No abstract

A sound or a noise that accompanies wood machining processes is introduced by the tool rotation itself, by the friction of moving machine parts, or by wood-tool interaction. The sounds generated during machining with a circular saw could be analysed in order to monitor and possibly control the cutting process. Applying altered cutting parameters while cutting beech wood (Fagus sylvatica L.), which is the most common wood species in the Republic of Serbia, caused acoustic emissions that could be analysed throughout corresponding spectra. As shown in previous studies, altering the cutting parameters, e.g., the feed speed and tool override, resulted in variations in power consumption, surface roughness, and acoustic emission (or acoustic pressure). The aim of this paper was to provide a possible correlation between the applied cutting parameters and the acoustic emission spectra with respect to consumed power and the state of the machined surface. Along with acoustic emissions, the power consumption and surface roughness data were also acquired in order to make a possible relationship. By associating the idle circular saw acoustic spectra with background noise and comparing them with those obtained during machining, it was possible to indicate spectrum areas of particular interest for further analysis.

Šumarski fakultet, BeogradU ovom radu obrađen je postupak merenja snaga koje su se javljale tokom rezanja šest vrsta ploča iverica. Rezane su ploče iverice različitih fizičkih i mehaničkih svojstava kako bi se mogla naći određena korelacija sa snagama rezanja tj. kako bi se mogao odrediti uticaj vlažnosti, gustine i savojne čvrstoće ploča na snage rezanja. Merenje snaga rezanja izvršeno je u radionici Šumarskog fakulteta u Beogradu, merenje vlažnosti i gustine u laboratoriji za ispitivanje ploča iverica, a određivanje savojne čvrstoće izvršeno je u laboratoriji za ispitivanje svojstava drveta. Tokom rezanja menjane su brzine pomoćnog kretanja kako bi se odredio uticaj režima obrade na snagu rezanja. Generalno, došlo se do zaključka da sa povećanjem sadržaja vlažnosti predmeta obrade snaga rezanja opada, a sa povećanjem brzine pomaka, gustine i savojne čvrstoće ploče, potrebna snaga rezanja se povećava.