Hard metal insert for a drill bit for percussion drilling and method for grinding a hard metal insert
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United States of America Patent
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Mar 22, 2016
Grant Date -
Feb 28, 2013
app pub date -
Oct 1, 2010
filing date -
Oct 5, 2009
priority date (Note) -
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Abstract
A hard metal insert for a drill bit for percussion drilling. A wear part includes a cap including a wear surface. A mount includes a cylindrical part having a cross-sectional area and a diameter. The cap includes a front part with an extension along an axis of symmetry of the insert from a first point on the wear surface to a second point in the cap. The front part includes a volume between a first plane intersecting the axis at the first point and a second plane intersecting the axis at the second point. The volume is ≧0.6 times a cross-sectional area of the front part in the second plane times a distance along the axis between the first and second points. A diameter of the front part in the second plane is ≧0.5 times the mount diameter and ≦0.6 times the mount diameter.
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