WO2011125348A1

WO2011125348A1 - Terminal-crimped electric wire production method, terminal-crimped electric wire, and terminal crimping device

Info

Publication number: WO2011125348A1
Application number: PCT/JP2011/050318
Authority: WO
Inventors: 朗伊東; 修岩渕
Original assignee: 住友電装株式会社
Priority date: 2010-04-01
Filing date: 2011-01-12
Publication date: 2011-10-13
Also published as: JP2011216391A

Abstract

Disclosed is a method for producing a terminal-crimped electric wire, wherein a conductor crimping portion of a solderless terminal is crimped around a conductor exposed on an end of an electric wire. The method is comprised of (a) a step of generating a temperature difference between a conductor of an electric wire and a conductor crimping portion of a solderless terminal so that the temperature of the conductor of the electric wire is relatively higher than the temperature of the conductor crimping portion of the solderless terminal, and (b) a step of crimping the conductor crimping portion of the solderless terminal around the conductor of the electric wire.

Description

Terminal crimped wire manufacturing method, terminal crimped wire and terminal crimping device

This relates to the technology for crimping terminals to electric wires.

There is a crimp connection as a method of connecting a terminal to an electric wire. For example, for a crimp terminal having a U-shaped conductor crimping portion (wire barrel), there is a method in which the conductor crimping portion is plastically deformed and crimped to the conductor portion of the electric wire. In the technical field of crimping connection of a crimp terminal to such a wire, it is required to reduce the connection resistance between the conductor portion of the wire and the conductor crimp portion of the crimp terminal as the current value flowing through the signal line becomes smaller. ing. In addition, in the case of electric wires that carry a large current, such as power lines, the conductor portions of the electric wires and the conductors of the crimp terminals are considered as much as possible in consideration of the increase in resistance due to heating of the electric conductor portions and the crimp terminals by voltage application. It is required to reduce the resistance of the terminal crimping wire by reducing the connection resistance with the crimping portion.

* In addition to the contact resistance, there is a tensile strength as an index of the crimp connection performance. In the case of the crimp connection, the balance between the tensile strength and the contact resistance is important. This tensile strength and contact resistance can be adjusted by changing the height (crimp height) after crimping of the conductor crimping part crimped to the conductor part of the electric wire. Here, the tensile strength refers to the tensile stress at the time of breakage or pull-out in the tensile test related to the conductor part of the electric wire to which the terminal is crimped. If the crimp height is too low, the cross-sectional area of the conductor part becomes small and decreases. . On the other hand, if the crimp height is too high, the fixing force between the terminal and the electric wire is reduced.

In addition, as a technique for improving the electrical connection performance between the electric wire and the terminal, there is one disclosed in Patent Document 1.

JP 2009-152051 A

There is an optimum crimp height for obtaining the desired performance for each of the above contact resistance and tensile strength. However, in general, a point that exhibits a desirable value (minimum value) of contact resistance and a point that exhibits a desirable value (maximum value) of tensile strength have different crimp heights. That is, when crimping is performed at a crimp height that provides the minimum value of contact resistance, the cross-sectional area of the conductor portion to which the conductor crimping portion is crimped may be reduced and the tensile strength may be reduced. Conversely, if crimping is performed with a crimp height that provides the maximum value of tensile strength, the contact resistance may increase. Therefore, in order to obtain stable performance, a compromise range in which both contact resistance and tensile strength are within the allowable (design) range (for example, a range in which the cross-sectional area of the wire is 70 to 90% before crimping) is a crimping characteristic. Therefore, it was necessary to determine the crimp height. However, it has been difficult to obtain desired performance when the contact resistance and the tensile strength are required to be compatible with each other as the value of the current passed through the signal line becomes smaller.

Therefore, an object of the present invention is to achieve both higher tensile strength and higher contact resistance.

The method for producing a terminal crimped electric wire according to the first aspect is a method for producing a terminal crimped electric wire in which a conductor crimping part of a plated crimped terminal is crimped to a conductor part exposed at an end of the electric wire, (A) generating a temperature difference between the conductor part and the conductor crimping part so that the temperature of the conductor crimping part is relatively higher than the temperature of the conductor part; A step of crimping the conductor crimping portion to the conductor portion.

The manufacturing method of the terminal crimped electric wire according to the second aspect is the method of manufacturing the terminal crimped electric wire according to the first aspect, wherein the step (a) is performed in the temperature range in which the plating of the crimp terminal does not melt. It has the process (a1) which heats a crimping | compression-bonding part.

The manufacturing method of the terminal crimping electric wire which concerns on a 3rd aspect is a manufacturing method of the terminal crimping electric wire which concerns on the 1st or 2nd aspect, Comprising: The said process (a) includes the process (a2) which cools the said conductor part. Have.

The terminal crimping electric wire according to the fourth aspect is a terminal crimping electric wire in which the conductor crimping portion of the crimping terminal is crimped to the conductor portion exposed at the end of the wire, and the conductor crimping portion from the temperature of the conductor portion. The conductor crimping portion is crimped to the conductor portion in a state where a temperature difference is applied between the conductor portion and the conductor crimping portion so that the temperature of the conductor is relatively higher. After the crimping, the conductor crimping part is crimped and connected to the conductor part in a state where the conductor part is expanded or contracted.

A terminal crimping apparatus according to a fifth aspect is a terminal crimping apparatus that crimps a conductor crimping part of a plated crimping terminal to a conductor part exposed at an end of an electric wire, wherein the conductor crimping part is the conductor. A temperature difference is generated between the conductor part and the conductor crimping part such that the temperature of the conductor crimping part is relatively higher than the temperature of the conductor part and the crimping die that can be crimped to the part. And a temperature control unit.

A terminal crimping apparatus according to a sixth aspect is the terminal crimping apparatus according to the fifth aspect, wherein the temperature adjusting unit can heat the conductor crimping part in a temperature range in which the plating of the crimping terminal does not melt. It has a heating mechanism.

A terminal crimping apparatus according to a seventh aspect is the terminal crimping apparatus according to the sixth aspect, wherein the crimping mold includes a lower mold capable of supporting the conductor crimping portion in a mounting shape, and the lower mold An upper mold that is arranged so as to be movable toward and away from the mold and that can be crimped to the conductor portion between the lower mold and the conductor crimping portion supported in a mounted manner on the lower mold; The heating mechanism is configured to be able to heat the upper mold, and the upper mold comes into contact with the conductor crimping section supported in a mounted manner on the lower mold, It has the 1st heating mechanism part which can heat a conductor crimping | compression-bonding part.

A terminal crimping apparatus according to an eighth aspect is the terminal crimping apparatus according to the sixth or seventh aspect, wherein the crimping mold includes a lower mold capable of supporting the conductor crimping portion in a mounting shape, An upper mold which is arranged so as to be movable toward and away from the lower mold and can be crimped to the conductor part between the lower mold and the conductor crimped part supported on the lower mold. A second heating mechanism part configured to heat the lower mold and capable of heating the conductor crimping part supported in a mounted state on the lower mold. Have

A terminal crimping apparatus according to a ninth aspect is the terminal crimping apparatus according to any one of the sixth to eighth aspects, wherein the crimp terminal is crimped to the conductor crimping part against the conductor part. A third heating mechanism capable of heating the conductor crimping portion of the crimping terminal fed to the terminal feeding mechanism; Part.

A terminal crimping apparatus according to a tenth aspect is a terminal crimping apparatus according to any one of the fifth to ninth aspects, wherein the temperature adjusting unit includes a cooling mechanism unit capable of cooling the conductor unit.

A terminal crimping apparatus according to an eleventh aspect is the terminal crimping apparatus according to the tenth aspect, wherein the cooling mechanism portion is formed with a conductor accommodating hole that can accommodate the conductor portion of the electric wire. A nitrogen supply part for supplying nitrogen cooled in the conductor accommodation hole, and a nitrogen discharge part capable of discharging the cooled nitrogen supplied in the conductor accommodation hole from the conductor accommodation hole. And the nitrogen supply part and the nitrogen discharge part of the cooling mechanism part include the conductor containing hole along the longitudinal direction of the conductor part in which the cooled nitrogen is accommodated in the conductor containing hole part. It is configured to flow in the department.

According to the method for manufacturing a terminal crimped electric wire according to the first aspect, a temperature difference is generated between the conductor portion and the conductor crimp portion so that the temperature of the conductor crimp portion is relatively higher than that of the conductor portion. For this reason, as the conductor part and the conductor crimping part return to room temperature after crimping, due to the temperature difference between the conductor part and the conductor crimping part, the conductor part expands and deforms in the direction in which the conductor part comes into close contact with the conductor crimping part. Shrinks and deforms in a direction in close contact with the conductor. Thereby, tensile strength and contact resistance can be made compatible with higher performance.

According to the method for manufacturing a terminal crimping electric wire according to the second aspect, since the conductor crimping part is heated, a temperature difference can be generated between the conductor part and the conductor crimping part. And the conductor crimping | compression-bonding part expanded by heating can shrink | contract after crimping | compression-bonding and can make contact resistance between conductor parts small. Moreover, since it heats in the temperature range which the plating of a crimp terminal does not fuse | melt, contact resistance can be made small stably.

According to the method for manufacturing a terminal crimped electric wire according to the third aspect, since the conductor portion is cooled, a temperature difference can be generated between the conductor portion and the conductor crimp portion. And the conductor part which shrink | contracted by cooling can expand | swell after crimping | compression-bonding and can make contact resistance between conductor crimping parts small.

According to the terminal crimping electric wire according to the fourth aspect, the crimping is performed in a state where a temperature difference is provided between the conductor portion and the conductor crimping portion so that the temperature of the conductor crimping portion is relatively higher than the conductor portion. As a result, the conductor portion is inflated and deformed or the conductor crimping portion is contracted and deformed. That is, the conductor portion is expanded and deformed in the direction in which the conductor crimping portion is in close contact with the conductor crimping portion, or is contracted and deformed in the direction in which the conductor crimping portion is in close contact with the conductor portion. For this reason, the tensile strength and the contact resistance can be compatible with higher performance.

