JPH0261787B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for manufacturing a twisted wire terminal formed by twisting a bundle of a large number of metal wires.

Prior art and its problems The twisted wire terminal described above consists of a bundle of many metal wires, and since each wire is twisted, many contact points are formed on its circumferential surface, making it reliable even for weak signals. It has the advantage of promising highly sexual connections.

The above-mentioned twisted wire terminal attempts to make contact by capturing its peripheral surface on the socket side.
In order to ensure multi-point contact, the metal wire preferably has shrinkage elasticity.

For example, Japanese Patent Publication No. 44-23592 discloses a cage-shaped twisted wire having an inner cavity, and the density of the hollow twisted wire is made coarse to impart shrinkage elasticity.

However, since this twisted wire terminal is hollow, it lacks rigidity, and in order to capture it, a slightly thicker core wire must be inserted into the hollow and a twisted wire must be formed around it. Material preparation is required. In addition, in order to form the bulge in the stranded wire, a special mold is required, and the stranded wire is placed in the mold and the tip of the stranded wire is compressed in the axial direction to form the bulge. This method of compressing the wire rod in the axial direction and leaving it to deformation of each wire rod may cause uneven deformation of each wire rod in the length direction of the wire rod, such as buckling, and there is a risk that the desired bulge shape cannot be obtained. In addition, it generally requires a large number of processing steps and has the drawback of high cost.

Purpose of the Invention The present invention solves the above-mentioned drawbacks, makes it possible to manufacture a twisted wire terminal with a beautiful bulge and strength from a bundle of metal wires without using reinforcing core wires, etc. The object of the present invention is to provide a method for manufacturing a stranded wire terminal that can be obtained through a very simple process and is inexpensive.

Structure of the Invention That is, the present invention uses a bundle of a large number of metal wires as a material for a twisted wire terminal, and after once twisting the bundle of metal wires, the ends of the twisted wire bundle are The difference in the amount of twist that occurs between the metal wire at the outer periphery and the metal wire at the core (the amount of twist in the metal wire at the outer periphery is inevitably larger and the amount of twist at the core metal wire is smaller). The deviation is effectively used as a factor for generating a bulge by the untwisting, and the desired twisted wire terminal can be easily obtained.

Examples of the invention Embodiments of the present invention will be described below based on the drawings.

First, as shown in FIG. 1, a metal wire bundle 1 in which a large number of metal wires 2 are bundled is prepared.

Next, a twisting force is applied to both ends of the metal wire bundle 1 in opposite directions to twist the entire metal wire bundle 1 into a spiral shape, thereby forming a twisted wire bundle 3 having a twisting tendency (see FIG. 2). The end faces of this twisted wire bundle 3 are fused (base material fused) by laser cutting, which will be described later. 4 indicates the fused portion.

The twisted wire bundle 3 has a difference in the amount of twist between the outer periphery and the core, and the amount of twist gradually increases from the core toward the outer periphery. This difference in twist amount is generated because the metal wire on the outer periphery moves more in the axial direction as the twisting process progresses. Preferably, the above-mentioned twisting process is performed until all the metal wires 2 are brought into close contact with each other.

As shown in FIG. 4, the ends of the twisted wire bundle 3 thus obtained are grasped and restrained by the chucks 5 and 6 at a constant interval, the rear chuck 6 is fixed, and the front chuck 5 is twisted. It rotates in the opposite direction to the processing direction and performs untwisting processing. The amount of untwisting is set to be smaller than the amount of twisting shown in FIG.

As mentioned above, the twisted wire bundle shown in FIG. 3 has a difference in the amount of twist between the metal wires at the outer periphery and the core. That is, the metal wire at the outer periphery is given a larger amount of twist. Due to this deviation in the amount of twisting and the amount of untwisting, a bulge 7 with a coarse metal wire density is generated at the outer periphery. As shown in FIG. 4B, the metal wire density gradually becomes coarser from the core toward the outer periphery, resulting in a larger bulge 7 at the outer periphery. After the untwisting is applied, the end portion of the twisted wire bundle including the bulge 7 generating portion is cut by a laser 8. In this way, a twisted wire terminal 10 having a bulge 7 is obtained. Preferably, said cutting is carried out in the outer position of the rear chuck 6.

The stranded wire terminal 10 and the remaining stranded wire bundle 3 are fused together at the end face, which is the cutting interface, by the laser cutting. That is, the twisted wire terminal 7 has fused portions 4 and 9 on both end faces thereof, and maintains the bundled state and the above-mentioned untwisted state more reliably. Also, the remaining twisted wire bundle 3
has a fused portion 4 shown in FIG. 3 on its end face, and is used as a raw material for a twisted wire terminal in the subsequent untwisting process.

The above fused parts 4 and 9 were formed at the same time as cutting by using the laser 8, but they can be cut using a normal mechanical cutter and heated after cutting to fuse the base material, or by using another fusible material such as solder. It is possible to fuse with metal. Further, after laser cutting, another fusible metal may be used to further strengthen the fusion bond.

FIG. 6 shows a configuration in which a substantially spherical metal bulge 11 is formed on the end face of the twisted wire terminal 10 on the insertion side into the socket, so that the terminal can be inserted into and removed from the connection port. The stranded wire terminal 10 may be connected to the seventh terminal depending on the implementation.
As shown in the figure, a metal piece such as a sleeve is attached to the base end to complete the product. Twisted wire terminals 10 are mass-produced by repeating the steps shown in FIGS. 1 to 6 described above.

Effects of the Invention According to the present invention, a desired stranded wire terminal can be manufactured very easily by carrying out the basic steps of twisting a bundle of metal wires, giving them reverse twisting, that is, untwisting them, and sequentially cutting them. It is possible to reduce man-hours, improve mass productivity, and achieve cost reductions.

In addition, buckling does not occur when compression is applied from the tip of the stranded wire to create a bulge, and a well-shaped, uniform, and beautiful bulge can be created in the length direction of the outer periphery of the stranded wire terminal. By obtaining good shrinkage elasticity (elastically shrinking and producing rebound resilience) of each metal wire, the multi-point contact effect, which is an advantage of the twisted wire terminal, can be enhanced.

In addition, it is sufficient to use a simple metal wire bundle as the material, and it is possible to have a high-density metal wire bundle in the core, ensuring appropriate rigidity of the entire terminal. As a result, a bulge is generated that gradually becomes coarser from the core toward the outer periphery, so that the bulge in the outer periphery becomes firmer and more elastic, ensuring appropriate contact pressure at each point.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1A is a side view of a metal wire bundle as a raw material, FIG. 1B is a front view of the same, FIG. 2 is a side view of a twisted wire bundle, and FIG. Figure 4A is a side view of the twisted wire bundle after untwisting, Figure B is a front view of the same, Figure 5
The figure is a side view of the stranded wire terminal and stranded wire bundle obtained by cutting, Figure 6 is a side view of the stranded wire terminal with a metal bulge formed on the end face, and Figure 7 is a side view of the stranded wire terminal with a metal piece attached. It is a diagram. 1... Metal wire bundle, 2... Metal wire, 3... Twisted wire bundle, 4, 9... Fusion part, 7... Bulge, 10...
Twisted wire terminal.

Claims (1)

[Claims] 1. Twisting a bundle of a large number of metal wires, and untwisting the ends of the bundle of twisted wires less than the amount of twisting to create a rough bulge of metal wire density on the outer periphery; A method for manufacturing a stranded wire terminal, characterized in that the end portion of the stranded wire bundle including the bulge generating portion is cut to a fixed size. 2. The invention as set forth in claim 1, wherein both end surfaces are fused to maintain the rough density bulge.