JP3753728B2 - Method for producing metal product using high-performance water-soluble metalworking fluid and water-soluble metalworking fluid - Google Patents

Description

The present invention relates to a method for producing a metal product by metal working such as plastic working, including cutting and grinding using a water-soluble metalworking fluid, and a water-soluble metalworking fluid , in particular, excellent in lubricating performance. The present invention relates to a method for producing a metal product using a water-soluble metalworking fluid that exhibits an effect , and a water-soluble metalworking fluid .

  Cutting fluids widely used in the cutting and grinding fields include water-insoluble cutting fluids based on mineral oil, water-soluble cutting fluids that are diluted with water and contain mineral oil, surfactant, organic amine, etc. There is. And in these cutting fluids, in order to improve the lubrication performance of the fluid, a compound called an extreme pressure additive may be added and formulated (see, for example, Patent Document 1).

  Representative compounds of this extreme pressure additive include chlorine-containing compounds, sulfur-containing compounds, molybdenum-containing compounds and the like. Since metal processing fluids produce waste oil after use, for example, when the waste oil is burned, it will lead to damage to the incinerator due to generation of chlorine gas, hydrogen chloride gas, sulfur oxide gas, etc. . In some chlorinated additives, generation of dioxins is recognized. On the other hand, since molybdenum compounds are subject to the PRTR law, strict management is required.

  These extreme pressure additives are indispensable compounds for improving the lubrication performance of oils, but from the viewpoint of saving global resources and preventing deterioration of the global environment in recent years, they do not pollute the global environment more than before. There is a demand for the development of an oil agent, and further an oil agent that extends the life of a tool as much as possible.

  In order to solve such problems, the present inventors have already developed a high-performance lubricating oil in which an effective amount of boron nitride fine powder is dispersed in the liquid component (see, for example, Patent Document 2). These lubricants have been confirmed to exhibit excellent performance for cutting, grinding and / or polishing due to the effect of boron nitride contained, but when used as a water-insoluble cutting oil Although it exhibits an excellent effect, water-soluble cutting oil is often used for fire protection in large-scale facilities that are in danger of ignition and require a large amount of oil. On the other hand, boron nitride has many features in terms of cost and work efficiency, such as long-lasting blades and increased cutting speed when used as an extreme pressure agent in cutting fluid, but it dissolves in cutting fluid because it is solid. In addition, since the specific gravity is as large as about 2.27, there is a problem that if it is used by directly dispersing in a cutting fluid, it will settle. Also, water-dispersed plastic working lubricants containing inorganic solid lubricants have been reported (for example, see Patent Document 3), but lubrication during plastic working such as forging, rolling, wire drawing, and extrusion. The size of the oil droplets is limited to oil, and the size of the oil droplets is intended to be a considerably large particle shape of slightly over 50 μm and at least over 5 μm, as estimated from the particle size of the solid lubricant used. On the other hand, in metal processing such as cutting, grinding, and polishing, a finer one is preferable from the viewpoint of performance, and the particle size of water droplets of a water-soluble cutting fluid called a general emulsion type is 2 to 5 μm. In consideration of the use of the filtration device for recirculation, it is desirable to make it 5 μm or less, but this cannot be applied. Accordingly, there is a need for high performance metalworking lubricants that are water soluble and have good boron nitride dispersibility.

JP 11-166190 A Japanese Patent No. 2911113 Japanese Patent Laid-Open No. 10-316989

Therefore, the present invention processes metals using an environment-friendly water-soluble metal processing oil and a water-soluble metal processing oil that do not contain heavy metals such as molybdenum disulfide and do not generate harmful substances such as dioxins during disposal. It aims at providing the manufacturing method of a metal product.

Another object of the present invention is to provide a metal product manufacturing method and a water-soluble metalworking fluid that exhibit excellent processing performance and wear resistance performance of tools. Furthermore, an object of this invention is to provide the manufacturing method of a metal product with little fear of a fire, and a water-soluble metalworking fluid .

