JP2008200689A - Rolling method for aluminum sheet or aluminum alloy sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rolling method for an aluminum sheet or an aluminum alloy sheet by which a rolled sheet having excellent sheet surface quality can be obtained by suppressing the occurrence of seizure caused by the insufficiency of lubrication of hot rolling oil and deterioration in the removability of the rolling oil from the surface of the sheet. <P>SOLUTION: The rolling method for an aluminum sheet or an aluminum alloy sheet comprises performing hot rolling using hot rolling oil, wherein the hot rolling is performed in such a manner that the average oil grain diameter of hot rolling oil in the hot rolling is controlled to the range of 3 to 10 μm. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method for rolling an aluminum plate or an aluminum alloy plate that is hot-rolled using hot-rolled oil.

  In general, in hot rolling (rolling) of an aluminum plate or an aluminum alloy plate (hereinafter also referred to as an aluminum plate), aluminum (or aluminum alloy) is transferred from the surface of the rolled plate to the surface of the rolling roll, and roll coating is performed. It is formed. Then, since the rolled plate is rolled in contact with the roll coating, the surface quality of the rolled plate depends on the properties of the roll coating. Since the surface defects of the aluminum plate generated during hot rolling also affect the surface quality of the aluminum plate after cold rolling, it can be said that the roll coating properties in hot rolling are very important.

  Roll coating properties depend on rolling conditions (plate material, plate temperature, plate surface roughness, roll temperature, roll surface roughness, rolling reduction, rolling speed, brush roll operating conditions, etc.) and hot rolling oil used in rolling. Change. Therefore, the selection of hot rolling oil is essential for controlling roll coating.

  Further, in hot rolling, sufficient roll cooling is required, so hot rolling oil is used in the form of an emulsion. Examples of the performance required for hot rolling oil include rolling lubricity, roll coating property, plate surface quality, and emulsion stability.

  Conventionally, hot rolling oil used for rolling aluminum plates contains mineral oil as a base oil and contains oiliness improvers such as fatty acids, natural fats and oils, fatty acid esters, extreme pressure agents, rust inhibitors, antioxidants, etc. These are mainly emulsified with an anionic surfactant to obtain an emulsion having a concentration of 2 to 10% by mass. However, since hot rolling oils using conventional emulsifiers tend to conflict with rolling lubricity and emulsion stability, it has not been possible to satisfy both performances. That is, when the rolling lubricity is increased, the emulsification stability is lowered, and as a result, the temporal stability of the rolling lubricity is also lowered, so that the quality stability of the aluminum plate surface becomes a problem. On the other hand, when the emulsion stability is increased, sufficient rolling lubricity cannot be obtained, and as a result, various defects are generated on the surface of the aluminum plate.

In order to satisfy both the rolling lubricity and emulsion stability (plate surface quality), which are opposite properties as described above, for example, in Patent Document 1, a specific lubricating oil component and a specific water-soluble cationic polymer are used. A hot rolling oil composition (hot rolling oil) in combination with a compound is disclosed. Further, for example, in Patent Document 2, as a device for improving the rolling lubricity without deteriorating the iron corrosion resistance, the fatty acid content is limited and a relatively large amount of natural fats and / or synthetic esters is used. Therefore, a hot rolling oil that improves rolling lubricity is disclosed.
Japanese Patent No. 2869850 (paragraphs 0009 to 0022) JP-A-8-170090 (paragraph 0006, paragraph 0023)

  However, in the hot rolling oil composition (hot rolling oil) described in Patent Document 1, fatty acids (improved oiliness) are used for the purpose of improving rolling lubricity from recent mass production and high-quality orientation of rolled aluminum products. However, if the amount of fatty acid is increased, there is a problem that it has strong corrosiveness, and a metal soap of a high-viscosity material that is generated with the progress of rolling contaminates the periphery of the rolling mill. is there. Moreover, in the hot rolling oil described in Patent Document 2, while limiting the content of fatty acid, a relatively large amount of natural fats and / or synthetic esters is used to improve rolling lubricity. However, neither rolling lubricity nor sheet surface quality was satisfied.

