JP6102786B2 - Manufacturing method of electric wire with terminal - Google Patents

Description

  The present invention relates to a terminal-attached electric wire used for a wire harness for automobiles and the like, and particularly relates to a technique for performing anticorrosion treatment on a connection portion between an electric wire and a terminal.

  When using aluminum as the conductor of the electric wire of the wire harness, a material other than aluminum, such as copper, may be used as the material of the terminal for connecting the electric wire and the electric device. Here, when a dissimilar metal such as copper comes into contact with the aluminum conductor, and an electrolytic solution such as salt water adheres to this portion, the dissimilar metal contact corrosion may occur. In order to prevent this, treatment (hereinafter referred to as “corrosion prevention treatment”) is performed to prevent the electrolytic solution from adhering to the connection portion between the conductor and the terminal.

  A technique related to anticorrosion treatment is disclosed in Patent Document 1.

  Patent Document 1 discloses a technique in which a molding material is molded into a molded body having a predetermined shape in a molding die that surrounds the upper, lower, left, and right sides of the electric wire connection portion of the terminal, and the electric wire connection portion is sealed by the molded body. Yes.

JP 2012-79654 A

  However, according to the technique disclosed in Patent Document 1, the wire connection portion becomes thicker by the thickness of the molded body. For this reason, unless the cavity space of the connector that accommodates the terminal is widened, the terminal cannot be accommodated in the cavity of the connector. For this reason, a new connector design and a connector molding die are required, which is a factor in increasing the cost of the wire harness. Therefore, there has been a demand for a technique that can easily suppress the electric wire connecting portion from becoming excessively thick.

  Then, an object of this invention is to provide the technique which suppresses easily that the electric wire with a terminal after anticorrosion processing becomes thick too much.

  In order to solve the above problem, a first aspect is a method for manufacturing a terminal-attached electric wire in which a connection portion between the electric wire and the terminal is subjected to anticorrosion treatment. The manufacturing method of the electric wire with a terminal which concerns on a 1st aspect WHEREIN: While the core wire crimping part of a terminal is crimped | bonded to the exposed core wire part of the edge part of the said electric wire, the covering crimping part of the said terminal is covered with the said electric wire. The step of preparing the terminal connected to the electric wire by being crimped, and (b) from the base end side portion exposed to the coated crimping portion side with respect to the core crimping portion in the exposed core wire portion, Supplying a flow-preventive anticorrosive agent to a region up to a tip end side portion exposed on the opposite side of the coated crimp portion with respect to the core crimp portion in the exposed core portion, and (c) the terminal And leveling the anticorrosive agent supplied to the terminal with the spatula by relatively moving the spatula.

  Moreover, a 2nd aspect is an aspect of the manufacturing method of the electric wire with a terminal which concerns on a 1st aspect. In the method of manufacturing a terminal-attached electric wire according to the second aspect, in the step (c), the spatula is relatively moved from the distal end side portion to the proximal end side portion in the exposed core portion.

  Moreover, a 3rd aspect is an aspect of the manufacturing method of the electric wire with a terminal which concerns on a 2nd aspect. In the method for manufacturing a terminal-attached electric wire according to the third aspect, in the step (c), the spatula is relatively moved to a position reaching the coated crimping portion.

  The fourth aspect is any one of the first to third aspects. In the manufacturing method of the electric wire with terminal according to the fourth aspect, the front surface of the spatula facing forward in the moving direction with respect to the terminal forms a V-shaped surface recessed inward.

  Moreover, a 5th aspect is an aspect of the manufacturing method of the electric wire with a terminal which concerns on a 4th aspect. In the method of manufacturing the electric wire with terminal according to the fifth aspect, the front surface is inclined toward the side opposite to the moving direction from the terminal side toward the spatula side.

  Moreover, a 6th aspect is an aspect of the manufacturing method of the electric wire with a terminal which concerns on a 5th aspect. As for the manufacturing method of the electric wire with a terminal concerning the 6th mode, the lower end portion of the spatula extends along the width direction of the terminal.

  According to the manufacturing method of the electric wire with a terminal concerning the 1st to the 6th modes, the anticorrosive can be leveled at a desired height by adjusting the height position of the spatula with respect to the terminal. Therefore, it can be easily suppressed that the terminal-attached electric wire after the anticorrosion treatment becomes excessively thick due to the anticorrosive coating.

  According to the manufacturing method of the electric wire with a terminal concerning the 2nd mode, it can reduce that a corrosion inhibitor flows into the tip side of a terminal. For this reason, it can reduce that an anticorrosive has a bad influence on the electrical connection performance of a terminal.

  According to the manufacturing method of the electric wire with a terminal concerning the 3rd mode, the surplus anticorrosive agent can be brought near to the peripheral part of the covering crimping part which has a margin which can receive an anticorrosive agent comparatively in a terminal.

  According to the manufacturing method of the electric wire with a terminal concerning the 4th mode, surplus anticorrosive can be collected on the bottom of the V-shaped surface. For this reason, spreading of the anticorrosive agent in the width direction of the terminal can be reduced.

  According to the manufacturing method of the electric wire with a terminal concerning the 5th mode, an excess anticorrosive agent can be made to run on a spatula. For this reason, spreading of the anticorrosive agent in the width direction of the terminal can be reduced.

  According to the method for manufacturing a terminal-attached electric wire according to the sixth aspect, when the spatula is moved up and down with respect to the terminal, the distance between the front surface of the spatula and the terminal becomes large at the V-shaped bottom portion, which corresponds to this. There is a possibility that the anticorrosive agent is highly deposited on the terminal portion. Since such a highly raised portion can be leveled by the lower end portion of the spatula extending along the width direction of the terminal, the anticorrosive can be appropriately spread.

