Drilling tool fitted with self-sharpening cutting edges
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United States of America Patent
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Apr 12, 1994
Grant Date -
N/A
app pub date -
Mar 12, 1993
filing date -
Sep 14, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Self-shaping disk-shaped cutting edge of a drilling tool, comprising an outer diamond-impregnated polycrystalline layer (22) applied onto a tungsten carbide layer (24), each cutting edge being mounted on a support (18) which is integral with the body (12) of the drilling tool. The cutting edge and/or its support (18) have areas (26) of least resistance, such as grooves, which are likely to cause successive fractures, thereby forming an acute relief angle (.alpha.) with the rock to be drilled (28).
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