JPH0679746B2 - Stranding method for wires with irregular cross section - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to a method for twisting a deformed cross-section element wire having a large repulsive force without causing residual stress.

[Technical background of the invention and its problems] Generally, when twisting a wire having a large repulsive force made of steel or high-strength aluminum (for example, No. aluminium), residual stress is generated and untwisting phenomenon occurs at the time of cutting. In order to prevent the occurrence of the above, a twisting machine of a tubular type or a planetary type is usually used for twisting while twisting each strand.

On the other hand, when twisting irregularly shaped cross-section wires of ordinary fan or trapezoidal cross section that do not have very high tensile strength, converge these wires in close contact with each other so that the cross section is round at the twisting port. Therefore, the strands of these modified cross-sections are twisted by a rigid type twisting machine that does not twist them.

However, when twisting a deformed cross-section wire made of steel or high-strength aluminum with a large repulsive force using a rigid type twisting machine that does not twist the wire back, the repulsive force of the wire causes There was a problem that laughter occurred and it was not possible to obtain a tight twisted wire between the wires.

A two-point type preformer that imparts twisting behavior to a modified cross-section element wire is also known, but a known two-point type preformer imparts the required twisting behavior to a modified cross-section element wire having such a large repulsive force. Is impossible.

[Object of the Invention] The present invention has been made to solve such a problem, and an object of the present invention is to provide a method for tightly twisting a deformed cross-section wire having a large repulsive force without causing residual stress. To do.

[Summary of the Invention] When twisting a plurality of modified cross-section strands while closely contacting each other in a layered manner, each modified cross-section strand is guided to restrain the rotation of the strands arranged at intervals in the respective traveling directions. A pair of rolls provided with grooves are sequentially passed in a state of being twisted in the same direction as the twisting direction, and each strand is given a twisting in the same direction as the twisting direction. Is a method of twisting strands of irregular cross-section for converging and twisting, wherein the interval between the pair of rollers is shorter than the twisting pitch of the strands, and the twisting angle of the strands by these rollers is The feature is that it is set at 180 ° in the same direction as the twisting direction.

[Examples of the Invention] Examples of the present invention will be described below with reference to the drawings.

In the twisting machine used in this embodiment, as shown in FIG. 1, each of the plurality of modified cross-section strands 1 is placed in each passage so that each of the modified cross-section strands 1 is twisted in the twisting direction. A twist preformer 2 for twisting and twisting is attached to the eye plates B and B '.

Each twist preformer 2 is composed of a pair of die-type rolls 3 and 3 ′ which are arranged at a predetermined distance a from each other along the traveling path of the respective modified cross-section strands 1.

These die type rolls 3 and 3'are shown in FIGS.
As shown in the drawing, each has a guide groove r for restraining the rotation of the deformed cross-section strands 1, and is 18 in the circumferential direction.
It is installed in a positional relationship that is offset by 0 °.

The distance a between the die rolls 3 and 3 ′, that is, the twist pitch a, is the most obtained twisted wire shape ratio when the relationship of a = 0.5 to 0.6P holds with the twist pitch P. It is difficult for the wires to come apart.

Further, when the relationship between a and P is constant, the smaller the twist pitch, the more difficult it is for the obtained twisted wire to come apart.

Next, the twisting method of the present invention using this twisting machine will be described.

As shown in FIG. 1, a plurality of fan-shaped or trapezoidal-shaped deformed cross-section wires 1 made of, for example, high-strength aluminum, which are sent out from a plurality of delivery bobbins (not shown), are respectively twist preformers 2 Through which the twist in the same direction as the twisting direction is continuously imparted.

A plurality of deformed cross-section strands 1 thus twisted
Is converged through a twisting port 4 installed at a position where each wire is most easily accommodated, and is then sent to a winding bobbin (not shown).

The take-up bobbin is mounted on a rotary frame so as to be rotationally driven in the take-up direction, and the irregular cross-section strands 1 that are converged by this rotation are taken up.

The twisted wire 5 thus obtained has twists in the same direction as the twisting direction preliminarily imparted to each of the modified cross-section strands 1, so that no laughter occurs and a twisting phenomenon occurs at the time of cutting. Nothing.

In the case where a twisted preformer 2 alone is not sufficient in shaping when producing a stranded wire having a multi-layered structure, a conventional two-point preformer may be used together.

[Effects of the Invention] As described above, according to the method of the present invention, it is possible to closely twist deformed cross-section wires having a high repulsive force without causing laughter or separation.

Further, the method of the present invention is relatively easy to work, does not require skill, and has good workability.

[Brief description of drawings]

FIG. 1 is a side view for explaining an embodiment of the present invention, and FIGS. 2 and 3 are enlarged sectional views taken along the lines II-II 'and III-III' in FIG. 1, respectively. 1 …… Varied cross-section wire 2 …… Twisted preformer 3, 3 '…… Die type roll 4 …… Twisting port 5 …… Twisted wire

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Claims (3)

[Claims] 1. A guide for restraining the rotation of each of the odd-shaped cross-section strands when the plural odd-shaped cross-section strands are twisted while closely contacting each other in a layered manner, with each of the odd-shaped cross-section strands arranged at intervals in their traveling direction. A pair of rolls provided with grooves are sequentially passed in a state of being twisted in the same direction as the twisting direction, and each strand is given a twisting in the same direction as the twisting direction. A method of twisting wires of irregular cross-section by converging and twisting, wherein the interval between the pair of rollers is shorter than the twisting pitch of the wires, and the twist angle of the wires by these rollers is A twisting method for strands of irregular cross section, characterized in that the twist direction is 180 ° in the same direction. 2. The method for twisting a modified cross-section wire according to claim 1, wherein the modified cross-section wire is a fan-shaped or trapezoidal cross-section wire. 3. The method for twisting a modified cross-section strand according to claim 1 or 2, wherein the modified cross-section strand is an aluminum wire.