JP5927395B2 - Electrical discharge machining liquid composition and electrical discharge machining method - Google Patents

Description

  The present invention relates to an electric discharge machining liquid composition and an electric discharge machining method using the electric discharge machining liquid composition.

  In electric discharge machining, metal engraving, opening, cutting, etc. are performed by applying high-frequency voltage between the machining electrode and the conductive workpiece in the electric discharge machining fluid, which is an insulating medium, to melt and remove the metal. It is a processing method. Conventionally, petroleum solvents such as kerosene have been used as an electric discharge machining liquid composition used for electric discharge machining. However, since petroleum solvents such as kerosene are highly flammable and have a high risk of fire during electric discharge machining, aqueous electric discharge machining liquid compositions have come to be used as nonflammable electric discharge machining liquids. ing. Water-based electrical discharge machining fluid compositions use water as the main component, but since water-based electrical discharge machining fluid compositions have poor anti-corrosion performance on workpieces and processing equipment, An aqueous electric discharge machining liquid composition to which components are added has been proposed.

  For example, Patent Documents 1 and 2 disclose an electric discharge machining liquid composition containing benzotriazole and saccharides as rust preventive components. Patent Document 3 discloses an electric discharge machining liquid composition having a rust-preventing effect, which contains 1,1,1-tris (hydroxymethyl) ethane. However, the electrical discharge machining fluid compositions disclosed in Patent Documents 1 to 3 sometimes fail to provide a sufficient rust prevention effect.

Japanese Patent No. 2598715 JP-A-4-250921 JP 61-188022 A

  This invention is made | formed in view of the said situation, The objective is providing the electric discharge machining liquid composition which has a sufficient metal rust prevention effect, and the electric discharge machining method using the said electric discharge machining liquid composition. It is in.

  The electric discharge machining fluid composition of the present invention that has solved the above problems is characterized in that it contains an imide compound and water. The electrical discharge machining fluid composition of the present invention has a sufficient metal rust prevention effect due to the above-described configuration.

  The imide compound is preferably an imide compound represented by the following formula (1), and more preferably at least one selected from the group consisting of succinic imide, maleic imide, glutaric imide, and phthalic imide. preferable. Such an imide compound is likely to have high solubility in water, and the rust preventive effect of the electric discharge machining liquid composition is sufficiently exhibited.

[In Formula (1), R represents a C1-C6 alkylene group, a C1-C6 alkenylene group, or a phenylene group. ]

  The electrical discharge machining fluid composition of the present invention preferably contains 0.001% by mass or more and 1.0% by mass or less of the imide compound. When the content of the imide compound is in the above range, the rust preventive effect of the electric discharge machining liquid composition is easily exhibited, and electric discharge machining in the electric discharge machining liquid composition is facilitated.

  The electrical discharge machining fluid composition of the present invention preferably further contains a benzotriazole compound. If the electric discharge machining liquid composition contains a benzotriazole compound, the rust prevention effect of the electric discharge machining liquid composition is easily enhanced by a synergistic effect with the imide compound. Also, in order to use the electric discharge machining liquid composition for a long period of time, when the electric discharge machining liquid composition is passed through an ion exchange resin to remove ionic impurities, the imide compound is hardly removed from the electric discharge machining liquid composition. .

  The electric discharge machining fluid composition of the present invention preferably further contains sugar. If the electrical discharge machining fluid composition contains sugar, the rust prevention effect of the electrical discharge machining fluid composition is easily enhanced by a synergistic effect with the imide compound.

  The present invention also provides an electric discharge machining method characterized by performing electric discharge machining in a liquid containing the electric discharge machining liquid composition. According to the electric discharge machining method of the present invention, it becomes easy to prevent rusting of a metal to be machined in electric discharge machining.

  The electric discharge machining fluid composition of the present invention has a metal rust prevention effect. Moreover, according to the electric discharge machining method of the present invention, it becomes easy to prevent rusting of the metal to be machined.

  The electric discharge machining fluid composition of the present invention is characterized by containing an imide compound and water.