According to the terminal crimping apparatus according to the fifth aspect, the temperature adjustment unit generates a temperature difference between the conductor part and the conductor crimping part so that the temperature of the conductor crimping part is relatively higher than the conductor part. It is configured. For this reason, as the conductor part and the conductor crimping part return to room temperature after crimping, the conductor part is deformed in the direction in which the conductor part is in close contact with the conductor crimping part due to the temperature difference between the conductor part and the conductor crimping part. It shrinks and deforms in the direction of tight contact with the conductor. Thereby, tensile strength and contact resistance can be made compatible with higher performance.

According to the terminal crimping apparatus according to the sixth aspect, since the conductor crimping part can be heated by the heating mechanism part, a temperature difference can be generated between the conductor part and the conductor crimping part. And the conductor crimping | compression-bonding part expanded by heating can shrink after crimping and can improve the contact force obtained from the residual stress between conductors. Moreover, since the temperature adjustment part heats in the temperature range where the plating of the crimp terminal does not melt, the contact resistance can be stably reduced.

According to the terminal crimping apparatus according to the seventh aspect, the first heating mechanism section heats the upper mold, and the upper mold comes into contact with the conductor crimping section supported in a mounted state on the lower mold. It is comprised so that a conductor crimping | compression-bonding part may be heated. Thus, since heating is started from the position where the upper mold is in contact with the conductor crimping portion, heat conduction to the conductor portion can be suppressed. Thereby, a temperature difference can be more reliably generated between the conductor part and the conductor crimping part, and the contact resistance can be reduced.

According to the terminal crimping apparatus according to the eighth aspect, the second heating mechanism section is configured to heat the lower mold, and to heat the conductor crimping section supported in a mounting shape on the lower mold. For this reason, the conductor crimping portion can be heated for a relatively long period of time when the crimping terminal is supported in a mounting shape. Thereby, a temperature difference can be stably generated between the conductor portion and the conductor crimping portion, and the contact resistance can be reduced.

According to the terminal crimping apparatus according to the ninth aspect, the third heating mechanism section is configured to heat the conductor crimping section of the crimp terminal fed to the terminal feeding mechanism section. The conductor crimping part can be heated for a relatively long period until the part is conveyed to the crimping position. Thereby, a temperature difference can be stably generated between the conductor portion and the conductor crimping portion, and the contact resistance can be reduced.

According to the terminal crimping apparatus according to the tenth aspect, since the conductor portion can be cooled by the cooling mechanism portion, a temperature difference can be generated between the conductor portion and the conductor crimp portion. And the conductor part which shrink | contracted by cooling can expand | swell after crimping | compression-bonding and can make contact resistance between conductor crimping parts small.

According to the terminal crimping apparatus according to the eleventh aspect, the cooling mechanism is configured such that the cooled nitrogen flows in the conductor accommodation hole along the longitudinal direction of the conductor accommodated in the conductor accommodation hole. Therefore, the conductor part can be cooled more reliably. Thereby, a temperature difference can be stably generated between the conductor portion and the conductor crimping portion, and the contact resistance can be reduced.

It is a perspective view which shows an electric wire and a crimp terminal. It is a figure which shows the state which crimped | bonded the crimp terminal to the electric wire. FIG. 3 is a sectional view taken along line III-III in FIG. 2. It is a schematic front view of a terminal crimping device. It is a schematic front view of a terminal crimping device. It is a figure which shows a 1st heating mechanism part. It is a figure which shows a 2nd heating mechanism part. It is a figure which shows a 3rd heating mechanism part. It is a figure which shows a 4th heating mechanism part. It is a schematic whole figure of the 1st cooling mechanism part. It is the XI-XI sectional view taken on the line of FIG. It is a figure which shows the positioning of the cooling process in a terminal crimping process. It is a figure which shows a 2nd cooling mechanism part. It is a figure which shows a crimping | compression-bonding operation | movement. It is a figure which shows a crimping | compression-bonding operation | movement. It is a figure which shows a crimping | compression-bonding operation | movement. It is a figure which shows a crimping | compression-bonding operation | movement. It is a figure which shows a crimping | compression-bonding operation | movement. It is a schematic sectional drawing which shows the contact force obtained from the residual stress which acts on a conductor part and a conductor crimping | compression-bonding part.

<1. Crimp terminal and electric wire>
First, the manufacturing method of the terminal crimping electric wire and the crimping terminal 5 and the electric wire 2 which are the objects of the terminal crimping apparatus will be described (see FIGS. 1 to 3). The crimp terminal 5 and the electric wire 2 targeted by the terminal crimping apparatus are incorporated in a wire harness of an automobile.

The electric wire 2 has a configuration in which a covering portion 2b is formed so as to cover the outer peripheral portion of the conductor portion 2a (the two-dot chain line portion in FIGS. 1 and 2). The conductor 2a is formed of a conductive material such as annealed copper, hard copper, stainless steel, or aluminum. The conductor portion 2a may be a single core wire or a stranded wire formed by twisting a plurality of strands (here, the latter as shown in FIG. 3). The covering portion 2b is made of an insulating material such as resin, here, polyvinyl chloride.

The electric wire 2 supplied to the terminal crimping apparatus is adjusted and cut, and then the covering portion 2b having a predetermined length is peeled off at an end portion thereof so that the end portion of the conductor portion 2a is exposed for a predetermined length (FIG. 1). reference).

The crimp terminal 5 is a terminal in which the connection portion 6 and the crimp portion are continuously formed in the longitudinal direction. Here, an example in which the crimping part has the conductor crimping part 7 and the covering crimping part 8 will be described. The crimp terminal 5 is formed by appropriately punching and bending a conductive plate material such as brass or copper alloy. The crimp terminal 5 is assumed to have been subjected to plating (here, tin plating). However, the crimp terminal 5 may be subjected to plating treatment such as zinc plating and gold plating in addition to tin plating.

The connection portion 6 is a portion connected to another conductive member. More specifically, when the crimp terminal 5 is a connector terminal, the connection portion 6 has a substantially rectangular plate shape or pin shape. It is formed in a male terminal connection part or a female terminal connection part such as a substantially rectangular tube. Here, an example in which the connecting portion 6 is a female terminal connecting portion having a substantially rectangular tube shape will be described. In addition, the connection part 6 may be formed in a substantially annular shape or the like in which the crimp terminal 5 can be connected to another conductive member by screwing or the like.

The conductor crimping portion 7 is provided with a pair of conductor crimping pieces 7b facing both sides of the bottom portion 7a formed in an elongated plate shape that is continuous with the connecting portion 6, and is substantially in a cross-sectional view orthogonal to the longitudinal direction of the crimping terminal 5. It is formed in a U shape. The conductor crimping part 7 is also called a wire barrel. But the conductor crimping | compression-bonding part 7 is not restricted to the form of cross-sectional substantially U shape, and may be formed in the cylindrical shape and the square tube shape.

Further, the coated crimping portion 8 is provided with a pair of coated crimping pieces 8b facing both sides of the bottom portion 8a formed in an elongated plate shape continuous with the bottom portion 7a, and in a cross-sectional view orthogonal to the longitudinal direction of the crimping terminal 5 It is formed in a substantially U shape. This covering crimping part 8 is also called an insulation barrel.

When the crimping terminal 5 is crimped to the electric wire 2, the conductor portion 2a of the electric wire 2 is disposed between the pair of conductor crimping pieces 7b, and the ends of the covering portion 2b are connected to the pair of covering crimping pieces 8b. It arrange | positions between (refer FIG. 1). In this state, by deforming the pair of conductor crimping pieces 7b toward the inside and the bottom portion 7a, the conductor crimping portion 7 is crimped to the conductor portion 2a and mechanically and electrically connected (FIG. 2). reference). FIG. 3 is a cross-sectional view showing a state where the conductor crimping portion 7 is crimped to the conductor portion 2a. Further, by deforming the pair of coated crimping pieces 8b toward the inside and the bottom 8a, the coated crimped part 8 is crimped to the coated part 2b and mechanically connected. FIG. 2 shows a terminal crimped electric wire 1 in which a crimp terminal 5 is crimped to the electric wire 2.

In the terminal crimping electric wire 1, there are tensile strength and contact resistance as the crimping performance of the conductor crimping portion 7 with respect to the conductor portion 2a. The said tensile strength has pointed out the tensile stress of the breaking point in the tensile test regarding the conductor part 2a to which the conductor crimping | compression-bonding part 7 was crimped | bonded in the completed terminal crimping electric wire 1. FIG. Further, the contact resistance is an electric resistance on the contact surface between the strands of the conductor portion 2a and the contact surface between the conductor crimping portion 7 and the conductor portion 2a.

The tensile strength and contact resistance can be adjusted by changing the crimp height, but generally, the point at which the tensile strength and the contact resistance exhibit optimum values are different. For this reason, if the crimp height is lowered to reduce the contact resistance, the cross-sectional area of the conductor portion 2a may be reduced and the tensile strength may be reduced. Further, when the crimp height is determined so as to ensure the tensile strength, the contact resistance may increase.

Therefore, the inventor noticed that the contact load (contact force obtained from the residual stress) between the conductor crimping part 7 and the conductor part 2a has an influence on the contact resistance, and crimped with a crimp height that exhibits high tensile strength. In order to obtain a small contact resistance, pressure bonding that improves the contact force obtained from the residual stress was studied. And the inventor considered manufacturing the terminal crimping electric wire 1 using the thermal expansion or thermal contraction of the conductor crimping part 7 and the conductor part 2a.

