Natural Frequencies of Roll-Tensioned Circular Sawblades: Effects of Roller Loads, Number of Grooves, and Groove Positions

Abstract

Roll-tensioning effects on natural frequencies in circular sawblades for woodcutting were investigated. Adequate knowledge of these effects will enable a more precise and repeatable tuning of natural frequencies, which will ease manufacturing and maintenance of sawblades. With natural frequencies tuned to not create resonance under running conditions, longer running times and more accurate cutting are made easier. The aim of this study was to find the optimum, or most suitable, tensioning parameters for a series of tested circular sawblades and also to draw general conclusions. The effects of the magnitude of the roller load, number of grooves, and groove positions were tested. The magnitude of the roller load was measured by using a universal load cell. The roll-tensioning effects were evaluated by measuring the shift in natural frequencies of several vibration modes. Finite element analysis was performed to model natural frequencies. The magnitude of the roller load, number of grooves, and groove positions all affected the natural frequencies. Natural frequencies obtained with the finite element method were in good agreement with the experimental test results.

On the influence of thermal stresses on eigenvalues of a circular saw blade

“…A further extension to the unsymmetrical temperature field with the heat input in a point was presented in literature. 11 The link between stresses introduced by the blade tensioning and thermal stresses is further manifested in a recent paper, 12 where the tensioning effect is modelled by the artificial temperature field in a finite element simulation. Clearly, tensioning introduced either by mechanical or thermal means has the same outcome.…”

“…In this research, the analytical approach is abandoned in favour of the finite element model. The advantages of the approach were already used before 12,20 but in the isothermal context. This also means abandoning of all previously mentioned assumptions and simplifications.…”

Dynamic Behaviour Analysis of a Commercial Roll-Tensioned Circular Sawblade

“…In more recent times, with the emerging of the finite element method, many new designs of circular sawblades have been developed (Yuan 2012;Wasielewski et al 2012;Droba et al 2015;Kaczmarek et al 2016a), and the influence of the rolling and geometrical parameters on dynamic behaviour has been calculated (Cristovao et al 2012;Heisel et al 2015;Li et al 2016). Many new methods have also been developed for the verification of dynamic behaviour (Orlowski et al 2007;Vesely et al 2012;Kaczmarek et al 2016b;Skoblar et al 2016).…”

Research on the effect of yield strength of circular saw blade on roll tensioning process

“…At present, the effects of tensioning on the dynamic stability of the blades have been mainly focused [6][7][8][9][10][11][12][13][14][15][16]. The generation of tensioning stress during tensioning processes has been studied by a few researchers.…”