  The imide compound used in the electric discharge machining liquid composition is not particularly limited as long as it has a structure in which two carbonyl groups are bonded to the nitrogen atom of primary amine or ammonia. When the electrical discharge machining liquid composition of the present invention contains an imide compound, rusting of the metal is less likely to occur when the metal is subjected to electrical discharge machining in the electrical discharge machining liquid composition.

  As the imide compound, an imide compound obtained by dehydration condensation of ammonia and dicarboxylic acid is preferable, and an imide compound represented by the following formula (1) is more preferable. In the following formula (1), R represents an organic group, and preferably R is an alkylene group having 1 to 6 carbon atoms, an alkenylene group having 1 to 6 carbon atoms (two hydrogen atoms from any carbon atom of the alkene). A divalent group from which atoms are removed) or a phenylene group. An imide compound in which R is an alkylene group having 1 to 6 carbon atoms, an alkenylene group having 1 to 6 carbon atoms, or a phenylene group is preferable because the solubility of the imide compound in water tends to increase.

  In the formula (1), R is more preferably an alkylene group having 1 to 4 carbon atoms, an alkenylene group having 1 to 4 carbon atoms, or an o-phenylene group. As such an imide compound, malonic acid imide, Examples include succinimide, glutaric imide, adipic imide, 2-methylglutaric imide, maleic imide, and phthalic imide. The imide compound is preferably at least one selected from the group consisting of succinic imide, glutaric imide, maleic imide, and phthalic imide, and is succinimide from the viewpoint of availability, safety, and rust prevention performance. Is particularly preferred. Succinimide has already been widely used as a surface treatment agent for silver plating and as a raw material for pharmaceutical synthesis, and the high safety of acute oral toxicity LD50 of 14 g / kg (rat) has been confirmed.

  The electric discharge machining fluid composition of the present invention preferably further contains a benzotriazole compound in addition to the imide compound and water. If the benzotriazole compound is contained in the electric discharge machining liquid composition, it becomes easy to enhance the rust prevention effect of the electric discharge machining liquid composition due to a synergistic effect with the imide compound.

  Further, if the electric discharge machining liquid composition contains a benzotriazole compound, in order to lower the electrical conductivity of the used electric discharge machining liquid, the electric discharge machining liquid is passed through an ion exchange resin to cause ionic impurities in the electric discharge machining liquid. When removing the imide compound, it is difficult to remove the imide compound from the electric discharge machining liquid containing the imide compound. In this case, the electric discharge machining can be performed in the electric discharge machining liquid for a long time. This will be described below.

  In electric discharge machining, ionic impurities gradually accumulate in the electric discharge machining liquid, and the electrical conductivity of the electric discharge machining liquid increases. In electric discharge machining, it is considered that organic substances contained in the electric discharge machining liquid are decomposed and ionic impurities are accumulated in the electric discharge machining liquid. In electric discharge machining, it is common to circulate an electric discharge machining liquid between a machining tank that performs electric discharge machining and a storage tank that stores electric discharge machining liquid and removes impurities. If the momentum of the machining fluid is intense, it is considered that carbon dioxide gas is absorbed by the electrical discharge machining fluid and ionic impurities accumulate in the electrical discharge machining fluid. If ionic impurities accumulate in the electric discharge machining liquid and the electric conductivity of the electric discharge machining liquid becomes too high (for example, more than 100 μS / cm), the electric discharge machining liquid does not function as an insulating medium, and electric discharge machining is performed. I can't do that. Therefore, in electrical discharge machining, it is preferable to adjust the electrical conductivity of the electrical discharge machining liquid to a certain range (for example, 1 μS / cm to 100 μS / cm).