  Furthermore, in the hot rolling using the conventional hot rolling oil, if the average oil particle size is usually the same as that of the emulsion having a concentration of 2 to 10% by mass (1 μm or more and less than 3 μm), the oil adheres to the aluminum plate. Since the amount is insufficient, there is a problem that seizure is likely to occur due to insufficient lubrication. Further, when the average oil particle diameter is excessively large, the amount of oil attached to the aluminum plate becomes excessive, and there is a problem that the rolling oil drainage on the plate surface is likely to deteriorate. Further, when hot rolling oil is used for a long period of time, there is a problem that the viscosity increases due to the mixing of impurities such as metal powder having a fine particle diameter and other kinds of oil, and the rolling oil drainage on the plate surface is deteriorated.

  The present invention has been made in view of such problems, and by suppressing the occurrence of seizure due to insufficient lubrication of hot rolling oil and deterioration of rolling oil drainage of the plate surface due to over lubrication, an excellent plate surface It is an object of the present invention to provide a method for rolling an aluminum plate or an aluminum alloy plate, which can obtain a quality rolled plate.

  In order to solve the above-described problems, a rolling method of an aluminum plate or an aluminum alloy plate according to the present invention is a rolling method of an aluminum plate or an aluminum alloy plate that is hot-rolled using hot rolling oil, and is hot-rolled The hot rolling is performed while controlling the average oil particle diameter of the hot rolling oil in the range of 3 to 10 μm.

  According to such a method of rolling an aluminum plate or an aluminum alloy plate, by controlling the average oil particle diameter of the hot rolling oil to be in the range of 3 to 10 μm, the occurrence of seizure due to insufficient lubrication of the hot rolling oil and excessive It is possible to suppress deterioration of the rolling oil drainability on the plate surface due to lubrication.

In the method for rolling an aluminum plate or an aluminum alloy plate according to the present invention, the hot rolling oil contains a hot rolling oil composition and an emulsifier, and the hot rolling oil composition is (a) a kinematic viscosity of 80 mm ^2. / S (40 ° C.) or less, (b) a fatty acid having 10 to 22 carbon atoms, (c) a natural fat and oil, and a monovalent higher fatty acid or a synthetic ester obtained from a polybasic acid and an alcohol. 1 type and (d) C8-C26 higher alcohol are contained, It is characterized by the above-mentioned.

  According to such a rolling method of an aluminum plate or an aluminum alloy plate, the hot rolling oil composition which is a component of the hot rolling oil has a mineral oil having a predetermined kinematic viscosity as a base oil and has 10 to 22 carbon atoms. Of at least one selected from the following fatty acids, natural fats and oils, and monovalent higher fatty acids or synthetic esters obtained from polybasic acids and alcohols, and higher alcohols having 8 to 26 carbon atoms. Hot rolling using hot rolling oil excellent in surface quality can be performed.

  Furthermore, in the method for rolling an aluminum plate or an aluminum alloy plate according to the present invention, the emulsifier is a polymer or a copolymer of a monomer represented by the following general formula (1) or a salt thereof or a quaternized product thereof. And it is at least 1 sort (s) of the high molecular compound whose mass mean molecular weight is 10,000-1,000,000, It is characterized by the above-mentioned.

(In the formula, R ¹ is a hydrogen atom or a methyl group, R ² and R ³ are the same or different, an alkyl group having 1 to 3 carbon atoms, and m is an integer of 1 to 3).

  According to such a rolling method of an aluminum plate or an aluminum alloy plate, the emulsifier which is a component of the hot rolling oil is at least one of the above-described polymer compounds, so that the oil particles of the hot rolling oil are large particles. Since it becomes a diameter and emulsification dispersibility becomes good, hot rolling using hot rolling oil excellent in rolling lubricity and long-term circulation stability can be performed.

  The method for rolling an aluminum plate or an aluminum alloy plate according to the present invention can suppress the occurrence of seizure due to insufficient lubrication of hot rolling oil and the deterioration of rolling oil drainage on the surface of the plate due to overlubrication. A rolled plate with surface quality can be obtained, and stable rolling can be performed.

Hereinafter, embodiments of the present invention will be described in detail.
The method for rolling an aluminum plate or an aluminum alloy plate according to the present embodiment is a method for rolling an aluminum plate or an aluminum alloy plate that is hot-rolled using a hot rolling oil containing a hot rolling oil composition and an emulsifier. During the hot rolling, the hot rolling is performed by always controlling the average oil particle diameter of the hot rolling oil in the range of 3 to 10 μm.

[Average oil particle diameter: 3 to 10 μm]
The method for rolling an aluminum plate according to the present embodiment controls the average oil particle diameter of the hot rolled oil to a range of 3 to 10 μm, thereby causing seizure due to insufficient lubrication of the hot rolled oil and the plate surface due to overlubrication. The deterioration of the rolling oil drainability can be suppressed.

