JP3426742B2 - Crimping structure of crimping terminal and wire and crimping tool - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to crimping of a crimp terminal and an electric wire.
Regarding structure and crimping tool , especially crimping terminal and wire crimping structure for fixing electric wire with high wire hardness and low toughness
And crimping tools .

[0002]

2. Description of the Related Art A crimp terminal is one in which a wire conductor is loosely inserted in a barrel, a mechanical compressive load is applied to the barrel portion to cause plastic deformation, and the plastic deformation causes crimping. It is a terminal that can be connected gas tightly, and there are various crimp terminals depending on the type of electric wire used, such as a twisted wire, a single wire, and a coaxial wire, and the size of the electric wire. FIG. 8: is sectional drawing of the mounting state of the conventional crimp terminal. In FIG. 8, the crimp terminal 10 has a barrel 12 and a terminal portion 13 electrically and mechanically coupled to each other.
The electric wire 9 is connected to the 2 side. Conventional crimp terminal 1
0, the electric wire 9 is attached to the barrel 12 by loosely inserting one end of the electric wire 9 into the opening 15 formed on the side of the barrel 12 that is not in contact with the terminal portion 13 and A mechanical load is applied at one crimping point 14 to plastically deform the one side surface of the barrel 12 inwardly, thereby eliminating a play space generated between the electric wire 9 and the inner surface of the barrel 12. It is performed by holding the electric wire 9 between the inner surfaces of 12 facing each other. Therefore, in the conventional crimp terminal, the electric wire is fixed to the crimp terminal by crimping only one crimp point.

[0003]

A conventional crimping structure is used.
However, there are the following problems. (1) When the conventional crimping structure is applied to a wire having a high wire hardness and a low toughness, there are problems in mechanical performance such as tensile strength and electrical performance such as conductivity. For example, in the case of heat insulation, evaporation loss, freezing, or internal fluid state change prevention, ease of temperature control, work safety, and efficiency improvement in parts such as gas pipe joints. There is a heater wire at a place where heat should be kept, and the heater wire is energized to heat the wire so that the heat is kept. In the installation of the heater wire on such a gas pipe joint, etc., a crimp terminal is used because of its gas tight characteristics.

However, since the heater wire has a property that the wire hardness is high and the toughness is low, the wire is hardly deformed as shown in FIG. 8 by the conventional point pressure bonding process from only one direction. However, since there is only one location for crimping, there is a problem in the tensile strength such as the electric wire pulling out, and there is also a problem in electrical performance such as a small contact area and high electrical resistance. .

(2) Generally, several types of crimping terminals having different inner diameters are prepared in advance, and the crimping terminals are appropriately selected and used according to the wire diameter of the electric wire to be connected. Even in processing, the crimp height is adjusted according to the wire diameter of the wire. Therefore, there is also a problem in workability in processing when the crimp terminal is attached, such as replacement work of the crimp terminal corresponding to the wire diameter of the electric wire to be connected or adjustment work of the crimp height.

Therefore, the present invention solves the above-mentioned problems in the conventional crimping structure , and crimps a crimping terminal and an electric wire having good mechanical and electrical performances in the crimping portion and the crimping structure and pressure.
The purpose is to provide a dressing tool .

Another object of the present invention is to provide a crimping terminal and an electric wire crimping structure and a crimping tool, which can be easily processed when attaching the crimping terminal .

[0008]

[Means for Solving the Problems] Crimp terminal and electric wire of the present invention
The crimping structure is that the barrel that crimps the wire to the other end of the terminal
Using the formed crimp terminal, insert it into the barrel through the opening
Play around the outer circumference of the
Insertion holes for insertion and crimping dies on both sides of the barrel
Crimping with the crimp tool
Plastic to bend and eliminate play space in the insertion hole
It is deformable and the stepped portion is curved in a convex shape to one side.
The second step to be made to protrude and the other step at both sides sandwiching the second step to the other
It is formed by the first and third steps that are curved like a circle
And

Further , in the crimping structure of the crimping terminal and the electric wire,
The terminal portion within the step portion that is curved in a convex shape to the other side.
Formed by reducing the protruding height of the third step close to
Can be taken.

