単板剥ぎ取り機械に関する研究(XXIV) : 単板切削における切削現象の変化に及ぼす切削速度の影響

Abstract

Experimental works have been performed by many researchers on the effects of cutting velocity in the veneer cutting process, and it is known that these results are different. For instance, some results show practically no effect on cutting force, while others show a gradual increase or a gradual decrease with increase in cutting velocity (V). In the present experiment, veneer cutting tests were performed to obtain fundamental data on the effects of V on cutting force, frictional coefficient (μ), radius of veneer curvature (r) and knife check occurred in veneer by use of an experimental apparatus designed for cutting tests. The main results obtained are summarized as follows : (1) In the range of very low cutting velocity below about 5 m/sec, the frictional force (F) and the normal force (N) of cutting force decrease so remarkably with increase in V. In the range of V of about 5～12 m/sec, their forces are not affected by V. In the range of V of relatively high cutting velocity above about 12 m/sec, F is not affected by V, but N increases gradually with increase in V. (2) When cutting water-saturated workpieces μ is lower as compared with that when cutting air-dried workpieces, and when cutting not only water-saturated workpieces but also air-dried workpieces μ decreases gradually with increase in V. (3) The radius r increases but knife checks occurred in veneer decreases with increase in V.