JPH04214797A - Water-soluble oil for cutting and grinding cemented carbide - Google Patents

Abstract

PURPOSE:To prevent the elusion of cobalt, improve the efficiency of works and protect cemented carbides in cutting and grinding works using cemented carbide tools and in works for cutting and grinding the cemented carbides. CONSTITUTION:A water-soluble oil for cutting and grinding cemented carbides contains one kind or more of alcohol amines or alkyl amines of formulas: R2 (Me Et Bu)NC2H4OH, HN(C3H6OH)2, (CH3)2NC3H6OH, C6H11N(C2H4OH)2, C6H11NH2, C6H5N(C2H4OH)2, etc.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a water-soluble cutting and grinding oil for cemented carbide, and more specifically to a fluid used in cutting using cemented carbide tools and grinding of cemented carbide materials. be.

0002

[Prior Art] Generally, cemented carbide is an alloy whose main components are tungsten carbide and cobalt, and also contains elements such as titanium and tantalum.
It has excellent properties such as hardness, strength, and toughness. For this reason, it is widely used as tool materials, structural materials, etc., and today, cutting processes using cemented carbide tools and various grinding processes on cemented carbide materials are performed. In such cutting and grinding processes, water-soluble grinding oils such as chemical type and semi-chemical type are used, and these are oils mainly containing alkanolamines such as monoethanolamine, diethanolamine, and triethanolamine.

0003

[Problem to be Solved by the Invention] However, when cutting with a cemented carbide tool or grinding a cemented carbide material using these oils, it is necessary to remove the oil, which is a component of the cemented carbide, during processing. Cobalt is eluted and causes the following problems. In other words, during cutting using a cemented carbide tool, cutting oil enters between the jig that holds the tool and the cemented carbide tool and cobalt elutes, creating a sticky substance that makes it difficult to attach and detach the tool. This is causing problems such as: In addition, (1) In the grinding of cemented carbide materials, there is also the problem that corrosion occurs on the surface due to the elution of cobalt. This problem is thought to be because alkanolamine, a component in the oil, reacts with cobalt, a component of the cemented carbide, and promotes elution of cobalt. The reality is that no oil has been developed that can prevent this. The present invention has been made in view of the above points, and provides a water-soluble cutting and grinding oil for cemented carbide that can suppress elution of cobalt during cutting using a cemented carbide tool and grinding on a cemented carbide material. The purpose is to provide

0004

[Means for Solving the Problems] As a result of intensive research into the relationship between the elution of cobalt, which is a component of cemented carbide, and the components of cutting and grinding fluids, the present inventors have found that by containing a specific amine, cobalt can be reduced. The present invention was completed based on the knowledge that elution can be suppressed. That is, the water-soluble cutting and grinding oil for cemented carbide of the present invention (hereinafter simply referred to as the present cutting and grinding oil) has general formulas (I) to (IV
) and diisopropanolamine. As the amine represented by the general formula (I),
N,N-dimethylethanolamine, N,N-diethylethanolamine, N,N-dibutylethanolamine, N,N-dimethylpropanolamine, N,N-dipropylethanolamine, N,N-diethylpropanolamine, N , N-dipropylpropanolamine, N
, N-dibutylpropanolamine, etc. Further, examples of the amine represented by the general formula (II) include 3-hydroxypropylamine and 2-methyl 2-propanol. Furthermore, as the amine represented by the general formula (III), N-hydroxyethylcyclohexylamine, N-hydroxypropylcyclohexylamine, N,N-dihydroxyethylcyclohexylamine, N,N-dihydroxypropylcyclohexylamine, N,N- -Hydroxyethyl-hydroxypropylhexylamine and the like. In addition, as the amine represented by general formula (IV),
Examples include N,N-dihydroxyethylaniline and N,N-dihydroxypropylaniline. The content of the amine is preferably in the range of 2 to 50% by weight (hereinafter referred to as "%") based on the entire oil agent. This is because if it is less than 2%, the concentration when diluting the oil agent will be low and the ability to prevent cobalt elution will be poor, whereas if it exceeds 50%, the pH of the diluted oil agent will become too high, causing operational problems such as dermatitis.

