JP2620843B2 - Method of manufacturing conductor connection terminal - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a terminal used for connecting a conductor such as an electric wire or a fuse.

[0002]

2. Description of the Related Art There is known a conductor connecting terminal in which a flange is formed at an appropriate position in the axial direction of a short bar made of metal having one end side and the other end side formed into a cylindrical shape, respectively. This type of terminal is, for example, crimping the one-side cylindrical part into which the electric wire is inserted and the other-side cylindrical part to connect the electric wires, or the one-side cylindrical part into which the electric wire is inserted and the other-side cylindrical part into which the fuse terminal is inserted. It is used for connecting the electric wire and the fuse by caulking the respective parts. The flange provided on this type of terminal is useful for preventing the terminal from being pulled out or dropped when the terminal is embedded in the insulating outer layer of synthetic resin.

Conventionally, as a method of manufacturing such a conductor connecting terminal, a starting bar is formed by cutting a metal bar into a length capable of forming one terminal, and one end of the starting bar is formed. The side and the other end are drilled to form one side cylindrical part and the other side cylindrical part, respectively. There is a method of forming a flange portion by grinding with, for example.

[0004]

However, in the conventional method of drilling or grinding the starting rod material as in the conventional method, the material yield is reduced due to the generation of waste material in such processing, and the material yield is reduced. There is a problem in that the production efficiency is deteriorated due to the need for skill in the processing.

[0005] The present invention has been made in view of the above problems, and has as its object to provide a method of manufacturing a conductor connection terminal which does not generate any waste material and has high production efficiency.

[0006]

A method of manufacturing a conductor connecting terminal according to the present invention includes the following steps A to F.

A. A bar forming step of forming a starting bar by cutting a metal round bar into a length capable of forming one terminal. B. First having an inner diameter that matches the outer diameter of the starting rod
The hole is concentric with a first pin member which is movable between an inner position of the first hole and an outer position of the first hole and has an outer diameter shorter than the inner diameter of the first hole. Inserting the starting bar into the first hole of the first mold provided in the first die, and bringing one end surface of the starting bar into contact with the tip of the first pin member set at the internal position. . C. A second having an inner diameter corresponding to the outer diameter of the starting rod;
The second pin member of the second type, which includes a hole and a second pin member concentrically slidable between an inner position of the second hole and an outer position of the second hole, is a second type. The second pin member is inserted into the first hole by projecting from the second hole, and the second pin member is inserted into the second hole.
A pin member presses the other end surface of the starting bar inserted into the first hole portion in the axial direction, and pushes the first pin member into the starting bar, thereby removing surplus material of the starting bar into the first pin member. Forming a one-sided tubular portion by letting it escape into a gap between the outer surface of the first member and the peripheral surface of the first hole. D. A push-back step of inserting the single-hole bar obtained through the one-side tubular portion forming step into the second hole of the second mold by projecting the first pin member from the first hole. E. FIG. A third having an inner diameter corresponding to the outer diameter of the starting bar
A hole, a concave portion formed concentrically in the periphery of the opening of the third hole to be larger in diameter than the third hole, and an outer diameter of the first pin member concentrically protruding into the third hole. A third pin having the same outer diameter is inserted into the third hole of a third die having a single pin, and a bar having a single hole is pushed into the third hole. The entire gap between the hole and the peripheral surface of the third hole is filled, and the outer peripheral portion of the recess is closed with the front end surface of the second mold in which the other end of the bar with one hole is held by the second hole. A flange portion forming step of pressing the other end surface of the bar member with one hole in the axial direction with a second pin member to swell the surplus material of the bar member with one hole into the recess to form a flange portion; . F. A fourth having an inner diameter corresponding to the outer diameter of the starting rod;
The fourth hole in the fourth mold, which includes a hole and a fourth pin member concentrically protruding into the fourth hole and having an outer diameter shorter than the inner diameter of the fourth hole, Third of type 3
The fourth pin member is fitted with a single hole while the front end surface of the fourth mold is fitted on the flange of the single-hole bar while being fitted into the other end of the single-hole bar held by the hole. By pushing in the axial direction from the other end surface of the bar, the surplus material of the bar with one hole escapes to the gap between the outer surface of the fourth pin member and the peripheral surface of the fourth hole, and the other side cylindrical portion is released. Another side cylindrical portion forming step of forming.