  If the average oil particle diameter is less than 3 μm, the amount of oil adhering to the aluminum plate is insufficient, and seizure due to insufficient lubrication is likely to occur. On the other hand, when the average oil particle diameter exceeds 10 μm, the amount of oil adhering to the aluminum plate becomes excessive, the rolling oil drainability on the plate surface is likely to deteriorate (rolling oil residue is generated), and the rolling lubrication stability is also improved. Is easily damaged.

  The average oil particle size is controlled by adjusting the amount (concentration) of the cationic polymer compound (component (f) described later) to the hot rolling oil storage tank and the heat in the hot rolling oil storage tank in the rolling mill. It is performed by adjusting the agitation conditions of the hot rolling oil (shearing conditions of the oil particles of the hot rolling oil) and the new oil exchange amount.

[Hot rolling oil]
The hot rolling oil used in this embodiment is a water-dispersed rolling oil (an aqueous solution containing a hot rolling oil composition and an emulsifier) in which a hot rolling oil composition and an emulsifier described below are dispersed in water.
Hereinafter, the hot rolling oil composition and the emulsifier used in the present embodiment will be described.

The hot rolling oil composition comprises (a) a mineral oil having a kinematic viscosity of 80 mm ² / s (40 ° C.) or less, (b) a fatty acid having 10 to 22 carbon atoms, (c) a natural fat and oil, and a monovalent higher fatty acid or polybasic It is preferable to contain at least one selected from synthetic esters obtained from acids and alcohols, and (d) higher alcohols having 8 to 26 carbon atoms.
Hereinafter, each component of the hot rolling oil composition will be described.

<(A) component: mineral oil>
Examples of the mineral oil as component (a) include spindle oil, machine oil, turbine oil, cylinder oil, neutral oil and the like, and any of paraffinic mineral oil and naphthenic mineral oil may be used. In view of heat resistance and rolling lubricity, it is preferable to use paraffinic mineral oil. (A) a kinematic viscosity of component is required to be 80mm ² / s (40 ℃) or less, if 80mm ² / s (40 ℃) or less kinematic viscosity aluminum plate surface quality of the (plate surface The quality is excellent, and there is little residual oil on the hot-rolled aluminum plate. In addition, when kinematic viscosity exceeds 80 mm < ² > / s (40 degreeC), since plate surface quality falls, it is unpreferable.
The component (a) is a base oil, and the content of the component (a) in the hot rolling oil composition is not particularly limited, but is preferably 10 to 95% by mass, and 30 to 65% by mass. More preferred.

<(B) Component: Fatty acid>
The fatty acid having 10 to 22 carbon atoms as the component (b) is added for the purpose of improving the rolling lubricity. Fatty acid is an oiliness improver that has little adverse effect on roll coating properties and plate surface quality, and has excellent boundary lubricity.
As the component (b), for example, one or more kinds of capric acid, lauric acid, palmitic acid, stearic acid, isostearic acid, oleic acid, behenic acid, erucic acid, coconut oil fatty acid, palm oil fatty acid, beef tallow fatty acid and the like are used. However, it is preferable to use liquid fatty acids (for example, capric acid, isostearic acid, oleic acid, erucic acid, coconut oil fatty acid, etc.) at room temperature (25 ° C.) for handling.

1-14 mass% is preferable and, as for content of (b) component in a hot rolling oil composition, 3-10 mass% is more preferable. If content of (b) component is the range of 1-14 mass%, it will be excellent in rolling lubricity, metal corrosion resistance, and dirt resistance.
When the fatty acid content exceeds 14% by mass, the metal corrosivity is increased. Moreover, the metal soap produced | generated with progress of rolling pollutes a rolling mill periphery, and causes a product stain | pollution | contamination.

<(C) component: natural fat and oil and / or synthetic ester>
Component (c), natural fat and oil and / or synthetic ester, is an excellent oiliness improver after component (b), and is added for the purpose of improving rolling lubricity.

Examples of natural fats and oils include animal and vegetable fats and oils such as whale oil, beef tallow, lard, rapeseed oil, castor oil, palm oil and coconut oil. From the viewpoint of rolling lubricity, plate surface quality and melting point, lard It is preferable to use palm oil.
The content of the natural fat / oil in the hot rolling oil composition is preferably 2 to 30% by mass from the viewpoint of the melting point of the hot rolling oil.

