JPH09188982A - Production of element wire for steel cord - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an element wire for a steel cord having excellent adhesion with rubber by making a thin film thickness of metal plating applied on a peripheral part of welding of an element wire. SOLUTION: This invention is a method of finishing an element wire W for a steel cord by drawing a wire rod applied of brass plating by subjecting to plural wire drawing processes and a length of the element wire W before the last wire drawing process is measured. When the length is shorter than a standard length, an end of the element wire W is jointed with the same type of element wire W in the shortened length by welding and brass plating is applied on the welding peripheral part R wherein the plating is peeled off with the welding, and the element wire W is repaired. Then, a series of the element wire W is drawn by subjecting to the last wire drawing process.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a method of manufacturing strands for the construction of steel cords.

[0002]

2. Description of the Related Art In general, steel cords are brass-plated wire rods with a diameter of 0.7 to 2.0 mm that are passed through the wire drawing process multiple times, and finally finished into strands with a diameter of 0.1 to 0.4 mm. A plurality of such strands are put on a twisting machine and twisted together.

In recent years, in order to improve the manufacturing efficiency of steel cords, a large bobbin is used for winding the wire after drawing, and a large amount (length) of this large bobbin is used. The strands are wound up, and a plurality of these large bobbins are arranged on the raw material supply side of the twisting machine so that the strands are fed out from these large bobbins to the twisting machine.

[0004]

However, if a huge bobbin is used to wind an enormous amount of wire, even if the length of the raw material wire is controlled, it will be The length may change for each wire, and as a result, there may be a bobbin wound with a wire shorter than the specified length. In addition, due to a trouble wire break during the wire drawing process, a bobbin in which a wire shorter than a prescribed length is wound may occur.

When a bobbin having a wire length shorter than such a regulation is carried into the raw material supply side of the twisting machine and twisted, the bobbin becomes empty in the middle of the process and the bobbin needs to be replaced. However, even if another bobbin is wound with a huge amount of wire, continuous operation is hindered, and improvement in manufacturing efficiency cannot be realized.

Therefore, when the length of the wire that has undergone the wire drawing process is shorter than the specified length, a wire having a required length is welded and connected to the end of the wire so that the total length becomes the specified length. doing.

However, the steel cord wires are brass-plated on the surface thereof to enhance the adhesiveness with rubber. Therefore, when welding is performed, plating of the peripheral portion including the welded portion is performed. The layers peel off. Therefore, it is conceivable to re-plat and repair the portion around the weld.

However, in the case of plating the steel cord for the steel cord, good adhesion to rubber cannot be obtained unless the thickness is made extremely thin. The wire for steel cord is plated before drawing, and the plated layer is extended in the subsequent drawing process, resulting in an extremely thin film thickness, which improves adhesion with rubber. .

Therefore, if the wires are welded and joined together after the wire drawing is completed, and the portions around the weld are re-plated, the film thickness cannot be reduced, and the steel that is inadequate in terms of adhesiveness with rubber is used. It becomes a bare wire for the code.

The present invention has been made by paying attention to such a point, and an object thereof is to reduce the thickness of the plating applied to the welding peripheral portion of the wire so as to obtain good adhesiveness with rubber. An object of the present invention is to provide a method for manufacturing the obtained steel cord wire.

[0011]

In order to achieve such an object, the present invention provides a method for drawing a brass-plated wire rod in a wire drawing step to finish the wire for steel cord. Measure the length of the wire before applying it to the wire drawing process, and when the length is shorter than the specified length, use the same length of wire as the required wire at the end of the wire for the required length. Welding and joining, brass plating is applied to the welding peripheral part of the part where plating is peeled by the welding, and after that, the above-mentioned series of wires is drawn into a wire for steel by drawing wire. It was designed to be finished.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. When manufacturing a wire for steel cord, first, for example, the diameter of 2.
A 5 mm wire is used and the wire is heat treated and then the surface of the wire is brass plated.

Thereafter, as shown in FIG. 1, the wire is subjected to a first wire drawing step A1 to draw a wire having a diameter of, for example, 1.0 to 1.5 mm, and the wire is wound by a bobbin B1. When this bobbin is wound on the bobbin B1, the length of the wire is measured by the length measuring device C.

If the measured length of the wire is a prescribed length, the wire wound by the bobbin B1 is carried into the second or final drawing process A2, and this wire drawing is performed. Process A2
In the above, the wire is drawn to, for example, about 0.2 to 0.4 mm, and this wire is wound by the bobbin B2.

When the length of the wire is shorter than the prescribed length during the length measurement in the first wire drawing step A1, the bobbin B1
At the end of the wire wound in, weld the wire of the required length for the shortage and connect it. The strands to be connected are the same as the strands wound on the bobbin B1.

When the strands are welded, the plating layer at the weld peripheral portions of the strands is peeled off by the heat of the welding process, so that the stripped weld peripheral portions are next subjected to repair plating. The plating apparatus shown in FIG. 2 is used for this repair plating. This plating apparatus is equipped with a hand-held plating rod 1. This plating rod 1 has an anode rod 3 attached to a handle 2.
The anode rod 3 is covered with an impregnating member 4 made of cloth or sponge.

