JPS63138918A - Lubrication treating method of hot roll wire rod - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention reduces compression flaws during bundling of hot-rolled wire rods, reduces the height of the coil after bundling, and improves the wire rod's packaging. The present invention relates to a lubrication treatment method.

(-Prior art) Hot-rolled wire rods are usually manufactured using wire rods with a diameter of 5.5 to 18 mm.
After about φ is coiled with a laying head, it is continuously placed on a non-concentric wire link or conhair and cooled, and then focused into a concentric coil with a focusing tab.
After that, it is transported to a binding machine using a hanger fan.

In addition, wire rods with a wire diameter in the range of 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 a hanger hook. . Then, wrap the hoop and tie it with a binding machine. At that time, the contact surfaces between the wire rods are pressed against each other, causing compression flaws, which remain on the product as surface flaws, and these flaws may be the starting point for problems such as breakage. In addition, increasing the coil weight by 1p and increasing the size of the wire to the smaller diameter side to improve yield will increase the coil height of the binding machine.
There were problems such as charging into the existing heat treatment furnace not being possible due to the height of the furnace, not being able to fill the supply stand of the customer, and even the pickling tank being empty.

As a countermeasure to this problem, as shown in Japanese Patent Application Laid-Open No. 56-151115, an fE1 lubricant is applied to the rolled wire rods during cooling and conveyance or during bundling and the wire rods are compressed and bundled, but this has not completely solved the above problem. The reason for this is that there is no way to efficiently and uniformly lubricate concentric tight coil wire rods.

(Problem to be solved by the invention) At present, the most popular lubrication method is the air atomization spray method, which can lubricate the tightly coiled wire because the spray cannot penetrate inside it. The area is also 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. In addition, there is a method of immersion in an aqueous solution containing a lubricant,
There is also a method of applying the lubricant to the inside of the coil, but since the lubricant flows down and concentrates at the lower end of the coil, the thickness of the wire rod at the lower end of the coil becomes thicker, and eventually In addition, the aqueous solution that adheres and stagnates inside the coil does not drain well, causing water to drip down to the downstream process, making it difficult to dry, causing water to ooze out during binding and worsening the surrounding environment. This means that the amount of lubricant taken out by the coil increases, and even if it is partially recovered and used, a filter, a circulation pump, a bit to collect the aqueous solution that drips, 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 does not cause dripping or fumes of the aqueous solution. 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 embodiment of the method of the present invention, in which (A) shows a front view and (B) shows a side view, in which a wire rod is suspended from a hook hanger by foaming an aqueous solution containing a lubricant. This shows how to apply foam to the coil.

Surfactants such as fatty acid complex amine salts and fatty acid salts can be used as lubricants as they are, so 0.5 to 50wj
%, these are dissolved in water 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 then the foam is directly applied to the wire coil 2 for lubrication. be. 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, the
The higher the packing density, the more difficult it becomes to lubricate the inside of the coil, but lubrication can be easily achieved by increasing the amount of water in the foam containing the lubricant and increasing the fluidity of the foam. Conversely, the larger the diameter of the wire and the lower the packing density, the more easily the foam applied to the coil drips from the lower end of the coil, which reduces the amount of moisture in the foam and reduces the supply blockage for lubrication.

Here, the moisture h''C in the foam is 0.05 to 50) (/
The reason for limiting it to IOQml will be explained.

The lower limit of 0.05 g/100 m1 is when lubricating a wire coil with a wire diameter of 25 mmφ and a packing density of about 20% with foam, when the lubricant is relatively easy to enter inside the coil, and the foam drips from the lower end of the coil. This value was determined with a slight margin to the limit moisture content that can uniformly lubricate the surface of the wire without falling. Also, 50g7100ml has a wire diameter of 5. ``When lubricating a wire coil with a diameter of 5 mm and a filling density of about 40% with foam, the wire surface is evenly lubricated under conditions where it is difficult for the lubricant to penetrate inside the coil, and there is almost no foam dripping from the bottom end of the coil. This is the limit moisture content.When the moisture content in the foam exceeds 50g/100ml, the fluidity of the foam becomes very good, so the foam will flow down selectively into the parts of the wire coil where the packing density is low. On the contrary, it becomes difficult to achieve a uniform 11-slide.

