KR20170132744A - Cutting and grinding oil composition - Google Patents

Abstract

The cutting / grinding oil composition according to the present invention is characterized in that it comprises (A) 60 to 97% by mass of a lubricating base oil, (B) 0.1 to 0.7% by mass of sulfur, (C) 0.05 to 20% ) Polysulfide compound in an amount of 0.1 to 7 mass%.

Description

Cutting and grinding oil composition

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting / grinding oil composition and a cutting / grinding method using the cutting / grinding oil composition.

Cutting or grinding machining oil is required to improve the cutting and grinding performance in order to improve the productivity by efficiently grinding and the like. In recent years, production of special stainless steels with high corrosion resistance has been increasing, but since they are difficult to grind hardly, further improvement in cutting or grinding performance is demanded. The grinding process of stainless steel or the like is generally performed by a grinding belt having abrasive grains adhered thereto. However, when the abrasive grains are worn, the amount of grinding is reduced, and exchange is performed at that point. Therefore, cutting or grinding oil is required to make the cutting or grinding tools such as belts difficult to wear, and to prolong the tool life.

Conventionally, in order to increase grinding performance while lengthening the life of the grinding belt, grinding fluid has been widely used in combination with a group of sulfur. Since group sulfur is low in solubility in lubricating oil, it can not be compounded in only a small amount, and processing performance such as grinding performance can not be sufficiently improved with only group sulfur. Particularly, in a low temperature environment in winter, there is a problem that sulfur is precipitated and deposited, and the amount of dissolved sulfur decreases, resulting in deterioration of processing performance.

Therefore, conventionally, it is known that grouped sulfur is used together with other additives to improve processing performance. For example, Patent Documents 1 and 2 disclose a grinding oil composition in which super-fine particles of sodium carbonate or a metal borate hydrate are blended in addition to a group of sulfur. Further, for example, Patent Document 3 discloses an abrasive oil composition in which a surfactant is blended together with a group of sulfur in order to increase the amount of sulfur to be compounded. On the other hand, the ultra-fine particle sodium carbonate described in Patent Document 1 is usually mixed at a high concentration in sodium sulfonate and the like, and is commercially available as an overbased sodium sulfonate.

It is also known that a cutting or grinding oil generally contains an active organosulfur compound in order to improve cutting or grinding performance. The active organohydrogensulfide compound is generally a sulfurized compound prepared by reacting an unsaturated hydrocarbon compound with a mixture of sulfur and hydrogen sulfide or the like in the presence of a catalyst at a pressure of atmospheric pressure or higher. Since the sulfided compound thus prepared has oil solubility, it can be compounded in a relatively large amount in the base oil.

Japanese Patent Application Laid-Open No. 5-132687 Japanese Patent Application Laid-Open No. 5-132686 Japanese Patent Application Laid-Open No. 4-335095

However, at the time of cutting or grinding, since the heat generation is usually large, the cutting or grinding processing oil is exposed to high temperature and becomes mist or fume. When the sulfur smell is strong at that time, the working environment is markedly deteriorated, so it is required that the smell caused by sulfur is not generated as much as possible. In addition, there are cases where water is mixed in various factors at a production site such as a cutting or grinding processing line. If water is mixed, the oil may be emulsified or geled. Therefore, it is required to have cutting or grinding oil which is difficult to be mixed with oil, is excellent in water separability and can drain out.

That is, cutting or grinding oil is required to have low cutting performance and water resistance in addition to cutting or grinding performance and tool life.

However, in the processing oils described in Patent Documents 1 to 3, since a metal salt such as an overbased sodium sulfonate or a surfactant is blended, emulsification or gelation tends to occur at the time of water incorporation, and it may be difficult to ensure water-solubility .

On the other hand, the processing oil containing the active organosulfur compound can improve the cutting or grinding performance and service life of the processing tool without deteriorating the water-solubility by blending a large amount of the active organosulfur compound. However, So that the problem of odor becomes liable to occur.

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide a process for producing a lubricating oil composition capable of satisfactorily dissolving a blended component in a base oil, A cutting / grinding oil composition, and a cutting / grinding method using the cutting / grinding oil composition.

As a result of intensive studies, the inventors of the present invention have found that the above problems can be solved by combining a small amount of a single sulfur atom with a predetermined amount of sulfurized oil and a polysulfide compound in a lubricating oil base oil. The present invention provides the following cutting / grinding oil composition.

