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The possibility of increasing the durability of a cutting insert made of high-speed steel with a wear-resistant TiN coating due to the use of lubricating process media during the running-in period of the cutting tool is considered. Based on the analysis of the data obtained, an analogy in the mechanisms of the hardening action of the refrigerant and wear-resistant coatings is presented. It is shown that the durability of a metal-cutting tool substantially depends on the initial conditions of its operation.

The paper considers the influence of environmentally friendly coolant-lubricants on the temperature parameters of the cutting process during hole countersinking. Structural steel 20, corrosion-resistant steel 12X18N10T and titanium alloy VT1-0 were selected as the processed materials. Mineral oils, as well as environmentally friendly vegetable oils and esters based on them were used as coolant-lubricants. The coolant-lubricants feed was carried out using an environmentally oriented dosing unit, which allowed the lubricant to be sprayed into the cutting zone in portions of an aerosol, which provided greater penetration and reduced the liquid consumption. The study of the temperature state of the cutting process was carried out using an artificial, chromel-copel thermocouple, the junction of which was placed in the immediate vicinity of the cutting zone. The data obtained when using vegetable oils as a coolant-lubricant in operations running under conditions of pronounced adhesive wear indicate their competitiveness not only with mineral oils, but also with traditionally used oil coolant-lubricants.

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In laboratory conditions, the influence of lubricating and cooling process media of plant origin on power characteristics of the cutting process and quality of processed surfaces during countersinking of structural materials with different chemical activity has been established. The use of methyl esters of rapeseed and sunflower oils fed using a minimized supply of lubricant, in comparison with base oils and traditionally used lubricants, is shown to reduce the roughness of the treated surface and the unit cutting work.