炭素焼結体の被削性(第3報) : 工具損傷に及ぼす黒鉛化温度, バインダー量および2次粉砕粒度の影響

概要

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Various kinds of sintered carbons such as amorphous carbon, graphite, graphite and amorphous carbon etc. are utilized for various purposes. In addition, the production conditions such as graphitized temperature, mass fraction of binder, grain size etc are varied in compliance with numerous requests. However, the influences of production conditions on tool failure have not been made clear. In this paper, when turning two-phase carbons consisted of filler and binder and commercial products by cemented carbide tool K10,the influence of graphitized temperature, binder fraction, and grain size on the tool wear pattern and the tool life are examined. In the case of amorphous and graphite carbons treated at the temperature below 2000℃, no crater wear generates but the relief face severely wears. On the other hand, in the case of graphite treated at the temperature above 2500℃ a typical crater wear is observed in spite of the chips of crack type but flank wear rate is slower. The tool life is mutually related to thermal conductivity of sintered carbons. The generation of crater wear depends on the fact that the chips flow up along the rake face at a high speed.
1993-09-05