Автор: Васил Власев
- 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
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.
Ключови думи: wood shapers, modeling, torsional vibrations
- STUDY OF STATIC STRENGTH OF A MILLING WOODWORKING MACHINE SPINDLE BY FEM
A static analysis of a milling spindle with two bearing supports from five-operating woodworking machine KP400 with lower position and console V-belt pulley is carried out by the method of finite elements (FEM) with program Cosmos WorksÒ. The milling spindle 3D model is generated with Solid WorksÒ with all elements of the real spindle – key-slot, grooves for clip ring, tread for fixing of the cutter, segments, chamfers, filets, etc. Von Mises stresses, equivalent strains, resultant displacements, stress intensities (P1 – P3) and factor of safety distribution is obtained and visualized. A decrease of the spindle inter-support distance is offered which brings about to reduction of stresses, strains, displacements, as well as to increase of the minimum factor of safety and will give opportunity to increase the vertical motion at spindle adjustment for this type of construction of the cutting mechanism.
Ключови думи: spindle, milling woodworking machine, static analysis, FEM, Cosmos Works