The synthetic ester is preferably an ester of a monovalent higher fatty acid having 10 to 22 carbon atoms or a polybasic acid and an alcohol, and may be a full ester or a partial ester.
Examples of the alcohol include aliphatic monohydric alcohols having 1 to 22 carbon atoms and polyhydric alcohols such as diethylene glycol, neopentyl glycol, trimethylolpropane, pentaerythritol, and glycerin.
As the fatty acid and alcohol, any saturated or unsaturated fatty acid can be used, but a saturated one is more preferable from the viewpoint of plate surface quality.

  Specific examples of synthetic esters include saturated fatty acid monoesters such as methyl caprate, butyl stearate and lauryl isostearate; polybasic acids such as dilauryl adipate, dilauryl phthalate and tridecyl trimellitic acid and saturated aliphatic monohydric alcohols Esters with: neopentyl polyol saturated fatty acid ester (neopentyl glycol dilaurate, trimethylolpropane palm oil fatty acid triester, trimethylolpropane isostearic acid triester, trimethylolpropane dilaurate, pentaerythritol monolaurate, pentaerythritol tetralaurate, Pentaerythritol isostearic acid tetraester), glycerin saturated fatty acid ester (glycerin coconut oil fatty acid diester, glycerin trilaure) DOO, etc.), esters, and the like of the monovalent higher fatty acid and a polyhydric alcohol such as diethylene glycol saturated fatty acid esters.

The synthetic ester is preferably an ester of a monovalent higher fatty acid having 10 to 22 carbon atoms and a polyhydric alcohol from the viewpoint of rolling lubricity, plate surface quality and melting point, and a monovalent saturated higher fatty acid having 10 to 22 carbon atoms. More preferred are esters with polyhydric alcohols.
The content of the synthetic ester in the hot rolling oil composition is preferably 2 to 30% by mass from the viewpoint of the price of the hot rolling oil.

Such component (c) may be used alone, or one or more of each may be used in combination. Natural fats and oils and synthetic esters generally have an adverse effect on roll coating properties and plate surface quality, and are therefore not preferred to be incorporated in an excessive amount, but their content can be increased by coexisting with higher alcohols.
The content of the component (c) in the hot rolling oil composition is preferably 2 to 50% by mass, and 10 to 40% by mass from the viewpoint of balance of rolling lubricity, melting point, plate surface quality, price and the like. More preferred.

<(D) component: higher alcohol>
The higher alcohol having 8 to 26 carbon atoms as component (d) is added for the purpose of improving rolling lubricity and plate surface quality.
Even when the component (d) is used for oil having a higher temperature and higher lubrication than cold rolling oil, such as hot rolling oil, it exhibits boundary lubricity equivalent to the component (b) described above, and thermally Since there is no decomposition / volatilization and is relatively stable, the plate surface quality can be improved.

The component (d) may be linear or branched, and any saturated or unsaturated component can be used. Moreover, monohydric alcohol or polyhydric alcohol more than bivalence may be sufficient. From the viewpoint of rolling lubricity, those having 8 to 18 carbon atoms in the straight chain portion are preferred.
Specific examples of such component (d) include decyl alcohol, lauryl alcohol, myristyl alcohol, cetyl alcohol, stearyl alcohol, oleyl alcohol, elaidyl alcohol, linoleyl alcohol, palm oil reduced alcohol, palm oil reduced alcohol, beef tallow Reduced alcohol, oxo alcohol having 11 to 18 carbon atoms, Ziegler alcohol having 12 to 18 carbon atoms, Gerve alcohol having 12 to 26 carbon atoms, octadecane 1,2-diol, lauryl alcohol ethylene oxide adduct (2 mol or less) and the like. Can be mentioned. In view of rolling lubricity and plate surface quality, monohydric alcohols having a linear or branched alkyl group are preferred, and monovalent saturated alcohols are more preferred.

When component (d) is added in a large amount, the viscosity of the hot rolling oil composition is reduced. Therefore, the content of component (d) in the hot rolling oil composition is preferably 2 to 30% by mass, and rolling lubrication. From the point of property, 10-30 mass% is more preferable.
Moreover, when (d) component is added, even if it mix | blends a large amount of above-described (c) components, the fall of plate surface quality can be suppressed. The mass ratio of the component (c) to the component (d) in the hot rolling oil composition is (d) component / (c) component = 1/1 from the viewpoint of rolling lubricity and plate surface quality. ~ 1/10 is preferable, and 1/1 to 1/5 is more preferable.

