JP6928435B2 - Manufacturing method of electric wire with terminal - Google Patents

Description

The present invention relates to, for example, a method for manufacturing an electric wire with a terminal used in an automobile or the like.

Conventionally, in the fields of automobiles, OA equipment, home appliances, etc., electric wires made of copper-based materials having excellent electrical conductivity have been used as power lines and signal lines. In particular, in the field of automobiles, the performance and functionality of vehicles are rapidly increasing, and the number of various electric devices and control devices mounted on vehicles is increasing. Therefore, along with this, the number of electric wires with terminals used tends to increase.

On the other hand, as environmental problems are attracting attention, weight reduction of automobiles is required. Therefore, an increase in weight due to an increase in the amount of wire harness used becomes a problem. For this reason, lightweight aluminum electric wires are attracting attention in place of the conventionally used copper wires.

Here, a connection terminal is used when connecting such electric wires or at a connection portion of equipment or the like. However, even in the case of an electric wire with a terminal using an aluminum electric wire, copper having excellent electrical characteristics may be used for the terminal portion for the sake of reliability of the connecting portion and the like. In such a case, the aluminum electric wire and the copper terminal are joined and used.

However, when dissimilar metals are brought into contact with each other, so-called galvanic corrosion may occur due to the difference in standard electrode potential. In particular, since the standard electrode potential difference between aluminum and copper is large, corrosion on the electrically base aluminum side progresses due to the influence of water scattering and dew condensation on the contact portion. For this reason, the connection state between the electric wire and the terminal at the connection part becomes unstable, and there is a risk that the electrical resistance increases due to the increase in contact resistance and the decrease in wire diameter, and further, the disconnection occurs, resulting in malfunction or malfunction of the electrical component. be.

Therefore, a method of coating the connection portion between the coated conductor and the terminal with a resin member has been proposed (for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2015-153721

In the conventional method, after crimping the terminal and the coated conducting wire, a resin member is applied to the outer periphery of the connecting portion, and the contact portions with each other are covered with the resin member. However, it is difficult to apply the resin member to the minute gap between the coated conductor and the terminal. In particular, in the vicinity of the tip of the coated conductor, the coated portion is removed and the internal conductor is exposed, but at the boundary between the end of the coated conductor and the exposed conductor, a minute gap is likely to occur due to a change in the outer diameter. Therefore, water may infiltrate into the crimping portion through the gap between the covering portion and the covering crimping portion.

The present invention has been made in view of such a problem, and an object of the present invention is to provide a method for manufacturing an electric wire with a terminal capable of suppressing water from entering the inside of a crimping portion.

In order to achieve the above-mentioned object, the first invention is a method for manufacturing an electric wire with a terminal in which a coated conductor and a terminal are connected. The crimping portion has a coated crimping portion for crimping the coated portion of the coated conductor and a conductor crimping portion for crimping a conductor exposed from the coated portion. A first crimping step of crimping, a resin coating step of applying a tree resin member from the covering portion in the coating crimping portion to the exposed portion of the conductor on the tip side of the conductor crimping portion, the coating crimping portion, and the resin. A method for manufacturing a wire with a terminal, which comprises, in this order, a second crimping step of main crimping the coated portion coated with a member.

A resin curing step of curing the resin member may be provided before the second crimping step.

It is desirable that the hardness of the resin member after curing is lower than the hardness of the coating portion.

After the second crimping step, a resin curing step of curing the resin member may be provided.

The viscosity of the resin member before curing may be 10 to 1000 mPa · s.

After the second crimping step, a step of further applying the resin member may be provided.

Prior to the resin coating step, a temporary crimping step of temporarily crimping the covering crimping portion and the covering portion may be provided.

According to the first invention, since the resin member is applied to the covering portion in the covering crimping portion before crimping, a sufficient gap is provided between the covering portion and the covering crimping portion when the resin member is applied. Can be secured. Therefore, the resin member can be reliably permeated into the gap between the conductor and the terminal around the boundary between the end of the covering portion and the exposed portion of the conductor. Further, it can be applied between the coating portion and the coating crimping portion. Further, at this time, by crimping the conductor crimping portion before applying the resin member, it is possible to suppress the occurrence of mutual conduction failure due to the resin member being applied between the conductor and the conductor crimping portion. can.

