JPH079192A - Wire drawing method and apparatus for manufacturing welding wire - Google Patents

Abstract

(57) [Summary] [Structure] During the secondary wire drawing process in the production of welding wires, that is, when thinning the copper-plated steel wire to the diameter of the product, the water-soluble lubricant liquid immersed in the wire drawing die is removed. After that, solid-liquid separation is performed using a liquid cyclone, purification is performed to remove floating copper powder, and the product is recycled. [Effects] The lubricating liquid can be used for a long period of time, the bath and its closing process can be easily treated, and the cost can be reduced. The amount of copper powder that adheres to the product wire decreases,
Problems such as clogging of the feeding chip are also reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a technique for drawing a copper-plated steel wire for producing a welding wire. According to the present invention, it becomes possible to use a water-soluble lubricating liquid as a lubricant for wire drawing for a long period of time.

[0002]

2. Description of the Related Art The essential wire drawing (secondary wire drawing) step in the production of welding wires is typically 3.3 mm in diameter by cold drawing (primary wire drawing) and then copper plated steel wire is used. In this process, a wire is drawn through a multi-stage wire drawing die immersed in a lubricating liquid, and the diameter is usually about 1.2 mm.

As the lubricating liquid, what is generally called a water-soluble lubricant is used in the form of a water emulsion.

Since this lubricating liquid gradually becomes dirty as it is used, it must be renewed at regular intervals.
If you continue to use dirty lubricant, the surface of the product wire will be dirty and not only will the product value be low, but also the wire feed tip of the automatic welding machine will be clogged due to deposits.

Therefore, the management of the lubricating liquid is generally carried out by the amount of copper ions in the liquid, and is usually renewed when the amount reaches 0.5%. However, since the waste lubricating liquid contains harmful substances, it is expensive to process and dispose of it, and the lubricating liquid itself is not cheap. Update accounts.

[0006]

The object of the present invention is to enable such a lubricating liquid to be used for a longer period of time, to improve the efficiency of use of the lubricating liquid and to reduce the need for its disposal, and to reduce the manufacturing cost of the welding wire. To reduce
And to provide environment-friendly wire drawing technology.

[0007]

The wire drawing method of the present invention comprises the steps of drawing a copper-plated steel wire for manufacturing a welding wire in a lubricating liquid of a water-soluble lubricant through a multi-stage drawing die. Collect the lubricating liquid from the wire drawing tank in which the die is immersed,
The solid-liquid separation means separates and removes solid suspended matter mainly composed of copper powder in the lubricating liquid to purify the lubricating liquid, cools the purified lubricating liquid, circulates it in the wire drawing tank, and reuses it. And

As the above-mentioned solid-liquid separating means, various filtration devices are of course useful, but it is practically recommended to use a liquid cyclone.

The apparatus of the present invention for carrying out this method is a wire drawing apparatus for drawing a copper-plated steel wire for producing a welding wire, and comprises a multi-stage wire drawing die (7) as shown in FIG. Wire drawing tank (2) to be used by immersing it in a lubricating liquid (1) of a water-soluble lubricant, recovery liquid tank (3) for storing the lubricating liquid recovered from the wire drawing tank, suspended solids in the recovered lubricating liquid The liquid cyclone (4) for separating the cleaning liquid to purify the lubricating liquid, the cleaning liquid tank (5) for storing the purified lubricating liquid, and the heat exchanger (6) for cooling the lubricating liquid in the cleaning liquid tank. It is characterized in that it is provided with a pipe and a pump for circulating the above-mentioned lubricating liquid.

[0010]

With the wire drawing, the metal powder mainly composed of copper plated on the steel wire in the die and containing a small amount of iron is peeled off and accumulated in the lubricating liquid. It was thought that the concentration of copper ions in the lubricating liquid was determined by a factor other than the increase in the solid content concentration, but based on the experience of the inventors, it was found that it is proportional to the increase in solid suspended matter. It was

Therefore, by removing the metal powder composed mainly of copper powder from the lubricating liquid by a solid-liquid separating means such as a hydrocyclone, physical and chemical contamination of the lubricating liquid, that is, reduction of solid suspended matter and It is possible to control the amount of dissolved copper ions.

By using an appropriate liquid cyclone currently in practical use, it is possible to almost completely remove solids having a sphere-equivalent diameter of 40 μm or more in the lubricating liquid.

It goes without saying that the lubricating liquid in the cleaning liquid tank is cooled, because the temperature of the lubricating liquid rises in the wire drawing tank due to the heat generated during processing.
This is because the temperature is maintained at -50 ° C and at most 60 ° C or lower. Therefore, cooling by heat exchange may be performed on the liquid in the cleaning liquid tank or may be performed on the lubricating liquid returning to the wire drawing tank.

