Dual-edge working surfaces for polycrystalline diamond cutting elements
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United States of America Patent
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Aug 4, 2009
Grant Date -
Jun 19, 2008
app pub date -
Feb 26, 2008
filing date -
Oct 23, 2004
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Abstract
A polycrystalline diamond cutting element for earth boring drill bits presents regions of different abrasion resistance to the earthen formation when in operation. The cutting element has an end working surface and a region which is substantially free of catalyzing material, forming a layer. In operation, this layer wears at a different rate than the underlying material causing a pair of protruding lips to form. The end working surface may be substantially planar or frusto-conical in form.
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