JP3370873B2 - Rolling method of aluminum or aluminum alloy plate - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to aluminum or an aluminum alloy using a water-dispersed hot rolling oil excellent in rolling lubricity, plate surface quality and emulsion stability. The present invention relates to a method for rolling a sheet. [0002] In hot rolling of an aluminum or aluminum alloy plate, aluminum is transferred from the surface of the rolled plate to the surface of the roll, and a roll coating layer is formed on the roll surface. Rolling is performed in contact with the roll coating layer. Therefore, the surface quality of the rolled sheet depends on the properties of the roll coating layer. In addition, since the surface defects of the sheet generated during hot rolling affect the sheet surface quality after cold rolling, it can be said that the properties of the roll coating layer in hot rolling are extremely important. The properties of the roll coating layer vary depending on rolling conditions (sheet material, sheet temperature, brush roll operating conditions, etc.) and rolling oil. Therefore, the choice of rolling oil is essential in controlling the roll coating layer. [0003] Since hot rolling requires sufficient roll cooling, rolling oil is used in the form of an emulsion. For this reason, conventionally, as a hot rolling oil of aluminum or aluminum alloy, generally, a mineral oil as a base oil, an oiliness improver such as a fatty acid, a fat or oil and a fatty acid ester,
An extreme pressure agent, a rust inhibitor, an antioxidant, etc. are blended, and this is emulsified mainly with an anionic surfactant. Usually, an emulsified emulsion having a concentration of 3 to 10% and an oil particle size of 1 to 3 μm is used. ing. [0004] The properties required for the hot rolling oil of aluminum or aluminum alloy include lubricity, roll coating properties, surface quality, emulsion stability, workability, and wastewater treatment properties. The demand for hot rolling oils, such as lubricity, surface quality, and emulsion stability, has been increasing from the perspective of production and high quality of rolled aluminum products. [0005] However, hot rolling oils for aluminum or aluminum alloys using conventional emulsifiers do not fully satisfy all of the above requirements. In conventional rolling oils, lubricity is controlled by selecting the type and amount of emulsifier. However, in hot rolling oils using such emulsifiers, lubricity and emulsion stability are controlled. It shows a tendency to contradict the property, and it is not possible to satisfy both performances. That is, when the lubricating property is increased in the conventional rolling oil, the emulsifying stability is reduced, and as a result, the temporal stability of the lubricating property is reduced, so that the quality stability of the plate surface becomes a problem, while the emulsifying stability is increased. Thus, there is a problem that sufficient lubricity cannot be obtained, and as a result, various defects occur on the plate surface. [0007] In order to achieve both of the contradictory characteristics of lubricity and emulsion stability, for example, Japanese Patent Publication No.
No. 14599 proposes a rolling oil composition. In this rolling oil composition, lubricity and emulsification stability are certainly compatible and have some advantages not found in the prior art, but the surface quality of the obtained rolled plate is not always sufficient. On the other hand, as a similar attempt, JP-A-63-12
No. 0795 has been proposed. However, this is essentially the same quality as the technique described in Japanese Patent Publication No. 62-14599, and the surface quality is improved after sacrificing the lubricity from the selection range. . Thus, it is difficult for conventional lubricating oils to cope with mass production and high quality orientation in aluminum rolling. The inventors of the present invention have conducted intensive studies to solve the problems of the conventional hot rolling oils for aluminum and aluminum alloys. As a result, a specific lubricating oil component was mixed with a specific monomer. By emulsifying and dispersing in water using an organic acid salt of a polymer, the problem of deterioration in performance due to thermal deterioration during long-term use is improved while simultaneously satisfying lubricity, emulsion stability and plate surface quality. They found that and applied for a patent earlier (Japanese Patent Application Laid-Open No. 7-150189). However, although the hot-rolled oil composition has achieved its intended purpose, in hot rolling using this hot-rolled oil composition, biting due to over-lubrication has occurred. In some cases, defects occurred, and the rolling oil drainage property of the sheet surface was further deteriorated. The present invention has been made in view of such a problem, and can prevent the occurrence of biting failure due to excessive lubrication, improve the rolling oil drainage property of the sheet surface, and enable stable rolling. An object of the present invention is to provide a method for rolling an aluminum or aluminum alloy sheet. [0012] [Means for Solving the Problems] rolling method of aluminum or aluminum alloy plate according to the present invention, aluminum is recycled hot rolling oil and oil-in-water emulsion by the polymer compound of the cationic or in the rolling method of the aluminum alloy plate, hot rolling oil emulsion
The concentration of the hot rolling oil composition is ρ (%), and the material temperature is T
(° C.) , always during hot rolling (1100−
T) / 600 ≦ ρ ≦ (2100-2T) / 300, the oil concentration is controlled, and the oil concentration ρ is set to 1.5 to 4.
