2006-302790 A

  By the way, the insulator is attached by press-fitting the inner terminal. However, if the insulator is thinly formed to reduce the impedance, the insulator may be damaged during the press-fitting operation. Further, the inner terminal may be broken by press-fitting into the insulator.

  In order to avoid the trouble at the time of press-fitting work, a method of performing insert molding with a resin material on the inner terminal using a mold is conceivable.

  However, in the case of this insert molding, an inner terminal is attached to the center conductor of the shielded cable, a connection process is performed in which the inner terminal is crimped to the center conductor of the shielded cable, and then an insulator is inserted into the inner terminal. There was a need to perform a molding process. In recent years, improvement in production efficiency is also required in a method of forming an insulator by insert molding.

  This invention is made | formed in view of the situation mentioned above, The objective is to provide the shaping | molding method and inner terminal shaping | molding die of an inner terminal which can improve productivity significantly.

In order to achieve the above-described object, the method for forming an inner terminal according to the present invention is characterized by the following (1).
(1) A method for forming an inner terminal having an insulator on the outer periphery, wherein a core wire of a shield cable is attached to a crimping portion provided on the inner terminal, and the inner terminal is formed of a pair of molds with respect to the inner terminal By mounting the mold, the crimping portion is pressed by the mold to be crimped to the core wire, and a resin material is filled in an injection space of the inner terminal molding mold formed around the inner terminal. Molding the insulator.

In the method for forming an inner terminal having the above configuration (1), the inner terminal forming die comprising a pair of molds is attached to the inner terminal having the shield cable core wire attached to the crimping portion. The insulator can be molded by filling the injection space of the inner terminal mold formed around the inner terminal with a resin material.
In this way, the connection process of crimping and connecting the inner terminal to the core wire of the shielded cable and the molding process of insert molding the insulator on the inner terminal can be performed at the same time, which can greatly improve productivity. it can.
In addition, by mounting the inner terminal mold and filling the injection space with the resin material, the resin material can be heated by the heat of the resin material while the crimping portion of the inner terminal is crimped. This enables annealing to remove the residual stress in the crimping part, eliminates problems such as a decrease in crimping force due to springback in the crimping part, and connects the inner terminal to the core wire of the shielded cable with a good crimping force. Can do.

In order to achieve the above-described object, the inner terminal mold according to the present invention is characterized by the following (2).
(2) An inner terminal molding die for molding an inner terminal having an insulator on the outer periphery, and has a pair of molds that are abutted against each other with the inner terminal interposed therebetween, and the mold is provided on the inner terminal. A crimp recess that presses the crimping part to which the core wire of the shield cable is attached and crimps to the core wire, and a mold hole that forms an injection space around the inner terminal that can be filled with the resin material serving as the insulator. Is provided.

In the inner terminal molding die having the above configuration (2), the pair of dies are brought into contact with each other with the inner terminal interposed therebetween, whereby the crimping portion of the inner terminal is pressed by the die crimping recess to be crimped to the core wire of the shield cable. In addition, an injection space can be formed around the inner terminal by a pair of mold holes, and an insulator can be formed around the inner terminal by filling the injection space with a resin material. it can.
In other words, by using this inner terminal molding die, it is possible to simultaneously perform the connection process of crimping and connecting the inner terminal to the core wire of the shielded cable and the molding process of insert molding the insulator on the inner terminal. Can greatly improve the performance.
In addition, by mounting the inner terminal mold and filling the injection space with the resin material, the resin material can be heated by the heat of the resin material while the crimping portion of the inner terminal is crimped. This enables annealing to remove the residual stress in the crimping part, eliminates problems such as a decrease in crimping force due to springback in the crimping part, and connects the inner terminal to the core wire of the shielded cable with a good crimping force. Can do.

  ADVANTAGE OF THE INVENTION According to this invention, the shaping | molding method and inner terminal shaping | molding die of an inner terminal which can improve productivity significantly can be provided.

