The Effect Of Roll-tensioning On Bandsaw Plate Vibration And Stability

Abstract

Residual membrane stresses are purposely induced in wide bandsaw plates through a localized cold rolling procedure, known as roll-tensioning, to improve the cutting performance of the blade. Despite the critical importance of this practice to efficient cutting operation with a bandsaw, quantitative understanding of roll-tensioning on bandsaw cutting performance remains unresolved. In this paper, the effect of roll-tensioning on bandsaw plate free vibration and plate stability are discussed. The residual stresses induced by roll-tensioning can substantially increase or decrease the transverse and torsional natural frequencies (or stiffnesses) of the bandsaw plate depending on the locations of the rolling tracks, the roller load and the number of rolling repetitions on each track. With roll-tensioning that results in a substantial increase of torsional natural frequencies (or stiffnesses) and moderate decrease of transverse natural frequencies (or stiffnesses), the bandsaw plate can resist a larger normal edge (cutting) force prior to buckling. Improper tensioning that decreases substantially the transverse natural frequencies, or both the transverse and torsional natural frequencies, can reduce the normal edge force at buckling.