The crimping terminal and the electric wire of the present invention are crimped.
The crimping tool presses one side surface of the crimping terminal to press the first
And the first crimping die forming the third step and the crimping terminal
Second pressure bonding for pressing the other side surface to form the second step portion
The dies are arranged so as to face each other, and the first pressure bonding die is
The first and third convex portions forming the first and third stepped portions are projected.
And the second concave portion between the first and third convex portions.
And the second step is formed on the second crimping die.
While protruding the second convex portion to be formed,
First and third recesses are formed on both sides, and the first and third recesses are formed.
The convex portion is opposed to the first and third concave portions, and the second convex portion
Is opposed to the second recess, and
The first protrusion has a higher protrusion height than the third protrusion and
Note that the third recess has a higher protruding height than the first recess.
Can be taken.

[0011]

[Operation] With the crimp structure of the crimp terminal and the electric wire according to the present invention
Indicates that the step is in the condition that the wire is loosely inserted in the insertion part.
The cable in a direction that intersects the insertion line and the centerline of the wire.
And bend in one direction and in the opposite direction.
Formed in the same direction and curved in one direction
On both sides of the step, opposite to the bending direction of the step.
Curved in the direction.

Also, the crimp height at the stepped portion of the crimp terminal
Is set by keeping the height of the step in the stepped portion constant.
It is possible to set a constant value that does not depend on the outer diameter of the wire to be worn.
, Especially in the step that bends convexly to the other side,
Formed by reducing the protruding height of the third step close to the terminal side
It is possible to reduce the amount of deformation of the step near the fitting part of
Wear.

Crimping of the crimp terminal and the electric wire according to the present invention
The crimping tool for
The first crimping die that presses against the barrel from both sides and
And the pressing surface of the second crimping die, the crimping type of the crimping terminal
Shaped stepped portion can be formed, and the stepped portion can be formed.
The stepped portion is the convex and concave portions of the first crimping die and the second crimping die.
Place the concave and convex parts of the chair facing each other, and connect the electric wire between the concave and convex parts.
It is formed by gripping the inserted barrel and compressing and deforming it.

The crimp height at the stepped portion of the crimp terminal
Is an electrode that is crimped with the height of the step at the stepped portion kept constant.
The first crimping die and the second crimping die should be independent of the outer diameter of the wire.
Projection height of concave and convex portions formed on the pressing surface of the crimping die
The height can be set to a certain level depending on the
The protrusion has a height higher than that of the third convex portion and the third concave portion.
Has a protruding height higher than that of the first recess, and fits on the terminal side.
It is possible to reduce the amount of deformation of the step portion on the side close to the portion.

[0015]

Embodiments of the present invention will now be described in detail with reference to the drawings, but the present invention is not limited to the embodiments. (Structure of Embodiment) FIG. 1 is a cross-sectional view of a crimp terminal of the present invention with an electric wire attached, and FIG. 2 is a perspective view of the crimp terminal of the present invention with an electric wire attached.

In FIGS. 1 and 2, the crimp terminal 1 is
Similar to the conventional crimp terminal 10 shown in FIG. 8, the barrel 2
And the terminal portion 3 are electrically and mechanically coupled to each other, and the electric wire 9 is connected to the barrel 2 side. The crimp shape of the crimp terminal 1 of the present invention is such that the electric wire 9 is loosely inserted into the opening 5 of the barrel 2 and the barrel 2 and the barrel 2
The electric wires 9 in the inside are curved together to form the barrel 2 and the electric wires 9.
The step portions 41, 42, and 43 are formed in the cross-sectional direction of the crimp terminal that intersects with the center line direction (length direction) of the step portion 4 by the step portions 41, 42, and 43.
It is what constitutes. The formation direction of this step is
The angle is not limited to the direction that traverses the barrel 2 and the electric wire 9, and may be any angle that intersects with the center line direction (length direction) of the barrel 2 and the electric wire 9.

