JPH08333594A - Casting mold lubricant - Google Patents

Abstract

PURPOSE: To obtain a casting mold lubricant having excellent lubricity in warm or hot casting process, excellent in processability, mold releasability, storage stability, etc, by dispersing a highly basic alkaline earth metal organic acid salt to a base oil in a specific ratio. CONSTITUTION: (B) A highly basic alkaline earth metal organic acid salt (preferably at least two kinds of a highly basic alkaline earth metal phenolate, carboxylate and sulfonate) is dispersed in (A) a basic oil (preferably a mineral oil, a synthetic oil, an oil and a fat, a synthetic ester, etc.). The basic oil has a basicity of >=4mg/KOH/g, preferably >=150mg/KOH/g. Preferably an extreme pressure additive having a frictional coefficient-reducing effect (preferably di-2- methyl-1-propyldithiophosphoric acid ainc salt, ainc naphthenate, calcium naphthenate, di tertiary dodecylpolysulfide) is preferably further added.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to carbon steel, alloy steel,
Non-ferrous metal warm (200 to 800 ℃) and hot (900 to 1300 ℃)
The present invention relates to a forging die lubricant that exhibits excellent lubricity in forging, prevents seizure of steel material on the tool surface and wear of the tool, and facilitates machining and demolding. The present invention is particularly useful as an alternative to graphite type lubricants for the purpose of improving the working environment.

[0002]

2. Description of the Related Art Conventionally, when a forging process is performed, a mold lubricant supplied to the work surface is mainly one in which graphite is dispersed in oil or water. However, since any type of lubricant has a black appearance, contamination of the work environment is a serious problem. The present inventors previously found a non-graphite type lubricating oil in which a carbohydrate and / or a carbohydrate derivative, a film enhancer and a dispersant were dispersed in a base oil as a non-graphite type lubricating agent and applied for a patent (patented Kaihei 6-256784 publication). However, this lubricating oil has a lubricity equal to or better than that of a graphite-based oil-dispersion type lubricant, but since the solid content is dispersed in the base oil, depending on the operating environment, the base oil and solid In some cases, the particles separated and the usage conditions were slightly limited.

[0003]

The object of the present invention is to prevent the work environment from being contaminated in the warm and hot forging processes as in the case of the conventional graphite oil dispersion type lubricants, and moreover, the graphite oil. It is an object of the present invention to provide a forging die lubricant which has lubricity and releasability equal to or higher than those of the dispersion type lubricant, has good storage stability, and can extend the tool life.

[0004]

As a result of intensive studies to solve the above problems, the present inventors have found that a highly basic alkaline earth metal organic acid salt is effective, and completed the present invention. Came to do. The present invention is a lubricant in which a highly basic alkaline earth metal organic acid salt is dispersed in a base oil, the base value of which is 40 mgKOH / g or more, and a forging die lubricant. . Examples of the highly basic alkaline earth metal organic acid salt used in the present invention include highly basic alkaline earth metal phenates, highly basic alkaline earth metal carboxylates, highly basic alkaline earth metal sulfonates, and these A mixture of two or more kinds may be mentioned, but the present invention is not limited thereto.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Examples of alkaline earth metals include calcium, magnesium and barium. The same effect can be obtained by using any of these, but calcium is preferable from the viewpoint of economy. Therefore, in this specification, the highly basic alkaline earth metal organic acid salt will be described below as the highly basic calcium phenate, the highly basic calcium carboxylate and the highly basic calcium sulfonate, but the present invention is not limited thereto. It is not something that will be done. The overbased calcium phenate can be produced, for example, as follows. That is, a predetermined solvent (for example, aromatic hydrocarbon such as benzene or toluene, alcohol solvent such as methanol or ethanol, mineral oil) substituted with a linear or branched hydrocarbon group having 1 to 40 carbon atoms, or Add sulfurized phenol and excess calcium hydroxide and mix. Then, carbon dioxide gas sufficient to carbonate the added calcium hydroxide is passed through, and then distilled under reduced pressure to remove the volatile solvent. The overbased calcium phenate produced by this method contains excess Ca
It is a transparent liquid in which CO ₃ is stably dispersed. Commercially available products are ADX-410J from Adibis and Olonite Japan.
Examples include OLOA229 and OLOA218A.