Control to 5% and average oil particle size to 5 ~ 15μm
It is characterized by controlling . A water-dispersed hot-rolling oil composition containing this cationic polymer compound is disclosed in Japanese Patent Application Laid-Open No. 7-150189.
In the use of this lubricating oil, by controlling the average oil particle diameter to 5 to 15 μm, there is no seizure due to insufficient lubrication, and the surface of the plate is over-lubricated and used for a long time. It is possible to perform stable rolling without deterioration of rolling oil drainability. The composition of the water-dispersed hot-rolled oil composition is as follows: (a) mineral oil having a viscosity of 80 cSt (40 ° C.) or less, (b) fatty acid having 10 to 22 carbon atoms, oil and fat, and 10 to 10 carbon atoms. One or more compounds selected from the group consisting of monoesters of 22 fatty acids and alcohols having 1 to 22 carbon atoms: 3 to 30% by mass , (c) the alkyl group or the alkenyl group has a carbon number of 4 to 1
Alkyl or alkenyl phosphate or alkyl or alkenyl phosphite which is 8:
5 to 10% by mass , (d) the following general formula (1): (Wherein, R ¹ is a hydrogen atom or a methyl group, R ² and R ³ are a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, m is an integer of 0 or 1, and n is an integer of 1 to 3 (Meth) acrylamide and / or (meth) acrylic acid salt, having an average molecular weight in the range of 10,000 to 1,000,000. R ⁴ COOH (wherein, R ⁴ represents an alkyl group having 1 to 5 carbon atoms, a hydroxyalkyl group, a carboxyalkyl group or a carboxyl group) Organic acid salt represented by: 0.1 to 10% by mass
Having a composition containing Each content is based on the rolling oil composition
% By weight, with the balance being the mineral oil. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As a result of further experimental studies by the present inventors, in rolling using this hot-rolled oil emulsion, mineral oil is used as a base oil and fatty acids, fats and oils, fatty acid esters and the like are removed. An oil-based improver, an extreme pressure agent, a rust inhibitor, an antioxidant, etc. are blended, and this is overlubricated at the same concentration (3 to 10%) as an emulsified emulsion mainly emulsified with an anionic surfactant. It has been found that the occurrence of poor biting due to cracking and the oil drainage of the plate surface deteriorate. That is, when hot rolling is performed using a hot-rolled oil which is an emulsion in which a cationic polymer compound having the above-mentioned composition has an oil content in water, lubrication is insufficient at an oil concentration of less than 1.5%. And seizure occurs,
At an oil concentration of more than 4.5%, poor biting occurs and an excessive amount of oil adheres, resulting in an oil residue pattern. Therefore, in the present invention, the oil concentration is set to 1.5 to 4.5%.
