JPH08227786A - Manufacture of flexible feed terminal - Google Patents

Abstract

PURPOSE: To provide a method for manufacturing a flexible feed terminal in which the flexible feed terminal can be easily manufactured with simple press metal molds and a small number of the used metal molds in a short process, the cost of manufacturing equipment can be suppressed low at manufacturing many kinds of articles, those of various sizes can be easily manufactured in a short process, and the superposition of two or more plain mesh braided wires is never shifted. CONSTITUTION: Raised pieces 14b, 14b are raised while ensuring a bottom surface part 14c in the center of a rectangular copper plate, and housed in a lower metal mold K1 , and the end of a plain mesh braided wire 13 is placed therein. An upper metal mold K2 is lowered so that the raised pieces 14b, 14b are situated on the inside of ends m1 , m1 on the far sides of curved surfaces (m), (m), and pressurized until the top ends 14b", 14b" are mutually approached downward, and protruded to the plain mesh braided wire 13. An upper metal mold K3 is lowered instead of the upper metal mold K2 to crimp and compress the curved raised parts 14b, 14b into the plain mesh braided wire 13, and the top ends 14b", 14b" are bitten into the middle of the thickness of the plain mesh braided wire 13.

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 flexible power supply terminal comprising a flat braided wire for connecting a pair of terminal electrodes whose relative positions between terminals change due to an earthquake or movement of the device.

[0002]

2. Description of the Related Art A flexible power supply terminal is, for example, an input terminal of a large current using device such as a spot welding machine or an electric discharge machine which uses a large current of hundreds to thousands of amps, and the large current using device. A large current can be applied by connecting a flat-current braided wire to the output terminal of the high-current power supply device that supplies a large current to the terminal. Even if it changes, it is a power supply terminal that avoids the possibility of disconnection by absorbing the relative deviation by flexibility.

FIG. 3 shows a first conventional flexible feed terminal using a flat braided wire, which is a flat rectangular tube obtained by cutting a cylindrical copper tube into short pieces and flattening them with a press. The two flat wire braided wires 1 are passed through the two shaped connecting terminals 2a and 2b (Fig. 3 (d)), and the connection terminals 2a and 2b are further crushed in the flat direction by pressing to be integrated with the flat wire braided wire 1. In this case, two bolt through holes 3 and 3 are formed at required positions of the connection terminals 2a and 2b.

FIG. 4 shows a second conventional flexible feed terminal using a flat braided wire, which is shown in (a) and (b) of FIG.
As shown in FIG. 5, the end of the flat braided wire 5 is inserted into the gap 4c between the upper surface 4a and the lower surface 4b of the connection terminal 4 formed by bending a strip-shaped copper plate into a U-shape by press and Line 5
Abutting the end edge of and the folded end of the connection terminal 4,
As shown in (c), the connection terminals 4 are crushed in a flat direction by a press to be integrated with the flat net braided wire 5 at both ends of the flat net braided wire 5, and bolts are provided at required positions of each connection terminal. A through hole 6 is formed.

FIG. 5 shows a third conventional flexible feed terminal using a flat braided wire. As shown in FIG. 5 (a), a strip-shaped copper plate is bent into a U-shape by pressing. 7c between the upper surface 7a and the lower surface 7b of the connecting terminal 7
The end portion of the flat braided wire 8 is put in the above, and as shown in (b), the side end of the flat braided wire 8 and the folded end of the connection terminal 7 are brought into contact with each other, and the connection terminal 7 is flattened by pressing. The flat mesh braided wire 8 is crushed and integrated with the flat mesh braided wire 8 at both ends, and bolt through holes 9 are formed at required positions of each connection terminal.

