Vibration and Stability of Band Saw Blades To develop models of band saw blade vibrations. The vibration of band saw blades can lead to increased sawdust generation as well as poor lumber quality and increased downtime. This research develops, experimentally validated, models of band saw blade vibrations using an axially moving plate model . Such a model allows for the inclusion of in-plane stresses as well as the transport velocity. The in-plane stress problem, due to pre-tensioning, loads and thermal effects, is first solved. These stresses are then used in the vibration analysis to obtain accurate transverse and tensional vibration natural frequencies. Experimental results from laboratory tests were used to confirm the model predictions for blade natural frequencies versus transport velocity, and blade tension. As shown in the figure below, non-contacting vibration measurements were made on actual saw blades under various operating conditions. Figure: Experimental Setup for Band Saw Blade Vibrations Axially moving plate model can account for the effects of in-plane stresses on transverse and torsion vibrations of band saw blades. In-plane stresses, due to forces or thermal effects, can also be numerically obtained. Model was experimentally validated. Vibration and Stability of Band Saw Blades To develop models of band saw blade vibrations. The vibration of band saw blades can lead to increased sawdust generation as well as poor lumber quality and increased downtime. This research develops, experimentally validated, models of band saw blade vibrations using an axially moving plate model . Such a model allows for the inclusion of in-plane stresses as well as the transport velocity. The in-plane stress problem, due to pre-tensioning, loads and thermal effects, is first solved. These stresses are then used in the vibration analysis to obtain accurate transverse and torsion vibration natural frequencies. Experimental results from laboratory tests were used to confirm the model predictions for blade natural frequencies versus transport velocity, and blade tension. As shown in the figure below, non-contacting vibration measurements were made on actual saw blades under various operating conditions. Figure: Experimental Setup for Band Saw Blade Vibrations Axially moving plate model can account for the effects of in-plane stresses on transverse and tensional vibrations of band saw blades. In-plane stresses, due to forces or thermal effects, can also be numerically obtained. The model can be solved by either finite element or Ritz/ Galerkin type methods. Vibration and Stability of Band Saw Blades To develop models of band saw blade vibrations. The vibration of band saw blades can lead to increased sawdust generation as well as poor lumber quality and increased downtime. This research develops, experimentally validated, models of band saw blade vibrations using an axially moving plate model . Such a model allows for the inclusion of in-plane stresses as well as the transport velocity. The in-plane stress problem, due to pre-tensioning, loads and thermal effects, is first solved. These stresses are then used in the vibration analysis to obtain accurate transverse and torsion vibration natural frequencies. Experimental results from laboratory tests were used to confirm the model predictions for blade natural frequencies versus transport velocity, and blade tension. As shown in the figure below, non-contacting vibration measurements were made on
Figure: Experimental Setup for Band Saw Blade Vibrations Axially moving plate model can account for the effects of in-plane stresses on transverse and tensional vibrations of band saw blades. In-plane stresses, due to forces or thermal effects, can also be numerically obtained. The model can be solved by either finite element or Ritz/Gallery type methods. Model was experimentally validated.S5.04-08 Saw milling and Machining Poster 283: Lateral Movement of the Band Saw Blade and Machine's Own Resistance Power in Relation to the Strain Force In attempting to improve the band saw efficiency there is always the problem of the lateral movement of the band saw blade and of the losses due to the machine's own resistance's. The lateral movement of the band saw blade reduces both the quality of the saw surfaces, and the material yield. At the same time it requires higher energy standards. The energy losses occurring in the machine during transmission movement also increase the specific energy standards. The lateral movement of the band saw blade and the machine's own resistance's are significantly influenced by the strain force of the blade. Both, the references and the band saw producers, list a rather wide range of strain force values. In order to determine the optimum strain force value for the given machine-tool system, a very comprehensive research work was done at the Faculty of Forestry, The strain force and the rotation frequency of the driving wheel were chosen as independent variables. The approximate value of the strain force was determined by the horizontal force and the lateral displacement of the blade. The rotation frequency of the driving wheel was varied by frequency transformer. The lateral displacement value of the band saw blade was measured by inductive transducer. The machine's own resistance's power was measured by electric measuring instruments. The research yielded very interesting results. Some of the results obtained were expected, others came as a surprise. On the whole, the research will contribute to the more objective determination of the strain force of the band saw blade, which is one of the most important parameters of the band saw efficiency. Key words: band saw efficiency, blade lateral movement, machine's own resistance power, strain force. Faculty of Forest