JPH01292775A - Connecting method for stranded conductor - Google Patents

Abstract

PURPOSE:To enable a stranded conductor to be connected to other conductor in a simple way and in a short time by inserting the end portion of the stranded conductor into a metal cylinder and calking the same, and after smoothing and finishing the end surface of the end portion thereof, friction welding it to the surface to be connected. CONSTITUTION:An end portion of a stranded conductor 1 is inserted into a metal cylinder 3 and the metal cylinder 3 is calked on the stranded conductor 1 to prevent the fraying of the strands 1a at this end portion and strengthen this portion. Then the end surface 4 of this end portion, where the fraying is prevented, is finished smooth so that this end surface 4 can be friction welded easily, and finally this end surface 4 is friction welded to the surface 2 to be connected. Thus, the stranded conductor 1 can be connected to the other conductor 2 in a simple way and in a short time, efficiently, strongly, and surely, without high level skill.

Description

DETAILED DESCRIPTION OF THE INVENTION OBJECTS OF THE INVENTION Field of Industrial Application The present invention relates to a method for connecting stranded conductors to other conductors for use in electrical equipment.

(Prior art) Conventionally, for example, a conductor that connects each winding end of a transformer and its crossover conductor or external connection terminal is made by further twisting a plurality of bare twisted wires made of thin annealed copper wires. By using this highly flexible composite stranded conductor, the work of connecting the conductors was facilitated. When connecting this composite stranded wire conductor to another conductor, they were overlapped for a length necessary for connection and connected to the conductor to be connected by silver brazing.

(Problem to be Solved by the Invention) As described above, when connecting a stranded wire conductor to another conductor by brazing, uniform wiring is applied simultaneously between the stranded wires and between both conductors in order to prevent the strands from fraying. It was necessary to infiltrate and solidify the molten wax, which required a high degree of skill. Further, in such a silver solder connection, there is a risk of corrosion because it is difficult to remove residual flux between the bare twisted wires. Furthermore, with such a connection method, butt connection with a rod-shaped conductor is difficult.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a method for connecting stranded wire conductors to other conductors easily, quickly, efficiently, firmly, and reliably without requiring a high level of skill.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, a method for connecting a stranded wire conductor according to the present invention includes fitting a metal cylinder over the end of the stranded wire conductor and connecting the stranded wire conductor with a metal tube. A caulking process in which the stranded wire conductor is caulked, an end face finishing process in which the end face of the stranded conductor to which the metal cylinder is caulked in this caulking process is smoothed, and this smoothed end face is rubbed against the surface to be connected. It consists of a connection process of press-welding.

(Function) By fitting a metal tube onto the end of the stranded wire conductor and caulking it to the stranded wire conductor, the stranded wire is prevented from fraying at this end and is reinforced. Next, by smoothing the end surface of this frayed end,
This end face is in a state where it is easy to friction weld, so finally,
This end face is brought into friction pressure contact with the surface to be connected.

(Example) An example of the present invention will be described below with reference to FIGS. 1 to 5.

First, FIG. 5 shows a connecting conductor 2 between windings as a connected surface on the end face of a composite stranded wire conductor 1 as a stranded wire conductor.
This shows the state where the connection has been completed.

Reference numeral 3 denotes a metal tube that is fitted over and caulked to the end portion, and 4 is an end surface of the end portion, which end surface is friction-welded to the upper surface of the crossover conductor 2.

Next, we will explain the procedure of such friction welding work, including the caulking process,
The end face finishing process and the connection process will be explained in sequence. In the caulking process, as shown in Fig. 1, a composite stranded wire conductor 1 is made by further twisting a plurality of bare stranded wires 1a, which are made by twisting a plurality of thin conductive wires made of mild steel. A presser winding 5 of the same type as the thin conductive wire described above is tightly wound to prevent the end portion from fraying. After that, a metal tube 3 made of the same material as the composite stranded wire conductor 1 is fitted onto the end portion of the stranded composite wire conductor 1 as shown in FIG. It is sandwiched between two-part molding dies 6 and 7 having a cylindrical press surface with an inner diameter that can be caulked, and the molds are clamped by a press machine (not shown). Then, as shown in FIG. 3, the metal tube 3 is caulked to the end of the composite stranded wire conductor 1, completing the second caulking process.