Steps 41, 42, and 4 forming the step 4
Regarding the curving direction of the stepped portion 3, the stepped portion 41 and the stepped portion 43 are in the same direction, and the stepped portion 42 is formed in the opposite direction. 1 and 2, the step portions 41 and 43 are curved downward in the drawing, and the step portion 42 is curved upward in the drawing. Has a curved shape in the opposite direction. The crossing angle at which the step portions 41, 42, and 43 intersect with the center line direction of the barrel 2 and the electric wire 9 can be a right angle or an arbitrary angle.

Therefore, the step 4 is formed by intersecting the center line direction (length direction) of the barrel 2 and the electric wire 9 with the curving directions of adjacent step portions being alternately opposite to each other. It

The inner diameter of the opening 2 of the barrel 2 is at least larger than the outer diameter of the electric wire 9 to be connected, and the insertion hole is at least deeper than the insertion length of the electric wire 9 to be connected toward the terminal portion 3. 6 is formed.

Next, the crimping process of the crimp terminal of the embodiment and its working tool will be described with reference to FIGS. Figure 3
6 is a cross-sectional view of the crimp terminal before forming a crimp shape by the crimp processing of the present invention, and FIGS. 4 and 5 are cross-sectional views illustrating the relationship between the crimp terminal of the present invention and a processing tool, and FIG. FIG. 3 is a perspective view illustrating the relationship between the crimp terminal of the present invention and a processing tool.

In FIG. 3, the barrel 2 of the crimp terminal 1 before processing extends substantially linearly in the center line direction (length direction), and the opening 5 and the insertion hole 6 are opened at the center thereof. . The inner diameter of the opening 5 of the barrel 2 is formed larger than the outer diameter of the electric wire 9 for connection, and the depth of the insertion hole 6 of the barrel 2 is formed deeper than the length of the mounting portion of the electric wire 9, Can be loosely inserted into the insertion hole 6 through the opening 5 of the barrel 2 and inserted into the insertion hole 6 up to the attachment position of the electric wire 9. FIG. 3 simply shows a state in which the electric wire 9 is loosely inserted in the barrel 2, and there is a gap between the electric wire 9 and the inner peripheral surface of the barrel 2, and the electric wire 9 is not in a fixed state.

To attach the electric wire 9 to the barrel 2, one end of the electric wire 9 is loosely inserted into the opening 5 of the barrel 2 and a mechanical load is applied to the barrel 2 on both sides of the barrel 2 to apply a mechanical load.
Both sides of the wire are plastically deformed into a stepped shape, and the electric wire 9 and the barrel 2 are
By eliminating the space of play generated between the inner surface of the crimp terminal and the inner surface of the barrel 2 which holds the electric wire 9 and the electric wire 9 itself is plastically deformed into a stepped shape, the stepped crimped shape of the crimp terminal is formed. Is configured. Hereinafter, the crimping process of the crimp terminal of the present invention will be described.

4 to 6 show a crimping die for forming the crimping shape of the crimping terminal 1. The crimping die is a portion for directly processing the barrel 2 in the crimping tool for forming the crimping shape of the crimping terminal, and is composed of two opposing dies, a first crimping die 7 and a second crimping die 8. .

4 to 6, the first crimping die 7 is a crimping die arranged on the upper side in the drawings and has two convex portions, a first convex portion 71 and a second convex portion 72. . The first
The convex portion 71 and the second convex portion 72 form the fourth concave portion 70 and the second concave portion 7 that form the end surface of the base 79 of the first pressure bonding die 7.
It is formed so as to project from the surface 2 toward the crimp terminal 1 side. Further, in the embodiment shown in the drawing, the protruding height 75 of the first convex portion 71 is formed higher than the protruding height 76 of the third convex portion 73. Further, a cutout portion 74 is formed at the edge portion of the end portion of the first crimping die 7 on the terminal portion 3 side.

