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1
Content available Vibration reduction on circular saw blades with vibroacoustic metamaterials
Rieß Sebastian, Kaal William, Herold Sven
Bulletin of the Polish Academy of Sciences. Technical Sciences
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2023
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Vol. 71, nr 6
art. no. e147921
EN
The presented work focuses on the experimental investigation of a vibroacoustic metamaterial integrated into a spinning circular saw blade. Vibroacoustic metamaterials are a novel technology for broadband vibration reduction. Built from an array of local resonators, a broadband vibration reduction characteristic in the frequency domain (a so-called stop band) can be achieved. A design of a vibroacoustic metamaterial suitable for integration into a circular saw blade is developed and a numerical stop band prediction is performed. The resonators of the vibroacoustic metamaterial are integrated into the saw blade with a water jet cutting machine to create slots, forming flaps that are free to oscillate. The structural dynamic behavior of the saw blade with integrated vibroacoustic metamaterial is experimentally investigated on a rotor dynamic test bench and compared to that of a standard saw blade. The saw blades are excited by an automatic impulse hammer and the resulting out-of-plane vibrations are measured with a laser vibrometer at two different radii. Measurements are conducted at different rotational speeds up to 1800 rpm. Up to rotational speeds of 1000 rpm a stop band characteristic in the frequency range of 1900–2500 Hz is observed.
2
Content available Prototyp przecinarki z frezem tarczowo-piłkowym mocowanym od spodu przedmiotu obrabianego
Gustowski Tomasz, Kurek Waldemar, Samsonik Krystian, Grzejda Rafał
Systemy Wspomagania w Inżynierii Produkcji
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2022
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Vol. 11, iss. 2
57--65
PL
W artykule przedstawiono prototyp przecinarki tarczowej z narzędziem mocowanym od spodu przedmiotu obrabianego. Układ przeznaczony jest do obróbki długich profili liniowych stosowanych w stalowych konstrukcjach inżynierskich. Umożliwia cięcie profili o zamkniętych lub otwartych przekrojach poprzecznych na zadany wymiar. Układ jest częścią innowacyjnej linii technologicznej do automatycznego cięcia plazmowego, cięcia frezem tarczowo-piłkowym oraz spawania z wykorzystaniem robotów spawalniczych.
EN
In the paper, a prototype of a circular saw with a tool fixed from the bottom of the workpiece is introduced. The system is intended for the processing of long linear profiles used in engineering steel structures. It enables cutting profiles with closed or open cross-sections to a given size. The system is part of an innovative technological line for automatic plasma cutting, circular saw cutting and welding with use of welding robots.
3
Content available Effect of thermal modification temperature of spruce wood on cutting parameters during circular saw blade cutting
Hlásková Luďka, Kopecký Zdeněk, Novák Vit
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
|
2021
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No. 113
30--35
EN
Effect of thermal modification temperature of spruce wood on cutting parameters during circular saw blade cutting. The work examines the effect of temperature on energetical parameters (specific cutting resistance and cutting force) when cutting heat-treated wood of Norway spruce (Picea Abies) by a circular saw. The test samples were heat-treated at 160°C, 180°C, 200°C and 220°C. One sample was not heat treated and was used as a reference sample. In comparison with the theoretical assumptions, the influence of temperature on the cutting force and specific cutting resistance was confirmed. With increasing temperature of modification, the specific cutting resistance and cutting force decreased. The reduction of value of cutting force is related to changes in the chemical structure of the wood components, weight and density loss due to the increasing temperature of modification.
PL
Wpływ temperatury modyfikacji termicznej drewna świerkowego na parametry skrawania podczas cięcia piłą tarczową. W pracy zbadano wpływ temperatury modyfikacji na parametry skrawania (oprór skrawania i siła skrawania) przy cięciu piłą tarczową drewna świerka pospolitego (Picea Abies) poddanego obróbce termicznej. Próbki drewna do badań poddano obróbce w temperaturze 160°C, 180°C, 200°C i 220°C. Jako wariant kontrolny wykorzystano drewno naturalne (nie poddane obróbce termicznej). W ramach badan potwierdzono wpływ temperatury modyfikacji na siłę skrawania i opory skrawania drewna. Wraz ze wzrostem temperatury modyfikacji zmniejszały się wartosci oporu skrawania i siły skrawania. Zmniejszenie wartości siły skrawania związane jest ze zmianami struktury chemicznej składników drewna, ubytkiem masy i gęstości pod wpływem wzrostu temperatury modyfikacji.