  The present invention uses as a starting point a fine powder of boron nitride as an extreme pressure agent contained in a water-soluble metalworking fluid, and in particular, a fine powder of boron nitride having a crystalline turbostratic structure having excellent dispersibility and lubricity. The mixture is refined and emulsified in water to form an oil-in-water emulsion, whereby fine boron nitride powder is separated and isolated at the interface between oil and water to prevent reagglomeration. By confining together with oil in the interface, it was found that sedimentation of boron nitride fine powder can be suppressed by the buoyancy of the oil, and the present invention has been completed.

  That is, in the first aspect, the metal product production method of the present invention contains 0.001 wt% or more and less than 0.1 wt% of boron nitride fine powder having a crystalline disordered layer structure based on the total composition. A metal material is processed using a water-soluble metal processing oil. Further, in the second aspect of the present invention, the water-soluble, characterized in that it contains 0.001% by weight or more and less than 0.1% by weight of boron nitride fine powder having a crystalline disordered layer structure based on the total composition. A metalworking fluid is provided.

  The method for producing a metal product of the present invention exhibits excellent cutting performance and wear resistance performance of the tool due to the solid lubricating action of boron nitride and the cooling action of water. It is also possible to use it in the field of heavy cutting of difficult-to-cut materials such as titanium alloy and Inconel by adjusting the composition of. Furthermore, the metal product manufacturing method of the present invention is preferable in terms of fire countermeasures because the metal working oil used is water-soluble.

  As the lubricating base oil constituting the water-soluble metalworking fluid of the present invention, mineral oil, synthetic oil, animal and vegetable oil, or a mixture thereof can be used. The mineral oil, synthetic oil, and animal and vegetable oils are not particularly limited as long as they are generally used as base oils for metalworking oils. As the mineral oil, for example, a refined mineral oil of ISO VG10 to ISO VG 460 is preferable, which may be either paraffinic or naphthenic. On the other hand, as the synthetic oil, polyol ester, polyglycol, poly α-olefin, α-olefin, normal paraffin, isoparaffin, alkylbenzene, polyether, and the like can be used. As animal and vegetable oils, beef tallow, rapeseed oil, soybean oil, sunflower oil, safflower oil, castor oil, coconut oil, coconut shell oil and the like can be used. These base oils can be used alone or in combination of two or more, and may be used in combination of mineral oil, synthetic oil, and animal and vegetable oils.

  The boron nitride fine powder constituting the water-soluble metalworking fluid of the present invention is chemically stable compared to other solid lubricants such as graphite, and is characterized in that it is not oxidized up to nearly 1000 ° C. in air. Boron nitride (BN) is a compound composed of boron and nitrogen. However, boron nitride has a polymorph having almost the same crystal structure as carbon, and amorphous boron nitride (hereinafter referred to as “a-BN”), Hexagonal boron nitride (hereinafter referred to as “h-BN”) having a structure in which hexagonal network layers are stacked at a two-layer cycle, and rhombohedral crystal having a structure in which hexagonal network layers are stacked at a three-layer cycle. Boron nitride (hereinafter referred to as “r-BN”), boron nitride having a random structure in which hexagonal network layers are randomly stacked (hereinafter referred to as “t-BN”), and cubic boron nitride (hereinafter referred to as “t-BN”) ( Hereinafter, it is referred to as “c-BN”).

  It is known that h-BN crystals have the same cleavage properties as hexagonal graphite crystals and exhibit good solid lubricity. The origin of the lubricity of the h-BN crystal is the van der phals bond in which the bond between the two-dimensional hexagonal mesh layers is weak as in the case of graphite, showing remarkable cleavage in this plane, and cleaving in a scaly manner between the layers. This is presumably because the crystal particles have the property of being slippery to each other.

  In the present invention, a two-dimensional crystal structure is developed, but the layered state between layers does not develop as much as h-BN, and crystalline boron nitride having a turbulent layer structure is formed by randomly stacking hexagonal network layers. It is called sex t-BN. The characteristic structure of this crystalline t-BN can be defined by a characteristic peak obtained by measuring a powder X-ray diffraction diagram, and is shown, for example, in FIG. 2 of JP-A-10-203807. Diffraction pattern.

