JPH0313924B2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention is a method for reducing compression flaws during bundling of hot-rolled wire rods, as well as reducing the height of the coil after bundling and improving the packing appearance. The present invention relates to a method for lubricating wire rods.

(Prior art) Hot rolled wire rods are usually manufactured using wire rod diameters of 5.5 to 18 mm.
Wire rods up to about mmφ are coiled in a laying head, and the non-concentric wire rings are continuously placed on a conveyor and cooled, then converged into concentric coils in a converging tab, and then transported to a binding machine by a hanger hook. be done.

In addition, wire rods with diameters ranging from 19 to 55 mmφ are immediately wound into concentric coils using a polling winding machine, cooled using blast equipment, etc., and then transported to a tying machine using hanger hooks. . Then, wrap the hoop and tie it with a binding machine. At that time, the contact between the wire rods presses against each other, resulting in compression flaws, which remain on the product as surface flaws, which can lead to problems such as breakage and the like. In addition, increasing the unit weight of coils and increasing the size of wire rods to smaller diameters in order to improve yields means that the height of the coils in the bundling machine increases, making charging into existing heat treatment furnaces difficult due to the height of the furnace. There were problems such as not being able to charge, not being able to fit into the customer's supply stand, and even not being able to fit into the pickling tank.

As a countermeasure to this problem, as shown in Japanese Patent Application Laid-Open No. 151115/1983, a lubricant is applied to the rolled wire rod during the cooling conveyance process or during bundling, and the wire rod is compressed and bundled, but this method has not completely solved the above problem. do not have. The reason for this is that there is no way to efficiently and uniformly lubricate concentric tight coil wire rods.

(Problems to be solved by the invention) Currently, the most popular lubrication treatment method is
There is an air atomization injection method, but since the spray cannot penetrate inside the tightly coiled wire, the area that can be lubricated is limited to the surface layer of the coil. Furthermore, since the sprayed fume is scattered around, equipment such as an exhaust system is also required. There are also methods of immersing the coil in an aqueous solution containing lubricant and methods of applying it in a shower, but these methods allow the lubricant to penetrate inside the coil, but the lubricant flows down and concentrates at the lower end of the coil. In addition to the increased lubrication thickness of the wire rods, the aqueous solutions that adhere and remain inside the coils do not drain easily, causing water to drip down to the downstream process and drying slowly, resulting in water oozing out during binding, which worsens the surrounding environment. There is. This means that the amount of lubricant taken out by the coil increases, and even if it is partially recovered and used, filters, circulation pumps, pits to collect the aqueous solution dripping down, etc. are required, and the equipment as a whole is There is a problem of increasing size.

(Means for Solving the Problems) The present invention has been made to advantageously solve the above-mentioned problems, and has extremely high lubricant application efficiency, and eliminates dripping of aqueous solution and generation of fumes. However, it provides an ideal lubrication method with low equipment costs.

The present invention provides a method for lubricating a hot-rolled wire rod during the process of sequentially conveying the wire rod, which comprises lubricating the wire rod with foam containing a lubricant and compressing the wire rod into a coil shape. It is.

Hereinafter, the present invention will be explained in detail using the drawings.

Fig. 1 shows an example of the method of the present invention, in which A shows a front view and B shows a side view, in which an aqueous solution containing a lubricant is foamed to foam a wire coil suspended from a hook hanger. This shows how to apply it.

Surfactants such as fatty acid complex amino salts and fatty acid salts can be used as lubricants as they are, so 0.5
These are dissolved in water to a concentration of ~50wt% and supplied from the lubricant supply port 5, and introduced into the foamer together with the air from the air supply port 6 to create foam 4, and the foam is applied directly to the wire coil 2 for lubrication. It is something. The foam contains an appropriate amount of water, and since the foam applied to the wire coil has fluidity, it easily penetrates into the highly packed coil and evenly lubricates the wire surface. In general, the thinner the wire diameter and the higher the packing density, the more difficult it is to lubricate the inside of the coil.However, by increasing the amount of water in the foam containing the lubricant and increasing the fluidity of the foam, lubrication can be easily achieved. can. Conversely, the larger the diameter of the wire and the lower the packing density, the easier it is for the foam applied to the coil to drip from the lower end of the coil, so the amount of water in the foam is reduced and the supply amount is also lowered for lubrication.