<Phosphorus extreme pressure agent>
The above is description about the (a)-(d) component of a hot rolling oil composition.
In addition to the above-described components (a) to (d), the hot rolling oil composition contains a phosphorus-based extreme pressure agent (hereinafter referred to as component (e) for the purpose of improving the plate surface quality, if necessary. May be added.

Examples of the phosphorus-based extreme pressure agent as the component (e) include tricresyl phosphate, dibutyl phosphate, monooctyl phosphate, trioleyl phosphate, tributyl phosphate, diisooctyl phosphite, triisooctyl phosphite, trioleyl. A phosphite etc. are mentioned.
0.5-10 mass% is preferable and, as for content of the (e) component in a hot rolling oil composition, 3-10 mass% is more preferable. Although (e) component may be 1 type, 2 or more types can also be mixed and used for it.

<Emulsifier>
Next, the emulsifier used in this embodiment will be described. The emulsifier is added in order to disperse the above-described hot rolling oil composition (components (a) to (d) or (a) to (e)) in water, that is, to form an emulsion.

Examples of the emulsifier include anionic surfactants such as oleic acid triethanolamine salt and petroleum sulfonate sodium salt, nonionic surfactants such as polyoxyethylene lauryl ether, and quaternary ammonium salts such as benzalkonium type. Cationic surfactants, general polymer-type dispersants, and the like.
As for content of the emulsifier in all the components for producing hot rolling oil, 0.1-5 mass% is preferable.

  Among such emulsifiers, a monomer represented by the following general formula (1) or a salt thereof or a polymer or copolymer of a quaternized product thereof, having a mass average molecular weight of 10,000 to 1, It is preferable to use at least one polymer compound (hereinafter referred to as the component (f)) that is 1,000,000. By using at least one of such polymer compounds as an emulsifier, a stable emulsion-dispersible emulsion having a large particle size can be obtained.

(In the formula, R ¹ is a hydrogen atom or a methyl group, R ² and R ³ are the same or different, an alkyl group having 1 to 3 carbon atoms, and m is an integer of 1 to 3).

  In the component (f), specific examples of the monomer represented by the general formula (1) include dimethylaminoethylacrylamide, dimethylaminopropylacrylamide, diethylaminomethylacrylamide, dimethylaminoethylmethacrylamide, dimethylaminopropylmethacrylamide, Examples include diethylaminomethyl methacrylamide.

  Preferred acids for obtaining the salt of the monomer represented by the general formula (1) include, for example, acetic acid, butyric acid, caproic acid, caprylic acid, glycolic acid, succinic acid, tartaric acid, phosphoric acid, and acidic alkyl phosphoric acid. Examples thereof include esters (such as butyl acid phosphate and octyl acid phosphate) and boric acid. The salt is formed by neutralizing the monomer or the polymer after polymerization.

  Preferable quaternizing agents for obtaining a quaternized product of the monomer represented by the general formula (1) include, for example, alkyl halides such as methyl chloride, ethyl chloride, methyl bromide and methyl iodide, sulfuric acid Common alkylating agents such as dimethyl, diethyl sulfate, di-n-propyl sulfate and the like can be mentioned.

Component (f) is a copolymerizable monomer such as a monomer represented by the general formula (1), (meth) acrylic acid or a salt thereof, (meth) acrylic acid alkyl ester, (meth) acrylamide, and the like. And a copolymer thereof. In addition, (meth) acryl means acryl or methacryl.
Specific examples of the copolymerizable monomer include butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, wherein the alkyl group is a linear or branched alkyl group having 1 to 22 carbon atoms, ( Examples include (meth) acrylic acid alkyl esters such as lauryl methacrylate and stearyl (meth) acrylate, (meth) acrylamides such as (meth) acrylamide and N-methyl (meth) acrylamide.
Specific examples of the (meth) acrylate include alkali metal salts such as sodium acrylate and potassium methacrylate.

  The structural unit derived from the monomer represented by the general formula (1) or a salt thereof or a quaternized product thereof is preferably 50 to 100% by mass in the component (f).