FIG. 6 shows a fourth conventional flexible feed terminal using a flat braided wire, in which a strip-shaped copper plate is bent by a press into a U-shape and the rising pieces on both sides are inclined with respect to each other. Connection terminal 10 bent so as to approach
The end portion of the flat braided wire 11 is placed on the lower surface portion 10a of the and the both ends of the flat braided wire 5 are connected to the rising piece 10 of the connection terminal 4.
Abut on the bases of b and 10c and press the rising piece 1
0b and 10c are crushed in the flat direction to be integrated with the flat braided wire 11 at both ends of the flat braided wire 11,
A bolt through hole 12 is formed at a required position of each connection terminal. Similarly, even in the flexible power supply terminal shown in FIG. 5 and the flexible power supply terminal shown in FIG. 6, since there is a springback at the bent portion, the connection terminal is easily opened and integrated with the flat braided wire. Insufficient and has similar problems.

[0007]

In the flexible power supply terminal shown in FIG. 3, the inner diameter of the cylindrical copper tube used as the material for the connection terminals 2a and 2b is the entire circumference when the flat mesh braided wire 1 having two layers is crushed. It has to be the same, and therefore, the selection of the cylindrical copper tube according to the width of the flat braided wire 1 is limited, so that it is difficult to produce various capacities. Further, in the flexible power supply terminal shown in FIG. 3, the inner diameter of the cylindrical copper tube used as the material for the connection terminals 2a and 2b must be the same as the entire circumference when the flat braided wire 1 having two layers is crushed. , Fig. 3
As shown in (d), the flat rectangular tubular connection terminals 2a, 2b.
The flat net braided wire 1 of two layers is undulated and passed through,
If the connection terminals 2a and 2b are not crushed properly, the flat braided wires 1 and 1 will not be piled up neatly, resulting in a defect.

The flexible power supply terminal shown in FIG.
Since there is a spring back at the bent portion of the connection terminal 4, the upper surface portion 4a and the lower surface portion 4b of the connection terminal 4 are easily opened, and the flat mesh braided wire 5 is insufficiently integrated, and the relative position between the terminals changes up and down. Even if a tension acts on the braided wire, the flat braided wire 5 easily comes out from the connection terminal 4, and a gap is prevented from being formed at the contact point between the edge of the flat braided wire 5 and the folded end of the connection terminal 4. There is a risk that moisture may enter the gap between the connection terminal 4 and the flat braided braided wire 5 where this gap or separation has occurred and rust may occur, resulting in poor conduction. Similarly, even in the flexible power supply terminal shown in FIG. 5 and the flexible power supply terminal shown in FIG. 6, since the bent back portion of the connection terminal 4 has a spring back, the connection terminal is easily opened and the flat wire braided wire is used. There is a similar problem due to insufficient integration.

However, there is a drawback that the flat braided wire is easily pulled out from the connection terminal due to the spring back, and the flexible power supply terminals shown in FIGS. 4 and 5 are hardly adopted, and there is no such drawback. The flexible power supply terminal shown in 3 is generally adopted.

Therefore, even though it is a flexible power supply terminal in which a flat braided wire is tightened with a connection terminal formed by bending a strip-shaped copper plate, there is no drawback that the flat braided wire easily comes out of the connection terminal. It was left as a problem that it was easy to make a wire having a size of 2 and that it was fastened with a connecting terminal so that the overlapping of two or more flat net braided wires did not shift.

The present inventors have devised in view of the above-mentioned points, and like the flexible power supply terminals shown in FIGS. 4, 5 and 6, the connection terminals are formed by bending a strip-shaped copper plate. However, the springback of the bent part of the connection terminal does not appear, the tightening force of the connection terminal is strong, and even if the relative position between terminals changes up and down and tension acts on the braided braid wire, the connection We invented a flexible power supply terminal that does not have the risk of a flat braided wire coming out of the terminal, and filed a joint patent application separately with a joint inventor company.