On the other hand, the second crimping die 8 is a crimping die arranged on the lower side in the drawing, and the second convex portion 82 is a convex portion.
have. The second convex portion 82 is formed so as to project toward the crimp terminal 1 side from the surfaces of the first concave portion 81 and the third concave portion 82 that form the end surface of the base 89 of the second crimping die 8. In the embodiment shown in the drawing, the second convex portion 82 is projected from the first concave portion 81 by the protrusion height 85, and the third concave portion 83 is formed higher than the first concave portion 81 by the surface height 87. Further, a cutout portion 84 is formed at an edge portion of the end portion of the second pressure bonding die 8 on the terminal portion 3 side.

The first crimping die 7 and the second crimping die 8 are arranged on both sides of the barrel 2 of the crimping terminal 1 with the barrel 2 interposed therebetween.
The barrel 2 and the electric wire 9 loosely inserted in the barrel 2 are sandwiched and pressed by a crimping tool that drives both crimping dies, and the barrel 9 and the electric wire 9 are movable in the opposite direction. Note that the configurations of the crimping tool and the drive device for driving the crimping tool are omitted because they are generally known.

Then, by arranging the first crimping die 7 and the second crimping die 8 so as to face each other, the first convex portion 71 and the third convex portion 73 of the first crimping die 7 are arranged in the second crimping die 8 of the second crimping die 8. The first concave portion 81 and the third concave portion 83 are opposed to each other, while the second convex portion 72 of the second pressure bonding die 8 is the first concave portion 81.
The position is arranged so as to face the second recess 72 of the pressure bonding die 7. By the combination of the convex portion and the concave portion facing each other, a crimp shape having a step portion of the crimp terminal is configured.

FIG. 5 shows the barrel 2 and the barrel 2 of the crimp terminal 1 by the first crimping die 7 and the second crimping die 8.
FIG. 6 is a sectional view showing a state in which the crimped shape having the step portion 4 of the crimp terminal 1 is formed by sandwiching and pressing the electric wire 9 loosely inserted therein, and FIG. 6 is a perspective view thereof. There is. In the positional relationship between the barrel 2 of the crimp terminal 1 and the electric wire 9 shown in FIG. 3, the first crimping die 7 and the second crimping die 8 are moved to sandwich the barrel 2 as shown in FIGS.
When the barrel 2 and the electric wire 9 in the barrel 2 are further moved in the compressing direction, they are curved and deformed by the convex portion and the concave portion of the crimping die to have the crimping shape shown in FIG.

Among the steps forming the crimp-shaped step portion 4 of the crimp terminal 1, the step 41 includes the fourth concave portion 70, the first convex portion 71, and the second concave portion 72 of the first crimping die 7. The barrel 2 is formed by the first concave portion 81 and the second convex portion 82 of the second crimping die 8, and the barrel 2 is located at the lower right in the figure due to the protruding height 75 between the fourth concave portion 70 and the first convex portion 71. Curved step 41
One of the inclined portions is formed, and the protruding height 75 between the second concave portion 72 and the first convex portion 71 is curved downward to the left in the figure to form the other inclined portion of the step portion 41. ing. In addition,
The electric wire 9 in the step portion 41 is pressed by the first concave portion 81 of the second crimping die 8 and is in a straight state. In addition, the stepped portion 42 includes the first convex portion 71 and the second convex portion 71 of the first pressure bonding die 7.
The concave portion 72 and the third convex portion 73 and the first concave portion 81, the second convex portion 82, and the third concave portion 83 of the second crimping die 8 are formed, and the barrel 2 and the electric wire 9 in the barrel 2 are the first. The protruding height 85 between the concave portion 81 and the second convex portion 82 is curved to the upper right in the figure to form one inclined portion of the step portion 42,
Further, the protrusion height 8 between the second convex portion 82 and the third concave portion 83 is 8
6 is curved to the lower right in the figure to form the other inclined portion of the step portion 42. Further, the step portion 43 includes the second concave portion 72, the third convex portion 73, and the cutout portion 7 of the first crimping die 7.
4 and the second convex portion 82 and the third concave portion 8 of the second pressure bonding die 8.
3, and the cutout portion 84, the barrel 2 and the electric wire 9 in the barrel 2 are curved to the lower right in the figure by the protrusion height 76 between the second concave portion 72 and the third convex portion 73. The one inclined portion of the step portion 43 is formed, and the other inclined portion of the step portion 43 is formed by being curved leftward and downward in the drawing due to the height difference between the third convex portion 73 and the cutout portion 74. There is.

