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Materials 2017, 10(2), 121; doi:10.3390/ma10020121

Machinability of Minor Wooden Species before and after Modification with Thermo-Vacuum Technology

1
CNR IVALSA, San Michele all’Adige (TN), 38010, Italy
2
University of Primorska, Faculty of Mathematics, Natural Sciences and Information Technology, Glagoljaška 8, 6000 Koper, Slovenia
3
GESAAF University of Florence, Firenze, 50145, Italy
4
SAFE University of Basilicata, Potenza, 58100, Italy
*
Author to whom correspondence should be addressed.
Academic Editor: Erik Reimhult
Received: 25 October 2016 / Revised: 18 January 2017 / Accepted: 23 January 2017 / Published: 28 January 2017
(This article belongs to the Section Manufacturing Processes and Systems)
View Full-Text   |   Download PDF [1785 KB, uploaded 6 February 2017]   |  

Abstract

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. View Full-Text
Keywords: machinability; wood; hygro-thermal modification; poplar; cedar; pine; alder; roughness; surface quality machinability; wood; hygro-thermal modification; poplar; cedar; pine; alder; roughness; surface quality
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MDPI and ACS Style

Sandak, J.; Goli, G.; Cetera, P.; Sandak, A.; Cavalli, A.; Todaro, L. Machinability of Minor Wooden Species before and after Modification with Thermo-Vacuum Technology. Materials 2017, 10, 121.

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