(C) sulfurized oil in an amount of 0.05 to 20 mass% and (D) polysulfide compound in an amount of 0.1 to 7 mass% based on the total amount of the composition, (A) 60 to 97 mass% of a lubricant base oil, ≪ / RTI >

The present invention also provides the following cutting / grinding method and a method for producing a cutting / grinding oil composition.

A cutting / grinding working method for cutting or grinding a metal by using the above-mentioned cutting / grinding oil composition.

(B) 0.1 to 0.7 mass% of (B) sulfur, (C) 0.05 to 20 mass% of sulfurized oil, and (D) 0.1 to 7 mass% of a polysulfide compound, based on the total amount of the composition, To obtain a cutting / grinding oil composition.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide a cutting and grinding oil composition capable of satisfactorily dissolving a blended component in a base oil and having good cutting or grinding performance, a tool life, a low workability and a water solubility, and a cutting and grinding using a cutting and grinding oil composition A processing method can be provided.

1 is a schematic view showing a grinding test apparatus used in Examples and Comparative Examples.

Hereinafter, one embodiment of the present invention will be described in detail.

[Cutting and grinding oil composition]

A cutting and grinding processing oil composition according to one embodiment of the present invention is characterized in that it comprises (A) 60 to 97 mass% of a lubricating base oil, (B) 0.1 to 0.7 mass% of a sulfur group, (C) By mass and (D) 0.1 to 7% by mass of a polysulfide compound.

Further, a cutting and grinding method according to an embodiment of the present invention is a method of cutting or grinding a metal by using the cutting / grinding oil composition.

On the other hand, in the present specification, the "cutting and grinding oil composition" means a machining oil composition used as cutting oil or grinding oil.

According to the cutting / grinding oil composition of the present embodiment, by using a small amount of a single sulfur and a predetermined amount of a sulfurized oil and a polysulfide compound, precipitation of sulfur at a low temperature or aggravation of the working environment at high temperatures It is possible to extend the service life of the grinding belt or the like in addition to improving the water separability, cutting and grinding performance.

Hereinafter, each component used in a cutting / grinding oil composition (hereinafter also referred to as a " processed oil composition ") will be described in more detail.

((A) Lubricating oil base oil)

In the cutting / grinding oil composition of the present embodiment, the lubricant base oil (A) is not particularly limited, but it can be suitably selected from those used for cutting or grinding oil. Specific examples thereof include mineral oil and synthetic oil .

As the mineral oil, for example, a distillation oil obtained by atmospheric distillation of paraffin-derived crude oil, intermediate-machine crude oil or naphthene-derived crude oil, or distillation residue of atmospheric distillation residue, or a distillation oil obtained by purifying it by a conventional method For example, a solvent-refined oil, a hydrogenated refined oil, a dewaxing oil, a clay-treated oil, and the like.

Examples of the synthetic oil include polybutene, polypropylene,? -Olefin oligomers having 8 to 14 carbon atoms and hydrides thereof, further polyol esters (fatty acid esters of trimethylolpropane, fatty acid esters of pentaerythritol, etc.) Ester compounds such as dibasic acid esters, aromatic polycarboxylic acid esters and phosphoric acid esters; alkyl aromatics such as alkylbenzenes and alkylnaphthalenes; polyglycol oils such as polyalkylene glycols; and silicone oils. Of these, Alkylbenzenes are preferred.

These base oils may be used alone or in combination of two or more. In view of being able to sufficiently dissolve the components (B), (C) and (D), particularly the component (B) in the base oil, mineral oil is preferably used.

As the lubricant base oil, a kinematic viscosity at 40 캜 is generally from ¹ to 1000 mm ² / s, preferably from ² to 500 mm ² / s.

In the present specification, the kinematic viscosity is measured in accordance with JIS K 2283: 2000.

As described above, the lubricating base oil is contained in the processed oil composition in an amount of 60 to 97 mass% based on the total amount of the composition. By making the content of the base oil equal to or more than the above lower limit value, it becomes possible to dissolve the group sulfur of the component (B). In addition, it is possible to suitably exhibit various performances such as grinding property and machinability of the processed oil composition. In addition, it is possible to contain an appropriate amount of the components (B), (C) and (D) by setting it to be not more than the upper limit.