  In order to adjust the electrical conductivity of the electric discharge machining liquid to a certain range, it is effective to remove the ionic impurities in the electric discharge machining liquid by passing the electric discharge machining liquid through an ion exchange resin. At this time, it is preferable to remove the ionic impurities by combining a strong basic anion exchange resin and a strong acidic cation exchange resin in terms of enhancing the removal efficiency of the ionic impurities. The strong basic anion exchange resin may be a functional group having, for example, a trimethylammonium group or a dimethylethanolammonium group, and the strong acidic cation exchange resin has a functional group, for example, a sulfonic acid group. What is necessary is just to use. And if the electric discharge machining liquid contains a benzotriazole compound, when the electric discharge machining liquid is passed through the ion exchange resin, the imide compound is removed from the electric discharge machining liquid compared to the case where no benzotriazole compound is contained. The rust preventive effect of the electric discharge machining liquid will last longer. That is, the benzotriazole compound has an effect as a sacrificial agent that protects the imide compound from adsorption of the ion exchange resin.

  The benzotriazole compound is not particularly limited as long as it has a benzotriazole skeleton in the molecule. For example, benzotriazole, 4-methylbenzotriazole, 5-methylbenzotriazole, 4-ethylbenzotriazole, 5-ethylbenzo Examples thereof include triazole, 4-isopropylbenzotriazole, 1-hydroxybenzotriazole, 4-carboxybenzotriazole, and an ester or a salt thereof, 5-carboxybenzotriazole, and an ester or a salt thereof. These may use only 1 type and may use 2 or more types together. Among these, benzotriazole is more preferable. When benzotriazole is used as the benzotriazole compound, foaming of the electric discharge machining liquid can be easily suppressed when the electric discharge machining liquid is circulated and used.

  The electric discharge machining fluid composition of the present invention preferably further contains a saccharide in addition to the imide compound and water. If sugar is contained in the electrical discharge machining fluid composition, the rust prevention effect of the electrical discharge machining fluid composition is easily enhanced by a synergistic effect with the imide compound.

  Examples of sugars include monosaccharides, disaccharides, trisaccharides, oligosaccharides in which four or more monosaccharides are bonded, and polysaccharides in which more monosaccharides are bonded, in which hydroxy groups are substituted with hydrogen, aldose terminals Uronic acid in which the carbon of this group is substituted with a carboxyl group, and sugar alcohols in which ketone groups or aldehyde groups are reduced to alcohols. Regarding the structure of the monosaccharide constituting the saccharide, the number of carbons constituting the monosaccharide is not particularly limited, such as a trimonosaccharide, a tetramonosaccharide, a pentose saccharide, a hexose saccharide, and a heptasaccharide. As the sugar, non-polysaccharide is preferable in view of high solubility in water, and sugar alcohol is more preferable. Examples of the sugar alcohol include sorbitol, mannitol, xylitol, maltitol and the like. These may use only 1 type and may use 2 or more types together.

  Next, the content rate of each component of the electric discharge machining fluid composition of the present invention will be described. The content of the imide compound in the electric discharge machining liquid composition is preferably 0.001% by mass or more, more preferably 0.005% by mass or more, further preferably 0.01% by mass or more, and 1.0% by mass or less. Is preferable, 0.5 mass% or less is more preferable, and 0.2 mass% or less is further more preferable. If the content rate of an imide compound is 0.001 mass% or more, the rust prevention effect of an electrical discharge machining fluid composition will fully be exhibited easily. On the other hand, when the content rate of an imide compound exceeds 1.0 mass%, the rust prevention effect of an electrical discharge machining fluid composition may fall. The reason for this is unclear, but it is presumed that the acidity of the electric discharge machining fluid composition is increased. Moreover, when the content of the imide compound exceeds 1.0% by mass, the amount of organic matter in the electric discharge machining liquid composition increases, and as a result, a large amount of carbonate ions are generated during electric discharge machining, and the electric conductivity of the electric discharge machining liquid. May increase. In this case, the electric discharge machining liquid may not function as an insulating medium, and it may be difficult to perform electric discharge machining. In addition, when a large amount of carbonate ions are generated during electric discharge machining, when the electric discharge machining liquid is passed through the ion exchange resin and regenerated, the consumption of the ion exchange resin increases, which tends to be uneconomical.