The weight average molecular weight of the component (f) is preferably 10,000 to 1,000,000, more preferably 30,000 to 300,000. When the mass average molecular weight is in the range of 10,000 to 1,000,000, the emulsion stability is excellent, the stability of the polymer compound itself is good, and handling is easy.
The weight average molecular weight of the component (f) was determined by hydrolyzing the component (f) (adding 20 ml of N / 2 KOH solution to 1 g of sample and heating at about 95 ° C. for 2 hours), and then gel permeation under the following conditions: The molecular weight is analyzed by a chromatography (GPC) method, and the original molecular weight is converted from the result.

-Condition-
-Column: G2000SW (manufactured by Tosoh Corporation) x 2-Column temperature: 40 ° C
Eluent: 0.1N sodium chloride aqueous solution / acetonitrile = 70/30
・ Detector: RI (refractometer)
Injection volume: 1% by mass eluent solution, 20 μl
・ Liquid flow rate: 0.4 ml / min
・ Molecular weight standard: Sodium polystyrene sulfonate

  Although the surface potential of the oil particles of the hot rolled oil is negative, the surface potential of the oil particles becomes almost zero as the component (f) is added, and the oil particles are aggregated to have a coarse particle diameter. When the component (f) is further added, the surface potential of the oil particles becomes positive, and the oil particles have a large particle diameter and good emulsification dispersibility due to the protective colloid action, so that the plate-out property is improved. Excellent rolling lubricity and long-term circulation stability. When the component (f) is further added, the emulsification dispersibility becomes very good, but the oil particle size becomes the medium particle size, so that the plate-out property becomes insufficient and the lubricity is poor.

  Therefore, the content of the component (f) in all the components for producing the hot rolling oil is preferably 0.1 to 5% by mass from the viewpoint of oil particle diameter and long-term circulation stability, 2 mass% is more preferable. If the content of the component (f) is in the range of 0.1 to 5% by mass, the oil particle diameter is large and the long-term circulation stability is excellent. Although (f) component may be 1 type, it can also be used in mixture of 2 or more types.

<Others>
In addition to the above-described components (a) to (f), additives such as a rust / corrosion inhibitor and an antioxidant can be added to the hot rolling oil as necessary.

Examples of the rust / corrosion preventive agent include alkenyl succinic acid and derivatives thereof, fatty acids such as oleic acid, esters such as sorbitan monooleate, and amines.
The content of the anticorrosive and anticorrosive agent in all components for producing hot rolled oil is preferably 2% by mass or less.

As the antioxidant, for example, phenol compounds such as 2,6-di-tert-butyl-p-cresol, aromatic amines such as phenyl α-naphthylamine, and the like can be used.
As for content of the antioxidant in all the components for producing hot rolling oil, 5 mass% or less is preferable.

As described above, the hot rolling oil used in the present embodiment is a water-dispersed rolling oil in which a hot rolling oil composition and an emulsifier are dispersed in water (an aqueous solution containing a hot rolling oil composition and an emulsifier). is there. Therefore, hot rolling oil is prepared and used by diluting the hot rolling oil composition and the emulsifier in water.
The content of the hot rolling oil composition in the hot rolling oil is preferably 1 to 10% by mass from the viewpoint of rolling lubricity and plate surface quality.
In addition, although a hot rolling oil composition, an emulsifier, and water may be mixed in any order, it is preferable to mix a hot rolling oil composition after mixing water and an emulsifier.

[Rolling equipment]
Here, an example of the rolling apparatus for performing the rolling method of the aluminum plate or aluminum alloy plate which concerns on this invention is demonstrated.
FIG. 1 is a schematic diagram of an aluminum plate or aluminum alloy plate rolling apparatus.

In the rolling device 20, the aluminum plate or the aluminum alloy plate is hot-rolled by the hot rolling mill 3.
The used hot rolling oil used at the time of hot rolling is collected and stored in the hot rolling oil storage tank 4 through the pipe 9a.

  A scum removing device 1 is installed on the upper part of the hot rolling oil storage tank 4. The scum removing device 1 removes the scum that has floated due to the difference in specific gravity above the hot rolled oil in the hot rolled oil storage tank 4 by continuously rotating the belt-shaped metal band 10. The removed scum is stored in the drain tank 2 and then discarded. The metal powder contained in the hot rolling oil in the hot rolling oil storage tank 4 is also roughly removed by the scum removing device 1.

  The hot rolling oil from which the metal powder has been roughly removed is sent from the outlet provided at the bottom of the hot rolling oil storage tank 4 to the metal powder adjusted hot rolling oil storage tank 5 by the pump 7 through the pipe 9b. Be paid. A filter 6 is provided on the downstream side of the pressure pump 7 in the pipe 9b. The filter 6 removes fine metal powder and regulates the metal powder to a predetermined particle diameter and amount. Thus, after the particle diameter and amount of the metal powder are finally adjusted by the filter 6, the hot rolling oil is stored in the metal powder adjusting hot rolling oil storage tank 5.

