単板剥ぎ取り機械に関する研究(XXVII) : 接触面積拘束工具による単板切削現象の一考察(2)

概要

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In this study, the normal and frictional tool force components were measured in the veneer cutting without a pressure bar, using the tool with the restricted tool - chip contact length. The factors affecting the veneer quality were discussed on the basis of the experimental results obtained. The results obtained are summarized as follows : (1) The frictional coefficients (μ) on the interface between the restricted tool and the chip decrease as the tool - chip contact length (l_r) of the restricted tool decreases. The decreasing tendency of μ is more remarkable when cutting water - saturated workpieces than when cutting air - dried ones. These phenomena can be explained qualitatively on the basis of the stress distributions over the rake face of the restricted tool (Fig. 2). (2) As l_r decreases, the degree of the stress concentrations near the tool edge increases remarkably. The increasing tendency of the normal stress concentration is more remarkable than that of the frictional stress concentration (Figs. 2-3). (3) As l_r decreases, the chip curvature and the knife check of the chip decrease (Figs. 4～5 and Photo. 2) and the surfaces of veneer produced become relatively good (Photo. 1).
長崎大学の論文
2004-06-30