| 摘要 |
PROBLEM TO BE SOLVED: To maintain stable cutting quality and precision for the drill machining of a special hardly-cut material by applying thinning to the chisel section of a diamond-covered cemented carbide drill, forming a curvature at a corner section, and providing a negative land on a cutting edge. SOLUTION: A tungsten carbide base cemented carbide drill is used as a base material, and a diamond film is covered and formed by the vapor phase synthetic method, and the film is formed by the thermal filament CVD method. For the film forming condition, a thermal filament is kept at about 2000 deg.C, a drill substrate is kept at 900 deg.C, the film is formed for 30 hr in the environment of the gas composition of H2-1 vol.% CH2 at the pressure of 100 Torr, and the film thickness is set to 10μm. Thinning is applied to the chisel section of this diamond-covered drill, a curvature is applied to a corner section, and a negative land is provided on a cutting edge. Stable cutting quality and precision can be maintained for the drill machining of a special hardly-cut material such as a high-silicon aluminum.
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