単板剥ぎ取り機械に関する研究(XXII) : 単板切削におけるナイフすくい面に働く摩擦挙動に及ぼすプレッシャバー作用の影響

概要

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In the present paper, the stress distribution and the frictional coefficient on the interface between the tool and the chip in the veneer cutting with the sharp bar were made clear, using the composite tool which was divided into two parts. The results obtained are summarized as follows : (1) The frictional coefficient (μ) in veneer cutting can be derived approximately from the frictional theory, as shown in Fig. 1 and expressed by Eqs.(1) ∿ (9), and be expressed by Eq.(10). (2) The frictional coefficient (μ) on the interface between the tool and the chip under the sharp bar compression can be considered to be constant. μ decreases as the depth of cut (t) increases, and is smaller with air-dried workpieces than with watersaturated ones. But μ is smaller in the veneer cutting with the sharp bar than without a pressure bar (Table 2). (3) As the horizontal opening (H) decreases, both normal stress (σ) and frictional stress (τ) increase, but the increasing tendency of σ is more remarkable than that of τ. On the basis of the change of these stress distributions with the change of H, μ can be considered to show a decreasing tendency as H decreases (Table 3).
長崎大学の論文
2002-06-28