Next, caulking is performed by performing an end face finishing process to smoothen the end face 4 of the end portion of the composite stranded wire conductor l whose smoothness has been impaired by processing, by appropriate means such as cutting or grinding. Prepare for the connection process.

As shown in FIG.
9 is a rotating jig, which is set in the friction welding device 8 together with the
Metal WJ caulked and fixed to the end of the composite stranded conductor l
Grip the outer peripheral surface of 3.

Reference numeral 10 denotes a movable table on the fixed side, on which the conductor 2 is fixed by a gripping mechanism (not shown).

When the friction welding device 8 is operated in this set state, the rotating jig 9 is rotated and moved downward, so that the end surface 4 of the distal end of the composite stranded wire conductor 1 is connected to the connecting surface of the crossover conductor 2. It is pressed against the top surface, and due to the rotational friction heat generated at that time,
The end surface 4 is reliably fused to the upper surface of the crossover conductor 2 to complete the connection process.

Unlike conventional brazing methods, this friction welding method does not require highly skilled brazing techniques or concerns about corrosion of the conductor due to residual flux. Composite stranded wire conductor 1 can be easily, quickly, efficiently, strongly and reliably produced by simple mechanical operations.
can be connected to the conductor 2 by crossing.

FIG. 6 shows another embodiment of the present invention, which differs from the above embodiment in that the conductor to be connected is the center conductor of a transformer bushing, which was difficult to butt connect with conventional brazing depending on the method. It is located where you selected number 11.

In the above configuration, the metal cylinder 3 is cylindrical, but may be a polygonal cylinder of triangular or larger size, for example, and its material is not limited to copper. When a coated conductor is used as the stranded conductor, the coating at the end of the wire may be removed, and the conductors to be connected are of course not limited to those shown in the above embodiments.

[Effects of the Invention] As is clear from the above description, according to the method for connecting stranded wire conductors of the present invention, a metal cylinder is fitted onto the end of the stranded wire conductor and caulked, and then the end portion of the stranded wire conductor is crimped. After smoothing the end face, it is friction welded to the surface to be connected, so unlike conventional brazing and connection methods, highly skilled brazing does not require any skill and can easily handle stranded conductors. qi and can be efficiently and reliably connected to other conductors in a short time. And, of course, the problem of conductor corrosion due to residual flux is also solved.

[Brief explanation of the drawing]

Figures 1 to 5 show an embodiment of the present invention. Figure 1 is a perspective view of a state in which a metal tube is being fitted onto the end of a composite stranded wire conductor, and Figure TS2 is a crimping process. An explanatory diagram of
FIG. 3 is a perspective view of a stranded wire conductor with a metal tube caulked to the end portion, FIG. 4 is a longitudinal sectional view showing how the stranded wire conductor and connected conductor of FIG. 3 are set in a friction welding device. FIG. 5 is a perspective view of a connection point between both connected conductors. FIG. 6 is a diagram corresponding to FIG. 5 showing another embodiment of the present invention. In the figure, 1 is a composite stranded wire conductor (stranded wire conductor), 2 is a crossover conductor (connected surface), 3 is a metal tube, 4 is an end surface, 8 is a friction welding device, and 11 is a center conductor (connected surface). be.

Claims (1)

[Claims] 1. A caulking process in which a metal cylinder is fitted over the end of the stranded conductor and crimped onto the stranded conductor, and the end face of the stranded conductor to which the metal cylinder is crimped is smoothed in this crimping process. A method for connecting stranded wire conductors, which comprises an end face finishing process, and a connecting process, in which the smoothed end face is frictionally welded to a surface to be connected.