鎖鋸による切削 (第2報)*
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概要
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This paper aims to report on the cutting characteristics in more details, in connection with our previous research which was made with the fixed single blade of a saw chain, imposing restriction on its rotation. (a) The variation of the cutting force is not rectilineal with the exception of its vertical component. As the amount of cutting increases, the cutting force value increases by degrees within the depth of approximately 0.8 millimeters, and then it gains a great deal but beyond 2.0 millimeters returns to a steady increase. The vertical force has a rectilineal variation, tending to decrease in proportion to depth. All this while, we observed some minus force working, and this may be the reason why the vertical force decreases. (b) The degree of the rake angle being lessened, the cutting force value increases gently attended with a lineal variation. In this case it must be considered that the change of the rake angle is brought about by the inclination of the blade itself, but that it has no effect on its tool angle. (c) The shape of the chips shows that the increasing amount of cutting and the lessening of the rake angle brings about a similar result in cutting wooden pieces. (d) The two-dimentional cutting by the top plate of a blade explains the fundamental cutting behaviour similar that of the standard cutting shown in (a).
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