  The content of the imide compound in the electric discharge machining liquid composition can be made lower when the electric discharge machining liquid composition contains sugar than when the electric discharge machining liquid composition does not contain sugar. For example, when the same degree of rust prevention effect is obtained, the content of the imide compound in the electric discharge machining liquid composition can be reduced by using sugar together. Moreover, the rust prevention effect of an electrical discharge machining fluid composition can also be improved by using sugar together, without reducing the content rate of an imide compound.

  When the electric discharge machining liquid composition contains a benzotriazole compound, the content of the benzotriazole compound in the electric discharge machining liquid composition is preferably 0.0001% by mass or more, more preferably 0.0005% by mass or more, and 2 mass% or less is preferable and 0.1 mass% or less is more preferable. When the content of the benzotriazole compound is 0.0001% by mass or more, the rust prevention effect of the electric discharge machining liquid composition is easily improved, and when the electric discharge machining liquid is passed through an ion exchange resin for regeneration, an imide The imide compound becomes difficult to be removed from the electric discharge machining liquid containing the compound. On the other hand, when the content rate of a benzotriazole compound exceeds 0.2 mass%, the rust prevention effect of an electrical discharge machining fluid composition may fall. The reason for this is unclear, but it is presumed that the acidity of the electric discharge machining fluid composition is increased. Further, if the content of the benzotriazole compound exceeds 0.2% by mass, the amount of organic matter in the electric discharge machining liquid composition increases, a large amount of carbonate ions are generated during electric discharge machining, and the electric conductivity of the electric discharge machining liquid is high. There is a case. In this case, the electric discharge machining liquid may not function as an insulating medium, and it may be difficult to perform electric discharge machining. Furthermore, if a large amount of carbonate ions are generated during electric discharge machining, when the electric discharge machining liquid is passed through the ion exchange resin and regenerated, the consumption of the ion exchange resin increases, which tends to be uneconomical.

  When the electrical discharge machining fluid composition contains sugar, the content of sugar in the electrical discharge machining fluid composition is preferably 0.005% by mass or more, more preferably 0.01% by mass or more, and 0.5% by mass or less. Is preferable, and 0.3 mass% or less is more preferable. If the sugar content is 0.005% by mass or more, the rust prevention effect of the electric discharge machining fluid composition is easily enhanced. On the other hand, if the sugar content exceeds 0.5% by mass, when the electric discharge machine is dried after electric discharge machining, viscous substances may remain on the surface or gaps of the electric discharge machine, resulting in a problem with the electric discharge machine. May come. In addition, when the sugar content exceeds 0.5% by mass, the amount of organic matter in the electric discharge machining liquid composition increases, and a large amount of carbonate ions are generated during electric discharge machining, which increases the electric conductivity of the electric discharge machining liquid. There is. In this case, the electric discharge machining liquid may not function as an insulating medium, and it may be difficult to perform electric discharge machining. In addition, when a large amount of carbonate ions are generated during electric discharge machining, when the electric discharge machining liquid is passed through the ion exchange resin and regenerated, the consumption of the ion exchange resin increases, which tends to be uneconomical.

  The electric discharge machining fluid composition of the present invention may further contain a polar solvent. If a polar solvent is contained in the electrical discharge machining fluid composition, the solubility of the imide compound in water can be increased, and the stability of the imide compound dissolved in water can be increased. Further, when the electric discharge machining liquid composition contains a benzotriazole compound, the presence of the polar solvent enhances the solubility of the benzotriazole compound in water, and can increase the stability of the benzotriazole compound dissolved in water. . In particular, in order to increase the rust prevention effect of the electrical discharge machining fluid composition, when the imide compound or benzotriazole compound is contained in the electrical discharge machining fluid composition at a high concentration, a polar solvent is included in the electrical discharge machining fluid composition. Preferably.