In addition to the above-mentioned amines, the oil agent of the present invention includes conventional cutting and grinding oils such as various carboxylic acids, surfactants, mineral oils, extreme pressure additives, inorganic salts, antifoaming agents, preservatives, and anticorrosive agents. Those used in can be added as appropriate. Here, various carboxylic acids include caprylic acid, capric acid, lauric acid, oleic acid, stearic acid, behenic acid, adipic acid, dodecanedioic acid, C22 dioic acid, and the like. In addition, as surfactants, anionic surfactants such as the above-mentioned amine fatty acid amine soaps, petroleum sulfonates, sulfated oils, polyhydric alcohol fatty acid esters (sorbitan fatty acid ester, polyoxyethylene sorbitan fatty acid ester, polyglycerin fatty acid ester) , propylene glycol fatty acid ester, polyoxyethylene glycol fatty acid ester, polyoxyethylene glycerin fatty acid ester, etc.), polyoxyethylene alkyl ether, polyoxyethylene alkyl phenyl ether, long chain alkyl sulfate, synthetic sulfonate (alkanesulfonate, aryl sulfonate, Examples include nonionic surfactants such as alkylaryl sulfonates, petroleum sulfonates, and fatty acid alkylolamides. Furthermore, as mineral oil, spindle oil,
Examples include machine oil, cylinder oil, turbine oil, mineral bright stock, etc. In addition, as extreme pressure additives, chlorinated extreme pressure additives such as chlorinated paraffin, chlorinated diphenyl, chlorinated naphthalene, chlorinated fatty acid, chlorinated fatty oil, sulfurized oil, sulfurized olefin, dibenzyl disulfide, dodecyl Examples include sulfur-based extreme pressure additives such as disulfide, diphenyl disulfide, saturated fatty acid sulfide, dialkyldithiocarbamic acid-metal compounds, and phosphorus-based extreme pressure additives such as phosphorous esters and phosphoric esters. In addition, examples of inorganic salts include phosphates, borates, and the like.

[0006]

[Examples] The present invention will be specifically explained below with reference to Examples and Comparative Examples. ■Test Example 1 In this test example, the cobalt dissolution properties of various amines were tested. First, 5 g of carbide grinding powder was added to 100 ml of a 0.4% aqueous solution of various sample amines shown in Tables 1 and 2, and after shaking at 30° C. for 72 hours, the liquid was filtered (No.
The appearance of the filtrate (using 5A filter paper) was observed and cobalt ions were measured. Note that cobalt ions were measured by atomic absorption spectrometry. The above results are shown in Tables 1 and 2 along with their evaluation. In addition, sample No. in Table 1
．． 1 is N,N-dimethylethanolamine, and No. 1 is N,N-dimethylethanolamine. 2
is N,N-diethylethanolamine, the same No. 3 is N
, N-dibutylethanolamine, No. No. 4 is diisopropanolamine, and No. 4 is diisopropanolamine. No. 5 is dimethylisopropanolamine, and No. 5 is dimethylisopropanolamine. 6 is 3-hydroxypropylamine, and No. 6 is 3-hydroxypropylamine. 7 shows the case where 2-amino 2 methylpropanol was used as the sample amine. Also, the same No. 8
is N,N-dihydroxyethylcyclohexylamine,
Same No. 9 is cyclohexylamine, and No. 9 is cyclohexylamine. 10 is N-hydroxyethylcyclohexylamine, the same No.
No. 11 is N,N-dihydroxypropylcyclohexylamine; No. 11 is N,N-dihydroxypropylcyclohexylamine; 12 shows the case where N,N-dihydroxyethylaniline was used as the sample amine. Furthermore,
Sample No. in Table 2. No. 13 is monoethanolamine, and No. 13 is monoethanolamine. No. 14 is diethanolamine, and No. 14 is diethanolamine. No. 15 is triethanolamine, and No. 15 is triethanolamine. No. 16 is monoisopropanolamine, and No. 16 is monoisopropanolamine. No. 17 is triisopropanolamine, and No. 17 is triisopropanolamine. No. 18 is methyldiethanolamine, and No. 18 is methyldiethanolamine. No. 19 shows the case where methylethanolamine was used as the sample amine. Table 1 also shows the results when water was used instead of the sample amine.

[0007]

[Table 1]

[Table 2] Sample No. of Table 1. In the case of 1 to 12, sample No. of Table 2
．． Compared to Nos. 13 to 19, the amount of cobalt extracted is reduced to less than half. In particular, when using N,N-dimethylethanolamine (Sample No. 1) and dimethylisopropanolamine (Sample No. 5) as sample amines, when using conventionally used monoethanolamine etc. Approximately 1/14 of sample No. 13 to 15)
The amount has been greatly reduced to 1/95. Particularly good results were also shown when sample amines represented by the general formulas (III) and (IV) were used (sample Nos. 8 to 11 and 12).

