Document Type : Research Paper
Authors
1 Wood and Paper Technology Department of Gorgan University of Agricultural Sciences and Natural Resources. Gorgan, Iran.
2 Wood and Paper Technology Department of Gorgan University of Agricultural Sciences and Natural Resources. Gorgan, Iran
Abstract
The aim of this study was to investigate the factors affecting surface quality of paulownia
wood during milling by advanced computer numerical control (CNC) machine. For this aim
wood logs were provided and were converted to proper sizes (2.5 x 10 x 15 cm) and then air
dried. The Variable of this study were spindle speed of machine (10000 and 18000 rpm),
feeding rate (6 and 12 m/min), cutting depth (1and 5 mm), cutting method (down and upmilling)
and cutting pattern (tangential and radial). Roughness of cut specimens edge were
evaluated by profilometer method according to ISO 13565 standard. For evaluation of surface
quality Abbott group parameters (Rpk, Rk, Rvk) were used. Degree of effective of the
parameters was evaluated by fractional factorial design as completely random design at
confidence level of 95%. The result showed that spindle speed, cutting method and feed rate are
influencing factors on surface quality of milled specimens and their effect was significant. With
increasing spindle speed and decreasing feeding rate the roughness decreased and surface
quality improved. In up-milling cutting method, degree of roughness was higher and
consequently surface quality was inferior. It is to be noted that cutting method in comparison to
other factors had the high influence on surface quality. The rest variable did now have
independent influence on surface quality at 95% Confidence level.
Keywords
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