  The crystalline t-BN fine powder is heated in a reaction vessel containing a mixed raw material containing, for example, anhydrous boric acid and urea (further, an alkali borate such as sodium borate as an optional component) in a non-oxidizing atmosphere. (Preferably 950 ° C. or lower) to form a-BN, and then the reaction product is heated at 1200 ° C. or higher and 1500 ° C. or lower (preferably 1200 to 1400 ° C., more preferably 1250 to 1350 ° C.). It can be synthesized in high yield by crystallizing -BN into t-BN. The obtained reaction product is purified by washing with water (preferably with hot water) (including pickling if necessary), and excluding soluble components such as alkali and boron oxide, the average particle size of primary particles is 1 μm or less. Crystalline t-BN fine powder can be produced in high yield and mass-produced at low cost. According to this synthesis method, the particle size of the primary particles can be changed by changing the temperature and time for crystallization, and boron nitride powder in which h-BN and crystalline t-BN coexist can be synthesized. it can. This synthesis method is described in detail in JP-A-10-203807, and the contents thereof are incorporated herein by reference as necessary.

  Crystalline t-BN synthesized and purified as described above is usually a secondary particle in which fine primary particles having a particle size of 1 μm or less are aggregated. However, if forcibly dispersed, most of the particles are primary particles. A dispersion of a certain crystalline t-BN fine powder can be obtained. Dispersion is carried out using an attrition mill, ball mill, or other (including two or three) roll type shearing mills using ceramic beads (such as zirconia) or balls as grinding media as required. Fine primary particles having an average particle size of 1 μm or less (preferably an average particle size of 0.5 μm or less, more preferably 0.3 μm or less, most preferably 0.1 μm or less) by wet pulverization or dry pulverization such as a jet mill. Can be disintegrated and dissociated. This crystalline t-BN fine powder does not have the hygroscopic property found in a-BN powder, and is stable and resistant to oxidation. According to the above-described production method, it is possible to provide fine powder having the same particle size distribution for h-BN, and crystalline boron nitride finely composed mainly of crystalline t-BN partially containing h-BN. Powder production is also possible. That is, when the crystalline t-BN fine powder is heat-treated at 1450 ° C. or higher, conversion to h-BN starts, and a powder in which t-BN and h-BN are mixed is obtained. The boron nitride fine powder dispersed in the water-soluble metalworking fluid exhibits excellent lubricity when the proportion of the crystalline t-BN fine powder is large. In order to exhibit excellent lubricity, preferably 50% by weight or more (70% by weight or more, more preferably 80% by weight or more, more preferably 90% by weight or more) of boron nitride fine powder contained in a water-soluble metalworking fluid. Is preferably crystalline t-BN fine powder. The content of crystalline t-BN fine powder in the boron nitride fine powder is the same as that of standard boron nitride fine powder whose mixing ratio is known. It can be measured by comparing with the intensity of powder X-ray diffraction.

  Both the h-BN powder and the crystalline t-BN fine powder are composed of cleaved crystal particles, and the h-BN fine powder and the crystalline t-BN fine powder, particularly the crystalline t-BN fine powder are excellent solids. Shows lubricity.

  The fine boron nitride powder of h-BN or crystalline t-BN shows a good lubricating effect even with a smaller addition amount. For this reason, it is preferable that the average particle diameter of the boron nitride fine powder in the water-soluble metalworking fluid is 1 μm or less including the secondary particles. If the boron nitride fine powder is pulverized by a mill or the like, the secondary particles can be dispersed relatively easily to fine powders composed of fine primary particles.

  The mixing amount of boron nitride fine powder in the water-soluble metalworking fluid has an appropriate and economical content depending on the use conditions, but it can provide a good lubricating effect and cover a wide range of lubrication conditions. The mixing amount of boron nitride fine powder in the water-soluble metalworking fluid at the time (diluted state) is 0.001 wt% or more and less than 0.1 wt%, and 0.1 to 35 wt% in the stock solution state It is preferable to do this. The reason is that when the mixing amount is 0.1% by weight or less (in the state of the stock solution), the obtained lubricating effect is small, and when it exceeds 35% by weight, it is difficult to uniformly disperse, and the fluidity is impaired. This is because it becomes difficult to exhibit the proper lubricating properties. In order to exhibit lubricity with good cost performance, the mixing amount of boron nitride fine powder is particularly preferably 0.1 to 25% by weight.

  The crystalline t-BN fine powder having a developed two-dimensional crystal structure has a primary disk having a substantially disk shape or a substantially spherical shape, and has excellent lubrication performance. The shape of the primary particles can be observed with a scanning electron microscope (SEM) photograph, for example, a shape like the SEM photograph of FIG. 5 of JP-A-10-203807. Since the addition of the crystalline t-BN fine powder can impart excellent lubricity to the water-soluble metalworking fluid, in the present invention, preferably the primary particles of boron nitride fine powder contained in the water-soluble metalworking fluid are contained. 50% by weight or more, more preferably 70% by weight or more, and (most preferably substantially all) is substantially disc-shaped or substantially spherical. The primary particles of the crystalline t-BN fine powder do not have a hexagonal plate shape like the crystalline particles of h-BN because the crystalline t-BN has regularity in the stacking relationship between the layers of the two-dimensional network layer. It is understood that it is because it does not have.

As an emulsifier constituting the water-soluble metalworking fluid of the present invention, an anionic surfactant, a nonionic surfactant, or a mixture thereof can be used. The HLB (hydrophile-lipophile balance) of the emulsifier is preferably about 10 to 18, more preferably 12 to 16, when mineral oil is used as the lubricating base oil. When synthetic oil or animal or vegetable oil is used as the lubricating base oil, or when the amount of additive added is large, the HLB may be different, so confirmation is required each time. The content of emulsifier is preferably 0.1 to 30 weight percent based on the total composition (in undiluted state), Ri more preferably 0.1 to 20 wt% der, i.e. preferably in diluted state 0 0.001% or more and less than 30% by weight, more preferably 0.001% or more and less than 20% by weight .

  Anionic surfactants include (1) soaps made from natural beef tallow, coconut oil, palm oil, etc., rosin soaps, carboxylates such as alkyl ether carboxylates, and (2) linear alkylbenzene sulfonic acids. Salts, α-olefin sulfonates, dialkyl sulfosuccinates, sulfonates such as naphthalene sulfonates, (3) sulfate salts such as alkyl sulfate salts, alkyl ether sulfate salts, (4) phosphate ester salts, There are acyl-N-methyl taurate salts, and nonionic surfactants include (5) ester types such as glycerin fatty acid ester, sorbitan fatty acid ester, sucrose fatty acid ester, (6) polyoxyethylene alkyl ether, A part of ethylene oxide in which components are replaced with propylene oxide, polyoxyethylene alkyl There are other nonionic surfactants such as phenyl ether, ether type such as polyoxyethylene / polyoxypropylene glycol, (7) ester ether type, (8) fatty acid alkanolamide type, alkyl polyglycoside, etc. The agent is compatible with the base oil, other additives, and the like, and depending on the combination, the emulsification may become unstable.

  The water-soluble metalworking fluid of the present invention uses the above-described base oil, nitrided fine powder, and emulsifier, and added to the water system an oil system in which the nitrided fine powder is dispersed and contained in the base oil, The mixture is dispersed and emulsified in the form of fine particles by high-speed stirring using a mixer, homogenizer, or a stirring mixer such as a colloid mill, preferably a homogenizer.

  Prior to this high-speed stirring, the fine powder of nitriding shelf powder is pulverized and mixed with the base oil using various mills, mixers, homogenizers, etc., and dispersed sufficiently finely and uniformly. Preferably, if the nitridation shelf fine powder is pulverized and mixed with a small amount of base oil in advance, the collision between the nitridation shelf fine powders increases and can be crushed more finely. The average particle diameter of the oil droplets containing the fine powder of nitrided nitride which has been dispersed and emulsified in this way is 2 μm or less, preferably 1 μm or less. Stabilizes and at the same time exhibits a more stable lubricating action.