The overbased calcium carboxylate is
For example, it can be manufactured as follows. That is, an organic carboxylic acid and excess calcium hydroxide are added to and mixed with a predetermined solvent (for example, aromatic hydrocarbon such as benzene and toluene, alcohol solvent such as methanol and ethanol, mineral oil). Then, carbon dioxide gas sufficient to carbonate the added calcium hydroxide is passed through, and then distilled under reduced pressure to remove the volatile solvent. The highly basic calcium carboxylate produced by this method is a transparent liquid in which excess CaCO ₃ is stably dispersed, and its active ingredient can be represented by the following general formula. [R ¹ -COO-Ca-OOC-R ² ] n · (CaCO ₃ ) m In the formula, R ¹ and R ² may be the same or different, and have 1 carbon atom.
To 40 straight or branched chain aliphatic hydrocarbon group, C4 to C40 cyclic aliphatic hydrocarbon group substituted with an aliphatic group, and C7 to C40 aromatic carbon group substituted with an aliphatic group Indicates a hydrogen group. m / n is 0.2 or more, preferably 15 or more. As commercially available products, LUBRIZOL 5341, 53 from LUBRIZOL
41A etc. are mentioned.

Highly basic alkaline earth metal sulfonate,
For example, the overbased calcium sulfonate can be produced, for example, as follows. That is, an organic sulfonic acid and excess calcium hydroxide are added to and mixed with a predetermined solvent (for example, aromatic hydrocarbon such as benzene and toluene, alcohol solvent such as methanol and ethanol, mineral oil). Then, it is produced by passing carbon dioxide gas sufficient for carbonating the added calcium hydroxide and then distilling under reduced pressure to remove the volatile solvent. The overbased calcium sulfonate produced by this method contains excess CaCO ₃
Is a transparent liquid in which is dispersed stably, and the active ingredient thereof can be represented by the following general formula. [R ¹ -SO ₃ -Ca-O ₃ SR ² ] n · (CaCO ₃ ) m In the formula, R ¹ and R ² may be the same or different, and have 1 carbon atom.
To 40 straight or branched chain aliphatic hydrocarbon groups, aliphatic group-substituted cycloaliphatic hydrocarbon groups having 4 to 40 carbon atoms, and aliphatic group-substituted aromatic hydrocarbon groups having 7 to 40 carbon atoms Indicates a group. m / n is 0.2 or more, preferably 15 or more. As commercial products, LUBRIZOL 5347 and Wi
BRYTON C-150, C-400, C-500, etc. from tco are mentioned.

In JP-A-5-306397, JP-A-6-200282 and JP-A-7-3279, it is possible to use highly basic calcium phenate and highly basic calcium sulfonate for hot rolling. Although described, it is not known for use in forging die lubricants. In the case of rolling, rolling-sliding lubrication is used, and the friction coefficient at the time of working is currently in the range of 0.15 to 0.25, and even if the friction coefficient is too small, it cannot be processed. In addition, the lubricant is supplied by cooling the roll surface with a large amount of cooling water after rolling, removing the cooling water, and then supplying the lubricant. Therefore, the roll surface temperature is 100 ℃
Since it is supplied to the place where the temperature becomes below, there is no problem that the lubricant is hard to adhere to the roll surface depending on the temperature.

On the other hand, the warm and hot forging processes are
It is a sliding lubrication process. The new surface produced by working is up to about 50 times that of rolling, and it is desirable that the coefficient of friction be as small as possible. In addition, the mold surface temperature during processing is 300 to 50 when the oil type forging die lubricant is used.
It has reached 0 ° C. Therefore, it is clear that the required performances required for the lubricants for hot rolling and forging are different.