The terminal crimping electric wire 1 manufactured on the basis of the above technical idea is formed between the conductor crimping part 7 and the conductor crimping part 7 so that the temperature of the conductor crimping part 7 is relatively higher than the temperature of the conductor part 2a. The conductor crimping part 7 is crimped | bonded with respect to the conductor part 2a in the state to which the temperature difference was provided between. Thereby, after crimping, the conductor crimping portion 7 is crimped and connected to the conductor portion 2a in a state where the conductor portion 2a is expanded or contracted and deformed. More specifically, the conductor part 2a is cooled to a temperature lower than room temperature and is crimped, so that the conductor part 2a is expanded and deformed in the direction in which the conductor part 2a is in close contact with the conductor crimping part 7. Further, the conductor crimping portion 7 is heated to a temperature higher than normal temperature and is crimped, so that the conductor crimping portion 7 is contracted and deformed in the direction in which the conductor crimping portion 7 is in close contact with the conductor portion 2a. That is, the terminal crimping terminal 1 is crimped so that the force acting so that the conductor portion 2a and the conductor crimping portion 7 are in close contact with each other works more greatly. Here, the normal temperature is the temperature at the manufacturing site of the terminal crimped electric wire 1.

The contact force obtained from the residual stress between the conductor part 2a and the conductor crimping part 7 can be improved by the deformation of the conductor part 2a or the conductor crimping part 7 after the crimping. That is, the contact resistance between the conductor part 2a and the conductor crimping part 7 can be reduced. In addition, since the contact resistance is reduced without reducing the crimp height, it is possible to suppress the cross-sectional area of the conductor portion 2a after being crimped from being reduced, and the reduction in tensile strength can be suppressed. As described above, due to the action of the conductor portion 2a or the conductor crimping portion 7, the terminal crimped electric wire 1 can suppress the decrease in the tensile strength and reduce the contact resistance, thereby improving the tensile strength and the contact resistance. Can be compatible.

In addition, the manufacturing method of the terminal crimping electric wire mentioned later and the crimp terminal 5 which a terminal crimping apparatus makes object are not limited to the said form, Various crimp terminals can be applied. For example, the manufacturing method of the terminal crimped electric wire and the terminal crimping apparatus can also be applied to a crimping process of a crimping terminal having a crimping terminal and a crimping part (conductor crimping part 7) that do not have the covering crimping part 8. In the following description of the method for manufacturing a terminal crimping electric wire and the terminal crimping device, the crimping terminal is an example of a crimping terminal 5 having a connecting portion 6, a conductor crimping portion 7 having a substantially U shape in cross section, and a covering crimping portion 8. I will explain it.

The crimp terminals 5 may be supplied one by one at the time of terminal crimping, or may be supplied in a form of being connected in a chain. In the terminal crimping apparatus described later, the latter is adopted, and a plurality of crimp terminals 5 are supplied in a form of being connected in parallel in the longitudinal direction at equal intervals to the elongated strip-shaped connecting portion 9 (see FIG. 4). ). Such a plurality of chain-like crimp terminals 5 can be integrally formed by punching from one plate-like member and bending.

<2. Manufacturing method of terminal crimped wire>
The manufacturing method of the terminal crimping electric wire 1 which crimped | bonded the crimp terminal 5 with respect to the said electric wire 2 is demonstrated.

The manufacturing method of the terminal crimping electric wire 1 is a step of generating a temperature difference between the conductor portion 2a and the conductor crimping portion 7 so that the temperature of the conductor crimping portion 7 is relatively higher than the temperature of the conductor portion 2a. (A) and the process (b) which crimps | bonds the conductor crimping | compression-bonding part 7 with respect to the conductor part 2a.

In step (a), a temperature difference is generated between the conductor portion 2a and the conductor crimping portion 7 so that a temperature difference is generated between the conductor portion 2a and the conductor crimping portion 7 at least when the crimping is completed. It has become. More specifically, a temperature difference may be generated between the conductor part 2a and the conductor crimping part 7 before or during the crimping between the conductor part 2a and the conductor crimping part 7. Here, the term “before crimping” refers to a state before a compressive force is applied to the conductor crimping portion 7, and the term of crimping refers to a state in which the conductor crimping portion 7 has applied the compressing force to the conductor crimping portion 7. It refers to the state until the conductor part 2a is compressed and deformed by contacting the conductor part 2a. That is, as the order of the step (a) and the step (b), the step (b) may be performed after the step (a), or the step (a) and the step (b) are performed at the same time. May be.

This step (a) includes a step (a1) of heating the conductor crimping portion 7 and a step (a2) of cooling the conductor portion 2a.

In the step (a1), the conductor crimping portion 7 is heated in a temperature range higher than normal temperature and at which the plating of the crimp terminal 5 does not melt. More specifically, the upper limit temperature of heating is set to a temperature lower than 230 ° C. which is the melting point of tin plating of the crimp terminal 5 subjected to tin plating.

Incidentally, JP-A-9-263992 discloses a reflow treatment of a tin-plated steel plate similar to that used for manufacturing the crimp terminal 5. In this reflow process, the temperature is preheated to about 200 ° C., which is slightly lower than the melting point of tin plating. In the embodiment, the preheating temperature is set to 150 ° C. with the heating medium temperature set to 200 ° C. in consideration of the line speed and prevention of overheating when the apparatus is stopped.

In the present embodiment, the upper limit temperature of heating is set lower than 200 ° C. from the viewpoint of maintaining the spring characteristics of the crimp terminal 5. Furthermore, from the viewpoint of preventing the above-described line speed reduction and overheating when the apparatus is stopped, 150 ° C. is preferably set as the upper limit temperature of heating. In addition, it is thought that the softening of tin plating can also be avoided by setting the upper limit temperature to 150 ° C. Including the viewpoint of generating a higher temperature difference between the conductor portion 2a and the conductor crimping portion 7, the conductor crimping portion 7 may be heated to a temperature in the range of 50 ° C. to 150 ° C. higher than the normal temperature. For example, when the temperature at the manufacturing location of the terminal crimped electric wire 1 is controlled in the temperature range of 15 ° C. to 28 ° C., the heating temperature may be set in the range of 78 ° C. to 150 ° C.

However, when the crimp terminal 5 is subjected to a plating treatment other than tin plating, it is experimental from the viewpoint of the melting point of the plating material, the temperature difference between the conductor portion 2a and the conductor crimp portion 7, etc., depending on the plating material. The temperature range for heating may be determined empirically.

As a method of heating the conductor crimping part 7 in the step (a1), for example, a method of increasing the temperature of the conductor crimping part 7 by bringing a heating member such as a ceramic heater into contact with the conductor crimping part 7 is adopted. it can. In addition, a method of increasing the temperature by injecting hot air to the conductor crimping portion 7 or a method of increasing the temperature of the crimp terminal 5 itself in a heating tank in which a heating medium is accommodated in advance may be used. When using a heating tank, since the whole crimp terminal 5 is heated, it is good to set to the temperature which the coating | coated part 2b which the coating crimping part 8 contacts does not melt | dissolve.

Further, in the step (a2), the conductor portion 2a is cooled in a temperature range that is lower than normal temperature and that the covering portion 2b covered with the conductor portion 2a is not cooled to the embrittlement temperature as the conductor portion 2a is cooled. More specifically, for example, in the case of the electric wire 2 having the covering portion 2b made of polyvinyl chloride having an embrittlement temperature of −70 ° C., the conductor portion 2a may be cooled in a temperature range higher than −70 ° C. Including the viewpoint of generating a higher temperature difference between the conductor portion 2a and the conductor crimping portion 7, the conductor portion 2a may be cooled to a temperature in the range of 50 ° C. to −70 ° C. lower than normal temperature. For example, when the temperature at the manufacturing location of the terminal crimped electric wire 1 is controlled in the temperature range of 15 ° C. to 28 ° C., the cooling temperature may be set in the range of −35 ° C. to −70 ° C.

As a method of cooling the conductor part 2a in the step (a2), for example, a method of lowering the temperature of the conductor part 2a by contacting a member cooled with a refrigerant or the like, a Peltier element, or the like can be employed. In addition, a method of lowering the temperature of the conductor portion 2a in a cooling tank containing a cooling medium, or a method of lowering the temperature by injecting cooled nitrogen to the conductor portion 2a may be used.

From the viewpoint of obtaining a larger temperature difference and from the viewpoint of preventing the performance deterioration of the crimp terminal 5 and the electric wire 2, the temperature difference between the conductor part 2a and the conductor crimp part 7 is 50 to 200 ° C. as a whole. C More preferably, the conductor portion 2a is cooled to −50 ° C., and the conductor crimping portion 7 is heated to 150 ° C. to adjust the temperature so that the temperature difference becomes 200 ° C.

In addition, as for the said process (a1) and a process (a2), even if any one process is performed, both processes may be performed, and when both processes are performed, each process is in order (before and after). Unquestioned) or at the same time.

In the step (b), first, the crimp terminal 5 and the electric wire 2 are disposed between the pair of conductor crimping pieces 7b and the conductor portion 2a is disposed between the pair of conductor crimping pieces 7b. They are held in a positional relationship such that they are arranged between them. At this time, it is preferable to hold the conductor portion 2a so as to leave a gap with respect to the bottom portion 7a and the pair of crimping pieces 7b. That is, the conductor crimping part 7 that is heated or heated from now on and the conductor part 2a that is cooled or cooled from now on come into contact and conducts heat, so that there is a temperature difference between the conductor crimping part 7 and the conductor part 2a. It is better not to get smaller. Holding of the crimp terminal 5 and the electric wire 2 may be performed manually by an operator or by a holding mechanism such as an electric chuck.

Next, the conductor crimping portion 7 is crimped to the conductor portion 2a disposed between the pair of conductor crimping pieces 7b. More specifically, the pair of conductor crimping pieces 7b are deformed toward the inside and the bottom 7a side. Thereby, the conductor crimping | compression-bonding part 7 is crimped | bonded to the conductor part 2a electrically and mechanically. The crimped conductor crimping portion 7 has a shape deformed in a curved shape toward the inside and the bottom portion 7a so that the pair of conductor crimping pieces 7b are arranged adjacent to each other.