  Prior to this high-speed stirring, the total amount of the emulsifier is added to either one of the oil system or the water system, or is added in appropriate portions to both of these systems and mixed and stirred well. Preferably, the selected emulsifier is heated to about 60 ° C. until it is properly dissolved, and then mixed and stirred. Regardless of the presence or absence of an emulsifier, it is preferable to heat both oil and water because the emulsification is easier. After emulsification, it is preferably forcibly cooled to near normal temperature in order to stabilize the emulsified state.

  In a preferred embodiment of the present invention, an antioxidant, a viscosity index improver, a pour point depressant, an anti-corrosion agent, an antirust agent, an oil improver, and an extreme pressure added to the oil system and / or water system according to use conditions. Add agent, antifoaming agent, etc.

  When an additive is added to the oil system, if the additive is added after heating to about 60 ° C., the viscosity is lowered and it becomes easy to handle. Further, after the addition, it is preferable to heat the oil system to 60 ° C. and mix to facilitate dispersion. The addition of the additive is preferably carried out after dispersing the fine powder of nitrogen nitride in the base oil. This is because, if the additive is added first, the pulverization of the nitrided nitride fine powder is prevented and it becomes difficult to remove the agglomeration. When an additive is added to the aqueous system, it is preferable to knead the emulsion with a mixer, a homogenizer or the like after the emulsion is cooled and after the emulsified state is stabilized. When adding before emulsification, it is necessary to confirm beforehand that emulsification stability is not inhibited. In addition, when an additive that is hardly soluble in water is added, it is necessary to take measures such as adding it after dissolving it in other water-soluble additives in advance.

  Examples of the antioxidant include (1) 2,6-ditertiary-butyl-paracresol (DBPC) phenol radical scavenger, (2) phenyl-alpha-naphthylamine, dialkyldiphenylamine amine radical scavenger, 3) Hydroperoxide decomposer of ZnDTP, (4) benzotriazole, zinc dialkyldithiophosphates, dialkyl selenium, metal phenates, metal deactivators of organic nitrogen compounds, and the like can be used.

  As the viscosity index improver, polymethacrylate, polyacrylate, polyisobutylene, olefin (copolymer) copolymer, polyalkylstyrene, ethylene-propylene copolymer, styrene-diene copolymer hydride, and the like can be used.

  As the pour point depressant, polymethacrylate (low molecular weight), polyacrylate, chlorinated paraffin-naphthalene condensate, chlorinated paraffin-phenol condensate, polyalkylstyrene, and the like can be used.

  As the anti-corruption agent, benzoisothiazoline compounds, triazine compounds, phenol compounds, formaldehyde donor compounds, salicylanilide compounds, and the like can be used.

  Examples of the rust inhibitor include (1) metal soaps, carboxylates of amine salts, (2) carboxylic acids of alkenyl succinic acid derivatives, (3) sulfonates of metal sulfonates and dialkylnaphthalenesulfonates. (4) Oleic acid and its salts oleic acid system, (5) Sorbitan monooleate ester system, (6) Alkylamine, acid alkyl phosphate ester, dibutyl acid phosphate ester phosphate and phosphate system Etc. can be used.

  As the oiliness improver, higher fatty acids, higher alcohols, fatty acid amines, fatty acid amides, esters and the like can be used.

  Examples of the extreme pressure additive include (1) sulfur-based olefin polysulfide, sulfurized fat and oil, dibenzyl disulfide, etc., (2) alkyl and allyl phosphate esters, alkyl and allyl subesters, phosphate ester amine salts, and thiophosphate Phosphorous compounds such as esters and amine salts of thiophosphates, and (3) organometallic compounds such as naphthenates can be used.

  As the antifoaming agent, silicone oil, silicone polymers, esters, polyhydric aliphatic alcohols, alkenyl succinic acid derivatives, metal soaps, polyacrylates, acylated polyamides, and the like can be used.

