JP2012213808A - Rolling method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rolling method for sufficiently inhibiting the production of a roll coating due to adhesion of a material on a work roll and holding sufficient workability, under severe lubrication conditions.SOLUTION: In the rolling method, rolling oil containing at least one of base oil selected from mineral oil, synthetic oil, and oil and fat is used to roll a metal material in an atmosphere of having a nitrogen concentration of 80 to 100 vol.%.

Description

  The present invention relates to a method for rolling a metal material.

  In the rolling process of metal materials, the more severe the lubrication conditions, the easier the metal material adheres, and material components accumulate on the surface of the work roll to form a roll coating. If this becomes significant, the workability is greatly impaired. It becomes. In order to prevent such material deposition, it is necessary to prevent adhesion of the material and improve workability and lubricity. And it is known that the addition of a fatty acid to rolling oil is effective in improving the workability and lubricity (see, for example, Non-Patent Document 1 below).

Tribologist Vol. 47, No. 4 (2002) p. 313

  However, when a large amount of fatty acid is added to the rolling oil, it causes an increase in the amount of abrasion powder generated, and the fatty acid tends to remain on the surface of the plate after rolling, which requires a lot of time for thermal degreasing.

  In addition, as another means for suppressing roll coating, there is a method of lowering the rolling speed and the rolling reduction, but this is not a fundamental solution because productivity is lowered.

  The present invention has been made in view of such circumstances, and sufficiently suppresses the generation of a roll coating resulting from the adhesion of a material onto a work roll under severe lubrication conditions, and sufficient processing. An object of the present invention is to provide a rolling method capable of maintaining the properties.

  In order to solve the above problems, the present invention uses a rolling oil containing at least one base oil selected from mineral oil, synthetic oil, and fats and oils, and rolls a metal material in an atmosphere having a nitrogen concentration of 80 to 100% by volume. A rolling method is provided.

  According to the rolling method of the present invention, it is possible to sufficiently suppress the generation of a roll coating resulting from the adhesion of a material onto a work roll and maintain sufficient workability under severe lubrication conditions. It becomes.

  Hereinafter, preferred embodiments of the present invention will be described in detail.

  The rolling oil used in the rolling method of the present invention contains at least one base oil selected from mineral oil, synthetic oil and fats and oils. As such base oil, mineral oil or synthetic oil is particularly preferred.

  Examples of mineral oil that can be used in the present invention include, for example, a kerosene fraction obtained by distillation of a paraffinic or naphthenic crude oil; a normal paraffin obtained by an extraction operation from the kerosene fraction; and a paraffinic or naphthenic fraction. Synthetic wax (Fischer-Tropsch wax, GTL wax, etc.) obtained by a lubricating oil fraction obtained by distillation of crude oil, or a wax (slack wax, etc.) obtained by a lubricant dewaxing process and / or a gas-liquid (GTL) process ) As a raw material, and one or two or more refining treatments such as solvent removal, solvent extraction, hydrocracking, hydroisomerization, solvent dewaxing, catalytic dewaxing, hydrorefining, sulfuric acid washing, clay treatment, etc. as appropriate Paraffinic mineral oil, naphthenic mineral oil, normal paraffinic base oil, Paraffin based base oil.

  The aromatic content in the mineral oil is not particularly limited, but it is preferably 30% by volume or less, more preferably 20% by volume or less from the viewpoint of the working environment. Here, the aromatic content means a value measured according to the fluorescent indicator adsorption method of JIS K 2536 “Petroleum products-hydrocarbon type test”.

  The naphthene content in the mineral oil is not particularly limited, but is preferably 10% by volume or more, more preferably 15% by volume or more, still more preferably 20% by volume or more, still more preferably 25% by volume or more, most preferably. Is 30% by volume or more. By setting the naphthene content to 10% by volume or more, oil agent removability and processability in the oil agent removing step are improved. On the other hand, the naphthene content is preferably 90% by volume or less, more preferably 80% by volume or less, still more preferably 75% by volume or less, and most preferably 70% by volume or less. By making the naphthene content 90% by volume or less, volatilization of the oil agent at room temperature can be prevented.

  The paraffin content in the mineral oil is not particularly limited, but is preferably 5% by volume or more, more preferably 10% by volume or more, and further preferably 20% by volume or more. By setting the paraffin content to 5% by volume or more, the odor of the oil agent can be prevented. On the other hand, the paraffin content is preferably 90% by volume or less, more preferably 80% by volume or less, and still more preferably 70% by volume or less. By making the paraffin content 90% by volume or less, it is possible to improve the effect of preventing adhesion during processing.

  In the present invention, the naphthene content and the paraffin content are determined by the molecular ion intensity obtained by mass spectrometry by FI ionization (using a glass reservoir). The measurement method is specifically shown below.

(1) An adsorption tube for elution chromatography having a diameter of 18 mm and a length of 980 mm is packed with 120 g of silica gel (grade 923 manufactured by Fuji Devison Chemical Co., Ltd.) activated by drying at about 175 ° C. for 3 hours. .
(2) Inject 75 ml of n-pentane and pre-wet the silica gel.
(3) About 2 g of the sample is precisely weighed, diluted with an equal volume of n-pentane, and the obtained sample solution is injected.
(4) When the liquid level of the sample solution reaches the upper end of the silica gel, 140 ml of n-pentane is injected to separate the saturated hydrocarbon component, and the eluate is recovered from the lower end of the adsorption tube.
(5) Apply the eluate to a rotary evaporator to distill off the solvent to obtain a saturated hydrocarbon component.
(6) Type analysis of saturated hydrocarbon components with a mass spectrometer. As an ionization method in mass spectrometry, FI ionization method using a glass reservoir is used, and JMS-AX505H manufactured by JEOL Ltd. is used as a mass spectrometer.

The measurement conditions are shown below.
Acceleration voltage: 3.0 kV, cathode voltage: −5 to −6 kV, resolution: about 500, emitter: carbon, emitter current: 5 mA, measurement range: mass number 35 to 700, auxiliary oven temperature: 300 ° C., separator temperature: 300 ° C, main oven temperature: 350 ° C, sample injection volume: 1 μl.

The resulting molecular ion by mass spectrometry after isotope correction, paraffins from the mass number _{(C n H 2n + 2)} and naphthenes _{(C n H 2n, C n} H 2n-2, C n H 2n-4 ...) Are classified and arranged, the fraction of each ionic strength is obtained, and the content of each type with respect to the entire saturated hydrocarbon component is determined. Next, based on the content of the saturated hydrocarbon component, the content of paraffin and naphthene for the entire sample is determined.

  Details of data processing by the FI method mass spectrometry type analysis method are described in “Nisseki Review”, Vol. 33, No. 4, pages 135-142, particularly “2.2.3 Data Processing”. .

