JPH04123780A - Crimping method of crimp-type terminal to wire and crimp structure - Google Patents

Abstract

PURPOSE:To reduce the sorts of crimp terminals by forming the forward end of a crim holding arm almost in parallel to a shaft of a crimp-type terminal, and providing a taper at a tightening groove for crimping. CONSTITUTION:A tightening groove 12 for an anvil 11 to advance and retract is formed from a lower end of a crimper 10 up, the tightening groove 12 is expanded at the forward end part (lower end part) to be a guide part for facilitating positioning, it is curved up to get gradually narrower, an upper bottom part is formed like a semi-circular are to be focused at the center from the right and left, and a sharp protrusion 13 having a sharp blade-like forward end is formed axially to a crimp-type terminal (axially to a wire) at a focused part. This protrusion 13 gets into between crimp holding arms 2a on both sides at the time of crimping, so the forward end of the crimp holding arms 2a bite a conductor 4a, and thereby contact secureness can be achieved.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to crimping between a crimp terminal and an electric wire, and particularly relates to a technique for improving both the electrical properties and mechanical properties of a crimp connection. .

[Conventional technology]

Crimp terminals are used in a wide range of applications because electrical connections can be made by simply inserting the conductor of a mating wire into the conductor crimping portion and crimping, and the connection work is simple.

A normal crimp terminal has a shape as shown by the symbol A in FIG.
, a conductor crimping part 2 connected to the contact part 1, and a covering crimping part 3 connected to the conductor crimping part 2, and are formed in a state in which they are connected to each other.

Both the conductor crimping part 2 and the covering crimping part 3 are crimping clamping arms 2a formed so as to face each other by bending both ends of a plate-like body connected to the contact part 1 upward in the figure.

3a, with a U-shaped cross section, and a space for accommodating the conductor 4a, which is the core wire of the electric wire 4, and a space for accommodating the electric wire 4 covered with the insulation coating 4b, respectively, are formed inside. ing.

The crimp terminal A configured as described above is connected to the electric wire 4 from which the insulation coating of the terminal part has been stripped off, but at this time, the conductor 4a is placed on the conductor crimping part 2 with the insulation coating 4b intact. After the part is placed on the covering crimping part 3,
It is crimped by the clamping force of the upper and lower crimp dies 6 and 7 in the crimping device, and is plastically deformed to electrically connect crimp terminal A and electric wire B as shown in FIG.

Figure 9 is a front view of the crimp terminal after crimping. C/Top (IIIn) shown in the figure is the crimping height, and if the wire size is the same, the smaller C/Top is, the greater the plastic deformation. shows.

Figure 10 is a diagram showing the relationship between the crimp height (C/top) and the mechanical and electrical properties of the crimp part, where ■ is the electrical property of the crimp part (resistance value mΩ), ■ indicates the mechanical properties (crimping strength in kg) of the terminal crimping part.

From the above diagram, the electrical characteristics are in the range of 1 (1,
It can be seen that a range of 55 to 1.85 mm) is good. On the other hand, the mechanical properties are C/C in the range of ■.
1.95 to 2.25), which is a good value. Therefore, with conventional crimping methods, it has not been possible to crimp so that both mechanical properties and electrical properties are in good condition.

Therefore, as a solution to this problem, a technique described in Japanese Patent Application Laid-open No. 165390/1983, shown in FIGS. 11 to 3, has been proposed. According to this, the crimp terminal A' is
As shown in FIG. 11, the crimping clamping arm 2b of the conductor crimping part is formed to be tapered with respect to the axis of the terminal (in the length direction of the electric wire). On the other hand, although not shown in the drawings, the crimping groove of the upper crimping mold is provided with a taper in the same direction. After that, crimping is performed in the same manner as described above, and the crimping height (C
/Top) on the C-C cross section on the left side of the crimp part, and lower the D on the right side.
-D cross section, the crimp height is set higher than the crimp height of the crimp terminal A' axis (
The conductor 4a is configured to change along the length direction of the conductor 4a.

By crimping as described above, the electrical properties can be mainly improved on the tip side of the wire conductor, and the mechanical properties on the opposite side can be improved, and the electrical properties and mechanical properties of the conductor crimped part 2 as a whole can be improved. It is possible to improve both. Additionally, the permissible range of crimping height has also been expanded compared to conventional products.