The hot rolling oil in the metal powder adjusted hot rolling oil storage tank 5 is supplied to the hot rolling mill 3 by a pumping pump 8 through a pipe 9c.
Thus, the hot rolling oil circulates between the hot rolling mill 3, the hot rolling oil storage tank 4, and the metal powder adjusted hot rolling oil storage tank 5.

  In addition, control of the above-mentioned average oil particle diameter of hot rolling oil is performed in the hot rolling oil storage tank 4 shown in FIG. That is, the adjustment of the amount of cationic polymer compound (component (f)) to the hot rolling oil storage tank is controlled by adding the cationic polymer compound (component (f)) to the hot rolling oil storage tank 4. And adjusting the density. Moreover, the adjustment of the hot rolling oil agitation conditions in the hot rolling oil storage tank is adjusted by adjusting the output, the number of units, etc. of the pump (not shown) for agitating the hot rolling oil in the hot rolling oil storage tank 4 Then, it is performed by adjusting the stirring condition of the hot rolling oil (shearing condition of the oil particles of the hot rolling oil). Furthermore, the adjustment of the new oil exchange amount in the hot rolling oil storage tank is performed by exchanging (renewing) a part (or all) of the hot rolling oil in the hot rolling oil storage tank 4. This is done by adjusting the degree of deterioration.

  The aluminum plate or aluminum alloy plate rolling method according to the present invention is a combination of the above control methods, and the average oil particle size of hot-rolled oil is 3 to 3 while confirming the oil particle size with a coulter counter or the like. The hot rolling is performed while controlling in the range of 10 μm.

  As described above, the hot rolled oil of the present embodiment as described above is excellent in rolling lubricity and plate surface quality. Therefore, such a hot rolled oil is used, and the average oil particle diameter of the hot rolled oil is 3. By performing hot rolling while controlling in the range of 10 μm, it is possible to suppress the occurrence of seizure due to insufficient lubrication of the hot rolling oil and the occurrence of rolling oil residue on the surface of the sheet due to excessive lubrication. A quality rolled plate can be obtained.

  Since the hot rolling oil of this embodiment is also excellent in long-term circulation stability, stable hot rolling can be performed. Moreover, since there is little content of a fatty acid, corrosion of the steel material of a rolling mill and its peripheral equipment can be suppressed without adding a corrosion inhibitor.

  Since the hot rolling oil of the present embodiment has extremely excellent lubricity at the early stage of the building bath, it is possible to roll a high strength material immediately after the building bath. Moreover, since it is excellent in emulsifying long-term stability and roll coating control, it is possible to suppress the occurrence of poor biting or slip wrinkles even during long-term use, and to obtain excellent plate surface quality stably for a long period of time.

  The hot rolled oil of the present embodiment can improve the soiling of the housing around the tank and the mill, and prevent the generation of bacteria (antibacterial function) by the function of the cationic polymer compound (component (f)). Excellent drainage treatment. Further, since there is no excessive increase in the particle diameter, the oil particle diameter control and stabilization are excellent.

  The hot rolled oil of the present embodiment uses mineral oil as a base oil, oiliness improvers such as fatty acids, oils and fats, synthetic esters, higher alcohols, and, if necessary, extreme pressure agents, rust inhibitors, and antioxidants. Etc., and mainly emulsifying with an anionic surfactant, there is no seizure due to insufficient lubrication, and there is no deterioration of oil drainage on the plate surface due to oil deterioration during long-term use. Rolling becomes possible.

Hereinafter, the Example of the rolling method of the aluminum plate or aluminum alloy plate which concerns on this invention is described concretely compared with the comparative example.
The components shown in Table 1 were diluted with water to adjust the concentration to 4% by mass, and hot rolled oil was produced.

Using this hot rolling oil, an entrance side plate thickness: 29 mm, plate width: 1800 mm aluminum coil (JIS 5000 series material) was used as a rolling mill, a four-high rolling mill (work roll diameter: 725 mm, work roll barrel length; 2900 mm, backup roll diameter: 1530 mm, backup roll barrel length: 2900 mm) were hot-rolled using a 4-stand tandem in which four machines were connected.
The hot rolling conditions were as follows: rolling speed: 300 mpm, rolling reduction: 30-60%, material temperature: 300 ° C.

