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Research into he 'critical state' of rock cutting tools |
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Research into he 'critical state' of rock cutting tools JAROSLAV VASEK, JAN PINKA
Every year billions of cubic metres of intact rock forming the Earth’s crust are excavated in the
framework of mining and civil engineering activities, using various techniques of rock disintegration.
Without consideration given to rock disintegration using explosives, the application of mechanical rock
breaking technologies is in progress, being developed as a future technology allowing full mechanisation,
automation and robotics, likely to be applicable even in future space research programs. One of the oldest
rock disintegration technologies is based on the “cutting tool-rock” interaction. This technology has been
accompanying mankind from antiquity to present days. Yet it is still worth studying and improving. From
the very broad range of “tool-rock” problems, an analysis of the “tool-rock” interaction, determination of
rock resistance by means of measurements and assessment of rock workability and abrasiveness, defi nition
of an ideal speed and a critical state of a cutting tool, analyses of geometrical ratios of a conical bit during
rock disintegration, graphical representation of an ideal advance rate of a cutting machine, and evaluation
of a critical state of a cutting tool, this is the area covered by this paper, based on a theoretical solution
combined with experimental procedures.
Keywords: Rock cutting, cutting tool, interaction |
2011