Dynamic Behaviour Analysis of a Commercial Roll-Tensioned Circular Sawblade

Abstract

A commercial woodcutting circular sawblade was analysed in this work. The lateral stiffness on the periphery was measured, and the natural frequencies were determined by modal analyses. The sawblade was modelled by the finite element method, where the influence of the internal stresses caused by roll-tensioning of the sawblade was considered. The roll-tensioning force was determined based on the measurement of the sawblade rolling profile, where it was established that the sawblade had been rolled with a force of 7800 N. The analysis showed that at the aforementioned force, the lateral stiffness was a maximum; here, the calculated and measured stiffnesses were 81 and 60 N/mm, respectively. The calculated natural frequencies agree well with the measured ones, where in the most important vibrational modes there is only a 7% difference. The maximum rotational speed for the sawblade was determined to be 85% of the critical speed. Because the sawblade was clamped with a ratio of clamping of only 0.25, the maximum rotational speed was amounted to 6630 rpm. Increasing the rolling force would increase the critical speed but greatly reduce the lateral stiffness.

Research on residual stress field control mechanism of circular saw blade considering its body structure

“…A three-dimensional (3D) roll tensioning elastoplastic model was built by finite element method, which referred to the previous research results. [8][9][10] Previous studies had proved the accuracy of finite element method. The 3D model was shown in Figure 2 and the roll was analytical rigid body.…”

“…Szymani and Mote 5,6 built a theoretical model for roll tensioning process and got the residual stress of saw blade body. A finite element model for roll tensioning process was established by Nicoletti et al, 7 Heisel et al, 8 and Merhar et al 9 The influence of material properties of saw blade body on residual stress field of roll tensioned saw blade body was studied by Li and Zhang 10 based on finite element method (FEM). Generation and regulation mechanism of residual stress field of circular saw blade after multi-spot pressure tensioning was analyzed by Li et al [11][12][13] Theoretical analysis model of laser shock tensioning process was built by Li and Zhang [14][15][16] based on laser shock wave theory.…”

Strategy of numerical modelling for band saw blade on wood logs cutting

“…On a normal working situation (cutting operational process), the tool is susceptible to different type mechanical requests. These requests which are generally, of torsion and of heating due to friction, have its origin from the rotational blade movement when in contact to the wood [4], which are caused by the advance of the wood in the cutting operation.…”