Measured strains in slow linear veneer cutting: Effects of nosebar form and gap
Measured strains in slow linear veneer cutting: Effects of nosebar form and gap
复制标题
慢速线性单板切割中测量的应变：鼻梁形状和间隙的影响
DOI：
10.1007/bf00364639
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发表时间：
1975
影响因子：
3.4
通讯作者：
H. Karpovich
中科院分区：
文献类型：
--
作者：
W. Mckenzie;H. Karpovich
对单板慢速直线切割过程中刀具和鼻梁附近的应变场进行了定量研究。0.01英寸的栅格。在试件的侧面印刷网目，并使用切割前和切割过程中拍摄的照片的测量来计算应变。鼻杆类型(单面、双面和滚柱)、鼻杆间隙和鼻杆润滑方式多种多样。这些作品是用再生红木(Sequoia Sempervirens Endl.)和人工种植的道格拉斯冷杉(Pseudotsuga menziesii(MIRB.)佛朗哥)。“最大主应变”判据似乎符合破裂的形成。单面鼻梁在减少刀刃最大主应变方面更有效，但在鼻梁边缘产生更大的主应变值，而滚筒鼻梁则相反。使用硅胶润滑脂的效果很小，总体来说是有利的。不均匀的工件质地增加了结果的可变性，但提供了一些关于在切割难处理树种的单板时控制剥落、压缩撕裂和鼻梁撕裂的一些见解。
A quantitative study was made of the strain field near the knife and nosebar in a slow linear veneer cutting. A grid of 0.01 in. mesh was printed on the side of the specimen, and measurements on photographs taken before and during cutting were used to calculate strains. Nosebar type (single-faced, double-faced and roller), nosebar gap, and nosebar lubrication were varied. The work-pieces were of regrowth redwood (Sequoia sempervirens Endl.) and plantationgrown douglas fir (Pseudotsuga menziesii (Mirb.) Franco). A “maximum principle strain” criterion appeared to accord with rupture formation. The single-faced nosebar was more effective in reducing maximum principle strain at the knife edge, but produced greater values of that parameter at the nosebar edge, while the roller nosebar had reverse effects. Lubrication with silicone grease had only small, generally favourable effects. Uneven texture of the work-pieces increased variability of results, but provided some insight into control of peeling checks, compression tearing and nosebar tear in cutting veneer from difficult species.