The initial boiling point of mineral oil is preferably 150 ° C. or higher, more preferably 155 ° C. or higher, and still more preferably 160 ° C. or higher. By setting the initial boiling point of mineral oil to 150 ° C. or higher, volatilization of the oil agent at room temperature can be sufficiently prevented. On the other hand, the end point of the mineral oil is preferably 480 ° C. or less, more preferably 470 ° C. or less, and further preferably 450 ° C. or less. By making the end point of mineral oil into 480 degrees C or less, the oil agent removability in an oil agent removal process can be made favorable. Further, the temperature difference between the initial boiling point and the end point of the mineral oil is preferably 100 ° C. or less, more preferably 90 ° C. or less, still more preferably 80 ° C. or less. By setting the temperature difference to 100 ° C. or less, it is possible to achieve both prevention of volatilization of the oil agent at room temperature and oil agent removability in the oil agent removing step. Here, the first stop point and end point are JIS K 2254.
It means a value measured according to “Petroleum product-distillation test method”.

  Examples of synthetic oils that can be used in the present invention include olefin oligomers (propylene oligomers, isobutylene oligomers, polybutenes, 1-octene oligomers, 1-decene oligomers, ethylene-propylene oligomers, etc.) or their hydrides, alkylbenzenes, alkylnaphthalenes. , Diesters (ditridecyl glutarate, di-2-ethylhexyl adipate, diisodecyl adipate, ditridecyl adipate, di-2-ethylhexyl sebacate, etc.), polyol esters (trimethylolpropane caprylate, trimethylolpropane pelargonate, pentaerythritol 2) -Ethyl hexanoate, pentaerythritol pelargonate, etc.), polyglycol, silicone oil, dialkyl diphenyl ether, and Polyphenyl ether and the like. Among these, propylene oligomer hydride, isobutylene oligomer hydride and polybutene hydride are collectively called isoparaffin.

  Examples of the fats and oils that can be used in the present invention include beef tallow, lard, soybean oil, rapeseed oil, rice bran oil, coconut oil, palm oil, palm kernel oil, hydrogenated products thereof, or a mixture of two or more of these. .

The kinematic viscosity at 40 ° C. of the base oil is preferably 1.0 to 50 mm ² / s, more preferably 1.2 to 40 mm ² / s, and still more preferably 1.4 to 35 mm ² / s. When the kinematic viscosity of the base oil is less than the lower limit value, the lubricity tends to decrease, and when the upper limit value is exceeded, there may be a problem in supplying the oil to the processed part.

The optimum viscosity of the base oil can be appropriately selected according to the purpose of use. In the case of aluminum rolling, the kinematic viscosity of the base oil at 40 ° C. is preferably 1.0 to 10 mm ² / s, more preferably 1.2 to 8.0 mm ² / s, and still more preferably 1.4 to 6.0 mm. ² / s. In the case of rolling a metal other than aluminum, the kinematic viscosity of the base oil at 40 ° C. is preferably 2.0 to 50 mm ² / s, more preferably 2.5 to 40 mm ² / s, and still more preferably 3.0. ˜30 mm ² / s. When the kinematic viscosity at 40 ° C. of the base oil is less than the lower limit, there is a risk of increasing the risk of fire and the like due to ignition. On the other hand, if the upper limit is exceeded, seizure of a lubricating oil component called stain is likely to occur after annealing, surface gloss deterioration due to occurrence of surface damage called oil pits on the workpiece surface, slip due to over-lubrication There is a risk of increasing the amount of wear powder generated, scratching the surface of the workpiece, and inability to process if the slip is significant.

The rolling oil used in the present invention can contain an oxygen-containing compound in order to further improve workability. Examples of such oxygen-containing compounds include at least one oxygen-containing compound selected from the group consisting of the following components (A1) to (A8).
(A1) Alkylene oxide adduct of polyhydric alcohol having 3 to 6 hydroxyl groups having a number average molecular weight of 100 or more and 1000 or less (A2) Hydrocarbyl ether or hydrocarbyl ester of component (A1) (A3) having a number average molecular weight of 100 1000 or less polyalkylene glycol (A4) Hydrocarbyl ether or hydrocarbyl ester of component (A3) (A5) Dihydric alcohol having 2 to 20 carbon atoms (A6) Hydrocarbyl ether or hydrocarbyl ester of component (A5) (A7) C3-C20 trihydric alcohol (A8) Hydrocarbyl ether or hydrocarbyl ester of component (A7) above.

(A1) The polyhydric alcohol which comprises a component has 3-6 hydroxyl groups. In addition to the following polyhydric alcohols, saccharides can also be used as the polyhydric alcohol having 3 to 6 hydroxyl groups.
Examples of the polyhydric alcohol include glycerin, polyglycerin (a dimer to tetramer of glycerin, such as diglycerin, triglycerin, and tetraglycerin), trimethylol alkane (for example, trimethylolethane, trimethylolpropane, and trimethylolbutane), And 2- to 4-mer thereof, pentaerythritol, dipentaerythritol, 1,2,4-butanetriol, 1,3,5-pentanetriol, 1,2,6-hexanetriol, 1,2,3,4 -Butanetetrol, sorbitol, sorbitan, sorbitol glycerin condensate, adonitol, arabitol, xylitol, mannitol, idylitol, taritol, dulcitol, allitol and the like.

  Examples of the saccharide include xylose, arabinose, ribose, rhamnose, glucose, fructose, galactose, mannose, sorbose, cellobiose, mannose, isomaltose, trehalose, sucrose and the like. Among these, glycerin, trimethylol alkane, and sorbitol are preferable from the viewpoint of excellent processability.

  Moreover, as alkylene oxide which comprises (A1) component, C2-C6, Preferably C2-C4 alkylene oxide is used. Examples of the alkylene oxide having 2 to 6 carbon atoms include ethylene oxide, propylene oxide, 1,2-epoxybutane (α-butylene oxide), 2,3-epoxybutane (β-butylene oxide), 1,2-epoxy-1- Examples include methylpropane, 1,2-epoxyheptane, and 1,2-epoxyhexane. Among these, ethylene oxide, propylene oxide, and butylene oxide are preferable from the viewpoint of excellent processability, and ethylene oxide and propylene oxide are more preferable.

  When two or more kinds of alkylene oxide are used, there is no particular limitation on the polymerization mode of the oxyalkylene group, and random copolymerization or block copolymerization may be performed. Moreover, when adding an alkylene oxide to the polyhydric alcohol which has 3-6 hydroxyl groups, you may add to all the hydroxyl groups, and you may add to only one hydroxyl group. Among these, it is preferable to add to all hydroxyl groups from the viewpoint of excellent processability.

  Furthermore, the number average molecular weight (Mn) of the component (A1) is 100 or more and 1000 or less, preferably 100 or more and 800 or less. When Mn is less than 100, the solubility in mineral oil may be reduced. On the other hand, when Mn is larger than 1000, the oil agent may remain on the surface of the processed material after the processing in the oil agent removing step. In addition, Mn in this invention says the number average molecular weight of conversion of the standard polystyrene by gel permeation chromatography (GPC).