The forging die lubricant of the present invention is required to have an average base number of the composition as a whole of 40 mgKOH / g or more, preferably 70 mgKOH / g or more, more preferably 15 mgKOH / g or more.
It is desirable to be 0 mgKOH / g or more. If the average base number of the entire composition is less than 40 mgKOH / g, the intended effect of the present invention cannot be achieved. Base number is JIS K 2501
Is defined as the total base number in 1 g, and refers to the mg number of potassium hydroxide equivalent to hydrochloric acid required to neutralize all the base components contained in 1 g of a sample. Therefore, overbased calcium phenate, overbased calcium carboxylate,
Overbased calcium sulfonate is a basic component Ca
The higher the CO ₃ content, the higher the base number.

The above-mentioned commercially available overbased calcium phenate, overbased calcium carboxylate and overbased calcium sulfonate usually contain a base oil. Therefore, these can be used as they are as the forging die lubricant of the present invention. Alternatively, it may be diluted with an appropriate base oil before use. It should be noted that since the highly basic calcium phenate, the highly basic calcium carboxylate, and the highly basic calcium sulfonate can obtain almost the same effect, any of them can be used at any mixing ratio. The above-mentioned commercially available overbased calcium phenate, overbased calcium carboxylate, and overbased calcium sulfonate preferably have a base number of 40 mgKOH / g or more. When these are used as a mixture of two or more kinds, the base value average value obtained from each mixing ratio is 40
It is preferably at least mgKOH / g. That is, the base number is 40
When using less than mgKOH / g, it is sufficient if the average value of the base number is 40 mgKOH / g or more by mixing with the one with high base number. Alternatively, a substance having a base number of less than 40 mgKOH / g may be used to lower the base number.

Examples of the base oil of the forging die lubricant of the present invention include mineral oils, synthetic oils, fats and oils, and synthetic esters of one kind or a mixture of two or more kinds. Specific examples include medium and heavy mineral oils such as spindle oil, machine oil, dynamo oil, motor oil, cylinder oil and bright stock oil;
Animal and vegetable oils and fats such as beef tallow, lard, whale oil, palm oil, coconut oil, rapeseed oil, rice bran oil and soybean oil; esters of fatty acids having 8 to 22 carbon atoms and monohydric and polyhydric alcohols, α-
Synthetic oils such as olefins, polybutenes, silicone oils and fluorine oils; and mixed oils thereof.

In addition to the above base oil, a sufficient effect can be obtained by adding an extreme pressure additive or a solid lubricant having a friction coefficient reducing effect to the lubricant of the present invention. The extreme pressure additive that can be used in the present invention is one or two of the following.
It is possible to select and use one or more species. Metal salt of dialkyldithiocarbamic acid (alkyl group: C _{2 to} C ₈ ),
Diaryldithiocarbamic acid metal salt, 2-mercaptobenzothiazole metal salt, isopropylxanthogenic acid metal salt, dialkyldithiophosphoric acid metal salt (alkyl group: C
₂ -C _8), diaryl dithiophosphate metal salts, naphthenic acid metal salts, straight-chain or branched aliphatic carboxylic acid metal salt, di-tertiary dodecyl polysulfide, sulfurized fats, powdered sulfur, the reaction product of dialkyltin fatty acids, dialkyltin Reaction product of mercaptocarboxylic acid ester with alkyl tin sulfide, potassium borate oil dispersion (for example, manufactured by ORONITE ADDITIVES: trade name: OLOA975
0), calcium borate oil dispersion, and mixtures thereof. Examples of the metal of the metal salt include calcium, zinc, molybdenum and the like.