  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 in the edge part of the shielded cable with which the inner terminal was connected to the core wire. It is a fragmentary sectional view in the edge part of the shielded cable with which the inner terminal was connected to the core wire. It is a perspective view of a chain terminal-like inner terminal and a shield cable. It is a perspective view of the inner terminal in the state where the core wire of the shield cable was inserted into the crimping part. It is a perspective view explaining the mounting | wearing condition of the inner terminal shaping | molding die which concerns on embodiment of this invention to an inner terminal. It is sectional drawing of the inner terminal shaping | molding die which concerns on embodiment of this invention with which an inner terminal is mounted | worn. FIG. 7 is a view taken along line XX in FIG. 6. It is a perspective view explaining the mounting | wearing condition of the inner terminal shaping | molding die which concerns on embodiment of this invention to an inner terminal. It is sectional drawing of the inner terminal shaping | molding die concerning embodiment of this invention with which the inner terminal was mounted | worn. It is an arrow view of the YY line in FIG. It is the perspective view which carried out the cross sectional view of the inner terminal shaping | molding die concerning embodiment of this invention with which the inner terminal was mounted | worn. It is the perspective view which looked at the inner terminal shaping | molding die which concerns on embodiment of this invention with which resin material was filled into the injection | emission space. It is a perspective view of an inner terminal in the state where an upper mold was removed after hardening of a resin material.

  Hereinafter, an example of an embodiment according to the present invention will be described with reference to the drawings.

  First, an inner terminal molding method and an inner terminal molded by an inner terminal molding die according to the present invention will be described.

  FIG. 1 is a perspective view of an end portion of a shielded cable in which an inner terminal is connected to the core wire, and FIG. 2 is a partial cross-sectional view of the end portion of the shielded cable in which the inner terminal is connected to the core wire.

  As shown in FIGS. 1 and 2, the inner terminal 11 is connected to the shielded cable 1. The shielded cable 1 to which the inner terminal 11 is connected includes a core wire 2, an insulating layer 3 extruded and coated around the core wire 2, an external conductor 4 provided around the insulating layer 3, and a periphery of the external conductor 4. And a jacket 5 that is covered.

  The inner terminal 11 includes a connecting portion 11a, a crimping portion (barrel portion) 11b, and a main body portion (male tab portion) 11c. The crimp portion 11 b of the inner terminal 11 is crimped to the core wire 2 of the shielded cable 1, whereby the inner terminal 11 is connected to the core wire 2 of the shielded cable 1.

  The main body portion 11c of the inner terminal 11 is a portion formed by pressing a rectangular rectangular piece into a thin cylindrical shape with the longitudinal direction as the central axis, and serves as an inner terminal (female side terminal) of the mating connector. It is the part to be connected. Further, the main body 11c has a slit 11d that is formed when the main body 11c is formed into a thin cylindrical shape. The slit 11d is a cut extending in the longitudinal direction of the main body 11c. When the main body 11c is pressed into a cylindrical shape, one of the two ends of the rectangular piece is positioned above the other end. To do. That is, one is formed so as to cover the other end. By utilizing this slit 11d, the deformation of the body portion 11c during insert molding, which will be described later, can improve the adhesion to the mold and can be connected flexibly and smoothly to the inner terminal of the mating connector. To do. The slit 11d is a minute gap and is closed during the insert molding, and the synthetic resin, which is a resin material, does not leak into the main body 11c through the slit 11d.

  In addition, an insulator 21 formed of a synthetic resin is integrally provided on the main body portion 11c of the inner terminal 11. The insulator 21 has a circular cross section, and flanges 21a are formed at both ends thereof. Then, an outer terminal (not shown) formed in a cylindrical shape is put on the outer periphery of the insulator 21. The outer terminal is crimped to the outer conductor 4 of the shielded cable 1 to be conducted.

  Next, a method for forming the inner terminal 11 will be described.

  As shown in FIG. 3, the inner terminal 11 is supplied in the state of a chain terminal in which the connecting portion 11 a is connected to the carrier 12. In the state shown in FIG. 3, the crimping portion 11 b has a substantially U-shaped cross section, and the two pieces rising in the U-shape of the crimping portion 11 b are used for caulking and fixing the core wire 2 of the shielded cable 1. . The carrier 12 is provided with a fitting hole 13 in parallel in the longitudinal direction for fitting a convex portion (not shown) of a transport device such as a robot arm used when the connector is assembled. At the time of forming the inner terminal, the entire chain terminal is movable in a state where the convex portion of the transporting device is fitted in the fitting hole 13.

  Thus, a core wire attachment process is performed with respect to the inner terminal 11 supplied in the state of a chain terminal. It should be noted that the crimping portion 11b has a substantially U-shaped cross section by a separate press molding die with respect to the inner terminal 11 before the core wire mounting step, that is, before the inner terminal molding die 31 described later is mounted. Are press-molded in a thin cylindrical shape.

  Specifically, as shown in FIG. 4, the core wire 2 of the shielded cable 1 is inserted and arranged in the crimping part 11b. In addition, after arrange | positioning the core wire 2 of the shielded cable 1 to the crimping | compression-bonding part 11b, it is preferable to caulk the crimping part 11b lightly with a press molding die, and to hold the core wire 2 to the crimping | compression-bonding part 11b. This prevents the shielded cable 1 from falling off from the crimping part 11b.

