RESEARCH OF PROPERTIES OF THE CUTTING TOOL RECEIVED BY POWDER METALLURGY

For providing the smallest costs of details production with the set operational properties in the conditions of modern machine-building production it is necessary to optimize machining processes where more than 70  % are occupied by processing with cutting. This problem can be solved by development and use of the modern tool materials with unique properties. The analysis of technological features of production of details in mechanical engineering, in particular power parts of gas-turbine engines, has shown the need to improve the quality of the machined surface of these parts and the efficiency of using modern, expensive equipment with numerical control systems and adaptive control systems providing a wide range of elements of the cutting regime, up to high-speed. To produce competitive products both on the domestic market and outside it, it is necessary to carry out a set of measures to optimize blade cutting, where the cutting tool is the weakest link in the process chain, which adversely affects both productivity and quality of the processed details. The work presents research results of wear features of the cutting tools manufactured by sintering of powders on the basis of quick-speed steel. It is shown that the powder tool materials on the basis of this steel additionally alloyed by titan carbide have high wear resistance and can be classified as a new class of the self-organized tool materials. The received results allow to draw a conclusion that it is expedient to carry out an additional alloying by two ways of impact: friction and wear. The first is an alloying by means of connection which allows to reach considerable decrease in level of self-organization as a result of reduction of friction coefficient at working temperatures. The second way is an alloying which gives the chance to expand a self-organization interval. It is reached by use of connections which cause transformations of secondary structures and increase of hardening coefficient. Application of both ways is followed by transition to friction with smaller effort and thermal loading that is confirmed by change in wear resistance and tribotechnical characteristics. The researches have shown that wear resistance of such tool is 2 – 3.5 times higher than wear resistance of ordinary tools from quick-speed steel.

wear resistance, self-organization at friction, tool materials, tribotechnical properties, secondary and ion mass spectrometry, Augerelectronic spectroscopy

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