Attività

However, thermal stress is produced when circular saw blade is working, because the temperature at the edge of the blade is higher than that in other regions of the blade. It will cause high tangential compressive stress on the edge of the circular saw blade, causing a buckling deformation that reduces cutting precision, increases kerf loss, and shortens the saw’s life . Thin TCT saw blade for wood composite is more easily affected by thermal stress. For saving materials, the stability of saw blade is very important, especially for thin circular saw blade.

Tensioning is the most important and advanced technological process for production of circular saw blade for avoiding the above-mentioned phenomenon. Among all the tensioning processes, roll tensioning process is most widely applied in the cutting tool industry. The tangential tensile tensioning stress field is produced which can compensate for the tangential compressive stress caused by thermal stress and improve the stability of circular saw blade . However, circular saw blade can also obtain radial compressive tensioning stress during roll tensioning process which is easy for the blade to lose stability and buckle into a “dish” shape. The thin circular saw blade requires higher tangential tensile tensioning stress and lower radial compressive tensioning stress for maintaining stability, which brings a challenge to roll tensioning process of thin circular saw blade.

At present, the effects of tensioning on the dynamic stability of the blades have been mainly focused . The generation of tensioning stress during tensioning processes has been studied by a few researchers. A theoretical model for roll tensioning process was established by Szymani and Mote . A model for roll tensioning process was established by Nicoletti based on the finite element method . A finite element model (FEM) for roll tensioning process, which allowed for the investigation of various roll tensioning parameters, was developed by Heisel . A mathematical model of tangential tensioning stress in the edge of a circular saw blade tensioned by multi-spot pressure was established for the quality control of circular saw blades by Li .

Yield strength is the lowest stress value when plastic deformation is produced, which is an important indicator for metal materials and has a great effect on metal forming process such as roll tensioning process. Circular saw blade with different yield strength could obtain tangential tensile and radial compressive tensioning stress with different values, and different rolling force will be applied to the roll for making the blade to produce plastic deformation.

However, to date, for circular saw blades, there is no related research about the effect of yield strength on the generation of tensioning stress during roll tensioning process. Therefore, the effect of yield strength of circular saw blade on the generation of tensioning stress during roll tensioning process was analyzed in this paper, which can demonstrate the effect of yield strength on roll tensioning process.