JPH0214085A - Production of steel cord and apparatus therefor - Google Patents

Abstract

PURPOSE:To obtain the subject apparatus capable of applying specific three kinds of twists with two rotating bodies and twisting a steel cord excellent in performance as a rubber reinforcing material in one step. CONSTITUTION:Several wiry units 1 and 1 on a cradle 3 are simultaneously taken out of one shaft center of a rotating plate 5, rotated around the periphery of the cradle 3 and then repassed through the shaft center of the other rotating plate 5 and led to the outside. The first twist is subsequently applied to the wiry units as a twisted wire group (A). The residual wiry units 1 on the cradle 3 are then passed through the shaft center of the other rotating plate 5, directly taken out and intertwisted with the twisted wire group (A) to apply the second twist to the twisted wire group (B). Furthermore, the twisted wire group (B) and a side element wire 9 are gathered and intertwisted in rotating plates 11 and 11 and the cradle 13 to apply the third twist to the cord. Thereby, a steel cord (C) good in rubber penetrating properties is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for manufacturing steel cords used as reinforcing materials for tires, belts, etc.

(Prior Art) Conventionally, there are two methods for manufacturing this type of steel cord: a method using a cylindrical wire twisting machine (tubular type wire twisting machine) and a method using a double twisting wire twisting machine (puncher type wire twisting machine). The following methods were the basic method, and steel cords with the configurations shown in FIGS. 4(a) to 4(d) were the mainstream. In steel cords with a single-layer twisted structure as shown in Figure 4 ((), (0)), the twisting process is one step, and in other cases, the twisting process is a single layer twisting process as shown in Figure 4 (JT), (, -). Steel cords with twisted or multi-layered twist configurations have been manufactured in multiple steps during the twisting process.

However, recently there have been changes in both the construction and manufacturing methods of these steel cords. In order to improve the quality and performance of the rubber as a reinforcing material, the steel cord has a structure that allows the rubber to penetrate into the inside of the steel cord, specifically, Fig. 5 (A), (III) + ( C)
So-called 1×5 open structure, 2+2 as shown in
There are steel cords that are twisted together with gaps between the strands.

The manufacturing method is to give two types of twists in one process to produce a steel cord, and there are two methods, one of which is the manufacturing method shown in FIG. Fig. 6 shows a recent method for manufacturing steel cords such as 2+2 which has improved rubber penetration, and this is also a manufacturing method that provides two types of twists in one step.

(Problems to be Solved by the Invention) The present invention aims to produce a steel cord that has even better quality and performance as a rubber reinforcing material than these recent steel cords by one-step twisting. With conventional manufacturing methods, it is possible to twist steel cords with two types of twist with good rubber penetration in one step as shown in Figure 6, but this limits the number of strands that can be twisted, and if there are too many, the rubber It tends to be a steel cord with poor penetration. In contrast, the present invention aims to provide a method for manufacturing a steel cord in which steel cord having three types of twists and having a structure with good rubber penetration is twisted in one step.

(Means for Solving the Problems) The present invention uses two rotating bodies, and separates the linear body from both wheel cores of the front and rear rotating plates from a plurality of feeding reels provided on a cradle inside one of the rotating bodies. One of the wires is twisted twice, the other is not twisted, and both of these wires are twisted together to form a twisted wire group, and a linear body provided outside the rotating body is added to this. The steel cord is then introduced into the other rotary body and the steel cord is twisted, completing so-called three types of twisting in one process. In other words, a plurality of reels are arranged on a cradle that is freely suspended inside one of the rotating bodies, and each wire is wound onto several of the reels from one axis of the rotating body. At the same time, the wire bodies are led out, guided around the rotating body, rotated around the cradle and twisted, and guided through the other axis again as twisted wire group A. At the same time, the wire bodies wound on the remaining feeding reel are The stranded wire group A, which has been directly guided through the other axis of the rotating body and has been given the twist, and the linear body are twisted together to form a stranded wire group B. Furthermore, the above-mentioned twisted wire group B and the linear bodies fed out from one or more feeding reels arranged outside the rotating body are gathered together, guided to the other rotating body, rotated around the cradle, and twisted. The present invention provides a method of manufacturing a steel cord that is wound on a feeding cradle.

(Function) Since the present invention consists of the above method, several linear bodies on the cradle are simultaneously led out from one axis of the rotating body, rotated around the cradle, and then passed through the axis of the other rotating body to the outside. The first strand is drawn out as strand group A, and then the remaining linear body on the cradle is directly guided through the other axis and twisted with strand group A to form the second strand into strand group B. strands, and further strand group B,
A third twist can be given to the cord by gathering and twisting the linear bodies fed out from the outside of the rotating body. In other words, steel cords with three types of twist can be manufactured in one process.

(Example) An example of the present invention will be described below based on the drawings. 1st
In the figure, three strands of wire (1) are wound around a rotatably mounted reel (2) and mounted on a cradle (3). Two of the wires pass through the turn roller (4), pass through one axis, pass through the guide roller (6) of the rotating plate (5) of the rotating body A, and rotate around the cradle, giving them a twist. The twisted wire group A is guided to the other axis and twisted twice. The remaining strands (1) are directly led out through the other axis of the rotating body A, and the twisted wire group A
Once twisted, the wires are twisted together to form twisted wire group B.