[0014]

EXAMPLE A copper-plated steel wire for welding wire having a diameter of 3.3 mm was continuously passed through a 12-stage die in a wire drawing tank to have a diameter of 1.2 mm.

As the lubricating liquid, a stock solution of a commercially available water-soluble lubricant was diluted 5 times to make a total amount of 10 to 13 m ³ . This lubricant is an oil emulsion and has a pH of 8.0 to 10.0.

The liquid cyclone has a body made of plastics and a lower sludge discharge part made of ceramics,
Sixteen small ones having a total height of about 300 mm and a processing capacity of 60 to 70 liters / min were used in parallel.

The particle size distribution of the copper powder in the lubricating liquid was as shown in FIG. 2 in the conventional usage without purification, but changed as shown in FIG. 3 by the use of the liquid cyclone. In FIG. 3, as described above, almost no relatively large-diameter particles having a diameter of 40 μm or more remain. The number of small-diameter ones is increasing, but it is thought that this is because when passing through the cyclone, the metal powder formed by agglomeration of fine powder is divided into smaller diameters. Even so, the total number of metal powders is reduced to about 1/3.

When a large amount of wire drawing was performed after the bath was built, the concentration of copper ions in the lubricating liquid was conventionally increased as shown in FIG. 4, so that the control value was 0.5% when the drawing amount was 600 tons or less. Had reached. According to the present invention, since the slope of increase is small as shown in FIG. 5, even if the control value is lowered to 0.4%,
It can withstand over 1000 tons of wire drawing and continue to be used.

[0019]

According to the present invention, the amount of the copper powder floating in the liquid is always maintained by extracting and purifying the lubricating liquid of the water-soluble lubricant used in the wire drawing process of welding wire production and circulating it. It is suppressed to a certain low level, and the rate of increase of the concentration of copper ions in the liquid is significantly reduced.

The fact that the amount of copper powder in the lubricating liquid is suppressed and the large-diameter powder disappears means that the amount of copper powder that adheres to the surface of the welding wire, which is a product, causes clogging of the wire feeding tip, etc. It is possible to provide a high-quality welding wire which is easy to use because the welding wire is significantly reduced.

The suppression of the increase of the copper ion concentration in the liquid means that the life of the lubricating liquid is remarkably extended and that the cost required for renewal, that is, the sum of the bath cost and the waste liquid treatment cost is reduced. It realizes the manufacturing of welding wire in consideration of the environment as well as the cost reduction.

[Brief description of drawings]

FIG. 1 is a conceptual diagram showing a configuration of a wire drawing device of the present invention.

FIG. 2 is a bar graph showing a particle size distribution of copper powder present in a lubricating liquid used according to a conventional usage method.

FIG. 3 is a bar graph showing the particle size distribution of copper powder present in the lubricating liquid purified according to the present invention.

FIG. 4 is a graph showing a change in the amount of copper ions in the lubricating liquid with an increase in the amount of wire extension when used according to the conventional usage method.

FIG. 5 is a graph showing a change in the amount of copper ions in a lubricating liquid with an increase in the amount of wire extension when used according to the present invention.

[Explanation of symbols]

 1 Lubricant 2 Wire drawing tank 3 Recovery liquid tank 4 Hydrocyclone 5 Purification liquid tank 6 Heat exchanger 7 Multi-stage wire drawing die

Claims (4)

[Claims] 1. In a process of drawing a copper-plated steel wire for manufacturing a welding wire in a lubricating liquid of a water-soluble lubricant through a multi-stage drawing die, the lubricating liquid is recovered from a drawing tank in which the drawing die is immersed. Then, the solid-liquid separation means separates and removes the solid suspended matter mainly composed of copper powder in the lubricating liquid to purify the lubricating liquid,
A wire drawing method characterized in that the purified lubricating liquid is cooled, circulated in a wire drawing tank and reused. 2. The wire drawing method according to claim 1, wherein a liquid cyclone is used as the solid-liquid separating means. 3. Lubrication liquid is increased by controlling the rate of increase of copper ions to 0.00025% or less per 1 ton of wire extension.
The wire drawing method according to claim 1, wherein the wire drawing method is used for more than one month. 4. A wire drawing tank for drawing a copper-plated steel wire for producing a welding wire, wherein a multi-stage wire drawing die is immersed in a lubricating liquid of a water-soluble lubricant for use. The recovery liquid tank that stores the lubricant liquid that was collected from the A wire drawing device, which is essentially composed of a heat exchanger for cooling, and is provided with a pipe and a pump for circulating the above-mentioned lubricating liquid.