TWI649416B - Water-soluble cutting oil stock solution composition, cutting oil composition and cutting processing method - Google Patents

Abstract

The water-soluble cutting fluid stock solution composition of the present invention contains at least 1 selected from the group consisting of aromatic tertiary amines and heterocyclic tertiary amines based on the total stock composition as a basis of 0.3 mass% or more and 7.0 mass% or less An amine compound, water of 0.1% by mass or more and 5.0% by mass or less, and mineral oil of 70% by mass or more and 98% by mass or less.

Description

Water-soluble cutting oil stock solution composition, cutting oil composition and cutting processing method

The present invention relates to a water-soluble cutting fluid stock solution composition, a water-soluble cutting fluid composition, and a cutting method, in particular, to a process suitable for processing aluminum or its alloys, copper or its alloys, or steel A water-soluble cutting oil composition for cutting materials, a stock solution composition in which the water-soluble cutting oil composition can be obtained by dilution with water, and a cutting method using the above-mentioned water-soluble cutting oil composition.

When cutting steel, non-ferrous metal materials, such as rotary cutting, flat cutting, hole drilling, milling, etc., cutting oil is used. The purpose of using cutting oil is to reduce the friction between the tool and the material or debris to be processed, to remove the debris, to prevent the edge of the cutting edge from generating chips, to suppress heat generation and cooling, etc., thereby to improve the tool life or working accuracy .

Generally speaking, cutting oils are roughly divided into water-insoluble cutting oils whose main purpose is lubrication and water-soluble cutting oils whose main purpose is cooling. Previous water-soluble cutting oils were formulated with surfactants such as polyoxyethylene monoalkyl ethers, polyoxyethylene monoalkyl phenyl ethers, fatty acid salts, and sulfonates; oily fatty acids, partial esters of polyhydric alcohols, etc. Agents; extreme pressure additives such as polyoxyethylene phosphate; rust inhibitors such as amines, phosphates, molybdates, tungstates, borates, nitrites, etc. (for example, see Patent Document 1).

Water-soluble cutting oils are usually used by diluting them to about 5 to 50 times with water.

It can be seen from this that the performance required for the water-soluble cutting oil is cooling, that is, the workability of which is utilized. If the cooling is not sufficient, the heat is not removed during processing and the material to be shaved is welded to Tools become a situation of poor processing. In addition, in order to use water-soluble cutting oils stably, emulsification stability and corrosion resistance are also emphasized. If the emulsification stability is not sufficient, not only the oil is separated into water and oil, and the performance as designed cannot be obtained, but also the abrasion powder of the cut metal is aggregated and attached to the material. If so, it must be removed in a subsequent step, so productivity is reduced. Corrosion resistance is also an important performance. Water-soluble cutting oils containing more water are prone to multiply bacteria or mildew. If they spoil, their performance will be reduced, or the working environment will be greatly reduced due to this odor.

[Prior Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. 08-239683

The object of the present invention is to provide a water-soluble cutting oil composition which is excellent in emulsification stability, corrosion resistance and workability, and is suitable for the cutting of processed materials including aluminum or its alloys, copper or its alloys, or steel. A stock solution composition obtained by diluting with water to obtain a water-soluble cutting oil composition, and a cutting method using the water-soluble cutting oil composition.

In order to solve the above-mentioned problems, the present invention provides the water-soluble cutting oil stock solution composition described in the following [1] to [3], the cutting oil composition described in the following [4] and the cutting process described in the following [5] method.

[1] A water-soluble cutting oil stock solution composition containing 0.3 mass% or more and 7.0 mass% or less selected from aromatic tertiary amines and heterocyclic tertiary amines based on the total stock composition At least one amine compound, 0.1 mass% or more and 5.0 mass% or less of water, and 70 mass% or more and 98 mass% or less of mineral oil.

[2] The water-soluble cutting oil stock solution composition as described in [1], wherein The aromatic component is 10% by mass or more.

[3] The water-soluble cutting oil stock solution composition as described in [1] or [2], wherein the above-mentioned heterocyclic tertiary amine is di Porphyrin or N-ethyl Porphyrin.

[4] A water-soluble cutting oil composition, which is obtained by diluting the water-soluble cutting oil stock solution composition according to any one of [1] to [3] to 5 times or more and 50 times or less with water .

