| 摘要 |
PROBLEM TO BE SOLVED: To provide a long diamond drill as a precision cutting tool used in the boring technique of minimum diameter, capable of forming a deep bore of minimum diameter of above 10 mm onto a hard material difficult in working such as a hard metal material, a silicon monocrystalline material and a ceramics material. SOLUTION: A diamond powder green compact is laminated on a green compact base material of a hard metal material, and treated under high temperature and high pressure to manufacture a hard metal integrally sintered- polycrystalline diamond board, and the board is cut in lattice as the cutting-out work of the material from the obtained integrally sintered-board in a state that the board is cut in the thickness direction with an arbitrary inclination angle ofθ=30 deg.-85 deg. in the cutter inserting direction in one of the X.Y axial direction of at least the polycrystalline sintered-diamond board surface, whereby obtaining a long diamond drill shaped-blank having a pair of cutting faces opposite to each other and completing the top solid diamond drill by using this long rod-shaped worked blank material.
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