Furthermore, the coated crimping portion 8 is crimped to the coated portion 2b disposed between the pair of coated crimped pieces 8b. More specifically, the pair of coated crimping pieces 8b are deformed toward the inside and the bottom 8a side. Thereby, the covering crimping part 8 is mechanically crimped and connected to the covering part 2b.

The crimping of the conductor crimping portion 7 and the covering crimping portion 8 may be performed either simultaneously or simultaneously. Moreover, the said crimping | compression-bonding may be performed manually by the crimping pliers etc., and may be automatically performed by the dedicated terminal crimping apparatus which is mentioned later.

According to the method for manufacturing a terminal crimping electric wire, a temperature difference is generated between the conductor portion 2a and the conductor crimping portion 7 so that the temperature of the conductor crimping portion 7 is relatively higher than that of the conductor portion 2a. More specifically, the conductor crimping portion 7 is contracted and deformed as it returns to room temperature after crimping by crimping in a state where the conductor crimping portion 7 is heated to a temperature higher than room temperature and expanded. In addition, the conductor portion 2a is crimped in a contracted state after being cooled to a temperature lower than the normal temperature, so that the conductor portion 2a expands and deforms as the temperature returns to the normal temperature after the press bonding. That is, when the conductor crimping part 7 crimped so as to cover the outer peripheral part of the conductor part 2a is contracted and deformed, a force acts in a direction in close contact with the conductor part 2a, and the conductor part 2a is expanded and deformed. A force acts in a direction in close contact with the conductor crimping portion 7. Thereby, the contact force obtained from the residual stress between the conductor part 2a and the conductor crimping | compression-bonding part 7 improves, and it connects more firmly than the time of crimping completion. That is, compared with the case where no temperature difference is provided, the contact pressure obtained from the high residual stress can be obtained and the contact resistance can be reduced similarly to the case where the crimp height is lowered. It is possible to keep the cross-sectional area of the conductor portion 2a at a relatively large portion. As a result, the tensile strength and the contact resistance can be compatible with high performance.

The method for manufacturing the terminal crimping electric wire is not only the above-described crimping terminal 5 but also a crimping terminal having no covering crimping portion 8 or a crimping terminal having a cylindrical conductor crimping portion and crimping to the electric wire 2 for terminal crimping. An electric wire can be manufactured.

Even when crimping a crimp terminal having a cylindrical conductor crimping part, it is preferable to cool the conductor part 2a of the electric wire 2 and heat the conductor crimping part before crimping. For example, crimping of such a crimp terminal can be performed by inserting the conductor portion 2a into the conductor crimp portion and crimping the conductor crimp portion at a plurality of locations in the circumferential direction of the conductor crimp portion. Thereby, after crimping, the conductor portion 2a expands and deforms as it returns to room temperature, and the conductor crimp portion contracts and deforms as it returns to room temperature, and contact obtained from the residual stress between the conductor portion 2a and the conductor crimp portion 7 The contact resistance can be reduced by improving the force.

<3. Configuration of terminal crimping device>
Next, a configuration of the terminal crimping apparatus 10 will be described as an example of an apparatus used for manufacturing the terminal crimping electric wire 1 (see FIGS. 4 and 5).

The terminal crimping apparatus 10 includes a lower mold (anvil) 20, an upper mold (crimp) 30, an electric wire holding unit 40, a terminal feeding mechanism unit 50, and a temperature adjusting unit 60. The terminal crimping device 10 moves the crimping terminal 5 fed by the terminal feeding mechanism unit 50 between the lower mold 20 and the upper mold 30 to the electric wire 2 held by the electric wire holding unit 40. It is a device that crimps by proximity movement. Further, the terminal crimping device 10 causes the temperature adjusting unit 60 to generate a temperature difference so that the conductor crimping part 7 of the crimping terminal 5 is relatively hotter than the conductor part 2a of the electric wire 2 when the crimping is completed. It is configured. That is, the contact force obtained from the residual stress between the conductor part 2a after crimping and the conductor crimping part 7 is improved by the difference in thermal expansion and thermal shrinkage due to the temperature difference between the conductor part 2a and the conductor crimping part 7. The contact resistance is reduced.

The lower mold 20 is fixed on the base 28 and is configured to be able to support the crimp terminal 5 in a mounting shape (see FIG. 4). The lower mold 20 has a first lower mold 22 for deforming the conductor crimping part 7 of the crimp terminal 5 and a second lower mold 24 for deforming the covering crimping part 8 (FIG. 5).

A first lower pressure-bonding surface 22a capable of supporting the conductor pressure-bonding portion 7 (bottom portion 7a) in a mounting shape is formed at the tip of the first lower mold 22. The first lower crimping surface 22a is an arcuate circumferential surface around the axis along the longitudinal direction of the crimping terminal 5 supported in a mounting shape, which is concave toward the upper side (see FIGS. 5 and 6). Similarly, a second lower pressure bonding surface 24a capable of supporting the covering pressure bonding portion 8 (bottom portion 8a) in a mounting shape is formed at the tip of the second lower mold 24. The first lower mold 22 and the second lower mold 24 are formed on the second lower crimping surface 24a in a state where the conductor crimping portion 7 is supported on the first lower crimping surface 22a. The covering crimping portion 8 is disposed so as to be able to support the mounting shape.

The upper die 30 has a first upper die 32 for crimping the conductor crimping portion 7 of the crimp terminal 5 and a second upper die 34 for crimping the coated crimping portion 8 (see FIG. 5).

The first upper mold 32 is configured such that the conductor crimping part 7 supported in a mounted manner on the first lower mold 22 can be crimped to the conductor part 2 a between the first lower mold 32. . The first upper mold 32 is disposed at a position facing the first lower mold 22, and the first lower mold 22 is driven by a drive mechanism unit 38 such as a drive mechanism including a motor, an air cylinder, and a hydraulic cylinder. It is arranged so as to be movable toward and away from the first lower mold 22 (see FIGS. 4 and 5). Here, as will be described later, since the lowering operation of the first upper mold 32 may be stopped or slowed based on the set position or the like, a drive mechanism including a servo motor is employed as the drive mechanism unit 38. The first upper mold 32 has a first upper pressure-bonding surface 32a formed in a concave shape extending in the depth direction from the distal end portion toward the proximal end portion. The back side surface of the first upper pressure-bonding surface 32a faces the first lower pressure-bonding surface 22a (see FIG. 5).

The first upper pressure-bonding surface 32a is formed in a shape that has an arcuate circumferential surface whose back portion is concave toward the tip side, and both inner surfaces facing each other on the tip side gradually taper toward the tip side. It is formed in a shape (see FIG. 6). Then, when the first upper mold 32 is moved close to the first lower mold 22 in a state where the conductor crimping portion 7 is supported on the first lower crimping surface 22 a of the first lower mold 22. The pair of conductor crimping pieces 7b are deformed toward the inner side and the bottom 7a side while being in sliding contact with the first upper crimping surface 32a.

The second upper mold 34 has a second upper pressure-bonding surface 34 a and can be moved toward and away from the second lower mold 24 by the drive mechanism 38 at a position facing the second lower mold 24. (See FIG. 5). When the conductor crimping portion 7 is crimped between the first lower mold 22 and the first upper mold 32, the second upper mold 34 is also moved close to the second lower mold 24, and the pair The cover crimping piece 8b is deformed while being in sliding contact with the second upper crimping surface 34a.

The electric wire holding part 40 is located on the second lower mold 24 while the conductor part 2a is positioned between the pair of conductor crimping pieces 7b of the conductor crimping part 7 supported in a mounted manner on the first lower mold 22. The electric wire 2 can be held so that the covering portion 2b is positioned between the pair of covering pressure-bonding pieces 8b of the covering pressure-bonding portion 8 supported in a mounted manner (see FIGS. 4 and 5). Here, the electric wire holding portion 40 is configured to hold the electric wire 2 at a position where the conductor portion 2a forms a gap with respect to the crimp terminal 5 (at least the conductor crimp portion 7). The electric wire holding part 40 can adopt a general gripping mechanism including an electric chuck mechanism or the like as long as the electric wire 2 can be held at the above position by holding the covering part 2b of the electric wire 2.

The electric wire holding part 40 may be attached to a drive mechanism (not shown). That is, the electric wire holding part 40 is gripped between the position where the electric wire 2 is received from the cutter unit for cutting the adjusted electric wire 2 and the crimping position of the crimp terminal 5 and between the crimping position and the product discharge position. It is good to be comprised so that the electric wire 2 can move. The electric wire holding part 40 is also movable in the longitudinal direction of the electric wire 2 to be held by the drive mechanism so that the held electric wire 2 can be inserted into a conductor receiving hole 73 of the cooling mechanism part 72 described later. (See FIGS. 10 and 11). As a drive mechanism which moves the electric wire holding | maintenance part 40, the structure containing an air cylinder, a linear motor, etc. is employable, for example.

In the terminal feeding mechanism 50, the crimping terminal 5 is supported in such a manner that the conductor crimping portion 7 is placed on the first lower mold 22 and the covering crimping portion 8 is placed on the second lower mold 24. It is configured to be able to feed to a supported position (see FIG. 4). Here, an example in which the terminal feeding mechanism unit 50 feeds a plurality of chain-like crimp terminals 5 sequentially to the above positions will be described. The terminal feeding mechanism 50 is configured such that the base ends (ends on the side of the cover crimping portion 8) of the plurality of crimping terminals 5 are connected in parallel to the elongated strip-like connecting portion 9 at equal intervals in the longitudinal direction. In this configuration, the crimp terminal 5 is fed.

