process
In this paper, a 2-D and 3-D finite element model of roll tensioning process of
woodworking saw blade 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.
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, TCT saw blade for wood is becoming thinner and thinner currently for
reducing kerf loss and improving the utilization of materials.
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 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 [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.
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].
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.
In step 1, the roll moved slowly down and elastic–plastic deformation was
produced to the metal cutting
saw blade. In step 2, the roll slowly raised and the saw blade was no longer
under any load. The residual stress of saw blade was the tensioning stress.
A vertical displacement constraint was applied to the axial center plane. The 4
node axially symmetrical reduced integral element CAX4R was chosen for the circular
saw blade. The number of elements was increased within the contact area between the
circular saw blade and the roll for improving the accuracy of calculation, as shown in
Fig. 1. The roll was modeled as an analytical rigid body because the deformation of
roll is not the focus of this paper, which can also improve the calculation
efficiency. Vertical downward displacement was applied to the roll. Coulomb friction
model was applied between the circular saw blade and the roll. The friction
coefficient was set to 0.1.
The material model of circular saw blade was set as linear strengthening elastic–
plastic model (bilinear model) because the plastic deformation of circular saw blade
during roll tensioning process was very little. Its Elastic modulus and Poisson ratio
were 210 GPa and 0.3.
The dimension of circular saw blade was shown below. The diameter was 360 mm; the
thickness was 2.2 mm; and the diameter of the hole was 60 mm. The dent depth of rolled
region was 10 μm. The radius of rolled region was 105 mm.
3-D FEM model for calculation of rolling force
A half model was established considering the symmetry of the model by
Static/General Module of ABAQUS, as shown in Fig. 2. The 3-D FEM model was used to
calculate rolling force, because it can truly reflect the contact status between the
roll and the saw blade. Taking into account its efficiency, the roll in the 3-D FEM
model only needs to rotate a small angle, with the rolling force reaching a steady
state. The dimension of roll was shown in Fig. 3. Its radius was 30 mm.
In step 1, the roll moved slowly down and elastic–plastic deformation was
produced to the saw blade. In step 2, the roll began to rotate and the rotation of the
roll drove the saw blade to rotate. The vertical force acting on the roll calculated
by the model was the rolling force.
The three-dimensional 8 node reduced integral element C3D8R was chosen for the
rolling ring of circular saw blade for metal and the 4-node general-purpose
reduced integral shell S4R was chosen for the medial and lateral regions, which can
reduce the number of elements to the maximum extent and improve the computational
efficiency. The three parts were tied together through the way of shell-to-solid
coupling. The number of elements was increased within the contact area between the
circular saw blade and the roll for improving the accuracy of calculation, as shown in
Fig. 3. The other parameters of the 3-D FEM model were the same as the 2-D model.
Roll tensioning experiment was done. Parameters of circular saw blade were shown
below: material, 65 Mn; hardness, HRC42; yield strength, 430 MPa; strain hardening
rate, 1000 MPa. Parameters of the roll were shown below: hardness, HRC60. The other
parameters of the saw blade and the roll were the same as the FEM model. The dent
depth of rolled region was 10 μm and tensioning stress distribution along the radial
direction of upper surface in circular saw blade was measured by X-ray stress meter.
The vertical downward displacement applied to the roll in the 2-D FEM model was
adjusted for making the depth of rolled region to be 10 μm, and the tensioning stress
of nodes along the radial direction of upper surface in circular saw blade was
obtained. The contrast between the tensioning stress of the circular saw blade
calculated by the FEM model and the measured results in the radial path was shown in
Fig. 4.
As shown in Fig. 4, the tensioning stress distribution of the circular saw blade
calculated by the FEM model followed the same trend as previous research results [2,
6, 18]. The values of tensioning stress of the circular saw blade calculated by the
FEM model and the measured results in radial path of the circular saw blade were
similar in most regions. The results mentioned above demonstrated that the tensioning
stress of the circular saw blade calculated by the model in this paper was true and
reliable. The tensioning stress distribution of circular saw blade after roll
tensioning process was the key analysis object in the following.
As shown in Fig. 5, the rolling force increased slowly during pressing process of
roll. The rolling force reached a steady state during rolling process. As shown in
Fig. 6a, the rolling force was increased with the vertical downward displacement of
the roll. Elastic–plastic deformation was produced in the contact region of circular
saw blade. To obtain the dent depth 10 μm of rolled region, the vertical downward
displacement applied to the roll was 13.4 μm because of the rebound deformation of
circular saw blade. As shown in Fig. 6b, the rolling force was about 8000 N and was
not changed approximately with the rotation angle of the roll during rolling process.
The elastic–plastic deformation was produced in ring rolling region during this
process. The calculation result of rolling force was in conformity with the actual
situation. Rolling force of steady state was the object of analysis in the following
too.
For tangential tensioning stress, the tangential tensioning stress difference
between outer edge of the saw blade and rolled region was increased with yield
strength when circular saw blade was under the same deformation, which meant that the
tensioning effect was improved with the increase of yield strength, because the
greater tangential tensioning stress difference between edge of the saw blade and
rolled region meant that the circular saw blade could maintain stability during large
temperature differences when it was at work.
However, for radial tensioning stress, the radial tensioning stress difference
between inner edge of the saw blade and rolled region was increased with yield
strength when circular saw blade was under the same deformation, which was not
conducive to the improvement of the stability of the saw blade because the stress
state is easy for the blade to lose stability and buckle into a “dish” shape.
As shown in Fig. 8, rolling force was increased linearly with yield strength of
circular saw blade when dent depth of rolled region is 10 μm because plastic
deformation resistance was increased with yield strength. When yield strength of
circular saw blade was 1200 MPa, the rolling force had reached to 19.2 kN. The
substantial increase in rolling force brought challenges to the roll tensioning
equipment of cermet saw blade.
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