JPS59635B2 - Steel cordono Seizouhouhou - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a two-layer, three-layer or more-layer steel cord having a core strand consisting of a plurality of strands.

Conventionally, when manufacturing a steel cord having a core strand, a wire twisting machine such as a cage type wire twisting machine or a cylindrical wire twisting machine is used.

However, these wire twisting machines have disadvantages in that the device is thick, the number of revolutions is small, and the power used is large.

Recently, in steel cord manufacturing equipment, the rotation speed is high,
Double-twist buncher hot wire machines, which use less power, have come to be adopted, but if the puncher twister described above is used as is to manufacture steel cord for multi-layer twisted tiles, due to its structure, all the valley wires are rotated. Twisting occurs depending on the

As a result, when the core strand is twisted, the twist pitch changes, which causes uneven twisting and poor twisting in the cord, reducing the quality of the steel cord.

For this reason, in consideration of twisting or untwisting the core strand, give it a little more or less twist in advance and twist it with the side line.
A method of manufacturing a steel cord with a core strand of a specified twist pitch has been considered, but even in this method, the twist pitch changes during the twist formation, which causes significant damage to the core strand. Furthermore, it is not possible to eliminate the occurrence of twist defects, which causes deterioration in the quality of the steel cord.

For example, the twist pitch of the core strand is 101ftrf.
In order to twist a steel cord with an L1 cord twisting pitch of 1871Lm using a puncher twisting machine, if the steel cord has an S/S twist structure, the core strand must be twisted in advance with a twisting pinch of 22.5 mm, and the S/S In the /Z twist structure, it is necessary to twist the core strand to a 6.4 mm twist pinch in advance.

In this way, when the twist pinch of the core strand itself and the twist pitch when it becomes part of the steel cord change drastically, the length of the strand naturally changes due to the difference in twist rate. If this phenomenon occurs while the twist is being formed, length unevenness will occur between the core strand and the side wire, resulting in defects such as so-called twist unevenness, kink failure, and wire breakage.

The present invention has been made in view of the conventional drawbacks,
In particular, it is an object of the present invention to provide a method for producing high-quality steel cords, especially tire cords, which are free from uneven twisting and kinks even in multi-layer twisted steel cords.

An embodiment of the present invention will be described below based on the drawings.

Embodiment As shown in FIG.
The core strand 4 is passed through a guide roller 19 provided on the flyer 18, and further passed through the center of the end plate 11 while being twisted in the S direction, and guided to the voice 12.

On the other hand, if it is rotatably fixed to the machine frame or the ground,
A plurality of side wires 5 which have been wound up are aligned and guided through a turn roller 10 to an end plate 11 and a voice 12.

A plurality of core strands 4 and side strands 5 coming out of the voice 12 are false-twisted through over-twisting rollers 13, then guided to guide rollers 9 provided on a flyer 8 of the puncher twisting machine body, and twisted by 80 revolutions of the flyer. The twisted wires are twisted in the Z direction and the twisting pitch is 18 mm, and the twisted wires are false-twisted again using another over-twisting roller 22 installed in the cradle 7 of the puncher twisting machine body, and then collected. It is taken up by the capstan 14 and wound up on the take-up reel 3 via the traverser 15, for example,
0, twist direction S/Z, twist pitch Io
A steel cord of n/18 mm is obtained.

Here, the core strand 4 with the twist direction S is attached to the flyer 18.
However, in reality, the core strand 4 is continuous between the flyer 18 and the flyer 8. 18 and the flyer 8 are close to each other, the untwisting body 4 generated by the rotation of the flyer 80 is transmitted to the flyer 18, resulting in a phenomenon in which the strands 4 are not twisted or untwisted during operation.

In the above apparatus, it is most preferable that the fryers 8 and 18 are rotated in the same direction and at approximately the same rotational speed by drive gears 16 and 20 transmitted from the same drive source or separate drive sources.

In the above device, the rotation of the over-twisting rollers 13 and 22 is such that the outer over-twisting roller 13 rotates in the same direction as the main body of the wire twisting machine, and the rotation speed is approximately twice that of the main body. The rotation speed should be around 90% of the main body rotation speed.

By the way, as a gathering device for core strands and side wires,
Although the end plate 11 and the voice 12 were used, as shown in Fig. 2,
Instead of the above device, a twisting roller 21 may be used.

When producing steel cord by the method of the present invention, the twist of the core strands 4, which would have been restored by the rotation of the flyer 8 in the conventional method, is canceled out by the rotation of the flyer 18, and the twist pitch of the core strands 4 is changed. Without changing the wires, the assembled wires are twisted by the over-twisting roller 13 into the finishing twist pitch, passed through the main body as it is, and finally twisted again by the over-twisting roller 22. By twisting, the twisted pinch of the core strand does not change even after it becomes a cord.
Of course, even during the twisting process, the required steel cord can be obtained with almost no change in the twist pitch.

Next, Table 1 shows comparative examples of steel cords manufactured by the method of the present invention and steel cords manufactured by the conventional method.

Therefore, when manufacturing S/Z twisted steel cord according to the present invention, since the core strands are twisted in advance by rotation of the flyer 18, the untwisting is canceled and the twisting of the core strands is The pitch does not change even after becoming a steel cord, and of course the twisting pinch hardly changes during the twisting process, so there is no length unevenness between the core strand and the side wire.
A steel cord with no uneven twists or kinks can be obtained.

Moreover, over-twisting rollers are placed both outside and inside the twisting machine to manufacture the required steel cord, so there is no need for gaps to form in the core strands or for the core strands to protrude outside the side wires. Because there is no twist, there is no uneven twisting.
Moreover, even when manufacturing a steel cord by constructing a side strand using a large number of side strands with small wire diameters, since the steel cord is overtwisted, it is easy to obtain a steel cord of uniform quality without kinks. This invention has the great effect of making it possible to

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, FIG. 1 is a block diagram of a steel cord manufacturing apparatus, FIG. 2 is a block diagram showing another embodiment of the collecting device in FIG. 1, and FIG. FIG. 1 is a configuration diagram showing a steel cord obtained by the method of the present invention. 1.2...Reel, total...Take-up reel,
4... Core strand, 5... Side wire,
6...Steel cord, 7,17...
Cradle, 8, 18... Flyer, 9, 19
...Guide roller, 10 ...Tongue roller, 11 ...End plate, 12 ...Voice,
13゜22... Over-twisting roller, 14...
Pick-up capstan, 15...Traversa, 1
6, 20... Drive gear, 21... Twisting roller.

Claims (1)

[Claims] 1. A reel wound with a plurality of core strands is rotatably mounted in a cradle that is freely suspended on the machine frame, and the core strands are twisted from the reel via a flyer that rotates around the cradle. Over-twisting, in which the twisted core strand and the plurality of single wires constituting the side wires are rotated in the same direction at a rotation speed of 1.5 to 3 times the rotation speed of the flyer. The flyer is guided to a roller and further rotates in the same direction and at approximately the same rotation speed as the fryer, and has a rotation speed of 0.7 of the rotation speed of the fryer.
A method for manufacturing a steel cord, characterized in that the steel cord is supplied to a buncher twisting machine equipped with over-twisting rollers rotating in opposite directions at a rotation speed of ~10 times, thereby obtaining a steel cord having a core strand.