And According to the rolling method of the present invention, the oil concentration in the hot-rolled oil emulsion is ρ (%), and the material temperature is T
(1100-T) / 600 ≦ ρ ≦ (2
100-2T) / 300, for example,
By adjusting the amount of new oil exchange in the rolling oil tank to control the concentration, appropriate lubrication is obtained. Thus, using a mineral oil as a base oil, an oiliness improver such as a fatty acid, a fat or an oil and a fatty acid ester, an extreme pressure agent, a rust inhibitor, and an antioxidant were blended, and this was emulsified mainly with an anionic surfactant. Using rolling oil, at the same concentration (3 to 10%) as that of an emulsion having a normal oil particle size of 1 to 3 μm, stable rolling without occurrence of biting failure due to excessive lubrication and deterioration of oil drainage on the plate surface Becomes possible. Next, the water-dispersed hot rolling oil composition for aluminum or aluminum alloy will be described in detail. First, (a) of the hot rolling oil composition of the present invention
Examples of the mineral oil which is a component include spindle oil, machine oil, turbine oil, cylinder oil, neutral oil, and the like, and paraffinic mineral oil is more preferable in terms of heat resistance and lubricity. The viscosity of mineral oil is 80 cSt
(40 ° C.) or less, and if it exceeds 80 cSt, the quality of the plate surface will be reduced. The component (a) is a base oil, and its blending amount is not particularly limited.
0 to 96.4% by mass , particularly preferably 60 to 85% by mass . Among the components (b), 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. Examples of the fatty acid having 10 to 22 carbon atoms include capric acid, lauric acid, stearic acid, isostearic acid, oleic acid, and erucic acid.
Examples of the fatty acid monoester include a monoester of a fatty acid having 10 to 22 carbon atoms and an aliphatic monohydric alcohol having 1 to 22 carbon atoms, ethylene glycol, trimethylolpropane, pentaerythritol, glycerin, and more specifically, capric acid. Examples include methyl, butyl stearate, laurate oleate, 2-ethylhexyl erucate, pentaerythritol monooleate, glycerin monooleate and the like. These components (b) act as oiliness improvers and can be used alone or in combination of two or more. The addition amount is 3 to 30% by mass , more preferably 10 to 25% by mass , and 3% by mass .
If it is less than 30%, the lubricity decreases, and if it exceeds 30% by mass , the quality of the plate surface deteriorates. When fats and oils are blended, the amount of fats and oils is more preferably up to 20% by mass . The alkyl or alkenyl phosphate or alkyl or alkenyl phosphite as the component (c) has an alkyl or alkenyl group having 4 to 18 carbon atoms, and specific examples thereof include dibutyl phosphate and monooctyl. Phosphate, trioleyl phosphate, totibutyl phosphite, diisooctyl phosphite, trioleyl phosphite and the like, among mono-, di- or triester, alkyl- or alkenyl acid phosphate which is particularly mono- or diester Or, an alkyl or alkenyl acid phosphite is preferred. This addition amount is 0.5 to
10% by mass , more preferably 1 to 5% by mass ;
If the amount is less than 5% by mass, the quality of the plate surface is not improved, and if the amount exceeds 10% by mass , the quality of the plate surface cannot be expected to be improved by increasing the amount. As the polymer compound of the component (d), a copolymer of the monomer of the general formula (1) and (meth) acrylamide, a monomer of the general formula (1) and (meth) acrylate And a copolymer of a monomer (meth) acrylamide and a (meth) acrylate of the general formula (1). Among them, the molar ratio of the monomer of the general formula (1), (meth) acrylamide and (meth) acrylate is 50 to 50.
