JP2015050005A - Terminal part of coated electric wire and manufacturing method of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce in thickness of a mold resin to provide a downsized terminal part.SOLUTION: A terminal part 100 of a covered electric wire 1 has: an end part including an end edge of the covered electric wire 1; a connection terminal having a crimp part which is crimped to the end part; and a moisture absorption reaction type mold resin 120 which covers the terminal part 100 including the end part of the covered electric wire 1 and the crimp part of the connection terminal. The manufacturing method of the terminal part 100 comprises the steps of: leaving the terminal part 100 under a first atmosphere so that a specified quantity of moisture is adhered thereto; making the terminal 100 with the moisture adhered thereto touch a moisture absorption reaction type resin material of the mold resin; leaving the terminal part 100 touched with the resin material under a second atmosphere, which is lower in temperature and humidity than the first atmosphere, for a first prescribed time; and leaving the terminal part 100, which has been left for the first prescribed time, under a third atmosphere higher in temperature than the second atmosphere, for a second prescribed time, to remove a resin material that has been not reacted.

Description

  The present invention relates to a terminal portion of a covered electric wire to which a connection terminal is attached and a manufacturing method thereof.

  It is necessary to waterproof the coated electric wire used in a wet area such as an automobile so that moisture does not enter the insulating coating from its end. For this reason, a covered electric wire in which a molding process is applied to a terminal portion to which a terminal is conventionally attached is often used in a wet area (for example, see Patent Document 1 below). This molding process is generally performed by injection molding a resin into the cavity using a mold.

JP 2010-097704 A

  However, like the mold resin in the prior art disclosed in Patent Document 1 above, what is molded using a mold is, for example, a crimp portion of a connection terminal that is crimped to an end including the tip of a covered wire. It is necessary to manufacture with a thickness having a certain margin in consideration of manufacturing tolerances such as height tolerance and resin fluidity. For this reason, there is a limit to reducing the thickness of the end portion of the covered electric wire including the molded resin for cost reduction accompanying the reduction in the amount of resin used.

  An object of the present invention is to provide a terminal portion of a covered electric wire and a method for manufacturing the same, which can solve the above-described problems caused by the prior art and can reduce the thickness of the mold resin by reducing the thickness.

  The method of manufacturing a terminal portion of a covered electric wire according to the present invention includes: a covered electric wire; a connection terminal having a crimp portion to be crimped to an end portion of the covered electric wire; and an end portion of the covered electric wire and a crimp portion of the connection terminal. A method of manufacturing a terminal portion of a covered electric wire having a moisture absorption reaction type molding resin covering a terminal portion including the step of leaving the terminal portion in a first atmosphere and attaching a predetermined amount of moisture; and A step in which a moisture absorption reaction type resin material is brought into contact with the terminal portion to which the resin is attached, and a step in which the terminal portion in contact with the resin material is allowed to stand in a second atmosphere at a lower temperature and lower humidity than the first atmosphere for a first predetermined time. And a step of removing the unreacted resin material by allowing the terminal portion left for the first predetermined time to stand in a third atmosphere having a temperature higher than the second atmosphere for a second predetermined time. Features.

  According to the method for manufacturing a terminal portion of a covered electric wire according to the present invention, moisture is attached to the terminal portion including the end portion of the covered electric wire and the crimp portion of the connection terminal, and then the moisture absorption reaction type resin material is contacted. After allowing the resin material to harden in an atmosphere for a first predetermined time, leave it in a third atmosphere at a higher temperature than the second atmosphere for a second predetermined time to melt and remove the unreacted (uncured) portion of the resin material Therefore, the terminal portion can be sealed by forming a mold resin having a constant thickness along the surface shape of the terminal portion. As a result, the mold resin can be made thinner than the conventional one, and the size can be reduced. Since the mold resin is thin, it is possible to improve the productivity by shortening the curing time of the resin.

  In one embodiment of the present invention, the amount of water contained in the first atmosphere is greater than the amount of water contained in the second atmosphere.

  In another embodiment of the present invention, the method further includes a step of degreasing the terminal portion prior to the step of attaching the moisture.

  The terminal portion of the covered electric wire according to the present invention includes a covered electric wire, a connection terminal having a crimp portion to be crimped to an end portion of the covered electric wire, and an end portion including the end portion of the covered electric wire and the crimp portion of the connection terminal. A terminal part of a covered electric wire having a moisture absorption reaction type molding resin covering the substrate, which is manufactured by removing the unreacted resin material among the moisture absorption reaction type resin materials provided in the terminal part It is.

  According to the terminal portion of the covered electric wire according to the present invention, the same effects as those of the method for manufacturing the terminal portion of the covered electric wire can be achieved.