  Examples of the polar solvent include alcohols such as methanol, ethanol, propanol and butanol; ethylene glycol, propylene glycol, diethylene glycol, polyethylene glycol, glycerin, butyl diglycol, phenyl glycol, phenyl diglycol, 1,2-octanediol, 3- Examples include glycols such as methoxy-3-methyl-1-butanol, 1-methyl-2-pyrrolidone, and methylformamide. These may use only 1 type and may use 2 or more types together. Among these, glycols such as ethylene glycol, butyl diglycol, phenyl glycol, phenyl diglycol, 1,2-octanediol, 3-methoxy-3-methyl-1-butanol; 1-methyl-2-pyrrolidone; dimethyl Formamide is preferable, and ethylene glycol, 3-methoxy-3-methyl-1-butanol, and 1-methyl-2-pyrrolidone are particularly preferable.

  When the electrical discharge machining fluid composition contains a polar solvent, the content of the polar solvent in the electrical discharge machining fluid composition is preferably 0.5% by mass or less, more preferably 0.4% by mass or less, and 0.3% by mass. More preferred are: The minimum of the content rate of a polar solvent is not specifically limited. If the content of the polar solvent exceeds 0.5% by mass, the amount of organic matter in the electrical discharge machining fluid composition increases, and a large amount of carbonate ions are generated during electrical discharge machining, which may increase the electrical conductivity of the electrical discharge machining fluid. is there. In this case, the electric discharge machining liquid may not function as an insulating medium, and it may be difficult to perform electric discharge machining. In addition, when a large amount of carbonate ions are generated during electric discharge machining, when the electric discharge machining liquid is passed through the ion exchange resin and regenerated, the consumption of the ion exchange resin increases, which tends to be uneconomical.

  The electric discharge machining fluid composition of the present invention may further contain an antifoaming agent. As the antifoaming agent, conventionally known ones such as glycol type and silicon type can be used. For example, “KM-73A”, “KF-96”, “KS-604”, Dow, manufactured by Shin-Etsu Chemical Co., Ltd. An FS anti-foam “DK Q1-1247” manufactured by Corning Asia may be used. An antifoamer should just be contained in an electrical discharge machining fluid composition to such an extent that the effect of this invention is not impaired.

  The electric discharge machining fluid composition of the present invention is a mixture of an imide compound and water, and if necessary, a mixture of at least one from the group consisting of a benzotriazole compound, a sugar, a polar solvent, and an antifoaming agent. Can be obtained. At this time, it is preferable that each component except water is dissolved in water.

  Next, the electric discharge machining method of the present invention will be described. The electric discharge machining method of the present invention is characterized by performing electric discharge machining in a liquid containing the electric discharge machining liquid composition. In the electric discharge machining method of the present invention, a conventionally known electric discharge machining method can be adopted except that a liquid containing the electric discharge machining liquid composition is used as an insulating medium. That is, in the liquid containing the electric discharge machining liquid composition, by applying a high frequency voltage between the machining electrode and the conductive workpiece to melt and remove the metal, sculpting, opening, cutting, etc. Good. When performing electric discharge machining, it is preferable to use the electric discharge machining liquid composition as it is as an electric discharge machining liquid and perform electric discharge machining in the electric discharge machining liquid composition. According to the electric discharge machining method of the present invention, it becomes easy to prevent rusting of a metal to be machined in electric discharge machining.

  Hereinafter, the present invention will be described in more detail with reference to examples, but the scope of the present invention is not limited thereto.

(1) Preparation of electrical discharge machining fluid composition As shown in Table 1, each reagent was blended at a predetermined ratio, and each component was dissolved in water to obtain an electrical discharge machining fluid composition. In Table 1, succinimide, maleic imide, and glutaric imide correspond to imide compounds, D-sorbitol corresponds to sugar, benzotriazole corresponds to benzotriazole compound, and N-methyl-2-pyrrolidone. Corresponds to a polar solvent. Incidentally, 1,1,1-tris (hydroxymethyl) ethane has been used as a comparative object as a component conventionally used in electric discharge machining liquid compositions.

  For each reagent, maleic imide and glutaric imide are those sold by Tokyo Kasei Kogyo Co., Ltd., benzotriazole is “CVI” manufactured by Kyrest, and silicon-based antifoaming agent is Shin-Etsu Chemical. "KM-73A" manufactured by Kogyo Co., Ltd. was used, and the others were those sold by Kanto Chemical Co., Inc.