It is a schematic side view which shows the electric wire with a terminal which concerns on embodiment. It is a schematic plan view which shows an electric wire with a terminal same as the above. It is a schematic perspective view which shows a terminal. It is explanatory drawing which shows the manufacturing process of an electric wire with a terminal. It is explanatory drawing which shows the manufacturing process of an electric wire with a terminal. It is explanatory drawing which shows the example of the supply position of the anticorrosive with respect to the electric wire with a terminal. It is explanatory drawing which shows the manufacturing process of an electric wire with a terminal. It is explanatory drawing which shows the modification regarding the supply method of an anticorrosive. It is explanatory drawing which shows the other modification regarding the supply method of an anticorrosive. It is explanatory drawing which shows the other modification regarding the supply method of an anticorrosive. It is explanatory drawing which shows the further another modification regarding the supply method of an anticorrosive. It is explanatory drawing which shows the further another modification regarding the supply method of an anticorrosive. It is explanatory drawing which shows the other modification regarding the manufacturing process of an electric wire with a terminal. It is a schematic front view which shows the spatula which concerns on a modification. It is explanatory drawing which shows the further another modification regarding the manufacturing process of an electric wire with a terminal.

  Hereinafter, the electric wire with a terminal concerning the embodiment and its manufacturing method are explained.

<About electric wires with terminals>
FIG. 1 is a schematic side view showing the terminal-attached electric wire 10, FIG. 2 is a schematic plan view showing the terminal-attached electric wire 10, and FIG. 3 is a schematic perspective view showing the terminal 20.

  The electric wire with terminal 10 includes an electric wire 12, a terminal 20, and an anticorrosion coating 40.

  The electric wire 12 includes a core wire 14 and a coating 18 that covers the core wire 14. The core wire 14 is a linear conductor, and here, the core wire 14 is formed by twisting a plurality of strands. The coating 18 is made of an insulating material such as resin. The coating 18 is formed by, for example, extrusion coating a softened resin around the core wire 14.

  Further, a coating 18 having a predetermined length is peeled off from the core wire 14 at the end of the electric wire 12. Thereby, the exposed core wire part 14a which the core wire 14 exposes over predetermined length is provided in the edge part of the electric wire 12. FIG.

  The terminal 20 is a member formed by, for example, pressing a metal plate material that is a conductive plate material. The contact portion 30 directly contacts a mating terminal 80 as a mating electrical connection element, and the contact portion 30. And an electric wire holding part 22 connected to.

  The electric wire holding portion 22 includes a distal end side connecting portion 23, a core wire crimping portion 24, an intermediate connecting portion 25, and a covering crimping portion 26. The distal end side connecting portion 23, the core wire crimping portion 24, the intermediate connecting portion 25, and the covering crimping portion 26 are formed in a line along the linear direction. In the present embodiment, in the present terminal 20, the contact portion 30 side is described as the distal end side of the terminal 20, and the wire holding portion 22 side is described as the proximal end side of the terminal 20.

  The covering crimping part 26 is a part that is crimped to the end of the covering 18 of the electric wire 12 by being caulked. The covering crimping portion 26 includes a bottom plate portion 26a and a pair of covering crimping pieces 26b and 26b that are erected on both sides of the bottom plate portion 26a and face each other. Here, of the pair of coated crimping pieces 26b, 26b, the edge portion on the distal end side of the terminal 20 is formed in a shape inclined toward the proximal end side of the terminal 20 toward the distal end side in the standing direction of each coated crimped piece 26b. ing.

  The intermediate connecting portion 25 is a portion that connects the coated crimping portion 26 and the core wire crimping portion 24. The intermediate connecting portion 25 includes a bottom plate portion 25a and a pair of side wall portions 25b and 25b that are erected on both sides of the bottom plate portion 25a and face each other.

  The core wire crimping portion 24 is a portion that is crimped to the exposed core wire portion 14a by being caulked. The core wire crimping portion 24 includes a bottom plate portion 24a and a pair of core wire crimping pieces 24b and 24b that are erected on both sides of the bottom plate portion 24a and face each other.

  In the present embodiment, the description will be made assuming that the direction in which the pair of coated crimping pieces 26b and 26b face each other is the width direction. Further, the description will be made assuming that the direction in which the pair of core wire crimping pieces 24b is erected with respect to the bottom plate portion 24a is the height direction.

  The distal end side connecting portion 23 is a portion that connects the core wire crimping portion 24 and the contact portion 30. The distal end side connecting portion 23 includes a bottom plate portion 23a and a pair of side wall portions 23b and 23b that are erected on both sides of the bottom plate portion 23a and face each other.

  Each bottom plate part 23a, 24a, 25a, 26a in the electric wire holding | maintenance part 22 is formed in the shape which continues in plate shape as a whole. Moreover, the side wall part 23b, the core wire crimping piece 24b, the side wall part 25b, and the covering crimping piece 26b on one side in the width direction in the electric wire holding part 22 are formed in a shape that is continuous in a plate shape as a whole. Similarly, the side wall portion 23b, the core wire crimping piece 24b, the side wall portion 25b, and the covering crimping piece 26b on the other side in the width direction of the electric wire holding unit 22 are also formed in a shape that is continuous in a plate shape. Further, the coated crimping pieces 26b and 26b of the coated crimping portion 26 and the core crimping pieces 24b and 24b of the core wire crimping portion 24 that are caulked (bent) portions with respect to the electric wire 12 are the intermediate coupling portion 25 and the distal end side coupling portion. The side wall portions 25b, 25b, 23b, and 23b of 23 are formed longer in the height direction.