(1) Test Example 2 In this test example, the effect of suppressing cobalt elution of N,N-dihydroxyethylcyclohexylamine was tested in comparison with triethanolamine. First, Table 3 and Table 4
As shown in Figure 1, 0.4% sample amine and carboxylic acid (or carboxylic acid and surfactant) were dissolved and decomposed in water.
Add 5g of carbide grinding powder to 00ml and heat to 72°C at 30°C.
After shaking for a period of time, the liquid was filtered (using No. 5A filter paper), and the appearance of the filtrate was observed and cobalt ions were measured. In this test example as well, cobalt ions were measured by atomic absorption spectrometry. The results are shown in Tables 3 and 4. Further, in the same table, surfactant A means petroleum sulfonate (sodium salt), and surfactant B means polyoxyethylene oleyl alcohol (7 moles of EO added). Furthermore, the amounts of the various carboxylic acids in Tables 3 and 4 are as follows:
In both cases, it is 0.15% when the entire oil agent is taken as 100. Furthermore, the amounts of surfactants A and B added were both 0.20% when the entire oil agent was taken as 100.

[Table 3]

[Table 4] Sample No. of Table 3. 21 to 29, sample No. 21 in Table 4 is used. Compared to cases of 32 to 39, the amount of cobalt eluted is
It has decreased to about 1/12 to 1/52. This is due to the effect of N,N-dihydroxyethylcyclohexylamine used as the sample amine. In addition, when a surfactant is added in addition to carboxylic acid (No. 30
~31) also showed a good cobalt elution suppressing effect.

(1) Test Example 3 In this test example, N,N-dihydroxyethylcyclohexylamine was used as a sample amine to investigate the relationship between the concentration of an oil agent and the effect of suppressing cobalt elution. First, N
, 30 parts by weight of N-dihydroxyethylcyclohexylamine, 10 parts by weight of caprylic acid, and 60 parts by weight of water, and 100 ml of each diluted solution obtained by diluting this stock solution to various ratios shown in Table 5 were prepared. Next, 5g of carbide grinding powder was added to these and heated at 30℃ for 7 hours.
After shaking for 2 hours, the liquid was filtered (using No. 5A filter paper), and the appearance of the filtrate was observed and cobalt ions were measured. In this test example as well, cobalt ions were measured by atomic absorption spectrometry. This result is shown in Table 5.
Shown below. Table 5 also shows the results when water was used instead of the sample amine.

[Table 5] According to Table 5, even when diluted 50 times, it has almost the same performance as the original solution. Furthermore, when diluted up to 200 times, satisfactory results are shown although there is a slight decrease in performance. Thereafter, as the dilution rate increased, the results approached those obtained when water was used instead of the sample amine. From the above, within the range of dilution ratios up to about 200 times, the same cobalt elution suppression effect as when using the undiluted solution can be expected, but it does not cause work-related problems such as dermatitis that tend to occur when using the undiluted solution. No worries. It should be noted that the present invention is not limited to what is shown in the above-mentioned specific examples;
Various modifications may be made within the scope of the present invention depending on the application. That is, in this example, the test was conducted using one type of sample amine, but similar results can be obtained even if two or more types of sample amines from among the amines mentioned in the present invention are used.

0010

As described above, the water-soluble cutting fluid for cemented carbide of the present invention has the ability to suppress the elution of cobalt, which is a component of cemented carbide. Therefore, the surface of the cemented carbide tool and the cemented carbide material can be protected, and the efficiency of cutting can be improved.
It becomes possible to improve work efficiency.

Claims (1)

[Claims] 1. A water-soluble cutting and grinding tool for cemented carbide, characterized by containing one or more amines selected from the group consisting of general formulas (I) to (IV) of Chemical Formula 1 and diisopropanolamine. Oil agent for use. [Chemical formula 1] However, R1 and R2 are alkyl groups having 1 to 4 carbon atoms, R3 is an ethylene group or a propylene group, and R4
is a propylene group or a butylene group, and R5 and R6 are hydrogen, a hydroxyethyl group or a hydroxypropyl group.