JPH0541119A - Manufacture of shielded electric cable for pressure connection - Google Patents

Abstract

PURPOSE:To improve processibility of products and shield property by installing a large and a small arcs as a semi-triangular tape guide and a guide for prevention of wire rampage in the exit cross-section of a metal tape pre-forming jig. CONSTITUTION:A guide hole having a metal tape preforming jig exit side hole 62 is formed in the exit side of a metal tape preforming jig 6 and products having stable shielding properties are obtained by extrusion forming while improving processability. Since the tape end sides are on different level by a tape guide, the tape end sides keep a constant piling way and thus the shielding is surely maintained. Also, an insulated conductor wire guide and a drain wire guide are installed, so that disorder of the metal tape due to rampage of the wire is prevented and the forming in the longitudinal direction is maintained and the pitch between wires becomes stable.

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 shielded wire for pressure welding, and more particularly to a method for manufacturing a shielded wire for pressure welding using a preforming jig having an improved hole shape.

[0002]

2. Description of the Related Art FIG. 3 is an example of a cross-sectional view of a conventionally manufactured shield wire for pressure welding. In FIG. 3, 1
Is a drain wire, 2 is an insulated wire, 3 is a shield tape,
7 is a sheath. As shown in FIG. 4, the shield tape was formed by preforming the tape through at least one preforming jig 4 and immediately after that through the main forming jig 5.

As shown in FIG. 5, the preforming jig 4 is
The entrance cross section 4 ₁ was a semicircle, and the exit cross section 4 ₂ was a spiral tube, which was shaped so as to prevent defects in the shield that would occur due to collision of the ends of the tape.

[0004]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention As shown in FIG.
In the conventional method, the exit cross section 4 ₂ of the preforming jig 4 is a tube provided with only a tape guide, and there is no guide for the insulated conductor 2 and the drain wire 1. Therefore, the insulated conductor 2 and the drain wire 1 are placed inside the tube. It fluctuates vertically and horizontally, and as a result, the tape molding state after extrusion is deformed in the longitudinal direction and becomes non-uniform.

Further, since the tape guide is curved, the position of the tape wrap in the product, that is,
It was extremely difficult to calculate in advance the distance L from the center of the drain wire 1 to one end of the tape.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned drawbacks of the prior art and to provide a pressure-shielded shielded electric wire having a uniform shield characteristic and a tape-molded state over the entire length of the product.

[0007]

The gist of the present invention resides in that a pseudo-triangular tape guide and large and small arcs are provided as a guide for preventing the line deviation in the exit cross section of the metal tape preforming jig. By forming the tape through the jig, the workability of the product and the stability of the shield property can be improved.

The metal tape preforming jig may be made of metal.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described below with reference to FIGS.

FIG. 1 is a sectional view of the outlet hole shape of the metal tape preforming jig of the present invention.

In FIG. 1, W is an insulated conductor side tape guide, W'is a drain wire side tape guide, D is an insulated conductor side tape guide hole diameter, D'is a drain wire side tape guide hole diameter, and θ is an insulated conductor side tape collapse. The angle, θ ′ is the tape tilt angle of the drain wire side, t is the minimum width between the tape guides, T is the width of the slit portion, and P is the distance between the insulated conductor and the drain wire.

FIG. 2 is a schematic view showing the shapes of the inlet surface and the outlet surface of the metal tape preforming jig of the present invention. In FIG. 2, 6 is a metal tape preforming jig of the present invention, 6 ₁ is a sectional shape of a jig inlet hole, and 6 ₂ is a sectional shape of a jig outlet hole. That is, 6 ₂ forms the cross section of FIG.

In FIG. 1, the width of the metal tape is 13 mm,
2 mm with a thickness of 0.016 mm and an insulated wire with an outer diameter of 0.96 mm and a drain wire with an outer diameter of 0.38 mm
In the case of wrapping with a wire pitch of, the insulated wire guide hole arc φD is 1.1 mm, the drain wire guide hole arc φD ′ is 0.52 mm, θ = 30 °, θ ′ = 60 °,
It was confirmed that when W = 3.3 mm and W ′ = 3.3 mm, the metal tape preforming was sufficiently possible.

By changing the values of W and W ', it is possible to stack tapes at arbitrary positions.

As shown in FIG. 2, if a tape guide hole having the above-mentioned size is formed on the exit surface of the metal tape preforming jig and extrusion molding is performed, the workability is improved and the shield characteristics are stabilized. The product can be easily obtained.

In the present invention, since the tape end portions are stepped by the tape guides W and W ', the tape end portions can maintain a certain overlapping manner and guarantee the shield. Further, since the insulated wire guide and the drain wire guide are provided, it is possible to prevent the disorder of the metal tape due to the irregularity of the wire, keep the molding in the longitudinal direction, and stabilize the pitch between the wires.

The distance t between the tape guides in FIG.
T = 1.0 mm ± 0.3 mm is the minimum thickness of the metal material required to support the pseudo-triangular portion.

[0018]

According to the present invention, it is possible to provide an excellent shielded wire for pressure welding, which has a uniform shield characteristic and a stable tape-molded state over the entire length of the product.

Further, this can be expected to improve the product yield.

[Brief description of drawings]

FIG. 1 is a sectional view of an outlet hole shape of a metal tape preforming jig according to an embodiment of the present invention.

FIG. 2 is a schematic view showing shapes of an inlet surface and an outlet surface of a metal tape preforming jig according to an embodiment of the present invention.

FIG. 3 is a cross-sectional view of a typical shield wire for pressure welding.

FIG. 4 is an explanatory view of a method for manufacturing a conventional shielded electric wire for pressure welding.

FIG. 5 is a schematic view showing shapes of an inlet surface and an outlet surface of a metal tape preforming jig of a conventional example.

[Explanation of symbols] 1 drain wire 2 insulated conductor 3 metal tape 4 metal tape preforming jig 4 ₁ metal tape preforming jig inlet face hole shape 4 ₂ metal tape preforming jig outlet face hole shape 5 metal tape main forming jig Tool 6 Metal tape preforming jig of the present invention 6 ₁ Metal tape preforming jig of the present invention inlet face hole shape 6 ₂ Metal tape preforming jig outlet face hole shape of the present invention 7 Insulator (sheath)

Claims (2)

[Claims] 1. A method of manufacturing a shielded electric wire for pressure welding, comprising forming a drain wire and a plurality of insulated conducting wires by a vertical attachment method of a shield tape, wherein the shield tape has at least a hole type for a tape guide and a hole type for a drain wire. A method for producing a shielded wire for pressure welding, which comprises performing main forming after passing through a preforming jig provided with. 2. The method for producing a shielded wire for pressure welding according to claim 1, wherein the tape guide hole die of the preforming jig is asymmetrical.