  As (A1) component, you may use what added the alkylene oxide to the polyhydric alcohol which has 3-6 hydroxyl groups so that Mn may be 100-1000. In addition, a mixture of polyhydric alcohol alkylene oxide adducts having 3 to 6 hydroxyl groups obtained by an arbitrary method or a commercially available mixture of polyhydric alcohol alkylene oxide adducts having 3 to 6 hydroxyl groups is distilled. Alternatively, those separated so that Mn may be 100 or more and 1000 or less by chromatography may be used. In addition, as (A1) component, you may use these compounds individually or in mixture of 2 or more types.

  Component (A2) is a hydrocarbyl etherified or esterified polyhydric alcohol alkylene oxide adduct having 3 to 6 hydroxyl groups with Mn of 100 or more and 1000 or less, preferably 100 or more and 800 or less.

  As the component (A2), there can be used one obtained by hydrocarbyl etherifying or esterifying part or all of the terminal hydroxyl groups of the alkylene oxide adduct of the component (A1). The hydrocarbyl group mentioned here is an alkyl group having 1 to 24 carbon atoms, an alkenyl group having 2 to 24 carbon atoms, a cycloalkyl group having 5 to 7 carbon atoms, an alkylcycloalkyl group having 6 to 11 carbon atoms, or 6 carbon atoms. Represents a hydrocarbon group having 1 to 24 carbon atoms such as an aryl group having 10 to 10 carbon atoms, an alkylaryl group having 7 to 18 carbon atoms, and an arylalkyl group having 7 to 18 carbon atoms.

  Examples of the alkyl group having 1 to 24 carbon atoms include methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group, sec-butyl group, t-butyl group, linear or branched pentyl. Group, linear or branched hexyl group, linear or branched heptyl group, linear or branched octyl group, linear or branched nonyl group, linear or branched decyl group, linear or Branched undecyl group, linear or branched dodecyl group, linear or branched tridecyl group, linear or branched tetradecyl group, linear or branched pentadecyl group, linear or branched hexadecyl group Linear or branched heptadecyl group, linear or branched octadecyl group, linear or branched nonadecyl group, linear or branched icosyl group, linear or branched heicosyl group, linear or branched Branch Cosyl group, straight or branched tricosyl group, tetracosyl group of straight or branched may be mentioned.

  Examples of the alkenyl group having 2 to 24 carbon atoms include a vinyl group, a linear or branched propenyl group, a linear or branched butenyl group, a linear or branched pentenyl group, and a linear or branched hexenyl group. , Linear or branched heptenyl group, linear or branched octenyl group, linear or branched nonenyl group, linear or branched decenyl group, linear or branched undecenyl group, linear or branched A branched dodecenyl group, a linear or branched tridecenyl group, a linear or branched tetradecenyl group, a linear or branched pentadecenyl group, a linear or branched hexadecenyl group, a linear or branched heptadecenyl group, Linear or branched octadecenyl group, linear or branched nonadecenyl group, linear or branched icocenyl group, linear or branched henicosenyl group, linear or branched dococenyl group Group, straight or branched tricosenyl group, tetracosenyl group of straight or branched may be mentioned.

  Examples of the cycloalkyl group having 5 to 7 carbon atoms include a cyclopentyl group, a cyclohexyl group, and a cycloheptyl group. Examples of the alkylcycloalkyl group having 6 to 11 carbon atoms include methylcyclopentyl group, dimethylcyclopentyl group (including all structural isomers), methylethylcyclopentyl group (including all structural isomers), and diethylcyclopentyl group ( Including all structural isomers), methylcyclohexyl group, dimethylcyclohexyl group (including all structural isomers), methylethylcyclohexyl group (including all structural isomers), diethylcyclohexyl group (all structures) Isomers), methylcycloheptyl group, dimethylcycloheptyl group (including all structural isomers), methylethylcycloheptyl group (including all structural isomers), diethylcycloheptyl group (all Including structural isomers).

  Examples of the aryl group having 6 to 10 carbon atoms include a phenyl group and a naphthyl group. Examples of the alkylaryl group having 7 to 18 carbon atoms include a tolyl group (including all structural isomers), a xylyl group (including all structural isomers), and an ethylphenyl group (including all structural isomers). ), Linear or branched propylphenyl group (including all structural isomers), linear or branched butylphenyl group (including all structural isomers), linear or branched pentylphenyl Groups (including all structural isomers), linear or branched hexylphenyl groups (including all structural isomers), linear or branched heptylphenyl groups (including all structural isomers). ), Linear or branched octylphenyl group (including all structural isomers), linear or branched nonylphenyl group (including all structural isomers), linear or branched decylphenyl Group (including all structural isomers) .), Including straight-chain or branched undecylphenyl (all structural isomers.), Including straight-chain or branched dodecylphenyl group (all structural isomers.), And the like.

  Examples of the arylalkyl group having 7 to 12 carbon atoms include benzyl group, phenylethyl group, phenylpropyl group (including propyl group isomers), phenylbutyl group (including butyl group isomers), and phenylpentyl group ( Pentyl group isomers), phenylhexyl group (including hexyl isomers), and the like.

  Among these, from the viewpoint of excellent processability, a linear or branched alkyl group having 2 to 18 carbon atoms and a linear or branched alkenyl group having 2 to 18 carbon atoms are preferable, and a carbon number of 3 to 12 is preferable. A linear or branched alkyl group or an oleyl group (residue obtained by removing a hydroxyl group from oleyl alcohol) is more preferred.

  As the acid used for esterification, carboxylic acid is usually mentioned. The carboxylic acid may be a monobasic acid or a polybasic acid, but a monobasic acid is usually used. Examples of monobasic acids include fatty acids having 6 to 24 carbon atoms, which may be linear or branched. The monobasic acid may be a saturated fatty acid, an unsaturated fatty acid, or a mixture thereof.

  Saturated fatty acids include linear or branched hexanoic acid, linear or branched octanoic acid, linear or branched nonanoic acid, linear or branched decanoic acid, linear or branched undecanoic acid, Linear or branched dodecanoic acid, linear or branched tridecanoic acid, linear or branched tetradecanoic acid, linear or branched pentadecanoic acid, linear or branched hexadecanoic acid, linear or branched Octadecanoic acid, linear or branched hydroxyoctadecanoic acid, linear or branched nonadecanoic acid, linear or branched eicosanoic acid, linear or branched heneicosanoic acid, linear or branched docosanoic acid, Examples thereof include linear or branched tricosanoic acid, linear or branched tetracosanoic acid, and the like.

  Examples of unsaturated fatty acids include linear or branched hexenoic acid, linear or branched heptenoic acid, linear or branched octenoic acid, linear or branched nonenic acid, linear or branched decenoic acid , Linear or branched undecenoic acid, linear or branched dodecenoic acid, linear or branched tridecenoic acid, linear or branched tetradecenoic acid, linear or branched pentadecenoic acid, linear or branched Branched hexadecenoic acid, linear or branched octadecenoic acid, linear or branched hydroxyoctadecenoic acid, linear or branched nonadecenoic acid, linear or branched eicosenoic acid, linear or branched heneicosene Examples thereof include acid, linear or branched docosenoic acid, linear or branched tricosenoic acid, and linear or branched tetracosenoic acid.

