ダイヤモンド被覆工具のCFRP切削における切削挙動解析

高島　英彰　　赤星　祐樹　　藤原　和崇　　高岡　秀充

Analyzing of Cutting Mechanism for CFRP Cutting by Diamond Coating Tools

Hideaki TAKASHIMA　　Yuki AKAHOSHI　　Kazutaka FUJIWARA　　Hidemitsu TAKAOKA

Abstract

Carbon fiber reinforced plastics (CFRP) has both superior mechanical properties and low weight. On the other hand, it is hard to cut CFRP without delamination and uncut-fiber, which easily occurred around machined surface due to the inhomo-geneous and anisotropic mechanical properties. In this work, we investigated cause of delamination and uncut-fiber by obser-vation the cutting edge of the diamond coating tools and machined surface of CFRP materials. The cutting edge of the tools kept smooth even after cutting, and tool wear increased with number of halls. However, there were some damages on machined surface of CFRP. Drilling tests with various sharpness of cutting edges were performed to investigate the relation-ship between sharpness of edges and delamination or uncut-fiber. The present results suggest that occurrence of damages like delamination or uncut-fiber depends on the sharpness of cutting edges and sharp edge is essential to suppress these damages.

キーワード：ダイヤモンド被覆工具，CFRP

1.　はじめに
　CFRPの切削加工において，加工品位の維持は重要である。加工品位が維持される目安として加工面にバリ（アンカットファイバー）および層間剥離が小さいこと，加工寸法精度の維持が挙げられる。ダイヤモンド被覆工具による CFRP切削において，加工品位が維持されない事象があった。本報は CFRP穴あけ加工後のダイヤモンド被覆ドリルの刃先および加工面を観察することにより，CFRPの切削現象を考察し，CFRP加工用ダイヤモンド被覆工具に適した刃先形態について検討した。

ものづくり・R&Dレビュー　第7号（2018）掲載

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