90: 0 to 20:10 to 50 are particularly preferred. Examples of the amine compound of the monomer represented by the general formula (1) include those having m = 1 as dimethylaminoethylacrylamide, dimethylaminopropylacrylamide, diethylaminomethylacrylamide, dimethylaminoethylmethacrylamide, dimethylaminopropylmethacrylamide, Examples of the compound having m = 0 such as diethylaminomethyl methacrylamide include allylamine, dimethylaminomethylethylene, diethylaminomethylethylene, dimethylaminomethylpropene, and diethylaminomethylpropene. Among them, those having m = 1 are particularly preferable. . Specific examples of particularly preferred monomer (1) include dimethylaminopropyl methacrylamide and dimethylaminopropyl acrylamide. As the (meth) acrylate, (meth) acrylate
Alkali metal (meth) acrylates such as sodium acrylate, potassium (meth) acrylate, monoethanolamine (meth) acrylate, diethanolamine (meth) acrylate, triethanolamine (meth) acrylate (Meth) acid organic amine salts. The high molecular compound of component (d) must have an average molecular weight in the range of 10,000 to 1,000,000, and if the average molecular weight is less than this range, the emulsion stability will be poor. If it exceeds this range, the stability of the polymer compound itself becomes poor or the viscosity becomes high, which makes the handling difficult, which is not preferable. A more preferred average molecular weight is 3
It is between 000 and 300,000. In formula (2), which represents an essential organic acid in the organic acid salt of the polymer compound (d), R ⁴ represents an alkyl group having 1 to 5 carbon atoms, and a hydroxyalkyl having 1 to 5 carbon atoms. Examples thereof include a carboxyalkyl group and a carboxyl group having 1 to 5 carbon atoms in the group and the alkyl portion, and among them, a hydroxyalkyl group having 1 to 5 carbon atoms is particularly preferred. R
⁴ COO ^- as a specific example of an acetate ion, propionate ion, butyrate ion, valerate ion, caproate ion, glycolate, lactate, hydroacrylic acid, oxalate, malonate ion, succinate ion , Glutaric acid ion, adipate ion and the like, but glycolate ion, lactate ion and hydroacrylate ion are particularly preferable. In the production of the polymer chemical, it is preferable to polymerize the monomer of the general formula (1) and then neutralize it with the organic acid of the general formula (2). The polymer may be polymerized using a product which has been previously neutralized with an organic acid of the general formula (2). For example, the component (d) can be obtained by polymerizing a neutralized product of glycolic acid of dimethylaminopropyl methacrylamide with another comonomer. The polymer compound (d) can be used alone or in combination of two or more kinds. The polymer compound is 0.1 to 10% by mass , preferably 0.1 to 10% by mass , based on the total amount of the hot rolling oil composition. It is blended so as to be 5 to 5% by mass . 10% by mass
When the value exceeds, the pressure resistance performance is reduced, and the seizure resistance is lowered, which is not preferable. The hot rolling oil composition for aluminum or aluminum alloy according to the present invention may further contain, if necessary, known additives such as a rust / corrosion inhibitor, an antioxidant, and an initial emulsifying property. An emulsifier or the like can be added for the purpose. As the rust preventive / anticorrosive, for example, alkenyl succinic acid and its derivatives, fatty acids such as oleic acid, esters such as sorbitan monooleate, and other amines can be used. Can be added up to 2% by mass . As the antioxidant, for example, 2,4
Phenolic compounds such as -di-tert-butyl-p-cresol and aromatic amines such as phenyl-α-naphthylamine can be used. These can be added up to 5% by mass with respect to the total amount of the rolling oil composition. Further, as the emulsifier, for example, anionic surfactants such as triethanolamine oleate and sodium petroleum sulfonate, and nonionic surfactants such as polyoxyethylene nonylphenyl ether can be used. , These are two types based on the total amount of the rolling oil composition.