  Of these, saturated fatty acids having 8 to 20 carbon atoms, unsaturated fatty acids having 8 to 20 carbon atoms, and mixtures thereof are particularly preferable. In addition, as (A2) component, you may use these compounds individually or in mixture of 2 or more types.

  The component (A3) is a polyalkylene glycol having a Mn of 100 or more and 1000 or less, and one obtained by homopolymerizing or copolymerizing an alkylene oxide having 2 to 6 carbon atoms, preferably 2 to 4 carbon atoms. Examples of the alkylene oxide having 2 to 6 carbon atoms include the alkylene oxides listed in the description of the component (A1). Among these, ethylene oxide, propylene oxide, and butylene oxide are preferable from the viewpoint of excellent processability, and ethylene oxide and propylene oxide are more preferable.

  In addition, when 2 or more types of alkylene oxide is used at the time of preparation of polyalkylene glycol, there is no restriction | limiting in particular in the polymerization form of an oxyalkylene group, You may carry out random copolymerization or block copolymerization.

  Moreover, as (A3) component, Mn is 100 or more and 1000 or less, Preferably it is 120 or more and 700 or less. A polyalkylene glycol having an Mn of less than 100 may reduce the solubility in mineral oil. On the other hand, polyalkylene glycol with Mn greater than 1000 may cause the oil to remain on the surface of the processed material after processing in the oil agent removing step.

  Furthermore, as the component (A3), a component that is reacted so that Mn is 100 or more and 1000 or less when the alkylene oxide is polymerized may be used. Moreover, you may use what isolate | separated the polyalkylene glycol mixture obtained by arbitrary methods, and the commercially available polyalkylene glycol mixture so that Mn might be set to 100 or more and 1000 or less by distillation or chromatography. In addition, as (A3) component, you may use these compounds individually or in mixture of 2 or more types.

  The component (A4) is obtained by hydrocarbyl etherification or esterification of polyalkylene glycol having Mn of 100 or more and 1000 or less, preferably 120 or more and 700 or less. As the component (A4), hydrocarbyl etherified or esterified part or all of the terminal hydroxyl groups of the polyalkylene glycol of the component (A3) can be used. The hydrocarbyl group as used herein represents a hydrocarbon group having 1 to 24 carbon atoms, and specifically includes the groups listed in the description of the component (A2). Among these, from the viewpoint of excellent processability, a linear or branched alkyl group having 2 to 18 carbon atoms and a linear or branched alkenyl group having 2 to 18 carbon atoms are preferable, and a carbon number of 3 to 12 is preferable. A linear or branched alkyl group or an oleyl group (residue obtained by removing a hydroxyl group from oleyl alcohol) is more preferred.

  Further, as the component (A4), those obtained by esterifying the terminal hydroxyl group of the polyalkylene glycol of the component (A3) can also be used. As the acid used for esterification, a carboxylic acid is usually used. The carboxylic acid may be a monobasic acid or a polybasic acid, but a monobasic acid is usually used. Specific examples include those listed in the description of the component (A2). In addition, as the component (A4), these compounds may be used alone or as a mixture of two or more.

  The component (A5) is a dihydric alcohol having 2 to 20 carbon atoms, preferably 3 to 18 carbon atoms. A dihydric alcohol here means what has no ether bond in a molecule | numerator. Examples of the dihydric alcohol having 2 to 20 carbon atoms include ethylene glycol, 1,3-propanediol, 1,2-propanediol, 1,4-butanediol, 1,2-butanediol, and 2-methyl-1,3. -Propanediol, 1,5-pentanediol, 1,2-pentanediol, neopentyl glycol, 1,6-hexanediol, 1,2-hexanediol, 2-ethyl-2-methyl-1,3-propanediol 2-methyl-2,4-pentanediol, 1,7-heptanediol, 1,2-heptanediol, 2-methyl-2-propyl-1,3-propanediol, 2,2-diethyl-1,3 -Propanediol, 1,8-octanediol, 1,2-octanediol, 1,9-nonanediol, 1,2-nonanediol, 2- Til-2-ethyl-1,3-propanediol, 1,10-decanediol, 1,2-decanediol, 1,11-undecanediol, 1,2-undecanediol, 1,12-dodecanediol, 1, 2-dodecanediol, 1,13-tridecanediol, 1,2-tridecanediol, 1,14-tetradecanediol, 1,2-tetradecanediol, 1,15-heptadecanediol, 1,2-heptadecanediol 1,16-hexadecanediol, 1,2-hexadecanediol, 1,17-heptadecanediol, 1,2-heptadecanediol, 1,18-octadecanediol, 1,2-octadecanediol, 1,19-nona Decanediol, 1,2-nonadecanediol, 1,20-icosadecanediol, , 2-equalizer Sade Kanji ol, and the like.

  Among these, 1,4-butanediol, 1,5-pentanediol, neopentyl glycol, 1,6-hexanediol, 2-methyl-2,4-pentanediol, 2- Ethyl-2-methyl-1,3-propanediol, 1,7-heptanediol, 1,8-octanediol, 1,9-nonanediol, 1,10-decanediol, 1,11-undecanediol, 1, 12-dodecanediol and the like are preferable. In addition, as (A5) component, you may use these compounds individually or in mixture of 2 or more types.

  Component (A6) is a hydrocarbyl etherified or esterified dihydric alcohol having 2 to 20 carbon atoms, preferably 3 to 18 carbon atoms (excluding those having an ether bond in the molecule). It is a thing. As the component (A6), a hydrocarbyl etherified part or all of the terminal hydroxyl groups of the dihydric alcohol of the component (A5) can be used. The hydrocarbyl group as used herein represents a hydrocarbon group having 1 to 24 carbon atoms, and specifically includes the groups listed in the description of the component (A2). Among these, from the viewpoint of excellent processability, a linear or branched alkyl group having 2 to 18 carbon atoms and a linear or branched alkenyl group having 2 to 18 carbon atoms are preferable, and a carbon number of 3 to 12 is preferable. A linear or branched alkyl group or an oleyl group (residue obtained by removing a hydroxyl group from oleyl alcohol) is more preferable.

  As the component (A6), one obtained by esterifying one or both of the terminal hydroxyl groups of the dihydric alcohol of the component (A5) can also be used. As the acid used for esterification, carboxylic acid is usually mentioned. The carboxylic acid may be a monobasic acid or a polybasic acid, but a monobasic acid is usually used. Specific examples include those listed in the description of the component (A2). Furthermore, the ester of the component (A6) may be one obtained by esterifying one of the terminal hydroxyl groups of the dihydric alcohol of the component (A5) (partial ester), or one obtained by esterifying both of the terminal hydroxyl groups (completely). Ester). In these, it is preferable that it is a partial ester from the point which is excellent in workability. In addition, as (A6) component, you may use these compounds individually or in mixture of 2 or more types.