  According to the present invention, it is possible to reduce the size by reducing the thickness of the mold resin.

It is sectional drawing which shows the terminal part of the covered electric wire manufactured by the manufacturing method of the terminal part of the covered electric wire which concerns on one Embodiment of this invention. It is a top view which shows the connecting terminal which comprises a part of terminal part of the covered electric wire which concerns on the same embodiment. It is a flowchart which shows the manufacturing process procedure by the manufacturing method of the terminal part of the covered electric wire which concerns on the embodiment. It is sectional drawing which shows the terminal part of the covered wire | conductor which concerns on the same embodiment for every manufacturing process.

  Hereinafter, a terminal portion of a covered electric wire and a method for manufacturing the same according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

  Drawing 1 is a sectional view showing the terminal part of a covered electric wire manufactured by the manufacturing method of the terminal part of a covered electric wire concerning one embodiment of the present invention. 2 is a plan view showing a connection terminal constituting a part of the terminal portion of the covered electric wire, FIG. 3 is a flowchart showing a manufacturing process procedure according to a method for manufacturing the terminal portion of the covered electric wire, and FIG. It is sectional drawing which shows a terminal part for every manufacturing process.

  As shown in FIG. 1, the terminal portion 100 of the covered electric wire 1 has a connection terminal 110 connected to the covered electric wire 1. The covered electric wire 1 includes a core wire 1a formed by collecting a plurality of elongated conductors, and an insulating cover 1b made of an insulating resin that covers the periphery of the core wire 1a and insulates and protects the core wire 1a from the outside.

  As shown in FIG. 2, the connection terminal 110 is formed by punching or bending a plate-shaped metal base material, and an electric wire crimping portion 111 for crimping and connecting the covered electric wire 1 to the connection terminal 110. A contact piece portion 112 is provided on the distal end side of the wire crimping portion 111 and fixed to the connection terminal 110 by contacting a counterpart connection terminal such as a ground terminal.

  The wire crimping portion 111 of the connection terminal 110 is provided so as to stand up when not crimped, and the insulation coating crimp that fixes the coated wire 1 to the connection terminal 110 by crimping the insulation coating 1b of the coated wire 1 from the periphery. It has a piece 111a. The wire crimping portion 111 is also provided so as to stand upright, and includes a core wire crimping piece 111b that crimps the core wire 1a of the covered wire 1 from the periphery and fixes the covered wire 1 to the connection terminal 110. Furthermore, the electric wire crimping portion 111 has a plate-like connecting portion 111c that connects and connects between the insulating coating crimping piece 111a and the core wire crimping piece 111b.

  The tip of the contact piece portion 112 of the connection terminal 110 is formed in, for example, a circular flat plate, and a circular screw insertion hole 112a through which a screw for screwing together with the counterpart connection terminal is formed at the center thereof. And the terminal part 100 of the covered electric wire 1 is further covered and sealed with the mold resin 120 given to the connection terminal 110, as shown in FIG.

  The mold resin 120 provided in the terminal portion 100 is made of a so-called moisture absorption reaction type resin material. The mold resin 120 includes the tip of the core wire 1a exposed from the end of the insulation coating 1b from the end of the insulation coating 1b of the covered electric wire 1 on the base end side of the connection terminal 110. Up to the plate-like portion 113 of the connection terminal 110 is sealed with a substantially constant thickness along the surface shape of the terminal portion 100 including the wire crimping portion 111. Therefore, the mold resin 120 prevents water from entering the covered electric wire 1 including the space between the insulating coating 1b and the core wire 1a from the end of the covered electric wire 1.

  Next, with reference to FIG. 4 with reference to FIG. 3, the manufacturing process of the terminal unit according to the present embodiment will be described. FIG. 3 is a flowchart illustrating a manufacturing process procedure according to the method for manufacturing the terminal portion of the covered electric wire according to the present embodiment, and FIG. 4 is a cross-sectional view illustrating the terminal portion of the covered electric wire for each manufacturing process. First, the terminal part 100 which crimped | bonded the covered electric wire 1 which exposed the core wire 1a from the insulation coating 1b, and the electric wire crimping | compression-bonding part 111 of the connecting terminal 110 is prepared, and as shown to Fig.4 (a), the terminal part 100 is made into 1st. A predetermined amount of moisture is allowed to adhere to the terminal unit 100 by being left in one atmosphere (step S100).

The first atmosphere in step S100 is, for example, a high humidity atmosphere having a temperature of 25 ° C. or higher and a humidity of 50% or higher and a moisture content in the atmosphere of 11.5 g / m ³ . Prior to step S100, the terminal unit 100 may be subjected to a degreasing process in order to make it easy for moisture to adhere to the terminal unit 100.

