ダイヤモンド原石の色のバイト摩耗への影響

概要

論文の詳細を見る
Even for diamond tool, the tool wear increases with cutting distance after on diamond turning of an Al-Mg alloy. According to diamond tool manufacturers, it is said that brown diamonds are stronger and tougher than yellow ones. It has not been made clear, however, what coloured diamond is preferable for cutting tools. On the other hand, Ikawa has reported that microfracture strength can be estimated by IR absorption coefficient on diamond crystals. In this paper, the correlation between the colour of diamond and the tool wear was examined on turning experiments of an Al-Mg alloy. Yellow, light yellow, white, light brown and brown crystals of natural diamond were tested as cutting tools. These tools have same crystallographic orientation and same ratio, RA, of IR absorption coefficient a_1 at wave length λ = 7.3 μm relative to the value a_2 atλ= 7.8μm. The following results were obtained. (1) Microfracture strength on the brown tools is approximately 1.2 times larger than that on the yellow tools, according to the estimation with a_1 and a_2 measured. The wear rates of both cutting tools are, however, almost same in the stationary state after some primary tool wear. (2) The surface roughness using the brown tools can not be distinguished from that using the yellow tools at any cutting distance.
公益社団法人精密工学会の論文
1989-09-05