Method of making cutting tool inserts with high demands on dimensional accuracy
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United States of America Patent
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Aug 20, 2013
Grant Date -
Oct 6, 2011
app pub date -
Dec 9, 2009
filing date -
Dec 10, 2008
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Abstract
A method of making cutting tool inserts with high demands on dimensional accuracy includes:
- mixing by milling of powders forming hard constituents and binder phase,forming the powder mixture to bodies of desired shape,sintering the formed bodies,grinding with high accuracy the sintered bodies to inserts with desired shape and dimension,optionally edge rounding of cutting edges, andproviding the ground inserts with a wear resistant non-diamond or non-diamond-like coating. According to the method, the ground inserts are heat treated prior to the coating operation in an inert atmosphere or vacuum or other protective atmosphere below the solidus of the binder phase for such a time that the micro structure of the surface region is restructured without causing significant dimensional changes. In this way inserts with unexpected improvement of tool life and dimensional accuracy have been achieved.
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