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木材のThick-Slicingにおけるプレッシャバーの影響 : 被削材の変形,工具切れ刃面に加わる切削抵抗およびプレッシャバー接触面に加わる圧縮力の変化


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Title: 木材のThick-Slicingにおけるプレッシャバーの影響 : 被削材の変形,工具切れ刃面に加わる切削抵抗およびプレッシャバー接触面に加わる圧縮力の変化
Other Titles: Effects of Pressure Bar upon Deflections in Workpiece, Cutting Force Components acting on Cutting Tool Face and Compressive Force Components acting on Pressure Bar Face in Orthogonal Thick-Slicing of Wood
Authors: 杉山, 滋
Authors (alternative): Sugiyama, Shigeru
Issue Date: 28-Feb-1981
Publisher: 長崎大学教育学部
Citation: 長崎大学教育学部自然科学研究報告. vol.32, p.145-167; 1981
Abstract: In the wood thick-slicing process, the compressive force acting on the pressure bar face and the compressive deflections caused in wood play important roles, but few studies have dealt with the exact measurements of the deflections, and so, the main objective of this paper is to obtain several basic information on them. The clear specimens the end grain surface to which were applied thin sensitive films printed grid patterns, were prepared. After being soused in water up to saturated condition, they were set on the experimental apparatus equipped with two 2-axis dynamometers (Fig.1). Then, these test specimens were compressed or rolled out by two types of pressure bars in both stationary and feeding state of the feeding carriage. The distributions of the deflections in the specimens were determined from the moiré fringe pattern or the distortion pattern of grid line. Furthermore, in order to determine the effects of pressure bar compression and restraint in the thick-slicing process, cutting tests were carried out on the experimental apparatus, using a roller bar and a single faced nosebar (sharp bar), and the cutting force components acting on the tool face and the compressive force components acting on the pressure bar face were measured with the two 2-axis dynanometers. The main results obtained are summarized as follows: (1) The vertical component of the compressive force acting on the bar face (Pv) varies largely with the combinations of horizontal distance (h) and vertical distance (v), whereas the horizontal component of the bar force (PH) varies slightly with h and v (Figs.11 and 12). (2)In slicing with a roller bar, Pv increases largely with decrease in h. Therefore, the tool edge deflection due to overcompression of bar occurs in the smaller range of h (Fig.10). (3) The distribution pattern of the deflection in the workpiece varies with the types of pressure bars applied, that is, in the case of sharp bar, the high strain concentrates at the loaded point and the distribution of the deflection is limited to a narrower area, but in the case of roller bar, the strain concentration diminishes and the distribution of the deflection spreads in a large area (Photos.1~4). (4) Surfaces of the sliced veneer produced with a roller bar are well smoother than those with a sharp bar (Photos. 5 and 6). (5) From these results, it may be concluded that the major factors affecting the quality of the thick-sliced veneer are not only the bar restraint which is determined by the combinations of such factors as h, v, depth of cut (t), cutting angle (θ) and roller diameter of roller bar (D) but also the contact area between the bar face and the workpiece surface.
URI: http://hdl.handle.net/10069/32648
ISSN: 0386443X
Type: Departmental Bulletin Paper
Text Version: publisher
Appears in Collections:No. 32

Citable URI : http://hdl.handle.net/10069/32648

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