In order to further prevent contamination of the working environment, which is the object of the present invention, it is preferable from the viewpoint of refraining from adding solids (indicating powder and particles, excluding ultrafine particles) to the base oil as much as possible. Is zinc di-2-methyl-1-propyldithiophosphate, zinc naphthenate, calcium naphthenate, zinc linear or branched aliphatic monocarboxylic acid having 6 to 22 carbon atoms,
A linear or branched aliphatic monocarboxylic acid calcium salt having 6 to 22 carbon atoms, ditertiary decyl polysulfide,
Potassium borate oil dispersion, as well as mixtures thereof. Further, as the solid lubricant, graphite, MoS ₂ , W
In addition to S ₂ , white or light-colored solid lubricants described in Lubricating Glossary (edited by Japan Society of Lubrication) and coating enhancers described in JP-A-6-256784 are used. be able to. The content of the extreme pressure additive or the solid lubricant having the effect of reducing the friction coefficient is preferably 2 to 40% by weight, more preferably 5 to 20% by weight in the forging die lubricant of the present invention. is there. The forging die lubricant of the present invention can be supplied to the die by a gear pump, a plunger pump or the like generally used as a lubricant pump. Moreover, you may apply with a brush, without using a pump.

[0015]

EXAMPLES The present invention will be described with reference to Examples and Comparative Examples. Examples 1 to 40, Comparative Examples 3 and 4 Production was carried out using a stainless steel heating pot equipped with a stirrer.
One or two or more of high basic calcium phenate, high basic calcium carboxylate and high basic calcium sulfonate, and one or two kinds of mineral oil, synthetic oil, oil and fat, and synthetic ester. The above is shown in Table 1.
The weight ratios shown in Nos. 2 and 2 were put into a kettle and stirred at 50 to 60 ° C. until uniform. Comparative Example 2 The components shown in Table 2 were put into a kettle to form a slurry, and then the mixture was passed through a Monton Gorin homogenizer at 350 kgf / cm ^{2 for} 2 passes to obtain a lubricant of Comparative Example 2. For comparison of the lubricants obtained in the above Examples and Comparative Examples and for further comparison, a commercially available graphite oil dispersion type lubricant (Comparative Example 1) was subjected to a performance test by the following test method, and the obtained results are shown in Table 1. It is also described in 1 and 2. Examples 41 to 50 As in Example 1, one or more of overbased calcium phenate, overbased calcium carboxylate, and overbased calcium sulfonate, and mineral oil,
One or two or more kinds of synthetic oil, fat and oil, and synthetic ester are put in a kettle at a weight ratio shown in Table 3, and an extreme pressure additive having a friction coefficient reducing effect is further added at 50 to 60 ° C. The lubricant was prepared by stirring until uniform.
The results are also shown in Table 3.

1. Formability: Backward extrusion test Using a small forging machine, forging is performed under the following conditions, and the load (ton) during processing, the thickness of the bottom of the workpiece (mm (hereinafter referred to as the bottom thickness)) and the presence or absence of seizure Judges forging formability.The smaller the load and the bottom thickness, the better as there is no seizure. (Test conditions) Forging machine: 160 ton mechanical press Mold: Punch diameter 25 mmφ, Die inner diameter 30 mmφ Test piece: S45C (Diameter 30mm, Thickness 16mm) Specimen temperature: 1200 ℃ Machining speed: 32.5mm / sec Area reduction ratio: 70% Bottom thickness setting: The bottom thickness of the cup machined with the sample of Comparative Example 2 is about 2.35mm To

(Evaluation) Formability: Corresponding to Comparative Example 2, bottom thickness 2.35 mm or less, load 44t
Being below. Presence / absence of seizure: The seizure state of the die after the hot forging test was observed and evaluated according to the following 5 grades. (□ to ◎ is evaluated as good) ◎: No image sticking is observed ○: Image sticking is hardly observed □: Image sticking is slightly observed Δ: Image sticking is recognized ×: Image sticking is noticeable

2. High temperature adhesiveness Set a test piece assuming a mold to a specified temperature and drop 0.1 ml with a syringe to check the maximum temperature that can be attached. (Evaluation) Good: Adhesion occurs even at 500 ° C. or higher. Δ: 450 ° C. or more and less than 500 ° C. X: less than 450 ° C. 3. Contamination around the equipment Excessively supplied lubricant adheres to the black around the equipment (especially graphite-containing oil), or the adhered lubricant is polymerized and cannot be easily removed even if an attempt is made to remove it with a spatula, etc.
Check the work environment for contamination. (Evaluation) ○: No contamination ×: Contamination