  Next, a crimping / forming process is performed on the inner terminal 11 in which the core wire 2 of the shielded cable 1 is inserted into the crimping part 11b.

  Specifically, first, as shown in FIGS. 5 to 7, the inner terminal mold 31 is attached to the chain terminal-shaped inner terminal 11. The inner terminal molding die 31 includes an upper die 32 and a lower die 33. The upper die 32 and the lower die 33 are located between the end of the main body portion 11c of the inner terminal 11 on the connecting portion 11a side and in the middle of the main body portion 11c. It has a size and shape that covers a predetermined length from above and below.

  The upper mold 32 and the lower mold 33 have mold holes 32a and 33a that have the shape of the insulator 21 having the flange portions 21a at both ends when they are superposed in the vertical direction.

  The upper mold 32 and the lower mold 33 are semicircular holes 32b that form narrow circular holes in communication with the mold holes 32a and 33a at the end portion of the inner terminal 11 that is disposed on the intermediate portion side of the main body portion 11c. 33b. The inner diameter of these semicircular holes 32b and 33b (the inner diameter of the narrow circular hole) is such that when the intermediate portion of the main body portion 11c of the inner terminal 11 is interposed in the upper die 32 and the lower die 33, the intermediate portion of the main body portion 11c. The part can be pressurized in the vertical direction. That is, the semicircular holes 32b and 33b are formed in a semicircular shape having a diameter slightly smaller than the outer diameter of the main body portion 11c.

  Moreover, as shown in FIG. 7, the upper mold | type 32 has the crimper recessed part 32c connected to the type | mold hole 32a in the edge part arrange | positioned at the crimping | compression-bonding part 11b side of the inner terminal 11, and the lower mold | type 33 is An end of the inner terminal 11 disposed on the crimping portion 11b side has an anvil recess 33c communicating with the mold hole 33a. The crimper recess 32c of the upper mold 32 is formed in a shape in which two mountain-shaped recesses are connected, and is pressed from above against the two pieces rising above the crimping portion 11b of the inner terminal 11. The anvil recess 33c of the lower mold 33 is formed in a semicircular shape having substantially the same diameter as the arc-shaped portion of the crimping part 11b of the inner terminal 11, and the anvil recess 33c of the lower mold 33 includes an inner terminal An arc-shaped portion on the lower side of the 11-shaped U-shaped crimping portion 11b is disposed.

  The upper mold 32 is provided with a resin material (insulating material) injection hole 32d communicating with the mold hole 32a, and a molten resin material can be injected from the injection hole 32d.

  In order to mount the inner terminal molding die 31 composed of the upper die 32 and the lower die 33, first, as shown in FIGS. 5 to 7, the lower die 33 is raised, and the lower die 33 is moved to the inner terminal 11. It is arranged on the lower side.

  In this state, the upper die 32 is lowered and the upper die 32 is pressed against the lower die 33 as shown in FIGS. 8 to 10, and the main body portion 11 c of the inner terminal 11 is covered with the inner terminal molding die 31. In this way, as shown in FIG. 11, an injection space A including the upper mold 32 of the inner terminal mold 31 and the mold holes 32 a and 33 a of the lower mold 33 is formed around the main body portion 11 c of the inner terminal 11. Is done.

  Further, when the lower mold 33 and the upper mold 32 are brought into contact with each other, as shown in FIG. 10, the two pieces of the crimp portion 11 b of the inner terminal 11 whose lower side is held in the anvil recess 33 c of the lower mold 33 are The crimping portion 11b is crimped to the core wire 2 of the shielded cable 1 by being bent inward along the two mountain-shaped recesses of the crimper recess 32c.

  Moreover, the intermediate part of the main body part 11c of the inner terminal 11 is held by the semicircular holes 32b and 33b of the upper mold 32 and the lower mold 33, and elastically deforms so that the main body part 11c is reduced in diameter.

  Next, a molten resin material (insulating material) is injected into the injection space A from the injection hole 32d into the inner terminal mold 31 in which the upper mold 32 and the lower mold 33 are abutted with each other. The resin material injected into the injection space A spreads and fills the entire injection space A as shown in FIG.