Further, by curing the resin member before the second crimping step, it is possible to prevent the resin member from scattering during coating crimping. Further, when the resin member is cured, a sufficient gap can be secured between the coating portion and the coating crimping portion, so that ultraviolet rays can be irradiated deeper when, for example, ultraviolet irradiation is performed. ..

Further, at this time, if the hardness of the cured resin member is lower than the hardness of the coating portion, the resin member is easily deformed at the time of crimping the coating portion, and the gap between the coating portion and the coating crimping portion is surely filled. be able to.

Further, by curing the resin member after the second crimping step, the resin member easily flows during crimping, and the gap between the covering portion and the covering crimping portion can be reliably filled.

Further, when the viscosity of the resin member is 10 mPa · s or more, it is possible to prevent the resin member from flowing down when the resin member is applied and to secure the coating thickness of the resin member. Further, when the viscosity of the resin member is 1000 mPa · s or less, the resin member can be efficiently permeated into the gap.

Further, by further applying the resin member after the second crimping step, the resin member can be coated even in the gap generated during the coating crimping.

Further, by temporarily crimping the coated crimping portion and the covering portion before the resin coating step, the resin member can be coated in a state where the shape of the coated crimping portion is adjusted to some extent. Therefore, it is possible to suppress the outflow of the resin member.

According to the present invention, it is possible to provide a method for manufacturing an electric wire with a terminal, which can prevent water from entering the crimping portion.

The perspective view which shows the electric wire 10 with a terminal. The perspective view which shows the state before crimping of the electric wire 10 with a terminal. The cross-sectional view which shows the state before crimping of the electric wire 10 with a terminal. FIG. 5 is a cross-sectional view showing a state in which the conductor crimping portion 7 is crimped. The figure which shows the state which applied the resin member 17. FIG. 5 is a cross-sectional view showing a state in which the covering crimping portion 9 is crimped. (A) is a sectional view taken along line AA of FIG. 4, (b) is a sectional view taken along line BB of FIG. 5, and (c) is a sectional view taken along line CC of FIG. (A) is an enlargement of the D part of FIG. 4, (b) is an enlargement of the E part of FIG. 5, and (c) is an enlargement of the F part of FIG. The figure which shows the state which further applied the resin member 17a. The figure which shows the state which the conductor crimping part 7 was main crimped, and the covering crimping part 9 was temporarily crimped. The figure which shows the state which applied the resin member 17. The figure which shows the evaluation method of the electric wire 10 with a terminal.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing an electric wire 10 with a terminal. The figure is a perspective view of the resin member 17. The terminal-attached electric wire 10 is composed of a terminal 1, a coated conductor wire 11, and the like. The terminal 1 is an open barrel type, and a copper alloy such as copper or brass or one plated with tin or the like is used. The electric wire 10 with a terminal is configured by connecting the terminal 1 and the coated conductor wire 11. The coated conductor 11 includes a conductor 13 which is an aluminum wire or an aluminum alloy wire, and a covering portion 15 which covers the conductor 13. That is, the coated conductor 11 includes a coated portion 15 and a conductor 13 exposed from the tip thereof.

The terminal 1 includes a terminal body 3 and a crimping portion 5. The terminal body 3 is formed by forming a plate-shaped material having a predetermined shape into a tubular body having a rectangular cross section. The terminal body 3 has an elastic contact piece formed by folding a plate-shaped material into a rectangular cylinder. The terminal body 3 is connected by inserting a male terminal or the like from the front end portion. In the following description, an example is shown in which the terminal body 3 is a female terminal that allows insertion of an insertion tab (not shown) such as a male terminal. In the present invention, the detailed shape of the terminal body 3 is shown. Is not particularly limited. For example, instead of the female terminal body 3, for example, a male terminal insertion tab may be provided.