In view of the above, the lubricating base oil is contained in the processed oil composition in an amount of preferably 70 to 96 mass%, more preferably 80 to 95 mass%, based on the total amount of the composition.

((B) Sulfur)

As the elemental sulfur of the component (B), any form such as a massive, powdery or molten liquid phase may be used, but a powdery one is preferably used in view of solubility and handling. Grouped sulfur is contained in the processing oil composition in an amount of 0.1 to 0.7% by mass based on the total amount of the composition. When the content is 0.1 mass% or more, the amount of grinding and cutting becomes sufficient, and the grinding performance and cutting performance are improved. When it is 0.7% by mass or less, it is prevented that a single sulfur is precipitated. From the above viewpoint, the content of the group sulfur is preferably 0.2 to 0.6% by mass, and more preferably 0.3 to 0.5% by mass.

In the present embodiment, even if the content of the single sulfur is small enough to stably dissolve in the base oil, the components (C) and (D) are blended to such an extent that odor hardly occurs as described later, It is possible to obtain good cutting and grinding performance, tool life, and water-solubility while securing low-temperature and low-temperature characteristics.

((C) sulfurized oil)

The sulfurized oil of component (C) refers to sulfides of plant and animal oils and includes, for example, sulfurized lard, sulfurized rapeseed oil, sulfurized castor oil, and sulfurized soybean oil. This sulfurized oil also includes sulfurized esters such as disulfurated fatty acids such as sulfuric oleic acid and methyl oleate. The sulfurized oil is usually used in an amount of 5 to 25% by mass and a content of preferably 8 to 19% by mass for a longer tool life.

Further, although not particularly limited, examples of sulfurized oil, generally having a kinematic viscosity at 40 ℃ 200~1500mm ² / s is not used, it is preferably a kinematic viscosity at 40 ℃ the 300~1100mm ² / s is used. When the kinematic viscosity is higher than the lower limit described above, it is easier to ensure low-temperature performance. When the kinematic viscosity is lower than the upper limit, the solubility in the lubricating base oil is improved.

The sulfurized oil of component (C) is contained in the processed oil composition in an amount of 0.05 to 20 mass% based on the total amount of the composition. By setting the content to 0.05 mass% or more, it is possible to extend the service life of a tool such as a grinding belt. Further, when the content is 20 mass% or less, it is difficult to cause odor attributable to sulfurized oil, thereby preventing deterioration of the working environment. From these viewpoints, the content of the sulfurized oil is preferably 0.1 to 18 mass%, more preferably 0.5 to 16 mass%, based on the entire composition.

((D) polysulfide compound)

As the polysulfide compound of component (D), dihydrocarbyl polysulfide is usually used. As the dihydrocarbyl polysulfide, a compound represented by the following formula (1) is used.

R ¹ -S _x -R ² (1)

Wherein R ¹ and R ² are each independently an alkyl group having 3 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, an alkylaryl group having 7 to 20 carbon atoms, an arylalkyl group having 7 to 20 carbon atoms, And alkenyl groups, they may be the same or different and x represents an integer of 2 to 10. The alkyl group and alkenyl group in R ¹ and R ² may be either linear or branched.

In the formula (1), R ¹ and R ² each preferably have 6 to 18 carbon atoms, and x is preferably 2 to 8, more preferably 3 to 7.

Specific examples of the dihydrocarbyl polysulfide include dialkyl polysulfide, olefin polysulfide, and dibenzyl polysulfide. On the other hand, the olefin polysulfide includes those obtained by reacting an olefin having 3 to 20 carbon atoms or a quadruple or tetramer thereof with a sulfurizing agent such as sulfur or halogenated sulfur. As the olefin, for example, propylene, isobutene, diisobutene and the like are preferable. As the olefin polysulfide, one of R ¹ and R ² in the formula (1) is an alkenyl group and the other is an alkenyl group or an alkyl group.

Among them, a dialkyl polysulfide in which all of R ¹ and R ² in the formula (1) are alkyl groups is preferable, and a dialkyl polysulfide in which R ¹ and R ² in the formula (1) are alkyl groups having 6 to 18 carbon atoms More preferable.

Specific examples of dialkyl polysulfides include dihexyl polysulfide, dioctyl polysulfide, dynoyl polysulfide, didecyl polysulfide, dydodecyl polysulfide, dydecyl polysulfide, ditetradecyl polysulfide, dihexadecyl poly Sulfide, and dioctadecyl polysulfide. On the other hand, in these compounds, all the alkyl groups may be linear or branched.

