Machinability of Nodular Cast Irons : Part I, Tool Forces and Flank Adhesion

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  • ノジュラー鋳鉄の被削性 : 第1報, 切削力と工具逃げ面における凝着現象
  • ノジュラー チュウテツ ノ ヒサクセイ 1

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Abstract

Three grades of nodular cast iron (60, 80, and 100) were tested to determine the cutting force and net horsepower required to machine the materials, to determine the performance of several grades of carbide and ceramic cutting tools, and to investigate the flank adhesion phenomenon. Cutting force required to machine 80 and 100 grades decreased smoothly with an increase in cutting speed. It was found that the effect of feed rate on cutting force was larger than that of depth of cut. When grade 60 was machined with carbide tools, flank adhesion was encountered with accompanying sharp increases in cutting force values at speeds above a critical cutting speed. This critical cutting speed and the increase in cutting force decreased as the titanium content of the cutting tool increased. No flank build-up occurred with ceramic tools. This phenomenon was explained by the oxide film theory.

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