The stranded wire group B passes through a turn roller (4), a perforated plate (7),
Lead to voice (8). Further, the side wire (9) let out from the reel (2) passes through a turn roller (4), is guided by a batten (7), and is led to a voice (8). Twisted wire group B passing through the voice (8), Tom element vA (91c, rotating body B (71 rotation speed (7)) Over-twisted rollers rotating in the same direction at 1.7 to 2.3 times the rotation speed aω, passes through the axis, passes through the flyer guide ■ of the rotating plate αD, passes through the other axis and is guided into the cradle α ring, where it is twisted twice. The turn roller 00 changes the direction from the axis of the cradle (13+), and the timing belt OS rotates the cradle (13+) in the same direction as the rotating body B, but at a slower speed, that is, 0.8 times the rotation speed of the rotating body B. When the wire r$ is wound several times around the over-twisting roller αe which rotates in front and back and reaches a specified twist pitch, the wire is further twisted to make the twist pinch smaller than the above twist pinch and give permanent strain to the twisted wire. The stranded wire that has left the over-twisted roller 0ω is returned to the specified pinch and is taken up by the take-up capstan aη, and is wound up on the take-up reel α through the traverse roller α to form a multi-layer twisted steel cord. Become.

Next, two wires with a diameter of 0.25 m are twisted together using an S twist so that the twist pitch is 511, and this twisted wire and one untwisted wire with a diameter of 0.25 m are combined. The two linear bodies are twisted in the S twist direction and the twist pinch is 6.7 strands, and the two linear bodies with a diameter of 0.25n+ are twisted in the S twist direction, resulting in a twist pitch of 10 fins. The steel cord C according to the present invention, which is twisted together to form the structure as shown in FIG. 2, and the conventional steel cord C shown in FIG.
The table below shows a comparison of the physical properties with a steel cord having a structure of 5xo, 25, S twist direction and a pitch of 10n.

Compared to conventional products, the steel cord obtained by the present invention has
Rubber penetration rate ((rubber penetration cross-sectional area/rubber penetration possible area)
It is excellent in both the X100't and the apotropic 2 elasticity modulus.

The strands used in the present invention are not limited to all strands of the same diameter, and it is also possible to combine strands of different diameters, and the twisting pitch of each twist can also be changed by changing the rotation speed of the two rotating bodies. It can also be changed freely. Other examples manufactured by the method of the present invention are shown in Figure 3 C).
(Il+), shown in (c). In addition, in this example, 2
The two rotating bodies have the same driving source and are substantially configured as one wire twisting machine, but the manufacturing method of the present invention can also be carried out by combining two double twisting wire twisting machines.

(Effects of the Invention) Since the steel cord manufacturing method and manufacturing device of the present invention have the above-mentioned configuration, three types of twists can be imparted in one twisting process, thereby preventing rubber penetration, which could not be easily manufactured in the past. It is now possible to easily manufacture superior steel cords, etc., and the number of strands constituting the steel cord can be increased as needed.

As shown in FIG. 3, this invention has excellent effects such as being able to easily produce a cord with sufficient rubber penetration in one step.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing an embodiment of the steel cord manufacturing apparatus of the present invention, FIG. 2, and FIG. 3 (A). ([1) and (c) are respectively cross-sectional views of the steel cord obtained by the present invention, and Fig. 4 (a), (■), (c), (
d), Figures 5(a) and 5(c) are cross-sectional views of steel cords produced by conventional manufacturing methods, Figure 5(b) is a front view of conventional steel cords, and Figure 6 is the conventional manufacturing method of steel cords. FIG. 2 is a schematic configuration diagram of the device. (Old...Element wire, (2)...Feeding reel, (3), αto...Cradle, (4), Q4
1.--Turn roller, (5), Qυ...
... Rotating plate, (63, Q21 ... Guide roller, (7) ... Mouth plate, (8) ... Voice, (9) ... Side wire, α0.Oe...
Over-twisted roller, α9...timing belt, 0η
...Take-up capstan, 0 field...Traverse roller, Ql... Winding Figure 2 Figure 3 (A)

Claims (2)

[Claims] (1) having a plurality of feeding reels on a cradle inside one of the rotating bodies, simultaneously drawing out the filament bodies wound on some of the feeding reels of the feeding reels from one axis of the rotating body; The wires are guided around the rotating body, rotated around the cradle, and guided through the other axis as twisted wire group A while being twisted.At the same time, the wires wound on the remaining feeding reel are guided around the rotating body. The stranded wire group A, which is directly guided through the other axis and given the twist, is twisted together with the above linear body to form a stranded wire group B, and further, the stranded wire group B and the stranded wire group B are arranged outside the rotating body. A steel cord characterized in that the linear bodies fed out from one or more feeding reels are collected, guided to another rotating body, rotated around a cradle, twisted twice, and wound on the cradle. manufacturing method. (2) In a steel cord manufacturing apparatus provided with two rotating bodies, one of the rotating bodies includes a freely suspended cradle in which a plurality of payout reels are arranged;
There is also a guide that guides the linear body wound on the above-mentioned feed reel through one axis, guides it around the rotating body, and guides it through the other axis, and a guide that guides the linear body directly from above the cradle through the other axis. and a guide for introducing a linear body from the outside into the other rotating body and guiding it around the rotating body onto the cradle, and a winding section for winding the steel cord onto the cradle. Steel cord manufacturing equipment featuring: