TWI687513B - Cutting and/or grinding oil composition - Google Patents

Abstract

The cutting and/or grinding oil composition of the present invention contains: (A) lubricating base oil 60 to 97% by mass, (B) elemental sulfur 0.1 to 0.7% by mass, (C) vulcanization based on the total composition 0.05 to 20% by mass of oils and fats and (D) 0.1 to 7% by mass of polysulfide compounds.

Description

Cutting and/or grinding oil composition Field of invention

The present invention relates to a cutting and/or grinding processing oil composition and a cutting and/or grinding processing method using the cutting and/or grinding processing oil composition.

Background of the invention

In order to efficiently perform more grinding, etc. to improve productivity, the cutting or grinding oil system pays attention to improving cutting and grinding performance. In recent years, the production of special stainless steel with high corrosion resistance has greatly increased, but these are hard and difficult to grind, so it is necessary to improve the cutting or grinding performance. In addition, the grinding process of stainless steel and the like is generally carried out with a grinding belt followed by abrasive grains. Once the abrasive grains of the grinding belt are worn, the amount of grinding will be reduced and they will be replaced at this time. Therefore, the cutting or grinding processing oil also pays attention to making the cutting or grinding tools such as belts less susceptible to wear, so as to extend the life of the tool.

In the past, in order to extend the life of the grinding belt and increase the grinding performance, the grinding oil is often widely mixed with elemental sulfur. The solubility of elemental sulfur in lubricating oil is very low, so it can only be blended in small amounts, but only elemental sulfur cannot fully improve the processing performance such as grinding performance. Especially in the low temperature environment in winter, there is the problem of sulfur precipitation, deposition, and reduced sulfur content, which reduces the processing performance.

Therefore, in the past, in order to improve the processing performance, the known system used elemental sulfur together with other additives. For example, Patent Literatures 1 and 2 disclose a grinding oil composition in which elemental sulfur is added and ultrafine sodium carbonate or metal borate hydrate is blended. Also, for example, Patent Document 3 discloses a grinding oil composition in which a surfactant is blended with elemental sulfur to increase the blending amount of elemental sulfur. As for the ultrafine sodium carbonate described in Patent Document 1, it is usually sold as overbased sodium sulfonate by mixing with sodium sulfonate or other high concentration.

In addition, in order to improve the cutting or grinding performance, it is also known that the cutting or grinding processing oil is blended with active organic sulfur compounds. Active organic sulfur compounds are generally sulfide compounds prepared by reacting with unsaturated hydrocarbons and a mixture of sulfur and hydrogen sulfide at a pressure above atmospheric pressure in the presence of a catalyst. The vulcanized compound prepared in this way is oil-soluble, so it can be blended in a large amount in the base oil.

Prior technical literature Patent Literature

Patent Document 1: Japanese Patent Laid-Open No. 5-132687 Gazette

Patent Document 2: Japanese Patent Laid-Open No. 5-132686 Gazette

Patent Document 3: Japanese Patent Laid-Open No. 4-335095

Summary of the invention

However, a lot of heat is generated during cutting or grinding, so the cutting or grinding oil will be exposed to high temperature and become mist or smoke. At that time, once the sulfur odor is enhanced, the operating environment will significantly deteriorate, so Try not to produce odors from sulfur. In addition, in production sites such as cutting or grinding lines, water may be mixed due to various factors. When water is mixed in, the processing oil may be emulsified or gelatinized, so a cutting or grinding processing oil that is difficult to mix with oil, has excellent water separation, and can be drained is needed.

That is, in addition to cutting or grinding performance and tool life, the cutting or grinding oil also pays attention to low odor and water separability.

However, the processing oils described in Patent Documents 1 to 3 are likely to cause emulsification or gelation when mixed with water due to the mixing of metal salts such as basic sodium sulfonate or surfactants or surfactants, and it is difficult to ensure water separability.

On the other hand, because the processing oil blended with active organic sulfur compounds is blended with a large amount of active organic sulfur compounds, it will not deteriorate the water separability but is also beneficial to cutting or grinding performance and tool life, but a large amount Blending is prone to odor problems.

The present invention was carried out in view of the above problems, and the object of the present invention is to provide a tool capable of dissolving the blended components in the base oil and cutting or grinding performance, tool life such as grinding belt, low odor and water A cutting and/or grinding processing oil composition with good separability and a cutting and/or grinding processing method using the cutting and/or grinding processing oil composition.

As a result of intensive research, the present inventors found that blending a small amount of elemental sulfur and a predetermined amount of sulfurized fats and polysulfide compounds in the lubricating base oil can solve the above-mentioned problems, and then complete the following invention. The present invention provides the following cutting and/or grinding oil composition.

A cutting and/or grinding oil composition, based on the total composition Total content: (A) lubricating base oil 60~97% by mass, (B) elemental sulfur 0.1~0.7% by mass, (C) vulcanized fat 0.05~20% by mass, and (D) polysulfide compound 0.1~7% by mass .

In addition, the present invention also provides the following cutting and/or grinding processing methods and methods of manufacturing cutting and/or grinding processing oil compositions.

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

A method for manufacturing a cutting and/or grinding oil composition, based on the total amount of the composition, blended with (A) lubricating base oil 60 to 97% by mass (B) elemental sulfur 0.1 to 0.7% by mass , (C) 0.05 to 20% by mass of sulfurized oil and fat and (D) 0.1 to 7% by mass of polysulfide compound to obtain a cutting and/or grinding oil composition.

According to the present invention, a cutting and/or grinding processing oil composition capable of dissolving the blended components in the base oil moderately and having good cutting or grinding performance, tool life, low odor, and water separation can be provided And a method of cutting and/or grinding using the cutting and/or grinding oil composition.

1‧‧‧ idle roller

2‧‧‧contact roller

3‧‧‧Grinding belt

4‧‧‧Transport belt

5‧‧‧cut material

6‧‧‧ Grinding oil

7‧‧‧Oil tank

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

Forms for carrying out the invention

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

[Cutting and/or grinding oil composition]

The cutting and/or grinding oil composition according to an embodiment of the present invention contains: (A) lubricating base oil 60 to 97% by mass, (B) elemental sulfur 0.1 to 0.7% by mass, based on the total composition (C) 0.05-20% by mass of vulcanized fats and oils and (D) 0.1-7% by mass of polysulfide compounds.

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

As for the "cutting and/or grinding processing oil composition" in this specification, it means a processing oil composition that can be used as a cutting processing oil or a grinding processing oil.

According to the cutting and/or grinding processing oil composition according to the present embodiment, by using a small amount of elemental sulfur and a predetermined amount of sulfurized grease and polysulfide compound, neither sulfur is precipitated at low temperature nor under high temperature shrimp The working environment is deteriorated due to odor, and the water separation, cutting and grinding performance can be improved, and the life of tools such as grinding belts can be extended.

Hereinafter, each component used in the cutting and/or grinding processing oil composition (hereinafter also referred to as "processing oil composition") will be described in further detail.

((A) Lubricating base oil)

In the cutting and/or grinding processing oil composition of the present embodiment, (A) the lubricating base oil is not particularly limited, and those who can be used for cutting or grinding processing oil can be appropriately selected and used, specifically, mineral oil, Synthetic oil.

Examples of mineral oils include: paraffin hydrocarbon-based crude oil, intermediate-based crude oil or naphthenic crude oil under atmospheric distillation, or fractionated oil obtained by performing vacuum distillation of the remaining residue of atmospheric distillation, or it may be Refined oils obtained by refining according to common methods such as solvent-refined oils, hydrogenated-refined oils, and dewaxing treatments Oil, clay treatment oil, etc.

Synthetic oils include polybutene, polypropylene, α-olefin oligomers having 8 to 14 carbon atoms, and hydrides of these, and polyhydric alcohol esters (trimethylolpropane fatty acid ester, neopentyl alcohol) Alcohol fatty acid esters, etc.) or ester compounds such as dibasic acid esters, aromatic polycarboxylic acid esters, phosphates; alkyl aromatic compounds such as alkylbenzene, alkylnaphthalene; polyglycols such as polyalkylene glycol Oil, silicone oil, etc. Among these, alkylbenzene is preferred.

One type of these base oils may be used, or two or more types may be used in appropriate combination. In addition, from the viewpoint of sufficiently dissolving the components (B), (C), and (D), especially the component (B), in the base oil, mineral oil is suitably used.

Lubricating base oil generally has a dynamic viscosity at 40°C of 1 to 1000 mm ² /s, ideally 2 to 500 mm ² /s.

In addition, in this specification, kinematic viscosity means a person who measured according to JIS K 2283:2000.

The lubricating base oil contains 60 to 97% by mass based on the total amount of the composition in the processing oil composition as described above. By setting the content of the base oil above the lower limit, the elemental sulfur of component (B) can be dissolved. In addition, various properties such as the grindability and machinability of the processing oil composition can be appropriately exerted. In addition, by setting it below the upper limit, it is possible to contain components (B), (C), and (D) in appropriate amounts.

Based on the above point of view, the lubricating base oil should preferably contain 70 to 96% by mass, and more preferably 80 to 95% by mass, based on the total composition of the processing oil composition.

((B) elemental sulfur)

(B) The elemental sulfur of the component can be in the form of lump, powder, molten liquid, etc. In terms of the form, however, from the viewpoint of solubility and disposal, it is suitable to use a powder. Elemental sulfur contains 0.1 to 0.7 mass% of the processing oil composition based on the total composition. If the content is set at more than 0.1% by mass, there can be sufficient grinding and cutting amount, and the grinding performance or cutting performance is good. In addition, by setting it to 0.7% by mass or less, it is possible to prevent the precipitation of elemental sulfur. Based on the above point of view, the content of the elemental sulfur is ideally 0.2 to 0.6 mass%, more preferably 0.3 to 0.5 mass%.

In this embodiment, even if the content of elemental sulfur is only a small amount that can be stably dissolved in the base oil as described above, it can still be produced by blending (C) and (D) to the extent that odor is hardly generated as described later. Ingredients can ensure the solubility and low odor of (B) ingredients, and the cutting and grinding performance, tool life and water separation are in good condition.

((C) Vulcanized grease)

(C) The component vulcanized oil and fat means sulfide of animal and vegetable oils, for example, vulcanized lard, vulcanized rapeseed oil, vulcanized castor oil, vulcanized soybean oil and the like. In addition, the sulfurized fats and oils also include disulfide fatty acids such as sulfurized oleic acid and sulfurized esters such as sulfurized methyl oleate. The sulfur content of vulcanized oils and fats is usually 5 to 25% by mass. In order to extend the life of tools, 8 to 19% by mass should be used.

In addition, although not particularly limited, vulcanized fats and oils generally use those with a dynamic viscosity of 200 to 1500 mm ² /s at 40°C, and those with a dynamic viscosity of 300 to 1100 mm ² /s at 40°C are preferably used. Setting the dynamic viscosity above the above lower limit makes it easier to ensure low odor; while setting it below the above upper limit, it is more beneficial to the solubility of the lubricating base oil.

(C) The component of the vulcanized oil and fat is based on the total amount of the composition in the processing oil composition The standard contains 0.05 to 20% by mass. Setting the above content to 0.05% by mass or more can extend the life of tools such as grinding belts. In addition, by setting it to 20% by mass or less, it is less likely that odor due to vulcanized grease will occur, and the deterioration of the working environment can be prevented. Based on these viewpoints, the content of the vulcanized oil and fat is preferably 0.1 to 18% by mass based on the total composition, and more preferably 0.5 to 16% by mass.

((D) Polysulfide compound)

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

R ¹ -S _x -R ² ... (1)

In the formula, R ¹ and R ² are independently selected from the group consisting of a C 3-20 alkyl group, a C 6-20 aryl group, a C 7-20 alkyl group, and a C 7-20 aralkyl group. Or a hydrocarbon group having 3 to 20 carbon atoms, which may be the same as or different from each other, and x represents an integer of 2 to 10. In addition, the alkyl group and the alkenyl group of R ¹ and R ² may be linear or branched.

