Lubricating oil composition for machining tool
A lubricant composition for a machining tool, containing: a lubricating base oil; and based on a total amount of the composition, 0.05 to 5% by mass of a phosphoric acid ester represented by (R 1 O) 3 P═O: wherein R 1 represents any of an aryl group having 6 to 15 carbon atoms and a saturated hydrocarbon group having 1 to 20 carbon atoms, and each R 1 may be the same or different; 0.01 to 2% by mass of an acidic phosphoric acid ester represented by (R 2 O) n P(═O)(OH) (3-n) : wherein R 2 represents an alkyl group having 4 to 20 carbon atoms, n represents 1 or 2, and R 2 may be the same or different; and 0.5% by mass to 5% by mass of a sulfur compound.
1. A lubricant composition for a machining tool, containing:
lubricant base oil; and,
based on a total amount of the composition,
0.05 to 5% by mass of a phosphoric acid ester represented by the following general formula (1):
(R 1 0) 3 P═o (1)
wherein R 1 represents any of an aryl group having 6 to 15 carbon atoms and a saturated hydrocarbon group having 1 to 20 carbon atoms, and each R 1 may be the same or different;
0.01 to 2% by mass of an acidic phosphoric acid ester represented by the following general formula (2):
(R 2 O) n P(═O)(OH) (3-n) (2)
wherein R 2 represents an alkyl group having 4 to 20 carbon atoms, n represents 1 or 2, and each R 2 may be the same or different; and
0.5% by mass to 5% by mass of a sulfur compound.
2. The lubricant composition for a machining tool according to claim 1 , wherein R 2 in the general formula (2) represents an alkyl group having 8 carbon atoms.
3. The lubricant composition for a machining tool according to claim 1 , wherein R 1 in the general formula (1) represents a saturated hydrocarbon group having 1 to 20 carbon atoms.
4. The lubricant composition for a machining tool according to claim 1 , which simultaneously lubricates a slideway surface and a hydraulic pump of a machining tool.
5. A lubrication method comprising simultaneously lubricating a slideway surface and a hydraulic pump of a machining tool with the lubricant composition for a machining tool according to claim 1 .