  The contact portion 30 is a portion (terminal connection portion) that is in direct contact with the counterpart terminal 80 as the counterpart electrical connection element and connected to the counterpart terminal 80. The contact portion 30 is a cylindrical portion in which a terminal insertion hole 32 that is a hole into which the mating terminal 80 is fitted is formed. In this embodiment, the contact part 30 is formed in a rectangular tube shape, and a contact piece 33 that contacts the mating terminal 80 and elastically deforms is provided inside.

  Here, an example in which the contact portion 30 is formed in a cylindrical terminal shape (so-called female terminal shape) will be described, but the contact portion has a shape including an elongated rod-like or elongated plate-like terminal shape (so-called male terminal shape). It may be formed.

  The terminal 20 is connected to the end of the electric wire 12 as follows. That is, the end portion of the covering 18 is located between the pair of covering crimping pieces 26 b and 26 b in the covering crimping portion 26, and the exposed core wire portion 14 a is located between the pair of core crimping pieces 24 b and 24 b in the core wire crimping portion 24. Are arranged as follows. In this state, the coated crimping pieces 26b, 26b of the coated crimping portion 26 are bent (caulked) toward the coating 18 (inner side) on the bottom plate portion 26a. Furthermore, the core wire crimping pieces 24b, 24b of the core wire crimping portion 24 are bent (caulked) toward the exposed core wire portion 14a side (inner side) on the bottom plate portion 24a. Thereby, in the covering crimping portion 26, the bottom plate portion 26a and the two covering crimping pieces 26b and 26b are held in a state where they are crimped to the end portions of the covering 18, and in the core wire crimping portion 24, the bottom plate portions 24a and 2 The two core wire crimping pieces 24b and 24b are held in a state where they are crimped to the exposed core wire portion 14a.

  Here, the core wire 14 (element wire) of the electric wire 12 and the terminal 20 are made of different metals. For example, the core wire 14 is made of aluminum or an aluminum alloy containing aluminum as a main component. On the other hand, the terminal 20 is made of copper or a copper alloy containing copper as a main component (brass, etc.), or tin (Sn) plating on these members, or silver (Ag), copper (Cu), bismuth on tin. This is a member plated with a tin alloy to which (Bi) or the like is added. Accordingly, the dissimilar metal is in contact with the connecting portion between the core wire 14 and the terminal 20, and when an electrolytic solution such as salt water adheres to this portion, dissimilar metal contact corrosion may occur.

  Moreover, in the connection part of the terminal 20 and the electric wire 12, the exposed core part 14a is exposed outside at the following each part. That is, the base end portion of the exposed core wire portion 14 a is exposed between the core wire crimp portion 24 and the covering crimp portion 26. Further, the tip of the exposed core wire portion 14 a is exposed between the core wire crimping portion 24 and the contact portion 30. Further, since a pair of core wire crimping pieces 24b of the core wire crimping portion 24 is caulked to the exposed core wire portion 14a, a gap may be generated between the tip ends of the pair of core wire crimping pieces 24b, 24b. An intermediate portion of the exposed core portion 14a can be exposed between 24b and 24b.

  Therefore, the anticorrosive agent in a fluid state is applied to the proximal end portion Q1 exposed to the cover crimping portion 26 with respect to the core crimping portion 24 in the exposed core wire portion 14a and the pair of core crimping pieces 24b and 24b of the core crimping portion 24. It supplies with respect to the part Q2 between, and the front end side part Q3 exposed to the opposite side to the covering crimping | compression-bonding part 26 with respect to the core crimping | compression-bonding part 24 among the exposed core wire parts 14a. And the anticorrosive of a fluid state spreads on the surface of those each part Q1, Q2, Q3, forms a film, this film is hardened, and the anticorrosion film 40 is formed. Then, since each of those portions Q1, Q2, and Q3 is covered with the anticorrosion coating 40, even if the electrolytic solution adheres to the connection portion between the terminal 20 and the electric wire 12, the electrolytic solution is not applied to the exposed core portion 14a. Do not touch. For this reason, it will be suppressed that it will be in the state where electrolyte solution adhered to a dissimilar metal, and, therefore, dissimilar metal contact corrosion is controlled. The anticorrosion coating 40 is transparent or translucent, but this is not essential.

  But in order to suppress the enlargement of the connection part of the terminal 20 and the electric wire 12, and to suppress the usage-amount of an anticorrosive, it is preferable to be able to supply a trace amount anticorrosive as widely as possible. Therefore, here, the anticorrosive agent in a fluid state is composed of a base end side portion Q1 exposed to the coated crimping portion 26 with respect to the core crimping portion 24 of the exposed core portion 14a, and a pair of core crimping pieces 24b of the core crimping portion 24. , 24b, and the portion Q2 of the exposed core wire portion 14a that is exposed to the core wire crimping portion 24 on the opposite side of the coated crimping portion 26 from the portion Q2 of the exposed core wire portion 14a. In at least one part, the fluidized anticorrosive is supplied in the form of dots.

  That is, the anticorrosive agent in a fluid state is not continuously supplied, but is intermittently and partially supplied onto each of the parts Q1, Q2, and Q3. The fluidized anticorrosive agent supplied in the form of dots spreads on the surface of the exposed core part 14a according to its own viscosity, wettability of the anticorrosive agent to the exposed core part 14a, and the like. And the anticorrosive agent supplied by dot shape in a different location connects, and forms the continuous film. When the coating is cured, the anticorrosion coating 40 can be formed on portions Q1, Q2, and Q3 exposed from the wire holding portion 22 in the exposed core portion 14a.

  The anticorrosive agent may also spread on the surface of the wire holding portion 22 around the portions Q1, Q2, and Q3 exposed from the wire holding portion 22 in the exposed core portion 14a. But it is preferable that the area | region where an anticorrosive spreads on the surface of the electric wire holding part 22 is as small as possible.

