WOOD RESEARCH Volume 62, Number 5, 2017
Tomáš Kuvik, JOZEF KRILEK, Ján Kováč, Milan Štefánek, and Jiří Dvořák

Impact of the selected factors on the cutting force when using a chainsaw

The paper deals with the calculation and analysis of cutting force and input power when crosscut sawing with a chainsaw. For obtaining and evaluating the results, we have used empirical relationships and the values of appropriate coefficients given by the literature. After the evaluation we have gained the theoretical knowledge of the impact of a tree species and its moisture on cutting force intensity and input power. Tree species have a strong influence on cutting force; the harder the tree species is, the greater cutting force is required. Input cutting power is calculated from the cutting force that is why the impact of a tree species on input power is as big as on cutting force. It has been confirmed that the cutting force and cutting input power are affected by wood moisture content, as well.

WOOD RESEARCH Volume 62, Number 4, 2017
Inácio Lhate, Luís Cristóvão, and Mats Ekevad

Machining properties of lesser used wood species from Mozambique

The present study was aiming at measuring cutting forces for wood of lesser used species from Mozambique such as Acacia nigrescens Oliv (namuno), Pericopsis angolensis Meeweven (muanga), Pseudolachnostylis maprounaefolia Pax (ntholo) and Sterculia appendiculata K. Schum (metil). Another aim was to use an expeditious method to compare performance of the species when cut. A machinability index calculated using Digraph and Matrix Methods was used for ranking the performance of the species when cut. Two different cutting tools 20o and 30o rake angle were used. Main cutting force in 90°-90° and 90°-0°cutting directions were measured by piezoelectric gauge. The results of the experiments showed that cutting forces followed normal trends to increase with density and decrease with increasing rake angle. The ratio between wood density and cutting forces in cutting directions 90°-90° and 90°-0° were 7 s2m-4 and 17.3 s2m-4, respectively. The most difficult species to be machined was Namuno, whereas the easiest species to be machined was Metil.

WOOD RESEARCH Volume 65, Number 2, 2020
Yang Chunmei, Liu Qingwei, Jiang Ting, Song Mingliang, Ma Yan, and Liu Jiuqing

Test analysis and verification of the influence of milling cutter blade shape on wood milling

In this paper, the influence law of cutting tools with different blade shapes in the process of wood milling was studied. Keeping the cutting speed, cutting depth, cutting width unchanged, the blade shapes of milling cutter were the research object, the cutting force, cutting vibration, and chip morphology change under different feed rate were discussed, the surface roughness of the processed material was analyzed under down milling and up milling. The results showed that when the feed rate increased from 6 m.min-1 to 14 m.min-1, the cutting force in up milling was less than that in downing milling, the cutting vibration of upright milling cutter with spiral curved blade was the smallest, it increased gradually in the range of 13.6 m.s-2 – 27.4 m.s-2 in up milling. On the whole, the surface roughness of the workpiece in down milling was better than that in up milling. The experimental study on the cutter milling blade shapes had a guiding significance for improving the precision of surface machining and provided a theoretical reference for the selection of process parameters in the milling process.

WOOD RESEARCH Volume 66, Number 1, 2021
Pavol Harvánek, Ján Kováč, and Ján Melicherčík

Analysis of cutting force in the process of chipless felling wood

This study compared the magnitude of the value of the cutting force using different tools with different thickness for different wood species with the same size. Measurements were made on wooden samples of spruce, aspen, and beech wood with dimensions 30 × 30 × 200 mm (w × d × h). The tearing machine pushed knives with dimension 150 × 100 mm and thicknesses of 4, 6, 8, and 10 mm with a 30° angle of cutting edge into the wood samples in a direction perpendicular to the fiber growth. Research shows that this angle of cutting edge is most effective for chipless cutting. The results were analysed by the Statistica 12 software. From the measurement results, for chipless wood felling is most preferred the 10 mm cutting knife thickness.