More specifically, the terminal feeding mechanism unit 50 is disposed on the base 28 and has a structure in which a plurality of chain-like crimp terminals 5 are intermittently fed in a predetermined feed direction P for each pitch of the crimp terminals 5. It is said that. As a mechanism for intermittently feeding the crimp terminals 5 at every pitch, for example, as shown by phantom lines in FIG. By projecting upward and downward and moving in a feed direction P by a predetermined distance, the crimp terminal 5 is hooked by a feed claw member 52 and intermittently fed by one pitch in the feed direction P. The feed claw member 52 is configured to transmit the raising / lowering operation of the upper mold 30 by the drive mechanism unit 38 in the feed direction P by a predetermined cam or link mechanism and to be driven in conjunction with the operation of the upper mold 30. It is good to be. Here, the terminal feeding mechanism section 50 has a feeding base 54 capable of supporting a plurality of chain-shaped crimp terminals 5 in a mounting manner, and a plurality of chain-shaped crimps intermittently fed by a feed claw member 52. The terminal 5 is configured to be fed by sliding on the feeding table 54.

The terminal feeding mechanism unit 50 may be a mechanism that feeds by an actuator such as an air cylinder different from the driving mechanism unit 38. Also, a plurality of crimp terminals 5 may be supplied in the form of being connected in the longitudinal direction, and may be intermittently fed with the longitudinal dimension as one pitch, or the crimp terminals 5 may be fed alone (for example, one It is also possible to hold and feed each one).

The crimp terminal 5 fed to the position where it is supported on the lower mold 20 by the terminal feeding mechanism 50 is configured to be separated from the connecting portion 9 by a cutting blade (not shown). It is good to be.

The terminal crimping device 10 is configured to control the operation of the drive mechanism unit 38 and the electric wire holding unit 40 by the control unit 80. The control unit 80 is a general computer having a CPU, a RAM, a ROM, an input / output circuit, etc. (not shown). The control unit 80 is controllably connected to the drive mechanism unit 38 so as to move the first upper mold 32 and the second upper mold 34 up and down. In addition, the control unit 80 can hold and release the electric wire 2 and can move between the cutter unit position, the crimping position, and the product discharge position and can move in the longitudinal direction of the electric wire 2. 40 is controllably connected. Further, when the terminal feeding mechanism unit 50 includes an actuator in addition to the drive mechanism unit 38, the control unit 80 controls the terminal feeding mechanism unit 50 so that the crimp terminal 5 can be intermittently fed at a predetermined interval. It should be connected in a controllable manner. Here, the control unit 80 is configured to control the operation of the drive mechanism unit 38 and the electric wire holding unit 40 in synchronization.

The temperature adjusting unit 60 generates a temperature difference between the conductor portion 2a and the conductor crimping portion 7 so that the temperature of the conductor crimping portion 7 is relatively higher than the temperature of the conductor portion 2a at least when the crimping is completed. It is a configuration. That is, the temperature adjustment unit 60 is configured to adjust the temperature of the conductor portion 2a and the conductor crimping portion 7 before completion of the crimping. As a method of generating a temperature difference between the conductor part 2a and the conductor crimping part 7, there are a method of cooling the conductor part 2a to a temperature lower than room temperature and a method of heating the conductor crimping part 7 to a temperature higher than room temperature. is there.

The temperature adjusting unit 60 can heat the conductor crimping part 7 in a temperature range in which the plating of the crimp terminal 5 does not melt. More specifically, the upper limit temperature for heating is set to a temperature lower than 230 ° C., which is the melting point of tin plating of the crimp terminal 5 subjected to tin plating, and preferably set to be lower than 200 ° C. from the viewpoint of maintaining the spring characteristics of the crimp terminal 5. It is good to be done. Furthermore, from the viewpoint of preventing a reduction in line speed and overheating when the apparatus is stopped, 150 ° C. is preferably set as the upper limit temperature of heating. In addition, it is thought that the softening of tin plating can also be avoided by setting the upper limit temperature to 150 ° C. Including the viewpoint of generating a higher temperature difference between the conductor portion 2a and the conductor crimping portion 7, the temperature adjusting unit 60 heats the conductor crimping portion 7 in a temperature range of 150 ° C to 50 ° C higher than normal temperature. Good. For example, when the temperature at the manufacturing location of the terminal crimped electric wire 1 is controlled in the temperature range of 15 ° C. to 28 ° C., the heating temperature may be set in the range of 78 ° C. to 150 ° C.

Moreover, the temperature control part 60 is comprised so that the conductor part 2a can be cooled in the temperature range higher than the embrittlement temperature of the coating | coated part 2b of the electric wire 2. FIG. More specifically, for example, in the case of the electric wire 2 having the covering portion 2b made of polyvinyl chloride having an embrittlement temperature of −70 ° C., including the viewpoint of generating a higher temperature difference, the temperature adjusting portion 60 is The conductor portion 2a may be cooled to a temperature range of 50 ° C. to −70 ° C. below normal temperature. For example, when the temperature at the manufacturing location of the terminal crimped electric wire 1 is controlled in a temperature range of 15 ° C. to 28 ° C., the heating temperature may be set in the range of −35 ° C. to −70 ° C.

From the viewpoint of obtaining a larger temperature difference and preventing the performance deterioration of the crimp terminal 5 and the electric wire 2, the temperature adjusting unit 60 sets the temperature difference between the conductor portion 2 a and the conductor crimp portion 7 to 50 ° C. to 200 ° C. Good. That is, more preferably, the conductor portion 2a is cooled to −50 ° C., and the conductor crimping portion 7 is heated to 150 ° C. to adjust the temperature so that the temperature difference becomes 200 ° C.

In order to generate a temperature difference between the conductor portion 2a and the conductor crimping portion 7 as described above, the temperature adjusting portion 60 has a heating mechanism portion 62 and a cooling mechanism portion 72 (FIGS. 4 and 4). 5).

The heating mechanism unit 62 (first heating mechanism unit 62) is configured to be able to heat the first upper mold 32, and the first upper mold 32 is supported on the first lower mold 22 in a mounting manner. By contacting the conductor crimping portion 7, the conductor crimping portion 7 can be heated (see FIG. 6). The heating mechanism unit 62 includes a heat generating unit 64, a temperature sensor 66, and a heating control unit 68.

The heat generating unit 64 is disposed so as to contact the first upper mold 32, is connected to the heating control unit 68 in series by a conducting wire, and generates heat when a current flows from the heating control unit 68 through the conducting wire. It is configured. Here, as shown in FIG. 6, the two rod-shaped heat generating portions 64 are arranged so as to contact with the first upper mold 32 while being inserted. However, the heat generating portion 64 is not limited to a rod shape, and may have a plate shape, a cylindrical shape, or the like, or a single or a plurality of three or more. In addition, a temperature sensor 66 is attached to the first upper mold 32, and the temperature sensor 66 is connected to the heating control unit 68 so that temperature information of the first upper mold 32 can be output. Then, the heating control unit 68 causes the heat generating unit 64 to generate heat based on the temperature information acquired by the temperature sensor 66 so that the temperature of the first upper mold 32 becomes the set temperature, and the first upper mold 32 is moved. It is configured to heat. In order to heat the conductor crimping portion 7 to 150 ° C., for example, the first upper mold 32 may be heated to about 180 ° C.

As the heating mechanism 62, various heating devices including a general ceramic heater can be employed.

The first upper mold 32 heated by the heating mechanism 62 heats the conductor crimping part 7 when the first upper crimping surface 32a contacts the pair of conductor crimping pieces 7b during the crimping.

In this terminal crimping apparatus 10, in order to heat the conductor crimping part 7 more reliably, the lowering operation of the first upper mold 32 by the drive mechanism 38 during terminal crimping is stopped at a position halfway to the crimping bottom dead center. It is configured to become. More specifically, in the heated first upper mold 32, the conductor portion 2a is compressed and deformed from the position where the first upper crimping surface 32a first contacts the pair of conductor crimping pieces 7b (see FIG. 15). It is set so as to stop or slow down in at least one part of the range up to the previous position (see FIG. 16). That is, the temperature of the conductor crimping portion 7 is preferably increased to the set temperature, and stopped or slowed down so as to be heated within a range in which the temperature of the conductor portion 2a is not increased (for example, set to 0.5 seconds). Here, the speed of the first upper mold 32 is reduced, and the load applied to the apparatus during re-operation can be reduced by reducing the speed of the first upper mold 32 rather than stopping. More preferably, the lowering operation of the first upper mold 32 is performed over the entire range from the position where the first upper crimping surface 32a first contacts the pair of conductor crimping pieces 7b to the position before the conductor portion 2a is compressed and deformed. It is better to make it slower than the front and back operating speed. In addition, it is good for the raising / lowering speed before and behind the period to reduce in speed so that it can suppress that the heat | fever of the conductor crimping | compression-bonding part 7 is conducted with respect to the conductor part 2a.

When adopting the heating mechanism 62, the drive mechanism 38 may include a servo motor. That is, when the lowering speed of the upper mold 30 (first upper mold 32) is reduced, a servo motor capable of adjusting the speed is suitable.

The first upper die 32 is moved downward at a normal speed after stopping or after the end of the speed reduction period, and moved up to the bottom dead center of the pressure bonding (compression completion) and immediately moved up at the normal speed. . That is, before the completion of the crimping, the first upper mold 32 is prevented from being conducted to the conductor 2a in order to prevent the heat of the first upper mold 32 and the heated conductor crimping part 7 from being conducted to the conductor 2a. 7 is configured to make the time of contact with 7 as short as possible. Thereby, the temperature difference of the conductor crimping | compression-bonding part 7 and the conductor part 2a at the time of completion of crimping can be maintained more reliably. The timing, period, or position at which the speed is reduced is such that the conductor crimping portion 7 is sufficiently heated by the contact between the first upper mold 32 and the conductor crimping portion 7, and the heat conduction between the conductor crimping portion 7 and the conductor portion 2a. Therefore, it may be determined experimentally and empirically from the viewpoint of preventing the temperature difference therebetween from becoming small. The timing, period, or position at which the speed is reduced is set in advance by a program, and the control unit 80 controls the drive mechanism unit 38 based on the set value to move the upper mold 30 up and down. It is good to have.