[0008]

According to the present invention, it is possible to manufacture a conductor connection terminal having a flange portion at the axially intermediate portion of a double-holed bar material without generating waste material.

In particular, according to the present invention, between the one-side tubular portion forming step and the flange portion forming step, the single-hole bar obtained through the one-side tubular portion forming step is used in the one-side tubular portion forming step. A push-back process of pushing back to the mold 2 is performed, and in the other-side tubular portion forming process performed after the flange portion forming process, the third mold used in the flange portion forming process is continuously used. Process continuity is created between the tubular portion forming process, the flange portion forming process, and the other side tubular portion forming process, which not only helps to improve the terminal manufacturing efficiency, but also makes the entire process continuous. This is an advantageous condition for performing such automation.

[0010]

1 to 9 show a method of manufacturing a terminal according to an embodiment of the present invention, and FIG. 10 shows a cross section of a terminal manufactured by this method.

As shown in FIG. 10, a terminal 100 manufactured by this method has one end portion and the other end portion formed as a one-side cylindrical portion 110 and another-side cylindrical portion 120, respectively. 130. Hereinafter, each step will be described with reference to FIGS.

A. Bar Material Forming Step This step is a step of forming a starting rod material 6 by cutting a metal round bar into a length capable of forming one terminal. As the metal round bar, for example, a copper bar is used. The copper bar is fed out from the hole of the cut-off die by a certain length, and the copper bar fed out is sheared to obtain the starting bar 6. FIG. 1 shows that the starting bar 6
The state in which the mold 1 is faced is shown. The clamp 7 corresponds to a clamp for gripping and shearing the copper rod sent from the cutoff die.

The first mold 1 has a first hole 11 having a size that allows the starting bar 6 to be inserted without play, that is, an inner diameter corresponding to the outer diameter of the starting bar 6, and a first hole 11. 11 having an outer diameter smaller than the inner diameter of the first hole 11, which is movable between an inner position of the first hole 11 and an outer position of the first hole 11.
The pin member 12 is provided concentrically. Such first
A pushing mechanism 8 is provided facing the mold. This pushing mechanism 8
Has a pressing rod 82 urged by a spring 81, and the pressing rod 82 has an outer diameter that can be inserted into the first hole 11.

B. In this step, as shown in FIG. 2, the pushing mechanism 8 is brought close to the first mold 1, the starting bar 6 is inserted into the first hole 11 by the pressing rod 82, and one of the starting bars 6 is inserted. The end face 61 is brought into contact with the tip of the first pin member 12 set at the position inside the first hole 11.

C. One-side cylindrical part forming step In this step, the above-described first mold 1 and second mold 2 are used. The second die 2 has a second hole 21 having an inner diameter corresponding to the outer diameter of the starting rod (ie, the same inner diameter as the first hole 11), an inner position of the second hole 21 and a second hole. Part 21
And a second pin member 22 which can slide back and forth with respect to an external position of the motor. Since the second pin member 22 slides in and out of the second hole, the outer diameter of the second pin member 22 is almost the same as the inner diameter of the second hole 21.

The first mold 1 and the second mold 2 are arranged with their front end faces abutting each other as shown in FIG. 3, and the second pin member 22 of the second mold 2 is projected from the second hole 21 so that Second
The pin member 22 is inserted into the first hole 11 as shown in FIG. 4, and the other end face 62 of the starting bar 6 inserted into the first hole 11 by the second pin member 22 is indicated by an arrow X1. Then, the first pin member 12 is pushed into the starting bar 6 as shown in FIG. In this way, the first bar 6
Starting bar 6 generated by pushing in the pin member 12
Surplus material is released into the gap between the outer surface of the first pin member 12 and the peripheral surface of the first hole portion 11, and the one-side cylindrical portion 1
10 are formed. In this case, if the entire space is filled with the surplus material, the end surface of the one-sided cylindrical portion 110 is finished finely.