4
Content available Machine vision detection of the circular saw vibrations
Sandak J., Orlowski K. A.
Journal of Machine Engineering
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2018
|
Vol. 18, No. 3
67--77
EN
Dynamical properties of rotating circular saw blades are crucial for both production quality and personnel safety. This paper presents a novel method for monitoring circular saw vibrations and deviations. A machine vision system uses a camera and a laser line projected on the saw’s surface to estimate vibration range. Changes of the dynamic behaviour of the saw were measured as a function of the rotational speed. The critical rotational speed of the circular saw blade as well as the optimal rotational speed of the saw were detected.
5
Content available remote Niejednoznaczność diagnostyczna testu impulsowego w badaniach empirycznych pił tarczowych do drewna
Orłowski K. A., Kaczmarek A.
Mechanik
|
2016
|
R. 89, nr 8-9
1114--1115
PL
Zachowanie piły podczas pracy – zarówno w trakcie przecinania, jak i na biegu luzem – zależy w dużym stopniu od konstrukcji piły i częstotliwości własnych narzędzi, które można określać doświadczalnie za pomocą testu harmonicznego bądź impulsowego. Wyniki badań wykazały, że ten ostatni nie gwarantuje prawidłowego przypisania częstotliwości charakterystycznych widma do odpowiadających im rzeczywistych postaci drgań wynikającym z testu harmonicznego.
EN
Behavior of the saw blade during cutting and also in idling is affected by a tool design and its natural frequencies. The latter could be determined experimentally either in harmonic or impact tests. The obtained results revealed that the impact test does not guarantee the proper way to attribute characteristic frequencies in the spectra to the real modes of vibrations obtained in the harmonic test.
6
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
|
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.
7
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
|
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.
8
Content available Content of respirable and inhalable fractions in dust created at sawing beech wood and its modifications
Hlásková L., Rogoziński T., Dolny S., Kopecký Z., Jedinák M.
Drewno : prace naukowe, doniesienia, komunikaty
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2015
|
vol. 58, nr 194
135--146
EN
This paper presents the results of the granulometric analysis of sawdust, created during the sawing of modified and unmodified beech wood with a circular saw. The aim of this work was to analyze the effect of the treatment of beech wood (Fagus sylvatica L.) on the content of respirable and inhalable particles in sawdust generated during the sawing process using a modern circular saw. Different methods of particle-size determination were used. The results obtained from the sieve analysis prove that the sawdust created during the cutting of DMDHEU was finer than the sawdust from native beech and other modified materials. It was also discovered that the dust created during the cutting of Bendywood was finer than when machining native beech and Lignamon. There was an increase in the share of fine fraction in the range of granularity x < 100 μm at the expense of the fraction x = 0.25–1 mm. The properties of Lignamon are primarily based on the properties of raw wood material, therefore this modified material had a similar cumulative particle-size distribution to the native beech dust.
9
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
|
2014
|
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.
10
Content available remote Laserowy pomiar bicia i płaskości dysków pił tarczowych
Reiner J., Mrzygłód M., Tryba D.
Napędy i Sterowanie
|
2008
|
R. 10, nr 6
39-42
PL
Proces cięcia za pomocą pił tarczowych wymaga dużych prędkości obrotowych narzędzia, w wyniku których jest ono poddawane zmiennym warunkom, które wynikają z występowania sił pomiędzy zębami a ciętym materiałem. Siły te mogą być dużo większe przy braku płaskości piły. Już przy najmniejszym wychyleniu powstaje moment siły uginający tarczę. Moment ten będzie wzrastał wraz z głębokością cięcia. Rezultatem ugięcia jest zbaczanie tarczy z prawidłowej linii cięcia, tarcie o powierzchnię materiału powodujące nagrzewanie tarczy, wpływające ujemnie na jej trwałość.
EN
Cutting process with the use of circular saw requires high rotational speed of tool, which results in variable conditions of tool operation due to the forces between saw teeth and material cut. These forces can be much greater when lack of flatness and saw whipping occur, and thus causing creation of moment of force which bends the saw-blade disk. As a result of deflection the disk deviates from the proper cutting line, the friction between the disk and material arise causing disk heating which reduces its durability. Therefore it is essential to ensure the whipping values and disk flatness deviations to be as low as possible. The article covers the method of flatness and whipping measurement, consisting in rotating disk surface scanning with the use of laser micro-displacement detectors located on the linear drive.
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