Here, what should be noted is that the depth of the crimp clamping arm 2b biting into the conductor 4a after crimping is C-C as shown in FIG.
If the cross section is hl and the D-D cross section is h2, the crimp clamping arm 2
Since the height of b is tapered, the crimp height H1yH
Regardless of the difference between the two, h1 is h2.

[Problem to be solved by the invention]

However, the above conventional technology has the following problems. That is, when the conductor 4a to be crimped is thick, as shown in FIG.
The depth of penetration approaches 0 almost simultaneously in both the CC cross section and the D-D cross section, resulting in rapid deterioration of mechanical properties and electrical properties. Furthermore, in order to ensure a suitable amount of biting depth at the tip of the crimping clamping arm 2b, the permissible range of the crimping height cannot be widened very much.

Therefore, one type of crimp terminal can only crimp an electric wire of size ■, and a crimp terminal of the same type as the size of the electric wire is required, resulting in a lack of versatility of the crimp terminal.

The present invention has been made with attention to the above facts, and it is possible to improve both the mechanical properties and electrical properties of the crimped part, and at the same time, expand the permissible range of crimped height, and can also be used for wires of multiple sizes. The purpose is to provide a crimp terminal that can be used for general purposes.

[Means to solve the problem]

In order to achieve the above-mentioned object, the present invention places a conductor of an electric wire on a conductor crimping part formed in a U-shape by opposing crimping clamping arms, and crimps the conductor between the crimping grooves of a pair of crimping molds. In a method of crimping a crimp terminal and an electric wire, the tip of the crimp holding arm is formed substantially parallel to the axis of the crimp terminal, and the crimp groove is tapered and crimped.
A configuration is adopted in which the crimping height of the conductor crimping portion and the depth of bite of the tip of the crimping clamping arm into the conductor are gradually changed along the length direction of the conductor.

In addition, as a connection structure between a crimp terminal and an electric wire, there is a crimp structure between a crimp terminal and an electric wire, in which the conductor of the electric wire is placed and crimped on a conductor crimping part formed in a U-shape by opposing crimp clamping arms. , the crimping height of the conductor crimping portion and the depth of penetration of the tip of the crimping clamping arm into the conductor are gradually varied along the length direction of the conductor.

[Function] When a conductor of a wire is placed on the wire crimping part and crimped with a crimping die, the crimping groove of the crimping die has a slope, so the crimping height (C/H) is in the axial direction of the wire conductor. , and the amount by which the tip of the crimp arm bites into the wire also changes. In other words, this amount of bite increases on the side where the crimp height is small and decreases on the side where the crimp height is large, so the amount of bite is averaged and one crimp terminal can be used to crimp multiple sizes of wires. Even when used, an appropriate amount of penetration depth can be ensured.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

1 and 2 show an embodiment of a crimping device used in the present invention. The crimping device is the "crimper" below the crimping upper mold C.
) 10 and the lower crimp mold (hereinafter referred to as "anvil")
The crimper 10 and the anvil 11 are moved relatively toward and away from each other by a drive device (not shown), and the crimper 10 and the anvil 11 are placed on the anvil 11. This is a crimp connection between the two.

From the lower end of the crimper 10, a crimping groove 12 for moving the anvil 11 forward and backward is formed upward in the figure. It is a wide guide section that curves upwards and gradually narrows, and the upper base draws an almost semicircular arc from left and right and converges at the center.
A protrusion 13 having a blade-like tip is formed along the axial direction of the crimp terminal (the axial direction of the electric wire). This protrusion 13 is
During crimping, it enters between the crimping clamping arms 2a on both sides, and the crimping clamping arms 2
This is to make the tip of the conductor 4a bite into the conductor 4a to ensure reliable contact.

The upper bottom portion of the crimping groove 12 is tapered along the axial direction of the crimp terminal, as shown in FIGS. 1 and 2.

FIG. 3 shows a crimp terminal A used in the present invention, and unlike the conventional example shown in FIG. This is the same as that shown in the conventional example.

An electric wire is inserted into the crimp terminal A in the same manner as described in the conventional example, placed on the anvil 11 shown in FIG. 1, and crimped by bringing the crimper 10 close. FIG. 4 is a perspective view after crimping, and FIG. 5 is a view from F in FIG. 4. The crimping height is from Hl on the left side of the conductor crimping part 2 to crimping height Hl on the right side.
It has a taper that gradually increases towards the end.

FIG. 6 shows the c'-c' cross section of the conductor crimping part 2 and the D'-D cross section.
' The cross-sections show a state in which the amount by which the tip of the crimp clamping arm 2a bites into the conductor 4a is different.