On the other hand, the polysulfide may be used alone or in combination of two or more.

The polysulfide usually has a sulfur content of 20 to 50 mass% and is preferably used in an amount of 25 to 45 mass% from the viewpoint of improving grindability.

From the viewpoint of improving the grindability, the polysulfide was diluted to 5 mass% with mineral oil (ISOVG 100), and the polysulfide was diluted to 3 mass% or less in a copper plate corrosion test (JIS K-2513; 4 ", that is, active polysulfide is more suitable.

The polysulfide compound of component (D) is contained in the processed oil composition in an amount of 0.1 to 7 mass% based on the total amount of the composition. By setting the content to 0.1% by mass or more, cutting or grinding performance can be improved and the amount of grinding can be increased. When the content is 7% by mass or less, odor caused by the polysulfide compound is weakened, and the deterioration of the working environment is prevented. In view of the above, the content of the polysulfide compound is preferably 0.5 to 6% by mass, more preferably 1 to 5% by mass, based on the total amount of the composition.

On the other hand, in the processed oil composition, the total amount of sulfur derived from the components (B), (C) and (D) is not particularly limited, but is generally 1.0 to 6.0 mass%, preferably 1.4 to 5.0 mass% %to be. By setting the total of the sulfur content to such a range, it becomes easy to improve the cutting or grinding performance, the tool life, the wettability and the water-solubility.

(Other additives)

The cutting and grinding processing oil composition of the present embodiment may contain additives other than the above components (A), (B), (C) and (D) insofar as the effect of the present invention is not impaired . Examples of the additives include known additives such as extreme pressure agents, oil agents, wear resistant agents, antioxidants, rust inhibitors, dispersants, antifoaming agents and antistatic agents other than the components (B), (C) . The total content of these additives is preferably in the range of usually 0.01 to 10 mass% and 0.1 to 5 mass% with respect to the total amount of the processing oil composition.

Examples of other extreme pressure agents include chlorine-based extreme pressure agents such as chlorinated paraffin, chlorinated oils, chlorinated fatty acid esters and chlorinated fatty acids, phosphoric acid esters, (di) thiophosphoric acid esters, phosphoric acid ester amine salts, (di) Phosphorus ester amine salt, phosphorous acid ester, and (di) thioacetic acid ester.

Examples of the oily agent include dibasic acids and esters thereof represented by maleic acid, alkyl or alkenyl maleic acid, oxalic acid, succinic acid, alkyl or alkenyl succinic acid, tribasic acid and its ester, rapeseed oil, Fatty acids such as synthetic oil, fatty acid esters, oils and the like.

Examples of the wear resistance agent include zinc dithiophosphate (ZnDTP), zinc dithiocarbamate (ZnDTC), molybdenum oxydithiophosphate molybdenum (MoDTP), oxydisodium dicarboxylic acid molybdenum (MoDTC), etc. .

Examples of the antioxidant include amine-based compounds such as diphenylamine, alkyldiphenylamine, phenyl- alpha -naphthylamine and alkylphenyl- alpha -naphthylamine, 4,4'-methylene-bis- Di-tert-butylphenol, 2,6-di-tert-butyl-p-cresol (DBPC), or the like.

Examples of the antirusting agent include a consumptive ester. As the dispersing agent, for example, a non-cyclic or metal-based dispersing agent such as alkyl or alkenyl succinic acid imide, alkyl or alkenyl succinic acid ester, acid amide and the like is used.

Examples of the antifoaming agent include dimethylpolysiloxane and fluoroether.

As the antistatic agent, a hydrocarbon-based polymer compound such as polyisobutylene or ethylene-propylene copolymer can be used, and polyisobutylene is preferably used. The number average molecular weight of the polymer compound is preferably 100,000 to 3,000,000, more preferably 200,000 to 2,000,000.

The kinematic viscosity of the cutting / grinding oil composition of this embodiment is not particularly limited, but is preferably in the range of ⁵ to 2000 mm ² / s at 40 ° C. When the kinematic viscosity is within the above range, it is preferable because workability is good and safety is secured in terms of flammability and the like. In this respect, the kinematic viscosity is more preferably 10 to 1000 mm ² / s.

The cutting / grinding oil composition of the present embodiment can be obtained by blending the component (B), the component (C) and the component (D) in the lubricating oil base oil (A), but the mixing ratio, There is no limitation, and it can be appropriately selected and mixed.