The crimping portion 5 is a portion to be crimped to the coated conducting wire 11, and has a barrel shape having a substantially U-shaped cross section perpendicular to the longitudinal direction of the terminal 1 before crimping. The crimping portion 5 of the terminal 1 includes a lead wire crimping portion 7 that crimps a conductor exposed from the covering portion to the tip end side of the coated conducting wire, and a covering crimping portion 9 that crimps the covering portion 15 of the coated conducting wire 11.

A part of the inner surface of the conductor crimping portion 7 is provided with serrations (not shown) in the width direction (direction perpendicular to the longitudinal direction). By forming the serrations in this way, when the conductor is crimped, the oxide film on the surface of the conductor is easily broken, and the contact area with the conductor can be increased.

At the tip of the coated conductor 11, the coated portion 15 is peeled off, and the internal conductor 13 is exposed. The coated portion of the coated conductor 11 is crimped by the coated crimping portion 9 of the terminal 1. Further, the conductor 13 whose covering portion 15 is peeled off and exposed is crimped by the conductor crimping portion 7. At the conductor crimping portion 7, the conductor 13 and the terminal 1 are electrically connected. The end face of the covering portion 15 is located between the covering crimping portion 9 and the conductor crimping portion 7.

In the present invention, at least the conducting wire 13 exposed from the covering portion 15 and the terminal 1 is covered with the resin member 17. In the present embodiment, the conductor crimping portion 7 and the coated crimping portion 9 are covered with the resin member 17, and at least the conductor 13 is not exposed to the outside by the resin member 17. That is, the resin member 17 is applied from the covering portion 15 in the coating crimping portion 9 to the exposed portion of the conducting wire 13 on the tip side of the conducting wire crimping portion 7, and is covered by the resin member 17. The resin member 17 is, for example, an ultraviolet curable resin such as silicone acrylate, urethane acrylate, or acrylic acrylate. The details of the resin member 17 will be described later.

Next, a method of manufacturing the electric wire 10 with terminals will be described. FIG. 2 is a perspective view showing a state in which the coated conductor 11 is arranged with respect to the terminal 1, and FIG. 3 is a cross-sectional view of the electric wire 10 with a terminal (coated conductor 11) in the longitudinal direction. First, the covering portion 15 having a predetermined length at the tip of the coated conducting wire 11 is removed to expose the conducting wire 13. Next, the coated conductor 11 is arranged in the crimping portion 5. At this time, the exposed portion of the conductor 13 is located in the conductor crimping portion 7, and the covering portion 15 is located in the covering crimping portion 9.

Next, as shown in FIG. 4, the conductor crimping portion 7 and the conductor 13 are main crimped (first crimping step). That is, in this state, only the conductor crimping portion 7 is main crimped, and the covering crimping portion 9 is not crimped.

Next, as shown in FIG. 5, the resin member 17 is applied from the covering portion 15 in the coating crimping portion 9 to the exposed portion of the conducting wire 13 on the tip side of the conducting wire crimping portion 7 (resin coating step). That is, in this state, the exposed conductor 13 is completely covered with the resin member 17.

The coating thickness of the resin member 17 on the surface of the conductor 13 in the conductor crimping portion 7 is preferably 20 μm or more. If the coating thickness of the resin member 17 is not sufficient, the corrosion resistance is deteriorated.

Next, as shown in FIG. 6, the covering crimping portion 9 and the covering portion 15 coated with the resin member 17 are main crimped (second crimping step). That is, in this state, the covering crimping portion 9 actually crimps the covering portion 15 together with the resin member 17.

7 (a) is a sectional view taken along line AA of FIG. 4, FIG. 7 (b) is a sectional view taken along line BB of FIG. 5, and FIG. 7 (c) is a sectional view taken along line CC of FIG. Is. 8 (a) is an enlarged view of the D portion of FIG. 4, FIG. 8 (b) is an enlarged view of the E portion of FIG. 5, and FIG. 8 (c) is an enlarged view of the F portion of FIG. As described above, at the time of the main crimping of the conductor crimping portion 7, the covering crimping portion 9 is not crimped. Therefore, as shown in FIG. 7A, the covering crimping portion 9 opens upward, and a sufficient gap is formed between the covering portion 15 and the covering crimping portion 9. In particular, as shown in FIG. 8A, at the end of the covering portion 15 (the gap between the conducting wire 13 and the terminal (crimping portion 5) around the boundary between the end of the covering portion 15 and the exposed conducting wire portion). Is formed with a sufficient gap and opens at the top.