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

Specific examples of the dihydrocarbyl polysulfide include dialkyl polysulfide, olefin polysulfide, and benzhydryl polysulfide. Examples of the olefin polysulfide include compounds obtained by reacting an olefin having 3 to 20 carbon atoms or its 2 to 4 polymer with a sulfurizing agent such as sulfur or halogenated sulfur. The olefin is preferably, for example, propylene, isobutylene, diisobutylene, or the like. Examples of the olefin polysulfide include those in which one of R ¹ and R ^{2 in} the general formula (1) is an alkenyl group and the other is an alkenyl group or an alkyl group.

Above, the formula (1), R ¹ and R ² are both alkyl groups preferably dialkyl polysulfide, and the general formula (1), R ¹ and R ² is alkyl having a carbon number of 6 to 18 The base dialkyl polysulfide is preferred.

Specific examples of the dialkyl polysulfide include dihexyl polysulfide, dioctyl polysulfide, dinonyl polysulfide, didecyl polysulfide, behenyl polysulfide, and twenty-one polysulfide. Polysulfide, twenty-four polysulfide, twenty-six polysulfide, and twenty-eight polysulfide. As for the alkyl groups of these compounds, all of them may be linear or branched.

The polysulfide may be used alone or in combination of two or more.

In addition, for polysulfides, those with a sulfur content of 20 to 50% by mass can be generally used, and those with a sulfur content of 25 to 45% by mass are preferably used from the viewpoint of gaining grindability.

In addition, from the viewpoint of further improving the grindability, the polysulfide is diluted to 5 mass% with mineral oil (ISOVG 100) in the copper plate corrosion test (JISK-2513; 100°C, 1 hour). The active type of 3" or "4", that is, active polysulfide is preferred.

(D) The polysulfide compound of the component contains 0.1 to 7 mass% based on the total amount of the composition in the processing oil composition. By setting the above content at 0.1 mass% or more, the cutting or grinding performance can be improved, and the grinding amount can be increased. Also, if it is set at 7 mass% or less, the odor due to the polysulfide compound will be weakened, and the deterioration of the working environment can be prevented. Based on the above viewpoint, the content of the polysulfide compound is preferably 0.5 to 6% by mass based on the total composition, and more preferably 1 to 5% by mass.

As for the processing oil composition, the total amount of sulfur derived from the components (B), (C), and (D) is not particularly limited on the basis of the total amount of the composition, but is usually 1.0 to 6.0% by mass, and ideally 1.4 ~5.0% by mass. Combine the amount of sulfur Calculated within this range, it is easy to make the cutting or grinding performance, tool life, odor and water separation in good condition.

(Other additives)

The cutting and/or grinding oil composition of the present embodiment may contain additives other than the above-mentioned components (A), (B), (C), and (D) within the range that does not hinder the effects of the present invention, as required. The additives include other extreme pressure agents, oily agents, antiwear agents, antioxidants, rust inhibitors, dispersants, defoamers, antifogging agents, etc. other than the above components (B), (C), (D). Well-known additives. Relative to the total amount of the processing oil composition, the total content of these additives is usually 0.01 to 10% by mass, and preferably falls within the range of 0.1 to 5% by mass.

Here, other extreme pressure agents include, for example, chlorinated paraffins, chlorinated fats and oils, chlorinated fatty acid esters, chlorinated fatty acid and other chlorine-based extreme pressure agents, and phosphate esters, (di) phosphorothioate esters, phosphate ester amine salts , (Di) phosphorothioate amine salt, phosphite, (di) phosphorothioate and other phosphorus-based extreme pressure agents.

Examples of oily agents include maleic acid, alkyl or alkenyl maleic acid, oxalic acid, succinic acid, alkyl or alkenyl succinic acid, etc., represented by dibasic acids and their esters, tribasic acids and their esters, rapeseed Fatty acids, fatty acid esters, oils and fats such as oil and soybean refined oil.

Examples of the antiwear agent include zinc dithiophosphate (ZnDTP), zinc dithiocarbamate (ZnDTC), molybdenum oxysulfide dithiophosphate (MoDTP), and molybdenum oxysulfide dithiocarbamate (MoDTC).