The cutting / grinding oil composition of the present embodiment is used for cutting or grinding a metal, and is preferably used for grinding a metal. The metal to be the material to be processed is not particularly limited, but stainless steel, alloy steel, carbon steel, aluminum alloy and the like are preferable, and more preferable effect can be obtained for stainless steel.

[Cutting and grinding of metal]

The cutting / grinding method of the present embodiment is a method of cutting or grinding a metal by using the above-mentioned cutting / grinding oil composition, but it is preferable to perform grinding. The grinding process is performed, for example, by a grinding belt. On the other hand, a grinding belt is an abrasive tool comprising an endless belt in which abrasive grains (abrasive grains) are adhered to the surface of a base body made of cloth, paper, plastic, rubber or the like, and can be suitably selected and used normally in grinding. The metal to be the working material in the present method is as described above.

On the other hand, the cutting / grinding oil composition of the present embodiment has good grinding performance and can increase the amount of grinding, so that it can be suitably used for so-called rough grinding.

In the grinding process using the grinding belt, for example, the surface of the grinding belt, which rotates and runs between two or more rollers, is pressed against the material to be processed which is transported by a transport belt or the like. At this time, a cutting / grinding oil composition is supplied to the portion (grinding portion) where the belt of the work material is pressed. The cutting / grinding oil composition is supplied to the grinding portion from an oil tank provided below the transport belt, for example, and is returned to the tank after being dropped from the grinding portion, and is circulated and supplied to the grinding portion.

[Manufacturing method of cutting / grinding oil composition]

A process for producing a cutting and grinding oil composition according to one embodiment of the present invention comprises the steps of (A) mixing 60 to 97% by mass of a lubricant base oil, (B) 0.1 to 0.7% by mass of sulfur, 0.05 to 20 mass% of fat and (D) 0.1 to 7 mass% of polysulfide compound to obtain a cutting / grinding oil composition.

In the present production method, additives other than the components (B) to (D) may also be added to the lubricant base oil (A). On the other hand, the amounts of the components (A) to (D) and other additives and other details are the same as those of the above-mentioned respective components and other details, and the properties of the obtained cutting and grinding oil compositions are as described above.

Example

EXAMPLES The present invention will be described in more detail with reference to the following examples. However, the present invention is by no means limited by these examples.

<Test and evaluation>

(1) Grinding performance, belt life evaluation

The grinding properties and the belt life were evaluated using a grinding test apparatus schematically shown in Fig. 1, the workpiece 5 placed on the conveyor belt 4 is pressed against the grinding belt 3 rotating between the idle roll 1 and the contact roll 2, (Processing oil composition) 6 is circulated and supplied from the oil tank 7 to perform grinding. 1 Use 5 pieces of workpiece material per test, and consecutively run through the workpiece without emptying the gap. Evaluation items and test conditions are as follows.

(Evaluation Items)

The test was carried out in a total of 200 passes, and the plate weight change per 20 passes was measured. The average grinding amount of the initial 20 passes and the average grinding amount from 181 passes to 200 passes were evaluated as follows. On the other hand, the average grinding amount of 1 to 20 passes is a test for evaluating the initial grinding performance of the processed oil composition. The 181-200 pass average grinding amount is an index indicating how much the grinding performance of the belt is maintained when the belt is used, and is an index for evaluating the belt life.

· Average grinding amount of 1 to 20 passes

   A: 7.00 or more, B: 6.99 or less 6.00 or more, C: 5.99 or less

· Average grinding amount between 181 and 200 passes

   A: 4.00 or more, B: 3.99 or less 3.50 or more, C: 3.49 or less

(Exam conditions)

· Grinding belt: Alumina 80

· Material to be ground: SUS304, width 90mm × length 1,000mm × thickness 3mm, 5 pieces per test

· Speed: Belt speed; 1400m / min, plate transfer rate; 10 m / min

· Polishing method: Down cut

· Oil temperature: 40 ℃

· Load: 1.5 hp / inch (Evaluate belt pressure as constant)

(2) Odor assessment

Each of the processed oil compositions was dropped on a hot stirrer at 100 캜, and the odor was evaluated according to the following evaluation criteria.

  A: slight odor, C: strong odor

(3) Water solubility

20 g of each processed oil composition and 20 g of water were taken in a 50 ml cylinder and measured by shaking vigorously for 30 seconds and observed after 3 hours and evaluated according to the following evaluation criteria.