<About manufacturing method of electric wire with terminal>
A method for producing the terminal-attached electric wire 10 will be described.

  4 and 5 are explanatory views showing a manufacturing process of the terminal-attached electric wire 10. As shown in FIG. 4, the terminal-attached electric wire 10 before the anticorrosion treatment in which the electric wire 12 and the terminal 20 are connected is prepared (step (a)). The terminal-attached electric wire 10 corresponds to the terminal 20 connected to the electric wire 12. In the connection portion between the electric wire 12 and the terminal 20, the exposed core wire portion 14 a is exposed at both ends of the core wire crimping portion 24. Further, the exposed core wire portion 14a can be exposed even between the tip portions of the core wire crimping piece 24b of the core wire crimping portion 24.

  After the terminal-attached electric wire 10 before the anticorrosion treatment is prepared, as shown in FIG. 5, the fluidized anticorrosive agent is supplied to the exposed portion of the exposed core wire portion 14a from the electric wire holding portion 22 (step (step ( b)).

  The anticorrosive agent in a fluid state is supplied using an apparatus that can supply the anticorrosive agent in a dot shape. As such an apparatus, a dispenser 90 is preferably used. The dispenser 90 is a device that discharges the liquid stored in the liquid storage portion 92 from the tip of the needle 94 in a pulse shape by sending a gas in a pulse shape toward the liquid storage portion 92. By controlling the pressure and pressurization time of the gas sent in pulses, the supply rate and supply time of the anticorrosive agent at each point-like location where the anticorrosive agent is supplied are controlled, and the supply amount of the anticorrosive agent is thereby controlled. Can be controlled.

  In the step of supplying the fluidized anticorrosive (step (b)), the fluidized anticorrosive is applied to the proximal end portion Q1 of the exposed core portion 14a exposed to the coated crimping portion 26 with respect to the core crimping portion 24. A supplying step (b1), a step S (b2) of supplying a fluidized anticorrosive agent to the portion Q2 between the pair of core wire crimping pieces 24b of the core wire crimping portion 24, and the core crimping portion 24 of the exposed core wire portion 14a. On the other hand, a step (b3) of supplying a fluidized anticorrosive agent to the distal end side portion Q3 exposed on the side opposite to the coated crimping portion 26 is included. Here, in all the steps (b1), (b2), and (b3), the fluidized anticorrosive agent is supplied in the form of dots.

  FIG. 6 is a diagram illustrating an example of a supply point of the anticorrosive agent when supplying the anticorrosive agent in a fluid state to the connection portion between the electric wire 12 and the terminal 20 in a dot shape. In the figure, the anticorrosive agent in a fluid state is supplied in the form of dots at a point P1 between the tip ends of the pair of coated crimping pieces 26b of the coated crimping part 26. Further, with respect to the base end side portion Q1 of the exposed core portion 14a, a supply point P2 from the base end portion (a point on the boundary line between the exposed core portion 14a and the coating 18) and supply points P3 to P7 from the front end portion. Then, the fluidized anticorrosive agent is supplied in the form of dots so as to be scattered in the width direction (step (b1)). In addition, the fluidized anticorrosive agent is supplied to the portion Q2 between the pair of core wire crimping pieces 24b of the core wire crimping portion 24 at a supply point P8 from the base end portion (step (b2)). Further, the anticorrosive agent in a fluid state is supplied to the distal end side portion Q3 of the exposed core portion 14a at points of supply points P9 to P11 so as to be scattered in the width direction (step (b3)). . In addition, here, the anticorrosive agent in a fluid state is supplied to the bottom plate portion 23a of the distal end side connecting portion 23 in the form of dots at the supply points P12 to P14 even at the position on the distal end side from the exposed core portion 14a.

  The needle 94 is supported by a triaxial moving mechanism device 98 or the like so as to be movable in the extending direction, the width direction, and the height direction of the electric wire holding portion 22, and according to the supply points P1 to P14. In accordance with the predetermined position data, it is preferable to move and drive the supply position while being controlled. However, the movement of the needle 94 may be performed manually by an operator.

  The fluidized anticorrosive agent supplied in the form of dots spreads on the surface of the exposed core part 14a according to its own viscosity, wettability of the anticorrosive agent to the exposed core part 14a, and the like. And the anticorrosive of the fluid state supplied in each supply point P1-P14 spreads on the surfaces, such as part Q1, Q2, Q3, and is mutually connected, and forms one continuous film. As already described, the extent of spreading of the anticorrosive agent in the fluid state depends on its own viscosity, wettability of the anticorrosive agent to the exposed core portion 14a, and the like. In any case, the anticorrosive agent supplied at each of the supply points P1 to P14 is spread and connected on the surface of the parts Q1, Q2, Q3, etc., and as a premise, one continuous film is formed at each supply point. The amount of the anticorrosive supplied and the distance between the supply points are appropriately adjusted and set by an experimental or empirical method.

  However, as will be described later, in the present embodiment, a step (step (c)) of leveling the anticorrosive in a fluid state by the spatula 51 is performed. By this leveling step, the fluidized anticorrosive agent supplied to the supply points P1 to P14 can be formed into one continuous film. For this reason, the anticorrosive supplied to the supply points P <b> 1 to P <b> 14 does not necessarily need to form one continuous film before the step of leveling with the spatula 51.

  As already described, the anticorrosive agent in the fluid state supplied as described above is the portion of the wire holding portion 22 around the portions Q1, Q2, Q3 exposed from the wire holding portion 22 in the exposed core wire portion 14a. It may also spread on the surface.

