Patent ID: 7381016
Filing Date: 2008-06-03
Classification: B23B,B23K,B23P,C23C,Y10T

Abstract:
1. An uncoated cutting tool for removing material from a workpiece in a material removal operation, the uncoated cutting tool comprising: a body, the body containing a pocket; a superhard blank having a rake surface and a cutting edge, the blank being brazed into the pocket using a braze alloy whereby there is a braze joint between the body and the blank, and wherein the superhard blank is a polycrystalline material blank comprising either polycrystalline cubic boron nitride blank or polycrystalline diamond blank; the braze alloy having a liquidus temperature, and the braze alloy comprises gold and one or more of copper and nickel; the superhard blank engaging the workpiece during the material removal operation so that cutting forces are exerted on the superhard blank and heat is generated at the cutting of the superhard blank; the braze joint being located a selected distance away from the cutting edge so that the temperature at the braze joint is less than the liquidus temperature of the braze alloy whereby the braze joint has sufficient shear strength to retain the superhard blank in the rocket during the material removal operation; and wherein the braze alloy comprises about 50 weight percent gold and about 50 weight percent copper.