[5] A cutting method that uses a water-soluble cutting oil composition as described in [4] to cut a material to be cut including at least one metal selected from aluminum and its alloys, copper and its alloys, and steel.

According to the present invention, there is provided a water-soluble cutting oil composition which is excellent in emulsification stability, corrosion resistance and workability, and is suitable for the cutting of processed materials including aluminum or its alloys, copper or its alloys or steel A stock solution composition obtained by diluting with water to obtain a water-soluble cutting oil composition and a cutting method using the above-mentioned water-soluble cutting oil composition.

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

[First embodiment: water-soluble cutting oil stock solution composition]

The water-soluble cutting oil composition (hereinafter, also simply referred to as "stock solution composition") of the first embodiment of the present invention contains 0.3% by mass or more and 7.0% by mass or less selected from aromatic based on the total amount of the stock solution composition At least one amine compound of the family tertiary amines and heterocyclic tertiary amines, water of 0.1% by mass or more and 5.0% by mass or less, and mineral oil of 70% by mass or more and 98% by mass or less.

Examples of the aromatic tertiary amines include triphenylamine, tri (methylphenyl) amine, tri (ethylphenyl) amine, tri (propylphenyl) amine, tri (butylphenyl) amine , Tris (phenoxyphenyl) Amine, tris (benzylphenyl) amine, diphenylmethylamine, diphenylethylamine, diphenylpropylamine, diphenylbutylamine, diphenylhexylamine, diphenylcyclohexyl Amine, N, N'-dimethylaniline, N, N'-diethylaniline, N, N'-dipropylaniline, N, N'-dibutylaniline, N, N'-dihexylaniline , N, N'-dicyclohexylaniline, (methylphenyl) dimethylamine, (ethylphenyl) dimethylamine, (propylphenyl) dimethylamine, (butylphenyl) Dimethylamine, bis (methylphenyl) methylamine, bis (ethylphenyl) methylamine, bis (propylphenyl) methylamine, bis (butylphenyl) methylamine, N , N'-bis (hydroxyethyl) aniline, N, N'-bis (hydroxypropyl) aniline, N, N'-bis (hydroxybutyl) aniline, and diisopropanol-p-toluidine. Among them, tri (methylphenyl) amine, tri (ethylphenyl) amine, and tri (propylphenyl) amine are preferred from the viewpoint of emulsion stability and corrosion resistance.

Specific examples of heterocyclic tertiary amines include, for example, pyridine-based compounds such as picoline, isoquinoline, and quinoline, imidazole-based compounds, pyrazole-based compounds, Porphyrin compounds, piper Compounds, piperidine compounds.

Furthermore, examples of the pyridine-based compound include N, N′-dimethyl-4-aminopyridine, bipyridine, and 2,6-lutidine. Among them, N, N'-dimethyl-4-aminopyridine is preferred from the viewpoint of emulsion stability and corrosion resistance.

In addition, examples of the imidazole-based compound include 1-benzyl-2-methylimidazole, 1-cyanoethyl-2-methylimidazole, 1-cyanoethyl-2-benzimidazole, and 1-cyanoethyl- 2-ethyl-4-imidazole, 1-cyanoethyl-2-undecylimidazole, 1-cyanoethyl-2-methylimidazolium trimellitate, 1-cyanoethyl-2-decyl Monoalkylimidazolium trimellitate, 1-benzyl-2-benzimidazole, 1- (2-hydroxyethyl) imidazole, 1-benzyl-2-methylimidazole, 1-benzyl-imidazole and 1-allyl imidazole and so on. Among them, 1-benzyl-2-methylimidazole and 1-benzyl-2-benzimidazole are preferred from the viewpoint of emulsion stability and corrosion resistance.

Examples of pyrazole compounds include pyrazole and 1,4-dimethylpyrazole. Among them, from the viewpoints of emulsification stability and corrosion resistance, pyrazole is preferred.

As Porphyrin compounds include: Porphyrin, di Porphyrin, 4- (2-hydroxyethyl) Porphyrin, N-ethyl Porphyrin, N-methyl Porphyrin and 2,2'-di Phosphorus diethyl ether, etc. Among them, from the viewpoint of emulsification stability and corruption resistance, two Porphyrin, 4- (2-hydroxyethyl) Porphyrin, N-ethyl Porphyrin.

As piper Compounds, including 1- (2-hydroxyethyl) piper Or N, N'-dimethylpiper Wait. Among them, from the viewpoint of emulsion stability and corrosion resistance, N, N'-dimethylpiperate is preferred .