[0019]

Since the lubricant of the present invention does not use a black component such as graphite, the working environment is improved, and the forge formability and other performances are improved in graphite oil dispersion type lubricants (Comparative Example 1 and Comparative Example 1). It is shown to be equal to or higher than 2). Therefore, it was confirmed here that the lubricant of the present invention was a lubricant for improving the working environment in place of the graphite-based forging lubricant.

[0020]

[Table 1] Table 1 ───────────────────────────────── Lubricant composition Example weight% 1 2 3 4 5 6 7 8 (1) 100 − − − − − − − (2) − − − − − − − − (3) − 100 − − − − − − (4) − − − − − − − − ( 5) − − 100 − − − − − (6) − − − 100 − − − − (7) − − − − 100 − − − (8) − − − − − 100 − − (9) − − − − − − 100 − (10) − − − − − − − 100 (11) − − − − − − − − (12) − − − − − − − − (13) − − − − − − − − Base number Average value 150 400 45 150 400 500 125 400 (mgKOH / g) Evaluation Forging test Bottom thickness mm 2.16 2.10 2.27 2.17 2.10 2.07 2.18 2.09 Load t 33 29 38 33 29 27 34 29 Seizure ◎ ◎ ◎ ◎ ◎ ◎ ○ ◎ High temperature adhesion sex (℃) ○ ○ ○ ○ ○ ○ ○ ○ equipment Side of the pollution ○ ○ ○ ○ ○ ○ ○ ○

(1) Highly basic calcium phenate (base number 150) (OLOA 218A: manufactured by OLONITE ADDITIVES) (2) Highly basic calcium phenate (base number 250) (TNC
-350: Texaco Chemical Co.) (3) Highly basic calcium phenate (base number 400) (ADX
-410J: Adibis) (4) Basic calcium sulfonate (base number 25) (BRYT
ON C-45: Witco) (5) Highly basic calcium sulfonate (base number 45)
(A mixture of (4) 94.7% and (7) 5.3%) (6) Highly basic calcium sulfonate (base number 150) (B
RYTON C-150: Witco (7) Highly basic calcium sulfonate (base number 400) (B
RYTON C-400: Witco (8) Highly basic calcium sulfonate (base number 500) (B
RYTON C-500: manufactured by Witco) (9) Highly basic calcium carboxylate (base number 12
5) (LUBRIZOL 5341A: manufactured by Lubrizol) (10) Highly basic calcium carboxylate (base number 40
0) (LUBRIZOL 5341: manufactured by Lubrizol) (11) Mineral oil A (ISO VG 46) (12) Trimethylolpropane oleic acid full ester (13) Rapeseed oil

[0022]

[Table 2] Table 1 (continued) ───────────────────────────────── Lubricant composition Example wt% 9 10 11 12 13 14 15 16 (1) − − − − 50 50 − 34 (2) − − − − − − − − (3) 50 50 − 34 − − − − (4) − − − − − − − − (5) − − − − − − − − (6) − − − − 50 − 50 33 (7) 50 − 50 33 − − − − (8) − − − − − − − − (9) − − − − − 45.4 45.4 30 (10) − 50 50 33 − 4.6 4.6 3 (11) − − − − − − − − (12) − − − − − − − − (13) − − − − − − − - salt group value average 400 400 400 400 150 150 150 150 (mgKOH / g) evaluation forging test bottom thickness mm 2.10 2.09 2.10 2.10 2.16 2.17 2.17 2.17 load t 30 30 29 30 34 33 33 33 burn ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ High temperature adhesion (℃) ○ ○ ○ ○ ○ ○ ○ ○ Contamination around the equipment Dyeing ○ ○ ○ ○ ○ ○ ○ ○

[0023]

[Table 3] Table 1 (continued) ───────────────────────────────── Lubricant composition Example wt% 17 18 19 20 21 22 23 24 (1) 53 − − − − − − − (2) − − − − − − − − (3) − 16 − − 50 50 50 − (4) − − − − − − − − (5) 47 84 47 47 − − − − (6) − − − − − − − − (7) − − 53 − − − − 50 (8) − − − − − − − − (9) − − − − − − − − (10) − − − 53 − − − − (11) − − − − 50 − − 50 (12) − − − − − 50 − − (13) − − − − − − 50 − Average base number 101 101 101 101 200 200 200 200 (mgKOH / g) Evaluation Forging test Bottom thickness mm 2.20 2.20 2.21 2.21 2.13 2.13 2.13 2.13 Load t 34 33 34 34 32 31 32 31 Burn-in ○ ○ ○ ○ ◎ ◎ ◎ ◎ ◎ high temperature adhesion (℃) ○ ○ ○ ○ ○ ○ ○ ○ of peripheral equipment fouling ○ ○ ○ ○ ○ ○ ○ ○

[0024]

[Table 4] Table 1 (continued) ───────────────────────────────── Lubricant composition Example Weight% 25 26 27 28 29 30 31 32 (1) − − − − 50 − 25 27 (2) − − − − − − − − (3) − 25 25 − − − − − (4) − − − − − − − − (5) − − − − − − − 23 (6) − − − − − 50 25 − (7) − 25 − 25 − − − − (8) − − − − − − − − (9) − − − − − − − − (10) 50 − 25 25 − − − − (11) 50 50 50 50 50 50 50 50 (12) − − − − − − − − (13) − − − − − − − − Average base number 200 200 200 200 75 75 75 50.5 (mgKOH / g) Evaluation Forging test Bottom thickness mm 2.13 2.12 2.13 2.12 2.22 2.23 2.22 2.24 Load t 32 32 32 31 36 35 35 37 Burn-in ◎ ◎ ◎ ◎ ○ ○ ○ □ High temperature adhesion (℃) ○ ○ ○ ○ ○ ○ ○ ○ Contamination around equipment ○ ○ ○ ○ ○ ○ ○ ○

[0025]

[Table 5] Table 1 (continued) ───────────────────────────────── Lubricant composition Example wt% 33 34 35 36 37 38 39 40 (1) − − − − 30 − 15 − (2) − − − − − − − − (3) − − 30 − − − − 20 (4) − − − − − − − − (5) 23 15 − − − − − − (6) 27 − − − − 30 15 − (7) − − − 30 − − − 20 (8) − − − − − − − − (9) − 35 − − − − − − (10) − − − − − − − 20 (11) 50 50 70 70 70 70 70 40 (12) − − − − − − − − (13) − − − − − − − − Average base number 50.5 50.5 120 120 45 45 45 240 (mgKOH / g) Evaluation Forging test Bottom thickness mm 2.24 2.24 2.15 2.16 2.27 2.27 2.28 2.11 Load t 36 37 32 33 38 39 38 30 Burn-in □ □ ○ ○ □ □ □ □ ◎ high temperature adhesion (℃) ○ ○ △ △ △ △ △ ○ facilities around the pollution ○ ○ ○ ○ ○ ○ ○

[0026]

[Table 6] Table 2 ───────────────────────────────── Lubricant composition Comparative example Weight% 1 2 3 4 5 6 (1) − − 20 − − − (2) − − − − − − (3) − − − − − − (4) − − − 30 − 100 (5) − − − − − − (6 ) − − − − − − (7) − − − − − − (8) − − − − − − (9) − − − − − − (10) − − − − − − (11) − 70 80 70 100- Graphite (particle size 5μ) -30 ----- Base number average value --30 7.5 0 25 (mgKOH / g) Evaluation Forging test Bottom thickness mm 2.27 2.35 2.28 2.39 2.48 2.32 Load t 38 44 39 45 49 41 Burn-in ◎ □ △ △ × △ △ High temperature adhesion (℃) ○ △ △ △ × △ Contamination around equipment × × ○ ○ ○ ○ Comparative Example 1 Commercial graphite oil dispersion type lubricant (100%)

[0027]

[Table 7] Table 3 ─────────────────────────────────── Lubricant composition Example Weight% 41 42 43 44 45 46 47 48 49 50 (21) 40 80 80 − 80 − 80 − − 80 (22) − − − 80 − 80 − 80 − − (23) − − − − − − − − 80 − (24) 55 − − − − − − − − − (25) − 10 10 10 10 10 10 10 10 10 (26) 5 10 − − − − − − − − (27) − − 10 10 − − − − − − ( 28) − − − − 10 − − − − − (29) − − − − − 10 − − − − (30) − − − − − − 10 10 − − (31) − − − − − − − − 10 10 (32) 160 320 320 320 320 320 320 320 320 320 320 Formability Bottom thickness mm 2.13 2.08 2.10 2.10 2.09 2.11 2.09 2.10 2.10 2.10 Load t 32 27 29 29 28 30 28 29 30 29 Burn-in ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ High temperature adhesion ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ (33) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ (21) Highly basic calcium phenate (base number 400) (ADX-410J: Adibis) (22) Highly basic calcium sulfonate (base number 400) (BRYTON C-400: Witco) ( 23) Highly basic calcium carboxylate (base number 400) (LUBRIZOL 5341: manufactured by Lubrizol) (24) Mineral oil A (ISO VG 46) (25) Mineral oil B (ISO VG 460) (26) Di-2-methyl- Zinc 1-propyldithiophosphate (27) Calcium naphthenate (28) Zinc 2-ethylhexylate (29) Zinc stearate (30) Ditertiary decyl polysulfide (20% sulfur content) (31) Potassium borate dispersion (particle size 0 .1 μm) (32) Average base number of composition (mgKOH / g) (33) Contamination around equipment

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display area C10N 10:04 20:00 30:00 30:06 30:08 40:24

Claims (11)

[Claims] 1. A lubricant obtained by dispersing a highly basic alkaline earth metal organic acid salt in a base oil, the base number of which is 40 mg.
Lubricant for forging, characterized by KOH / g or more. 2. The forging die lubricant according to claim 1, wherein the highly basic alkaline earth metal organic acid salt is a highly basic alkaline earth metal phenate. 3. The forging die lubricant according to claim 1, wherein the highly basic alkaline earth metal organic acid salt is a highly basic alkaline earth metal carboxylate. 4. The forging die lubricant according to claim 1, wherein the highly basic alkaline earth metal organic acid salt is a highly basic alkaline earth metal sulfonate. 5. A lubricant comprising a base oil and a mixture of at least two kinds of a highly basic alkaline earth metal phenate, a highly basic alkaline earth metal carboxylate and a highly basic alkaline earth metal sulfonate dispersed therein. A forging die lubricant having a base number of 40 mgKOH / g or more. 6. The forging die lubricant according to claim 1, which is for hot forging. 7. The forging die lubricant according to claim 1, which is for warm forging. 8. The forging die lubricant according to claim 1, wherein the base oil is selected from the group consisting of mineral oils, synthetic oils, fats and oils, synthetic esters, and mixtures of two or more thereof. . 9. The forging die lubricant according to claim 1, which has a base number of 150 mgKOH / g or more. 10. The forging die lubricant according to claim 1, further comprising an extreme pressure additive having a friction coefficient reducing effect. 11. The extreme pressure additive is di-2-methyl-1-
Zinc propyldithiophosphate, zinc naphthenate, calcium naphthenate, zinc straight-chain or branched aliphatic monocarboxylic acid having 6 to 22 carbon atoms, straight-chain or branched aliphatic monocarboxylic acid calcium salt having 6 to 22 carbon atoms, and ditershade decyl The forging die lubricant according to claim 10, which is a polysulfide, a potassium borate oil dispersion, or a mixture thereof.