engleski

Effect of Feed Speed on Bluntness and Warming of Circular Saw in Sawing Beech and Oak Wood

The conditions of wood processing can have a serious effect on durability of the tool blade, frequency of tool replacement and consequently the production efficiency. Bluntness of the cutting blade is affected by many processing factors, the most important being the cutting speed, cutting direction, feed rate, cutting angle, tool material and workpiece material. The right choice of kinematic relations can help avoiding the development of high temperatures at the cutting blade. This paper presents the results of research of bluntness of tool blades in sawing by circular saw oak and beech wood samples with the moisture content of 8 to 12 %, at four feed speeds (2 ; 4 ; 6.5 and 13 m/min), after sawing of 100 m. By the use of infrared thermography during sawing under given conditions, the maximum temperature of the tool was measured and then analyzed in correlation with the measured tool bluntness. The largest blade radius of 15.95 μm was measured after sawing beech samples and the smallest blade radius of 7.73 μm was measured in sawing oak samples. Statistically significant difference of the blade radius after sawing oak and beech samples was obtained at the lowest and highest feed speed (2 m/min and 13 m/min). The radius of the main cutting blade is lowered with the increase of feed speed, which is in correlation with the measured maximum temperature of the tool in wood processing at different feed speeds. The maximum temperature of the tool in sawing beech samples was 239.3 °C, and in sawing oak samples 183.4 °C. The results of research have shown that tool wear can be monitored by measuring the temperature by infrared thermography, which enables timely replacement and sharpening of tools, as well as the choice of the optimum sawing conditions.

feed speed, blade bluntness, tool warming, IR thermography

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