The cooling mechanism 72 (first cooling mechanism 72) includes a main body 74, a nitrogen supply unit 76, and a nitrogen discharge unit 78 (see FIGS. 10 and 11).

The main body 74 is a member in which a conductor accommodation hole 73 capable of accommodating the conductor 2a of the electric wire 2 is formed. The conductor housing hole 73 is formed in a substantially circular hole shape that opens on one side and extends linearly in a cross-sectional view. The opening side portion of the conductor housing hole 73 is formed in a tapered shape that gradually expands toward the opening side in order to guide the electric wire 2 into the conductor housing hole 73. Further, on the back side of the taper portion, a rubber packing 75 is provided that can adhere to the outer peripheral portion of the covering portion 2b of the electric wire 2 inserted into the conductor accommodating hole portion 73 over the entire circumferential direction ( FIG. 11). When the electric wire 2 is inserted into the conductor accommodation hole 73 through the opening, the conductor 2 a is disposed on the back side of the conductor accommodation hole 73, and the covering portion 2 b is in close contact with the rubber packing 75. In a state where the rubber packing 75 is in close contact with the outer peripheral portion of the covering portion 2b, the opening of the conductor housing hole 73 is closed while maintaining airtightness and watertightness.

In addition, since the electric wire holding | maintenance part 40 inserts the electric wire 2 in the conductor accommodating hole 73 as mentioned above, it can move also to the longitudinal direction of the electric wire 2 in the state holding the electric wire 2 (FIG. 10, see FIG.

The nitrogen supply unit 76 is configured to be able to supply nitrogen N cooled in the conductor accommodation hole 73. More specifically, the nitrogen supply unit 76 can supply liquid nitrogen or nitrogen N vaporized so as to reach a set temperature into the conductor housing hole 73 through the supply pipe 77. Here, nitrogen N vaporized so that liquid nitrogen is about −50 ° C. is supplied. The supply pipe 77 is inserted into the conductor receiving hole 73 from the outside of the main body 74 so that the tip end portion opens to the inner side of the conductor packing hole 73 from the rubber packing 75.

The nitrogen discharge part 78 is a part that can discharge the cooled nitrogen N supplied into the conductor accommodation hole 73 from the conductor accommodation hole 73. More specifically, the nitrogen discharge part 78 is a tubular member, and the main body is formed from inside the conductor housing hole 73 so that the base end portion opens inside the rubber packing 75 of the conductor housing hole 73. It is inserted and disposed outside the portion 74. The nitrogen N discharged from the nitrogen discharge unit 78 may be diffused outward or may be circulated to the nitrogen supply unit 76. Moreover, the nitrogen exhaust part 78 may be comprised so that suction | emission is possible so that the cooled nitrogen N supplied in the conductor accommodation hole part 73 may be forcedly discharged.

The nitrogen supply part 76 and the nitrogen discharge part 78 are configured so that the cooled nitrogen N flows in the conductor accommodation hole 73 along the longitudinal direction of the conductor part 2a accommodated in the conductor accommodation hole 73. It is configured (see FIG. 11). More specifically, the distal end portion of the supply pipe 77 of the nitrogen supply portion 76 and the proximal end portion of the nitrogen discharge portion 78 are formed so as to open at positions separated in the longitudinal direction of the conductor housing hole portion 73. . Here, the distal end portion of the supply pipe 77 of the nitrogen supply portion 76 is at a position on the back side closest to the rubber packing 75 (preferably, the back side from the front end portion of the covering portion 2b so as to suppress cooling of the covering portion 2b). In addition to opening, the base end portion of the nitrogen discharge portion 78 is formed to open at a position immediately before the back portion of the conductor accommodation hole portion 73. Thereby, the cooled nitrogen N supplied from the rubber packing 75 side flows from the rubber packing 75 side toward the back side and is discharged from the back side.

But the opening position of the front-end | tip part of the supply pipe | tube 77 of the nitrogen supply part 76 and the base end part of the nitrogen discharge part 78 is not restricted to the said positional relationship, If it is spaced apart in the longitudinal direction of the conductor accommodating hole part 73, it will be as above. The reverse positional relationship may be used. In FIG. 11, the distal end portion of the supply pipe 77 of the nitrogen supply portion 76 and the proximal end portion of the nitrogen discharge portion 78 are opened in a direction substantially orthogonal to the longitudinal direction of the conductor housing hole portion 73. However, the present invention is not limited to this, and for example, one of the conductor accommodation holes 73 may be configured to open at the back end face.

Further, the cooling mechanism 72 is not limited to the configuration inserted into the conductor receiving hole 73 from the opening as described above, and the main body of FIG. 10 is arranged so that the electric wire 2 can be disposed from the side of the main body 74. The conductor 74 is divided in half along the longitudinal direction of the conductor housing hole 73 at the position of the one-dot chain line attached to the portion 74, and is configured to be able to contact and separate between the open position and the closed position by an actuator such as an air cylinder. Also good.

As described above, the cooling mechanism 72 is configured such that the cooled nitrogen N flows in the conductor housing hole 73 along the longitudinal direction of the conductor 2a. The entire conductor portion 2a can be efficiently cooled by touching 2a for a relatively long period of time. Further, since the rubber packing 75 is provided in the opening side portion of the conductor accommodating hole 73, the cooled nitrogen N is present in the covering portion 2b disposed on the opening side from the position where the rubber packing 75 is in close contact. I can't spray. Thereby, it can suppress that the coating | coated part 2b is cooled and embrittles.

Moreover, since this cooling mechanism part 72 cools the conductor crimping | compression-bonding part 7 with the cooled nitrogen N, it can avoid the oxidation of the crimp terminal 5 compared with the case where oxygen is used, and makes flammability low. There is also an advantage of being able to.

The cooling mechanism 72 is disposed in a pre-process of terminal crimping (for example, between the cutter unit and the terminal crimping apparatus 10 in the pressure welding machine), and after the electric wire 2 is cut and peeled, the terminal crimping apparatus. The conductor portion 2a is cooled until it is supplied to 10 (the electric wire 2 is moved between the lower mold 20 and the upper mold 30) (see FIG. 12). Preferably, cooling is preferably performed immediately before crimping, that is, immediately before the conductor portion 2 a is disposed between the pair of conductor crimping pieces 7 b of the conductor crimping portion 7.

By the combination of the heating mechanism unit 62 and the cooling mechanism unit 72 as described above, the temperature adjusting unit 60 heats the conductor crimping part 7 of the crimp terminal 5 and cools the conductor part 2a of the electric wire 2, and when the crimping is completed, It is possible to generate a larger temperature difference between the part 2a and the conductor crimping part 7 (here, the conductor part 2a has a temperature difference of −50 ° C. and the conductor crimping part 7 has a temperature difference of 150 ° C. and 200 ° C.). Thereby, the conductor crimping part 7 expands and the conductor part 2a contracts. When the conductor crimping part 7 is crimped to the conductor part 2a in this state, after crimping, the conductor crimping part 7 contracts while the temperature drops to room temperature, and the conductor part 2a expands while the temperature rises to room temperature. That is, the conductor crimping portion 7 is contracted and deformed in a direction in close contact with the conductor portion 2 a, and the conductor portion 2 a is inflated and deformed in a direction in close contact with the conductor crimping portion 7. Thereby, the contact force obtained from the residual stress between the conductor crimping part 7 and the conductor part 2a improves immediately after crimping.

In addition, although the temperature control part 60 demonstrated here with the structure which has the heating mechanism part 62 and the cooling mechanism part 72, you may be comprised only in either one.

Further, the heating mechanism 62 and the cooling mechanism 72 are not limited to the above configuration. Hereinafter, other forms of the heating mechanism unit 62 and the cooling mechanism unit 72 will be described. First, three examples of other forms of the heating mechanism 62 will be described.

The second heating mechanism 62a is configured to be able to heat the first lower mold 22 and to be able to heat the conductor crimping section 7 supported on the first lower mold 22 in a mounting manner. (See FIG. 7). The second heating mechanism unit 62a has the same configuration as the heating mechanism unit 62 described above, and includes a heat generating unit 64a, a temperature sensor 66a, and a heating control unit 68a. Then, based on the temperature information of the first lower mold 22 acquired by the temperature sensor 66a, the heating control unit 68a causes the heat generating part 64a to generate heat and heats the first lower mold 22. That is, when the conductor crimping portion 7 is supported on the first lower mold 22, the bottom portion 7a comes into contact with the first lower crimping surface 22a and the conductor crimping portion 7 is heated.

As the third heating mechanism part 62b, a configuration capable of heating the conductor crimping part 7 of the crimping terminal 5 fed to the terminal feeding mechanism part 50 can be adopted (see FIG. 8). The third heating mechanism section 62b has a heat generating section 64b, a temperature sensor 66b, and a heating control section 68b, similar to the above-described heating mechanism section 62, and the feeding table 54 of the terminal feeding mechanism section 50 as a whole. Or partially heated. More specifically, the two heat generating portions 64b are disposed so as to contact the feeding table 54, the temperature sensor 66b is attached, and the temperature information of the feeding table 54 acquired by the temperature sensor 66b is used. Thus, the heating control unit 68b generates heat in the heat generating unit 64b and heats the feeding table 54. Thereby, the conductor crimping | compression-bonding part 7 of the crimp terminal 5 is moved so that it may slide on the heated feed stand 54, and is heated until it moves to a crimping | compression-bonding position.

The feeding base 54 is preferably configured such that at least a portion of the plurality of chain-shaped crimping terminals 5 that comes into contact with the bottom 7a of each conductor crimping portion 7 is made of a material having good thermal conductivity and is heated. . As an example of partial heating, it is possible to employ a configuration in which a material having good heat conductivity is disposed in a band shape in a portion corresponding to the movement locus of the bottom portion 7a of the conductor crimping portion 7.

