ダイヤモンドコーティング工具による過共晶 Al-24%Si 合金の切削

概要

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Diamond coated cutting tool has been expected to the candidate for a cutting tool for hard materials. In this paper, cutting of hypereutectic Al-24%Si alloy by using diamond coated cutting tools have been examined, and evaluation of the tool has been conducted. Two types of cutting tools are fabricated by depositing diamond films on sintered diamond surfaces, and hot-pressed Si_3N_4 surfaces with microwave plasma chemical vapor deposition method. Cutting of Al-24%Si alloy is done by using these cutting tools. When diamond coated Si_3N_4 cutting tool is used, exfoliation of a diamond film occurs under the small cutting depth of 0.2 mm. On the other hand, when diamond coated sintered diamond cutting tool is used, neither exfoliation nor wear of a diamond film is observed. These results show the latter cutting tool is strong enough to be applied to the cutting tool for Al-24%Si alloy. Furthermore, coating processes of diamond films deposited on Si_3N_4 and sintered diamond are discussed. A diamond film grows epitaxially on diamond crystals at sintered diamond surfaces, whereas a diamond film is formed on amorphous carbon above Si_3N_4 substrate. This shows the reason why the diamond coated sintered diamond cutting tool has much larger resistant ability in comparison with a diamond coated Si_3N_4 cutting tool.
公益社団法人精密工学会の論文
1990-12-05