木材切削工具の切れ味測定と切れ味評価(XXVII) : 木材切削における工具すくい面の切削応力分布および摩擦係数の変化に及ぼす被削材繊維傾斜角の影響(2)(東幹夫・尾崎洋二教授退官記念)

概要

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In the wood cutting process, it is important to obtain the actual stress distribution over the rake face during cutting and to investigate the changes of the stress distribution and the frictional coefficients depending on the workpiece conditions. In order to obtain quantitative information on them, the basic orthogonal cutting tests of wood were performed at 144.9 mm/min of cutting speed, using the conventional tool and the composite tool. The results obtained are summarized as follows : (1) The distributions of the normal stress (σ) and the frictional stress (τ) over the rake face can be expressed by Eq.(4), and the variations of the values of the exponents and the coefficients used in this equation with grain angle (φ_1) are illustrated in Figs. 4 and 5. (2) On the basis of the experimental results obtained in the wood cutting tests with the conventional tool and the composite tool, the cutting force ratios on the rake face near the tool edge to the total cutting force on the rake face can be calculated from Eq.(5), and these ratios are illustrated in Fig. 7. (3) The frictional coefficients (μ) on the rake face can be expressed by Eq.(7). On the rake face, μ can be considered to be constant, and the variations of μ with φ_1 are illustrated in Fig.8.
2004-03-26