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

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In the veneer cutting process, the stress concentrations near the tool edge and the frictional coefficients on the tool that takes part in the mechanism of the veneer formation and the veneer quality become a serious problem of utmost importance, but few studies have dealt with this problem. The main purpose of this paper is to obtain several basic facts on the above-mentioned problem. 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, mentioned in the previous report. The factors affecting the veneer quality were discussed on the basis of the experimental results obtained and the results from the previous reports. The results obtained are summarized as follows : (1) As the tool-chip contact length (l_r) of the restricted tool decreases, when cutting watersaturated workpieces, the frictional force (F) acting on the tool decreases exponentially, but the normal force (N) does not change remarkably. When cutting air- dried workpieces, neither F nor N decrease even if l_r decreases (Fig. 1). (2) On the basis of the above-mentioned results, the frictional coefficients (μ) on the interface between the restricted tool and the chip decrease as l_r 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). (3) 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. 2-4).
長崎大学の論文
2003-06-30

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

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