Since the axial height of the crimp clamping arm 2a is almost the same on the left and right sides of the figure as shown in FIG. 3, the amount of bite h1 on the tip side is
and the proximal side bite amount h2, hl > hl
The relationship holds true.

Then, Hl is within the range where the electrical characteristics are good (Hs
= 1.55 to 1.95 mm), and Hl is within the range where the mechanical properties are good (H2 = 1.85 to 2625 mm).
+), as long as the tip of the crimp holding arm 2a does not come into contact with the bottom of the conductor crimp part 2, both the electrical and mechanical properties of the conductor crimp part as a whole will be almost good, so the crimp height The allowable range can be greatly expanded.

In addition, even if the conductor size of the wire becomes thicker, as long as H1H2 is within the above-mentioned favorable ranges, even if hl approaches 0, hi will be maintained at a considerable depth, so the crimp connection There is no need to worry about deterioration of the electrical and mechanical properties of wires, and the same type of crimp terminal can be used for wires of multiple sizes.

〔Effect of the invention〕

As explained above, according to the present invention, the range of appropriate crimp height (C/H) in crimp terminals has been greatly expanded, and at the same time, the crimp height has become easier to manage.

Furthermore, conventionally, one crimp terminal could only be used for one type of wire size, but according to the crimp of the present invention, one type of crimp terminal can be used for multiple types of wire sizes. This increases the versatility of crimp terminals. Therefore, it is possible to reduce the number of types of crimp terminals, and it is possible to reduce inventory and make management easier, which is a special effect.

[Brief explanation of drawings]

Fig. 1 is a front view showing the main parts of the crimping device of the present invention, Fig. 2 is a sectional view taken along line E-E in Fig. 1, Fig. 3 is a perspective view of the crimp terminal used in the present invention, and Fig. 4 is a A perspective view of a crimp terminal after being crimped by the crimping method of the present invention, FIG. 5 is a view from F in FIG. is a sectional view taken along line D'-D' in Fig. 5, Fig. 7 is a perspective view showing the conventional crimping method, Fig. 8 is a perspective view of the crimp terminal after crimping by the conventional crimping method, and Fig. 9 is the Fig. 8 is a view from B in Fig. 8, Fig. 10 is a diagram showing the relationship between the crimp height (C/H), resistance value, and crimp part strength of a crimp terminal, and Fig. 11 is a perspective view of another conventional crimp terminal. Figure 12 is a front view showing the crimp terminal in Figure 11 after crimping, Figure 13 (a) is a sectional view taken along line CC in Figure 12, and (b) is a sectional view taken along line DD in Figure 12. , FIGS. 14(a) and 14(b) correspond to FIGS. 13(a) and 13(b) when the conductor of the electric wire is thick. A... Crimp terminal, ■... Connection part, 2... Conductor crimping part, 2a... Crimp clamping arm, 3... Covering crimping part, 4...
...Wire, 4a...Conductor, 4b...Insulation coating, IO
... Upper crimping mold, 11... Lower crimping mold, 12...
Caulking groove, Hl, H2...Crimp height, hl, h2...
The depth of bite at the tip of the crimp arm. Fig. Fig. n Fig. 4 Fig. Fig. (al (bl Fig. Fig. Fig. Fig. Fig. C/H (mm) Fig. 10 Fig. 12 (al (b) Fig. 13 h (bl Fig. 14)

Claims (2)

[Claims] (1) The conductor of the electric wire is placed on the conductor crimping part formed in a U-shape by opposing crimping clamping arms, and the electric wire is crimped with the crimp terminal by sandwiching and crimping it between the crimping grooves of a pair of crimping molds. In the method, the tip of the crimping clamp arm is formed substantially parallel to the axis of the crimping terminal, and the crimping groove is tapered and crimped,
A method for crimping a crimp terminal and an electric wire, characterized in that the crimping height of the conductor crimping part and the depth of biting of the tip of the crimp arm into the conductor are gradually changed along the length direction of the conductor. (2) In the crimping structure between a wire and a crimp terminal in which a conductor of an electric wire is placed and crimped on a conductor crimping part formed in a U-shape by opposing crimping clamping arms, the crimping height of the conductor crimping part and the crimping A crimp structure for crimping a crimp terminal and an electric wire, characterized in that the depth of biting into the conductor at the tip of the clamping arm is varied along the length direction of the conductor.