As the antioxidant, amines such as diphenylamine, alkyldiphenylamine, phenyl-α-naphthylamine, alkylphenyl-α-naphthylamine, and 4,4′-methylene-bis-2,6-diamine can be used. -Phenols such as tertiary butylphenol, 2,6-di-tertiary butyl p-cresol (DBPC), or sulfur system.

Examples of rust inhibitors include sorbitol esters. In addition, as the dispersant, for example, ashless or metal-based dispersants such as alkyl or alkenyl succinimide, alkyl succinate or alkenyl succinate, and amide may be used.

Examples of defoaming agents include dimethyl polysiloxane and fluoroether.

As the anti-fogging agent, hydrocarbon polymer compounds such as polyisobutylene and ethylene-propylene copolymer can be used, and polyisobutylene is preferably used. The number average molecular weight of the polymer compound is preferably 100,000-3,000,000, preferably 200,000-2,000,000.

The kinematic viscosity of the cutting and/or grinding oil composition according to the present embodiment is not particularly limited, and it is preferably dropped within a range of 5 to 2000 mm ² /s at 40°C. If the dynamic viscosity is within the above range, the processability is good and safety can be ensured from the ignitability and other aspects, which is quite suitable. Based on this, the above dynamic viscosity is preferably from 10 to 1000 mm ² /s.

The cutting and/or grinding oil composition of this embodiment can be obtained by blending (B) component, (C) component and (D) component in (A) lubricating base oil, the blending order or temperature The blending conditions are not particularly limited, and blending can be appropriately selected.

The cutting and/or grinding oil composition of this embodiment is used for metal cutting or grinding, and is suitable for metal grinding. The metal that can be the material to be processed is not particularly limited, and it is preferably stainless steel, alloy steel, carbon steel, aluminum alloy, etc., and a better effect can be obtained for stainless steel.

[Metal cutting and/or grinding method]

The cutting and/or grinding processing method of this embodiment is a method of cutting or grinding metal using the above-mentioned cutting and/or grinding processing oil composition, and it is preferably carried out by grinding processing. The grinding process is performed with a grinding belt, for example. As for the grinding belt, a grinding tool composed of an endless belt body with abrasive materials (abrasive grains) on the surface of a substrate formed of cloth, paper, plastic, rubber, etc., can be suitably selected and used. Users in processing. The metal that can be processed in this method is as described above.

In addition, the cutting and/or grinding oil composition of the present embodiment is suitable for so-called rough grinding because it has good grindability and can increase the amount of grinding.

The grinding process using the grinding belt is performed, for example, by pressing the material to be processed conveyed by the conveying belt or the like against the surface of the grinding belt that rotates between two or more rollers. At this time, the cutting and/or grinding processing oil composition is supplied to the portion (grinding portion) where the belt body of the workpiece is pressed. The cutting and/or grinding processing oil composition is supplied to the grinding section from an oil tank provided under the conveyor belt, for example, while returning from the grinding tribe to the groove and being supplied to the grinding section while circulating.

[Method for manufacturing cutting and/or grinding oil composition]

The manufacturing method of a cutting and/or grinding oil composition according to an embodiment of the present invention is based on the total amount of the composition, blended with (A) lubricating base oil 60 to 97% by mass (B) elemental sulfur 0.1 ~0.7% by mass, (C) 0.05-20% by mass of vulcanized oils and fats, and (D) 0.1-7% by mass of polysulfide compounds to obtain cutting and/or grinding oil compositions.

In this manufacturing method, (A) lubricating base oil can also be blended with (B) Additives other than ~(D) ingredients. As for the blending amounts and other details of the components (A) to (D) and other additives are the same as the content and other details of the above components, and the properties of the prepared cutting and/or grinding oil composition are also Same as above.

Examples

Next, the present invention will be specifically described by examples, but the present invention is not limited by these examples.

<Test‧Evaluation>

(1) Grinding performance and belt life evaluation

The grinding performance and belt life evaluation were performed using the grinding test device shown in the schematic diagram in FIG. 1. That is, in FIG. 1, the workpiece 5 placed on the conveyor belt 4 is pressed against the grinding belt 3 that rotates between the idler roller 1 and the contact roller 2, and at the same time, it faces the grinding portion from the oil groove 7. Grinding processing oil (processing oil composition) 6 is circulated and supplied for grinding. For each test, 5 sheets of material to be cut were used, and the plates were continuously passed without intervals. The evaluation items and test conditions are as follows.