The flexible power supply terminal according to the joint patent application is
As shown in FIGS. 2A and 2B, the connection terminals 14 are fitted and fixed to both ends of the flat braided wire 13. 2B, the connecting terminals 14 and 14 are formed by bending a strip-shaped copper plate 14a shown by a dashed line in FIG. 2B into a U-shape shown by a chain double-dashed line, and rising pieces 14b and 14b on both sides and a flat braided wire 13 between them.
The bottom surface portion 14c that matches the width dimension of the
The end of the flat braided wire 13 is inserted and placed on the d, and the rising pieces 14b and 14b on both sides are raised and the bases 14b 'and 14b' are left, and the flat braided wire 13 is left.
And is crimped horizontally to the flat braided wire 13 and crimped to the flat braided wire 13 while the leading edges 14b ", 14b" of the rising pieces 14b, 14b on both sides are bent inward at right angles and are in contact with each other. It cuts into the middle of the thickness of. Then, bolt through holes 15 and 15 are formed at two locations that coincide with the tips 14b ″ and 14b ″. In this way, the tips 14b ″ of the rising pieces 14b, 14b,
Since 14b "bends inward at a right angle and cuts into the middle of the wall thickness of the flat braided wire 13, the springback force of the bent portion is the force that pushes each other at the surface where the tips 14b", 14b "meet. While being converted and balanced, the engaging force of the flat braided wire 13 is also applied to the tip 14
There is no fear that b "and 14b" will come out. The flat braided wire 13 is made of, for example, a 0.12 mmφ ultrafine annealed copper wire.

According to the flexible power supply terminal shown in FIG.
Similar to the conventional products shown in FIGS. 5 and 6, the flexible power supply terminal is formed by fastening a flat braided wire with a connection terminal formed by bending a strip-shaped copper plate. Since the tip of one piece was made into a rib shape by biting into the center of the width of the flat braided wire to the middle of the wall thickness, the flat braided wire was tightened with the connection terminal formed by bending the conventional strip-shaped copper plate. The tightening force of the connection terminal is stronger than that of the flexible power supply terminal.
Similarly, even if the relative position between terminals changes up and down and tension acts on the braided braid, there is no fear that the braided braid will come out of the connection terminal.

However, in the case of manufacturing the flexible power supply terminal shown in FIG. 2, the above-mentioned separate patent application is applied to a process in which the bending process which is generally known in the past is devised to increase the yield and to manufacture it efficiently. Although it is disclosed in the specification, the cost of manufacturing equipment is high when manufacturing a wide variety of products due to many bending steps, complicated press dies and upper die replacement. Is expensive.

The present invention has been devised in view of the above-mentioned points. The press die is simple, the cost of production equipment can be kept low when producing a large variety of products, and various sizes are available. An object of the present invention is to provide a method of manufacturing a flexible power supply terminal, which can be easily manufactured in a short process and can be manufactured so that the overlapping of two or more flat net braided wires does not shift.

[0016]

According to the present invention, a strip-shaped copper plate 14a is bent in a channel shape, and a bottom portion 14c of the channel-shaped copper plate is formed on a pressure receiving surface of a lower die K ₁ of a press. With the end of the flat braided wire 13 placed in the U-shaped groove and the end of the flat net braid 13 placed on the bottom surface 14c, the upper mold K ₂ of the press is lowered to form on the pressing surface of the upper mold K _2. The upper mold K ₂ is lowered by the required dimension such that the rising pieces 14b, 14b come inside the ends m ₁ , m ₁ on the distant side of the two arranged substantially semi-cylindrical concave curved surfaces m, m. Let the rising pieces 14b, 1
4b is curved and the rising pieces 14b, the tip 14 of 14b
b ", 14b" close down the Tsukitate to tint the braided wire 13, then the curved rising piece 14b pressing surface is lowered a flat upper mold K _3, tint braid 1 14b
3 and is bent horizontally and crimped to the braided braided wire 13 and the rising pieces 14b on both sides, the tips 14b "of the 14b",
14b ″ is made to bite into the flat wire braided wire 13 halfway through, and then removed from the mold to form a bolt through hole 15 in each connection terminal. It is a thing.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a process diagram according to an embodiment of a method for manufacturing a flexible power supply terminal of the present invention, which is shown in FIGS.
(F). In FIG. 1C, the upper die K ₂ is engaged with and guided by the guide pin P fixed to the lower die K ₁ .
Further, in FIG. 1C, the side wall portion K of the lower mold K ₁ is
_{1 'forms} one side of the U-shaped groove for receiving the bottom surface portion 14c of the channel-shaped copper plate. Then, before accepting the channel-shaped copper plate, pull the handle g to pull out the side wall K _{1 ′.}
When the channel-shaped copper plate is received, the handle g is pushed in and the channel-shaped copper plate is pinched by the movable side wall K _{1 ′} to be positioned in cooperation with the fixed side wall K _{1 ″} to lock the rod r. It is designed to be locked by the key k, and after pressing (the next step of FIG. 1D), the lock key k is removed and the handle g is pulled so that the side wall portion K _{1 ′} is separated from the connection terminal 14. FIG. 1E shows a state in which the upper mold K ₂ set in the press machine of the process of FIG. 1D is replaced with the upper mold K ₃ having a flat pressing surface, or set in another press machine. Between lower mold K ₁ and upper mold K ₃ Fig. 1
The state in which an intermediate product manufactured up to the step (d) is transferred is shown.