Examples of the piperidine-based compound include N- (2-hydroxyethyl) piperidine, N-ethylpiperidine, N-propylpiperidine, N-butylpiperidine, N-hexylpiperidine, and N- Cyclohexyl piperidine and N-octyl piperidine etc. Among them, N- (2-hydroxyethyl) piperidine, N-propylpiperidine, and N-butylpiperidine are preferred from the viewpoint of emulsion stability and corrosion resistance.

In this embodiment, only one of aromatic tertiary amines or heterocyclic tertiary amines may be used, or one or more of aromatic tertiary amines may be One or more types of grade amines are used in combination. From the viewpoints of emulsification stability and corrosion resistance, heterocyclic tertiary amines are more preferred, and among heterocyclic tertiary amines, preferred is Porphyrin Series II Porphyrin, 4- (2-hydroxyethyl) Porphyrin, N-ethyl Porphyrin, preferably two Porphyrin, N-ethyl Porphyrin.

The content of the aromatic tertiary amines and / or heterocyclic tertiary amines is 0.3% by mass or more, preferably 0.5% by mass or more, and more preferably 1.0% by mass or more based on the total amount of the stock solution composition. It is preferably 1.5% by mass or more, and most preferably 2.0% by mass or more. If the content does not reach the above lower limit, there is a possibility that sufficient effects cannot be obtained in terms of emulsion stability and corrosion resistance. In addition, the content is 7.0% by mass or less, preferably 6.5% by mass or less, more preferably 6.0% by mass or less, further preferably 5.0% by mass or less, and most preferably 4.5% by mass based on the total amount of the stock solution composition. the following. If the content exceeds the above upper limit, there is a tendency that an effect commensurate with the addition cannot be obtained, and the processability may be hindered.

The water-soluble cutting fluid stock solution composition of the present embodiment contains 0.1% by mass or more and 5.0% by mass or less of water based on the total stock composition composition. Stock composition If it is diluted with water when it is used, a good emulsification stability can be obtained by mixing an appropriate amount of water in the stock solution in advance.

As the water, any of industrial water, tap water, ion-exchanged water, distilled water, water treated with activated carbon or a general household water purifier, and water that absorbs moisture in the atmosphere can be used.

The content of water is 0.1% by mass or more and 5.0% by mass or less based on the total amount of the stock solution composition. The lower limit of the water content is, in terms of emulsion stability, 0.1% by mass or more, preferably 0.5% by mass or more, and most preferably 1.0% by mass or more. The upper limit of the content is also 5.0% by mass or less in terms of emulsion stability, more preferably 4.0% by mass or less, and most preferably 3.0% by mass or less.

The preparation method of water is not particularly limited. For example, (1) a method in which the same additives are added to the original liquid and dissolved; (2) a surfactant and water are mixed in advance, and the mixed liquid is prepared in The method in the base oil; (3) The method of forcibly preparing and dispersing the water by using a homogenizer and other stirring devices; (4) The method of forcibly preparing and dispersing the water by blowing steam into the base oil; and (5 ) Methods of naturally absorbing moisture in the atmosphere, etc.

The water-soluble cutting oil stock solution composition of the present embodiment contains 70% by mass or more and 98% by mass or less of mineral oil based on the total stock composition composition. This mineral oil is used as a base oil.

Examples of the mineral oil include mineral oil used as a base material such as lamp oil, diesel oil, spindle oil, motor oil, turbine oil, cylinder oil, and liquid paraffin oil. More specifically, for the lubricating oil retention components obtained by atmospheric distillation and vacuum distillation of paraffin-based crude oil, intermediate-based crude oil, or naphthenic crude oil, desolvation, solvent extraction, hydrocracking, and solvent One or more types of refining methods in dewaxing, contact dewaxing, hydrogenation refining, sulfuric acid cleaning, and clay treatment are appropriately combined and applied, and the obtained paraffinic or naphthenic mineral oil.

The content of mineral oil is 70% by mass or more based on the total amount of the original liquid composition, preferably It is more than 75% by mass, and the best is more than 80% by mass.

On the other hand, the content of the mineral oil is 98% by mass or less, preferably 93% by mass or less, and most preferably 90% by mass or less based on the total amount of the water-soluble cutting oil stock solution composition.

