Sandak Jakub, Goli Giacomo, Cetera Paola, Sandak Anna, Cavalli Alberto, Todaro Luigi
CNR IVALSA, San Michele all'Adige (TN), 38010, Italy.
University of Primorska, Faculty of Mathematics, Natural Sciences and Information Technology, Glagoljaška 8, 6000 Koper, Slovenia.
Materials (Basel). 2017 Jan 28;10(2):121. doi: 10.3390/ma10020121.
The influence of the thermal modification process on wood machinability was investigated with four minor species of low economic importance. A set of representative experimental samples was machined to the form of disks with sharp and dull tools. The resulting surface quality was visually evaluated by a team of experts according to the American standard procedure ASTM D-1666-87. The objective quantification of the surface quality was also done by means of a three dimensions (3D) surface scanner for the whole range of grain orientations. Visual assessment and 3D surface analysis showed a good agreement in terms of conclusions. The best quality of the wood surface was obtained when machining thermally modified samples. The positive effect of the material modification was apparent when cutting deodar cedar, black pine and black poplar in unfavorable conditions (i.e., against the grain). The difference was much smaller for an easy-machinability specie such as Italian alder. The use of dull tools resulted in the worst surface quality. Thermal modification has shown a very positive effect when machining with dull tools, leading to a relevant increment of the final surface smoothness.
采用四种经济价值较低的次要木材品种，研究了热改性工艺对木材可加工性的影响。将一组具有代表性的实验样品用锋利和钝的刀具加工成圆盘形状。由一组专家根据美国标准程序ASTM D - 1666 - 87对所得表面质量进行视觉评估。还通过三维（3D）表面扫描仪对整个纹理方向范围进行表面质量的客观量化。视觉评估和3D表面分析在结论方面显示出良好的一致性。加工热改性样品时，木材表面质量最佳。在不利条件下（即逆纹理）切割喜马拉雅雪松、黑松和黑杨时，材料改性的积极效果明显。对于像意大利桤木这样易于加工的树种，差异要小得多。使用钝刀具会导致最差的表面质量。在使用钝刀具加工时，热改性显示出非常积极的效果，使最终表面光洁度有显著提高。