In this method of manufacturing the flexible power supply terminal, a strip-shaped copper plate is used as a processing material for the connection terminals 14 and 14 which are fitted and fixed to both ends of the flat braided wire 13, and the center of the copper plate in the longitudinal direction is used. Bottom part 14 that matches the width dimension of the flat braided wire 13
c is secured and both sides thereof are bent at right angles and raised as symmetrical left and right rising pieces 14b, 14b to be bent into a channel shape, and the bottom portion 14c of the channel-shaped copper plate is pressed by the lower die K ₁ of the press. The upper die K ₂ of the press is lowered by being accommodated in the U-shaped groove formed in the surface and with the end of the flat braided wire 13 placed on the bottom surface portion 14c.
_The upper mold is made such that the rising pieces 14b, 14b are positioned inside the two side-by-side substantially semi-cylindrical concave curved surfaces m formed on the pressure surface ₂ and the ends m ₁ , m ₁ on the side away from each other. K ₂ is lowered by a required dimension, and the tips 14 of the rising pieces 14b, 14b are lowered.
b ”, 14b” are pressed downward as two bending curved surfaces m, m of the upper mold K ₂ until the b ”and 14b” come close to each other and stand up against the flat braided wire 13. , 14b are each curved into a substantially semi-cylindrical shape,
Next, the upper die K ₃ having a flat pressing surface is alternately lowered to crimp and flatten the curved rising pieces 14b, 14b to the flat net braided wire 13, thereby raising the rising base 14b ′,
While leaving 14b ', the rising pieces 14b, 14b are wrapped around the flat net braided wire 13 and horizontally bent to be crimped to the flat net braided wire 13 and the tips 1 of the rising pieces 14b, 14b on both sides are crimped.
4b "and 14b" are cut into the flat braided wire 13 partway in the thickness direction (preferably about 1/2). The reason for setting the biting dimensions of the tips 14b ″, 14b ″ of the rising pieces 14b, 14b to the midway in the thickness direction of the flat braided wire 13 is that if the tips 14 of the rising pieces 14b, 14b are formed.
When the bite size of b ", 14b" is made equal to the thickness of the flat braided wire 13, there is no direction in which the flat braided wire 13 escapes from the pressure, and the flat braided wire 13 has a tip 14
This is because there is a risk of breakage at the bite points "b" and 14b ", which is not preferable in terms of manufacturing and quality. Then, after removing from the mold, bolt through holes 15, 15 are formed in the connection terminals 14, 14, respectively.