If the content of the mineral oil is within the above range, excellent emulsion stability can be obtained.

The viscosity of mineral oil is not particularly limited. The dynamic viscosity at 40 ° C is preferably 2 mm ² / sec or more, more preferably 5 mm ² / sec, and most preferably 10 mm ² / sec or more. If the viscosity does not reach the above-mentioned lower limit, there is a risk that the processability will be reduced.

On the other hand, the viscosity of the mineral oil is preferably 150 mm ² / sec or less, more preferably 100 mm ² / sec or less, and most preferably 80 mm ² / sec or less. If the viscosity exceeds the above upper limit, the emulsion stability may be impaired.

The composition of the mineral oil is not particularly limited, and the composition of the base oil, which accounts for the majority of the composition, greatly affects the workability and emulsification stability of the cutting oil. In this sense, the aromatic component of the mineral oil used as the base oil is more preferably 10% by mass or more, further preferably 15% by mass or more, and most preferably 20% by mass or more. The aromatic component of mineral oil is usually 40% by mass or less. In the present invention, the "aromatic component" means a value measured by applying the fluorescent indicator adsorption method of JIS K 2536 "Petroleum Products-Hydrocarbon Type Test Method".

In addition, the water-soluble cutting oil stock solution composition of this embodiment may contain only mineral oil as the base oil, and as long as the content of the mineral oil is 70% by mass or more based on the total stock solution composition, it may be Mixed base oil containing mineral oil and synthetic oil.

The water-soluble cutting fluid stock solution composition of the present embodiment may include at least one amine compound selected from the group consisting of aromatic tertiary amines and heterocyclic tertiary amines, water, and mineral oil. The water-soluble cutting oil agent is usually added with well-known additives.

For example, if the water-soluble cutting oil stock solution composition of the present embodiment contains a water-soluble metal corrosion inhibitor, it is effective in enhancing the corrosion prevention effect of the oil composition. Examples of the water-soluble metal corrosion inhibitor include sodium salts and potassium salts of inorganic acids such as boric acid, tungstic acid, molybdic acid, phosphoric acid, carbonic acid, sulfuric acid, silicic acid, nitric acid, and nitrous acid; benzotriazole and methylbenzene Triazoles, tolytriazoles, hydrocarbyl triazoles and other triazoles and their salts; mercaptobenzothiazoles and other thiazoles and their salts; fatty acid alkanolamides; imidazolines; Oxazolines, etc.

In the case where the water-soluble cutting fluid stock solution composition of the present embodiment contains the above additives, the content (in the case of containing two or more additives is the sum of these contents) is generally 20 based on the total stock composition Select within the range of mass% or less.

[Second embodiment: water-soluble cutting oil composition]

The water-soluble cutting oil composition of the second embodiment of the present invention is based on the total amount of the stock solution composition and contains 0.3 mass% or more and 7.0 mass% or less selected from aromatic tertiary amines and heterocyclic tris At least one amine compound of grade amines, 0.1% by mass or more and 5.0% by mass or less of water, and 70% by mass or more and 98% by mass or less of mineral oil water-soluble cutting oil stock solution composition diluted by water to 5 More than 50 times and less than 50 times. In addition, the water-soluble cutting oil stock solution composition of the present embodiment is the same as the water-soluble cutting oil stock solution composition of the first embodiment described above, and repeated description is omitted here.

As the water used for the dilution of the water-soluble cutting fluid stock solution composition, industrial water, tap water, ion-exchanged water, distilled water, water treated with activated carbon or a general household water purifier, and water absorbed in the atmosphere can be used Anyone like water. The type of water used for dilution of the water-soluble cutting fluid stock solution composition may be the same as or different from the type of water contained in the water-soluble cutting fluid stock solution composition.

From the viewpoint of cooling performance, the dilution ratio is 5 times or more, preferably 7 times or more, and more preferably 10 times or more in terms of the volume ratio relative to the water-soluble cutting oil stock solution composition. Further, from the viewpoint of workability, the dilution ratio is 50 times or less, preferably 40 times or less, and more preferably 30 times or less in terms of the volume ratio relative to the water-soluble cutting oil stock solution composition. If If the dilution ratio is less than 5 times, the viscosity of the oil will increase significantly, the inverse of the emulsion will be equal, and the processability and stability of the emulsion will be abnormal. Moreover, if it exceeds 50 times, the concentration of various active ingredients may become insufficient, and sufficient processability may not be obtained.