  In a further preferred embodiment of the present invention, a water-soluble metalworking fluid containing a water-soluble amine, an oil-soluble amine, and a fatty acid in the aqueous system is provided. Examples of the water-soluble amine include triethanolamine, triisopropanolamine, methyldiethanolamine, dimethylethanolamine, monoisopropanolamine, 2-amino-2-methyl-1-propanol, 2- (2-aminoethoxy) ethanol, diethyl Monoisobropanolamine, N, N-dibutylaminoethanol, N, N-di-n-butylaminoisopropanol, N, N-di-n-propylaminoisopropanol, N, N-ditertiary butyldiethanolamine, N, N -Ethylenediamine (diisopropanol), N, N-ethylenediamine (diethanol), mono-n-butyldiethanolamine, monoethyldiisopropanolamine, etc., but other water-soluble amines or inorganic alkalis You may also contain.

  Specifically, one or two kinds from triisopropanolamine and methyldiethanolamine, and one or two kinds from monoisopropanolamine, 2-amino-2-methyl-1-propanol and 2- (2-aminoethoxy) ethanol. Combinations are listed.

  Examples of the fat-soluble amine include monocyclohexylamine, dicyclohexylamine, 1,3-bisaminomethylcyclohexane, metaxylenediamine, morpholine, laurylamine, and oleylamine.

  Examples of the fatty acid include linear and / or branched saturated and / or unsaturated fatty acid and / or dibasic acid. For example, caproic acid, enanthic acid, caprylic acid, pelargonic acid, capric acid, undecanoic acid, dodecanoic acid, tridecanoic acid, pentadecanoic acid, heptadecanoic acid, nonadecanoic acid, lauric acid, myristic acid, palmitic acid, stearic acid, arachidic acid, Behenic acid, isostearic acid, elaidic acid, oleic acid, linoleic acid, linolenic acid, hydroxylauric acid, hydroxymyristic acid, hydroxypalmitic acid, hydroxystearic acid, hydroxyarachidic acid, hydroxybehenic acid, ricinoleic acid, hydroxy Examples include octadecenoic acid, sebacic acid, dodecanedioic acid, dodecyl succinic acid, lauryl succinic acid, stearyl succinic acid, isostearyl succinic acid, and dimer acid. Examples of unsaturated fatty acids include heptenoic acid, octenoic acid, nonenoic acid, decylene acid, undecylenic acid, dodecylene acid, tridecylenic acid, nonadecenoic acid, eicosenoic acid, isoheptenoic acid, isooctenoic acid, isononenic acid, isodecylenic acid, and isoundecylene. Acid, isododecylenic acid, isotridecylenic acid, heptanedienoic acid, octanedienoic acid, nonanedienoic acid, decandienoic acid, undecandienoic acid, dodecandienoic acid, tridecandienoic acid, isoheptanedienoic acid, isooctanedienoic acid, isononandienenoic acid, isodecane Examples include dienoic acid, isoundecanedienic acid, isododecanedienic acid, isotridecanedienic acid, and neodecenoic acid. In addition, fatty acids obtained from natural fats and oils such as animals, fish, plants and grains may be used.

  Although the result of having performed a metal working test using the high-performance water-soluble metal working oil of the present invention will be specifically described below, these examples are merely examples of the present invention and are not intended to be limited.

[Example 1] Production of crystalline t-BN fine powder A capacity of 3.5 kg of anhydrous boric acid, 5.3 kg of urea, and 0.63 kg of borax (Na ₂ B ₂ O ₃ · 10H ₂ O) can be sealed. In a 12-liter stainless steel pressure vessel, the temperature was raised to 900 ° C. in about 1 hour, and kept at 900 ° C. for about 10 minutes to complete the reaction, thereby synthesizing a-BN. During this reaction, water and carbon dioxide gas are released from the reaction system and the pressure inside the reaction vessel rises, so that the reaction vessel was filled with a mixed gas of water and carbon dioxide gas higher than 1 atm. Next, the carme-baked reaction product taken out from the reaction vessel was pulverized into particles of 1 mm or less, and the pulverized product was placed in an alumina container with a lid and placed in an electric furnace having a nitrogen gas atmosphere, and the temperature was increased to 1300 ° C. over 10 hours. The mixture was further heated to 1300 ° C. for 2 hours to crystallize t-BN to obtain a crystalline t-BN fine powder. In this crystallization, sodium borate coexisting with a-BN serves to promote the conversion of a-BN to crystalline t-BN, so that a crystalline t-BN fine powder can be synthesized in high yield. Since the crystallized t-BN fine powder sewn contains sodium borate and other impurities, it is purified by washing with ion-exchanged water at about 80 ° C. and about 0.63 kg (boron conversion yield: about 70%) A crystalline t-BN fine powder was obtained.