As a result, the barrel 2 of the crimp terminal 1 and the electric wire 9 are formed by the step portion 4 including the step portions 41, 42 and 43.
The crimp shape of is constructed.

At the insertion position of the electric wire 9 in the barrel 2, the tip portion is at least the terminal portion 3 more than the step portion 43.
The position is on the side.

Next, another embodiment of the pressure bonding die will be described with reference to the perspective view of FIG. In FIG. 7, the crimping die is composed of two opposing dies, a first crimping die 17 and a second crimping die 18, similar to the crimping die of the first embodiment.

First crimping die 17 and second crimping die 8
Are formed in substantially the same shape as the pressure-bonding die of the first embodiment, and differ in the shapes of the first to fourth recesses on the end surfaces of the first pressure-bonding die 17 and the second pressure-bonding die 8 that face each other. . Therefore, only different shapes will be described, and description of other shapes will be omitted.

The first crimping die 17 of the second crimping die 18
The first convex portion to the third convex portion are formed on the end face opposite to the same as the pressure bonding die of the above-mentioned embodiment, and the difference from the above-mentioned embodiment is the shape of the first concave portion to the fourth concave portion. . In the concave portion of the first crimping die 17, a convex portion 171 is formed that is higher than the protruding height of the first convex portion and the third convex portion.
A groove 181 that is as low as the height of the first convex portion and the third convex portion is formed in the concave portion of the pressure bonding die 18. With this configuration, on both sides in the length direction of the end surface of the second crimping die,
The guide portion 182 and the guide portion 183 are formed so as to sandwich the groove 181. Guide part 182 and guide part 183
Guides the crimp terminal into the groove 181, and both side surfaces of the groove 181 support the guided crimp terminal by one side surface of the barrel. Therefore, the groove 181 and the guide portions 182, 1
According to 83, the crimp terminal can be aligned with the crimping die.

(Operation of Embodiment) By adopting the crimping shape having the step portion of the crimping terminal of the present invention, the electric wire 9 inserted into the barrel 2 of the crimping terminal 1 as well as the stepped deformation of the barrel 2 itself. A step-like deformation is performed, and the electric wire 9 and the barrel 2 are joined by the engagement due to the step-like shape. In the conventional crimp terminal, the electric wire 9 and the barrel 2 are joined to each other by a small frictional resistance due to the contact between the electric wire 9 and the barrel 2 because the electric wire 9 is substantially straight without deformation due to the crimping process. Since the joining at the crimp terminal is performed by the step-like deformation, the strand itself is caught by the barrel, the degree of the joining is increased, the tensile strength is increased, and the mechanical performance is improved.

Further, in the crimp terminal of the present invention, the crimping process is performed on a plurality of steps forming the step, and the electric wire and the inner peripheral surface of the barrel are more strongly contacted at the steps. Therefore, the electrical contact between the wire and the barrel is also good at this step. In the crimp terminal of the present invention, the number of the stepped portions is larger than that of the conventional crimp terminal, and the crimping process by the stepped portion is compared with the crimping process by the conventional point, and the contact at the processed portion is increased. Since the area is large, the electric resistance can be kept small,
The electrical performance is improved.