Here, the amount of water in the foam is 0.05 to 50g/100.
I will explain the reason why I limited it to ml.

The lower limit of 0.05g/100ml is when lubricating a wire coil with a wire diameter of 25mmφ and a filling density of about 20% with foam, when the lubricant is relatively easy to enter inside the coil, and the foam will not drip from the bottom end of the coil. This value was determined with a slight margin to the limit water content that can uniformly lubricate the surface of the wire. Also, 50
g/100ml means that when lubricating a wire coil with a wire diameter of 5.5 mmφ and a filling density of about 40% with foam, the lubricant is most difficult to penetrate into the inside of the coil, and the wire surface is evenly lubricated, and the wire is lubricated from the bottom end of the coil. This is the limit moisture content with almost no foam dripping. When the amount of water in the foam exceeds 50g/100ml, the fluidity of the foam becomes very good, and the foam will selectively flow down to areas of the wire coil with low packing density, making it difficult to lubricate evenly. It ends up.

The foam containing the lubricant used here is made from surfactants and water-soluble polymers, but if the surfactant itself has lubricating properties, it can be foamed without adding a foaming agent. However, if the lubricant does not have foaming properties, a surfactant or a water-soluble polymer may be added as a foaming agent. In addition, in situations where the temperature of the wire is high and the foam disappears quickly, it is possible to stably supply the foam for lubrication by adding a small amount of higher alcohol to the alkyl nitrate ester salt. can.

(Specific examples of surfactants and water-soluble polymers, specific examples of other additives) The blowing agents used in the present invention are surfactants and water-soluble polymers, which will be described in detail below.

The surfactant mentioned here refers to a water-soluble organic compound that adsorbs to the surface of gas and liquid and reduces surface activity.More specifically, it refers to fatty acid salts, higher alcohol sulfate ester salts, liquid fatty oil. Sulfate ester salts, sulfate salts of aliphatic amines and aliphatic amides, fatty alcohol phosphate ester salts, sulfone salts of dibasic fatty acid esters, fatty acid amide sulfonates, alkylaryl sulfonates, naphthalene sulfonates of formalin condensation , anionic activators such as aliphatic amine salts, quaternary ammonium salts, alkylpyridinium salts, etc., and cationic activators such as polyoxyethylene alkyl ethers, polyoxyethylene alkyl phenol ethers, polyoxyethylene The main ones include nonionic surfactants such as alkyl esters, sorbitan alkyl esters, polyoxysorbitan alkyl esters, and amphoteric surfactants such as alkyl betaines, alkyl dimethyl amoxides, and alkylalanines. It is not limited to this.

For foam generation, add one or a mixture of two or more of these surfactants to water at a concentration of 0.001 to 40%.
%.

In addition, water-soluble polymers include natural, synthetic, and semi-synthetic water-soluble polymers, specifically coast starch, starches, funori, agar, sodium alginate, gum arabic, gum tragacanth, trolo alloy, and konnyaku. , glue, casein, gelatin, egg white, blood protein, pullulan, dextrin, carboxy starch, gum brite, dialdehyde starch, cationic starch,
Viscose, methylcellulose, ethylcellulose, carboxymethylcellulose, hydroxyethylcellulose, polyvinyl alcohol, polyethylene glycol, polyalkylene glycol,
Main examples include polyacrylamide, polyacrylic acid, polyvinylpyrrolidone, water-soluble alkyd, polyvinyl ether, polymaleic acid copolymer, polyethyleneimine, saponin, etc., but are not limited thereto.

