金属材料の被削性に関する研究 : 組織と切削機構の関連性

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タイトル別名
  • A Study of Machinability of Metals : Effect of Microstructure of Materials on Cutting Mechanism
  • キンゾク ザイリョウ ノ ヒサクセイ ニ カンスル ケンキュウ

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抄録

Cutting mechanism of materials accompanying strain-hardening was analysed on the basis of the flow region concept. The effect of microstructure of materials on machinability of carbon steels (S15C, S40C, and SK4) was investigated from the viewpoint of chip formation. The effect of microstructure of materials on the cutting force, the location and the size of the flow region, the mean friction angle on the tool face, the conventional shear angle were discussed. The effects of feed and side rake angle on cutting process were also discussed. It was found out that inclination of the starting boundary line of the flow region was almost constant, and inclination of the end boundary line and the size of the flow region showed a maximum value at the lamellar portion of pearlite of 20 to 30%. Shear stress in the flow region and the conventional shear stress showed a tendency to decrease with an increase in the lamellar portion of pearlite.

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