  The component (A7) is a trivalent alcohol having 3 to 20 carbon atoms, preferably 3 to 18 carbon atoms. The trihydric alcohol here means one having no ether bond in the molecule. Examples of the trihydric alcohol having 3 to 20 carbon atoms include glycerin, 1,2,3-butanetriol, 1,2,4-butanetriol, 1,2,5-pentanetriol, 1,3,5-pentanetriol, 1,2,3-pentanetriol, 1,2,4-pentanetriol, 1,2,6-hexanetriol, 1,2,3-hexanetriol, 1,2,4-hexanetriol, 1,2,5 -Hexanetriol, 1,3,4-hexanetriol, 1,3,5-hexanetriol, 1,3,6-hexanetriol, 1,4,5-hexanetriol, 1,2,7-heptanetriol, 1 , 2,8-octanetriol, 1,2,9-nonanetriol, 1,2,10-decanetriol, 1,2,11-undecantriol, 1,2, 2-dodecanetriol, 1,2,13-tridecanetriol, 1,2,14-tetradecanetriol, 1,2,15-pentadecanetriol, 1,2,16-hexadecanetriol, 1,2,17- Examples include heptadecane triol, 1,2,18-octadecane triol, 1,2,19-nonadecane triol, 1,2,20-icosan triol.

  Among these, 1,2,12-dodecanetriol, 1,2,13-tridecanetriol, 1,2,14-tetradecanetriol, 1,2,15-pentadecanetriol, , 2,16-hexadecanetriol, 1,2,17-heptadecanetriol, 1,2,18-octadecanetriol are preferred. In addition, as (A7) component, you may use these compounds individually or as a 2 or more types of mixture.

  Component (A8) is a hydrocarbyl etherified or esterified trihydric alcohol having 3 to 20 carbon atoms, preferably 3 to 18 carbon atoms (excluding those having an ether bond in the molecule). It is a thing. As the component (A8), hydrocarbyl etherified part or all of the terminal hydroxyl groups of the trihydric alcohol of the component (A7) can be used. The hydrocarbyl group as used herein represents a hydrocarbon group having 1 to 24 carbon atoms, and specifically includes the groups listed in the description of the component (A2). Among these, from the viewpoint of excellent processability, a linear or branched alkyl group having 2 to 18 carbon atoms and a linear or branched alkenyl group having 2 to 18 carbon atoms are preferable, and a carbon number of 3 to 12 is preferable. A linear or branched alkyl group or an oleyl group (residue obtained by removing a hydroxyl group from oleyl alcohol) is more preferred.

  Moreover, as (A8) component, what esterified one or all of the terminal hydroxyl group of the trihydric alcohol of (A7) component can be used. As the acid used for esterification, carboxylic acid is usually mentioned. The carboxylic acid may be a monobasic acid or a polybasic acid, but a monobasic acid is usually used. Specific examples include those listed above for the component (A2). The ester of the component (A8) may be one obtained by esterifying one or two terminal hydroxyl groups of the trihydric alcohol of the component (A7) (partial ester), and all the terminal hydroxyl groups are esterified. (Complete ester) may be sufficient. In these, it is preferable that it is a partial ester from the point which is excellent in workability.

  As the component (A8), glycerin, 1,2,3-butanetriol, 1,2,4-butanetriol, 1,2,5-pentanetriol, 1,3,5-pentane among the components (A7) Triol, 1,2,3-pentanetriol, 1,2,4-pentanetriol, 1,2,6-hexanetriol, 1,2,3-hexanetriol, 1,2,4-hexanetriol, 1, Hydrocarbyl ethers or partial esters of 2,5-hexanetriol, 1,3,4-hexanetriol, 1,3,5-hexanetriol, 1,3,6-hexanetriol and 1,4,5-hexanetriol Is preferred. In addition, as (A8) component, you may use these compounds individually or in mixture of 2 or more types.

  In the present invention, one oxygen-containing compound selected from the components (A1) to (A8) may be used alone, or a mixture of two or more oxygen-containing compounds having different structures may be used. Good. Among the above components (A1) to (A8), the component (A3), the component (A4), the component (A5), and the component (A8) are preferable from the viewpoint of excellent workability, and the component (A3), (A4) The component and the component (A8) are more preferable.

  The content of oxygen-containing compounds in the rolling oil used in the present invention is preferably 0.005% by mass or more, more preferably 0.05% by mass or more, and still more preferably 0.1% by mass, based on the total amount of rolling oil. % Or more. On the other hand, the content of the oxygen-containing compound is preferably 10% by mass or less, more preferably 5.0% by mass or less, and still more preferably 2.0% by mass or less, based on the total amount of rolling oil. If the content of the oxygen-containing compound is less than the lower limit, the effect of improving the workability tends to be insufficient, and even if the content exceeds the upper limit, the effect commensurate with the content tends not to be obtained.

The rolling oil used in the present invention can further contain an oily agent. As the oily agent, those used as oily agents for general lubricating oils can be used, but in order to further improve processability, at least selected from the following components (B1) to (B3) One oily agent is preferably used.
(B1) Ester (B2) Monohydric alcohol (B3) Carboxylic acid

  The ester which is the component (B1) is obtained by reacting an alcohol with a carboxylic acid. The alcohol may be a monohydric alcohol or a polyhydric alcohol. The carboxylic acid may be a monobasic acid or a polybasic acid.

  As the monohydric alcohol, a monohydric alcohol having 1 to 24 carbon atoms is usually used. Such alcohols may be linear or branched. Examples of the monohydric alcohol having 1 to 24 carbon atoms include methanol, ethanol, linear or branched propanol, linear or branched butanol, linear or branched pentanol, linear or branched hexanol, direct Linear or branched heptanol, linear or branched nonanol, linear or branched decanol, linear or branched undecanol, linear or branched dodecanol, linear or Branched tridecanol, linear or branched tetradecanol, linear or branched pentadecanol, linear or branched hexadecanol, linear or branched heptadecanol, linear or branched Octadecanol, linear or branched nonadecanol, linear or branched eicosanol, linear or branched heneicosanol, linear Other branched Torikosanoru, straight or branched tetracosanol, and mixtures thereof.

  As the polyhydric alcohol, a dihydric alcohol having 2 to 10 valences, preferably 2 to 6 valences is usually used. Examples of the 2- to 10-valent alcohol include ethylene glycol, diethylene glycol, polyethylene glycol (3 to 15 mer of ethylene oxide), propylene glycol, dipropylene glycol, polypropylene glycol (3 to 15 mer of propylene oxide), and 1,3-propane. Diol, 1,2-propanediol, 1,3-butanediol, 1,4-butanediol, 2-methyl-1,2-propanediol, 2-methyl-1,3-propanediol, 1,2-pentane Diol, 1,3-pentanediol, 1,4-pentanediol, 1,5-pentanediol, neopentylglycol, glycerin, polyglycerin (diglycerin dimer to octamer, such as diglycerin, triglycerin, tetraglycerin ), Trimethylol al (For example, trimethylolethane, trimethylolpropane, trimethylolbutane) and their 2-8 mer, pentaerythritol and their 2-4 mer, 1,2,4-butanetriol, 1,3,5 -Pentanetriol, 1,2,6-hexanetriol, 1,2,3,4-butanetetrol, sorbitol, sorbitan, sorbitol glycerin condensate, adonitol, arabitol, xylitol, mannitol and the like.