Therefore, as shown in FIGS. 7 (b) and 8 (b), the resin member 17 can be easily applied from above the coated crimping portion 9, and the resin member 17 is applied to the covering portion 15 and the covering crimping portion 9. It can penetrate into the gap (particularly, the gap between the conductor 13 and the terminal (crimping portion 5) around the boundary between the end of the covering portion 15 and the exposed portion of the conductor).

In the present embodiment, the viscosity of the resin member 17 at the time of coating (before curing) by JIS Z 8803 is 10 to 2000 mPa · s (more preferably, the viscosity of the resin member 17 is 10 to 1000 mPa · s). Is desirable. If the viscosity is less than 10 mPa · s, when the resin member 17 is applied, the resin member 17 may flow out from the vicinity of the crimping portion and may not be properly coated. If the viscosity exceeds 1000 mPa · s, when the resin member 17 is applied, the resin member 17 may not sufficiently penetrate into the crimping portion, and a gap may be formed inside. In particular, the viscosity exceeds 2000 mPa · s. Then, it becomes difficult to penetrate the resin member 17 into the lower part of the covering portion 15.

By crimping the coated crimping portion 9 with the resin member 17 coated in this way, as shown in FIGS. 7 (c) and 8 (c), after crimping, the coated portion 15 and the coated crimping portion are crimped. The portion where the gap with 9 is narrowed, particularly the gap between the conductor 13 and the terminal (crimping portion 5) around the boundary between the end of the covering portion 15 and the exposed portion of the conductor is also surely filled with the resin member 17. Can be done.

The resin member 17 is, for example, an ultraviolet curable resin. In this case, the resin member 17 may be cured (resin curing step) before the coating crimping portion 9 is crimped (second crimping step), and the resin may be cured after the covering crimping portion 9 is crimped (second crimping step). The member 17 may be cured (resin curing step).

If the resin member 17 is cured before the coating crimping portion 9 is crimped, the upper part of the coating crimping portion 9 is open as shown in FIG. 7B, and the gap between the coating portion 15 and the coating crimping portion 9 is open. Because it is also large, it is possible to irradiate ultraviolet rays deeper. Further, when the covering crimping portion 9 is crimped, the resin member 17 is unlikely to scatter.

In this case, it is desirable that the hardness of the cured resin member 17 is lower than the hardness of the covering portion 15. For example, when a sheet having a thickness of 2 mm is prepared from the cured resin member 17 and the resin of the coating portion 15 and the hardness is measured by JIS K6253-3, the durometer hardness of the coating portion is A50 to A100. The durometer hardness of the cured resin member 17 is in the range of A20 to A50.

As described above, when the hardness of the resin member 17 is low, the resin member 17 is easily deformed when the covering portion 15 is crimped, and the gap between the covering portion 15 and the covering crimping portion 9 can be reliably filled.

On the other hand, if the resin member 17 is cured after the coating crimping portion 9 is crimped, the fluidity of the resin member 17 can be ensured when the coating crimping portion 9 is crimped.

Here, as described above, the resin member 17 is, for example, an ultraviolet curable resin. In this case, when the electric wire 10 with a terminal coated with the resin member 17 is irradiated with ultraviolet rays from above, the shadow of the conducting wire 13 is generated. That is, there is a possibility that the ultraviolet rays may not sufficiently irradiate the resin member 17 below the conducting wire 13. However, the ultraviolet rays emitted from above pass through the resin member 17 and are reflected on the surface of the conducting wire 13 and the inner surface of the terminal 1. Therefore, the ultraviolet rays wrap around the shadowed portion of the conducting wire 13, and the resin member 17 can be cured.

Therefore, the resin member 17 can be irradiated with ultraviolet rays to a deeper depth as long as it is a resin that easily transmits ultraviolet rays. Therefore, in the present invention, it is desirable that the spectral transmittance of the resin member 17 at a wavelength of 365 nm at a thickness of 0.2 mm is 60% or more.

