JPH0436912A - Manufacture of special twisted wire - Google Patents

Abstract

PURPOSE:To eliminate deformation to get a special twisted wire, especially, straight mold twisted wire which can greatly improve workability by applying return in the twisting direction to the special twisted wire premolded with an almost fixed thickness between a premold roll and a mold roll located in front thereof. CONSTITUTION:A bobbin 1 is installed at a cage and wire rods 2 are pulled out of the bobbin, and passed through a collecting plate 3, and led by a mandrel 8 such that they become straight and collected by a collecting die 4, and immediately thereafter, premolded by premolding rolls 5 like a roller. Then, the whole of the wire rods 2 are held in a state of twisted wire molding by plyers and made to pass through main molding rolls 7 while return at 360 deg. is applied to the wire rods 2, and thereafter, they are compressed by the main molding rolls 7, so that the return can be continuously kept and special twisted wires free from deformation can be manufactured.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for producing irregularly shaped stranded wires such as rectangular or keystone stranded wires used in superconducting coils and the like.

[Prior Art] The applicant of the present invention previously developed a manufacturing technology for rectangular shaped stranded wire, in which wire rods sent out from a stranding machine are processed into a collection plate,
We have proposed a technique for obtaining a flat-shaped stranded wire of stable quality that does not easily crumble by sequentially passing through a mandrel, a collecting die, a roller-shaped pre-forming roll, and a main forming roll (see Japanese Patent Laid-Open No. Sho Gi-7510).

[Problems to be Solved by the Invention] By the way, the rectangular stranded wire manufactured by the above technique has the following problems. In other words, in the rectangular shaped stranded wire shown in Fig. 2, if the thickness is T1 and the width is W, then if the value of W/T is 8 to 9 or more, the wire will not be as thick even if a preforming roll is used. There was a problem in that the shape was distorted.

An object of the present invention is to provide a method for manufacturing irregularly shaped stranded wires, particularly rectangular shaped stranded wires, which can significantly improve workability by eliminating the above-mentioned problems and eliminating deformation.

[Means for Solving the Problems] When the present inventors investigated the cause of the deformation of the wire rod in the above-mentioned prior art, they found that a floating phenomenon of the wire rod occurred after pre-forming, and as a result, the deformation of the wire rod occurred. We found that this occurs.

The present invention has been made based on this knowledge, and its gist is that irregularly shaped strands are pre-molded to a substantially constant thickness between a pre-molding roll and a forming roll in front of the pre-molding roll. The first step is to add twist in the direction of twist.

Note that the above twist angle is 30° with respect to the axis of the twisted wire.
The angle is preferably 90° or 180°.
It can be arbitrarily selected such as 360°.

[Function] By adding a twist in the twisting direction to the pre-molded irregularly stranded wire, the twist becomes stiffer, and as a result, the wire does not lose its shape at all, and workability is greatly improved.

[Example] Next, an example of the present invention will be described with reference to FIG.

Attach the hobbin 1 to the cage, pull out the wire 2 from the bobbin 1, pass it through the collecting plate 3, and use the mandrel 8! The wire rods 2 are guided so as to form an angle with L, and immediately after being assembled using a gathering die 4, they are pre-formed using a roller-shaped pre-forming roll 5, and then, in the twisted wire-forming state, the entire wire is held down with pliers and twisted 360°. When the wire is passed through the main forming roll 7 while applying the above-mentioned pressure, and then compressed by the main forming roll 7, the twisted wire is continuously maintained and a deformed stranded wire without deformation can be obtained.

[Effects of the Invention] As described above, according to the present invention, it is possible to completely eliminate deformation of irregularly shaped stranded wires, particularly in a production line for rectangular shaped stranded wires, and to enable efficient production.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing an embodiment of the present invention, and FIG. 2 is a cross-sectional view of a rectangular molded stranded wire taken along line A-A'.

Claims (1)

[Claims] 1. Twisting the preformed irregularly shaped strands in the twisting direction between a preforming roll that preforms the assembled irregularly stranded wires and a main forming roll in front of the preforming roll. A method for manufacturing irregularly shaped stranded wire characterized by: 2. The method for producing a deformed stranded wire according to claim 1, wherein the twist is 30° or more with respect to the axis of the stranded wire.