  As described above, the anticorrosive agent in the fluid state is mainly supplied to the portions Q1, Q2, and Q3 in the form of dots, but may be supplied to the other portions in the form of dots. Also here, at the supply points P1 between the respective distal end portions of the pair of coated crimping pieces 26b, 26b of the coated crimping portion 26 and the supply points P12 to P14 at the distal end side from the exposed core portion 14a, the distal end side connecting portion 23 is provided. A fluidized anticorrosive agent is supplied to the bottom plate portion 23a in a dotted manner.

  However, the center region excluding the peripheral portion of the pair of coated crimping pieces 26b and the central region excluding the peripheral portion of the pair of core wire crimping pieces 24b, and the outer surface side of each of the bottom plate portions 23a, 24a, 25a, 26a The anticorrosive agent is preferably not supplied. Moreover, in the range where the exposed core part 14a exists in the extending direction of the electric wire holding part 22, the anticorrosive agent may be supplied in a dot-like manner only to the parts Q1, Q2, and Q3 (including the boundary line). preferable.

  FIG. 7 is an explanatory view showing a manufacturing process of the anticorrosive. As shown in FIG. 7, when the anticorrosive agent L in a fluid state is supplied to the terminal-attached electric wire 10, a step (step (c)) of leveling the anticorrosive agent in a fluid state with a spatula 51 is performed. In this step (c), the flat spatula 51 is moved relative to the terminal-attached electric wire 10. The spatula 51 relatively moves the position of the terminal-attached electric wire 10 to which at least the anticorrosive L is supplied, that is, from the distal end side portion Q3 to the proximal end side portion Q1 in the exposed core portion 14a. The width of the spatula 51 is sufficiently longer than the width of the terminal 20 attached to the electric wire 12 as shown in FIG. Moreover, the lower end of the spatula 51 may not extend linearly along the width direction of the terminal 20, and a portion that is recessed upward or a portion that protrudes downward may be appropriately provided.

  Here, “relatively move” means that when the spatula 51 is moved with respect to the terminal-equipped electric wire 10 at a fixed position, the terminal-equipped electric wire 10 is moved with respect to the spatula 51 at the fixed position. The case where it moves, and the case where the electric wire 10 with a terminal and the spatula 51 are moved are included. In the following description, it is assumed that the spatula 51 is moved with respect to the terminal-attached electric wire 10 at a fixed position.

  The height of the lower end of the spatula 51 when the anticorrosive agent L is moved greatly affects the film thickness of the anticorrosion coating 40 formed on the terminal-attached electric wire 10. For this reason, during the movement of the spatula 51, the lower end of the spatula 51 is preferably a height corresponding to the allowable upper limit value of the film thickness of the anticorrosion coating 40 to be formed on the terminal-attached electric wire 10, or lower than that height. Maintained at height. As an example of the movement of the spatula 51, as indicated by an arrow 61 in FIG. 7, the tip side portion Q <b> 3 to the portion Q <b> 2 are moved at the same height along the longitudinal direction of the terminal-attached electric wire 10. And in the base end side part Q1, it is possible to move the spatula 51 upward according to the inclination of the exposed core part 14a.

  In addition, the anticorrosive L in a fluidized state may spread to the distal end side of the terminal 20 from the distal end side portion Q3 or to the proximal end side of the terminal 20 from the proximal end side portion Q1. For this reason, the spatula 51 may be moved in a range wider than the range from the distal end side portion Q3 to the proximal end side portion Q1. Specifically, in the example shown in FIG. 7, the spatula 51 is moved to a position reaching the covering crimping portion 26 on the base end side of the terminal 20 with respect to the base end side portion Q1. As a result, the anticorrosive agent L of the coated crimping portion 26 can be leveled, and the anticorrosive coating 40 can be formed also on this portion.

  After leveling of the anticorrosive agent is completed, a step (step (d)) of curing the anticorrosive agent in a fluid state is performed in a state where one coating film of the anticorrosive agent is formed (see FIGS. 1 and 2). The In this step (d), processing according to the type of anticorrosive used is carried out. When the anticorrosive has the property of being cured by light such as ultraviolet rays, a step of irradiating the anticorrosive agent with light such as ultraviolet rays is performed. When the anticorrosive agent has a property of being cured by heat, a treatment for heating the anticorrosive agent is performed. In the case where the anticorrosive has the property of being cured by moisture in the air or the like, or the property of being cured by the volatilization of the components in the anticorrosive, etc., the treatment is allowed to stand for the time required for curing.

  Thereby, the said anticorrosion film 40 can be formed in the part Q1, Q2, Q3 exposed from the electric wire holding part 22 among the exposed core part 14a.

  In addition, in process (b), the anticorrosive agent supplied to each part Q1, Q2, Q3 in the shape of a dot may continue spreading over time. In particular, if the fluidized anticorrosive agent supplied to the distal end side portion Q3 of the exposed core portion 14a continues to spread, there is a possibility of reaching the contact portion 30 side, which may affect the connection performance of the contact portion 30 and the like. is there. On the other hand, even if the fluidized anticorrosive agent supplied to the proximal end portion Q1 of the exposed core portion 14a spreads around, it does not easily affect the connection performance of the contact portion 30 or the like. Therefore, after performing the above steps (b1), (b2), and (b3) in this order (see arrow 62 in FIG. 6), it is conceivable to carry out a step of curing the fluidized anticorrosive. As a result, the time for the anticorrosive agent in the fluidized state supplied to the tip end portion Q3 of the exposed core portion 14a to spread to the surroundings before curing can be shortened, and the anticorrosive agent hardly reaches the contact portion 30. Therefore, the reliability of the connection performance of the contact part 30 can be improved.