  In addition, saccharides such as xylose, arabitol, ribose, rhamnose, glucose, fructose, galactose, mannose, sorbose, cellobiose, mannose, isomaltose, trehalose, sucrose can be used.

  Among these, ethylene glycol, diethylene glycol, polyethylene glycol (more preferably, 3-10 mer of ethylene oxide), propylene glycol, dipropylene glycol, polypropylene glycol (more preferably, 3-10 mer of propylene oxide), 1, 3-propanediol, 2-methyl-1,2-propanediol, 2-methyl-1,3-propanediol, neopentyl glycol, glycerin, diglycerin, triglycerin, trimethylol alkane (for example, trimethylol ethane, tri Methylolpropane, trimethylolbutane) and their dimers and tetramers, pentaerythritol, dipentaerythritol, 1,2,4-butanetriol, 1,3,5-pentanetriol, 1,2,6- Hexane triol, 2,3,4-butane tetrol, sorbitol, sorbitan, sorbitol glycerin condensate, adonitol, arabitol, xylitol, divalent to hexavalent polyhydric alcohols, and mixtures thereof, such as mannitol and the like are more preferable. More preferred are ethylene glycol, propylene glycol, neopentyl glycol, glycerin, trimethylol ethane, trimethylol propane, pentaerythritol, sorbitan and mixtures thereof.

  Moreover, as a monobasic acid which comprises an ester oily agent, the linear or branched fatty acid which has C6-C24 normally is mentioned. The monobasic acid may be a saturated fatty acid, an unsaturated fatty acid, or a mixture thereof.

  Saturated fatty acids include linear or branched hexanoic acid, linear or branched octanoic acid, linear or branched nonanoic acid, linear or branched decanoic acid, linear or branched undecanoic acid , Linear or branched dodecanoic acid, linear or branched tridecanoic acid, linear or branched tetradecanoic acid, linear or branched pentadecanoic acid, linear or branched hexadecanoic acid, linear or branched Branched octadecanoic acid, linear or branched hydroxyoctadecanoic acid, linear or branched nonadecanoic acid, linear or branched eicosanoic acid, linear or branched heneicosanoic acid, linear or branched docosanoic acid , Linear or branched tricosanoic acid, linear or branched tetracosanoic acid and the like.

  Examples of unsaturated fatty acids include linear or branched hexenoic acid, linear or branched heptenoic acid, linear or branched octenoic acid, linear or branched nonenic acid, linear or branched decenoic acid , Linear or branched undecenoic acid, linear or branched dodecenoic acid, linear or branched tridecenoic acid, linear or branched tetradecenoic acid, linear or branched pentadecenoic acid, linear or branched Branched hexadecenoic acid, linear or branched octadecenoic acid, linear or branched hydroxyoctadecenoic acid, linear or branched nonadecenoic acid, linear or branched eicosenoic acid, linear or branched heneicosene Examples thereof include acid, linear or branched docosenoic acid, linear or branched tricosenoic acid, and linear or branched tetracosenoic acid. Of these, saturated fatty acids having 8 to 20 carbon atoms, unsaturated fatty acids having 8 to 20 carbon atoms, and mixtures thereof are particularly preferable.

  Examples of the polybasic acid constituting the ester oil-based agent include dibasic acids having 2 to 16 carbon atoms and trimellitic acid. The dibasic acid having 2 to 16 carbon atoms may be linear or branched, and may be a saturated dibasic acid, an unsaturated dibasic acid, or a mixture thereof.

  Saturated dibasic acids include ethanedioic acid, propanedioic acid, linear or branched butanedioic acid, linear or branched pentanedioic acid, linear or branched hexanedioic acid, linear or branched Branched octanedioic acid, linear or branched nonanedioic acid, linear or branched decanedioic acid, linear or branched undecanedioic acid, linear or branched dodecanedioic acid, linear or branched Examples include branched tridecanedioic acid, linear or branched tetradecanedioic acid, linear or branched heptadecanedioic acid, linear or branched hexadecanedioic acid, and the like.

  Examples of unsaturated dibasic acids include linear or branched hexene diacids, linear or branched octene diacids, linear or branched nonene diacids, linear or branched decene diacids, linear Or branched undecenedioic acid, linear or branched dodecenedioic acid, linear or branched tridecenedioic acid, linear or branched tetracenedioic acid, linear or branched heptacenedioic acid, linear Or a branched hexadecenedioic acid etc. are mentioned.

Examples of the ester oil-based agent include the following components (B1-1) to (B1-7). As the ester oily agent, an ester obtained by reacting an arbitrary alcohol with a carboxylic acid can be used as in these exemplified components, and is not particularly limited thereto.
(B1-1) Ester of monohydric alcohol and monobasic acid (B1-2) Ester of polyhydric alcohol and monobasic acid (B1-3) Ester of monohydric alcohol and polybasic acid (B1-4) Esters of polyhydric alcohols and polybasic acids (B1-5) Monohydric alcohols and mixtures of polyhydric alcohols, mixed esters of polybasic acids (B1-6) polyhydric alcohols, monobasic acids and polybasic acids Mixed ester with a mixture of (B1-7) A mixed ester of a mixture of monohydric alcohol and polyhydric alcohol with a mixture of monobasic acid and polybasic acid.

  In addition, when a polyhydric alcohol is used as the alcohol component, the ester is a complete ester in which all hydroxyl groups in the polyhydric alcohol are esterified. When a polybasic acid is used as the carboxylic acid component, the ester may be a complete ester in which all carboxyl groups in the polybasic acid are esterified, and a part of the carboxyl group is not esterified. It may be a partial ester remaining as a carboxyl group.

  As the ester oily agent, any of the above-mentioned ones can be used. From the viewpoint of excellent processability, (B1-1) an ester of a monohydric alcohol and a monobasic acid and (B1-3) a monohydric alcohol Esters with polybasic acids are preferred. Particularly in aluminum fin processing and aluminum rolling, (B1-1) an ester of a monohydric alcohol and a monobasic acid is more preferable. In rolling metal other than aluminum, (B1-1) a monohydric alcohol and a monobasic acid are used. (B1-1) An ester of a monohydric alcohol and a monobasic acid and (B1-3) an ester of a monohydric alcohol and a polybasic acid are most preferred.

