engleski

INFLUENCE OF DIFFERENT MACHINING ON THE SURFACE ROUGHNESS OF BEECH WOOD SAMPLES

The quality of machined surfaces is an important parameter for the quality of wood products. Especially, the surface roughness has an effect on bonding quality and surface treatment of wood products. This paper presents the research on the surface roughness of beech wood samples machined by two different processes and the influence of machining parameters on surface roughness. The samples with radial grain were planed and sanded in combination with milling. Tools for planing had four blades and feed rate was 10, 15, 20, 25, and 30 m·min-1. The depth of the planing was 1.00 mm and blade rake angle γ = 15°. The tool diameter was Φ = 125 mm and rotational frequency 8000 min-1. The other machining process was performed on the automatic milling and wide belt sanding machine with a head of milling tool with a diameter of Φ = 250 mm and sanding roller with P80 granulation. The rake angle of blades was γ = 15° and feed rate 10 m·min-1. The depth of milling and sanding was 1.50 mm. Surface roughness was measured using an electro-mechanical profiler Mitutoyo SJ-500. Measured parameters are Ra, Rz, and Rq, according to ISO 1997 standard. The lowest roughness had samples planed at a feed rate of 10 m·min-1. The differences between the obtained values of surface roughness are significant. The highest roughness had samples which were machined on automatic milling and widebelt sanding machine. Measured results showed that the surface roughness obtained by sanding closest corresponds to the roughness obtained by planing at a feed rate of 30 m·min- 1.

surface roughness, feed rate, planing, sanding, processing conditions

nije evidentirano