In crimping the crimp terminal, the inner diameter of the barrel of the crimp terminal of the present invention is not affected by the outer diameter of the wire to be connected and is at least smaller than the inner diameter of the barrel so that the barrel can be inserted into the barrel. With this wire, one type of crimp terminal can be crimped to a wire having an arbitrary outer diameter. This is because the crimp shape of the crimp terminal of the present invention is
This is achieved by a structural feature in which the barrel and the line in the barrel are deformed into a step shape from both sides. For example, when connecting a crimp terminal to the heater wire, conventionally,
3 different inner diameters for 7 types of heater wires with different diameters
Although it was necessary to prepare various types of crimp terminals, according to the crimp terminal of the present invention, one type of crimp terminal having an inner diameter into which the heater wire having the largest diameter of the seven types of heater wires can be inserted is used. be able to. Further, since this crimping process is performed, the crimping tool and the crimping die can be of one type for wires having different diameters.

Further, in crimping the crimp terminal,
The crimp height is closely related to the electrical and mechanical characteristics of the crimp terminal, and in the conventional crimp terminal, it is necessary to adjust the crimp height according to the diameter of the wire connected to the crimp terminal.
On the other hand, in the crimp terminal of the present invention, the barrel and the wire in the barrel are crimped in such a manner that the barrel and the wire in the barrel are deformed from both sides in a stepped shape. By making the height of the step constant, the step can be made a constant value that does not depend on the outer diameter of the crimped linear member, so that the crimp height need not be adjusted. In addition, in the crimping tool of the present invention, this crimping height can be set to a constant height by the protrusion height of the concave portion and the convex portion formed on the pressing surfaces of the first crimping die and the second crimping die. it can.

(Effects of the Embodiment) In the conventional point crimping in which only the central portion of the crimping portion of the crimping terminal is deformed, the tensile strength varies due to the nonuniformity of the crimping load caused by the displacement of the connecting wire with respect to the crimping terminal. However, in the embodiment of the present invention, by crimping the entire surface of the crimp terminal in the cross-sectional direction of the crimp terminal or in an arbitrary intersecting direction, the displacement of the crimp terminal is eliminated and the crimp load is made uniform. The problem of variation in tensile strength can be solved.

Further, among the plurality of step portions forming the step portion forming the crimped shape, the step portion on the side closer to the fitting portion on the terminal side (in the embodiment, for example, the third convex portion 73) Is the height of the convex portion forming the step (for example, the protrusion height 7
By reducing 6), it is possible to reduce the amount of deformation and reduce damage in the thrust direction to the crimp terminal due to crimping.

(Modification) In the above embodiment, the crimping process is performed.
Press the crimping die of the tool against the crimping terminal from above and below.
Work is done, but the compression direction should be arbitrary
You can

[0042]

EFFECTS OF THE INVENTION According to the crimping structure of the crimping terminal and the electric wire of the present invention.
Results in good mechanical and electrical performance at the crimp
Connection is easily achieved, and the barrel of the crimp terminal is
The inner diameter is not affected by the outer diameter of the connecting wire, and at least
Outside smaller than the inner diameter of the barrel so that it can be inserted into the barrel
For electric wires of diameter size,
Can be crimped using one type of crimp terminal
It In addition, the crimp height at the step of the crimp terminal is
It is crimped by keeping the height of the steps in
It can be a constant value that does not depend on the outer diameter of the wire.
Therefore, it is not necessary to adjust the crimp height. Also, convex to one side
The second step to be curved and the other at both side positions sandwiching the second step
The first and third steps that are curved in a convex shape
Crimping by performing crimping on the entire surface in the intersecting direction
Eliminates positional displacement with respect to the terminals and makes the crimping load uniform,
It is possible to solve the problem of variations in tensile strength.
It In particular, reduce the protruding height of the third step near the terminal
Formed by reducing the amount of deformation
It is possible to reduce damage in the thrust direction to the crimp terminals due to
You can