[Third Embodiment: Cutting Method]

The cutting method of the third embodiment of the present invention includes the steps of using aromatic tertiary amines and heterocyclic tris containing 0.3% by mass or more and 7.0% by mass or less based on the total amount of the stock solution composition. At least one amine compound of grade amines, 0.1% by mass or more and 5.0% by mass or less of water, and 70% by mass or more and 98% by mass or less of mineral oil water-soluble cutting oil stock solution composition diluted by water to 5 The water-soluble cutting oil composition, which is more than 50 times and less than 50 times, cuts the material to be cut containing at least one metal selected from aluminum and its alloys, copper and its alloys, and steel. Furthermore, the water-soluble cutting oil stock solution composition and water-soluble cutting oil composition of the present embodiment are respectively combined with the water-soluble cutting oil crude oil composition of the first embodiment described above and the water-soluble cutting oil of the second embodiment described above. The agent composition is the same, and repeated description is omitted here.

The cutting method of the present embodiment uses the above-mentioned water-soluble cutting oil composition excellent in emulsification stability, corrosion resistance, and workability, and therefore contains at least one selected from aluminum and its alloys, copper and its alloys, and steel. One kind of metal cutting method is useful.

Examples

Hereinafter, the present invention will be described more specifically based on examples and comparative examples, but the present invention is not limited to the following examples.

[Examples 1 to 27, Comparative Examples 1 to 10]

Regarding Examples 1 to 27 and Comparative Examples 1 to 10, the following amine compounds A1 to A10, mineral oils B1 to B8, other additives C1 to C5, and water (US hardness 64) were used to prepare Table 1 4. A water-soluble cutting oil stock solution composition with the composition shown in 4.

<Amine compound>

A1: Tris (methylphenyl) amine

A2: N, N'-dimethyl-4-aminopyridine

A3: 1-benzyl-2-benzimidazole

A4: pyrazole

A5: Two Porphyrin

A6: 4- (2-hydroxyethyl) Porphyrin

A7: N-ethyl Porphyrin

A8: N, N'-dimethylpiper

A9: N- (2-hydroxyethyl) piperidine

A10: Triethanolamine

<Mineral oil>

B1: Mineral oil (dynamic viscosity at 40 ° C 24mm ² / sec, aromatic component 12% by mass)

B2: Mineral oil (dynamic viscosity at 40 ° C 22mm ² / sec, aromatic component 22% by mass)

B3: Mineral oil (dynamic viscosity at 40 ° C 93mm ² / sec, aromatic component 14% by mass)

B4: Mineral oil (dynamic viscosity at 40 ° C 3.4mm ² / sec, aromatic component 12% by mass)

B5: Mineral oil (dynamic viscosity at 40 ° C 144mm ² / sec, aromatic component 14% by mass)

B6: Mineral oil (kinematic viscosity at 40 ° C 27mm ² / sec, aromatic component 6.7% by mass)

B7: Mineral oil (dynamic viscosity at 40 ° C 1.2 mm ² / sec, aromatic component 13% by mass)

B8: Mineral oil (dynamic viscosity at 40 ° C 162mm ² / sec, aromatic component 14% by mass)

<Other additives>

C1: sodium sulfonate

C2: potassium oleate

C3: polyethylene glycol (average degree of polymerization 12)

C4: Polyethylene glycol (average degree of polymerization 4.5) oleic acid monoester

C5: Silicone oil

Next, use the water-soluble cutting fluid stock solutions of Examples 1 to 27 and Comparative Examples 1 to 10. The composition was diluted with water, and the following evaluation test was performed. In addition, the dilution ratio is set to 5 times (20%) in Examples 1 to 26 and Comparative Examples 1 to 10, and 50 times (2%) in Example 27 (both are volume ratios, the values in parentheses It means the content of the stock solution composition based on the total amount of the cutting oil composition).

<Evaluation of emulsion stability>

The evaluation was performed in accordance with the JIS K2241 emulsion stability test. Among them, tap water (US hardness 64) is used for the dilution water system. In addition, the dilution ratio was set to 10 times (the concentration of the original solution was 10%), and the total of the oil layer and the cream layer 24 hours after emulsification was evaluated. Furthermore, in Example 27, the dilution ratio was set to 50 times (2%) (volume ratio, the value in parentheses means the content of the stock solution composition based on the total amount of cutting oil composition), in the same manner Make an evaluation. The evaluation criteria for this test are as follows. The obtained results are shown in Tables 1-4.