  Next, as shown in FIG. 4B, the terminal portion 100 to which moisture is attached is disposed in the cavity 210 of the mold 200 except for the contact piece portion 112 of the connection terminal 110 and the vicinity thereof, and the cavity A resin material is injected into 210 to fill the periphery of the terminal unit 100 with the resin material (step S102).

  The resin material injected into the cavity 210 in step S102 is a moisture absorption reaction type urethane hot melt having a property of curing by a hygroscopic reaction, for example, “QR3460” or “QR9515” manufactured by Henkel Japan. Etc. can be used. By this step S102, the surface of the terminal unit 100 on which moisture is attached comes into contact with the resin material.

  Then, the terminal part 100 is released from the mold 200 filled with the resin material in the cavity 210, and the terminal part 100 is left in a second atmosphere at a lower temperature and lower humidity than the first atmosphere for about 24 hours ( Step S104). At this time, an incomplete mold resin 120A is formed on the terminal portion 100 as shown in FIG.

  The incomplete mold resin 120A includes a cured mold resin 120 formed by a resin material in contact with the surface of the terminal portion 100 reacting with moisture, and a resin material outside the mold resin 120 reacting with moisture. And the unreacted portion 121 in a non-reactive state.

The second atmosphere in step S104 is, for example, an atmosphere having a temperature of 20 ° C. or less and a humidity of 30% or less and a moisture content in the atmosphere of 5.2 g / m ³ . This second atmosphere is an atmosphere of lower temperature and lower humidity than the first atmosphere. Moreover, since the moisture content in 2nd atmosphere is 5.2 g / m < ³ > as mentioned above, it is small compared with the moisture content in 1st atmosphere which is 11.5 g / m < ³ >.

  Finally, as shown in FIG. 4D, the terminal portion 100 on which the incomplete mold resin 120A is formed is placed in a third atmosphere at a temperature higher than the second atmosphere, for example, in an atmosphere at a temperature of 80 to 120 ° C. for one hour. By leaving it alone, only the unreacted portion 121 of the unfinished mold resin 120A is melted again, and the excess resin is removed (step S104), so that the mold having a substantially constant thickness along the surface shape of the terminal portion 100 is obtained. Resin 120 is formed around terminal portion 100. Note that it is not practical to form such a mold resin 120 using only a mold because the processing cost of the mold increases.

  Thus, since the terminal part 100 of the covered wire | conductor 1 which concerns on this embodiment is covered and sealed with the mold resin 120 of substantially constant thickness along the surface shape, it is mold resin 120 rather than the conventional terminal part. Therefore, it is possible to reduce the size of the device. In addition, since the mold resin 120 is thin, it can be expected that the curing time of the resin is shortened to improve the productivity.

DESCRIPTION OF SYMBOLS 1 Coated wire 1a Core wire 1b Insulation coating 100 Terminal part 110 Connection terminal 111 Wire crimping part 111a Insulation coating crimping piece 111b Core wire crimping piece 111c Connection part 112 Contact piece part 112a Screw insertion hole 113 Plate-shaped part 120 Mold resin 120A Incomplete mold resin 121 Unreacted part 200 Mold 210 Cavity

Claims (4)

Sheathed wire,
A connection terminal having a crimped portion to be crimped to the end of the covered electric wire;
A method for manufacturing a terminal portion of a covered electric wire having a moisture absorption reaction type mold resin covering an end portion of the covered electric wire and a terminal portion including a crimp portion of the connection terminal,
Leaving the terminal portion in a first atmosphere to attach a predetermined amount of moisture;
A step of bringing a moisture absorption reaction type resin material into contact with the terminal part to which the moisture is attached;
Leaving the terminal portion in contact with the resin material in a second atmosphere at a lower temperature and lower humidity than the first atmosphere for a first predetermined time;
A step of removing the unreacted resin material by allowing the terminal portion left for the first predetermined time to stand in a third atmosphere having a temperature higher than the second atmosphere for a second predetermined time. The manufacturing method of the terminal part of the covered electric wire to perform.   2. The method of manufacturing a terminal portion of a covered electric wire according to claim 1, wherein the amount of moisture contained in the first atmosphere is greater than the amount of moisture contained in the second atmosphere.   The method for manufacturing a terminal portion of a covered electric wire according to claim 1 or 2, further comprising a step of degreasing the terminal portion prior to the step of attaching the moisture. Sheathed wire,
A connection terminal having a crimped portion to be crimped to the end of the covered electric wire;
A terminal portion of the covered electric wire having a moisture absorption reaction type mold resin covering the terminal portion including the end portion of the covered electric wire and the crimp portion of the connection terminal,
The terminal part of the covered electric wire manufactured by removing the unreacted resin material from the hygroscopic reaction type resin material provided in the terminal part.

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