  The total carbon number of the ester of (B1-1) monohydric alcohol and monobasic acid used as the oily agent is not particularly limited, but the total carbon number of the ester is preferably 7 or more from the viewpoint of improving processability. The above is more preferable, and 11 or more is most preferable. Further, from the viewpoint of oil agent removability, the total carbon number of the ester is preferably 26 or less, more preferably 24 or less, and most preferably 22 or less. Although there is no restriction | limiting in particular in carbon number of the said monohydric alcohol, C1-C10 is preferable, C1-C8 is more preferable, C1-C6 is still more preferable, C1-C4 is the most preferable. . Although there is no restriction | limiting in particular in carbon number of the said monobasic acid, C8-22 is preferable, C10-20 is more preferable, C12-18 is the most preferable. It is preferable to set the total carbon number, the carbon number of the alcohol, and the carbon number of the monobasic acid as described above. The upper limit value is likely to increase the occurrence of stain and corrosion, In consideration of the point that the fluidity is lost and the handling becomes difficult and the possibility that the solubility in the base oil is reduced and the precipitation is increased. This is because the working environment deteriorates due to odor.

The form of the ester of (B1-3) monohydric alcohol and polybasic acid used as the oily agent in the present invention is not particularly limited, but is a diester represented by the following formula (1) or an ester of trimellitic acid. It is preferable.
R ¹ —O—CO (CH ₂ ) _n CO—O—R ² (1)
(In the general formula (1), R ¹ and R ² are the same or different groups and represent a hydrocarbon group having 3 to 10 carbon atoms, and n represents 4 to 8)

R ¹ and R ² in the general formula (1) may be a hydrocarbon group having 3 or more carbon atoms from the viewpoint that the effect of improving the lubricating performance may not be expected or the working environment is deteriorated by odor. preferable. In addition, there is a greater risk of increasing the occurrence of stains and corrosion, a greater risk of losing fluidity and difficulty in handling in winter, and a greater risk of precipitation due to a decrease in solubility in base oil. Therefore, R ¹ and R ² in the general formula (1) are preferably hydrocarbon groups having 10 or less carbon atoms. In addition, there is a greater risk of increasing the occurrence of stains and corrosion, a greater risk of losing fluidity and difficulty in handling in winter, and a greater risk of precipitation due to a decrease in solubility in base oil. Therefore, n in the general formula (1) is preferably 8 or less. On the other hand, n is preferably 4 or more from the viewpoint that the effect of improving the lubrication performance may not be expected or the working environment is deteriorated by odor. Among these, n = 4 and 6 are particularly preferable from the viewpoint of availability of raw materials and price.

Examples of R ¹ and R ² in the general formula (1) include an alkyl group, an alkenyl group, an alkylcycloalkyl group, an alkylphenyl group, and a phenylalkyl group, and an alkyl group is particularly preferable. The alkyl group includes a linear alkyl group or a branched alkyl group, and a linear alkyl group and a branched alkyl group may be mixed, but a branched alkyl group is preferable. Examples of R ¹ and R ² include a linear or branched propyl group, a linear or branched butyl group, a linear or branched pentyl group, a linear or branched hexyl group, and a linear or branched heptyl group. A linear or branched octyl group, a linear or branched nonyl group, a linear or branched decyl group, and the like.

  The diester represented by the general formula (1) can be obtained by any method. For example, a linear saturated dicarboxylic acid having 6 to 10 carbon atoms (adipic acid, pimelic acid, corkic acid, azelaic acid in this order from 6 carbon atoms) , Sebacic acid) or a derivative thereof and an alcohol having 3 to 10 carbon atoms are exemplified. The carbon number of the monohydric alcohol for esterifying trimellitic acid is not particularly limited, but there is a greater risk of increasing the occurrence of stains and corrosion, and there is a greater risk of loss of fluidity and difficulty in handling in winter. From the point that the solubility in oil decreases and the risk of precipitation increases, the number of carbon atoms is preferably 1 to 10, more preferably 1 to 8 carbon atoms, still more preferably 1 to 6 carbon atoms, and more preferably 1 to 1 carbon atoms. 4 is most preferred. The ester of trimellitic acid may be a partial ester (monoester or diester) or a complete ester (triester).

  Examples of the monohydric alcohol of the component (B2) include the compounds listed as the alcohol constituting the ester in the description of the component (B1). As the monohydric alcohol, the total carbon number of the monohydric alcohol is preferably 6 or more, more preferably 8 or more, and most preferably 10 or more from the viewpoint of superior processability. Further, from the viewpoint of oil agent removability, the total carbon number of the monohydric alcohol is preferably 20 or less, more preferably 18 or less, and most preferably 16 or less.

  The carboxylic acid as component (B3) may be a monobasic acid or a polybasic acid. As such carboxylic acid, the compound illustrated as carboxylic acid which comprises ester in description of the said (B1) component is mentioned, for example. Among these, a monobasic acid is preferable from the viewpoint of superior processability. Moreover, from the point which is excellent in workability, 6 or more are preferable, as for the total carbon number of carboxylic acid, 8 or more are more preferable, and 10 or more are the most preferable. Moreover, from the point of oil agent removal property, the total carbon number of carboxylic acid is preferably 22 or less, more preferably 20 or less, and most preferably 18 or less.

  As the oily agent in the rolling oil used in the present invention, only one kind selected from the above-mentioned various oily agents may be used alone or as a mixture of two or more, but the workability can be further improved. 1) Esters having 7 to 26 carbon atoms in total obtained from monohydric alcohols and monobasic acids, (2) Monohydric alcohols having 6 to 20 carbon atoms, particularly monohydric alcohols having 9 or more carbon atoms and 8 or less carbon atoms Of monohydric alcohol, (3) monobasic acid having 6 to 20 carbon atoms, or a mixture thereof.

  In the case of aluminum rolling, the content of the oily agent is preferably 0.01% by mass or more, more preferably 0.05% by mass or more, and still more preferably 0 from the viewpoint of workability, based on the total amount of rolling oil. 0.07% by mass or more. On the other hand, the content of the oil agent is preferably 30% by mass or less, more preferably 20% by mass or less, still more preferably 15% by mass or less, and particularly preferably 10% by mass or less from the viewpoint of oil agent removal.

  On the other hand, when rolling a metal material other than aluminum, the content of the oily agent is preferably 1% by mass or more, more preferably 2% by mass or more, and still more preferably from the viewpoint of workability, based on the total amount of rolling oil. 3% by mass or more. On the other hand, the content of the oily agent is preferably 70% by mass or less, more preferably 65% by mass or less, still more preferably 60% by mass or less, and particularly preferably 55% by mass or less from the viewpoint of oil agent removability.

  In addition, the rolling oil used in the present invention further improves its excellent effect, so that an extreme pressure additive, an antioxidant, a rust inhibitor, a corrosion inhibitor, an antifoaming agent, an anti-emulsifier, Additives such as fungicides can be further contained alone or in combination of two or more.