  A: No image, C: Yes image

(4) Dissolution stability

Each processed oil composition was placed in a 100 ml bottle and allowed to stand in a low temperature bath at -5 ° C for 240 hours. The condition was observed and evaluated according to the following evaluation criteria.

  A: no precipitate, C: precipitate

Examples 1 to 9 and Comparative Examples 1 to 8

A processing oil composition was prepared in the formulations and ratios shown in Tables 1 and 2, and various performances (grinding performance, belt life, odor, water solubility, and dissolution stability) were evaluated as described above. The results are shown in Tables 1 and 2.

The compounding materials of Tables 1 and 2 are as follows.

<Ingredients>

(1) Lubricant base oil

· Mineral oil: paraffin base oil (kinematic viscosity at 40 ° C: 8.5 mm ² / s, kinematic viscosity at 100 ° C: 2.3 mm ² / s)

(2) Group sulfur (powder sulfur, sulfur content: 100% by mass)

(3) sulfurized oil

Sulfurized oil 1: 40 占 폚 Kinematic viscosity: 900 mm ² / s, Sulfur content: 11 mass%

Sulfurized oil 2: 40 占 폚 kinematic viscosity: 500 mm ² / s, sulfur content: 15 mass%

(4) Polysulfide compound

Polysulfide 1: dioctyl polysulfide (40 占 폚 kinematic viscosity: 45 mm ² / s, sulfur content: 40 mass%, copper plate corrosion test (according to JIS K2513): 4B)

Polysulfide 2: Dydodecyl polysulfide (40 占 폚 kinematic viscosity: 60 mm ² / s, sulfur content: 30 mass%, copper plate corrosion test (according to JIS K2513): 4B)

(5) Anti-mist agent: polyisobutylene (Mw: 4,400,000, Mn: 320,000)

(6) Antioxidant: 4,4'-methylene-bis-2,6-di-t-butylphenol (DBPC)

From the above results, all of the machining oil compositions of the examples were satisfactory in all of the performances of grinding performance, belt life, low profile, water resistance and solubility. In contrast, Comparative Examples 1 to 8, in which at least one of the group sulfur, the sulfurized oil and the polysulfide compound was not blended, or any one of them was not blended in an amount within the specified range, showed abrasive performance, belt life, , And solubility are inferior.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to obtain a cutting / grinding oil composition having good cutting / grinding performance, tool life, low workability, water solubility and solubility. Therefore, the cutting / grinding oil composition of the present invention can be used for cutting or grinding, It can be suitably used for grinding using a belt.

1: idol roll
2: contact roll
3: Grinding belt
4: conveyor belt
5: Workpiece
6: Grinding oil
7: Oil tank

Claims (9)

(C) sulfurized oil in an amount of 0.05 to 20 mass% and (D) polysulfide compound in an amount of 0.1 to 7 mass% based on the total amount of the composition, (A) 60 to 97 mass% of a lubricant base oil, &Lt; / RTI &gt; The method according to claim 1,
(D) the polysulfide compound is a dihydrocarbyl polysulfide. 3. The method according to claim 1 or 2,
(C) a cutting / grinding oil composition having a kinematic viscosity at 40 DEG C of from 200 to 1500 mm &lt; ^{2 &gt;} / s. 4. The method according to any one of claims 1 to 3,
(A) a lubricant base oil in an amount of 80 to 95 mass%, (B) 0.3 to 0.5 mass% of sulfur, (C) 0.5 to 16 mass% of sulfurized oil, and (D) 1 to 5 mass% of a polysulfide compound, &Lt; / RTI &gt; 5. The method according to any one of claims 1 to 4,
A cutting and grinding processing oil composition used for processing stainless steel. 6. The method according to any one of claims 1 to 5,
A grinding-processing oil composition for grinding used in grinding of metal. A cutting / grinding working method for cutting or grinding a metal by using the cutting / grinding oil composition according to any one of claims 1 to 6. 8. The method of claim 7,
A method of grinding a metal by a grinding belt. (B) 0.1 to 0.7 mass% of (B) sulfur, (C) 0.05 to 20 mass% of sulfurized oil, and (D) 0.1 to 7 mass% of a polysulfide compound, based on the total amount of the composition, To obtain a cutting / grinding oil composition.

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