  As a result of analyzing these crystalline t-BN fine powders using an X-ray diffractometer, a characteristic peak was observed in crystalline t-BN, which is shown in FIGS. 2 and 7 of JP-A-10-203807. A typical example is shown.

[Example 2] Preparation of high-performance water-soluble metalworking fluid A high-performance water-soluble metalworking fluid was prepared as follows. That is, No. 1 shown in Tables 1-3. Three types of high-performance water-soluble metalworking fluids 1 to 3 were prepared. The raw materials were prepared by dividing into three types: oil-based, water-based and soap.

  First, an oil system was prepared. Machine oil No. 46 and t-BN are separated into containers, and using a homogenizer (manufactured by KINEMATICA AG, polytron low noise homogenizer, main body model number: PT6100, generator shaft model number: DA6050 / 2, but DA6050 / 6 is used only during emulsification) Stir and mix well at 7000 rpm for 10 minutes.

  The remaining oil-based raw material, except for polyoxyethylene polyoxypropylene alkyl ether, which is a nonionic surfactant as an emulsifier, is added to the mixture, warmed to 60 ° C. with a water bath, and 7000 rpm using a homogenizer. And stirred well for 10 minutes.

  To this mixture, polyoxyethylene polyoxypropylene alkyl ether was added, warmed to 60 ° C. with a hot water bath, and well stirred and mixed by hand with a glass rod.

  A water system was prepared in parallel. Water and polyoxyethylene polyoxypropylene alkyl ether were placed in a container, warmed to 60 ° C. with a hot water bath, and thoroughly stirred and mixed by hand with a glass rod.

  The previously prepared oil system was added to this water system, and the mixture was well stirred, mixed and emulsified at 7000 rpm for 3 minutes using a homogenizer. The emulsion was immersed in tap water as it was in a container and cooled with stirring until the temperature reached 30 ° C. or lower. After that, for those not using soap, a Silycon antifoam was added as it was, and the mixture was thoroughly stirred and mixed at 7000 rpm for 3 minutes with a homogenizer.

  Separately, soap was prepared. A total of 856 g was prepared, which is larger than the amount required for this preparation. Coconut oil fatty acid was dissolved in a hot water bath, and the required amount was placed in a container. All other raw materials were placed in a container and stirred and mixed well with a homogenizer at 7000 rpm for 10 minutes.

  Each soap was added to the emulsion in the required amount, and the mixture was well stirred and mixed with a homogenizer at 7000 rpm for 3 minutes. By the above, the high performance water-soluble metalworking fluid of the composition shown in Tables 1-3 was prepared. Of these, No. Regarding 1 and 2, when the particle size distribution of oil droplets was measured using a laser diffraction particle size distribution measuring device (SALD-2000, manufactured by Shimadzu Corporation), the former had an average value of 0.624 μm and a standard deviation of 0.103 μm. The latter has an average value of 0.699 μm and a standard deviation of 0.094 μm, and when calculating the average value + 3σ, the particle size of most of the oil droplets is as shown by the fact that they are 0.933 μm and 0.981 μm, respectively. It was 1 μm or less.