(2) Test method (2-1) Measurement of electrical conductivity The electrical conductivity of each electric discharge machining fluid composition was measured using a conductivity meter EC Testr11 + (manufactured by ASONE). The measurement results are shown in Table 1.

(2-2) Rust prevention test In a 500 mL beaker, 400 mL of each electric discharge machining fluid composition obtained in (1) above was placed, and a test piece (SPCC: cold rolled steel plate, # 240 polished, 60 mm × 80 mm ×). 1.2 mm) was immersed and left at 25 ° C. for 48 hours, and then the rust generation state of the test piece was observed. The production of the test piece and the evaluation of the degree of rust generation based on the rust occurrence state of the test piece were performed based on JIS K 2246: 2007. Evaluation of the degree of rust occurrence is shown in Table 1 in accordance with the following criteria.
A: 0% rust occurrence
B: Rust occurrence is 1% to 10%
C: Rust occurrence is 11% to 25%
D: Rust occurrence is 26% to 50%
E: Rust occurrence is 51% to 100%

(2-3) Ion-exchange resin flow test A 500 mL beaker was charged with 500 mL of the electric discharge machining fluid composition, and the electric discharge machining fluid composition was stirred with a stirrer while using a circulation pump to make the electric discharge machining fluid composition strong acid positive. The solution was passed through a column packed with 15 mL of an ion exchange resin (Amberlite IR120B, Organo) and a column packed with 15 mL of a strongly basic anion exchange resin (Amberlite IRA400, manufactured by Organo). It was circulated. The strongly acidic cation exchange resin used in the test has polystyrene as a skeleton and a sulfonic acid group as a functional group. The strongly basic anion exchange resin used in the test has polystyrene as a skeleton and trimethylammonium as a functional group. Had a group. The electric discharge machining fluid composition was passed through the column at 25 ° C. at a flow rate of 15 mL / min. At the start of the flow, 50 mL of deionized water remained in the column and the tube connected to the column.

  The ion exchange resin flow test was conducted using the electric discharge machining liquid composition No. 4 (containing succinimide and D-sorbitol), EDM composition No. 12 (containing succinimide, D-sorbitol, and benzotriazole), electrical discharge machining fluid composition No. 17 (containing D-sorbitol and benzotriazole), respectively, and electric discharge machining composition No. 4 is passed through, and the same ion exchange resin is subjected to the electrical discharge machining composition No. 17 was conducted. Each concentration of succinimide, D-sorbitol, and / or benzotriazole in the electric discharge machining fluid composition in the beaker after 0 minutes, 30 minutes, 60 minutes, 120 minutes, 180 minutes, and 240 minutes from the start of liquid flow Was measured. Succinimide and D-sorbitol were measured using liquid chromatography (Shodex, Showa Denko KK, detector: RI differential refractometer), and benzotriazole was measured using an ultraviolet-visible spectrophotometer (V-630, Japan). (Manufactured by Spectroscopic Co., Ltd., detection wavelength: 265 nm). The residual ratio of each component at each elapsed time was calculated assuming that the concentration of each component at 0 minutes was 100%, and the results are shown in Tables 2 and 3.

(3) Test results (3-1) Rust prevention test and conductivity EDM composition No. Each of Nos. 1 to 12 contained an imide compound, and in the rust prevention test, all had an evaluation of the degree of rust generation of C or more, and had a sufficient rust prevention effect. In addition, EDM composition No. Nos. 1 to 12 have low conductivity values of 20 μS / cm or less, and were found to be usable for electric discharge machining.

  Electric discharge machining composition No. No. 1 contained 0.05% by mass of an imide compound, and the degree of rust generation was C evaluation. Further, the electrical discharge machining fluid composition No. 1 with an increased imide compound content was used. In 2, the rust generation degree improved to B evaluation.