<Effects>
According to the manufacturing method of the electric wire 10 with a terminal and the electric wire 10 with a terminal configured as described above, the proximal end side portion Q1 of the exposed core wire portion 14a, the portion Q2 between the pair of core wire crimping pieces 24b, and the exposed core wire portion 14a. Since the anticorrosive agent in a fluid state is supplied to the distal end side portion Q3, the exposed portion of the exposed core portion 14a can be covered with the coating film of the anticorrosive agent at the connection portion between the wire 12 and the terminal 20. Thereby, the situation that an electrolyte solution adheres in the state straddling a dissimilar metal is suppressed, and the required anticorrosion performance can be satisfied. Moreover, the usage-amount of an anticorrosive agent can be reduced mainly by supplying the anticorrosive agent of a fluid state to those each part Q1, Q2, Q3. Further, by limiting the formation region of the coating film with the anticorrosive agent, there is also an advantage that the coating film with the anticorrosive agent makes it difficult to contaminate the surroundings (such as in the cavity of the connector).

  Further, the anticorrosion film formed by supplying the anticorrosive agent in a fluid state is clearly thinner than the configuration using a molded body by a molding die, and therefore, the connection portion between the electric wire 12 and the terminal 20. Increase in size can be suppressed.

  In particular, in steps (b1), (b2), and (b3), a fluidized anticorrosive agent is supplied in the form of dots, and a continuous coating is formed by the fluidized anticorrosive agent that is supplied in the form of dots and spreads around it. In addition, since the cured film is used as the anticorrosive film 40, a small amount of anticorrosive agent can be supplied to as wide a range as possible. From this point, the use of the anticorrosive agent is satisfied while satisfying the required anticorrosion performance. The amount can be reduced.

  In this embodiment, in all of the steps (b1), (b2), and (b3), the fluidized anticorrosive agent is supplied in the form of dots, but in at least one step, the fluidized anticorrosive agent is supplied. What is necessary is just to be supplied in dot shape, and in another process, the anticorrosive of a fluid state may be continuously supplied linearly.

  In addition, after the steps (b1), (b2), and (b3) are performed in this order, the anticorrosive agent is cured, so that the anticorrosive agent supplied in the step (b3) is transferred to other terminals of the terminal 20. It becomes difficult to flow into the contact part 30 which is a part provided for the connection. For this reason, it is relatively easy to maintain the electrical connection as the terminal 20.

  Moreover, in this embodiment, the excess anticorrosion processing liquid can be brought near to the electric wire 12 side using the spatula 51. For this reason, it becomes difficult for the anticorrosive of a fluid state to flow in by the contact part 30. FIG. Therefore, it is relatively easy to maintain the electrical connection performance and the like as the terminal 20.

  Moreover, the film thickness of the anticorrosive L can be controlled only by adjusting the height of the spatula 51. For this reason, it can suppress easily that the electric wire 10 with a terminal after the anti-corrosion process in which the anti-corrosion film 40 was formed becomes thick too much.

  Moreover, when manufacturing many many electric wires 10 with a terminal continuously, the crimping | compression-bonding states of the core wire crimping part 24, the covering crimping part 26, etc. of the electric wire 10 with a terminal are easy to generate | occur | produce. Even in this case, the height of the surface of the anticorrosion coating 40 can be made uniform by leveling the anticorrosive L with the spatula 51. Therefore, it is possible to easily suppress the terminal-attached electric wire 10 after the anticorrosion treatment from becoming excessively thick.

  Further, the movement of the spatula 51 makes it easier for the anticorrosive agent to spread in the width direction of the terminal 20. For this reason, even if the area | region which should be covered with the anti-corrosion coating 40 is not covered with the anti-corrosion agent L after a process (b), it can cover appropriately by the equalization process with the spatula 51. FIG.

<About modification>
FIG. 8 is an explanatory view showing a modification for supplying a small amount of the anticorrosive L in a dot shape. In FIG. 8, a portion denoted by reference numeral 110 represents the surface of the portion to be supplied, and a portion denoted by reference numeral 120 represents an anticorrosive discharge needle that discharges the anticorrosive L in a fluid state. In FIG. 8, a plurality of anticorrosive dispensing needles 120 are shown in the left-right direction, and the position of the anticorrosive dispensing needle 120 relative to the surface 110 of the supply target portion and the discharge of the anticorrosive from the left side to the right side. The change in state is shown in chronological order.

  That is, when the anticorrosive agent L in a fluid state discharged from the anticorrosive agent discharge needle 120 is in a very small amount, the anticorrosive agent L is hardly separated from the anticorrosive agent discharge needle 120 depending on its own weight. For this reason, the anticorrosive agent L in a fluid state is discharged from the anticorrosive agent discharge needle 120 and stays at the tip thereof depending on the discharge amount (see (1) in FIG. 8).

  In order to supply the anticorrosive L to the surface 110 of the supply target portion, the anticorrosive discharge needle 120 is placed on the surface 110 of the supply target portion so that the particles of the anticorrosive L are in contact with the surface 110 of the supply target portion. (See (2) in FIG. 8).

  Thereafter, the anticorrosive discharge needle 120 is moved away from the surface 110 of the portion to be supplied (see (3) to (7) in FIG. 8). At this time, the particles of the anticorrosive L that have contacted the surface 110 of the supply target portion are stretched by the anticorrosive discharge needle 120, and eventually the portions remaining on the surface 110 of the supply target portion and the anticorrosive discharge needle 120. It is divided into portions remaining at the tip (see (6) and (7) in FIG. 8). Thereby, even a trace amount of the anticorrosive L can be reliably supplied to the surface of the supply target portion.

  During each of the above operations, the additional anticorrosive L may be discharged from the anticorrosive discharge needle 120.