D. Push-back process In this process, as shown in FIG. 5, the first pin member 12 is advanced through arrow X2 and protrudes from the first hole portion 11, thereby being obtained through the above-described one-side cylindrical portion forming process. The single-hole bar 6 ′ is inserted into the second hole 21 of the second mold 2.

E. Flange Forming Step In this step, the above-described second mold 2 and third mold 3 are used. The third mold 3 has a third inner diameter corresponding to the outer diameter of the starting rod (that is, the same inner diameter as the first hole 11).
The hole 31 and the third hole 31 in the peripheral edge of the opening of the third hole 31.
A concave portion 32 formed concentrically with a diameter larger than that of the first pin member 12, and a third pin member 33 projecting concentrically into the third hole portion 31 and having the same outer diameter as the outer diameter of the first pin member 12. Is provided.

The third mold 3 and the second mold 2 are arranged with their front end faces facing each other as shown in FIG. Then, as shown in FIG. 7, the second pin member 22 is advanced to push the single-hole bar 6 ′ into the third hole 31 of the third mold 3, and the one-sided cylinder of the single-hole bar 6 ′ is pressed. The portion 110 fills the entire gap between the outer surface of the third pin member 33 and the peripheral surface of the third hole 31. Further, the outer peripheral portion of the recess 32 is closed by the front end face of the second mold 2 holding the other end of the bar member 6 ′ with a single hole by the second hole portion 21. The other end surface 62 of the material 6 ′ is pressed in the axial direction by the second pin member 22 as indicated by an arrow X3. By doing so, the second bar material 6 'with one hole is
Excess material of the single-hole bar 6 ′ generated by pressing the pin member 22 is released into the recess 32 and swells, and a flange 130 is formed at the axially intermediate portion of the single-hole bar 6 ′. Is done.

F. Other Side Cylindrical Portion Forming Step In this step, the third mold 3 and the fourth mold 4 described above are used. The fourth mold 4 has a fourth inner diameter corresponding to the outer diameter of the starting rod (ie, the same inner diameter as the first hole 11).
A hole 41 and a fourth pin member 42 concentrically projecting into the fourth hole 41 and having an outer diameter shorter than the inner diameter of the fourth hole 41 are provided concentrically.

The fourth and third dies 4 and 3 are arranged with their front end faces abutting each other as shown in FIG. Then, as shown in FIG. 8, the fourth hole 41 of the fourth mold 4 is
While being fitted into the other end of the single-hole bar 6 ′ held by the hole 31, and with the front end face of the fourth mold 4 abutting the flange 130 of the single-hole bar 6 ′, 4-pin member 42
Is pushed in the axial direction from the other end face 62 of the bar member 6 'with one hole as shown in FIG. In this way, the surplus material of the bar member 6 ′ with one hole generated when the fourth pin member 42 is pushed into the bar member 6 ′ with one hole is filled with the outer surface of the fourth pin member 42 and the fourth hole 41. The conductor connection terminal with double holes described with reference to FIG. 10 is released by being released into the gap between the peripheral surface of 100 are obtained. In this case, if the entire space is filled with surplus material, the other-side cylindrical portion 11
The end face of 0 is beautifully finished.

[0022]

According to the present invention, it is possible to manufacture a conductor connection terminal having a flange at the axially intermediate portion of a bar with double holes without generating waste material. Moreover, in the present invention, since it is not necessary to perform drilling or grinding with a lathe on the starting rod, it is possible to efficiently produce conductor connection terminals of constant quality without skill. .

Further, according to the present invention, it is possible to provide continuity in a series of steps from the rod material forming step to the other-side cylindrical portion forming step. This has the effect of making it easier to do.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a state in which a starting bar according to an embodiment of the present invention faces a first mold.