(Table 1) High-performance water-soluble metalworking fluid (stock solution) No. Composition of 1

(Table 2) High performance water-soluble metalworking fluid (stock solution) No. Composition of 2

[Example 3] Cutting test 1
Test conditions are
(1) Used machine: Mori Seiki vertical machining center (MV-40A)
(2) Work material: AC8B-T6
(3) Tool: OSG New Roll Tap B-NRT M6 × 1.0RH7 B
(4) Cutting speed: 10 m / min (5) Pilot hole: φ5.48 x 30 mm (reamer finish, blind hole, catch rate 100%)
(6) Cutting length: 20mm
(7) Water-soluble cutting fluid (stock solution) concentration: 10%
(8) Number of processing: 5 times, commercially available water-soluble cutting fluid A and high performance water-soluble metal processing fluid No. 1 in Table 1. 1 and a comparative test by torque evaluation. However, the cutting fluid was only put in the pilot hole. As a result, high performance water-soluble metalworking fluid No. It was confirmed that No. 1 can be cut with a 15% lower torque than the commercially available water-soluble cutting fluid A.

[Example 4] Cutting test 2
Test conditions are
(1) Machine used: Precision tabbing machine handled by Yamawa Engineering (Mega Tap II-G8)
(2) Work material: AC4B
(3) Tool: OSG New Roll Tap B-NRT M6 × 1.0RH7 B
(4) Cutting speed: 10 m / min (5) Pilot hole: φ5.50 ± 0.05 × 25 mm (blind hole),
(6) Cutting length: 15mm
(7) Water-soluble cutting fluid (stock solution) dilution ratio: 10, 20, 50, 100 times
(8) Number of processing: 20 times, commercially available water-soluble cutting fluid B and high performance water-soluble metal processing fluid No. 2 and a comparative test by torque evaluation. However, the cutting fluid was only put in the pilot hole. The results are as shown in Table 4 below, and the high performance water-soluble metalworking fluid No. Compared with the commercially available water-soluble cutting fluid B, No. 2 has high cutting performance at a high dilution ratio (particularly practical even at 100 times), and it was found that it can be used at a dilution of 2 times or more.

Claims (13)

  A metal characterized in that a metal material is processed using a water-soluble metalworking fluid containing 0.001% by weight or more and less than 0.1% by weight of boron nitride fine powder having a crystalline disordered layer structure based on the total composition. Product manufacturing method.   The manufacturing method according to claim 1, wherein the manufacturing method includes cutting, grinding, polishing, or a combination thereof.   The manufacturing method according to claim 1, wherein the metal material is a titanium alloy or Inconel.   The said water-soluble metalworking oil agent contains the boron nitride fine powder of the said crystalline disordered layer structure in the aqueous system liquid containing the oil system of the emulsified form, It is any one of Claims 1-3 characterized by the above-mentioned. Manufacturing method.   5. The production method according to claim 1, wherein 50% by weight or more of boron nitride contained is a boron nitride fine powder having a crystalline disordered layer structure.   The manufacturing method according to claim 1, wherein an average particle diameter of primary particles of the boron nitride fine powder is 0.5 μm or less.   The production method according to claim 1, wherein 50% by weight or more of the boron nitride fine powder is primary particles having an average particle size of 0.3 μm or less.   The manufacturing method according to any one of claims 1 to 7, wherein 50% by weight or more of the boron nitride fine powder observed with an electron microscope has a substantially spherical shape or a substantially disc shape.   9. The production according to any one of claims 1 to 8, wherein the oil system is emulsified using an anionic surfactant and / or a nonionic surfactant as an emulsifier. Method.   The said water-soluble metalworking oil agent is 0.001 weight% or more and less than 20 weight% of content of an emulsifier on the basis of the whole composition, The manufacture as described in any one of Claims 1-9 characterized by the above-mentioned. Method.   The water-soluble metalworking oil is selected from the group consisting of antioxidants, viscosity index improvers, pour point depressants, antiseptics, rust inhibitors, oiliness improvers, extreme pressure additives, and antifoaming agents. The production method according to any one of claims 1 to 10, wherein more than one seed is added.   The said water-soluble metalworking fluid contains a water-soluble amine, an oil-soluble amine, and a fatty acid, The manufacturing method as described in any one of Claims 1-11 characterized by the above-mentioned. A water-soluble metalworking fluid comprising 0.001 wt% or more and less than 0.1 wt% of crystalline boron nitride fine powder based on the total composition.