Uncoated cutting tool using brazed-in superhard blank

An uncoated cutting tool comprising:

• a body, the body containing a pocket;
• a polycrystalline cubic boron nitride blank, the blank being brazed into the pocket using a braze alloy;
• the braze alloy having a liquidus temperature of at least about 940 degrees Centigrade, and the braze alloy comprises gold and nickel, and the gold being present in an amount ranging between about 65 weight percent and about 90 weight percent, and the nickel being present in an amount ranging between about 15 weight percent and about 25 weight percent.

An uncoated cutting tool comprising:

• a body, the body containing a pocket;
• a polycrystalline cubic boron nitride blank, the blank being brazed into the pocket using a braze alloy;
• the braze alloy having a liquidus temperature of at least about 900 degrees Centigrade, and the braze alloy comprises silver, copper and titanium, and the silver being present in an amount ranging between about 65 weight percent and about 75 weight percent, the copper being present in an amount ranging between about 20 weight percent and about 30 weight percent, and the titanium being present in an amount ranging between about 2 weight percent and about 6 weight percent.

A method of removing material in a threading operation from a workpiece comprising a ferrous alloy having a hardness between about 50 Rockwell C and about 65 Rockwell C using an uncoated cutting tool, the process comprising:

• providing an uncoated cutting tool having body containing a pocket where a superhard blank is brazed using a braze alloy into the pocket to form a braze joint wherein the braze alloy having a liquidus temperature of at least about 900 degrees Centigrade wherein the braze alloy is selected from the group comprising a nickel-gold braze alloy containing nickel and gold, a copper-gold braze alloy containing copper and gold, a gold-copper-nickel braze alloy contains gold and copper and nickel, a silver-titanium-copper braze alloy containing silver and titanium and copper, and a silver-palladium braze alloy containing silver and palladium;
• and
• engaging the workpiece with the uncoated cutting tool on multiple passes wherein each pass removes a volume of material substantially equal to or less than the volume of material removed from the workpiece in the previous pass.