small and deep hole's length to diameter ratio is greater than 8:1,under the effect of the cutting force the tool will easily be deformed, and will influence the process quality and efficiency. Especially to the hard Machining material’s deep hole drilling, there will be a lot of problems. The tool’s strength and the material limit traditional small and deep hole machining driller, the bits will easily be snapped, and the efficiency are low. In this paper we research the structure of the hard brittle materi...
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