(evaluation items)

The aforementioned test was performed in total 200 passes, and the weight change of the board was measured every 20 passes, and the average grinding amount of the initial 20 passes and the average grinding amount of 181 to 200 passes were evaluated as described below. As for the average grinding amount of 1-20 passes, it is used to evaluate the initial grinding performance of the processing oil composition. In addition, the average grinding amount of 181-200 passes is an indicator that shows how much the belt's grinding ability is maintained after the belt is used up, and it is an indicator for evaluating the life of the belt.

‧Average grinding amount of 1-20 passes

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

the following

‧181-200 pass average grinding amount

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

(Test conditions)

‧Grinding belt: alumina particle size 80

‧Grind material: SUS304, width 90mm×length 1,000mm×thickness about 3mm, 5 pieces per test plate

‧Speed: belt speed: 1400m/min, board feeding speed: 10m/min

‧Grinding method: Climbing method

‧Oil temperature: 40℃

‧Load: 1.5hp/inch (to make the belt pressure resistance constant for evaluation)

(2) Odor assessment

Each processing oil composition was dripped on a 100 degreeC hot stirrer, and its odor was evaluated according to the following evaluation criteria.

A: A little smell, C: Strong smell

(3) Water separation

Measure 20g of each processing oil composition and 20g of water in a 50ml cylinder, shake vigorously for 30 seconds and observe the state after 3 hours, and then evaluate according to the following evaluation criteria.

A: No emulsified phase, C: With emulsified phase

(4) Dissolution stability

Each processing oil composition was put in a 100 ml bottle, and it was allowed to stand in a low-temperature bath at -5°C for 240 hours, and its state was observed and evaluated according to the following evaluation criteria.

A: No precipitates, C: There are precipitates

Examples 1 to 6 and Comparative Examples 1 to 8

The blending materials and ratios shown in Table 1 and Table 2 were used to prepare the processing oil composition, and various properties (grinding performance, belt life, odor, water separation, and dissolution stability) were evaluated as described above. The results are shown in Table 1 and Table 2.

Table 2

The blending materials in Tables 1 and 2 are as follows.

<blending material>

(1) Lubricating base oil

‧Mineral oil: alkane base oil (40°C dynamic viscosity: 8.5mm ² /s, 100°C dynamic viscosity: 2.3mm ² /s)

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

(3) Vulcanized grease

‧Vulcanized grease 1: 40℃ dynamic viscosity: 900mm ² /s, sulfur content: 11% by mass

‧Vulcanized grease 2: 40°C dynamic viscosity: 500mm ² /s, sulfur content: 15% by mass

(4) Polysulfide compounds

‧Polysulfide 1: Dioctyl polysulfide (40°C dynamic viscosity: 45mm ² /s, sulfur content: 40% by mass, copper plate corrosion test (according to JIS K2513 standard): 4B)

‧Polysulfide 2: 22-based polysulfide (40°C dynamic viscosity: 60mm ² /s, sulfur content: 30% by mass, copper plate corrosion test (according to JIS K2513 standard): 4B)

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

(6) Antioxidant: 4,4’-methylene-bis-2,6-di-tertiary butylphenol (DBPC)

From the above results, it can be seen that the processing oil compositions of the examples all have good performances in terms of grinding performance, belt life, low odor, water separation and solubility. In contrast, Comparative Examples 1 to 8 in which at least any one of elemental sulfur, vulcanized grease, and polysulfide compounds are not blended, or any of them are not blended in the amount within the specified range One of the properties of body life, low odor, water separation and solubility is very poor.

Industrial availability

According to the present invention, a cutting and/or grinding oil composition with good cutting or grinding performance, tool life, low odor, water separation, and solubility can be obtained. Therefore, the cutting and/or grinding process of the present invention The oil composition is very suitable for cutting or grinding, especially for grinding using a grinding belt.

