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Research on the effect of yield strength of circular saw blade on roll tensioning
process
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In this paper, a 2-D and 3-D finite element model of roll tensioning process of <a
href="http://www.haic-tools.com/woodworking-saw-blade/" target="_self">woodworking saw
blade</a> were established by Static/General module of ABAQUS software based on finite
element method. The rolling force and tensioning stress distribution of circular saw
blade were calculated by these two models which were proved to be true and reliable.
The effects of yield strength of circular saw blade on tensioning stress distribution
and rolling force were studied. The research achievements showed that a circular saw
blade made with high yield strength obtained a higher tangential compressive stress
and radial compressive stress in the rolled region during roll tensioning process,
which has both advantages and disadvantages for the stability of the saw blade.
Besides, a circular saw blade made with high yield strength also put forward higher
requirements for roll tensioning equipment because of the large rolling force during
roll tensioning process.
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Circular saw blade is an important tool and is widely used in wood industry. Its
stability, cutting precision, and material-saving ability are the most important
features, especially for wood processing industry because of the shortage of precious
wood. The Chinese government strongly supports the improvement of timber utilization.
Therefore, <a href="http://www.haic-tools.com/woodworking-saw-blade/tct-saw-blade-
for-wood/" target="_self">TCT saw blade for wood </a>is becoming thinner and thinner
currently for reducing kerf loss and improving the utilization of materials.
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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 [1, 2]. Thin <a href="http://www.haic-
tools.com/woodworking-saw-blade/tct-saw-blade-for-wood-composite/" target="_self">TCT
saw blade for wood composite</a> is more easily affected by thermal stress. For saving
materials, the stability of saw blade is very important, especially for thin circular
saw blade.
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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 [3–5]. 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.
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At present, the effects of tensioning on the dynamic stability of the blades have
been mainly focused [6–16]. 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 [2]. A model for roll
tensioning process was established by Nicoletti based on the finite element method
[17]. A finite element model (FEM) for roll tensioning process, which allowed for the
investigation of various roll tensioning parameters, was developed by Heisel [18]. 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 [19].
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