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. If the lubricant does not have foaming properties, a surfactant or a water-soluble polymer is added as a foaming agent. In addition, if the temperature of the wire is high and the foam disappears quickly, take measures such as adding a small amount of higher alcohol to the alkyl sulfate ester salt to stably supply the foam for lubrication. I can do it.

(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 here refers to a water-soluble organic compound that adsorbs to the surface of gas and liquid to reduce surface activity.
More specifically, fatty acid salts, higher alcohol sulfate ester salts, liquid fatty oil sulfate ester salts, sulfates of aliphatic amines and aliphatic amides, fatty alcohol phosphate ester salts, sulfone salts of dibasic fatty acid esters, fatty acids Anionic activators such as amidosulfonates, alkylarylsulfonates, formalin condensed naphthalene sulfonates, cationic activators such as aliphatic amine salts, quaternary ammonium salts, alkylpyridinium salts, and polyoxy Nonionic activators such as ethylene alkyl ethers, polyoxyethylene alkylphenol ethers, polyoxyethylene alkyl esters, sorbitan alkyl esters, polyoxysorbitan alkyl esters, or alkylhetaines, alkyl dimethyl amoxides, and alkylalanines. The main amphoteric activators such as
It is not limited to this.

When generating foam, one or both of these surfactants are used.
It is preferable to use a mixture of more than one species in an amount of 0.001 to 40% based on water.

Water-soluble polymers include natural, synthetic, and semi-synthetic water-soluble polymers, such as corn starch, starches, funori, agar, alginate sorta, gum arabic, gum tragacanth, trolo alloy, konjac, garlic, casein, gelatin, egg white, plasma protein,
Pullulan, dextrin, carboxy starch, pritesh gum, dialdehyde starch, cationic starch,
Viscose, methylcellulose, ethylcellulose, carboxymethylcellulose, hydroxyethylcellulose, polyvinyl alcohol, polyethylene glycol,
Main examples include polyalkylene gelicol, polyacrylamide, polyacrylic acid, polyvinylpyrrolidone, water-soluble alkyd, polyvinyl ether, polymaleic acid copolymer, polyethyleneimine, saponin, etc., but are not limited to these. do not have.

Regarding foam generation, it is desirable to use one or more of these water-soluble polymers in an amount of 0.01 to 30% based on water.

The above-mentioned surfactant and water-soluble polymer may be mixed and used in any proportion. In addition, in order to improve the properties and stability of the foam, suitable chelating agents, builders,
A higher alcohol or the like may be added.

Examples of chelating agents include dihydroxyethylglycine, hydroxyethyliminodiacetic acid, nitrilotriacetic acid,
Amino acids such as hydroxyethyl ethylenediamine triacetic acid, ethylenediaminetetraacetic acid, diethylenetriaminepentaacetic acid, etc., oxycarboxylic acids such as nocarphonacetic acid, sodium citrate, sodium gluconate, and sodium tartrate, polycarboxylic acids, hydroxyethane diphosphonic acid, There are phosphonic acids such as nitrilotrismethylenephosphonic acid and ethylenediaminetetramethylenephonic acid, and condensed phosphates such as sodium tripolyphosphate and sodium birophosphate.
It is preferable to use one or more of them in an amount of 0.001-20%.

Further, the higher alcohol is preferably a 1vi or secondary alcohol having 6 to 36 carbon atoms, such as hexanol, octatool, lauryl alcohol, myristyl alcohol, cetyl alcohol, stearyl alcohol, oleyl alcohol, and 18, 24.36 carbon atoms. One or more types of Guerbet alcohol such as 0.5 to 3
0% may be added.

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

When a surfactant is used as a foaming agent, the surfactant absorbs onto the surface of the gas and liquid, lowering the surface tension and increasing the surface viscosity, which improves the foaming performance during foam formation, the size and uniformity of the foam diameter, and the stability. In addition, when a water-soluble polymer is used, two layers mainly improve the surface viscosity or surface viscoelasticity of the gas-liquid surface and form stable bubbles.

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, by controlling the fluidity and diameter of the foam, it is possible to create a uniform layer of foam with a water content of 0.05 to 50 g/100 m1, which is necessary for uniform lubrication. When this foam is used to lubricate a wire coil, it becomes easier to control the 4. slipping conditions related to uniform lubrication on the wire surface and dripping of foam from the bottom end of the coil.
It is possible to stably produce steel materials with the target quality.