As the fourth heating mechanism portion 62c, a configuration in which the conductor crimping portion 7 is heated by condensing light and irradiating the conductor crimping portion 7 can be employed (see FIG. 9). More specifically, light is applied to the reflection plate 64c formed in the concave spherical surface, and the reflected light of the reflection plate 64c is applied to the conductor crimping portion 7 through the convex lens 66c disposed in front of the reflection plate 64c. Thus, the conductor crimping portion 7 can be heated. The fourth heating mechanism 62c may heat the conductor crimping portion 7 with respect to the crimping terminal 5 supported in a mounted manner on the lower mold 20, or on the upstream side of the crimping position. The conductor crimping part 7 may be heated with respect to the crimping terminal 5 fed by the terminal feeding mechanism part 50. Here, the light source for irradiating the reflecting plate 64c may be sunlight or a light emitting device. In FIG. 9, the optical path is schematically shown by a broken line.

In addition, the laser is applied to the conductor crimping portion 7 immediately before crimping (in a state where the crimping terminal 5 is supported on the lower mold 20 or is fed by the terminal feeding mechanism portion 50). A configuration in which heating is performed by irradiating light and a configuration in which heating is performed by jetting hot air can also be employed.

Next, another form of the cooling mechanism 72 will be described. As the 2nd cooling mechanism part 72a, the structure which sprays the cooled nitrogen N with respect to the conductor part 2a of the electric wire 2, and cools the conductor part 2a can be employ | adopted (refer FIG. 13). More specifically, the second cooling mechanism portion 72a blows liquid nitrogen or nitrogen N vaporized so as to reach a set temperature to the conductor portion 2a for a certain amount or for a certain time immediately before the pressure bonding, The conductor 2a may be cooled. In FIG. 13, the cooled nitrogen N to be injected is indicated by a broken line.

The other

heating mechanism units

62a, 62b, 62c and the cooling mechanism unit 72a can be provided in combination with the heating mechanism unit 62 and the cooling mechanism unit 72. For example, the

heating mechanism parts

62 and 62a are provided as the temperature adjusting part 60, and the conductor crimping part 7 is heated from the pair of conductor crimping pieces 7b side by the heating mechanism part 62 and heated from the bottom part 7a side by the heating mechanism part 62a. Thus, the temperature can be increased more reliably. Furthermore, as a preheating means in the feeding stage of the crimp terminal 5, a third heating mechanism 62b can be provided as an auxiliary. Also, the conductor crimping part 7 and the conductor part 2a can be provided by providing the

heating mechanism parts

62a, 62b, 62c or the cooling mechanism part 72a alone instead of the first heating mechanism part 62 or the first cooling mechanism part 72. The effect of generating a temperature difference between the two can be obtained.

<4. Operation of terminal crimping device>
Next, the terminal crimping operation by the terminal crimping apparatus 10 having the above configuration will be described.

In the following description, as an initial state, a plurality of chain-like crimp terminals 5 are set on the feeding base 54 of the terminal feeding mechanism section 50, and the electric wire 2 that has been cut and peeled is held by the electric wire holding section 40. It is assumed that Further, the upper mold 30 is stopped at a position separated from the lower mold 20 by the drive mechanism unit 38 (see FIG. 5).

First, the terminal feed mechanism unit 50 feeds a plurality of chain-like crimp terminals 5 in the feed direction P by one pitch. More specifically, one crimp terminal 5 is hooked by the feed claw member 52 and the entire chain-like crimp terminals 5 are fed by one pitch in the feed direction P. As a result, the crimping terminal 5 on the crimping position side among the plurality of crimping terminals 5 is supported by the conductor crimping portion 7 on the first lower crimping surface 22a of the first lower mold 22 while being covered. The crimping portion 8 is disposed between the lower die 20 and the upper die 30 at a position where the crimping portion 8 is supported on the second lower crimping surface 24a of the second lower die 24 (FIG. 5). reference).

When the crimping terminal 5 is supported on the lower mold 20 so as to be placed, the electric wire 2 is moved to the crimping position side by the electric wire holding portion 40. Immediately before being disposed at the crimping position, the conductor portion 2a is cooled by the cooling mechanism portion 72 of the electric wire 2 held by the electric wire holding portion 40 (see FIG. 11). More specifically, the electric wire 2 is inserted into the conductor accommodation hole 73 through the opening by the electric wire holding portion 40. At this time, the rubber packing 75 is brought into close contact with the outer peripheral portion of the front end portion of the covering portion 2 b to close the opening, and the conductor portion 2 a is disposed on the back side from the rubber packing 75. In this state, the cooled nitrogen N is supplied into the conductor housing hole 73 through the supply pipe 77 by the nitrogen supply unit 76. The cooled nitrogen N supplied into the conductor housing hole 73 flows in the conductor housing hole 73 in the longitudinal direction toward the back side and is discharged from the nitrogen discharge portion 78. When the cooled nitrogen N is supplied for a set time or a set amount, the nitrogen supply unit 76 stops supplying the cooled nitrogen N, and the electric wire 2 is extracted from the conductor housing hole 73 by the electric wire holding unit 40. . As a result, the conductor portion 2a is cooled to about −50 ° C.

Immediately after the cooling of the conductor part 2a, the electric wire 2 is placed between the pair of conductor crimping pieces 7b of the conductor crimping part 7 and the tip of the covering part 2b is covered with the crimping part by the electric wire holding part 40. It moves to the position arrange | positioned between a pair of 8 covering crimping | compression-bonding pieces 8b (refer FIG. 5). At this time, the conductor portion 2 a is maintained at a position where it does not contact the conductor crimping portion 7.

After the crimp terminal 5 and the electric wire 2 are set, the upper mold 30 is moved close to the lower mold 20 by the drive mechanism 38 (see FIG. 14).

The first upper mold 32 heated by the heating mechanism 62 heats the conductor crimping portion 7 from a position (see FIG. 15) in contact with the pair of conductor crimping pieces 7b. Moreover, the drive mechanism part 38 reduces the speed which descends the upper metal mold | die 30 from the position where the 1st upper metal mold | die 32 contacted a pair of conductor crimping piece 7b. The first lower mold 32 contacts the pair of conductor crimping pieces 7b at a reduced speed to heat the conductor crimping portion 7, while the pair of conductor crimping pieces 7b are arranged along the first upper crimping surface 32a. And it is made to deform toward the bottom 7a side. Then, the low speed driving is terminated at the position immediately before the conductor portion 2a is compressed and deformed (see FIG. 16), and the driving is performed at the normal speed. In the state where the low-speed driving is finished, the conductor crimping portion 7 is heated to about 150 ° C. When the first upper mold 32 is further moved downward at a normal speed, the pair of conductor crimping pieces 7b are further deformed inward and on the bottom 7a side, and the conductor portion 2a is compressed and deformed. Finally, the conductor crimping portion 7 is electrically and mechanically crimped and connected to the conductor portion 2a in a state where the first upper mold 32 is moved down to the crimping bottom dead center (see FIG. 17). The crimped conductor crimping part 7 is configured such that the pair of conductor crimping pieces 7b are deformed in a curved shape toward the inside and the bottom part 7a, and surround the conductor part 2a that has been compressed and deformed.

Further, the second upper mold 34 is lowered by the drive mechanism unit 38 integrally with the first upper mold 32, and deforms the pair of coated crimping pieces 8b inward and toward the bottom 8a side. Thereby, the crimping | compression-bonding part 8 is crimped and connected mechanically to the front-end | tip part of the coating | coated part 2b.

Furthermore, the crimp terminal 5 supported in a mounted manner on the lower mold 20 is separated from the connecting portion 9 connecting the plurality of crimp terminals 5 (not shown).

The drive mechanism section 38 moves the upper mold 30 downward to the bottom dead center, and then immediately moves the upper mold 30 back to the initial position (see FIG. 18). Then, the electric wire 2 to which the crimp terminal 5 is crimped may be moved to the product discharge position while being held by the electric wire holding portion 40 and transferred to a tray or the like that accommodates the finished product.

After completion of the crimping, the conductor crimping portion 7 of the crimping terminal 5 is contracted and deformed in a direction in which the conductor crimping portion 7 comes into close contact with the conductor portion 2a while gradually decreasing in temperature. Moreover, the conductor part 2a of the electric wire 2 expands and deforms in a direction in which the conductor part 2a is in close contact with the conductor crimping part 7 while gradually rising to room temperature (see FIG. 19). Thereby, the contact force obtained from the high residual stress between the conductor part 2a and the conductor crimping part 7 after crimping as compared with the case where crimping is performed with the same crimp height by the terminal crimping apparatus without the temperature adjusting part 60. And the contact resistance can be reduced.

By the above operation, the crimp terminal 5 is crimped to the electric wire 2 (see FIG. 2). And the next crimping terminal 5 is crimped | bonded to the electric wire 2 like the said operation | movement, and an electric wire with a crimping terminal can be manufactured continuously by repeating this operation | movement.

According to the terminal crimping apparatus 10 configured as described above, the temperature adjusting unit 60 and the conductor part 2a and the conductor are arranged so that the temperature of the conductor crimping part 7 is relatively higher than that of the conductor part 2a at least when the crimping is completed. A temperature difference is generated between the crimping portions 7. More specifically, the conductor crimping portion 7 is heated by the heating mechanism 62, and the conductor crimping portion 7 that has been heated and expanded contracts as it returns to room temperature after crimping. In addition, the conductor portion 2a is cooled by the cooling mechanism portion 72, and the conductor portion 2a that has been cooled and contracted expands as the temperature returns to room temperature after pressure bonding. That is, when the conductor crimping part 7 crimped so as to cover the outer peripheral part of the conductor part 2a is contracted and deformed, a force acts in a direction in close contact with the conductor part 2a, and the conductor part 2a is expanded and deformed. A force acts in a direction in close contact with the conductor crimping portion 7. As a result, the tensile strength is ensured as compared with the case where crimping is performed with the same crimp height so as to keep the cross-sectional area of the conductor part 2a the same without providing a temperature difference between the conductor crimping part 7 and the conductor part 2a. However, the contact force obtained from the residual stress can be improved so as to reduce the contact resistance acting between the conductor portion 2a and the conductor crimping portion 7. That is, the tensile strength and the contact resistance can be compatible with high performance.

