The coefficient of friction in metal cutting has been still left unknown to a large extent. This fact reveals rn4ny paradoxes, and also makes a bottle neck for further development both in theory and practice of metal cutting to some extent.
Recently some papers treating with this subject have been published, but they are mostly not more than theoretical considerations nor sufficient in experimental prooves.
In order to clarify the coefficient of friction, both tangential and normal forces or stresses on the rake face were obtained experimentally. In this case, of course, the tool-chip contact area was measured photomicrographically.
The results thus obtained tell that the coefficient of friction in metal cutting is quite different from the ordinary one of Coulomb's law. At rather slow cutting speeds the tangential component depends upon the contact area and the normal component is influenced by the conditions rather inside the work material near the cutting edge.
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