WOOD RESEARCH Volume 61, Number 3, 2016
JOZEF KRILEK, Ján Kováč, Štefan Barcík, Ján Svoreň, Milan Štefánek, and Tomáš Kuvik

The influence of chosen factors of a circular saw blade on the noise level in the process of cross cutting wood

Research was focused on evaluation of a circular saw blade tooth spacing on maximum equivalent noise level LAeq in the process of cross cutting wood. There were used circular saw blades with uniform tooth spacing and a full body and non-uniform tooth spacing with dilatation gaps. The measurements were done on the measuring device which was designed at the Department of Environmental and Forest Technology where it has been modernised. For research, testing samples of three wood species i.e. spruce (Picea abies), pine (Pinus sylvestris) and beech (Fagus sylvatica) were used. In the cutting process, two feeding speeds were set up with the same revolutions of circular saw blades and for more precise statistical significance; every measurement was repeated several times. At the research, there was found out that the circular saw blade with uniform tooth spacing has lower equivalent noise level at smaller feeding speed and cutting soft wood species. The circular saw blade with non-uniform tooth spacing has lower equivalent noise level at higher feeding speed.

WOOD RESEARCH Volume 62, Number 3, 2017
Ján Svoreň, Ľubomír Javorek, Mária Krajčovičová, Katarína Klobušiaková, Ivan Kubovský, and Richard Kminiak

The effect of the circular saw blade body structure on the concentric distribution of the temperature along the radius during the wood cutting process

The paper presents the experimental results of a research aimed at the distribution of the temperature on thecircular saw blade body. The temperature was measured at four distances from the centre of the circular saw blade body (60 mm, 70 mm, 80 mm, 90 mm) by means of an infrared thermometer. Three circular saw blades with the diameter of 350 mm and a variable adjustment of the body (without slots and coating, with slots and without the coating, with both slots and coating) were used for the longitudinal sawing of the spruce wood (Picea excelsa) with the thickness of h = 25 mm. Feed speed vf = 12 m•min-1 and cutting revolutions n = 4000 min-1 were constant. The measured temperature was in the range from 22°C to 30°C. The highest measured temperatures were recorded on the circular saw blade with the slots and coating.

WOOD RESEARCH Volume 64, Number 3, 2019
Peter Koleda, Štefan Barcík, Ľubomír Naščák, Ján Svoreň, and Jaroslava Štefková

Cutting power during lengthwise milling of thermally modified oak wood

The paper presents experimental results of cutting power of thermally modified and non-modified hardwood of Summer oak (Quercus robur) during lengthwise milling. The process of heat treatment was performed in the atmosphere of superheated steam, at temperature 210ºC. Cutting power was determined during milling of the radial surface of modified and non-modified samples. It was calculated as the difference of power consumption by a milling machine during wood machining and at idling. Several cutting regimes were tested by combining different values of rotation speed, feed speed, rake angle and constant cutting depth ae = 1 mm. The values of cutting power are approximately the same at the kinematic angle of the tool head γ = 15°, 30°; there are bigger differences for γ = 20°. The decline of cutting power in the thermally modified (210°C) oak wood machining compared to natural oak wood is 21.7% ÷ 22.2% at the cutting speed vc =40 m. s-1.