THE EFFECT OF ROLL-TENSIONING ON BANDSAW PLATE VIBRATION AND STABILITY

Residual membrane stresses are purposely induced in wide bandsaw plate s through a localized cold rolling procedure, known as roll-tensioning , to improve the cutting performance of the blade. Despite the critica l importance of this practice to efficient cutting operation with a ba ndsaw, quantitative understanding of roll-tensioning on bandsaw cuttin g performance remains unresolved. In this paper, the effect of roll-te nsioning on bandsaw plate free vibration and plate stability are discu ssed. The residual stresses induced by roll-tensioning can substantial ly increase or decrease the transverse and torsional natural frequenci es (or stiffnesses) of the bandsaw plate depending on the locations of the rolling tracks, the roller load and the number of rolling repetit ions on each track. With roll-tensioning that results in a substantial increase of torsional natural frequencies (or stiffnesses) and modera te decrease of transverse natural frequencies (or stiffnesses), the ba ndsaw plate can resist a larger normal edge (cutting) force prior to b uckling. Improper tensioning that decreases substantially the transver se natural frequencies, or both the transverse and torsional natural f requencies, can reduce the normal edge force at buckling.