The flexible power supply terminal of the present invention and the pair of connection target terminal electrodes are connected by stacking the connection terminals 14 and 14 on the lower surface of the connection target electrode and using a bolt to connect the flexible power supply terminal and the connection terminal electrode. Insert the flat washer and spring washer through the bolt through hole of the electrode, and then tighten the nut. Connection terminals 14, 1
4 is the tip 14b ″, 1 of the rising pieces 14b, 14b.
4b "bites into the center of the flat braided wire 13 in the width direction in the middle of the wall thickness in a rib shape, so that the pressing force of the bolts and nuts can be sufficiently received.
14 has a structure in which, in addition to the force of hugging and tightening the flat braided wire 13 that it has, the pressing force of bolts and nuts is effectively applied.

[0020]

As described above, according to the method of manufacturing a flexible power supply terminal of the present invention, a strip-shaped copper plate is bent and formed as in the conventional products shown in FIGS. Although it is a flexible power supply terminal made by tightening a flat braided wire at the terminal, there is no springback at the bent part of the connection terminal, and a strong tightening force almost equivalent to that of the conventional product shown in FIG. 3 can be obtained. The flexible feed terminal can be manufactured in a short process because the press mold is simple, the number of molds used is small, and it can be manufactured more easily than the conventional product shown in FIG. 3. Since a strip-shaped copper plate is used, It can be manufactured at a lower cost than the conventional product shown in, and the cost of manufacturing equipment can be kept low when manufacturing a wide variety of products.
It can be manufactured so that the overlapping of two or more flat braided wires does not shift.

[Brief description of drawings]

FIG. 1 is a manufacturing process diagram of a method of manufacturing a flexible power supply terminal according to an embodiment of the present invention.

FIG. 2 shows a flexible power supply terminal according to the invention of another patent application of the present inventors. (A) is a front view of a flexible power supply terminal, (b)
IIb-IIb sectional drawing in (a).

FIG. 3 shows a flexible feed terminal using a first, braided braided wire according to a conventional example. (A) is a side view of the flexible power supply terminal,
(B) is a front view of a flexible power supply terminal, (c) is a IIIb-IIIb sectional view in (b), (d) is a principal part sectional view at the time of manufacture.

FIG. 4 shows a second conventional method for manufacturing a flexible power supply terminal using a flat braided wire, wherein (a), (b), and (c) are manufacturing steps of the flexible power supply terminal. Fig.

FIG. 5 is a process drawing showing a third method for manufacturing a flexible power supply terminal using a flat braided wire according to a conventional example.

FIG. 6 is a process diagram showing a method of manufacturing a flexible power supply terminal using a fourth flat wire braided wire according to a conventional example.

[Explanation of symbols]

13 ... Flat wire braided wire 14 ... Connection terminal 14a ... Strip-shaped copper plate 14b ... Standing piece 14b '... Standing base 14b "... Standing piece tip 14c ... Bottom part K ₁・ ・ ・ ・ Lower mold K ₂・ ・ ・ Upper mold m ・ ・ ・ ・ ・ Concave curved surface m ₁・ ・ ・ ・ End of concave curved surface 15 ・ ・ ・ ・ ・ ・ Bolt through hole

Claims (1)

[Claims] 1. A strip-shaped copper plate is bent into a channel shape,
The bottom of the channel-shaped copper plate is housed in the U-shaped groove formed in the pressure receiving surface of the lower die of the press, and the end of the flat braided wire is placed on the bottom of the press. The upper mold is required by descending the mold so that the rising pieces come inside the ends on the distant side of the two substantially semi-cylindrical concave curved surfaces formed on the pressing surface of the upper mold. The size is lowered to bend the rising piece, and the leading end of the rising piece is closely approached downward and thrusts against the flat net braid, and then the upper die having a flat pressing surface is lowered to move the curved rising piece to the flat net braid. Wrap it, fold it horizontally, crimp it to the braided braid wire, and let the tips of the rising pieces on both sides bite into the braided wire halfway through the wall thickness, then remove it from the mold and drill a bolt through hole in each connection terminal. A method of manufacturing a flexible power supply terminal, comprising: