Patent ID: 7723276

Claim:
A method for cutting and grinding a workpiece by minimal quantity lubrication system, comprising: cutting and grinding using a first oil for the cutting and grinding, said first oil consisting of a first ester which is an ester of at least one polyhydric alcohol selected from neopentyl glycol, trimethylolethane, and trimethylolpropane, and at least one monobasic acid selected from fatty acids having 2 to 24 carbon atoms, and optionally at least one additive selected from phosphorus compounds, sulfur compounds, antioxidants, oiliness improvers, metal passivators and extreme pressure additives with the exception of the phosphorus compounds and the sulfur compounds, wherein the content of said first ester is 30% to 100% by mass based on the total amount of said first oil, and sliding surfaces using a second oil for the sliding surfaces, said second oil consisting of a second ester which is the same ester as said first ester, and optionally at least one additive selected from phosphorus compounds, sulfur compounds, antioxidants, oiliness improvers, metal deactivators and extreme pressure additives with the exception of the phosphorus compounds and the sulfur compounds, wherein the content of said second ester being 30% to 100% by mass based on the total amount of said second oil, wherein the phosphorus compounds used for the first oil are compounds selected from the group consisting of phosphate ester, acid phosphate ester, acid phosphate ester amine salt, chlorinated phosphate ester, phosphite ester, and phosphorothionate; wherein the phosphorus compounds used for the second oil are compounds selected from the group consisting of phosphate ester, acid phosphate ester, acid phosphate ester amine salt, chlorinated phosphate ester, phosphite ester, and phosphorothionate; and wherein the first oil and the second oil are the same oil.