Here, when the spectral transmittance at a thickness of 0.2 mm is 60% or more, a sheet having a thickness of 0.2 mm is formed of the resin constituting the resin member 17, and light incident from one side of the sheet (for example, light). The irradiation amount of 3000 mJ / cm) is the transmittance of light transmitted to the other side. _{Specifically, the light intensity I 0} is measured by a spectrophotometer at a predetermined distance by irradiating with ultraviolet rays. Next, the sheet is placed between the light source and the spectrophotometer, and the light intensity I is measured in the same manner. At this time, I / I ₀ is the spectral transmittance at a thickness of 0.2 mm.

The logarithm of the transmittance and the sheet thickness are in a proportional relationship. Specifically, where t is the sheet thickness and T is the transmittance, t = −Dp × log ₁₀ T. Here, Dp is the curing depth, and is expressed as the slope of the graph of the decrease in transmittance (logarithm) with the increase in sheet thickness. Therefore, when the evaluation is performed using a sheet having a thickness other than 0.2 mm, the range of transmittance according to the thickness of the sheet may be calculated by the above formula.

The transmittance can be adjusted by the amount of the photoinitiator added. Here, if the transmittance is too high, it becomes difficult to visually recognize the resin member 17, and it becomes difficult to visually confirm the quality. Therefore, it is desirable that the transmittance is 90% or less.

Even if the transmittance of the resin member 17 is improved, if the gap between the conductor 13 and the terminal 1 becomes too narrow, the number of reflections increases. It becomes difficult to wrap around sufficiently. Therefore, it is desirable to appropriately set the gap between the conductor 13 and the terminal 1.

For example, when the resin member 17 is cured after the coating crimping portion 9 is crimped, the gap between the conducting wire 13 and the terminal 1 is the distance between the end face of the covering portion 15 and the conducting wire crimping portion 7, and the end face of the covering portion 15. It is formed by the distance between the conducting wire 13 and the terminal 1 in. In this case, it is desirable that the distance between the end face of the covering portion 15 and the conducting wire crimping portion 7 in the longitudinal cross section of the electric wire 10 with a terminal is 0.1 mm or more, and the conducting wire 13 and the terminal 1 on the end face of the covering portion 15 It is desirable that the distance between the two is 0.1 mm or more. By doing so, the light easily wraps around the gap, and the resin member 17 in the shadow portion of the conducting wire 13 can be cured. The distance between the conducting wire 13 and the terminal 1 on the end surface of the covering portion 15 can be roughly rephrased as the thickness of the covering portion 15.

The resin member 17 may be a hybrid curing type that combines not only ultraviolet curing but also ultraviolet curing, moisture curing, anaerobic curing, thermosetting, and the like. By doing so, it is possible to easily cure a portion that is difficult to irradiate with ultraviolet rays.

Further, when a sheet having a thickness of 200 μm of the cured resin member 17 is prepared and the breaking elongation at 25 ° C. is measured by JIS K7113, the breaking elongation of the resin member 17 is preferably 100% or more. As described above, when the breaking elongation of the resin member 17 is 100% or more, the resin member 17 can be easily made to follow the expansion and deformation due to the temperature change and the external force after crimping.

Further, it is desirable that the tensile shear adhesive strength of the resin member 17 according to JIS K6850 is 1 MPa or more. More specifically, according to the tensile shear adhesive strength test method of the adhesive, the tensile shear adhesive strength when the tin-plated copper plate and the acrylic plate are overlapped and bonded by the resin member 17, and the aluminum plate and the acrylic plate are overlapped. For each of the tensile shear adhesion strength when the resin member 17 is bonded and the tensile shear adhesion strength when the soft PVC plate and the acrylic plate are overlapped and bonded by the resin member 17, tensile shear adhesion is applied. The strength is preferably 1 MPa or more. By doing so, it is possible to prevent the resin member 17 from peeling off from the conductor crimping portion 7 and the covering portion 15 to form a gap.