  Examples of extreme pressure additives include phosphorus compounds such as tricresyl phosphate, and organometallic compounds such as zinc dialkyldithiophosphate. Examples of the antioxidant include phenolic compounds such as 2,6-ditertiary butyl-p-cresol (DBPC), aromatic amines such as phenyl-α-naphthylamine, and organometallic compounds such as zinc dialkyldithiophosphate. Examples of rust inhibitors include salts of fatty acids such as oleic acid, sulfonates such as dinonylnaphthalene sulfonate, partial esters of polyhydric alcohols such as sorbitan monooleate, amines and derivatives thereof, phosphate esters and derivatives thereof. It is done. Examples of the corrosion inhibitor include benzotriazole. Examples of antifoaming agents include silicone-based ones. Surfactant is used as demulsifier, quaternary ammonium salt, imidazoline type as cationic system, sulfated oil, aerosol type as anion system, castor oil ethylene oxide adduct as nonionic system, phosphoric acid of ether type nonionic surfactant Examples thereof include esters, block copolymers of ethylene oxide and propylene oxide, and esters with dimer acid. Examples of mold inhibitors include phenol compounds, formaldehyde donor compounds, salicylanilide compounds, and the like.

  The total content of the additives is preferably 15% by mass or less, more preferably 10% by mass or less, based on the total amount of rolling oil.

  The rolling oil used in the present invention can be used in a non-water state that does not substantially contain water except natural moisture at the time of storage, but can further contain water depending on the case. Can also be used in combination with water. When the rolling oil used in the present invention contains water, an emulsified state in which water is used as a continuous phase and the oil component is finely dispersed therein to form an emulsion; a solubilized state in which water is dissolved in the oil component; or It can take any form of a suspension in which water and oil are mixed by vigorous stirring. Moreover, rolling oil and water can be separately supplied to the processing site for use. By simply diluting the rolling oil (stock solution) with water or using it together with water, it can be used as a metalworking oil for actual use. The dilution ratio (when used in combination, the ratio of the stock solution + water to the stock solution is the dilution factor) is arbitrarily selected depending on the use conditions, but generally the stock solution is 2 to 100 times by weight, preferably 3 It is customary to obtain practical metalworking fluids by diluting up to 70 times with water. In this case, tap water, industrial water, ion exchange water, distilled water, etc. can be used as the dilution water, and it does not matter whether it is hard water or soft water. In the case of an emulsion type, when rolling oil is diluted with water, water is used as a continuous phase, and an emulsion in which oil components are finely dispersed is obtained. However, the average particle diameter of oil droplets dispersed in water is 300 nm or less, In particular, it is preferably 100 nm or less. This is because if the average particle size of the dispersed oil droplets is large, oil pits are easily generated and the surface gloss of the processed product is impaired, and a fine filter cannot be used for cleaning the metalworking fluid.

The viscosity of the rolling oil used in the present invention is not particularly limited, but the kinematic viscosity at 40 ° C. is 0.5 to 50 mm ² / s, preferably 1.0 to 40 mm ² / s. In the aluminum rolling, in view of lubricity and surface quality, and preferably from 1.0 to 10 mm ² / s, more preferably 1.0~8.0mm ² / s. In the rolling process of metal materials other than aluminum, the thickness is preferably 1.0 to 50 mm ² / s, more preferably 2.0 to 40 mm ² / s, and most preferably 3.0 to 30 mm ² / s.

  In the rolling method of the present invention, the metal material is rolled in an atmosphere having a nitrogen concentration of 80 to 100% by volume using the rolling oil. The nitrogen concentration in the atmosphere during rolling is preferably 85 to 100% by volume, more preferably 88 to 100% by volume. When the nitrogen concentration is less than the lower limit, it is not possible to sufficiently suppress the formation of a roll coating resulting from the adhesion of the material onto the work roll.

In the rolling method of the present invention, the atmosphere during rolling may contain an oxygen component in addition to nitrogen. The oxygen concentration in the atmosphere during rolling is preferably 18% by volume or less, more preferably 15%. The capacity is less than%. In the rolling method of the present invention, a rare gas such as helium, neon, or argon, or carbon dioxide can be used instead of nitrogen.

  The metal material used in the rolling method of the present invention is not particularly limited. For example, aluminum, magnesium, and transition metals such as copper, iron, chromium, nickel, zinc, tin, titanium, and alloys thereof are preferably used. it can. The processing method is preferably applied to cold rolling, but can also be applied to warm and hot rolling. Further, the present invention is applicable to press, punching, ironing, drawing, drawing, forging, cutting, grinding, etc., which are metal processing other than rolling.

  EXAMPLES Hereinafter, although this invention is demonstrated more concretely based on an Example and a comparative example, this invention is not limited to a following example at all.

[Examples 1-6, Comparative Examples 1-6]
In Examples 1 to 6, the rolling oils 1 and 2 and the work materials 1 to 6 shown below are combined as shown in Table 1, and the nitrogen concentration in the atmosphere during rolling is controlled to the value shown in Table 1. A rolling test was conducted. Further, in Comparative Examples 1 to 6, the rolling oils 1 and 2 and the work materials 1 to 6 shown below are combined as shown in Table 2, and the concentration in the atmosphere during rolling is not controlled (that is, air) A rolling test was carried out (under atmosphere).
(Rolling oil)
Rolling oil 1: 92.0% by mass of mineral oil having a kinematic viscosity of 2.8 mm ² / s at 40 ° C., 7.0% by mass of lauryl alcohol, 1.0% by mass of butyl stearate
Rolling oil 2: 90.0% by mass of mineral oil having a kinematic viscosity of 7.0 mm ² / s at 40 ° C., 10.0% by mass of butyl stearate
(Work material)
Material 1: Aluminum (JIS A1050) (0.5mm thickness / 72mm width)
Material 2: Aluminum alloy (JIS A5052) (0.5mm thickness / 72mm width)
Material 3: Pure copper (JIS C1100) (0.5 mm thickness / 48 mm width)
Material 4: Brass (JIS C2600) (0.5 mm thickness / 48 mm width)
Material 5: Phosphor bronze (JIS C5191) (0.5 mm thickness / 48 mm width)
Material 6: Stainless steel SUS304 (0.5 mm thickness / 48 mm width).

The conditions in the rolling test were as follows.
Work roll diameter: 50mm
Work roll roughness: 0.3 μm
Rolling speed: 95m / min
Rolling rate: Start with a rolling rate of 15% and increase it stepwise.
Atmosphere conditions: In the case of Examples 1 to 6, the nitrogen concentration in the nitrogen atmosphere is controlled by spraying nitrogen gas onto the roll bite portion with a nitrogen cylinder from the rolling material entering side. In the case of Comparative Examples 1 to 6, normal rolling in an air atmosphere is performed without controlling the nitrogen concentration. The main component of the remaining component is oxygen.

  In the above rolling test, the maximum rolling reduction that can be normally rolled when the rolling reduction was increased stepwise was determined. The obtained results are shown in Tables 1 and 2.

Claims (1)

  A rolling method comprising rolling a metal material in an atmosphere having a nitrogen concentration of 80 to 100% by volume using a rolling oil containing at least one base oil selected from mineral oil, synthetic oil and fat.