Further, the heating mechanism 62 of the temperature adjusting unit 60 is set so that the upper limit temperature of heating is such that tin plating applied to the crimp terminal 5 does not soften. The deformation of the tin plating at the time of deformation accompanying the temperature change of the conductor portion 2a can be suppressed, and the contact force obtained from the residual stress can be obtained stably when the temperature of the crimp terminal 5 drops to room temperature. And thereby, the contact resistance between the conductor crimping | compression-bonding part 7 and the conductor part 2a can be made small.

Then, the heating mechanism 62 heats the first upper mold 32, and the first upper mold 32 comes into contact with the conductor crimping section 7 supported on the first lower mold 22 so as to be mounted thereon, thereby crimping the conductor. Due to the configuration in which the portion 7 is heated, the conductor crimping portion 7 is heated from the contact position of the first upper mold 32 to the conductor crimping portion 7 during the crimping. That is, since the conductor crimping portion 7 is heated in a period during which the conductor crimping portion 7 is crimped and deformed, the heat of the heated conductor crimping portion 7 can be prevented from being conducted to the conductor portion 2a, and the temperature difference between the conductor crimping portion 7 and the conductor portion 2a can be reduced. Can be maintained to the maximum. Further, since the first upper crimping surface 32a of the first upper mold 32 heats with a relatively large contact surface with respect to the conductor crimping portion 7 (the pair of conductor crimping pieces 7b), the temperature can be raised more efficiently. it can. Thereby, a temperature difference can be generated between the conductor part 2a and the conductor crimping part 7 more reliably, and the contact force obtained from the residual stress can be improved and the contact resistance can be reduced.

Moreover, in the structure which the heating mechanism part 62 heats the 1st lower metal mold | die 22, since it is comprised so that the conductor crimping | compression-bonding part 7 supported by the mounting shape on the 1st lower metal mold 22 may be heated, The conductor crimping part 7 can be heated during a relatively long period in which the crimping terminal 5 is supported in a mounted form. As a result, it is possible to suppress the temperature of the conductor crimping portion 7 from decreasing before the completion of crimping after heating, and a temperature difference can be stably generated between the conductor portion 2a and the conductor crimping portion 7, which is obtained from the residual stress. The contact force can be improved and the contact resistance can be reduced.

In the configuration in which the heating mechanism unit 62 heats the conductor crimping part 7 of the crimp terminal 5 fed to the terminal feeding mechanism part 50, the conductor crimping part 7 is placed on the first lower mold 22. The conductor crimping portion 7 can be heated for a relatively long period until it is conveyed to a position supported in a shape. Thereby, a temperature difference can be stably generated between the conductor part 2a and the conductor crimping part 7, and the contact force obtained from the residual stress can be improved and the contact resistance can be reduced.

In addition, the cooling mechanism 72 of the temperature adjusting unit 60 is cooled in a temperature range in which the covering portion 2b covered with the conductor portion 2a is not cooled to the embrittlement temperature as the conductor portion 2a is cooled. The brittle fracture of the portion 2b can be suppressed, the contact force obtained from the residual stress can be improved, and the contact resistance can be reduced.

And since the cooling mechanism part 72 is comprised so that the cooled nitrogen N may flow in the conductor accommodating hole part 73 along the longitudinal direction of the conductor part 2a accommodated in the conductor accommodating hole part 73, The conductor part 2a can be cooled more reliably. Thereby, a temperature difference can be stably generated between the conductor part 2a and the conductor crimping part 7, and the contact force obtained from the residual stress can be improved and the contact resistance can be reduced.

Also, in the case of crimping a crimp terminal having a cylindrical conductor crimp part, the conductor crimp part 7 of the electric wire 2 is cooled by the

cooling mechanism parts

72, 72a and the conductor crimp part 7 is fixed by the

heating mechanism parts

62b, 62c. It is recommended to perform pressure bonding after heating. For example, such crimping terminals are crimped with the conductor part 2a inserted into the conductor crimping part, with the crimping dies disposed in the four circumferential directions of the conductor crimping part directed toward the central axis of the conductor crimping part. The conductor crimping portion can be caulked by moving it close to each other. Thereby, after crimping, the conductor portion 2a expands and deforms as it returns to room temperature, and the conductor crimp portion contracts and deforms as it returns to room temperature, and contact obtained from the residual stress between the conductor portion 2a and the conductor crimp portion 7 The contact resistance can be reduced by improving the force.

As mentioned above, although the manufacturing method of this terminal crimping electric wire, the terminal crimping electric wire 1, and the terminal crimping apparatus 10 were demonstrated in detail, above-described description is an illustration in all the phases, Comprising: This invention is limited to it. It is not a thing. It is understood that countless variations that are not illustrated can be envisaged without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Terminal crimping electric wire 2 Electric wire 2a Conductor part 5 Crimp terminal 7 Conductor crimping part 10 Terminal crimping apparatus 22 1st lower metal mold 32 1st upper metal mold 50 Terminal feeding mechanism part 60 Temperature control part 62 1st heating mechanism part 62a 2nd heating mechanism part 62b 3rd heating mechanism part 72 1st cooling mechanism part 73 Conductor accommodation hole part 76 Nitrogen supply part 78 Nitrogen discharge part

Claims

The conductor crimping part of the crimped crimped terminal is a method of manufacturing a terminal crimping electric wire crimped to the conductor part exposed at the end of the electric wire,
(A) generating a temperature difference between the conductor part and the conductor crimping part so that the temperature of the conductor crimping part is relatively higher than the temperature of the conductor part;
(B) crimping the conductor crimping part to the conductor part;
The manufacturing method of the terminal crimping electric wire provided with.
It is a manufacturing method of the terminal crimping electric wire according to claim 1,
The said process (a) is a manufacturing method of the terminal crimping electric wire which has the process (a1) which heats the said conductor crimping | compression-bonding part in the temperature range in which the plating of the said crimping terminal does not fuse | melt.
It is a manufacturing method of the terminal crimping electric wire according to claim 1,
The said process (a) is a manufacturing method of the terminal crimping electric wire which has the process (a2) which cools the said conductor part.
The conductor crimping part of the crimping terminal is a terminal crimping electric wire crimped to the conductor part exposed at the end of the electric wire,
In a state in which a temperature difference is applied between the conductor portion and the conductor crimping portion so that the temperature of the conductor crimping portion is relatively higher than the temperature of the conductor portion, Terminal crimping in which the conductor crimping part is crimped and connected to the conductor part in a state where the conductor crimping part is inflated and deformed or the conductor crimping part is contracted and deformed by crimping the conductor crimping part. Electrical wire.
A terminal crimping device for crimping a conductor crimping portion of a plated crimped terminal to a conductor exposed at an end of an electric wire,
A crimping die capable of crimping the conductor crimping portion to the conductor portion;
A temperature adjusting unit that generates a temperature difference between the conductor part and the conductor crimping part so that the temperature of the conductor crimping part is relatively higher than the temperature of the conductor part;
A terminal crimping device.
The terminal crimping device according to claim 5,
The said temperature control part is a terminal crimping | compression-bonding apparatus which has a heating-mechanism part which can heat the said conductor crimping | compression-bonding part in the temperature range which the plating of the said crimping terminal does not fuse | melt.
The terminal crimping device according to claim 6,
The crimping die is
A lower mold capable of supporting the conductor crimping portion in a mounting shape;
An upper part that is disposed so as to be movable toward and away from the lower mold and that is supported on the lower mold in a mounting manner, and can be crimped to the conductor part between the lower mold and the lower mold. Mold,
Have
The heating mechanism portion is configured to be able to heat the upper die, and the upper die is brought into contact with the conductor crimping portion supported in a mounted manner on the lower die. A terminal crimping apparatus having a heatable first heating mechanism.
The terminal crimping device according to claim 6,
Crimping mold is
A lower mold capable of supporting the conductor crimping portion in a mounting shape;
An upper part that is disposed so as to be movable toward and away from the lower mold and that is supported on the lower mold in a mounting manner, and can be crimped to the conductor part between the lower mold and the lower mold. Mold,
Have
The said heating mechanism part is comprised so that the said lower metal mold | die can be heated, The terminal crimping | compression-bonding apparatus which has a 2nd heating mechanism part which can heat the said conductor crimping | compression-bonding part supported by the mounting shape on the said lower metal mold | die.
The terminal crimping device according to claim 6,
A terminal feeding mechanism portion capable of feeding the crimp terminal to a crimping position for crimping the conductor crimp portion to the conductor portion;
The terminal crimping apparatus, wherein the heating mechanism section includes a third heating mechanism section capable of heating the conductor crimping section of the crimp terminal fed to the terminal feeding mechanism section.
The terminal crimping device according to claim 5,
The said temperature control part is a terminal crimping | compression-bonding apparatus which has a cooling mechanism part which can cool the said conductor part.
The terminal crimping device according to claim 10,
The cooling mechanism is
A body portion in which a conductor housing hole capable of housing the conductor portion of the electric wire is formed;
A nitrogen supply part for supplying cooled nitrogen into the conductor receiving hole part;
A nitrogen discharge part capable of discharging the cooled nitrogen supplied into the conductor receiving hole part from the conductor receiving hole part;
Have
The nitrogen supply part and the nitrogen discharge part of the cooling mechanism part cause the cooled nitrogen to flow in the conductor accommodation hole along the longitudinal direction of the conductor part accommodated in the conductor accommodation hole. A terminal crimping device configured as described above.