On the other hand, it is possible to form foam using only mechanical force such as forced stirring without using a stiff foaming agent, but the foam formed in this way has high surface energy and low surface viscosity, so the foam is It is non-uniform and has poor stability. For this reason, the lubrication conditions for the wire rod are not constant, resulting in lot fluctuations and quality fluctuations, making it difficult to stably manufacture steel materials with the target quality.

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

Figure 1 is an explanatory diagram of the method of lubricating with foam according to the present invention;
The figure schematically shows an example of a production line for hot-rolled wire rods that implements the method of the present invention.

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 then is sent to a high speed block mill 10 where it is processed into a wire rod of a predetermined size and diameter, and then passed through a laying head winding machine. 11 as a non-concentric solid coil wire, uniformly cooled to a predetermined temperature in an adjustment cooling line 12, bound with a hoop by an automatic binding machine 13, and transported to the next processing step.

Further, a wire having a large diameter of l'l+nmφ or more is wound into a concentric tight coil by a polling winding machine 14.

The present invention is an automatic binding machine with such a line configuration! 3. A foam lubrication equipment 15 is installed in the IFf, and the foam 4 containing lubricant from the foamer 3 shown in FIG. do. The lubricant used for lubrication was prepared by dissolving a fatty acid complex amine salt and an alcoholic amine in water, making the respective concentrations approximately 0% and 1%, and applying the lubricant from the supply port 5 to approximately 81%.
17mlrn, also supply air [16 to about 1001
A 10 μm polypropylene filter was used as the foamer 3 to generate foam. Three foamers 3 were placed above the stop position of the coil 2, which was intermittently transferred, and when the wire coil 2 came under the foamer, foam was applied from five foamers for about 10 seconds for lubrication. .

With bubbles 4 like this? The wire rod coil 2 that has been subjected to the 171 lubricating treatment is immediately dried by the hot rolling residual heat of the wire rod itself, and then compressed and bundled by the binding machine 13. As a result, the wire rod coil 2 is lubricated by the air atomization spray method, which is the most popular conventional method. Compared to wire rod coils that are compressed and bundled, the bubble-lubricated wire coil of the present invention can be uniformly lubricated to the inside with bubbles during compression binding, which significantly reduces compression flaws during binding and reduces the coil height. was significantly lower. 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 charging into existing heat treatment furnaces without causing trouble at the customer's supply stand or pickling tank, and Figures 3 and 4 demonstrate its advantages. 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 the same diameter; A is the method of the present invention, and B is the conventional method, which is the most popular This method uses a single type of air atomization method.

The lubricants A and B used at this time were both 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%. Figure 3,
As is clear from the test results shown in FIG.
Under these conditions, the number of flaws with a compression flaw depth of O, 01mm or more during bundling is significantly improved at a reduction rate compared to coils that are not lubricated, and the height of the coil after bundling is also significantly improved over the conventional method. A remarkable effect was obtained.

According to the method of the present invention, since the lubrication process uses foam on the conventional production line for hot-rolled wire rods, the scattering of the lubricant during application and the dripping of lE1 lubricant from the lower end of the coil are minimized. Highly efficient and uniform lubrication is possible. In addition, it does not require any preparation for the treatment of scattered lubricant or equipment for treating lubricant dripping from the lower part of the coil, and the structure is simple, making it an extremely inexpensive method of lubrication treatment.

[Brief explanation of the drawing]

FIG. 1 (A) (+1) is an explanatory diagram of the method of the present invention, (8) is a front view, ([1) is a side view, and FIG. 2 is a hot rolled wire rod manufacturing line implementing the method of the present invention. An explanatory diagram showing an example of
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 J-graph showing the comparison between the conventional example and the example of the invention showing the coil height reduction rate. .

Claims (3)

[Claims] (1) A method for lubricating hot-rolled wire rods during the process of sequentially conveying the hot-rolled wire rods, the method comprising applying foam containing a lubricant to a wire rod coil to lubricate it, and then compressing and bundling the wire rods. . (2) Moisture content in foam containing lubricant is 0.05 to 50
2. The method for lubricating a hot rolled wire rod according to claim 1, wherein the foam is a foam of gr/100ml. (3) The method for lubricating a hot rolled wire rod according to claim 1, wherein the foaming agent for creating foam is a surfactant or a water-soluble polymer.