Multi-Edge Working Surfaces for Polycrystalline Diamond Cutting Elements
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United States of America Patent
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app pub date -
Feb 27, 2008
filing date -
Oct 23, 2004
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Abstract
A polycrystalline diamond cutting element for earth boring drill bits presents at least three regions of different abrasion resistance to the earthen formation when in operation. The cutting element has an end working surface and the regions, which are substantially free of catalyzing material, form a series of at least three layers. In operation, these layers wear at different rates causing a series of protruding lips. The end working surface may be substantially planar or frusto-conical in form.
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