A: The total of oil layer and cream layer is less than 1mL

B: The total of the oil layer and the cream layer is more than 1mL and less than 2mL

C: The total of the oil layer and the cream layer is more than 2mL and less than 3mL

D: The total of the oil layer and the cream layer is more than 3mL and less than 4mL

E: The total of the oil layer and the cream layer is 4mL or more and less than 5mL

F: The total of oil layer and cream layer is more than 5mL

<Evaluation of corruption resistance>

The stock solution composition was diluted 20 times using tap water (US hardness 64) to prepare an oil composition. Next, 15 g of inoculum (an oil agent spoiled by use by a customer, total bacterial count of 10 ⁷ or more) was added to 300 mL of the oil composition, and the mixture was stirred at 60 rpm at 30 ° C. After 7 days, the total bacterial count of the oil was determined using Sanai BIO CHECKER TTC of Sanai Petroleum Co., Ltd. The same test was performed on the UNISOLUBLE EM-L (20-fold dilution) of JX Nippon Oil & Energy Co., Ltd. as the base oil, and the total bacterial count was compared. Furthermore, in Example 27, the stock solution composition was made to be diluted 50 times (2%) (volume ratio, the value in parentheses means the content of the stock solution composition based on the total amount of cutting oil composition) The oil composition was evaluated in the same manner. The evaluation criteria for this test are as follows. The obtained results are shown in Tables 1-4.

A: The total bacterial count is less than the reference oil

B: The total bacterial count is equal to the reference oil

C: The total bacterial count is more than the reference oil

<Evaluation of workability>

The tapping energy efficiency (TEE) was obtained by using the tapping evaluation test of the converted screw tap to evaluate.

Using aluminum (AC8A) as the material.

The tool system uses B-NRT B M8 (pitch 1.25) manufactured by OSG, and the processing evaluation is performed on a hole under 7.4 mm at 360 revolutions / minute and a conveying speed of 9 m / min.

In addition, the base oil was set to UNISOLUBLE EM-L of JX Nippon Oil & Energy Co., Ltd., and the base oil and the evaluation oil were both diluted 20 times with tap water.

The so-called tapping energy efficiency is the value obtained by dividing the tapping energy of the reference oil (torque integral value during processing) by the tapping energy of the evaluation oil, according to the following formula: (tapping energy efficiency,%) = (reference Oil tapping energy / Test oil tapping energy) × 100

definition. The oil composition with a tapping energy efficiency exceeding 100 has better processability than the base oil. The evaluation criteria for this test are as follows. The obtained results are shown in Tables 1-4.

A: Tapping energy efficiency is above 110

B: The tapping energy efficiency is less than 110 and above 105

C: The tapping energy efficiency is less than 105 and above 95

D: The tapping energy efficiency is less than 95

[Industry availability]

The water-soluble cutting fluid stock solution composition, cutting fluid composition and cutting processing method are emulsified and stable in the cutting processing of at least one metal selected from aluminum and its alloys, copper and its alloys, and steel It is very useful in terms of degree, corrosion resistance and workability.

Claims (4)

A water-soluble cutting fluid stock solution composition containing at least 1 selected from the group consisting of aromatic tertiary amines and heterocyclic tertiary amines based on the total stock solution composition as a reference, at least 0.3% by mass and 7.0% by mass or less Amine compounds, water with 0.1% by mass or more and 5.0% by mass or less, and mineral oil with 80% by mass or more and 98% by mass or less, and the aromatic component in the mineral oil is 10% by mass or more, and the mineral oil is less than 40 The dynamic viscosity at ℃ is 5 mm ² / sec or more and 150 mm ² / sec or less. The water-soluble cutting oil stock solution composition according to claim 1, wherein the above-mentioned heterocyclic tertiary amines are two

Porphyrin or N-ethyl

Porphyrin. A water-soluble cutting oil composition, which is obtained by diluting the water-soluble cutting oil agent stock solution composition according to claim 1 or 2 with water to 5 times or more and 50 times or less (volume ratio). A cutting method using a water-soluble cutting oil composition according to claim 3 to cut a material to be cut including at least one metal selected from aluminum and its alloys, copper and its alloys, and steel.