Regarding foam generation, one of these water-soluble polymers
It is desirable to add one or more species to water in an amount of 0.01 to 30%.

The above-mentioned surfactant and water-soluble polymer may be mixed and used in any proportion. Further, in order to improve the properties and stability of the foam, an appropriate amount of a chelating agent, builder, higher alcohol, etc. may be added to the aqueous surfactant solution or the mixture of the surfactant and water-soluble polymer.

Examples of chelating agents include aminocarboxylic acetic acids such as dihydroxyethylglycine, hydroxyethyliminodiacetic acid, nitrilotriacetic acid, hydroxyethylethylenediaminetriacetic acid, ethylenediaminetetraacetic acid, diethylenetriaminepentaacetic acid, sodium citrate, sodium gluconate, and sodium tartrate. , polycarboxylic acids, hydroxyethane diphosphonic acid, nitrilotrismethylenephosphonic acid, ethylenediaminetetramethylenephonic acid, and other hostonic acids, and condensed phosphates such as sodium tribolyphosphate and sodium pyrophosphate. , one or more types from 0.001
Preferably, 20% is used.

In addition, higher alcohols have 6 to 36 carbon atoms.
and secondary alcohols are preferred; hexanol, octanol, lauryl alcohol, myristyl alcohol, cetyl alcohol, stearyl alcohol, oleyl alcohol, carbon number 18,
One or more types of Guerbet alcohols such as 24 and 36 may be added in an amount of 0.5 to 30% based on the surfactant.

In addition, builders such as sodium silicate, sodium sulfate, and soda carbonate are added in an amount of 0.1 to 30% based on the above formulation.
May be added.

When a surfactant is used as a foaming agent, the surfactant adsorbs on the surface of gas and liquid, lowering the surface tension and increasing the surface viscosity, which improves the foaming properties during foam formation.
Improve the size of bubble diameter, uniformity, stability, etc.
Furthermore, when water-soluble polymers are used, they mainly improve the surface viscosity or surface viscoelasticity of the gas-liquid surface and form stable foams.

In this way, when a surfactant or a water-soluble polymer is used as a foaming agent, the foam produced becomes uniform and stabilized. In addition, the water content required for uniform lubrication by controlling bubble fluidity and bubble diameter is 0.05 to 50g/
You can create a layer of 100ml of uniform foam at will.
When this foam is used to lubricate wire coils, it becomes easier to control lubrication conditions such as uniform lubrication on the wire surface and dripping of foam from the bottom end of the coil, making it possible to stably manufacture steel products of the desired quality. .

On the other hand, it is also possible to form bubbles using only mechanical force such as forced stirring without using these blowing agents, but the bubbles formed in this way have high surface energy and low surface viscosity, so the bubbles are also stable. Uniform and poor stability. For this reason, the lubrication conditions for the wire rod are not constant, resulting in lot runout and quality fluctuations, making it difficult to stably produce steel materials of the desired quality.

(Example) Next, an example of the present invention will be described in detail with reference to FIGS. 1 and 2.

FIG. 1 is an explanatory diagram of the method of lubricating with foam according to the present invention, and FIG. 2 schematically shows an example of a production line for hot-rolled wire rods in which the method of the present invention is carried out.

The steel material heated to a predetermined temperature in the heating furnace 7 passes through a rough rolling mill 8 and an intermediate rolling mill 9, and is sent to a high-speed block mill 10 where it is processed into a wire rod of a predetermined size and diameter. 11 as a non-concentric coil wire, and uniformly cooled to a predetermined temperature in an adjustment cooling line 12.
The automatic bundling machine 13 binds the paper with a hoop and transports it to the next processing step.

Further, a wire having a large diameter of 19 mmφ or more is wound into a concentric tight coil by a polling winding machine 14.