It can be added to an amount%. In using the hot rolling oil composition for aluminum or aluminum alloy of the present invention, the composition is diluted with water. The dilution ratio at this time is not particularly limited, but it is usually preferable that the composition concentration is usually 1 to 30% by mass . The rolling oil composition of the present invention has an appropriate particle diameter due to the electric coagulation effect, steric hindrance effect, protective colloid effect, and high heat resistance of the polymer compound (d). Even under severe use conditions such as rolling, its uniform emulsifying dispersibility and particle size distribution can be kept stable for a long period of time, so that good initial rolling lubricity can be maintained for a long period of time. Further, the roll coating becomes uniform and thin due to the roll coating control effect of the oiliness improver (b) and the uniform wetting effect of the polymer compound (d). can get. EXAMPLES Examples of the present invention will be specifically described below in comparison with comparative examples. Using hot-rolled oil, which is an emulsion that has an oil content in water by a cationic polymer compound represented by the following formula,
Plate width; 1300 mm aluminum coil (JIS50
00 material) to a 4-high rolling mill (work roll diameter: 725m)
m, work roll barrel length; 2900 mm, backup roll diameter; 1530 mm, backup barrel length; 2
900 mm) was rolled in a four-stand tandem with four machines. Rolling speed: 300 mpm, rolling reduction: 30 to 60%, material temperature: 200 to 500 ° C., oil particle size: 5
The oil concentration was changed by adjusting the amount of fresh oil charged with the cationic polymer compound while confirming the oil concentration under the condition of 15 to 15 μm. By this rolling experiment, rolling lubricity and sheet surface quality were measured. The test hot rolling oil composition is as follows. (A) component: paraffinic mineral oil (70 cSt / 40 ° C.) 61.5% by mass (b) component: oleic acid 15.0% by mass lard 15.0% by mass (c) component: dilaurylphos Pfite 3.0% by mass (d) Component: Polymer dispersant (A) [Dimethylaminopropylacrylamide / acrylamide / sodium acrylate = 80/5/15 copolymerized acetic acid neutralized product (Mw = 400,000) 2.0% by mass Others; Tricresyl phosphate 2.0% by mass Antioxidant 1.0% by mass Nonionic surfactant (I) [Polyoxyethylene nonyl phenyl ether (HLB = 12.4)] 5% by mass Total 100.0% by mass . FIG. 1 is a graph showing the optimal control range of the oil concentration with respect to the material temperature, with the horizontal axis representing the material temperature T (° C.) and the vertical axis representing the oil concentration ρ (%). When the relationship between the oil concentration and the material temperature is in the region shown by hatching in FIG. 1, appropriate lubrication is obtained, and the occurrence of biting failure due to excessive lubrication is prevented, and the oil on the plate surface is drained. Excellent rollability and stable rolling were enabled. The range of the area indicated by the hatching is (1100-T) / 600
≦ ρ ≦ (2100-2T) / 300. FIG. 2 is a graph showing the relationship between the oil concentration on the horizontal axis and the total rolling load (Ton) on the four axes on the vertical axis. As shown in FIG. 2, lubrication was moderate when the oil concentration was 1.5 to 7%. On the other hand, when the oil concentration was less than 1%, the rolling load was high, and seizure occurred due to insufficient lubrication. When the oil concentration is 8%, the oil concentration is the same as that of the conventional rolling oil. In this case, although the rolling load is low, there is a problem that the oil remains on the plate surface due to excessive lubrication. On the other hand, FIG. 3 is a graph showing the relationship between the oil concentration and the seizure, residual rolling oil and poor biting, with the horizontal axis representing the oil concentration and the vertical axis representing the plate surface properties. As shown in FIG. 3, when the oil concentration is less than 1.5%, seizure often occurs, and when the oil concentration exceeds 4.5%, rolling oil residue and poor biting occur frequently. For this reason, the oil concentration is preferably 1.5 to 4.5%. On the other hand, FIG. 3 is a graph showing the relationship between the oil concentration and the seizure, residual rolling oil and poor biting, with the horizontal axis representing the oil concentration and the vertical axis representing the sheet surface properties. As shown in FIG. 3, when the oil concentration is less than 1.5%, seizure often occurs, and when the oil concentration exceeds 4.5%, rolling oil residue and poor biting occur frequently. For this reason, the oil concentration should be 1.5 to 4.5% .