  FIG. 9 and FIG. 10 are modifications for supplying the anticorrosive agent in the form of dots so that a film having a more uniform thickness can be formed in the steps (b1) and (b3).

  That is, the tip end side portion Q3 of the exposed core portion 14a is basically a collection of a plurality of strands, and has a substantially circular cross section, so that it is high in the center in the width direction and is directed toward both outer sides in the width direction. Shows a shape whose slope gradually increases. For this reason, if the anticorrosive agent is supplied in a dot-like manner in a uniform manner over the entire tip side portion Q3 of the exposed core portion 14a, the film thickness of the anticorrosive agent L may be reduced on both sides in the width direction. This is because the inclination is large on both sides in the width direction of the distal end side portion Q3 of the exposed core portion 14a, and the fluidized anticorrosive L supplied to these portions slides down according to the inclination.

  Then, if it does as follows, an anticorrosive agent can be supplied to dot shape so that the coating film of more uniform thickness can be formed with respect to the front end side part Q3 of the exposed core part 14a.

  That is, as shown in FIG. 9, the anticorrosive L is supplied to the tip part Q3 of the exposed core part 14a with respect to the part which deviates from the center of the width direction in a dot shape.

  Thereafter, as shown in FIG. 10, the anticorrosive discharge needle 120 is moved toward the center in the width direction of the tip end portion Q3 (see arrow 63). In addition, it is preferable to move the anticorrosive discharging needle 120 toward the center in the width direction of the distal end side portion Q3 while rising, so as not to contact the distal end side portion Q3.

  Then, the particles of the anticorrosive L are stretched while being pulled toward the center of the tip end portion Q3 by the anticorrosive discharge needle 120, and eventually remain in the portion remaining on the tip end portion Q3 and the anticorrosive discharge needle 120. Divided into parts. For this reason, it becomes difficult for the anticorrosive L supplied on the front end portion Q3 to slide down outward in the width direction.

  Further, the anticorrosive L remaining in the tip side portion Q3 becomes thinner from the supply point shown in FIG. 9 (located at a position deviated from the center in the width direction of the tip side portion Q3) toward the center in the width direction of the tip side portion Q3. It extends while being distributed (refer to the anticorrosive L indicated by a two-dot chain line in FIG. 10). For this reason, even if it considers that the anticorrosive L which remain | survives in the front end side part Q3 slips slightly to the width direction outer side of the front end side part Q3, more uniform thickness with respect to the front end side part Q3 of the exposed core part 14a. Can be formed.

  In the step (b1), when the fluidized anticorrosive agent is supplied to the base end side portion Q1 in the form of dots, a coating with a more uniform thickness can be formed.

  FIG.11 and FIG.12 is a modification for supplying a trace amount anticorrosive to a wider range in a process (b2).

  That is, since only a slight gap is formed between the pair of core wire crimping pieces 24b, it is preferable that a small amount of anticorrosive agent can be supplied to this part in a longer part.

  Therefore, as shown in FIG. 11, in the step (b2), the anticorrosive agent L is supplied in a dot-like manner to the portion between the pair of core wire crimping pieces 24b of the core wire crimping portion 24, and then the anticorrosive agent discharging needles 120 are paired. It moves along between the core wire crimping pieces 24b (see arrow 64). Then, the particles of the anticorrosive L are stretched while being pulled along the pair of core wire crimping pieces 24b by the anticorrosive discharging needle 120, and the portion remaining in the portion Q2 and the portion remaining in the anticorrosive discharging needle 120 Divided.

  Then, as shown in FIG. 12, the anticorrosive agent L is supplied in a dot shape to a predetermined position between the pair of core wire crimping pieces 24b, and extends from the portion along the moving direction of the anticorrosive agent discharge needle 120 while being elongated. Thus, the anticorrosive L is supplied. Thereby, a trace amount anticorrosive agent can be more reliably supplied with respect to a long part between a pair of core wire crimping pieces 24b.

  In the said embodiment, the process (c) leveled with the spatula 51 is performed after passing the process (b) which supplies the anticorrosive agent of a fluid state to the wire 10 with a terminal to a dot shape. However, in the step (b), it is not always necessary to supply the fluidized anticorrosive agent in the form of dots. That is, the region including the base end side portion Q1, the portion Q2 between the pair of core wire crimping pieces 24b and 24b, and the tip end portion Q3 of the terminal-attached electric wire 10 before the anticorrosion treatment is defined as an anticorrosion target region 40A. The anticorrosion film 40 may be formed on 40A (see FIG. 6). For this reason, the anticorrosive of a fluid state should just be supplied to at least one part of this anticorrosion object area | region 40A. In addition, it can be in the state where the anticorrosive agent was higher than necessary by reducing the supply points of the anticorrosive agent. However, in the step (c), an excessively piled portion can be eliminated by leveling with the spatula 51. For this reason, it can suppress that the film thickness of the anti-corrosion coating 40 in the electric wire 10 with a terminal exceeds an allowable upper limit.

  FIG. 13 is an explanatory view showing another modification example relating to the manufacturing process of the electric wire with terminal. In the above embodiment, in the step (c), the spatula 51 is moved in a state where it stands upright with respect to the extending direction of the terminal-attached electric wire 10. However, as shown in FIG. 13, the spatula 51 may be moved in an inclined state.

  More specifically, as shown in FIG. 13, the front surface 51 </ b> S facing forward in the moving direction of the spatula 51 is inclined rearward in the moving direction (that is, the front end side of the terminal 20) from the terminal 20 side toward the spatula 51 side. doing. The spatula 51 is moved along the terminal-attached electric wire 10 while maintaining this posture. Thereby, the surplus anticorrosive L can be run on the spatula 51 and collected. Therefore, it can suppress more effectively that the film thickness of the anticorrosion coating 40 after hardening exceeds a predetermined allowable upper limit.