In the present invention, a foam lubrication equipment 15 is installed in front of the automatic bundling machine 13 having such a line configuration, and the foam 4 containing lubricant is suspended from the hanger hook 1 from the foamer 3 shown in FIG. Lubricate over 2,
Compression and binding are performed by an automatic binding machine 13. The lubricant used for lubrication was prepared by dissolving a fatty acid complex amine salt and an alcoholic amine in water to bring the respective concentrations to approx.
As 0.1wt%, air is supplied from the supply port 5 at a rate of about 8/min, and air is supplied from the supply port 6 at a rate of about 100/min.
Add a 10μm polypropylene filter to the foamer 3.
bubbles were generated as a result. Three foamers 3 are arranged above the stop position of the coil 2 that is intermittently transferred,
When the wire coil 2 came under the foamer, it was lubricated by applying foam from five foamers for about 10 seconds.

Wire coil 2 lubricated with foam 4 in this way
The wire rods are immediately dried by the hot rolling residual heat of the wire rods themselves, and then compressed and bundled by the binding machine 13, and are lubricated by the conventionally most popular air atomization spray method. Compared to those that are compressed and bundled, the foam-lubricated wire coil of the present invention can be uniformly lubricated to the inside with foam during compression and binding, which significantly reduces compression flaws during binding and significantly reduces the coil height. I lowered it. As a result, we have been able to completely eliminate troubles such as breakage caused by compression flaws, and even if we increase the unit weight of the coil or increase the size of the wire material to the smaller diameter side, the height of the coil after bundling increases. This makes it possible to carry out the process without causing troubles in charging the existing heat treatment furnace or in the supply stand and pickling tank at the customer. We will show numerically the effect of this method in comparison with that of the conventional method.

In Figures 3 and 4, the tests were conducted on wire rods of the same steel type and wire diameter.
A is a method using the method of the present invention, and B is a method using an air atomization spray method, which is the most popular conventional method.

Both lubricants A and B were prepared by dissolving a fatty acid complex amine salt and an alcoholic amine in water so that the respective concentrations were approximately 0.1 wt%. As is clear from the test results shown in Figs. 3 and 4, the method of the present invention is capable of producing compression flaws with a depth of 0.01 mm or more during tying under the condition of a tying pressure of 10 tons for any wire diameter. The number of coils was significantly reduced based on the coil without lubrication treatment, and the height of the coils after bundling was also significantly improved over the conventional method.

According to the method of the present invention, since the lubrication process uses foam on a conventional production line for hot-rolled wire rods, the lubricant can be applied with minimal scattering or dripping from the lower end of the coil. Highly efficient and uniform lubrication is possible. Further, it is a simple and extremely inexpensive lubrication treatment method that does not require preparation for treatment of scattered lubricant or equipment for treatment of lubricant dripping from the lower part of the coil.

[Brief explanation of the drawing]

1A and 1B are explanatory diagrams of the method of the present invention, A is a front view, B is a side view, and FIG. FIG. 3 is a graph showing a comparison between the conventional example and the example of the present invention showing the compression flaw reduction rate, and FIG. 4 is a graph showing the comparison between the conventional example and the example of the invention showing the coil height reduction rate. 1... Hanger hook, 2... Wire coil, 3
... Foaming device, 4... Foam, 5... Lubricant supply port,
6... Air supply port, 7... Heating furnace, 8... Rough rolling mill, 9... Intermediate finishing rolling mill, 10... High speed block mill, 11... Laying head winder, 12
... Adjustment cooling equipment, 13 ... Binding machine, 14 ... Polling reel winding machine, 15 Foam lubrication device.

Claims (1)

[Claims] 1. A method for lubricating hot-rolled wire rods during the process of sequentially conveying the wire rods, characterized in that the wire rods are compressed and bundled after being lubricated by applying foam containing a lubricant to the wire rod coils. lubrication treatment method. 2 Moisture content in foam containing lubricant is 0.05~
The method for lubricating hot rolled wire rod according to claim 1, characterized in that the foam is 50gr/100ml. 3. The method for lubricating a hot rolled wire rod according to claim 1, wherein the foaming agent that creates the foam is a surfactant or a water-soluble polymer.