You . According to the rolling method of the present invention, when the concentration of oil in a hot-rolled oil emulsion is ρ (%) and the material temperature is T (° C.), (1100−T) / 600 ≦ ρ ≦ (2100
Since the temperature and concentration of the rolling oil emulsion are controlled within the range of -2T) / 300, the occurrence of biting failure due to overlubrication can be prevented, the rolling oil drainage of the plate surface can be improved, and the present invention is more stable. Rolling is possible. As described above, the present invention has no change in the biting property at the time of hot rolling, has extremely excellent lubricity in the early stage of the bath, and has a high lubricity immediately after the bath, as compared with the conventional rolling method using rolling oil. Rolling of the strength material becomes possible. Further, there is no occurrence of long-term stability of emulsifying property and control of roll coating, and excellent plate surface quality can be obtained in a long-term stability. Furthermore, since the generation of bacteria can be prevented by the antibacterial function of the cationic polymer compound, the particle diameter does not become excessively large and the oil particle size control stability is excellent.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a graph showing an optimum control range of an oil concentration with respect to a material temperature of a hot-rolled oil emulsion. FIG. 2 is a graph showing the relationship between the oil concentration of a hot-rolled oil emulsion and the total rolling load in hot rolling. FIG. 3 is a graph showing the relationship between the oil content of the hot-rolled oil composition and the surface properties of the sheet after hot-rolling.

Continued on the front page (51) Int.Cl. ⁷ Identification code FI C10M 101: 00 C10M 105: 34 105: 34 137: 02 137: 02 149: 06 149: 06) C10N 20:00 Z C10N 20:00 20: 02 20:02 40:20 Z 40:20 (72) Inventor Hiroyuki Ando 15 Kinugaoka, Moka City, Tochigi Prefecture Inside the Kobe Steel Moka Works (72) Inventor Takayuki Fujimoto 15 Kinugaoka, Moka City, Tochigi Prefecture Address Kobe Steel, Ltd. Moka Works (72) Inventor Masahiro Hata 15 Kinugaoka, Moka-shi, Tochigi Prefecture Kobe Steel Works, Moka Works (56) References JP-A 7-150189 (JP, A) Kaihei 2-145692 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B21B 3/00 B21B 27/10 C10M 101/00-177/00

Claims (1)

(57) [Claims 1] (a) Mineral oil having a viscosity of 80 cSt (40 ° C.) or less, (b) fatty acids and oils having 10 to 22 carbon atoms, and fatty acids having 10 to 22 carbon atoms Or two or more compounds selected from the group consisting of monoesters of alcohols having 1 to 22 carbon atoms: 3 to 30% by mass of the rolling oil composition , and (c) carbon of an alkyl group or an alkenyl group. Number 4 to 1
Alkyl or alkenyl phosphate or alkyl or alkenyl phosphite which is 8: rolling
0.5 to 10% by mass of the oil composition , (d) the following general formula (Wherein R ¹ represents a hydrogen atom or a methyl group; R ² and R ³
Represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, and m represents 0
Or an integer of 1 and n is an integer of 1 to 3), and is a copolymer of at least one monomer represented by (meth) acrylamide and / or (meth) acrylate, General formula R ⁴ COOH (wherein R ⁴ is an alkyl group having 1 to 5 carbon atoms, a hydroxyalkyl group, a carboxyalkyl group or a carboxyl group) of a polymer compound having an average molecular weight in the range of 10,000 to 1,000,000 organic acid salt represented by a group): containing 0.1 to 10 wt% of the rolling oil composition was circulated using the balance being said mineral oil an oil-in-water hot-rolling oil composition a method of aluminum or an aluminum alloy composition hot rolling, the density of the hot-rolling oil composition in water oil droplets type hot rolling oil emulsion [rho (%), when the material temperature was T (° C.) , Hot rolling
Medium, always, (1100-T) / 600 ≦ ρ ≦ (2100
Controls oil concentration in the range of -2T) / 300, further oil
The concentration ρ is controlled to 1.5 to 4.5% and the average oil
A method for rolling an aluminum or aluminum alloy sheet, wherein the particle size is controlled to 5 to 15 μm .