Claims (13)

A cutting or grinding oil composition, based on the total composition, contains: (A) lubricating base oil 60 to 97% by mass, (B) elemental sulfur 0.1 to 0.7% by mass, (C) vulcanized grease 0.05 to 20% by mass and (D) 0.1 to 7% by mass of polysulfide compound; the aforementioned base oil is mineral oil and the dynamic viscosity at 40°C is 1 to 1000 mm ² /s, and the dynamic viscosity of the aforementioned sulfurized grease at 40°C is 200~1500mm ² /s; and, for the polysulfide compound, a compound represented by the following general formula (1) is used: R ¹ -S _x -R ² ... (1) In the formula, R ¹ and R ² are respectively Independently selected from the group consisting of 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 aralkyl group having 7 to 20 carbon atoms or an alkenyl group having 3 to 20 carbon atoms These hydrocarbon groups may be the same or different from each other, and x represents an integer of 2 to 10; in addition, the alkyl and alkenyl groups of R ¹ and R ² may be linear or branched. The cutting or grinding oil composition according to claim 1, wherein the total amount of sulfur derived from (B) elemental sulfur, (C) sulfurized grease and (D) polysulfide compound is 1.0 based on the total amount of the composition ~6.0% by mass. The cutting or grinding oil composition according to claim 1, wherein the total amount of sulfur derived from (B) elemental sulfur, (C) sulfurized grease and (D) polysulfide compound is 1.4 based on the total composition ~5.0% by mass. If the cutting or grinding oil composition of claim 1 is included in the composition, In terms of quantity, it contains 88.5~97% by mass of mineral oil. If the cutting or grinding oil composition of claim 1 is contained on the basis of the total amount of the composition, it contains: (A) 80 to 95% by mass of lubricating base oil, (B) 0.3 to 0.5% by mass of elemental sulfur, (C ) 0.5 to 16% by mass of vulcanized fats and oils and (D) 1 to 5% by mass of polysulfide compounds. If the cutting or grinding oil composition of claim 1 is used for the processing of stainless steel. The cutting or grinding processing oil composition according to any one of claims 1 to 6, which is a grinding processing oil used for grinding processing of metals. A cutting or grinding processing method which uses a cutting or grinding processing oil composition as claimed in any one of claims 1 to 7 to cut or grind a metal. If the cutting or grinding processing method of claim 8, it uses a grinding belt to grind the metal. A method for manufacturing a cutting or grinding oil composition, based on the total amount of the composition, blended with (A) lubricating base oil 60-97 mass% (B) elemental sulfur 0.1-0.7 mass%, ( C) 0.05-20% by mass of vulcanized grease and (D) 0.1-7% by mass of polysulfide compound to obtain a cutting or grinding oil composition; the aforementioned base oil is mineral oil and the dynamic viscosity at 40°C is 1~ 1000 mm ² /s, the dynamic viscosity of the vulcanized grease at 40° C. is 200 to 1500 mm ² /s; and, for the polysulfide compound, a compound represented by the following general formula (1) is used: R ¹ -S _x -R ^{2 In the} formula (1), R ¹ and R ² are independently selected from the group consisting of alkyl groups having 3 to 20 carbon atoms, aryl groups having 6 to 20 carbon atoms, alkaryl groups having 7 to 20 carbon atoms, and carbon number Aralkyl groups of 7-20 or alkenyl groups of 3-20 carbon atoms, which may be the same as or different from each other, x represents an integer of 2-10; in addition, the alkyl and alkenyl groups of R ¹ and R ² Can be linear or branched. The method for manufacturing a cutting or grinding oil composition according to claim 10, wherein the aforementioned cutting or grinding oil composition is derived from (B) elemental sulfur and (C) sulfurized oil based on the total amount of the composition And (D) The total sulfur content of the polysulfide compound is 1.0 to 6.0% by mass. The method for manufacturing a cutting or grinding oil composition according to claim 10, wherein the aforementioned cutting or grinding oil composition is derived from (B) elemental sulfur and (C) sulfurized oil based on the total amount of the composition And (D) The total sulfur content of the polysulfide compound is 1.4 to 5.0% by mass. The method for manufacturing a cutting or grinding oil composition according to claim 10, wherein the cutting or grinding oil composition contains 88.5 to 97% by mass of mineral oil based on the total composition.

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