| 摘要 |
PROBLEM TO BE SOLVED: To provide a throw-away tip involving less risk of peeling owing to a residual stress and having a long lifetime as the whole tool life by applying a sinter of superabrasive grains rigidly to each of the main surfaces of a tip base by means of simultaneous sintering and forming on each surface two or more apices to serve as cutting edges. SOLUTION: A work to be sintered in which a powder of superabrasive grains is arranged adjacent to the top surface and undersurface of a disc of cemented carbide is set in a high-temperature, high-pressure device, and subjected to a pressure-temperature condition in which the superabrasive substance is stabilized thermodynamically. The work collected after being cooled and having got rid of pressure is subjected to removal of a pressure medium etc. and the superabrasive grain surface is exposed, and after undergoing a coarse polishing and a mirror polishing, the work is subjected to a wire cut and a further polishing, and cut out in a multi-apex shape at the apices of each of the main surfaces. COPYRIGHT: (C)2006,JPO&NCIPI
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