Under the above conditions, the average oil particle diameter of the hot rolling oil was changed (see FIG. 2, horizontal axis), and a hot rolling test was conducted in which 100 aluminum coils were hot rolled for each average oil particle diameter. Rolling lubricity and plate surface quality were evaluated.
The average oil particle diameter of the hot rolled oil is determined by checking the average oil particle diameter with a Coulter counter while stirring the amount of the cationic polymer compound (Table 1, (f) component) and hot rolled oil. Changed by adjusting the conditions.

About the plate | board surface property of the rolling plate (each 100 pieces) for every average oil particle diameter obtained by the above-mentioned hot rolling test, the presence or absence of seizure, slip wrinkles, and rolling oil residue was confirmed.
The evaluation of rolling lubricity and plate surface quality is the plate surface defect per 100 rolled plates, with the total number of rolled plates with seizure or slip flaws or rolling oil residue generated on the rolled plate surface as the number of plate surface defects. Rolls with 0 or 1 occurrence had good rolling lubricity and plate surface quality, and those with 2 or more occurrences of plate surface defects per 100 rolled plates were considered defective.

FIG. 2 is a graph showing the relationship between the average oil particle diameter of hot rolled oil and the number of defective plate surface occurrences. In FIG. 2, the unit “(book)” of the plate surface defect occurrence number means the plate surface defect occurrence number per 100 rolled plates.
As shown in FIG. 2, when the average oil particle diameter was 3 to 10 μm, the number of plate surface defects was 0 or 1, and the rolling lubricity and plate surface quality were good. On the other hand, when the average oil particle diameter was less than 3 μm, the total number of rolled sheets on which seizure occurred was 2 or more. In addition, when the average oil particle diameter exceeded 10 μm, the total number of rolled plates on which slip soot and rolling oil residue occurred was 2 or more.

  Thus, according to the rolling method of the aluminum plate or aluminum alloy plate according to the present invention, it is possible to suppress the occurrence of seizure due to insufficient lubrication of the hot rolling oil and the deterioration of the rolling oil drainability of the plate surface due to overlubrication. Therefore, it is possible to obtain a rolled plate with excellent plate surface quality.

  As mentioned above, although the rolling method of the aluminum plate or aluminum alloy plate which concerns on this invention was shown in detail, showing embodiment and an Example, this invention is not limited to these content. About a concrete structure, it can change suitably in the range which does not deviate from the meaning of this invention.

It is the schematic of the rolling apparatus of an aluminum plate or an aluminum alloy plate. It is a graph which shows the relationship between the average oil particle diameter of hot rolling oil, and the number of board surface defect generation | occurrence | production.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Scum removal apparatus 2 Drain tank 3 Hot rolling mill 4 Hot rolling oil storage tank 5 Metal powder adjustment hot rolling oil storage tank 6 Filter 7, 8 Pumping pump 9a, 9b, 9c Piping 10 Belt-shaped metal belt 20 Rolling apparatus

Claims (3)

A method of rolling an aluminum plate or an aluminum alloy plate that is hot-rolled using hot rolling oil,
A method for rolling an aluminum plate or an aluminum alloy plate, wherein hot rolling is performed by controlling an average oil particle diameter of the hot rolling oil in the range of 3 to 10 μm during the hot rolling. The hot rolling oil contains a hot rolling oil composition and an emulsifier,
The hot rolling oil composition is (a) a mineral oil having a kinematic viscosity of 80 mm ² / s (40 ° C.) or less;
(B) a fatty acid having 10 to 22 carbon atoms;
(C) at least one selected from natural fats and oils and monoesters derived from higher fatty acids or polybasic acids and alcohols;
(D) a higher alcohol having 8 to 26 carbon atoms;
The method for rolling an aluminum plate or an aluminum alloy plate according to claim 1, comprising: The emulsifier is a polymer or copolymer of a monomer represented by the following general formula (1) or a salt thereof or a quaternized product thereof, and has a mass average molecular weight of 10,000 to 1,000,000. The method for rolling an aluminum plate and an aluminum alloy plate according to claim 2, wherein the rolling method is at least one of the polymer compounds.

(In the formula, R ¹ is a hydrogen atom or a methyl group, R ² and R ³ are the same or different, an alkyl group having 1 to 3 carbon atoms, and m is an integer of 1 to 3).

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