  An electrical discharge machining fluid composition No. containing an imide compound and D-sorbitol. 4 to 6, the degree of rust generation was evaluated as A or B, and the electrical discharge machining liquid composition No. Rust prevention effect was improved more than 1. On the other hand, the electrical discharge machining composition No. containing 0.2% by mass of D-sorbitol without containing an imide compound. In No. 13, the degree of rust occurrence was E evaluation.

  EDM composition No. 1 containing an imide compound and benzotriazole In No. 7, the degree of rust generation was evaluated as B, and the electrical discharge machining composition No. Rust prevention effect was improved more than 1. On the other hand, the electric discharge machining composition No. containing no imide compound and containing benzotriazole. 14-16, the electrical discharge machining fluid composition No. Even when the blending amount of benzotriazole was increased from 7, the degree of rust generation was D or E evaluation.

  In addition to the imide compound, EDM composition No. 1 containing D-sorbitol and benzotriazole was blended. In 8-12, rust generation | occurrence | production degree became more than C evaluation even with a smaller amount of imide compounds, and a sufficient rust prevention effect was obtained. Electric discharge machining composition No. Nos. 8 to 10 are EDM compositions containing D-sorbitol and benzotriazole. Compared to 17, the rust prevention effect was improved. In addition, EDM composition No. In 8-10, the rust prevention effect improved as the compounding quantity of the imide compound increased.

  Electric discharge machining composition No. 18 contained 1,1,1-tris (hydroxymethyl) ethane used as a rust preventive component described in Patent Document 3, but the degree of rust generation was E evaluation, and the rust preventive effect was not good. It was enough. Moreover, the electrical discharge machining fluid composition No. which performed the rust prevention test with deionized water. In No. 19, point rust began to occur 10 minutes after immersion, and the degree of rust occurrence was evaluated as E.

(3-2) Ion exchange resin flow test EDM composition no. 4 (containing succinimide and D-sorbitol) and EDM composition No. When 17 (containing D-sorbitol and benzotriazole) was compared, succinimide was less likely to be adsorbed on the ion exchange resin than benzotriazole. Electric discharge machining composition No. 4 (containing succinimide and D-sorbitol) and EDM composition No. 12 (containing succinimide, D-sorbitol, and benzotriazole), the coexistence of benzotriazole resulted in suppression of adsorption of succinimide to the ion exchange resin. Electric discharge machining composition No. 4 is passed through, and the same ion exchange resin is subjected to the electrical discharge machining composition No. When 17 was passed, it was confirmed that succinimide was eluted from the ion exchange resin as benzotriazole was adsorbed on the ion exchange resin and the concentration of benzotriazole in the beaker decreased. From these results, it was found that benzotriazole has an effect as a sacrificial agent that prevents adsorption of an imide compound to an ion exchange resin.

  The electric discharge machining fluid composition of the present invention can be used for electric discharge machining. Moreover, the electric discharge machining method of the present invention can be applied to electric discharge machining.

Claims (7)

An electrical discharge machining fluid composition comprising an imide compound represented by the following formula (1) and water and having an electrical conductivity of 1 μS / cm to 100 μS / cm.

[In Formula (1), R represents a C1-C6 alkylene group, a C1-C6 alkenylene group, or a phenylene group. ]   Furthermore, the electrical discharge machining fluid composition of Claim 1 containing a benzotriazole compound.   The electric discharge machining fluid composition according to claim 1 or 2, wherein the imide compound is contained in an amount of 0.001% by mass to 1.0% by mass.   The electric discharge machining fluid composition according to any one of claims 1 to 3, wherein the imide compound is at least one selected from the group consisting of succinic imide, maleic imide, glutaric imide, and phthalic imide.   Furthermore, the electric discharge machining fluid composition according to any one of claims 1 to 4, comprising a sugar. The electrical discharge machining fluid composition according to any one of claims 1 to 5, which is an aqueous electrical discharge machining fluid composition containing water as a main component. An electric discharge machining method comprising performing electric discharge machining in a liquid containing the electric discharge machining liquid composition according to any one of claims 1 to 6 .