Further, after crimping the coating crimping portion 9, the resin member 17a may be further applied as shown in FIG. By doing so, the resin member 17a can cover the gaps and the like generated during crimping of the covering crimping portion 9. In this case, the resin member 17 and the resin member 17a may be the same resin, but may be different resins. For example, a resin member 17 having a high permeability and a relatively low viscosity can be applied, and a resin member 17a having a relatively high viscosity can be applied in order to secure a coating thickness.

Further, in the present embodiment, as shown in FIG. 10, the coated crimping portion 9 may be temporarily crimped (temporarily crimping step) at the time of the main crimping of the conductor crimping portion 7. That is, the coating crimping portion 9 and the covering portion 15 may be temporarily crimped before the resin coating step. In the temporary crimping, the covering crimping portion 9 is not completely crimped to the covering portion 15, and the shape of the covering crimping portion 9 can be adjusted to a shape close to a circle while maintaining a sufficient gap. As a result, it is possible to prevent the electric wire in the coated crimping portion 9 from being lifted by a predetermined amount or more from the bottom surface of the terminal during the main crimping of the conducting wire crimping portion 7, and the resin member 17a cannot be properly coated in the subsequent resin coating step. ..

From this state, as shown in FIG. 11, by applying the resin member 17, the resin member 17 can be efficiently permeated into the gap between the coating portion 15 and the coating crimping portion 9. Therefore, by crimping the covering crimping portion 9 after this, the gap between the covering portion 15 and the covering crimping portion 9 can be surely filled with the resin member 17.

An ultraviolet curable resin composition having a curing mechanism of ultraviolet curing and moisture curing containing urethane acrylic oligomer, acrylic monomer, and a light initiator as main components was prepared and applied to an electric wire with a terminal under various conditions. At this time, the oligomer component and the monomer component of the present composition were adjusted to prepare resin members having different viscosities, and an anticorrosion test was carried out.

As shown in FIG. 12, the anticorrosion performance was evaluated by storing the salt water 33 in the water tank 31, immersing the electric wire 10 with a terminal (terminal 1), and then measuring the resistance fluctuation between the terminal and the electric wire. The concentration of salt water 33 was determined to be NaCl 3.0 ± 0.5%. The immersion depth of the terminal 1 was set to 300 ± 10 mm. The submersion time was 24 hours, and the resistance was measured after being left in an environment of 95 ± 5% RH for 48 hours at 60 ± 5 ° C. after submersion, and compared with the resistance before immersion in salt water. The electric wire used was 0.75 sq size.

Table 1 shows the results of applying the resin member before crimping the coating by changing the viscosity of the resin member. In addition, each of the following examples was evaluated with n = 10, and as for "corrosion-proof pass / fail" in the table, all resistance fluctuations of n = 10 were 1.0 mΩ or less. ⊚ ”and those with 2.0 mΩ or less were marked with“ ○ ”. Further, when a part of the resistance fluctuation of n = 10 exceeded 2.0 mΩ, it was designated as “Δ”, and when all the resistance fluctuations of n = 10 exceeded 2.0 mΩ, it was designated as “x”. The viscosity of each resin member is the viscosity at the time of coating.

When the resin member is applied before the coating crimping, good results are obtained when the viscosity of the resin member is in the range of 10 mPa · s to 2000 mPa · s, and particularly when the viscosity of the resin member is in the range of 10 mPa · s to 1000 mPa · s. Was a particularly good result. When the viscosity was 3000 mPa · s, the resin member did not sufficiently penetrate into the gap, and the corrosion resistance was inferior.

On the other hand, Table 2 shows the results of applying the resin member after coating and crimping by changing the viscosity of the resin member. Each evaluation method is the same as in Table 1.

When the resin member was applied after the coating was crimped, the corrosion resistance was poor regardless of the viscosity of the resin member.

When the evaluation was performed on the conductors having other diameters (0.5 sq to 2.5 sq), the same result was obtained.

