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1
Content available A brief review and comparison of selected experimental methods for measuring natural frequencies of circular saw blades
Kaczmarek A., Orlowski K. A., Javorek L.
Drewno : prace naukowe, doniesienia, komunikaty
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2016
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vol. 59, nr 197
231--239
EN
Different methods for the empirical determination of the natural frequencies of circular saw blades are presented. Stationary methods, such as the harmonic and impulse tests, are discussed and the results of related comparison are given. The comparison of the methods revealed their degree of practical usefulness and their accuracy in determining natural frequencies. A combination of specific methods is proposed, which should allow optimal results.
2
Content available New design of circular saw blade body and its influence on critical rotational speed
Droba A., Javorek L., Svoreň J., Paulíny D.
Drewno : prace naukowe, doniesienia, komunikaty
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2015
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vol. 58, nr 194
147--157
EN
Oscillation is an unwelcome state as it has adverse effects not only on the work piece but also on the tool. This paper deals with the problem of circular saw blade oscillation and the effect of modification of the circular saw blade body on the natural frequency as well as on the critical rotational speed. The calculation and experimental investigation of the natural frequencies and node shapes on two types of circular saw blades were carried out. Two methods used to determine the natural frequencies are presented: the first, modal analysis (FEM), a theoretical method, and the second, experimental measurement. The results of the investigation were used to compare the FEM and experimental methods and to show which modification achieved a higher critical rotational speed. Both methods were conducted on two circular saw blades for continual cutting with 36 teeth and slots.
3
Content available remote Badania procesu nagniatania tocznego drewna świerkowego
Orłowski K. A., Javorek L., Ľalik J., Przybylski W.
Mechanik
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2014
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R. 87, nr 11CD
201--210
PL
Przedstawiono wyniki badań eksperymentalnych nagniatania tocznego drewna świerkowego uprzednio toczonych powierzchni. Wałki z drewna świerkowego w pierwszym etapie były toczone za pomocą noża, specjalnej konstrukcji, z obrotową krawędzią skrawającą, a następnie były nagniatane na tokarce z zastosowaniem nagniataka rolkowego. Eksperymenty wykonano na różnych poziomach wartości posuwu, prędkości obrotowej i siły docisku. Przeprowadzone badania wykazały zmniejszenie wartości chropowatości powierzchni oraz zmniejszenie średnic przedmiotów, jako efekt wygładzenia powierzchni i jej zagęszczenia.
EN
Experimental results of spruce wood processing by roller burnishing are presented. The spruce shafts had been turned with the self-propelled turning tool of the special design, and afterwards have been burnished with a roller burnishing tool on a turning lathe. Experiments were carried out with variable a feed per revolution, number of revolutions and a burnishing force. In each case forces during the burnishing process were measured. Obtained results revealed that burnished surfaces of spruce round timbers are smoother than turned ones. in the case of the roller burnishing.
4
Content available remote Mode vibrations of plates – experimental analysis
Kaczmarek A., Javorek L., Orłowski K.
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
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2014
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No. 88
97--101
EN
Mode vibrations of plates - experimental analyses. In this paper results of the square MDF plate and circular saw blades examination with the use of the harmonic method to static identification of resonant frequencies and shapes of mode vibrations are presented. Obtained results reveled that for circular saws with large holes in a saw blade appeared two resonant frequencies for the same nodal number. Keywords: harmonic method, resonant frequencies, circular saw blades.
5
Content available remote Experiment planning and evaluation of the outcomes
Javorek L., Kučerová M.
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
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2014
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No. 87
84--89
EN
The paper discusses the process of experiment planning as well as the usage of the method known as design of experiments. The principles of experiment planning were applied by the authors when machining for two-factors and two-lewels experiment. Variables were depth of cut, cutting speed, constants were sample of wood and feedspeed.
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