球状黒鉛鋳鉄の超高速切削における被削性について

抄録

  This study was carried out to examine the machinability of spheroidal graphite cast iron by high speed and super-high speed machining at 1,000 m/min degree under the following conditions; depth of cut, 0.5 mm; feed, 0.05 mm/rev; tool, sintered hard metal or ceramic.
  The cutting resistance in the super-high speed machining of spheroidal graphite cast iron considerably decreased because the decrease of cutting resistance with increased cutting speed was considerable in case of the spheroidal graphite cast iron although it was small in the case of negative rake angle such as −5°. Also flank adhesion phenomenon disappeared under this cutting speed. Flank adhesion phenomenon occured under cutting speed of 300-600 m/min when using sintered hard metal tool. It was considered that adhesion in spheroidal graphite cast iron is caused by the coexistence of ferrite and graphite, which graphite produces very fine chips during machining.
  The life of sintered hard metal tool was very short in super-high speed machining, while that of the ceramic tool was much longer than that of the sintered hard metal tool, though its life was inferior compared to the case of grey cast iron machining. Flank adhesion did not occur with the ceramic tool. Finished surface improved with the super-high speed machining, though the case of the ceramic tool was inferior to the case of the sintered hard metal tool.