| Summary: | <p>This article describes the results of studies on methods for improving the reliability of mechanical process operations of hard-to-machine materials. In serial production hard-to-machine materials processing should be characterized by high reliability, in particular, low dispersion tool life.</p><p>The aim is to analyze the reliability of a part of the technological system, i.e. the tool for mechanical processing of hard-to-machine materials.</p><p>The paper analyzes the effect of various input parameters of the technological system (processed material, tool material, technological environment), operating parameters (processing modes) on the reliability of the technological system. A feature of this work is to obtain quantitative characteristics of reliability for processing just the hard-to-machine materials. It is an important problem-solving because of the high cost of both the materials and the tool.</p><p>For various tool, processed materials, and process operation conditions the experiments have been conducted, and, when machining, the tool life has been recorded, thus allowing to obtain the coefficient of variation for high production run of tool. Comparison of coefficients of variation resulted in offering the tool material, process environment, and operation conditions to improve the reliability of the technological system for the specific brands of corrosion resistant steels and alloys and tungsten.</p><p>It is shown that the tool material and technological environment have the biggest influence on the tool life period T and its coefficient of variation varT. It is noted that materials with a complicated composition have the higher life volatility as compared with the resistance simple alloys. It is shown that an increasing cutting speed is reduced after a certain value of the coefficient of variation due to entrainment outgrowth formed on the cutting edge of the tool.</p><p>The results obtained allow machining production engineers at the enterprises of serial manufacturing to reduce the tool wear and increase the reliability of the mechanical process operations of hard-to-machine materials.</p>
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