According to the crimping terminal and the crimping tool for electric wire of the present invention,
Then, the crimp height at the step of the crimp terminal is
An electric wire that is crimped by making the height of the opening step constant
Since it can be a constant value that does not depend on the outer diameter of
It is not necessary to adjust the wearing height and is suitable for electric wires with different diameters.
Then, crimping can be done with one type of crimping tool.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a crimp terminal of the present invention with an electric wire attached.

FIG. 2 is a perspective view of the crimp terminal of the present invention with an electric wire attached.

FIG. 3 is a cross-sectional view of the crimp terminal of the present invention before attaching an electric wire.

FIG. 4 is a cross-sectional view illustrating the relationship between the crimp terminal of the present invention and a processing tool.

FIG. 5 is a perspective view illustrating the relationship between the crimp terminal of the present invention and a processing tool.

FIG. 6 is a perspective view illustrating the relationship between the crimp terminal of the present invention and a processing tool.

FIG. 7 is a perspective view of another embodiment of the crimping die of the present invention.

FIG. 8 is a cross-sectional view of a conventional crimp terminal.

[Explanation of symbols]

1 Crimp terminal 2 barrels 3 terminals 4 step 5 openings 6 insertion holes 7,8 Crimping die 9 electric wires 41, 42, 43 steps 71, 73, 81 convex part 70, 72, 81, 83 recess

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masayoshi Anzaka 580-2 32 Takuji Nagaura, Sodegaura, Chiba Prefecture Mitsui Petrochemical Industry Co., Ltd. (56) References JP-A-62-68465 (JP, A) Kai 48-37736 (JP, A) JP-A 5-242944 (JP, A) Actual Kai 2-53045 (JP, U) JP-B 46-8914 (JP, B1) JP-B 38-6135 ( JP, B1) JP-B 7-87858 (JP, B2) JK-S9-4032 (JP, Y1) (58) Fields investigated (Int.Cl. ⁷ , DB name) H01R 4/18 H01R 43/042 -43/048

Claims (2)

(57) [Claims] 1. A crimp terminal in which a barrel for crimping an electric wire is formed at the other end of the terminal portion, and the barrel is provided with a play in a state in which there is a gap in the inner peripheral surface with respect to the outer circumference of the electric wire inserted from the opening. Insertion hole for insertion is provided, and crimping is performed with a crimping tool in which crimping dies are arranged on both sides of the barrel, and the barrel and the electric wire can be plastically deformed so as to eliminate play space in the insertion hole by curving in a step shape, the step portion is formed by the first and third step portion for bending a second step, the other to a convex shape at positions on both sides sandwiching the second step portion to be curved in a convex shape to one, the other
3rd step near the terminal in the step that is curved in a convex shape
A crimp structure for crimp terminals and electric wires, which is formed by reducing the protruding height of the . 2. A first crimping die that presses one side surface of a crimp terminal to form the first and third step portions, and another side surface of the crimp terminal is pressed to form the second step portion. Second
The pressure bonding dies are arranged so as to face each other, and the first and third protrusions forming the first and third stepped portions are projected from the first pressure bonding die, and the first and third protrusions are formed. Second between
A concave portion is formed, and a second convex portion forming the second step portion is protruded from the second crimping die, and first and third concave portions are formed on both sides of the second convex portion. 1st and 3rd convex part is made to oppose said 1st and 3rd recessed part, and said 2nd
The convex portion is opposed to the second concave portion, and the first convex portion is the third convex portion.
The protrusion height is higher than that of the first portion, and the third recess is the first
The crimping tool for crimping a crimp terminal and an electric wire according to claim 1, wherein the crimping tool is formed to have a height higher than that of the recess .