In FIG. 2, W is a welded wire, and R is a repaired part to be plated around the welded part. When applying plating, the repairing part R
The burrs and oxides of the welding generated at 1 are removed using sandpaper or the like, and the repaired portion R is degreased with a degreasing liquid.

Next, the impregnated member 4 of the plated rod 1 is impregnated with copper pyrophosphate as a plating liquid, the anode rod 3 is connected to the positive terminal of the rectifier 5, and the negative terminal of the rectifier 5 is connected via the clamp 6. Connect to the wire W.

In this state, the plated rod 1 is held by hand and the impregnated member 4 is brought into contact with the surface of the repaired portion R. As a result, an electric current flows from the anode rod 3 to the wire W, copper ions are attached to the surface of the repaired portion R with which the impregnated member 4 contacts, and a copper (Cu) plated layer is formed.

In this way, the impregnated member 4 of the plated rod 1 is sequentially contacted so as to be scattered over the entire surface of the repaired portion R, and the entire surface is first made of copper, as shown in FIG. The plated layer M1 is formed uniformly.

Next, the impregnated member 4 of the other plated rod 1 is impregnated with zinc sulfate as a plating solution, the anode rod 3 is connected to the positive terminal of the rectifier 5, and the negative terminal of the rectifier 5 is connected via the clamp 6. Connect to the wire W.

Then, the impregnated member 4 is brought into contact with the copper plating layer M1 in the repair portion R. As a result, a current flows from the anode rod 3 to the wire W, and zinc ions are attached to the plating layer M1 with which the impregnating member 4 contacts to form a zinc (Zn) plating layer.

In this manner, the impregnated member 4 of the plated rod 1 is sequentially contacted so as to be scattered over the entire copper plated layer M1 and the entire surface thereof is coated with the zinc plated layer as shown in FIG. M2 Form uniformly.

Next, the plating layers M1 and M2 are heated by energizing and heating by passing a current through the wire W in the section of the repair section R. By this heating, the copper of the plating layer M1 and the plating layer M2 are
Zinc diffuses and the plating layer on the repaired portion R becomes brass plating.

After brass-plating the repaired portion of the wire in this manner, the connected wire portion is bobbin B.
The bobbin B1 is wound around 1 and the final drawing process A2
Carry in. Then, the wire is unwound from the bobbin B1, drawn in the final drawing process A2, and wound by the bobbin B2.

At the time of this wire drawing, the welded portion, the repaired portion, and the plated layer of brass plating are extended together with the entire wire. Then, by extending the plating layer of brass plating, the plating layer has an extremely thin film thickness, that is, a film thickness at which good adhesion with rubber can be obtained.

By manufacturing the strands for steel cords in this manner, the strands of the specified length can be obtained. Then, a plurality of bobbins wound with this wire are placed on the raw material supply side of the twisting machine together with other bobbins with wound wires of a specified length, and the wires are respectively fed from these bobbins. A steel cord is manufactured by twisting the strands with a twisting machine. According to this process, an empty bobbin does not occur in the middle of the process, and therefore the bobbin does not need to be replaced, and the manufacturing efficiency is improved.

Also, in the case of the strands that are connected by welding and the brass plating for repair is applied to the peripheral portion of the welds, the brass plating is extended to an extremely thin film thickness by the final drawing process. Therefore, good adhesion with rubber can be obtained.

In the above embodiment, the wire rod is
Although the wire having a predetermined diameter is finished by performing the wire drawing process once, the wire may be drawn by performing the wire drawing process three times or more, or the wire having the predetermined diameter may be formed by only one wire drawing process. It may be a case of finishing into a wire.

[0030]

As described above, according to the present invention,
Since the thickness of brass plating applied to the welded area of the wire is made thin by using the subsequent wire drawing process, it is necessary to manufacture the wire for steel cord with good adhesion to rubber. You can

[Brief description of the drawings]

FIG. 1 is an explanatory diagram for explaining a wire drawing process according to an embodiment of the present invention.

FIG. 2 is an explanatory view for explaining a plating means according to the embodiment of the present invention.

FIG. 3 is an enlarged sectional view showing a plating layer formed by the plating means.

[Explanation of symbols]

 A1, A2 ... Wire drawing process 1 ... Plating rod W ... Element wire R ... Repair part M1 ... Copper plating layer M2 ... Zinc plating layer

Claims (2)

[Claims] 1. A method for finishing a brass-plated wire rod in a plurality of wire-drawing steps to finish it into a wire for a steel cord, the length of the wire before being subjected to a final wire-drawing step. When the length of the wire is shorter than the specified length, the end of the wire is welded with the same wire as the wire for the required length, and the welding results in plating. A method for producing a wire for steel cord, which comprises performing brass plating on a portion around a welded portion of the peeled portion to repair the wire, and then drawing the series of wires in a final wire drawing step. 2. A method for finishing a brass-plated wire rod in a wire drawing process to finish it into a wire for steel cord, wherein the length of the wire before the wire drawing process is shorter than a prescribed length. At the same time, at the end of the wire, the same wire as the wire is welded and connected for a required length, and brass plating is applied to the welding peripheral part of the part where the plating is peeled off by the welding, and repaired,
After that, the above-mentioned series of wires is drawn in a drawing process, and a method for manufacturing a steel cord wire.