  At this time, the crimper recess 32c and the anvil recess 33c of the upper mold 32 and the lower mold 33 press the end of the inner terminal 11 on the connecting portion 11a side of the main body 11c, and the half of the upper mold 32 and the lower mold 33 Since the circular holes 32b and 33b press the intermediate part of the main body part 11c of the inner terminal 11 from above and below, and the slit 11d of the main body part 11c of the inner terminal 11 is closed, the resin material filled in the injection space A Does not flow between the upper mold 32 and the lower mold 33 and the main body 11 c or through the main body 11 c and flow out of the inner terminal mold 31.

  Further, when the injection space A is filled with a molten resin material, the inner terminal 11 is heated by the filled molten resin material. Thereby, the stress which has arisen in the crimping | compression-bonding part 11b crimped | bonded to the main-body part 11c hold | maintained by the upper mold | type 32 and the lower mold | type 33, and the core wire 2 of the shield cable 1 is removed.

  When the resin material is cured after a predetermined time has elapsed, the upper mold 32 is raised and the lower mold 33 is lowered as shown in FIG.

  In this way, by removing the inner terminal molding die 31, the inner terminal 11 provided with the insulator 21 as shown in FIGS. 1 and 2 is insert-molded. 11 is crimped and connected to the core wire 2 of the shielded cable 1.

  Such insert molding is performed simultaneously or sequentially on each of the plurality of inner terminals 11 connected to the carrier 12, and finally the inner terminals 11 are separated from the carrier 12 at the connecting portion 11a. The connection part 11a may be separated from the carrier 12 at the time of crimping by the inner terminal mold 31 and insert molding. That is, the inner terminal mold 31 may be provided with a function of cutting the connecting portion 11a.

  As described above, according to the embodiment described above, the core wire 2 of the shield cable 1 is attached to the crimp portion 11 b of the inner terminal 11, and the inner terminal including the upper mold 32 and the lower mold 33 with respect to the inner terminal 11. By mounting the molding die 31, the crimping portion 11 b can be pressed by the upper die 32 and the lower die 33 to be crimped to the core wire 2, and the inner terminal molding die 31 formed around the inner terminal 11 can be pressed. The insulator 21 can be insert-molded by filling the injection space A with a resin material.

  Specifically, the upper die 32 and the lower die 33 are brought into contact with each other with the inner terminal 11 interposed therebetween, so that the crimp portion 11b of the inner terminal 11 is pressed by the crimper recess 32c of the upper die 32 and the anvil recess 33c of the lower die 33. Thus, the injection space A is formed around the inner terminal 11 by the mold holes 32a and 33a of the upper mold 32 and the lower mold 33, and a resin is formed in the injection space A. By filling the material, the insulator 21 can be formed around the inner terminal 11.

  In this way, the connection process of crimping and connecting the inner terminal 11 to the core wire 2 of the shielded cable 1 and the molding process of insert molding the insulator 21 on the inner terminal 11 can be performed at the same time. Can be improved.

  Also, the inner terminal molding die 31 composed of the upper die 32 and the lower die 33 is mounted, and the injection space A is filled with a molten resin material, thereby heating the crimping portion 11b of the inner terminal 11 in a crimped state. Can do. Thereby, annealing for removing the residual stress of the crimping part 11b can be performed, and problems such as a decrease in the crimping force due to the spring back in the crimping part 11b are eliminated, and the inner terminal 11 is connected to the core of the shielded cable 1 with a good crimping force. 2 can be connected.

  The present invention is not limited to the above-described embodiments, and modifications, improvements, etc. 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.

DESCRIPTION OF SYMBOLS 1 Shield cable 2 Core wire 11 Inner terminal 11b Crimp part 21 Insulator 31 Inner terminal shaping | molding die 32 Upper mold | type (type | mold)
32a mold hole 32c crimper recess (crimp recess)
33 Lower mold (mold)
33a Mold hole 33c Anvil recess (crimp recess)
A Injection space

Claims (2)

A method of forming an inner terminal having an insulator on the outer periphery,
By attaching the core wire of the shield cable to the crimping part provided in the inner terminal and attaching the inner terminal molding die consisting of a pair of molds to the inner terminal, the crimping part is pressed by the mold and the A method of forming an inner terminal, comprising: crimping a core wire and filling the resin material into an injection space of the inner terminal molding die formed around the inner terminal to mold the insulator. An inner terminal molding die for molding an inner terminal having an insulator on the outer periphery,
Having a pair of molds that face each other across the inner terminal;
The mold is provided with a crimp recess provided on the inner terminal and pressed against the core wire by pressing a crimp portion to which a core wire of a shield cable is attached, and a resin material serving as the insulator around the inner terminal. An inner terminal mold having a mold hole for forming a filling injection space.

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