  FIG. 14 is a schematic perspective view of a spatula 51A according to a modification. The spatula 51A has a shape in which a groove 53 having a V-shaped cross section is formed in a rectangular parallelepiped. More specifically, in the step (c), the front surface 51AS facing the moving direction (indicated by the arrow 65) in which the spatula 51A moves is recessed uniformly toward the central portion thereof, so that the V-shaped groove 53 is formed. Is formed.

  In the step (c) shown in FIG. 7, by using the spatula 51 </ b> A instead of the spatula 51, the excess anticorrosive L is brought to the bottom of the V-shaped groove 53 (that is, the central portion of the front surface 51 </ b> AS). Can do. Therefore, it can suppress that the anticorrosive L spreads more than necessary outside the width direction.

  In addition, as shown in FIG. 7, since the bottom part (width direction center part) in the V-shaped groove | channel 53 is dented in the base end side part Q1 of the electric wire 10 with a terminal to which the spatula 51A moves up, this part And the gap between the electric wire with terminal 10 becomes larger than the gap between the other portion and the electric wire with terminal 10. For this reason, in the base end side part Q1, the surplus anticorrosive agent L tends to accumulate on the bottom of the V-shaped groove 53 (the center in the width direction of the spatula 51A). The accumulation of the anticorrosive L depends on the opening angle α of the bottom surface of the V-shaped groove 53, the viscosity of the anticorrosive L, and the like. For this reason, the opening angle α is preferably set appropriately according to the surplus amount of the anticorrosive L and the viscosity of the anticorrosive L.

  As with the spatula 51 shown in FIG. 13, it is also effective to move the spatula 51A at an angle. FIG. 15 is an explanatory view showing still another modification example relating to the manufacturing process of the terminal-attached electric wire 10. FIG. 15 is a front view showing the upper surface of the terminal 20 and a part of the lower end side of the inclined spatula 51A as viewed from the front side in the moving direction of the spatula 51A. As shown in FIG. 15, the lower end portion 55 of the inclined spatula 51 </ b> A extends linearly along the width direction of the terminal 20. The lower end portion 55 is a lower end portion of the rear surface facing away from the moving direction of the spatula 51A or an edge portion on the opposite side of the moving direction of the lower surface of the spatula 51A.

  Even when the spatula 51A is tilted and moved, the surplus anticorrosive L corresponds to the bottom of the V-shaped groove 53 in the proximal end portion Q1 of the terminal-attached electric wire 10 where the spatula 51A moves upward. There is a risk of being collected in the width direction. When the viscosity of the anticorrosive L is high, the anticorrosive L is raised. However, in the case of the spatula 51 </ b> A, the raised anticorrosive L can be leveled by the lower end portion 55 that extends linearly along the width direction of the terminal 20. For this reason, the anticorrosive L can be spread suitably.

  As described above, the present invention has been described in detail. However, the above description is illustrative in all aspects, and the present invention is not limited thereto. It is understood that countless variations that are not illustrated can be envisaged without departing from the scope of the present invention.

  Moreover, the content demonstrated by the said embodiment and each modification can be suitably combined unless it mutually contradicts.

DESCRIPTION OF SYMBOLS 10 Electric wire with terminal 12 Electric wire 14 Core wire 14a Exposed core wire part 18 Covering 20 Terminal 22 Electric wire holding part 24 Core wire crimping part 24b Core wire crimping piece 26 Covering crimping part 26b Covering crimping piece 40 Anticorrosion coating 51, 51A Spatula 51S, 51AS Front 53 V Shaped groove 55 Lower end portion L Anticorrosive agent P1-P14 Supply point Q1 Base end side portion of exposed core wire portion Q2 Portion between a pair of core wire crimping pieces Q3 Front end side portion of exposed core wire portion

Claims (6)

A method of manufacturing a terminal-attached electric wire in which anticorrosion treatment is applied to the connection portion between the electric wire and the terminal,
(a) The core crimping part of the terminal is crimped to the exposed core part of the end of the electric wire, and the terminal crimping part of the terminal is crimped to the sheath of the electric wire, thereby being connected to the electric wire. Preparing a terminal;
(b) From the base end side portion exposed to the coated crimped portion side with respect to the core crimped portion in the exposed core portion, the side opposite to the coated crimped portion with respect to the core crimped portion in the exposed core portion Supplying a fluidized anticorrosive agent to the region up to the tip side portion exposed to,
(c) leveling the anticorrosive supplied to the terminal with the spatula by moving the spatula relative to the terminal;
The manufacturing method of the electric wire with a terminal containing. It is a manufacturing method of the electric wire with a terminal according to claim 1,
In the step (c), the spatula is relatively moved from the distal end side portion toward the proximal end side portion in the exposed core wire portion. It is a manufacturing method of the electric wire with a terminal according to claim 2,
In the step (c), the spatula is relatively moved to a position reaching the coated crimping portion. In the manufacturing method of the electric wire with a terminal given in any 1 paragraph of Claims 1-3,
The manufacturing method of the electric wire with a terminal in which the front surface which faces the front of the movement direction with respect to the said terminal in the said spatula forms the V-shaped surface dented inside. In the manufacturing method of the electric wire with a terminal according to claim 4,
The manufacturing method of the electric wire with a terminal in which the said front surface inclines in the opposite side to the said moving direction toward the said spatula side from the said terminal side. In the manufacturing method of the electric wire with a terminal according to claim 5,
The manufacturing method of the electric wire with a terminal with which the lower end part in the said spatula is extended along the width direction of the said terminal.

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