The analysis of the cutting area circuit diagram has shown that coatings on the edges of the hole and on the flank surface of the tool change the thermoelectric power measured by the dynamic thermocouple to the value of not more than 0.3-0.7%. So, only the composition and properties of the coatings will have an effect on the cut-ting temperature. Model theoretical temperature calculations according to the dependence proposed by the au-thors have shown that the temperatures are minimal when using single coatings ZrO2, TiN, AlN (for couples Т15К6 — St45), and ZrN, AlN, ZrO2, Al2O3 (for couples Т15К6 – 12H18N10Т). Experiments on turning St45 by carbide plates made of T15K6 have proved the efficiency of TiN+AlN coatings when the cutting temperature, chip shrink-age, and contact length on the front face (lc) are less than for the base alloy T15K6.
cutting temperature, thermoelectric power, cutting areas, wear-resistant coatings, contact processes
Введение. В практике металлообработки твердыми сплавами (ТС) с износостойкими покрытиями установлены факты стабильного повышения стойкости ТС пластин применением покрытий разных типов, однофазных и композиционных, содержащих TiC, TiN, TiCN, TiC+TiN, TiCN+TiAlN, TiN+TiAlN+TiZrN, TiN+AlTiN+AlCrN, AlCrN, TiN+Al2O3 и др. [1–7].
В опубликованных исследованиях установлены физико-механические причины влияния покрытий на износостойкость ТС для всех методов нанесения покрытия (газофазный и вакуумно-плазменный). В [8–9] были представлены известные механизмы прямого, косвенного и комбинированного влияния покрытий.
В настоящее время появились исследования влияния состава покрытий на прочностные характеристики и напряженное состояние твердых сплавов [7]. Изучен механизм влияния тонкослойных покрытий на торможение окислительно-диффузионного износа ТС [3, 5, 6, 10]. Подтверждается уменьшение сил резания и температуры при использовании некоторых композиционных покрытий [7].
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