FIG. 2 is an explanatory diagram of a starting rod material inserting step in the embodiment.

FIG. 3 is an explanatory view of a state in which a first mold and a second mold in the same embodiment are arranged in abutting relation.

FIG. 4 is an explanatory diagram of a one-side cylindrical portion forming step in the embodiment.

FIG. 5 is an explanatory diagram of a push-back step in the embodiment.

FIG. 6 is an explanatory diagram of a state in which a third mold and a second mold in the same embodiment are arranged to face each other.

FIG. 7 is an explanatory diagram of a flange portion forming step for the embodiment.

FIG. 8 is an explanatory diagram of a state in which a fourth mold and a third mold in the same embodiment are arranged to face each other.

FIG. 9 is an explanatory diagram of a step of forming the other-side cylindrical portion in the embodiment.

FIG. 10 is a sectional view of a conductor connecting terminal manufactured by the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st type 2 2nd type 3 3rd type 4 4th type 6 Starting bar 6 'Bar with one hole 11 1st hole 12 1st pin member 21 2nd hole 22 2nd pin member 31 3rd Hole 32 Recess 33 Third pin member 41 Fourth hole 42 Fourth pin member 61 One end face of starting bar 62 Other end face of starting bar 110 One side cylindrical portion 130 Flange

Claims (1)

(57) [Claims] 1. A bar material forming step of forming a starting bar by cutting a metal round bar into a length capable of forming one terminal, and a first inner diameter having an inner diameter corresponding to the outer diameter of the starting bar. The hole is concentric with a first pin member which is movable between an inner position of the first hole and an outer position of the first hole and has an outer diameter shorter than the inner diameter of the first hole. Inserting the starting bar into the first hole of the first mold provided in the first die, and bringing one end surface of the starting bar into contact with the tip of the first pin member set at the internal position. A second hole having an inner diameter corresponding to the outer diameter of the starting rod, and a second pin member capable of sliding in and out between an inner position of the second hole and an outer position of the second hole. The second pin member of the second mold having the concentric shape is projected from the second hole, and the second pin member is inserted into the first hole. The second pin member presses the other end surface of the starting bar inserted into the first hole in the axial direction and pushes the first pin member into the starting bar, thereby removing the surplus material of the starting bar into the first bar. A one-side cylindrical portion forming step of forming a one-side cylindrical portion by escaping into a gap between the outer surface of the pin member and the peripheral surface of the first hole portion, and projecting the first pin member from the first hole portion to form a one-side cylindrical portion. A push-back step of inserting the single-hole bar obtained through the part forming step into the second hole of the second mold; a third hole having an inner diameter corresponding to the outer diameter of the starting rod; A concave portion formed concentrically in the periphery of the opening of the three hole portion and having a diameter larger than that of the third hole portion; A single-sided cylinder of a single-hole bar is pushed into the third hole of the third mold having a third pin member having The front end face of the second mold in which the entire gap between the outer surface of the third pin member and the peripheral surface of the third hole is filled with the portion and the other end of the bar with one hole is held by the second hole. With the outer peripheral portion of the recess closed, the other end surface of the single-hole bar is pressed in the axial direction with a second pin member to cause the excess material of the single-hole bar to swell into the recess. A flange forming step of forming a flange, a fourth hole having an inner diameter corresponding to the outer diameter of the starting bar, and an outer protruding concentrically into the fourth hole and shorter than the inner diameter of the fourth hole. The fourth hole of the fourth mold concentrically provided with the fourth pin member having a diameter is fitted into the other end of the single-hole bar held by the third hole of the third mold. At the same time, the fourth pin member is pushed in the axial direction from the other end surface of the single-hole bar while the front end surface of the fourth mold is in contact with the flange of the single-hole bar. The other-side cylindrical portion forming step of forming the other-side cylindrical portion by inserting the surplus material of the single-hole bar into the gap between the outer surface of the fourth pin member and the peripheral surface of the fourth hole portion, The manufacturing method of the terminal for conductor connection containing.