Metal tools and implements – making – Blank or process – Drill
Patent
1997-02-28
1998-12-08
Watts, Douglas D.
Metal tools and implements, making
Blank or process
Drill
761011, 76DIG11, 1754201, 419 38, B21K 504
Patent
active
058455477
ABSTRACT:
An excavating tool has a tungsten carbide insert which is more wear resistant and not subject to breakage because of being too brittle. The insert has a semispherical tip, a divergent midsection and a base with a conical rear surface. The insert is made with tungsten carbide particles sized between 1 and 8 microns and averaging between 2 and 5 microns, blended with particles of a binder of which the binder comprises 5.5 to 6.5 percent of the blend by weight, and the insert is sintered to a hardness of 89.5 R.sub.a or more.
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The Sollami Company
Watts Douglas D.
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