As described above, according to the present embodiment, since the resin member 17 covers the connection portion between the terminal 1 and the coated conductor wire 11, the anticorrosion effect can be efficiently obtained. At this time, since the resin member 17 is applied before the coating crimping, a narrow gap between the coating portion 15 and the coating crimping portion 9 after the coating crimping (particularly, the conductor wire around the boundary between the end portion of the coating portion 15 and the exposed wire portion). The resin member 17 can be reliably applied to the gap between the 13 and the terminal (crimping portion 5). Therefore, it is possible to prevent water from entering from the boundary portion between the end portion of the covering portion 15 and the exposed conductor wire portion along the gap between the covering portion 15 and the coating crimping portion 9. Therefore, in at least a part of the covering crimping portion 9 in the longitudinal direction, a resin member 17 is coated between the covering portion 15 and the covering crimping portion 9 over the entire circumference to obtain an electric wire with a terminal having high corrosion resistance. Can be done.

Further, by curing the resin member 17 before the coating pressure bonding, it is possible to irradiate a deeper portion with ultraviolet rays, and the resin member 17 can be cured more reliably. In addition, it is possible to prevent the resin member 17 from scattering during coating crimping.

Further, at this time, if the hardness of the resin member 17 after curing is lower than the hardness of the coating portion 15, the resin member 17 is easily deformed at the time of coating crimping, and follows the deformation of the coating crimping portion 9 and the coating portion 15. Can fill the gap.

Further, the resin member 17 can be cured after the coating is pressure-bonded. In this case, since the fluidity of the resin member 17 at the time of coating crimping is good, the resin member 17 can be reliably applied even to a narrow gap.

Further, by temporarily crimping the coated crimping portion before applying the resin member 17 to adjust the shape, it is possible to prevent the resin member 17 from flowing down.

Further, by further applying the resin member 17a after the coating crimping, the gap between the coating portion 15 and the coating crimping portion 9 can be more reliably filled.

Although the embodiment of the present invention has been described above with reference to the attached drawings, the technical scope of the present invention does not depend on the above-described embodiment. It is clear that a person skilled in the art can come up with various modifications or modifications within the scope of the technical idea described in the claims, and these are naturally included in the technical scope of the present invention. It is understood that it belongs.

1 ………… Terminal 3 ………… Terminal body 5 ………… Crimping part 7 ………… Conductor crimping part 9 ………… Covered crimping part 10 ………… Wire with terminal 11 ………… Covered conductor 13 ………… Conductor 15 ……… Covering parts 17, 17a ……… Resin member 31 ……… Water tank 33 ……… Salt water

Claims (8)

It is a method of manufacturing an electric wire with a terminal in which a coated conductor and a terminal are connected.
The terminal has a crimping portion to which the coated conductor is crimped and a terminal body.
The crimping portion has a coated crimping portion for crimping the covering portion of the coated conducting wire and a conducting wire crimping portion for crimping a conducting wire exposed from the covering portion.
The first crimping step of main crimping the conductor crimping portion and the conductor, and
A resin coating step of applying a resin member from the coated portion in the coated crimping portion to the exposed portion of the conducting wire on the tip end side of the conducting wire crimping portion.
A second crimping step of main crimping the coated crimping portion and the covering portion coated with the resin member.
A method for manufacturing an electric wire with a terminal, which comprises the above in this order. The method for manufacturing an electric wire with a terminal according to claim 1, further comprising a resin curing step of curing the resin member before the second crimping step. The method for manufacturing an electric wire with a terminal according to claim 2, wherein the hardness of the resin member after curing is lower than the hardness of the covering portion. The method for manufacturing an electric wire with a terminal according to claim 1, further comprising a resin curing step of curing the resin member after the second crimping step. The method for manufacturing an electric wire with a terminal according to any one of claims 1 to 4, wherein the viscosity of the resin member before curing is 10 to 2000 mPa · s. The method for manufacturing an electric wire with a terminal according to any one of claims 1 to 5, wherein the viscosity of the resin member before curing is 10 to 1000 mPa · s. The method for manufacturing an electric wire with a terminal according to any one of claims 1 to 6, further comprising a step of applying a resin member after the second crimping step. The method for manufacturing an electric wire with a terminal according to any one of claims 1 to 7, further comprising a temporary crimping step of temporarily crimping the coated crimping portion and the covering portion before the resin coating step. ..

Images