Author: Georgi Kovachev
Articles
- INVESTIGATIONS OF THE FORCED TORSIONAL VIBRATIONS IN THE SAW UNIT OF A KIND OF WOOD SHAPERS, USED IN THE WOOD PRODUCTION
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Summary
The proposed study presents a numerical investigation of the forced torsional vibrations in the wood shaper’s saw unit caused by the variable moments on the drive electric motor and the wood shaper’s saw. The influence on the vibrations of the blades’ number of the saw, which really work, is investigated. This research is done on the base of a concrete mechanic-mathematical model for investigation of the torsional vibrations of a wood shaper’s saw developed by the authors. The main features in the construction of this kind of wood shapers are rendered an account in this model. The investigation`s results can be used as a base for making some concrete and well-founded recommendations concerning the operation of these machines. These recommendations are important for increase of reliability of the wood shapers as well as the accuracy and quality of their production.
Keywords: wood shapers, modeling, torsional vibrations
- NUMERICAL INVESTIGATIONS OF THE NATURAL FREQUENCIES AND MODE SHAPES OF THE TORSIONAL VIBRATIONS IN THE SAW UNIT OF A KIND OF WOOD SHAPERS, USED IN THE WOOD PRODUCTION
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Summary
Some numerical investigations of the natural frequencies and mode shapes of the wood shaper’s saw unit are presented in this study. These researches are done on the base of a concrete mechanic-mathematical model for investigation of free torsional vibrations of a wood shaper’s saw developed by the authors. The main features in the construction of these kind wood shapers are rendered an account of this model. The two most commonly used driving mechanisms are modeled – with a wedge belt and with a ribbed belt. The studies allow a comparison of the vibration behavior of the mechanism for both drives. The results of this study allow the determination of the resonant work regimes. The exactly determination of these regimes is important for introduction of adequate measures which can guarantee their using. The investigation`s results can be used as a base for making some recommendations concerning the increase of reliability of the wood shapers as well as the accuracy and quality of their production.
Keywords: wood shapers, modeling, torsional vibrations
- TRENDS FOR APPLICATION OF THE WEDGE AND RIBBED BELTS IN MODERN WOODWORKING MACHINЕRY
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Summary
The current paper makes an overview of trends in the use of V-belts and ribbed belts in modern woodworking machines. Driving of different types of mechanisms in machines is most often accomplished by using belt drives. They have many advantages and some of the most important are: simple construction, quiet operation, large towing capacity, the possibility of simultaneous operation of several belts and further more. Widely spreads are both the V-belts and ribbed belts. Improved construction and use of high quality materials for their production leads to betterment their performance.
Keywords: woodworking machines, V-belts, ribbed belts